| 1 | /* Copyright (C) 2010-2019 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 "common/x86-xstate.h" |
| 23 | #include "arch/i386.h" |
| 24 | #include "x86-tdesc.h" |
| 25 | |
| 26 | /* The following two typedefs are defined in a .h file which is not |
| 27 | in the standard include path (/sys/include/family/x86/ucontext.h), |
| 28 | so we just duplicate them here. |
| 29 | |
| 30 | Unfortunately for us, the definition of this structure differs between |
| 31 | LynxOS 5.x and LynxOS 178. Rather than duplicate the code, we use |
| 32 | different definitions depending on the target. */ |
| 33 | |
| 34 | #ifdef VMOS_DEV |
| 35 | #define LYNXOS_178 |
| 36 | #endif |
| 37 | |
| 38 | /* General register context */ |
| 39 | typedef struct usr_econtext { |
| 40 | |
| 41 | uint32_t uec_fault; |
| 42 | uint32_t uec_es; |
| 43 | uint32_t uec_ds; |
| 44 | uint32_t uec_edi; |
| 45 | uint32_t uec_esi; |
| 46 | uint32_t uec_ebp; |
| 47 | uint32_t uec_temp; |
| 48 | uint32_t uec_ebx; |
| 49 | uint32_t uec_edx; |
| 50 | uint32_t uec_ecx; |
| 51 | uint32_t uec_eax; |
| 52 | uint32_t uec_inum; |
| 53 | uint32_t uec_ecode; |
| 54 | uint32_t uec_eip; |
| 55 | uint32_t uec_cs; |
| 56 | uint32_t uec_eflags; |
| 57 | uint32_t uec_esp; |
| 58 | uint32_t uec_ss; |
| 59 | uint32_t uec_fs; |
| 60 | uint32_t uec_gs; |
| 61 | } usr_econtext_t; |
| 62 | |
| 63 | #if defined(LYNXOS_178) |
| 64 | |
| 65 | /* Floating point register context */ |
| 66 | typedef struct usr_fcontext { |
| 67 | uint32_t ufc_control; |
| 68 | uint32_t ufc_status; |
| 69 | uint32_t ufc_tag; |
| 70 | uint8_t *ufc_inst_off; |
| 71 | uint32_t ufc_inst_sel; |
| 72 | uint8_t *ufc_data_off; |
| 73 | uint32_t ufc_data_sel; |
| 74 | struct ufp387_real { |
| 75 | uint16_t umant4; |
| 76 | uint16_t umant3; |
| 77 | uint16_t umant2; |
| 78 | uint16_t umant1; |
| 79 | uint16_t us_and_e; |
| 80 | } ufc_reg[8]; |
| 81 | } usr_fcontext_t; |
| 82 | |
| 83 | #else /* This is LynxOS 5.x. */ |
| 84 | |
| 85 | /* Floating point and SIMD register context */ |
| 86 | typedef struct usr_fcontext { |
| 87 | uint16_t ufc_control; |
| 88 | uint16_t ufc_status; |
| 89 | uint16_t ufc_tag; |
| 90 | uint16_t ufc_opcode; |
| 91 | uint8_t *ufc_inst_off; |
| 92 | uint32_t ufc_inst_sel; |
| 93 | uint8_t *ufc_data_off; |
| 94 | uint32_t ufc_data_sel; |
| 95 | uint32_t usse_mxcsr; |
| 96 | uint32_t usse_mxcsr_mask; |
| 97 | struct ufp387_real { |
| 98 | uint16_t umant4; |
| 99 | uint16_t umant3; |
| 100 | uint16_t umant2; |
| 101 | uint16_t umant1; |
| 102 | uint16_t us_and_e; |
| 103 | uint16_t ureserved_1; |
| 104 | uint16_t ureserved_2; |
| 105 | uint16_t ureserved_3; |
| 106 | } ufc_reg[8]; |
| 107 | struct uxmm_register { |
| 108 | uint16_t uchunk_1; |
| 109 | uint16_t uchunk_2; |
| 110 | uint16_t uchunk_3; |
| 111 | uint16_t uchunk_4; |
| 112 | uint16_t uchunk_5; |
| 113 | uint16_t uchunk_6; |
| 114 | uint16_t uchunk_7; |
| 115 | uint16_t uchunk_8; |
| 116 | } uxmm_reg[8]; |
| 117 | char ureserved[16][14]; |
| 118 | } usr_fcontext_t; |
| 119 | |
| 120 | #endif |
| 121 | |
| 122 | /* The index of various registers inside the regcache. */ |
| 123 | |
| 124 | enum lynx_i386_gdb_regnum |
