1 /* GNU/Linux on ARM target support. 2 3 Copyright (C) 1999-2023 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 "target.h" 22 #include "value.h" 23 #include "gdbtypes.h" 24 #include "gdbcore.h" 25 #include "frame.h" 26 #include "regcache.h" 27 #include "solib-svr4.h" 28 #include "osabi.h" 29 #include "regset.h" 30 #include "trad-frame.h" 31 #include "tramp-frame.h" 32 #include "breakpoint.h" 33 #include "auxv.h" 34 #include "xml-syscall.h" 35 #include "expop.h" 36 37 #include "aarch32-tdep.h" 38 #include "arch/arm.h" 39 #include "arch/arm-get-next-pcs.h" 40 #include "arch/arm-linux.h" 41 #include "arm-tdep.h" 42 #include "arm-linux-tdep.h" 43 #include "linux-tdep.h" 44 #include "glibc-tdep.h" 45 #include "arch-utils.h" 46 #include "inferior.h" 47 #include "infrun.h" 48 #include "gdbthread.h" 49 #include "symfile.h" 50 51 #include "record-full.h" 52 #include "linux-record.h" 53 54 #include "cli/cli-utils.h" 55 #include "stap-probe.h" 56 #include "parser-defs.h" 57 #include "user-regs.h" 58 #include <ctype.h> 59 #include "elf/common.h" 60 61 /* Under ARM GNU/Linux the traditional way of performing a breakpoint 62 is to execute a particular software interrupt, rather than use a 63 particular undefined instruction to provoke a trap. Upon exection 64 of the software interrupt the kernel stops the inferior with a 65 SIGTRAP, and wakes the debugger. */ 66 67 static const gdb_byte arm_linux_arm_le_breakpoint[] = { 0x01, 0x00, 0x9f, 0xef }; 68 69 static const gdb_byte arm_linux_arm_be_breakpoint[] = { 0xef, 0x9f, 0x00, 0x01 }; 70 71 /* However, the EABI syscall interface (new in Nov. 2005) does not look at 72 the operand of the swi if old-ABI compatibility is disabled. Therefore, 73 use an undefined instruction instead. This is supported as of kernel 74 version 2.5.70 (May 2003), so should be a safe assumption for EABI 75 binaries. */ 76 77 static const gdb_byte eabi_linux_arm_le_breakpoint[] = { 0xf0, 0x01, 0xf0, 0xe7 }; 78 79 static const gdb_byte eabi_linux_arm_be_breakpoint[] = { 0xe7, 0xf0, 0x01, 0xf0 }; 80 81 /* All the kernels which support Thumb support using a specific undefined 82 instruction for the Thumb breakpoint. */ 83 84 static const gdb_byte arm_linux_thumb_be_breakpoint[] = {0xde, 0x01}; 85 86 static const gdb_byte arm_linux_thumb_le_breakpoint[] = {0x01, 0xde}; 87 88 /* Because the 16-bit Thumb breakpoint is affected by Thumb-2 IT blocks, 89 we must use a length-appropriate breakpoint for 32-bit Thumb 90 instructions. See also thumb_get_next_pc. */ 91 92 static const gdb_byte arm_linux_thumb2_be_breakpoint[] = { 0xf7, 0xf0, 0xa0, 0x00 }; 93 94 static const gdb_byte arm_linux_thumb2_le_breakpoint[] = { 0xf0, 0xf7, 0x00, 0xa0 }; 95 96 /* Description of the longjmp buffer. The buffer is treated as an array of 97 elements of size ARM_LINUX_JB_ELEMENT_SIZE. 98 99 The location of saved registers in this buffer (in particular the PC 100 to use after longjmp is called) varies depending on the ABI (in 101 particular the FP model) and also (possibly) the C Library. 102 103 For glibc, eglibc, and uclibc the following holds: If the FP model is 104 SoftVFP or VFP (which implies EABI) then the PC is at offset 9 in the 105 buffer. This is also true for the SoftFPA model. However, for the FPA 106 model the PC is at offset 21 in the buffer. */ 107 #define ARM_LINUX_JB_ELEMENT_SIZE ARM_INT_REGISTER_SIZE 108 #define ARM_LINUX_JB_PC_FPA 21 109 #define ARM_LINUX_JB_PC_EABI 9 110 111 /* 112 Dynamic Linking on ARM GNU/Linux 113 -------------------------------- 114 115 Note: PLT = procedure linkage table 116 GOT = global offset table 117 118 As much as possible, ELF dynamic linking defers the resolution of 119 jump/call addresses until the last minute. The technique used is 120 inspired by the i386 ELF design, and is based on the following 121 constraints. 122 123 1) The calling technique should not force a change in the assembly 124 code produced for apps; it MAY cause changes in the way assembly 125 code is produced for position independent code (i.e. shared 126 libraries). 127 128 2) The technique must be such that all executable areas must not be 129 modified; and any modified areas must not be executed. 130 131 To do this, there are three steps involved in a typical jump: 132 133 1) in the code 134 2) through the PLT 135 3) using a pointer from the GOT 136 137 When the executable or library is first loaded, each GOT entry is 138 initialized to point to the code which implements dynamic name 139 resolution and code finding. This is normally a function in the 140 program interpreter (on ARM GNU/Linux this is usually 141 ld-linux.so.2, but it does not have to be). On the first 142 invocation, the function is located and the GOT entry is replaced 143 with the real function address. Subsequent calls go through steps 144 1, 2 and 3 and end up calling the real code. 145 146 1) In the code: 147 148 b function_call 149 bl function_call 150 151 This is typical ARM code using the 26 bit relative branch or branch 152 and link instructions. The target of the instruction 153 (function_call is usually the address of the function to be called. 154 In position independent code, the target of the instruction is 155 actually an entry in the PLT when calling functions in a shared 156 library. Note that this call is identical to a normal function 157 call, only the target differs. 158 159 2) In the PLT: 160 161 The PLT is a synthetic area, created by the linker. It exists in 162 both executables and libraries. It is an array of stubs, one per 163 imported function call. It looks like this: 164 165 PLT[0]: 166 str lr, [sp, #-4]! @push the return address (lr) 167 ldr lr, [pc, #16] @load from 6 words ahead 168 add lr, pc, lr @form an address for GOT[0] 169 ldr pc, [lr, #8]! @jump to the contents of that addr 170 171 The return address (lr) is pushed on the stack and used for 172 calculations. The load on the second line loads the lr with 173 &GOT[3] - . - 20. The addition on the third leaves: 174 175 lr = (&GOT[3] - . - 20) + (. + 8) 176 lr = (&GOT[3] - 12) 177 lr = &GOT[0] 178 179 On the fourth line, the pc and lr are both updated, so that: 180 181 pc = GOT[2] 182 lr = &GOT[0] + 8 183 = &GOT[2] 184 185 NOTE: PLT[0] borrows an offset .word from PLT[1]. This is a little 186 "tight", but allows us to keep all the PLT entries the same size. 187 188 PLT[n+1]: 189 ldr ip, [pc, #4] @load offset from gotoff 190 add ip, pc, ip @add the offset to the pc 191 ldr pc, [ip] @jump to that address 192 gotoff: .word GOT[n+3] - . 193 194 The load on the first line, gets an offset from the fourth word of 195 the PLT entry. The add on the second line makes ip = &GOT[n+3], 196 which contains either a pointer to PLT[0] (the fixup trampoline) or 197 a pointer to the actual code. 198 199 3) In the GOT: 200 201 The GOT contains helper pointers for both code (PLT) fixups and 202 data fixups. The first 3 entries of the GOT are special. The next 203 M entries (where M is the number of entries in the PLT) belong to 204 the PLT fixups. The next D (all remaining) entries belong to 205 various data fixups. The actual size of the GOT is 3 + M + D. 206 207 The GOT is also a synthetic area, created by the linker. It exists 208 in both executables and libraries. When the GOT is first 209 initialized , all the GOT entries relating to PLT fixups are 210 pointing to code back at PLT[0]. 211 212 The special entries in the GOT are: 213 214 GOT[0] = linked list pointer used by the dynamic loader 215 GOT[1] = pointer to the reloc table for this module 216 GOT[2] = pointer to the fixup/resolver code 217 218 The first invocation of function call comes through and uses the 219 fixup/resolver code. On the entry to the fixup/resolver code: 220 221 ip = &GOT[n+3] 222 lr = &GOT[2] 223 stack[0] = return address (lr) of the function call 224 [r0, r1, r2, r3] are still the arguments to the function call 225 226 This is enough information for the fixup/resolver code to work 227 with. Before the fixup/resolver code returns, it actually calls 228 the requested function and repairs &GOT[n+3]. */ 229 230 /* The constants below were determined by examining the following files 231 in the linux kernel sources: 232 233 arch/arm/kernel/signal.c 234 - see SWI_SYS_SIGRETURN and SWI_SYS_RT_SIGRETURN 235 include/asm-arm/unistd.h 236 - see __NR_sigreturn, __NR_rt_sigreturn, and __NR_SYSCALL_BASE */ 237 238 #define ARM_LINUX_SIGRETURN_INSTR 0xef900077 239 #define ARM_LINUX_RT_SIGRETURN_INSTR 0xef9000ad 240 241 /* For ARM EABI, the syscall number is not in the SWI instruction 242 (instead it is loaded into r7). We recognize the pattern that 243 glibc uses... alternatively, we could arrange to do this by 244 function name, but they are