| 1 | /* Target-dependent code for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986-2015 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 "frame.h" |
| 22 | #include "inferior.h" |
| 23 | #include "symtab.h" |
| 24 | #include "target.h" |
| 25 | #include "gdbcore.h" |
| 26 | #include "gdbcmd.h" |
| 27 | #include "symfile.h" |
| 28 | #include "objfiles.h" |
| 29 | #include "regcache.h" |
| 30 | #include "value.h" |
| 31 | #include "osabi.h" |
| 32 | #include "regset.h" |
| 33 | #include "solib-svr4.h" |
| 34 | #include "solib-spu.h" |
| 35 | #include "solib.h" |
| 36 | #include "solist.h" |
| 37 | #include "ppc-tdep.h" |
| 38 | #include "ppc64-tdep.h" |
| 39 | #include "ppc-linux-tdep.h" |
| 40 | #include "glibc-tdep.h" |
| 41 | #include "trad-frame.h" |
| 42 | #include "frame-unwind.h" |
| 43 | #include "tramp-frame.h" |
| 44 | #include "observer.h" |
| 45 | #include "auxv.h" |
| 46 | #include "elf/common.h" |
| 47 | #include "elf/ppc64.h" |
| 48 | #include "arch-utils.h" |
| 49 | #include "spu-tdep.h" |
| 50 | #include "xml-syscall.h" |
| 51 | #include "linux-tdep.h" |
| 52 | #include "linux-record.h" |
| 53 | #include "record-full.h" |
| 54 | #include "infrun.h" |
| 55 | |
| 56 | #include "stap-probe.h" |
| 57 | #include "ax.h" |
| 58 | #include "ax-gdb.h" |
| 59 | #include "cli/cli-utils.h" |
| 60 | #include "parser-defs.h" |
| 61 | #include "user-regs.h" |
| 62 | #include <ctype.h> |
| 63 | #include "elf-bfd.h" /* for elfcore_write_* */ |
| 64 | |
| 65 | #include "features/rs6000/powerpc-32l.c" |
| 66 | #include "features/rs6000/powerpc-altivec32l.c" |
| 67 | #include "features/rs6000/powerpc-cell32l.c" |
| 68 | #include "features/rs6000/powerpc-vsx32l.c" |
| 69 | #include "features/rs6000/powerpc-isa205-32l.c" |
| 70 | #include "features/rs6000/powerpc-isa205-altivec32l.c" |
| 71 | #include "features/rs6000/powerpc-isa205-vsx32l.c" |
| 72 | #include "features/rs6000/powerpc-64l.c" |
| 73 | #include "features/rs6000/powerpc-altivec64l.c" |
| 74 | #include "features/rs6000/powerpc-cell64l.c" |
| 75 | #include "features/rs6000/powerpc-vsx64l.c" |
| 76 | #include "features/rs6000/powerpc-isa205-64l.c" |
| 77 | #include "features/rs6000/powerpc-isa205-altivec64l.c" |
| 78 | #include "features/rs6000/powerpc-isa205-vsx64l.c" |
| 79 | #include "features/rs6000/powerpc-e500l.c" |
| 80 | |
| 81 | /* Shared library operations for PowerPC-Linux. */ |
| 82 | static struct target_so_ops powerpc_so_ops; |
| 83 | |
| 84 | /* The syscall's XML filename for PPC and PPC64. */ |
| 85 | #define XML_SYSCALL_FILENAME_PPC "syscalls/ppc-linux.xml" |
| 86 | #define XML_SYSCALL_FILENAME_PPC64 "syscalls/ppc64-linux.xml" |
| 87 | |
| 88 | /* ppc_linux_memory_remove_breakpoints attempts to remove a breakpoint |
| 89 | in much the same fashion as memory_remove_breakpoint in mem-break.c, |
| 90 | but is careful not to write back the previous contents if the code |
| 91 | in question has changed in between inserting the breakpoint and |
| 92 | removing it. |
| 93 | |
| 94 | Here is the problem that we're trying to solve... |
| 95 | |
| 96 | Once upon a time, before introducing this function to remove |
| 97 | breakpoints from the inferior, setting a breakpoint on a shared |
| 98 | library function prior to running the program would not work |
| 99 | properly. In order to understand the problem, it is first |
| 100 | necessary to understand a little bit about dynamic linking on |
| 101 | this platform. |
| 102 | |
| 103 | A call to a shared library function is accomplished via a bl |
| 104 | (branch-and-link) instruction whose branch target is an entry |
| 105 | in the procedure linkage table (PLT). The PLT in the object |
| 106 | file is uninitialized. To gdb, prior to running the program, the |
| 107 | entries in the PLT are all zeros. |
| 108 | |
| 109 | Once the program starts running, the shared libraries are loaded |
| 110 | and the procedure linkage table is initialized, but the entries in |
| 111 | the table are not (necessarily) resolved. Once a function is |
| 112 | actually called, the code in the PLT is hit and the function is |
| 113 | resolved. In order to better illustrate this, an example is in |
| 114 | order; the following example is from the gdb testsuite. |
| 115 | |
| 116 | We start the program shmain. |
| 117 | |
| 118 | [kev@arroyo testsuite]$ ../gdb gdb.base/shmain |
| 119 | [...] |
| 120 | |
| 121 | We place two breakpoints, one on shr1 and the other on main. |
| 122 | |
| 123 | (gdb) b shr1 |
| 124 | Breakpoint 1 at 0x100409d4 |
| 125 | (gdb) b main |
| 126 | Breakpoint 2 at 0x100006a0: file gdb.base/shmain.c, line 44. |
| 127 | |
| 128 | Examine the instruction (and the immediatly following instruction) |
| 129 | upon which the breakpoint was placed. Note that the PLT entry |
| 130 | for shr1 contains zeros. |
| 131 | |
| 132 | (gdb) x/2i 0x100409d4 |
| 133 | 0x100409d4 <shr1>: .long 0x0 |
| 134 | 0x100409d8 <shr1+4>: .long 0x0 |
| 135 | |
| 136 | Now run 'til main. |
| 137 | |
| 138 | (gdb) r |
| 139 | Starting program: gdb.base/shmain |
| 140 | Breakpoint 1 at 0xffaf790: file gdb.base/shr1.c, line 19. |
| 141 | |
| 142 | Breakpoint 2, main () |
| 143 | at gdb.base/shmain.c:44 |
| 144 | 44 g = 1; |
| 145 | |
| 146 | Examine the PLT again. Note that the loading of the shared |
| 147 | library has initialized the PLT to code which loads a constant |
| 148 | (which I think is an index into the GOT) into r11 and then |
| 149 | branchs a short distance to the code which actually does the |
| 150 | resolving. |
| 151 | |
| 152 | (gdb) x/2i 0x100409d4 |
| 153 | 0x100409d4 <shr1>: li r11,4 |
| 154 | 0x100409d8 <shr1+4>: b 0x10040984 <sg+4> |
| 155 | (gdb) c |
| 156 | Continuing. |
| 157 | |
| 158 | Breakpoint 1, shr1 (x=1) |
| 159 | at gdb.base/shr1.c:19 |
| 160 | 19 l = 1; |
| 161 | |
| 162 | Now we've hit the breakpoint at shr1. (The breakpoint was |
| 163 | reset from the PLT entry to the actual shr1 function after the |
| 164 | shared library was loaded.) Note that the PLT entry has been |
| 165 | resolved to contain a branch that takes us directly to shr1. |
| 166 | (The real one, not the PLT entry.) |
| 167 | |
| 168 | (gdb) x/2i 0x100409d4 |
| 169 | 0x100409d4 <shr1>: b 0xffaf76c <shr1> |
| 170 | 0x100409d8 <shr1+4>: b 0x10040984 <sg+4> |
| 171 | |
| 172 | The thing to note here is that the PLT entry for shr1 has been |
| 173 | changed twice. |
| 174 | |
| 175 | Now the problem should be obvious. GDB places a breakpoint (a |
| 176 | trap instruction) on the zero value of the PLT entry for shr1. |
| 177 | Later on, after the shared library had been loaded and the PLT |
| 178 | initialized, GDB gets a signal indicating this fact and attempts |
| 179 | (as it always does when it stops) to remove all the breakpoints. |
| 180 | |
| 181 | The breakpoint removal was causing the former contents (a zero |
| 182 | word) to be written back to the now initialized PLT entry thus |
| 183 | destroying a portion of the initialization that had occurred only a |
| 184 | short time ago. When execution continued, the zero word would be |
| 185 | executed as an instruction an illegal instruction trap was |
| 186 | generated instead. (0 is not a legal instruction.) |
| 187 | |
| 188 | The fix for this problem was fairly straightforward. The function |
| 189 | memory_remove_breakpoint from mem-break.c was copied to this file, |
| 190 | modified slightly, and renamed to ppc_linux_memory_remove_breakpoint. |
| 191 | In tm-linux.h, MEMORY_REMOVE_BREAKPOINT is defined to call this new |
| 192 | function. |
| 193 | |
| 194 | The differences between ppc_linux_memory_remove_breakpoint () and |
| 195 | memory_remove_breakpoint () are minor. All that the former does |
| 196 | that the latter does not is check to make sure that the breakpoint |
| 197 | location actually contains a breakpoint (trap instruction) prior |
| 198 | to attempting to write back the old contents. If it does contain |
| 199 | a trap instruction, we allow the old contents to be written back. |
| 200 | Otherwise, we silently do nothing. |
| 201 | |
| 202 | The big question is whether memory_remove_breakpoint () should be |
| 203 | changed to have the same functionality. The downside is that more |
| 204 | traffic is generated for remote targets since we'll have an extra |
| 205 | fetch of a memory word each time a breakpoint is removed. |
| 206 | |
| 207 | For the time being, we'll leave this self-modifying-code-friendly |
| 208 | version in ppc-linux-tdep.c, but it ought to be migrated somewhere |
| 209 | else in the event that some other platform has similar needs with |
| 210 | regard to removing breakpoints in some potentially self modifying |
| 211 | code. */ |
| 212 | static int |
| 213 | ppc_linux_memory_remove_breakpoint (struct gdbarch *gdbarch, |
| 214 | struct bp_target_info *bp_tgt) |
| 215 | { |
| 216 | CORE_ADDR addr = bp_tgt->reqstd_address; |
| 217 | const unsigned char *bp; |
| 218 | int val; |
| 219 | int bplen; |
| 220 | gdb_byte old_contents[BREAKPOINT_MAX]; |
| 221 | struct cleanup *cleanup; |
| 222 | |
| 223 | /* Determine appropriate breakpoint contents and size for this address. */ |
