| 1 | /* Copyright (C) 2010-2017 Free Software Foundation, Inc. |
| 2 | |
| 3 | This file is part of GDB. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #include "server.h" |
| 19 | #include "lynx-low.h" |
| 20 | #include <limits.h> |
| 21 | #include <sys/ptrace.h> |
| 22 | #include "x86-xstate.h" |
| 23 | #include "arch/i386.h" |
| 24 | |
| 25 | /* The following two typedefs are defined in a .h file which is not |
| 26 | in the standard include path (/sys/include/family/x86/ucontext.h), |
| 27 | so we just duplicate them here. */ |
| 28 | |
| 29 | /* General register context */ |
| 30 | typedef struct usr_econtext { |
| 31 | |
| 32 | uint32_t uec_fault; |
| 33 | uint32_t uec_es; |
| 34 | uint32_t uec_ds; |
| 35 | uint32_t uec_edi; |
| 36 | uint32_t uec_esi; |
| 37 | uint32_t uec_ebp; |
| 38 | uint32_t uec_temp; |
| 39 | uint32_t uec_ebx; |
| 40 | uint32_t uec_edx; |
| 41 | uint32_t uec_ecx; |
| 42 | uint32_t uec_eax; |
| 43 | uint32_t uec_inum; |
| 44 | uint32_t uec_ecode; |
| 45 | uint32_t uec_eip; |
| 46 | uint32_t uec_cs; |
| 47 | uint32_t uec_eflags; |
| 48 | uint32_t uec_esp; |
| 49 | uint32_t uec_ss; |
| 50 | uint32_t uec_fs; |
| 51 | uint32_t uec_gs; |
| 52 | } usr_econtext_t; |
| 53 | |
| 54 | /* Floating point and SIMD register context */ |
| 55 | typedef struct usr_fcontext { |
| 56 | uint16_t ufc_control; |
| 57 | uint16_t ufc_status; |
| 58 | uint16_t ufc_tag; |
| 59 | uint16_t ufc_opcode; |
| 60 | uint8_t *ufc_inst_off; |
| 61 | uint32_t ufc_inst_sel; |
| 62 | uint8_t *ufc_data_off; |
| 63 | uint32_t ufc_data_sel; |
| 64 | uint32_t usse_mxcsr; |
| 65 | uint32_t usse_mxcsr_mask; |
| 66 | struct ufp387_real { |
| 67 | uint16_t umant4; |
| 68 | uint16_t umant3; |
| 69 | uint16_t umant2; |
| 70 | uint16_t umant1; |
| 71 | uint16_t us_and_e; |
| 72 | uint16_t ureserved_1; |
| 73 | uint16_t ureserved_2; |
| 74 | uint16_t ureserved_3; |
| 75 | } ufc_reg[8]; |
| 76 | struct uxmm_register { |
| 77 | uint16_t uchunk_1; |
| 78 | uint16_t uchunk_2; |
| 79 | uint16_t uchunk_3; |
| 80 | uint16_t uchunk_4; |
| 81 | uint16_t uchunk_5; |
| 82 | uint16_t uchunk_6; |
| 83 | uint16_t uchunk_7; |
| 84 | uint16_t uchunk_8; |
| 85 | } uxmm_reg[8]; |
| 86 | char ureserved[16][14]; |
| 87 | } usr_fcontext_t; |
| 88 | |
| 89 | /* The index of various registers inside the regcache. */ |
| 90 | |
| 91 | enum lynx_i386_gdb_regnum |
| 92 | { |
| 93 | I386_EAX_REGNUM, |
| 94 | I386_ECX_REGNUM, |
| 95 | I386_EDX_REGNUM, |
| 96 | I386_EBX_REGNUM, |
| 97 | I386_ESP_REGNUM, |
| 98 | I386_EBP_REGNUM, |
| 99 | I386_ESI_REGNUM, |
| 100 | I386_EDI_REGNUM, |
| 101 | I386_EIP_REGNUM, |
| 102 | I386_EFLAGS_REGNUM, |
| 103 | I386_CS_REGNUM, |
| 104 | I386_SS_REGNUM, |
| 105 | I386_DS_REGNUM, |
| 106 | I386_ES_REGNUM, |
| 107 | I386_FS_REGNUM, |
| 108 | I386_GS_REGNUM, |
| 109 | I386_ST0_REGNUM, |
| 110 | I386_FCTRL_REGNUM = I386_ST0_REGNUM + 8, |
| 111 | I386_FSTAT_REGNUM, |
