| 1 | /* Target-dependent code for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997, |
| 4 | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
| 5 | Free Software Foundation, Inc. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "frame.h" |
| 24 | #include "inferior.h" |
| 25 | #include "symtab.h" |
| 26 | #include "target.h" |
| 27 | #include "gdbcore.h" |
| 28 | #include "gdbcmd.h" |
| 29 | #include "objfiles.h" |
| 30 | #include "arch-utils.h" |
| 31 | #include "regcache.h" |
| 32 | #include "regset.h" |
| 33 | #include "doublest.h" |
| 34 | #include "value.h" |
| 35 | #include "parser-defs.h" |
| 36 | #include "osabi.h" |
| 37 | #include "infcall.h" |
| 38 | #include "sim-regno.h" |
| 39 | #include "gdb/sim-ppc.h" |
| 40 | #include "reggroups.h" |
| 41 | #include "dwarf2-frame.h" |
| 42 | #include "target-descriptions.h" |
| 43 | #include "user-regs.h" |
| 44 | |
| 45 | #include "libbfd.h" /* for bfd_default_set_arch_mach */ |
| 46 | #include "coff/internal.h" /* for libcoff.h */ |
| 47 | #include "libcoff.h" /* for xcoff_data */ |
| 48 | #include "coff/xcoff.h" |
| 49 | #include "libxcoff.h" |
| 50 | |
| 51 | #include "elf-bfd.h" |
| 52 | #include "elf/ppc.h" |
| 53 | |
| 54 | #include "solib-svr4.h" |
| 55 | #include "ppc-tdep.h" |
| 56 | |
| 57 | #include "gdb_assert.h" |
| 58 | #include "dis-asm.h" |
| 59 | |
| 60 | #include "trad-frame.h" |
| 61 | #include "frame-unwind.h" |
| 62 | #include "frame-base.h" |
| 63 | |
| 64 | #include "features/rs6000/powerpc-32.c" |
| 65 | #include "features/rs6000/powerpc-altivec32.c" |
| 66 | #include "features/rs6000/powerpc-vsx32.c" |
| 67 | #include "features/rs6000/powerpc-403.c" |
| 68 | #include "features/rs6000/powerpc-403gc.c" |
| 69 | #include "features/rs6000/powerpc-505.c" |
| 70 | #include "features/rs6000/powerpc-601.c" |
| 71 | #include "features/rs6000/powerpc-602.c" |
| 72 | #include "features/rs6000/powerpc-603.c" |
| 73 | #include "features/rs6000/powerpc-604.c" |
| 74 | #include "features/rs6000/powerpc-64.c" |
| 75 | #include "features/rs6000/powerpc-altivec64.c" |
| 76 | #include "features/rs6000/powerpc-vsx64.c" |
| 77 | #include "features/rs6000/powerpc-7400.c" |
| 78 | #include "features/rs6000/powerpc-750.c" |
| 79 | #include "features/rs6000/powerpc-860.c" |
| 80 | #include "features/rs6000/powerpc-e500.c" |
| 81 | #include "features/rs6000/rs6000.c" |
| 82 | |
| 83 | /* Determine if regnum is an SPE pseudo-register. */ |
| 84 | #define IS_SPE_PSEUDOREG(tdep, regnum) ((tdep)->ppc_ev0_regnum >= 0 \ |
| 85 | && (regnum) >= (tdep)->ppc_ev0_regnum \ |
| 86 | && (regnum) < (tdep)->ppc_ev0_regnum + 32) |
| 87 | |
| 88 | /* Determine if regnum is a decimal float pseudo-register. */ |
| 89 | #define IS_DFP_PSEUDOREG(tdep, regnum) ((tdep)->ppc_dl0_regnum >= 0 \ |
| 90 | && (regnum) >= (tdep)->ppc_dl0_regnum \ |
| 91 | && (regnum) < (tdep)->ppc_dl0_regnum + 16) |
| 92 | |
| 93 | /* Determine if regnum is a POWER7 VSX register. */ |
| 94 | #define IS_VSX_PSEUDOREG(tdep, regnum) ((tdep)->ppc_vsr0_regnum >= 0 \ |
| 95 | && (regnum) >= (tdep)->ppc_vsr0_regnum \ |
| 96 | && (regnum) < (tdep)->ppc_vsr0_regnum + ppc_num_vsrs) |
| 97 | |
| 98 | /* Determine if regnum is a POWER7 Extended FP register. */ |
| 99 | #define IS_EFP_PSEUDOREG(tdep, regnum) ((tdep)->ppc_efpr0_regnum >= 0 \ |
| 100 | && (regnum) >= (tdep)->ppc_efpr0_regnum \ |
| 101 | && (regnum) < (tdep)->ppc_efpr0_regnum + ppc_num_fprs) |
| 102 | |
| 103 | /* The list of available "set powerpc ..." and "show powerpc ..." |
| 104 | commands. */ |
| 105 | static struct cmd_list_element *setpowerpccmdlist = NULL; |
| 106 | static struct cmd_list_element *showpowerpccmdlist = NULL; |
| 107 | |
| 108 | static enum auto_boolean powerpc_soft_float_global = AUTO_BOOLEAN_AUTO; |
| 109 | |
| 110 | /* The vector ABI to use. Keep this in sync with powerpc_vector_abi. */ |
| 111 | static const char *powerpc_vector_strings[] = |
| 112 | { |
| 113 | "auto", |
| 114 | "generic", |
| 115 | "altivec", |
| 116 | "spe", |
| 117 | NULL |
| 118 | }; |
| 119 | |
| 120 | /* A variable that can be configured by the user. */ |
| 121 | static enum powerpc_vector_abi powerpc_vector_abi_global = POWERPC_VEC_AUTO; |
| 122 | static const char *powerpc_vector_abi_string = "auto"; |
| 123 | |
| 124 | /* To be used by skip_prologue. */ |
| 125 | |
| 126 | struct rs6000_framedata |
| 127 | { |
| 128 | int offset; /* total size of frame --- the distance |
| 129 | by which we decrement sp to allocate |
| 130 | the frame */ |
| 131 | int saved_gpr; /* smallest # of saved gpr */ |
| 132 | unsigned int gpr_mask; /* Each bit is an individual saved GPR. */ |
| 133 | int saved_fpr; /* smallest # of saved fpr */ |
| 134 | int saved_vr; /* smallest # of saved vr */ |
| 135 | int saved_ev; /* smallest # of saved ev */ |
| 136 | int alloca_reg; /* alloca register number (frame ptr) */ |
| 137 | char frameless; /* true if frameless functions. */ |
| 138 | char nosavedpc; /* true if pc not saved. */ |
| 139 | char used_bl; /* true if link register clobbered */ |
| 140 | int gpr_offset; /* offset of saved gprs from prev sp */ |
| 141 | int fpr_offset; /* offset of saved fprs from prev sp */ |
| 142 | int vr_offset; /* offset of saved vrs from prev sp */ |
| 143 | int ev_offset; /* offset of saved evs from prev sp */ |
| 144 | int lr_offset; /* offset of saved lr */ |
| 145 | int lr_register; /* register of saved lr, if trustworthy */ |
| 146 | int cr_offset; /* offset of saved cr */ |
| 147 | int vrsave_offset; /* offset of saved vrsave register */ |
| 148 | }; |
| 149 | |
| 150 | |
| 151 | /* Is REGNO a VSX register? Return 1 if so, 0 otherwise. */ |
| 152 | int |
| 153 | vsx_register_p (struct gdbarch *gdbarch, int regno) |
| 154 | { |
| 155 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 156 | if (tdep->ppc_vsr0_regnum < 0) |
| 157 | return 0; |
| 158 | else |
| 159 | return (regno >= tdep->ppc_vsr0_upper_regnum && regno |
