--- /dev/null
+/* Definitions to target GDB to Linux on 386.
+ Copyright 1992, 1993 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+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
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+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. */
+
+#ifndef TM_LINUX_H
+#define TM_LINUX_H
+
+#include "powerpc/tm-ppc-eabi.h"
+
+#undef PUSH_ARGUMENTS
+
+/* We can single step on linux */
+#undef SOFTWARE_SINGLE_STEP
+#define SOFTWARE_SINGLE_STEP(p,q) abort() /* Will never execute! */
+#undef SOFTWARE_SINGLE_STEP_P
+#define SOFTWARE_SINGLE_STEP_P 0
+
+/* Make sure nexti gets the help it needs for debugging assembly code
+ without symbols */
+
+#define AT_SUBROUTINE_CALL_INSTRUCTION_TARGET(prevpc,stoppc) \
+ at_subroutine_call_instruction_target(prevpc,stoppc)
+extern int at_subroutine_call_instruction_target();
+
+/* We _want_ the SVR4 section offset calculations (see syms_from_objfile()
+ in symfile.c) */
+#undef IBM6000_TARGET
+
+/* Offset to saved PC in sigcontext, from <linux/signal.h>. */
+#define SIGCONTEXT_PC_OFFSET 184
+
+/* Avoid warning from redefinition in tm-sysv4.h */
+#undef SKIP_TRAMPOLINE_CODE
+
+/* We need this file for the SOLIB_TRAMPOLINE stuff. */
+#include "tm-sysv4.h"
+
+extern CORE_ADDR ppc_linux_skip_trampoline_code (CORE_ADDR pc);
+#undef SKIP_TRAMPOLINE_CODE
+#define SKIP_TRAMPOLINE_CODE(pc) ppc_linux_skip_trampoline_code (pc)
+
+extern int ppc_linux_in_sigtramp (CORE_ADDR pc, char *func_name);
+#undef IN_SIGTRAMP
+#define IN_SIGTRAMP(pc,func_name) ppc_linux_in_sigtramp (pc,func_name)
+
+extern unsigned long ppc_linux_frame_saved_pc (struct frame_info *);
+#undef FRAME_SAVED_PC
+#define FRAME_SAVED_PC(FRAME) ppc_linux_frame_saved_pc (FRAME)
+
+extern void ppc_linux_init_extra_frame_info (int fromleaf, struct frame_info *);
+#undef INIT_EXTRA_FRAME_INFO
+#define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
+ ppc_linux_init_extra_frame_info (fromleaf, fi)
+
+extern int ppc_linux_frameless_function_invocation (struct frame_info *);
+#undef FRAMELESS_FUNCTION_INVOCATION
+#define FRAMELESS_FUNCTION_INVOCATION(FI) \
+ (ppc_linux_frameless_function_invocation (FI))
+
+extern void ppc_linux_frame_init_saved_regs (struct frame_info *);
+#undef FRAME_INIT_SAVED_REGS
+#define FRAME_INIT_SAVED_REGS(FI) ppc_linux_frame_init_saved_regs (FI)
+
+CORE_ADDR ppc_linux_frame_chain (struct frame_info *);
+#undef FRAME_CHAIN
+#define FRAME_CHAIN(thisframe) ppc_linux_frame_chain (thisframe)
+
+CORE_ADDR ppc_sysv_abi_push_arguments PARAMS ((int, struct value **, CORE_ADDR, int, CORE_ADDR));
+#undef PUSH_ARGUMENTS
+#define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
+ (ppc_sysv_abi_push_arguments((nargs), (args), (sp), (struct_return), (struct_addr)))
+
+#define CANNOT_FETCH_REGISTER(regno) ((regno) >= MQ_REGNUM)
+#define CANNOT_STORE_REGISTER(regno) ((regno) >= MQ_REGNUM)
+
+/* Linux doesn't use the PowerOpen ABI for function pointer representation */
+#undef CONVERT_FROM_FUNC_PTR_ADDR
+
+#if 0 /* If skip_prologue() isn't too greedy, we don't need this */
+/* There is some problem with the debugging symbols generated by the
+ compiler such that the debugging symbol for the first line of a
+ function overlap with the function prologue. */
+#define PROLOGUE_FIRSTLINE_OVERLAP
+#endif
+
+/* Some versions of Linux have real-time signal support in the C library, and
+ some don't. We have to include this file to find out. */
+#include <signal.h>
+
+#ifdef __SIGRTMIN
+#define REALTIME_LO __SIGRTMIN
+#define REALTIME_HI (__SIGRTMAX + 1)
+#else
+#define REALTIME_LO 32
+#define REALTIME_HI 64
+#endif
+
+#endif /* #ifndef TM_LINUX_H */
--- /dev/null
+/* PPC linux native support.
