| 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. */ |
| 38 | static 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 | |
| 46 | static int |
| 47 | i386_cannot_store_register (int regno) |
| 48 | { |
| 49 | return (regno >= i386_num_regs); |
| 50 | } |
| 51 | |
| 52 | static int |
| 53 | i386_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 | |
| 63 | static void |
| 64 | i386_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 | |
| 74 | static void |
| 75 | i386_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 | |
| 85 | static void |
| 86 | i386_fill_fpregset (void *buf) |
| 87 | { |
| 88 | i387_cache_to_fsave (buf); |
| 89 | } |
| 90 | |
| 91 | static void |
| 92 | i386_store_fpregset (const void *buf) |
| 93 | { |
| 94 | i387_fsave_to_cache (buf); |
| 95 | } |
| 96 | |
| 97 | static void |
| 98 | i386_fill_fpxregset (void *buf) |
| 99 | { |
| 100 | i387_cache_to_fxsave (buf); |
| 101 | } |
| 102 | |
| 103 | static void |
| 104 | i386_store_fpxregset (const void *buf) |
| 105 | { |
| 106 | i387_fxsave_to_cache (buf); |
| 107 | } |
| 108 | |
| 109 | |
| 110 | struct 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 | |
| 127 | static const char i386_breakpoint[] = { 0xCC }; |
| 128 | #define i386_breakpoint_len 1 |
| 129 | |
| 130 | extern int debug_threads; |
| 131 | |
| 132 | static CORE_ADDR |
| 133 | i386_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 | |
| 144 | static void |
| 145 | i386_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 | |
| 152 | static int |
| 153 | i386_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 | |
| 164 | struct 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 | }; |