| 1 | /* Target-dependent code for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986-2014 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 | |
| 53 | #include "stap-probe.h" |
| 54 | #include "ax.h" |
| 55 | #include "ax-gdb.h" |
| 56 | #include "cli/cli-utils.h" |
| 57 | #include "parser-defs.h" |
| 58 | #include "user-regs.h" |
| 59 | #include <ctype.h> |
| 60 | #include "elf-bfd.h" /* for elfcore_write_* */ |
| 61 | |
| 62 | #include "features/rs6000/powerpc-32l.c" |
| 63 | #include "features/rs6000/powerpc-altivec32l.c" |
| 64 | #include "features/rs6000/powerpc-cell32l.c" |
| 65 | #include "features/rs6000/powerpc-vsx32l.c" |
| 66 | #include "features/rs6000/powerpc-isa205-32l.c" |
| 67 | #include "features/rs6000/powerpc-isa205-altivec32l.c" |
| 68 | #include "features/rs6000/powerpc-isa205-vsx32l.c" |
| 69 | #include "features/rs6000/powerpc-64l.c" |
| 70 | #include "features/rs6000/powerpc-altivec64l.c" |
| 71 | #include "features/rs6000/powerpc-cell64l.c" |
| 72 | #include "features/rs6000/powerpc-vsx64l.c" |
| 73 | #include "features/rs6000/powerpc-isa205-64l.c" |
| 74 | #include "features/rs6000/powerpc-isa205-altivec64l.c" |
| 75 | #include "features/rs6000/powerpc-isa205-vsx64l.c" |
| 76 | #include "features/rs6000/powerpc-e500l.c" |
| 77 | |
| 78 | /* Shared library operations for PowerPC-Linux. */ |
| 79 | static struct target_so_ops powerpc_so_ops; |
| 80 | |
| 81 | /* The syscall's XML filename for PPC and PPC64. */ |
| 82 | #define XML_SYSCALL_FILENAME_PPC "syscalls/ppc-linux.xml" |
| 83 | #define XML_SYSCALL_FILENAME_PPC64 "syscalls/ppc64-linux.xml" |
| 84 | |
| 85 | /* ppc_linux_memory_remove_breakpoints attempts to remove a breakpoint |
| 86 | in much the same fashion as memory_remove_breakpoint in mem-break.c, |
| 87 | but is careful not to write back the previous contents if the code |
| 88 | in question has changed in between inserting the breakpoint and |
| 89 | removing it. |
| 90 | |
| 91 | Here is the problem that we're trying to solve... |
| 92 | |
| 93 | Once upon a time, before introducing this function to remove |
| 94 | breakpoints from the inferior, setting a breakpoint on a shared |
| 95 | library function prior to running the program would not work |
| 96 | properly. In order to understand the problem, it is first |
| 97 | necessary to understand a little bit about dynamic linking on |
| 98 | this platform. |
| 99 | |
| 100 | A call to a shared library function is accomplished via a bl |
| 101 | (branch-and-link) instruction whose branch target is an entry |
| 102 | in the procedure linkage table (PLT). The PLT in the object |
| 103 | file is uninitialized. To gdb, prior to running the program, the |
| 104 | entries in the PLT are all zeros. |
| 105 | |
| 106 | Once the program starts running, the shared libraries are loaded |
| 107 | and the procedure linkage table is initialized, but the entries in |
| 108 | the table are not (necessarily) resolved. Once a function is |
| 109 | actually called, the code in the PLT is hit and the function is |
| 110 | resolved. In order to better illustrate this, an example is in |
| 111 | order; the following example is from the gdb testsuite. |
| 112 | |
| 113 | We start the program shmain. |
| 114 | |
| 115 | [kev@arroyo testsuite]$ ../gdb gdb.base/shmain |
| 116 | [...] |
| 117 | |
| 118 | We place two breakpoints, one on shr1 and the other on main. |
| 119 | |
| 120 | (gdb) b shr1 |
| 121 | Breakpoint 1 at 0x100409d4 |
| 122 | (gdb) b main |
| 123 | Breakpoint 2 at 0x100006a0: file gdb.base/shmain.c, line 44. |
| 124 | |
| 125 | Examine the instruction (and the immediatly following instruction) |
| 126 | upon which the breakpoint was placed. Note that the PLT entry |
| 127 | for shr1 contains zeros. |
| 128 | |
| 129 | (gdb) x/2i 0x100409d4 |
| 130 | 0x100409d4 <shr1>: .long 0x0 |
| 131 | 0x100409d8 <shr1+4>: .long 0x0 |
| 132 | |
| 133 | Now run 'til main. |
| 134 | |
| 135 | (gdb) r |
| 136 | Starting program: gdb.base/shmain |
| 137 | Breakpoint 1 at 0xffaf790: file gdb.base/shr1.c, line 19. |
| 138 | |
| 139 | Breakpoint 2, main () |
| 140 | at gdb.base/shmain.c:44 |
| 141 | 44 g = 1; |
| 142 | |
| 143 | Examine the PLT again. Note that the loading of the shared |
| 144 | library has initialized the PLT to code which loads a constant |
| 145 | (which I think is an index into the GOT) into r11 and then |
| 146 | branchs a short distance to the code which actually does the |
| 147 | resolving. |
| 148 | |
| 149 | (gdb) x/2i 0x100409d4 |
| 150 | 0x100409d4 <shr1>: li r11,4 |
| 151 | 0x100409d8 <shr1+4>: b 0x10040984 <sg+4> |
| 152 | (gdb) c |
| 153 | Continuing. |
| 154 | |
| 155 | Breakpoint 1, shr1 (x=1) |
| 156 | at gdb.base/shr1.c:19 |
| 157 | 19 l = 1; |
| 158 | |
| 159 | Now we've hit the breakpoint at shr1. (The breakpoint was |
| 160 | reset from the PLT entry to the actual shr1 function after the |
| 161 | shared library was loaded.) Note that the PLT entry has been |
| 162 | resolved to contain a branch that takes us directly to shr1. |
| 163 | (The real one, not the PLT entry.) |
| 164 | |
| 165 | (gdb) x/2i 0x100409d4 |
| 166 | 0x100409d4 <shr1>: b 0xffaf76c <shr1> |
| 167 | 0x100409d8 <shr1+4>: b 0x10040984 <sg+4> |
| 168 | |
| 169 | The thing to note here is that the PLT entry for shr1 has been |
| 170 | changed twice. |
| 171 | |
| 172 | Now the problem should be obvious. GDB places a breakpoint (a |
| 173 | trap instruction) on the zero value of the PLT entry for shr1. |
| 174 | Later on, after the shared library had been loaded and the PLT |
| 175 | initialized, GDB gets a signal indicating this fact and attempts |
| 176 | (as it always does when it stops) to remove all the breakpoints. |
| 177 | |
| 178 | The breakpoint removal was causing the former contents (a zero |
| 179 | word) to be written back to the now initialized PLT entry thus |
| 180 | destroying a portion of the initialization that had occurred only a |
| 181 | short time ago. When execution continued, the zero word would be |
| 182 | executed as an instruction an illegal instruction trap was |
| 183 | generated instead. (0 is not a legal instruction.) |
| 184 | |
| 185 | The fix for this problem was fairly straightforward. The function |
| 186 | memory_remove_breakpoint from mem-break.c was copied to this file, |
| 187 | modified slightly, and renamed to ppc_linux_memory_remove_breakpoint. |
| 188 | In tm-linux.h, MEMORY_REMOVE_BREAKPOINT is defined to call this new |
| 189 | function. |
| 190 | |
| 191 | The differences between ppc_linux_memory_remove_breakpoint () and |
| 192 | memory_remove_breakpoint () are minor. All that the former does |
| 193 | that the latter does not is check to make sure that the breakpoint |
| 194 | location actually contains a breakpoint (trap instruction) prior |
| 195 | to attempting to write back the old contents. If it does contain |
| 196 | a trap instruction, we allow the old contents to be written back. |
