X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=gdb%2Fs390-tdep.c;h=b309524b69006310fd7fb451312a7b74284016ca;hb=55f960e1d2e58215a0c274e8d30e6036c96a2959;hp=f3810a8817bc1dff1d82b90f330fab3f6e964169;hpb=b46e02f67c909205abc6b82e963bfd46cabcea4f;p=binutils-gdb.git
diff --git a/gdb/s390-tdep.c b/gdb/s390-tdep.c
index f3810a8817b..b309524b690 100644
--- a/gdb/s390-tdep.c
+++ b/gdb/s390-tdep.c
@@ -1,6 +1,7 @@
/* Target-dependent code for GDB, the GNU debugger.
- Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+ Free Software Foundation, Inc.
Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
for IBM Deutschland Entwicklung GmbH, IBM Corporation.
@@ -9,7 +10,7 @@
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
@@ -18,12 +19,9 @@
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA. */
+ along with this program. If not, see . */
-#define S390_TDEP /* for special macros in tm-s390.h */
-#include
+#include "defs.h"
#include "arch-utils.h"
#include "frame.h"
#include "inferior.h"
@@ -31,1235 +29,1736 @@
#include "target.h"
#include "gdbcore.h"
#include "gdbcmd.h"
-#include "symfile.h"
#include "objfiles.h"
-#include "tm.h"
-#include "../bfd/bfd.h"
#include "floatformat.h"
#include "regcache.h"
+#include "trad-frame.h"
+#include "frame-base.h"
+#include "frame-unwind.h"
+#include "dwarf2-frame.h"
+#include "reggroups.h"
+#include "regset.h"
#include "value.h"
#include "gdb_assert.h"
+#include "dis-asm.h"
+#include "solib-svr4.h"
+#include "prologue-value.h"
+#include "s390-tdep.h"
+/* The tdep structure. */
-/* Number of bytes of storage in the actual machine representation
- for register N. */
-int
-s390_register_raw_size (int reg_nr)
+struct gdbarch_tdep
{
- if (S390_FP0_REGNUM <= reg_nr
- && reg_nr < S390_FP0_REGNUM + S390_NUM_FPRS)
- return S390_FPR_SIZE;
- else
- return 4;
-}
+ /* ABI version. */
+ enum { ABI_LINUX_S390, ABI_LINUX_ZSERIES } abi;
-int
-s390x_register_raw_size (int reg_nr)
+ /* Core file register sets. */
+ const struct regset *gregset;
+ int sizeof_gregset;
+
+ const struct regset *fpregset;
+ int sizeof_fpregset;
+};
+
+
+/* Return the name of register REGNUM. */
+static const char *
+s390_register_name (struct gdbarch *gdbarch, int regnum)
{
- return (reg_nr == S390_FPC_REGNUM)
- || (reg_nr >= S390_FIRST_ACR && reg_nr <= S390_LAST_ACR) ? 4 : 8;
+ static const char *register_names[S390_NUM_TOTAL_REGS] =
+ {
+ /* Program Status Word. */
+ "pswm", "pswa",
+ /* General Purpose Registers. */
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
+ /* Access Registers. */
+ "acr0", "acr1", "acr2", "acr3", "acr4", "acr5", "acr6", "acr7",
+ "acr8", "acr9", "acr10", "acr11", "acr12", "acr13", "acr14", "acr15",
+ /* Floating Point Control Word. */
+ "fpc",
+ /* Floating Point Registers. */
+ "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
+ "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
+ /* Pseudo registers. */
+ "pc", "cc",
+ };
+
+ gdb_assert (regnum >= 0 && regnum < S390_NUM_TOTAL_REGS);
+ return register_names[regnum];
}
-int
-s390_cannot_fetch_register (int regno)
+/* Return the GDB type object for the "standard" data type of data in
+ register REGNUM. */
+static struct type *
+s390_register_type (struct gdbarch *gdbarch, int regnum)
{
- return (regno >= S390_FIRST_CR && regno < (S390_FIRST_CR + 9)) ||
- (regno >= (S390_FIRST_CR + 12) && regno <= S390_LAST_CR);
+ if (regnum == S390_PSWM_REGNUM || regnum == S390_PSWA_REGNUM)
+ return builtin_type (gdbarch)->builtin_long;
+ if (regnum >= S390_R0_REGNUM && regnum <= S390_R15_REGNUM)
+ return builtin_type (gdbarch)->builtin_long;
+ if (regnum >= S390_A0_REGNUM && regnum <= S390_A15_REGNUM)
+ return builtin_type (gdbarch)->builtin_int;
+ if (regnum == S390_FPC_REGNUM)
+ return builtin_type (gdbarch)->builtin_int;
+ if (regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM)
+ return builtin_type (gdbarch)->builtin_double;
+ if (regnum == S390_PC_REGNUM)
+ return builtin_type (gdbarch)->builtin_func_ptr;
+ if (regnum == S390_CC_REGNUM)
+ return builtin_type (gdbarch)->builtin_int;
+
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
}
-int
-s390_register_byte (int reg_nr)
+/* DWARF Register Mapping. */
+
+static int s390_dwarf_regmap[] =
{
- if (reg_nr <= S390_GP_LAST_REGNUM)
- return reg_nr * S390_GPR_SIZE;
- if (reg_nr <= S390_LAST_ACR)
- return S390_ACR0_OFFSET + (((reg_nr) - S390_FIRST_ACR) * S390_ACR_SIZE);
- if (reg_nr <= S390_LAST_CR)
- return S390_CR0_OFFSET + (((reg_nr) - S390_FIRST_CR) * S390_CR_SIZE);
- if (reg_nr == S390_FPC_REGNUM)
- return S390_FPC_OFFSET;
- else
- return S390_FP0_OFFSET + (((reg_nr) - S390_FP0_REGNUM) * S390_FPR_SIZE);
-}
-
-#ifndef GDBSERVER
-#define S390_MAX_INSTR_SIZE (6)
-#define S390_SYSCALL_OPCODE (0x0a)
-#define S390_SYSCALL_SIZE (2)
-#define S390_SIGCONTEXT_SREGS_OFFSET (8)
-#define S390X_SIGCONTEXT_SREGS_OFFSET (8)
-#define S390_SIGREGS_FP0_OFFSET (144)
-#define S390X_SIGREGS_FP0_OFFSET (216)
-#define S390_UC_MCONTEXT_OFFSET (256)
-#define S390X_UC_MCONTEXT_OFFSET (344)
-#define S390_STACK_FRAME_OVERHEAD (GDB_TARGET_IS_ESAME ? 160:96)
-#define S390_SIGNAL_FRAMESIZE (GDB_TARGET_IS_ESAME ? 160:96)
-#define s390_NR_sigreturn 119
-#define s390_NR_rt_sigreturn 173
-
-
-
-struct frame_extra_info
-{
- int initialised;
- int good_prologue;
- CORE_ADDR function_start;
- CORE_ADDR skip_prologue_function_start;
- CORE_ADDR saved_pc_valid;
- CORE_ADDR saved_pc;
- CORE_ADDR sig_fixed_saved_pc_valid;
- CORE_ADDR sig_fixed_saved_pc;
- CORE_ADDR frame_pointer_saved_pc; /* frame pointer needed for alloca */
- CORE_ADDR stack_bought; /* amount we decrement the stack pointer by */
- CORE_ADDR sigcontext;
+ /* General Purpose Registers. */
+ S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM,
+ S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM,
+ S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM,
+ S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM,
+
+ /* Floating Point Registers. */
+ S390_F0_REGNUM, S390_F2_REGNUM, S390_F4_REGNUM, S390_F6_REGNUM,
+ S390_F1_REGNUM, S390_F3_REGNUM, S390_F5_REGNUM, S390_F7_REGNUM,
+ S390_F8_REGNUM, S390_F10_REGNUM, S390_F12_REGNUM, S390_F14_REGNUM,
+ S390_F9_REGNUM, S390_F11_REGNUM, S390_F13_REGNUM, S390_F15_REGNUM,
+
+ /* Control Registers (not mapped). */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+
+ /* Access Registers. */
+ S390_A0_REGNUM, S390_A1_REGNUM, S390_A2_REGNUM, S390_A3_REGNUM,
+ S390_A4_REGNUM, S390_A5_REGNUM, S390_A6_REGNUM, S390_A7_REGNUM,
+ S390_A8_REGNUM, S390_A9_REGNUM, S390_A10_REGNUM, S390_A11_REGNUM,
+ S390_A12_REGNUM, S390_A13_REGNUM, S390_A14_REGNUM, S390_A15_REGNUM,
+
+ /* Program Status Word. */
+ S390_PSWM_REGNUM,
+ S390_PSWA_REGNUM
};
+/* Convert DWARF register number REG to the appropriate register
+ number used by GDB. */
+static int
+s390_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
+{
+ int regnum = -1;
+
+ if (reg >= 0 && reg < ARRAY_SIZE (s390_dwarf_regmap))
+ regnum = s390_dwarf_regmap[reg];
-static CORE_ADDR s390_frame_saved_pc_nofix (struct frame_info *fi);
+ if (regnum == -1)
+ warning (_("Unmapped DWARF Register #%d encountered."), reg);
-int
-s390_readinstruction (bfd_byte instr[], CORE_ADDR at,
- struct disassemble_info *info)
+ return regnum;
+}
+
+/* Pseudo registers - PC and condition code. */
+
+static void
+s390_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, gdb_byte *buf)
{
- int instrlen;
+ ULONGEST val;
- static int s390_instrlen[] = {
- 2,
- 4,
- 4,
- 6
- };
- if ((*info->read_memory_func) (at, &instr[0], 2, info))
- return -1;
- instrlen = s390_instrlen[instr[0] >> 6];
- if (instrlen > 2)
+ switch (regnum)
{
- if ((*info->read_memory_func) (at + 2, &instr[2], instrlen - 2, info))
- return -1;
+ case S390_PC_REGNUM:
+ regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &val);
+ store_unsigned_integer (buf, 4, val & 0x7fffffff);
+ break;
+
+ case S390_CC_REGNUM:
+ regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);
+ store_unsigned_integer (buf, 4, (val >> 12) & 3);
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
}
- return instrlen;
}
static void
-s390_memset_extra_info (struct frame_extra_info *fextra_info)
+s390_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, const gdb_byte *buf)
{
- memset (fextra_info, 0, sizeof (struct frame_extra_info));
-}
+ ULONGEST val, psw;
+ switch (regnum)
+ {
+ case S390_PC_REGNUM:
+ val = extract_unsigned_integer (buf, 4);
+ regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &psw);
+ psw = (psw & 0x80000000) | (val & 0x7fffffff);
+ regcache_raw_write_unsigned (regcache, S390_PSWA_REGNUM, psw);
+ break;
+ case S390_CC_REGNUM:
+ val = extract_unsigned_integer (buf, 4);
+ regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw);
+ psw = (psw & ~((ULONGEST)3 << 12)) | ((val & 3) << 12);
+ regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, psw);
+ break;
-const char *
-s390_register_name (int reg_nr)
+ default:
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
+ }
+}
+
+static void
+s390x_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, gdb_byte *buf)
{
- static char *register_names[] = {
- "pswm", "pswa",
- "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
- "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
- "acr0", "acr1", "acr2", "acr3", "acr4", "acr5", "acr6", "acr7",
- "acr8", "acr9", "acr10", "acr11", "acr12", "acr13", "acr14", "acr15",
- "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",
- "cr8", "cr9", "cr10", "cr11", "cr12", "cr13", "cr14", "cr15",
- "fpc",
- "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
- "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15"
- };
+ ULONGEST val;
- if (reg_nr <= S390_LAST_REGNUM)
- return register_names[reg_nr];
- else
- return NULL;
+ switch (regnum)
+ {
+ case S390_PC_REGNUM:
+ regcache_raw_read (regcache, S390_PSWA_REGNUM, buf);
+ break;
+
+ case S390_CC_REGNUM:
+ regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);
+ store_unsigned_integer (buf, 4, (val >> 44) & 3);
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
+ }
}
+static void
+s390x_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, const gdb_byte *buf)
+{
+ ULONGEST val, psw;
+ switch (regnum)
+ {
+ case S390_PC_REGNUM:
+ regcache_raw_write (regcache, S390_PSWA_REGNUM, buf);
+ break;
+ case S390_CC_REGNUM:
+ val = extract_unsigned_integer (buf, 4);
+ regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw);
+ psw = (psw & ~((ULONGEST)3 << 44)) | ((val & 3) << 44);
+ regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, psw);
+ break;
-int
-s390_stab_reg_to_regnum (int regno)
+ default:
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
+ }
+}
+
+/* 'float' values are stored in the upper half of floating-point
+ registers, even though we are otherwise a big-endian platform. */
+
+static struct value *
+s390_value_from_register (struct type *type, int regnum,
+ struct frame_info *frame)
{
- return regno >= 64 ? S390_PSWM_REGNUM - 64 :
- regno >= 48 ? S390_FIRST_ACR - 48 :
- regno >= 32 ? S390_FIRST_CR - 32 :
- regno <= 15 ? (regno + 2) :
- S390_FP0_REGNUM + ((regno - 16) & 8) + (((regno - 16) & 3) << 1) +
- (((regno - 16) & 4) >> 2);
+ struct value *value = default_value_from_register (type, regnum, frame);
+ int len = TYPE_LENGTH (type);
+
+ if (regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM && len < 8)
+ set_value_offset (value, 0);
+
+ return value;
}
+/* Register groups. */
-/* Return true if REGIDX is the number of a register used to pass
- arguments, false otherwise. */
static int
-is_arg_reg (int regidx)
+s390_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
+ struct reggroup *group)
{
- return 2 <= regidx && regidx <= 6;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ /* Registers displayed via 'info regs'. */
+ if (group == general_reggroup)
+ return (regnum >= S390_R0_REGNUM && regnum <= S390_R15_REGNUM)
+ || regnum == S390_PC_REGNUM
+ || regnum == S390_CC_REGNUM;
+
+ /* Registers displayed via 'info float'. */
+ if (group == float_reggroup)
+ return (regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM)
+ || regnum == S390_FPC_REGNUM;
+
+ /* Registers that need to be saved/restored in order to
+ push or pop frames. */
+ if (group == save_reggroup || group == restore_reggroup)
+ return regnum != S390_PSWM_REGNUM && regnum != S390_PSWA_REGNUM;
+
+ return default_register_reggroup_p (gdbarch, regnum, group);
}
-/* s390_get_frame_info based on Hartmuts
- prologue definition in
- gcc-2.8.1/config/l390/linux.c
+/* Core file register sets. */
- It reads one instruction at a time & based on whether
- it looks like prologue code or not it makes a decision on
- whether the prologue is over, there are various state machines
- in the code to determine if the prologue code is possilby valid.
-
- This is done to hopefully allow the code survive minor revs of
- calling conventions.
-
- */
-
-int
-s390_get_frame_info (CORE_ADDR pc, struct frame_extra_info *fextra_info,
- struct frame_info *fi, int init_extra_info)
-{
-#define CONST_POOL_REGIDX 13
-#define GOT_REGIDX 12
- bfd_byte instr[S390_MAX_INSTR_SIZE];
- CORE_ADDR test_pc = pc, test_pc2;
- CORE_ADDR orig_sp = 0, save_reg_addr = 0, *saved_regs = NULL;
- int valid_prologue, good_prologue = 0;
- int gprs_saved[S390_NUM_GPRS];
- int fprs_saved[S390_NUM_FPRS];
- int regidx, instrlen;
- int const_pool_state;
- int varargs_state;
- int loop_cnt, gdb_gpr_store, gdb_fpr_store;
- int offset, expected_offset;
- int err = 0;
- disassemble_info info;
-
- /* Have we seen an instruction initializing the frame pointer yet?
- If we've seen an `lr %r11, %r15', then frame_pointer_found is
- non-zero, and frame_pointer_regidx == 11. Otherwise,
- frame_pointer_found is zero and frame_pointer_regidx is 15,
- indicating that we're using the stack pointer as our frame
- pointer. */
- int frame_pointer_found = 0;
- int frame_pointer_regidx = 0xf;
-
- /* What we've seen so far regarding saving the back chain link:
- 0 -- nothing yet; sp still has the same value it had at the entry
- point. Since not all functions allocate frames, this is a
- valid state for the prologue to finish in.
- 1 -- We've saved the original sp in some register other than the
- frame pointer (hard-coded to be %r11, yuck).
- save_link_regidx is the register we saved it in.
- 2 -- We've seen the initial `bras' instruction of the sequence for
- reserving more than 32k of stack:
- bras %rX, .+8
- .long N
- s %r15, 0(%rX)
- where %rX is not the constant pool register.
- subtract_sp_regidx is %rX, and fextra_info->stack_bought is N.
- 3 -- We've reserved space for a new stack frame. This means we
- either saw a simple `ahi %r15,-N' in state 1, or the final
- `s %r15, ...' in state 2.
