| 1 | /* Target-dependent code for GNU/Linux i386. |
| 2 | |
| 3 | Copyright (C) 2000-2019 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "gdbcore.h" |
| 22 | #include "frame.h" |
| 23 | #include "value.h" |
| 24 | #include "regcache.h" |
| 25 | #include "regset.h" |
| 26 | #include "inferior.h" |
| 27 | #include "osabi.h" |
| 28 | #include "reggroups.h" |
| 29 | #include "dwarf2-frame.h" |
| 30 | #include "i386-tdep.h" |
| 31 | #include "i386-linux-tdep.h" |
| 32 | #include "linux-tdep.h" |
| 33 | #include "utils.h" |
| 34 | #include "glibc-tdep.h" |
| 35 | #include "solib-svr4.h" |
| 36 | #include "symtab.h" |
| 37 | #include "arch-utils.h" |
| 38 | #include "xml-syscall.h" |
| 39 | |
| 40 | #include "i387-tdep.h" |
| 41 | #include "gdbsupport/x86-xstate.h" |
| 42 | |
| 43 | /* The syscall's XML filename for i386. */ |
| 44 | #define XML_SYSCALL_FILENAME_I386 "syscalls/i386-linux.xml" |
| 45 | |
| 46 | #include "record-full.h" |
| 47 | #include "linux-record.h" |
| 48 | |
| 49 | #include "arch/i386.h" |
| 50 | #include "target-descriptions.h" |
| 51 | |
| 52 | /* Return non-zero, when the register is in the corresponding register |
| 53 | group. Put the LINUX_ORIG_EAX register in the system group. */ |
| 54 | static int |
| 55 | i386_linux_register_reggroup_p (struct gdbarch *gdbarch, int regnum, |
| 56 | struct reggroup *group) |
| 57 | { |
| 58 | if (regnum == I386_LINUX_ORIG_EAX_REGNUM) |
| 59 | return (group == system_reggroup |
| 60 | || group == save_reggroup |
| 61 | || group == restore_reggroup); |
| 62 | return i386_register_reggroup_p (gdbarch, regnum, group); |
| 63 | } |
| 64 | |
| 65 | \f |
| 66 | /* Recognizing signal handler frames. */ |
| 67 | |
| 68 | /* GNU/Linux has two flavors of signals. Normal signal handlers, and |
| 69 | "realtime" (RT) signals. The RT signals can provide additional |
| 70 | information to the signal handler if the SA_SIGINFO flag is set |
| 71 | when establishing a signal handler using `sigaction'. It is not |
| 72 | unlikely that future versions of GNU/Linux will support SA_SIGINFO |
| 73 | for normal signals too. */ |
| 74 | |
| 75 | /* When the i386 Linux kernel calls a signal handler and the |
| 76 | SA_RESTORER flag isn't set, the return address points to a bit of |
| 77 | code on the stack. This function returns whether the PC appears to |
| 78 | be within this bit of code. |
| 79 | |
| 80 | The instruction sequence for normal signals is |
| 81 | pop %eax |
| 82 | mov $0x77, %eax |
| 83 | int $0x80 |
| 84 | or 0x58 0xb8 0x77 0x00 0x00 0x00 0xcd 0x80. |
| 85 | |
| 86 | Checking for the code sequence should be somewhat reliable, because |
| 87 | the effect is to call the system call sigreturn. This is unlikely |
| 88 | to occur anywhere other than in a signal trampoline. |
| 89 | |
| 90 | It kind of sucks that we have to read memory from the process in |
| 91 | order to identify a signal trampoline, but there doesn't seem to be |
| 92 | any other way. Therefore we only do the memory reads if no |
| 93 | function name could be identified, which should be the case since |
| 94 | the code is on the stack. |
| 95 | |
| 96 | Detection of signal trampolines for handlers that set the |
| 97 | SA_RESTORER flag is in general not possible. Unfortunately this is |
| 98 | what the GNU C Library has been doing for quite some time now. |
| 99 | However, as of version 2.1.2, the GNU C Library uses signal |
| 100 | trampolines (named __restore and __restore_rt) that are identical |
| 101 | to the ones used by the kernel. Therefore, these trampolines are |
| 102 | supported too. */ |
| 103 | |
| 104 | #define LINUX_SIGTRAMP_INSN0 0x58 /* pop %eax */ |
| 105 | #define LINUX_SIGTRAMP_OFFSET0 0 |
| 106 | #define LINUX_SIGTRAMP_INSN1 0xb8 /* mov $NNNN, %eax */ |
| 107 | #define LINUX_SIGTRAMP_OFFSET1 1 |
| 108 | #define LINUX_SIGTRAMP_INSN2 0xcd /* int */ |
| 109 | #define LINUX_SIGTRAMP_OFFSET2 6 |
| 110 | |
| 111 | static const gdb_byte linux_sigtramp_code[] = |
| 112 | { |
| 113 | LINUX_SIGTRAMP_INSN0, /* pop %eax */ |
| 114 | LINUX_SIGTRAMP_INSN1, 0x77, 0x00, 0x00, 0x00, /* mov $0x77, %eax */ |
| 115 | LINUX_SIGTRAMP_INSN2, 0x80 /* int $0x80 */ |
| 116 | }; |
| 117 | |
| 118 | #define LINUX_SIGTRAMP_LEN (sizeof linux_sigtramp_code) |
| 119 | |
| 120 | /* If THIS_FRAME is a sigtramp routine, return the address of the |
| 121 | start of the routine. Otherwise, return 0. */ |
| 122 | |
| 123 | static CORE_ADDR |
| 124 | i386_linux_sigtramp_start (struct frame_info *this_frame) |
| 125 | { |
| 126 | CORE_ADDR pc = get_frame_pc (this_frame); |
| 127 | gdb_byte buf[LINUX_SIGTRAMP_LEN]; |
| 128 | |
| 129 | /* We only recognize a signal trampoline if PC is at the start of |
| 130 | one of the three instructions. We optimize for finding the PC at |
| 131 | the start, as will be the case when the trampoline is not the |
| 132 | first frame on the stack. We assume that in the case where the |
| 133 | PC is not at the start of the instruction sequence, there will be |
| 134 | a few trailing readable bytes on the stack. */ |
| 135 | |
| 136 | if (!safe_frame_unwind_memory (this_frame, pc, buf, LINUX_SIGTRAMP_LEN)) |
| 137 | return 0; |
| 138 | |
| 139 | if (buf[0] != LINUX_SIGTRAMP_INSN0) |
| 140 | { |
| 141 | int adjust; |
| 142 | |
| 143 | switch (buf[0]) |
| 144 | { |
| 145 | case LINUX_SIGTRAMP_INSN1: |
| 146 | adjust = LINUX_SIGTRAMP_OFFSET1; |
| 147 | break; |
| 148 | case LINUX_SIGTRAMP_INSN2: |
| 149 | adjust = LINUX_SIGTRAMP_OFFSET2; |
| 150 | break; |
| 151 | default: |
| 152 | return 0; |
| 153 | } |
