| 1 | /* Darwin support for GDB, the GNU debugger. |
| 2 | Copyright (C) 1997-2017 Free Software Foundation, Inc. |
| 3 | |
| 4 | Contributed by Apple Computer, 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 "frame.h" |
| 23 | #include "inferior.h" |
| 24 | #include "target.h" |
| 25 | #include "symfile.h" |
| 26 | #include "symtab.h" |
| 27 | #include "objfiles.h" |
| 28 | #include "gdbcmd.h" |
| 29 | #include "regcache.h" |
| 30 | #include "i386-tdep.h" |
| 31 | #include "i387-tdep.h" |
| 32 | #include "gdbarch.h" |
| 33 | #include "arch-utils.h" |
| 34 | #include "gdbcore.h" |
| 35 | |
| 36 | #include "x86-nat.h" |
| 37 | #include "darwin-nat.h" |
| 38 | #include "i386-darwin-tdep.h" |
| 39 | |
| 40 | #ifdef BFD64 |
| 41 | #include "amd64-nat.h" |
| 42 | #include "amd64-tdep.h" |
| 43 | #include "amd64-darwin-tdep.h" |
| 44 | #endif |
| 45 | |
| 46 | /* Read register values from the inferior process. |
| 47 | If REGNO is -1, do this for all registers. |
| 48 | Otherwise, REGNO specifies which register (so we can save time). */ |
| 49 | static void |
| 50 | i386_darwin_fetch_inferior_registers (struct target_ops *ops, |
| 51 | struct regcache *regcache, int regno) |
| 52 | { |
| 53 | thread_t current_thread = ptid_get_tid (regcache_get_ptid (regcache)); |
| 54 | int fetched = 0; |
| 55 | struct gdbarch *gdbarch = regcache->arch (); |
| 56 | |
| 57 | #ifdef BFD64 |
| 58 | if (gdbarch_ptr_bit (gdbarch) == 64) |
| 59 | { |
| 60 | if (regno == -1 || amd64_native_gregset_supplies_p (gdbarch, regno)) |
| 61 | { |
| 62 | x86_thread_state_t gp_regs; |
| 63 | unsigned int gp_count = x86_THREAD_STATE_COUNT; |
| 64 | kern_return_t ret; |
| 65 | |
| 66 | ret = thread_get_state |
| 67 | (current_thread, x86_THREAD_STATE, (thread_state_t) & gp_regs, |
| 68 | &gp_count); |
| 69 | if (ret != KERN_SUCCESS) |
| 70 | { |
| 71 | printf_unfiltered (_("Error calling thread_get_state for " |
| 72 | "GP registers for thread 0x%lx\n"), |
| 73 | (unsigned long) current_thread); |
| 74 | MACH_CHECK_ERROR (ret); |
| 75 | } |
| 76 | |
| 77 | /* Some kernels don't sanitize the values. */ |
| 78 | gp_regs.uts.ts64.__fs &= 0xffff; |
| 79 | gp_regs.uts.ts64.__gs &= 0xffff; |
| 80 | |
| 81 | amd64_supply_native_gregset (regcache, &gp_regs.uts, -1); |
| 82 | fetched++; |
| 83 | } |
| 84 | |
| 85 | if (regno == -1 || !amd64_native_gregset_supplies_p (gdbarch, regno)) |
| 86 | { |
| 87 | x86_float_state_t fp_regs; |
| 88 | unsigned int fp_count = x86_FLOAT_STATE_COUNT; |
| 89 | kern_return_t ret; |
| 90 | |
| 91 | ret = thread_get_state |
| 92 | (current_thread, x86_FLOAT_STATE, (thread_state_t) & fp_regs, |
| 93 | &fp_count); |
| 94 | if (ret != KERN_SUCCESS) |
| 95 | { |
| 96 | printf_unfiltered (_("Error calling thread_get_state for " |
| 97 | "float registers for thread 0x%lx\n"), |
| 98 | (unsigned long) current_thread); |
| 99 | MACH_CHECK_ERROR (ret); |
| 100 | } |
| 101 | amd64_supply_fxsave (regcache, -1, &fp_regs.ufs.fs64.__fpu_fcw); |
| 102 | fetched++; |
| 103 | } |
| 104 | } |
| 105 | else |
| 106 | #endif |
