| 1 | /* Target-dependent code for GNU/Linux running on PA-RISC, for GDB. |
| 2 | |
| 3 | Copyright (C) 2004, 2006, 2007 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 2 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, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 20 | Boston, MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "gdbcore.h" |
| 24 | #include "osabi.h" |
| 25 | #include "target.h" |
| 26 | #include "objfiles.h" |
| 27 | #include "solib-svr4.h" |
| 28 | #include "glibc-tdep.h" |
| 29 | #include "frame-unwind.h" |
| 30 | #include "trad-frame.h" |
| 31 | #include "dwarf2-frame.h" |
| 32 | #include "value.h" |
| 33 | #include "regset.h" |
| 34 | #include "regcache.h" |
| 35 | #include "hppa-tdep.h" |
| 36 | |
| 37 | #include "elf/common.h" |
| 38 | |
| 39 | #if 0 |
| 40 | /* Convert DWARF register number REG to the appropriate register |
| 41 | number used by GDB. */ |
| 42 | static int |
| 43 | hppa_dwarf_reg_to_regnum (int reg) |
| 44 | { |
| 45 | /* registers 0 - 31 are the same in both sets */ |
| 46 | if (reg < 32) |
| 47 | return reg; |
| 48 | |
| 49 | /* dwarf regs 32 to 85 are fpregs 4 - 31 */ |
| 50 | if (reg >= 32 && reg <= 85) |
| 51 | return HPPA_FP4_REGNUM + (reg - 32); |
| 52 | |
| 53 | warning (_("Unmapped DWARF Register #%d encountered."), reg); |
| 54 | return -1; |
| 55 | } |
| 56 | #endif |
| 57 | |
| 58 | static void |
| 59 | hppa_linux_target_write_pc (struct regcache *regcache, CORE_ADDR v) |
| 60 | { |
| 61 | /* Probably this should be done by the kernel, but it isn't. */ |
| 62 | regcache_cooked_write_unsigned (regcache, HPPA_PCOQ_HEAD_REGNUM, v | 0x3); |
| 63 | regcache_cooked_write_unsigned (regcache, HPPA_PCOQ_TAIL_REGNUM, (v + 4) | 0x3); |
| 64 | } |
| 65 | |
| 66 | /* An instruction to match. */ |
| 67 | struct insn_pattern |
| 68 | { |
| 69 | unsigned int data; /* See if it matches this.... */ |
| 70 | unsigned int mask; /* ... with this mask. */ |
| 71 | }; |
| 72 | |
| 73 | static struct insn_pattern hppa_sigtramp[] = { |
| 74 | /* ldi 0, %r25 or ldi 1, %r25 */ |
| 75 | { 0x34190000, 0xfffffffd }, |
| 76 | /* ldi __NR_rt_sigreturn, %r20 */ |
| 77 | { 0x3414015a, 0xffffffff }, |
| 78 | /* be,l 0x100(%sr2, %r0), %sr0, %r31 */ |
| 79 | { 0xe4008200, 0xffffffff }, |
| 80 | /* nop */ |
| 81 | { 0x08000240, 0xffffffff }, |
| 82 | { 0, 0 } |
| 83 | }; |
| 84 | |
| 85 | #define HPPA_MAX_INSN_PATTERN_LEN (4) |
| 86 | |
| 87 | /* Return non-zero if the instructions at PC match the series |
| 88 | described in PATTERN, or zero otherwise. PATTERN is an array of |
| 89 | 'struct insn_pattern' objects, terminated by an entry whose mask is |
| 90 | zero. |
| 91 | |
| 92 | When the match is successful, fill INSN[i] with what PATTERN[i] |
| 93 | matched. */ |
| 94 | static int |
| 95 | insns_match_pattern (CORE_ADDR pc, |
| 96 | struct insn_pattern *pattern, |
| 97 | unsigned int *insn) |
| 98 | { |
| 99 | int i; |
| 100 | CORE_ADDR npc = pc; |
| 101 | |
| 102 | for (i = 0; pattern[i].mask; i++) |
| 103 | { |
| 104 | char buf[4]; |
| 105 | |
| 106 | read_memory_nobpt (npc, buf, 4); |
| 107 | insn[i] = extract_unsigned_integer (buf, 4); |
| 108 | if ((insn[i] & pattern[i].mask) == pattern[i].data) |
| 109 | npc += 4; |
| 110 | else |
| 111 | return 0; |
| 112 | } |
| 113 | return 1; |
| 114 | } |
| 115 | |
