1 /* Native-dependent code for AMD64. 2 3 Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010 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 3 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, see <http://www.gnu.org/licenses/>. */ 20 21 #include "defs.h" 22 #include "gdbarch.h" 23 #include "regcache.h" 24 25 #include "gdb_assert.h" 26 #include "gdb_string.h" 27 28 #include "i386-tdep.h" 29 #include "amd64-tdep.h" 30 #include "amd64-nat.h" 31 32 /* The following bits of code help with implementing debugging 32-bit 33 code natively on AMD64. The idea is to define two mappings between 34 the register number as used by GDB and the register set used by the 35 host to represent the general-purpose registers; one for 32-bit 36 code and one for 64-bit code. The mappings are specified by the 37 follwing variables and consist of an array of offsets within the 38 register set indexed by register number, and the number of 39 registers supported by the mapping. We don't need mappings for the 40 floating-point and SSE registers, since the difference between 41 64-bit and 32-bit variants are negligable. The difference in the 42 number of SSE registers is already handled by the target code. */ 43 44 /* General-purpose register mapping for native 32-bit code. */ 45 int *amd64_native_gregset32_reg_offset; 46 int amd64_native_gregset32_num_regs = I386_NUM_GREGS; 47 48 /* General-purpose register mapping for native 64-bit code. */ 49 int *amd64_native_gregset64_reg_offset; 50 int amd64_native_gregset64_num_regs = AMD64_NUM_GREGS; 51 52 /* Return the offset of REGNUM within the appropriate native 53 general-purpose register set. */ 54 55 static int 56 amd64_native_gregset_reg_offset (struct gdbarch *gdbarch, int regnum) 57 { 58 int *reg_offset = amd64_native_gregset64_reg_offset; 59 int num_regs = amd64_native_gregset64_num_regs; 60 61 gdb_assert (regnum >= 0); 62 63 if (gdbarch_ptr_bit (gdbarch) == 32) 64 { 65 reg_offset = amd64_native_gregset32_reg_offset; 66 num_regs = amd64_native_gregset32_num_regs; 67 } 68 69 if (num_regs > gdbarch_num_regs (gdbarch)) 70 num_regs = gdbarch_num_regs (gdbarch); 71 72 if (regnum < num_regs && regnum < gdbarch_num_regs (gdbarch)) 73 return reg_offset[regnum]; 74 75 return -1; 76 } 77 78 /* Return whether the native general-purpose register set supplies 79 register REGNUM. */ 80 81 int 82 amd64_native_gregset_supplies_p (struct gdbarch *gdbarch, int regnum) 83 { 84 return (amd64_native_gregset_reg_offset (gdbarch, regnum) != -1); 85 } 86 87 88 /* Supply register REGNUM, whose contents are stored in GREGS, to 89 REGCACHE. If REGNUM is -1, supply all appropriate registers. */ 90 91 void 92 amd64_supply_native_gregset (struct regcache *regcache, 93 const void *gregs, int regnum) 94 { 95 const char *regs = gregs; 96 struct gdbarch *gdbarch = get_regcache_arch (regcache); 97 int num_regs = amd64_native_gregset64_num_regs; 98 int i; 99 100 if (gdbarch_ptr_bit (gdbarch) == 32) 101 num_regs = amd64_native_gregset32_num_regs; 102 103 if (num_regs > gdbarch_num_regs (gdbarch)) 104 num_regs = gdbarch_num_regs (gdbarch); 105 106 for (i = 0; i < num_regs; i++) 107 { 108 if (regnum == -1 || regnum == i) 109 { 110 int offset = amd64_native_gregset_reg_offset (gdbarch, i); 111 112 if (offset != -1) 113 regcache_raw_supply (regcache, i, regs + offset); 114 } 115 } 116 } 117 118 /* Collect register REGNUM from REGCACHE and store its contents in 119 GREGS. If REGNUM is -1, collect and store all appropriate 120 registers. */ 121 122 void 123 amd64_collect_native_gregset (const struct regcache *regcache, 124 void *gregs, int regnum) 125 { 126 char *regs = gregs; 127 struct gdbarch *gdbarch = get_regcache_arch (regcache); 128 int num_regs = amd64_native_gregset64_num_regs; 129 int i; 130 131 if (gdbarch_ptr_bit (gdbarch) == 32) 132 { 133 num_regs = amd64_native_gregset32_num_regs; 134 135 /* Make sure %eax, %ebx, %ecx, %edx, %esi, %edi, %ebp, %esp and 136 %eip get zero-extended to 64 bits. */ 137 for (i = 0; i <= I386_EIP_REGNUM; i++) 138 { 139 if (regnum == -1 || regnum == i) 140 memset (regs + amd64_native_gregset_reg_offset (gdbarch, i), 0, 8); 141 } 142 /* Ditto for %cs, %ss, %ds, %es, %fs, and %gs. */ 143 for (i = I386_CS_REGNUM; i <= I386_GS_REGNUM; i++) 144 { 145 if (regnum == -1 || regnum == i) 146 memset (regs + amd64_native_gregset_reg_offset (gdbarch, i), 0, 8); 147 } 148 } 149 150 if (num_regs > gdbarch_num_regs (gdbarch)) 151 num_regs = gdbarch_num_regs (gdbarch); 152 153 for (i = 0; i < num_regs; i++) 154 { 155 if (regnum == -1 || regnum == i) 156 { 157 int offset = amd64_native_gregset_reg_offset (gdbarch, i); 158 159 if (offset != -1) 160 regcache_raw_collect (regcache, i, regs + offset); 161 } 162 } 163 } 164