| 197 | Otherwise, we silently do nothing. |
| 198 | |
| 199 | The big question is whether memory_remove_breakpoint () should be |
| 200 | changed to have the same functionality. The downside is that more |
| 201 | traffic is generated for remote targets since we'll have an extra |
| 202 | fetch of a memory word each time a breakpoint is removed. |
| 203 | |
| 204 | For the time being, we'll leave this self-modifying-code-friendly |
| 205 | version in ppc-linux-tdep.c, but it ought to be migrated somewhere |
| 206 | else in the event that some other platform has similar needs with |
| 207 | regard to removing breakpoints in some potentially self modifying |
| 208 | code. */ |
| 209 | static int |
| 210 | ppc_linux_memory_remove_breakpoint (struct gdbarch *gdbarch, |
| 211 | struct bp_target_info *bp_tgt) |
| 212 | { |
| 213 | CORE_ADDR addr = bp_tgt->reqstd_address; |
| 214 | const unsigned char *bp; |
| 215 | int val; |
| 216 | int bplen; |
| 217 | gdb_byte old_contents[BREAKPOINT_MAX]; |
| 218 | struct cleanup *cleanup; |
| 219 | |
| 220 | /* Determine appropriate breakpoint contents and size for this address. */ |
| 221 | bp = gdbarch_breakpoint_from_pc (gdbarch, &addr, &bplen); |
| 222 | if (bp == NULL) |
| 223 | error (_("Software breakpoints not implemented for this target.")); |
| 224 | |
| 225 | /* Make sure we see the memory breakpoints. */ |
| 226 | cleanup = make_show_memory_breakpoints_cleanup (1); |
| 227 | val = target_read_memory (addr, old_contents, bplen); |
| 228 | |
| 229 | /* If our breakpoint is no longer at the address, this means that the |
| 230 | program modified the code on us, so it is wrong to put back the |
| 231 | old value. */ |
| 232 | if (val == 0 && memcmp (bp, old_contents, bplen) == 0) |
| 233 | val = target_write_raw_memory (addr, bp_tgt->shadow_contents, bplen); |
| 234 | |
| 235 | do_cleanups (cleanup); |
| 236 | return val; |
| 237 | } |
| 238 | |
| 239 | /* For historic reasons, PPC 32 GNU/Linux follows PowerOpen rather |
| 240 | than the 32 bit SYSV R4 ABI structure return convention - all |
| 241 | structures, no matter their size, are put in memory. Vectors, |
| 242 | which were added later, do get returned in a register though. */ |
| 243 | |
| 244 | static enum return_value_convention |
| 245 | ppc_linux_return_value (struct gdbarch *gdbarch, struct value *function, |
| 246 | struct type *valtype, struct regcache *regcache, |
| 247 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 248 | { |
| 249 | if ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT |
| 250 | || TYPE_CODE (valtype) == TYPE_CODE_UNION) |
| 251 | && !((TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 8) |
| 252 | && TYPE_VECTOR (valtype))) |
| 253 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 254 | else |
| 255 | return ppc_sysv_abi_return_value (gdbarch, function, valtype, regcache, |
| 256 | readbuf, writebuf); |
| 257 | } |
| 258 | |
| 259 | /* PLT stub in executable. */ |
| 260 | static struct ppc_insn_pattern powerpc32_plt_stub[] = |
| 261 | { |
| 262 | { 0xffff0000, 0x3d600000, 0 }, /* lis r11, xxxx */ |
| 263 | { 0xffff0000, 0x816b0000, 0 }, /* lwz r11, xxxx(r11) */ |
| 264 | { 0xffffffff, 0x7d6903a6, 0 }, /* mtctr r11 */ |
| 265 | { 0xffffffff, 0x4e800420, 0 }, /* bctr */ |
| 266 | { 0, 0, 0 } |
| 267 | }; |
| 268 | |
| 269 | /* PLT stub in shared library. */ |
| 270 | static struct ppc_insn_pattern powerpc32_plt_stub_so[] = |
| 271 | { |
| 272 | { 0xffff0000, 0x817e0000, 0 }, /* lwz r11, xxxx(r30) */ |
| 273 | { 0xffffffff, 0x7d6903a6, 0 }, /* mtctr r11 */ |
| 274 | { 0xffffffff, 0x4e800420, 0 }, /* bctr */ |
| 275 | { 0xffffffff, 0x60000000, 0 }, /* nop */ |
| 276 | { 0, 0, 0 } |
| 277 | }; |
| 278 | #define POWERPC32_PLT_STUB_LEN ARRAY_SIZE (powerpc32_plt_stub) |
| 279 | |
| 280 | /* Check if PC is in PLT stub. For non-secure PLT, stub is in .plt |
| 281 | section. For secure PLT, stub is in .text and we need to check |
| 282 | instruction patterns. */ |
| 283 | |
| 284 | static int |
| 285 | powerpc_linux_in_dynsym_resolve_code (CORE_ADDR pc) |
| 286 | { |
| 287 | struct bound_minimal_symbol sym; |
| 288 | |
| 289 | /* Check whether PC is in the dynamic linker. This also checks |
| 290 | whether it is in the .plt section, used by non-PIC executables. */ |
| 291 | if (svr4_in_dynsym_resolve_code (pc)) |
| 292 | return 1; |
| 293 | |
| 294 | /* Check if we are in the resolver. */ |
| 295 | sym = lookup_minimal_symbol_by_pc (pc); |
| 296 | if (sym.minsym != NULL |
| 297 | && (strcmp (MSYMBOL_LINKAGE_NAME (sym.minsym), "__glink") == 0 |
| 298 | || strcmp (MSYMBOL_LINKAGE_NAME (sym.minsym), |
| 299 | "__glink_PLTresolve") == 0)) |
| 300 | return 1; |
| 301 | |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | /* Follow PLT stub to actual routine. */ |
| 306 | |
| 307 | static CORE_ADDR |
| 308 | ppc_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
| 309 | { |
| 310 | unsigned int insnbuf[POWERPC32_PLT_STUB_LEN]; |
| 311 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 312 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 313 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 314 | CORE_ADDR target = 0; |
| 315 | |
| 316 | if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub, insnbuf)) |
| 317 | { |
| 318 | /* Insn pattern is |
| 319 | lis r11, xxxx |
| 320 | lwz r11, xxxx(r11) |
| 321 | Branch target is in r11. */ |
| 322 | |
| 323 | target = (ppc_insn_d_field (insnbuf[0]) << 16) |
| 324 | | ppc_insn_d_field (insnbuf[1]); |
| 325 | target = read_memory_unsigned_integer (target, 4, byte_order); |
| 326 | } |
| 327 | |
| 328 | if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub_so, insnbuf)) |
| 329 | { |
| 330 | /* Insn pattern is |
| 331 | lwz r11, xxxx(r30) |
| 332 | Branch target is in r11. */ |
| 333 | |
| 334 | target = get_frame_register_unsigned (frame, tdep->ppc_gp0_regnum + 30) |
| 335 | + ppc_insn_d_field (insnbuf[0]); |
| 336 | target = read_memory_unsigned_integer (target, 4, byte_order); |
| 337 | } |
| 338 | |
| 339 | return target; |
| 340 | } |
| 341 | |
| 342 | /* Wrappers to handle Linux-only registers. */ |
| 343 | |
| 344 | static void |
| 345 | ppc_linux_supply_gregset (const struct regset *regset, |
| 346 | struct regcache *regcache, |
| 347 | int regnum, const void *gregs, size_t len) |
| 348 | { |
| 349 | const struct ppc_reg_offsets *offsets = regset->regmap; |
| 350 | |
| 351 | ppc_supply_gregset (regset, regcache, regnum, gregs, len); |
| 352 | |
| 353 | if (ppc_linux_trap_reg_p (get_regcache_arch (regcache))) |
| 354 | { |
| 355 | /* "orig_r3" is stored 2 slots after "pc". */ |
| 356 | if (regnum == -1 || regnum == PPC_ORIG_R3_REGNUM) |
| 357 | ppc_supply_reg (regcache, PPC_ORIG_R3_REGNUM, gregs, |
| 358 | offsets->pc_offset + 2 * offsets->gpr_size, |
| 359 | offsets->gpr_size); |
| 360 | |
| 361 | /* "trap" is stored 8 slots after "pc". */ |
| 362 | if (regnum == -1 || regnum == PPC_TRAP_REGNUM) |