not always exported. */ 245 #define ARM_SET_R7_SIGRETURN 0xe3a07077 246 #define ARM_SET_R7_RT_SIGRETURN 0xe3a070ad 247 #define ARM_EABI_SYSCALL 0xef000000 248 249 /* Equivalent patterns for Thumb2. */ 250 #define THUMB2_SET_R7_SIGRETURN1 0xf04f 251 #define THUMB2_SET_R7_SIGRETURN2 0x0777 252 #define THUMB2_SET_R7_RT_SIGRETURN1 0xf04f 253 #define THUMB2_SET_R7_RT_SIGRETURN2 0x07ad 254 #define THUMB2_EABI_SYSCALL 0xdf00 255 256 /* OABI syscall restart trampoline, used for EABI executables too 257 whenever OABI support has been enabled in the kernel. */ 258 #define ARM_OABI_SYSCALL_RESTART_SYSCALL 0xef900000 259 #define ARM_LDR_PC_SP_12 0xe49df00c 260 #define ARM_LDR_PC_SP_4 0xe49df004 261 262 /* Syscall number for sigreturn. */ 263 #define ARM_SIGRETURN 119 264 /* Syscall number for rt_sigreturn. */ 265 #define ARM_RT_SIGRETURN 173 266 267 static CORE_ADDR 268 arm_linux_get_next_pcs_syscall_next_pc (struct arm_get_next_pcs *self); 269 270 /* Operation function pointers for get_next_pcs. */ 271 static struct arm_get_next_pcs_ops arm_linux_get_next_pcs_ops = { 272 arm_get_next_pcs_read_memory_unsigned_integer, 273 arm_linux_get_next_pcs_syscall_next_pc, 274 arm_get_next_pcs_addr_bits_remove, 275 arm_get_next_pcs_is_thumb, 276 arm_linux_get_next_pcs_fixup, 277 }; 278 279 static void 280 arm_linux_sigtramp_cache (frame_info_ptr this_frame, 281 struct trad_frame_cache *this_cache, 282 CORE_ADDR func, int regs_offset) 283 { 284 CORE_ADDR sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM); 285 CORE_ADDR base = sp + regs_offset; 286 int i; 287 288 for (i = 0; i < 16; i++) 289 trad_frame_set_reg_addr (this_cache, i, base + i * 4); 290 291 trad_frame_set_reg_addr (this_cache, ARM_PS_REGNUM, base + 16 * 4); 292 293 /* The VFP or iWMMXt registers may be saved on the stack, but there's 294 no reliable way to restore them (yet). */ 295 296 /* Save a frame ID. */ 297 trad_frame_set_id (this_cache, frame_id_build (sp, func)); 298 } 299 300 /* See arm-linux.h for stack layout details. */ 301 static void 302 arm_linux_sigreturn_init (const struct tramp_frame *self, 303 frame_info_ptr this_frame, 304 struct trad_frame_cache *this_cache, 305 CORE_ADDR func) 306 { 307 struct gdbarch *gdbarch = get_frame_arch (this_frame); 308 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); 309 CORE_ADDR sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM); 310 ULONGEST uc_flags = read_memory_unsigned_integer (sp, 4, byte_order); 311 312 if (uc_flags == ARM_NEW_SIGFRAME_MAGIC) 313 arm_linux_sigtramp_cache (this_frame, this_cache, func, 314 ARM_UCONTEXT_SIGCONTEXT 315 + ARM_SIGCONTEXT_R0); 316 else 317 arm_linux_sigtramp_cache (this_frame, this_cache, func, 318 ARM_SIGCONTEXT_R0); 319 } 320 321 static void 322 arm_linux_rt_sigreturn_init (const struct tramp_frame *self, 323 frame_info_ptr this_frame, 324 struct trad_frame_cache *this_cache, 325 CORE_ADDR func) 326 { 327 struct gdbarch *gdbarch = get_frame_arch (this_frame); 328 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); 329 CORE_ADDR sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM); 330 ULONGEST pinfo = read_memory_unsigned_integer (sp, 4, byte_order); 331 332 if (pinfo == sp + ARM_OLD_RT_SIGFRAME_SIGINFO) 333 arm_linux_sigtramp_cache (this_frame, this_cache, func, 334 ARM_OLD_RT_SIGFRAME_UCONTEXT 335 + ARM_UCONTEXT_SIGCONTEXT 336 + ARM_SIGCONTEXT_R0); 337 else 338 arm_linux_sigtramp_cache (this_frame, this_cache, func, 339 ARM_NEW_RT_SIGFRAME_UCONTEXT 340 + ARM_UCONTEXT_SIGCONTEXT 341 + ARM_SIGCONTEXT_R0); 342 } 343 344 static void 345 arm_linux_restart_syscall_init (const struct tramp_frame *self, 346 frame_info_ptr this_frame, 347 struct trad_frame_cache *this_cache, 348 CORE_ADDR func) 349 { 350 struct gdbarch *gdbarch = get_frame_arch (this_frame); 351 CORE_ADDR sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM); 352 CORE_ADDR pc = get_frame_memory_unsigned (this_frame, sp, 4); 353 CORE_ADDR cpsr = get_frame_register_unsigned (this_frame, ARM_PS_REGNUM); 354 ULONGEST t_bit = arm_psr_thumb_bit (gdbarch); 355 int sp_offset; 356 357 /* There are two variants of this trampoline; with older kernels, the 358 stub is placed on the stack, while newer kernels use the stub from 359 the vector page. They are identical except that the older version 360 increments SP by 12 (to skip stored PC and the stub itself), while 361 the newer version increments SP only by 4 (just the stored PC). */ 362 if (self->insn[1].bytes == ARM_LDR_PC_SP_4) 363 sp_offset = 4; 364 else 365 sp_offset = 12; 366 367 /* Update Thumb bit in CPSR. */ 368 if (pc & 1) 369 cpsr |= t_bit; 370 else 371 cpsr &= ~t_bit; 372 373 /* Remove Thumb bit from PC. */ 374 pc = gdbarch_addr_bits_remove (gdbarch, pc); 375 376 /* Save previous register values. */ 377 trad_frame_set_reg_value (this_cache, ARM_SP_REGNUM, sp + sp_offset); 378 trad_frame_set_reg_value (this_cache, ARM_PC_REGNUM, pc); 379 trad_frame_set_reg_value (this_cache, ARM_PS_REGNUM, cpsr); 380 381 /* Save a frame ID. */ 382 trad_frame_set_id (this_cache, frame_id_build (sp, func)); 383 } 384 385 static struct tramp_frame arm_linux_sigreturn_tramp_frame = { 386 SIGTRAMP_FRAME, 387 4, 388 { 389 { ARM_LINUX_SIGRETURN_INSTR, ULONGEST_MAX }, 390 { TRAMP_SENTINEL_INSN } 391 }, 392 arm_linux_sigreturn_init 393 }; 394 395 static struct tramp_frame arm_linux_rt_sigreturn_tramp_frame = { 396 SIGTRAMP_FRAME, 397 4, 398 { 399 { ARM_LINUX_RT_SIGRETURN_INSTR, ULONGEST_MAX }, 400 { TRAMP_SENTINEL_INSN } 401 }, 402 arm_linux_rt_sigreturn_init 403 }; 404 405 static struct tramp_frame arm_eabi_linux_sigreturn_tramp_frame = { 406 SIGTRAMP_FRAME, 407 4, 408 { 409 { ARM_SET_R7_SIGRETURN, ULONGEST_MAX }, 410 { ARM_EABI_SYSCALL, ULONGEST_MAX }, 411 { TRAMP_SENTINEL_INSN } 412 }, 413 arm_linux_sigreturn_init 414 }; 415 416 static struct tramp_frame arm_eabi_linux_rt_sigreturn_tramp_frame = { 417 SIGTRAMP_FRAME, 418 4, 419 { 420 { ARM_SET_R7_RT_SIGRETURN, ULONGEST_MAX }, 421 { ARM_EABI_SYSCALL, ULONGEST_MAX }, 422 { TRAMP_SENTINEL_INSN } 423 }, 424 arm_linux_rt_sigreturn_init 425 }; 426 427 static struct tramp_frame thumb2_eabi_linux_sigreturn_tramp_frame = { 428 SIGTRAMP_FRAME, 429 2, 430 { 431 { THUMB2_SET_R7_SIGRETURN1, ULONGEST_MAX }, 432 { THUMB2_SET_R7_SIGRETURN2, ULONGEST_MAX }, 433 { THUMB2_EABI_SYSCALL, ULONGEST_MAX }, 434 { TRAMP_SENTINEL_INSN } 435 }, 436 arm_linux_sigreturn_init 437 }; 438 439 static struct tramp_frame thumb2_eabi_linux_rt_sigreturn_tramp_frame = { 440 SIGTRAMP_FRAME, 441 2, 442 { 443 { THUMB2_SET_R7_RT_SIGRETURN1, ULONGEST_MAX }, 444 { THUMB2_SET_R7_RT_SIGRETURN2, ULONGEST_MAX }, 445 { THUMB2_EABI_SYSCALL, ULONGEST_MAX }, 446 { TRAMP_SENTINEL_INSN } 447 }, 448 arm_linux_rt_sigreturn_init 449 }; 450 451 static struct tramp_frame arm_linux_restart_syscall_tramp_frame = { 452 NORMAL_FRAME, 453 4, 454 { 455 { ARM_OABI_SYSCALL_RESTART_SYSCALL, ULONGEST_MAX }, 456 { ARM_LDR_PC_SP_12, ULONGEST_MAX }, 457 { TRAMP_SENTINEL_INSN } 458 }, 459 arm_linux_restart_syscall_init 460 }; 461 462 static struct tramp_frame arm_kernel_linux_restart_syscall_tramp_frame = { 463 NORMAL_FRAME, 464 4, 465 { 466 { ARM_OABI_SYSCALL_RESTART_SYSCALL, ULONGEST_MAX }, 467 { ARM_LDR_PC_SP_4, ULONGEST_MAX }, 468 { TRAMP_SENTINEL_INSN } 469 }, 470 arm_linux_restart_syscall_init 471 }; 472 473 /* Core file and register set support. */ 474 475 #define ARM_LINUX_SIZEOF_GREGSET (18 * ARM_INT_REGISTER_SIZE) 476 477 void 478 arm_linux_supply_gregset (const struct regset *regset, 479 struct regcache *regcache, 480 int regnum, const void *gregs_buf, size_t len) 481 { 482 struct gdbarch *gdbarch = regcache->arch (); 483 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); 484 const gdb_byte *gregs = (const gdb_byte *) gregs_buf; 485 int regno; 486 CORE_ADDR reg_pc; 487 gdb_byte pc_buf[ARM_INT_REGISTER_SIZE]; 488 489 for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++) 490 if (regnum == -1 || regnum == regno) 491 regcache->raw_supply (regno, gregs + ARM_INT_REGISTER_SIZE * regno); 492 493 if (regnum == ARM_PS_REGNUM || regnum == -1) 494 { 495 if (arm_apcs_32) 496 regcache->raw_supply (ARM_PS_REGNUM, 497 gregs + ARM_INT_REGISTER_SIZE * ARM_CPSR_GREGNUM); 498 else 499 regcache->raw_supply (ARM_PS_REGNUM, 500 gregs + ARM_INT_REGISTER_SIZE * ARM_PC_REGNUM); 501 } 502 503 if (regnum == ARM_PC_REGNUM || regnum == -1) 504 { 505 reg_pc = extract_unsigned_integer ( 506 gregs + ARM_INT_REGISTER_SIZE * ARM_PC_REGNUM, 507 ARM_INT_REGISTER_SIZE, byte_order); 508 reg_pc = gdbarch_addr_bits_remove (gdbarch, reg_pc); 509 store_unsigned_integer (pc_buf, ARM_INT_REGISTER_SIZE, byte_order, 510 reg_pc); 511 regcache->raw_supply (ARM_PC_REGNUM, pc_buf); 512 } 513 } 514 515 void 516 arm_linux_collect_gregset (const struct regset *regset, 517 const struct regcache *regcache, 518 int regnum, void *gregs_buf, size_t len) 519 { 520 gdb_byte *gregs = (gdb_byte *) gregs_buf; 521 int regno; 522 523 for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++) 524 if (regnum == -1 || regnum == regno) 525 regcache->raw_collect (regno, 526 gregs + ARM_INT_REGISTER_SIZE * regno); 527 528 if (regnum == ARM_PS_REGNUM || regnum == -1) 529 { 530 if (arm_apcs_32) 531 regcache->raw_collect (ARM_PS_REGNUM, 532 gregs + ARM_INT_REGISTER_SIZE * ARM_CPSR_GREGNUM); 533 else 534 regcache->raw_collect (ARM_PS_REGNUM, 535 gregs + ARM_INT_REGISTER_SIZE * ARM_PC_REGNUM); 536 } 537 538 if (regnum == ARM_PC_REGNUM || regnum == -1) 539 regcache->raw_collect (ARM_PC_REGNUM, 540 gregs + ARM_INT_REGISTER_SIZE * ARM_PC_REGNUM); 541 } 542 543 /* Support for register format used by the NWFPE FPA emulator. */ 544 545 #define typeNone 0x00 546 #define typeSingle 0x01 547 #define typeDouble 0x02 548 #define typeExtended 0x03 549 550 void 551 supply_nwfpe_register (struct regcache *regcache, int regno, 552 const gdb_byte *regs) 553 { 554 const gdb_byte *reg_data; 555 gdb_byte reg_tag; 556 gdb_byte buf[ARM_FP_REGISTER_SIZE]; 557 558 reg_data = regs + (regno - ARM_F0_REGNUM) * ARM_FP_REGISTER_SIZE; 559 reg_tag = regs[(regno - ARM_F0_REGNUM) + NWFPE_TAGS_OFFSET]; 560 memset (buf, 0, ARM_FP_REGISTER_SIZE); 561 562 switch (reg_tag) 563 { 564 case typeSingle: 565 memcpy (buf, reg_data, 4); 566 break; 567 case typeDouble: 568 memcpy (buf, reg_data + 4, 4); 569 memcpy (buf + 4, reg_data, 4); 570 break; 571 case typeExtended: 572 /* We want sign and exponent, then least significant bits, 573 then most significant. NWFPE does sign, most, least. */ 574 memcpy (buf, reg_data, 4); 575 memcpy (buf + 4, reg_data + 8, 4); 576 memcpy (buf + 8, reg_data + 4, 4); 577 break; 578 default: 579 break; 580 } 581 582 regcache->raw_supply (regno, buf); 583 } 584 585 void 586 collect_nwfpe_register (const struct regcache *regcache, int regno, 587 gdb_byte *regs) 588 { 589 gdb_byte *reg_data; 590 gdb_byte reg_tag; 591 gdb_byte buf[ARM_FP_REGISTER_SIZE]; 592 593 regcache->raw_collect (regno, buf); 594 595 /* NOTE drow/2006-06-07: This code uses the tag already in the 596 register buffer. I've preserved that when moving the code 597 from the native file to the target file. But this doesn't 598 always make sense. */ 599 600 reg_data = regs + (regno - ARM_F0_REGNUM) * ARM_FP_REGISTER_SIZE; 601 reg_tag = regs[(regno - ARM_F0_REGNUM) + NWFPE_TAGS_OFFSET]; 602 603 switch (reg_tag) 604 { 605 case typeSingle: 606 memcpy (reg_data, buf, 4); 607 break; 608 case typeDouble: 609 memcpy (reg_data, buf + 4, 4); 610 memcpy (reg_data + 4, buf, 4); 611 break; 612 case typeExtended: 613 memcpy (reg_data, buf, 4); 614 memcpy (reg_data + 4, buf + 8, 4); 615 memcpy (reg_data + 8, buf + 4, 4); 616 break; 617 default: 618 break; 619 } 620 } 621 622 void 623 arm_linux_supply_nwfpe (const struct regset *regset, 624 struct regcache *regcache, 625 int regnum, const void *regs_buf, size_t len) 626 { 627 const gdb_byte *regs = (const gdb_byte *) regs_buf; 628 int regno; 629 630 if (regnum == ARM_FPS_REGNUM || regnum == -1) 631 regcache->raw_supply (ARM_FPS_REGNUM, 632 regs + NWFPE_FPSR_OFFSET); 633 634 for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++) 635 if (regnum == -1 || regnum == regno) 636 supply_nwfpe_register (regcache, regno, regs); 637 } 638 639 void 640 arm_linux_collect_nwfpe (const struct regset *regset, 641 const struct regcache *regcache, 642 int regnum, void *regs_buf, size_t len) 643 { 644 gdb_byte *regs = (gdb_byte *) regs_buf; 645 int regno; 646 647 for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++) 648 if (regnum == -1 || regnum == regno) 649 collect_nwfpe_register (regcache, regno, regs); 650 651 if (regnum == ARM_FPS_REGNUM || regnum == -1) 652 regcache->raw_collect (ARM_FPS_REGNUM, 653 regs + ARM_INT_REGISTER_SIZE * ARM_FPS_REGNUM); 654 } 655 656 /* Support VFP register format. */ 657 658 #define ARM_LINUX_SIZEOF_VFP (32 * 8 + 4) 659 660 static void 661 arm_linux_supply_vfp (const struct regset *regset, 662 struct regcache *regcache, 663 int regnum, const void *regs_buf, size_t len) 664 { 665 const gdb_byte *regs = (const gdb_byte *) regs_buf; 666 int regno; 667 668 if (regnum == ARM_FPSCR_REGNUM || regnum == -1) 669 regcache->raw_supply (ARM_FPSCR_REGNUM, regs + 32 * 8); 670 671 for (regno = ARM_D0_REGNUM; regno <= ARM_D31_REGNUM; regno++) 672 if (regnum == -1 || regnum == regno) 673 regcache->raw_supply (regno, regs + (regno - ARM_D0_REGNUM) * 8); 674 } 675 676 static void 677 arm_linux_collect_vfp (const struct regset *regset, 678 const struct regcache *regcache, 679 int regnum, void *regs_buf, size_t len) 680 { 681 gdb_byte *regs = (gdb_byte *) regs_buf; 682 int regno; 683 684 if (regnum == ARM_FPSCR_REGNUM || regnum == -1) 685 regcache->raw_collect (ARM_FPSCR_REGNUM, regs + 32 * 8); 686 687 for (regno = ARM_D0_REGNUM; regno <= ARM_D31_REGNUM; regno++) 688 if (regnum == -1 || regnum == regno) 689 regcache->raw_collect (regno, regs + (regno - ARM_D0_REGNUM) * 8); 690 } 691 692 static const struct regset arm_linux_gregset = 693 { 694 NULL, arm_linux_supply_gregset, arm_linux_collect_gregset 695 }; 696 697 static const struct regset arm_linux_fpregset = 698 { 699 NULL, arm_linux_supply_nwfpe, arm_linux_collect_nwfpe 700 }; 701 702 static const struct regset arm_linux_vfpregset = 703 { 704 NULL, arm_linux_supply_vfp, arm_linux_collect_vfp 705 }; 706 707 /* Iterate over core file register note sections. */ 708 709 static void 710 arm_linux_iterate_over_regset_sections (struct gdbarch *gdbarch, 711 iterate_over_regset_sections_cb *cb, 712 void *cb_data, 713 const struct regcache *regcache) 714 { 715 arm_gdbarch_tdep *tdep = gdbarch_tdep<arm_gdbarch_tdep> (gdbarch); 716 717 cb (".reg", ARM_LINUX_SIZEOF_GREGSET, ARM_LINUX_SIZEOF_GREGSET, 718 &arm_linux_gregset, NULL, cb_data); 719 720 if (tdep->vfp_register_count > 0) 721 cb (".reg-arm-vfp", ARM_LINUX_SIZEOF_VFP, ARM_LINUX_SIZEOF_VFP, 722 &arm_linux_vfpregset, "VFP floating-point", cb_data); 723 else if (tdep->have_fpa_registers) 724 cb (".reg2", ARM_LINUX_SIZEOF_NWFPE, ARM_LINUX_SIZEOF_NWFPE, 725 &arm_linux_fpregset, "FPA floating-point", cb_data); 726 } 727 728 /* Determine target description from core file. */ 729 730 static const struct target_desc * 731 arm_linux_core_read_description (struct gdbarch *gdbarch, 732 struct target_ops *target, 733 bfd *abfd) 734 { 735 gdb::optional<gdb::byte_vector> auxv = target_read_auxv_raw (target); 736 CORE_ADDR arm_hwcap = linux_get_hwcap (auxv, target, gdbarch); 737 738 if (arm_hwcap & HWCAP_VFP) 739 { 740 /* NEON implies VFPv3-D32 or no-VFP unit. Say that we only support 741 Neon with VFPv3-D32. */ 742 if (arm_hwcap & HWCAP_NEON) 743 return aarch32_read_description (); 744 else if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3) 745 return arm_read_description (ARM_FP_TYPE_VFPV3, false); 746 747 return arm_read_description (ARM_FP_TYPE_VFPV2, false); 748 } 749 750 return nullptr; 751 } 752 753 754 /* Copy the value of next pc of sigreturn and rt_sigrturn into PC, 755 return 1. In addition, set IS_THUMB depending on whether we 756 will return to ARM or Thumb code. Return 0 if it is not a 757 rt_sigreturn/sigreturn syscall. */ 758 static int 759 arm_linux_sigreturn_return_addr (frame_info_ptr frame, 760 unsigned long svc_number, 761 CORE_ADDR *pc, int *is_thumb) 762 { 763 /* Is this a sigreturn or rt_sigreturn syscall? */ 764 if (svc_number == 119 || svc_number == 173) 765 { 766 if (get_frame_type (frame) == SIGTRAMP_FRAME) 767 { 768 ULONGEST t_bit = arm_psr_thumb_bit (frame_unwind_arch (frame)); 769 CORE_ADDR cpsr 770 = frame_unwind_register_unsigned (frame, ARM_PS_REGNUM); 771 772 *is_thumb = (cpsr & t_bit) != 0; 773 *pc = frame_unwind_caller_pc (frame); 774 return 1; 775 } 776 } 777 return 0; 778 } 779 780 /* Find the value of the next PC after a sigreturn or rt_sigreturn syscall 781 based on current processor state. In addition, set IS_THUMB depending 782 on whether we will return to ARM or Thumb code. */ 783 784 static CORE_ADDR 785 arm_linux_sigreturn_next_pc (struct regcache *regcache, 786 unsigned long svc_number, int *is_thumb) 787 { 788 ULONGEST sp; 789 unsigned long sp_data; 790 CORE_ADDR next_pc = 0; 791 struct gdbarch *gdbarch = regcache->arch (); 792 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); 793 int pc_offset = 0; 794 int is_sigreturn = 0; 795 CORE_ADDR cpsr; 796 797 gdb_assert (svc_number == ARM_SIGRETURN 798 || svc_number == ARM_RT_SIGRETURN); 799 800 is_sigreturn = (svc_number == ARM_SIGRETURN); 801 regcache_cooked_read_unsigned (regcache, ARM_SP_REGNUM, &sp); 802 sp_data = read_memory_unsigned_integer (sp, 4, byte_order); 803 804 pc_offset = arm_linux_sigreturn_next_pc_offset (sp, sp_data, svc_number, 805 is_sigreturn); 806 807 next_pc = read_memory_unsigned_integer (sp + pc_offset, 4, byte_order); 808 809 /* Set IS_THUMB according the CPSR saved on the stack. */ 810 cpsr = read_memory_unsigned_integer (sp + pc_offset + 4, 4, byte_order); 811 *is_thumb = ((cpsr & arm_psr_thumb_bit (gdbarch)) != 0); 812 813 return next_pc; 814 } 815 816 /* At a ptrace syscall-stop, return the syscall number. This either 817 comes from the SWI instruction (OABI) or from r7 (EABI). 