| 224 | bp = gdbarch_breakpoint_from_pc (gdbarch, &addr, &bplen); |
| 225 | if (bp == NULL) |
| 226 | error (_("Software breakpoints not implemented for this target.")); |
| 227 | |
| 228 | /* Make sure we see the memory breakpoints. */ |
| 229 | cleanup = make_show_memory_breakpoints_cleanup (1); |
| 230 | val = target_read_memory (addr, old_contents, bplen); |
| 231 | |
| 232 | /* If our breakpoint is no longer at the address, this means that the |
| 233 | program modified the code on us, so it is wrong to put back the |
| 234 | old value. */ |
| 235 | if (val == 0 && memcmp (bp, old_contents, bplen) == 0) |
| 236 | val = target_write_raw_memory (addr, bp_tgt->shadow_contents, bplen); |
| 237 | |
| 238 | do_cleanups (cleanup); |
| 239 | return val; |
| 240 | } |
| 241 | |
| 242 | /* For historic reasons, PPC 32 GNU/Linux follows PowerOpen rather |
| 243 | than the 32 bit SYSV R4 ABI structure return convention - all |
| 244 | structures, no matter their size, are put in memory. Vectors, |
| 245 | which were added later, do get returned in a register though. */ |
| 246 | |
| 247 | static enum return_value_convention |
| 248 | ppc_linux_return_value (struct gdbarch *gdbarch, struct value *function, |
| 249 | struct type *valtype, struct regcache *regcache, |
| 250 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 251 | { |
| 252 | if ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT |
| 253 | || TYPE_CODE (valtype) == TYPE_CODE_UNION) |
| 254 | && !((TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 8) |
| 255 | && TYPE_VECTOR (valtype))) |
| 256 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 257 | else |
| 258 | return ppc_sysv_abi_return_value (gdbarch, function, valtype, regcache, |
| 259 | readbuf, writebuf); |
| 260 | } |
| 261 | |
| 262 | /* PLT stub in executable. */ |
| 263 | static struct ppc_insn_pattern powerpc32_plt_stub[] = |
| 264 | { |
| 265 | { 0xffff0000, 0x3d600000, 0 }, /* lis r11, xxxx */ |
| 266 | { 0xffff0000, 0x816b0000, 0 }, /* lwz r11, xxxx(r11) */ |
| 267 | { 0xffffffff, 0x7d6903a6, 0 }, /* mtctr r11 */ |
| 268 | { 0xffffffff, 0x4e800420, 0 }, /* bctr */ |
| 269 | { 0, 0, 0 } |
| 270 | }; |
| 271 | |
| 272 | /* PLT stub in shared library. */ |
| 273 | static struct ppc_insn_pattern powerpc32_plt_stub_so[] = |
| 274 | { |
| 275 | { 0xffff0000, 0x817e0000, 0 }, /* lwz r11, xxxx(r30) */ |
| 276 | { 0xffffffff, 0x7d6903a6, 0 }, /* mtctr r11 */ |
| 277 | { 0xffffffff, 0x4e800420, 0 }, /* bctr */ |
| 278 | { 0xffffffff, 0x60000000, 0 }, /* nop */ |
| 279 | { 0, 0, 0 } |
| 280 | }; |
| 281 | #define POWERPC32_PLT_STUB_LEN ARRAY_SIZE (powerpc32_plt_stub) |
| 282 | |
| 283 | /* Check if PC is in PLT stub. For non-secure PLT, stub is in .plt |
| 284 | section. For secure PLT, stub is in .text and we need to check |
| 285 | instruction patterns. */ |
| 286 | |
| 287 | static int |
| 288 | powerpc_linux_in_dynsym_resolve_code (CORE_ADDR pc) |
| 289 | { |
| 290 | struct bound_minimal_symbol sym; |
| 291 | |
| 292 | /* Check whether PC is in the dynamic linker. This also checks |
| 293 | whether it is in the .plt section, used by non-PIC executables. */ |
| 294 | if (svr4_in_dynsym_resolve_code (pc)) |
| 295 | return 1; |
| 296 | |
| 297 | /* Check if we are in the resolver. */ |
| 298 | sym = lookup_minimal_symbol_by_pc (pc); |
| 299 | if (sym.minsym != NULL |
| 300 | && (strcmp (MSYMBOL_LINKAGE_NAME (sym.minsym), "__glink") == 0 |
| 301 | || strcmp (MSYMBOL_LINKAGE_NAME (sym.minsym), |
| 302 | "__glink_PLTresolve") == 0)) |
| 303 | return 1; |
| 304 | |
| 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | /* Follow PLT stub to actual routine. |
| 309 | |
| 310 | When the execution direction is EXEC_REVERSE, scan backward to |
| 311 | check whether we are in the middle of a PLT stub. Currently, |
| 312 | we only look-behind at most 4 instructions (the max length of PLT |
| 313 | stub sequence. */ |
| 314 | |
| 315 | static CORE_ADDR |
| 316 | ppc_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
| 317 | { |
| 318 | unsigned int insnbuf[POWERPC32_PLT_STUB_LEN]; |
| 319 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 320 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 321 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 322 | CORE_ADDR target = 0; |
| 323 | int scan_limit, i; |
| 324 | |
| 325 | scan_limit = 1; |
| 326 | /* When reverse-debugging, scan backward to check whether we are |
| 327 | in the middle of trampoline code. */ |
| 328 | if (execution_direction == EXEC_REVERSE) |
| 329 | scan_limit = 4; /* At more 4 instructions. */ |
| 330 | |
| 331 | for (i = 0; i < scan_limit; i++) |
| 332 | { |
| 333 | if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub, insnbuf)) |
| 334 | { |
| 335 | /* Insn pattern is |
| 336 | lis r11, xxxx |
| 337 | lwz r11, xxxx(r11) |
| 338 | Branch target is in r11. */ |
| 339 | |
| 340 | target = (ppc_insn_d_field (insnbuf[0]) << 16) |
| 341 | | ppc_insn_d_field (insnbuf[1]); |
| 342 | target = read_memory_unsigned_integer (target, 4, byte_order); |
| 343 | } |
| 344 | else if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub_so, |
| 345 | insnbuf)) |
| 346 | { |
| 347 | /* Insn pattern is |
| 348 | lwz r11, xxxx(r30) |
| 349 | Branch target is in r11. */ |
| 350 | |
| 351 | target = get_frame_register_unsigned (frame, |
| 352 | tdep->ppc_gp0_regnum + 30) |
| 353 | + ppc_insn_d_field (insnbuf[0]); |
| 354 | target = read_memory_unsigned_integer (target, 4, byte_order); |
| 355 | } |
| 356 | else |
| 357 | { |
| 358 | /* Scan backward one more instructions if doesn't match. */ |
| 359 | pc -= 4; |
| 360 | continue; |
| 361 | } |
| 362 | |
| 363 | return target; |
| 364 | } |
| 365 | |
| 366 | return 0; |
| 367 | } |
| 368 | |
| 369 | /* Wrappers to handle Linux-only registers. */ |
| 370 | |
| 371 | static void |
| 372 | ppc_linux_supply_gregset (const struct regset *regset, |
| 373 | struct regcache *regcache, |
| 374 | int regnum, const void *gregs, size_t len) |
| 375 | { |
| 376 | const struct ppc_reg_offsets *offsets = regset->regmap; |
| 377 | |
| 378 | ppc_supply_gregset (regset, regcache, regnum, gregs, len); |
| 379 | |
| 380 | if (ppc_linux_trap_reg_p (get_regcache_arch (regcache))) |
| 381 | { |
| 382 | /* "orig_r3" is stored 2 slots after "pc". */ |
| 383 | if (regnum == -1 || regnum == PPC_ORIG_R3_REGNUM) |
| 384 | ppc_supply_reg (regcache, PPC_ORIG_R3_REGNUM, gregs, |
| 385 | offsets->pc_offset + 2 * offsets->gpr_size, |
| 386 | offsets->gpr_size); |
| 387 | |
| 388 | /* "trap" is stored 8 slots after "pc". */ |
| 389 | if (regnum == -1 || regnum == PPC_TRAP_REGNUM) |
| 390 | ppc_supply_reg (regcache, PPC_TRAP_REGNUM, gregs, |
| 391 | offsets->pc_offset + 8 * offsets->gpr_size, |
| 392 | offsets->gpr_size); |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | static void |
| 397 | ppc_linux_collect_gregset (const struct regset *regset, |
| 398 | const struct regcache *regcache, |
| 399 | int regnum, void *gregs, size_t len) |
| 400 | { |
| 401 | const struct ppc_reg_offsets *offsets = regset->regmap; |
| 402 | |
| 403 | /* Clear areas in the linux gregset not written elsewhere. */ |
| 404 | if (regnum == -1) |
| 405 | memset (gregs, 0, len); |
| 406 | |
| 407 | ppc_collect_gregset (regset, regcache, regnum, gregs, len); |
| 408 | |
| 409 | if (ppc_linux_trap_reg_p (get_regcache_arch (regcache))) |
| 410 | { |
| 411 | /* "orig_r3" is stored 2 slots after "pc". */ |
| 412 | if (regnum == -1 || regnum == PPC_ORIG_R3_REGNUM) |
| 413 | ppc_collect_reg (regcache, PPC_ORIG_R3_REGNUM, gregs, |
| 414 | offsets->pc_offset + 2 * offsets->gpr_size, |
| 415 | offsets->gpr_size); |
| 416 | |
| 417 | /* "trap" is stored 8 slots after "pc". */ |
| 418 | if (regnum == -1 || regnum == PPC_TRAP_REGNUM) |
| 419 | ppc_collect_reg (regcache, PPC_TRAP_REGNUM, gregs, |
| 420 | offsets->pc_offset + 8 * offsets->gpr_size, |
| 421 | offsets->gpr_size); |
| 422 | } |
| 423 | } |
| 424 | |
| 425 | /* Regset descriptions. */ |
| 426 | static const struct ppc_reg_offsets ppc32_linux_reg_offsets = |
| 427 | { |
| 428 | /* General-purpose registers. */ |
| 429 | /* .r0_offset = */ 0, |
| 430 | /* .gpr_size = */ 4, |
| 431 | /* .xr_size = */ 4, |
| 432 | /* .pc_offset = */ 128, |
| 433 | /* .ps_offset = */ 132, |
| 434 | /* .cr_offset = */ 152, |
| 435 | /* .lr_offset = */ 144, |
| 436 | /* .ctr_offset = */ 140, |
| 437 | /* .xer_offset = */ 148, |
| 438 | /* .mq_offset = */ 156, |
| 439 | |
| 440 | /* Floating-point registers. */ |
| 441 | /* .f0_offset = */ 0, |
| 442 | /* .fpscr_offset = */ 256, |
| 443 | /* .fpscr_size = */ 8, |
| 444 | |
| 445 | /* AltiVec registers. */ |
| 446 | /* .vr0_offset = */ 0, |
| 447 | /* .vscr_offset = */ 512 + 12, |
| 448 | /* .vrsave_offset = */ 528 |
| 449 | }; |
| 450 | |
| 451 | static const struct ppc_reg_offsets ppc64_linux_reg_offsets = |
| 452 | { |
| 453 | /* General-purpose registers. */ |
| 454 | /* .r0_offset = */ 0, |
| 455 | /* .gpr_size = */ 8, |
| 456 | /* .xr_size = */ 8, |
| 457 | /* .pc_offset = */ 256, |
| 458 | /* .ps_offset = */ 264, |
| 459 | /* .cr_offset = */ 304, |
| 460 | /* .lr_offset = */ 288, |
| 461 | /* .ctr_offset = */ 280, |
