X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=gdb%2Falpha-tdep.c;h=d0df72be3565af5eb1b391b8b5e58df09f62cba6;hb=ea764154c27a11619ba764a4c92f395ba5007234;hp=03fa331abf782b56d0a7c9c1d2c30dd0da08974b;hpb=ec7cc0e81672aaea3cc6610ac4989d5728530276;p=binutils-gdb.git
diff --git a/gdb/alpha-tdep.c b/gdb/alpha-tdep.c
index 03fa331abf7..d0df72be356 100644
--- a/gdb/alpha-tdep.c
+++ b/gdb/alpha-tdep.c
@@ -1,7 +1,6 @@
/* Target-dependent code for the ALPHA architecture, for GDB, the GNU Debugger.
- Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
- 2003, 2005, 2006, 2007 Free Software Foundation, Inc.
+ Copyright (C) 1993-2022 Free Software Foundation, Inc.
This file is part of GDB.
@@ -19,11 +18,10 @@
along with this program. If not, see . */
#include "defs.h"
-#include "doublest.h"
#include "frame.h"
#include "frame-unwind.h"
#include "frame-base.h"
-#include "dwarf2-frame.h"
+#include "dwarf2/frame.h"
#include "inferior.h"
#include "symtab.h"
#include "value.h"
@@ -32,7 +30,6 @@
#include "dis-asm.h"
#include "symfile.h"
#include "objfiles.h"
-#include "gdb_string.h"
#include "linespec.h"
#include "regcache.h"
#include "reggroups.h"
@@ -40,21 +37,54 @@
#include "osabi.h"
#include "block.h"
#include "infcall.h"
+#include "trad-frame.h"
#include "elf-bfd.h"
#include "alpha-tdep.h"
+#include
+
+/* Instruction decoding. The notations for registers, immediates and
+ opcodes are the same as the one used in Compaq's Alpha architecture
+ handbook. */
+
+#define INSN_OPCODE(insn) ((insn & 0xfc000000) >> 26)
+
+/* Memory instruction format */
+#define MEM_RA(insn) ((insn & 0x03e00000) >> 21)
+#define MEM_RB(insn) ((insn & 0x001f0000) >> 16)
+#define MEM_DISP(insn) \
+ (((insn & 0x8000) == 0) ? (insn & 0xffff) : -((-insn) & 0xffff))
+
+static const int lda_opcode = 0x08;
+static const int stq_opcode = 0x2d;
+
+/* Branch instruction format */
+#define BR_RA(insn) MEM_RA(insn)
+
+static const int br_opcode = 0x30;
+static const int bne_opcode = 0x3d;
+
+/* Operate instruction format */
+#define OPR_FUNCTION(insn) ((insn & 0xfe0) >> 5)
+#define OPR_HAS_IMMEDIATE(insn) ((insn & 0x1000) == 0x1000)
+#define OPR_RA(insn) MEM_RA(insn)
+#define OPR_RC(insn) ((insn & 0x1f))
+#define OPR_LIT(insn) ((insn & 0x1fe000) >> 13)
+
+static const int subq_opcode = 0x10;
+static const int subq_function = 0x29;
/* Return the name of the REGNO register.
An empty name corresponds to a register number that used to
- be used for a virtual register. That virtual register has
+ be used for a virtual register. That virtual register has
been removed, but the index is still reserved to maintain
compatibility with existing remote alpha targets. */
static const char *
-alpha_register_name (int regno)
+alpha_register_name (struct gdbarch *gdbarch, int regno)
{
static const char * const register_names[] =
{
@@ -77,33 +107,32 @@ alpha_register_name (int regno)
}
static int
-alpha_cannot_fetch_register (int regno)
+alpha_cannot_fetch_register (struct gdbarch *gdbarch, int regno)
{
- return (regno == ALPHA_ZERO_REGNUM
- || strlen (alpha_register_name (regno)) == 0);
+ return (strlen (alpha_register_name (gdbarch, regno)) == 0);
}
static int
-alpha_cannot_store_register (int regno)
+alpha_cannot_store_register (struct gdbarch *gdbarch, int regno)
{
return (regno == ALPHA_ZERO_REGNUM
- || strlen (alpha_register_name (regno)) == 0);
+ || strlen (alpha_register_name (gdbarch, regno)) == 0);
}
static struct type *
alpha_register_type (struct gdbarch *gdbarch, int regno)
{
if (regno == ALPHA_SP_REGNUM || regno == ALPHA_GP_REGNUM)
- return builtin_type_void_data_ptr;
+ return builtin_type (gdbarch)->builtin_data_ptr;
if (regno == ALPHA_PC_REGNUM)
- return builtin_type_void_func_ptr;
+ return builtin_type (gdbarch)->builtin_func_ptr;
/* Don't need to worry about little vs big endian until
some jerk tries to port to alpha-unicosmk. */
if (regno >= ALPHA_FP0_REGNUM && regno < ALPHA_FP0_REGNUM + 31)
- return builtin_type_ieee_double;
+ return builtin_type (gdbarch)->builtin_double;
- return builtin_type_int64;
+ return builtin_type (gdbarch)->builtin_int64;
}
/* Is REGNUM a member of REGGROUP? */
@@ -153,9 +182,11 @@ alpha_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
floating point and 32-bit integers. */
static void
-alpha_lds (void *out, const void *in)
+alpha_lds (struct gdbarch *gdbarch, void *out, const void *in)
{
- ULONGEST mem = extract_unsigned_integer (in, 4);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ ULONGEST mem
+ = extract_unsigned_integer ((const gdb_byte *) in, 4, byte_order);
ULONGEST frac = (mem >> 0) & 0x7fffff;
ULONGEST sign = (mem >> 31) & 1;
ULONGEST exp_msb = (mem >> 30) & 1;
@@ -175,71 +206,75 @@ alpha_lds (void *out, const void *in)
}
reg = (sign << 63) | (exp << 52) | (frac << 29);
- store_unsigned_integer (out, 8, reg);
+ store_unsigned_integer ((gdb_byte *) out, 8, byte_order, reg);
}
/* Similarly, this represents exactly the conversion performed by
the STS instruction. */
static void
-alpha_sts (void *out, const void *in)
+alpha_sts (struct gdbarch *gdbarch, void *out, const void *in)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
ULONGEST reg, mem;
- reg = extract_unsigned_integer (in, 8);
+ reg = extract_unsigned_integer ((const gdb_byte *) in, 8, byte_order);
mem = ((reg >> 32) & 0xc0000000) | ((reg >> 29) & 0x3fffffff);
- store_unsigned_integer (out, 4, mem);
+ store_unsigned_integer ((gdb_byte *) out, 4, byte_order, mem);
}
/* The alpha needs a conversion between register and memory format if the
register is a floating point register and memory format is float, as the
register format must be double or memory format is an integer with 4
- bytes or less, as the representation of integers in floating point
- registers is different. */
+ bytes, as the representation of integers in floating point
+ registers is different. */
static int
-alpha_convert_register_p (int regno, struct type *type)
+alpha_convert_register_p (struct gdbarch *gdbarch, int regno,
+ struct type *type)
{
- return (regno >= ALPHA_FP0_REGNUM && regno < ALPHA_FP0_REGNUM + 31);
+ return (regno >= ALPHA_FP0_REGNUM && regno < ALPHA_FP0_REGNUM + 31
+ && TYPE_LENGTH (type) == 4);
}
-static void
+static int
alpha_register_to_value (struct frame_info *frame, int regnum,
- struct type *valtype, gdb_byte *out)
+ struct type *valtype, gdb_byte *out,
+ int *optimizedp, int *unavailablep)
{
- gdb_byte in[MAX_REGISTER_SIZE];
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct value *value = get_frame_register_value (frame, regnum);
- frame_register_read (frame, regnum, in);
- switch (TYPE_LENGTH (valtype))
+ gdb_assert (value != NULL);
+ *optimizedp = value_optimized_out (value);
+ *unavailablep = !value_entirely_available (value);
+
+ if (*optimizedp || *unavailablep)
{
- case 4:
- alpha_sts (out, in);
- break;
- case 8:
- memcpy (out, in, 8);
- break;
- default:
- error (_("Cannot retrieve value from floating point register"));
+ release_value (value);
+ return 0;
}
+
+ /* Convert to VALTYPE. */
+
+ gdb_assert (TYPE_LENGTH (valtype) == 4);
+ alpha_sts (gdbarch, out, value_contents_all (value).data ());
+
+ release_value (value);
+ return 1;
}
static void
alpha_value_to_register (struct frame_info *frame, int regnum,
struct type *valtype, const gdb_byte *in)
{
- gdb_byte out[MAX_REGISTER_SIZE];
+ gdb_byte out[ALPHA_REGISTER_SIZE];
+
+ gdb_assert (TYPE_LENGTH (valtype) == 4);
+ gdb_assert (register_size (get_frame_arch (frame), regnum)
+ <= ALPHA_REGISTER_SIZE);