| 160 | <= tdep->ppc_vsr0_upper_regnum + 31); |
| 161 | } |
| 162 | |
| 163 | /* Is REGNO an AltiVec register? Return 1 if so, 0 otherwise. */ |
| 164 | int |
| 165 | altivec_register_p (struct gdbarch *gdbarch, int regno) |
| 166 | { |
| 167 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 168 | if (tdep->ppc_vr0_regnum < 0 || tdep->ppc_vrsave_regnum < 0) |
| 169 | return 0; |
| 170 | else |
| 171 | return (regno >= tdep->ppc_vr0_regnum && regno <= tdep->ppc_vrsave_regnum); |
| 172 | } |
| 173 | |
| 174 | |
| 175 | /* Return true if REGNO is an SPE register, false otherwise. */ |
| 176 | int |
| 177 | spe_register_p (struct gdbarch *gdbarch, int regno) |
| 178 | { |
| 179 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 180 | |
| 181 | /* Is it a reference to EV0 -- EV31, and do we have those? */ |
| 182 | if (IS_SPE_PSEUDOREG (tdep, regno)) |
| 183 | return 1; |
| 184 | |
| 185 | /* Is it a reference to one of the raw upper GPR halves? */ |
| 186 | if (tdep->ppc_ev0_upper_regnum >= 0 |
| 187 | && tdep->ppc_ev0_upper_regnum <= regno |
| 188 | && regno < tdep->ppc_ev0_upper_regnum + ppc_num_gprs) |
| 189 | return 1; |
| 190 | |
| 191 | /* Is it a reference to the 64-bit accumulator, and do we have that? */ |
| 192 | if (tdep->ppc_acc_regnum >= 0 |
| 193 | && tdep->ppc_acc_regnum == regno) |
| 194 | return 1; |
| 195 | |
| 196 | /* Is it a reference to the SPE floating-point status and control register, |
| 197 | and do we have that? */ |
| 198 | if (tdep->ppc_spefscr_regnum >= 0 |
| 199 | && tdep->ppc_spefscr_regnum == regno) |
| 200 | return 1; |
| 201 | |
| 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | |
| 206 | /* Return non-zero if the architecture described by GDBARCH has |
| 207 | floating-point registers (f0 --- f31 and fpscr). */ |
| 208 | int |
| 209 | ppc_floating_point_unit_p (struct gdbarch *gdbarch) |
| 210 | { |
| 211 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 212 | |
| 213 | return (tdep->ppc_fp0_regnum >= 0 |
| 214 | && tdep->ppc_fpscr_regnum >= 0); |
| 215 | } |
| 216 | |
| 217 | /* Return non-zero if the architecture described by GDBARCH has |
| 218 | VSX registers (vsr0 --- vsr63). */ |
| 219 | static int |
| 220 | ppc_vsx_support_p (struct gdbarch *gdbarch) |
| 221 | { |
| 222 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 223 | |
| 224 | return tdep->ppc_vsr0_regnum >= 0; |
| 225 | } |
| 226 | |
| 227 | /* Return non-zero if the architecture described by GDBARCH has |
| 228 | Altivec registers (vr0 --- vr31, vrsave and vscr). */ |
| 229 | int |
| 230 | ppc_altivec_support_p (struct gdbarch *gdbarch) |
| 231 | { |
| 232 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 233 | |
| 234 | return (tdep->ppc_vr0_regnum >= 0 |
| 235 | && tdep->ppc_vrsave_regnum >= 0); |
| 236 | } |
| 237 | |
| 238 | /* Check that TABLE[GDB_REGNO] is not already initialized, and then |
| 239 | set it to SIM_REGNO. |
| 240 | |
| 241 | This is a helper function for init_sim_regno_table, constructing |
| 242 | the table mapping GDB register numbers to sim register numbers; we |
| 243 | initialize every element in that table to -1 before we start |
| 244 | filling it in. */ |
| 245 | static void |
| 246 | set_sim_regno (int *table, int gdb_regno, int sim_regno) |
| 247 | { |
| 248 | /* Make sure we don't try to assign any given GDB register a sim |
| 249 | register number more than once. */ |
| 250 | gdb_assert (table[gdb_regno] == -1); |
| 251 | table[gdb_regno] = sim_regno; |
| 252 | } |
| 253 | |
| 254 | |
| 255 | /* Initialize ARCH->tdep->sim_regno, the table mapping GDB register |
| 256 | numbers to simulator register numbers, based on the values placed |
| 257 | in the ARCH->tdep->ppc_foo_regnum members. */ |
| 258 | static void |
| 259 | init_sim_regno_table (struct gdbarch *arch) |
| 260 | { |
| 261 | struct gdbarch_tdep *tdep = gdbarch_tdep (arch); |
| 262 | int total_regs = gdbarch_num_regs (arch); |
| 263 | int *sim_regno = GDBARCH_OBSTACK_CALLOC (arch, total_regs, int); |
| 264 | int i; |
| 265 | static const char *const segment_regs[] = { |
| 266 | "sr0", "sr1", "sr2", "sr3", "sr4", "sr5", "sr6", "sr7", |
| 267 | "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15" |
| 268 | }; |
| 269 | |
| 270 | /* Presume that all registers not explicitly mentioned below are |
| 271 | unavailable from the sim. */ |
| 272 | for (i = 0; i < total_regs; i++) |
| 273 | sim_regno[i] = -1; |
| 274 | |
| 275 | /* General-purpose registers. */ |
| 276 | for (i = 0; i < ppc_num_gprs; i++) |
| 277 | set_sim_regno (sim_regno, tdep->ppc_gp0_regnum + i, sim_ppc_r0_regnum + i); |
| 278 | |
| 279 | /* Floating-point registers. */ |
| 280 | if (tdep->ppc_fp0_regnum >= 0) |
| 281 | for (i = 0; i < ppc_num_fprs; i++) |
| 282 | set_sim_regno (sim_regno, |
| 283 | tdep->ppc_fp0_regnum + i, |
| 284 | sim_ppc_f0_regnum + i); |
| 285 | if (tdep->ppc_fpscr_regnum >= 0) |
| 286 | set_sim_regno (sim_regno, tdep->ppc_fpscr_regnum, sim_ppc_fpscr_regnum); |
| 287 | |
| 288 | set_sim_regno (sim_regno, gdbarch_pc_regnum (arch), sim_ppc_pc_regnum); |
| 289 | set_sim_regno (sim_regno, tdep->ppc_ps_regnum, sim_ppc_ps_regnum); |
| 290 | set_sim_regno (sim_regno, tdep->ppc_cr_regnum, sim_ppc_cr_regnum); |
| 291 | |
| 292 | /* Segment registers. */ |
| 293 | for (i = 0; i < ppc_num_srs; i++) |
| 294 | { |
| 295 | int gdb_regno; |
| 296 | |
| 297 | gdb_regno = user_reg_map_name_to_regnum (arch, segment_regs[i], -1); |
| 298 | if (gdb_regno >= 0) |
| 299 | set_sim_regno (sim_regno, gdb_regno, sim_ppc_sr0_regnum + i); |
| 300 | } |
| 301 | |
| 302 | /* Altivec registers. */ |
| 303 | if (tdep->ppc_vr0_regnum >= 0) |
| 304 | { |
| 305 | for (i = 0; i < ppc_num_vrs; i++) |
| 306 | set_sim_regno (sim_regno, |
| 307 | tdep->ppc_vr0_regnum + i, |
| 308 | sim_ppc_vr0_regnum + i); |
| 309 | |
| 310 | /* FIXME: jimb/2004-07-15: when we have tdep->ppc_vscr_regnum, |