| 107 | { |
| 108 | if (regno == -1 || regno < I386_NUM_GREGS) |
| 109 | { |
| 110 | x86_thread_state32_t gp_regs; |
| 111 | unsigned int gp_count = x86_THREAD_STATE32_COUNT; |
| 112 | kern_return_t ret; |
| 113 | int i; |
| 114 | |
| 115 | ret = thread_get_state |
| 116 | (current_thread, x86_THREAD_STATE32, (thread_state_t) &gp_regs, |
| 117 | &gp_count); |
| 118 | if (ret != KERN_SUCCESS) |
| 119 | { |
| 120 | printf_unfiltered (_("Error calling thread_get_state for " |
| 121 | "GP registers for thread 0x%lx\n"), |
| 122 | (unsigned long) current_thread); |
| 123 | MACH_CHECK_ERROR (ret); |
| 124 | } |
| 125 | for (i = 0; i < I386_NUM_GREGS; i++) |
| 126 | regcache_raw_supply |
| 127 | (regcache, i, |
| 128 | (char *)&gp_regs + i386_darwin_thread_state_reg_offset[i]); |
| 129 | |
| 130 | fetched++; |
| 131 | } |
| 132 | |
| 133 | if (regno == -1 |
| 134 | || (regno >= I386_ST0_REGNUM && regno < I386_SSE_NUM_REGS)) |
| 135 | { |
| 136 | x86_float_state32_t fp_regs; |
| 137 | unsigned int fp_count = x86_FLOAT_STATE32_COUNT; |
| 138 | kern_return_t ret; |
| 139 | |
| 140 | ret = thread_get_state |
| 141 | (current_thread, x86_FLOAT_STATE32, (thread_state_t) &fp_regs, |
| 142 | &fp_count); |
| 143 | if (ret != KERN_SUCCESS) |
| 144 | { |
| 145 | printf_unfiltered (_("Error calling thread_get_state for " |
| 146 | "float registers for thread 0x%lx\n"), |
| 147 | (unsigned long) current_thread); |
| 148 | MACH_CHECK_ERROR (ret); |
| 149 | } |
| 150 | i387_supply_fxsave (regcache, -1, &fp_regs.__fpu_fcw); |
| 151 | fetched++; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | if (! fetched) |
| 156 | { |
| 157 | warning (_("unknown register %d"), regno); |
| 158 | regcache_raw_supply (regcache, regno, NULL); |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | /* Store our register values back into the inferior. |
| 163 | If REGNO is -1, do this for all registers. |
| 164 | Otherwise, REGNO specifies which register (so we can save time). */ |
| 165 | |
| 166 | static void |
| 167 | i386_darwin_store_inferior_registers (struct target_ops *ops, |
| 168 | struct regcache *regcache, int regno) |
| 169 | { |
| 170 | thread_t current_thread = ptid_get_tid (regcache_get_ptid (regcache)); |
| 171 | struct gdbarch *gdbarch = regcache->arch (); |
| 172 | |
| 173 | #ifdef BFD64 |
| 174 | if (gdbarch_ptr_bit (gdbarch) == 64) |
| 175 | { |
| 176 | if (regno == -1 || amd64_native_gregset_supplies_p (gdbarch, regno)) |
| 177 | { |
| 178 | x86_thread_state_t gp_regs; |
| 179 | kern_return_t ret; |
| 180 | unsigned int gp_count = x86_THREAD_STATE_COUNT; |
| 181 | |
| 182 | ret = thread_get_state |
| 183 | (current_thread, x86_THREAD_STATE, (thread_state_t) &gp_regs, |
| 184 | &gp_count); |
| 185 | MACH_CHECK_ERROR (ret); |
| 186 | gdb_assert (gp_regs.tsh.flavor == x86_THREAD_STATE64); |
| 187 | gdb_assert (gp_regs.tsh.count == x86_THREAD_STATE64_COUNT); |
| 188 | |
| 189 | amd64_collect_native_gregset (regcache, &gp_regs.uts, regno); |
| 190 | |
| 191 | /* Some kernels don't sanitize the values. */ |