| 363 | ppc_supply_reg (regcache, PPC_TRAP_REGNUM, gregs, |
| 364 | offsets->pc_offset + 8 * offsets->gpr_size, |
| 365 | offsets->gpr_size); |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | static void |
| 370 | ppc_linux_collect_gregset (const struct regset *regset, |
| 371 | const struct regcache *regcache, |
| 372 | int regnum, void *gregs, size_t len) |
| 373 | { |
| 374 | const struct ppc_reg_offsets *offsets = regset->regmap; |
| 375 | |
| 376 | /* Clear areas in the linux gregset not written elsewhere. */ |
| 377 | if (regnum == -1) |
| 378 | memset (gregs, 0, len); |
| 379 | |
| 380 | ppc_collect_gregset (regset, regcache, regnum, gregs, len); |
| 381 | |
| 382 | if (ppc_linux_trap_reg_p (get_regcache_arch (regcache))) |
| 383 | { |
| 384 | /* "orig_r3" is stored 2 slots after "pc". */ |
| 385 | if (regnum == -1 || regnum == PPC_ORIG_R3_REGNUM) |
| 386 | ppc_collect_reg (regcache, PPC_ORIG_R3_REGNUM, gregs, |
| 387 | offsets->pc_offset + 2 * offsets->gpr_size, |
| 388 | offsets->gpr_size); |
| 389 | |
| 390 | /* "trap" is stored 8 slots after "pc". */ |
| 391 | if (regnum == -1 || regnum == PPC_TRAP_REGNUM) |
| 392 | ppc_collect_reg (regcache, PPC_TRAP_REGNUM, gregs, |
| 393 | offsets->pc_offset + 8 * offsets->gpr_size, |
| 394 | offsets->gpr_size); |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | /* Regset descriptions. */ |
| 399 | static const struct ppc_reg_offsets ppc32_linux_reg_offsets = |
| 400 | { |
| 401 | /* General-purpose registers. */ |
| 402 | /* .r0_offset = */ 0, |
| 403 | /* .gpr_size = */ 4, |
| 404 | /* .xr_size = */ 4, |
| 405 | /* .pc_offset = */ 128, |
| 406 | /* .ps_offset = */ 132, |
| 407 | /* .cr_offset = */ 152, |
| 408 | /* .lr_offset = */ 144, |
| 409 | /* .ctr_offset = */ 140, |
| 410 | /* .xer_offset = */ 148, |
| 411 | /* .mq_offset = */ 156, |
| 412 | |
| 413 | /* Floating-point registers. */ |
| 414 | /* .f0_offset = */ 0, |
| 415 | /* .fpscr_offset = */ 256, |
| 416 | /* .fpscr_size = */ 8, |
| 417 | |
| 418 | /* AltiVec registers. */ |
| 419 | /* .vr0_offset = */ 0, |
| 420 | /* .vscr_offset = */ 512 + 12, |
| 421 | /* .vrsave_offset = */ 528 |
| 422 | }; |
| 423 | |
| 424 | static const struct ppc_reg_offsets ppc64_linux_reg_offsets = |
| 425 | { |
| 426 | /* General-purpose registers. */ |
| 427 | /* .r0_offset = */ 0, |
| 428 | /* .gpr_size = */ 8, |
| 429 | /* .xr_size = */ 8, |
| 430 | /* .pc_offset = */ 256, |
| 431 | /* .ps_offset = */ 264, |
| 432 | /* .cr_offset = */ 304, |
| 433 | /* .lr_offset = */ 288, |
| 434 | /* .ctr_offset = */ 280, |
| 435 | /* .xer_offset = */ 296, |
| 436 | /* .mq_offset = */ 312, |
| 437 | |
| 438 | /* Floating-point registers. */ |
| 439 | /* .f0_offset = */ 0, |
| 440 | /* .fpscr_offset = */ 256, |
| 441 | /* .fpscr_size = */ 8, |
| 442 | |
| 443 | /* AltiVec registers. */ |
| 444 | /* .vr0_offset = */ 0, |
| 445 | /* .vscr_offset = */ 512 + 12, |
| 446 | /* .vrsave_offset = */ 528 |
| 447 | }; |
| 448 | |
| 449 | static const struct regset ppc32_linux_gregset = { |
| 450 | &ppc32_linux_reg_offsets, |
| 451 | ppc_linux_supply_gregset, |
| 452 | ppc_linux_collect_gregset |
| 453 | }; |
| 454 | |
| 455 | static const struct regset ppc64_linux_gregset = { |
| 456 | &ppc64_linux_reg_offsets, |
| 457 | ppc_linux_supply_gregset, |
| 458 | ppc_linux_collect_gregset |
| 459 | }; |
| 460 | |
| 461 | static const struct regset ppc32_linux_fpregset = { |
| 462 | &ppc32_linux_reg_offsets, |
| 463 | ppc_supply_fpregset, |
| 464 | ppc_collect_fpregset |
| 465 | }; |
| 466 | |
| 467 | static const struct regset ppc32_linux_vrregset = { |
| 468 | &ppc32_linux_reg_offsets, |
| 469 | ppc_supply_vrregset, |
| 470 | ppc_collect_vrregset |
| 471 | }; |
| 472 | |
| 473 | static const struct regset ppc32_linux_vsxregset = { |
| 474 | &ppc32_linux_reg_offsets, |
| 475 | ppc_supply_vsxregset, |
| 476 | ppc_collect_vsxregset |
| 477 | }; |
| 478 | |
| 479 | const struct regset * |
| 480 | ppc_linux_gregset (int wordsize) |
| 481 | { |
| 482 | return wordsize == 8 ? &ppc64_linux_gregset : &ppc32_linux_gregset; |
| 483 | } |
| 484 | |
| 485 | const struct regset * |
| 486 | ppc_linux_fpregset (void) |
| 487 | { |
| 488 | return &ppc32_linux_fpregset; |
| 489 | } |
| 490 | |
| 491 | /* Iterate over supported core file register note sections. */ |
| 492 | |
| 493 | static void |
| 494 | ppc_linux_iterate_over_regset_sections (struct gdbarch *gdbarch, |
| 495 | iterate_over_regset_sections_cb *cb, |
| 496 | void *cb_data, |
| 497 | const struct regcache *regcache) |
| 498 | { |
| 499 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 500 | int have_altivec = tdep->ppc_vr0_regnum != -1; |
| 501 | int have_vsx = tdep->ppc_vsr0_upper_regnum != -1; |
| 502 | |
| 503 | if (tdep->wordsize == 4) |
| 504 | cb (".reg", 48 * 4, &ppc32_linux_gregset, NULL, cb_data); |
| 505 | else |
| 506 | cb (".reg", 48 * 8, &ppc64_linux_gregset, NULL, cb_data); |
| 507 | |
| 508 | cb (".reg2", 264, &ppc32_linux_fpregset, NULL, cb_data); |
| 509 | |
| 510 | if (have_altivec) |
| 511 | cb (".reg-ppc-vmx", 544, &ppc32_linux_vrregset, "ppc Altivec", cb_data); |
| 512 | |
| 513 | if (have_vsx) |
| 514 | cb (".reg-ppc-vsx", 256, &ppc32_linux_vsxregset, "POWER7 VSX", cb_data); |
| 515 | } |
| 516 | |
| 517 | static void |
| 518 | ppc_linux_sigtramp_cache (struct frame_info *this_frame, |
| 519 | struct trad_frame_cache *this_cache, |
| 520 | CORE_ADDR func, LONGEST offset, |
| 521 | int bias) |
| 522 | { |
| 523 | CORE_ADDR base; |
| 524 | CORE_ADDR regs; |
| 525 | CORE_ADDR gpregs; |
| 526 | CORE_ADDR fpregs; |
| 527 | int i; |
| 528 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 529 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 530 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 531 | |
| 532 | base = get_frame_register_unsigned (this_frame, |
| 533 | gdbarch_sp_regnum (gdbarch)); |
| 534 | if (bias > 0 && get_frame_pc (this_frame) != func) |
| 535 | /* See below, some signal trampolines increment the stack as their |
| 536 | first instruction, need to compensate for that. */ |
| 537 | base -= bias; |
| 538 | |
| 539 | /* Find the address of the register buffer pointer. */ |
| 540 | regs = base + offset; |
| 541 | /* Use that to find the address of the corresponding register |
| 542 | buffers. */ |
| 543 | gpregs = read_memory_unsigned_integer (regs, tdep->wordsize, byte_order); |
| 544 | fpregs = gpregs + 48 * tdep->wordsize; |
| 545 | |
| 546 | /* General purpose. */ |
| 547 | for (i = 0; i < 32; i++) |
| 548 | { |
| 549 | int regnum = i + tdep->ppc_gp0_regnum; |
| 550 | trad_frame_set_reg_addr (this_cache, |
| 551 | regnum, gpregs + i * tdep->wordsize); |
| 552 | } |
| 553 | trad_frame_set_reg_addr (this_cache, |
| 554 | gdbarch_pc_regnum (gdbarch), |
| 555 | gpregs + 32 * tdep->wordsize); |
| 556 | trad_frame_set_reg_addr (this_cache, tdep->ppc_ctr_regnum, |
| 557 | gpregs + 35 * tdep->wordsize); |
| 558 | trad_frame_set_reg_addr (this_cache, tdep->ppc_lr_regnum, |
