| 1 | /* Native-dependent code for GNU/Linux AArch64. |
| 2 | |
| 3 | Copyright (C) 2011-2016 Free Software Foundation, Inc. |
| 4 | Contributed by ARM Ltd. |
| 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 | |
| 23 | #include "inferior.h" |
| 24 | #include "gdbcore.h" |
| 25 | #include "regcache.h" |
| 26 | #include "linux-nat.h" |
| 27 | #include "target-descriptions.h" |
| 28 | #include "auxv.h" |
| 29 | #include "gdbcmd.h" |
| 30 | #include "aarch64-tdep.h" |
| 31 | #include "aarch64-linux-tdep.h" |
| 32 | #include "aarch32-linux-nat.h" |
| 33 | #include "nat/aarch64-linux.h" |
| 34 | #include "nat/aarch64-linux-hw-point.h" |
| 35 | |
| 36 | #include "elf/external.h" |
| 37 | #include "elf/common.h" |
| 38 | |
| 39 | #include "nat/gdb_ptrace.h" |
| 40 | #include <sys/utsname.h> |
| 41 | #include <asm/ptrace.h> |
| 42 | |
| 43 | #include "gregset.h" |
| 44 | |
| 45 | /* Defines ps_err_e, struct ps_prochandle. */ |
| 46 | #include "gdb_proc_service.h" |
| 47 | |
| 48 | #ifndef TRAP_HWBKPT |
| 49 | #define TRAP_HWBKPT 0x0004 |
| 50 | #endif |
| 51 | |
| 52 | /* Per-process data. We don't bind this to a per-inferior registry |
| 53 | because of targets like x86 GNU/Linux that need to keep track of |
| 54 | processes that aren't bound to any inferior (e.g., fork children, |
| 55 | checkpoints). */ |
| 56 | |
| 57 | struct aarch64_process_info |
| 58 | { |
| 59 | /* Linked list. */ |
| 60 | struct aarch64_process_info *next; |
| 61 | |
| 62 | /* The process identifier. */ |
| 63 | pid_t pid; |
| 64 | |
| 65 | /* Copy of aarch64 hardware debug registers. */ |
| 66 | struct aarch64_debug_reg_state state; |
| 67 | }; |
| 68 | |
| 69 | static struct aarch64_process_info *aarch64_process_list = NULL; |
| 70 | |
| 71 | /* Find process data for process PID. */ |
| 72 | |
| 73 | static struct aarch64_process_info * |
| 74 | aarch64_find_process_pid (pid_t pid) |
| 75 | { |
| 76 | struct aarch64_process_info *proc; |
| 77 | |
| 78 | for (proc = aarch64_process_list; proc; proc = proc->next) |
| 79 | if (proc->pid == pid) |
| 80 | return proc; |
| 81 | |
| 82 | return NULL; |
| 83 | } |
| 84 | |
| 85 | /* Add process data for process PID. Returns newly allocated info |
| 86 | object. */ |
| 87 | |
| 88 | static struct aarch64_process_info * |
| 89 | aarch64_add_process (pid_t pid) |
| 90 | { |
| 91 | struct aarch64_process_info *proc; |
| 92 | |
| 93 | proc = XCNEW (struct aarch64_process_info); |
| 94 | proc->pid = pid; |
| 95 | |
| 96 | proc->next = aarch64_process_list; |
| 97 | aarch64_process_list = proc; |
| 98 | |
| 99 | return proc; |
| 100 | } |
| 101 | |
| 102 | /* Get data specific info for process PID, creating it if necessary. |
| 103 | Never returns NULL. */ |
| 104 | |
| 105 | static struct aarch64_process_info * |
| 106 | aarch64_process_info_get (pid_t pid) |
| 107 | { |
| 108 | struct aarch64_process_info *proc; |
| 109 | |
| 110 | proc = aarch64_find_process_pid (pid); |
| 111 | if (proc == NULL) |
| 112 | proc = aarch64_add_process (pid); |
| 113 | |
| 114 | return proc; |
| 115 | } |
| 116 | |
| 117 | /* Called whenever GDB is no longer debugging process PID. It deletes |
| 118 | data structures that keep track of debug register state. */ |
| 119 | |
| 120 | static void |
| 121 | aarch64_forget_process (pid_t pid) |
| 122 | { |
| 123 | struct aarch64_process_info *proc, **proc_link; |
| 124 | |
| 125 | proc = aarch64_process_list; |
| 126 | proc_link = &aarch64_process_list; |
| 127 | |
| 128 | while (proc != NULL) |
| 129 | { |
| 130 | if (proc->pid == pid) |
| 131 | { |
| 132 | *proc_link = proc->next; |
| 133 | |
| 134 | xfree (proc); |
| 135 | return; |
| 136 | } |
| 137 | |
| 138 | proc_link = &proc->next; |
| 139 | proc = *proc_link; |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | /* Get debug registers state for process PID. */ |
| 144 | |