- 4 -- The frame and link are now fully initialized. We've
- reserved space for the new stack frame, and stored the old
- stack pointer captured in the back chain pointer field. */
- int save_link_state = 0;
- int save_link_regidx, subtract_sp_regidx;
-
- /* What we've seen so far regarding r12 --- the GOT (Global Offset
- Table) pointer. We expect to see `l %r12, N(%r13)', which loads
- r12 with the offset from the constant pool to the GOT, and then
- an `ar %r12, %r13', which adds the constant pool address,
- yielding the GOT's address. Here's what got_state means:
- 0 -- seen nothing
- 1 -- seen `l %r12, N(%r13)', but no `ar'
- 2 -- seen load and add, so GOT pointer is totally initialized
- When got_state is 1, then got_load_addr is the address of the
- load instruction, and got_load_len is the length of that
- instruction. */
- int got_state= 0;
- CORE_ADDR got_load_addr = 0, got_load_len = 0;
-
- const_pool_state = varargs_state = 0;
-
- memset (gprs_saved, 0, sizeof (gprs_saved));
- memset (fprs_saved, 0, sizeof (fprs_saved));
- info.read_memory_func = deprecated_tm_print_insn_info.read_memory_func;
-
- save_link_regidx = subtract_sp_regidx = 0;
- if (fextra_info)
+int s390_regmap_gregset[S390_NUM_REGS] =
+{
+ /* Program Status Word. */
+ 0x00, 0x04,
+ /* General Purpose Registers. */
+ 0x08, 0x0c, 0x10, 0x14,
+ 0x18, 0x1c, 0x20, 0x24,
+ 0x28, 0x2c, 0x30, 0x34,
+ 0x38, 0x3c, 0x40, 0x44,
+ /* Access Registers. */
+ 0x48, 0x4c, 0x50, 0x54,
+ 0x58, 0x5c, 0x60, 0x64,
+ 0x68, 0x6c, 0x70, 0x74,
+ 0x78, 0x7c, 0x80, 0x84,
+ /* Floating Point Control Word. */
+ -1,
+ /* Floating Point Registers. */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+};
+
+int s390x_regmap_gregset[S390_NUM_REGS] =
+{
+ 0x00, 0x08,
+ /* General Purpose Registers. */
+ 0x10, 0x18, 0x20, 0x28,
+ 0x30, 0x38, 0x40, 0x48,
+ 0x50, 0x58, 0x60, 0x68,
+ 0x70, 0x78, 0x80, 0x88,
+ /* Access Registers. */
+ 0x90, 0x94, 0x98, 0x9c,
+ 0xa0, 0xa4, 0xa8, 0xac,
+ 0xb0, 0xb4, 0xb8, 0xbc,
+ 0xc0, 0xc4, 0xc8, 0xcc,
+ /* Floating Point Control Word. */
+ -1,
+ /* Floating Point Registers. */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+};
+
+int s390_regmap_fpregset[S390_NUM_REGS] =
+{
+ /* Program Status Word. */
+ -1, -1,
+ /* General Purpose Registers. */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ /* Access Registers. */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ /* Floating Point Control Word. */
+ 0x00,
+ /* Floating Point Registers. */
+ 0x08, 0x10, 0x18, 0x20,
+ 0x28, 0x30, 0x38, 0x40,
+ 0x48, 0x50, 0x58, 0x60,
+ 0x68, 0x70, 0x78, 0x80,
+};
+
+/* Supply register REGNUM from the register set REGSET to register cache
+ REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
+static void
+s390_supply_regset (const struct regset *regset, struct regcache *regcache,
+ int regnum, const void *regs, size_t len)
+{
+ const int *offset = regset->descr;
+ int i;
+
+ for (i = 0; i < S390_NUM_REGS; i++)
{
- if (fi && get_frame_base (fi))
- {
- orig_sp = get_frame_base (fi);
- if (! init_extra_info && fextra_info->initialised)
- orig_sp += fextra_info->stack_bought;
- saved_regs = get_frame_saved_regs (fi);
- }
- if (init_extra_info || !fextra_info->initialised)
- {
- s390_memset_extra_info (fextra_info);
- fextra_info->function_start = pc;
- fextra_info->initialised = 1;
- }
+ if ((regnum == i || regnum == -1) && offset[i] != -1)
+ regcache_raw_supply (regcache, i, (const char *)regs + offset[i]);
}
- instrlen = 0;
- do
+}
+
+/* Collect register REGNUM from the register cache REGCACHE and store
+ it in the buffer specified by REGS and LEN as described by the
+ general-purpose register set REGSET. If REGNUM is -1, do this for
+ all registers in REGSET. */
+static void
+s390_collect_regset (const struct regset *regset,
+ const struct regcache *regcache,
+ int regnum, void *regs, size_t len)
+{
+ const int *offset = regset->descr;
+ int i;
+
+ for (i = 0; i < S390_NUM_REGS; i++)
{
- valid_prologue = 0;
- test_pc += instrlen;
- /* add the previous instruction len */
- instrlen = s390_readinstruction (instr, test_pc, &info);
- if (instrlen < 0)
- {
- good_prologue = 0;
- err = -1;
- break;
- }
- /* We probably are in a glibc syscall */
- if (instr[0] == S390_SYSCALL_OPCODE && test_pc == pc)
- {
- good_prologue = 1;
- if (saved_regs && fextra_info && get_next_frame (fi)
- && get_frame_extra_info (get_next_frame (fi))
- && get_frame_extra_info (get_next_frame (fi))->sigcontext)
- {
- /* We are backtracing from a signal handler */
- save_reg_addr = get_frame_extra_info (get_next_frame (fi))->sigcontext +
- REGISTER_BYTE (S390_GP0_REGNUM);
- for (regidx = 0; regidx < S390_NUM_GPRS; regidx++)
- {
- saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr;
- save_reg_addr += S390_GPR_SIZE;
- }
- save_reg_addr = get_frame_extra_info (get_next_frame (fi))->sigcontext +
- (GDB_TARGET_IS_ESAME ? S390X_SIGREGS_FP0_OFFSET :
- S390_SIGREGS_FP0_OFFSET);
- for (regidx = 0; regidx < S390_NUM_FPRS; regidx++)
- {
- saved_regs[S390_FP0_REGNUM + regidx] = save_reg_addr;
- save_reg_addr += S390_FPR_SIZE;
- }
- }
- break;
- }
- if (save_link_state == 0)
- {
- /* check for a stack relative STMG or STM */
- if (((GDB_TARGET_IS_ESAME &&
- ((instr[0] == 0xeb) && (instr[5] == 0x24))) ||
- (instr[0] == 0x90)) && ((instr[2] >> 4) == 0xf))
- {
- regidx = (instr[1] >> 4);
- if (regidx < 6)
- varargs_state = 1;
- offset = ((instr[2] & 0xf) << 8) + instr[3];
- expected_offset =
- S390_GPR6_STACK_OFFSET + (S390_GPR_SIZE * (regidx - 6));
- if (offset != expected_offset)
- {
- good_prologue = 0;
- break;
- }
- if (saved_regs)
- save_reg_addr = orig_sp + offset;
- for (; regidx <= (instr[1] & 0xf); regidx++)
- {
- if (gprs_saved[regidx])
- {
- good_prologue = 0;
- break;
- }
- good_prologue = 1;
- gprs_saved[regidx] = 1;
- if (saved_regs)
- {
- saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr;
- save_reg_addr += S390_GPR_SIZE;
- }
- }
- valid_prologue = 1;
- continue;
- }
- }
- /* check for a stack relative STG or ST */
- if ((save_link_state == 0 || save_link_state == 3) &&
- ((GDB_TARGET_IS_ESAME &&
- ((instr[0] == 0xe3) && (instr[5] == 0x24))) ||
- (instr[0] == 0x50)) && ((instr[2] >> 4) == 0xf))
- {
- regidx = instr[1] >> 4;
- offset = ((instr[2] & 0xf) << 8) + instr[3];
- if (offset == 0)
- {
- if (save_link_state == 3 && regidx == save_link_regidx)
- {
- save_link_state = 4;
- valid_prologue = 1;
- continue;
- }
- else
- break;
- }
- if (regidx < 6)
- varargs_state = 1;
- expected_offset =
- S390_GPR6_STACK_OFFSET + (S390_GPR_SIZE * (regidx - 6));
- if (offset != expected_offset)
- {
- good_prologue = 0;
- break;
- }
- if (gprs_saved[regidx])
- {
- good_prologue = 0;
- break;
- }
- good_prologue = 1;
- gprs_saved[regidx] = 1;
- if (saved_regs)
- {
- save_reg_addr = orig_sp + offset;
- saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr;
- }
- valid_prologue = 1;
- continue;
- }
+ if ((regnum == i || regnum == -1) && offset[i] != -1)
+ regcache_raw_collect (regcache, i, (char *)regs + offset[i]);
+ }
+}
- /* Check for an fp-relative STG, ST, or STM. This is probably
- spilling an argument from a register out into a stack slot.
- This could be a user instruction, but if we haven't included
- any other suspicious instructions in the prologue, this
- could only be an initializing store, which isn't too bad to
- skip. The consequences of not including arg-to-stack spills
- are more serious, though --- you don't see the proper values
- of the arguments. */
- if ((save_link_state == 3 || save_link_state == 4)
- && ((instr[0] == 0x50 /* st %rA, D(%rX,%rB) */
- && (instr[1] & 0xf) == 0 /* %rX is zero, no index reg */
- && is_arg_reg ((instr[1] >> 4) & 0xf)
- && ((instr[2] >> 4) & 0xf) == frame_pointer_regidx)
- || (instr[0] == 0x90 /* stm %rA, %rB, D(%rC) */
- && is_arg_reg ((instr[1] >> 4) & 0xf)
- && is_arg_reg (instr[1] & 0xf)
- && ((instr[2] >> 4) & 0xf) == frame_pointer_regidx)))
- {
- valid_prologue = 1;
- continue;
- }
+static const struct regset s390_gregset = {
+ s390_regmap_gregset,
+ s390_supply_regset,
+ s390_collect_regset
+};
- /* check for STD */
- if (instr[0] == 0x60 && (instr[2] >> 4) == 0xf)
- {
- regidx = instr[1] >> 4;
- if (regidx == 0 || regidx == 2)
- varargs_state = 1;
- if (fprs_saved[regidx])
- {
- good_prologue = 0;
- break;
- }
- fprs_saved[regidx] = 1;
- if (saved_regs)
- {
- save_reg_addr = orig_sp + (((instr[2] & 0xf) << 8) + instr[3]);
- saved_regs[S390_FP0_REGNUM + regidx] = save_reg_addr;
- }
- valid_prologue = 1;
- continue;
- }
+static const struct regset s390x_gregset = {
+ s390x_regmap_gregset,
+ s390_supply_regset,
+ s390_collect_regset
+};
+static const struct regset s390_fpregset = {
+ s390_regmap_fpregset,
+ s390_supply_regset,
+ s390_collect_regset
+};
- if (const_pool_state == 0)
- {
+/* Return the appropriate register set for the core section identified
+ by SECT_NAME and SECT_SIZE. */
+static const struct regset *
+s390_regset_from_core_section (struct gdbarch *gdbarch,
+ const char *sect_name, size_t sect_size)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- if (GDB_TARGET_IS_ESAME)
- {
- /* Check for larl CONST_POOL_REGIDX,offset on ESAME */
- if ((instr[0] == 0xc0)
- && (instr[1] == (CONST_POOL_REGIDX << 4)))
- {
- const_pool_state = 2;
- valid_prologue = 1;
- continue;
- }
- }
- else
- {
- /* Check for BASR gpr13,gpr0 used to load constant pool pointer to r13 in old compiler */
- if (instr[0] == 0xd && (instr[1] & 0xf) == 0
- && ((instr[1] >> 4) == CONST_POOL_REGIDX))
- {
- const_pool_state = 1;
- valid_prologue = 1;
- continue;
- }
- }
- /* Check for new fangled bras %r13,newpc to load new constant pool */
- /* embedded in code, older pre abi compilers also emitted this stuff. */
- if ((instr[0] == 0xa7) && ((instr[1] & 0xf) == 0x5) &&
- ((instr[1] >> 4) == CONST_POOL_REGIDX)
- && ((instr[2] & 0x80) == 0))
- {
- const_pool_state = 2;
- test_pc +=
- (((((instr[2] & 0xf) << 8) + instr[3]) << 1) - instrlen);
- valid_prologue = 1;
- continue;
- }
- }
- /* Check for AGHI or AHI CONST_POOL_REGIDX,val */
- if (const_pool_state == 1 && (instr[0] == 0xa7) &&
- ((GDB_TARGET_IS_ESAME &&
- (instr[1] == ((CONST_POOL_REGIDX << 4) | 0xb))) ||
- (instr[1] == ((CONST_POOL_REGIDX << 4) | 0xa))))
- {
- const_pool_state = 2;
- valid_prologue = 1;
- continue;
- }
- /* Check for LGR or LR gprx,15 */
- if ((GDB_TARGET_IS_ESAME &&
- instr[0] == 0xb9 && instr[1] == 0x04 && (instr[3] & 0xf) == 0xf) ||
- (instr[0] == 0x18 && (instr[1] & 0xf) == 0xf))
- {
- if (GDB_TARGET_IS_ESAME)
- regidx = instr[3] >> 4;
- else
- regidx = instr[1] >> 4;
- if (save_link_state == 0 && regidx != 0xb)
- {
- /* Almost defintely code for
- decrementing the stack pointer
- ( i.e. a non leaf function
- or else leaf with locals ) */
- save_link_regidx = regidx;
- save_link_state = 1;
- valid_prologue = 1;
- continue;
- }
- /* We use this frame pointer for alloca
- unfortunately we need to assume its gpr11
- otherwise we would need a smarter prologue
- walker. */
- if (!frame_pointer_found && regidx == 0xb)
- {
- frame_pointer_regidx = 0xb;
- frame_pointer_found = 1;
- if (fextra_info)
- fextra_info->frame_pointer_saved_pc = test_pc;
- valid_prologue = 1;
- continue;
- }
- }
- /* Check for AHI or AGHI gpr15,val */
- if (save_link_state == 1 && (instr[0] == 0xa7) &&
- ((GDB_TARGET_IS_ESAME && (instr[1] == 0xfb)) || (instr[1] == 0xfa)))
- {
- if (fextra_info)
- fextra_info->stack_bought =
- -extract_signed_integer (&instr[2], 2);
- save_link_state = 3;
- valid_prologue = 1;
- continue;
- }
- /* Alternatively check for the complex construction for
- buying more than 32k of stack
- BRAS gprx,.+8
- long val
- s %r15,0(%gprx) gprx currently r1 */
- if ((save_link_state == 1) && (instr[0] == 0xa7)
- && ((instr[1] & 0xf) == 0x5) && (instr[2] == 0)
- && (instr[3] == 0x4) && ((instr[1] >> 4) != CONST_POOL_REGIDX))
- {
- subtract_sp_regidx = instr[1] >> 4;
- save_link_state = 2;
- if (fextra_info)
- target_read_memory (test_pc + instrlen,
- (char *) &fextra_info->stack_bought,
- sizeof (fextra_info->stack_bought));
- test_pc += 4;
- valid_prologue = 1;
- continue;
- }
- if (save_link_state == 2 && instr[0] == 0x5b
- && instr[1] == 0xf0 &&
- instr[2] == (subtract_sp_regidx << 4) && instr[3] == 0)
- {
- save_link_state = 3;
- valid_prologue = 1;
- continue;
- }
- /* check for LA gprx,offset(15) used for varargs */
- if ((instr[0] == 0x41) && ((instr[2] >> 4) == 0xf) &&
- ((instr[1] & 0xf) == 0))
- {
- /* some code uses gpr7 to point to outgoing args */
- if (((instr[1] >> 4) == 7) && (save_link_state == 0) &&
- ((instr[2] & 0xf) == 0)
- && (instr[3] == S390_STACK_FRAME_OVERHEAD))
- {
- valid_prologue = 1;
- continue;
- }
- if (varargs_state == 1)
- {
- varargs_state = 2;
- valid_prologue = 1;
- continue;
- }
- }
- /* Check for a GOT load */
+ if (strcmp (sect_name, ".reg") == 0 && sect_size >= tdep->sizeof_gregset)
+ return tdep->gregset;
- if (GDB_TARGET_IS_ESAME)
- {
- /* Check for larl GOT_REGIDX, on ESAME */
- if ((got_state == 0) && (instr[0] == 0xc0)
- && (instr[1] == (GOT_REGIDX << 4)))
- {
- got_state = 2;
- valid_prologue = 1;
- continue;
- }
- }
- else
- {
- /* check for l GOT_REGIDX,x(CONST_POOL_REGIDX) */
- if (got_state == 0 && const_pool_state == 2 && instr[0] == 0x58
- && (instr[2] == (CONST_POOL_REGIDX << 4))
- && ((instr[1] >> 4) == GOT_REGIDX))
- {
- got_state = 1;
- got_load_addr = test_pc;
- got_load_len = instrlen;
- valid_prologue = 1;
- continue;
- }
- /* Check for subsequent ar got_regidx,basr_regidx */
- if (got_state == 1 && instr[0] == 0x1a &&
- instr[1] == ((GOT_REGIDX << 4) | CONST_POOL_REGIDX))
- {
- got_state = 2;
- valid_prologue = 1;
- continue;
- }
- }
- }
- while (valid_prologue && good_prologue);
- if (good_prologue)
+ if (strcmp (sect_name, ".reg2") == 0 && sect_size >= tdep->sizeof_fpregset)
+ return tdep->fpregset;
+
+ return NULL;
+}
+
+
+/* Decoding S/390 instructions. */
+
+/* Named opcode values for the S/390 instructions we recognize. Some
+ instructions have their opcode split across two fields; those are the
+ op1_* and op2_* enums. */
+enum
+ {
+ op1_lhi = 0xa7, op2_lhi = 0x08,
+ op1_lghi = 0xa7, op2_lghi = 0x09,
+ op1_lgfi = 0xc0, op2_lgfi = 0x01,
+ op_lr = 0x18,
+ op_lgr = 0xb904,
+ op_l = 0x58,
+ op1_ly = 0xe3, op2_ly = 0x58,
+ op1_lg = 0xe3, op2_lg = 0x04,
+ op_lm = 0x98,
+ op1_lmy = 0xeb, op2_lmy = 0x98,
+ op1_lmg = 0xeb, op2_lmg = 0x04,
+ op_st = 0x50,
+ op1_sty = 0xe3, op2_sty = 0x50,
+ op1_stg = 0xe3, op2_stg = 0x24,
+ op_std = 0x60,
+ op_stm = 0x90,
+ op1_stmy = 0xeb, op2_stmy = 0x90,
+ op1_stmg = 0xeb, op2_stmg = 0x24,
+ op1_aghi = 0xa7, op2_aghi = 0x0b,
+ op1_ahi = 0xa7, op2_ahi = 0x0a,
+ op1_agfi = 0xc2, op2_agfi = 0x08,
+ op1_afi = 0xc2, op2_afi = 0x09,
+ op1_algfi= 0xc2, op2_algfi= 0x0a,
+ op1_alfi = 0xc2, op2_alfi = 0x0b,
+ op_ar = 0x1a,
+ op_agr = 0xb908,
+ op_a = 0x5a,
+ op1_ay = 0xe3, op2_ay = 0x5a,
+ op1_ag = 0xe3, op2_ag = 0x08,
+ op1_slgfi= 0xc2, op2_slgfi= 0x04,
+ op1_slfi = 0xc2, op2_slfi = 0x05,
+ op_sr = 0x1b,
+ op_sgr = 0xb909,
+ op_s = 0x5b,
+ op1_sy = 0xe3, op2_sy = 0x5b,
+ op1_sg = 0xe3, op2_sg = 0x09,
+ op_nr = 0x14,
+ op_ngr = 0xb980,
+ op_la = 0x41,
+ op1_lay = 0xe3, op2_lay = 0x71,
+ op1_larl = 0xc0, op2_larl = 0x00,
+ op_basr = 0x0d,
+ op_bas = 0x4d,
+ op_bcr = 0x07,
+ op_bc = 0x0d,
+ op1_bras = 0xa7, op2_bras = 0x05,
+ op1_brasl= 0xc0, op2_brasl= 0x05,
+ op1_brc = 0xa7, op2_brc = 0x04,
+ op1_brcl = 0xc0, op2_brcl = 0x04,
+ };
+
+
+/* Read a single instruction from address AT. */
+
+#define S390_MAX_INSTR_SIZE 6
+static int
+s390_readinstruction (bfd_byte instr[], CORE_ADDR at)
+{
+ static int s390_instrlen[] = { 2, 4, 4, 6 };
+ int instrlen;
+
+ if (target_read_memory (at, &instr[0], 2))
+ return -1;
+ instrlen = s390_instrlen[instr[0] >> 6];
+ if (instrlen > 2)
{
- /* If this function doesn't reference the global offset table,
- then the compiler may use r12 for other things. If the last
- instruction we saw was a load of r12 from the constant pool,
- with no subsequent add to make the address PC-relative, then
- the load was probably a genuine body instruction; don't treat
- it as part of the prologue. */
- if (got_state == 1
- && got_load_addr + got_load_len == test_pc)
- {
- test_pc = got_load_addr;
- instrlen = got_load_len;
- }
-
- good_prologue = (((const_pool_state == 0) || (const_pool_state == 2)) &&
- ((save_link_state == 0) || (save_link_state == 4)) &&
- ((varargs_state == 0) || (varargs_state == 2)));
+ if (target_read_memory (at + 2, &instr[2], instrlen - 2))
+ return -1;
}
- if (fextra_info)
+ return instrlen;
+}
+
+
+/* The functions below are for recognizing and decoding S/390
+ instructions of various formats. Each of them checks whether INSN
+ is an instruction of the given format, with the specified opcodes.