| 311 | we can treat this more like the other cases. */ |
| 312 | set_sim_regno (sim_regno, |
| 313 | tdep->ppc_vr0_regnum + ppc_num_vrs, |
| 314 | sim_ppc_vscr_regnum); |
| 315 | } |
| 316 | /* vsave is a special-purpose register, so the code below handles it. */ |
| 317 | |
| 318 | /* SPE APU (E500) registers. */ |
| 319 | if (tdep->ppc_ev0_upper_regnum >= 0) |
| 320 | for (i = 0; i < ppc_num_gprs; i++) |
| 321 | set_sim_regno (sim_regno, |
| 322 | tdep->ppc_ev0_upper_regnum + i, |
| 323 | sim_ppc_rh0_regnum + i); |
| 324 | if (tdep->ppc_acc_regnum >= 0) |
| 325 | set_sim_regno (sim_regno, tdep->ppc_acc_regnum, sim_ppc_acc_regnum); |
| 326 | /* spefscr is a special-purpose register, so the code below handles it. */ |
| 327 | |
| 328 | #ifdef WITH_SIM |
| 329 | /* Now handle all special-purpose registers. Verify that they |
| 330 | haven't mistakenly been assigned numbers by any of the above |
| 331 | code. */ |
| 332 | for (i = 0; i < sim_ppc_num_sprs; i++) |
| 333 | { |
| 334 | const char *spr_name = sim_spr_register_name (i); |
| 335 | int gdb_regno = -1; |
| 336 | |
| 337 | if (spr_name != NULL) |
| 338 | gdb_regno = user_reg_map_name_to_regnum (arch, spr_name, -1); |
| 339 | |
| 340 | if (gdb_regno != -1) |
| 341 | set_sim_regno (sim_regno, gdb_regno, sim_ppc_spr0_regnum + i); |
| 342 | } |
| 343 | #endif |
| 344 | |
| 345 | /* Drop the initialized array into place. */ |
| 346 | tdep->sim_regno = sim_regno; |
| 347 | } |
| 348 | |
| 349 | |
| 350 | /* Given a GDB register number REG, return the corresponding SIM |
| 351 | register number. */ |
| 352 | static int |
| 353 | rs6000_register_sim_regno (struct gdbarch *gdbarch, int reg) |
| 354 | { |
| 355 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 356 | int sim_regno; |
| 357 | |
| 358 | if (tdep->sim_regno == NULL) |
| 359 | init_sim_regno_table (gdbarch); |
| 360 | |
| 361 | gdb_assert (0 <= reg |
| 362 | && reg <= gdbarch_num_regs (gdbarch) |
| 363 | + gdbarch_num_pseudo_regs (gdbarch)); |
| 364 | sim_regno = tdep->sim_regno[reg]; |
| 365 | |
| 366 | if (sim_regno >= 0) |
| 367 | return sim_regno; |
| 368 | else |
| 369 | return LEGACY_SIM_REGNO_IGNORE; |
| 370 | } |
| 371 | |
| 372 | \f |
| 373 | |
| 374 | /* Register set support functions. */ |
| 375 | |
| 376 | /* REGS + OFFSET contains register REGNUM in a field REGSIZE wide. |
| 377 | Write the register to REGCACHE. */ |
| 378 | |
| 379 | void |
| 380 | ppc_supply_reg (struct regcache *regcache, int regnum, |
| 381 | const gdb_byte *regs, size_t offset, int regsize) |
| 382 | { |
| 383 | if (regnum != -1 && offset != -1) |
| 384 | { |
| 385 | if (regsize > 4) |
| 386 | { |
| 387 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 388 | int gdb_regsize = register_size (gdbarch, regnum); |
| 389 | if (gdb_regsize < regsize |
| 390 | && gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 391 | offset += regsize - gdb_regsize; |
| 392 | } |
| 393 | regcache_raw_supply (regcache, regnum, regs + offset); |
| 394 | } |
| 395 | } |
| 396 | |
| 397 | /* Read register REGNUM from REGCACHE and store to REGS + OFFSET |
| 398 | in a field REGSIZE wide. Zero pad as necessary. */ |
| 399 | |
| 400 | void |
| 401 | ppc_collect_reg (const struct regcache *regcache, int regnum, |
| 402 | gdb_byte *regs, size_t offset, int regsize) |
| 403 | { |
| 404 | if (regnum != -1 && offset != -1) |
| 405 | { |
| 406 | if (regsize > 4) |
| 407 | { |
| 408 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 409 | int gdb_regsize = register_size (gdbarch, regnum); |
| 410 | if (gdb_regsize < regsize) |
| 411 | { |
| 412 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 413 | { |
| 414 | memset (regs + offset, 0, regsize - gdb_regsize); |
| 415 | offset += regsize - gdb_regsize; |
| 416 | } |
| 417 | else |
| 418 | memset (regs + offset + regsize - gdb_regsize, 0, |
| 419 | regsize - gdb_regsize); |
| 420 | } |
| 421 | } |
| 422 | regcache_raw_collect (regcache, regnum, regs + offset); |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | static int |
| 427 | ppc_greg_offset (struct gdbarch *gdbarch, |
| 428 | struct gdbarch_tdep *tdep, |
| 429 | const struct ppc_reg_offsets *offsets, |
| 430 | int regnum, |
| 431 | int *regsize) |
| 432 | { |
| 433 | *regsize = offsets->gpr_size; |
| 434 | if (regnum >= tdep->ppc_gp0_regnum |
| 435 | && regnum < tdep->ppc_gp0_regnum + ppc_num_gprs) |
| 436 | return (offsets->r0_offset |
| 437 | + (regnum - tdep->ppc_gp0_regnum) * offsets->gpr_size); |
| 438 | |
| 439 | if (regnum == gdbarch_pc_regnum (gdbarch)) |
| 440 | return offsets->pc_offset; |
| 441 | |
| 442 | if (regnum == tdep->ppc_ps_regnum) |
| 443 | return offsets->ps_offset; |
| 444 | |
| 445 | if (regnum == tdep->ppc_lr_regnum) |
| 446 | return offsets->lr_offset; |
| 447 | |
| 448 | if (regnum == tdep->ppc_ctr_regnum) |
| 449 | return offsets->ctr_offset; |
| 450 | |
| 451 | *regsize = offsets->xr_size; |
| 452 | if (regnum == tdep->ppc_cr_regnum) |
| 453 | return offsets->cr_offset; |
| 454 | |
| 455 | if (regnum == tdep->ppc_xer_regnum) |
| 456 | return offsets->xer_offset; |
| 457 | |
| 458 | if (regnum == tdep->ppc_mq_regnum) |
| 459 | return offsets->mq_offset; |
| 460 | |
| 461 | return -1; |
| 462 | } |
| 463 | |
| 464 | static int |
| 465 | ppc_fpreg_offset (struct gdbarch_tdep *tdep, |
| 466 | const struct ppc_reg_offsets *offsets, |
| 467 | int regnum) |
| 468 | { |
| 469 | if (regnum >= tdep->ppc_fp0_regnum |
| 470 | && regnum < tdep->ppc_fp0_regnum + ppc_num_fprs) |
| 471 | return offsets->f0_offset + (regnum - tdep->ppc_fp0_regnum) * 8; |
| 472 | |
| 473 | if (regnum == tdep->ppc_fpscr_regnum) |
| 474 | return offsets->fpscr_offset; |
| 475 | |
| 476 | return -1; |
| 477 | } |
| 478 | |
| 479 | static int |
| 480 | ppc_vrreg_offset (struct gdbarch_tdep *tdep, |
| 481 | const struct ppc_reg_offsets *offsets, |
| 482 | int regnum) |
| 483 | { |
| 484 | if (regnum >= tdep->ppc_vr0_regnum |
