1/* GNU/Linux/x86-64 specific low level interface, for the remote server
2   for GDB.
3   Copyright 2002, 2004
4   Free Software Foundation, Inc.
5
6   This file is part of GDB.
7
8   This program is free software; you can redistribute it and/or modify
9   it under the terms of the GNU General Public License as published by
10   the Free Software Foundation; either version 2 of the License, or
11   (at your option) any later version.
12
13   This program is distributed in the hope that it will be useful,
14   but WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16   GNU General Public License for more details.
17
18   You should have received a copy of the GNU General Public License
19   along with this program; if not, write to the Free Software
20   Foundation, Inc., 59 Temple Place - Suite 330,
21   Boston, MA 02111-1307, USA.  */
22
23#include "server.h"
24#include "linux-low.h"
25#include "i387-fp.h"
26
27/* Correct for all GNU/Linux targets (for quite some time).  */
28#define GDB_GREGSET_T elf_gregset_t
29#define GDB_FPREGSET_T elf_fpregset_t
30
31#ifndef HAVE_ELF_FPREGSET_T
32/* Make sure we have said types.  Not all platforms bring in <linux/elf.h>
33   via <sys/procfs.h>.  */
34#ifdef HAVE_LINUX_ELF_H
35#include <linux/elf.h>
36#endif
37#endif
38
39#include "../gdb_proc_service.h"
40
41#include <sys/reg.h>
42#include <sys/procfs.h>
43#include <sys/ptrace.h>
44
45/* This definition comes from prctl.h, but some kernels may not have it.  */
46#ifndef PTRACE_ARCH_PRCTL
47#define PTRACE_ARCH_PRCTL      30
48#endif
49
50/* The following definitions come from prctl.h, but may be absent
51   for certain configurations.  */
52#ifndef ARCH_GET_FS
53#define ARCH_SET_GS 0x1001
54#define ARCH_SET_FS 0x1002
55#define ARCH_GET_FS 0x1003
56#define ARCH_GET_GS 0x1004
57#endif
58
59static int x86_64_regmap[] = {
60  RAX * 8, RBX * 8, RCX * 8, RDX * 8,
61  RSI * 8, RDI * 8, RBP * 8, RSP * 8,
62  R8 * 8, R9 * 8, R10 * 8, R11 * 8,
63  R12 * 8, R13 * 8, R14 * 8, R15 * 8,
64  RIP * 8, EFLAGS * 8, CS * 8, SS * 8,
65  DS * 8, ES * 8, FS * 8, GS * 8
66};
67
68#define X86_64_NUM_GREGS (sizeof(x86_64_regmap)/sizeof(int))
69
70/* Called by libthread_db.  */
71
72ps_err_e
73ps_get_thread_area (const struct ps_prochandle *ph,
74                    lwpid_t lwpid, int idx, void **base)
75{
76  switch (idx)
77    {
78    case FS:
79      if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0)
80	return PS_OK;
81      break;
82    case GS:
83      if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0)
84	return PS_OK;
85      break;
86    default:
87      return PS_BADADDR;
88    }
89  return PS_ERR;
90}
91
92static void
93x86_64_fill_gregset (void *buf)
94{
95  int i;
96
97  for (i = 0; i < X86_64_NUM_GREGS; i++)
98    collect_register (i, ((char *) buf) + x86_64_regmap[i]);
99}
100
101static void
102x86_64_store_gregset (const void *buf)
103{
104  int i;
105
106  for (i = 0; i < X86_64_NUM_GREGS; i++)
107    supply_register (i, ((char *) buf) + x86_64_regmap[i]);
108}
109
110static void
111x86_64_fill_fpregset (void *buf)
112{
113  i387_cache_to_fxsave (buf);
114}
115
116static void
117x86_64_store_fpregset (const void *buf)
118{
119  i387_fxsave_to_cache (buf);
120}
121
122struct regset_info target_regsets[] = {
123  { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t),
124    GENERAL_REGS,
125    x86_64_fill_gregset, x86_64_store_gregset },
126  { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t),
127    FP_REGS,
128    x86_64_fill_fpregset, x86_64_store_fpregset },
129  { 0, 0, -1, -1, NULL, NULL }
130};
131
132struct linux_target_ops the_low_target = {
133  -1,
134  NULL,
135  NULL,
136  NULL,
137};
138