1/* Native-dependent code for AMD64. 2 3 Copyright (C) 2003, 2004, 2007 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 3 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, see <http://www.gnu.org/licenses/>. */ 19 20#include "defs.h" 21#include "gdbarch.h" 22#include "regcache.h" 23 24#include "gdb_assert.h" 25#include "gdb_string.h" 26 27#include "i386-tdep.h" 28#include "amd64-tdep.h" 29 30/* The following bits of code help with implementing debugging 32-bit 31 code natively on AMD64. The idea is to define two mappings between 32 the register number as used by GDB and the register set used by the 33 host to represent the general-purpose registers; one for 32-bit 34 code and one for 64-bit code. The mappings are specified by the 35 follwing variables and consist of an array of offsets within the 36 register set indexed by register number, and the number of 37 registers supported by the mapping. We don't need mappings for the 38 floating-point and SSE registers, since the difference between 39 64-bit and 32-bit variants are negligable. The difference in the 40 number of SSE registers is already handled by the target code. */ 41 42/* General-purpose register mapping for native 32-bit code. */ 43int *amd64_native_gregset32_reg_offset; 44int amd64_native_gregset32_num_regs = I386_NUM_GREGS; 45 46/* General-purpose register mapping for native 64-bit code. */ 47int *amd64_native_gregset64_reg_offset; 48int amd64_native_gregset64_num_regs = AMD64_NUM_GREGS; 49 50/* Return the offset of REGNUM within the appropriate native 51 general-purpose register set. */ 52 53static int 54amd64_native_gregset_reg_offset (int regnum) 55{ 56 int *reg_offset = amd64_native_gregset64_reg_offset; 57 int num_regs = amd64_native_gregset64_num_regs; 58 59 gdb_assert (regnum >= 0); 60 61 if (gdbarch_ptr_bit (current_gdbarch) == 32) 62 { 63 reg_offset = amd64_native_gregset32_reg_offset; 64 num_regs = amd64_native_gregset32_num_regs; 65 } 66 67 if (num_regs > gdbarch_num_regs (current_gdbarch)) 68 num_regs = gdbarch_num_regs (current_gdbarch); 69 70 if (regnum < num_regs && regnum < gdbarch_num_regs (current_gdbarch)) 71 return reg_offset[regnum]; 72 73 return -1; 74} 75 76/* Return whether the native general-purpose register set supplies 77 register REGNUM. */ 78 79int 80amd64_native_gregset_supplies_p (int regnum) 81{ 82 return (amd64_native_gregset_reg_offset (regnum) != -1); 83} 84 85 86/* Supply register REGNUM, whose contents are stored in GREGS, to 87 REGCACHE. If REGNUM is -1, supply all appropriate registers. */ 88 89void 90amd64_supply_native_gregset (struct regcache *regcache, 91 const void *gregs, int regnum) 92{ 93 const char *regs = gregs; 94 struct gdbarch *gdbarch = get_regcache_arch (regcache); 95 int num_regs = amd64_native_gregset64_num_regs; 96 int i; 97 98 if (gdbarch_ptr_bit (gdbarch) == 32) 99 num_regs = amd64_native_gregset32_num_regs; 100 101 if (num_regs > gdbarch_num_regs (current_gdbarch)) 102 num_regs = gdbarch_num_regs (current_gdbarch); 103 104 for (i = 0; i < num_regs; i++) 105 { 106 if (regnum == -1 || regnum == i) 107 { 108 int offset = amd64_native_gregset_reg_offset (i); 109 110 if (offset != -1) 111 regcache_raw_supply (regcache, i, regs + offset); 112 } 113 } 114} 115 116/* Collect register REGNUM from REGCACHE and store its contents in 117 GREGS. If REGNUM is -1, collect and store all appropriate 118 registers. */ 119 120void 121amd64_collect_native_gregset (const struct regcache *regcache, 122 void *gregs, int regnum) 123{ 124 char *regs = gregs; 125 struct gdbarch *gdbarch = get_regcache_arch (regcache); 126 int num_regs = amd64_native_gregset64_num_regs; 127 int i; 128 129 if (gdbarch_ptr_bit (gdbarch) == 32) 130 { 131 num_regs = amd64_native_gregset32_num_regs; 132 133 /* Make sure %eax, %ebx, %ecx, %edx, %esi, %edi, %ebp, %esp and 134 %eip get zero-extended to 64 bits. */ 135 for (i = 0; i <= I386_EIP_REGNUM; i++) 136 { 137 if (regnum == -1 || regnum == i) 138 memset (regs + amd64_native_gregset_reg_offset (i), 0, 8); 139 } 140 /* Ditto for %cs, %ss, %ds, %es, %fs, and %gs. */ 141 for (i = I386_CS_REGNUM; i <= I386_GS_REGNUM; i++) 142 { 143 if (regnum == -1 || regnum == i) 144 memset (regs + amd64_native_gregset_reg_offset (i), 0, 8); 145 } 146 } 147 148 if (num_regs > gdbarch_num_regs (current_gdbarch)) 149 num_regs = gdbarch_num_regs (current_gdbarch); 150 151 for (i = 0; i < num_regs; i++) 152 { 153 if (regnum == -1 || regnum == i) 154 { 155 int offset = amd64_native_gregset_reg_offset (i); 156 157 if (offset != -1) 158 regcache_raw_collect (regcache, i, regs + offset); 159 } 160 } 161} 162