+ alpha_lds (get_frame_arch (frame), out, in);
- switch (TYPE_LENGTH (valtype))
- {
- case 4:
- alpha_lds (out, in);
- break;
- case 8:
- memcpy (out, in, 8);
- break;
- default:
- error (_("Cannot store value in floating point register"));
- }
put_frame_register (frame, regnum, out);
}
@@ -260,18 +295,19 @@ static CORE_ADDR
alpha_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)
+ function_call_return_method return_method,
+ CORE_ADDR struct_addr)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
int i;
- int accumulate_size = struct_return ? 8 : 0;
+ int accumulate_size = (return_method == return_method_struct) ? 8 : 0;
struct alpha_arg
{
- gdb_byte *contents;
+ const gdb_byte *contents;
int len;
int offset;
};
- struct alpha_arg *alpha_args
- = (struct alpha_arg *) alloca (nargs * sizeof (struct alpha_arg));
+ struct alpha_arg *alpha_args = XALLOCAVEC (struct alpha_arg, nargs);
struct alpha_arg *m_arg;
gdb_byte arg_reg_buffer[ALPHA_REGISTER_SIZE * ALPHA_NUM_ARG_REGS];
int required_arg_regs;
@@ -291,7 +327,7 @@ alpha_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
struct type *arg_type = check_typedef (value_type (arg));
/* Cast argument to long if necessary as the compiler does it too. */
- switch (TYPE_CODE (arg_type))
+ switch (arg_type->code ())
{
case TYPE_CODE_INT:
case TYPE_CODE_BOOL:
@@ -302,12 +338,12 @@ alpha_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
{
/* 32-bit values must be sign-extended to 64 bits
even if the base data type is unsigned. */
- arg_type = builtin_type_int32;
+ arg_type = builtin_type (gdbarch)->builtin_int32;
arg = value_cast (arg_type, arg);
}
if (TYPE_LENGTH (arg_type) < ALPHA_REGISTER_SIZE)
{
- arg_type = builtin_type_int64;
+ arg_type = builtin_type (gdbarch)->builtin_int64;
arg = value_cast (arg_type, arg);
}
break;
@@ -318,7 +354,7 @@ alpha_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
if (accumulate_size < sizeof (arg_reg_buffer)
&& TYPE_LENGTH (arg_type) == 4)
{
- arg_type = builtin_type_ieee_double;
+ arg_type = builtin_type (gdbarch)->builtin_double;
arg = value_cast (arg_type, arg);
}
/* Tru64 5.1 has a 128-bit long double, and passes this by
@@ -329,7 +365,7 @@ alpha_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
sp = (sp & -16) - 16;
/* Write the real data into the stack. */
- write_memory (sp, value_contents (arg), 16);
+ write_memory (sp, value_contents (arg).data (), 16);
/* Construct the indirection. */
arg_type = lookup_pointer_type (arg_type);
@@ -350,7 +386,7 @@ alpha_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
sp = (sp & -16) - 16;
/* Write the real data into the stack. */
- write_memory (sp, value_contents (arg), 32);
+ write_memory (sp, value_contents (arg).data (), 32);
/* Construct the indirection. */
arg_type = lookup_pointer_type (arg_type);
@@ -364,7 +400,7 @@ alpha_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
m_arg->len = TYPE_LENGTH (arg_type);
m_arg->offset = accumulate_size;
accumulate_size = (accumulate_size + m_arg->len + 7) & ~7;
- m_arg->contents = value_contents_writeable (arg);
+ m_arg->contents = value_contents (arg).data ();
}
/* Determine required argument register loads, loading an argument register
@@ -386,7 +422,7 @@ alpha_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
/* `Push' arguments on the stack. */
for (i = nargs; m_arg--, --i >= 0;)
{
- gdb_byte *contents = m_arg->contents;
+ const gdb_byte *contents = m_arg->contents;
int offset = m_arg->offset;
int len = m_arg->len;
@@ -411,16 +447,17 @@ alpha_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
/* Everything else goes to the stack. */
write_memory (sp + offset - sizeof(arg_reg_buffer), contents, len);
}
- if (struct_return)
- store_unsigned_integer (arg_reg_buffer, ALPHA_REGISTER_SIZE, struct_addr);
+ if (return_method == return_method_struct)
+ store_unsigned_integer (arg_reg_buffer, ALPHA_REGISTER_SIZE,
+ byte_order, struct_addr);
/* Load the argument registers. */
for (i = 0; i < required_arg_regs; i++)
{
- regcache_cooked_write (regcache, ALPHA_A0_REGNUM + i,
- arg_reg_buffer + i*ALPHA_REGISTER_SIZE);
- regcache_cooked_write (regcache, ALPHA_FPA0_REGNUM + i,
- arg_reg_buffer + i*ALPHA_REGISTER_SIZE);
+ regcache->cooked_write (ALPHA_A0_REGNUM + i,
+ arg_reg_buffer + i * ALPHA_REGISTER_SIZE);
+ regcache->cooked_write (ALPHA_FPA0_REGNUM + i,
+ arg_reg_buffer + i * ALPHA_REGISTER_SIZE);
}
/* Finally, update the stack pointer. */
@@ -436,22 +473,23 @@ static void
alpha_extract_return_value (struct type *valtype, struct regcache *regcache,
gdb_byte *valbuf)
{
- int length = TYPE_LENGTH (valtype);
+ struct gdbarch *gdbarch = regcache->arch ();
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
gdb_byte raw_buffer[ALPHA_REGISTER_SIZE];
ULONGEST l;
- switch (TYPE_CODE (valtype))
+ switch (valtype->code ())
{
case TYPE_CODE_FLT:
- switch (length)
+ switch (TYPE_LENGTH (valtype))
{
case 4:
- regcache_cooked_read (regcache, ALPHA_FP0_REGNUM, raw_buffer);
- alpha_sts (valbuf, raw_buffer);
+ regcache->cooked_read (ALPHA_FP0_REGNUM, raw_buffer);
+ alpha_sts (gdbarch, valbuf, raw_buffer);
break;
case 8:
- regcache_cooked_read (regcache, ALPHA_FP0_REGNUM, valbuf);
+ regcache->cooked_read (ALPHA_FP0_REGNUM, valbuf);
break;
case 16:
@@ -460,37 +498,39 @@ alpha_extract_return_value (struct type *valtype, struct regcache *regcache,
break;
default:
- internal_error (__FILE__, __LINE__, _("unknown floating point width"));
+ internal_error (__FILE__, __LINE__,
+ _("unknown floating point width"));
}
break;
case TYPE_CODE_COMPLEX:
- switch (length)
+ switch (TYPE_LENGTH (valtype))
{
case 8:
/* ??? This isn't correct wrt the ABI, but it's what GCC does. */
- regcache_cooked_read (regcache, ALPHA_FP0_REGNUM, valbuf);
+ regcache->cooked_read (ALPHA_FP0_REGNUM, valbuf);
break;
case 16:
- regcache_cooked_read (regcache, ALPHA_FP0_REGNUM, valbuf);
- regcache_cooked_read (regcache, ALPHA_FP0_REGNUM + 1, valbuf + 8);
+ regcache->cooked_read (ALPHA_FP0_REGNUM, valbuf);
+ regcache->cooked_read (ALPHA_FP0_REGNUM + 1, valbuf + 8);
break;
case 32:
- regcache_cooked_read_signed (regcache, ALPHA_V0_REGNUM, &l);
+ regcache_cooked_read_unsigned (regcache, ALPHA_V0_REGNUM, &l);
read_memory (l, valbuf, 32);
break;
default:
- internal_error (__FILE__, __LINE__, _("unknown floating point width"));
+ internal_error (__FILE__, __LINE__,
+ _("unknown floating point width"));
}
break;
default:
/* Assume everything else degenerates to an integer. */
regcache_cooked_read_unsigned (regcache, ALPHA_V0_REGNUM, &l);
- store_unsigned_integer (valbuf, length, l);
+ store_unsigned_integer (valbuf, TYPE_LENGTH (valtype), byte_order, l);
break;
}
}
@@ -502,22 +542,22 @@ static void
alpha_store_return_value (struct type *valtype, struct regcache *regcache,
const gdb_byte *valbuf)
{
- int length = TYPE_LENGTH (valtype);
+ struct gdbarch *gdbarch = regcache->arch ();
gdb_byte raw_buffer[ALPHA_REGISTER_SIZE];
ULONGEST l;
- switch (TYPE_CODE (valtype))
+ switch (valtype->code ())
{
case TYPE_CODE_FLT:
- switch (length)
+ switch (TYPE_LENGTH (valtype))
{
case 4:
- alpha_lds (raw_buffer, valbuf);
- regcache_cooked_write (regcache, ALPHA_FP0_REGNUM, raw_buffer);
+ alpha_lds (gdbarch, raw_buffer, valbuf);
+ regcache->cooked_write (ALPHA_FP0_REGNUM, raw_buffer);
break;
case 8:
- regcache_cooked_write (regcache, ALPHA_FP0_REGNUM, valbuf);
+ regcache->cooked_write (ALPHA_FP0_REGNUM, valbuf);
break;
case 16:
@@ -527,21 +567,22 @@ alpha_store_return_value (struct type *valtype, struct regcache *regcache,