| 559 | gpregs + 36 * tdep->wordsize); |
| 560 | trad_frame_set_reg_addr (this_cache, tdep->ppc_xer_regnum, |
| 561 | gpregs + 37 * tdep->wordsize); |
| 562 | trad_frame_set_reg_addr (this_cache, tdep->ppc_cr_regnum, |
| 563 | gpregs + 38 * tdep->wordsize); |
| 564 | |
| 565 | if (ppc_linux_trap_reg_p (gdbarch)) |
| 566 | { |
| 567 | trad_frame_set_reg_addr (this_cache, PPC_ORIG_R3_REGNUM, |
| 568 | gpregs + 34 * tdep->wordsize); |
| 569 | trad_frame_set_reg_addr (this_cache, PPC_TRAP_REGNUM, |
| 570 | gpregs + 40 * tdep->wordsize); |
| 571 | } |
| 572 | |
| 573 | if (ppc_floating_point_unit_p (gdbarch)) |
| 574 | { |
| 575 | /* Floating point registers. */ |
| 576 | for (i = 0; i < 32; i++) |
| 577 | { |
| 578 | int regnum = i + gdbarch_fp0_regnum (gdbarch); |
| 579 | trad_frame_set_reg_addr (this_cache, regnum, |
| 580 | fpregs + i * tdep->wordsize); |
| 581 | } |
| 582 | trad_frame_set_reg_addr (this_cache, tdep->ppc_fpscr_regnum, |
| 583 | fpregs + 32 * tdep->wordsize); |
| 584 | } |
| 585 | trad_frame_set_id (this_cache, frame_id_build (base, func)); |
| 586 | } |
| 587 | |
| 588 | static void |
| 589 | ppc32_linux_sigaction_cache_init (const struct tramp_frame *self, |
| 590 | struct frame_info *this_frame, |
| 591 | struct trad_frame_cache *this_cache, |
| 592 | CORE_ADDR func) |
| 593 | { |
| 594 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
| 595 | 0xd0 /* Offset to ucontext_t. */ |
| 596 | + 0x30 /* Offset to .reg. */, |
| 597 | 0); |
| 598 | } |
| 599 | |
| 600 | static void |
| 601 | ppc64_linux_sigaction_cache_init (const struct tramp_frame *self, |
| 602 | struct frame_info *this_frame, |
| 603 | struct trad_frame_cache *this_cache, |
| 604 | CORE_ADDR func) |
| 605 | { |
| 606 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
| 607 | 0x80 /* Offset to ucontext_t. */ |
| 608 | + 0xe0 /* Offset to .reg. */, |
| 609 | 128); |
| 610 | } |
| 611 | |
| 612 | static void |
| 613 | ppc32_linux_sighandler_cache_init (const struct tramp_frame *self, |
| 614 | struct frame_info *this_frame, |
| 615 | struct trad_frame_cache *this_cache, |
| 616 | CORE_ADDR func) |
| 617 | { |
| 618 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
| 619 | 0x40 /* Offset to ucontext_t. */ |
| 620 | + 0x1c /* Offset to .reg. */, |
| 621 | 0); |
| 622 | } |
| 623 | |
| 624 | static void |
| 625 | ppc64_linux_sighandler_cache_init (const struct tramp_frame *self, |
| 626 | struct frame_info *this_frame, |
| 627 | struct trad_frame_cache *this_cache, |
| 628 | CORE_ADDR func) |
| 629 | { |
| 630 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
| 631 | 0x80 /* Offset to struct sigcontext. */ |
| 632 | + 0x38 /* Offset to .reg. */, |
| 633 | 128); |
| 634 | } |
| 635 | |
| 636 | static struct tramp_frame ppc32_linux_sigaction_tramp_frame = { |
| 637 | SIGTRAMP_FRAME, |
| 638 | 4, |
| 639 | { |
| 640 | { 0x380000ac, -1 }, /* li r0, 172 */ |
| 641 | { 0x44000002, -1 }, /* sc */ |
| 642 | { TRAMP_SENTINEL_INSN }, |
| 643 | }, |
| 644 | ppc32_linux_sigaction_cache_init |
| 645 | }; |
| 646 | static struct tramp_frame ppc64_linux_sigaction_tramp_frame = { |
| 647 | SIGTRAMP_FRAME, |
| 648 | 4, |
| 649 | { |
| 650 | { 0x38210080, -1 }, /* addi r1,r1,128 */ |
| 651 | { 0x380000ac, -1 }, /* li r0, 172 */ |
| 652 | { 0x44000002, -1 }, /* sc */ |
| 653 | { TRAMP_SENTINEL_INSN }, |
| 654 | }, |
| 655 | ppc64_linux_sigaction_cache_init |
| 656 | }; |
| 657 | static struct tramp_frame ppc32_linux_sighandler_tramp_frame = { |
| 658 | SIGTRAMP_FRAME, |
| 659 | 4, |
| 660 | { |
| 661 | { 0x38000077, -1 }, /* li r0,119 */ |
| 662 | { 0x44000002, -1 }, /* sc */ |
| 663 | { TRAMP_SENTINEL_INSN }, |
| 664 | }, |
| 665 | ppc32_linux_sighandler_cache_init |
| 666 | }; |
| 667 | static struct tramp_frame ppc64_linux_sighandler_tramp_frame = { |
| 668 | SIGTRAMP_FRAME, |
| 669 | 4, |
| 670 | { |
| 671 | { 0x38210080, -1 }, /* addi r1,r1,128 */ |
| 672 | { 0x38000077, -1 }, /* li r0,119 */ |
| 673 | { 0x44000002, -1 }, /* sc */ |
| 674 | { TRAMP_SENTINEL_INSN }, |
| 675 | }, |
| 676 | ppc64_linux_sighandler_cache_init |
| 677 | }; |
| 678 | |
| 679 | |
| 680 | /* Address to use for displaced stepping. When debugging a stand-alone |
| 681 | SPU executable, entry_point_address () will point to an SPU local-store |
| 682 | address and is thus not usable as displaced stepping location. We use |
| 683 | the auxiliary vector to determine the PowerPC-side entry point address |
| 684 | instead. */ |
| 685 | |
| 686 | static CORE_ADDR ppc_linux_entry_point_addr = 0; |
| 687 | |
| 688 | static void |
| 689 | ppc_linux_inferior_created (struct target_ops *target, int from_tty) |
| 690 | { |
| 691 | ppc_linux_entry_point_addr = 0; |
| 692 | } |
| 693 | |
| 694 | static CORE_ADDR |
| 695 | ppc_linux_displaced_step_location (struct gdbarch *gdbarch) |
| 696 | { |
| 697 | if (ppc_linux_entry_point_addr == 0) |
| 698 | { |
| 699 | CORE_ADDR addr; |
| 700 | |
| 701 | /* Determine entry point from target auxiliary vector. */ |
| 702 | if (target_auxv_search (¤t_target, AT_ENTRY, &addr) <= 0) |
| 703 | error (_("Cannot find AT_ENTRY auxiliary vector entry.")); |
| 704 | |
| 705 | /* Make certain that the address points at real code, and not a |
| 706 | function descriptor. */ |
| 707 | addr = gdbarch_convert_from_func_ptr_addr (gdbarch, addr, |
| 708 | ¤t_target); |
| 709 | |
| 710 | /* Inferior calls also use the entry point as a breakpoint location. |
| 711 | We don't want displaced stepping to interfere with those |
| 712 | breakpoints, so leave space. */ |
| 713 | ppc_linux_entry_point_addr = addr + 2 * PPC_INSN_SIZE; |
| 714 | } |
| 715 | |
| 716 | return ppc_linux_entry_point_addr; |
| 717 | } |
| 718 | |
| 719 | |
| 720 | /* Return 1 if PPC_ORIG_R3_REGNUM and PPC_TRAP_REGNUM are usable. */ |
| 721 | int |
| 722 | ppc_linux_trap_reg_p (struct gdbarch *gdbarch) |
| 723 | { |
| 724 | /* If we do not have a target description with registers, then |
| 725 | the special registers will not be included in the register set. */ |
| 726 | if (!tdesc_has_registers (gdbarch_target_desc (gdbarch))) |
| 727 | return 0; |
| 728 | |
| 729 | /* If we do, then it is safe to check the size. */ |
| 730 | return register_size (gdbarch, PPC_ORIG_R3_REGNUM) > 0 |
| 731 | && register_size (gdbarch, PPC_TRAP_REGNUM) > 0; |
| 732 | } |
| 733 | |
| 734 | /* Return the current system call's number present in the |
| 735 | r0 register. When the function fails, it returns -1. */ |
| 736 | static LONGEST |
| 737 | ppc_linux_get_syscall_number (struct gdbarch *gdbarch, |
| 738 | ptid_t ptid) |
| 739 | { |
| 740 | struct regcache *regcache = get_thread_regcache (ptid); |
| 741 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 742 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 743 | struct cleanup *cleanbuf; |
| 744 | /* The content of a register */ |
| 745 | gdb_byte *buf; |
| 746 | /* The result */ |
| 747 | LONGEST ret; |
| 748 | |