| 485 | && regnum < tdep->ppc_vr0_regnum + ppc_num_vrs) |
| 486 | return offsets->vr0_offset + (regnum - tdep->ppc_vr0_regnum) * 16; |
| 487 | |
| 488 | if (regnum == tdep->ppc_vrsave_regnum - 1) |
| 489 | return offsets->vscr_offset; |
| 490 | |
| 491 | if (regnum == tdep->ppc_vrsave_regnum) |
| 492 | return offsets->vrsave_offset; |
| 493 | |
| 494 | return -1; |
| 495 | } |
| 496 | |
| 497 | /* Supply register REGNUM in the general-purpose register set REGSET |
| 498 | from the buffer specified by GREGS and LEN to register cache |
| 499 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ |
| 500 | |
| 501 | void |
| 502 | ppc_supply_gregset (const struct regset *regset, struct regcache *regcache, |
| 503 | int regnum, const void *gregs, size_t len) |
| 504 | { |
| 505 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 506 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 507 | const struct ppc_reg_offsets *offsets = regset->descr; |
| 508 | size_t offset; |
| 509 | int regsize; |
| 510 | |
| 511 | if (regnum == -1) |
| 512 | { |
| 513 | int i; |
| 514 | int gpr_size = offsets->gpr_size; |
| 515 | |
| 516 | for (i = tdep->ppc_gp0_regnum, offset = offsets->r0_offset; |
| 517 | i < tdep->ppc_gp0_regnum + ppc_num_gprs; |
| 518 | i++, offset += gpr_size) |
| 519 | ppc_supply_reg (regcache, i, gregs, offset, gpr_size); |
| 520 | |
| 521 | ppc_supply_reg (regcache, gdbarch_pc_regnum (gdbarch), |
| 522 | gregs, offsets->pc_offset, gpr_size); |
| 523 | ppc_supply_reg (regcache, tdep->ppc_ps_regnum, |
| 524 | gregs, offsets->ps_offset, gpr_size); |
| 525 | ppc_supply_reg (regcache, tdep->ppc_lr_regnum, |
| 526 | gregs, offsets->lr_offset, gpr_size); |
| 527 | ppc_supply_reg (regcache, tdep->ppc_ctr_regnum, |
| 528 | gregs, offsets->ctr_offset, gpr_size); |
| 529 | ppc_supply_reg (regcache, tdep->ppc_cr_regnum, |
| 530 | gregs, offsets->cr_offset, offsets->xr_size); |
| 531 | ppc_supply_reg (regcache, tdep->ppc_xer_regnum, |
| 532 | gregs, offsets->xer_offset, offsets->xr_size); |
| 533 | ppc_supply_reg (regcache, tdep->ppc_mq_regnum, |
| 534 | gregs, offsets->mq_offset, offsets->xr_size); |
| 535 | return; |
| 536 | } |
| 537 | |
| 538 | offset = ppc_greg_offset (gdbarch, tdep, offsets, regnum, ®size); |
| 539 | ppc_supply_reg (regcache, regnum, gregs, offset, regsize); |
| 540 | } |
| 541 | |
| 542 | /* Supply register REGNUM in the floating-point register set REGSET |
| 543 | from the buffer specified by FPREGS and LEN to register cache |
| 544 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ |
| 545 | |
| 546 | void |
| 547 | ppc_supply_fpregset (const struct regset *regset, struct regcache *regcache, |
| 548 | int regnum, const void *fpregs, size_t len) |
| 549 | { |
| 550 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 551 | struct gdbarch_tdep *tdep; |
| 552 | const struct ppc_reg_offsets *offsets; |
| 553 | size_t offset; |
| 554 | |
| 555 | if (!ppc_floating_point_unit_p (gdbarch)) |
| 556 | return; |
| 557 | |
| 558 | tdep = gdbarch_tdep (gdbarch); |
| 559 | offsets = regset->descr; |
| 560 | if (regnum == -1) |
| 561 | { |
| 562 | int i; |
| 563 | |
| 564 | for (i = tdep->ppc_fp0_regnum, offset = offsets->f0_offset; |
| 565 | i < tdep->ppc_fp0_regnum + ppc_num_fprs; |
| 566 | i++, offset += 8) |
| 567 | ppc_supply_reg (regcache, i, fpregs, offset, 8); |
| 568 | |
| 569 | ppc_supply_reg (regcache, tdep->ppc_fpscr_regnum, |
| 570 | fpregs, offsets->fpscr_offset, offsets->fpscr_size); |
| 571 | return; |
| 572 | } |
| 573 | |
| 574 | offset = ppc_fpreg_offset (tdep, offsets, regnum); |
| 575 | ppc_supply_reg (regcache, regnum, fpregs, offset, |
| 576 | regnum == tdep->ppc_fpscr_regnum ? offsets->fpscr_size : 8); |
| 577 | } |
| 578 | |
| 579 | /* Supply register REGNUM in the VSX register set REGSET |
| 580 | from the buffer specified by VSXREGS and LEN to register cache |
| 581 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ |
| 582 | |
| 583 | void |
| 584 | ppc_supply_vsxregset (const struct regset *regset, struct regcache *regcache, |
| 585 | int regnum, const void *vsxregs, size_t len) |
| 586 | { |
| 587 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 588 | struct gdbarch_tdep *tdep; |
| 589 | |
| 590 | if (!ppc_vsx_support_p (gdbarch)) |
| 591 | return; |
| 592 | |
| 593 | tdep = gdbarch_tdep (gdbarch); |
| 594 | |
| 595 | if (regnum == -1) |
| 596 | { |
| 597 | int i; |
| 598 | |
| 599 | for (i = tdep->ppc_vsr0_upper_regnum; |
| 600 | i < tdep->ppc_vsr0_upper_regnum + 32; |
| 601 | i++) |
| 602 | ppc_supply_reg (regcache, i, vsxregs, 0, 8); |
| 603 | |
| 604 | return; |
| 605 | } |
| 606 | else |
| 607 | ppc_supply_reg (regcache, regnum, vsxregs, 0, 8); |
| 608 | } |
| 609 | |
| 610 | /* Supply register REGNUM in the Altivec register set REGSET |
| 611 | from the buffer specified by VRREGS and LEN to register cache |
| 612 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ |
| 613 | |
| 614 | void |
| 615 | ppc_supply_vrregset (const struct regset *regset, struct regcache *regcache, |
| 616 | int regnum, const void *vrregs, size_t len) |
| 617 | { |
| 618 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 619 | struct gdbarch_tdep *tdep; |
| 620 | const struct ppc_reg_offsets *offsets; |
| 621 | size_t offset; |
| 622 | |
| 623 | if (!ppc_altivec_support_p (gdbarch)) |
| 624 | return; |
| 625 | |
| 626 | tdep = gdbarch_tdep (gdbarch); |
| 627 | offsets = regset->descr; |
| 628 | if (regnum == -1) |
| 629 | { |
| 630 | int i; |
| 631 | |
| 632 | for (i = tdep->ppc_vr0_regnum, offset = offsets->vr0_offset; |
| 633 | i < tdep->ppc_vr0_regnum + ppc_num_vrs; |
| 634 | i++, offset += 16) |
| 635 | ppc_supply_reg (regcache, i, vrregs, offset, 16); |
| 636 | |
| 637 | ppc_supply_reg (regcache, (tdep->ppc_vrsave_regnum - 1), |
| 638 | vrregs, offsets->vscr_offset, 4); |
| 639 | |
| 640 | ppc_supply_reg (regcache, tdep->ppc_vrsave_regnum, |