error (_("Cannot set a 128-bit long double return value."));
default:
- internal_error (__FILE__, __LINE__, _("unknown floating point width"));
+ internal_error (__FILE__, __LINE__,
+ _("unknown floating point width"));
}
break;
case TYPE_CODE_COMPLEX:
- switch (length)
+ switch (TYPE_LENGTH (valtype))
{
case 8:
/* ??? This isn't correct wrt the ABI, but it's what GCC does. */
- regcache_cooked_write (regcache, ALPHA_FP0_REGNUM, valbuf);
+ regcache->cooked_write (ALPHA_FP0_REGNUM, valbuf);
break;
case 16:
- regcache_cooked_write (regcache, ALPHA_FP0_REGNUM, valbuf);
- regcache_cooked_write (regcache, ALPHA_FP0_REGNUM + 1, valbuf + 8);
+ regcache->cooked_write (ALPHA_FP0_REGNUM, valbuf);
+ regcache->cooked_write (ALPHA_FP0_REGNUM + 1, valbuf + 8);
break;
case 32:
@@ -551,7 +592,8 @@ alpha_store_return_value (struct type *valtype, struct regcache *regcache,
error (_("Cannot set a 128-bit long double return value."));
default:
- internal_error (__FILE__, __LINE__, _("unknown floating point width"));
+ internal_error (__FILE__, __LINE__,
+ _("unknown floating point width"));
}
break;
@@ -559,8 +601,8 @@ alpha_store_return_value (struct type *valtype, struct regcache *regcache,
/* Assume everything else degenerates to an integer. */
/* 32-bit values must be sign-extended to 64 bits
even if the base data type is unsigned. */
- if (length == 4)
- valtype = builtin_type_int32;
+ if (TYPE_LENGTH (valtype) == 4)
+ valtype = builtin_type (gdbarch)->builtin_int32;
l = unpack_long (valtype, valbuf);
regcache_cooked_write_unsigned (regcache, ALPHA_V0_REGNUM, l);
break;
@@ -568,16 +610,17 @@ alpha_store_return_value (struct type *valtype, struct regcache *regcache,
}
static enum return_value_convention
-alpha_return_value (struct gdbarch *gdbarch, struct type *type,
- struct regcache *regcache, gdb_byte *readbuf,
- const gdb_byte *writebuf)
+alpha_return_value (struct gdbarch *gdbarch, struct value *function,
+ struct type *type, struct regcache *regcache,
+ gdb_byte *readbuf, const gdb_byte *writebuf)
{
- enum type_code code = TYPE_CODE (type);
+ enum type_code code = type->code ();
+ alpha_gdbarch_tdep *tdep = (alpha_gdbarch_tdep *) gdbarch_tdep (gdbarch);
if ((code == TYPE_CODE_STRUCT
|| code == TYPE_CODE_UNION
|| code == TYPE_CODE_ARRAY)
- && gdbarch_tdep (gdbarch)->return_in_memory (type))
+ && tdep->return_in_memory (type))
{
if (readbuf)
{
@@ -603,14 +646,10 @@ alpha_return_in_memory_always (struct type *type)
return 1;
}
-static const gdb_byte *
-alpha_breakpoint_from_pc (CORE_ADDR *pc, int *len)
-{
- static const gdb_byte break_insn[] = { 0x80, 0, 0, 0 }; /* call_pal bpt */
- *len = sizeof(break_insn);
- return break_insn;
-}
+constexpr gdb_byte alpha_break_insn[] = { 0x80, 0, 0, 0 }; /* call_pal bpt */
+
+typedef BP_MANIPULATION (alpha_break_insn) alpha_breakpoint;
/* This returns the PC of the first insn after the prologue.
@@ -637,15 +676,16 @@ alpha_after_prologue (CORE_ADDR pc)
/* Read an instruction from memory at PC, looking through breakpoints. */
unsigned int
-alpha_read_insn (CORE_ADDR pc)
+alpha_read_insn (struct gdbarch *gdbarch, CORE_ADDR pc)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
gdb_byte buf[ALPHA_INSN_SIZE];
- int status;
+ int res;
- status = read_memory_nobpt (pc, buf, sizeof (buf));
- if (status)
- memory_error (status, pc);
- return extract_unsigned_integer (buf, sizeof (buf));
+ res = target_read_memory (pc, buf, sizeof (buf));
+ if (res != 0)
+ memory_error (TARGET_XFER_E_IO, pc);
+ return extract_unsigned_integer (buf, sizeof (buf), byte_order);
}
/* To skip prologues, I use this predicate. Returns either PC itself
@@ -656,7 +696,7 @@ alpha_read_insn (CORE_ADDR pc)
anything which might clobber the registers which are being saved. */
static CORE_ADDR
-alpha_skip_prologue (CORE_ADDR pc)
+alpha_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
{
unsigned long inst;
int offset;
@@ -679,17 +719,17 @@ alpha_skip_prologue (CORE_ADDR pc)
post_prologue_pc = alpha_after_prologue (pc);
if (post_prologue_pc != 0)
- return max (pc, post_prologue_pc);
+ return std::max (pc, post_prologue_pc);
/* Can't determine prologue from the symbol table, need to examine
instructions. */
- /* Skip the typical prologue instructions. These are the stack adjustment
+ /* Skip the typical prologue instructions. These are the stack adjustment
instruction and the instructions that save registers on the stack
or in the gcc frame. */
for (offset = 0; offset < 100; offset += ALPHA_INSN_SIZE)
{
- inst = alpha_read_insn (pc + offset);
+ inst = alpha_read_insn (gdbarch, pc + offset);
if ((inst & 0xffff0000) == 0x27bb0000) /* ldah $gp,n($t12) */
continue;
@@ -715,6 +755,92 @@ alpha_skip_prologue (CORE_ADDR pc)
return pc + offset;
}
+
+static const int ldl_l_opcode = 0x2a;
+static const int ldq_l_opcode = 0x2b;
+static const int stl_c_opcode = 0x2e;
+static const int stq_c_opcode = 0x2f;
+
+/* Checks for an atomic sequence of instructions beginning with a LDL_L/LDQ_L
+ instruction and ending with a STL_C/STQ_C instruction. If such a sequence
+ is found, attempt to step through it. A breakpoint is placed at the end of
+ the sequence. */
+
+static std::vector
+alpha_deal_with_atomic_sequence (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ CORE_ADDR breaks[2] = {CORE_ADDR_MAX, CORE_ADDR_MAX};
+ CORE_ADDR loc = pc;
+ CORE_ADDR closing_insn; /* Instruction that closes the atomic sequence. */
+ unsigned int insn = alpha_read_insn (gdbarch, loc);
+ int insn_count;
+ int index;
+ int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed). */
+ const int atomic_sequence_length = 16; /* Instruction sequence length. */
+ int bc_insn_count = 0; /* Conditional branch instruction count. */
+
+ /* Assume all atomic sequences start with a LDL_L/LDQ_L instruction. */
+ if (INSN_OPCODE (insn) != ldl_l_opcode
+ && INSN_OPCODE (insn) != ldq_l_opcode)
+ return {};
+
+ /* Assume that no atomic sequence is longer than "atomic_sequence_length"
+ instructions. */
+ for (insn_count = 0; insn_count < atomic_sequence_length; ++insn_count)
+ {
+ loc += ALPHA_INSN_SIZE;
+ insn = alpha_read_insn (gdbarch, loc);
+
+ /* Assume that there is at most one branch in the atomic
+ sequence. If a branch is found, put a breakpoint in
+ its destination address. */
+ if (INSN_OPCODE (insn) >= br_opcode)
+ {
+ int immediate = (insn & 0x001fffff) << 2;
+
+ immediate = (immediate ^ 0x400000) - 0x400000;
+
+ if (bc_insn_count >= 1)
+ return {}; /* More than one branch found, fallback
+ to the standard single-step code. */
+
+ breaks[1] = loc + ALPHA_INSN_SIZE + immediate;
+
+ bc_insn_count++;
+ last_breakpoint++;
+ }
+
+ if (INSN_OPCODE (insn) == stl_c_opcode
+ || INSN_OPCODE (insn) == stq_c_opcode)
+ break;
+ }
+
+ /* Assume that the atomic sequence ends with a STL_C/STQ_C instruction. */
+ if (INSN_OPCODE (insn) != stl_c_opcode
+ && INSN_OPCODE (insn) != stq_c_opcode)
+ return {};
+
+ closing_insn = loc;
+ loc += ALPHA_INSN_SIZE;
+
+ /* Insert a breakpoint right after the end of the atomic sequence. */
+ breaks[0] = loc;
+
+ /* Check for duplicated breakpoints. Check also for a breakpoint
+ placed (branch instruction's destination) anywhere in sequence. */
+ if (last_breakpoint
+ && (breaks[1] == breaks[0]
+ || (breaks[1] >= pc && breaks[1] <= closing_insn)))
+ last_breakpoint = 0;
+
+ std::vector next_pcs;
+
+ for (index = 0; index <= last_breakpoint; index++)
+ next_pcs.push_back (breaks[index]);
+
+ return next_pcs;
+}
+
/* Figure out where the longjmp will land.