| 749 | /* Make sure we're in a 32- or 64-bit machine */ |
| 750 | gdb_assert (tdep->wordsize == 4 || tdep->wordsize == 8); |
| 751 | |
| 752 | buf = (gdb_byte *) xmalloc (tdep->wordsize * sizeof (gdb_byte)); |
| 753 | |
| 754 | cleanbuf = make_cleanup (xfree, buf); |
| 755 | |
| 756 | /* Getting the system call number from the register. |
| 757 | When dealing with PowerPC architecture, this information |
| 758 | is stored at 0th register. */ |
| 759 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum, buf); |
| 760 | |
| 761 | ret = extract_signed_integer (buf, tdep->wordsize, byte_order); |
| 762 | do_cleanups (cleanbuf); |
| 763 | |
| 764 | return ret; |
| 765 | } |
| 766 | |
| 767 | static void |
| 768 | ppc_linux_write_pc (struct regcache *regcache, CORE_ADDR pc) |
| 769 | { |
| 770 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 771 | |
| 772 | regcache_cooked_write_unsigned (regcache, gdbarch_pc_regnum (gdbarch), pc); |
| 773 | |
| 774 | /* Set special TRAP register to -1 to prevent the kernel from |
| 775 | messing with the PC we just installed, if we happen to be |
| 776 | within an interrupted system call that the kernel wants to |
| 777 | restart. |
| 778 | |
| 779 | Note that after we return from the dummy call, the TRAP and |
| 780 | ORIG_R3 registers will be automatically restored, and the |
| 781 | kernel continues to restart the system call at this point. */ |
| 782 | if (ppc_linux_trap_reg_p (gdbarch)) |
| 783 | regcache_cooked_write_unsigned (regcache, PPC_TRAP_REGNUM, -1); |
| 784 | } |
| 785 | |
| 786 | static int |
| 787 | ppc_linux_spu_section (bfd *abfd, asection *asect, void *user_data) |
| 788 | { |
| 789 | return strncmp (bfd_section_name (abfd, asect), "SPU/", 4) == 0; |
| 790 | } |
| 791 | |
| 792 | static const struct target_desc * |
| 793 | ppc_linux_core_read_description (struct gdbarch *gdbarch, |
| 794 | struct target_ops *target, |
| 795 | bfd *abfd) |
| 796 | { |
| 797 | asection *cell = bfd_sections_find_if (abfd, ppc_linux_spu_section, NULL); |
| 798 | asection *altivec = bfd_get_section_by_name (abfd, ".reg-ppc-vmx"); |
| 799 | asection *vsx = bfd_get_section_by_name (abfd, ".reg-ppc-vsx"); |
| 800 | asection *section = bfd_get_section_by_name (abfd, ".reg"); |
| 801 | if (! section) |
| 802 | return NULL; |
| 803 | |
| 804 | switch (bfd_section_size (abfd, section)) |
| 805 | { |
| 806 | case 48 * 4: |
| 807 | if (cell) |
| 808 | return tdesc_powerpc_cell32l; |
| 809 | else if (vsx) |
| 810 | return tdesc_powerpc_vsx32l; |
| 811 | else if (altivec) |
| 812 | return tdesc_powerpc_altivec32l; |
| 813 | else |
| 814 | return tdesc_powerpc_32l; |
| 815 | |
| 816 | case 48 * 8: |
| 817 | if (cell) |
| 818 | return tdesc_powerpc_cell64l; |
| 819 | else if (vsx) |
| 820 | return tdesc_powerpc_vsx64l; |
| 821 | else if (altivec) |
| 822 | return tdesc_powerpc_altivec64l; |
| 823 | else |
| 824 | return tdesc_powerpc_64l; |
| 825 | |
| 826 | default: |
| 827 | return NULL; |
| 828 | } |
| 829 | } |
| 830 | |
| 831 | |
| 832 | /* Implementation of `gdbarch_elf_make_msymbol_special', as defined in |
| 833 | gdbarch.h. This implementation is used for the ELFv2 ABI only. */ |
| 834 | |
| 835 | static void |
| 836 | ppc_elfv2_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym) |
| 837 | { |
| 838 | elf_symbol_type *elf_sym = (elf_symbol_type *)sym; |
| 839 | |
| 840 | /* If the symbol is marked as having a local entry point, set a target |
| 841 | flag in the msymbol. We currently only support local entry point |
| 842 | offsets of 8 bytes, which is the only entry point offset ever used |
| 843 | by current compilers. If/when other offsets are ever used, we will |
| 844 | have to use additional target flag bits to store them. */ |
| 845 | switch (PPC64_LOCAL_ENTRY_OFFSET (elf_sym->internal_elf_sym.st_other)) |
| 846 | { |
| 847 | default: |
| 848 | break; |
| 849 | case 8: |
| 850 | MSYMBOL_TARGET_FLAG_1 (msym) = 1; |
| 851 | break; |
| 852 | } |
| 853 | } |
| 854 | |
| 855 | /* Implementation of `gdbarch_skip_entrypoint', as defined in |
| 856 | gdbarch.h. This implementation is used for the ELFv2 ABI only. */ |
| 857 | |
| 858 | static CORE_ADDR |
| 859 | ppc_elfv2_skip_entrypoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 860 | { |
| 861 | struct bound_minimal_symbol fun; |
| 862 | int local_entry_offset = 0; |
| 863 | |
| 864 | fun = lookup_minimal_symbol_by_pc (pc); |
| 865 | if (fun.minsym == NULL) |
| 866 | return pc; |
| 867 | |
| 868 | /* See ppc_elfv2_elf_make_msymbol_special for how local entry point |
| 869 | offset values are encoded. */ |
| 870 | if (MSYMBOL_TARGET_FLAG_1 (fun.minsym)) |
| 871 | local_entry_offset = 8; |
| 872 | |
| 873 | if (BMSYMBOL_VALUE_ADDRESS (fun) <= pc |
| 874 | && pc < BMSYMBOL_VALUE_ADDRESS (fun) + local_entry_offset) |
| 875 | return BMSYMBOL_VALUE_ADDRESS (fun) + local_entry_offset; |
| 876 | |
| 877 | return pc; |
| 878 | } |
| 879 | |
| 880 | /* Implementation of `gdbarch_stap_is_single_operand', as defined in |
| 881 | gdbarch.h. */ |
| 882 | |
| 883 | static int |
| 884 | ppc_stap_is_single_operand (struct gdbarch *gdbarch, const char *s) |
| 885 | { |
| 886 | return (*s == 'i' /* Literal number. */ |
| 887 | || (isdigit (*s) && s[1] == '(' |
| 888 | && isdigit (s[2])) /* Displacement. */ |
| 889 | || (*s == '(' && isdigit (s[1])) /* Register indirection. */ |
| 890 | || isdigit (*s)); /* Register value. */ |
| 891 | } |
| 892 | |
| 893 | /* Implementation of `gdbarch_stap_parse_special_token', as defined in |
| 894 | gdbarch.h. */ |
| 895 | |
| 896 | static int |
| 897 | ppc_stap_parse_special_token (struct gdbarch *gdbarch, |
| 898 | struct stap_parse_info *p) |
| 899 | { |
| 900 | if (isdigit (*p->arg)) |
| 901 | { |
| 902 | /* This temporary pointer is needed because we have to do a lookahead. |
| 903 | We could be dealing with a register displacement, and in such case |
| 904 | we would not need to do anything. */ |
| 905 | const char *s = p->arg; |
| 906 | char *regname; |
| 907 | int len; |
| 908 | struct stoken str; |
| 909 | |
| 910 | while (isdigit (*s)) |
| 911 | ++s; |
| 912 | |
| 913 | if (*s == '(') |
| 914 | { |
| 915 | /* It is a register displacement indeed. Returning 0 means we are |
| 916 | deferring the treatment of this case to the generic parser. */ |
| 917 | return 0; |
| 918 | } |
| 919 | |
| 920 | len = s - p->arg; |
| 921 | regname = alloca (len + 2); |
| 922 | regname[0] = 'r'; |
| 923 | |
| 924 | strncpy (regname + 1, p->arg, len); |
| 925 | ++len; |
| 926 | regname[len] = '\0'; |
| 927 | |
| 928 | if (user_reg_map_name_to_regnum (gdbarch, regname, len) == -1) |
| 929 | error (_("Invalid register name `%s' on expression `%s'."), |
| 930 | regname, p->saved_arg); |
| 931 | |
| 932 | write_exp_elt_opcode (&p->pstate, OP_REGISTER); |
| 933 | str.ptr = regname; |
| 934 | str.length = len; |
| 935 | write_exp_string (&p->pstate, str); |
| 936 | write_exp_elt_opcode (&p->pstate, OP_REGISTER); |
| 937 | |
| 938 | p->arg = s; |