| 641 | vrregs, offsets->vrsave_offset, 4); |
| 642 | return; |
| 643 | } |
| 644 | |
| 645 | offset = ppc_vrreg_offset (tdep, offsets, regnum); |
| 646 | if (regnum != tdep->ppc_vrsave_regnum |
| 647 | && regnum != tdep->ppc_vrsave_regnum - 1) |
| 648 | ppc_supply_reg (regcache, regnum, vrregs, offset, 16); |
| 649 | else |
| 650 | ppc_supply_reg (regcache, regnum, |
| 651 | vrregs, offset, 4); |
| 652 | } |
| 653 | |
| 654 | /* Collect register REGNUM in the general-purpose register set |
| 655 | REGSET from register cache REGCACHE into the buffer specified by |
| 656 | GREGS and LEN. If REGNUM is -1, do this for all registers in |
| 657 | REGSET. */ |
| 658 | |
| 659 | void |
| 660 | ppc_collect_gregset (const struct regset *regset, |
| 661 | const struct regcache *regcache, |
| 662 | int regnum, void *gregs, size_t len) |
| 663 | { |
| 664 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 665 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 666 | const struct ppc_reg_offsets *offsets = regset->descr; |
| 667 | size_t offset; |
| 668 | int regsize; |
| 669 | |
| 670 | if (regnum == -1) |
| 671 | { |
| 672 | int i; |
| 673 | int gpr_size = offsets->gpr_size; |
| 674 | |
| 675 | for (i = tdep->ppc_gp0_regnum, offset = offsets->r0_offset; |
| 676 | i < tdep->ppc_gp0_regnum + ppc_num_gprs; |
| 677 | i++, offset += gpr_size) |
| 678 | ppc_collect_reg (regcache, i, gregs, offset, gpr_size); |
| 679 | |
| 680 | ppc_collect_reg (regcache, gdbarch_pc_regnum (gdbarch), |
| 681 | gregs, offsets->pc_offset, gpr_size); |
| 682 | ppc_collect_reg (regcache, tdep->ppc_ps_regnum, |
| 683 | gregs, offsets->ps_offset, gpr_size); |
| 684 | ppc_collect_reg (regcache, tdep->ppc_lr_regnum, |
| 685 | gregs, offsets->lr_offset, gpr_size); |
| 686 | ppc_collect_reg (regcache, tdep->ppc_ctr_regnum, |
| 687 | gregs, offsets->ctr_offset, gpr_size); |
| 688 | ppc_collect_reg (regcache, tdep->ppc_cr_regnum, |
| 689 | gregs, offsets->cr_offset, offsets->xr_size); |
| 690 | ppc_collect_reg (regcache, tdep->ppc_xer_regnum, |
| 691 | gregs, offsets->xer_offset, offsets->xr_size); |
| 692 | ppc_collect_reg (regcache, tdep->ppc_mq_regnum, |
| 693 | gregs, offsets->mq_offset, offsets->xr_size); |
| 694 | return; |
| 695 | } |
| 696 | |
| 697 | offset = ppc_greg_offset (gdbarch, tdep, offsets, regnum, ®size); |
| 698 | ppc_collect_reg (regcache, regnum, gregs, offset, regsize); |
| 699 | } |
| 700 | |
| 701 | /* Collect register REGNUM in the floating-point register set |
| 702 | REGSET from register cache REGCACHE into the buffer specified by |
| 703 | FPREGS and LEN. If REGNUM is -1, do this for all registers in |
| 704 | REGSET. */ |
| 705 | |
| 706 | void |
| 707 | ppc_collect_fpregset (const struct regset *regset, |
| 708 | const struct regcache *regcache, |
| 709 | int regnum, void *fpregs, size_t len) |
| 710 | { |
| 711 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 712 | struct gdbarch_tdep *tdep; |
| 713 | const struct ppc_reg_offsets *offsets; |
| 714 | size_t offset; |
| 715 | |
| 716 | if (!ppc_floating_point_unit_p (gdbarch)) |
| 717 | return; |
| 718 | |
| 719 | tdep = gdbarch_tdep (gdbarch); |
| 720 | offsets = regset->descr; |
| 721 | if (regnum == -1) |
| 722 | { |
| 723 | int i; |
| 724 | |
| 725 | for (i = tdep->ppc_fp0_regnum, offset = offsets->f0_offset; |
| 726 | i < tdep->ppc_fp0_regnum + ppc_num_fprs; |
| 727 | i++, offset += 8) |
| 728 | ppc_collect_reg (regcache, i, fpregs, offset, 8); |
| 729 | |
| 730 | ppc_collect_reg (regcache, tdep->ppc_fpscr_regnum, |
| 731 | fpregs, offsets->fpscr_offset, offsets->fpscr_size); |
| 732 | return; |
| 733 | } |
| 734 | |
| 735 | offset = ppc_fpreg_offset (tdep, offsets, regnum); |
| 736 | ppc_collect_reg (regcache, regnum, fpregs, offset, |
| 737 | regnum == tdep->ppc_fpscr_regnum ? offsets->fpscr_size : 8); |
| 738 | } |
| 739 | |
| 740 | /* Collect register REGNUM in the VSX register set |
| 741 | REGSET from register cache REGCACHE into the buffer specified by |
| 742 | VSXREGS and LEN. If REGNUM is -1, do this for all registers in |
| 743 | REGSET. */ |
| 744 | |
| 745 | void |
| 746 | ppc_collect_vsxregset (const struct regset *regset, |
| 747 | const struct regcache *regcache, |
| 748 | int regnum, void *vsxregs, size_t len) |
| 749 | { |
| 750 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 751 | struct gdbarch_tdep *tdep; |
| 752 | |
| 753 | if (!ppc_vsx_support_p (gdbarch)) |
| 754 | return; |
| 755 | |
| 756 | tdep = gdbarch_tdep (gdbarch); |
| 757 | |
| 758 | if (regnum == -1) |
| 759 | { |
| 760 | int i; |
| 761 | |
| 762 | for (i = tdep->ppc_vsr0_upper_regnum; |
| 763 | i < tdep->ppc_vsr0_upper_regnum + 32; |
| 764 | i++) |
| 765 | ppc_collect_reg (regcache, i, vsxregs, 0, 8); |
| 766 | |
| 767 | return; |
| 768 | } |
| 769 | else |
| 770 | ppc_collect_reg (regcache, regnum, vsxregs, 0, 8); |
| 771 | } |
| 772 | |
| 773 | |
| 774 | /* Collect register REGNUM in the Altivec register set |
| 775 | REGSET from register cache REGCACHE into the buffer specified by |
| 776 | VRREGS and LEN. If REGNUM is -1, do this for all registers in |
| 777 | REGSET. */ |
| 778 | |
| 779 | void |
| 780 | ppc_collect_vrregset (const struct regset *regset, |
| 781 | const struct regcache *regcache, |
| 782 | int regnum, void *vrregs, size_t len) |
| 783 | { |
| 784 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 785 | struct gdbarch_tdep *tdep; |
| 786 | const struct ppc_reg_offsets *offsets; |
| 787 | size_t offset; |
| 788 | |
| 789 | if (!ppc_altivec_support_p (gdbarch)) |
| 790 | return; |
| 791 | |
| 792 | tdep = gdbarch_tdep (gdbarch); |
| 793 | offsets = regset->descr; |
| 794 | if (regnum == -1) |
| 795 | { |
| 796 | int i; |
| 797 | |
| 798 | for (i = tdep->ppc_vr0_regnum, offset = offsets->vr0_offset; |
| 799 | i < tdep->ppc_vr0_regnum + ppc_num_vrs; |
| 800 | i++, offset += 16) |
| 801 | ppc_collect_reg (regcache, i, vrregs, offset, 16); |