| 116 | /* Signal frames. */ |
| 117 | |
| 118 | /* (This is derived from MD_FALLBACK_FRAME_STATE_FOR in gcc.) |
| 119 | |
| 120 | Unfortunately, because of various bugs and changes to the kernel, |
| 121 | we have several cases to deal with. |
| 122 | |
| 123 | In 2.4, the signal trampoline is 4 bytes, and pc should point directly at |
| 124 | the beginning of the trampoline and struct rt_sigframe. |
| 125 | |
| 126 | In <= 2.6.5-rc2-pa3, the signal trampoline is 9 bytes, and pc points at |
| 127 | the 4th word in the trampoline structure. This is wrong, it should point |
| 128 | at the 5th word. This is fixed in 2.6.5-rc2-pa4. |
| 129 | |
| 130 | To detect these cases, we first take pc, align it to 64-bytes |
| 131 | to get the beginning of the signal frame, and then check offsets 0, 4 |
| 132 | and 5 to see if we found the beginning of the trampoline. This will |
| 133 | tell us how to locate the sigcontext structure. |
| 134 | |
| 135 | Note that with a 2.4 64-bit kernel, the signal context is not properly |
| 136 | passed back to userspace so the unwind will not work correctly. */ |
| 137 | static CORE_ADDR |
| 138 | hppa_linux_sigtramp_find_sigcontext (CORE_ADDR pc) |
| 139 | { |
| 140 | unsigned int dummy[HPPA_MAX_INSN_PATTERN_LEN]; |
| 141 | int offs = 0; |
| 142 | int try; |
| 143 | /* offsets to try to find the trampoline */ |
| 144 | static int pcoffs[] = { 0, 4*4, 5*4 }; |
| 145 | /* offsets to the rt_sigframe structure */ |
| 146 | static int sfoffs[] = { 4*4, 10*4, 10*4 }; |
| 147 | CORE_ADDR sp; |
| 148 | |
| 149 | /* Most of the time, this will be correct. The one case when this will |
| 150 | fail is if the user defined an alternate stack, in which case the |
| 151 | beginning of the stack will not be align_down (pc, 64). */ |
| 152 | sp = align_down (pc, 64); |
| 153 | |
| 154 | /* rt_sigreturn trampoline: |
| 155 | 3419000x ldi 0, %r25 or ldi 1, %r25 (x = 0 or 2) |
| 156 | 3414015a ldi __NR_rt_sigreturn, %r20 |
| 157 | e4008200 be,l 0x100(%sr2, %r0), %sr0, %r31 |
| 158 | 08000240 nop */ |
| 159 | |
| 160 | for (try = 0; try < ARRAY_SIZE (pcoffs); try++) |
| 161 | { |
| 162 | if (insns_match_pattern (sp + pcoffs[try], hppa_sigtramp, dummy)) |
| 163 | { |
| 164 | offs = sfoffs[try]; |
| 165 | break; |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | if (offs == 0) |
| 170 | { |
| 171 | if (insns_match_pattern (pc, hppa_sigtramp, dummy)) |
| 172 | { |
| 173 | /* sigaltstack case: we have no way of knowing which offset to |
| 174 | use in this case; default to new kernel handling. If this is |
| 175 | wrong the unwinding will fail. */ |
| 176 | try = 2; |
| 177 | sp = pc - pcoffs[try]; |
| 178 | } |
| 179 | else |
| 180 | { |
| 181 | return 0; |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | /* sp + sfoffs[try] points to a struct rt_sigframe, which contains |
| 186 | a struct siginfo and a struct ucontext. struct ucontext contains |
| 187 | a struct sigcontext. Return an offset to this sigcontext here. Too |
| 188 | bad we cannot include system specific headers :-(. |
| 189 | sizeof(struct siginfo) == 128 |
| 190 | offsetof(struct ucontext, uc_mcontext) == 24. */ |
| 191 | return sp + sfoffs[try] + 128 + 24; |
| 192 | } |
| 193 | |
| 194 | struct hppa_linux_sigtramp_unwind_cache |
| 195 | { |
| 196 | CORE_ADDR base; |