| 125 | { |
| 126 | I386_EAX_REGNUM, |
| 127 | I386_ECX_REGNUM, |
| 128 | I386_EDX_REGNUM, |
| 129 | I386_EBX_REGNUM, |
| 130 | I386_ESP_REGNUM, |
| 131 | I386_EBP_REGNUM, |
| 132 | I386_ESI_REGNUM, |
| 133 | I386_EDI_REGNUM, |
| 134 | I386_EIP_REGNUM, |
| 135 | I386_EFLAGS_REGNUM, |
| 136 | I386_CS_REGNUM, |
| 137 | I386_SS_REGNUM, |
| 138 | I386_DS_REGNUM, |
| 139 | I386_ES_REGNUM, |
| 140 | I386_FS_REGNUM, |
| 141 | I386_GS_REGNUM, |
| 142 | I386_ST0_REGNUM, |
| 143 | I386_FCTRL_REGNUM = I386_ST0_REGNUM + 8, |
| 144 | I386_FSTAT_REGNUM, |
| 145 | I386_FTAG_REGNUM, |
| 146 | I386_FISEG_REGNUM, |
| 147 | I386_FIOFF_REGNUM, |
| 148 | I386_FOSEG_REGNUM, |
| 149 | I386_FOOFF_REGNUM, |
| 150 | I386_FOP_REGNUM, |
| 151 | I386_XMM0_REGNUM = 32, |
| 152 | I386_MXCSR_REGNUM = I386_XMM0_REGNUM + 8, |
| 153 | I386_SENTINEL_REGUM |
| 154 | }; |
| 155 | |
| 156 | /* The fill_function for the general-purpose register set. */ |
| 157 | |
| 158 | static void |
| 159 | lynx_i386_fill_gregset (struct regcache *regcache, char *buf) |
| 160 | { |
| 161 | #define lynx_i386_collect_gp(regnum, fld) \ |
| 162 | collect_register (regcache, regnum, \ |
| 163 | buf + offsetof (usr_econtext_t, uec_##fld)) |
| 164 | |
| 165 | lynx_i386_collect_gp (I386_EAX_REGNUM, eax); |
| 166 | lynx_i386_collect_gp (I386_ECX_REGNUM, ecx); |
| 167 | lynx_i386_collect_gp (I386_EDX_REGNUM, edx); |
| 168 | lynx_i386_collect_gp (I386_EBX_REGNUM, ebx); |
| 169 | lynx_i386_collect_gp (I386_ESP_REGNUM, esp); |
| 170 | lynx_i386_collect_gp (I386_EBP_REGNUM, ebp); |
| 171 | lynx_i386_collect_gp (I386_ESI_REGNUM, esi); |
| 172 | lynx_i386_collect_gp (I386_EDI_REGNUM, edi); |
| 173 | lynx_i386_collect_gp (I386_EIP_REGNUM, eip); |
| 174 | lynx_i386_collect_gp (I386_EFLAGS_REGNUM, eflags); |
| 175 | lynx_i386_collect_gp (I386_CS_REGNUM, cs); |
| 176 | lynx_i386_collect_gp (I386_SS_REGNUM, ss); |
| 177 | lynx_i386_collect_gp (I386_DS_REGNUM, ds); |
| 178 | lynx_i386_collect_gp (I386_ES_REGNUM, es); |
| 179 | lynx_i386_collect_gp (I386_FS_REGNUM, fs); |
| 180 | lynx_i386_collect_gp (I386_GS_REGNUM, gs); |
| 181 | } |
| 182 | |
| 183 | /* The store_function for the general-purpose register set. */ |
| 184 | |
| 185 | static void |
| 186 | lynx_i386_store_gregset (struct regcache *regcache, const char *buf) |
| 187 | { |
| 188 | #define lynx_i386_supply_gp(regnum, fld) \ |
| 189 | supply_register (regcache, regnum, \ |
| 190 | buf + offsetof (usr_econtext_t, uec_##fld)) |
| 191 | |
| 192 | lynx_i386_supply_gp (I386_EAX_REGNUM, eax); |
| 193 | lynx_i386_supply_gp (I386_ECX_REGNUM, ecx); |
| 194 | lynx_i386_supply_gp (I386_EDX_REGNUM, edx); |
| 195 | lynx_i386_supply_gp (I386_EBX_REGNUM, ebx); |
| 196 | lynx_i386_supply_gp (I386_ESP_REGNUM, esp); |
| 197 | lynx_i386_supply_gp (I386_EBP_REGNUM, ebp); |
| 198 | lynx_i386_supply_gp (I386_ESI_REGNUM, esi); |
| 199 | lynx_i386_supply_gp (I386_EDI_REGNUM, edi); |
| 200 | lynx_i386_supply_gp (I386_EIP_REGNUM, eip); |
| 201 | lynx_i386_supply_gp (I386_EFLAGS_REGNUM, eflags); |
| 202 | lynx_i386_supply_gp (I386_CS_REGNUM, cs); |
| 203 | lynx_i386_supply_gp (I386_SS_REGNUM, ss); |
| 204 | lynx_i386_supply_gp (I386_DS_REGNUM, ds); |