| 802 | |
| 803 | ppc_collect_reg (regcache, (tdep->ppc_vrsave_regnum - 1), |
| 804 | vrregs, offsets->vscr_offset, 4); |
| 805 | |
| 806 | ppc_collect_reg (regcache, tdep->ppc_vrsave_regnum, |
| 807 | vrregs, offsets->vrsave_offset, 4); |
| 808 | return; |
| 809 | } |
| 810 | |
| 811 | offset = ppc_vrreg_offset (tdep, offsets, regnum); |
| 812 | if (regnum != tdep->ppc_vrsave_regnum |
| 813 | && regnum != tdep->ppc_vrsave_regnum - 1) |
| 814 | ppc_collect_reg (regcache, regnum, vrregs, offset, 16); |
| 815 | else |
| 816 | ppc_collect_reg (regcache, regnum, |
| 817 | vrregs, offset, 4); |
| 818 | } |
| 819 | \f |
| 820 | |
| 821 | static int |
| 822 | insn_changes_sp_or_jumps (unsigned long insn) |
| 823 | { |
| 824 | int opcode = (insn >> 26) & 0x03f; |
| 825 | int sd = (insn >> 21) & 0x01f; |
| 826 | int a = (insn >> 16) & 0x01f; |
| 827 | int subcode = (insn >> 1) & 0x3ff; |
| 828 | |
| 829 | /* Changes the stack pointer. */ |
| 830 | |
| 831 | /* NOTE: There are many ways to change the value of a given register. |
| 832 | The ways below are those used when the register is R1, the SP, |
| 833 | in a funtion's epilogue. */ |
| 834 | |
| 835 | if (opcode == 31 && subcode == 444 && a == 1) |
| 836 | return 1; /* mr R1,Rn */ |
| 837 | if (opcode == 14 && sd == 1) |
| 838 | return 1; /* addi R1,Rn,simm */ |
| 839 | if (opcode == 58 && sd == 1) |
| 840 | return 1; /* ld R1,ds(Rn) */ |
| 841 | |
| 842 | /* Transfers control. */ |
| 843 | |
| 844 | if (opcode == 18) |
| 845 | return 1; /* b */ |
| 846 | if (opcode == 16) |
| 847 | return 1; /* bc */ |
| 848 | if (opcode == 19 && subcode == 16) |
| 849 | return 1; /* bclr */ |
| 850 | if (opcode == 19 && subcode == 528) |
| 851 | return 1; /* bcctr */ |
| 852 | |
| 853 | return 0; |
| 854 | } |
| 855 | |
| 856 | /* Return true if we are in the function's epilogue, i.e. after the |
| 857 | instruction that destroyed the function's stack frame. |
| 858 | |
| 859 | 1) scan forward from the point of execution: |
| 860 | a) If you find an instruction that modifies the stack pointer |
| 861 | or transfers control (except a return), execution is not in |
| 862 | an epilogue, return. |
| 863 | b) Stop scanning if you find a return instruction or reach the |
| 864 | end of the function or reach the hard limit for the size of |
| 865 | an epilogue. |
| 866 | 2) scan backward from the point of execution: |
| 867 | a) If you find an instruction that modifies the stack pointer, |
| 868 | execution *is* in an epilogue, return. |
| 869 | b) Stop scanning if you reach an instruction that transfers |
| 870 | control or the beginning of the function or reach the hard |
| 871 | limit for the size of an epilogue. */ |
| 872 | |
| 873 | static int |
| 874 | rs6000_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 875 | { |
| 876 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 877 | bfd_byte insn_buf[PPC_INSN_SIZE]; |
| 878 | CORE_ADDR scan_pc, func_start, func_end, epilogue_start, epilogue_end; |
| 879 | unsigned long insn; |
| 880 | struct frame_info *curfrm; |
| 881 | |
| 882 | /* Find the search limits based on function boundaries and hard limit. */ |
| 883 | |
| 884 | if (!find_pc_partial_function (pc, NULL, &func_start, &func_end)) |
| 885 | return 0; |
| 886 | |
| 887 | epilogue_start = pc - PPC_MAX_EPILOGUE_INSTRUCTIONS * PPC_INSN_SIZE; |
| 888 | if (epilogue_start < func_start) epilogue_start = func_start; |
| 889 | |
| 890 | epilogue_end = pc + PPC_MAX_EPILOGUE_INSTRUCTIONS * PPC_INSN_SIZE; |
| 891 | if (epilogue_end > func_end) epilogue_end = func_end; |
| 892 | |
| 893 | curfrm = get_current_frame (); |
| 894 | |
| 895 | /* Scan forward until next 'blr'. */ |
| 896 | |
| 897 | for (scan_pc = pc; scan_pc < epilogue_end; scan_pc += PPC_INSN_SIZE) |
| 898 | { |
| 899 | if (!safe_frame_unwind_memory (curfrm, scan_pc, insn_buf, PPC_INSN_SIZE)) |
| 900 | return 0; |
| 901 | insn = extract_unsigned_integer (insn_buf, PPC_INSN_SIZE); |
| 902 | if (insn == 0x4e800020) |
| 903 | break; |
| 904 | /* Assume a bctr is a tail call unless it points strictly within |
| 905 | this function. */ |
| 906 | if (insn == 0x4e800420) |
| 907 | { |
| 908 | CORE_ADDR ctr = get_frame_register_unsigned (curfrm, |
| 909 | tdep->ppc_ctr_regnum); |
| 910 | if (ctr > func_start && ctr < func_end) |
| 911 | return 0; |
| 912 | else |
| 913 | break; |
| 914 | } |
| 915 | if (insn_changes_sp_or_jumps (insn)) |
| 916 | return 0; |
| 917 | } |
| 918 | |
| 919 | /* Scan backward until adjustment to stack pointer (R1). */ |
| 920 | |
| 921 | for (scan_pc = pc - PPC_INSN_SIZE; |
| 922 | scan_pc >= epilogue_start; |
| 923 | scan_pc -= PPC_INSN_SIZE) |
| 924 | { |
| 925 | if (!safe_frame_unwind_memory (curfrm, scan_pc, insn_buf, PPC_INSN_SIZE)) |
| 926 | return 0; |
| 927 | insn = extract_unsigned_integer (insn_buf, PPC_INSN_SIZE); |
| 928 | if (insn_changes_sp_or_jumps (insn)) |
| 929 | return 1; |
| 930 | } |
| 931 | |
| 932 | return 0; |
| 933 | } |
| 934 | |
| 935 | /* Get the ith function argument for the current function. */ |
| 936 | static CORE_ADDR |
| 937 | rs6000_fetch_pointer_argument (struct frame_info *frame, int argi, |
| 938 | struct type *type) |
| 939 | { |
| 940 | return get_frame_register_unsigned (frame, 3 + argi); |
| 941 | } |
| 942 | |
| 943 | /* Sequence of bytes for breakpoint instruction. */ |
| 944 | |
| 945 | const static unsigned char * |
| 946 | rs6000_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *bp_addr, |
| 947 | int *bp_size) |
| 948 | { |
| 949 | static unsigned char big_breakpoint[] = { 0x7d, 0x82, 0x10, 0x08 }; |
| 950 | static unsigned char little_breakpoint[] = { 0x08, 0x10, 0x82, 0x7d }; |
| 951 | *bp_size = 4; |
| 952 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 953 | return big_breakpoint; |
| 954 | else |
| 955 | return little_breakpoint; |
| 956 | } |
| 957 | |
| 958 | /* Instruction masks for displaced stepping. */ |
