fbsd-i386-low.c revision 157572
1/* GNU/Linux/i386 specific low level interface, for the remote server for GDB. 2 Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002 3 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 59 Temple Place - Suite 330, 20 Boston, MA 02111-1307, USA. */ 21 22#include "server.h" 23#include "linux-low.h" 24#include "i387-fp.h" 25 26#ifdef HAVE_SYS_REG_H 27#include <sys/reg.h> 28#endif 29 30/* This module only supports access to the general purpose registers. */ 31 32#define i386_num_regs 16 33 34/* This stuff comes from i386-linux-nat.c. */ 35 36/* Mapping between the general-purpose registers in `struct user' 37 format and GDB's register array layout. */ 38static int i386_regmap[] = 39{ 40 EAX * 4, ECX * 4, EDX * 4, EBX * 4, 41 UESP * 4, EBP * 4, ESI * 4, EDI * 4, 42 EIP * 4, EFL * 4, CS * 4, SS * 4, 43 DS * 4, ES * 4, FS * 4, GS * 4 44}; 45 46static int 47i386_cannot_store_register (int regno) 48{ 49 return (regno >= i386_num_regs); 50} 51 52static int 53i386_cannot_fetch_register (int regno) 54{ 55 return (regno >= i386_num_regs); 56} 57 58 59#ifdef HAVE_LINUX_REGSETS 60#include <sys/procfs.h> 61#include <sys/ptrace.h> 62 63static void 64i386_fill_gregset (void *buf) 65{ 66 int i; 67 68 for (i = 0; i < i386_num_regs; i++) 69 collect_register (i, ((char *) buf) + i386_regmap[i]); 70 71 collect_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4); 72} 73 74static void 75i386_store_gregset (const void *buf) 76{ 77 int i; 78 79 for (i = 0; i < i386_num_regs; i++) 80 supply_register (i, ((char *) buf) + i386_regmap[i]); 81 82 supply_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4); 83} 84 85static void 86i386_fill_fpregset (void *buf) 87{ 88 i387_cache_to_fsave (buf); 89} 90 91static void 92i386_store_fpregset (const void *buf) 93{ 94 i387_fsave_to_cache (buf); 95} 96 97static void 98i386_fill_fpxregset (void *buf) 99{ 100 i387_cache_to_fxsave (buf); 101} 102 103static void 104i386_store_fpxregset (const void *buf) 105{ 106 i387_fxsave_to_cache (buf); 107} 108 109 110struct regset_info target_regsets[] = { 111 { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t), 112 GENERAL_REGS, 113 i386_fill_gregset, i386_store_gregset }, 114#ifdef HAVE_PTRACE_GETFPXREGS 115 { PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, sizeof (elf_fpxregset_t), 116 EXTENDED_REGS, 117 i386_fill_fpxregset, i386_store_fpxregset }, 118#endif 119 { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t), 120 FP_REGS, 121 i386_fill_fpregset, i386_store_fpregset }, 122 { 0, 0, -1, -1, NULL, NULL } 123}; 124 125#endif /* HAVE_LINUX_REGSETS */ 126 127static const char i386_breakpoint[] = { 0xCC }; 128#define i386_breakpoint_len 1 129 130extern int debug_threads; 131 132static CORE_ADDR 133i386_get_pc () 134{ 135 unsigned long pc; 136 137 collect_register_by_name ("eip", &pc); 138 139 if (debug_threads) 140 fprintf (stderr, "stop pc (before any decrement) is %08lx\n", pc); 141 return pc; 142} 143 144static void 145i386_set_pc (CORE_ADDR newpc) 146{ 147 if (debug_threads) 148 fprintf (stderr, "set pc to %08lx\n", (long) newpc); 149 supply_register_by_name ("eip", &newpc); 150} 151 152static int 153i386_breakpoint_at (CORE_ADDR pc) 154{ 155 unsigned char c; 156 157 read_inferior_memory (pc, &c, 1); 158 if (c == 0xCC) 159 return 1; 160 161 return 0; 162} 163 164struct linux_target_ops the_low_target = { 165 i386_num_regs, 166 i386_regmap, 167 i386_cannot_fetch_register, 168 i386_cannot_store_register, 169 i386_get_pc, 170 i386_set_pc, 171 i386_breakpoint, 172 i386_breakpoint_len, 173 NULL, 174 1, 175 i386_breakpoint_at, 176}; 177