| 154 | |
| 155 | pc -= adjust; |
| 156 | |
| 157 | if (!safe_frame_unwind_memory (this_frame, pc, buf, LINUX_SIGTRAMP_LEN)) |
| 158 | return 0; |
| 159 | } |
| 160 | |
| 161 | if (memcmp (buf, linux_sigtramp_code, LINUX_SIGTRAMP_LEN) != 0) |
| 162 | return 0; |
| 163 | |
| 164 | return pc; |
| 165 | } |
| 166 | |
| 167 | /* This function does the same for RT signals. Here the instruction |
| 168 | sequence is |
| 169 | mov $0xad, %eax |
| 170 | int $0x80 |
| 171 | or 0xb8 0xad 0x00 0x00 0x00 0xcd 0x80. |
| 172 | |
| 173 | The effect is to call the system call rt_sigreturn. */ |
| 174 | |
| 175 | #define LINUX_RT_SIGTRAMP_INSN0 0xb8 /* mov $NNNN, %eax */ |
| 176 | #define LINUX_RT_SIGTRAMP_OFFSET0 0 |
| 177 | #define LINUX_RT_SIGTRAMP_INSN1 0xcd /* int */ |
| 178 | #define LINUX_RT_SIGTRAMP_OFFSET1 5 |
| 179 | |
| 180 | static const gdb_byte linux_rt_sigtramp_code[] = |
| 181 | { |
| 182 | LINUX_RT_SIGTRAMP_INSN0, 0xad, 0x00, 0x00, 0x00, /* mov $0xad, %eax */ |
| 183 | LINUX_RT_SIGTRAMP_INSN1, 0x80 /* int $0x80 */ |
| 184 | }; |
| 185 | |
| 186 | #define LINUX_RT_SIGTRAMP_LEN (sizeof linux_rt_sigtramp_code) |
| 187 | |
| 188 | /* If THIS_FRAME is an RT sigtramp routine, return the address of the |
| 189 | start of the routine. Otherwise, return 0. */ |
| 190 | |
| 191 | static CORE_ADDR |
| 192 | i386_linux_rt_sigtramp_start (struct frame_info *this_frame) |
| 193 | { |
| 194 | CORE_ADDR pc = get_frame_pc (this_frame); |
| 195 | gdb_byte buf[LINUX_RT_SIGTRAMP_LEN]; |
| 196 | |
| 197 | /* We only recognize a signal trampoline if PC is at the start of |
| 198 | one of the two instructions. We optimize for finding the PC at |
| 199 | the start, as will be the case when the trampoline is not the |
| 200 | first frame on the stack. We assume that in the case where the |
| 201 | PC is not at the start of the instruction sequence, there will be |
| 202 | a few trailing readable bytes on the stack. */ |
| 203 | |
| 204 | if (!safe_frame_unwind_memory (this_frame, pc, buf, LINUX_RT_SIGTRAMP_LEN)) |
| 205 | return 0; |
| 206 | |
| 207 | if (buf[0] != LINUX_RT_SIGTRAMP_INSN0) |
| 208 | { |
| 209 | if (buf[0] != LINUX_RT_SIGTRAMP_INSN1) |
| 210 | return 0; |
| 211 | |
| 212 | pc -= LINUX_RT_SIGTRAMP_OFFSET1; |
| 213 | |
| 214 | if (!safe_frame_unwind_memory (this_frame, pc, buf, |
| 215 | LINUX_RT_SIGTRAMP_LEN)) |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | if (memcmp (buf, linux_rt_sigtramp_code, LINUX_RT_SIGTRAMP_LEN) != 0) |
| 220 | return 0; |
| 221 | |
| 222 | return pc; |
| 223 | } |
| 224 | |
| 225 | /* Return whether THIS_FRAME corresponds to a GNU/Linux sigtramp |
| 226 | routine. */ |
| 227 | |
| 228 | static int |
| 229 | i386_linux_sigtramp_p (struct frame_info *this_frame) |
| 230 | { |
| 231 | CORE_ADDR pc = get_frame_pc (this_frame); |
| 232 | const char *name; |
| 233 | |
| 234 | find_pc_partial_function (pc, &name, NULL, NULL); |
| 235 | |
| 236 | /* If we have NAME, we can optimize the search. The trampolines are |
| 237 | named __restore and __restore_rt. However, they aren't dynamically |
| 238 | exported from the shared C library, so the trampoline may appear to |
| 239 | be part of the preceding function. This should always be sigaction, |
| 240 | __sigaction, or __libc_sigaction (all aliases to the same function). */ |
| 241 | if (name == NULL || strstr (name, "sigaction") != NULL) |
| 242 | return (i386_linux_sigtramp_start (this_frame) != 0 |
| 243 | || i386_linux_rt_sigtramp_start (this_frame) != 0); |
| 244 | |
| 245 | return (strcmp ("__restore", name) == 0 |
| 246 | || strcmp ("__restore_rt", name) == 0); |
| 247 | } |
| 248 | |
| 249 | /* Return one if the PC of THIS_FRAME is in a signal trampoline which |
| 250 | may have DWARF-2 CFI. */ |
| 251 | |
| 252 | static int |
| 253 | i386_linux_dwarf_signal_frame_p (struct gdbarch *gdbarch, |
| 254 | struct frame_info *this_frame) |
| 255 | { |
| 256 | CORE_ADDR pc = get_frame_pc (this_frame); |
| 257 | const char *name; |
| 258 | |
| 259 | find_pc_partial_function (pc, &name, NULL, NULL); |
| 260 | |
| 261 | /* If a vsyscall DSO is in use, the signal trampolines may have these |
| 262 | names. */ |
| 263 | if (name && (strcmp (name, "__kernel_sigreturn") == 0 |
| 264 | || strcmp (name, "__kernel_rt_sigreturn") == 0)) |
| 265 | return 1; |
| 266 | |
| 267 | return 0; |
| 268 | } |
| 269 | |
| 270 | /* Offset to struct sigcontext in ucontext, from <asm/ucontext.h>. */ |
| 271 | #define I386_LINUX_UCONTEXT_SIGCONTEXT_OFFSET 20 |
| 272 | |
| 273 | /* Assuming THIS_FRAME is a GNU/Linux sigtramp routine, return the |
| 274 | address of the associated sigcontext structure. */ |
| 275 | |
| 276 | static CORE_ADDR |
| 277 | i386_linux_sigcontext_addr (struct frame_info *this_frame) |
| 278 | { |
| 279 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 280 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 281 | CORE_ADDR pc; |
| 282 | CORE_ADDR sp; |
| 283 | gdb_byte buf[4]; |
| 284 | |
| 285 | get_frame_register (this_frame, I386_ESP_REGNUM, buf); |
| 286 | sp = extract_unsigned_integer (buf, 4, byte_order); |
| 287 | |
| 288 | pc = i386_linux_sigtramp_start (this_frame); |
| 289 | if (pc) |
| 290 | { |
| 291 | /* The sigcontext structure lives on the stack, right after |
| 292 | the signum argument. We determine the address of the |
| 293 | sigcontext structure by looking at the frame's stack |
| 294 | pointer. Keep in mind that the first instruction of the |
| 295 | sigtramp code is "pop %eax". If the PC is after this |
| 296 | instruction, adjust the returned value accordingly. */ |