| 462 | /* .xer_offset = */ 296, |
| 463 | /* .mq_offset = */ 312, |
| 464 | |
| 465 | /* Floating-point registers. */ |
| 466 | /* .f0_offset = */ 0, |
| 467 | /* .fpscr_offset = */ 256, |
| 468 | /* .fpscr_size = */ 8, |
| 469 | |
| 470 | /* AltiVec registers. */ |
| 471 | /* .vr0_offset = */ 0, |
| 472 | /* .vscr_offset = */ 512 + 12, |
| 473 | /* .vrsave_offset = */ 528 |
| 474 | }; |
| 475 | |
| 476 | static const struct regset ppc32_linux_gregset = { |
| 477 | &ppc32_linux_reg_offsets, |
| 478 | ppc_linux_supply_gregset, |
| 479 | ppc_linux_collect_gregset |
| 480 | }; |
| 481 | |
| 482 | static const struct regset ppc64_linux_gregset = { |
| 483 | &ppc64_linux_reg_offsets, |
| 484 | ppc_linux_supply_gregset, |
| 485 | ppc_linux_collect_gregset |
| 486 | }; |
| 487 | |
| 488 | static const struct regset ppc32_linux_fpregset = { |
| 489 | &ppc32_linux_reg_offsets, |
| 490 | ppc_supply_fpregset, |
| 491 | ppc_collect_fpregset |
| 492 | }; |
| 493 | |
| 494 | static const struct regset ppc32_linux_vrregset = { |
| 495 | &ppc32_linux_reg_offsets, |
| 496 | ppc_supply_vrregset, |
| 497 | ppc_collect_vrregset |
| 498 | }; |
| 499 | |
| 500 | static const struct regset ppc32_linux_vsxregset = { |
| 501 | &ppc32_linux_reg_offsets, |
| 502 | ppc_supply_vsxregset, |
| 503 | ppc_collect_vsxregset |
| 504 | }; |
| 505 | |
| 506 | const struct regset * |
| 507 | ppc_linux_gregset (int wordsize) |
| 508 | { |
| 509 | return wordsize == 8 ? &ppc64_linux_gregset : &ppc32_linux_gregset; |
| 510 | } |
| 511 | |
| 512 | const struct regset * |
| 513 | ppc_linux_fpregset (void) |
| 514 | { |
| 515 | return &ppc32_linux_fpregset; |
| 516 | } |
| 517 | |
| 518 | /* Iterate over supported core file register note sections. */ |
| 519 | |
| 520 | static void |
| 521 | ppc_linux_iterate_over_regset_sections (struct gdbarch *gdbarch, |
| 522 | iterate_over_regset_sections_cb *cb, |
| 523 | void *cb_data, |
| 524 | const struct regcache *regcache) |
| 525 | { |
| 526 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 527 | int have_altivec = tdep->ppc_vr0_regnum != -1; |
| 528 | int have_vsx = tdep->ppc_vsr0_upper_regnum != -1; |
| 529 | |
| 530 | if (tdep->wordsize == 4) |
| 531 | cb (".reg", 48 * 4, &ppc32_linux_gregset, NULL, cb_data); |
| 532 | else |
| 533 | cb (".reg", 48 * 8, &ppc64_linux_gregset, NULL, cb_data); |
| 534 | |
| 535 | cb (".reg2", 264, &ppc32_linux_fpregset, NULL, cb_data); |
| 536 | |
| 537 | if (have_altivec) |
| 538 | cb (".reg-ppc-vmx", 544, &ppc32_linux_vrregset, "ppc Altivec", cb_data); |
| 539 | |
| 540 | if (have_vsx) |
| 541 | cb (".reg-ppc-vsx", 256, &ppc32_linux_vsxregset, "POWER7 VSX", cb_data); |
| 542 | } |
| 543 | |
| 544 | static void |
| 545 | ppc_linux_sigtramp_cache (struct frame_info *this_frame, |
| 546 | struct trad_frame_cache *this_cache, |
| 547 | CORE_ADDR func, LONGEST offset, |
| 548 | int bias) |
| 549 | { |
| 550 | CORE_ADDR base; |
| 551 | CORE_ADDR regs; |
| 552 | CORE_ADDR gpregs; |
| 553 | CORE_ADDR fpregs; |
| 554 | int i; |
| 555 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 556 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 557 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 558 | |
| 559 | base = get_frame_register_unsigned (this_frame, |
| 560 | gdbarch_sp_regnum (gdbarch)); |
| 561 | if (bias > 0 && get_frame_pc (this_frame) != func) |
| 562 | /* See below, some signal trampolines increment the stack as their |
| 563 | first instruction, need to compensate for that. */ |
| 564 | base -= bias; |
| 565 | |
| 566 | /* Find the address of the register buffer pointer. */ |
| 567 | regs = base + offset; |
| 568 | /* Use that to find the address of the corresponding register |
| 569 | buffers. */ |
| 570 | gpregs = read_memory_unsigned_integer (regs, tdep->wordsize, byte_order); |
| 571 | fpregs = gpregs + 48 * tdep->wordsize; |
| 572 | |
| 573 | /* General purpose. */ |
| 574 | for (i = 0; i < 32; i++) |
| 575 | { |
| 576 | int regnum = i + tdep->ppc_gp0_regnum; |
| 577 | trad_frame_set_reg_addr (this_cache, |
| 578 | regnum, gpregs + i * tdep->wordsize); |
| 579 | } |
| 580 | trad_frame_set_reg_addr (this_cache, |
| 581 | gdbarch_pc_regnum (gdbarch), |
| 582 | gpregs + 32 * tdep->wordsize); |
| 583 | trad_frame_set_reg_addr (this_cache, tdep->ppc_ctr_regnum, |
| 584 | gpregs + 35 * tdep->wordsize); |
| 585 | trad_frame_set_reg_addr (this_cache, tdep->ppc_lr_regnum, |
| 586 | gpregs + 36 * tdep->wordsize); |
| 587 | trad_frame_set_reg_addr (this_cache, tdep->ppc_xer_regnum, |
| 588 | gpregs + 37 * tdep->wordsize); |
| 589 | trad_frame_set_reg_addr (this_cache, tdep->ppc_cr_regnum, |
| 590 | gpregs + 38 * tdep->wordsize); |
| 591 | |
| 592 | if (ppc_linux_trap_reg_p (gdbarch)) |
| 593 | { |
| 594 | trad_frame_set_reg_addr (this_cache, PPC_ORIG_R3_REGNUM, |
| 595 | gpregs + 34 * tdep->wordsize); |
| 596 | trad_frame_set_reg_addr (this_cache, PPC_TRAP_REGNUM, |
| 597 | gpregs + 40 * tdep->wordsize); |
| 598 | } |
| 599 | |
| 600 | if (ppc_floating_point_unit_p (gdbarch)) |
| 601 | { |
| 602 | /* Floating point registers. */ |
| 603 | for (i = 0; i < 32; i++) |
| 604 | { |
| 605 | int regnum = i + gdbarch_fp0_regnum (gdbarch); |
| 606 | trad_frame_set_reg_addr (this_cache, regnum, |
| 607 | fpregs + i * tdep->wordsize); |
| 608 | } |
| 609 | trad_frame_set_reg_addr (this_cache, tdep->ppc_fpscr_regnum, |
| 610 | fpregs + 32 * tdep->wordsize); |
| 611 | } |
| 612 | trad_frame_set_id (this_cache, frame_id_build (base, func)); |
| 613 | } |
| 614 | |
| 615 | static void |
| 616 | ppc32_linux_sigaction_cache_init (const struct tramp_frame *self, |
| 617 | struct frame_info *this_frame, |
| 618 | struct trad_frame_cache *this_cache, |
| 619 | CORE_ADDR func) |
| 620 | { |
| 621 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
| 622 | 0xd0 /* Offset to ucontext_t. */ |
| 623 | + 0x30 /* Offset to .reg. */, |
| 624 | 0); |
| 625 | } |
| 626 | |
| 627 | static void |
| 628 | ppc64_linux_sigaction_cache_init (const struct tramp_frame *self, |
| 629 | struct frame_info *this_frame, |
| 630 | struct trad_frame_cache *this_cache, |
| 631 | CORE_ADDR func) |
| 632 | { |
| 633 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
| 634 | 0x80 /* Offset to ucontext_t. */ |
| 635 | + 0xe0 /* Offset to .reg. */, |
| 636 | 128); |
| 637 | } |
| 638 | |
| 639 | static void |
| 640 | ppc32_linux_sighandler_cache_init (const struct tramp_frame *self, |
| 641 | struct frame_info *this_frame, |
| 642 | struct trad_frame_cache *this_cache, |
| 643 | CORE_ADDR func) |
| 644 | { |
| 645 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
| 646 | 0x40 /* Offset to ucontext_t. */ |
| 647 | + 0x1c /* Offset to .reg. */, |
| 648 | 0); |
| 649 | } |
| 650 | |
| 651 | static void |
| 652 | ppc64_linux_sighandler_cache_init (const struct tramp_frame *self, |
| 653 | struct frame_info *this_frame, |
| 654 | struct trad_frame_cache *this_cache, |
| 655 | CORE_ADDR func) |
| 656 | { |
| 657 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
| 658 | 0x80 /* Offset to struct sigcontext. */ |
| 659 | + 0x38 /* Offset to .reg. */, |
| 660 | 128); |
| 661 | } |
| 662 | |
| 663 | static struct tramp_frame ppc32_linux_sigaction_tramp_frame = { |
| 664 | SIGTRAMP_FRAME, |
| 665 | 4, |
| 666 | { |
| 667 | { 0x380000ac, -1 }, /* li r0, 172 */ |
| 668 | { 0x44000002, -1 }, /* sc */ |
| 669 | { TRAMP_SENTINEL_INSN }, |
| 670 | }, |
| 671 | ppc32_linux_sigaction_cache_init |
| 672 | }; |
| 673 | static struct tramp_frame ppc64_linux_sigaction_tramp_frame = { |
| 674 | SIGTRAMP_FRAME, |
| 675 | 4, |
| 676 | { |
| 677 | { 0x38210080, -1 }, /* addi r1,r1,128 */ |
| 678 | { 0x380000ac, -1 }, /* li r0, 172 */ |
| 679 | { 0x44000002, -1 }, /* sc */ |
| 680 | { TRAMP_SENTINEL_INSN }, |
| 681 | }, |
| 682 | ppc64_linux_sigaction_cache_init |
| 683 | }; |
| 684 | static struct tramp_frame ppc32_linux_sighandler_tramp_frame = { |
| 685 | SIGTRAMP_FRAME, |
| 686 | 4, |
| 687 | { |
| 688 | { 0x38000077, -1 }, /* li r0,119 */ |
| 689 | { 0x44000002, -1 }, /* sc */ |
| 690 | { TRAMP_SENTINEL_INSN }, |
| 691 | }, |
| 692 | ppc32_linux_sighandler_cache_init |
| 693 | }; |
| 694 | static struct tramp_frame ppc64_linux_sighandler_tramp_frame = { |
| 695 | SIGTRAMP_FRAME, |
| 696 | 4, |
| 697 | { |
| 698 | { 0x38210080, -1 }, /* addi r1,r1,128 */ |
| 699 | { 0x38000077, -1 }, /* li r0,119 */ |
| 700 | { 0x44000002, -1 }, /* sc */ |
| 701 | { TRAMP_SENTINEL_INSN }, |
| 702 | }, |
| 703 | ppc64_linux_sighandler_cache_init |
| 704 | }; |
| 705 | |
| 706 | /* Return 1 if PPC_ORIG_R3_REGNUM and PPC_TRAP_REGNUM are usable. */ |
| 707 | int |
| 708 | ppc_linux_trap_reg_p (struct gdbarch *gdbarch) |
| 709 | { |
| 710 | /* If we do not have a target description with registers, then |
| 711 | the special registers will not be included in the register set. */ |
| 712 | if (!tdesc_has_registers (gdbarch_target_desc (gdbarch))) |
| 713 | return 0; |
| 714 | |
| 715 | /* If we do, then it is safe to check the size. */ |
| 716 | return register_size (gdbarch, PPC_ORIG_R3_REGNUM) > 0 |
| 717 | && register_size (gdbarch, PPC_TRAP_REGNUM) > 0; |
| 718 | } |
| 719 | |