| 192 | gp_regs.uts.ts64.__fs &= 0xffff; |
| 193 | gp_regs.uts.ts64.__gs &= 0xffff; |
| 194 | |
| 195 | ret = thread_set_state (current_thread, x86_THREAD_STATE, |
| 196 | (thread_state_t) &gp_regs, |
| 197 | x86_THREAD_STATE_COUNT); |
| 198 | MACH_CHECK_ERROR (ret); |
| 199 | } |
| 200 | |
| 201 | if (regno == -1 || !amd64_native_gregset_supplies_p (gdbarch, regno)) |
| 202 | { |
| 203 | x86_float_state_t fp_regs; |
| 204 | kern_return_t ret; |
| 205 | unsigned int fp_count = x86_FLOAT_STATE_COUNT; |
| 206 | |
| 207 | ret = thread_get_state |
| 208 | (current_thread, x86_FLOAT_STATE, (thread_state_t) & fp_regs, |
| 209 | &fp_count); |
| 210 | MACH_CHECK_ERROR (ret); |
| 211 | gdb_assert (fp_regs.fsh.flavor == x86_FLOAT_STATE64); |
| 212 | gdb_assert (fp_regs.fsh.count == x86_FLOAT_STATE64_COUNT); |
| 213 | |
| 214 | amd64_collect_fxsave (regcache, regno, &fp_regs.ufs.fs64.__fpu_fcw); |
| 215 | |
| 216 | ret = thread_set_state (current_thread, x86_FLOAT_STATE, |
| 217 | (thread_state_t) & fp_regs, |
| 218 | x86_FLOAT_STATE_COUNT); |
| 219 | MACH_CHECK_ERROR (ret); |
| 220 | } |
| 221 | } |
| 222 | else |
| 223 | #endif |
| 224 | { |
| 225 | if (regno == -1 || regno < I386_NUM_GREGS) |
| 226 | { |
| 227 | x86_thread_state32_t gp_regs; |
| 228 | kern_return_t ret; |
| 229 | unsigned int gp_count = x86_THREAD_STATE32_COUNT; |
| 230 | int i; |
| 231 | |
| 232 | ret = thread_get_state |
| 233 | (current_thread, x86_THREAD_STATE32, (thread_state_t) &gp_regs, |
| 234 | &gp_count); |
| 235 | MACH_CHECK_ERROR (ret); |
| 236 | |
| 237 | for (i = 0; i < I386_NUM_GREGS; i++) |
| 238 | if (regno == -1 || regno == i) |
| 239 | regcache_raw_collect |
| 240 | (regcache, i, |
| 241 | (char *)&gp_regs + i386_darwin_thread_state_reg_offset[i]); |
| 242 | |
| 243 | ret = thread_set_state (current_thread, x86_THREAD_STATE32, |
| 244 | (thread_state_t) &gp_regs, |
| 245 | x86_THREAD_STATE32_COUNT); |
| 246 | MACH_CHECK_ERROR (ret); |
| 247 | } |
| 248 | |
| 249 | if (regno == -1 |
| 250 | || (regno >= I386_ST0_REGNUM && regno < I386_SSE_NUM_REGS)) |
| 251 | { |
| 252 | x86_float_state32_t fp_regs; |
| 253 | unsigned int fp_count = x86_FLOAT_STATE32_COUNT; |
| 254 | kern_return_t ret; |
| 255 | |
| 256 | ret = thread_get_state |
| 257 | (current_thread, x86_FLOAT_STATE32, (thread_state_t) & fp_regs, |
| 258 | &fp_count); |
| 259 | MACH_CHECK_ERROR (ret); |
| 260 | |
| 261 | i387_collect_fxsave (regcache, regno, &fp_regs.__fpu_fcw); |
| 262 | |
| 263 | ret = thread_set_state (current_thread, x86_FLOAT_STATE32, |
| 264 | (thread_state_t) &fp_regs, |
| 265 | x86_FLOAT_STATE32_COUNT); |
| 266 | MACH_CHECK_ERROR (ret); |
| 267 | } |
| 268 | } |
| 269 | } |
| 270 | |
| 271 | /* Support for debug registers, boosted mostly from i386-linux-nat.c. */ |
| 272 | |
| 273 | static void |
| 274 | i386_darwin_dr_set (int regnum, CORE_ADDR value) |
| 275 | { |
| 276 | int current_pid; |
| 277 | thread_t current_thread; |
| 278 | x86_debug_state_t dr_regs; |
| 279 | kern_return_t ret; |
| 280 | unsigned int dr_count; |
| 281 | |