| 297 | if (pc == get_frame_pc (this_frame)) |
| 298 | return sp + 4; |
| 299 | return sp; |
| 300 | } |
| 301 | |
| 302 | pc = i386_linux_rt_sigtramp_start (this_frame); |
| 303 | if (pc) |
| 304 | { |
| 305 | CORE_ADDR ucontext_addr; |
| 306 | |
| 307 | /* The sigcontext structure is part of the user context. A |
| 308 | pointer to the user context is passed as the third argument |
| 309 | to the signal handler. */ |
| 310 | read_memory (sp + 8, buf, 4); |
| 311 | ucontext_addr = extract_unsigned_integer (buf, 4, byte_order); |
| 312 | return ucontext_addr + I386_LINUX_UCONTEXT_SIGCONTEXT_OFFSET; |
| 313 | } |
| 314 | |
| 315 | error (_("Couldn't recognize signal trampoline.")); |
| 316 | return 0; |
| 317 | } |
| 318 | |
| 319 | /* Set the program counter for process PTID to PC. */ |
| 320 | |
| 321 | static void |
| 322 | i386_linux_write_pc (struct regcache *regcache, CORE_ADDR pc) |
| 323 | { |
| 324 | regcache_cooked_write_unsigned (regcache, I386_EIP_REGNUM, pc); |
| 325 | |
| 326 | /* We must be careful with modifying the program counter. If we |
| 327 | just interrupted a system call, the kernel might try to restart |
| 328 | it when we resume the inferior. On restarting the system call, |
| 329 | the kernel will try backing up the program counter even though it |
| 330 | no longer points at the system call. This typically results in a |
| 331 | SIGSEGV or SIGILL. We can prevent this by writing `-1' in the |
| 332 | "orig_eax" pseudo-register. |
| 333 | |
| 334 | Note that "orig_eax" is saved when setting up a dummy call frame. |
| 335 | This means that it is properly restored when that frame is |
| 336 | popped, and that the interrupted system call will be restarted |
| 337 | when we resume the inferior on return from a function call from |
| 338 | within GDB. In all other cases the system call will not be |
| 339 | restarted. */ |
| 340 | regcache_cooked_write_unsigned (regcache, I386_LINUX_ORIG_EAX_REGNUM, -1); |
| 341 | } |
| 342 | |
| 343 | /* Record all registers but IP register for process-record. */ |
| 344 | |
| 345 | static int |
| 346 | i386_all_but_ip_registers_record (struct regcache *regcache) |
| 347 | { |
| 348 | if (record_full_arch_list_add_reg (regcache, I386_EAX_REGNUM)) |
| 349 | return -1; |
| 350 | if (record_full_arch_list_add_reg (regcache, I386_ECX_REGNUM)) |
| 351 | return -1; |
| 352 | if (record_full_arch_list_add_reg (regcache, I386_EDX_REGNUM)) |
| 353 | return -1; |
| 354 | if (record_full_arch_list_add_reg (regcache, I386_EBX_REGNUM)) |
| 355 | return -1; |
| 356 | if (record_full_arch_list_add_reg (regcache, I386_ESP_REGNUM)) |
| 357 | return -1; |
| 358 | if (record_full_arch_list_add_reg (regcache, I386_EBP_REGNUM)) |
| 359 | return -1; |
| 360 | if (record_full_arch_list_add_reg (regcache, I386_ESI_REGNUM)) |
| 361 | return -1; |
| 362 | if (record_full_arch_list_add_reg (regcache, I386_EDI_REGNUM)) |
| 363 | return -1; |
| 364 | if (record_full_arch_list_add_reg (regcache, I386_EFLAGS_REGNUM)) |
| 365 | return -1; |
| 366 | |
| 367 | return 0; |
| 368 | } |
| 369 | |
| 370 | /* i386_canonicalize_syscall maps from the native i386 Linux set |
| 371 | of syscall ids into a canonical set of syscall ids used by |
| 372 | process record (a mostly trivial mapping, since the canonical |
| 373 | set was originally taken from the i386 set). */ |
| 374 | |
| 375 | static enum gdb_syscall |
| 376 | i386_canonicalize_syscall (int syscall) |
| 377 | { |
| 378 | enum { i386_syscall_max = 499 }; |
| 379 | |
| 380 | if (syscall <= i386_syscall_max) |
| 381 | return (enum gdb_syscall) syscall; |
| 382 | else |
| 383 | return gdb_sys_no_syscall; |
| 384 | } |
| 385 | |
| 386 | /* Value of the sigcode in case of a boundary fault. */ |
| 387 | |
| 388 | #define SIG_CODE_BONDARY_FAULT 3 |
| 389 | |
| 390 | /* i386 GNU/Linux implementation of the handle_segmentation_fault |
| 391 | gdbarch hook. Displays information related to MPX bound |
| 392 | violations. */ |
| 393 | void |
| 394 | i386_linux_handle_segmentation_fault (struct gdbarch *gdbarch, |
| 395 | struct ui_out *uiout) |
| 396 | { |
| 397 | /* -Wmaybe-uninitialized */ |
| 398 | CORE_ADDR lower_bound = 0, upper_bound = 0, access = 0; |
| 399 | int is_upper; |
| 400 | long sig_code = 0; |
| 401 | |
| 402 | if (!i386_mpx_enabled ()) |
| 403 | return; |
| 404 | |
| 405 | try |
| 406 | { |
| 407 | /* Sigcode evaluates if the actual segfault is a boundary violation. */ |
| 408 | sig_code = parse_and_eval_long ("$_siginfo.si_code\n"); |
| 409 | |
| 410 | lower_bound |
| 411 | = parse_and_eval_long ("$_siginfo._sifields._sigfault._addr_bnd._lower"); |
| 412 | upper_bound |
| 413 | = parse_and_eval_long ("$_siginfo._sifields._sigfault._addr_bnd._upper"); |
| 414 | access |
| 415 | = parse_and_eval_long ("$_siginfo._sifields._sigfault.si_addr"); |
| 416 | } |
| 417 | catch (const gdb_exception &exception) |
| 418 | { |
| 419 | return; |
| 420 | } |
| 421 | |
| 422 | /* If this is not a boundary violation just return. */ |
| 423 | if (sig_code != SIG_CODE_BONDARY_FAULT) |
| 424 | return; |
| 425 | |
| 426 | is_upper = (access > upper_bound ? 1 : 0); |
| 427 | |
| 428 | uiout->text ("\n"); |
| 429 | if (is_upper) |
| 430 | uiout->field_string ("sigcode-meaning", _("Upper bound violation")); |
| 431 | else |
| 432 | uiout->field_string ("sigcode-meaning", _("Lower bound violation")); |
| 433 | |
| 434 | uiout->text (_(" while accessing address ")); |
| 435 | uiout->field_core_addr ("bound-access", gdbarch, access); |
| 436 | |