We expect the first arg to be a pointer to the jmp_buf structure from
@@ -724,7 +850,9 @@ alpha_skip_prologue (CORE_ADDR pc)
static int
alpha_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (frame));
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ alpha_gdbarch_tdep *tdep = (alpha_gdbarch_tdep *) gdbarch_tdep (gdbarch);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR jb_addr;
gdb_byte raw_buffer[ALPHA_REGISTER_SIZE];
@@ -734,7 +862,7 @@ alpha_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
raw_buffer, tdep->jb_elt_size))
return 0;
- *pc = extract_unsigned_integer (raw_buffer, tdep->jb_elt_size);
+ *pc = extract_unsigned_integer (raw_buffer, tdep->jb_elt_size, byte_order);
return 1;
}
@@ -751,20 +879,20 @@ struct alpha_sigtramp_unwind_cache
};
static struct alpha_sigtramp_unwind_cache *
-alpha_sigtramp_frame_unwind_cache (struct frame_info *next_frame,
+alpha_sigtramp_frame_unwind_cache (struct frame_info *this_frame,
void **this_prologue_cache)
{
struct alpha_sigtramp_unwind_cache *info;
- struct gdbarch_tdep *tdep;
if (*this_prologue_cache)
- return *this_prologue_cache;
+ return (struct alpha_sigtramp_unwind_cache *) *this_prologue_cache;
info = FRAME_OBSTACK_ZALLOC (struct alpha_sigtramp_unwind_cache);
*this_prologue_cache = info;
- tdep = gdbarch_tdep (get_frame_arch (next_frame));
- info->sigcontext_addr = tdep->sigcontext_addr (next_frame);
+ gdbarch *arch = get_frame_arch (this_frame);
+ alpha_gdbarch_tdep *tdep = (alpha_gdbarch_tdep *) gdbarch_tdep (arch);
+ info->sigcontext_addr = tdep->sigcontext_addr (this_frame);
return info;
}
@@ -773,9 +901,10 @@ alpha_sigtramp_frame_unwind_cache (struct frame_info *next_frame,
all arithmetic, it doesn't seem worthwhile to cache it. */
static CORE_ADDR
-alpha_sigtramp_register_address (CORE_ADDR sigcontext_addr, int regnum)
+alpha_sigtramp_register_address (struct gdbarch *gdbarch,
+ CORE_ADDR sigcontext_addr, int regnum)
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ alpha_gdbarch_tdep *tdep = (alpha_gdbarch_tdep *) gdbarch_tdep (gdbarch);
if (regnum >= 0 && regnum < 32)
return sigcontext_addr + tdep->sc_regs_offset + regnum * 8;
@@ -791,13 +920,14 @@ alpha_sigtramp_register_address (CORE_ADDR sigcontext_addr, int regnum)
frame. This will be used to create a new GDB frame struct. */
static void
-alpha_sigtramp_frame_this_id (struct frame_info *next_frame,
+alpha_sigtramp_frame_this_id (struct frame_info *this_frame,
void **this_prologue_cache,
struct frame_id *this_id)
{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ alpha_gdbarch_tdep *tdep = (alpha_gdbarch_tdep *) gdbarch_tdep (gdbarch);
struct alpha_sigtramp_unwind_cache *info
- = alpha_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache);
- struct gdbarch_tdep *tdep;
+ = alpha_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
CORE_ADDR stack_addr, code_addr;
/* If the OSABI couldn't locate the sigcontext, give up. */
@@ -807,24 +937,23 @@ alpha_sigtramp_frame_this_id (struct frame_info *next_frame,
/* If we have dynamic signal trampolines, find their start.
If we do not, then we must assume there is a symbol record
that can provide the start address. */
- tdep = gdbarch_tdep (get_frame_arch (next_frame));
if (tdep->dynamic_sigtramp_offset)
{
int offset;
- code_addr = frame_pc_unwind (next_frame);
- offset = tdep->dynamic_sigtramp_offset (code_addr);
+ code_addr = get_frame_pc (this_frame);
+ offset = tdep->dynamic_sigtramp_offset (gdbarch, code_addr);
if (offset >= 0)
code_addr -= offset;
else
code_addr = 0;
}
else
- code_addr = frame_func_unwind (next_frame, SIGTRAMP_FRAME);
+ code_addr = get_frame_func (this_frame);
/* The stack address is trivially read from the sigcontext. */
- stack_addr = alpha_sigtramp_register_address (info->sigcontext_addr,
+ stack_addr = alpha_sigtramp_register_address (gdbarch, info->sigcontext_addr,
ALPHA_SP_REGNUM);
- stack_addr = get_frame_memory_unsigned (next_frame, stack_addr,
+ stack_addr = get_frame_memory_unsigned (this_frame, stack_addr,
ALPHA_REGISTER_SIZE);
*this_id = frame_id_build (stack_addr, code_addr);
@@ -832,92 +961,77 @@ alpha_sigtramp_frame_this_id (struct frame_info *next_frame,
/* Retrieve the value of REGNUM in FRAME. Don't give up! */
-static void
-alpha_sigtramp_frame_prev_register (struct frame_info *next_frame,
- void **this_prologue_cache,
- int regnum, int *optimizedp,
- enum lval_type *lvalp, CORE_ADDR *addrp,
- int *realnump, gdb_byte *bufferp)
+static struct value *
+alpha_sigtramp_frame_prev_register (struct frame_info *this_frame,
+ void **this_prologue_cache, int regnum)
{
struct alpha_sigtramp_unwind_cache *info
- = alpha_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache);
+ = alpha_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
CORE_ADDR addr;
if (info->sigcontext_addr != 0)
{
/* All integer and fp registers are stored in memory. */
- addr = alpha_sigtramp_register_address (info->sigcontext_addr, regnum);
+ addr = alpha_sigtramp_register_address (get_frame_arch (this_frame),
+ info->sigcontext_addr, regnum);
if (addr != 0)
- {
- *optimizedp = 0;
- *lvalp = lval_memory;
- *addrp = addr;
- *realnump = -1;
- if (bufferp != NULL)
- get_frame_memory (next_frame, addr, bufferp, ALPHA_REGISTER_SIZE);
- return;
- }
+ return frame_unwind_got_memory (this_frame, regnum, addr);
}
/* This extra register may actually be in the sigcontext, but our
current description of it in alpha_sigtramp_frame_unwind_cache
doesn't include it. Too bad. Fall back on whatever's in the
outer frame. */
- *optimizedp = 0;
- *lvalp = lval_register;
- *addrp = 0;
- *realnump = regnum;
- if (bufferp)
- frame_unwind_register (next_frame, *realnump, bufferp);
+ return frame_unwind_got_register (this_frame, regnum, regnum);
}
-static const struct frame_unwind alpha_sigtramp_frame_unwind = {
- SIGTRAMP_FRAME,
- alpha_sigtramp_frame_this_id,
- alpha_sigtramp_frame_prev_register
-};
-
-static const struct frame_unwind *
-alpha_sigtramp_frame_sniffer (struct frame_info *next_frame)
+static int
+alpha_sigtramp_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_prologue_cache)
{
- struct gdbarch *gdbarch = get_frame_arch (next_frame);
- CORE_ADDR pc = frame_pc_unwind (next_frame);
- char *name;
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ CORE_ADDR pc = get_frame_pc (this_frame);
+ const char *name;
/* NOTE: cagney/2004-04-30: Do not copy/clone this code. Instead
- look at tramp-frame.h and other simplier per-architecture
+ look at tramp-frame.h and other simpler per-architecture
sigtramp unwinders. */
/* We shouldn't even bother to try if the OSABI didn't register a
- sigcontext_addr handler or pc_in_sigtramp hander. */
- if (gdbarch_tdep (gdbarch)->sigcontext_addr == NULL)
- return NULL;
- if (gdbarch_tdep (gdbarch)->pc_in_sigtramp == NULL)
- return NULL;
+ sigcontext_addr handler or pc_in_sigtramp handler. */
