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/* GNU/Linux/x86-64 specific low level interface, for the remote server

   for GDB.

   Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008

   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 3 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, see <http://www.gnu.org/licenses/>.  */

#include "server.h"

#include "linux-low.h"

#include "i387-fp.h"

#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,

  -1, -1, -1, -1, -1, -1, -1, -1,

  -1, -1, -1, -1, -1, -1, -1, -1,

  -1, -1, -1, -1, -1, -1, -1, -1,

  -1, -1, -1, -1, -1, -1, -1, -1, -1,

  ORIG_RAX * 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++)

    if (x86_64_regmap[i] != -1)

      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++)

    if (x86_64_regmap[i] != -1)

      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,

  NULL,

  NULL,

  NULL,

  NULL,

  0,

  "i386:x86-64",

};