| 437 | uiout->text (_("\nBounds: [lower = ")); |
| 438 | uiout->field_core_addr ("lower-bound", gdbarch, lower_bound); |
| 439 | |
| 440 | uiout->text (_(", upper = ")); |
| 441 | uiout->field_core_addr ("upper-bound", gdbarch, upper_bound); |
| 442 | |
| 443 | uiout->text (_("]")); |
| 444 | } |
| 445 | |
| 446 | /* Parse the arguments of current system call instruction and record |
| 447 | the values of the registers and memory that will be changed into |
| 448 | "record_arch_list". This instruction is "int 0x80" (Linux |
| 449 | Kernel2.4) or "sysenter" (Linux Kernel 2.6). |
| 450 | |
| 451 | Return -1 if something wrong. */ |
| 452 | |
| 453 | static struct linux_record_tdep i386_linux_record_tdep; |
| 454 | |
| 455 | static int |
| 456 | i386_linux_intx80_sysenter_syscall_record (struct regcache *regcache) |
| 457 | { |
| 458 | int ret; |
| 459 | LONGEST syscall_native; |
| 460 | enum gdb_syscall syscall_gdb; |
| 461 | |
| 462 | regcache_raw_read_signed (regcache, I386_EAX_REGNUM, &syscall_native); |
| 463 | |
| 464 | syscall_gdb = i386_canonicalize_syscall (syscall_native); |
| 465 | |
| 466 | if (syscall_gdb < 0) |
| 467 | { |
| 468 | printf_unfiltered (_("Process record and replay target doesn't " |
| 469 | "support syscall number %s\n"), |
| 470 | plongest (syscall_native)); |
| 471 | return -1; |
| 472 | } |
| 473 | |
| 474 | if (syscall_gdb == gdb_sys_sigreturn |
| 475 | || syscall_gdb == gdb_sys_rt_sigreturn) |
| 476 | { |
| 477 | if (i386_all_but_ip_registers_record (regcache)) |
| 478 | return -1; |
| 479 | return 0; |
| 480 | } |
| 481 | |
| 482 | ret = record_linux_system_call (syscall_gdb, regcache, |
| 483 | &i386_linux_record_tdep); |
| 484 | if (ret) |
| 485 | return ret; |
| 486 | |
| 487 | /* Record the return value of the system call. */ |
| 488 | if (record_full_arch_list_add_reg (regcache, I386_EAX_REGNUM)) |
| 489 | return -1; |
| 490 | |
| 491 | return 0; |
| 492 | } |
| 493 | |
| 494 | #define I386_LINUX_xstate 270 |
| 495 | #define I386_LINUX_frame_size 732 |
| 496 | |
| 497 | static int |
| 498 | i386_linux_record_signal (struct gdbarch *gdbarch, |
| 499 | struct regcache *regcache, |
| 500 | enum gdb_signal signal) |
| 501 | { |
| 502 | ULONGEST esp; |
| 503 | |
| 504 | if (i386_all_but_ip_registers_record (regcache)) |
| 505 | return -1; |
| 506 | |
| 507 | if (record_full_arch_list_add_reg (regcache, I386_EIP_REGNUM)) |
| 508 | return -1; |
| 509 | |
| 510 | /* Record the change in the stack. */ |
| 511 | regcache_raw_read_unsigned (regcache, I386_ESP_REGNUM, &esp); |
| 512 | /* This is for xstate. |
| 513 | sp -= sizeof (struct _fpstate); */ |
| 514 | esp -= I386_LINUX_xstate; |
| 515 | /* This is for frame_size. |
| 516 | sp -= sizeof (struct rt_sigframe); */ |
| 517 | esp -= I386_LINUX_frame_size; |
| 518 | if (record_full_arch_list_add_mem (esp, |
| 519 | I386_LINUX_xstate + I386_LINUX_frame_size)) |
| 520 | return -1; |
| 521 | |
| 522 | if (record_full_arch_list_add_end ()) |
| 523 | return -1; |
| 524 | |
| 525 | return 0; |
| 526 | } |
| 527 | \f |
| 528 | |
| 529 | /* Core of the implementation for gdbarch get_syscall_number. Get pending |
| 530 | syscall number from REGCACHE. If there is no pending syscall -1 will be |
| 531 | returned. Pending syscall means ptrace has stepped into the syscall but |
| 532 | another ptrace call will step out. PC is right after the int $0x80 |
| 533 | / syscall / sysenter instruction in both cases, PC does not change during |
| 534 | the second ptrace step. */ |
| 535 | |
| 536 | static LONGEST |
| 537 | i386_linux_get_syscall_number_from_regcache (struct regcache *regcache) |
| 538 | { |
| 539 | struct gdbarch *gdbarch = regcache->arch (); |
| 540 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 541 | /* The content of a register. */ |
| 542 | gdb_byte buf[4]; |
| 543 | /* The result. */ |
| 544 | LONGEST ret; |
| 545 | |
| 546 | /* Getting the system call number from the register. |
| 547 | When dealing with x86 architecture, this information |
| 548 | is stored at %eax register. */ |
| 549 | regcache->cooked_read (I386_LINUX_ORIG_EAX_REGNUM, buf); |
| 550 | |
| 551 | ret = extract_signed_integer (buf, 4, byte_order); |
| 552 | |
| 553 | return ret; |
| 554 | } |
| 555 | |
| 556 | /* Wrapper for i386_linux_get_syscall_number_from_regcache to make it |
| 557 | compatible with gdbarch get_syscall_number method prototype. */ |
| 558 | |
| 559 | static LONGEST |
| 560 | i386_linux_get_syscall_number (struct gdbarch *gdbarch, |
| 561 | thread_info *thread) |
| 562 | { |
| 563 | struct regcache *regcache = get_thread_regcache (thread); |
| 564 | |
| 565 | return i386_linux_get_syscall_number_from_regcache (regcache); |
| 566 | } |
| 567 | |
| 568 | /* The register sets used in GNU/Linux ELF core-dumps are identical to |
| 569 | the register sets in `struct user' that are used for a.out |
| 570 | core-dumps. These are also used by ptrace(2). The corresponding |
| 571 | types are `elf_gregset_t' for the general-purpose registers (with |
| 572 | `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' |
| 573 | for the floating-point registers. |
| 574 | |
| 575 | Those types used to be available under the names `gregset_t' and |
| 576 | `fpregset_t' too, and GDB used those names in the past. But those |
| 577 | names are now used for the register sets used in the `mcontext_t' |
| 578 | type, which have a different size and layout. */ |
| 579 | |
| 580 | /* Mapping between the general-purpose registers in `struct user' |
| 581 | format and GDB's register cache layout. */ |