+ If it is, it sets the remaining arguments to the values of the
+ instruction's fields, and returns a non-zero value; otherwise, it
+ returns zero.
+
+ These functions' arguments appear in the order they appear in the
+ instruction, not in the machine-language form. So, opcodes always
+ come first, even though they're sometimes scattered around the
+ instructions. And displacements appear before base and extension
+ registers, as they do in the assembly syntax, not at the end, as
+ they do in the machine language. */
+static int
+is_ri (bfd_byte *insn, int op1, int op2, unsigned int *r1, int *i2)
+{
+ if (insn[0] == op1 && (insn[1] & 0xf) == op2)
{
- fextra_info->good_prologue = good_prologue;
- fextra_info->skip_prologue_function_start =
- (good_prologue ? test_pc : pc);
+ *r1 = (insn[1] >> 4) & 0xf;
+ /* i2 is a 16-bit signed quantity. */
+ *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
+ return 1;
}
- if (saved_regs)
- /* The SP's element of the saved_regs array holds the old SP,
- not the address at which it is saved. */
- saved_regs[S390_SP_REGNUM] = orig_sp;
- return err;
+ else
+ return 0;
}
-int
-s390_check_function_end (CORE_ADDR pc)
+static int
+is_ril (bfd_byte *insn, int op1, int op2,
+ unsigned int *r1, int *i2)
{
- bfd_byte instr[S390_MAX_INSTR_SIZE];
- disassemble_info info;
- int regidx, instrlen;
-
- info.read_memory_func = deprecated_tm_print_insn_info.read_memory_func;
- instrlen = s390_readinstruction (instr, pc, &info);
- if (instrlen < 0)
- return -1;
- /* check for BR */
- if (instrlen != 2 || instr[0] != 07 || (instr[1] >> 4) != 0xf)
+ if (insn[0] == op1 && (insn[1] & 0xf) == op2)
+ {
+ *r1 = (insn[1] >> 4) & 0xf;
+ /* i2 is a signed quantity. If the host 'int' is 32 bits long,
+ no sign extension is necessary, but we don't want to assume
+ that. */
+ *i2 = (((insn[2] << 24)
+ | (insn[3] << 16)
+ | (insn[4] << 8)
+ | (insn[5])) ^ 0x80000000) - 0x80000000;
+ return 1;
+ }
+ else
return 0;
- regidx = instr[1] & 0xf;
- /* Check for LMG or LG */
- instrlen =
- s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 6 : 4), &info);
- if (instrlen < 0)
- return -1;
- if (GDB_TARGET_IS_ESAME)
+}
+
+
+static int
+is_rr (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
+{
+ if (insn[0] == op)
{
+ *r1 = (insn[1] >> 4) & 0xf;
+ *r2 = insn[1] & 0xf;
+ return 1;
+ }
+ else
+ return 0;
+}
- if (instrlen != 6 || instr[0] != 0xeb || instr[5] != 0x4)
- return 0;
+
+static int
+is_rre (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
+{
+ if (((insn[0] << 8) | insn[1]) == op)
+ {
+ /* Yes, insn[3]. insn[2] is unused in RRE format. */
+ *r1 = (insn[3] >> 4) & 0xf;
+ *r2 = insn[3] & 0xf;
+ return 1;
}
- else if (instrlen != 4 || instr[0] != 0x98)
+ else
+ return 0;
+}
+
+
+static int
+is_rs (bfd_byte *insn, int op,
+ unsigned int *r1, unsigned int *r3, unsigned int *d2, unsigned int *b2)
+{
+ if (insn[0] == op)
{
- return 0;
+ *r1 = (insn[1] >> 4) & 0xf;
+ *r3 = insn[1] & 0xf;
+ *b2 = (insn[2] >> 4) & 0xf;
+ *d2 = ((insn[2] & 0xf) << 8) | insn[3];
+ return 1;
}
- if ((instr[2] >> 4) != 0xf)
+ else
return 0;
- if (regidx == 14)
- return 1;
- instrlen = s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 12 : 8),
- &info);
- if (instrlen < 0)
- return -1;
- if (GDB_TARGET_IS_ESAME)
+}
+
+
+static int
+is_rsy (bfd_byte *insn, int op1, int op2,
+ unsigned int *r1, unsigned int *r3, unsigned int *d2, unsigned int *b2)
+{
+ if (insn[0] == op1
+ && insn[5] == op2)
{
- /* Check for LG */
- if (instrlen != 6 || instr[0] != 0xe3 || instr[5] != 0x4)
- return 0;
+ *r1 = (insn[1] >> 4) & 0xf;
+ *r3 = insn[1] & 0xf;
+ *b2 = (insn[2] >> 4) & 0xf;
+ /* The 'long displacement' is a 20-bit signed integer. */
+ *d2 = ((((insn[2] & 0xf) << 8) | insn[3] | (insn[4] << 12))
+ ^ 0x80000) - 0x80000;
+ return 1;
}
else
+ return 0;
+}
+
+
+static int
+is_rx (bfd_byte *insn, int op,
+ unsigned int *r1, unsigned int *d2, unsigned int *x2, unsigned int *b2)
+{
+ if (insn[0] == op)
{
- /* Check for L */
- if (instrlen != 4 || instr[0] != 0x58)
- return 0;
+ *r1 = (insn[1] >> 4) & 0xf;
+ *x2 = insn[1] & 0xf;
+ *b2 = (insn[2] >> 4) & 0xf;
+ *d2 = ((insn[2] & 0xf) << 8) | insn[3];
+ return 1;
}
- if (instr[2] >> 4 != 0xf)
+ else
return 0;
- if (instr[1] >> 4 != regidx)
+}
+
+
+static int
+is_rxy (bfd_byte *insn, int op1, int op2,
+ unsigned int *r1, unsigned int *d2, unsigned int *x2, unsigned int *b2)
+{
+ if (insn[0] == op1
+ && insn[5] == op2)
+ {
+ *r1 = (insn[1] >> 4) & 0xf;
+ *x2 = insn[1] & 0xf;
+ *b2 = (insn[2] >> 4) & 0xf;
+ /* The 'long displacement' is a 20-bit signed integer. */
+ *d2 = ((((insn[2] & 0xf) << 8) | insn[3] | (insn[4] << 12))
+ ^ 0x80000) - 0x80000;
+ return 1;
+ }
+ else
return 0;
- return 1;
}
-static CORE_ADDR
-s390_sniff_pc_function_start (CORE_ADDR pc, struct frame_info *fi)
+
+/* Prologue analysis. */
+
+#define S390_NUM_GPRS 16
+#define S390_NUM_FPRS 16
+
+struct s390_prologue_data {
+
+ /* The stack. */
+ struct pv_area *stack;
+
+ /* The size of a GPR or FPR. */
+ int gpr_size;
+ int fpr_size;
+
+ /* The general-purpose registers. */
+ pv_t gpr[S390_NUM_GPRS];
+
+ /* The floating-point registers. */
+ pv_t fpr[S390_NUM_FPRS];
+
+ /* The offset relative to the CFA where the incoming GPR N was saved
+ by the function prologue. 0 if not saved or unknown. */
+ int gpr_slot[S390_NUM_GPRS];
+
+ /* Likewise for FPRs. */
+ int fpr_slot[S390_NUM_FPRS];
+
+ /* Nonzero if the backchain was saved. This is assumed to be the
+ case when the incoming SP is saved at the current SP location. */
+ int back_chain_saved_p;
+};
+
+/* Return the effective address for an X-style instruction, like:
+
+ L R1, D2(X2, B2)
+
+ Here, X2 and B2 are registers, and D2 is a signed 20-bit
+ constant; the effective address is the sum of all three. If either
+ X2 or B2 are zero, then it doesn't contribute to the sum --- this
+ means that r0 can't be used as either X2 or B2. */
+static pv_t
+s390_addr (struct s390_prologue_data *data,
+ int d2, unsigned int x2, unsigned int b2)
{
- CORE_ADDR function_start, test_function_start;
- int loop_cnt, err, function_end;
- struct frame_extra_info fextra_info;
- function_start = get_pc_function_start (pc);
+ pv_t result;
+
+ result = pv_constant (d2);
+ if (x2)
+ result = pv_add (result, data->gpr[x2]);
+ if (b2)
+ result = pv_add (result, data->gpr[b2]);
+
+ return result;
+}
- if (function_start == 0)
+/* Do a SIZE-byte store of VALUE to D2(X2,B2). */
+static void
+s390_store (struct s390_prologue_data *data,
+ int d2, unsigned int x2, unsigned int b2, CORE_ADDR size,
+ pv_t value)
+{
+ pv_t addr = s390_addr (data, d2, x2, b2);
+ pv_t offset;
+
+ /* Check whether we are storing the backchain. */
+ offset = pv_subtract (data->gpr[S390_SP_REGNUM - S390_R0_REGNUM], addr);
+
+ if (pv_is_constant (offset) && offset.k == 0)
+ if (size == data->gpr_size
+ && pv_is_register_k (value, S390_SP_REGNUM, 0))
+ {
+ data->back_chain_saved_p = 1;
+ return;
+ }
+
+
+ /* Check whether we are storing a register into the stack. */
+ if (!pv_area_store_would_trash (data->stack, addr))
+ pv_area_store (data->stack, addr, size, value);
+
+
+ /* Note: If this is some store we cannot identify, you might think we
+ should forget our cached values, as any of those might have been hit.
+
+ However, we make the assumption that the register save areas are only
+ ever stored to once in any given function, and we do recognize these
+ stores. Thus every store we cannot recognize does not hit our data. */
+}
+
+/* Do a SIZE-byte load from D2(X2,B2). */
+static pv_t
+s390_load (struct s390_prologue_data *data,
+ int d2, unsigned int x2, unsigned int b2, CORE_ADDR size)
+
+{
+ pv_t addr = s390_addr (data, d2, x2, b2);
+ pv_t offset;
+
+ /* If it's a load from an in-line constant pool, then we can
+ simulate that, under the assumption that the code isn't
+ going to change between the time the processor actually
+ executed it creating the current frame, and the time when
+ we're analyzing the code to unwind past that frame. */
+ if (pv_is_constant (addr))
{
- test_function_start = pc;
- if (test_function_start & 1)
- return 0; /* This has to be bogus */
- loop_cnt = 0;
- do
+ struct target_section *secp;
+ secp = target_section_by_addr (¤t_target, addr.k);
+ if (secp != NULL
+ && (bfd_get_section_flags (secp->bfd, secp->the_bfd_section)
+ & SEC_READONLY))
+ return pv_constant (read_memory_integer (addr.k, size));
+ }
+
+ /* Check whether we are accessing one of our save slots. */
+ return pv_area_fetch (data->stack, addr, size);
+}
+
+/* Function for finding saved registers in a 'struct pv_area'; we pass
+ this to pv_area_scan.