| 197 | struct trad_frame_saved_reg *saved_regs; |
| 198 | }; |
| 199 | |
| 200 | static struct hppa_linux_sigtramp_unwind_cache * |
| 201 | hppa_linux_sigtramp_frame_unwind_cache (struct frame_info *next_frame, |
| 202 | void **this_cache) |
| 203 | { |
| 204 | struct gdbarch *gdbarch = get_frame_arch (next_frame); |
| 205 | struct hppa_linux_sigtramp_unwind_cache *info; |
| 206 | CORE_ADDR pc, scptr; |
| 207 | int i; |
| 208 | |
| 209 | if (*this_cache) |
| 210 | return *this_cache; |
| 211 | |
| 212 | info = FRAME_OBSTACK_ZALLOC (struct hppa_linux_sigtramp_unwind_cache); |
| 213 | *this_cache = info; |
| 214 | info->saved_regs = trad_frame_alloc_saved_regs (next_frame); |
| 215 | |
| 216 | pc = frame_pc_unwind (next_frame); |
| 217 | scptr = hppa_linux_sigtramp_find_sigcontext (pc); |
| 218 | |
| 219 | /* structure of struct sigcontext: |
| 220 | |
| 221 | struct sigcontext { |
| 222 | unsigned long sc_flags; |
| 223 | unsigned long sc_gr[32]; |
| 224 | unsigned long long sc_fr[32]; |
| 225 | unsigned long sc_iasq[2]; |
| 226 | unsigned long sc_iaoq[2]; |
| 227 | unsigned long sc_sar; */ |
| 228 | |
| 229 | /* Skip sc_flags. */ |
| 230 | scptr += 4; |
| 231 | |
| 232 | /* GR[0] is the psw, we don't restore that. */ |
| 233 | scptr += 4; |
| 234 | |
| 235 | /* General registers. */ |
| 236 | for (i = 1; i < 32; i++) |
| 237 | { |
| 238 | info->saved_regs[HPPA_R0_REGNUM + i].addr = scptr; |
| 239 | scptr += 4; |
| 240 | } |
| 241 | |
| 242 | /* Pad. */ |
| 243 | scptr += 4; |
| 244 | |
| 245 | /* FP regs; FP0-3 are not restored. */ |
| 246 | scptr += (8 * 4); |
| 247 | |
| 248 | for (i = 4; i < 32; i++) |
| 249 | { |
| 250 | info->saved_regs[HPPA_FP0_REGNUM + (i * 2)].addr = scptr; |
| 251 | scptr += 4; |
| 252 | info->saved_regs[HPPA_FP0_REGNUM + (i * 2) + 1].addr = scptr; |
| 253 | scptr += 4; |
| 254 | } |
| 255 | |
| 256 | /* IASQ/IAOQ. */ |
| 257 | info->saved_regs[HPPA_PCSQ_HEAD_REGNUM].addr = scptr; |
| 258 | scptr += 4; |
| 259 | info->saved_regs[HPPA_PCSQ_TAIL_REGNUM].addr = scptr; |
| 260 | scptr += 4; |
| 261 | |
| 262 | info->saved_regs[HPPA_PCOQ_HEAD_REGNUM].addr = scptr; |
| 263 | scptr += 4; |
| 264 | info->saved_regs[HPPA_PCOQ_TAIL_REGNUM].addr = scptr; |
| 265 | scptr += 4; |
| 266 | |
| 267 | info->base = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM); |
| 268 | |
| 269 | return info; |
| 270 | } |
| 271 | |
| 272 | static void |
| 273 | hppa_linux_sigtramp_frame_this_id (struct frame_info *next_frame, |
| 274 | void **this_prologue_cache, |
| 275 | struct frame_id *this_id) |
| 276 | { |
| 277 | struct hppa_linux_sigtramp_unwind_cache *info |
| 278 | = hppa_linux_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache); |
| 279 | *this_id = frame_id_build (info->base, frame_pc_unwind (next_frame)); |
| 280 | } |
| 281 | |
| 282 | static void |
| 283 | hppa_linux_sigtramp_frame_prev_register (struct frame_info *next_frame, |
| 284 | void **this_prologue_cache, |
| 285 | int regnum, int *optimizedp, |
| 286 | enum lval_type *lvalp, |
| 287 | CORE_ADDR *addrp, |
| 288 | int *realnump, gdb_byte *valuep) |
| 289 | { |
| 290 | struct hppa_linux_sigtramp_unwind_cache *info |
| 291 | = hppa_linux_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache); |
| 292 | hppa_frame_prev_register_helper (next_frame, info->saved_regs, regnum, |
