gdb/gdbserver/linux-x86-64-low.c

   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 static int x86_64_regmap[] = {
  51   RAX * 8, RBX * 8, RCX * 8, RDX * 8,
  52   RSI * 8, RDI * 8, RBP * 8, RSP * 8,
  53   R8 * 8, R9 * 8, R10 * 8, R11 * 8,
  54   R12 * 8, R13 * 8, R14 * 8, R15 * 8,
  55   RIP * 8, EFLAGS * 8, CS * 8, SS * 8,
  56   DS * 8, ES * 8, FS * 8, GS * 8
  57 };
  58
  59 #define X86_64_NUM_GREGS (sizeof(x86_64_regmap)/sizeof(int))
  60
  61 /* Called by libthread_db.  */
  62
  63 ps_err_e
  64 ps_get_thread_area (const struct ps_prochandle *ph,
  65                     lwpid_t lwpid, int idx, void **base)
  66 {
  67   switch (idx)
  68     {
  69     case FS:
  70       if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0)
  71         return PS_OK;
  72       break;
  73     case GS:
  74       if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0)
  75         return PS_OK;
  76       break;
  77     default:
  78       return PS_BADADDR;
  79     }
  80   return PS_ERR;
  81 }
  82
  83 static void
  84 x86_64_fill_gregset (void *buf)
  85 {
  86   int i;
  87
  88   for (i = 0; i < X86_64_NUM_GREGS; i++)
  89     collect_register (i, ((char *) buf) + x86_64_regmap[i]);
  90 }
  91
  92 static void
  93 x86_64_store_gregset (const void *buf)
  94 {
  95   int i;
  96
  97   for (i = 0; i < X86_64_NUM_GREGS; i++)
  98     supply_register (i, ((char *) buf) + x86_64_regmap[i]);
  99 }
 100
 101 static void
 102 x86_64_fill_fpregset (void *buf)
 103 {
 104   i387_cache_to_fxsave (buf);
 105 }
 106
 107 static void
 108 x86_64_store_fpregset (const void *buf)
 109 {
 110   i387_fxsave_to_cache (buf);
 111 }
 112
 113 struct regset_info target_regsets[] = {
 114   { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t),
 115     GENERAL_REGS,
 116     x86_64_fill_gregset, x86_64_store_gregset },
 117   { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t),
 118     FP_REGS,
 119     x86_64_fill_fpregset, x86_64_store_fpregset },
 120   { 0, 0, -1, -1, NULL, NULL }
 121 };
 122
 123 struct linux_target_ops the_low_target = {
 124   -1,
 125   NULL,
 126   NULL,
 127   NULL,
 128 };