+
+ If VALUE is a saved register, ADDR says it was saved at a constant
+ offset from the frame base, and SIZE indicates that the whole
+ register was saved, record its offset in the reg_offset table in
+ PROLOGUE_UNTYPED. */
+static void
+s390_check_for_saved (void *data_untyped, pv_t addr, CORE_ADDR size, pv_t value)
+{
+ struct s390_prologue_data *data = data_untyped;
+ int i, offset;
+
+ if (!pv_is_register (addr, S390_SP_REGNUM))
+ return;
+
+ offset = 16 * data->gpr_size + 32 - addr.k;
+
+ /* If we are storing the original value of a register, we want to
+ record the CFA offset. If the same register is stored multiple
+ times, the stack slot with the highest address counts. */
+
+ for (i = 0; i < S390_NUM_GPRS; i++)
+ if (size == data->gpr_size
+ && pv_is_register_k (value, S390_R0_REGNUM + i, 0))
+ if (data->gpr_slot[i] == 0
+ || data->gpr_slot[i] > offset)
{
+ data->gpr_slot[i] = offset;
+ return;
+ }
- err =
- s390_get_frame_info (test_function_start, &fextra_info, fi, 1);
- loop_cnt++;
- test_function_start -= 2;
- function_end = s390_check_function_end (test_function_start);
+ for (i = 0; i < S390_NUM_FPRS; i++)
+ if (size == data->fpr_size
+ && pv_is_register_k (value, S390_F0_REGNUM + i, 0))
+ if (data->fpr_slot[i] == 0
+ || data->fpr_slot[i] > offset)
+ {
+ data->fpr_slot[i] = offset;
+ return;
}
- while (!(function_end == 1 || err || loop_cnt >= 4096 ||
- (fextra_info.good_prologue)));
- if (fextra_info.good_prologue)
- function_start = fextra_info.function_start;
- else if (function_end == 1)
- function_start = test_function_start;
- }
- return function_start;
}
+/* Analyze the prologue of the function starting at START_PC,
+ continuing at most until CURRENT_PC. Initialize DATA to
+ hold all information we find out about the state of the registers
+ and stack slots. Return the address of the instruction after
+ the last one that changed the SP, FP, or back chain; or zero
+ on error. */
+static CORE_ADDR
+s390_analyze_prologue (struct gdbarch *gdbarch,
+ CORE_ADDR start_pc,
+ CORE_ADDR current_pc,
+ struct s390_prologue_data *data)
+{
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+
+ /* Our return value:
+ The address of the instruction after the last one that changed
+ the SP, FP, or back chain; zero if we got an error trying to
+ read memory. */
+ CORE_ADDR result = start_pc;
+
+ /* The current PC for our abstract interpretation. */
+ CORE_ADDR pc;
+
+ /* The address of the next instruction after that. */
+ CORE_ADDR next_pc;
+
+ /* Set up everything's initial value. */
+ {
+ int i;
+
+ data->stack = make_pv_area (S390_SP_REGNUM, gdbarch_addr_bit (gdbarch));
+
+ /* For the purpose of prologue tracking, we consider the GPR size to
+ be equal to the ABI word size, even if it is actually larger
+ (i.e. when running a 32-bit binary under a 64-bit kernel). */
+ data->gpr_size = word_size;
+ data->fpr_size = 8;
+
+ for (i = 0; i < S390_NUM_GPRS; i++)
+ data->gpr[i] = pv_register (S390_R0_REGNUM + i, 0);
+
+ for (i = 0; i < S390_NUM_FPRS; i++)
+ data->fpr[i] = pv_register (S390_F0_REGNUM + i, 0);
+
+ for (i = 0; i < S390_NUM_GPRS; i++)
+ data->gpr_slot[i] = 0;
+
+ for (i = 0; i < S390_NUM_FPRS; i++)
+ data->fpr_slot[i] = 0;
+
+ data->back_chain_saved_p = 0;
+ }
+
+ /* Start interpreting instructions, until we hit the frame's
+ current PC or the first branch instruction. */
+ for (pc = start_pc; pc > 0 && pc < current_pc; pc = next_pc)
+ {
+ bfd_byte insn[S390_MAX_INSTR_SIZE];
+ int insn_len = s390_readinstruction (insn, pc);
+
+ bfd_byte dummy[S390_MAX_INSTR_SIZE] = { 0 };
+ bfd_byte *insn32 = word_size == 4 ? insn : dummy;
+ bfd_byte *insn64 = word_size == 8 ? insn : dummy;
+
+ /* Fields for various kinds of instructions. */
+ unsigned int b2, r1, r2, x2, r3;
+ int i2, d2;
+
+ /* The values of SP and FP before this instruction,
+ for detecting instructions that change them. */
+ pv_t pre_insn_sp, pre_insn_fp;
+ /* Likewise for the flag whether the back chain was saved. */
+ int pre_insn_back_chain_saved_p;
+
+ /* If we got an error trying to read the instruction, report it. */
+ if (insn_len < 0)
+ {
+ result = 0;
+ break;
+ }
+
+ next_pc = pc + insn_len;
+
+ pre_insn_sp = data->gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+ pre_insn_fp = data->gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
+ pre_insn_back_chain_saved_p = data->back_chain_saved_p;
+
+
+ /* LHI r1, i2 --- load halfword immediate. */
+ /* LGHI r1, i2 --- load halfword immediate (64-bit version). */
+ /* LGFI r1, i2 --- load fullword immediate. */
+ if (is_ri (insn32, op1_lhi, op2_lhi, &r1, &i2)
+ || is_ri (insn64, op1_lghi, op2_lghi, &r1, &i2)
+ || is_ril (insn, op1_lgfi, op2_lgfi, &r1, &i2))
+ data->gpr[r1] = pv_constant (i2);
+
+ /* LR r1, r2 --- load from register. */
+ /* LGR r1, r2 --- load from register (64-bit version). */
+ else if (is_rr (insn32, op_lr, &r1, &r2)
+ || is_rre (insn64, op_lgr, &r1, &r2))
+ data->gpr[r1] = data->gpr[r2];
+
+ /* L r1, d2(x2, b2) --- load. */
+ /* LY r1, d2(x2, b2) --- load (long-displacement version). */
+ /* LG r1, d2(x2, b2) --- load (64-bit version). */
+ else if (is_rx (insn32, op_l, &r1, &d2, &x2, &b2)
+ || is_rxy (insn32, op1_ly, op2_ly, &r1, &d2, &x2, &b2)
+ || is_rxy (insn64, op1_lg, op2_lg, &r1, &d2, &x2, &b2))
+ data->gpr[r1] = s390_load (data, d2, x2, b2, data->gpr_size);
+
+ /* ST r1, d2(x2, b2) --- store. */
+ /* STY r1, d2(x2, b2) --- store (long-displacement version). */
+ /* STG r1, d2(x2, b2) --- store (64-bit version). */
+ else if (is_rx (insn32, op_st, &r1, &d2, &x2, &b2)
+ || is_rxy (insn32, op1_sty, op2_sty, &r1, &d2, &x2, &b2)
+ || is_rxy (insn64, op1_stg, op2_stg, &r1, &d2, &x2, &b2))
+ s390_store (data, d2, x2, b2, data->gpr_size, data->gpr[r1]);
+
+ /* STD r1, d2(x2,b2) --- store floating-point register. */
+ else if (is_rx (insn, op_std, &r1, &d2, &x2, &b2))
+ s390_store (data, d2, x2, b2, data->fpr_size, data->fpr[r1]);
+
+ /* STM r1, r3, d2(b2) --- store multiple. */
+ /* STMY r1, r3, d2(b2) --- store multiple (long-displacement version). */
+ /* STMG r1, r3, d2(b2) --- store multiple (64-bit version). */
+ else if (is_rs (insn32, op_stm, &r1, &r3, &d2, &b2)
+ || is_rsy (insn32, op1_stmy, op2_stmy, &r1, &r3, &d2, &b2)
+ || is_rsy (insn64, op1_stmg, op2_stmg, &r1, &r3, &d2, &b2))
+ {
+ for (; r1 <= r3; r1++, d2 += data->gpr_size)
+ s390_store (data, d2, 0, b2, data->gpr_size, data->gpr[r1]);
+ }
+
+ /* AHI r1, i2 --- add halfword immediate. */
+ /* AGHI r1, i2 --- add halfword immediate (64-bit version). */
+ /* AFI r1, i2 --- add fullword immediate. */
+ /* AGFI r1, i2 --- add fullword immediate (64-bit version). */
+ else if (is_ri (insn32, op1_ahi, op2_ahi, &r1, &i2)
+ || is_ri (insn64, op1_aghi, op2_aghi, &r1, &i2)
+ || is_ril (insn32, op1_afi, op2_afi, &r1, &i2)
+ || is_ril (insn64, op1_agfi, op2_agfi, &r1, &i2))
+ data->gpr[r1] = pv_add_constant (data->gpr[r1], i2);
+
+ /* ALFI r1, i2 --- add logical immediate. */
+ /* ALGFI r1, i2 --- add logical immediate (64-bit version). */
+ else if (is_ril (insn32, op1_alfi, op2_alfi, &r1, &i2)
+ || is_ril (insn64, op1_algfi, op2_algfi, &r1, &i2))
+ data->gpr[r1] = pv_add_constant (data->gpr[r1],
+ (CORE_ADDR)i2 & 0xffffffff);
+
+ /* AR r1, r2 -- add register. */
+ /* AGR r1, r2 -- add register (64-bit version). */
+ else if (is_rr (insn32, op_ar, &r1, &r2)
+ || is_rre (insn64, op_agr, &r1, &r2))
+ data->gpr[r1] = pv_add (data->gpr[r1], data->gpr[r2]);
+
+ /* A r1, d2(x2, b2) -- add. */
+ /* AY r1, d2(x2, b2) -- add (long-displacement version). */
+ /* AG r1, d2(x2, b2) -- add (64-bit version). */
+ else if (is_rx (insn32, op_a, &r1, &d2, &x2, &b2)
+ || is_rxy (insn32, op1_ay, op2_ay, &r1, &d2, &x2, &b2)
+ || is_rxy (insn64, op1_ag, op2_ag, &r1, &d2, &x2, &b2))
+ data->gpr[r1] = pv_add (data->gpr[r1],
+ s390_load (data, d2, x2, b2, data->gpr_size));
+
+ /* SLFI r1, i2 --- subtract logical immediate. */
+ /* SLGFI r1, i2 --- subtract logical immediate (64-bit version). */
+ else if (is_ril (insn32, op1_slfi, op2_slfi, &r1, &i2)
+ || is_ril (insn64, op1_slgfi, op2_slgfi, &r1, &i2))
+ data->gpr[r1] = pv_add_constant (data->gpr[r1],
+ -((CORE_ADDR)i2 & 0xffffffff));
+
+ /* SR r1, r2 -- subtract register. */
+ /* SGR r1, r2 -- subtract register (64-bit version). */
+ else if (is_rr (insn32, op_sr, &r1, &r2)
+ || is_rre (insn64, op_sgr, &r1, &r2))
+ data->gpr[r1] = pv_subtract (data->gpr[r1], data->gpr[r2]);
+
+ /* S r1, d2(x2, b2) -- subtract. */
+ /* SY r1, d2(x2, b2) -- subtract (long-displacement version). */
+ /* SG r1, d2(x2, b2) -- subtract (64-bit version). */
+ else if (is_rx (insn32, op_s, &r1, &d2, &x2, &b2)
+ || is_rxy (insn32, op1_sy, op2_sy, &r1, &d2, &x2, &b2)
+ || is_rxy (insn64, op1_sg, op2_sg, &r1, &d2, &x2, &b2))
+ data->gpr[r1] = pv_subtract (data->gpr[r1],
+ s390_load (data, d2, x2, b2, data->gpr_size));
+
+ /* LA r1, d2(x2, b2) --- load address. */
+ /* LAY r1, d2(x2, b2) --- load address (long-displacement version). */
+ else if (is_rx (insn, op_la, &r1, &d2, &x2, &b2)
+ || is_rxy (insn, op1_lay, op2_lay, &r1, &d2, &x2, &b2))
+ data->gpr[r1] = s390_addr (data, d2, x2, b2);
+
+ /* LARL r1, i2 --- load address relative long. */
+ else if (is_ril (insn, op1_larl, op2_larl, &r1, &i2))
+ data->gpr[r1] = pv_constant (pc + i2 * 2);
+
+ /* BASR r1, 0 --- branch and save.
+ Since r2 is zero, this saves the PC in r1, but doesn't branch. */
+ else if (is_rr (insn, op_basr, &r1, &r2)
+ && r2 == 0)
+ data->gpr[r1] = pv_constant (next_pc);
+
+ /* BRAS r1, i2 --- branch relative and save. */
+ else if (is_ri (insn, op1_bras, op2_bras, &r1, &i2))
+ {
+ data->gpr[r1] = pv_constant (next_pc);
+ next_pc = pc + i2 * 2;
+
+ /* We'd better not interpret any backward branches. We'll
+ never terminate. */
+ if (next_pc <= pc)
+ break;
+ }
+
+ /* Terminate search when hitting any other branch instruction. */
+ else if (is_rr (insn, op_basr, &r1, &r2)
+ || is_rx (insn, op_bas, &r1, &d2, &x2, &b2)
+ || is_rr (insn, op_bcr, &r1, &r2)
+ || is_rx (insn, op_bc, &r1, &d2, &x2, &b2)
+ || is_ri (insn, op1_brc, op2_brc, &r1, &i2)
+ || is_ril (insn, op1_brcl, op2_brcl, &r1, &i2)
+ || is_ril (insn, op1_brasl, op2_brasl, &r2, &i2))
+ break;
+
+ else
+ /* An instruction we don't know how to simulate. The only
+ safe thing to do would be to set every value we're tracking
+ to 'unknown'. Instead, we'll be optimistic: we assume that
+ we *can* interpret every instruction that the compiler uses
+ to manipulate any of the data we're interested in here --
+ then we can just ignore anything else. */
+ ;
+
+ /* Record the address after the last instruction that changed
+ the FP, SP, or backlink. Ignore instructions that changed
+ them back to their original values --- those are probably
+ restore instructions. (The back chain is never restored,
+ just popped.) */
+ {
+ pv_t sp = data->gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+ pv_t fp = data->gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
+
+ if ((! pv_is_identical (pre_insn_sp, sp)
+ && ! pv_is_register_k (sp, S390_SP_REGNUM, 0)
+ && sp.kind != pvk_unknown)
+ || (! pv_is_identical (pre_insn_fp, fp)
+ && ! pv_is_register_k (fp, S390_FRAME_REGNUM, 0)
+ && fp.kind != pvk_unknown)
+ || pre_insn_back_chain_saved_p != data->back_chain_saved_p)
+ result = next_pc;
+ }
+ }
+
+ /* Record where all the registers were saved. */
+ pv_area_scan (data->stack, s390_check_for_saved, data);
+ free_pv_area (data->stack);
+ data->stack = NULL;
-CORE_ADDR
-s390_function_start (struct frame_info *fi)
+ return result;
+}
+
+/* Advance PC across any function entry prologue instructions to reach
+ some "real" code. */
+static CORE_ADDR
+s390_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ struct s390_prologue_data data;
+ CORE_ADDR skip_pc;
+ skip_pc = s390_analyze_prologue (gdbarch, pc, (CORE_ADDR)-1, &data);
+ return skip_pc ? skip_pc : pc;
+}
+
+/* Return true if we are in the functin's epilogue, i.e. after the
+ instruction that destroyed the function's stack frame. */
+static int
+s390_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
{
- CORE_ADDR function_start = 0;
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+
+ /* In frameless functions, there's not frame to destroy and thus
+ we don't care about the epilogue.
+
+ In functions with frame, the epilogue sequence is a pair of
+ a LM-type instruction that restores (amongst others) the
+ return register %r14 and the stack pointer %r15, followed
+ by a branch 'br %r14' --or equivalent-- that effects the
+ actual return.
+
+ In that situation, this function needs to return 'true' in
+ exactly one case: when pc points to that branch instruction.
+
+ Thus we try to disassemble the one instructions immediately
+ preceeding pc and check whether it is an LM-type instruction
+ modifying the stack pointer.
+
+ Note that disassembling backwards is not reliable, so there
+ is a slight chance of false positives here ... */
- if (get_frame_extra_info (fi) && get_frame_extra_info (fi)->initialised)
- function_start = get_frame_extra_info (fi)->function_start;
- else if (get_frame_pc (fi))
- function_start = get_frame_func (fi);
- return function_start;
+ bfd_byte insn[6];
+ unsigned int r1, r3, b2;
+ int d2;
+
+ if (word_size == 4
+ && !target_read_memory (pc - 4, insn, 4)
+ && is_rs (insn, op_lm, &r1, &r3, &d2, &b2)
+ && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
+ return 1;
+
+ if (word_size == 4
+ && !target_read_memory (pc - 6, insn, 6)
+ && is_rsy (insn, op1_lmy, op2_lmy, &r1, &r3, &d2, &b2)
+ && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
+ return 1;
+
+ if (word_size == 8
+ && !target_read_memory (pc - 6, insn, 6)
+ && is_rsy (insn, op1_lmg, op2_lmg, &r1, &r3, &d2, &b2)
+ && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
+ return 1;
+
+ return 0;
}
+/* Normal stack frames. */
+
+struct s390_unwind_cache {
+
+ CORE_ADDR func;
+ CORE_ADDR frame_base;
+ CORE_ADDR local_base;
+
+ struct trad_frame_saved_reg *saved_regs;
+};
+
+static int
+s390_prologue_frame_unwind_cache (struct frame_info *this_frame,
+ struct s390_unwind_cache *info)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ struct s390_prologue_data data;
+ pv_t *fp = &data.gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
+ pv_t *sp = &data.gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+ int i;
+ CORE_ADDR cfa;
+ CORE_ADDR func;
+ CORE_ADDR result;
+ ULONGEST reg;
+ CORE_ADDR prev_sp;
+ int frame_pointer;
+ int size;
+
+ /* Try to find the function start address. If we can't find it, we don't
+ bother searching for it -- with modern compilers this would be mostly
+ pointless anyway. Trust that we'll either have valid DWARF-2 CFI data
+ or else a valid backchain ... */
+ func = get_frame_func (this_frame);
+ if (!func)
+ return 0;
+
+ /* Try to analyze the prologue. */
+ result = s390_analyze_prologue (gdbarch, func,
+ get_frame_pc (this_frame), &data);
+ if (!result)
+ return 0;
+
+ /* If this was successful, we should have found the instruction that
+ sets the stack pointer register to the previous value of the stack
+ pointer minus the frame size. */
+ if (!pv_is_register (*sp, S390_SP_REGNUM))
+ return 0;
+
+ /* A frame size of zero at this point can mean either a real
+ frameless function, or else a failure to find the prologue.