+ Copyright (C) 1988, 1989, 1991, 1992, 1994, 1996 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ 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
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ 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. */
+
+#include "defs.h"
+#include "frame.h"
+#include "inferior.h"
+#include "gdbcore.h"
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <signal.h>
+#include <sys/user.h>
+#include <sys/ioctl.h>
+#include <sys/wait.h>
+#include <fcntl.h>
+#include <sys/procfs.h>
+
+int
+kernel_u_size ()
+{
+ return (sizeof (struct user));
+}
+
+static int regmap[] =
+{PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
+ PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_R13, PT_R14, PT_R15,
+ PT_R16, PT_R17, PT_R18, PT_R19, PT_R20, PT_R21, PT_R22, PT_R23,
+ PT_R24, PT_R25, PT_R26, PT_R27, PT_R28, PT_R29, PT_R30, PT_R31,
+ PT_FPR0, PT_FPR0 + 2, PT_FPR0 + 4, PT_FPR0 + 6, PT_FPR0 + 8, PT_FPR0 + 10, PT_FPR0 + 12, PT_FPR0 + 14,
+ PT_FPR0 + 16, PT_FPR0 + 18, PT_FPR0 + 20, PT_FPR0 + 22, PT_FPR0 + 24, PT_FPR0 + 26, PT_FPR0 + 28, PT_FPR0 + 30,
+ PT_FPR0 + 32, PT_FPR0 + 34, PT_FPR0 + 36, PT_FPR0 + 38, PT_FPR0 + 40, PT_FPR0 + 42, PT_FPR0 + 44, PT_FPR0 + 46,
+ PT_FPR0 + 48, PT_FPR0 + 50, PT_FPR0 + 52, PT_FPR0 + 54, PT_FPR0 + 56, PT_FPR0 + 58, PT_FPR0 + 60, PT_FPR0 + 62,
+ PT_NIP, PT_MSR, PT_CCR, PT_LNK, PT_CTR, PT_XER, PT_MQ};
+
+int
+ppc_register_u_addr (int ustart, int regnum)
+{
+ return (ustart + 4 * regmap[regnum]);
+}
+
+supply_gregset (gregset_t * gregsetp)
+{
+ int regi;
+ register greg_t *regp = (greg_t *) gregsetp;
+
+ for (regi = 0; regi < 32; regi++)
+ supply_register (regi, (char *) (regp + regi));
+
+ for (regi = FIRST_UISA_SP_REGNUM; regi <= LAST_UISA_SP_REGNUM; regi++)
+ supply_register (regi, (char *) (regp + regmap[regi]));
+}
+
+supply_fpregset (fpregset_t * fpregsetp)
+{
+ int regi;
+ for (regi = 0; regi < 32; regi++)
+ {
+ supply_register (FP0_REGNUM + regi, (char *) (*fpregsetp + regi));
+ }
+}
--- /dev/null
+/* Target-dependent code for GDB, the GNU debugger.
+ Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
+ Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ 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
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ 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. */
+
+#include "defs.h"
+#include "frame.h"
+#include "inferior.h"
+#include "symtab.h"
+#include "target.h"
+#include "gdbcore.h"
+#include "gdbcmd.h"
+#include "symfile.h"
+#include "objfiles.h"
+
+/* The following two instructions are used in the signal trampoline
+ code on linux/ppc */
+#define INSTR_LI_R0_0x7777 0x38007777
+#define INSTR_SC 0x44000002
+
+/* Since the *-tdep.c files are platform independent (i.e, they may be
+ used to build cross platform debuggers), we can't include system
+ headers. Therefore, details concerning the sigcontext structure
+ must be painstakingly rerecorded. What's worse, if these details
+ ever change in the header files, they'll have to be changed here
+ as well. */
+
+/* __SIGNAL_FRAMESIZE from <asm/ptrace.h> */
+#define PPC_LINUX_SIGNAL_FRAMESIZE 64
+
+/* From <asm/sigcontext.h>, offsetof(struct sigcontext_struct, regs) == 0x1c */
+#define PPC_LINUX_REGS_PTR_OFFSET (PPC_LINUX_SIGNAL_FRAMESIZE + 0x1c)
+
+/* From <asm/sigcontext.h>,
+ offsetof(struct sigcontext_struct, handler) == 0x14 */
+#define PPC_LINUX_HANDLER_PTR_OFFSET (PPC_LINUX_SIGNAL_FRAMESIZE + 0x14)
+
+/* From <asm/ptrace.h>, values for PT_NIP, PT_R1, and PT_LNK */
+#define PPC_LINUX_PT_R0 0
+#define PPC_LINUX_PT_R1 1
+#define PPC_LINUX_PT_R2 2
+#define PPC_LINUX_PT_R3 3
+#define PPC_LINUX_PT_R4 4
+#define PPC_LINUX_PT_R5 5
+#define PPC_LINUX_PT_R6 6
+#define PPC_LINUX_PT_R7 7
+#define PPC_LINUX_PT_R8 8
+#define PPC_LINUX_PT_R9 9
+#define PPC_LINUX_PT_R10 10
+#define PPC_LINUX_PT_R11 11
+#define PPC_LINUX_PT_R12 12
+#define PPC_LINUX_PT_R13 13
+#define PPC_LINUX_PT_R14 14
+#define PPC_LINUX_PT_R15 15
+#define PPC_LINUX_PT_R16 16
+#define PPC_LINUX_PT_R17 17
+#define PPC_LINUX_PT_R18 18
+#define PPC_LINUX_PT_R19 19
+#define PPC_LINUX_PT_R20 20
+#define PPC_LINUX_PT_R21 21
+#define PPC_LINUX_PT_R22 22
+#define PPC_LINUX_PT_R23 23
+#define PPC_LINUX_PT_R24 24
+#define PPC_LINUX_PT_R25 25
+#define PPC_LINUX_PT_R26 26
+#define PPC_LINUX_PT_R27 27
+#define PPC_LINUX_PT_R28 28
+#define PPC_LINUX_PT_R29 29
+#define PPC_LINUX_PT_R30 30
+#define PPC_LINUX_PT_R31 31
+#define PPC_LINUX_PT_NIP 32
+#define PPC_LINUX_PT_MSR 33
+#define PPC_LINUX_PT_CTR 35
+#define PPC_LINUX_PT_LNK 36
+#define PPC_LINUX_PT_XER 37
+#define PPC_LINUX_PT_CCR 38
+#define PPC_LINUX_PT_MQ 39
+#define PPC_LINUX_PT_FPR0 48 /* each FP reg occupies 2 slots in this space */
+#define PPC_LINUX_PT_FPR31 (PPC_LINUX_PT_FPR0 + 2*31)
+#define PPC_LINUX_PT_FPSCR (PPC_LINUX_PT_FPR0 + 2*32 + 1)
+
+/* Determine if pc is in a signal trampoline...
+
+ Ha! That's not what this does at all. wait_for_inferior in infrun.c
+ calls IN_SIGTRAMP in order to detect entry into a signal trampoline
+ just after delivery of a signal. But on linux, signal trampolines
+ are used for the return path only. The kernel sets things up so that
+ the signal handler is called directly.
+
+ If we use in_sigtramp2() in place of in_sigtramp() (see below)
+ we'll (often) end up with stop_pc in the trampoline and prev_pc in
+ the (now exited) handler. The code there will cause a temporary
+ breakpoint to be set on prev_pc which is not very likely to get hit
+ again.
+
+ If this is confusing, think of it this way... the code in
+ wait_for_inferior() needs to be able to detect entry into a signal
+ trampoline just after a signal is delivered, not after the handler
+ has been run.
+
+ So, we define in_sigtramp() below to return 1 if the following is
+ true:
+
+ 1) The previous frame is a real signal trampoline.