+ alpha_gdbarch_tdep *tdep = (alpha_gdbarch_tdep *) gdbarch_tdep (gdbarch);
+ if (tdep->sigcontext_addr == NULL)
+ return 0;
+
+ if (tdep->pc_in_sigtramp == NULL)
+ return 0;
/* Otherwise we should be in a signal frame. */
find_pc_partial_function (pc, &name, NULL, NULL);
- if (gdbarch_tdep (gdbarch)->pc_in_sigtramp (pc, name))
- return &alpha_sigtramp_frame_unwind;
+ if (tdep->pc_in_sigtramp (gdbarch, pc, name))
+ return 1;
- return NULL;
+ return 0;
}
-
-/* Fallback alpha frame unwinder. Uses instruction scanning and knows
- something about the traditional layout of alpha stack frames. */
-struct alpha_heuristic_unwind_cache
+static const struct frame_unwind alpha_sigtramp_frame_unwind =
{
- CORE_ADDR *saved_regs;
- CORE_ADDR vfp;
- CORE_ADDR start_pc;
- int return_reg;
+ "alpha sigtramp",
+ SIGTRAMP_FRAME,
+ default_frame_unwind_stop_reason,
+ alpha_sigtramp_frame_this_id,
+ alpha_sigtramp_frame_prev_register,
+ NULL,
+ alpha_sigtramp_frame_sniffer
};
+
+
/* Heuristic_proc_start may hunt through the text section for a long
time across a 2400 baud serial line. Allows the user to limit this
search. */
-static unsigned int heuristic_fence_post = 0;
+static int heuristic_fence_post = 0;
/* Attempt to locate the start of the function containing PC. We assume that
the previous function ends with an about_to_return insn. Not foolproof by
@@ -925,13 +1039,14 @@ static unsigned int heuristic_fence_post = 0;
function. But we're guessing anyway... */
static CORE_ADDR
-alpha_heuristic_proc_start (CORE_ADDR pc)
+alpha_heuristic_proc_start (struct gdbarch *gdbarch, CORE_ADDR pc)
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ alpha_gdbarch_tdep *tdep = (alpha_gdbarch_tdep *) gdbarch_tdep (gdbarch);
CORE_ADDR last_non_nop = pc;
CORE_ADDR fence = pc - heuristic_fence_post;
CORE_ADDR orig_pc = pc;
CORE_ADDR func;
+ struct inferior *inf;
if (pc == 0)
return 0;
@@ -943,7 +1058,7 @@ alpha_heuristic_proc_start (CORE_ADDR pc)
if (func)
return func;
- if (heuristic_fence_post == UINT_MAX
+ if (heuristic_fence_post == -1
|| fence < tdep->vm_min_address)
fence = tdep->vm_min_address;
@@ -952,7 +1067,7 @@ alpha_heuristic_proc_start (CORE_ADDR pc)
nops, since this usually indicates padding between functions. */
for (pc -= ALPHA_INSN_SIZE; pc >= fence; pc -= ALPHA_INSN_SIZE)
{
- unsigned int insn = alpha_read_insn (pc);
+ unsigned int insn = alpha_read_insn (gdbarch, pc);
switch (insn)
{
case 0: /* invalid insn */
@@ -969,19 +1084,21 @@ alpha_heuristic_proc_start (CORE_ADDR pc)
}
}
+ inf = current_inferior ();
+
/* It's not clear to me why we reach this point when stopping quietly,
but with this test, at least we don't print out warnings for every
child forked (eg, on decstation). 22apr93 rich@cygnus.com. */
- if (stop_soon == NO_STOP_QUIETLY)
+ if (inf->control.stop_soon == NO_STOP_QUIETLY)
{
static int blurb_printed = 0;
if (fence == tdep->vm_min_address)
warning (_("Hit beginning of text section without finding \
-enclosing function for address 0x%s"), paddr_nz (orig_pc));
+enclosing function for address %s"), paddress (gdbarch, orig_pc));
else
warning (_("Hit heuristic-fence-post without finding \
-enclosing function for address 0x%s"), paddr_nz (orig_pc));
+enclosing function for address %s"), paddress (gdbarch, orig_pc));
if (!blurb_printed)
{
@@ -999,26 +1116,139 @@ Otherwise, you told GDB there was a function where there isn't one, or\n\
return 0;
}
+/* Fallback alpha frame unwinder. Uses instruction scanning and knows
+ something about the traditional layout of alpha stack frames. */
+
+struct alpha_heuristic_unwind_cache
+{
+ CORE_ADDR vfp;
+ CORE_ADDR start_pc;
+ trad_frame_saved_reg *saved_regs;
+ int return_reg;
+};
+
+/* If a probing loop sequence starts at PC, simulate it and compute
+ FRAME_SIZE and PC after its execution. Otherwise, return with PC and
+ FRAME_SIZE unchanged. */
+
+static void
+alpha_heuristic_analyze_probing_loop (struct gdbarch *gdbarch, CORE_ADDR *pc,
+ int *frame_size)
+{
+ CORE_ADDR cur_pc = *pc;
+ int cur_frame_size = *frame_size;
+ int nb_of_iterations, reg_index, reg_probe;
+ unsigned int insn;
+
+ /* The following pattern is recognized as a probing loop:
+
+ lda REG_INDEX,NB_OF_ITERATIONS
+ lda REG_PROBE,(sp)
+
+ LOOP_START:
+ stq zero,(REG_PROBE)
+ subq REG_INDEX,0x1,REG_INDEX
+ lda REG_PROBE,(REG_PROBE)
+ bne REG_INDEX, LOOP_START
+
+ lda sp,(REG_PROBE)
+
+ If anything different is found, the function returns without
+ changing PC and FRAME_SIZE. Otherwise, PC will point immediately
+ after this sequence, and FRAME_SIZE will be updated. */
+
+ /* lda REG_INDEX,NB_OF_ITERATIONS */
+
+ insn = alpha_read_insn (gdbarch, cur_pc);
+ if (INSN_OPCODE (insn) != lda_opcode)
+ return;
+ reg_index = MEM_RA (insn);
+ nb_of_iterations = MEM_DISP (insn);
+
+ /* lda REG_PROBE,(sp) */
+
+ cur_pc += ALPHA_INSN_SIZE;
+ insn = alpha_read_insn (gdbarch, cur_pc);
+ if (INSN_OPCODE (insn) != lda_opcode
+ || MEM_RB (insn) != ALPHA_SP_REGNUM)
+ return;
+ reg_probe = MEM_RA (insn);
+ cur_frame_size -= MEM_DISP (insn);
+
+ /* stq zero,(REG_PROBE) */
+
+ cur_pc += ALPHA_INSN_SIZE;
+ insn = alpha_read_insn (gdbarch, cur_pc);
+ if (INSN_OPCODE (insn) != stq_opcode
+ || MEM_RA (insn) != 0x1f
+ || MEM_RB (insn) != reg_probe)
+ return;
+
+ /* subq REG_INDEX,0x1,REG_INDEX */
+
+ cur_pc += ALPHA_INSN_SIZE;
+ insn = alpha_read_insn (gdbarch, cur_pc);
+ if (INSN_OPCODE (insn) != subq_opcode
+ || !OPR_HAS_IMMEDIATE (insn)
+ || OPR_FUNCTION (insn) != subq_function
+ || OPR_LIT(insn) != 1
+ || OPR_RA (insn) != reg_index
+ || OPR_RC (insn) != reg_index)
+ return;
+
+ /* lda REG_PROBE,(REG_PROBE) */
+
+ cur_pc += ALPHA_INSN_SIZE;
+ insn = alpha_read_insn (gdbarch, cur_pc);
+ if (INSN_OPCODE (insn) != lda_opcode
+ || MEM_RA (insn) != reg_probe
+ || MEM_RB (insn) != reg_probe)
+ return;
+ cur_frame_size -= MEM_DISP (insn) * nb_of_iterations;
+
+ /* bne REG_INDEX, LOOP_START */
+
+ cur_pc += ALPHA_INSN_SIZE;
+ insn = alpha_read_insn (gdbarch, cur_pc);
+ if (INSN_OPCODE (insn) != bne_opcode
+ || MEM_RA (insn) != reg_index)
+ return;
+
+ /* lda sp,(REG_PROBE) */
+
+ cur_pc += ALPHA_INSN_SIZE;
+ insn = alpha_read_insn (gdbarch, cur_pc);
+ if (INSN_OPCODE (insn) != lda_opcode
+ || MEM_RA (insn) != ALPHA_SP_REGNUM
+ || MEM_RB (insn) != reg_probe)
+ return;
+ cur_frame_size -= MEM_DISP (insn);
+
+ *pc = cur_pc;
+ *frame_size = cur_frame_size;
+}
+
static struct alpha_heuristic_unwind_cache *
-alpha_heuristic_frame_unwind_cache (struct frame_info *next_frame,
+alpha_heuristic_frame_unwind_cache (struct frame_info *this_frame,
void **this_prologue_cache,
CORE_ADDR start_pc)
{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
struct alpha_heuristic_unwind_cache *info;
ULONGEST val;
CORE_ADDR limit_pc, cur_pc;
int frame_reg, frame_size, return_reg, reg;
if (*this_prologue_cache)
- return *this_prologue_cache;