| 939 | } |
| 940 | else |
| 941 | { |
| 942 | /* All the other tokens should be handled correctly by the generic |
| 943 | parser. */ |
| 944 | return 0; |
| 945 | } |
| 946 | |
| 947 | return 1; |
| 948 | } |
| 949 | |
| 950 | /* Cell/B.E. active SPE context tracking support. */ |
| 951 | |
| 952 | static struct objfile *spe_context_objfile = NULL; |
| 953 | static CORE_ADDR spe_context_lm_addr = 0; |
| 954 | static CORE_ADDR spe_context_offset = 0; |
| 955 | |
| 956 | static ptid_t spe_context_cache_ptid; |
| 957 | static CORE_ADDR spe_context_cache_address; |
| 958 | |
| 959 | /* Hook into inferior_created, solib_loaded, and solib_unloaded observers |
| 960 | to track whether we've loaded a version of libspe2 (as static or dynamic |
| 961 | library) that provides the __spe_current_active_context variable. */ |
| 962 | static void |
| 963 | ppc_linux_spe_context_lookup (struct objfile *objfile) |
| 964 | { |
| 965 | struct bound_minimal_symbol sym; |
| 966 | |
| 967 | if (!objfile) |
| 968 | { |
| 969 | spe_context_objfile = NULL; |
| 970 | spe_context_lm_addr = 0; |
| 971 | spe_context_offset = 0; |
| 972 | spe_context_cache_ptid = minus_one_ptid; |
| 973 | spe_context_cache_address = 0; |
| 974 | return; |
| 975 | } |
| 976 | |
| 977 | sym = lookup_minimal_symbol ("__spe_current_active_context", NULL, objfile); |
| 978 | if (sym.minsym) |
| 979 | { |
| 980 | spe_context_objfile = objfile; |
| 981 | spe_context_lm_addr = svr4_fetch_objfile_link_map (objfile); |
| 982 | spe_context_offset = BMSYMBOL_VALUE_ADDRESS (sym); |
| 983 | spe_context_cache_ptid = minus_one_ptid; |
| 984 | spe_context_cache_address = 0; |
| 985 | return; |
| 986 | } |
| 987 | } |
| 988 | |
| 989 | static void |
| 990 | ppc_linux_spe_context_inferior_created (struct target_ops *t, int from_tty) |
| 991 | { |
| 992 | struct objfile *objfile; |
| 993 | |
| 994 | ppc_linux_spe_context_lookup (NULL); |
| 995 | ALL_OBJFILES (objfile) |
| 996 | ppc_linux_spe_context_lookup (objfile); |
| 997 | } |
| 998 | |
| 999 | static void |
| 1000 | ppc_linux_spe_context_solib_loaded (struct so_list *so) |
| 1001 | { |
| 1002 | if (strstr (so->so_original_name, "/libspe") != NULL) |
| 1003 | { |
| 1004 | solib_read_symbols (so, 0); |
| 1005 | ppc_linux_spe_context_lookup (so->objfile); |
| 1006 | } |
| 1007 | } |
| 1008 | |
| 1009 | static void |
| 1010 | ppc_linux_spe_context_solib_unloaded (struct so_list *so) |
| 1011 | { |
| 1012 | if (so->objfile == spe_context_objfile) |
| 1013 | ppc_linux_spe_context_lookup (NULL); |
| 1014 | } |
| 1015 | |
| 1016 | /* Retrieve contents of the N'th element in the current thread's |
| 1017 | linked SPE context list into ID and NPC. Return the address of |
| 1018 | said context element, or 0 if not found. */ |
| 1019 | static CORE_ADDR |
| 1020 | ppc_linux_spe_context (int wordsize, enum bfd_endian byte_order, |
| 1021 | int n, int *id, unsigned int *npc) |
| 1022 | { |
| 1023 | CORE_ADDR spe_context = 0; |
| 1024 | gdb_byte buf[16]; |
| 1025 | int i; |
| 1026 | |
| 1027 | /* Quick exit if we have not found __spe_current_active_context. */ |
| 1028 | if (!spe_context_objfile) |
| 1029 | return 0; |
| 1030 | |
| 1031 | /* Look up cached address of thread-local variable. */ |
| 1032 | if (!ptid_equal (spe_context_cache_ptid, inferior_ptid)) |
| 1033 | { |
| 1034 | struct target_ops *target = ¤t_target; |
| 1035 | volatile struct gdb_exception ex; |
| 1036 | |
| 1037 | TRY_CATCH (ex, RETURN_MASK_ERROR) |
| 1038 | { |
| 1039 | /* We do not call target_translate_tls_address here, because |
| 1040 | svr4_fetch_objfile_link_map may invalidate the frame chain, |
| 1041 | which must not do while inside a frame sniffer. |
| 1042 | |
| 1043 | Instead, we have cached the lm_addr value, and use that to |
| 1044 | directly call the target's to_get_thread_local_address. */ |
| 1045 | spe_context_cache_address |
| 1046 | = target->to_get_thread_local_address (target, inferior_ptid, |
| 1047 | spe_context_lm_addr, |
| 1048 | spe_context_offset); |
| 1049 | spe_context_cache_ptid = inferior_ptid; |
| 1050 | } |
| 1051 | |
| 1052 | if (ex.reason < 0) |
| 1053 | return 0; |
| 1054 | } |
| 1055 | |
| 1056 | /* Read variable value. */ |
| 1057 | if (target_read_memory (spe_context_cache_address, buf, wordsize) == 0) |
| 1058 | spe_context = extract_unsigned_integer (buf, wordsize, byte_order); |
| 1059 | |
| 1060 | /* Cyle through to N'th linked list element. */ |
| 1061 | for (i = 0; i < n && spe_context; i++) |
| 1062 | if (target_read_memory (spe_context + align_up (12, wordsize), |
| 1063 | buf, wordsize) == 0) |
| 1064 | spe_context = extract_unsigned_integer (buf, wordsize, byte_order); |
| 1065 | else |
| 1066 | spe_context = 0; |
| 1067 | |
| 1068 | /* Read current context. */ |
| 1069 | if (spe_context |
| 1070 | && target_read_memory (spe_context, buf, 12) != 0) |
| 1071 | spe_context = 0; |
| 1072 | |
| 1073 | /* Extract data elements. */ |
| 1074 | if (spe_context) |
| 1075 | { |
| 1076 | if (id) |
| 1077 | *id = extract_signed_integer (buf, 4, byte_order); |
| 1078 | if (npc) |
| 1079 | *npc = extract_unsigned_integer (buf + 4, 4, byte_order); |
| 1080 | } |
| 1081 | |
| 1082 | return spe_context; |
| 1083 | } |
| 1084 | |
| 1085 | |
| 1086 | /* Cell/B.E. cross-architecture unwinder support. */ |
| 1087 | |
| 1088 | struct ppu2spu_cache |
| 1089 | { |
| 1090 | struct frame_id frame_id; |
| 1091 | struct regcache *regcache; |
| 1092 | }; |
| 1093 | |
| 1094 | static struct gdbarch * |
| 1095 | ppu2spu_prev_arch (struct frame_info *this_frame, void **this_cache) |
| 1096 | { |
| 1097 | struct ppu2spu_cache *cache = *this_cache; |
| 1098 | return get_regcache_arch (cache->regcache); |
| 1099 | } |
| 1100 | |
| 1101 | static void |
| 1102 | ppu2spu_this_id (struct frame_info *this_frame, |
| 1103 | void **this_cache, struct frame_id *this_id) |
| 1104 | { |
| 1105 | struct ppu2spu_cache *cache = *this_cache; |
| 1106 | *this_id = cache->frame_id; |
| 1107 | } |
| 1108 | |
| 1109 | static struct value * |
| 1110 | ppu2spu_prev_register (struct frame_info *this_frame, |
| 1111 | void **this_cache, int regnum) |
| 1112 | { |
| 1113 | struct ppu2spu_cache *cache = *this_cache; |
| 1114 | struct gdbarch *gdbarch = get_regcache_arch (cache->regcache); |
| 1115 | gdb_byte *buf; |
| 1116 | |
| 1117 | buf = alloca (register_size (gdbarch, regnum)); |
| 1118 | |
| 1119 | if (regnum < gdbarch_num_regs (gdbarch)) |
| 1120 | regcache_raw_read (cache->regcache, regnum, buf); |
| 1121 | else |
| 1122 | gdbarch_pseudo_register_read (gdbarch, cache->regcache, regnum, buf); |
| 1123 | |
| 1124 | return frame_unwind_got_bytes (this_frame, regnum, buf); |
| 1125 | } |
| 1126 | |
| 1127 | struct ppu2spu_data |
| 1128 | { |
| 1129 | struct gdbarch *gdbarch; |
| 1130 | int id; |
| 1131 | unsigned int npc; |
| 1132 | gdb_byte gprs[128*16]; |
| 1133 | }; |
| 1134 | |
| 1135 | static int |
| 1136 | ppu2spu_unwind_register (void *src, int regnum, gdb_byte *buf) |