| 293 | optimizedp, lvalp, addrp, realnump, valuep); |
| 294 | } |
| 295 | |
| 296 | static const struct frame_unwind hppa_linux_sigtramp_frame_unwind = { |
| 297 | SIGTRAMP_FRAME, |
| 298 | hppa_linux_sigtramp_frame_this_id, |
| 299 | hppa_linux_sigtramp_frame_prev_register |
| 300 | }; |
| 301 | |
| 302 | /* hppa-linux always uses "new-style" rt-signals. The signal handler's return |
| 303 | address should point to a signal trampoline on the stack. The signal |
| 304 | trampoline is embedded in a rt_sigframe structure that is aligned on |
| 305 | the stack. We take advantage of the fact that sp must be 64-byte aligned, |
| 306 | and the trampoline is small, so by rounding down the trampoline address |
| 307 | we can find the beginning of the struct rt_sigframe. */ |
| 308 | static const struct frame_unwind * |
| 309 | hppa_linux_sigtramp_unwind_sniffer (struct frame_info *next_frame) |
| 310 | { |
| 311 | CORE_ADDR pc = frame_pc_unwind (next_frame); |
| 312 | |
| 313 | if (hppa_linux_sigtramp_find_sigcontext (pc)) |
| 314 | return &hppa_linux_sigtramp_frame_unwind; |
| 315 | |
| 316 | return NULL; |
| 317 | } |
| 318 | |
| 319 | /* Attempt to find (and return) the global pointer for the given |
| 320 | function. |
| 321 | |
| 322 | This is a rather nasty bit of code searchs for the .dynamic section |
| 323 | in the objfile corresponding to the pc of the function we're trying |
| 324 | to call. Once it finds the addresses at which the .dynamic section |
| 325 | lives in the child process, it scans the Elf32_Dyn entries for a |
| 326 | DT_PLTGOT tag. If it finds one of these, the corresponding |
| 327 | d_un.d_ptr value is the global pointer. */ |
| 328 | |
| 329 | static CORE_ADDR |
| 330 | hppa_linux_find_global_pointer (struct value *function) |
| 331 | { |
| 332 | struct obj_section *faddr_sect; |
| 333 | CORE_ADDR faddr; |
| 334 | |
| 335 | faddr = value_as_address (function); |
| 336 | |
| 337 | /* Is this a plabel? If so, dereference it to get the gp value. */ |
| 338 | if (faddr & 2) |
| 339 | { |
| 340 | int status; |
| 341 | char buf[4]; |
| 342 | |
| 343 | faddr &= ~3; |
| 344 | |
| 345 | status = target_read_memory (faddr + 4, buf, sizeof (buf)); |
| 346 | if (status == 0) |
| 347 | return extract_unsigned_integer (buf, sizeof (buf)); |
| 348 | } |
| 349 | |
| 350 | /* If the address is in the plt section, then the real function hasn't |
| 351 | yet been fixed up by the linker so we cannot determine the gp of |
| 352 | that function. */ |
| 353 | if (in_plt_section (faddr, NULL)) |
| 354 | return 0; |
| 355 | |
| 356 | faddr_sect = find_pc_section (faddr); |
| 357 | if (faddr_sect != NULL) |
| 358 | { |
| 359 | struct obj_section *osect; |
| 360 | |
| 361 | ALL_OBJFILE_OSECTIONS (faddr_sect->objfile, osect) |
| 362 | { |
| 363 | if (strcmp (osect->the_bfd_section->name, ".dynamic") == 0) |
| 364 | break; |
| 365 | } |
| 366 | |
| 367 | if (osect < faddr_sect->objfile->sections_end) |
| 368 | { |
| 369 | CORE_ADDR addr; |
| 370 | |
| 371 | addr = osect->addr; |
| 372 | while (addr < osect->endaddr) |
| 373 | { |
| 374 | int status; |
| 375 | LONGEST tag; |
| 376 | char buf[4]; |
| 377 | |
| 378 | status = target_read_memory (addr, buf, sizeof (buf)); |
| 379 | if (status != 0) |
| 380 | break; |
| 381 | tag = extract_signed_integer (buf, sizeof (buf)); |