| 720 | /* Return the current system call's number present in the |
| 721 | r0 register. When the function fails, it returns -1. */ |
| 722 | static LONGEST |
| 723 | ppc_linux_get_syscall_number (struct gdbarch *gdbarch, |
| 724 | ptid_t ptid) |
| 725 | { |
| 726 | struct regcache *regcache = get_thread_regcache (ptid); |
| 727 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 728 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 729 | struct cleanup *cleanbuf; |
| 730 | /* The content of a register */ |
| 731 | gdb_byte *buf; |
| 732 | /* The result */ |
| 733 | LONGEST ret; |
| 734 | |
| 735 | /* Make sure we're in a 32- or 64-bit machine */ |
| 736 | gdb_assert (tdep->wordsize == 4 || tdep->wordsize == 8); |
| 737 | |
| 738 | buf = (gdb_byte *) xmalloc (tdep->wordsize * sizeof (gdb_byte)); |
| 739 | |
| 740 | cleanbuf = make_cleanup (xfree, buf); |
| 741 | |
| 742 | /* Getting the system call number from the register. |
| 743 | When dealing with PowerPC architecture, this information |
| 744 | is stored at 0th register. */ |
| 745 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum, buf); |
| 746 | |
| 747 | ret = extract_signed_integer (buf, tdep->wordsize, byte_order); |
| 748 | do_cleanups (cleanbuf); |
| 749 | |
| 750 | return ret; |
| 751 | } |
| 752 | |
| 753 | /* PPC process record-replay */ |
| 754 | |
| 755 | static struct linux_record_tdep ppc_linux_record_tdep; |
| 756 | static struct linux_record_tdep ppc64_linux_record_tdep; |
| 757 | |
| 758 | /* ppc_canonicalize_syscall maps from the native PowerPC Linux set of |
| 759 | syscall ids into a canonical set of syscall ids used by process |
| 760 | record. (See arch/powerpc/include/uapi/asm/unistd.h in kernel tree.) |
| 761 | Return -1 if this system call is not supported by process record. |
| 762 | Otherwise, return the syscall number for preocess reocrd of given |
| 763 | SYSCALL. */ |
| 764 | |
| 765 | static enum gdb_syscall |
| 766 | ppc_canonicalize_syscall (int syscall) |
| 767 | { |
| 768 | int result = -1; |
| 769 | |
| 770 | if (syscall <= 165) |
| 771 | result = syscall; |
| 772 | else if (syscall >= 167 && syscall <= 190) /* Skip query_module 166 */ |
| 773 | result = syscall + 1; |
| 774 | else if (syscall >= 192 && syscall <= 197) /* mmap2 */ |
| 775 | result = syscall; |
| 776 | else if (syscall == 208) /* tkill */ |
| 777 | result = gdb_sys_tkill; |
| 778 | else if (syscall >= 207 && syscall <= 220) /* gettid */ |
| 779 | result = syscall + 224 - 207; |
| 780 | else if (syscall >= 234 && syscall <= 239) /* exit_group */ |
| 781 | result = syscall + 252 - 234; |
| 782 | else if (syscall >= 240 && syscall <= 248) /* timer_create */ |
| 783 | result = syscall += 259 - 240; |
| 784 | else if (syscall >= 250 && syscall <= 251) /* tgkill */ |
| 785 | result = syscall + 270 - 250; |
| 786 | else if (syscall == 336) |
| 787 | result = gdb_sys_recv; |
| 788 | else if (syscall == 337) |
| 789 | result = gdb_sys_recvfrom; |
| 790 | else if (syscall == 342) |
| 791 | result = gdb_sys_recvmsg; |
| 792 | |
| 793 | return (enum gdb_syscall) result; |
| 794 | } |
| 795 | |
| 796 | /* Record registers which might be clobbered during system call. |
| 797 | Return 0 if successful. */ |
| 798 | |
| 799 | static int |
| 800 | ppc_linux_syscall_record (struct regcache *regcache) |
| 801 | { |
| 802 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 803 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 804 | ULONGEST scnum; |
| 805 | enum gdb_syscall syscall_gdb; |
| 806 | int ret; |
| 807 | int i; |
| 808 | |
| 809 | regcache_raw_read_unsigned (regcache, tdep->ppc_gp0_regnum, &scnum); |
| 810 | syscall_gdb = ppc_canonicalize_syscall (scnum); |
| 811 | |
| 812 | if (syscall_gdb < 0) |
| 813 | { |
| 814 | printf_unfiltered (_("Process record and replay target doesn't " |
| 815 | "support syscall number %d\n"), (int) scnum); |
| 816 | return 0; |
| 817 | } |
| 818 | |
| 819 | if (syscall_gdb == gdb_sys_sigreturn |
| 820 | || syscall_gdb == gdb_sys_rt_sigreturn) |
| 821 | { |
| 822 | int i, j; |
| 823 | int regsets[] = { tdep->ppc_gp0_regnum, |
| 824 | tdep->ppc_fp0_regnum, |
| 825 | tdep->ppc_vr0_regnum, |
| 826 | tdep->ppc_vsr0_upper_regnum }; |
| 827 | |
| 828 | for (j = 0; j < 4; j++) |
| 829 | { |
| 830 | if (regsets[j] == -1) |
| 831 | continue; |
| 832 | for (i = 0; i < 32; i++) |
| 833 | { |
| 834 | if (record_full_arch_list_add_reg (regcache, regsets[j] + i)) |
| 835 | return -1; |
| 836 | } |
| 837 | } |
| 838 | |
| 839 | if (record_full_arch_list_add_reg (regcache, tdep->ppc_cr_regnum)) |
| 840 | return -1; |
| 841 | if (record_full_arch_list_add_reg (regcache, tdep->ppc_ctr_regnum)) |
| 842 | return -1; |
| 843 | if (record_full_arch_list_add_reg (regcache, tdep->ppc_lr_regnum)) |
| 844 | return -1; |
| 845 | if (record_full_arch_list_add_reg (regcache, tdep->ppc_xer_regnum)) |
| 846 | return -1; |
| 847 | |
| 848 | return 0; |
| 849 | } |
| 850 | |
| 851 | if (tdep->wordsize == 8) |
| 852 | ret = record_linux_system_call (syscall_gdb, regcache, |
| 853 | &ppc64_linux_record_tdep); |
| 854 | else |
| 855 | ret = record_linux_system_call (syscall_gdb, regcache, |
| 856 | &ppc_linux_record_tdep); |
| 857 | |
| 858 | if (ret != 0) |
| 859 | return ret; |
| 860 | |
| 861 | /* Record registers clobbered during syscall. */ |
| 862 | for (i = 3; i <= 12; i++) |
| 863 | { |
| 864 | if (record_full_arch_list_add_reg (regcache, tdep->ppc_gp0_regnum + i)) |
| 865 | return -1; |
| 866 | } |
| 867 | if (record_full_arch_list_add_reg (regcache, tdep->ppc_gp0_regnum + 0)) |
| 868 | return -1; |
| 869 | if (record_full_arch_list_add_reg (regcache, tdep->ppc_cr_regnum)) |
| 870 | return -1; |
| 871 | if (record_full_arch_list_add_reg (regcache, tdep->ppc_ctr_regnum)) |
| 872 | return -1; |
| 873 | if (record_full_arch_list_add_reg (regcache, tdep->ppc_lr_regnum)) |
| 874 | return -1; |
| 875 | |
| 876 | return 0; |
| 877 | } |
| 878 | |
| 879 | /* Record registers which might be clobbered during signal handling. |
| 880 | Return 0 if successful. */ |
| 881 | |
| 882 | static int |
| 883 | ppc_linux_record_signal (struct gdbarch *gdbarch, struct regcache *regcache, |
| 884 | enum gdb_signal signal) |
| 885 | { |
| 886 | /* See handle_rt_signal64 in arch/powerpc/kernel/signal_64.c |
| 887 | handle_rt_signal32 in arch/powerpc/kernel/signal_32.c |
| 888 | arch/powerpc/include/asm/ptrace.h |
| 889 | for details. */ |
| 890 | const int SIGNAL_FRAMESIZE = 128; |
| 891 | const int sizeof_rt_sigframe = 1440 * 2 + 8 * 2 + 4 * 6 + 8 + 8 + 128 + 512; |
| 892 | ULONGEST sp; |
| 893 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 894 | int i; |
| 895 | |
| 896 | for (i = 3; i <= 12; i++) |
| 897 | { |
| 898 | if (record_full_arch_list_add_reg (regcache, tdep->ppc_gp0_regnum + i)) |
| 899 | return -1; |
| 900 | } |
| 901 | |
| 902 | if (record_full_arch_list_add_reg (regcache, tdep->ppc_lr_regnum)) |
| 903 | return -1; |
| 904 | if (record_full_arch_list_add_reg (regcache, tdep->ppc_cr_regnum)) |
| 905 | return -1; |
| 906 | if (record_full_arch_list_add_reg (regcache, tdep->ppc_ctr_regnum)) |
| 907 | return -1; |
| 908 | if (record_full_arch_list_add_reg (regcache, gdbarch_pc_regnum (gdbarch))) |
| 909 | return -1; |
| 910 | if (record_full_arch_list_add_reg (regcache, gdbarch_sp_regnum (gdbarch))) |
| 911 | return -1; |
| 912 | |
| 913 | /* Record the change in the stack. |
| 914 | frame-size = sizeof (struct rt_sigframe) + SIGNAL_FRAMESIZE */ |
| 915 | regcache_raw_read_unsigned (regcache, gdbarch_sp_regnum (gdbarch), &sp); |
| 916 | sp -= SIGNAL_FRAMESIZE; |
| 917 | sp -= sizeof_rt_sigframe; |
| 918 | |
| 919 | if (record_full_arch_list_add_mem (sp, SIGNAL_FRAMESIZE + sizeof_rt_sigframe)) |
| 920 | return -1; |
| 921 | |
| 922 | if (record_full_arch_list_add_end ()) |
| 923 | return -1; |
| 924 | |
| 925 | return 0; |
| 926 | } |
| 927 | |
| 928 | static void |
| 929 | ppc_linux_write_pc (struct regcache *regcache, CORE_ADDR pc) |
| 930 | { |
| 931 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 932 | |
| 933 | regcache_cooked_write_unsigned (regcache, gdbarch_pc_regnum (gdbarch), pc); |
| 934 | |
| 935 | /* Set special TRAP register to -1 to prevent the kernel from |
| 936 | messing with the PC we just installed, if we happen to be |
| 937 | within an interrupted system call that the kernel wants to |
| 938 | restart. |
| 939 | |
| 940 | Note that after we return from the dummy call, the TRAP and |
| 941 | ORIG_R3 registers will be automatically restored, and the |
| 942 | kernel continues to restart the system call at this point. */ |
| 943 | if (ppc_linux_trap_reg_p (gdbarch)) |
| 944 | regcache_cooked_write_unsigned (regcache, PPC_TRAP_REGNUM, -1); |
| 945 | } |
| 946 | |
| 947 | static int |
| 948 | ppc_linux_spu_section (bfd *abfd, asection *asect, void *user_data) |
| 949 | { |
| 950 | return startswith (bfd_section_name (abfd, asect), "SPU/"); |
| 951 | } |
| 952 | |
| 953 | static const struct target_desc * |
| 954 | ppc_linux_core_read_description (struct gdbarch *gdbarch, |
| 955 | struct target_ops *target, |
| 956 | bfd *abfd) |
| 957 | { |
| 958 | asection *cell = bfd_sections_find_if (abfd, ppc_linux_spu_section, NULL); |
