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1bac305b72
* ax-gdb.c, c-valprint.c, charset.c, corefile.c: Update copyright. * demangle.c, disasm.c, dwarf2cfi.c, dwarfread.c: Update copyright. * elfread.c, eval.c, expprint.c, expression.h: Update copyright. * f-typeprint.c, findvar.c, gcore.c, gdb_mbuild.sh: Update copyright. * gdbtypes.h, gnu-v2-abi.c, inferior.h, inftarg.c: Update copyright. * language.c, language.h, m32r-tdep.c: Update copyright. * mn10200-tdep.c, scm-lang.c, scm-lang.h: Update copyright. * somsolib.c, somsolib.h, symfile.c, symtab.h: Update copyright. * thread-db.c, typeprint.c, utils.c, valarith.c: Update copyright. * values.c, win32-nat.c, x86-64-linux-nat.c: Update copyright. * x86-64-linux-tdep.c, z8k-tdep.c: Update copyright. * cli/cli-decode.h, config/h8500/tm-h8500.h: Update copyright. Index: mi/ChangeLog 2003-01-13 Andrew Cagney <ac131313@redhat.com> * mi-cmd-env.c: Update copyright.
211 lines
5.5 KiB
C
211 lines
5.5 KiB
C
/* Target-dependent code for GNU/Linux running on x86-64, for GDB.
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Copyright 2001, 2003 Free Software Foundation, Inc.
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Contributed by Jiri Smid, SuSE Labs.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "inferior.h"
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#include "gdbcore.h"
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#include "gdb_string.h"
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#include "regcache.h"
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#include "x86-64-tdep.h"
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#include "dwarf2cfi.h"
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#include "osabi.h"
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#define LINUX_SIGTRAMP_INSN0 (0x48) /* mov $NNNNNNNN,%rax */
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#define LINUX_SIGTRAMP_OFFSET0 (0)
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#define LINUX_SIGTRAMP_INSN1 (0x0f) /* syscall */
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#define LINUX_SIGTRAMP_OFFSET1 (7)
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static const unsigned char linux_sigtramp_code[] = {
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/* mov $__NR_rt_sigreturn,%rax */
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LINUX_SIGTRAMP_INSN0, 0xc7, 0xc0, 0x0f, 0x00, 0x00, 0x00,
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/* syscall */
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LINUX_SIGTRAMP_INSN1, 0x05
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};
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#define LINUX_SIGTRAMP_LEN (sizeof linux_sigtramp_code)
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/* If PC is in a sigtramp routine, return the address of the start of
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the routine. Otherwise, return 0. */
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static CORE_ADDR
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x86_64_linux_sigtramp_start (CORE_ADDR pc)
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{
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unsigned char buf[LINUX_SIGTRAMP_LEN];
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if (read_memory_nobpt (pc, (char *) buf, LINUX_SIGTRAMP_LEN) != 0)
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return 0;
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if (buf[0] != LINUX_SIGTRAMP_INSN0)
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{
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if (buf[0] != LINUX_SIGTRAMP_INSN1)
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return 0;
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pc -= LINUX_SIGTRAMP_OFFSET1;
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if (read_memory_nobpt (pc, (char *) buf, LINUX_SIGTRAMP_LEN) != 0)
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return 0;
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}
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if (memcmp (buf, linux_sigtramp_code, LINUX_SIGTRAMP_LEN) != 0)
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return 0;
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return pc;
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}
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#define LINUX_SIGINFO_SIZE 0
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/* Offset to struct sigcontext in ucontext, from <asm/ucontext.h>. */
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#define LINUX_UCONTEXT_SIGCONTEXT_OFFSET 40
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/* Offset to saved PC in sigcontext, from <asm/sigcontext.h>. */
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#define LINUX_SIGCONTEXT_PC_OFFSET 128
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#define LINUX_SIGCONTEXT_FP_OFFSET 120
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/* Assuming FRAME is for a GNU/Linux sigtramp routine, return the
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address of the associated sigcontext structure. */
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static CORE_ADDR
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x86_64_linux_sigcontext_addr (struct frame_info *frame)
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{
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CORE_ADDR pc;
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ULONGEST rsp;
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pc = x86_64_linux_sigtramp_start (get_frame_pc (frame));
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if (pc)
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{
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if (get_next_frame (frame))
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/* If this isn't the top frame, the next frame must be for the
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signal handler itself. The sigcontext structure is part of
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the user context. */
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return get_frame_base (get_next_frame (frame)) + LINUX_SIGINFO_SIZE +
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LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
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/* This is the top frame. */
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rsp = read_register (SP_REGNUM);