| 145 | struct aarch64_debug_reg_state * |
| 146 | aarch64_get_debug_reg_state (pid_t pid) |
| 147 | { |
| 148 | return &aarch64_process_info_get (pid)->state; |
| 149 | } |
| 150 | |
| 151 | /* Fill GDB's register array with the general-purpose register values |
| 152 | from the current thread. */ |
| 153 | |
| 154 | static void |
| 155 | fetch_gregs_from_thread (struct regcache *regcache) |
| 156 | { |
| 157 | int ret, tid; |
| 158 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 159 | elf_gregset_t regs; |
| 160 | struct iovec iovec; |
| 161 | |
| 162 | /* Make sure REGS can hold all registers contents on both aarch64 |
| 163 | and arm. */ |
| 164 | gdb_static_assert (sizeof (regs) >= 18 * 4); |
| 165 | |
| 166 | tid = ptid_get_lwp (inferior_ptid); |
| 167 | |
| 168 | iovec.iov_base = ®s; |
| 169 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) |
| 170 | iovec.iov_len = 18 * 4; |
| 171 | else |
| 172 | iovec.iov_len = sizeof (regs); |
| 173 | |
| 174 | ret = ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec); |
| 175 | if (ret < 0) |
| 176 | perror_with_name (_("Unable to fetch general registers.")); |
| 177 | |
| 178 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) |
| 179 | aarch32_gp_regcache_supply (regcache, (uint32_t *) regs, 1); |
| 180 | else |
| 181 | { |
| 182 | int regno; |
| 183 | |
| 184 | for (regno = AARCH64_X0_REGNUM; regno <= AARCH64_CPSR_REGNUM; regno++) |
| 185 | regcache_raw_supply (regcache, regno, ®s[regno - AARCH64_X0_REGNUM]); |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | /* Store to the current thread the valid general-purpose register |
| 190 | values in the GDB's register array. */ |
| 191 | |
| 192 | static void |
| 193 | store_gregs_to_thread (const struct regcache *regcache) |
| 194 | { |
| 195 | int ret, tid; |
| 196 | elf_gregset_t regs; |
| 197 | struct iovec iovec; |
| 198 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 199 | |
| 200 | /* Make sure REGS can hold all registers contents on both aarch64 |
| 201 | and arm. */ |
| 202 | gdb_static_assert (sizeof (regs) >= 18 * 4); |
| 203 | tid = ptid_get_lwp (inferior_ptid); |
| 204 | |
| 205 | iovec.iov_base = ®s; |
| 206 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) |
| 207 | iovec.iov_len = 18 * 4; |
| 208 | else |
| 209 | iovec.iov_len = sizeof (regs); |
| 210 | |
| 211 | ret = ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec); |
| 212 | if (ret < 0) |
| 213 | perror_with_name (_("Unable to fetch general registers.")); |
| 214 | |
| 215 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) |
| 216 | aarch32_gp_regcache_collect (regcache, (uint32_t *) regs, 1); |
| 217 | else |
| 218 | { |
| 219 | int regno; |
| 220 | |
| 221 | for (regno = AARCH64_X0_REGNUM; regno <= AARCH64_CPSR_REGNUM; regno++) |
| 222 | if (REG_VALID == regcache_register_status (regcache, regno)) |
| 223 | regcache_raw_collect (regcache, regno, |
| 224 | ®s[regno - AARCH64_X0_REGNUM]); |
| 225 | } |
| 226 | |
| 227 | ret = ptrace (PTRACE_SETREGSET, tid, NT_PRSTATUS, &iovec); |
| 228 | if (ret < 0) |
| 229 | perror_with_name (_("Unable to store general registers.")); |
| 230 | } |
| 231 | |
| 232 | /* Fill GDB's register array with the fp/simd register values |
| 233 | from the current thread. */ |
| 234 | |
| 235 | static void |
| 236 | fetch_fpregs_from_thread (struct regcache *regcache) |
| 237 | { |
| 238 | int ret, tid; |
| 239 | elf_fpregset_t regs; |
| 240 | struct iovec iovec; |
| 241 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 242 | |
| 243 | /* Make sure REGS can hold all VFP registers contents on both aarch64 |
| 244 | and arm. */ |
| 245 | gdb_static_assert (sizeof regs >= VFP_REGS_SIZE); |
| 246 | |
| 247 | tid = ptid_get_lwp (inferior_ptid); |
| 248 | |
| 249 | iovec.iov_base = ®s; |
| 250 | |
| 251 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) |