| 1137 | { |
| 1138 | struct ppu2spu_data *data = src; |
| 1139 | enum bfd_endian byte_order = gdbarch_byte_order (data->gdbarch); |
| 1140 | |
| 1141 | if (regnum >= 0 && regnum < SPU_NUM_GPRS) |
| 1142 | memcpy (buf, data->gprs + 16*regnum, 16); |
| 1143 | else if (regnum == SPU_ID_REGNUM) |
| 1144 | store_unsigned_integer (buf, 4, byte_order, data->id); |
| 1145 | else if (regnum == SPU_PC_REGNUM) |
| 1146 | store_unsigned_integer (buf, 4, byte_order, data->npc); |
| 1147 | else |
| 1148 | return REG_UNAVAILABLE; |
| 1149 | |
| 1150 | return REG_VALID; |
| 1151 | } |
| 1152 | |
| 1153 | static int |
| 1154 | ppu2spu_sniffer (const struct frame_unwind *self, |
| 1155 | struct frame_info *this_frame, void **this_prologue_cache) |
| 1156 | { |
| 1157 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 1158 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1159 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 1160 | struct ppu2spu_data data; |
| 1161 | struct frame_info *fi; |
| 1162 | CORE_ADDR base, func, backchain, spe_context; |
| 1163 | gdb_byte buf[8]; |
| 1164 | int n = 0; |
| 1165 | |
| 1166 | /* Count the number of SPU contexts already in the frame chain. */ |
| 1167 | for (fi = get_next_frame (this_frame); fi; fi = get_next_frame (fi)) |
| 1168 | if (get_frame_type (fi) == ARCH_FRAME |
| 1169 | && gdbarch_bfd_arch_info (get_frame_arch (fi))->arch == bfd_arch_spu) |
| 1170 | n++; |
| 1171 | |
| 1172 | base = get_frame_sp (this_frame); |
| 1173 | func = get_frame_pc (this_frame); |
| 1174 | if (target_read_memory (base, buf, tdep->wordsize)) |
| 1175 | return 0; |
| 1176 | backchain = extract_unsigned_integer (buf, tdep->wordsize, byte_order); |
| 1177 | |
| 1178 | spe_context = ppc_linux_spe_context (tdep->wordsize, byte_order, |
| 1179 | n, &data.id, &data.npc); |
| 1180 | if (spe_context && base <= spe_context && spe_context < backchain) |
| 1181 | { |
| 1182 | char annex[32]; |
| 1183 | |
| 1184 | /* Find gdbarch for SPU. */ |
| 1185 | struct gdbarch_info info; |
| 1186 | gdbarch_info_init (&info); |
| 1187 | info.bfd_arch_info = bfd_lookup_arch (bfd_arch_spu, bfd_mach_spu); |
| 1188 | info.byte_order = BFD_ENDIAN_BIG; |
| 1189 | info.osabi = GDB_OSABI_LINUX; |
| 1190 | info.tdep_info = (void *) &data.id; |
| 1191 | data.gdbarch = gdbarch_find_by_info (info); |
| 1192 | if (!data.gdbarch) |
| 1193 | return 0; |
| 1194 | |
| 1195 | xsnprintf (annex, sizeof annex, "%d/regs", data.id); |
| 1196 | if (target_read (¤t_target, TARGET_OBJECT_SPU, annex, |
| 1197 | data.gprs, 0, sizeof data.gprs) |
| 1198 | == sizeof data.gprs) |
| 1199 | { |
| 1200 | struct ppu2spu_cache *cache |
| 1201 | = FRAME_OBSTACK_CALLOC (1, struct ppu2spu_cache); |
| 1202 | |
| 1203 | struct address_space *aspace = get_frame_address_space (this_frame); |
| 1204 | struct regcache *regcache = regcache_xmalloc (data.gdbarch, aspace); |
| 1205 | struct cleanup *cleanups = make_cleanup_regcache_xfree (regcache); |
| 1206 | regcache_save (regcache, ppu2spu_unwind_register, &data); |
| 1207 | discard_cleanups (cleanups); |
| 1208 | |
| 1209 | cache->frame_id = frame_id_build (base, func); |
| 1210 | cache->regcache = regcache; |
| 1211 | *this_prologue_cache = cache; |
| 1212 | return 1; |
| 1213 | } |
| 1214 | } |
| 1215 | |
| 1216 | return 0; |
| 1217 | } |
| 1218 | |
| 1219 | static void |
| 1220 | ppu2spu_dealloc_cache (struct frame_info *self, void *this_cache) |
| 1221 | { |
| 1222 | struct ppu2spu_cache *cache = this_cache; |
| 1223 | regcache_xfree (cache->regcache); |
| 1224 | } |
| 1225 | |
| 1226 | static const struct frame_unwind ppu2spu_unwind = { |
| 1227 | ARCH_FRAME, |
| 1228 | default_frame_unwind_stop_reason, |
| 1229 | ppu2spu_this_id, |
| 1230 | ppu2spu_prev_register, |
| 1231 | NULL, |
| 1232 | ppu2spu_sniffer, |
| 1233 | ppu2spu_dealloc_cache, |
| 1234 | ppu2spu_prev_arch, |
| 1235 | }; |
| 1236 | |
| 1237 | |
| 1238 | static void |
| 1239 | ppc_linux_init_abi (struct gdbarch_info info, |
| 1240 | struct gdbarch *gdbarch) |
| 1241 | { |
| 1242 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1243 | struct tdesc_arch_data *tdesc_data = (void *) info.tdep_info; |
| 1244 | static const char *const stap_integer_prefixes[] = { "i", NULL }; |
| 1245 | static const char *const stap_register_indirection_prefixes[] = { "(", |
| 1246 | NULL }; |
| 1247 | static const char *const stap_register_indirection_suffixes[] = { ")", |
| 1248 | NULL }; |
| 1249 | |
| 1250 | linux_init_abi (info, gdbarch); |
| 1251 | |
| 1252 | /* PPC GNU/Linux uses either 64-bit or 128-bit long doubles; where |
| 1253 | 128-bit, they are IBM long double, not IEEE quad long double as |
| 1254 | in the System V ABI PowerPC Processor Supplement. We can safely |
| 1255 | let them default to 128-bit, since the debug info will give the |
| 1256 | size of type actually used in each case. */ |
| 1257 | set_gdbarch_long_double_bit (gdbarch, 16 * TARGET_CHAR_BIT); |
| 1258 | set_gdbarch_long_double_format (gdbarch, floatformats_ibm_long_double); |
| 1259 | |
| 1260 | /* Handle inferior calls during interrupted system calls. */ |
| 1261 | set_gdbarch_write_pc (gdbarch, ppc_linux_write_pc); |
| 1262 | |
| 1263 | /* Get the syscall number from the arch's register. */ |
| 1264 | set_gdbarch_get_syscall_number (gdbarch, ppc_linux_get_syscall_number); |
| 1265 | |
| 1266 | /* SystemTap functions. */ |
| 1267 | set_gdbarch_stap_integer_prefixes (gdbarch, stap_integer_prefixes); |
| 1268 | set_gdbarch_stap_register_indirection_prefixes (gdbarch, |
| 1269 | stap_register_indirection_prefixes); |
| 1270 | set_gdbarch_stap_register_indirection_suffixes (gdbarch, |
| 1271 | stap_register_indirection_suffixes); |
| 1272 | set_gdbarch_stap_gdb_register_prefix (gdbarch, "r"); |
| 1273 | set_gdbarch_stap_is_single_operand (gdbarch, ppc_stap_is_single_operand); |
| 1274 | set_gdbarch_stap_parse_special_token (gdbarch, |
| 1275 | ppc_stap_parse_special_token); |
| 1276 | |
| 1277 | if (tdep->wordsize == 4) |
| 1278 | { |
| 1279 | /* Until November 2001, gcc did not comply with the 32 bit SysV |
| 1280 | R4 ABI requirement that structures less than or equal to 8 |
| 1281 | bytes should be returned in registers. Instead GCC was using |
| 1282 | the AIX/PowerOpen ABI - everything returned in memory |
| 1283 | (well ignoring vectors that is). When this was corrected, it |
| 1284 | wasn't fixed for GNU/Linux native platform. Use the |
| 1285 | PowerOpen struct convention. */ |
| 1286 | set_gdbarch_return_value (gdbarch, ppc_linux_return_value); |
| 1287 | |
| 1288 | set_gdbarch_memory_remove_breakpoint (gdbarch, |
| 1289 | ppc_linux_memory_remove_breakpoint); |
| 1290 | |
| 1291 | /* Shared library handling. */ |
| 1292 | set_gdbarch_skip_trampoline_code (gdbarch, ppc_skip_trampoline_code); |
| 1293 | set_solib_svr4_fetch_link_map_offsets |
| 1294 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| 1295 | |
| 1296 | /* Setting the correct XML syscall filename. */ |