| 582 | |
| 583 | /* From <sys/reg.h>. */ |
| 584 | int i386_linux_gregset_reg_offset[] = |
| 585 | { |
| 586 | 6 * 4, /* %eax */ |
| 587 | 1 * 4, /* %ecx */ |
| 588 | 2 * 4, /* %edx */ |
| 589 | 0 * 4, /* %ebx */ |
| 590 | 15 * 4, /* %esp */ |
| 591 | 5 * 4, /* %ebp */ |
| 592 | 3 * 4, /* %esi */ |
| 593 | 4 * 4, /* %edi */ |
| 594 | 12 * 4, /* %eip */ |
| 595 | 14 * 4, /* %eflags */ |
| 596 | 13 * 4, /* %cs */ |
| 597 | 16 * 4, /* %ss */ |
| 598 | 7 * 4, /* %ds */ |
| 599 | 8 * 4, /* %es */ |
| 600 | 9 * 4, /* %fs */ |
| 601 | 10 * 4, /* %gs */ |
| 602 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 603 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 604 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 605 | -1, |
| 606 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 607 | -1, -1, -1, -1, /* MPX registers BND0 ... BND3. */ |
| 608 | -1, -1, /* MPX registers BNDCFGU, BNDSTATUS. */ |
| 609 | -1, -1, -1, -1, -1, -1, -1, -1, /* k0 ... k7 (AVX512) */ |
| 610 | -1, -1, -1, -1, -1, -1, -1, -1, /* zmm0 ... zmm7 (AVX512) */ |
| 611 | -1, /* PKRU register */ |
| 612 | 11 * 4, /* "orig_eax" */ |
| 613 | }; |
| 614 | |
| 615 | /* Mapping between the general-purpose registers in `struct |
| 616 | sigcontext' format and GDB's register cache layout. */ |
| 617 | |
| 618 | /* From <asm/sigcontext.h>. */ |
| 619 | static int i386_linux_sc_reg_offset[] = |
| 620 | { |
| 621 | 11 * 4, /* %eax */ |
| 622 | 10 * 4, /* %ecx */ |
| 623 | 9 * 4, /* %edx */ |
| 624 | 8 * 4, /* %ebx */ |
| 625 | 7 * 4, /* %esp */ |
| 626 | 6 * 4, /* %ebp */ |
| 627 | 5 * 4, /* %esi */ |
| 628 | 4 * 4, /* %edi */ |
| 629 | 14 * 4, /* %eip */ |
| 630 | 16 * 4, /* %eflags */ |
| 631 | 15 * 4, /* %cs */ |
| 632 | 18 * 4, /* %ss */ |
| 633 | 3 * 4, /* %ds */ |
| 634 | 2 * 4, /* %es */ |
| 635 | 1 * 4, /* %fs */ |
| 636 | 0 * 4 /* %gs */ |
| 637 | }; |
| 638 | |
| 639 | /* Get XSAVE extended state xcr0 from core dump. */ |
| 640 | |
| 641 | uint64_t |
| 642 | i386_linux_core_read_xcr0 (bfd *abfd) |
| 643 | { |
| 644 | asection *xstate = bfd_get_section_by_name (abfd, ".reg-xstate"); |
| 645 | uint64_t xcr0; |
| 646 | |
| 647 | if (xstate) |
| 648 | { |
| 649 | size_t size = bfd_section_size (xstate); |
| 650 | |
| 651 | /* Check extended state size. */ |
| 652 | if (size < X86_XSTATE_AVX_SIZE) |
| 653 | xcr0 = X86_XSTATE_SSE_MASK; |
| 654 | else |
| 655 | { |
| 656 | char contents[8]; |
| 657 | |
| 658 | if (! bfd_get_section_contents (abfd, xstate, contents, |
| 659 | I386_LINUX_XSAVE_XCR0_OFFSET, |
| 660 | 8)) |
| 661 | { |
| 662 | warning (_("Couldn't read `xcr0' bytes from " |
| 663 | "`.reg-xstate' section in core file.")); |
| 664 | return 0; |
| 665 | } |
| 666 | |
| 667 | xcr0 = bfd_get_64 (abfd, contents); |
| 668 | } |
| 669 | } |
| 670 | else |
| 671 | xcr0 = 0; |
| 672 | |
| 673 | return xcr0; |
| 674 | } |
| 675 | |
| 676 | /* See i386-linux-tdep.h. */ |
| 677 | |
| 678 | const struct target_desc * |
| 679 | i386_linux_read_description (uint64_t xcr0) |
| 680 | { |
| 681 | if (xcr0 == 0) |
| 682 | return NULL; |
| 683 | |
| 684 | static struct target_desc *i386_linux_tdescs \ |
| 685 | [2/*X87*/][2/*SSE*/][2/*AVX*/][2/*MPX*/][2/*AVX512*/][2/*PKRU*/] = {}; |
| 686 | struct target_desc **tdesc; |
| 687 | |
| 688 | tdesc = &i386_linux_tdescs[(xcr0 & X86_XSTATE_X87) ? 1 : 0] |
| 689 | [(xcr0 & X86_XSTATE_SSE) ? 1 : 0] |
| 690 | [(xcr0 & X86_XSTATE_AVX) ? 1 : 0] |
| 691 | [(xcr0 & X86_XSTATE_MPX) ? 1 : 0] |
| 692 | [(xcr0 & X86_XSTATE_AVX512) ? 1 : 0] |
| 693 | [(xcr0 & X86_XSTATE_PKRU) ? 1 : 0]; |
| 694 | |
| 695 | if (*tdesc == NULL) |
| 696 | *tdesc = i386_create_target_description (xcr0, true, false); |
| 697 | |
| 698 | return *tdesc; |
| 699 | } |
| 700 | |
| 701 | /* Get Linux/x86 target description from core dump. */ |
| 702 | |
| 703 | static const struct target_desc * |
| 704 | i386_linux_core_read_description (struct gdbarch *gdbarch, |
| 705 | struct target_ops *target, |
| 706 | bfd *abfd) |
| 707 | { |
| 708 | /* Linux/i386. */ |
| 709 | uint64_t xcr0 = i386_linux_core_read_xcr0 (abfd); |
| 710 | const struct target_desc *tdesc = i386_linux_read_description (xcr0); |
| 711 | |
| 712 | if (tdesc != NULL) |
| 713 | return tdesc; |
| 714 | |
| 715 | if (bfd_get_section_by_name (abfd, ".reg-xfp") != NULL) |
| 716 | return i386_linux_read_description (X86_XSTATE_SSE_MASK); |
| 717 | else |
| 718 | return i386_linux_read_description (X86_XSTATE_X87_MASK); |
| 719 | } |
| 720 | |
| 721 | /* Similar to i386_supply_fpregset, but use XSAVE extended state. */ |
| 722 | |
| 723 | static void |
| 724 | i386_linux_supply_xstateregset (const struct regset *regset, |
| 725 | struct regcache *regcache, int regnum, |
| 726 | const void *xstateregs, size_t len) |
| 727 | { |
| 728 | i387_supply_xsave (regcache, regnum, xstateregs); |
| 729 | } |
| 730 | |
| 731 | struct type * |
| 732 | x86_linux_get_siginfo_type (struct gdbarch *gdbarch) |
| 733 | { |
| 734 | return linux_get_siginfo_type_with_fields (gdbarch, LINUX_SIGINFO_FIELD_ADDR_BND); |
| 735 | } |
| 736 | |
| 737 | /* Similar to i386_collect_fpregset, but use XSAVE extended state. */ |
| 738 | |
| 739 | static void |
| 740 | i386_linux_collect_xstateregset (const struct regset *regset, |
| 741 | const struct regcache *regcache, |
| 742 | int regnum, void *xstateregs, size_t len) |
| 743 | { |
| 744 | i387_collect_xsave (regcache, regnum, xstateregs, 1); |
| 745 | } |
| 746 | |
| 747 | /* Register set definitions. */ |
| 748 | |
| 749 | static const struct regset i386_linux_xstateregset = |