| 252 | { |
| 253 | iovec.iov_len = VFP_REGS_SIZE; |
| 254 | |
| 255 | ret = ptrace (PTRACE_GETREGSET, tid, NT_ARM_VFP, &iovec); |
| 256 | if (ret < 0) |
| 257 | perror_with_name (_("Unable to fetch VFP registers.")); |
| 258 | |
| 259 | aarch32_vfp_regcache_supply (regcache, (gdb_byte *) ®s, 32); |
| 260 | } |
| 261 | else |
| 262 | { |
| 263 | int regno; |
| 264 | |
| 265 | iovec.iov_len = sizeof (regs); |
| 266 | |
| 267 | ret = ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iovec); |
| 268 | if (ret < 0) |
| 269 | perror_with_name (_("Unable to fetch vFP/SIMD registers.")); |
| 270 | |
| 271 | for (regno = AARCH64_V0_REGNUM; regno <= AARCH64_V31_REGNUM; regno++) |
| 272 | regcache_raw_supply (regcache, regno, |
| 273 | ®s.vregs[regno - AARCH64_V0_REGNUM]); |
| 274 | |
| 275 | regcache_raw_supply (regcache, AARCH64_FPSR_REGNUM, ®s.fpsr); |
| 276 | regcache_raw_supply (regcache, AARCH64_FPCR_REGNUM, ®s.fpcr); |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | /* Store to the current thread the valid fp/simd register |
| 281 | values in the GDB's register array. */ |
| 282 | |
| 283 | static void |
| 284 | store_fpregs_to_thread (const struct regcache *regcache) |
| 285 | { |
| 286 | int ret, tid; |
| 287 | elf_fpregset_t regs; |
| 288 | struct iovec iovec; |
| 289 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 290 | |
| 291 | /* Make sure REGS can hold all VFP registers contents on both aarch64 |
| 292 | and arm. */ |
| 293 | gdb_static_assert (sizeof regs >= VFP_REGS_SIZE); |
| 294 | tid = ptid_get_lwp (inferior_ptid); |
| 295 | |
| 296 | iovec.iov_base = ®s; |
| 297 | |
| 298 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) |
| 299 | { |
| 300 | iovec.iov_len = VFP_REGS_SIZE; |
| 301 | |
| 302 | ret = ptrace (PTRACE_GETREGSET, tid, NT_ARM_VFP, &iovec); |
| 303 | if (ret < 0) |
| 304 | perror_with_name (_("Unable to fetch VFP registers.")); |
| 305 | |
| 306 | aarch32_vfp_regcache_collect (regcache, (gdb_byte *) ®s, 32); |
| 307 | } |
| 308 | else |
| 309 | { |
| 310 | int regno; |
| 311 | |
| 312 | iovec.iov_len = sizeof (regs); |
| 313 | |
| 314 | ret = ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iovec); |
| 315 | if (ret < 0) |
| 316 | perror_with_name (_("Unable to fetch FP/SIMD registers.")); |
| 317 | |
| 318 | for (regno = AARCH64_V0_REGNUM; regno <= AARCH64_V31_REGNUM; regno++) |
| 319 | if (REG_VALID == regcache_register_status (regcache, regno)) |
| 320 | regcache_raw_collect (regcache, regno, |
| 321 | (char *) ®s.vregs[regno - AARCH64_V0_REGNUM]); |
| 322 | |
| 323 | if (REG_VALID == regcache_register_status (regcache, AARCH64_FPSR_REGNUM)) |
| 324 | regcache_raw_collect (regcache, AARCH64_FPSR_REGNUM, |
| 325 | (char *) ®s.fpsr); |
| 326 | if (REG_VALID == regcache_register_status (regcache, AARCH64_FPCR_REGNUM)) |
| 327 | regcache_raw_collect (regcache, AARCH64_FPCR_REGNUM, |
| 328 | (char *) ®s.fpcr); |
| 329 | } |
| 330 | |
| 331 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) |
| 332 | { |
| 333 | ret = ptrace (PTRACE_SETREGSET, tid, NT_ARM_VFP, &iovec); |
| 334 | if (ret < 0) |
| 335 | perror_with_name (_("Unable to store VFP registers.")); |
| 336 | } |
| 337 | else |
| 338 | { |
| 339 | ret = ptrace (PTRACE_SETREGSET, tid, NT_FPREGSET, &iovec); |
| 340 | if (ret < 0) |
| 341 | perror_with_name (_("Unable to store FP/SIMD registers.")); |
| 342 | } |
| 343 | } |
| 344 | |
| 345 | /* Implement the "to_fetch_register" target_ops method. */ |
| 346 | |
| 347 | static void |
| 348 | aarch64_linux_fetch_inferior_registers (struct target_ops *ops, |
| 349 | struct regcache *regcache, |
| 350 | int regno) |
| 351 | { |
| 352 | if (regno == -1) |
| 353 | { |
| 354 | fetch_gregs_from_thread (regcache); |
| 355 | fetch_fpregs_from_thread (regcache); |
| 356 | } |
| 357 | else if (regno < AARCH64_V0_REGNUM) |