818 819 When the function fails, it should return -1. */ 820 821 static LONGEST 822 arm_linux_get_syscall_number (struct gdbarch *gdbarch, 823 thread_info *thread) 824 { 825 struct regcache *regs = get_thread_regcache (thread); 826 827 ULONGEST pc; 828 ULONGEST cpsr; 829 ULONGEST t_bit = arm_psr_thumb_bit (gdbarch); 830 int is_thumb; 831 ULONGEST svc_number = -1; 832 833 regcache_cooked_read_unsigned (regs, ARM_PC_REGNUM, &pc); 834 regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &cpsr); 835 is_thumb = (cpsr & t_bit) != 0; 836 837 if (is_thumb) 838 { 839 regcache_cooked_read_unsigned (regs, 7, &svc_number); 840 } 841 else 842 { 843 enum bfd_endian byte_order_for_code = 844 gdbarch_byte_order_for_code (gdbarch); 845 846 /* PC gets incremented before the syscall-stop, so read the 847 previous instruction. */ 848 unsigned long this_instr = 849 read_memory_unsigned_integer (pc - 4, 4, byte_order_for_code); 850 851 unsigned long svc_operand = (0x00ffffff & this_instr); 852 853 if (svc_operand) 854 { 855 /* OABI */ 856 svc_number = svc_operand - 0x900000; 857 } 858 else 859 { 860 /* EABI */ 861 regcache_cooked_read_unsigned (regs, 7, &svc_number); 862 } 863 } 864 865 return svc_number; 866 } 867 868 static CORE_ADDR 869 arm_linux_get_next_pcs_syscall_next_pc (struct arm_get_next_pcs *self) 870 { 871 CORE_ADDR next_pc = 0; 872 CORE_ADDR pc = regcache_read_pc (self->regcache); 873 int is_thumb = arm_is_thumb (self->regcache); 874 ULONGEST svc_number = 0; 875 876 if (is_thumb) 877 { 878 svc_number = regcache_raw_get_unsigned (self->regcache, 7); 879 next_pc = pc + 2; 880 } 881 else 882 { 883 struct gdbarch *gdbarch = self->regcache->arch (); 884 enum bfd_endian byte_order_for_code = 885 gdbarch_byte_order_for_code (gdbarch); 886 unsigned long this_instr = 887 read_memory_unsigned_integer (pc, 4, byte_order_for_code); 888 889 unsigned long svc_operand = (0x00ffffff & this_instr); 890 if (svc_operand) /* OABI. */ 891 { 892 svc_number = svc_operand - 0x900000; 893 } 894 else /* EABI. */ 895 { 896 svc_number = regcache_raw_get_unsigned (self->regcache, 7); 897 } 898 899 next_pc = pc + 4; 900 } 901 902 if (svc_number == ARM_SIGRETURN || svc_number == ARM_RT_SIGRETURN) 903 { 904 /* SIGRETURN or RT_SIGRETURN may affect the arm thumb mode, so 905 update IS_THUMB. */ 906 next_pc = arm_linux_sigreturn_next_pc (self->regcache, svc_number, 907 &is_thumb); 908 } 909 910 /* Addresses for calling Thumb functions have the bit 0 set. */ 911 if (is_thumb) 912 next_pc = MAKE_THUMB_ADDR (next_pc); 913 914 return next_pc; 915 } 916 917 918 /* Insert a single step breakpoint at the next executed instruction. */ 919 920 static std::vector<CORE_ADDR> 921 arm_linux_software_single_step (struct regcache *regcache) 922 { 923 struct gdbarch *gdbarch = regcache->arch (); 924 struct arm_get_next_pcs next_pcs_ctx; 925 926 /* If the target does have hardware single step, GDB doesn't have 927 to bother software single step. */ 928 if (target_can_do_single_step () == 1) 929 return {}; 930 931 arm_get_next_pcs_ctor (&next_pcs_ctx, 932 &arm_linux_get_next_pcs_ops, 933 gdbarch_byte_order (gdbarch), 934 gdbarch_byte_order_for_code (gdbarch), 935 1, 936 regcache); 937 938 std::vector<CORE_ADDR> next_pcs = arm_get_next_pcs (&next_pcs_ctx); 939 940 for (CORE_ADDR &pc_ref : next_pcs) 941 pc_ref = gdbarch_addr_bits_remove (gdbarch, pc_ref); 942 943 return next_pcs; 944 } 945 946 /* Support for displaced stepping of Linux SVC instructions. */ 947 948 static void 949 arm_linux_cleanup_svc (struct gdbarch *gdbarch, 950 struct regcache *regs, 951 arm_displaced_step_copy_insn_closure *dsc) 952 { 953 ULONGEST apparent_pc; 954 int within_scratch; 955 956 regcache_cooked_read_unsigned (regs, ARM_PC_REGNUM, &apparent_pc); 957 958 within_scratch = (apparent_pc >= dsc->scratch_base 959 && apparent_pc < (dsc->scratch_base 960 + ARM_DISPLACED_MODIFIED_INSNS * 4 + 4)); 961 962 displaced_debug_printf ("PC is apparently %.8lx after SVC step %s", 963 (unsigned long) apparent_pc, 964 (within_scratch 965 ? "(within scratch space)" 966 : "(outside scratch space)")); 967 968 if (within_scratch) 969 displaced_write_reg (regs, dsc, ARM_PC_REGNUM, 970 dsc->insn_addr + dsc->insn_size, BRANCH_WRITE_PC); 971 } 972 973 static int 974 arm_linux_copy_svc (struct gdbarch *gdbarch, struct regcache *regs, 975 arm_displaced_step_copy_insn_closure *dsc) 976 { 977 CORE_ADDR return_to = 0; 978 979 frame_info_ptr frame; 980 unsigned int svc_number = displaced_read_reg (regs, dsc, 7); 981 int is_sigreturn = 0; 982 int is_thumb; 983 984 frame = get_current_frame (); 985 986 is_sigreturn = arm_linux_sigreturn_return_addr(frame, svc_number, 987 &return_to, &is_thumb); 988 if (is_sigreturn) 989 { 990 struct symtab_and_line sal; 991 992 displaced_debug_printf ("found sigreturn/rt_sigreturn SVC call. " 993 "PC in frame = %lx", 994 (unsigned long) get_frame_pc (frame)); 995 996 displaced_debug_printf ("unwind pc = %lx. Setting momentary breakpoint.", 997 (unsigned long) return_to); 998 999 gdb_assert (inferior_thread ()->control.step_resume_breakpoint 1000 == NULL); 1001 1002 sal = find_pc_line (return_to, 0); 1003 sal.pc = return_to; 1004 sal.section = find_pc_overlay (return_to); 1005 sal.explicit_pc = 1; 1006 1007 frame = get_prev_frame (frame); 1008 1009 if (frame) 1010 { 1011 inferior_thread ()->control.step_resume_breakpoint 1012 = set_momentary_breakpoint (gdbarch, sal, get_frame_id (frame), 1013 bp_step_resume).release (); 1014 1015 /* set_momentary_breakpoint invalidates FRAME. */ 1016 frame = NULL; 1017 1018 /* We need to make sure we actually insert the momentary 1019 breakpoint set above. */ 1020 insert_breakpoints (); 1021 } 1022 else 1023 displaced_debug_printf ("couldn't find previous frame to set momentary " 1024 "breakpoint for sigreturn/rt_sigreturn"); 1025 } 1026 else 1027 displaced_debug_printf ("found SVC call"); 1028 1029 /* Preparation: If we detect sigreturn, set momentary breakpoint at resume 1030 location, else nothing. 1031 Insn: unmodified svc. 1032 Cleanup: if pc lands in scratch space, pc <- insn_addr + insn_size 1033 else leave pc alone. */ 1034 1035 1036 dsc->cleanup = &arm_linux_cleanup_svc; 1037 /* Pretend we wrote to the PC, so cleanup doesn't set PC to the next 1038 instruction. */ 1039 dsc->wrote_to_pc = 1; 1040 1041 return 0; 1042 } 1043 1044 1045 /* The following two functions implement single-stepping over calls to Linux 1046 kernel helper routines, which perform e.g. atomic operations on architecture 1047 variants which don't support them natively. 1048 1049 When this function is called, the PC will be pointing at the kernel helper 1050 (at an address inaccessible to GDB), and r14 will point to the return 1051 address. Displaced stepping always executes code in the copy area: 1052 so, make the copy-area instruction branch back to the kernel helper (the 1053 "from" address), and make r14 point to the breakpoint in the copy area. In 1054 that way, we regain control once the kernel helper returns, and can clean 1055 up appropriately (as if we had just returned from the kernel helper as it 1056 would have been called from the non-displaced location). */ 1057 1058 static void 1059 cleanup_kernel_helper_return (struct gdbarch *gdbarch, 1060 struct regcache *regs, 1061 arm_displaced_step_copy_insn_closure *dsc) 1062 { 1063 displaced_write_reg (regs, dsc, ARM_LR_REGNUM, dsc->tmp[0], CANNOT_WRITE_PC); 1064 displaced_write_reg (regs, dsc, ARM_PC_REGNUM, dsc->tmp[0], BRANCH_WRITE_PC); 1065 } 1066 1067 static void 1068 arm_catch_kernel_helper_return (struct gdbarch *gdbarch, CORE_ADDR from, 1069 CORE_ADDR to, struct regcache *regs, 1070 arm_displaced_step_copy_insn_closure *dsc) 1071 { 1072 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); 1073 1074 dsc->numinsns = 1; 1075 dsc->insn_addr = from; 1076 dsc->cleanup = &cleanup_kernel_helper_return; 1077 /* Say we wrote to the PC, else cleanup will set PC to the next 1078 instruction in the helper, which isn't helpful. */ 1079 dsc->wrote_to_pc = 1; 1080 1081 /* Preparation: tmp[0] <- r14 1082 r14 <- <scratch space>+4 1083 *(<scratch space>+8) <- from 1084 Insn: ldr pc, [r14, #4] 1085 Cleanup: r14 <- tmp[0], pc <- tmp[0]. */ 1086 1087 dsc->tmp[0] = displaced_read_reg (regs, dsc, ARM_LR_REGNUM); 1088 displaced_write_reg (regs, dsc, ARM_LR_REGNUM, (ULONGEST) to + 4, 1089 CANNOT_WRITE_PC); 1090 write_memory_unsigned_integer (to + 8, 4, byte_order, from); 1091 1092 dsc->modinsn[0] = 0xe59ef004; /* ldr pc, [lr, #4]. */ 1093 } 1094 1095 /* Linux-specific displaced step instruction copying function. Detects when 1096 the program has stepped into a Linux kernel helper routine (which must be 1097 handled as a special case). */ 1098 1099 static displaced_step_copy_insn_closure_up 1100 arm_linux_displaced_step_copy_insn (struct gdbarch *gdbarch, 1101 CORE_ADDR from, CORE_ADDR to, 1102 struct regcache *regs) 1103 { 1104 std::unique_ptr<arm_displaced_step_copy_insn_closure> dsc 1105 (new arm_displaced_step_copy_insn_closure); 1106 1107 /* Detect when we enter an (inaccessible by GDB) Linux kernel helper, and 1108 stop at the return location. */ 1109 if (from > 0xffff0000) 1110 { 1111 displaced_debug_printf ("detected kernel helper at %.8lx", 1112 (unsigned long) from); 1113 1114 arm_catch_kernel_helper_return (gdbarch, from, to, regs, dsc.get ()); 1115 } 1116 else 1117 { 1118 /* Override the default handling of SVC instructions. */ 1119 dsc->u.svc.copy_svc_os = arm_linux_copy_svc; 1120 1121 arm_process_displaced_insn (gdbarch, from, to, regs, dsc.get ()); 1122 } 1123 1124 arm_displaced_init_closure (gdbarch, from, to, dsc.get ()); 1125 1126 /* This is a work around for a problem with g++ 4.8. */ 1127 return displaced_step_copy_insn_closure_up (dsc.release ()); 1128 } 1129 1130 /* Implementation of `gdbarch_stap_is_single_operand', as defined in 1131 gdbarch.h. */ 1132 1133 static int 1134 arm_stap_is_single_operand (struct gdbarch *gdbarch, const char *s) 1135 { 1136 return (*s == '#' || *s == '$' || isdigit (*s) /* Literal number. */ 1137 || *s == '[' /* Register indirection or 1138 displacement. */ 1139 || isalpha (*s)); /* Register value. */ 1140 } 1141 1142 /* This routine is used to parse a special token in ARM's assembly. 1143 1144 The special tokens parsed by it are: 1145 1146 - Register displacement (e.g, [fp, #-8]) 1147 1148 It returns one if the special token has been parsed successfully, 1149 or zero if the current token is not considered special. */ 1150 1151 static expr::operation_up 1152 arm_stap_parse_special_token (struct gdbarch *gdbarch, 1153 struct stap_parse_info *p) 1154 { 1155 if (*p->arg == '[') 1156 { 1157 /* Temporary holder for lookahead. */ 1158 const char *tmp = p->arg; 1159 char *endp; 1160 /* Used to save the register name. */ 1161 const char *start; 1162 char *regname; 1163 int len, offset; 1164 int got_minus = 0; 1165 long displacement; 1166 1167 ++tmp; 1168 start = tmp; 1169 1170 /* Register name. */ 1171 while (isalnum (*tmp)) 1172 ++tmp; 1173 1174 if (*tmp != ',') 1175 return {}; 1176 1177 len = tmp - start; 1178 regname = (char *) alloca (len + 2); 1179 1180 offset = 0; 1181 if (isdigit (*start)) 1182 { 1183 /* If we are dealing with a register whose name begins with a 1184 digit, it means we should prefix the name with the letter 1185 `r', because GDB expects this name pattern. Otherwise (e.g., 1186 we are dealing with the register `fp'), we don't need to 1187 add such a prefix. */ 1188 regname[0] = 'r'; 1189 offset = 1; 1190 } 1191 1192 strncpy (regname + offset, start, len); 1193 len += offset; 1194 regname[len] = '\0'; 1195 1196 if (user_reg_map_name_to_regnum (gdbarch, regname, len) == -1) 1197 error (_("Invalid register name `%s' on expression `%s'."), 1198 regname, p->saved_arg); 1199 1200 ++tmp; 1201 tmp = skip_spaces (tmp); 1202 if (*tmp == '#' || *tmp == '$') 1203 ++tmp; 1204 1205 if (*tmp == '-') 1206 { 1207 ++tmp; 1208 got_minus = 1; 1209 } 1210 1211 displacement = strtol (tmp, &endp, 10); 1212 tmp = endp; 1213 1214 /* Skipping last `]'. */ 1215 if (*tmp++ != ']') 1216 return {}; 1217 p->arg = tmp; 1218 1219 using namespace expr; 1220 1221 /* The displacement. */ 1222 struct type *long_type = builtin_type (gdbarch)->builtin_long; 1223 if (got_minus) 1224 displacement = -displacement; 1225 operation_up disp = make_operation<long_const_operation> (long_type, 1226 displacement); 1227 1228 /* The register name. */ 1229 operation_up reg 1230 = make_operation<register_operation> (regname); 1231 1232 operation_up sum 1233 = make_operation<add_operation> (std::move (reg), std::move (disp)); 1234 1235 /* Casting to the expected type. */ 1236 struct type *arg_ptr_type = lookup_pointer_type (p->arg_type); 1237 sum = make_operation<unop_cast_operation> (std::move (sum), 1238 arg_ptr_type); 1239 return make_operation<unop_ind_operation> (std::move (sum)); 1240 } 1241 1242 return {}; 1243 } 1244 1245 /* ARM process record-replay constructs: syscall, signal etc. */ 1246 1247 static linux_record_tdep arm_linux_record_tdep; 1248 1249 /* arm_canonicalize_syscall maps from the native arm Linux set 1250 of syscall ids into a canonical set of syscall ids used by 1251 process record. */ 1252 1253 static enum gdb_syscall 1254 arm_canonicalize_syscall (int syscall) 1255 { 1256 switch (syscall) 1257 { 1258 case 0: return gdb_sys_restart_syscall; 1259 case 1: return gdb_sys_exit; 1260 case 2: return gdb_sys_fork; 1261 case 3: return gdb_sys_read; 1262 case 4: return gdb_sys_write; 1263 case 5: return gdb_sys_open; 1264 case 6: return gdb_sys_close; 1265 case 8: return gdb_sys_creat; 1266 case 9: return gdb_sys_link; 1267 case 10: return gdb_sys_unlink; 1268 case 11: return gdb_sys_execve; 1269 case 12: return gdb_sys_chdir; 1270 case 13: return gdb_sys_time; 1271 case 14: return gdb_sys_mknod; 1272 case 15: return gdb_sys_chmod; 1273 case 16: return gdb_sys_lchown16; 1274 case 19: return gdb_sys_lseek; 1275 case 20: return gdb_sys_getpid; 1276 case 21: return gdb_sys_mount; 1277 case 22: return gdb_sys_oldumount; 1278 case 23: return gdb_sys_setuid16; 1279 case 24: return gdb_sys_getuid16; 1280 case 25: return gdb_sys_stime; 1281 case 26: return gdb_sys_ptrace; 1282 case 27: return gdb_sys_alarm; 1283 case 29: return gdb_sys_pause; 1284 case 30: return gdb_sys_utime; 1285 case 33: return gdb_sys_access; 1286 case 34: return gdb_sys_nice; 1287 case 36: return gdb_sys_sync; 1288 case 37: return gdb_sys_kill; 1289 case 38: return gdb_sys_rename; 1290 case 39: return gdb_sys_mkdir; 1291 case 40: return gdb_sys_rmdir; 1292 case 41: return gdb_sys_dup; 1293 case 42: return gdb_sys_pipe; 1294 case 43: return gdb_sys_times; 1295 case 45: return gdb_sys_brk; 1296 case 46: return gdb_sys_setgid16; 1297 case 47: return gdb_sys_getgid16; 1298 case 49: return gdb_sys_geteuid16; 1299 case 50: return gdb_sys_getegid16; 1300 case 51: return gdb_sys_acct; 1301 case 52: return gdb_sys_umount; 1302 case 54: return gdb_sys_ioctl; 1303 case 55: return gdb_sys_fcntl; 1304 case 57: return gdb_sys_setpgid; 1305 case 60: return gdb_sys_umask; 1306 case 61: return gdb_sys_chroot; 1307 case 62: return gdb_sys_ustat; 1308 case 63: return gdb_sys_dup2; 1309 case 64: return gdb_sys_getppid; 1310 case 65: return gdb_sys_getpgrp; 1311 case 66: return gdb_sys_setsid; 1312 case 67: return gdb_sys_sigaction; 1313 case 70: return gdb_sys_setreuid16; 1314 case 71: return gdb_sys_setregid16; 1315 case 72: return gdb_sys_sigsuspend; 1316 case 73: return gdb_sys_sigpending; 1317 case 74: return gdb_sys_sethostname; 1318 case 75: return gdb_sys_setrlimit; 1319 case 76: return gdb_sys_getrlimit; 1320 case 77: return gdb_sys_getrusage; 1321 case 78: return gdb_sys_gettimeofday; 1322 case 79: return gdb_sys_settimeofday; 1323 case 80: return gdb_sys_getgroups16; 1324 case 81: return gdb_sys_setgroups16; 1325 case 82: return gdb_sys_select; 1326 case 83: return gdb_sys_symlink; 1327 case 85: return gdb_sys_readlink; 1328 case 86: return gdb_sys_uselib; 1329 case 87: return gdb_sys_swapon; 1330 case 88: return gdb_sys_reboot; 1331 case 89: return gdb_old_readdir; 1332 case 90: return gdb_old_mmap; 1333 case 91: return gdb_sys_munmap; 1334 case 92: return gdb_sys_truncate; 1335 case 93: return gdb_sys_ftruncate; 1336 case 94: return gdb_sys_fchmod; 1337 case 95: return gdb_sys_fchown16; 1338 case 96: return gdb_sys_getpriority; 1339 case 97: return gdb_sys_setpriority; 1340 case 99: return gdb_sys_statfs; 1341 case 100: return gdb_sys_fstatfs; 1342 case 102: return gdb_sys_socketcall; 1343 case 103: return gdb_sys_syslog; 1344 case 104: return gdb_sys_setitimer; 1345 case 105: return gdb_sys_getitimer; 1346 case 106: return gdb_sys_stat; 1347 case 107: return gdb_sys_lstat; 1348 case 108: return gdb_sys_fstat; 1349 case 111: return gdb_sys_vhangup; 1350 case 113: /* sys_syscall */ 1351 return gdb_sys_no_syscall; 1352 case 114: return gdb_sys_wait4; 1353 case 115: return