+ return (struct alpha_heuristic_unwind_cache *) *this_prologue_cache;
info = FRAME_OBSTACK_ZALLOC (struct alpha_heuristic_unwind_cache);
*this_prologue_cache = info;
- info->saved_regs = frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS);
+ info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
- limit_pc = frame_pc_unwind (next_frame);
+ limit_pc = get_frame_pc (this_frame);
if (start_pc == 0)
- start_pc = alpha_heuristic_proc_start (limit_pc);
+ start_pc = alpha_heuristic_proc_start (gdbarch, limit_pc);
info->start_pc = start_pc;
frame_reg = ALPHA_SP_REGNUM;
@@ -1034,14 +1264,14 @@ alpha_heuristic_frame_unwind_cache (struct frame_info *next_frame,
for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += ALPHA_INSN_SIZE)
{
- unsigned int word = alpha_read_insn (cur_pc);
+ unsigned int word = alpha_read_insn (gdbarch, cur_pc);
if ((word & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */
{
if (word & 0x8000)
{
/* Consider only the first stack allocation instruction
- to contain the static size of the frame. */
+ to contain the static size of the frame. */
if (frame_size == 0)
frame_size = (-word) & 0xffff;
}
@@ -1057,15 +1287,15 @@ alpha_heuristic_frame_unwind_cache (struct frame_info *next_frame,
{
reg = (word & 0x03e00000) >> 21;
- /* Ignore this instruction if we have already encountered
- an instruction saving the same register earlier in the
- function code. The current instruction does not tell
- us where the original value upon function entry is saved.
- All it says is that the function we are scanning reused
- that register for some computation of its own, and is now
- saving its result. */
- if (info->saved_regs[reg])
- continue;
+ /* Ignore this instruction if we have already encountered
+ an instruction saving the same register earlier in the
+ function code. The current instruction does not tell
+ us where the original value upon function entry is saved.
+ All it says is that the function we are scanning reused
+ that register for some computation of its own, and is now
+ saving its result. */
+ if (info->saved_regs[reg].is_addr ())
+ continue;
if (reg == 31)
continue;
@@ -1080,7 +1310,7 @@ alpha_heuristic_frame_unwind_cache (struct frame_info *next_frame,
pointer or not. */
/* Hack: temporarily add one, so that the offset is non-zero
and we can tell which registers have save offsets below. */
- info->saved_regs[reg] = (word & 0xffff) + 1;
+ info->saved_regs[reg].set_addr ((word & 0xffff) + 1);
/* Starting with OSF/1-3.2C, the system libraries are shipped
without local symbols, but they still contain procedure
@@ -1097,10 +1327,11 @@ alpha_heuristic_frame_unwind_cache (struct frame_info *next_frame,
So we recognize only a few registers (t7, t9, ra) within
the procedure prologue as valid return address registers.
If we encounter a return instruction, we extract the
- the return address register from it.
+ return address register from it.
FIXME: Rewriting GDB to access the procedure descriptors,
- e.g. via the minimal symbol table, might obviate this hack. */
+ e.g. via the minimal symbol table, might obviate this
+ hack. */
if (return_reg == -1
&& cur_pc < (start_pc + 80)
&& (reg == ALPHA_T7_REGNUM
@@ -1114,6 +1345,8 @@ alpha_heuristic_frame_unwind_cache (struct frame_info *next_frame,
frame_reg = ALPHA_GCC_FP_REGNUM;
else if (word == 0x47fe040f) /* bis zero,sp,fp */
frame_reg = ALPHA_GCC_FP_REGNUM;
+
+ alpha_heuristic_analyze_probing_loop (gdbarch, &cur_pc, &frame_size);
}
/* If we haven't found a valid return address register yet, keep
@@ -1122,7 +1355,7 @@ alpha_heuristic_frame_unwind_cache (struct frame_info *next_frame,
{
while (cur_pc < (limit_pc + 80) && cur_pc < (start_pc + 80))
{
- unsigned int word = alpha_read_insn (cur_pc);
+ unsigned int word = alpha_read_insn (gdbarch, cur_pc);
if ((word & 0xfc1f0000) == 0xb41e0000) /* stq reg,n($sp) */
{
@@ -1151,14 +1384,20 @@ alpha_heuristic_frame_unwind_cache (struct frame_info *next_frame,
return_reg = ALPHA_RA_REGNUM;
info->return_reg = return_reg;
- frame_unwind_unsigned_register (next_frame, frame_reg, &val);
+ val = get_frame_register_unsigned (this_frame, frame_reg);
info->vfp = val + frame_size;
/* Convert offsets to absolute addresses. See above about adding
one to the offsets to make all detected offsets non-zero. */
for (reg = 0; reg < ALPHA_NUM_REGS; ++reg)
- if (info->saved_regs[reg])
- info->saved_regs[reg] += val - 1;
+ if (info->saved_regs[reg].is_addr ())
+ info->saved_regs[reg].set_addr (info->saved_regs[reg].addr ()
+ + val - 1);
+
+ /* The stack pointer of the previous frame is computed by popping
+ the current stack frame. */
+ if (!info->saved_regs[ALPHA_SP_REGNUM].is_addr ())
+ info->saved_regs[ALPHA_SP_REGNUM].set_value (info->vfp);
return info;
}
@@ -1167,27 +1406,24 @@ alpha_heuristic_frame_unwind_cache (struct frame_info *next_frame,
frame. This will be used to create a new GDB frame struct. */
static void
-alpha_heuristic_frame_this_id (struct frame_info *next_frame,
- void **this_prologue_cache,
- struct frame_id *this_id)
+alpha_heuristic_frame_this_id (struct frame_info *this_frame,
+ void **this_prologue_cache,
+ struct frame_id *this_id)
{
struct alpha_heuristic_unwind_cache *info
- = alpha_heuristic_frame_unwind_cache (next_frame, this_prologue_cache, 0);
+ = alpha_heuristic_frame_unwind_cache (this_frame, this_prologue_cache, 0);
*this_id = frame_id_build (info->vfp, info->start_pc);
}
/* Retrieve the value of REGNUM in FRAME. Don't give up! */
-static void
-alpha_heuristic_frame_prev_register (struct frame_info *next_frame,
- void **this_prologue_cache,
- int regnum, int *optimizedp,
- enum lval_type *lvalp, CORE_ADDR *addrp,
- int *realnump, gdb_byte *bufferp)
+static struct value *
+alpha_heuristic_frame_prev_register (struct frame_info *this_frame,
+ void **this_prologue_cache, int regnum)
{
struct alpha_heuristic_unwind_cache *info
- = alpha_heuristic_frame_unwind_cache (next_frame, this_prologue_cache, 0);
+ = alpha_heuristic_frame_unwind_cache (this_frame, this_prologue_cache, 0);
/* The PC of the previous frame is stored in the link register of
the current frame. Frob regnum so that we pull the value from
@@ -1195,59 +1431,26 @@ alpha_heuristic_frame_prev_register (struct frame_info *next_frame,
if (regnum == ALPHA_PC_REGNUM)
regnum = info->return_reg;
- /* For all registers known to be saved in the current frame,
- do the obvious and pull the value out. */
- if (info->saved_regs[regnum])
- {
- *optimizedp = 0;
- *lvalp = lval_memory;
- *addrp = info->saved_regs[regnum];
- *realnump = -1;
- if (bufferp != NULL)
- get_frame_memory (next_frame, *addrp, bufferp, ALPHA_REGISTER_SIZE);
- return;
- }
-
- /* The stack pointer of the previous frame is computed by popping
- the current stack frame. */
- if (regnum == ALPHA_SP_REGNUM)
- {
- *optimizedp = 0;
- *lvalp = not_lval;
- *addrp = 0;