| 358 | fetch_gregs_from_thread (regcache); |
| 359 | else |
| 360 | fetch_fpregs_from_thread (regcache); |
| 361 | } |
| 362 | |
| 363 | /* Implement the "to_store_register" target_ops method. */ |
| 364 | |
| 365 | static void |
| 366 | aarch64_linux_store_inferior_registers (struct target_ops *ops, |
| 367 | struct regcache *regcache, |
| 368 | int regno) |
| 369 | { |
| 370 | if (regno == -1) |
| 371 | { |
| 372 | store_gregs_to_thread (regcache); |
| 373 | store_fpregs_to_thread (regcache); |
| 374 | } |
| 375 | else if (regno < AARCH64_V0_REGNUM) |
| 376 | store_gregs_to_thread (regcache); |
| 377 | else |
| 378 | store_fpregs_to_thread (regcache); |
| 379 | } |
| 380 | |
| 381 | /* Fill register REGNO (if it is a general-purpose register) in |
| 382 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, |
| 383 | do this for all registers. */ |
| 384 | |
| 385 | void |
| 386 | fill_gregset (const struct regcache *regcache, |
| 387 | gdb_gregset_t *gregsetp, int regno) |
| 388 | { |
| 389 | regcache_collect_regset (&aarch64_linux_gregset, regcache, |
| 390 | regno, (gdb_byte *) gregsetp, |
| 391 | AARCH64_LINUX_SIZEOF_GREGSET); |
| 392 | } |
| 393 | |
| 394 | /* Fill GDB's register array with the general-purpose register values |
| 395 | in *GREGSETP. */ |
| 396 | |
| 397 | void |
| 398 | supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) |
| 399 | { |
| 400 | regcache_supply_regset (&aarch64_linux_gregset, regcache, -1, |
| 401 | (const gdb_byte *) gregsetp, |
| 402 | AARCH64_LINUX_SIZEOF_GREGSET); |
| 403 | } |
| 404 | |
| 405 | /* Fill register REGNO (if it is a floating-point register) in |
| 406 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, |
| 407 | do this for all registers. */ |
| 408 | |
| 409 | void |
| 410 | fill_fpregset (const struct regcache *regcache, |
| 411 | gdb_fpregset_t *fpregsetp, int regno) |
| 412 | { |
| 413 | regcache_collect_regset (&aarch64_linux_fpregset, regcache, |
| 414 | regno, (gdb_byte *) fpregsetp, |
| 415 | AARCH64_LINUX_SIZEOF_FPREGSET); |
| 416 | } |
| 417 | |
| 418 | /* Fill GDB's register array with the floating-point register values |
| 419 | in *FPREGSETP. */ |
| 420 | |
| 421 | void |
| 422 | supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp) |
| 423 | { |
| 424 | regcache_supply_regset (&aarch64_linux_fpregset, regcache, -1, |
| 425 | (const gdb_byte *) fpregsetp, |
| 426 | AARCH64_LINUX_SIZEOF_FPREGSET); |
| 427 | } |
| 428 | |
| 429 | /* linux_nat_new_fork hook. */ |
| 430 | |
| 431 | static void |
| 432 | aarch64_linux_new_fork (struct lwp_info *parent, pid_t child_pid) |
| 433 | { |
| 434 | pid_t parent_pid; |
| 435 | struct aarch64_debug_reg_state *parent_state; |
| 436 | struct aarch64_debug_reg_state *child_state; |
| 437 | |
| 438 | /* NULL means no watchpoint has ever been set in the parent. In |
| 439 | that case, there's nothing to do. */ |
| 440 | if (parent->arch_private == NULL) |
| 441 | return; |
| 442 | |
| 443 | /* GDB core assumes the child inherits the watchpoints/hw |
| 444 | breakpoints of the parent, and will remove them all from the |
| 445 | forked off process. Copy the debug registers mirrors into the |
| 446 | new process so that all breakpoints and watchpoints can be |
| 447 | removed together. */ |
| 448 | |
| 449 | parent_pid = ptid_get_pid (parent->ptid); |
| 450 | parent_state = aarch64_get_debug_reg_state (parent_pid); |
| 451 | child_state = aarch64_get_debug_reg_state (child_pid); |
| 452 | *child_state = *parent_state; |
| 453 | } |
| 454 | \f |
| 455 | |
| 456 | /* Called by libthread_db. Returns a pointer to the thread local |
| 457 | storage (or its descriptor). */ |
| 458 | |
| 459 | ps_err_e |
| 460 | ps_get_thread_area (const struct ps_prochandle *ph, |
| 461 | lwpid_t lwpid, int idx, void **base) |
| 462 | { |
| 463 | int is_64bit_p |
| 464 | = (gdbarch_bfd_arch_info (target_gdbarch ())->bits_per_word == 64); |