| 959 | asection *altivec = bfd_get_section_by_name (abfd, ".reg-ppc-vmx"); |
| 960 | asection *vsx = bfd_get_section_by_name (abfd, ".reg-ppc-vsx"); |
| 961 | asection *section = bfd_get_section_by_name (abfd, ".reg"); |
| 962 | if (! section) |
| 963 | return NULL; |
| 964 | |
| 965 | switch (bfd_section_size (abfd, section)) |
| 966 | { |
| 967 | case 48 * 4: |
| 968 | if (cell) |
| 969 | return tdesc_powerpc_cell32l; |
| 970 | else if (vsx) |
| 971 | return tdesc_powerpc_vsx32l; |
| 972 | else if (altivec) |
| 973 | return tdesc_powerpc_altivec32l; |
| 974 | else |
| 975 | return tdesc_powerpc_32l; |
| 976 | |
| 977 | case 48 * 8: |
| 978 | if (cell) |
| 979 | return tdesc_powerpc_cell64l; |
| 980 | else if (vsx) |
| 981 | return tdesc_powerpc_vsx64l; |
| 982 | else if (altivec) |
| 983 | return tdesc_powerpc_altivec64l; |
| 984 | else |
| 985 | return tdesc_powerpc_64l; |
| 986 | |
| 987 | default: |
| 988 | return NULL; |
| 989 | } |
| 990 | } |
| 991 | |
| 992 | |
| 993 | /* Implementation of `gdbarch_elf_make_msymbol_special', as defined in |
| 994 | gdbarch.h. This implementation is used for the ELFv2 ABI only. */ |
| 995 | |
| 996 | static void |
| 997 | ppc_elfv2_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym) |
| 998 | { |
| 999 | elf_symbol_type *elf_sym = (elf_symbol_type *)sym; |
| 1000 | |
| 1001 | /* If the symbol is marked as having a local entry point, set a target |
| 1002 | flag in the msymbol. We currently only support local entry point |
| 1003 | offsets of 8 bytes, which is the only entry point offset ever used |
| 1004 | by current compilers. If/when other offsets are ever used, we will |
| 1005 | have to use additional target flag bits to store them. */ |
| 1006 | switch (PPC64_LOCAL_ENTRY_OFFSET (elf_sym->internal_elf_sym.st_other)) |
| 1007 | { |
| 1008 | default: |
| 1009 | break; |
| 1010 | case 8: |
| 1011 | MSYMBOL_TARGET_FLAG_1 (msym) = 1; |
| 1012 | break; |
| 1013 | } |
| 1014 | } |
| 1015 | |
| 1016 | /* Implementation of `gdbarch_skip_entrypoint', as defined in |
| 1017 | gdbarch.h. This implementation is used for the ELFv2 ABI only. */ |
| 1018 | |
| 1019 | static CORE_ADDR |
| 1020 | ppc_elfv2_skip_entrypoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 1021 | { |
| 1022 | struct bound_minimal_symbol fun; |
| 1023 | int local_entry_offset = 0; |
| 1024 | |
| 1025 | fun = lookup_minimal_symbol_by_pc (pc); |
| 1026 | if (fun.minsym == NULL) |
| 1027 | return pc; |
| 1028 | |
| 1029 | /* See ppc_elfv2_elf_make_msymbol_special for how local entry point |
| 1030 | offset values are encoded. */ |
| 1031 | if (MSYMBOL_TARGET_FLAG_1 (fun.minsym)) |
| 1032 | local_entry_offset = 8; |
| 1033 | |
| 1034 | if (BMSYMBOL_VALUE_ADDRESS (fun) <= pc |
| 1035 | && pc < BMSYMBOL_VALUE_ADDRESS (fun) + local_entry_offset) |
| 1036 | return BMSYMBOL_VALUE_ADDRESS (fun) + local_entry_offset; |
| 1037 | |
| 1038 | return pc; |
| 1039 | } |
| 1040 | |
| 1041 | /* Implementation of `gdbarch_stap_is_single_operand', as defined in |
| 1042 | gdbarch.h. */ |
| 1043 | |
| 1044 | static int |
| 1045 | ppc_stap_is_single_operand (struct gdbarch *gdbarch, const char *s) |
| 1046 | { |
| 1047 | return (*s == 'i' /* Literal number. */ |
| 1048 | || (isdigit (*s) && s[1] == '(' |
| 1049 | && isdigit (s[2])) /* Displacement. */ |
| 1050 | || (*s == '(' && isdigit (s[1])) /* Register indirection. */ |
| 1051 | || isdigit (*s)); /* Register value. */ |
| 1052 | } |
| 1053 | |
| 1054 | /* Implementation of `gdbarch_stap_parse_special_token', as defined in |
| 1055 | gdbarch.h. */ |
| 1056 | |
| 1057 | static int |
| 1058 | ppc_stap_parse_special_token (struct gdbarch *gdbarch, |
| 1059 | struct stap_parse_info *p) |
| 1060 | { |
| 1061 | if (isdigit (*p->arg)) |
| 1062 | { |
| 1063 | /* This temporary pointer is needed because we have to do a lookahead. |
| 1064 | We could be dealing with a register displacement, and in such case |
| 1065 | we would not need to do anything. */ |
| 1066 | const char *s = p->arg; |
| 1067 | char *regname; |
| 1068 | int len; |
| 1069 | struct stoken str; |
| 1070 | |
| 1071 | while (isdigit (*s)) |
| 1072 | ++s; |
| 1073 | |
| 1074 | if (*s == '(') |
| 1075 | { |
| 1076 | /* It is a register displacement indeed. Returning 0 means we are |
| 1077 | deferring the treatment of this case to the generic parser. */ |
| 1078 | return 0; |
| 1079 | } |
| 1080 | |
| 1081 | len = s - p->arg; |
| 1082 | regname = alloca (len + 2); |
| 1083 | regname[0] = 'r'; |
| 1084 | |
| 1085 | strncpy (regname + 1, p->arg, len); |
| 1086 | ++len; |
| 1087 | regname[len] = '\0'; |
| 1088 | |
| 1089 | if (user_reg_map_name_to_regnum (gdbarch, regname, len) == -1) |
| 1090 | error (_("Invalid register name `%s' on expression `%s'."), |
| 1091 | regname, p->saved_arg); |
| 1092 | |
| 1093 | write_exp_elt_opcode (&p->pstate, OP_REGISTER); |
| 1094 | str.ptr = regname; |
| 1095 | str.length = len; |
| 1096 | write_exp_string (&p->pstate, str); |
| 1097 | write_exp_elt_opcode (&p->pstate, OP_REGISTER); |
| 1098 | |
| 1099 | p->arg = s; |
| 1100 | } |
| 1101 | else |
| 1102 | { |
| 1103 | /* All the other tokens should be handled correctly by the generic |
| 1104 | parser. */ |
| 1105 | return 0; |
| 1106 | } |
| 1107 | |
| 1108 | return 1; |
| 1109 | } |
| 1110 | |
| 1111 | /* Cell/B.E. active SPE context tracking support. */ |
| 1112 | |
| 1113 | static struct objfile *spe_context_objfile = NULL; |
| 1114 | static CORE_ADDR spe_context_lm_addr = 0; |
| 1115 | static CORE_ADDR spe_context_offset = 0; |
| 1116 | |
| 1117 | static ptid_t spe_context_cache_ptid; |
| 1118 | static CORE_ADDR spe_context_cache_address; |
| 1119 | |
| 1120 | /* Hook into inferior_created, solib_loaded, and solib_unloaded observers |
| 1121 | to track whether we've loaded a version of libspe2 (as static or dynamic |
| 1122 | library) that provides the __spe_current_active_context variable. */ |
| 1123 | static void |
| 1124 | ppc_linux_spe_context_lookup (struct objfile *objfile) |
| 1125 | { |
| 1126 | struct bound_minimal_symbol sym; |
| 1127 | |
| 1128 | if (!objfile) |
| 1129 | { |
| 1130 | spe_context_objfile = NULL; |
| 1131 | spe_context_lm_addr = 0; |
| 1132 | spe_context_offset = 0; |
| 1133 | spe_context_cache_ptid = minus_one_ptid; |
| 1134 | spe_context_cache_address = 0; |
| 1135 | return; |
| 1136 | } |
| 1137 | |
| 1138 | sym = lookup_minimal_symbol ("__spe_current_active_context", NULL, objfile); |
| 1139 | if (sym.minsym) |
| 1140 | { |
| 1141 | spe_context_objfile = objfile; |
| 1142 | spe_context_lm_addr = svr4_fetch_objfile_link_map (objfile); |
| 1143 | spe_context_offset = MSYMBOL_VALUE_RAW_ADDRESS (sym.minsym); |
| 1144 | spe_context_cache_ptid = minus_one_ptid; |
| 1145 | spe_context_cache_address = 0; |
| 1146 | return; |
| 1147 | } |
| 1148 | } |
| 1149 | |
| 1150 | static void |
| 1151 | ppc_linux_spe_context_inferior_created (struct target_ops *t, int from_tty) |
| 1152 | { |
| 1153 | struct objfile *objfile; |
| 1154 | |
| 1155 | ppc_linux_spe_context_lookup (NULL); |
| 1156 | ALL_OBJFILES (objfile) |
| 1157 | ppc_linux_spe_context_lookup (objfile); |
| 1158 | } |
| 1159 | |
| 1160 | static void |
| 1161 | ppc_linux_spe_context_solib_loaded (struct so_list *so) |
| 1162 | { |
| 1163 | if (strstr (so->so_original_name, "/libspe") != NULL) |
| 1164 | { |
| 1165 | solib_read_symbols (so, 0); |
| 1166 | ppc_linux_spe_context_lookup (so->objfile); |
| 1167 | } |
| 1168 | } |
| 1169 | |
| 1170 | static void |
| 1171 | ppc_linux_spe_context_solib_unloaded (struct so_list *so) |
| 1172 | { |
| 1173 | if (so->objfile == spe_context_objfile) |
| 1174 | ppc_linux_spe_context_lookup (NULL); |
| 1175 | } |
| 1176 | |
| 1177 | /* Retrieve contents of the N'th element in the current thread's |
| 1178 | linked SPE context list into ID and NPC. Return the address of |
| 1179 | said context element, or 0 if not found. */ |
| 1180 | static CORE_ADDR |
| 1181 | ppc_linux_spe_context (int wordsize, enum bfd_endian byte_order, |
| 1182 | int n, int *id, unsigned int *npc) |
| 1183 | { |
| 1184 | CORE_ADDR spe_context = 0; |
| 1185 | gdb_byte buf[16]; |
| 1186 | int i; |
| 1187 | |
| 1188 | /* Quick exit if we have not found __spe_current_active_context. */ |
| 1189 | if (!spe_context_objfile) |
| 1190 | return 0; |
| 1191 | |
| 1192 | /* Look up cached address of thread-local variable. */ |
| 1193 | if (!ptid_equal (spe_context_cache_ptid, inferior_ptid)) |
| 1194 | { |
| 1195 | struct target_ops *target = ¤t_target; |
| 1196 | |
| 1197 | TRY |
| 1198 | { |
| 1199 | /* We do not call target_translate_tls_address here, because |
| 1200 | svr4_fetch_objfile_link_map may invalidate the frame chain, |
| 1201 | which must not do while inside a frame sniffer. |
| 1202 | |
| 1203 | Instead, we have cached the lm_addr value, and use that to |
| 1204 | directly call the target's to_get_thread_local_address. */ |
| 1205 | spe_context_cache_address |
| 1206 | = target->to_get_thread_local_address (target, inferior_ptid, |
| 1207 | spe_context_lm_addr, |
| 1208 | spe_context_offset); |
| 1209 | spe_context_cache_ptid = inferior_ptid; |
| 1210 | } |