| 750 | { |
| 751 | NULL, |
| 752 | i386_linux_supply_xstateregset, |
| 753 | i386_linux_collect_xstateregset |
| 754 | }; |
| 755 | |
| 756 | /* Iterate over core file register note sections. */ |
| 757 | |
| 758 | static void |
| 759 | i386_linux_iterate_over_regset_sections (struct gdbarch *gdbarch, |
| 760 | iterate_over_regset_sections_cb *cb, |
| 761 | void *cb_data, |
| 762 | const struct regcache *regcache) |
| 763 | { |
| 764 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 765 | |
| 766 | cb (".reg", 68, 68, &i386_gregset, NULL, cb_data); |
| 767 | |
| 768 | if (tdep->xcr0 & X86_XSTATE_AVX) |
| 769 | cb (".reg-xstate", X86_XSTATE_SIZE (tdep->xcr0), |
| 770 | X86_XSTATE_SIZE (tdep->xcr0), &i386_linux_xstateregset, |
| 771 | "XSAVE extended state", cb_data); |
| 772 | else if (tdep->xcr0 & X86_XSTATE_SSE) |
| 773 | cb (".reg-xfp", 512, 512, &i386_fpregset, "extended floating-point", |
| 774 | cb_data); |
| 775 | else |
| 776 | cb (".reg2", 108, 108, &i386_fpregset, NULL, cb_data); |
| 777 | } |
| 778 | |
| 779 | /* Linux kernel shows PC value after the 'int $0x80' instruction even if |
| 780 | inferior is still inside the syscall. On next PTRACE_SINGLESTEP it will |
| 781 | finish the syscall but PC will not change. |
| 782 | |
| 783 | Some vDSOs contain 'int $0x80; ret' and during stepping out of the syscall |
| 784 | i386_displaced_step_fixup would keep PC at the displaced pad location. |
| 785 | As PC is pointing to the 'ret' instruction before the step |
| 786 | i386_displaced_step_fixup would expect inferior has just executed that 'ret' |
| 787 | and PC should not be adjusted. In reality it finished syscall instead and |
| 788 | PC should get relocated back to its vDSO address. Hide the 'ret' |
| 789 | instruction by 'nop' so that i386_displaced_step_fixup is not confused. |
| 790 | |
| 791 | It is not fully correct as the bytes in struct displaced_step_closure will |
| 792 | not match the inferior code. But we would need some new flag in |
| 793 | displaced_step_closure otherwise to keep the state that syscall is finishing |
| 794 | for the later i386_displaced_step_fixup execution as the syscall execution |
| 795 | is already no longer detectable there. The new flag field would mean |
| 796 | i386-linux-tdep.c needs to wrap all the displacement methods of i386-tdep.c |
| 797 | which does not seem worth it. The same effect is achieved by patching that |
| 798 | 'nop' instruction there instead. */ |
| 799 | |
| 800 | static struct displaced_step_closure * |
| 801 | i386_linux_displaced_step_copy_insn (struct gdbarch *gdbarch, |
| 802 | CORE_ADDR from, CORE_ADDR to, |
| 803 | struct regcache *regs) |
| 804 | { |
| 805 | displaced_step_closure *closure_ |
| 806 | = i386_displaced_step_copy_insn (gdbarch, from, to, regs); |
| 807 | |
| 808 | if (i386_linux_get_syscall_number_from_regcache (regs) != -1) |
| 809 | { |
| 810 | /* The closure returned by i386_displaced_step_copy_insn is simply a |
| 811 | buffer with a copy of the instruction. */ |
| 812 | i386_displaced_step_closure *closure |
| 813 | = (i386_displaced_step_closure *) closure_; |
| 814 | |
| 815 | /* Fake nop. */ |
| 816 | closure->buf[0] = 0x90; |
| 817 | } |
| 818 | |
| 819 | return closure_; |
| 820 | } |
| 821 | |
| 822 | static void |
| 823 | i386_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 824 | { |
| 825 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 826 | const struct target_desc *tdesc = info.target_desc; |
| 827 | struct tdesc_arch_data *tdesc_data = info.tdesc_data; |
| 828 | const struct tdesc_feature *feature; |
| 829 | int valid_p; |
| 830 | |
| 831 | gdb_assert (tdesc_data); |
| 832 | |
| 833 | linux_init_abi (info, gdbarch); |
| 834 | |
| 835 | /* GNU/Linux uses ELF. */ |
| 836 | i386_elf_init_abi (info, gdbarch); |
| 837 | |
| 838 | /* Reserve a number for orig_eax. */ |
| 839 | set_gdbarch_num_regs (gdbarch, I386_LINUX_NUM_REGS); |
| 840 | |
| 841 | if (! tdesc_has_registers (tdesc)) |
| 842 | tdesc = i386_linux_read_description (X86_XSTATE_SSE_MASK); |
| 843 | tdep->tdesc = tdesc; |
| 844 | |
| 845 | feature = tdesc_find_feature (tdesc, "org.gnu.gdb.i386.linux"); |
| 846 | if (feature == NULL) |
| 847 | return; |
| 848 | |
| 849 | valid_p = tdesc_numbered_register (feature, tdesc_data, |
| 850 | I386_LINUX_ORIG_EAX_REGNUM, |
| 851 | "orig_eax"); |
| 852 | if (!valid_p) |
| 853 | return; |
| 854 | |
| 855 | /* Add the %orig_eax register used for syscall restarting. */ |
| 856 | set_gdbarch_write_pc (gdbarch, i386_linux_write_pc); |
| 857 | |
| 858 | tdep->register_reggroup_p = i386_linux_register_reggroup_p; |
| 859 | |
| 860 | tdep->gregset_reg_offset = i386_linux_gregset_reg_offset; |
| 861 | tdep->gregset_num_regs = ARRAY_SIZE (i386_linux_gregset_reg_offset); |
| 862 | tdep->sizeof_gregset = 17 * 4; |
| 863 | |
| 864 | tdep->jb_pc_offset = 20; /* From <bits/setjmp.h>. */ |
| 865 | |
| 866 | tdep->sigtramp_p = i386_linux_sigtramp_p; |
| 867 | tdep->sigcontext_addr = i386_linux_sigcontext_addr; |
| 868 | tdep->sc_reg_offset = i386_linux_sc_reg_offset; |
| 869 | tdep->sc_num_regs = ARRAY_SIZE (i386_linux_sc_reg_offset); |
| 870 | |
| 871 | tdep->xsave_xcr0_offset = I386_LINUX_XSAVE_XCR0_OFFSET; |
| 872 | |
| 873 | set_gdbarch_process_record (gdbarch, i386_process_record); |
| 874 | set_gdbarch_process_record_signal (gdbarch, i386_linux_record_signal); |
| 875 | |
| 876 | /* Initialize the i386_linux_record_tdep. */ |
| 877 | /* These values are the size of the type that will be used in a system |