| 465 | |
| 466 | return aarch64_ps_get_thread_area (ph, lwpid, idx, base, is_64bit_p); |
| 467 | } |
| 468 | \f |
| 469 | |
| 470 | static void (*super_post_startup_inferior) (struct target_ops *self, |
| 471 | ptid_t ptid); |
| 472 | |
| 473 | /* Implement the "to_post_startup_inferior" target_ops method. */ |
| 474 | |
| 475 | static void |
| 476 | aarch64_linux_child_post_startup_inferior (struct target_ops *self, |
| 477 | ptid_t ptid) |
| 478 | { |
| 479 | aarch64_forget_process (ptid_get_pid (ptid)); |
| 480 | aarch64_linux_get_debug_reg_capacity (ptid_get_pid (ptid)); |
| 481 | super_post_startup_inferior (self, ptid); |
| 482 | } |
| 483 | |
| 484 | extern struct target_desc *tdesc_arm_with_vfpv3; |
| 485 | extern struct target_desc *tdesc_arm_with_neon; |
| 486 | |
| 487 | /* Implement the "to_read_description" target_ops method. */ |
| 488 | |
| 489 | static const struct target_desc * |
| 490 | aarch64_linux_read_description (struct target_ops *ops) |
| 491 | { |
| 492 | CORE_ADDR at_phent; |
| 493 | |
| 494 | if (target_auxv_search (ops, AT_PHENT, &at_phent) == 1) |
| 495 | { |
| 496 | if (at_phent == sizeof (Elf64_External_Phdr)) |
| 497 | return tdesc_aarch64; |
| 498 | else |
| 499 | { |
| 500 | CORE_ADDR arm_hwcap = 0; |
| 501 | |
| 502 | if (target_auxv_search (ops, AT_HWCAP, &arm_hwcap) != 1) |
| 503 | return ops->beneath->to_read_description (ops->beneath); |
| 504 | |
| 505 | #ifndef COMPAT_HWCAP_VFP |
| 506 | #define COMPAT_HWCAP_VFP (1 << 6) |
| 507 | #endif |
| 508 | #ifndef COMPAT_HWCAP_NEON |
| 509 | #define COMPAT_HWCAP_NEON (1 << 12) |
| 510 | #endif |
| 511 | #ifndef COMPAT_HWCAP_VFPv3 |
| 512 | #define COMPAT_HWCAP_VFPv3 (1 << 13) |
| 513 | #endif |
| 514 | |
| 515 | if (arm_hwcap & COMPAT_HWCAP_VFP) |
| 516 | { |
| 517 | char *buf; |
| 518 | const struct target_desc *result = NULL; |
| 519 | |
| 520 | if (arm_hwcap & COMPAT_HWCAP_NEON) |
| 521 | result = tdesc_arm_with_neon; |
| 522 | else if (arm_hwcap & COMPAT_HWCAP_VFPv3) |
| 523 | result = tdesc_arm_with_vfpv3; |
| 524 | |
| 525 | return result; |
| 526 | } |
| 527 | |
| 528 | return NULL; |
| 529 | } |
| 530 | } |
| 531 | |
| 532 | return tdesc_aarch64; |
| 533 | } |
| 534 | |
| 535 | /* Convert a native/host siginfo object, into/from the siginfo in the |
| 536 | layout of the inferiors' architecture. Returns true if any |
| 537 | conversion was done; false otherwise. If DIRECTION is 1, then copy |
| 538 | from INF to NATIVE. If DIRECTION is 0, copy from NATIVE to |
| 539 | INF. */ |
| 540 | |
| 541 | static int |
| 542 | aarch64_linux_siginfo_fixup (siginfo_t *native, gdb_byte *inf, int direction) |
| 543 | { |
| 544 | struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); |
| 545 | |
| 546 | /* Is the inferior 32-bit? If so, then do fixup the siginfo |
| 547 | object. */ |
| 548 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) |
| 549 | { |
| 550 | if (direction == 0) |
| 551 | aarch64_compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, |
| 552 | native); |
| 553 | else |
| 554 | aarch64_siginfo_from_compat_siginfo (native, |
| 555 | (struct compat_siginfo *) inf); |
| 556 | |
| 557 | return 1; |
| 558 | } |
| 559 | |
| 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | /* Returns the number of hardware watchpoints of type TYPE that we can |
| 564 | set. Value is positive if we can set CNT watchpoints, zero if |
| 565 | setting watchpoints of type TYPE is not supported, and negative if |
| 566 | CNT is more than the maximum number of watchpoints of type TYPE |
| 567 | that we can support. TYPE is one of bp_hardware_watchpoint, |
| 568 | bp_read_watchpoint, bp_write_watchpoint, or bp_hardware_breakpoint. |
| 569 | CNT is the number of such watchpoints used so far (including this |
| 570 | one). OTHERTYPE is non-zero if other types of watchpoints are |