| 1211 | |
| 1212 | CATCH (ex, RETURN_MASK_ERROR) |
| 1213 | { |
| 1214 | return 0; |
| 1215 | } |
| 1216 | END_CATCH |
| 1217 | } |
| 1218 | |
| 1219 | /* Read variable value. */ |
| 1220 | if (target_read_memory (spe_context_cache_address, buf, wordsize) == 0) |
| 1221 | spe_context = extract_unsigned_integer (buf, wordsize, byte_order); |
| 1222 | |
| 1223 | /* Cyle through to N'th linked list element. */ |
| 1224 | for (i = 0; i < n && spe_context; i++) |
| 1225 | if (target_read_memory (spe_context + align_up (12, wordsize), |
| 1226 | buf, wordsize) == 0) |
| 1227 | spe_context = extract_unsigned_integer (buf, wordsize, byte_order); |
| 1228 | else |
| 1229 | spe_context = 0; |
| 1230 | |
| 1231 | /* Read current context. */ |
| 1232 | if (spe_context |
| 1233 | && target_read_memory (spe_context, buf, 12) != 0) |
| 1234 | spe_context = 0; |
| 1235 | |
| 1236 | /* Extract data elements. */ |
| 1237 | if (spe_context) |
| 1238 | { |
| 1239 | if (id) |
| 1240 | *id = extract_signed_integer (buf, 4, byte_order); |
| 1241 | if (npc) |
| 1242 | *npc = extract_unsigned_integer (buf + 4, 4, byte_order); |
| 1243 | } |
| 1244 | |
| 1245 | return spe_context; |
| 1246 | } |
| 1247 | |
| 1248 | |
| 1249 | /* Cell/B.E. cross-architecture unwinder support. */ |
| 1250 | |
| 1251 | struct ppu2spu_cache |
| 1252 | { |
| 1253 | struct frame_id frame_id; |
| 1254 | struct regcache *regcache; |
| 1255 | }; |
| 1256 | |
| 1257 | static struct gdbarch * |
| 1258 | ppu2spu_prev_arch (struct frame_info *this_frame, void **this_cache) |
| 1259 | { |
| 1260 | struct ppu2spu_cache *cache = *this_cache; |
| 1261 | return get_regcache_arch (cache->regcache); |
| 1262 | } |
| 1263 | |
| 1264 | static void |
| 1265 | ppu2spu_this_id (struct frame_info *this_frame, |
| 1266 | void **this_cache, struct frame_id *this_id) |
| 1267 | { |
| 1268 | struct ppu2spu_cache *cache = *this_cache; |
| 1269 | *this_id = cache->frame_id; |
| 1270 | } |
| 1271 | |
| 1272 | static struct value * |
| 1273 | ppu2spu_prev_register (struct frame_info *this_frame, |
| 1274 | void **this_cache, int regnum) |
| 1275 | { |
| 1276 | struct ppu2spu_cache *cache = *this_cache; |
| 1277 | struct gdbarch *gdbarch = get_regcache_arch (cache->regcache); |
| 1278 | gdb_byte *buf; |
| 1279 | |
| 1280 | buf = alloca (register_size (gdbarch, regnum)); |
| 1281 | |
| 1282 | if (regnum < gdbarch_num_regs (gdbarch)) |
| 1283 | regcache_raw_read (cache->regcache, regnum, buf); |
| 1284 | else |
| 1285 | gdbarch_pseudo_register_read (gdbarch, cache->regcache, regnum, buf); |
| 1286 | |
| 1287 | return frame_unwind_got_bytes (this_frame, regnum, buf); |
| 1288 | } |
| 1289 | |
| 1290 | struct ppu2spu_data |
| 1291 | { |
| 1292 | struct gdbarch *gdbarch; |
| 1293 | int id; |
| 1294 | unsigned int npc; |
| 1295 | gdb_byte gprs[128*16]; |
| 1296 | }; |
| 1297 | |
| 1298 | static enum register_status |
| 1299 | ppu2spu_unwind_register (void *src, int regnum, gdb_byte *buf) |
| 1300 | { |
| 1301 | struct ppu2spu_data *data = src; |
| 1302 | enum bfd_endian byte_order = gdbarch_byte_order (data->gdbarch); |
| 1303 | |
| 1304 | if (regnum >= 0 && regnum < SPU_NUM_GPRS) |
| 1305 | memcpy (buf, data->gprs + 16*regnum, 16); |
| 1306 | else if (regnum == SPU_ID_REGNUM) |
| 1307 | store_unsigned_integer (buf, 4, byte_order, data->id); |
| 1308 | else if (regnum == SPU_PC_REGNUM) |
| 1309 | store_unsigned_integer (buf, 4, byte_order, data->npc); |
| 1310 | else |
| 1311 | return REG_UNAVAILABLE; |
| 1312 | |
| 1313 | return REG_VALID; |
| 1314 | } |
| 1315 | |
| 1316 | static int |
| 1317 | ppu2spu_sniffer (const struct frame_unwind *self, |
| 1318 | struct frame_info *this_frame, void **this_prologue_cache) |
| 1319 | { |
| 1320 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 1321 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1322 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 1323 | struct ppu2spu_data data; |
| 1324 | struct frame_info *fi; |
| 1325 | CORE_ADDR base, func, backchain, spe_context; |
| 1326 | gdb_byte buf[8]; |
| 1327 | int n = 0; |
| 1328 | |
| 1329 | /* Count the number of SPU contexts already in the frame chain. */ |
| 1330 | for (fi = get_next_frame (this_frame); fi; fi = get_next_frame (fi)) |
| 1331 | if (get_frame_type (fi) == ARCH_FRAME |
| 1332 | && gdbarch_bfd_arch_info (get_frame_arch (fi))->arch == bfd_arch_spu) |
| 1333 | n++; |
| 1334 | |
| 1335 | base = get_frame_sp (this_frame); |
| 1336 | func = get_frame_pc (this_frame); |
| 1337 | if (target_read_memory (base, buf, tdep->wordsize)) |
| 1338 | return 0; |
| 1339 | backchain = extract_unsigned_integer (buf, tdep->wordsize, byte_order); |
| 1340 | |
| 1341 | spe_context = ppc_linux_spe_context (tdep->wordsize, byte_order, |
| 1342 | n, &data.id, &data.npc); |
| 1343 | if (spe_context && base <= spe_context && spe_context < backchain) |
| 1344 | { |
| 1345 | char annex[32]; |
| 1346 | |
| 1347 | /* Find gdbarch for SPU. */ |
| 1348 | struct gdbarch_info info; |
| 1349 | gdbarch_info_init (&info); |
| 1350 | info.bfd_arch_info = bfd_lookup_arch (bfd_arch_spu, bfd_mach_spu); |
| 1351 | info.byte_order = BFD_ENDIAN_BIG; |
| 1352 | info.osabi = GDB_OSABI_LINUX; |
| 1353 | info.tdep_info = (void *) &data.id; |
| 1354 | data.gdbarch = gdbarch_find_by_info (info); |
| 1355 | if (!data.gdbarch) |
| 1356 | return 0; |
| 1357 | |
| 1358 | xsnprintf (annex, sizeof annex, "%d/regs", data.id); |
| 1359 | if (target_read (¤t_target, TARGET_OBJECT_SPU, annex, |
| 1360 | data.gprs, 0, sizeof data.gprs) |
| 1361 | == sizeof data.gprs) |
| 1362 | { |
| 1363 | struct ppu2spu_cache *cache |
| 1364 | = FRAME_OBSTACK_CALLOC (1, struct ppu2spu_cache); |
| 1365 | |
| 1366 | struct address_space *aspace = get_frame_address_space (this_frame); |
| 1367 | struct regcache *regcache = regcache_xmalloc (data.gdbarch, aspace); |
| 1368 | struct cleanup *cleanups = make_cleanup_regcache_xfree (regcache); |
| 1369 | regcache_save (regcache, ppu2spu_unwind_register, &data); |
| 1370 | discard_cleanups (cleanups); |
| 1371 | |
| 1372 | cache->frame_id = frame_id_build (base, func); |
| 1373 | cache->regcache = regcache; |
| 1374 | *this_prologue_cache = cache; |
| 1375 | return 1; |
| 1376 | } |
| 1377 | } |
| 1378 | |
| 1379 | return 0; |
| 1380 | } |
| 1381 | |
| 1382 | static void |
| 1383 | ppu2spu_dealloc_cache (struct frame_info *self, void *this_cache) |
| 1384 | { |
| 1385 | struct ppu2spu_cache *cache = this_cache; |
| 1386 | regcache_xfree (cache->regcache); |
| 1387 | } |
| 1388 | |
| 1389 | static const struct frame_unwind ppu2spu_unwind = { |
| 1390 | ARCH_FRAME, |
| 1391 | default_frame_unwind_stop_reason, |
| 1392 | ppu2spu_this_id, |
| 1393 | ppu2spu_prev_register, |
| 1394 | NULL, |
| 1395 | ppu2spu_sniffer, |
| 1396 | ppu2spu_dealloc_cache, |
| 1397 | ppu2spu_prev_arch, |
| 1398 | }; |
| 1399 | |
| 1400 | /* Initialize linux_record_tdep if not initialized yet. |
| 1401 | WORDSIZE is 4 or 8 for 32- or 64-bit PowerPC Linux respectively. |
| 1402 | Sizes of data structures are initialized accordingly. */ |
| 1403 | |
| 1404 | static void |
| 1405 | ppc_init_linux_record_tdep (struct linux_record_tdep *record_tdep, |
| 1406 | int wordsize) |
| 1407 | { |
| 1408 | /* Simply return if it had been initialized. */ |
| 1409 | if (record_tdep->size_pointer != 0) |
| 1410 | return; |
| 1411 | |
| 1412 | /* These values are the size of the type that will be used in a system |
| 1413 | call. They are obtained from Linux Kernel source. */ |
| 1414 | |
| 1415 | if (wordsize == 8) |
| 1416 | { |
| 1417 | record_tdep->size_pointer = 8; |
| 1418 | record_tdep->size__old_kernel_stat = 32; |
| 1419 | record_tdep->size_tms = 32; |
| 1420 | record_tdep->size_loff_t = 8; |
| 1421 | record_tdep->size_flock = 32; |
| 1422 | record_tdep->size_oldold_utsname = 45; |
| 1423 | record_tdep->size_ustat = 32; |
| 1424 | record_tdep->size_old_sigaction = 152; |
| 1425 | record_tdep->size_old_sigset_t = 128; |
| 1426 | record_tdep->size_rlimit = 16; |
| 1427 | record_tdep->size_rusage = 144; |
| 1428 | record_tdep->size_timeval = 16; |
| 1429 | record_tdep->size_timezone = 8; |
| 1430 | record_tdep->size_old_gid_t = 4; |
| 1431 | record_tdep->size_old_uid_t = 4; |
| 1432 | record_tdep->size_fd_set = 128; |
| 1433 | record_tdep->size_dirent = 280; |
| 1434 | record_tdep->size_dirent64 = 280; |
| 1435 | record_tdep->size_statfs = 120; |
| 1436 | record_tdep->size_statfs64 = 120; |
| 1437 | record_tdep->size_sockaddr = 16; |
| 1438 | record_tdep->size_int = 4; |
| 1439 | record_tdep->size_long = 8; |
| 1440 | record_tdep->size_ulong = 8; |
| 1441 | record_tdep->size_msghdr = 56; |
| 1442 | record_tdep->size_itimerval = 32; |
| 1443 | record_tdep->size_stat = 144; |
| 1444 | record_tdep->size_old_utsname = 325; |
| 1445 | record_tdep->size_sysinfo = 112; |
| 1446 | record_tdep->size_msqid_ds = 120; |
| 1447 | record_tdep->size_shmid_ds = 112; |
| 1448 | record_tdep->size_new_utsname = 390; |
| 1449 | record_tdep->size_timex = 208; |
| 1450 | record_tdep->size_mem_dqinfo = 24; |
| 1451 | record_tdep->size_if_dqblk = 72; |
| 1452 | record_tdep->size_fs_quota_stat = 80; |