+
+ - and -
+
+ 2) pc is at the first or second instruction of the corresponding
+ handler.
+
+ Why the second instruction? It seems that wait_for_inferior()
+ never sees the first instruction when single stepping. When a
+ signal is delivered while stepping, the next instruction that
+ would've been stepped over isn't, instead a signal is delivered and
+ the first instruction of the handler is stepped over instead. That
+ puts us on the second instruction. (I added the test for the
+ first instruction long after the fact, just in case the observed
+ behavior is ever fixed.)
+
+ IN_SIGTRAMP is called from blockframe.c as well in order to set
+ the signal_handler_caller flag. Because of our strange definition
+ of in_sigtramp below, we can't rely on signal_handler_caller getting
+ set correctly from within blockframe.c. This is why we take pains
+ to set it in init_extra_frame_info(). */
+
+int
+ppc_linux_in_sigtramp (CORE_ADDR pc, char *func_name)
+{
+ CORE_ADDR lr;
+ CORE_ADDR sp;
+ CORE_ADDR tramp_sp;
+ char buf[4];
+ CORE_ADDR handler;
+
+ lr = read_register (LR_REGNUM);
+ if (!ppc_linux_at_sigtramp_return_path (lr))
+ return 0;
+
+ sp = read_register (SP_REGNUM);
+
+ if (target_read_memory (sp, buf, sizeof (buf)) != 0)
+ return 0;
+
+ tramp_sp = extract_unsigned_integer (buf, 4);
+
+ if (target_read_memory (tramp_sp + PPC_LINUX_HANDLER_PTR_OFFSET, buf,
+ sizeof (buf)) != 0)
+ return 0;
+
+ handler = extract_unsigned_integer (buf, 4);
+
+ return (pc == handler || pc == handler + 4);
+}
+
+/*
+ * The signal handler trampoline is on the stack and consists of exactly
+ * two instructions. The easiest and most accurate way of determining
+ * whether the pc is in one of these trampolines is by inspecting the
+ * instructions. It'd be faster though if we could find a way to do this
+ * via some simple address comparisons.
+ */
+int
+ppc_linux_at_sigtramp_return_path (CORE_ADDR pc)
+{
+ char buf[12];
+ unsigned long pcinsn;
+ if (target_read_memory (pc - 4, buf, sizeof (buf)) != 0)
+ return 0;
+
+ /* extract the instruction at the pc */
+ pcinsn = extract_unsigned_integer (buf + 4, 4);
+
+ return (
+ (pcinsn == INSTR_LI_R0_0x7777
+ && extract_unsigned_integer (buf + 8, 4) == INSTR_SC)
+ ||
+ (pcinsn == INSTR_SC
+ && extract_unsigned_integer (buf, 4) == INSTR_LI_R0_0x7777));
+}
+
+CORE_ADDR
+ppc_linux_skip_trampoline_code (CORE_ADDR pc)
+{
+ char buf[4];
+ struct obj_section *sect;
+ struct objfile *objfile;
+ unsigned long insn;
+ CORE_ADDR plt_start = 0;
+ CORE_ADDR symtab = 0;
+ CORE_ADDR strtab = 0;
+ int num_slots = -1;
+ int reloc_index = -1;
+ CORE_ADDR plt_table;
+ CORE_ADDR reloc;
+ CORE_ADDR sym;
+ long symidx;
+ char symname[1024];
+ struct minimal_symbol *msymbol;
+
+ /* Find the section pc is in; return if not in .plt */
+ sect = find_pc_section (pc);
+ if (!sect || strcmp (sect->the_bfd_section->name, ".plt") != 0)
+ return 0;
+
+ objfile = sect->objfile;
+
+ /* Pick up the instruction at pc. It had better be of the
+ form
+ li r11, IDX
+
+ where IDX is an index into the plt_table. */
+
+ if (target_read_memory (pc, buf, 4) != 0)
+ return 0;
+ insn = extract_unsigned_integer (buf, 4);
+
+ if ((insn & 0xffff0000) != 0x39600000 /* li r11, VAL */ )
+ return 0;
+
+ reloc_index = (insn << 16) >> 16;
+