- *realnump = -1;
- if (bufferp != NULL)
- store_unsigned_integer (bufferp, ALPHA_REGISTER_SIZE, info->vfp);
- return;
- }
-
- /* Otherwise assume the next frame has the same register value. */
- *optimizedp = 0;
- *lvalp = lval_register;
- *addrp = 0;
- *realnump = regnum;
- if (bufferp)
- frame_unwind_register (next_frame, *realnump, bufferp);
+ return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
}
-static const struct frame_unwind alpha_heuristic_frame_unwind = {
+static const struct frame_unwind alpha_heuristic_frame_unwind =
+{
+ "alpha prologue",
NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
alpha_heuristic_frame_this_id,
- alpha_heuristic_frame_prev_register
+ alpha_heuristic_frame_prev_register,
+ NULL,
+ default_frame_sniffer
};
-static const struct frame_unwind *
-alpha_heuristic_frame_sniffer (struct frame_info *next_frame)
-{
- return &alpha_heuristic_frame_unwind;
-}
-
static CORE_ADDR
-alpha_heuristic_frame_base_address (struct frame_info *next_frame,
+alpha_heuristic_frame_base_address (struct frame_info *this_frame,
void **this_prologue_cache)
{
struct alpha_heuristic_unwind_cache *info
- = alpha_heuristic_frame_unwind_cache (next_frame, this_prologue_cache, 0);
+ = alpha_heuristic_frame_unwind_cache (this_frame, this_prologue_cache, 0);
return info->vfp;
}
@@ -1263,33 +1466,11 @@ static const struct frame_base alpha_heuristic_frame_base = {
callable as an sfunc. Used by the "set heuristic-fence-post" command. */
static void
-reinit_frame_cache_sfunc (char *args, int from_tty, struct cmd_list_element *c)
+reinit_frame_cache_sfunc (const char *args,
+ int from_tty, struct cmd_list_element *c)
{
reinit_frame_cache ();
}
-
-
-/* Assuming NEXT_FRAME->prev is a dummy, return the frame ID of that
- dummy frame. The frame ID's base needs to match the TOS value
- saved by save_dummy_frame_tos(), and the PC match the dummy frame's
- breakpoint. */
-
-static struct frame_id
-alpha_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame)
-{
- ULONGEST base;
- frame_unwind_unsigned_register (next_frame, ALPHA_SP_REGNUM, &base);
- return frame_id_build (base, frame_pc_unwind (next_frame));
-}
-
-static CORE_ADDR
-alpha_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
-{
- ULONGEST pc;
- frame_unwind_unsigned_register (next_frame, ALPHA_PC_REGNUM, &pc);
- return pc;
-}
-
/* Helper routines for alpha*-nat.c files to move register sets to and
from core files. The UNIQUE pointer is allowed to be NULL, as most
@@ -1299,71 +1480,73 @@ void
alpha_supply_int_regs (struct regcache *regcache, int regno,
const void *r0_r30, const void *pc, const void *unique)
{
- const gdb_byte *regs = r0_r30;
+ const gdb_byte *regs = (const gdb_byte *) r0_r30;
int i;
for (i = 0; i < 31; ++i)
if (regno == i || regno == -1)
- regcache_raw_supply (regcache, i, regs + i * 8);
+ regcache->raw_supply (i, regs + i * 8);
if (regno == ALPHA_ZERO_REGNUM || regno == -1)
- regcache_raw_supply (regcache, ALPHA_ZERO_REGNUM, NULL);
+ {
+ const gdb_byte zero[8] = { 0 };
+
+ regcache->raw_supply (ALPHA_ZERO_REGNUM, zero);
+ }
if (regno == ALPHA_PC_REGNUM || regno == -1)
- regcache_raw_supply (regcache, ALPHA_PC_REGNUM, pc);
+ regcache->raw_supply (ALPHA_PC_REGNUM, pc);
if (regno == ALPHA_UNIQUE_REGNUM || regno == -1)
- regcache_raw_supply (regcache, ALPHA_UNIQUE_REGNUM, unique);
+ regcache->raw_supply (ALPHA_UNIQUE_REGNUM, unique);
}
void
alpha_fill_int_regs (const struct regcache *regcache,
int regno, void *r0_r30, void *pc, void *unique)
{
- gdb_byte *regs = r0_r30;
+ gdb_byte *regs = (gdb_byte *) r0_r30;
int i;
for (i = 0; i < 31; ++i)
if (regno == i || regno == -1)
- regcache_raw_collect (regcache, i, regs + i * 8);
+ regcache->raw_collect (i, regs + i * 8);
if (regno == ALPHA_PC_REGNUM || regno == -1)
- regcache_raw_collect (regcache, ALPHA_PC_REGNUM, pc);
+ regcache->raw_collect (ALPHA_PC_REGNUM, pc);
if (unique && (regno == ALPHA_UNIQUE_REGNUM || regno == -1))
- regcache_raw_collect (regcache, ALPHA_UNIQUE_REGNUM, unique);
+ regcache->raw_collect (ALPHA_UNIQUE_REGNUM, unique);
}
void
alpha_supply_fp_regs (struct regcache *regcache, int regno,
const void *f0_f30, const void *fpcr)
{
- const gdb_byte *regs = f0_f30;
+ const gdb_byte *regs = (const gdb_byte *) f0_f30;
int i;
for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; ++i)
if (regno == i || regno == -1)
- regcache_raw_supply (regcache, i,
- regs + (i - ALPHA_FP0_REGNUM) * 8);
+ regcache->raw_supply (i, regs + (i - ALPHA_FP0_REGNUM) * 8);
if (regno == ALPHA_FPCR_REGNUM || regno == -1)
- regcache_raw_supply (regcache, ALPHA_FPCR_REGNUM, fpcr);
+ regcache->raw_supply (ALPHA_FPCR_REGNUM, fpcr);
}
void
alpha_fill_fp_regs (const struct regcache *regcache,
int regno, void *f0_f30, void *fpcr)
{
- gdb_byte *regs = f0_f30;
+ gdb_byte *regs = (gdb_byte *) f0_f30;
int i;
for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; ++i)
if (regno == i || regno == -1)
- regcache_raw_collect (regcache, i,
- regs + (i - ALPHA_FP0_REGNUM) * 8);
+ regcache->raw_collect (i, regs + (i - ALPHA_FP0_REGNUM) * 8);
if (regno == ALPHA_FPCR_REGNUM || regno == -1)
- regcache_raw_collect (regcache, ALPHA_FPCR_REGNUM, fpcr);
+ regcache->raw_collect (ALPHA_FPCR_REGNUM, fpcr);
}
@@ -1397,35 +1580,36 @@ fp_register_sign_bit (LONGEST reg)
the target of the coming instruction and breakpoint it. */
static CORE_ADDR
-alpha_next_pc (struct frame_info *frame, CORE_ADDR pc)
+alpha_next_pc (struct regcache *regcache, CORE_ADDR pc)
{
+ struct gdbarch *gdbarch = regcache->arch ();
unsigned int insn;
unsigned int op;
int regno;
int offset;
LONGEST rav;
- insn = alpha_read_insn (pc);
+ insn = alpha_read_insn (gdbarch, pc);
- /* Opcode is top 6 bits. */
+ /* Opcode is top 6 bits. */
op = (insn >> 26) & 0x3f;
if (op == 0x1a)
{
/* Jump format: target PC is:
RB & ~3 */
- return (get_frame_register_unsigned (frame, (insn >> 16) & 0x1f) & ~3);
+ return (regcache_raw_get_unsigned (regcache, (insn >> 16) & 0x1f) & ~3);
}
if ((op & 0x30) == 0x30)
{
/* Branch format: target PC is:
(new PC) + (4 * sext(displacement)) */
- if (op == 0x30 || /* BR */
- op == 0x34) /* BSR */
+ if (op == 0x30 /* BR */
+ || op == 0x34) /* BSR */
{
branch_taken:
- offset = (insn & 0x001fffff);
+ offset = (insn & 0x001fffff);
if (offset & 0x00100000)
offset |= 0xffe00000;
offset *= ALPHA_INSN_SIZE;
@@ -1435,17 +1619,17 @@ alpha_next_pc (struct frame_info *frame, CORE_ADDR pc)
/* Need to determine if branch is taken; read RA. */
regno = (insn >> 21) & 0x1f;
switch (op)
- {
- case 0x31: /* FBEQ */
- case 0x36: /* FBGE */
- case 0x37: /* FBGT */
- case 0x33: /* FBLE */
- case 0x32: /* FBLT */
- case 0x35: /* FBNE */
- regno += gdbarch_fp0_regnum (get_frame_arch (frame));
+ {
+ case 0x31: /* FBEQ */
+ case 0x36: /* FBGE */
+ case 0x37: /* FBGT */
+ case 0x33: /* FBLE */
+ case 0x32: /* FBLT */
+ case 0x35: /* FBNE */