+ Perform some sanity checks to verify we really have a
+ frameless function. */
+ if (sp->k == 0)
+ {
+ /* If the next frame is a NORMAL_FRAME, this frame *cannot* have frame
+ size zero. This is only possible if the next frame is a sentinel
+ frame, a dummy frame, or a signal trampoline frame. */
+ /* FIXME: cagney/2004-05-01: This sanity check shouldn't be
+ needed, instead the code should simpliy rely on its
+ analysis. */
+ if (get_next_frame (this_frame)
+ && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME)
+ return 0;
+
+ /* If we really have a frameless function, %r14 must be valid
+ -- in particular, it must point to a different function. */
+ reg = get_frame_register_unsigned (this_frame, S390_RETADDR_REGNUM);
+ reg = gdbarch_addr_bits_remove (gdbarch, reg) - 1;
+ if (get_pc_function_start (reg) == func)
+ {
+ /* However, there is one case where it *is* valid for %r14
+ to point to the same function -- if this is a recursive
+ call, and we have stopped in the prologue *before* the
+ stack frame was allocated.
+
+ Recognize this case by looking ahead a bit ... */
+
+ struct s390_prologue_data data2;
+ pv_t *sp = &data2.gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+
+ if (!(s390_analyze_prologue (gdbarch, func, (CORE_ADDR)-1, &data2)
+ && pv_is_register (*sp, S390_SP_REGNUM)
+ && sp->k != 0))
+ return 0;
+ }
+ }
+
+
+ /* OK, we've found valid prologue data. */
+ size = -sp->k;
+
+ /* If the frame pointer originally also holds the same value
+ as the stack pointer, we're probably using it. If it holds
+ some other value -- even a constant offset -- it is most
+ likely used as temp register. */
+ if (pv_is_identical (*sp, *fp))
+ frame_pointer = S390_FRAME_REGNUM;
+ else
+ frame_pointer = S390_SP_REGNUM;
+
+ /* If we've detected a function with stack frame, we'll still have to
+ treat it as frameless if we're currently within the function epilog
+ code at a point where the frame pointer has already been restored.
+ This can only happen in an innermost frame. */
+ /* FIXME: cagney/2004-05-01: This sanity check shouldn't be needed,
+ instead the code should simpliy rely on its analysis. */
+ if (size > 0
+ && (!get_next_frame (this_frame)
+ || get_frame_type (get_next_frame (this_frame)) != NORMAL_FRAME))
+ {
+ /* See the comment in s390_in_function_epilogue_p on why this is
+ not completely reliable ... */
+ if (s390_in_function_epilogue_p (gdbarch, get_frame_pc (this_frame)))
+ {
+ memset (&data, 0, sizeof (data));
+ size = 0;
+ frame_pointer = S390_SP_REGNUM;
+ }
+ }
+
+ /* Once we know the frame register and the frame size, we can unwind
+ the current value of the frame register from the next frame, and
+ add back the frame size to arrive that the previous frame's
+ stack pointer value. */
+ prev_sp = get_frame_register_unsigned (this_frame, frame_pointer) + size;
+ cfa = prev_sp + 16*word_size + 32;
+
+ /* Record the addresses of all register spill slots the prologue parser
+ has recognized. Consider only registers defined as call-saved by the
+ ABI; for call-clobbered registers the parser may have recognized
+ spurious stores. */
+
+ for (i = 6; i <= 15; i++)
+ if (data.gpr_slot[i] != 0)
+ info->saved_regs[S390_R0_REGNUM + i].addr = cfa - data.gpr_slot[i];
+
+ switch (tdep->abi)
+ {
+ case ABI_LINUX_S390:
+ if (data.fpr_slot[4] != 0)
+ info->saved_regs[S390_F4_REGNUM].addr = cfa - data.fpr_slot[4];
+ if (data.fpr_slot[6] != 0)
+ info->saved_regs[S390_F6_REGNUM].addr = cfa - data.fpr_slot[6];
+ break;
+
+ case ABI_LINUX_ZSERIES:
+ for (i = 8; i <= 15; i++)
+ if (data.fpr_slot[i] != 0)
+ info->saved_regs[S390_F0_REGNUM + i].addr = cfa - data.fpr_slot[i];
+ break;
+ }
+
+ /* Function return will set PC to %r14. */
+ info->saved_regs[S390_PC_REGNUM] = info->saved_regs[S390_RETADDR_REGNUM];
+ /* In frameless functions, we unwind simply by moving the return
+ address to the PC. However, if we actually stored to the
+ save area, use that -- we might only think the function frameless
+ because we're in the middle of the prologue ... */
+ if (size == 0
+ && !trad_frame_addr_p (info->saved_regs, S390_PC_REGNUM))
+ {
+ info->saved_regs[S390_PC_REGNUM].realreg = S390_RETADDR_REGNUM;
+ }
-int
-s390_frameless_function_invocation (struct frame_info *fi)
-{
- struct frame_extra_info fextra_info, *fextra_info_ptr;
- int frameless = 0;
+ /* Another sanity check: unless this is a frameless function,
+ we should have found spill slots for SP and PC.
+ If not, we cannot unwind further -- this happens e.g. in
+ libc's thread_start routine. */
+ if (size > 0)
+ {
+ if (!trad_frame_addr_p (info->saved_regs, S390_SP_REGNUM)
+ || !trad_frame_addr_p (info->saved_regs, S390_PC_REGNUM))
+ prev_sp = -1;
+ }
- if (get_next_frame (fi) == NULL) /* no may be frameless */
+ /* We use the current value of the frame register as local_base,
+ and the top of the register save area as frame_base. */
+ if (prev_sp != -1)
{
- if (get_frame_extra_info (fi))
- fextra_info_ptr = get_frame_extra_info (fi);
- else
- {
- fextra_info_ptr = &fextra_info;
- s390_get_frame_info (s390_sniff_pc_function_start (get_frame_pc (fi), fi),
- fextra_info_ptr, fi, 1);
- }
- frameless = ((fextra_info_ptr->stack_bought == 0));
+ info->frame_base = prev_sp + 16*word_size + 32;
+ info->local_base = prev_sp - size;
}
- return frameless;
+ info->func = func;
+ return 1;
}
-
-static int
-s390_is_sigreturn (CORE_ADDR pc, struct frame_info *sighandler_fi,
- CORE_ADDR *sregs, CORE_ADDR *sigcaller_pc)
+static void
+s390_backchain_frame_unwind_cache (struct frame_info *this_frame,
+ struct s390_unwind_cache *info)
{
- bfd_byte instr[S390_MAX_INSTR_SIZE];
- disassemble_info info;
- int instrlen;
- CORE_ADDR scontext;
- int retval = 0;
- CORE_ADDR orig_sp;
- CORE_ADDR temp_sregs;
-
- scontext = temp_sregs = 0;
-
- info.read_memory_func = deprecated_tm_print_insn_info.read_memory_func;
- instrlen = s390_readinstruction (instr, pc, &info);
- if (sigcaller_pc)
- *sigcaller_pc = 0;
- if (((instrlen == S390_SYSCALL_SIZE) &&
- (instr[0] == S390_SYSCALL_OPCODE)) &&
- ((instr[1] == s390_NR_sigreturn) || (instr[1] == s390_NR_rt_sigreturn)))
- {
- if (sighandler_fi)
- {
- if (s390_frameless_function_invocation (sighandler_fi))
- orig_sp = get_frame_base (sighandler_fi);
- else
- orig_sp = ADDR_BITS_REMOVE ((CORE_ADDR)
- read_memory_integer (get_frame_base (sighandler_fi),
- S390_GPR_SIZE));
- if (orig_sp && sigcaller_pc)
- {
- scontext = orig_sp + S390_SIGNAL_FRAMESIZE;
- if (pc == scontext && instr[1] == s390_NR_rt_sigreturn)
- {
- /* We got a new style rt_signal */
- /* get address of read ucontext->uc_mcontext */
- temp_sregs = orig_sp + (GDB_TARGET_IS_ESAME ?
- S390X_UC_MCONTEXT_OFFSET :
- S390_UC_MCONTEXT_OFFSET);
- }
- else
- {
- /* read sigcontext->sregs */
- temp_sregs = ADDR_BITS_REMOVE ((CORE_ADDR)
- read_memory_integer (scontext
- +
- (GDB_TARGET_IS_ESAME
- ?
- S390X_SIGCONTEXT_SREGS_OFFSET
- :
- S390_SIGCONTEXT_SREGS_OFFSET),
- S390_GPR_SIZE));
-
- }
- /* read sigregs->psw.addr */
- *sigcaller_pc =
- ADDR_BITS_REMOVE ((CORE_ADDR)
- read_memory_integer (temp_sregs +
- REGISTER_BYTE
- (S390_PC_REGNUM),
- S390_PSW_ADDR_SIZE));
- }
- }
- retval = 1;
- }
- if (sregs)
- *sregs = temp_sregs;
- return retval;
-}
-
-/*
- We need to do something better here but this will keep us out of trouble
- for the moment.
- For some reason the blockframe.c calls us with fi->next->fromleaf
- so this seems of little use to us. */
-CORE_ADDR
-s390_init_frame_pc_first (int next_fromleaf, struct frame_info *fi)
-{
- CORE_ADDR sigcaller_pc;
- CORE_ADDR pc = 0;
- if (next_fromleaf)
- {
- pc = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM));
- /* fix signal handlers */
- }
- else if (get_next_frame (fi) && get_frame_pc (get_next_frame (fi)))
- pc = s390_frame_saved_pc_nofix (get_next_frame (fi));
- if (pc && get_next_frame (fi) && get_frame_base (get_next_frame (fi))
- && s390_is_sigreturn (pc, get_next_frame (fi), NULL, &sigcaller_pc))
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ CORE_ADDR backchain;
+ ULONGEST reg;
+ LONGEST sp;
+
+ /* Get the backchain. */
+ reg = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
+ backchain = read_memory_unsigned_integer (reg, word_size);
+
+ /* A zero backchain terminates the frame chain. As additional
+ sanity check, let's verify that the spill slot for SP in the
+ save area pointed to by the backchain in fact links back to
+ the save area. */
+ if (backchain != 0
+ && safe_read_memory_integer (backchain + 15*word_size, word_size, &sp)
+ && (CORE_ADDR)sp == backchain)
{
- pc = sigcaller_pc;
+ /* We don't know which registers were saved, but it will have
+ to be at least %r14 and %r15. This will allow us to continue
+ unwinding, but other prev-frame registers may be incorrect ... */
+ info->saved_regs[S390_SP_REGNUM].addr = backchain + 15*word_size;
+ info->saved_regs[S390_RETADDR_REGNUM].addr = backchain + 14*word_size;
+
+ /* Function return will set PC to %r14. */
+ info->saved_regs[S390_PC_REGNUM] = info->saved_regs[S390_RETADDR_REGNUM];
+
+ /* We use the current value of the frame register as local_base,
+ and the top of the register save area as frame_base. */
+ info->frame_base = backchain + 16*word_size + 32;
+ info->local_base = reg;
}
- return pc;
+
+ info->func = get_frame_pc (this_frame);
}
-void
-s390_init_extra_frame_info (int fromleaf, struct frame_info *fi)
+static struct s390_unwind_cache *
+s390_frame_unwind_cache (struct frame_info *this_frame,
+ void **this_prologue_cache)
{
- frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info));
- if (get_frame_pc (fi))
- s390_get_frame_info (s390_sniff_pc_function_start (get_frame_pc (fi), fi),
- get_frame_extra_info (fi), fi, 1);
- else
- s390_memset_extra_info (get_frame_extra_info (fi));
+ struct s390_unwind_cache *info;
+ if (*this_prologue_cache)
+ return *this_prologue_cache;
+
+ info = FRAME_OBSTACK_ZALLOC (struct s390_unwind_cache);
+ *this_prologue_cache = info;
+ info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
+ info->func = -1;
+ info->frame_base = -1;
+ info->local_base = -1;
+
+ /* Try to use prologue analysis to fill the unwind cache.
+ If this fails, fall back to reading the stack backchain. */
+ if (!s390_prologue_frame_unwind_cache (this_frame, info))
+ s390_backchain_frame_unwind_cache (this_frame, info);
+
+ return info;
}
-/* If saved registers of frame FI are not known yet, read and cache them.