| 282 | gdb_assert (regnum >= 0 && regnum <= DR_CONTROL); |
| 283 | |
| 284 | current_thread = ptid_get_tid (inferior_ptid); |
| 285 | |
| 286 | dr_regs.dsh.flavor = x86_DEBUG_STATE; |
| 287 | dr_regs.dsh.count = x86_DEBUG_STATE_COUNT; |
| 288 | dr_count = x86_DEBUG_STATE_COUNT; |
| 289 | ret = thread_get_state (current_thread, x86_DEBUG_STATE, |
| 290 | (thread_state_t) &dr_regs, &dr_count); |
| 291 | MACH_CHECK_ERROR (ret); |
| 292 | |
| 293 | switch (dr_regs.dsh.flavor) |
| 294 | { |
| 295 | case x86_DEBUG_STATE32: |
| 296 | switch (regnum) |
| 297 | { |
| 298 | case 0: |
| 299 | dr_regs.uds.ds32.__dr0 = value; |
| 300 | break; |
| 301 | case 1: |
| 302 | dr_regs.uds.ds32.__dr1 = value; |
| 303 | break; |
| 304 | case 2: |
| 305 | dr_regs.uds.ds32.__dr2 = value; |
| 306 | break; |
| 307 | case 3: |
| 308 | dr_regs.uds.ds32.__dr3 = value; |
| 309 | break; |
| 310 | case 4: |
| 311 | dr_regs.uds.ds32.__dr4 = value; |
| 312 | break; |
| 313 | case 5: |
| 314 | dr_regs.uds.ds32.__dr5 = value; |
| 315 | break; |
| 316 | case 6: |
| 317 | dr_regs.uds.ds32.__dr6 = value; |
| 318 | break; |
| 319 | case 7: |
| 320 | dr_regs.uds.ds32.__dr7 = value; |
| 321 | break; |
| 322 | } |
| 323 | break; |
| 324 | #ifdef BFD64 |
| 325 | case x86_DEBUG_STATE64: |
| 326 | switch (regnum) |
| 327 | { |
| 328 | case 0: |
| 329 | dr_regs.uds.ds64.__dr0 = value; |
| 330 | break; |
| 331 | case 1: |
| 332 | dr_regs.uds.ds64.__dr1 = value; |
| 333 | break; |
| 334 | case 2: |
| 335 | dr_regs.uds.ds64.__dr2 = value; |
| 336 | break; |
| 337 | case 3: |
| 338 | dr_regs.uds.ds64.__dr3 = value; |
| 339 | break; |
| 340 | case 4: |
| 341 | dr_regs.uds.ds64.__dr4 = value; |
| 342 | break; |
| 343 | case 5: |
| 344 | dr_regs.uds.ds64.__dr5 = value; |
| 345 | break; |
| 346 | case 6: |
| 347 | dr_regs.uds.ds64.__dr6 = value; |
| 348 | break; |
| 349 | case 7: |
| 350 | dr_regs.uds.ds64.__dr7 = value; |
| 351 | break; |
| 352 | } |
| 353 | break; |
| 354 | #endif |
| 355 | } |
| 356 | |
| 357 | ret = thread_set_state (current_thread, dr_regs.dsh.flavor, |
| 358 | (thread_state_t) &dr_regs.uds, dr_count); |
| 359 | |
| 360 | MACH_CHECK_ERROR (ret); |
| 361 | } |
| 362 | |
| 363 | static CORE_ADDR |
| 364 | i386_darwin_dr_get (int regnum) |
| 365 | { |
| 366 | thread_t current_thread; |
| 367 | x86_debug_state_t dr_regs; |
| 368 | kern_return_t ret; |
| 369 | unsigned int dr_count; |
| 370 | |
| 371 | gdb_assert (regnum >= 0 && regnum <= DR_CONTROL); |
| 372 | |
| 373 | current_thread = ptid_get_tid (inferior_ptid); |
| 374 | |
| 375 | dr_regs.dsh.flavor = x86_DEBUG_STATE; |
| 376 | dr_regs.dsh.count = x86_DEBUG_STATE_COUNT; |
| 377 | dr_count = x86_DEBUG_STATE_COUNT; |
| 378 | ret = thread_get_state (current_thread, x86_DEBUG_STATE, |
| 379 | (thread_state_t) &dr_regs, &dr_count); |
| 380 | MACH_CHECK_ERROR (ret); |
| 381 | |
| 382 | switch (dr_regs.dsh.flavor) |
| 383 | { |
| 384 | case x86_DEBUG_STATE32: |
| 385 | switch (regnum) |
| 386 | { |
| 387 | case 0: |
| 388 | return dr_regs.uds.ds32.__dr0; |
| 389 | case 1: |