gdb_sys_swapoff; 1354 case 116: return gdb_sys_sysinfo; 1355 case 117: return gdb_sys_ipc; 1356 case 118: return gdb_sys_fsync; 1357 case 119: return gdb_sys_sigreturn; 1358 case 120: return gdb_sys_clone; 1359 case 121: return gdb_sys_setdomainname; 1360 case 122: return gdb_sys_uname; 1361 case 124: return gdb_sys_adjtimex; 1362 case 125: return gdb_sys_mprotect; 1363 case 126: return gdb_sys_sigprocmask; 1364 case 128: return gdb_sys_init_module; 1365 case 129: return gdb_sys_delete_module; 1366 case 131: return gdb_sys_quotactl; 1367 case 132: return gdb_sys_getpgid; 1368 case 133: return gdb_sys_fchdir; 1369 case 134: return gdb_sys_bdflush; 1370 case 135: return gdb_sys_sysfs; 1371 case 136: return gdb_sys_personality; 1372 case 138: return gdb_sys_setfsuid16; 1373 case 139: return gdb_sys_setfsgid16; 1374 case 140: return gdb_sys_llseek; 1375 case 141: return gdb_sys_getdents; 1376 case 142: return gdb_sys_select; 1377 case 143: return gdb_sys_flock; 1378 case 144: return gdb_sys_msync; 1379 case 145: return gdb_sys_readv; 1380 case 146: return gdb_sys_writev; 1381 case 147: return gdb_sys_getsid; 1382 case 148: return gdb_sys_fdatasync; 1383 case 149: return gdb_sys_sysctl; 1384 case 150: return gdb_sys_mlock; 1385 case 151: return gdb_sys_munlock; 1386 case 152: return gdb_sys_mlockall; 1387 case 153: return gdb_sys_munlockall; 1388 case 154: return gdb_sys_sched_setparam; 1389 case 155: return gdb_sys_sched_getparam; 1390 case 156: return gdb_sys_sched_setscheduler; 1391 case 157: return gdb_sys_sched_getscheduler; 1392 case 158: return gdb_sys_sched_yield; 1393 case 159: return gdb_sys_sched_get_priority_max; 1394 case 160: return gdb_sys_sched_get_priority_min; 1395 case 161: return gdb_sys_sched_rr_get_interval; 1396 case 162: return gdb_sys_nanosleep; 1397 case 163: return gdb_sys_mremap; 1398 case 164: return gdb_sys_setresuid16; 1399 case 165: return gdb_sys_getresuid16; 1400 case 168: return gdb_sys_poll; 1401 case 169: return gdb_sys_nfsservctl; 1402 case 170: return gdb_sys_setresgid; 1403 case 171: return gdb_sys_getresgid; 1404 case 172: return gdb_sys_prctl; 1405 case 173: return gdb_sys_rt_sigreturn; 1406 case 174: return gdb_sys_rt_sigaction; 1407 case 175: return gdb_sys_rt_sigprocmask; 1408 case 176: return gdb_sys_rt_sigpending; 1409 case 177: return gdb_sys_rt_sigtimedwait; 1410 case 178: return gdb_sys_rt_sigqueueinfo; 1411 case 179: return gdb_sys_rt_sigsuspend; 1412 case 180: return gdb_sys_pread64; 1413 case 181: return gdb_sys_pwrite64; 1414 case 182: return gdb_sys_chown; 1415 case 183: return gdb_sys_getcwd; 1416 case 184: return gdb_sys_capget; 1417 case 185: return gdb_sys_capset; 1418 case 186: return gdb_sys_sigaltstack; 1419 case 187: return gdb_sys_sendfile; 1420 case 190: return gdb_sys_vfork; 1421 case 191: return gdb_sys_getrlimit; 1422 case 192: return gdb_sys_mmap2; 1423 case 193: return gdb_sys_truncate64; 1424 case 194: return gdb_sys_ftruncate64; 1425 case 195: return gdb_sys_stat64; 1426 case 196: return gdb_sys_lstat64; 1427 case 197: return gdb_sys_fstat64; 1428 case 198: return gdb_sys_lchown; 1429 case 199: return gdb_sys_getuid; 1430 case 200: return gdb_sys_getgid; 1431 case 201: return gdb_sys_geteuid; 1432 case 202: return gdb_sys_getegid; 1433 case 203: return gdb_sys_setreuid; 1434 case 204: return gdb_sys_setregid; 1435 case 205: return gdb_sys_getgroups; 1436 case 206: return gdb_sys_setgroups; 1437 case 207: return gdb_sys_fchown; 1438 case 208: return gdb_sys_setresuid; 1439 case 209: return gdb_sys_getresuid; 1440 case 210: return gdb_sys_setresgid; 1441 case 211: return gdb_sys_getresgid; 1442 case 212: return gdb_sys_chown; 1443 case 213: return gdb_sys_setuid; 1444 case 214: return gdb_sys_setgid; 1445 case 215: return gdb_sys_setfsuid; 1446 case 216: return gdb_sys_setfsgid; 1447 case 217: return gdb_sys_getdents64; 1448 case 218: return gdb_sys_pivot_root; 1449 case 219: return gdb_sys_mincore; 1450 case 220: return gdb_sys_madvise; 1451 case 221: return gdb_sys_fcntl64; 1452 case 224: return gdb_sys_gettid; 1453 case 225: return gdb_sys_readahead; 1454 case 226: return gdb_sys_setxattr; 1455 case 227: return gdb_sys_lsetxattr; 1456 case 228: return gdb_sys_fsetxattr; 1457 case 229: return gdb_sys_getxattr; 1458 case 230: return gdb_sys_lgetxattr; 1459 case 231: return gdb_sys_fgetxattr; 1460 case 232: return gdb_sys_listxattr; 1461 case 233: return gdb_sys_llistxattr; 1462 case 234: return gdb_sys_flistxattr; 1463 case 235: return gdb_sys_removexattr; 1464 case 236: return gdb_sys_lremovexattr; 1465 case 237: return gdb_sys_fremovexattr; 1466 case 238: return gdb_sys_tkill; 1467 case 239: return gdb_sys_sendfile64; 1468 case 240: return gdb_sys_futex; 1469 case 241: return gdb_sys_sched_setaffinity; 1470 case 242: return gdb_sys_sched_getaffinity; 1471 case 243: return gdb_sys_io_setup; 1472 case 244: return gdb_sys_io_destroy; 1473 case 245: return gdb_sys_io_getevents; 1474 case 246: return gdb_sys_io_submit; 1475 case 247: return gdb_sys_io_cancel; 1476 case 248: return gdb_sys_exit_group; 1477 case 249: return gdb_sys_lookup_dcookie; 1478 case 250: return gdb_sys_epoll_create; 1479 case 251: return gdb_sys_epoll_ctl; 1480 case 252: return gdb_sys_epoll_wait; 1481 case 253: return gdb_sys_remap_file_pages; 1482 case 256: return gdb_sys_set_tid_address; 1483 case 257: return gdb_sys_timer_create; 1484 case 258: return gdb_sys_timer_settime; 1485 case 259: return gdb_sys_timer_gettime; 1486 case 260: return gdb_sys_timer_getoverrun; 1487 case 261: return gdb_sys_timer_delete; 1488 case 262: return gdb_sys_clock_settime; 1489 case 263: return gdb_sys_clock_gettime; 1490 case 264: return gdb_sys_clock_getres; 1491 case 265: return gdb_sys_clock_nanosleep; 1492 case 266: return gdb_sys_statfs64; 1493 case 267: return gdb_sys_fstatfs64; 1494 case 268: return gdb_sys_tgkill; 1495 case 269: return gdb_sys_utimes; 1496 /* 1497 case 270: return gdb_sys_arm_fadvise64_64; 1498 case 271: return gdb_sys_pciconfig_iobase; 1499 case 272: return gdb_sys_pciconfig_read; 1500 case 273: return gdb_sys_pciconfig_write; 1501 */ 1502 case 274: return gdb_sys_mq_open; 1503 case 275: return gdb_sys_mq_unlink; 1504 case 276: return gdb_sys_mq_timedsend; 1505 case 277: return gdb_sys_mq_timedreceive; 1506 case 278: return gdb_sys_mq_notify; 1507 case 279: return gdb_sys_mq_getsetattr; 1508 case 280: return gdb_sys_waitid; 1509 case 281: return gdb_sys_socket; 1510 case 282: return gdb_sys_bind; 1511 case 283: return gdb_sys_connect; 1512 case 284: return gdb_sys_listen; 1513 case 285: return gdb_sys_accept; 1514 case 286: return gdb_sys_getsockname; 1515 case 287: return gdb_sys_getpeername; 1516 case 288: return gdb_sys_socketpair; 1517 case 289: /* send */ return gdb_sys_no_syscall; 1518 case 290: return gdb_sys_sendto; 1519 case 291: return gdb_sys_recv; 1520 case 292: return gdb_sys_recvfrom; 1521 case 293: return gdb_sys_shutdown; 1522 case 294: return gdb_sys_setsockopt; 1523 case 295: return gdb_sys_getsockopt; 1524 case 296: return gdb_sys_sendmsg; 1525 case 297: return gdb_sys_recvmsg; 1526 case 298: return gdb_sys_semop; 1527 case 299: return gdb_sys_semget; 1528 case 300: return gdb_sys_semctl; 1529 case 301: return gdb_sys_msgsnd; 1530 case 302: return gdb_sys_msgrcv; 1531 case 303: return gdb_sys_msgget; 1532 case 304: return gdb_sys_msgctl; 1533 case 305: return gdb_sys_shmat; 1534 case 306: return gdb_sys_shmdt; 1535 case 307: return gdb_sys_shmget; 1536 case 308: return gdb_sys_shmctl; 1537 case 309: return gdb_sys_add_key; 1538 case 310: return gdb_sys_request_key; 1539 case 311: return gdb_sys_keyctl; 1540 case 312: return gdb_sys_semtimedop; 1541 case 313: /* vserver */ return gdb_sys_no_syscall; 1542 case 314: return gdb_sys_ioprio_set; 1543 case 315: return gdb_sys_ioprio_get; 1544 case 316: return gdb_sys_inotify_init; 1545 case 317: return gdb_sys_inotify_add_watch; 1546 case 318: return gdb_sys_inotify_rm_watch; 1547 case 319: return gdb_sys_mbind; 1548 case 320: return gdb_sys_get_mempolicy; 1549 case 321: return gdb_sys_set_mempolicy; 1550 case 322: return gdb_sys_openat; 1551 case 323: return gdb_sys_mkdirat; 1552 case 324: return gdb_sys_mknodat; 1553 case 325: return gdb_sys_fchownat; 1554 case 326: return gdb_sys_futimesat; 1555 case 327: return gdb_sys_fstatat64; 1556 case 328: return gdb_sys_unlinkat; 1557 case 329: return gdb_sys_renameat; 1558 case 330: return gdb_sys_linkat; 1559 case 331: return gdb_sys_symlinkat; 1560 case 332: return gdb_sys_readlinkat; 1561 case 333: return gdb_sys_fchmodat; 1562 case 334: return gdb_sys_faccessat; 1563 case 335: return gdb_sys_pselect6; 1564 case 336: return gdb_sys_ppoll; 1565 case 337: return gdb_sys_unshare; 1566 case 