| 571 | currently enabled. */ |
| 572 | |
| 573 | static int |
| 574 | aarch64_linux_can_use_hw_breakpoint (struct target_ops *self, |
| 575 | enum bptype type, |
| 576 | int cnt, int othertype) |
| 577 | { |
| 578 | if (type == bp_hardware_watchpoint || type == bp_read_watchpoint |
| 579 | || type == bp_access_watchpoint || type == bp_watchpoint) |
| 580 | { |
| 581 | if (aarch64_num_wp_regs == 0) |
| 582 | return 0; |
| 583 | } |
| 584 | else if (type == bp_hardware_breakpoint) |
| 585 | { |
| 586 | if (aarch64_num_bp_regs == 0) |
| 587 | return 0; |
| 588 | } |
| 589 | else |
| 590 | gdb_assert_not_reached ("unexpected breakpoint type"); |
| 591 | |
| 592 | /* We always return 1 here because we don't have enough information |
| 593 | about possible overlap of addresses that they want to watch. As an |
| 594 | extreme example, consider the case where all the watchpoints watch |
| 595 | the same address and the same region length: then we can handle a |
| 596 | virtually unlimited number of watchpoints, due to debug register |
| 597 | sharing implemented via reference counts. */ |
| 598 | return 1; |
| 599 | } |
| 600 | |
| 601 | /* Insert a hardware-assisted breakpoint at BP_TGT->reqstd_address. |
| 602 | Return 0 on success, -1 on failure. */ |
| 603 | |
| 604 | static int |
| 605 | aarch64_linux_insert_hw_breakpoint (struct target_ops *self, |
| 606 | struct gdbarch *gdbarch, |
| 607 | struct bp_target_info *bp_tgt) |
| 608 | { |
| 609 | int ret; |
| 610 | CORE_ADDR addr = bp_tgt->placed_address = bp_tgt->reqstd_address; |
| 611 | int len; |
| 612 | const enum target_hw_bp_type type = hw_execute; |
| 613 | struct aarch64_debug_reg_state *state |
| 614 | = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); |
| 615 | |
| 616 | gdbarch_breakpoint_from_pc (gdbarch, &addr, &len); |
| 617 | |
| 618 | if (show_debug_regs) |
| 619 | fprintf_unfiltered |
| 620 | (gdb_stdlog, |
| 621 | "insert_hw_breakpoint on entry (addr=0x%08lx, len=%d))\n", |
| 622 | (unsigned long) addr, len); |
| 623 | |
| 624 | ret = aarch64_handle_breakpoint (type, addr, len, 1 /* is_insert */, state); |
| 625 | |
| 626 | if (show_debug_regs) |
| 627 | { |
| 628 | aarch64_show_debug_reg_state (state, |
| 629 | "insert_hw_breakpoint", addr, len, type); |
| 630 | } |
| 631 | |
| 632 | return ret; |
| 633 | } |
| 634 | |
| 635 | /* Remove a hardware-assisted breakpoint at BP_TGT->placed_address. |
| 636 | Return 0 on success, -1 on failure. */ |
| 637 | |
| 638 | static int |
| 639 | aarch64_linux_remove_hw_breakpoint (struct target_ops *self, |
| 640 | struct gdbarch *gdbarch, |
| 641 | struct bp_target_info *bp_tgt) |
| 642 | { |
| 643 | int ret; |
| 644 | CORE_ADDR addr = bp_tgt->placed_address; |
| 645 | int len = 4; |
| 646 | const enum target_hw_bp_type type = hw_execute; |
| 647 | struct aarch64_debug_reg_state *state |
| 648 | = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); |
| 649 | |
| 650 | gdbarch_breakpoint_from_pc (gdbarch, &addr, &len); |
| 651 | |
| 652 | if (show_debug_regs) |
| 653 | fprintf_unfiltered |
| 654 | (gdb_stdlog, "remove_hw_breakpoint on entry (addr=0x%08lx, len=%d))\n", |
| 655 | (unsigned long) addr, len); |
| 656 | |
| 657 | ret = aarch64_handle_breakpoint (type, addr, len, 0 /* is_insert */, state); |
| 658 | |
| 659 | if (show_debug_regs) |
| 660 | { |
| 661 | aarch64_show_debug_reg_state (state, |
| 662 | "remove_hw_watchpoint", addr, len, type); |
| 663 | } |
| 664 | |
| 665 | return ret; |
| 666 | } |
| 667 | |
| 668 | /* Implement the "to_insert_watchpoint" target_ops method. |
| 669 | |
| 670 | Insert a watchpoint to watch a memory region which starts at |
| 671 | address ADDR and whose length is LEN bytes. Watch memory accesses |
| 672 | of the type TYPE. Return 0 on success, -1 on failure. */ |
| 673 | |
| 674 | static int |