| 390 | return dr_regs.uds.ds32.__dr1; |
| 391 | case 2: |
| 392 | return dr_regs.uds.ds32.__dr2; |
| 393 | case 3: |
| 394 | return dr_regs.uds.ds32.__dr3; |
| 395 | case 4: |
| 396 | return dr_regs.uds.ds32.__dr4; |
| 397 | case 5: |
| 398 | return dr_regs.uds.ds32.__dr5; |
| 399 | case 6: |
| 400 | return dr_regs.uds.ds32.__dr6; |
| 401 | case 7: |
| 402 | return dr_regs.uds.ds32.__dr7; |
| 403 | default: |
| 404 | return -1; |
| 405 | } |
| 406 | break; |
| 407 | #ifdef BFD64 |
| 408 | case x86_DEBUG_STATE64: |
| 409 | switch (regnum) |
| 410 | { |
| 411 | case 0: |
| 412 | return dr_regs.uds.ds64.__dr0; |
| 413 | case 1: |
| 414 | return dr_regs.uds.ds64.__dr1; |
| 415 | case 2: |
| 416 | return dr_regs.uds.ds64.__dr2; |
| 417 | case 3: |
| 418 | return dr_regs.uds.ds64.__dr3; |
| 419 | case 4: |
| 420 | return dr_regs.uds.ds64.__dr4; |
| 421 | case 5: |
| 422 | return dr_regs.uds.ds64.__dr5; |
| 423 | case 6: |
| 424 | return dr_regs.uds.ds64.__dr6; |
| 425 | case 7: |
| 426 | return dr_regs.uds.ds64.__dr7; |
| 427 | default: |
| 428 | return -1; |
| 429 | } |
| 430 | break; |
| 431 | #endif |
| 432 | default: |
| 433 | return -1; |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | static void |
| 438 | i386_darwin_dr_set_control (unsigned long control) |
| 439 | { |
| 440 | i386_darwin_dr_set (DR_CONTROL, control); |
| 441 | } |
| 442 | |
| 443 | static void |
| 444 | i386_darwin_dr_set_addr (int regnum, CORE_ADDR addr) |
| 445 | { |
| 446 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
| 447 | |
| 448 | i386_darwin_dr_set (DR_FIRSTADDR + regnum, addr); |
| 449 | } |
| 450 | |
| 451 | static CORE_ADDR |
| 452 | i386_darwin_dr_get_addr (int regnum) |
| 453 | { |
| 454 | return i386_darwin_dr_get (regnum); |
| 455 | } |
| 456 | |
| 457 | static unsigned long |
| 458 | i386_darwin_dr_get_status (void) |
| 459 | { |
| 460 | return i386_darwin_dr_get (DR_STATUS); |
| 461 | } |
| 462 | |
| 463 | static unsigned long |
| 464 | i386_darwin_dr_get_control (void) |
| 465 | { |
| 466 | return i386_darwin_dr_get (DR_CONTROL); |
| 467 | } |
| 468 | |
| 469 | void |
| 470 | darwin_check_osabi (darwin_inferior *inf, thread_t thread) |
| 471 | { |
| 472 | if (gdbarch_osabi (target_gdbarch ()) == GDB_OSABI_UNKNOWN) |
| 473 | { |
| 474 | /* Attaching to a process. Let's figure out what kind it is. */ |
| 475 | x86_thread_state_t gp_regs; |
| 476 | struct gdbarch_info info; |
| 477 | unsigned int gp_count = x86_THREAD_STATE_COUNT; |
| 478 | kern_return_t ret; |
| 479 | |
| 480 | ret = thread_get_state (thread, x86_THREAD_STATE, |
| 481 | (thread_state_t) &gp_regs, &gp_count); |
| 482 | if (ret != KERN_SUCCESS) |
| 483 | { |
| 484 | MACH_CHECK_ERROR (ret); |
| 485 | return; |
| 486 | } |
| 487 | |
| 488 | gdbarch_info_init (&info); |
| 489 | gdbarch_info_fill (&info); |
| 490 | info.byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 491 | info.osabi = GDB_OSABI_DARWIN; |
| 492 | if (gp_regs.tsh.flavor == x86_THREAD_STATE64) |
| 493 | info.bfd_arch_info = bfd_lookup_arch (bfd_arch_i386, |
