1 /* Native-dependent code for AMD64. 2 3 Copyright (C) 2003-2013 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 #include "amd64-nat.h" 30 31 /* The following bits of code help with implementing debugging 32-bit 32 code natively on AMD64. The idea is to define two mappings between 33 the register number as used by GDB and the register set used by the 34 host to represent the general-purpose registers; one for 32-bit 35 code and one for 64-bit code. The mappings are specified by the 36 follwing variables and consist of an array of offsets within the 37 register set indexed by register number, and the number of 38 registers supported by the mapping. We don't need mappings for the 39 floating-point and SSE registers, since the difference between 40 64-bit and 32-bit variants are negligable. The difference in the 41 number of SSE registers is already handled by the target code. */ 42 43 /* General-purpose register mapping for native 32-bit code. */ 44 int *amd64_native_gregset32_reg_offset; 45 int amd64_native_gregset32_num_regs = I386_NUM_GREGS; 46 47 /* General-purpose register mapping for native 64-bit code. */ 48 int *amd64_native_gregset64_reg_offset; 49 int amd64_native_gregset64_num_regs = AMD64_NUM_GREGS; 50 51 /* Return the offset of REGNUM within the appropriate native 52 general-purpose register set. */ 53 54 static int 55 amd64_native_gregset_reg_offset (struct gdbarch *gdbarch, int regnum) 56 { 57 int *reg_offset = amd64_native_gregset64_reg_offset; 58 int num_regs = amd64_native_gregset64_num_regs; 59 60 gdb_assert (regnum >= 0); 61 62 if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) 63 { 64 reg_offset = amd64_native_gregset32_reg_offset; 65 num_regs = amd64_native_gregset32_num_regs; 66 } 67 68 if (num_regs > gdbarch_num_regs (gdbarch)) 69 num_regs = gdbarch_num_regs (gdbarch); 70 71 if (regnum < num_regs && regnum < gdbarch_num_regs (gdbarch)) 72 return reg_offset[regnum]; 73 74 return -1; 75 } 76 77 /* Return whether the native general-purpose register set supplies 78 register REGNUM. */ 79 80 int 81 amd64_native_gregset_supplies_p (struct gdbarch *gdbarch, int regnum) 82 { 83 return (amd64_native_gregset_reg_offset (gdbarch, regnum) != -1); 84 } 85 86 87 /* Supply register REGNUM, whose contents are stored in GREGS, to 88 REGCACHE. If REGNUM is -1, supply all appropriate registers. */ 89 90 void 91 amd64_supply_native_gregset (struct regcache *regcache, 92 const void *gregs, int regnum) 93 { 94 const char *regs = gregs; 95 struct gdbarch *gdbarch = get_regcache_arch (regcache); 96 int num_regs = amd64_native_gregset64_num_regs; 97 int i; 98 99 if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) 100 num_regs = amd64_native_gregset32_num_regs; 101 102 if (num_regs > gdbarch_num_regs (gdbarch)) 103 num_regs = gdbarch_num_regs (gdbarch); 104 105 for (i = 0; i < num_regs; i++) 106 { 107 if (regnum == -1 || regnum == i) 108 { 109 int offset = amd64_native_gregset_reg_offset (gdbarch, i); 110 111 if (offset != -1) 112 regcache_raw_supply (regcache, i, regs + offset); 113 } 114 } 115 } 116 117 /* Collect register REGNUM from REGCACHE and store its contents in 118 GREGS. If REGNUM is -1, collect and store all appropriate 119 registers. */ 120 121 void 122 amd64_collect_native_gregset (const struct regcache *regcache, 123 void *gregs, int regnum) 124 { 125 char *regs = gregs; 126 struct gdbarch *gdbarch = get_regcache_arch (regcache); 127 int num_regs = amd64_native_gregset64_num_regs; 128 int i; 129 130 if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) 131 { 132 num_regs = amd64_native_gregset32_num_regs; 133 134 /* Make sure %eax, %ebx, %ecx, %edx, %esi, %edi, %ebp, %esp and 135 %eip get zero-extended to 64 bits. */ 136 for (i = 0; i <= I386_EIP_REGNUM; i++) 137 { 138 if (regnum == -1 || regnum == i) 139 memset (regs + amd64_native_gregset_reg_offset (gdbarch, i), 0, 8); 140 } 141 /* Ditto for %cs, %ss, %ds, %es, %fs, and %gs. */ 142 for (i = I386_CS_REGNUM; i <= I386_GS_REGNUM; i++) 143 { 144 if (regnum == -1 || regnum == i) 145 memset (regs + amd64_native_gregset_reg_offset (gdbarch, i), 0, 8); 146 } 147 } 148 149 if (num_regs > gdbarch_num_regs (gdbarch)) 150 num_regs = gdbarch_num_regs (gdbarch); 151 152 for (i = 0; i < num_regs; i++) 153 { 154 if (regnum == -1 || regnum == i) 155 { 156 int offset = amd64_native_gregset_reg_offset (gdbarch, i); 157 158 if (offset != -1) 159 regcache_raw_collect (regcache, i, regs + offset); 160 } 161 } 162 } 163