- &FEXTRA_INFOP contains struct frame_extra_info; TDATAP can be NULL,
- in which case the framedata are read. */
-
-void
-s390_frame_init_saved_regs (struct frame_info *fi)
+static void
+s390_frame_this_id (struct frame_info *this_frame,
+ void **this_prologue_cache,
+ struct frame_id *this_id)
{
+ struct s390_unwind_cache *info
+ = s390_frame_unwind_cache (this_frame, this_prologue_cache);
- int quick;
+ if (info->frame_base == -1)
+ return;
- if (get_frame_saved_regs (fi) == NULL)
- {
- /* zalloc memsets the saved regs */
- frame_saved_regs_zalloc (fi);
- if (get_frame_pc (fi))
- {
- quick = (get_frame_extra_info (fi)
- && get_frame_extra_info (fi)->initialised
- && get_frame_extra_info (fi)->good_prologue);
- s390_get_frame_info (quick
- ? get_frame_extra_info (fi)->function_start
- : s390_sniff_pc_function_start (get_frame_pc (fi), fi),
- get_frame_extra_info (fi), fi, !quick);
- }
- }
+ *this_id = frame_id_build (info->frame_base, info->func);
}
+static struct value *
+s390_frame_prev_register (struct frame_info *this_frame,
+ void **this_prologue_cache, int regnum)
+{
+ struct s390_unwind_cache *info
+ = s390_frame_unwind_cache (this_frame, this_prologue_cache);
+ return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
+}
+static const struct frame_unwind s390_frame_unwind = {
+ NORMAL_FRAME,
+ s390_frame_this_id,
+ s390_frame_prev_register,
+ NULL,
+ default_frame_sniffer
+};
-CORE_ADDR
-s390_frame_args_address (struct frame_info *fi)
-{
- /* Apparently gdb already knows gdb_args_offset itself */
- return get_frame_base (fi);
-}
+/* Code stubs and their stack frames. For things like PLTs and NULL
+ function calls (where there is no true frame and the return address
+ is in the RETADDR register). */
+struct s390_stub_unwind_cache
+{
+ CORE_ADDR frame_base;
+ struct trad_frame_saved_reg *saved_regs;
+};
-static CORE_ADDR
-s390_frame_saved_pc_nofix (struct frame_info *fi)
+static struct s390_stub_unwind_cache *
+s390_stub_frame_unwind_cache (struct frame_info *this_frame,
+ void **this_prologue_cache)
{
- if (get_frame_extra_info (fi) && get_frame_extra_info (fi)->saved_pc_valid)
- return get_frame_extra_info (fi)->saved_pc;
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ struct s390_stub_unwind_cache *info;
+ ULONGEST reg;
- if (deprecated_generic_find_dummy_frame (get_frame_pc (fi),
- get_frame_base (fi)))
- return deprecated_read_register_dummy (get_frame_pc (fi),
- get_frame_base (fi), S390_PC_REGNUM);
+ if (*this_prologue_cache)
+ return *this_prologue_cache;
- s390_frame_init_saved_regs (fi);
- if (get_frame_extra_info (fi))
- {
- get_frame_extra_info (fi)->saved_pc_valid = 1;
- if (get_frame_extra_info (fi)->good_prologue
- && get_frame_saved_regs (fi)[S390_RETADDR_REGNUM])
- get_frame_extra_info (fi)->saved_pc
- = ADDR_BITS_REMOVE (read_memory_integer
- (get_frame_saved_regs (fi)[S390_RETADDR_REGNUM],
- S390_GPR_SIZE));
- else
- get_frame_extra_info (fi)->saved_pc
- = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM));
- return get_frame_extra_info (fi)->saved_pc;
- }
- return 0;
+ info = FRAME_OBSTACK_ZALLOC (struct s390_stub_unwind_cache);
+ *this_prologue_cache = info;
+ info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
+
+ /* The return address is in register %r14. */
+ info->saved_regs[S390_PC_REGNUM].realreg = S390_RETADDR_REGNUM;
+
+ /* Retrieve stack pointer and determine our frame base. */
+ reg = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
+ info->frame_base = reg + 16*word_size + 32;
+
+ return info;
}
-CORE_ADDR
-s390_frame_saved_pc (struct frame_info *fi)
+static void
+s390_stub_frame_this_id (struct frame_info *this_frame,
+ void **this_prologue_cache,
+ struct frame_id *this_id)
{
- CORE_ADDR saved_pc = 0, sig_pc;
+ struct s390_stub_unwind_cache *info
+ = s390_stub_frame_unwind_cache (this_frame, this_prologue_cache);
+ *this_id = frame_id_build (info->frame_base, get_frame_pc (this_frame));
+}
- if (get_frame_extra_info (fi)
- && get_frame_extra_info (fi)->sig_fixed_saved_pc_valid)
- return get_frame_extra_info (fi)->sig_fixed_saved_pc;
- saved_pc = s390_frame_saved_pc_nofix (fi);
+static struct value *
+s390_stub_frame_prev_register (struct frame_info *this_frame,
+ void **this_prologue_cache, int regnum)
+{
+ struct s390_stub_unwind_cache *info
+ = s390_stub_frame_unwind_cache (this_frame, this_prologue_cache);
+ return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
+}
- if (get_frame_extra_info (fi))
- {
- get_frame_extra_info (fi)->sig_fixed_saved_pc_valid = 1;
- if (saved_pc)
- {
- if (s390_is_sigreturn (saved_pc, fi, NULL, &sig_pc))
- saved_pc = sig_pc;
- }
- get_frame_extra_info (fi)->sig_fixed_saved_pc = saved_pc;
- }
- return saved_pc;
+static int
+s390_stub_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_prologue_cache)
+{
+ CORE_ADDR addr_in_block;
+ bfd_byte insn[S390_MAX_INSTR_SIZE];
+
+ /* If the current PC points to non-readable memory, we assume we
+ have trapped due to an invalid function pointer call. We handle
+ the non-existing current function like a PLT stub. */
+ addr_in_block = get_frame_address_in_block (this_frame);
+ if (in_plt_section (addr_in_block, NULL)
+ || s390_readinstruction (insn, get_frame_pc (this_frame)) < 0)
+ return 1;
+ return 0;
}
+static const struct frame_unwind s390_stub_frame_unwind = {
+ NORMAL_FRAME,
+ s390_stub_frame_this_id,
+ s390_stub_frame_prev_register,
+ NULL,
+ s390_stub_frame_sniffer
+};
+/* Signal trampoline stack frames. */
-/* We want backtraces out of signal handlers so we don't set
- (get_frame_type (thisframe) == SIGTRAMP_FRAME) to 1 */
+struct s390_sigtramp_unwind_cache {
+ CORE_ADDR frame_base;
+ struct trad_frame_saved_reg *saved_regs;
+};
-CORE_ADDR
-s390_frame_chain (struct frame_info *thisframe)
+static struct s390_sigtramp_unwind_cache *
+s390_sigtramp_frame_unwind_cache (struct frame_info *this_frame,
+ void **this_prologue_cache)
{
- CORE_ADDR prev_fp = 0;
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ struct s390_sigtramp_unwind_cache *info;
+ ULONGEST this_sp, prev_sp;
+ CORE_ADDR next_ra, next_cfa, sigreg_ptr;
+ int i;
- if (deprecated_generic_find_dummy_frame (get_frame_pc (thisframe),
- get_frame_base (thisframe)))
- return deprecated_read_register_dummy (get_frame_pc (thisframe),
- get_frame_base (thisframe),
- S390_SP_REGNUM);
- else
- {
- int sigreturn = 0;
- CORE_ADDR sregs = 0;
- struct frame_extra_info prev_fextra_info;
+ if (*this_prologue_cache)
+ return *this_prologue_cache;
- memset (&prev_fextra_info, 0, sizeof (prev_fextra_info));
- if (get_frame_pc (thisframe))
- {
- CORE_ADDR saved_pc, sig_pc;
+ info = FRAME_OBSTACK_ZALLOC (struct s390_sigtramp_unwind_cache);
+ *this_prologue_cache = info;
+ info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
- saved_pc = s390_frame_saved_pc_nofix (thisframe);
- if (saved_pc)
- {
- if ((sigreturn =
- s390_is_sigreturn (saved_pc, thisframe, &sregs, &sig_pc)))
- saved_pc = sig_pc;
- s390_get_frame_info (s390_sniff_pc_function_start
- (saved_pc, NULL), &prev_fextra_info, NULL,
- 1);
- }
- }
- if (sigreturn)
- {
- /* read sigregs,regs.gprs[11 or 15] */
- prev_fp = read_memory_integer (sregs +
- REGISTER_BYTE (S390_GP0_REGNUM +
- (prev_fextra_info.
- frame_pointer_saved_pc
- ? 11 : 15)),
- S390_GPR_SIZE);
- get_frame_extra_info (thisframe)->sigcontext = sregs;
- }
- else
- {
- if (get_frame_saved_regs (thisframe))
- {
- int regno;
-
- if (prev_fextra_info.frame_pointer_saved_pc
- && get_frame_saved_regs (thisframe)[S390_FRAME_REGNUM])
- regno = S390_FRAME_REGNUM;
- else
- regno = S390_SP_REGNUM;
-
- if (get_frame_saved_regs (thisframe)[regno])
- {
- /* The SP's entry of `saved_regs' is special. */
- if (regno == S390_SP_REGNUM)
- prev_fp = get_frame_saved_regs (thisframe)[regno];
- else
- prev_fp =
- read_memory_integer (get_frame_saved_regs (thisframe)[regno],
- S390_GPR_SIZE);
- }
- }
- }
+ this_sp = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
+ next_ra = get_frame_pc (this_frame);
+ next_cfa = this_sp + 16*word_size + 32;
+
+ /* New-style RT frame:
+ retcode + alignment (8 bytes)
+ siginfo (128 bytes)
+ ucontext (contains sigregs at offset 5 words) */
+ if (next_ra == next_cfa)
+ {
+ sigreg_ptr = next_cfa + 8 + 128 + align_up (5*word_size, 8);
}
- return ADDR_BITS_REMOVE (prev_fp);
-}
-/*
- Whether struct frame_extra_info is actually needed I'll have to figure
- out as our frames are similar to rs6000 there is a possibility
- i386 dosen't need it. */
+ /* Old-style RT frame and all non-RT frames:
+ old signal mask (8 bytes)
+ pointer to sigregs */
+ else
+ {
+ sigreg_ptr = read_memory_unsigned_integer (next_cfa + 8, word_size);
+ }
+ /* The sigregs structure looks like this:
+ long psw_mask;
+ long psw_addr;
+ long gprs[16];
+ int acrs[16];
+ int fpc;
+ int __pad;
+ double fprs[16]; */
+ /* Let's ignore the PSW mask, it will not be restored anyway. */
+ sigreg_ptr += word_size;
-/* a given return value in `regbuf' with a type `valtype', extract and copy its
- value into `valbuf' */
-void
-s390_extract_return_value (struct type *valtype, char *regbuf, char *valbuf)
-{
- /* floats and doubles are returned in fpr0. fpr's have a size of 8 bytes.
- We need to truncate the return value into float size (4 byte) if
- necessary. */
- int len = TYPE_LENGTH (valtype);
+ /* Next comes the PSW address. */
+ info->saved_regs[S390_PC_REGNUM].addr = sigreg_ptr;
+ sigreg_ptr += word_size;
- if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
- memcpy (valbuf, ®buf[REGISTER_BYTE (S390_FP0_REGNUM)], len);
- else
+ /* Then the GPRs. */
+ for (i = 0; i < 16; i++)
{
- int offset = 0;
- /* return value is copied starting from r2. */
- if (TYPE_LENGTH (valtype) < S390_GPR_SIZE)
- offset = S390_GPR_SIZE - TYPE_LENGTH (valtype);
- memcpy (valbuf,
- regbuf + REGISTER_BYTE (S390_GP0_REGNUM + 2) + offset,
- TYPE_LENGTH (valtype));
+ info->saved_regs[S390_R0_REGNUM + i].addr = sigreg_ptr;
+ sigreg_ptr += word_size;
}
-}
-
-
-static char *
-s390_promote_integer_argument (struct type *valtype, char *valbuf,
- char *reg_buff, int *arglen)
-{
- char *value = valbuf;
- int len = TYPE_LENGTH (valtype);
- if (len < S390_GPR_SIZE)
+ /* Then the ACRs. */
+ for (i = 0; i < 16; i++)
{
- /* We need to upgrade this value to a register to pass it correctly */
- int idx, diff = S390_GPR_SIZE - len, negative =
- (!TYPE_UNSIGNED (valtype) && value[0] & 0x80);
- for (idx = 0; idx < S390_GPR_SIZE; idx++)
- {
- reg_buff[idx] = (idx < diff ? (negative ? 0xff : 0x0) :
- value[idx - diff]);
- }
- value = reg_buff;
- *arglen = S390_GPR_SIZE;
+ info->saved_regs[S390_A0_REGNUM + i].addr = sigreg_ptr;
+ sigreg_ptr += 4;
}
- else
+
+ /* The floating-point control word. */
+ info->saved_regs[S390_FPC_REGNUM].addr = sigreg_ptr;
+ sigreg_ptr += 8;
+
+ /* And finally the FPRs. */
+ for (i = 0; i < 16; i++)
{
- if (len & (S390_GPR_SIZE - 1))
- {
- fprintf_unfiltered (gdb_stderr,
- "s390_promote_integer_argument detected an argument not "
- "a multiple of S390_GPR_SIZE & greater than S390_GPR_SIZE "
- "we might not deal with this correctly.\n");
- }
- *arglen = len;
+ info->saved_regs[S390_F0_REGNUM + i].addr = sigreg_ptr;
+ sigreg_ptr += 8;
}
- return (value);
+ /* Restore the previous frame's SP. */
+ prev_sp = read_memory_unsigned_integer (
+ info->saved_regs[S390_SP_REGNUM].addr,
+ word_size);
+
+ /* Determine our frame base. */
+ info->frame_base = prev_sp + 16*word_size + 32;
+
+ return info;
}
-void
-s390_store_return_value (struct type *valtype, char *valbuf)
+static void
+s390_sigtramp_frame_this_id (struct frame_info *this_frame,
+ void **this_prologue_cache,
+ struct frame_id *this_id)
{
- int arglen;
- char *reg_buff = alloca (max (S390_FPR_SIZE, DEPRECATED_REGISTER_SIZE)), *value;
+ struct s390_sigtramp_unwind_cache *info
+ = s390_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
+ *this_id = frame_id_build (info->frame_base, get_frame_pc (this_frame));
+}
- if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
- {
- if (TYPE_LENGTH (valtype) == 4
- || TYPE_LENGTH (valtype) == 8)
- deprecated_write_register_bytes (REGISTER_BYTE (S390_FP0_REGNUM),
- valbuf, TYPE_LENGTH (valtype));
- else
- error ("GDB is unable to return `long double' values "
- "on this architecture.");
- }
- else
- {
- value =
- s390_promote_integer_argument (valtype, valbuf, reg_buff, &arglen);
- /* Everything else is returned in GPR2 and up. */
- deprecated_write_register_bytes (REGISTER_BYTE (S390_GP0_REGNUM + 2),
- value, arglen);
- }
+static struct value *
+s390_sigtramp_frame_prev_register (struct frame_info *this_frame,
+ void **this_prologue_cache, int regnum)
+{
+ struct s390_sigtramp_unwind_cache *info
+ = s390_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
+ return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
}
+
static int
-gdb_print_insn_s390 (bfd_vma memaddr, disassemble_info * info)
+s390_sigtramp_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_prologue_cache)
{
- bfd_byte instrbuff[S390_MAX_INSTR_SIZE];
- int instrlen, cnt;
+ CORE_ADDR pc = get_frame_pc (this_frame);
+ bfd_byte sigreturn[2];
- instrlen = s390_readinstruction (instrbuff, (CORE_ADDR) memaddr, info);
- if (instrlen < 0)
- {
- (*info->memory_error_func) (instrlen, memaddr, info);
- return -1;
- }
- for (cnt = 0; cnt < instrlen; cnt++)
- info->fprintf_func (info->stream, "%02X ", instrbuff[cnt]);
- for (cnt = instrlen; cnt < S390_MAX_INSTR_SIZE; cnt++)
- info->fprintf_func (info->stream, " ");
- instrlen = print_insn_s390 (memaddr, info);
- return instrlen;
+ if (target_read_memory (pc, sigreturn, 2))
+ return 0;
+
+ if (sigreturn[0] != 0x0a /* svc */)
+ return 0;
+
+ if (sigreturn[1] != 119 /* sigreturn */
+ && sigreturn[1] != 173 /* rt_sigreturn */)
+ return 0;
+
+ return 1;
}
+static const struct frame_unwind s390_sigtramp_frame_unwind = {
+ SIGTRAMP_FRAME,
+ s390_sigtramp_frame_this_id,
+ s390_sigtramp_frame_prev_register,
+ NULL,
+ s390_sigtramp_frame_sniffer
+};
+
+/* Frame base handling. */
-/* Not the most efficent code in the world */
-int
-s390_fp_regnum (void)
+static CORE_ADDR
+s390_frame_base_address (struct frame_info *this_frame, void **this_cache)
+{
+ struct s390_unwind_cache *info
+ = s390_frame_unwind_cache (this_frame, this_cache);
+ return info->frame_base;
+}
+
+static CORE_ADDR
+s390_local_base_address (struct frame_info *this_frame, void **this_cache)
{
- int regno = S390_SP_REGNUM;
- struct frame_extra_info fextra_info;
+ struct s390_unwind_cache *info
+ = s390_frame_unwind_cache (this_frame, this_cache);
+ return info->local_base;
+}
- CORE_ADDR pc = ADDR_BITS_REMOVE (read_register (S390_PC_REGNUM));
+static const struct frame_base s390_frame_base = {
+ &s390_frame_unwind,
+ s390_frame_base_address,
+ s390_local_base_address,
+ s390_local_base_address
+};
- s390_get_frame_info (s390_sniff_pc_function_start (pc, NULL), &fextra_info,
- NULL, 1);
- if (fextra_info.frame_pointer_saved_pc)
- regno = S390_FRAME_REGNUM;
- return regno;
+static CORE_ADDR
+s390_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ ULONGEST pc;
+ pc = frame_unwind_register_unsigned (next_frame, S390_PC_REGNUM);
+ return gdbarch_addr_bits_remove (gdbarch, pc);
}
-CORE_ADDR
-s390_read_fp (void)
+static CORE_ADDR
+s390_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
- return read_register (s390_fp_regnum ());
+ ULONGEST sp;
+ sp = frame_unwind_register_unsigned (next_frame, S390_SP_REGNUM);
+ return gdbarch_addr_bits_remove (gdbarch, sp);
}
+/* DWARF-2 frame support. */
+
static void
-s390_pop_frame_regular (struct frame_info *frame)
+s390_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
+ struct dwarf2_frame_state_reg *reg,
+ struct frame_info *this_frame)
{
- int regnum;
-
- write_register (S390_PC_REGNUM, DEPRECATED_FRAME_SAVED_PC (frame));
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- /* Restore any saved registers. */
- if (get_frame_saved_regs (frame))
+ switch (tdep->abi)
{
- for (regnum = 0; regnum < NUM_REGS; regnum++)
- if (get_frame_saved_regs (frame)[regnum] != 0)
- {
- ULONGEST value;
-
- value = read_memory_unsigned_integer (get_frame_saved_regs (frame)[regnum],
- REGISTER_RAW_SIZE (regnum));
- write_register (regnum, value);
- }
-
- /* Actually cut back the stack. Remember that the SP's element of
- saved_regs is the old SP itself, not the address at which it is
- saved. */
- write_register (S390_SP_REGNUM, get_frame_saved_regs (frame)[S390_SP_REGNUM]);
- }
+ case ABI_LINUX_S390:
+ /* Call-saved registers. */
+ if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)
+ || regnum == S390_F4_REGNUM
+ || regnum == S390_F6_REGNUM)
+ reg->how = DWARF2_FRAME_REG_SAME_VALUE;
+
+ /* Call-clobbered registers. */
+ else if ((regnum >= S390_R0_REGNUM && regnum <= S390_R5_REGNUM)
+ || (regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM
+ && regnum != S390_F4_REGNUM && regnum != S390_F6_REGNUM))
+ reg->how = DWARF2_FRAME_REG_UNDEFINED;
+
+ /* The return address column. */
+ else if (regnum == S390_PC_REGNUM)
+ reg->how = DWARF2_FRAME_REG_RA;
+ break;
- /* Throw away any cached frame information. */
- flush_cached_frames ();
-}
+ case ABI_LINUX_ZSERIES:
+ /* Call-saved registers. */
+ if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)
+ || (regnum >= S390_F8_REGNUM && regnum <= S390_F15_REGNUM))
+ reg->how = DWARF2_FRAME_REG_SAME_VALUE;
+ /* Call-clobbered registers. */
+ else if ((regnum >= S390_R0_REGNUM && regnum <= S390_R5_REGNUM)
+ || (regnum >= S390_F0_REGNUM && regnum <= S390_F7_REGNUM))
+ reg->how = DWARF2_FRAME_REG_UNDEFINED;
-/* Destroy the innermost (Top-Of-Stack) stack frame, restoring the
- machine state that was in effect before the frame was created.