| 494 | bfd_mach_x86_64); |
| 495 | else |
| 496 | info.bfd_arch_info = bfd_lookup_arch (bfd_arch_i386, |
| 497 | bfd_mach_i386_i386); |
| 498 | gdbarch_update_p (info); |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | #define X86_EFLAGS_T 0x100UL |
| 503 | |
| 504 | /* Returning from a signal trampoline is done by calling a |
| 505 | special system call (sigreturn). This system call |
| 506 | restores the registers that were saved when the signal was |
| 507 | raised, including %eflags/%rflags. That means that single-stepping |
| 508 | won't work. Instead, we'll have to modify the signal context |
| 509 | that's about to be restored, and set the trace flag there. */ |
| 510 | |
| 511 | static int |
| 512 | i386_darwin_sstep_at_sigreturn (x86_thread_state_t *regs) |
| 513 | { |
| 514 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 515 | static const gdb_byte darwin_syscall[] = { 0xcd, 0x80 }; /* int 0x80 */ |
| 516 | gdb_byte buf[sizeof (darwin_syscall)]; |
| 517 | |
| 518 | /* Check if PC is at a sigreturn system call. */ |
| 519 | if (target_read_memory (regs->uts.ts32.__eip, buf, sizeof (buf)) == 0 |
| 520 | && memcmp (buf, darwin_syscall, sizeof (darwin_syscall)) == 0 |
| 521 | && regs->uts.ts32.__eax == 0xb8 /* SYS_sigreturn */) |
| 522 | { |
| 523 | ULONGEST uctx_addr; |
| 524 | ULONGEST mctx_addr; |
| 525 | ULONGEST flags_addr; |
| 526 | unsigned int eflags; |
| 527 | |
| 528 | uctx_addr = read_memory_unsigned_integer |
| 529 | (regs->uts.ts32.__esp + 4, 4, byte_order); |
| 530 | mctx_addr = read_memory_unsigned_integer |
| 531 | (uctx_addr + 28, 4, byte_order); |
| 532 | |
| 533 | flags_addr = mctx_addr + 12 + 9 * 4; |
| 534 | read_memory (flags_addr, (gdb_byte *) &eflags, 4); |
| 535 | eflags |= X86_EFLAGS_T; |
| 536 | write_memory (flags_addr, (gdb_byte *) &eflags, 4); |
| 537 | |
| 538 | return 1; |
| 539 | } |
| 540 | return 0; |
| 541 | } |
| 542 | |
| 543 | #ifdef BFD64 |
| 544 | static int |
| 545 | amd64_darwin_sstep_at_sigreturn (x86_thread_state_t *regs) |
| 546 | { |
| 547 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 548 | static const gdb_byte darwin_syscall[] = { 0x0f, 0x05 }; /* syscall */ |
| 549 | gdb_byte buf[sizeof (darwin_syscall)]; |
| 550 | |
| 551 | /* Check if PC is at a sigreturn system call. */ |
| 552 | if (target_read_memory (regs->uts.ts64.__rip, buf, sizeof (buf)) == 0 |
| 553 | && memcmp (buf, darwin_syscall, sizeof (darwin_syscall)) == 0 |
| 554 | && (regs->uts.ts64.__rax & 0xffffffff) == 0x20000b8 /* SYS_sigreturn */) |
| 555 | { |
| 556 | ULONGEST mctx_addr; |
| 557 | ULONGEST flags_addr; |
| 558 | unsigned int rflags; |
| 559 | |
| 560 | mctx_addr = read_memory_unsigned_integer |
| 561 | (regs->uts.ts64.__rdi + 48, 8, byte_order); |
| 562 | flags_addr = mctx_addr + 16 + 17 * 8; |
| 563 | |
| 564 | /* AMD64 is little endian. */ |
| 565 | read_memory (flags_addr, (gdb_byte *) &rflags, 4); |
| 566 | rflags |= X86_EFLAGS_T; |
| 567 | write_memory (flags_addr, (gdb_byte *) &rflags, 4); |
| 568 | |
| 569 | return 1; |
| 570 | } |
| 571 | return 0; |