+ /* Find the objfile that pc is in and obtain the information
+ necessary for finding the symbol name. */
+ for (sect = objfile->sections; sect < objfile->sections_end; ++sect)
+ {
+ const char *secname = sect->the_bfd_section->name;
+ if (strcmp (secname, ".plt") == 0)
+ plt_start = sect->addr;
+ else if (strcmp (secname, ".rela.plt") == 0)
+ num_slots = ((int) sect->endaddr - (int) sect->addr) / 12;
+ else if (strcmp (secname, ".dynsym") == 0)
+ symtab = sect->addr;
+ else if (strcmp (secname, ".dynstr") == 0)
+ strtab = sect->addr;
+ }
+
+ /* Make sure we have all the information we need. */
+ if (plt_start == 0 || num_slots == -1 || symtab == 0 || strtab == 0)
+ return 0;
+
+ /* Compute the value of the plt table */
+ plt_table = plt_start + 72 + 8 * num_slots;
+
+ /* Get address of the relocation entry (Elf32_Rela) */
+ if (target_read_memory (plt_table + reloc_index, buf, 4) != 0)
+ return 0;
+ reloc = extract_address (buf, 4);
+
+ sect = find_pc_section (reloc);
+ if (!sect)
+ return 0;
+
+ if (strcmp (sect->the_bfd_section->name, ".text") == 0)
+ return reloc;
+
+ /* Now get the r_info field which is the relocation type and symbol
+ index. */
+ if (target_read_memory (reloc + 4, buf, 4) != 0)
+ return 0;
+ symidx = extract_unsigned_integer (buf, 4);
+
+ /* Shift out the relocation type leaving just the symbol index */
+ /* symidx = ELF32_R_SYM(symidx); */
+ symidx = symidx >> 8;
+
+ /* compute the address of the symbol */
+ sym = symtab + symidx * 4;
+
+ /* Fetch the string table index */
+ if (target_read_memory (sym, buf, 4) != 0)
+ return 0;
+ symidx = extract_unsigned_integer (buf, 4);
+
+ /* Fetch the string; we don't know how long it is. Is it possible
+ that the following will fail because we're trying to fetch too
+ much? */
+ if (target_read_memory (strtab + symidx, symname, sizeof (symname)) != 0)
+ return 0;
+
+ /* This might not work right if we have multiple symbols with the
+ same name; the only way to really get it right is to perform
+ the same sort of lookup as the dynamic linker. */
+ msymbol = lookup_minimal_symbol_text (symname, NULL, NULL);
+ if (!msymbol)
+ return 0;
+
+ return SYMBOL_VALUE_ADDRESS (msymbol);
+}
+
+/* The rs6000 version of FRAME_SAVED_PC will almost work for us. The
+ signal handler details are different, so we'll handle those here
+ and call the rs6000 version to do the rest. */
+unsigned long
+ppc_linux_frame_saved_pc (struct frame_info *fi)
+{
+ if (fi->signal_handler_caller)
+ {
+ CORE_ADDR regs_addr =
+ read_memory_integer (fi->frame + PPC_LINUX_REGS_PTR_OFFSET, 4);
+ /* return the NIP in the regs array */
+ return read_memory_integer (regs_addr + 4 * PPC_LINUX_PT_NIP, 4);
+ }
+
+ return rs6000_frame_saved_pc (fi);
+}
+
+void
+ppc_linux_init_extra_frame_info (int fromleaf, struct frame_info *fi)
+{
+ rs6000_init_extra_frame_info (fromleaf, fi);
+
+ if (fi->next != 0)
+ {
+ /* We're called from get_prev_frame_info; check to see if
+ this is a signal frame by looking to see if the pc points
+ at trampoline code */
+ if (ppc_linux_at_sigtramp_return_path (fi->pc))
+ fi->signal_handler_caller = 1;
+ else
+ fi->signal_handler_caller = 0;
+ }
+}
+
+int
+ppc_linux_frameless_function_invocation (struct frame_info *fi)
+{
+ /* We'll find the wrong thing if we let