+ regno += gdbarch_fp0_regnum (gdbarch);
}
- rav = get_frame_register_signed (frame, regno);
+ rav = regcache_raw_get_signed (regcache, regno);
switch (op)
{
@@ -1482,32 +1666,32 @@ alpha_next_pc (struct frame_info *frame, CORE_ADDR pc)
goto branch_taken;
break;
- /* Floating point branches. */
-
- case 0x31: /* FBEQ */
- if (fp_register_zero_p (rav))
- goto branch_taken;
- break;
- case 0x36: /* FBGE */
- if (fp_register_sign_bit (rav) == 0 || fp_register_zero_p (rav))
- goto branch_taken;
- break;
- case 0x37: /* FBGT */
- if (fp_register_sign_bit (rav) == 0 && ! fp_register_zero_p (rav))
- goto branch_taken;
- break;
- case 0x33: /* FBLE */
- if (fp_register_sign_bit (rav) == 1 || fp_register_zero_p (rav))
- goto branch_taken;
- break;
- case 0x32: /* FBLT */
- if (fp_register_sign_bit (rav) == 1 && ! fp_register_zero_p (rav))
- goto branch_taken;
- break;
- case 0x35: /* FBNE */
- if (! fp_register_zero_p (rav))
- goto branch_taken;
- break;
+ /* Floating point branches. */
+
+ case 0x31: /* FBEQ */
+ if (fp_register_zero_p (rav))
+ goto branch_taken;
+ break;
+ case 0x36: /* FBGE */
+ if (fp_register_sign_bit (rav) == 0 || fp_register_zero_p (rav))
+ goto branch_taken;
+ break;
+ case 0x37: /* FBGT */
+ if (fp_register_sign_bit (rav) == 0 && ! fp_register_zero_p (rav))
+ goto branch_taken;
+ break;
+ case 0x33: /* FBLE */
+ if (fp_register_sign_bit (rav) == 1 || fp_register_zero_p (rav))
+ goto branch_taken;
+ break;
+ case 0x32: /* FBLT */
+ if (fp_register_sign_bit (rav) == 1 && ! fp_register_zero_p (rav))
+ goto branch_taken;
+ break;
+ case 0x35: /* FBNE */
+ if (! fp_register_zero_p (rav))
+ goto branch_taken;
+ break;
}
}
@@ -1516,16 +1700,20 @@ alpha_next_pc (struct frame_info *frame, CORE_ADDR pc)
return (pc + ALPHA_INSN_SIZE);
}
-int
-alpha_software_single_step (struct frame_info *frame)
+std::vector
+alpha_software_single_step (struct regcache *regcache)
{
- CORE_ADDR pc, next_pc;
+ struct gdbarch *gdbarch = regcache->arch ();
- pc = get_frame_pc (frame);
- next_pc = alpha_next_pc (frame, pc);
+ CORE_ADDR pc = regcache_read_pc (regcache);
- insert_single_step_breakpoint (next_pc);
- return 1;
+ std::vector next_pcs
+ = alpha_deal_with_atomic_sequence (gdbarch, pc);
+ if (!next_pcs.empty ())
+ return next_pcs;
+
+ CORE_ADDR next_pc = alpha_next_pc (regcache, pc);
+ return {next_pc};
}
@@ -1539,23 +1727,14 @@ alpha_software_single_step (struct frame_info *frame)
static struct gdbarch *
alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
- struct gdbarch_tdep *tdep;
struct gdbarch *gdbarch;
- /* Try to determine the ABI of the object we are loading. */
- if (info.abfd != NULL && info.osabi == GDB_OSABI_UNKNOWN)
- {
- /* If it's an ECOFF file, assume it's OSF/1. */
- if (bfd_get_flavour (info.abfd) == bfd_target_ecoff_flavour)
- info.osabi = GDB_OSABI_OSF1;
- }
-
/* Find a candidate among extant architectures. */
arches = gdbarch_list_lookup_by_info (arches, &info);
if (arches != NULL)
return arches->gdbarch;
- tdep = xmalloc (sizeof (struct gdbarch_tdep));
+ alpha_gdbarch_tdep *tdep = new alpha_gdbarch_tdep;
gdbarch = gdbarch_alloc (&info, tdep);
/* Lowest text address. This is used by heuristic_proc_start()
@@ -1568,7 +1747,7 @@ alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
tdep->sc_regs_offset = 4 * 8;
tdep->sc_fpregs_offset = tdep->sc_regs_offset + 32 * 8 + 8;
- tdep->jb_pc = -1; /* longjmp support not enabled by default */
+ tdep->jb_pc = -1; /* longjmp support not enabled by default. */
tdep->return_in_memory = alpha_return_in_memory_always;
@@ -1577,6 +1756,8 @@ alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
set_gdbarch_int_bit (gdbarch, 32);
set_gdbarch_long_bit (gdbarch, 64);
set_gdbarch_long_long_bit (gdbarch, 64);
+ set_gdbarch_wchar_bit (gdbarch, 64);
+ set_gdbarch_wchar_signed (gdbarch, 0);
set_gdbarch_float_bit (gdbarch, 32);
set_gdbarch_double_bit (gdbarch, 64);
set_gdbarch_long_double_bit (gdbarch, 64);
@@ -1603,9 +1784,6 @@ alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
/* Prologue heuristics. */
set_gdbarch_skip_prologue (gdbarch, alpha_skip_prologue);
- /* Disassembler. */
- set_gdbarch_print_insn (gdbarch, print_insn_alpha);
-
/* Call info. */
set_gdbarch_return_value (gdbarch, alpha_return_value);
@@ -1613,19 +1791,19 @@ alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
/* Settings for calling functions in the inferior. */
set_gdbarch_push_dummy_call (gdbarch, alpha_push_dummy_call);
- /* Methods for saving / extracting a dummy frame's ID. */
- set_gdbarch_unwind_dummy_id (gdbarch, alpha_unwind_dummy_id);
-
- /* Return the unwound PC value. */
- set_gdbarch_unwind_pc (gdbarch, alpha_unwind_pc);
-
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
- set_gdbarch_breakpoint_from_pc (gdbarch, alpha_breakpoint_from_pc);
+ set_gdbarch_breakpoint_kind_from_pc (gdbarch,
+ alpha_breakpoint::kind_from_pc);
+ set_gdbarch_sw_breakpoint_from_kind (gdbarch,
+ alpha_breakpoint::bp_from_kind);
set_gdbarch_decr_pc_after_break (gdbarch, ALPHA_INSN_SIZE);
set_gdbarch_cannot_step_breakpoint (gdbarch, 1);
+ /* Handles single stepping of atomic sequences. */
+ set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
+
/* Hook in ABI-specific overrides, if they have been registered. */
gdbarch_init_osabi (info, gdbarch);
@@ -1635,8 +1813,8 @@ alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
if (tdep->jb_pc >= 0)
set_gdbarch_get_longjmp_target (gdbarch, alpha_get_longjmp_target);
- frame_unwind_append_sniffer (gdbarch, alpha_sigtramp_frame_sniffer);
- frame_unwind_append_sniffer (gdbarch, alpha_heuristic_frame_sniffer);
+ frame_unwind_append_unwinder (gdbarch, &alpha_sigtramp_frame_unwind);
+ frame_unwind_append_unwinder (gdbarch, &alpha_heuristic_frame_unwind);
frame_base_set_default (gdbarch, &alpha_heuristic_frame_base);
@@ -1646,16 +1824,14 @@ alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
void
alpha_dwarf2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
- frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
+ dwarf2_append_unwinders (gdbarch);
frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
}
-extern initialize_file_ftype _initialize_alpha_tdep; /* -Wmissing-prototypes */
-
+void _initialize_alpha_tdep ();
void
-_initialize_alpha_tdep (void)
+_initialize_alpha_tdep ()
{
- struct cmd_list_element *c;
gdbarch_register (bfd_arch_alpha, alpha_gdbarch_init, NULL);
@@ -1674,6 +1850,7 @@ If you are debugging a stripped executable, GDB needs to search through the\n\
program for the start of a function. This command sets the distance of the\n\
search. The only need to set it is when debugging a stripped executable."),
reinit_frame_cache_sfunc,
- NULL, /* FIXME: i18n: The distance searched for the start of a function is \"%d\". */
+ NULL, /* FIXME: i18n: The distance searched for
+ the start of a function is \"%d\". */
&setlist, &showlist);
}