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return rsp + LINUX_SIGINFO_SIZE + LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
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}
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error ("Couldn't recognize signal trampoline.");
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return 0;
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}
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/* Assuming FRAME is for a GNU/Linux sigtramp routine, return the
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saved program counter. */
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static CORE_ADDR
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x86_64_linux_sigtramp_saved_pc (struct frame_info *frame)
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{
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CORE_ADDR addr;
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addr = x86_64_linux_sigcontext_addr (frame);
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return read_memory_integer (addr + LINUX_SIGCONTEXT_PC_OFFSET, 8);
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}
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/* Immediately after a function call, return the saved pc. */
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CORE_ADDR
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x86_64_linux_saved_pc_after_call (struct frame_info *frame)
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{
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if ((get_frame_type (frame) == SIGTRAMP_FRAME))
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return x86_64_linux_sigtramp_saved_pc (frame);
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return read_memory_integer (read_register (SP_REGNUM), 8);
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}
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/* Saved Pc. Get it from sigcontext if within sigtramp. */
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CORE_ADDR
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x86_64_linux_frame_saved_pc (struct frame_info *frame)
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{
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if ((get_frame_type (frame) == SIGTRAMP_FRAME))
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return x86_64_linux_sigtramp_saved_pc (frame);
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return cfi_get_ra (frame);
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}
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/* Return whether PC is in a GNU/Linux sigtramp routine. */
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int
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x86_64_linux_in_sigtramp (CORE_ADDR pc, char *name)
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{
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if (name)
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return strcmp ("__restore_rt", name) == 0;
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return (x86_64_linux_sigtramp_start (pc) != 0);
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}
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CORE_ADDR
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x86_64_linux_frame_chain (struct frame_info *fi)
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{
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ULONGEST addr;
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CORE_ADDR fp, pc;
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if (!(get_frame_type (fi) == SIGTRAMP_FRAME))
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{
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fp = cfi_frame_chain (fi);
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if (fp)
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return fp;
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else
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addr = get_frame_base (fi);
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}
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else
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addr = get_frame_base (get_next_frame (fi));
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addr += LINUX_SIGINFO_SIZE + LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
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fp = read_memory_integer (addr + LINUX_SIGCONTEXT_FP_OFFSET, 8) + 8;
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return fp;
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}
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CORE_ADDR
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x86_64_init_frame_pc (int fromleaf, struct frame_info *fi)
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{
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CORE_ADDR addr;
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if (get_next_frame (fi)
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&& (get_frame_type (get_next_frame (fi)) == SIGTRAMP_FRAME))
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{
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addr = get_frame_base (get_next_frame (get_next_frame (fi)))
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+ LINUX_SIGINFO_SIZE + LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
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return read_memory_integer (addr + LINUX_SIGCONTEXT_PC_OFFSET, 8);
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}
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else
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return cfi_init_frame_pc (fromleaf, fi);
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}
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static void
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x86_64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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x86_64_init_abi (info, gdbarch);
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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extern void _initialize_x86_64_linux_tdep (void);
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void
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_initialize_x86_64_linux_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, GDB_OSABI_LINUX,
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x86_64_linux_init_abi);
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}
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