| 112 | I386_FTAG_REGNUM, |
| 113 | I386_FISEG_REGNUM, |
| 114 | I386_FIOFF_REGNUM, |
| 115 | I386_FOSEG_REGNUM, |
| 116 | I386_FOOFF_REGNUM, |
| 117 | I386_FOP_REGNUM, |
| 118 | I386_XMM0_REGNUM = 32, |
| 119 | I386_MXCSR_REGNUM = I386_XMM0_REGNUM + 8, |
| 120 | I386_SENTINEL_REGUM |
| 121 | }; |
| 122 | |
| 123 | /* The fill_function for the general-purpose register set. */ |
| 124 | |
| 125 | static void |
| 126 | lynx_i386_fill_gregset (struct regcache *regcache, char *buf) |
| 127 | { |
| 128 | #define lynx_i386_collect_gp(regnum, fld) \ |
| 129 | collect_register (regcache, regnum, \ |
| 130 | buf + offsetof (usr_econtext_t, uec_##fld)) |
| 131 | |
| 132 | lynx_i386_collect_gp (I386_EAX_REGNUM, eax); |
| 133 | lynx_i386_collect_gp (I386_ECX_REGNUM, ecx); |
| 134 | lynx_i386_collect_gp (I386_EDX_REGNUM, edx); |
| 135 | lynx_i386_collect_gp (I386_EBX_REGNUM, ebx); |
| 136 | lynx_i386_collect_gp (I386_ESP_REGNUM, esp); |
| 137 | lynx_i386_collect_gp (I386_EBP_REGNUM, ebp); |
| 138 | lynx_i386_collect_gp (I386_ESI_REGNUM, esi); |
| 139 | lynx_i386_collect_gp (I386_EDI_REGNUM, edi); |
| 140 | lynx_i386_collect_gp (I386_EIP_REGNUM, eip); |
| 141 | lynx_i386_collect_gp (I386_EFLAGS_REGNUM, eflags); |
| 142 | lynx_i386_collect_gp (I386_CS_REGNUM, cs); |
| 143 | lynx_i386_collect_gp (I386_SS_REGNUM, ss); |
| 144 | lynx_i386_collect_gp (I386_DS_REGNUM, ds); |
| 145 | lynx_i386_collect_gp (I386_ES_REGNUM, es); |
| 146 | lynx_i386_collect_gp (I386_FS_REGNUM, fs); |
| 147 | lynx_i386_collect_gp (I386_GS_REGNUM, gs); |
| 148 | } |
| 149 | |
| 150 | /* The store_function for the general-purpose register set. */ |
| 151 | |
| 152 | static void |
| 153 | lynx_i386_store_gregset (struct regcache *regcache, const char *buf) |
| 154 | { |
| 155 | #define lynx_i386_supply_gp(regnum, fld) \ |
| 156 | supply_register (regcache, regnum, \ |
| 157 | buf + offsetof (usr_econtext_t, uec_##fld)) |
| 158 | |
| 159 | lynx_i386_supply_gp (I386_EAX_REGNUM, eax); |
| 160 | lynx_i386_supply_gp (I386_ECX_REGNUM, ecx); |
| 161 | lynx_i386_supply_gp (I386_EDX_REGNUM, edx); |
| 162 | lynx_i386_supply_gp (I386_EBX_REGNUM, ebx); |
| 163 | lynx_i386_supply_gp (I386_ESP_REGNUM, esp); |
| 164 | lynx_i386_supply_gp (I386_EBP_REGNUM, ebp); |
| 165 | lynx_i386_supply_gp (I386_ESI_REGNUM, esi); |
| 166 | lynx_i386_supply_gp (I386_EDI_REGNUM, edi); |
| 167 | lynx_i386_supply_gp (I386_EIP_REGNUM, eip); |
| 168 | lynx_i386_supply_gp (I386_EFLAGS_REGNUM, eflags); |
| 169 | lynx_i386_supply_gp (I386_CS_REGNUM, cs); |
| 170 | lynx_i386_supply_gp (I386_SS_REGNUM, ss); |
| 171 | lynx_i386_supply_gp (I386_DS_REGNUM, ds); |
| 172 | lynx_i386_supply_gp (I386_ES_REGNUM, es); |
| 173 | lynx_i386_supply_gp (I386_FS_REGNUM, fs); |
| 174 | lynx_i386_supply_gp (I386_GS_REGNUM, gs); |
| 175 | } |
| 176 | |
| 177 | /* Extract the first 16 bits of register REGNUM in the REGCACHE, |
| 178 | and store these 2 bytes at DEST. |