| 878 | call. They are obtained from Linux Kernel source. */ |
| 879 | i386_linux_record_tdep.size_pointer |
| 880 | = gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; |
| 881 | i386_linux_record_tdep.size__old_kernel_stat = 32; |
| 882 | i386_linux_record_tdep.size_tms = 16; |
| 883 | i386_linux_record_tdep.size_loff_t = 8; |
| 884 | i386_linux_record_tdep.size_flock = 16; |
| 885 | i386_linux_record_tdep.size_oldold_utsname = 45; |
| 886 | i386_linux_record_tdep.size_ustat = 20; |
| 887 | i386_linux_record_tdep.size_old_sigaction = 16; |
| 888 | i386_linux_record_tdep.size_old_sigset_t = 4; |
| 889 | i386_linux_record_tdep.size_rlimit = 8; |
| 890 | i386_linux_record_tdep.size_rusage = 72; |
| 891 | i386_linux_record_tdep.size_timeval = 8; |
| 892 | i386_linux_record_tdep.size_timezone = 8; |
| 893 | i386_linux_record_tdep.size_old_gid_t = 2; |
| 894 | i386_linux_record_tdep.size_old_uid_t = 2; |
| 895 | i386_linux_record_tdep.size_fd_set = 128; |
| 896 | i386_linux_record_tdep.size_old_dirent = 268; |
| 897 | i386_linux_record_tdep.size_statfs = 64; |
| 898 | i386_linux_record_tdep.size_statfs64 = 84; |
| 899 | i386_linux_record_tdep.size_sockaddr = 16; |
| 900 | i386_linux_record_tdep.size_int |
| 901 | = gdbarch_int_bit (gdbarch) / TARGET_CHAR_BIT; |
| 902 | i386_linux_record_tdep.size_long |
| 903 | = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT; |
| 904 | i386_linux_record_tdep.size_ulong |
| 905 | = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT; |
| 906 | i386_linux_record_tdep.size_msghdr = 28; |
| 907 | i386_linux_record_tdep.size_itimerval = 16; |
| 908 | i386_linux_record_tdep.size_stat = 88; |
| 909 | i386_linux_record_tdep.size_old_utsname = 325; |
| 910 | i386_linux_record_tdep.size_sysinfo = 64; |
| 911 | i386_linux_record_tdep.size_msqid_ds = 88; |
| 912 | i386_linux_record_tdep.size_shmid_ds = 84; |
| 913 | i386_linux_record_tdep.size_new_utsname = 390; |
| 914 | i386_linux_record_tdep.size_timex = 128; |
| 915 | i386_linux_record_tdep.size_mem_dqinfo = 24; |
| 916 | i386_linux_record_tdep.size_if_dqblk = 68; |
| 917 | i386_linux_record_tdep.size_fs_quota_stat = 68; |
| 918 | i386_linux_record_tdep.size_timespec = 8; |
| 919 | i386_linux_record_tdep.size_pollfd = 8; |
| 920 | i386_linux_record_tdep.size_NFS_FHSIZE = 32; |
| 921 | i386_linux_record_tdep.size_knfsd_fh = 132; |
| 922 | i386_linux_record_tdep.size_TASK_COMM_LEN = 16; |
| 923 | i386_linux_record_tdep.size_sigaction = 20; |
| 924 | i386_linux_record_tdep.size_sigset_t = 8; |
| 925 | i386_linux_record_tdep.size_siginfo_t = 128; |
| 926 | i386_linux_record_tdep.size_cap_user_data_t = 12; |
| 927 | i386_linux_record_tdep.size_stack_t = 12; |
| 928 | i386_linux_record_tdep.size_off_t = i386_linux_record_tdep.size_long; |
| 929 | i386_linux_record_tdep.size_stat64 = 96; |
| 930 | i386_linux_record_tdep.size_gid_t = 4; |
| 931 | i386_linux_record_tdep.size_uid_t = 4; |
| 932 | i386_linux_record_tdep.size_PAGE_SIZE = 4096; |
| 933 | i386_linux_record_tdep.size_flock64 = 24; |
| 934 | i386_linux_record_tdep.size_user_desc = 16; |
| 935 | i386_linux_record_tdep.size_io_event = 32; |
| 936 | i386_linux_record_tdep.size_iocb = 64; |
| 937 | i386_linux_record_tdep.size_epoll_event = 12; |
| 938 | i386_linux_record_tdep.size_itimerspec |
| 939 | = i386_linux_record_tdep.size_timespec * 2; |
| 940 | i386_linux_record_tdep.size_mq_attr = 32; |
| 941 | i386_linux_record_tdep.size_termios = 36; |
| 942 | i386_linux_record_tdep.size_termios2 = 44; |
| 943 | i386_linux_record_tdep.size_pid_t = 4; |
| 944 | i386_linux_record_tdep.size_winsize = 8; |
| 945 | i386_linux_record_tdep.size_serial_struct = 60; |
| 946 | i386_linux_record_tdep.size_serial_icounter_struct = 80; |
| 947 | i386_linux_record_tdep.size_hayes_esp_config = 12; |
| 948 | i386_linux_record_tdep.size_size_t = 4; |
| 949 | i386_linux_record_tdep.size_iovec = 8; |
| 950 | i386_linux_record_tdep.size_time_t = 4; |
| 951 | |
| 952 | /* These values are the second argument of system call "sys_ioctl". |
| 953 | They are obtained from Linux Kernel source. */ |
| 954 | i386_linux_record_tdep.ioctl_TCGETS = 0x5401; |
| 955 | i386_linux_record_tdep.ioctl_TCSETS = 0x5402; |
| 956 | i386_linux_record_tdep.ioctl_TCSETSW = 0x5403; |
| 957 | i386_linux_record_tdep.ioctl_TCSETSF = 0x5404; |
| 958 | i386_linux_record_tdep.ioctl_TCGETA = 0x5405; |
| 959 | i386_linux_record_tdep.ioctl_TCSETA = 0x5406; |
| 960 | i386_linux_record_tdep.ioctl_TCSETAW = 0x5407; |
| 961 | i386_linux_record_tdep.ioctl_TCSETAF = 0x5408; |
| 962 | i386_linux_record_tdep.ioctl_TCSBRK = 0x5409; |
| 963 | i386_linux_record_tdep.ioctl_TCXONC = 0x540A; |
| 964 | i386_linux_record_tdep.ioctl_TCFLSH = 0x540B; |
| 965 | i386_linux_record_tdep.ioctl_TIOCEXCL = 0x540C; |
| 966 | i386_linux_record_tdep.ioctl_TIOCNXCL = 0x540D; |
| 967 | i386_linux_record_tdep.ioctl_TIOCSCTTY = 0x540E; |
| 968 | i386_linux_record_tdep.ioctl_TIOCGPGRP = 0x540F; |
| 969 | i386_linux_record_tdep.ioctl_TIOCSPGRP = 0x5410; |
| 970 | i386_linux_record_tdep.ioctl_TIOCOUTQ = 0x5411; |
| 971 | i386_linux_record_tdep.ioctl_TIOCSTI = 0x5412; |
| 972 | i386_linux_record_tdep.ioctl_TIOCGWINSZ = 0x5413; |
| 973 | i386_linux_record_tdep.ioctl_TIOCSWINSZ = 0x5414; |
| 974 | i386_linux_record_tdep.ioctl_TIOCMGET = 0x5415; |
| 975 | i386_linux_record_tdep.ioctl_TIOCMBIS = 0x5416; |
| 976 | i386_linux_record_tdep.ioctl_TIOCMBIC = 0x5417; |
| 977 | i386_linux_record_tdep.ioctl_TIOCMSET = 0x5418; |
| 978 | i386_linux_record_tdep.ioctl_TIOCGSOFTCAR = 0x5419; |