| 1453 | record_tdep->size_timespec = 16; |
| 1454 | record_tdep->size_pollfd = 8; |
| 1455 | record_tdep->size_NFS_FHSIZE = 32; |
| 1456 | record_tdep->size_knfsd_fh = 132; |
| 1457 | record_tdep->size_TASK_COMM_LEN = 32; |
| 1458 | record_tdep->size_sigaction = 152; |
| 1459 | record_tdep->size_sigset_t = 128; |
| 1460 | record_tdep->size_siginfo_t = 128; |
| 1461 | record_tdep->size_cap_user_data_t = 8; |
| 1462 | record_tdep->size_stack_t = 24; |
| 1463 | record_tdep->size_off_t = 8; |
| 1464 | record_tdep->size_stat64 = 104; |
| 1465 | record_tdep->size_gid_t = 4; |
| 1466 | record_tdep->size_uid_t = 4; |
| 1467 | record_tdep->size_PAGE_SIZE = 0x10000; /* 64KB */ |
| 1468 | record_tdep->size_flock64 = 32; |
| 1469 | record_tdep->size_io_event = 32; |
| 1470 | record_tdep->size_iocb = 64; |
| 1471 | record_tdep->size_epoll_event = 16; |
| 1472 | record_tdep->size_itimerspec = 32; |
| 1473 | record_tdep->size_mq_attr = 64; |
| 1474 | record_tdep->size_siginfo = 128; |
| 1475 | record_tdep->size_termios = 44; |
| 1476 | record_tdep->size_pid_t = 4; |
| 1477 | record_tdep->size_winsize = 8; |
| 1478 | record_tdep->size_serial_struct = 72; |
| 1479 | record_tdep->size_serial_icounter_struct = 80; |
| 1480 | record_tdep->size_size_t = 8; |
| 1481 | record_tdep->size_iovec = 16; |
| 1482 | } |
| 1483 | else if (wordsize == 4) |
| 1484 | { |
| 1485 | record_tdep->size_pointer = 4; |
| 1486 | record_tdep->size__old_kernel_stat = 32; |
| 1487 | record_tdep->size_tms = 16; |
| 1488 | record_tdep->size_loff_t = 8; |
| 1489 | record_tdep->size_flock = 16; |
| 1490 | record_tdep->size_oldold_utsname = 45; |
| 1491 | record_tdep->size_ustat = 20; |
| 1492 | record_tdep->size_old_sigaction = 152; |
| 1493 | record_tdep->size_old_sigset_t = 128; |
| 1494 | record_tdep->size_rlimit = 8; |
| 1495 | record_tdep->size_rusage = 72; |
| 1496 | record_tdep->size_timeval = 8; |
| 1497 | record_tdep->size_timezone = 8; |
| 1498 | record_tdep->size_old_gid_t = 4; |
| 1499 | record_tdep->size_old_uid_t = 4; |
| 1500 | record_tdep->size_fd_set = 128; |
| 1501 | record_tdep->size_dirent = 268; |
| 1502 | record_tdep->size_dirent64 = 280; |
| 1503 | record_tdep->size_statfs = 64; |
| 1504 | record_tdep->size_statfs64 = 88; |
| 1505 | record_tdep->size_sockaddr = 16; |
| 1506 | record_tdep->size_int = 4; |
| 1507 | record_tdep->size_long = 4; |
| 1508 | record_tdep->size_ulong = 4; |
| 1509 | record_tdep->size_msghdr = 28; |
| 1510 | record_tdep->size_itimerval = 16; |
| 1511 | record_tdep->size_stat = 88; |
| 1512 | record_tdep->size_old_utsname = 325; |
| 1513 | record_tdep->size_sysinfo = 64; |
| 1514 | record_tdep->size_msqid_ds = 68; |
| 1515 | record_tdep->size_shmid_ds = 60; |
| 1516 | record_tdep->size_new_utsname = 390; |
| 1517 | record_tdep->size_timex = 128; |
| 1518 | record_tdep->size_mem_dqinfo = 24; |
| 1519 | record_tdep->size_if_dqblk = 72; |
| 1520 | record_tdep->size_fs_quota_stat = 80; |
| 1521 | record_tdep->size_timespec = 8; |
| 1522 | record_tdep->size_pollfd = 8; |
| 1523 | record_tdep->size_NFS_FHSIZE = 32; |
| 1524 | record_tdep->size_knfsd_fh = 132; |
| 1525 | record_tdep->size_TASK_COMM_LEN = 32; |
| 1526 | record_tdep->size_sigaction = 140; |
| 1527 | record_tdep->size_sigset_t = 128; |
| 1528 | record_tdep->size_siginfo_t = 128; |
| 1529 | record_tdep->size_cap_user_data_t = 4; |
| 1530 | record_tdep->size_stack_t = 12; |
| 1531 | record_tdep->size_off_t = 4; |
| 1532 | record_tdep->size_stat64 = 104; |
| 1533 | record_tdep->size_gid_t = 4; |
| 1534 | record_tdep->size_uid_t = 4; |
| 1535 | record_tdep->size_PAGE_SIZE = 0x10000; /* 64KB */ |
| 1536 | record_tdep->size_flock64 = 32; |
| 1537 | record_tdep->size_io_event = 32; |
| 1538 | record_tdep->size_iocb = 64; |
| 1539 | record_tdep->size_epoll_event = 16; |
| 1540 | record_tdep->size_itimerspec = 16; |
| 1541 | record_tdep->size_mq_attr = 32; |
| 1542 | record_tdep->size_siginfo = 128; |
| 1543 | record_tdep->size_termios = 44; |
| 1544 | record_tdep->size_pid_t = 4; |
| 1545 | record_tdep->size_winsize = 8; |
| 1546 | record_tdep->size_serial_struct = 60; |
| 1547 | record_tdep->size_serial_icounter_struct = 80; |
| 1548 | record_tdep->size_size_t = 4; |
| 1549 | record_tdep->size_iovec = 8; |
| 1550 | } |
| 1551 | else |
| 1552 | internal_error (__FILE__, __LINE__, _("unexpected wordsize")); |
| 1553 | |
| 1554 | /* These values are the second argument of system call "sys_fcntl" |
| 1555 | and "sys_fcntl64". They are obtained from Linux Kernel source. */ |
| 1556 | record_tdep->fcntl_F_GETLK = 5; |
| 1557 | record_tdep->fcntl_F_GETLK64 = 12; |
| 1558 | record_tdep->fcntl_F_SETLK64 = 13; |
| 1559 | record_tdep->fcntl_F_SETLKW64 = 14; |
| 1560 | |
| 1561 | record_tdep->arg1 = PPC_R0_REGNUM + 3; |
| 1562 | record_tdep->arg2 = PPC_R0_REGNUM + 4; |
| 1563 | record_tdep->arg3 = PPC_R0_REGNUM + 5; |
| 1564 | record_tdep->arg4 = PPC_R0_REGNUM + 6; |
| 1565 | record_tdep->arg5 = PPC_R0_REGNUM + 7; |
| 1566 | record_tdep->arg6 = PPC_R0_REGNUM + 8; |
| 1567 | |
| 1568 | /* These values are the second argument of system call "sys_ioctl". |
| 1569 | They are obtained from Linux Kernel source. |
| 1570 | See arch/powerpc/include/uapi/asm/ioctls.h. */ |
| 1571 | record_tdep->ioctl_TCGETS = 0x403c7413; |
| 1572 | record_tdep->ioctl_TCSETS = 0x803c7414; |
| 1573 | record_tdep->ioctl_TCSETSW = 0x803c7415; |
| 1574 | record_tdep->ioctl_TCSETSF = 0x803c7416; |
| 1575 | record_tdep->ioctl_TCGETA = 0x40147417; |
| 1576 | record_tdep->ioctl_TCSETA = 0x80147418; |
| 1577 | record_tdep->ioctl_TCSETAW = 0x80147419; |
| 1578 | record_tdep->ioctl_TCSETAF = 0x8014741c; |
| 1579 | record_tdep->ioctl_TCSBRK = 0x2000741d; |
| 1580 | record_tdep->ioctl_TCXONC = 0x2000741e; |
| 1581 | record_tdep->ioctl_TCFLSH = 0x2000741f; |
| 1582 | record_tdep->ioctl_TIOCEXCL = 0x540c; |
| 1583 | record_tdep->ioctl_TIOCNXCL = 0x540d; |
| 1584 | record_tdep->ioctl_TIOCSCTTY = 0x540e; |
| 1585 | record_tdep->ioctl_TIOCGPGRP = 0x40047477; |
| 1586 | record_tdep->ioctl_TIOCSPGRP = 0x80047476; |
| 1587 | record_tdep->ioctl_TIOCOUTQ = 0x40047473; |
| 1588 | record_tdep->ioctl_TIOCSTI = 0x5412; |
| 1589 | record_tdep->ioctl_TIOCGWINSZ = 0x40087468; |
| 1590 | record_tdep->ioctl_TIOCSWINSZ = 0x80087467; |
| 1591 | record_tdep->ioctl_TIOCMGET = 0x5415; |
| 1592 | record_tdep->ioctl_TIOCMBIS = 0x5416; |
| 1593 | record_tdep->ioctl_TIOCMBIC = 0x5417; |
| 1594 | record_tdep->ioctl_TIOCMSET = 0x5418; |
| 1595 | record_tdep->ioctl_TIOCGSOFTCAR = 0x5419; |
| 1596 | record_tdep->ioctl_TIOCSSOFTCAR = 0x541a; |
| 1597 | record_tdep->ioctl_FIONREAD = 0x4004667f; |
| 1598 | record_tdep->ioctl_TIOCINQ = 0x4004667f; |
| 1599 | record_tdep->ioctl_TIOCLINUX = 0x541c; |
| 1600 | record_tdep->ioctl_TIOCCONS = 0x541d; |
| 1601 | record_tdep->ioctl_TIOCGSERIAL = 0x541e; |
| 1602 | record_tdep->ioctl_TIOCSSERIAL = 0x541f; |
| 1603 | record_tdep->ioctl_TIOCPKT = 0x5420; |
| 1604 | record_tdep->ioctl_FIONBIO = 0x8004667e; |
| 1605 | record_tdep->ioctl_TIOCNOTTY = 0x5422; |
| 1606 | record_tdep->ioctl_TIOCSETD = 0x5423; |
| 1607 | record_tdep->ioctl_TIOCGETD = 0x5424; |
| 1608 | record_tdep->ioctl_TCSBRKP = 0x5425; |
| 1609 | record_tdep->ioctl_TIOCSBRK = 0x5427; |
| 1610 | record_tdep->ioctl_TIOCCBRK = 0x5428; |
| 1611 | record_tdep->ioctl_TIOCGSID = 0x5429; |
| 1612 | record_tdep->ioctl_TIOCGPTN = 0x40045430; |
| 1613 | record_tdep->ioctl_TIOCSPTLCK = 0x80045431; |
| 1614 | record_tdep->ioctl_FIONCLEX = 0x20006602; |
| 1615 | record_tdep->ioctl_FIOCLEX = 0x20006601; |
| 1616 | record_tdep->ioctl_FIOASYNC = 0x8004667d; |
| 1617 | record_tdep->ioctl_TIOCSERCONFIG = 0x5453; |
| 1618 | record_tdep->ioctl_TIOCSERGWILD = 0x5454; |
| 1619 | record_tdep->ioctl_TIOCSERSWILD = 0x5455; |
| 1620 | record_tdep->ioctl_TIOCGLCKTRMIOS = 0x5456; |
| 1621 | record_tdep->ioctl_TIOCSLCKTRMIOS = 0x5457; |
| 1622 | record_tdep->ioctl_TIOCSERGSTRUCT = 0x5458; |
| 1623 | record_tdep->ioctl_TIOCSERGETLSR = 0x5459; |
| 1624 | record_tdep->ioctl_TIOCSERGETMULTI = 0x545a; |
| 1625 | record_tdep->ioctl_TIOCSERSETMULTI = 0x545b; |
| 1626 | record_tdep->ioctl_TIOCMIWAIT = 0x545c; |
| 1627 | record_tdep->ioctl_TIOCGICOUNT = 0x545d; |
| 1628 | record_tdep->ioctl_FIOQSIZE = 0x40086680; |
| 1629 | } |
| 1630 | |
| 1631 | static void |
| 1632 | ppc_linux_init_abi (struct gdbarch_info info, |
| 1633 | struct gdbarch *gdbarch) |
| 1634 | { |
| 1635 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1636 | struct tdesc_arch_data *tdesc_data = (void *) info.tdep_info; |
| 1637 | static const char *const stap_integer_prefixes[] = { "i", NULL }; |
| 1638 | static const char *const stap_register_indirection_prefixes[] = { "(", |
| 1639 | NULL }; |
| 1640 | static const char *const stap_register_indirection_suffixes[] = { ")", |
| 1641 | NULL }; |
| 1642 | |
| 1643 | linux_init_abi (info, gdbarch); |
| 1644 | |
| 1645 | /* PPC GNU/Linux uses either 64-bit or 128-bit long doubles; where |
| 1646 | 128-bit, they are IBM long double, not IEEE quad long double as |
| 1647 | in the System V ABI PowerPC Processor Supplement. We can safely |
| 1648 | let them default to 128-bit, since the debug info will give the |