| 179 | |
| 180 | This is useful to collect certain 16bit registers which are known |
| 181 | by GDBserver as 32bit registers (such as the Control Register |
| 182 | for instance). */ |
| 183 | |
| 184 | static void |
| 185 | collect_16bit_register (struct regcache *regcache, int regnum, char *dest) |
| 186 | { |
| 187 | gdb_byte word[4]; |
| 188 | |
| 189 | collect_register (regcache, regnum, word); |
| 190 | memcpy (dest, word, 2); |
| 191 | } |
| 192 | |
| 193 | /* The fill_function for the floating-point register set. */ |
| 194 | |
| 195 | static void |
| 196 | lynx_i386_fill_fpregset (struct regcache *regcache, char *buf) |
| 197 | { |
| 198 | int i; |
| 199 | |
| 200 | /* Collect %st0 .. %st7. */ |
| 201 | for (i = 0; i < 8; i++) |
| 202 | collect_register (regcache, I386_ST0_REGNUM + i, |
| 203 | buf + offsetof (usr_fcontext_t, ufc_reg) |
| 204 | + i * sizeof (struct ufp387_real)); |
| 205 | |
| 206 | /* Collect the other FPU registers. */ |
| 207 | collect_16bit_register (regcache, I386_FCTRL_REGNUM, |
| 208 | buf + offsetof (usr_fcontext_t, ufc_control)); |
| 209 | collect_16bit_register (regcache, I386_FSTAT_REGNUM, |
| 210 | buf + offsetof (usr_fcontext_t, ufc_status)); |
| 211 | collect_16bit_register (regcache, I386_FTAG_REGNUM, |
| 212 | buf + offsetof (usr_fcontext_t, ufc_tag)); |
| 213 | collect_register (regcache, I386_FISEG_REGNUM, |
| 214 | buf + offsetof (usr_fcontext_t, ufc_inst_sel)); |
| 215 | collect_register (regcache, I386_FIOFF_REGNUM, |
| 216 | buf + offsetof (usr_fcontext_t, ufc_inst_off)); |
| 217 | collect_register (regcache, I386_FOSEG_REGNUM, |
| 218 | buf + offsetof (usr_fcontext_t, ufc_data_sel)); |
| 219 | collect_register (regcache, I386_FOOFF_REGNUM, |
| 220 | buf + offsetof (usr_fcontext_t, ufc_data_off)); |
| 221 | collect_16bit_register (regcache, I386_FOP_REGNUM, |
| 222 | buf + offsetof (usr_fcontext_t, ufc_opcode)); |
| 223 | |
| 224 | /* Collect the XMM registers. */ |
| 225 | for (i = 0; i < 8; i++) |
| 226 | collect_register (regcache, I386_XMM0_REGNUM + i, |
| 227 | buf + offsetof (usr_fcontext_t, uxmm_reg) |
| 228 | + i * sizeof (struct uxmm_register)); |
| 229 | collect_register (regcache, I386_MXCSR_REGNUM, |
| 230 | buf + offsetof (usr_fcontext_t, usse_mxcsr)); |
| 231 | } |
| 232 | |
| 233 | /* This is the supply counterpart for collect_16bit_register: |
| 234 | It extracts a 2byte value from BUF, and uses that value to |
| 235 | set REGNUM's value in the regcache. |
| 236 | |
| 237 | This is useful to supply the value of certain 16bit registers |
| 238 | which are known by GDBserver as 32bit registers (such as the Control |
| 239 | Register for instance). */ |
| 240 | |
| 241 | static void |
| 242 | supply_16bit_register (struct regcache *regcache, int regnum, const char *buf) |
| 243 | { |
| 244 | gdb_byte word[4]; |
| 245 | |
| 246 | memcpy (word, buf, 2); |
| 247 | memset (word + 2, 0, 2); |