| 979 | i386_linux_record_tdep.ioctl_TIOCSSOFTCAR = 0x541A; |
| 980 | i386_linux_record_tdep.ioctl_FIONREAD = 0x541B; |
| 981 | i386_linux_record_tdep.ioctl_TIOCINQ = i386_linux_record_tdep.ioctl_FIONREAD; |
| 982 | i386_linux_record_tdep.ioctl_TIOCLINUX = 0x541C; |
| 983 | i386_linux_record_tdep.ioctl_TIOCCONS = 0x541D; |
| 984 | i386_linux_record_tdep.ioctl_TIOCGSERIAL = 0x541E; |
| 985 | i386_linux_record_tdep.ioctl_TIOCSSERIAL = 0x541F; |
| 986 | i386_linux_record_tdep.ioctl_TIOCPKT = 0x5420; |
| 987 | i386_linux_record_tdep.ioctl_FIONBIO = 0x5421; |
| 988 | i386_linux_record_tdep.ioctl_TIOCNOTTY = 0x5422; |
| 989 | i386_linux_record_tdep.ioctl_TIOCSETD = 0x5423; |
| 990 | i386_linux_record_tdep.ioctl_TIOCGETD = 0x5424; |
| 991 | i386_linux_record_tdep.ioctl_TCSBRKP = 0x5425; |
| 992 | i386_linux_record_tdep.ioctl_TIOCTTYGSTRUCT = 0x5426; |
| 993 | i386_linux_record_tdep.ioctl_TIOCSBRK = 0x5427; |
| 994 | i386_linux_record_tdep.ioctl_TIOCCBRK = 0x5428; |
| 995 | i386_linux_record_tdep.ioctl_TIOCGSID = 0x5429; |
| 996 | i386_linux_record_tdep.ioctl_TCGETS2 = 0x802c542a; |
| 997 | i386_linux_record_tdep.ioctl_TCSETS2 = 0x402c542b; |
| 998 | i386_linux_record_tdep.ioctl_TCSETSW2 = 0x402c542c; |
| 999 | i386_linux_record_tdep.ioctl_TCSETSF2 = 0x402c542d; |
| 1000 | i386_linux_record_tdep.ioctl_TIOCGPTN = 0x80045430; |
| 1001 | i386_linux_record_tdep.ioctl_TIOCSPTLCK = 0x40045431; |
| 1002 | i386_linux_record_tdep.ioctl_FIONCLEX = 0x5450; |
| 1003 | i386_linux_record_tdep.ioctl_FIOCLEX = 0x5451; |
| 1004 | i386_linux_record_tdep.ioctl_FIOASYNC = 0x5452; |
| 1005 | i386_linux_record_tdep.ioctl_TIOCSERCONFIG = 0x5453; |
| 1006 | i386_linux_record_tdep.ioctl_TIOCSERGWILD = 0x5454; |
| 1007 | i386_linux_record_tdep.ioctl_TIOCSERSWILD = 0x5455; |
| 1008 | i386_linux_record_tdep.ioctl_TIOCGLCKTRMIOS = 0x5456; |
| 1009 | i386_linux_record_tdep.ioctl_TIOCSLCKTRMIOS = 0x5457; |
| 1010 | i386_linux_record_tdep.ioctl_TIOCSERGSTRUCT = 0x5458; |
| 1011 | i386_linux_record_tdep.ioctl_TIOCSERGETLSR = 0x5459; |
| 1012 | i386_linux_record_tdep.ioctl_TIOCSERGETMULTI = 0x545A; |
| 1013 | i386_linux_record_tdep.ioctl_TIOCSERSETMULTI = 0x545B; |
| 1014 | i386_linux_record_tdep.ioctl_TIOCMIWAIT = 0x545C; |
| 1015 | i386_linux_record_tdep.ioctl_TIOCGICOUNT = 0x545D; |
| 1016 | i386_linux_record_tdep.ioctl_TIOCGHAYESESP = 0x545E; |
| 1017 | i386_linux_record_tdep.ioctl_TIOCSHAYESESP = 0x545F; |
| 1018 | i386_linux_record_tdep.ioctl_FIOQSIZE = 0x5460; |
| 1019 | |
| 1020 | /* These values are the second argument of system call "sys_fcntl" |
| 1021 | and "sys_fcntl64". They are obtained from Linux Kernel source. */ |
| 1022 | i386_linux_record_tdep.fcntl_F_GETLK = 5; |
| 1023 | i386_linux_record_tdep.fcntl_F_GETLK64 = 12; |
| 1024 | i386_linux_record_tdep.fcntl_F_SETLK64 = 13; |
| 1025 | i386_linux_record_tdep.fcntl_F_SETLKW64 = 14; |
| 1026 | |
| 1027 | i386_linux_record_tdep.arg1 = I386_EBX_REGNUM; |
| 1028 | i386_linux_record_tdep.arg2 = I386_ECX_REGNUM; |
| 1029 | i386_linux_record_tdep.arg3 = I386_EDX_REGNUM; |
| 1030 | i386_linux_record_tdep.arg4 = I386_ESI_REGNUM; |
| 1031 | i386_linux_record_tdep.arg5 = I386_EDI_REGNUM; |
| 1032 | i386_linux_record_tdep.arg6 = I386_EBP_REGNUM; |
| 1033 | |
| 1034 | tdep->i386_intx80_record = i386_linux_intx80_sysenter_syscall_record; |
| 1035 | tdep->i386_sysenter_record = i386_linux_intx80_sysenter_syscall_record; |
| 1036 | tdep->i386_syscall_record = i386_linux_intx80_sysenter_syscall_record; |
| 1037 | |
| 1038 | /* N_FUN symbols in shared libraries have 0 for their values and need |
| 1039 | to be relocated. */ |
| 1040 | set_gdbarch_sofun_address_maybe_missing (gdbarch, 1); |
| 1041 | |
| 1042 | /* GNU/Linux uses SVR4-style shared libraries. */ |
| 1043 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
| 1044 | set_solib_svr4_fetch_link_map_offsets |
| 1045 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| 1046 | |
| 1047 | /* GNU/Linux uses the dynamic linker included in the GNU C Library. */ |
| 1048 | set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); |
| 1049 | |
| 1050 | dwarf2_frame_set_signal_frame_p (gdbarch, i386_linux_dwarf_signal_frame_p); |
| 1051 | |
| 1052 | /* Enable TLS support. */ |
| 1053 | set_gdbarch_fetch_tls_load_module_address (gdbarch, |
| 1054 | svr4_fetch_objfile_link_map); |
| 1055 | |
| 1056 | /* Core file support. */ |
| 1057 | set_gdbarch_iterate_over_regset_sections |
| 1058 | (gdbarch, i386_linux_iterate_over_regset_sections); |
| 1059 | set_gdbarch_core_read_description (gdbarch, |
| 1060 | i386_linux_core_read_description); |
| 1061 | |
| 1062 | /* Displaced stepping. */ |
| 1063 | set_gdbarch_displaced_step_copy_insn (gdbarch, |
| 1064 | i386_linux_displaced_step_copy_insn); |
| 1065 | set_gdbarch_displaced_step_fixup (gdbarch, i386_displaced_step_fixup); |
| 1066 | set_gdbarch_displaced_step_location (gdbarch, |
| 1067 | linux_displaced_step_location); |
| 1068 | |
| 1069 | /* Functions for 'catch syscall'. */ |
| 1070 | set_xml_syscall_file_name (gdbarch, XML_SYSCALL_FILENAME_I386); |
| 1071 | set_gdbarch_get_syscall_number (gdbarch, |
| 1072 | i386_linux_get_syscall_number); |
| 1073 | |
| 1074 | set_gdbarch_get_siginfo_type (gdbarch, x86_linux_get_siginfo_type); |
| 1075 | set_gdbarch_handle_segmentation_fault (gdbarch, |
| 1076 | i386_linux_handle_segmentation_fault); |
| 1077 | } |
| 1078 | |
| 1079 | void |
| 1080 | _initialize_i386_linux_tdep (void) |
| 1081 | { |
| 1082 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_LINUX, |
| 1083 | i386_linux_init_abi); |
| 1084 | } |