| 675 | aarch64_linux_insert_watchpoint (struct target_ops *self, |
| 676 | CORE_ADDR addr, int len, |
| 677 | enum target_hw_bp_type type, |
| 678 | struct expression *cond) |
| 679 | { |
| 680 | int ret; |
| 681 | struct aarch64_debug_reg_state *state |
| 682 | = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); |
| 683 | |
| 684 | if (show_debug_regs) |
| 685 | fprintf_unfiltered (gdb_stdlog, |
| 686 | "insert_watchpoint on entry (addr=0x%08lx, len=%d)\n", |
| 687 | (unsigned long) addr, len); |
| 688 | |
| 689 | gdb_assert (type != hw_execute); |
| 690 | |
| 691 | ret = aarch64_handle_watchpoint (type, addr, len, 1 /* is_insert */, state); |
| 692 | |
| 693 | if (show_debug_regs) |
| 694 | { |
| 695 | aarch64_show_debug_reg_state (state, |
| 696 | "insert_watchpoint", addr, len, type); |
| 697 | } |
| 698 | |
| 699 | return ret; |
| 700 | } |
| 701 | |
| 702 | /* Implement the "to_remove_watchpoint" target_ops method. |
| 703 | Remove a watchpoint that watched the memory region which starts at |
| 704 | address ADDR, whose length is LEN bytes, and for accesses of the |
| 705 | type TYPE. Return 0 on success, -1 on failure. */ |
| 706 | |
| 707 | static int |
| 708 | aarch64_linux_remove_watchpoint (struct target_ops *self, |
| 709 | CORE_ADDR addr, int len, |
| 710 | enum target_hw_bp_type type, |
| 711 | struct expression *cond) |
| 712 | { |
| 713 | int ret; |
| 714 | struct aarch64_debug_reg_state *state |
| 715 | = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); |
| 716 | |
| 717 | if (show_debug_regs) |
| 718 | fprintf_unfiltered (gdb_stdlog, |
| 719 | "remove_watchpoint on entry (addr=0x%08lx, len=%d)\n", |
| 720 | (unsigned long) addr, len); |
| 721 | |
| 722 | gdb_assert (type != hw_execute); |
| 723 | |
| 724 | ret = aarch64_handle_watchpoint (type, addr, len, 0 /* is_insert */, state); |
| 725 | |
| 726 | if (show_debug_regs) |
| 727 | { |
| 728 | aarch64_show_debug_reg_state (state, |
| 729 | "remove_watchpoint", addr, len, type); |
| 730 | } |
| 731 | |
| 732 | return ret; |
| 733 | } |
| 734 | |
| 735 | /* Implement the "to_region_ok_for_hw_watchpoint" target_ops method. */ |
| 736 | |
| 737 | static int |
| 738 | aarch64_linux_region_ok_for_hw_watchpoint (struct target_ops *self, |
| 739 | CORE_ADDR addr, int len) |
| 740 | { |
| 741 | return aarch64_linux_region_ok_for_watchpoint (addr, len); |
| 742 | } |
| 743 | |
| 744 | /* Implement the "to_stopped_data_address" target_ops method. */ |
| 745 | |
| 746 | static int |
| 747 | aarch64_linux_stopped_data_address (struct target_ops *target, |
| 748 | CORE_ADDR *addr_p) |
| 749 | { |
| 750 | siginfo_t siginfo; |
| 751 | int i, tid; |
| 752 | struct aarch64_debug_reg_state *state; |
| 753 | |
| 754 | if (!linux_nat_get_siginfo (inferior_ptid, &siginfo)) |
| 755 | return 0; |
| 756 | |
| 757 | /* This must be a hardware breakpoint. */ |
| 758 | if (siginfo.si_signo != SIGTRAP |
| 759 | || (siginfo.si_code & 0xffff) != TRAP_HWBKPT) |
| 760 | return 0; |
| 761 | |
| 762 | /* Check if the address matches any watched address. */ |
| 763 | state = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); |
| 764 | for (i = aarch64_num_wp_regs - 1; i >= 0; --i) |
| 765 | { |
| 766 | const unsigned int len = aarch64_watchpoint_length (state->dr_ctrl_wp[i]); |
| 767 | const CORE_ADDR addr_trap = (CORE_ADDR) siginfo.si_addr; |
| 768 | const CORE_ADDR addr_watch = state->dr_addr_wp[i]; |
| 769 | |
| 770 | if (state->dr_ref_count_wp[i] |
| 771 | && DR_CONTROL_ENABLED (state->dr_ctrl_wp[i]) |
| 772 | && addr_trap >= addr_watch |
| 773 | && addr_trap < addr_watch + len) |
| 774 | { |
| 775 | *addr_p = addr_trap; |
| 776 | return 1; |
| 777 | } |
| 778 | } |
| 779 | |
| 780 | return 0; |
| 781 | } |
| 782 | |
| 783 | /* Implement the "to_stopped_by_watchpoint" target_ops method. */ |
| 784 | |
| 785 | static int |