| 248 | supply_register (regcache, regnum, word); |
| 249 | } |
| 250 | |
| 251 | /* The store_function for the floating-point register set. */ |
| 252 | |
| 253 | static void |
| 254 | lynx_i386_store_fpregset (struct regcache *regcache, const char *buf) |
| 255 | { |
| 256 | int i; |
| 257 | |
| 258 | /* Store the %st0 .. %st7 registers. */ |
| 259 | for (i = 0; i < 8; i++) |
| 260 | supply_register (regcache, I386_ST0_REGNUM + i, |
| 261 | buf + offsetof (usr_fcontext_t, ufc_reg) |
| 262 | + i * sizeof (struct ufp387_real)); |
| 263 | |
| 264 | /* Store the other FPU registers. */ |
| 265 | supply_16bit_register (regcache, I386_FCTRL_REGNUM, |
| 266 | buf + offsetof (usr_fcontext_t, ufc_control)); |
| 267 | supply_16bit_register (regcache, I386_FSTAT_REGNUM, |
| 268 | buf + offsetof (usr_fcontext_t, ufc_status)); |
| 269 | supply_16bit_register (regcache, I386_FTAG_REGNUM, |
| 270 | buf + offsetof (usr_fcontext_t, ufc_tag)); |
| 271 | supply_register (regcache, I386_FISEG_REGNUM, |
| 272 | buf + offsetof (usr_fcontext_t, ufc_inst_sel)); |
| 273 | supply_register (regcache, I386_FIOFF_REGNUM, |
| 274 | buf + offsetof (usr_fcontext_t, ufc_inst_off)); |
| 275 | supply_register (regcache, I386_FOSEG_REGNUM, |
| 276 | buf + offsetof (usr_fcontext_t, ufc_data_sel)); |
| 277 | supply_register (regcache, I386_FOOFF_REGNUM, |
| 278 | buf + offsetof (usr_fcontext_t, ufc_data_off)); |
| 279 | supply_16bit_register (regcache, I386_FOP_REGNUM, |
| 280 | buf + offsetof (usr_fcontext_t, ufc_opcode)); |
| 281 | |
| 282 | /* Store the XMM registers. */ |
| 283 | for (i = 0; i < 8; i++) |
| 284 | supply_register (regcache, I386_XMM0_REGNUM + i, |
| 285 | buf + offsetof (usr_fcontext_t, uxmm_reg) |
| 286 | + i * sizeof (struct uxmm_register)); |
| 287 | supply_register (regcache, I386_MXCSR_REGNUM, |
| 288 | buf + offsetof (usr_fcontext_t, usse_mxcsr)); |
| 289 | } |
| 290 | |
| 291 | /* Implements the lynx_target_ops.arch_setup routine. */ |
| 292 | |
| 293 | static void |
| 294 | lynx_i386_arch_setup (void) |
| 295 | { |
| 296 | lynx_tdesc = i386_create_target_description (X86_XSTATE_SSE_MASK, false); |
| 297 | } |
| 298 | |
| 299 | /* Description of all the x86-lynx register sets. */ |
| 300 | |
| 301 | struct lynx_regset_info lynx_target_regsets[] = { |
| 302 | /* General Purpose Registers. */ |
| 303 | {PTRACE_GETREGS, PTRACE_SETREGS, sizeof(usr_econtext_t), |
| 304 | lynx_i386_fill_gregset, lynx_i386_store_gregset}, |
| 305 | /* Floating Point Registers. */ |
| 306 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof(usr_fcontext_t), |
| 307 | lynx_i386_fill_fpregset, lynx_i386_store_fpregset }, |
| 308 | /* End of list marker. */ |
| 309 | {0, 0, -1, NULL, NULL } |
| 310 | }; |
| 311 | |
| 312 | /* The lynx_target_ops vector for x86-lynx. */ |
| 313 | |
| 314 | struct lynx_target_ops the_low_target = { |
| 315 | lynx_i386_arch_setup, |
| 316 | }; |