- Used in the contexts of the "return" command, and of
- target function calls from the debugger. */
-void
-s390_pop_frame (void)
-{
- /* This function checks for and handles generic dummy frames, and
- calls back to our function for ordinary frames. */
- generic_pop_current_frame (s390_pop_frame_regular);
+ /* The return address column. */
+ else if (regnum == S390_PC_REGNUM)
+ reg->how = DWARF2_FRAME_REG_RA;
+ break;
+ }
}
+/* Dummy function calls. */
+
/* Return non-zero if TYPE is an integer-like type, zero otherwise.
"Integer-like" types are those that should be passed the way
integers are: integers, enums, ranges, characters, and booleans. */
@@ -1275,7 +1774,6 @@ is_integer_like (struct type *type)
|| code == TYPE_CODE_BOOL);
}
-
/* Return non-zero if TYPE is a pointer-like type, zero otherwise.
"Pointer-like" types are those that should be passed the way
pointers are: pointers and references. */
@@ -1302,17 +1800,22 @@ is_pointer_like (struct type *type)
... and so on.
- WHY THE HECK DO WE CARE ABOUT THIS??? Well, it turns out that GCC
- passes all float singletons and double singletons as if they were
- simply floats or doubles. This is *not* what the ABI says it
- should do. */
+ All such structures are passed as if they were floats or doubles,
+ as the (revised) ABI says. */
static int
is_float_singleton (struct type *type)
{
- return (TYPE_CODE (type) == TYPE_CODE_STRUCT
- && TYPE_NFIELDS (type) == 1
- && (TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_FLT
- || is_float_singleton (TYPE_FIELD_TYPE (type, 0))));
+ if (TYPE_CODE (type) == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1)
+ {
+ struct type *singleton_type = TYPE_FIELD_TYPE (type, 0);
+ CHECK_TYPEDEF (singleton_type);
+
+ return (TYPE_CODE (singleton_type) == TYPE_CODE_FLT
+ || TYPE_CODE (singleton_type) == TYPE_CODE_DECFLOAT
+ || is_float_singleton (singleton_type));
+ }
+
+ return 0;
}
@@ -1341,116 +1844,81 @@ is_struct_like (struct type *type)
You'd think this would just be floats, doubles, long doubles, etc.
But as an odd quirk, not mentioned in the ABI, GCC passes float and
double singletons as if they were a plain float, double, etc. (The
- corresponding union types are handled normally.) So we exclude
+ corresponding union types are handled normally.) So we include
those types here. *shrug* */
static int
is_float_like (struct type *type)
{
return (TYPE_CODE (type) == TYPE_CODE_FLT
+ || TYPE_CODE (type) == TYPE_CODE_DECFLOAT
|| is_float_singleton (type));
}
-/* Return non-zero if TYPE is considered a `DOUBLE_OR_FLOAT', as
- defined by the parameter passing conventions described in the
- "GNU/Linux for S/390 ELF Application Binary Interface Supplement".
- Otherwise, return zero. */
static int
-is_double_or_float (struct type *type)
+is_power_of_two (unsigned int n)
{
- return (is_float_like (type)
- && (TYPE_LENGTH (type) == 4
- || TYPE_LENGTH (type) == 8));
+ return ((n & (n - 1)) == 0);
}
-
-/* Return non-zero if TYPE is considered a `SIMPLE_ARG', as defined by
- the parameter passing conventions described in the "GNU/Linux for
- S/390 ELF Application Binary Interface Supplement". Return zero
- otherwise. */
+/* Return non-zero if TYPE should be passed as a pointer to a copy,
+ zero otherwise. */
static int
-is_simple_arg (struct type *type)
+s390_function_arg_pass_by_reference (struct type *type)
{
unsigned length = TYPE_LENGTH (type);
+ if (length > 8)
+ return 1;
- /* This is almost a direct translation of the ABI's language, except
- that we have to exclude 8-byte structs; those are DOUBLE_ARGs. */
- return ((is_integer_like (type) && length <= 4)
- || is_pointer_like (type)
- || (is_struct_like (type) && length != 8)
- || (is_float_like (type) && length == 16));
+ /* FIXME: All complex and vector types are also returned by reference. */
+ return is_struct_like (type) && !is_power_of_two (length);
}
-
-/* Return non-zero if TYPE should be passed as a pointer to a copy,
- zero otherwise. TYPE must be a SIMPLE_ARG, as recognized by
- `is_simple_arg'. */
+/* Return non-zero if TYPE should be passed in a float register
+ if possible. */
static int
-pass_by_copy_ref (struct type *type)
+s390_function_arg_float (struct type *type)
{
unsigned length = TYPE_LENGTH (type);
+ if (length > 8)
+ return 0;
- return ((is_struct_like (type) && length != 1 && length != 2 && length != 4)
- || (is_float_like (type) && length == 16));
+ return is_float_like (type);
}
+/* Return non-zero if TYPE should be passed in an integer register
+ (or a pair of integer registers) if possible. */
+static int
+s390_function_arg_integer (struct type *type)
+{
+ unsigned length = TYPE_LENGTH (type);
+ if (length > 8)
+ return 0;
+
+ return is_integer_like (type)
+ || is_pointer_like (type)
+ || (is_struct_like (type) && is_power_of_two (length));
+}
/* Return ARG, a `SIMPLE_ARG', sign-extended or zero-extended to a full
word as required for the ABI. */
static LONGEST
extend_simple_arg (struct value *arg)
{
- struct type *type = VALUE_TYPE (arg);
+ struct type *type = value_type (arg);
/* Even structs get passed in the least significant bits of the
register / memory word. It's not really right to extract them as
an integer, but it does take care of the extension. */
if (TYPE_UNSIGNED (type))
- return extract_unsigned_integer (VALUE_CONTENTS (arg),
+ return extract_unsigned_integer (value_contents (arg),
TYPE_LENGTH (type));
else
- return extract_signed_integer (VALUE_CONTENTS (arg),
+ return extract_signed_integer (value_contents (arg),
TYPE_LENGTH (type));
}
-/* Return non-zero if TYPE is a `DOUBLE_ARG', as defined by the
- parameter passing conventions described in the "GNU/Linux for S/390
- ELF Application Binary Interface Supplement". Return zero
- otherwise. */
-static int
-is_double_arg (struct type *type)
-{
- unsigned length = TYPE_LENGTH (type);
-
- return ((is_integer_like (type)
- || is_struct_like (type))
- && length == 8);
-}
-
-
-/* Round ADDR up to the next N-byte boundary. N must be a power of
- two. */
-static CORE_ADDR
-round_up (CORE_ADDR addr, int n)
-{
- /* Check that N is really a power of two. */
- gdb_assert (n && (n & (n-1)) == 0);
- return ((addr + n - 1) & -n);
-}
-
-
-/* Round ADDR down to the next N-byte boundary. N must be a power of
- two. */
-static CORE_ADDR
-round_down (CORE_ADDR addr, int n)
-{
- /* Check that N is really a power of two. */
- gdb_assert (n && (n & (n-1)) == 0);
- return (addr & -n);
-}
-
-
/* Return the alignment required by TYPE. */
static int
alignment_of (struct type *type)
@@ -1459,7 +1927,8 @@ alignment_of (struct type *type)
if (is_integer_like (type)
|| is_pointer_like (type)
- || TYPE_CODE (type) == TYPE_CODE_FLT)
+ || TYPE_CODE (type) == TYPE_CODE_FLT
+ || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
alignment = TYPE_LENGTH (type);
else if (TYPE_CODE (type) == TYPE_CODE_STRUCT
|| TYPE_CODE (type) == TYPE_CODE_UNION)
@@ -1501,67 +1970,46 @@ alignment_of (struct type *type)
Our caller has taken care of any type promotions needed to satisfy
prototypes or the old K&R argument-passing rules. */
-CORE_ADDR
-s390_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
- int struct_return, CORE_ADDR struct_addr)
+static CORE_ADDR
+s390_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
+ struct regcache *regcache, CORE_ADDR bp_addr,
+ int nargs, struct value **args, CORE_ADDR sp,
+ int struct_return, CORE_ADDR struct_addr)
{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ ULONGEST orig_sp;
int i;
- int pointer_size = (TARGET_PTR_BIT / TARGET_CHAR_BIT);
-
- /* The number of arguments passed by reference-to-copy. */
- int num_copies;
/* If the i'th argument is passed as a reference to a copy, then
copy_addr[i] is the address of the copy we made. */
CORE_ADDR *copy_addr = alloca (nargs * sizeof (CORE_ADDR));
/* Build the reference-to-copy area. */
- num_copies = 0;
for (i = 0; i < nargs; i++)
{
struct value *arg = args[i];
- struct type *type = VALUE_TYPE (arg);
+ struct type *type = value_type (arg);
unsigned length = TYPE_LENGTH (type);
- if (is_simple_arg (type)
- && pass_by_copy_ref (type))
+ if (s390_function_arg_pass_by_reference (type))
{
sp -= length;
- sp = round_down (sp, alignment_of (type));
- write_memory (sp, VALUE_CONTENTS (arg), length);
+ sp = align_down (sp, alignment_of (type));
+ write_memory (sp, value_contents (arg), length);
copy_addr[i] = sp;
- num_copies++;
}
}
/* Reserve space for the parameter area. As a conservative
simplification, we assume that everything will be passed on the
- stack. */
- {
- int i;
-
- for (i = 0; i < nargs; i++)
- {
- struct value *arg = args[i];
- struct type *type = VALUE_TYPE (arg);
- int length = TYPE_LENGTH (type);
-
- sp = round_down (sp, alignment_of (type));
-
- /* SIMPLE_ARG values get extended to 32 bits. Assume every
- argument is. */
- if (length < 4) length = 4;
- sp -= length;
- }
- }
+ stack. Since every argument larger than 8 bytes will be
+ passed by reference, we use this simple upper bound. */
+ sp -= nargs * 8;
- /* Include space for any reference-to-copy pointers. */
- sp = round_down (sp, pointer_size);
- sp -= num_copies * pointer_size;
-
/* After all that, make sure it's still aligned on an eight-byte
boundary. */
- sp = round_down (sp, 8);
+ sp = align_down (sp, 8);
/* Finally, place the actual parameters, working from SP towards
higher addresses. The code above is supposed to reserve enough
@@ -1571,98 +2019,126 @@ s390_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
int gr = 2;
CORE_ADDR starg = sp;
+ /* A struct is returned using general register 2. */
+ if (struct_return)
+ {
+ regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr,
+ struct_addr);
+ gr++;
+ }
+
for (i = 0; i < nargs; i++)
{
struct value *arg = args[i];
- struct type *type = VALUE_TYPE (arg);
-
- if (is_double_or_float (type)
- && fr <= 2)
- {
- /* When we store a single-precision value in an FP register,
- it occupies the leftmost bits. */
- deprecated_write_register_bytes (REGISTER_BYTE (S390_FP0_REGNUM + fr),
- VALUE_CONTENTS (arg),
- TYPE_LENGTH (type));
- fr += 2;
- }
- else if (is_simple_arg (type)
- && gr <= 6)
- {
- /* Do we need to pass a pointer to our copy of this
- argument? */
- if (pass_by_copy_ref (type))
- write_register (S390_GP0_REGNUM + gr, copy_addr[i]);
- else
- write_register (S390_GP0_REGNUM + gr, extend_simple_arg (arg));
-
- gr++;
- }
- else if (is_double_arg (type)
- && gr <= 5)
- {
- deprecated_write_register_gen (S390_GP0_REGNUM + gr,
- VALUE_CONTENTS (arg));
- deprecated_write_register_gen (S390_GP0_REGNUM + gr + 1,
- VALUE_CONTENTS (arg) + 4);
- gr += 2;
- }
- else
- {
- /* The `OTHER' case. */
- enum type_code code = TYPE_CODE (type);
- unsigned length = TYPE_LENGTH (type);
-
- /* If we skipped r6 because we couldn't fit a DOUBLE_ARG
- in it, then don't go back and use it again later. */
- if (is_double_arg (type) && gr == 6)
- gr = 7;
-
- if (is_simple_arg (type))
- {
- /* Simple args are always either extended to 32 bits,
- or pointers. */
- starg = round_up (starg, 4);
-
- /* Do we need to pass a pointer to our copy of this
- argument? */
- if (pass_by_copy_ref (type))
- write_memory_signed_integer (starg, pointer_size,
- copy_addr[i]);
- else
- /* Simple args are always extended to 32 bits. */
- write_memory_signed_integer (starg, 4,
- extend_simple_arg (arg));
- starg += 4;
- }
- else
- {
- /* You'd think we should say:
- starg = round_up (starg, alignment_of (type));
- Unfortunately, GCC seems to simply align the stack on
- a four-byte boundary, even when passing doubles. */
- starg = round_up (starg, 4);
- write_memory (starg, VALUE_CONTENTS (arg), length);
- starg += length;
- }
- }
+ struct type *type = value_type (arg);
+ unsigned length = TYPE_LENGTH (type);
+
+ if (s390_function_arg_pass_by_reference (type))
+ {
+ if (gr <= 6)
+ {
+ regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr,
+ copy_addr[i]);
+ gr++;
+ }
+ else
+ {
+ write_memory_unsigned_integer (starg, word_size, copy_addr[i]);
+ starg += word_size;
+ }
+ }
+ else if (s390_function_arg_float (type))
+ {
+ /* The GNU/Linux for S/390 ABI uses FPRs 0 and 2 to pass arguments,
+ the GNU/Linux for zSeries ABI uses 0, 2, 4, and 6. */
+ if (fr <= (tdep->abi == ABI_LINUX_S390 ? 2 : 6))
+ {
+ /* When we store a single-precision value in an FP register,
+ it occupies the leftmost bits. */
+ regcache_cooked_write_part (regcache, S390_F0_REGNUM + fr,
+ 0, length, value_contents (arg));
+ fr += 2;
+ }
+ else
+ {
+ /* When we store a single-precision value in a stack slot,
+ it occupies the rightmost bits. */
+ starg = align_up (starg + length, word_size);
+ write_memory (starg - length, value_contents (arg), length);
+ }
+ }
+ else if (s390_function_arg_integer (type) && length <= word_size)
+ {
+ if (gr <= 6)
+ {
+ /* Integer arguments are always extended to word size. */
+ regcache_cooked_write_signed (regcache, S390_R0_REGNUM + gr,
+ extend_simple_arg (arg));
+ gr++;
+ }
+ else
+ {
+ /* Integer arguments are always extended to word size. */
+ write_memory_signed_integer (starg, word_size,
+ extend_simple_arg (arg));
+ starg += word_size;
+ }
+ }
+ else if (s390_function_arg_integer (type) && length == 2*word_size)
+ {
+ if (gr <= 5)
+ {
+ regcache_cooked_write (regcache, S390_R0_REGNUM + gr,
+ value_contents (arg));
+ regcache_cooked_write (regcache, S390_R0_REGNUM + gr + 1,
+ value_contents (arg) + word_size);
+ gr += 2;
+ }
+ else
+ {
+ /* If we skipped r6 because we couldn't fit a DOUBLE_ARG
+ in it, then don't go back and use it again later. */
+ gr = 7;
+
+ write_memory (starg, value_contents (arg), length);
+ starg += length;
+ }
+ }
+ else
+ internal_error (__FILE__, __LINE__, _("unknown argument type"));
}
}
/* Allocate the standard frame areas: the register save area, the
word reserved for the compiler (which seems kind of meaningless),
and the back chain pointer. */
- sp -= 96;
+ sp -= 16*word_size + 32;
- /* Write the back chain pointer into the first word of the stack
- frame. This will help us get backtraces from within functions
- called from GDB. */
- write_memory_unsigned_integer (sp, (TARGET_PTR_BIT / TARGET_CHAR_BIT),
- deprecated_read_fp ());
+ /* Store return address. */
+ regcache_cooked_write_unsigned (regcache, S390_RETADDR_REGNUM, bp_addr);
+
+ /* Store updated stack pointer. */
+ regcache_cooked_write_unsigned (regcache, S390_SP_REGNUM, sp);
- return sp;
+ /* We need to return the 'stack part' of the frame ID,
+ which is actually the top of the register save area. */
+ return sp + 16*word_size + 32;
}
+/* Assuming THIS_FRAME is a dummy, return the frame ID of that
+ dummy frame. The frame ID's base needs to match the TOS value
+ returned by push_dummy_call, and the PC match the dummy frame's
+ breakpoint. */
+static struct frame_id
+s390_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
+{
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ CORE_ADDR sp = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
+ sp = gdbarch_addr_bits_remove (gdbarch, sp);
+
+ return frame_id_build (sp + 16*word_size + 32,
+ get_frame_pc (this_frame));
+}
static CORE_ADDR
s390_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
@@ -1673,95 +2149,136 @@ s390_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
}
-static int
-s390_use_struct_convention (int gcc_p, struct type *value_type)
-{
- enum type_code code = TYPE_CODE (value_type);
+/* Function return value access. */
- return (code == TYPE_CODE_STRUCT
- || code == TYPE_CODE_UNION);
-}
+static enum return_value_convention
+s390_return_value_convention (struct gdbarch *gdbarch, struct type *type)
+{
+ int length = TYPE_LENGTH (type);
+ if (length > 8)
+ return RETURN_VALUE_STRUCT_CONVENTION;
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ case TYPE_CODE_ARRAY:
+ return RETURN_VALUE_STRUCT_CONVENTION;
-/* Return the GDB type object for the "standard" data type
- of data in register N. */
-struct type *
-s390_register_virtual_type (int regno)
-{
- if (S390_FP0_REGNUM <= regno && regno < S390_FP0_REGNUM + S390_NUM_FPRS)
- return builtin_type_double;
- else
- return builtin_type_int;
+ default:
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
}
-
-struct type *
-s390x_register_virtual_type (int regno)
+static enum return_value_convention
+s390_return_value (struct gdbarch *gdbarch, struct type *func_type,
+ struct type *type, struct regcache *regcache,
+ gdb_byte *out, const gdb_byte *in)
{
- return (regno == S390_FPC_REGNUM) ||
- (regno >= S390_FIRST_ACR && regno <= S390_LAST_ACR) ? builtin_type_int :
- (regno >= S390_FP0_REGNUM) ? builtin_type_double : builtin_type_long;
-}
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ int length = TYPE_LENGTH (type);
+ enum return_value_convention rvc =
+ s390_return_value_convention (gdbarch, type);
+ if (in)
+ {
+ switch (rvc)
+ {
+ case RETURN_VALUE_REGISTER_CONVENTION:
+ if (TYPE_CODE (type) == TYPE_CODE_FLT
+ || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
+ {
+ /* When we store a single-precision value in an FP register,
+ it occupies the leftmost bits. */
+ regcache_cooked_write_part (regcache, S390_F0_REGNUM,
+ 0, length, in);
+ }
+ else if (length <= word_size)
+ {
+ /* Integer arguments are always extended to word size. */
+ if (TYPE_UNSIGNED (type))
+ regcache_cooked_write_unsigned (regcache, S390_R2_REGNUM,
+ extract_unsigned_integer (in, length));
+ else
+ regcache_cooked_write_signed (regcache, S390_R2_REGNUM,
+ extract_signed_integer (in, length));
+ }
+ else if (length == 2*word_size)
+ {
+ regcache_cooked_write (regcache, S390_R2_REGNUM, in);
+ regcache_cooked_write (regcache, S390_R3_REGNUM, in + word_size);
+ }
+ else
+ internal_error (__FILE__, __LINE__, _("invalid return type"));
+ break;
+ case RETURN_VALUE_STRUCT_CONVENTION:
+ error (_("Cannot set function return value."));
+ break;
+ }
+ }
+ else if (out)
+ {
+ switch (rvc)
+ {
+ case RETURN_VALUE_REGISTER_CONVENTION:
+ if (TYPE_CODE (type) == TYPE_CODE_FLT
+ || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
+ {
+ /* When we store a single-precision value in an FP register,
+ it occupies the leftmost bits. */
+ regcache_cooked_read_part (regcache, S390_F0_REGNUM,
+ 0, length, out);
+ }
+ else if (length <= word_size)
+ {
+ /* Integer arguments occupy the rightmost bits. */
+ regcache_cooked_read_part (regcache, S390_R2_REGNUM,
+ word_size - length, length, out);
+ }
+ else if (length == 2*word_size)
+ {
+ regcache_cooked_read (regcache, S390_R2_REGNUM, out);
+ regcache_cooked_read (regcache, S390_R3_REGNUM, out + word_size);
+ }
+ else
+ internal_error (__FILE__, __LINE__, _("invalid return type"));
+ break;
+ case RETURN_VALUE_STRUCT_CONVENTION:
+ error (_("Function return value unknown."));
+ break;
+ }
+ }
-void
-s390_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
-{
- write_register (S390_GP0_REGNUM + 2, addr);
+ return rvc;
}
+/* Breakpoints. */
-const static unsigned char *
-s390_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
+static const gdb_byte *
+s390_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, int *lenptr)
{
- static unsigned char breakpoint[] = { 0x0, 0x1 };
+ static const gdb_byte breakpoint[] = { 0x0, 0x1 };
*lenptr = sizeof (breakpoint);
return breakpoint;
}
-/* Advance PC across any function entry prologue instructions to reach some
- "real" code. */
-CORE_ADDR
-s390_skip_prologue (CORE_ADDR pc)
-{
- struct frame_extra_info fextra_info;
-
- s390_get_frame_info (pc, &fextra_info, NULL, 1);
- return fextra_info.skip_prologue_function_start;
-}
-
-/* Immediately after a function call, return the saved pc.