| 1297 | set_xml_syscall_file_name (XML_SYSCALL_FILENAME_PPC); |
| 1298 | |
| 1299 | /* Trampolines. */ |
| 1300 | tramp_frame_prepend_unwinder (gdbarch, |
| 1301 | &ppc32_linux_sigaction_tramp_frame); |
| 1302 | tramp_frame_prepend_unwinder (gdbarch, |
| 1303 | &ppc32_linux_sighandler_tramp_frame); |
| 1304 | |
| 1305 | /* BFD target for core files. */ |
| 1306 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_LITTLE) |
| 1307 | set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpcle"); |
| 1308 | else |
| 1309 | set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpc"); |
| 1310 | |
| 1311 | if (powerpc_so_ops.in_dynsym_resolve_code == NULL) |
| 1312 | { |
| 1313 | powerpc_so_ops = svr4_so_ops; |
| 1314 | /* Override dynamic resolve function. */ |
| 1315 | powerpc_so_ops.in_dynsym_resolve_code = |
| 1316 | powerpc_linux_in_dynsym_resolve_code; |
| 1317 | } |
| 1318 | set_solib_ops (gdbarch, &powerpc_so_ops); |
| 1319 | |
| 1320 | set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); |
| 1321 | } |
| 1322 | |
| 1323 | if (tdep->wordsize == 8) |
| 1324 | { |
| 1325 | if (tdep->elf_abi == POWERPC_ELF_V1) |
| 1326 | { |
| 1327 | /* Handle PPC GNU/Linux 64-bit function pointers (which are really |
| 1328 | function descriptors). */ |
| 1329 | set_gdbarch_convert_from_func_ptr_addr |
| 1330 | (gdbarch, ppc64_convert_from_func_ptr_addr); |
| 1331 | |
| 1332 | set_gdbarch_elf_make_msymbol_special |
| 1333 | (gdbarch, ppc64_elf_make_msymbol_special); |
| 1334 | } |
| 1335 | else |
| 1336 | { |
| 1337 | set_gdbarch_elf_make_msymbol_special |
| 1338 | (gdbarch, ppc_elfv2_elf_make_msymbol_special); |
| 1339 | |
| 1340 | set_gdbarch_skip_entrypoint (gdbarch, ppc_elfv2_skip_entrypoint); |
| 1341 | } |
| 1342 | |
| 1343 | /* Shared library handling. */ |
| 1344 | set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code); |
| 1345 | set_solib_svr4_fetch_link_map_offsets |
| 1346 | (gdbarch, svr4_lp64_fetch_link_map_offsets); |
| 1347 | |
| 1348 | /* Setting the correct XML syscall filename. */ |
| 1349 | set_xml_syscall_file_name (XML_SYSCALL_FILENAME_PPC64); |
| 1350 | |
| 1351 | /* Trampolines. */ |
| 1352 | tramp_frame_prepend_unwinder (gdbarch, |
| 1353 | &ppc64_linux_sigaction_tramp_frame); |
| 1354 | tramp_frame_prepend_unwinder (gdbarch, |
| 1355 | &ppc64_linux_sighandler_tramp_frame); |
| 1356 | |
| 1357 | /* BFD target for core files. */ |
| 1358 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_LITTLE) |
| 1359 | set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpcle"); |
| 1360 | else |
| 1361 | set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpc"); |
| 1362 | } |
| 1363 | |
| 1364 | /* PPC32 uses a different prpsinfo32 compared to most other Linux |
| 1365 | archs. */ |
| 1366 | if (tdep->wordsize == 4) |
| 1367 | set_gdbarch_elfcore_write_linux_prpsinfo (gdbarch, |
| 1368 | elfcore_write_ppc_linux_prpsinfo32); |
| 1369 | |
| 1370 | set_gdbarch_core_read_description (gdbarch, ppc_linux_core_read_description); |
| 1371 | set_gdbarch_iterate_over_regset_sections (gdbarch, |
| 1372 | ppc_linux_iterate_over_regset_sections); |
| 1373 | |
| 1374 | /* Enable TLS support. */ |
| 1375 | set_gdbarch_fetch_tls_load_module_address (gdbarch, |
| 1376 | svr4_fetch_objfile_link_map); |
| 1377 | |
| 1378 | if (tdesc_data) |
| 1379 | { |
| 1380 | const struct tdesc_feature *feature; |
| 1381 | |
| 1382 | /* If we have target-described registers, then we can safely |
| 1383 | reserve a number for PPC_ORIG_R3_REGNUM and PPC_TRAP_REGNUM |
| 1384 | (whether they are described or not). */ |
| 1385 | gdb_assert (gdbarch_num_regs (gdbarch) <= PPC_ORIG_R3_REGNUM); |
| 1386 | set_gdbarch_num_regs (gdbarch, PPC_TRAP_REGNUM + 1); |
| 1387 | |
| 1388 | /* If they are present, then assign them to the reserved number. */ |
| 1389 | feature = tdesc_find_feature (info.target_desc, |
| 1390 | "org.gnu.gdb.power.linux"); |
| 1391 | if (feature != NULL) |
| 1392 | { |
| 1393 | tdesc_numbered_register (feature, tdesc_data, |
| 1394 | PPC_ORIG_R3_REGNUM, "orig_r3"); |
| 1395 | tdesc_numbered_register (feature, tdesc_data, |
| 1396 | PPC_TRAP_REGNUM, "trap"); |
| 1397 | } |
| 1398 | } |
| 1399 | |
| 1400 | /* Enable Cell/B.E. if supported by the target. */ |
| 1401 | if (tdesc_compatible_p (info.target_desc, |
| 1402 | bfd_lookup_arch (bfd_arch_spu, bfd_mach_spu))) |
| 1403 | { |
| 1404 | /* Cell/B.E. multi-architecture support. */ |
| 1405 | set_spu_solib_ops (gdbarch); |
| 1406 | |
| 1407 | /* Cell/B.E. cross-architecture unwinder support. */ |
| 1408 | frame_unwind_prepend_unwinder (gdbarch, &ppu2spu_unwind); |
| 1409 | |
| 1410 | /* The default displaced_step_at_entry_point doesn't work for |
| 1411 | SPU stand-alone executables. */ |
| 1412 | set_gdbarch_displaced_step_location (gdbarch, |
| 1413 | ppc_linux_displaced_step_location); |
| 1414 | } |
| 1415 | |
| 1416 | set_gdbarch_get_siginfo_type (gdbarch, linux_get_siginfo_type); |
| 1417 | } |
| 1418 | |
| 1419 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 1420 | extern initialize_file_ftype _initialize_ppc_linux_tdep; |
| 1421 | |
| 1422 | void |
| 1423 | _initialize_ppc_linux_tdep (void) |
| 1424 | { |
| 1425 | /* Register for all sub-familes of the POWER/PowerPC: 32-bit and |
| 1426 | 64-bit PowerPC, and the older rs6k. */ |
| 1427 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_LINUX, |
| 1428 | ppc_linux_init_abi); |
| 1429 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64, GDB_OSABI_LINUX, |
| 1430 | ppc_linux_init_abi); |
| 1431 | gdbarch_register_osabi (bfd_arch_rs6000, bfd_mach_rs6k, GDB_OSABI_LINUX, |
| 1432 | ppc_linux_init_abi); |
| 1433 | |
| 1434 | /* Attach to inferior_created observer. */ |
| 1435 | observer_attach_inferior_created (ppc_linux_inferior_created); |
| 1436 | |
| 1437 | /* Attach to observers to track __spe_current_active_context. */ |
| 1438 | observer_attach_inferior_created (ppc_linux_spe_context_inferior_created); |
| 1439 | observer_attach_solib_loaded (ppc_linux_spe_context_solib_loaded); |
| 1440 | observer_attach_solib_unloaded (ppc_linux_spe_context_solib_unloaded); |
| 1441 | |
| 1442 | /* Initialize the Linux target descriptions. */ |
| 1443 | initialize_tdesc_powerpc_32l (); |
| 1444 | initialize_tdesc_powerpc_altivec32l (); |
| 1445 | initialize_tdesc_powerpc_cell32l (); |
| 1446 | initialize_tdesc_powerpc_vsx32l (); |
| 1447 | initialize_tdesc_powerpc_isa205_32l (); |
| 1448 | initialize_tdesc_powerpc_isa205_altivec32l (); |
| 1449 | initialize_tdesc_powerpc_isa205_vsx32l (); |
| 1450 | initialize_tdesc_powerpc_64l (); |
| 1451 | initialize_tdesc_powerpc_altivec64l (); |
| 1452 | initialize_tdesc_powerpc_cell64l (); |
| 1453 | initialize_tdesc_powerpc_vsx64l (); |
| 1454 | initialize_tdesc_powerpc_isa205_64l (); |
| 1455 | initialize_tdesc_powerpc_isa205_altivec64l (); |
| 1456 | initialize_tdesc_powerpc_isa205_vsx64l (); |
| 1457 | initialize_tdesc_powerpc_e500l (); |
| 1458 | } |