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/* GNU/Linux/x86-64 specific low level interface, for the remote server
for GDB.
Copyright 2002, 2004, 2005
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 "server.h"
#include "linux-low.h"
#include "i387-fp.h"
/* Correct for all GNU/Linux targets (for quite some time). */
#define GDB_GREGSET_T elf_gregset_t
#define GDB_FPREGSET_T elf_fpregset_t
#ifndef HAVE_ELF_FPREGSET_T
/* Make sure we have said types. Not all platforms bring in <linux/elf.h>
via <sys/procfs.h>. */
#ifdef HAVE_LINUX_ELF_H
#include <linux/elf.h>
#endif
#endif
#include "../gdb_proc_service.h"
#include <sys/reg.h>
#include <sys/procfs.h>
#include <sys/ptrace.h>
/* This definition comes from prctl.h, but some kernels may not have it. */
#ifndef PTRACE_ARCH_PRCTL
#define PTRACE_ARCH_PRCTL 30
#endif
/* The following definitions come from prctl.h, but may be absent
for certain configurations. */
#ifndef ARCH_GET_FS
#define ARCH_SET_GS 0x1001
#define ARCH_SET_FS 0x1002
#define ARCH_GET_FS 0x1003
#define ARCH_GET_GS 0x1004
#endif
static int x86_64_regmap[] = {
RAX * 8, RBX * 8, RCX * 8, RDX * 8,
RSI * 8, RDI * 8, RBP * 8, RSP * 8,
R8 * 8, R9 * 8, R10 * 8, R11 * 8,
R12 * 8, R13 * 8, R14 * 8, R15 * 8,
RIP * 8, EFLAGS * 8, CS * 8, SS * 8,
DS * 8, ES * 8, FS * 8, GS * 8
};
#define X86_64_NUM_GREGS (sizeof(x86_64_regmap)/sizeof(int))
/* Called by libthread_db. */
ps_err_e
ps_get_thread_area (const struct ps_prochandle *ph,
lwpid_t lwpid, int idx, void **base)
{
switch (idx)
{
case FS:
if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0)
return PS_OK;
break;
case GS:
if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0)
return PS_OK;
break;
default:
return PS_BADADDR;
}
return PS_ERR;
}
static void
x86_64_fill_gregset (void *buf)
{
int i;
for (i = 0; i < X86_64_NUM_GREGS; i++)
collect_register (i, ((char *) buf) + x86_64_regmap[i]);
}
static void
x86_64_store_gregset (const void *buf)
{
int i;
for (i = 0; i < X86_64_NUM_GREGS; i++)
supply_register (i, ((char *) buf) + x86_64_regmap[i]);
}
static void
x86_64_fill_fpregset (void *buf)
{
i387_cache_to_fxsave (buf);
}
static void
x86_64_store_fpregset (const void *buf)
{
i387_fxsave_to_cache (buf);
}
struct regset_info target_regsets[] = {
{ PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t),
GENERAL_REGS,
x86_64_fill_gregset, x86_64_store_gregset },
{ PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t),
FP_REGS,
x86_64_fill_fpregset, x86_64_store_fpregset },
{ 0, 0, -1, -1, NULL, NULL }
};
static const unsigned char x86_64_breakpoint[] = { 0xCC };
#define x86_64_breakpoint_len 1
extern int debug_threads;
static CORE_ADDR
x86_64_get_pc ()
{
unsigned long pc;
collect_register_by_name ("rip", &pc);
if (debug_threads)
fprintf (stderr, "stop pc (before any decrement) is %08lx\n", pc);
return pc;
}
static void
x86_64_set_pc (CORE_ADDR newpc)
{
if (debug_threads)
fprintf (stderr, "set pc to %08lx\n", (long) newpc);
supply_register_by_name ("rip", &newpc);
}
static int
x86_64_breakpoint_at (CORE_ADDR pc)
{
unsigned char c;
read_inferior_memory (pc, &c, 1);
if (c == 0xCC)
return 1;
return 0;
}
struct linux_target_ops the_low_target = {
-1,
NULL,
NULL,
NULL,
x86_64_get_pc,
x86_64_set_pc,
x86_64_breakpoint,
x86_64_breakpoint_len,
NULL,
1,
x86_64_breakpoint_at,
};
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