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138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/* Target-dependent code for GNU/Linux running on x86-64, for GDB.
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Copyright 2001 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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#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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LINUX_SIGTRAMP_INSN0, 0xc7, 0xc0, 0x89, 0x00, 0x00, 0x00, /* mov $0x89,%rax */
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LINUX_SIGTRAMP_INSN1, 0x05 /* syscall */
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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 128
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/* Offset to struct sigcontext in ucontext, from <asm/ucontext.h>. */
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#define LINUX_UCONTEXT_SIGCONTEXT_OFFSET (36)
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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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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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pc = x86_64_linux_sigtramp_start (frame->pc);
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if (pc)
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{
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if (frame->next)
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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 frame->next->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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return read_register (SP_REGNUM) + LINUX_SIGINFO_SIZE +
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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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/* Offset to saved PC in sigcontext, from <asm/sigcontext.h>. */
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#define LINUX_SIGCONTEXT_PC_OFFSET (136)
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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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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 (frame->signal_handler_caller)
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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 (frame->signal_handler_caller)
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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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