| 382 | |
| 383 | if (tag == DT_PLTGOT) |
| 384 | { |
| 385 | CORE_ADDR global_pointer; |
| 386 | |
| 387 | status = target_read_memory (addr + 4, buf, sizeof (buf)); |
| 388 | if (status != 0) |
| 389 | break; |
| 390 | global_pointer = extract_unsigned_integer (buf, sizeof (buf)); |
| 391 | |
| 392 | /* The payoff... */ |
| 393 | return global_pointer; |
| 394 | } |
| 395 | |
| 396 | if (tag == DT_NULL) |
| 397 | break; |
| 398 | |
| 399 | addr += 8; |
| 400 | } |
| 401 | } |
| 402 | } |
| 403 | return 0; |
| 404 | } |
| 405 | \f |
| 406 | /* |
| 407 | * Registers saved in a coredump: |
| 408 | * gr0..gr31 |
| 409 | * sr0..sr7 |
| 410 | * iaoq0..iaoq1 |
| 411 | * iasq0..iasq1 |
| 412 | * sar, iir, isr, ior, ipsw |
| 413 | * cr0, cr24..cr31 |
| 414 | * cr8,9,12,13 |
| 415 | * cr10, cr15 |
| 416 | */ |
| 417 | |
| 418 | #define GR_REGNUM(_n) (HPPA_R0_REGNUM+_n) |
| 419 | #define TR_REGNUM(_n) (HPPA_TR0_REGNUM+_n) |
| 420 | static const int greg_map[] = |
| 421 | { |
| 422 | GR_REGNUM(0), GR_REGNUM(1), GR_REGNUM(2), GR_REGNUM(3), |
| 423 | GR_REGNUM(4), GR_REGNUM(5), GR_REGNUM(6), GR_REGNUM(7), |
| 424 | GR_REGNUM(8), GR_REGNUM(9), GR_REGNUM(10), GR_REGNUM(11), |
| 425 | GR_REGNUM(12), GR_REGNUM(13), GR_REGNUM(14), GR_REGNUM(15), |
| 426 | GR_REGNUM(16), GR_REGNUM(17), GR_REGNUM(18), GR_REGNUM(19), |
| 427 | GR_REGNUM(20), GR_REGNUM(21), GR_REGNUM(22), GR_REGNUM(23), |
| 428 | GR_REGNUM(24), GR_REGNUM(25), GR_REGNUM(26), GR_REGNUM(27), |
| 429 | GR_REGNUM(28), GR_REGNUM(29), GR_REGNUM(30), GR_REGNUM(31), |
| 430 | |
| 431 | HPPA_SR4_REGNUM+1, HPPA_SR4_REGNUM+2, HPPA_SR4_REGNUM+3, HPPA_SR4_REGNUM+4, |
| 432 | HPPA_SR4_REGNUM, HPPA_SR4_REGNUM+5, HPPA_SR4_REGNUM+6, HPPA_SR4_REGNUM+7, |
| 433 | |
| 434 | HPPA_PCOQ_HEAD_REGNUM, HPPA_PCOQ_TAIL_REGNUM, |
| 435 | HPPA_PCSQ_HEAD_REGNUM, HPPA_PCSQ_TAIL_REGNUM, |
| 436 | |
| 437 | HPPA_SAR_REGNUM, HPPA_IIR_REGNUM, HPPA_ISR_REGNUM, HPPA_IOR_REGNUM, |
| 438 | HPPA_IPSW_REGNUM, HPPA_RCR_REGNUM, |
| 439 | |
| 440 | TR_REGNUM(0), TR_REGNUM(1), TR_REGNUM(2), TR_REGNUM(3), |
| 441 | TR_REGNUM(4), TR_REGNUM(5), TR_REGNUM(6), TR_REGNUM(7), |
| 442 | |
| 443 | HPPA_PID0_REGNUM, HPPA_PID1_REGNUM, HPPA_PID2_REGNUM, HPPA_PID3_REGNUM, |
| 444 | HPPA_CCR_REGNUM, HPPA_EIEM_REGNUM, |
| 445 | }; |
| 446 | |
| 447 | static void |
| 448 | hppa_linux_supply_regset (const struct regset *regset, |
| 449 | struct regcache *regcache, |
| 450 | int regnum, const void *regs, size_t len) |
| 451 | { |
| 452 | struct gdbarch *arch = get_regcache_arch (regcache); |
| 453 | struct gdbarch_tdep *tdep = gdbarch_tdep (arch); |
| 454 | const char *buf = regs; |
| 455 | int i, offset; |
| 456 | |
| 457 | offset = 0; |
| 458 | for (i = 0; i < ARRAY_SIZE (greg_map); i++) |
| 459 | { |
| 460 | if (regnum == greg_map[i] || regnum == -1) |
| 461 | regcache_raw_supply (regcache, greg_map[i], buf + offset); |
| 462 | |
| 463 | offset += tdep->bytes_per_address; |
| 464 | } |
| 465 | } |
| 466 | |
| 467 | static void |
| 468 | hppa_linux_supply_fpregset (const struct regset *regset, |
| 469 | struct regcache *regcache, |
| 470 | int regnum, const void *regs, size_t len) |
| 471 | { |
| 472 | const char *buf = regs; |
| 473 | int i, offset; |
| 474 | |
| 475 | offset = 0; |
| 476 | for (i = 0; i < 31; i++) |
| 477 | { |