| 572 | } |
| 573 | #endif |
| 574 | |
| 575 | void |
| 576 | darwin_set_sstep (thread_t thread, int enable) |
| 577 | { |
| 578 | x86_thread_state_t regs; |
| 579 | unsigned int count = x86_THREAD_STATE_COUNT; |
| 580 | kern_return_t kret; |
| 581 | |
| 582 | kret = thread_get_state (thread, x86_THREAD_STATE, |
| 583 | (thread_state_t) ®s, &count); |
| 584 | if (kret != KERN_SUCCESS) |
| 585 | { |
| 586 | printf_unfiltered (_("darwin_set_sstep: error %x, thread=%x\n"), |
| 587 | kret, thread); |
| 588 | return; |
| 589 | } |
| 590 | |
| 591 | switch (regs.tsh.flavor) |
| 592 | { |
| 593 | case x86_THREAD_STATE32: |
| 594 | { |
| 595 | __uint32_t bit = enable ? X86_EFLAGS_T : 0; |
| 596 | |
| 597 | if (enable && i386_darwin_sstep_at_sigreturn (®s)) |
| 598 | return; |
| 599 | if ((regs.uts.ts32.__eflags & X86_EFLAGS_T) == bit) |
| 600 | return; |
| 601 | regs.uts.ts32.__eflags |
| 602 | = (regs.uts.ts32.__eflags & ~X86_EFLAGS_T) | bit; |
| 603 | kret = thread_set_state (thread, x86_THREAD_STATE, |
| 604 | (thread_state_t) ®s, count); |
| 605 | MACH_CHECK_ERROR (kret); |
| 606 | } |
| 607 | break; |
| 608 | #ifdef BFD64 |
| 609 | case x86_THREAD_STATE64: |
| 610 | { |
| 611 | __uint64_t bit = enable ? X86_EFLAGS_T : 0; |
| 612 | |
| 613 | if (enable && amd64_darwin_sstep_at_sigreturn (®s)) |
| 614 | return; |
| 615 | if ((regs.uts.ts64.__rflags & X86_EFLAGS_T) == bit) |
| 616 | return; |
| 617 | regs.uts.ts64.__rflags |
| 618 | = (regs.uts.ts64.__rflags & ~X86_EFLAGS_T) | bit; |
| 619 | kret = thread_set_state (thread, x86_THREAD_STATE, |
| 620 | (thread_state_t) ®s, count); |
| 621 | MACH_CHECK_ERROR (kret); |
| 622 | } |
| 623 | break; |
| 624 | #endif |
| 625 | default: |
| 626 | error (_("darwin_set_sstep: unknown flavour: %d"), regs.tsh.flavor); |
| 627 | } |
| 628 | } |
| 629 | |
| 630 | void |
| 631 | darwin_complete_target (struct target_ops *target) |
| 632 | { |
| 633 | #ifdef BFD64 |
| 634 | amd64_native_gregset64_reg_offset = amd64_darwin_thread_state_reg_offset; |
| 635 | amd64_native_gregset64_num_regs = amd64_darwin_thread_state_num_regs; |
| 636 | amd64_native_gregset32_reg_offset = i386_darwin_thread_state_reg_offset; |
| 637 | amd64_native_gregset32_num_regs = i386_darwin_thread_state_num_regs; |
| 638 | #endif |
| 639 | |
| 640 | x86_use_watchpoints (target); |
| 641 | |
| 642 | x86_dr_low.set_control = i386_darwin_dr_set_control; |
| 643 | x86_dr_low.set_addr = i386_darwin_dr_set_addr; |
| 644 | x86_dr_low.get_addr = i386_darwin_dr_get_addr; |
| 645 | x86_dr_low.get_status = i386_darwin_dr_get_status; |
| 646 | x86_dr_low.get_control = i386_darwin_dr_get_control; |
| 647 | |
| 648 | /* Let's assume that the kernel is 64 bits iff the executable is. */ |
| 649 | #ifdef __x86_64__ |
| 650 | x86_set_debug_register_length (8); |
| 651 | #else |
| 652 | x86_set_debug_register_length (4); |
| 653 | #endif |
| 654 | |
| 655 | target->to_fetch_registers = i386_darwin_fetch_inferior_registers; |
| 656 | target->to_store_registers = i386_darwin_store_inferior_registers; |
| 657 | } |