| 205 | lynx_i386_supply_gp (I386_ES_REGNUM, es); |
| 206 | lynx_i386_supply_gp (I386_FS_REGNUM, fs); |
| 207 | lynx_i386_supply_gp (I386_GS_REGNUM, gs); |
| 208 | } |
| 209 | |
| 210 | /* Extract the first 16 bits of register REGNUM in the REGCACHE, |
| 211 | and store these 2 bytes at DEST. |
| 212 | |
| 213 | This is useful to collect certain 16bit registers which are known |
| 214 | by GDBserver as 32bit registers (such as the Control Register |
| 215 | for instance). */ |
| 216 | |
| 217 | static void |
| 218 | collect_16bit_register (struct regcache *regcache, int regnum, char *dest) |
| 219 | { |
| 220 | gdb_byte word[4]; |
| 221 | |
| 222 | collect_register (regcache, regnum, word); |
| 223 | memcpy (dest, word, 2); |
| 224 | } |
| 225 | |
| 226 | /* The fill_function for the floating-point register set. */ |
| 227 | |
| 228 | static void |
| 229 | lynx_i386_fill_fpregset (struct regcache *regcache, char *buf) |
| 230 | { |
| 231 | int i; |
| 232 | |
| 233 | /* Collect %st0 .. %st7. */ |
| 234 | for (i = 0; i < 8; i++) |
| 235 | collect_register (regcache, I386_ST0_REGNUM + i, |
| 236 | buf + offsetof (usr_fcontext_t, ufc_reg) |
| 237 | + i * sizeof (struct ufp387_real)); |
| 238 | |
| 239 | /* Collect the other FPU registers. */ |
| 240 | collect_16bit_register (regcache, I386_FCTRL_REGNUM, |
| 241 | buf + offsetof (usr_fcontext_t, ufc_control)); |
| 242 | collect_16bit_register (regcache, I386_FSTAT_REGNUM, |
| 243 | buf + offsetof (usr_fcontext_t, ufc_status)); |
| 244 | collect_16bit_register (regcache, I386_FTAG_REGNUM, |
| 245 | buf + offsetof (usr_fcontext_t, ufc_tag)); |
| 246 | collect_register (regcache, I386_FISEG_REGNUM, |
| 247 | buf + offsetof (usr_fcontext_t, ufc_inst_sel)); |
| 248 | collect_register (regcache, I386_FIOFF_REGNUM, |
| 249 | buf + offsetof (usr_fcontext_t, ufc_inst_off)); |
| 250 | collect_register (regcache, I386_FOSEG_REGNUM, |
| 251 | buf + offsetof (usr_fcontext_t, ufc_data_sel)); |
| 252 | collect_register (regcache, I386_FOOFF_REGNUM, |
| 253 | buf + offsetof (usr_fcontext_t, ufc_data_off)); |
| 254 | #if !defined(LYNXOS_178) |
| 255 | collect_16bit_register (regcache, I386_FOP_REGNUM, |
| 256 | buf + offsetof (usr_fcontext_t, ufc_opcode)); |
| 257 | |
| 258 | /* Collect the XMM registers. */ |
| 259 | for (i = 0; i < 8; i++) |
| 260 | collect_register (regcache, I386_XMM0_REGNUM + i, |
| 261 | buf + offsetof (usr_fcontext_t, uxmm_reg) |
| 262 | + i * sizeof (struct uxmm_register)); |
| 263 | collect_register (regcache, I386_MXCSR_REGNUM, |
| 264 | buf + offsetof (usr_fcontext_t, usse_mxcsr)); |
| 265 | #endif |
| 266 | } |
| 267 | |
| 268 | /* This is the supply counterpart for collect_16bit_register: |
| 269 | It extracts a 2byte value from BUF, and uses that value to |
| 270 | set REGNUM's value in the regcache. |
| 271 | |
| 272 | This is useful to supply the value of certain 16bit registers |
| 273 | which are known by GDBserver as 32bit registers (such as the Control |
| 274 | Register for instance). */ |
| 275 | |
| 276 | static void |
| 277 | supply_16bit_register (struct regcache *regcache, int regnum, const char *buf) |
| 278 | { |
| 279 | gdb_byte word[4]; |