| 1649 | size of type actually used in each case. */ |
| 1650 | set_gdbarch_long_double_bit (gdbarch, 16 * TARGET_CHAR_BIT); |
| 1651 | set_gdbarch_long_double_format (gdbarch, floatformats_ibm_long_double); |
| 1652 | |
| 1653 | /* Handle inferior calls during interrupted system calls. */ |
| 1654 | set_gdbarch_write_pc (gdbarch, ppc_linux_write_pc); |
| 1655 | |
| 1656 | /* Get the syscall number from the arch's register. */ |
| 1657 | set_gdbarch_get_syscall_number (gdbarch, ppc_linux_get_syscall_number); |
| 1658 | |
| 1659 | /* SystemTap functions. */ |
| 1660 | set_gdbarch_stap_integer_prefixes (gdbarch, stap_integer_prefixes); |
| 1661 | set_gdbarch_stap_register_indirection_prefixes (gdbarch, |
| 1662 | stap_register_indirection_prefixes); |
| 1663 | set_gdbarch_stap_register_indirection_suffixes (gdbarch, |
| 1664 | stap_register_indirection_suffixes); |
| 1665 | set_gdbarch_stap_gdb_register_prefix (gdbarch, "r"); |
| 1666 | set_gdbarch_stap_is_single_operand (gdbarch, ppc_stap_is_single_operand); |
| 1667 | set_gdbarch_stap_parse_special_token (gdbarch, |
| 1668 | ppc_stap_parse_special_token); |
| 1669 | |
| 1670 | if (tdep->wordsize == 4) |
| 1671 | { |
| 1672 | /* Until November 2001, gcc did not comply with the 32 bit SysV |
| 1673 | R4 ABI requirement that structures less than or equal to 8 |
| 1674 | bytes should be returned in registers. Instead GCC was using |
| 1675 | the AIX/PowerOpen ABI - everything returned in memory |
| 1676 | (well ignoring vectors that is). When this was corrected, it |
| 1677 | wasn't fixed for GNU/Linux native platform. Use the |
| 1678 | PowerOpen struct convention. */ |
| 1679 | set_gdbarch_return_value (gdbarch, ppc_linux_return_value); |
| 1680 | |
| 1681 | set_gdbarch_memory_remove_breakpoint (gdbarch, |
| 1682 | ppc_linux_memory_remove_breakpoint); |
| 1683 | |
| 1684 | /* Shared library handling. */ |
| 1685 | set_gdbarch_skip_trampoline_code (gdbarch, ppc_skip_trampoline_code); |
| 1686 | set_solib_svr4_fetch_link_map_offsets |
| 1687 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| 1688 | |
| 1689 | /* Setting the correct XML syscall filename. */ |
| 1690 | set_xml_syscall_file_name (gdbarch, XML_SYSCALL_FILENAME_PPC); |
| 1691 | |
| 1692 | /* Trampolines. */ |
| 1693 | tramp_frame_prepend_unwinder (gdbarch, |
| 1694 | &ppc32_linux_sigaction_tramp_frame); |
| 1695 | tramp_frame_prepend_unwinder (gdbarch, |
| 1696 | &ppc32_linux_sighandler_tramp_frame); |
| 1697 | |
| 1698 | /* BFD target for core files. */ |
| 1699 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_LITTLE) |
| 1700 | set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpcle"); |
| 1701 | else |
| 1702 | set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpc"); |
| 1703 | |
| 1704 | if (powerpc_so_ops.in_dynsym_resolve_code == NULL) |
| 1705 | { |
| 1706 | powerpc_so_ops = svr4_so_ops; |
| 1707 | /* Override dynamic resolve function. */ |
| 1708 | powerpc_so_ops.in_dynsym_resolve_code = |
| 1709 | powerpc_linux_in_dynsym_resolve_code; |
| 1710 | } |
| 1711 | set_solib_ops (gdbarch, &powerpc_so_ops); |
| 1712 | |
| 1713 | set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); |
| 1714 | } |
| 1715 | |
| 1716 | if (tdep->wordsize == 8) |
| 1717 | { |
| 1718 | if (tdep->elf_abi == POWERPC_ELF_V1) |
| 1719 | { |
| 1720 | /* Handle PPC GNU/Linux 64-bit function pointers (which are really |
| 1721 | function descriptors). */ |
| 1722 | set_gdbarch_convert_from_func_ptr_addr |
| 1723 | (gdbarch, ppc64_convert_from_func_ptr_addr); |
| 1724 | |
| 1725 | set_gdbarch_elf_make_msymbol_special |
| 1726 | (gdbarch, ppc64_elf_make_msymbol_special); |
| 1727 | } |
| 1728 | else |
| 1729 | { |
| 1730 | set_gdbarch_elf_make_msymbol_special |
| 1731 | (gdbarch, ppc_elfv2_elf_make_msymbol_special); |
| 1732 | |
| 1733 | set_gdbarch_skip_entrypoint (gdbarch, ppc_elfv2_skip_entrypoint); |
| 1734 | } |
| 1735 | |
| 1736 | /* Shared library handling. */ |
| 1737 | set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code); |
| 1738 | set_solib_svr4_fetch_link_map_offsets |
| 1739 | (gdbarch, svr4_lp64_fetch_link_map_offsets); |
| 1740 | |
| 1741 | /* Setting the correct XML syscall filename. */ |
| 1742 | set_xml_syscall_file_name (gdbarch, XML_SYSCALL_FILENAME_PPC64); |
| 1743 | |
| 1744 | /* Trampolines. */ |
| 1745 | tramp_frame_prepend_unwinder (gdbarch, |
| 1746 | &ppc64_linux_sigaction_tramp_frame); |
| 1747 | tramp_frame_prepend_unwinder (gdbarch, |
| 1748 | &ppc64_linux_sighandler_tramp_frame); |
| 1749 | |
| 1750 | /* BFD target for core files. */ |
| 1751 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_LITTLE) |
| 1752 | set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpcle"); |
| 1753 | else |
| 1754 | set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpc"); |
| 1755 | } |
| 1756 | |
| 1757 | /* PPC32 uses a different prpsinfo32 compared to most other Linux |
| 1758 | archs. */ |
| 1759 | if (tdep->wordsize == 4) |
| 1760 | set_gdbarch_elfcore_write_linux_prpsinfo (gdbarch, |
| 1761 | elfcore_write_ppc_linux_prpsinfo32); |
| 1762 | |
| 1763 | set_gdbarch_core_read_description (gdbarch, ppc_linux_core_read_description); |
| 1764 | set_gdbarch_iterate_over_regset_sections (gdbarch, |
| 1765 | ppc_linux_iterate_over_regset_sections); |
| 1766 | |
| 1767 | /* Enable TLS support. */ |
| 1768 | set_gdbarch_fetch_tls_load_module_address (gdbarch, |
| 1769 | svr4_fetch_objfile_link_map); |
| 1770 | |
| 1771 | if (tdesc_data) |
| 1772 | { |
| 1773 | const struct tdesc_feature *feature; |
| 1774 | |
| 1775 | /* If we have target-described registers, then we can safely |
| 1776 | reserve a number for PPC_ORIG_R3_REGNUM and PPC_TRAP_REGNUM |
| 1777 | (whether they are described or not). */ |
| 1778 | gdb_assert (gdbarch_num_regs (gdbarch) <= PPC_ORIG_R3_REGNUM); |
| 1779 | set_gdbarch_num_regs (gdbarch, PPC_TRAP_REGNUM + 1); |
| 1780 | |
| 1781 | /* If they are present, then assign them to the reserved number. */ |
| 1782 | feature = tdesc_find_feature (info.target_desc, |
| 1783 | "org.gnu.gdb.power.linux"); |
| 1784 | if (feature != NULL) |
| 1785 | { |
| 1786 | tdesc_numbered_register (feature, tdesc_data, |
| 1787 | PPC_ORIG_R3_REGNUM, "orig_r3"); |
| 1788 | tdesc_numbered_register (feature, tdesc_data, |
| 1789 | PPC_TRAP_REGNUM, "trap"); |
| 1790 | } |
| 1791 | } |
| 1792 | |
| 1793 | /* Enable Cell/B.E. if supported by the target. */ |
| 1794 | if (tdesc_compatible_p (info.target_desc, |
| 1795 | bfd_lookup_arch (bfd_arch_spu, bfd_mach_spu))) |
| 1796 | { |
| 1797 | /* Cell/B.E. multi-architecture support. */ |
| 1798 | set_spu_solib_ops (gdbarch); |
| 1799 | |
| 1800 | /* Cell/B.E. cross-architecture unwinder support. */ |
| 1801 | frame_unwind_prepend_unwinder (gdbarch, &ppu2spu_unwind); |
| 1802 | } |
| 1803 | |
| 1804 | set_gdbarch_displaced_step_location (gdbarch, |
| 1805 | linux_displaced_step_location); |
| 1806 | |
| 1807 | /* Support reverse debugging. */ |
| 1808 | set_gdbarch_process_record (gdbarch, ppc_process_record); |
| 1809 | set_gdbarch_process_record_signal (gdbarch, ppc_linux_record_signal); |
| 1810 | tdep->ppc_syscall_record = ppc_linux_syscall_record; |
| 1811 | |
| 1812 | ppc_init_linux_record_tdep (&ppc_linux_record_tdep, 4); |
| 1813 | ppc_init_linux_record_tdep (&ppc64_linux_record_tdep, 8); |
| 1814 | } |
| 1815 | |
| 1816 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 1817 | extern initialize_file_ftype _initialize_ppc_linux_tdep; |
| 1818 | |
| 1819 | void |
| 1820 | _initialize_ppc_linux_tdep (void) |
| 1821 | { |
| 1822 | /* Register for all sub-familes of the POWER/PowerPC: 32-bit and |
| 1823 | 64-bit PowerPC, and the older rs6k. */ |
| 1824 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_LINUX, |
| 1825 | ppc_linux_init_abi); |
| 1826 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64, GDB_OSABI_LINUX, |
| 1827 | ppc_linux_init_abi); |
| 1828 | gdbarch_register_osabi (bfd_arch_rs6000, bfd_mach_rs6k, GDB_OSABI_LINUX, |
| 1829 | ppc_linux_init_abi); |
| 1830 | |
| 1831 | /* Attach to observers to track __spe_current_active_context. */ |
| 1832 | observer_attach_inferior_created (ppc_linux_spe_context_inferior_created); |
| 1833 | observer_attach_solib_loaded (ppc_linux_spe_context_solib_loaded); |
| 1834 | observer_attach_solib_unloaded (ppc_linux_spe_context_solib_unloaded); |
| 1835 | |
| 1836 | /* Initialize the Linux target descriptions. */ |
| 1837 | initialize_tdesc_powerpc_32l (); |
| 1838 | initialize_tdesc_powerpc_altivec32l (); |
| 1839 | initialize_tdesc_powerpc_cell32l (); |
| 1840 | initialize_tdesc_powerpc_vsx32l (); |
| 1841 | initialize_tdesc_powerpc_isa205_32l (); |
| 1842 | initialize_tdesc_powerpc_isa205_altivec32l (); |
| 1843 | initialize_tdesc_powerpc_isa205_vsx32l (); |
| 1844 | initialize_tdesc_powerpc_64l (); |
| 1845 | initialize_tdesc_powerpc_altivec64l (); |
| 1846 | initialize_tdesc_powerpc_cell64l (); |
| 1847 | initialize_tdesc_powerpc_vsx64l (); |
| 1848 | initialize_tdesc_powerpc_isa205_64l (); |
| 1849 | initialize_tdesc_powerpc_isa205_altivec64l (); |
| 1850 | initialize_tdesc_powerpc_isa205_vsx64l (); |
| 1851 | initialize_tdesc_powerpc_e500l (); |
| 1852 | } |