| 959 | #define BRANCH_MASK 0xfc000000 |
| 960 | #define BP_MASK 0xFC0007FE |
| 961 | #define B_INSN 0x48000000 |
| 962 | #define BC_INSN 0x40000000 |
| 963 | #define BXL_INSN 0x4c000000 |
| 964 | #define BP_INSN 0x7C000008 |
| 965 | |
| 966 | /* Fix up the state of registers and memory after having single-stepped |
| 967 | a displaced instruction. */ |
| 968 | static void |
| 969 | ppc_displaced_step_fixup (struct gdbarch *gdbarch, |
| 970 | struct displaced_step_closure *closure, |
| 971 | CORE_ADDR from, CORE_ADDR to, |
| 972 | struct regcache *regs) |
| 973 | { |
| 974 | /* Since we use simple_displaced_step_copy_insn, our closure is a |
| 975 | copy of the instruction. */ |
| 976 | ULONGEST insn = extract_unsigned_integer ((gdb_byte *) closure, |
| 977 | PPC_INSN_SIZE); |
| 978 | ULONGEST opcode = 0; |
| 979 | /* Offset for non PC-relative instructions. */ |
| 980 | LONGEST offset = PPC_INSN_SIZE; |
| 981 | |
| 982 | opcode = insn & BRANCH_MASK; |
| 983 | |
| 984 | if (debug_displaced) |
| 985 | fprintf_unfiltered (gdb_stdlog, |
| 986 | "displaced: (ppc) fixup (0x%s, 0x%s)\n", |
| 987 | paddr_nz (from), paddr_nz (to)); |
| 988 | |
| 989 | |
| 990 | /* Handle PC-relative branch instructions. */ |
| 991 | if (opcode == B_INSN || opcode == BC_INSN || opcode == BXL_INSN) |
| 992 | { |
| 993 | ULONGEST current_pc; |
| 994 | |
| 995 | /* Read the current PC value after the instruction has been executed |
| 996 | in a displaced location. Calculate the offset to be applied to the |
| 997 | original PC value before the displaced stepping. */ |
| 998 | regcache_cooked_read_unsigned (regs, gdbarch_pc_regnum (gdbarch), |
| 999 | ¤t_pc); |
| 1000 | offset = current_pc - to; |
| 1001 | |
| 1002 | if (opcode != BXL_INSN) |
| 1003 | { |
| 1004 | /* Check for AA bit indicating whether this is an absolute |
| 1005 | addressing or PC-relative (1: absolute, 0: relative). */ |
| 1006 | if (!(insn & 0x2)) |
| 1007 | { |
| 1008 | /* PC-relative addressing is being used in the branch. */ |
| 1009 | if (debug_displaced) |
| 1010 | fprintf_unfiltered |
| 1011 | (gdb_stdlog, |
| 1012 | "displaced: (ppc) branch instruction: 0x%s\n" |
| 1013 | "displaced: (ppc) adjusted PC from 0x%s to 0x%s\n", |
| 1014 | paddr_nz (insn), paddr_nz (current_pc), |
| 1015 | paddr_nz (from + offset)); |
| 1016 | |
| 1017 | regcache_cooked_write_unsigned (regs, gdbarch_pc_regnum (gdbarch), |
| 1018 | from + offset); |
| 1019 | } |
| 1020 | } |
| 1021 | else |
| 1022 | { |
| 1023 | /* If we're here, it means we have a branch to LR or CTR. If the |
| 1024 | branch was taken, the offset is probably greater than 4 (the next |
| 1025 | instruction), so it's safe to assume that an offset of 4 means we |
| 1026 | did not take the branch. */ |
| 1027 | if (offset == PPC_INSN_SIZE) |
| 1028 | regcache_cooked_write_unsigned (regs, gdbarch_pc_regnum (gdbarch), |
| 1029 | from + PPC_INSN_SIZE); |
| 1030 | } |
| 1031 | |
| 1032 | /* Check for LK bit indicating whether we should set the link |
| 1033 | register to point to the next instruction |
| 1034 | (1: Set, 0: Don't set). */ |
| 1035 | if (insn & 0x1) |
| 1036 | { |
| 1037 | /* Link register needs to be set to the next instruction's PC. */ |
| 1038 | regcache_cooked_write_unsigned (regs, |
| 1039 | gdbarch_tdep (gdbarch)->ppc_lr_regnum, |
| 1040 | from + PPC_INSN_SIZE); |
| 1041 | if (debug_displaced) |
| 1042 | fprintf_unfiltered (gdb_stdlog, |
| 1043 | "displaced: (ppc) adjusted LR to 0x%s\n", |
| 1044 | paddr_nz (from + PPC_INSN_SIZE)); |
| 1045 | |
| 1046 | } |
| 1047 | } |
| 1048 | /* Check for breakpoints in the inferior. If we've found one, place the PC |
| 1049 | right at the breakpoint instruction. */ |
| 1050 | else if ((insn & BP_MASK) == BP_INSN) |
| 1051 | regcache_cooked_write_unsigned (regs, gdbarch_pc_regnum (gdbarch), from); |
| 1052 | else |
| 1053 | /* Handle any other instructions that do not fit in the categories above. */ |
| 1054 | regcache_cooked_write_unsigned (regs, gdbarch_pc_regnum (gdbarch), |
| 1055 | from + offset); |
| 1056 | } |
| 1057 | |
| 1058 | /* Instruction masks used during single-stepping of atomic sequences. */ |
| 1059 | #define LWARX_MASK 0xfc0007fe |
| 1060 | #define LWARX_INSTRUCTION 0x7c000028 |
| 1061 | #define LDARX_INSTRUCTION 0x7c0000A8 |
| 1062 | #define STWCX_MASK 0xfc0007ff |
| 1063 | #define STWCX_INSTRUCTION 0x7c00012d |
| 1064 | #define STDCX_INSTRUCTION 0x7c0001ad |
| 1065 | |
| 1066 | /* Checks for an atomic sequence of instructions beginning with a LWARX/LDARX |
| 1067 | instruction and ending with a STWCX/STDCX instruction. If such a sequence |
| 1068 | is found, attempt to step through it. A breakpoint is placed at the end of |
| 1069 | the sequence. */ |
| 1070 | |
| 1071 | int |
| 1072 | ppc_deal_with_atomic_sequence (struct frame_info *frame) |
| 1073 | { |
| 1074 | CORE_ADDR pc = get_frame_pc (frame); |
| 1075 | CORE_ADDR breaks[2] = {-1, -1}; |
| 1076 | CORE_ADDR loc = pc; |
| 1077 | CORE_ADDR closing_insn; /* Instruction that closes the atomic sequence. */ |
| 1078 | int insn = read_memory_integer (loc, PPC_INSN_SIZE); |
| 1079 | int insn_count; |
| 1080 | int index; |
| 1081 | int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed). */ |
| 1082 | const int atomic_sequence_length = 16; /* Instruction sequence length. */ |
| 1083 | int opcode; /* Branch instruction's OPcode. */ |
| 1084 | int bc_insn_count = 0; /* Conditional branch instruction count. */ |
| 1085 | |
| 1086 | /* Assume all atomic sequences start with a lwarx/ldarx instruction. */ |
| 1087 | if ((insn & LWARX_MASK) != LWARX_INSTRUCTION |
| 1088 | && (insn & LWARX_MASK) != LDARX_INSTRUCTION) |
| 1089 | return 0; |
| 1090 | |
| 1091 | /* Assume that no atomic sequence is longer than "atomic_sequence_length" |
| 1092 | instructions. */ |
| 1093 | for (insn_count = 0; insn_count < atomic_sequence_length; ++insn_count) |
| 1094 | { |
| 1095 | loc += PPC_INSN_SIZE; |