+ rs6000_frameless_function_invocation () search for a signal trampoline */
+ if (ppc_linux_at_sigtramp_return_path (fi->pc))
+ return 0;
+ else
+ return rs6000_frameless_function_invocation (fi);
+}
+
+void
+ppc_linux_frame_init_saved_regs (struct frame_info *fi)
+{
+ if (fi->signal_handler_caller)
+ {
+ CORE_ADDR regs_addr;
+ int i;
+ if (fi->saved_regs)
+ return;
+
+ frame_saved_regs_zalloc (fi);
+
+ regs_addr =
+ read_memory_integer (fi->frame + PPC_LINUX_REGS_PTR_OFFSET, 4);
+ fi->saved_regs[PC_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_NIP;
+ fi->saved_regs[PS_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_MSR;
+ fi->saved_regs[CR_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_CCR;
+ fi->saved_regs[LR_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_LNK;
+ fi->saved_regs[CTR_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_CTR;
+ fi->saved_regs[XER_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_XER;
+ fi->saved_regs[MQ_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_MQ;
+ for (i = 0; i < 32; i++)
+ fi->saved_regs[GP0_REGNUM + i] = regs_addr + 4 * PPC_LINUX_PT_R0 + 4 * i;
+ for (i = 0; i < 32; i++)
+ fi->saved_regs[FP0_REGNUM + i] = regs_addr + 4 * PPC_LINUX_PT_FPR0 + 8 * i;
+ }
+ else
+ rs6000_frame_init_saved_regs (fi);
+}
+
+CORE_ADDR
+ppc_linux_frame_chain (struct frame_info *thisframe)
+{
+ /* Kernel properly constructs the frame chain for the handler */
+ if (thisframe->signal_handler_caller)
+ return read_memory_integer ((thisframe)->frame, 4);
+ else
+ return rs6000_frame_chain (thisframe);
+}
+
+/* FIXME: Move the following to rs6000-tdep.c (or some other file where
+ it may be used generically by ports which use either the SysV ABI or
+ the EABI */
+
+/* round2 rounds x up to the nearest multiple of s assuming that s is a
+ power of 2 */
+
+#undef round2
+#define round2(x,s) ((((long) (x) - 1) & ~(long)((s)-1)) + (s))
+
+/* Pass the arguments in either registers, or in the stack. Using the
+ ppc sysv ABI, the first eight words of the argument list (that might
+ be less than eight parameters if some parameters occupy more than one
+ word) are passed in r3..r10 registers. float and double parameters are
+ passed in fpr's, in addition to that. Rest of the parameters if any
+ are passed in user stack.
+
+ If the function is returning a structure, then the return address is passed
+ in r3, then the first 7 words of the parametes can be passed in registers,
+ starting from r4. */
+
+CORE_ADDR
+ppc_sysv_abi_push_arguments (nargs, args, sp, struct_return, struct_addr)
+ int nargs;
+ value_ptr *args;
+ CORE_ADDR sp;
+ int struct_return;
+ CORE_ADDR struct_addr;
+{
+ int argno;
+ int greg, freg;
+ int argstkspace;
+ int structstkspace;
+ int argoffset;
+ int structoffset;
+ value_ptr arg;
+ struct type *type;
+ int len;
+ char old_sp_buf[4];
+ CORE_ADDR saved_sp;
+
+ greg = struct_return ? 4 : 3;
+ freg = 1;
+ argstkspace = 0;
+ structstkspace = 0;
+
+ /* Figure out how much new stack space is required for arguments
+ which don't fit in registers. Unlike the PowerOpen ABI, the
+ SysV ABI doesn't reserve any extra space for parameters which
+ are put in registers. */
+ for (argno = 0; argno < nargs; argno++)
+ {
+ arg = args[argno];
+ type = check_typedef (VALUE_TYPE (arg));
+ len = TYPE_LENGTH (type);