338: return gdb_sys_set_robust_list; 1567 case 339: return gdb_sys_get_robust_list; 1568 case 340: return gdb_sys_splice; 1569 /*case 341: return gdb_sys_arm_sync_file_range;*/ 1570 case 342: return gdb_sys_tee; 1571 case 343: return gdb_sys_vmsplice; 1572 case 344: return gdb_sys_move_pages; 1573 case 345: return gdb_sys_getcpu; 1574 case 346: return gdb_sys_epoll_pwait; 1575 case 347: return gdb_sys_kexec_load; 1576 /* 1577 case 348: return gdb_sys_utimensat; 1578 case 349: return gdb_sys_signalfd; 1579 case 350: return gdb_sys_timerfd_create; 1580 case 351: return gdb_sys_eventfd; 1581 */ 1582 case 352: return gdb_sys_fallocate; 1583 /* 1584 case 353: return gdb_sys_timerfd_settime; 1585 case 354: return gdb_sys_timerfd_gettime; 1586 case 355: return gdb_sys_signalfd4; 1587 */ 1588 case 356: return gdb_sys_eventfd2; 1589 case 357: return gdb_sys_epoll_create1; 1590 case 358: return gdb_sys_dup3; 1591 case 359: return gdb_sys_pipe2; 1592 case 360: return gdb_sys_inotify_init1; 1593 /* 1594 case 361: return gdb_sys_preadv; 1595 case 362: return gdb_sys_pwritev; 1596 case 363: return gdb_sys_rt_tgsigqueueinfo; 1597 case 364: return gdb_sys_perf_event_open; 1598 case 365: return gdb_sys_recvmmsg; 1599 case 366: return gdb_sys_accept4; 1600 case 367: return gdb_sys_fanotify_init; 1601 case 368: return gdb_sys_fanotify_mark; 1602 case 369: return gdb_sys_prlimit64; 1603 case 370: return gdb_sys_name_to_handle_at; 1604 case 371: return gdb_sys_open_by_handle_at; 1605 case 372: return gdb_sys_clock_adjtime; 1606 case 373: return gdb_sys_syncfs; 1607 case 374: return gdb_sys_sendmmsg; 1608 case 375: return gdb_sys_setns; 1609 case 376: return gdb_sys_process_vm_readv; 1610 case 377: return gdb_sys_process_vm_writev; 1611 case 378: return gdb_sys_kcmp; 1612 case 379: return gdb_sys_finit_module; 1613 */ 1614 case 384: return gdb_sys_getrandom; 1615 case 983041: /* ARM_breakpoint */ return gdb_sys_no_syscall; 1616 case 983042: /* ARM_cacheflush */ return gdb_sys_no_syscall; 1617 case 983043: /* ARM_usr26 */ return gdb_sys_no_syscall; 1618 case 983044: /* ARM_usr32 */ return gdb_sys_no_syscall; 1619 case 983045: /* ARM_set_tls */ return gdb_sys_no_syscall; 1620 default: return gdb_sys_no_syscall; 1621 } 1622 } 1623 1624 /* Record all registers but PC register for process-record. */ 1625 1626 static int 1627 arm_all_but_pc_registers_record (struct regcache *regcache) 1628 { 1629 int i; 1630 1631 for (i = 0; i < ARM_PC_REGNUM; i++) 1632 { 1633 if (record_full_arch_list_add_reg (regcache, ARM_A1_REGNUM + i)) 1634 return -1; 1635 } 1636 1637 if (record_full_arch_list_add_reg (regcache, ARM_PS_REGNUM)) 1638 return -1; 1639 1640 return 0; 1641 } 1642 1643 /* Handler for arm system call instruction recording. */ 1644 1645 static int 1646 arm_linux_syscall_record (struct regcache *regcache, unsigned long svc_number) 1647 { 1648 int ret = 0; 1649 enum gdb_syscall syscall_gdb; 1650 1651 syscall_gdb = arm_canonicalize_syscall (svc_number); 1652 1653 if (syscall_gdb == gdb_sys_no_syscall) 1654 { 1655 gdb_printf (gdb_stderr, 1656 _("Process record and replay target doesn't " 1657 "support syscall number %s\n"), 1658 plongest (svc_number)); 1659 return -1; 1660 } 1661 1662 if (syscall_gdb == gdb_sys_sigreturn 1663 || syscall_gdb == gdb_sys_rt_sigreturn) 1664 { 1665 if (arm_all_but_pc_registers_record (regcache)) 1666 return -1; 1667 return 0; 1668 } 1669 1670 ret = record_linux_system_call (syscall_gdb, regcache, 1671 &arm_linux_record_tdep); 1672 if (ret != 0) 1673 return ret; 1674 1675 /* Record the return value of the system call. */ 1676 if (record_full_arch_list_add_reg (regcache, ARM_A1_REGNUM)) 1677 return -1; 1678 /* Record LR. */ 1679 if (record_full_arch_list_add_reg (regcache, ARM_LR_REGNUM)) 1680 return -1; 1681 /* Record CPSR. */ 1682 if (record_full_arch_list_add_reg (regcache, ARM_PS_REGNUM)) 1683 return -1; 1684 1685 return 0; 1686 } 1687 1688 /* Implement the skip_trampoline_code gdbarch method. */ 1689 1690 static CORE_ADDR 1691 arm_linux_skip_trampoline_code (frame_info_ptr frame, CORE_ADDR pc) 1692 { 1693 CORE_ADDR target_pc = arm_skip_stub (frame, pc); 1694 1695 if (target_pc != 0) 1696 return target_pc; 1697 1698 return find_solib_trampoline_target (frame, pc); 1699 } 1700 1701 /* Implement the gcc_target_options gdbarch method. */ 1702 1703 static std::string 1704 arm_linux_gcc_target_options (struct gdbarch *gdbarch) 1705 { 1706 /* GCC doesn't know "-m32". */ 1707 return {}; 1708 } 1709 1710 static void 1711 arm_linux_init_abi (struct gdbarch_info info, 1712 struct gdbarch *gdbarch) 1713 { 1714 static const char *const stap_integer_prefixes[] = { "#", "$", "", NULL }; 1715 static const char *const stap_register_prefixes[] = { "r", NULL }; 1716 static const char *const stap_register_indirection_prefixes[] = { "[", 1717 NULL }; 1718 static const char *const stap_register_indirection_suffixes[] = { "]", 1719 NULL }; 1720 arm_gdbarch_tdep *tdep = gdbarch_tdep<arm_gdbarch_tdep> (gdbarch); 1721 1722 linux_init_abi (info, gdbarch, 1); 1723 1724 tdep->lowest_pc = 0x8000; 1725 if (info.byte_order_for_code == BFD_ENDIAN_BIG) 1726 { 1727 if (tdep->arm_abi == ARM_ABI_AAPCS) 1728 tdep->arm_breakpoint = eabi_linux_arm_be_breakpoint; 1729 else 1730 tdep->arm_breakpoint = arm_linux_arm_be_breakpoint; 1731 tdep->thumb_breakpoint = arm_linux_thumb_be_breakpoint; 1732 tdep->thumb2_breakpoint = arm_linux_thumb2_be_breakpoint; 1733 } 1734 else 1735 { 1736 if (tdep->arm_abi == ARM_ABI_AAPCS) 1737 tdep->arm_breakpoint = eabi_linux_arm_le_breakpoint; 1738 else 1739 tdep->arm_breakpoint = arm_linux_arm_le_breakpoint; 1740 tdep->thumb_breakpoint = arm_linux_thumb_le_breakpoint; 1741 tdep->thumb2_breakpoint = arm_linux_thumb2_le_breakpoint; 1742 } 1743 tdep->arm_breakpoint_size = sizeof (arm_linux_arm_le_breakpoint); 1744 tdep->thumb_breakpoint_size = sizeof (arm_linux_thumb_le_breakpoint); 1745 tdep->thumb2_breakpoint_size = sizeof (arm_linux_thumb2_le_breakpoint); 1746 1747 if (tdep->fp_model == ARM_FLOAT_AUTO) 1748 tdep->fp_model = ARM_FLOAT_FPA; 1749 1750 switch (tdep->fp_model) 1751 { 1752 case ARM_FLOAT_FPA: 1753 tdep->jb_pc = ARM_LINUX_JB_PC_FPA; 1754 break; 1755 case ARM_FLOAT_SOFT_FPA: 1756 case ARM_FLOAT_SOFT_VFP: 1757 case ARM_FLOAT_VFP: 1758 tdep->jb_pc = ARM_LINUX_JB_PC_EABI; 1759 break; 1760 default: 1761 internal_error 1762 (_("arm_linux_init_abi: Floating point model not supported")); 1763 break; 1764 } 1765 tdep->jb_elt_size = ARM_LINUX_JB_ELEMENT_SIZE; 1766 1767 set_solib_svr4_fetch_link_map_offsets 1768 (gdbarch, linux_ilp32_fetch_link_map_offsets); 1769 1770 /* Single stepping. */ 1771 set_gdbarch_software_single_step (gdbarch, arm_linux_software_single_step); 1772 1773 /* Shared library handling. */ 1774 set_gdbarch_skip_trampoline_code (gdbarch, arm_linux_skip_trampoline_code); 1775 set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); 1776 1777 /* Enable TLS support. */ 1778 set_gdbarch_fetch_tls_load_module_address (gdbarch, 1779 svr4_fetch_objfile_link_map); 1780 1781 tramp_frame_prepend_unwinder (gdbarch, 1782 &arm_linux_sigreturn_tramp_frame); 1783 tramp_frame_prepend_unwinder (gdbarch, 1784 &arm_linux_rt_sigreturn_tramp_frame); 1785 tramp_frame_prepend_unwinder (gdbarch, 1786 &arm_eabi_linux_sigreturn_tramp_frame); 1787 tramp_frame_prepend_unwinder (gdbarch, 1788 &arm_eabi_linux_rt_sigreturn_tramp_frame); 1789 tramp_frame_prepend_unwinder (gdbarch, 1790 &thumb2_eabi_linux_sigreturn_tramp_frame); 1791 tramp_frame_prepend_unwinder (gdbarch, 1792 &thumb2_eabi_linux_rt_sigreturn_tramp_frame); 1793 tramp_frame_prepend_unwinder (gdbarch, 1794 &arm_linux_restart_syscall_tramp_frame); 1795 tramp_frame_prepend_unwinder (gdbarch, 1796 &arm_kernel_linux_restart_syscall_tramp_frame); 1797 1798 /* Core file support. */ 1799 set_gdbarch_iterate_over_regset_sections 1800 (gdbarch, arm_linux_iterate_over_regset_sections); 1801 set_gdbarch_core_read_description (gdbarch, arm_linux_core_read_description); 1802 1803 /* Displaced stepping. */ 1804 set_gdbarch_displaced_step_copy_insn (gdbarch, 1805 arm_linux_displaced_step_copy_insn); 1806 set_gdbarch_displaced_step_fixup (gdbarch, arm_displaced_step_fixup); 1807 1808 /* Reversible debugging, process record. */ 1809 set_gdbarch_process_record (gdbarch, arm_process_record); 1810 1811 /* SystemTap functions. */ 1812 set_gdbarch_stap_integer_prefixes (gdbarch, stap_integer_prefixes); 1813 set_gdbarch_stap_register_prefixes (gdbarch, stap_register_prefixes); 1814 set_gdbarch_stap_register_indirection_prefixes (gdbarch, 1815 stap_register_indirection_prefixes); 1816 set_gdbarch_stap_register_indirection_suffixes (gdbarch, 1817 stap_register_indirection_suffixes); 1818 set_gdbarch_stap_gdb_register_prefix (gdbarch, "r"); 