| 786 | aarch64_linux_stopped_by_watchpoint (struct target_ops *ops) |
| 787 | { |
| 788 | CORE_ADDR addr; |
| 789 | |
| 790 | return aarch64_linux_stopped_data_address (ops, &addr); |
| 791 | } |
| 792 | |
| 793 | /* Implement the "to_watchpoint_addr_within_range" target_ops method. */ |
| 794 | |
| 795 | static int |
| 796 | aarch64_linux_watchpoint_addr_within_range (struct target_ops *target, |
| 797 | CORE_ADDR addr, |
| 798 | CORE_ADDR start, int length) |
| 799 | { |
| 800 | return start <= addr && start + length - 1 >= addr; |
| 801 | } |
| 802 | |
| 803 | /* Implement the "to_can_do_single_step" target_ops method. */ |
| 804 | |
| 805 | static int |
| 806 | aarch64_linux_can_do_single_step (struct target_ops *target) |
| 807 | { |
| 808 | return 1; |
| 809 | } |
| 810 | |
| 811 | /* Define AArch64 maintenance commands. */ |
| 812 | |
| 813 | static void |
| 814 | add_show_debug_regs_command (void) |
| 815 | { |
| 816 | /* A maintenance command to enable printing the internal DRi mirror |
| 817 | variables. */ |
| 818 | add_setshow_boolean_cmd ("show-debug-regs", class_maintenance, |
| 819 | &show_debug_regs, _("\ |
| 820 | Set whether to show variables that mirror the AArch64 debug registers."), _("\ |
| 821 | Show whether to show variables that mirror the AArch64 debug registers."), _("\ |
| 822 | Use \"on\" to enable, \"off\" to disable.\n\ |
| 823 | If enabled, the debug registers values are shown when GDB inserts\n\ |
| 824 | or removes a hardware breakpoint or watchpoint, and when the inferior\n\ |
| 825 | triggers a breakpoint or watchpoint."), |
| 826 | NULL, |
| 827 | NULL, |
| 828 | &maintenance_set_cmdlist, |
| 829 | &maintenance_show_cmdlist); |
| 830 | } |
| 831 | |
| 832 | /* -Wmissing-prototypes. */ |
| 833 | void _initialize_aarch64_linux_nat (void); |
| 834 | |
| 835 | void |
| 836 | _initialize_aarch64_linux_nat (void) |
| 837 | { |
| 838 | struct target_ops *t; |
| 839 | |
| 840 | /* Fill in the generic GNU/Linux methods. */ |
| 841 | t = linux_target (); |
| 842 | |
| 843 | add_show_debug_regs_command (); |
| 844 | |
| 845 | /* Add our register access methods. */ |
| 846 | t->to_fetch_registers = aarch64_linux_fetch_inferior_registers; |
| 847 | t->to_store_registers = aarch64_linux_store_inferior_registers; |
| 848 | |
| 849 | t->to_read_description = aarch64_linux_read_description; |
| 850 | |
| 851 | t->to_can_use_hw_breakpoint = aarch64_linux_can_use_hw_breakpoint; |
| 852 | t->to_insert_hw_breakpoint = aarch64_linux_insert_hw_breakpoint; |
| 853 | t->to_remove_hw_breakpoint = aarch64_linux_remove_hw_breakpoint; |
| 854 | t->to_region_ok_for_hw_watchpoint = |
| 855 | aarch64_linux_region_ok_for_hw_watchpoint; |
| 856 | t->to_insert_watchpoint = aarch64_linux_insert_watchpoint; |
| 857 | t->to_remove_watchpoint = aarch64_linux_remove_watchpoint; |
| 858 | t->to_stopped_by_watchpoint = aarch64_linux_stopped_by_watchpoint; |
| 859 | t->to_stopped_data_address = aarch64_linux_stopped_data_address; |
| 860 | t->to_watchpoint_addr_within_range = |
| 861 | aarch64_linux_watchpoint_addr_within_range; |
| 862 | t->to_can_do_single_step = aarch64_linux_can_do_single_step; |
| 863 | |
| 864 | /* Override the GNU/Linux inferior startup hook. */ |
| 865 | super_post_startup_inferior = t->to_post_startup_inferior; |
| 866 | t->to_post_startup_inferior = aarch64_linux_child_post_startup_inferior; |
| 867 | |
| 868 | /* Register the target. */ |
| 869 | linux_nat_add_target (t); |
| 870 | linux_nat_set_new_thread (t, aarch64_linux_new_thread); |
| 871 | linux_nat_set_new_fork (t, aarch64_linux_new_fork); |
| 872 | linux_nat_set_forget_process (t, aarch64_forget_process); |
| 873 | linux_nat_set_prepare_to_resume (t, aarch64_linux_prepare_to_resume); |
| 874 | |
| 875 | /* Add our siginfo layout converter. */ |
| 876 | linux_nat_set_siginfo_fixup (t, aarch64_linux_siginfo_fixup); |
| 877 | } |