+
+ if (TYPE_CODE (type) == TYPE_CODE_FLT)
+ {
+ if (freg <= 8)
+ freg++;
+ else
+ {
+ /* SysV ABI converts floats to doubles when placed in
+ memory and requires 8 byte alignment */
+ if (argstkspace & 0x4)
+ argstkspace += 4;
+ argstkspace += 8;
+ }
+ }
+ else if (TYPE_CODE (type) == TYPE_CODE_INT && len == 8) /* long long */
+ {
+ if (greg > 9)
+ {
+ greg = 11;
+ if (argstkspace & 0x4)
+ argstkspace += 4;
+ argstkspace += 8;
+ }
+ else
+ {
+ if ((greg & 1) == 0)
+ greg++;
+ greg += 2;
+ }
+ }
+ else
+ {
+ if (len > 4
+ || TYPE_CODE (type) == TYPE_CODE_STRUCT
+ || TYPE_CODE (type) == TYPE_CODE_UNION)
+ {
+ /* Rounding to the nearest multiple of 8 may not be necessary,
+ but it is safe. Particularly since we don't know the
+ field types of the structure */
+ structstkspace += round2 (len, 8);
+ }
+ if (greg <= 10)
+ greg++;
+ else
+ argstkspace += 4;
+ }
+ }
+
+ /* Get current SP location */
+ saved_sp = read_sp ();
+
+ sp -= argstkspace + structstkspace;
+
+ /* Allocate space for backchain and callee's saved lr */
+ sp -= 8;
+
+ /* Make sure that we maintain 16 byte alignment */
+ sp &= ~0x0f;
+
+ /* Update %sp before proceeding any further */
+ write_register (SP_REGNUM, sp);
+
+ /* write the backchain */
+ store_address (old_sp_buf, 4, saved_sp);
+ write_memory (sp, old_sp_buf, 4);
+
+ argoffset = 8;
+ structoffset = argoffset + argstkspace;
+ freg = 1;
+ greg = 3;
+ /* Now fill in the registers and stack... */
+ for (argno = 0; argno < nargs; argno++)
+ {
+ arg = args[argno];
+ type = check_typedef (VALUE_TYPE (arg));
+ len = TYPE_LENGTH (type);
+
+ if (TYPE_CODE (type) == TYPE_CODE_FLT)
+ {
+ if (freg <= 8)
+ {
+ if (len > 8)
+ printf_unfiltered (
+ "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno);
+ memcpy (®isters[REGISTER_BYTE (FP0_REGNUM + freg)],
+ VALUE_CONTENTS (arg), len);
+ freg++;
+ }
+ else
+ {
+ /* SysV ABI converts floats to doubles when placed in
+ memory and requires 8 byte alignment */
+ /* FIXME: Convert floats to doubles */
+ if (argoffset & 0x4)
+ argoffset += 4;
+ write_memory (sp + argoffset, (char *) VALUE_CONTENTS (arg), len);
+ argoffset += 8;
+ }
+ }
+ else if (TYPE_CODE (type) == TYPE_CODE_INT && len == 8) /* long long */
+ {
+ if (greg > 9)
+ {
+ greg = 11;
+ if (argoffset & 0x4)
+ argoffset += 4;
+ write_memory (sp + argoffset, (char *) VALUE_CONTENTS (arg), len);
+ argoffset += 8;
+ }
+ else
+ {
+ if ((greg & 1) == 0)
+ greg++;
+
+ memcpy (®isters[REGISTER_BYTE (greg)],
+ VALUE_CONTENTS (arg), 4);
+ memcpy (®isters[REGISTER_BYTE (greg + 1)],
+ VALUE_CONTENTS (arg) + 4, 4);
+ greg += 2;
+ }
+ }
+ else
+ {
+ char val_buf[4];
+ if (len > 4
+ || TYPE_CODE (type) == TYPE_CODE_STRUCT
+ || TYPE_CODE (type) == TYPE_CODE_UNION)
+ {
+ write_memory (sp + structoffset, VALUE_CONTENTS (arg), len);
+ store_address (val_buf, 4, sp + structoffset);
+ structoffset += round2 (len, 8);
+ }
+ else
+ {
+ memset (val_buf, 0, 4);
+ memcpy (val_buf, VALUE_CONTENTS (arg), len);
+ }
+ if (greg <= 10)
+ {
+ *(int *) ®isters[REGISTER_BYTE (greg)] = 0;
+ memcpy (®isters[REGISTER_BYTE (greg)], val_buf, 4);
+ greg++;
+ }
+ else
+ {
+ write_memory (sp + argoffset, val_buf, 4);
+ argoffset += 4;
+ }
+ }
+ }
+
+ target_store_registers (-1);
+ return sp;
+}
projects / binutils-gdb.git / commitdiff