| 280 | |
| 281 | memcpy (word, buf, 2); |
| 282 | memset (word + 2, 0, 2); |
| 283 | supply_register (regcache, regnum, word); |
| 284 | } |
| 285 | |
| 286 | /* The store_function for the floating-point register set. */ |
| 287 | |
| 288 | static void |
| 289 | lynx_i386_store_fpregset (struct regcache *regcache, const char *buf) |
| 290 | { |
| 291 | int i; |
| 292 | |
| 293 | /* Store the %st0 .. %st7 registers. */ |
| 294 | for (i = 0; i < 8; i++) |
| 295 | supply_register (regcache, I386_ST0_REGNUM + i, |
| 296 | buf + offsetof (usr_fcontext_t, ufc_reg) |
| 297 | + i * sizeof (struct ufp387_real)); |
| 298 | |
| 299 | /* Store the other FPU registers. */ |
| 300 | supply_16bit_register (regcache, I386_FCTRL_REGNUM, |
| 301 | buf + offsetof (usr_fcontext_t, ufc_control)); |
| 302 | supply_16bit_register (regcache, I386_FSTAT_REGNUM, |
| 303 | buf + offsetof (usr_fcontext_t, ufc_status)); |
| 304 | supply_16bit_register (regcache, I386_FTAG_REGNUM, |
| 305 | buf + offsetof (usr_fcontext_t, ufc_tag)); |
| 306 | supply_register (regcache, I386_FISEG_REGNUM, |
| 307 | buf + offsetof (usr_fcontext_t, ufc_inst_sel)); |
| 308 | supply_register (regcache, I386_FIOFF_REGNUM, |
| 309 | buf + offsetof (usr_fcontext_t, ufc_inst_off)); |
| 310 | supply_register (regcache, I386_FOSEG_REGNUM, |
| 311 | buf + offsetof (usr_fcontext_t, ufc_data_sel)); |
| 312 | supply_register (regcache, I386_FOOFF_REGNUM, |
| 313 | buf + offsetof (usr_fcontext_t, ufc_data_off)); |
| 314 | #if !defined(LYNXOS_178) |
| 315 | supply_16bit_register (regcache, I386_FOP_REGNUM, |
| 316 | buf + offsetof (usr_fcontext_t, ufc_opcode)); |
| 317 | |
| 318 | /* Store the XMM registers. */ |
| 319 | for (i = 0; i < 8; i++) |
| 320 | supply_register (regcache, I386_XMM0_REGNUM + i, |
| 321 | buf + offsetof (usr_fcontext_t, uxmm_reg) |
| 322 | + i * sizeof (struct uxmm_register)); |
| 323 | supply_register (regcache, I386_MXCSR_REGNUM, |
| 324 | buf + offsetof (usr_fcontext_t, usse_mxcsr)); |
| 325 | #endif |
| 326 | } |
| 327 | |
| 328 | /* Implements the lynx_target_ops.arch_setup routine. */ |
| 329 | |
| 330 | static void |
| 331 | lynx_i386_arch_setup (void) |
| 332 | { |
| 333 | struct target_desc *tdesc |
| 334 | = i386_create_target_description (X86_XSTATE_SSE_MASK, false); |
| 335 | |
| 336 | init_target_desc (tdesc, i386_expedite_regs); |
| 337 | |
| 338 | lynx_tdesc = tdesc; |
| 339 | } |
| 340 | |
| 341 | /* Description of all the x86-lynx register sets. */ |
| 342 | |
| 343 | struct lynx_regset_info lynx_target_regsets[] = { |
| 344 | /* General Purpose Registers. */ |
| 345 | {PTRACE_GETREGS, PTRACE_SETREGS, sizeof(usr_econtext_t), |
| 346 | lynx_i386_fill_gregset, lynx_i386_store_gregset}, |
| 347 | /* Floating Point Registers. */ |
| 348 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof(usr_fcontext_t), |
| 349 | lynx_i386_fill_fpregset, lynx_i386_store_fpregset }, |
| 350 | /* End of list marker. */ |
| 351 | {0, 0, -1, NULL, NULL } |
| 352 | }; |
| 353 | |
| 354 | /* The lynx_target_ops vector for x86-lynx. */ |
| 355 | |
| 356 | struct lynx_target_ops the_low_target = { |
| 357 | lynx_i386_arch_setup, |
| 358 | }; |