URL
https://opencores.org/ocsvn/or1k/or1k/trunk
Subversion Repositories or1k
[/] [or1k/] [tags/] [VER_5_3/] [gdb-5.3/] [gdb/] [x86-64-linux-tdep.c] - Rev 1782
Go to most recent revision | Compare with Previous | Blame | View Log
/* Target-dependent code for GNU/Linux running on x86-64, for GDB. Copyright 2001 Free Software Foundation, Inc. Contributed by Jiri Smid, SuSE Labs. 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 "inferior.h" #include "gdbcore.h" #include "gdb_string.h" #include "regcache.h" #include "x86-64-tdep.h" #include "dwarf2cfi.h" #define LINUX_SIGTRAMP_INSN0 (0x48) /* mov $NNNNNNNN,%rax */ #define LINUX_SIGTRAMP_OFFSET0 (0) #define LINUX_SIGTRAMP_INSN1 (0x0f) /* syscall */ #define LINUX_SIGTRAMP_OFFSET1 (7) static const unsigned char linux_sigtramp_code[] = { LINUX_SIGTRAMP_INSN0, 0xc7, 0xc0, 0x89, 0x00, 0x00, 0x00, /* mov $0x89,%rax */ LINUX_SIGTRAMP_INSN1, 0x05 /* syscall */ }; #define LINUX_SIGTRAMP_LEN (sizeof linux_sigtramp_code) /* If PC is in a sigtramp routine, return the address of the start of the routine. Otherwise, return 0. */ static CORE_ADDR x86_64_linux_sigtramp_start (CORE_ADDR pc) { unsigned char buf[LINUX_SIGTRAMP_LEN]; if (read_memory_nobpt (pc, (char *) buf, LINUX_SIGTRAMP_LEN) != 0) return 0; if (buf[0] != LINUX_SIGTRAMP_INSN0) { if (buf[0] != LINUX_SIGTRAMP_INSN1) return 0; pc -= LINUX_SIGTRAMP_OFFSET1; if (read_memory_nobpt (pc, (char *) buf, LINUX_SIGTRAMP_LEN) != 0) return 0; } if (memcmp (buf, linux_sigtramp_code, LINUX_SIGTRAMP_LEN) != 0) return 0; return pc; } #define LINUX_SIGINFO_SIZE 128 /* Offset to struct sigcontext in ucontext, from <asm/ucontext.h>. */ #define LINUX_UCONTEXT_SIGCONTEXT_OFFSET (36) /* Assuming FRAME is for a GNU/Linux sigtramp routine, return the address of the associated sigcontext structure. */ CORE_ADDR x86_64_linux_sigcontext_addr (struct frame_info *frame) { CORE_ADDR pc; pc = x86_64_linux_sigtramp_start (frame->pc); if (pc) { if (frame->next) /* If this isn't the top frame, the next frame must be for the signal handler itself. The sigcontext structure is part of the user context. */ return frame->next->frame + LINUX_SIGINFO_SIZE + LINUX_UCONTEXT_SIGCONTEXT_OFFSET; /* This is the top frame. */ return read_register (SP_REGNUM) + LINUX_SIGINFO_SIZE + LINUX_UCONTEXT_SIGCONTEXT_OFFSET; } error ("Couldn't recognize signal trampoline."); return 0; } /* Offset to saved PC in sigcontext, from <asm/sigcontext.h>. */ #define LINUX_SIGCONTEXT_PC_OFFSET (136) /* Assuming FRAME is for a GNU/Linux sigtramp routine, return the saved program counter. */ CORE_ADDR x86_64_linux_sigtramp_saved_pc (struct frame_info *frame) { CORE_ADDR addr; addr = x86_64_linux_sigcontext_addr (frame); return read_memory_integer (addr + LINUX_SIGCONTEXT_PC_OFFSET, 8); } /* Immediately after a function call, return the saved pc. */ CORE_ADDR x86_64_linux_saved_pc_after_call (struct frame_info *frame) { if (frame->signal_handler_caller) return x86_64_linux_sigtramp_saved_pc (frame); return read_memory_integer (read_register (SP_REGNUM), 8); } /* Saved Pc. Get it from sigcontext if within sigtramp. */ CORE_ADDR x86_64_linux_frame_saved_pc (struct frame_info *frame) { if (frame->signal_handler_caller) return x86_64_linux_sigtramp_saved_pc (frame); return cfi_get_ra (frame); }
Go to most recent revision | Compare with Previous | Blame | View Log