- Can't go through the frames for this because on some machines
- the new frame is not set up until the new function executes
- some instructions. */
-CORE_ADDR
-s390_saved_pc_after_call (struct frame_info *frame)
-{
- return ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM));
-}
-
-static CORE_ADDR
-s390_addr_bits_remove (CORE_ADDR addr)
-{
- return (addr) & 0x7fffffff;
-}
+/* Address handling. */
static CORE_ADDR
-s390_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
+s390_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR addr)
{
- write_register (S390_RETADDR_REGNUM, CALL_DUMMY_ADDRESS ());
- return sp;
+ return addr & 0x7fffffff;
}
static int
s390_address_class_type_flags (int byte_size, int dwarf2_addr_class)
{
if (byte_size == 4)
- return TYPE_FLAG_ADDRESS_CLASS_1;
+ return TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1;
else
return 0;
}
@@ -1769,32 +2286,32 @@ s390_address_class_type_flags (int byte_size, int dwarf2_addr_class)
static const char *
s390_address_class_type_flags_to_name (struct gdbarch *gdbarch, int type_flags)
{
- if (type_flags & TYPE_FLAG_ADDRESS_CLASS_1)
+ if (type_flags & TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1)
return "mode32";
else
return NULL;
}
-int
+static int
s390_address_class_name_to_type_flags (struct gdbarch *gdbarch, const char *name,
int *type_flags_ptr)
{
if (strcmp (name, "mode32") == 0)
{
- *type_flags_ptr = TYPE_FLAG_ADDRESS_CLASS_1;
+ *type_flags_ptr = TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1;
return 1;
}
else
return 0;
}
-struct gdbarch *
+/* Set up gdbarch struct. */
+
+static struct gdbarch *
s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
- static LONGEST s390_call_dummy_words[] = { 0 };
struct gdbarch *gdbarch;
struct gdbarch_tdep *tdep;
- int elf_flags;
/* First see if there is already a gdbarch that can satisfy the request. */
arches = gdbarch_list_lookup_by_info (arches, &info);
@@ -1806,101 +2323,91 @@ s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
return NULL; /* No; then it's not for us. */
/* Yes: create a new gdbarch for the specified machine type. */
- gdbarch = gdbarch_alloc (&info, NULL);
-
- /* NOTE: cagney/2002-12-06: This can be deleted when this arch is
- ready to unwind the PC first (see frame.c:get_prev_frame()). */
- set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default);
+ tdep = XCALLOC (1, struct gdbarch_tdep);
+ gdbarch = gdbarch_alloc (&info, tdep);
set_gdbarch_believe_pcc_promotion (gdbarch, 0);
set_gdbarch_char_signed (gdbarch, 0);
- set_gdbarch_frame_args_skip (gdbarch, 0);
- set_gdbarch_frame_args_address (gdbarch, s390_frame_args_address);
- set_gdbarch_deprecated_frame_chain (gdbarch, s390_frame_chain);
- set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, s390_frame_init_saved_regs);
- set_gdbarch_frame_locals_address (gdbarch, s390_frame_args_address);
- /* We can't do this */
- set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
- set_gdbarch_deprecated_store_struct_return (gdbarch, s390_store_struct_return);
- set_gdbarch_deprecated_extract_return_value (gdbarch, s390_extract_return_value);
- set_gdbarch_deprecated_store_return_value (gdbarch, s390_store_return_value);
+ /* S/390 GNU/Linux uses either 64-bit or 128-bit long doubles.
+ We can safely let them default to 128-bit, since the debug info
+ will give the size of type actually used in each case. */
+ set_gdbarch_long_double_bit (gdbarch, 128);
+ set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad);
+
/* Amount PC must be decremented by after a breakpoint. This is
- often the number of bytes returned by BREAKPOINT_FROM_PC but not
+ often the number of bytes returned by gdbarch_breakpoint_from_pc but not
always. */
set_gdbarch_decr_pc_after_break (gdbarch, 2);
- set_gdbarch_deprecated_pop_frame (gdbarch, s390_pop_frame);
/* Stack grows downward. */
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
- /* Offset from address of function to start of its code.
- Zero on most machines. */
- set_gdbarch_function_start_offset (gdbarch, 0);
- set_gdbarch_deprecated_max_register_raw_size (gdbarch, 8);
- set_gdbarch_deprecated_max_register_virtual_size (gdbarch, 8);
set_gdbarch_breakpoint_from_pc (gdbarch, s390_breakpoint_from_pc);
set_gdbarch_skip_prologue (gdbarch, s390_skip_prologue);
- set_gdbarch_deprecated_init_extra_frame_info (gdbarch, s390_init_extra_frame_info);
- set_gdbarch_deprecated_init_frame_pc_first (gdbarch, s390_init_frame_pc_first);
- set_gdbarch_deprecated_target_read_fp (gdbarch, s390_read_fp);
- /* This function that tells us whether the function invocation represented
- by FI does not have a frame on the stack associated with it. If it
- does not, FRAMELESS is set to 1, else 0. */
- set_gdbarch_frameless_function_invocation (gdbarch,
- s390_frameless_function_invocation);
- /* Return saved PC from a frame */
- set_gdbarch_deprecated_frame_saved_pc (gdbarch, s390_frame_saved_pc);
- /* DEPRECATED_FRAME_CHAIN takes a frame's nominal address and
- produces the frame's chain-pointer. */
- set_gdbarch_deprecated_frame_chain (gdbarch, s390_frame_chain);
- set_gdbarch_deprecated_saved_pc_after_call (gdbarch, s390_saved_pc_after_call);
- set_gdbarch_register_byte (gdbarch, s390_register_byte);
+ set_gdbarch_in_function_epilogue_p (gdbarch, s390_in_function_epilogue_p);
+
set_gdbarch_pc_regnum (gdbarch, S390_PC_REGNUM);
set_gdbarch_sp_regnum (gdbarch, S390_SP_REGNUM);
- set_gdbarch_deprecated_fp_regnum (gdbarch, S390_FP_REGNUM);
- set_gdbarch_fp0_regnum (gdbarch, S390_FP0_REGNUM);
+ set_gdbarch_fp0_regnum (gdbarch, S390_F0_REGNUM);
set_gdbarch_num_regs (gdbarch, S390_NUM_REGS);
- set_gdbarch_cannot_fetch_register (gdbarch, s390_cannot_fetch_register);
- set_gdbarch_cannot_store_register (gdbarch, s390_cannot_fetch_register);
- set_gdbarch_use_struct_convention (gdbarch, s390_use_struct_convention);
+ set_gdbarch_num_pseudo_regs (gdbarch, S390_NUM_PSEUDO_REGS);
set_gdbarch_register_name (gdbarch, s390_register_name);
- set_gdbarch_stab_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum);
- set_gdbarch_dwarf_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum);
- set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum);
- set_gdbarch_deprecated_extract_struct_value_address
- (gdbarch, generic_cannot_extract_struct_value_address);
-
- /* Parameters for inferior function calls. */
- set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_at_entry_point);
+ set_gdbarch_register_type (gdbarch, s390_register_type);
+ set_gdbarch_stab_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
+ set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
+ set_gdbarch_value_from_register (gdbarch, s390_value_from_register);
+ set_gdbarch_register_reggroup_p (gdbarch, s390_register_reggroup_p);
+ set_gdbarch_regset_from_core_section (gdbarch,
+ s390_regset_from_core_section);
+
+ /* Inferior function calls. */
+ set_gdbarch_push_dummy_call (gdbarch, s390_push_dummy_call);
+ set_gdbarch_dummy_id (gdbarch, s390_dummy_id);
set_gdbarch_frame_align (gdbarch, s390_frame_align);
- set_gdbarch_deprecated_push_arguments (gdbarch, s390_push_arguments);
- set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos);
- set_gdbarch_deprecated_push_return_address (gdbarch,
- s390_push_return_address);
- set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, sizeof (s390_call_dummy_words));
- set_gdbarch_deprecated_call_dummy_words (gdbarch, s390_call_dummy_words);
+ set_gdbarch_return_value (gdbarch, s390_return_value);
+
+ /* Frame handling. */
+ dwarf2_frame_set_init_reg (gdbarch, s390_dwarf2_frame_init_reg);
+ dwarf2_append_unwinders (gdbarch);
+ frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
+ frame_unwind_append_unwinder (gdbarch, &s390_stub_frame_unwind);
+ frame_unwind_append_unwinder (gdbarch, &s390_sigtramp_frame_unwind);
+ frame_unwind_append_unwinder (gdbarch, &s390_frame_unwind);
+ frame_base_set_default (gdbarch, &s390_frame_base);
+ set_gdbarch_unwind_pc (gdbarch, s390_unwind_pc);
+ set_gdbarch_unwind_sp (gdbarch, s390_unwind_sp);
switch (info.bfd_arch_info->mach)
{
case bfd_mach_s390_31:
- set_gdbarch_deprecated_register_size (gdbarch, 4);
- set_gdbarch_register_raw_size (gdbarch, s390_register_raw_size);
- set_gdbarch_register_virtual_size (gdbarch, s390_register_raw_size);
- set_gdbarch_register_virtual_type (gdbarch, s390_register_virtual_type);
+ tdep->abi = ABI_LINUX_S390;
+
+ tdep->gregset = &s390_gregset;
+ tdep->sizeof_gregset = s390_sizeof_gregset;
+ tdep->fpregset = &s390_fpregset;
+ tdep->sizeof_fpregset = s390_sizeof_fpregset;
set_gdbarch_addr_bits_remove (gdbarch, s390_addr_bits_remove);
- set_gdbarch_deprecated_register_bytes (gdbarch, S390_REGISTER_BYTES);
+ set_gdbarch_pseudo_register_read (gdbarch, s390_pseudo_register_read);
+ set_gdbarch_pseudo_register_write (gdbarch, s390_pseudo_register_write);
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, svr4_ilp32_fetch_link_map_offsets);
+
break;
case bfd_mach_s390_64:
- set_gdbarch_deprecated_register_size (gdbarch, 8);
- set_gdbarch_register_raw_size (gdbarch, s390x_register_raw_size);
- set_gdbarch_register_virtual_size (gdbarch, s390x_register_raw_size);
- set_gdbarch_register_virtual_type (gdbarch,
- s390x_register_virtual_type);
+ tdep->abi = ABI_LINUX_ZSERIES;
+
+ tdep->gregset = &s390x_gregset;
+ tdep->sizeof_gregset = s390x_sizeof_gregset;
+ tdep->fpregset = &s390_fpregset;
+ tdep->sizeof_fpregset = s390_sizeof_fpregset;
set_gdbarch_long_bit (gdbarch, 64);
set_gdbarch_long_long_bit (gdbarch, 64);
set_gdbarch_ptr_bit (gdbarch, 64);
- set_gdbarch_deprecated_register_bytes (gdbarch, S390X_REGISTER_BYTES);
+ set_gdbarch_pseudo_register_read (gdbarch, s390x_pseudo_register_read);
+ set_gdbarch_pseudo_register_write (gdbarch, s390x_pseudo_register_write);
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, svr4_lp64_fetch_link_map_offsets);
set_gdbarch_address_class_type_flags (gdbarch,
s390_address_class_type_flags);
set_gdbarch_address_class_type_flags_to_name (gdbarch,
@@ -1910,22 +2417,25 @@ s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
break;
}
- /* Should be using push_dummy_call. */
- set_gdbarch_deprecated_dummy_write_sp (gdbarch, deprecated_write_sp);
+ set_gdbarch_print_insn (gdbarch, print_insn_s390);
+
+ set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
+
+ /* Enable TLS support. */
+ set_gdbarch_fetch_tls_load_module_address (gdbarch,
+ svr4_fetch_objfile_link_map);
return gdbarch;
}
+extern initialize_file_ftype _initialize_s390_tdep; /* -Wmissing-prototypes */
+
void
_initialize_s390_tdep (void)
{
/* Hook us into the gdbarch mechanism. */
register_gdbarch_init (bfd_arch_s390, s390_gdbarch_init);
- if (!deprecated_tm_print_insn) /* Someone may have already set it */
- deprecated_tm_print_insn = gdb_print_insn_s390;
}
-
-#endif /* GDBSERVER */