1819 set_gdbarch_stap_is_single_operand (gdbarch, arm_stap_is_single_operand); 1820 set_gdbarch_stap_parse_special_token (gdbarch, 1821 arm_stap_parse_special_token); 1822 1823 /* `catch syscall' */ 1824 set_xml_syscall_file_name (gdbarch, "syscalls/arm-linux.xml"); 1825 set_gdbarch_get_syscall_number (gdbarch, arm_linux_get_syscall_number); 1826 1827 /* Syscall record. */ 1828 tdep->arm_syscall_record = arm_linux_syscall_record; 1829 1830 /* Initialize the arm_linux_record_tdep. */ 1831 /* These values are the size of the type that will be used in a system 1832 call. They are obtained from Linux Kernel source. */ 1833 arm_linux_record_tdep.size_pointer 1834 = gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT; 1835 arm_linux_record_tdep.size__old_kernel_stat = 32; 1836 arm_linux_record_tdep.size_tms = 16; 1837 arm_linux_record_tdep.size_loff_t = 8; 1838 arm_linux_record_tdep.size_flock = 16; 1839 arm_linux_record_tdep.size_oldold_utsname = 45; 1840 arm_linux_record_tdep.size_ustat = 20; 1841 arm_linux_record_tdep.size_old_sigaction = 16; 1842 arm_linux_record_tdep.size_old_sigset_t = 4; 1843 arm_linux_record_tdep.size_rlimit = 8; 1844 arm_linux_record_tdep.size_rusage = 72; 1845 arm_linux_record_tdep.size_timeval = 8; 1846 arm_linux_record_tdep.size_timezone = 8; 1847 arm_linux_record_tdep.size_old_gid_t = 2; 1848 arm_linux_record_tdep.size_old_uid_t = 2; 1849 arm_linux_record_tdep.size_fd_set = 128; 1850 arm_linux_record_tdep.size_old_dirent = 268; 1851 arm_linux_record_tdep.size_statfs = 64; 1852 arm_linux_record_tdep.size_statfs64 = 84; 1853 arm_linux_record_tdep.size_sockaddr = 16; 1854 arm_linux_record_tdep.size_int 1855 = gdbarch_int_bit (gdbarch) / TARGET_CHAR_BIT; 1856 arm_linux_record_tdep.size_long 1857 = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT; 1858 arm_linux_record_tdep.size_ulong 1859 = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT; 1860 arm_linux_record_tdep.size_msghdr = 28; 1861 arm_linux_record_tdep.size_itimerval = 16; 1862 arm_linux_record_tdep.size_stat = 88; 1863 arm_linux_record_tdep.size_old_utsname = 325; 1864 arm_linux_record_tdep.size_sysinfo = 64; 1865 arm_linux_record_tdep.size_msqid_ds = 88; 1866 arm_linux_record_tdep.size_shmid_ds = 84; 1867 arm_linux_record_tdep.size_new_utsname = 390; 1868 arm_linux_record_tdep.size_timex = 128; 1869 arm_linux_record_tdep.size_mem_dqinfo = 24; 1870 arm_linux_record_tdep.size_if_dqblk = 68; 1871 arm_linux_record_tdep.size_fs_quota_stat = 68; 1872 arm_linux_record_tdep.size_timespec = 8; 1873 arm_linux_record_tdep.size_pollfd = 8; 1874 arm_linux_record_tdep.size_NFS_FHSIZE = 32; 1875 arm_linux_record_tdep.size_knfsd_fh = 132; 1876 arm_linux_record_tdep.size_TASK_COMM_LEN = 16; 1877 arm_linux_record_tdep.size_sigaction = 20; 1878 arm_linux_record_tdep.size_sigset_t = 8; 1879 arm_linux_record_tdep.size_siginfo_t = 128; 1880 arm_linux_record_tdep.size_cap_user_data_t = 12; 1881 arm_linux_record_tdep.size_stack_t = 12; 1882 arm_linux_record_tdep.size_off_t = arm_linux_record_tdep.size_long; 1883 arm_linux_record_tdep.size_stat64 = 96; 1884 arm_linux_record_tdep.size_gid_t = 4; 1885 arm_linux_record_tdep.size_uid_t = 4; 1886 arm_linux_record_tdep.size_PAGE_SIZE = 4096; 1887 arm_linux_record_tdep.size_flock64 = 24; 1888 arm_linux_record_tdep.size_user_desc = 16; 1889 arm_linux_record_tdep.size_io_event = 32; 1890 arm_linux_record_tdep.size_iocb = 64; 1891 arm_linux_record_tdep.size_epoll_event = 12; 1892 arm_linux_record_tdep.size_itimerspec 1893 = arm_linux_record_tdep.size_timespec * 2; 1894 arm_linux_record_tdep.size_mq_attr = 32; 1895 arm_linux_record_tdep.size_termios = 36; 1896 arm_linux_record_tdep.size_termios2 = 44; 1897 arm_linux_record_tdep.size_pid_t = 4; 1898 arm_linux_record_tdep.size_winsize = 8; 1899 arm_linux_record_tdep.size_serial_struct = 60; 1900 arm_linux_record_tdep.size_serial_icounter_struct = 80; 1901 arm_linux_record_tdep.size_hayes_esp_config = 12; 1902 arm_linux_record_tdep.size_size_t = 4; 1903 arm_linux_record_tdep.size_iovec = 8; 1904 arm_linux_record_tdep.size_time_t = 4; 1905 1906 /* These values are the second argument of system call "sys_ioctl". 1907 They are obtained from Linux Kernel source. */ 1908 arm_linux_record_tdep.ioctl_TCGETS = 0x5401; 1909 arm_linux_record_tdep.ioctl_TCSETS = 0x5402; 1910 arm_linux_record_tdep.ioctl_TCSETSW = 0x5403; 1911 arm_linux_record_tdep.ioctl_TCSETSF = 0x5404; 1912 arm_linux_record_tdep.ioctl_TCGETA = 0x5405; 1913 arm_linux_record_tdep.ioctl_TCSETA = 0x5406; 1914 arm_linux_record_tdep.ioctl_TCSETAW = 0x5407; 1915 arm_linux_record_tdep.ioctl_TCSETAF = 0x5408; 1916 arm_linux_record_tdep.ioctl_TCSBRK = 0x5409; 1917 arm_linux_record_tdep.ioctl_TCXONC = 0x540a; 1918 arm_linux_record_tdep.ioctl_TCFLSH = 0x540b; 1919 arm_linux_record_tdep.ioctl_TIOCEXCL = 0x540c; 1920 arm_linux_record_tdep.ioctl_TIOCNXCL = 0x540d; 1921 arm_linux_record_tdep.ioctl_TIOCSCTTY = 0x540e; 1922 arm_linux_record_tdep.ioctl_TIOCGPGRP = 0x540f; 1923 arm_linux_record_tdep.ioctl_TIOCSPGRP = 0x5410; 1924 arm_linux_record_tdep.ioctl_TIOCOUTQ = 0x5411; 1925 arm_linux_record_tdep.ioctl_TIOCSTI = 0x5412; 1926 arm_linux_record_tdep.ioctl_TIOCGWINSZ = 0x5413; 1927 arm_linux_record_tdep.ioctl_TIOCSWINSZ = 0x5414; 1928 arm_linux_record_tdep.ioctl_TIOCMGET = 0x5415; 1929 arm_linux_record_tdep.ioctl_TIOCMBIS = 0x5416; 1930 arm_linux_record_tdep.ioctl_TIOCMBIC = 0x5417; 1931 arm_linux_record_tdep.ioctl_TIOCMSET = 0x5418; 1932 arm_linux_record_tdep.ioctl_TIOCGSOFTCAR = 0x5419; 1933 arm_linux_record_tdep.ioctl_TIOCSSOFTCAR = 0x541a; 1934 arm_linux_record_tdep.ioctl_FIONREAD = 0x541b; 1935 arm_linux_record_tdep.ioctl_TIOCINQ = arm_linux_record_tdep.ioctl_FIONREAD; 1936 arm_linux_record_tdep.ioctl_TIOCLINUX = 0x541c; 1937 arm_linux_record_tdep.ioctl_TIOCCONS = 0x541d; 1938 arm_linux_record_tdep.ioctl_TIOCGSERIAL = 0x541e; 1939 arm_linux_record_tdep.ioctl_TIOCSSERIAL = 0x541f; 1940 arm_linux_record_tdep.ioctl_TIOCPKT = 0x5420; 1941 arm_linux_record_tdep.ioctl_FIONBIO = 0x5421; 1942 arm_linux_record_tdep.ioctl_TIOCNOTTY = 0x5422; 1943 arm_linux_record_tdep.ioctl_TIOCSETD = 0x5423; 1944 arm_linux_record_tdep.ioctl_TIOCGETD = 0x5424; 1945 arm_linux_record_tdep.ioctl_TCSBRKP = 0x5425; 1946 arm_linux_record_tdep.ioctl_TIOCTTYGSTRUCT = 0x5426; 1947 arm_linux_record_tdep.ioctl_TIOCSBRK = 0x5427; 1948 arm_linux_record_tdep.ioctl_TIOCCBRK = 0x5428; 1949 arm_linux_record_tdep.ioctl_TIOCGSID = 0x5429; 1950 arm_linux_record_tdep.ioctl_TCGETS2 = 0x802c542a; 1951 arm_linux_record_tdep.ioctl_TCSETS2 = 0x402c542b; 1952 arm_linux_record_tdep.ioctl_TCSETSW2 = 0x402c542c; 1953 arm_linux_record_tdep.ioctl_TCSETSF2 = 0x402c542d; 1954 arm_linux_record_tdep.ioctl_TIOCGPTN = 0x80045430; 1955 arm_linux_record_tdep.ioctl_TIOCSPTLCK = 0x40045431; 1956 arm_linux_record_tdep.ioctl_FIONCLEX = 0x5450; 1957 arm_linux_record_tdep.ioctl_FIOCLEX = 0x5451; 1958 arm_linux_record_tdep.ioctl_FIOASYNC = 0x5452; 1959 arm_linux_record_tdep.ioctl_TIOCSERCONFIG = 0x5453; 1960 arm_linux_record_tdep.ioctl_TIOCSERGWILD = 0x5454; 1961 arm_linux_record_tdep.ioctl_TIOCSERSWILD = 0x5455; 1962 arm_linux_record_tdep.ioctl_TIOCGLCKTRMIOS = 0x5456; 1963 arm_linux_record_tdep.ioctl_TIOCSLCKTRMIOS = 0x5457; 1964 arm_linux_record_tdep.ioctl_TIOCSERGSTRUCT = 0x5458; 1965 arm_linux_record_tdep.ioctl_TIOCSERGETLSR = 0x5459; 1966 arm_linux_record_tdep.ioctl_TIOCSERGETMULTI = 0x545a; 1967 arm_linux_record_tdep.ioctl_TIOCSERSETMULTI = 0x545b; 1968 arm_linux_record_tdep.ioctl_TIOCMIWAIT = 0x545c; 1969 arm_linux_record_tdep.ioctl_TIOCGICOUNT = 0x545d; 1970 arm_linux_record_tdep.ioctl_TIOCGHAYESESP = 0x545e; 1971 arm_linux_record_tdep.ioctl_TIOCSHAYESESP = 0x545f; 1972 arm_linux_record_tdep.ioctl_FIOQSIZE = 0x5460; 1973 1974 /* These values are the second argument of system call "sys_fcntl" 1975 and "sys_fcntl64". They are obtained from Linux Kernel source. */ 1976 arm_linux_record_tdep.fcntl_F_GETLK = 5; 1977 arm_linux_record_tdep.fcntl_F_GETLK64 = 12; 1978 arm_linux_record_tdep.fcntl_F_SETLK64 = 13; 1979 arm_linux_record_tdep.fcntl_F_SETLKW64 = 14; 1980 1981 arm_linux_record_tdep.arg1 = ARM_A1_REGNUM; 1982 arm_linux_record_tdep.arg2 = ARM_A1_REGNUM + 1; 1983 arm_linux_record_tdep.arg3 = ARM_A1_REGNUM + 2; 1984 arm_linux_record_tdep.arg4 = ARM_A1_REGNUM + 3; 1985 arm_linux_record_tdep.arg5 = ARM_A1_REGNUM + 4; 1986 arm_linux_record_tdep.arg6 = ARM_A1_REGNUM + 5; 1987 arm_linux_record_tdep.arg7 = ARM_A1_REGNUM + 6; 1988 1989 set_gdbarch_gcc_target_options (gdbarch, arm_linux_gcc_target_options); 1990 } 1991 1992 void _initialize_arm_linux_tdep (); 1993 void 1994 _initialize_arm_linux_tdep () 1995 { 1996 gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_LINUX, 1997 arm_linux_init_abi); 1998 } 1999