| 478 | if (regnum == HPPA_FP0_REGNUM + i || regnum == -1) |
| 479 | regcache_raw_supply (regcache, HPPA_FP0_REGNUM + i, |
| 480 | buf + offset); |
| 481 | offset += 8; |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | /* HPPA Linux kernel register set. */ |
| 486 | static struct regset hppa_linux_regset = |
| 487 | { |
| 488 | NULL, |
| 489 | hppa_linux_supply_regset |
| 490 | }; |
| 491 | |
| 492 | static struct regset hppa_linux_fpregset = |
| 493 | { |
| 494 | NULL, |
| 495 | hppa_linux_supply_fpregset |
| 496 | }; |
| 497 | |
| 498 | static const struct regset * |
| 499 | hppa_linux_regset_from_core_section (struct gdbarch *gdbarch, |
| 500 | const char *sect_name, |
| 501 | size_t sect_size) |
| 502 | { |
| 503 | if (strcmp (sect_name, ".reg") == 0) |
| 504 | return &hppa_linux_regset; |
| 505 | else if (strcmp (sect_name, ".reg2") == 0) |
| 506 | return &hppa_linux_fpregset; |
| 507 | |
| 508 | return NULL; |
| 509 | } |
| 510 | \f |
| 511 | |
| 512 | /* Forward declarations. */ |
| 513 | extern initialize_file_ftype _initialize_hppa_linux_tdep; |
| 514 | |
| 515 | static void |
| 516 | hppa_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 517 | { |
| 518 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 519 | |
| 520 | /* GNU/Linux is always ELF. */ |
| 521 | tdep->is_elf = 1; |
| 522 | |
| 523 | tdep->find_global_pointer = hppa_linux_find_global_pointer; |
| 524 | |
| 525 | set_gdbarch_write_pc (gdbarch, hppa_linux_target_write_pc); |
| 526 | |
| 527 | frame_unwind_append_sniffer (gdbarch, hppa_linux_sigtramp_unwind_sniffer); |
| 528 | |
| 529 | /* GNU/Linux uses SVR4-style shared libraries. */ |
| 530 | set_solib_svr4_fetch_link_map_offsets |
| 531 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| 532 | |
| 533 | tdep->in_solib_call_trampoline = hppa_in_solib_call_trampoline; |
| 534 | set_gdbarch_skip_trampoline_code (gdbarch, hppa_skip_trampoline_code); |
| 535 | |
| 536 | /* GNU/Linux uses the dynamic linker included in the GNU C Library. */ |
| 537 | set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); |
| 538 | |
| 539 | /* On hppa-linux, currently, sizeof(long double) == 8. There has been |
| 540 | some discussions to support 128-bit long double, but it requires some |
| 541 | more work in gcc and glibc first. */ |
| 542 | set_gdbarch_long_double_bit (gdbarch, 64); |
| 543 | |
| 544 | set_gdbarch_regset_from_core_section |
| 545 | (gdbarch, hppa_linux_regset_from_core_section); |
| 546 | |
| 547 | #if 0 |
| 548 | /* Dwarf-2 unwinding support. Not yet working. */ |
| 549 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, hppa_dwarf_reg_to_regnum); |
| 550 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, hppa_dwarf_reg_to_regnum); |
| 551 | frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); |
| 552 | frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer); |
| 553 | #endif |
| 554 | |
| 555 | /* Enable TLS support. */ |
| 556 | set_gdbarch_fetch_tls_load_module_address (gdbarch, |
| 557 | svr4_fetch_objfile_link_map); |
| 558 | } |
| 559 | |
| 560 | void |
| 561 | _initialize_hppa_linux_tdep (void) |
| 562 | { |
| 563 | gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_LINUX, hppa_linux_init_abi); |
| 564 | gdbarch_register_osabi (bfd_arch_hppa, bfd_mach_hppa20w, GDB_OSABI_LINUX, hppa_linux_init_abi); |
| 565 | } |