| 1096 | insn = read_memory_integer (loc, PPC_INSN_SIZE); |
| 1097 | |
| 1098 | /* Assume that there is at most one conditional branch in the atomic |
| 1099 | sequence. If a conditional branch is found, put a breakpoint in |
| 1100 | its destination address. */ |
| 1101 | if ((insn & BRANCH_MASK) == BC_INSN) |
| 1102 | { |
| 1103 | int immediate = ((insn & ~3) << 16) >> 16; |
| 1104 | int absolute = ((insn >> 1) & 1); |
| 1105 | |
| 1106 | if (bc_insn_count >= 1) |
| 1107 | return 0; /* More than one conditional branch found, fallback |
| 1108 | to the standard single-step code. */ |
| 1109 | |
| 1110 | if (absolute) |
| 1111 | breaks[1] = immediate; |
| 1112 | else |
| 1113 | breaks[1] = pc + immediate; |
| 1114 | |
| 1115 | bc_insn_count++; |
| 1116 | last_breakpoint++; |
| 1117 | } |
| 1118 | |
| 1119 | if ((insn & STWCX_MASK) == STWCX_INSTRUCTION |
| 1120 | || (insn & STWCX_MASK) == STDCX_INSTRUCTION) |
| 1121 | break; |
| 1122 | } |
| 1123 | |
| 1124 | /* Assume that the atomic sequence ends with a stwcx/stdcx instruction. */ |
| 1125 | if ((insn & STWCX_MASK) != STWCX_INSTRUCTION |
| 1126 | && (insn & STWCX_MASK) != STDCX_INSTRUCTION) |
| 1127 | return 0; |
| 1128 | |
| 1129 | closing_insn = loc; |
| 1130 | loc += PPC_INSN_SIZE; |
| 1131 | insn = read_memory_integer (loc, PPC_INSN_SIZE); |
| 1132 | |
| 1133 | /* Insert a breakpoint right after the end of the atomic sequence. */ |
| 1134 | breaks[0] = loc; |
| 1135 | |
| 1136 | /* Check for duplicated breakpoints. Check also for a breakpoint |
| 1137 | placed (branch instruction's destination) at the stwcx/stdcx |
| 1138 | instruction, this resets the reservation and take us back to the |
| 1139 | lwarx/ldarx instruction at the beginning of the atomic sequence. */ |
| 1140 | if (last_breakpoint && ((breaks[1] == breaks[0]) |
| 1141 | || (breaks[1] == closing_insn))) |
| 1142 | last_breakpoint = 0; |
| 1143 | |
| 1144 | /* Effectively inserts the breakpoints. */ |
| 1145 | for (index = 0; index <= last_breakpoint; index++) |
| 1146 | insert_single_step_breakpoint (breaks[index]); |
| 1147 | |
| 1148 | return 1; |
| 1149 | } |
| 1150 | |
| 1151 | |
| 1152 | #define SIGNED_SHORT(x) \ |
| 1153 | ((sizeof (short) == 2) \ |
| 1154 | ? ((int)(short)(x)) \ |
| 1155 | : ((int)((((x) & 0xffff) ^ 0x8000) - 0x8000))) |
| 1156 | |
| 1157 | #define GET_SRC_REG(x) (((x) >> 21) & 0x1f) |
| 1158 | |
| 1159 | /* Limit the number of skipped non-prologue instructions, as the examining |
| 1160 | of the prologue is expensive. */ |
| 1161 | static int max_skip_non_prologue_insns = 10; |
| 1162 | |
| 1163 | /* Return nonzero if the given instruction OP can be part of the prologue |
| 1164 | of a function and saves a parameter on the stack. FRAMEP should be |
| 1165 | set if one of the previous instructions in the function has set the |
| 1166 | Frame Pointer. */ |
| 1167 | |
| 1168 | static int |
| 1169 | store_param_on_stack_p (unsigned long op, int framep, int *r0_contains_arg) |
| 1170 | { |
| 1171 | /* Move parameters from argument registers to temporary register. */ |
| 1172 | if ((op & 0xfc0007fe) == 0x7c000378) /* mr(.) Rx,Ry */ |
| 1173 | { |
| 1174 | /* Rx must be scratch register r0. */ |
| 1175 | const int rx_regno = (op >> 16) & 31; |
| 1176 | /* Ry: Only r3 - r10 are used for parameter passing. */ |
| 1177 | const int ry_regno = GET_SRC_REG (op); |
| 1178 | |
| 1179 | if (rx_regno == 0 && ry_regno >= 3 && ry_regno <= 10) |
| 1180 | { |
| 1181 | *r0_contains_arg = 1; |
| 1182 | return 1; |
| 1183 | } |
| 1184 | else |
| 1185 | return 0; |
| 1186 | } |
| 1187 | |
| 1188 | /* Save a General Purpose Register on stack. */ |
| 1189 | |
| 1190 | if ((op & 0xfc1f0003) == 0xf8010000 || /* std Rx,NUM(r1) */ |
| 1191 | (op & 0xfc1f0000) == 0xd8010000) /* stfd Rx,NUM(r1) */ |
| 1192 | { |
| 1193 | /* Rx: Only r3 - r10 are used for parameter passing. */ |
| 1194 | const int rx_regno = GET_SRC_REG (op); |
| 1195 | |
| 1196 | return (rx_regno >= 3 && rx_regno <= 10); |
| 1197 | } |
| 1198 | |
| 1199 | /* Save a General Purpose Register on stack via the Frame Pointer. */ |
| 1200 | |
| 1201 | if (framep && |
| 1202 | ((op & 0xfc1f0000) == 0x901f0000 || /* st rx,NUM(r31) */ |
| 1203 | (op & 0xfc1f0000) == 0x981f0000 || /* stb Rx,NUM(r31) */ |
| 1204 | (op & 0xfc1f0000) == 0xd81f0000)) /* stfd Rx,NUM(r31) */ |
| 1205 | { |
| 1206 | /* Rx: Usually, only r3 - r10 are used for parameter passing. |
| 1207 | However, the compiler sometimes uses r0 to hold an argument. */ |
| 1208 | const int rx_regno = GET_SRC_REG (op); |
| 1209 | |
| 1210 | return ((rx_regno >= 3 && rx_regno <= 10) |
| 1211 | || (rx_regno == 0 && *r0_contains_arg)); |
| 1212 | } |
| 1213 | |
| 1214 | if ((op & 0xfc1f0000) == 0xfc010000) /* frsp, fp?,NUM(r1) */ |
| 1215 | { |
| 1216 | /* Only f2 - f8 are used for parameter passing. */ |
| 1217 | const int src_regno = GET_SRC_REG (op); |
| 1218 | |
| 1219 | return (src_regno >= 2 && src_regno <= 8); |
| 1220 | } |
| 1221 | |
| 1222 | if (framep && ((op & 0xfc1f0000) == 0xfc1f0000)) /* frsp, fp?,NUM(r31) */ |
| 1223 | { |
| 1224 | /* Only f2 - f8 are used for parameter passing. */ |
| 1225 | const int src_regno = GET_SRC_REG (op); |
| 1226 | |
| 1227 | return (src_regno >= 2 && src_regno <= 8); |
| 1228 | } |
| 1229 | |
| 1230 | /* Not an insn that saves a parameter on stack. */ |
| 1231 | return 0; |
| 1232 | } |
| 1233 | |
| 1234 | /* Assuming that INSN is a "bl" instruction located at PC, return |
| 1235 | nonzero if the destination of the branch is a "blrl" instruction. |
| 1236 | |
| 1237 | This sequence is sometimes found in certain function prologues. |
| 1238 | It allows the function to load the LR register with a value that |
| 1239 | they can use to access PIC data using PC-relative offsets. */ |
| 1240 | |
| 1241 | static int |
| 1242 | bl_to_blrl_insn_p (CORE_ADDR pc, int insn) |
| 1243 | { |
| 1244 | CORE_ADDR dest; |
| 1245 | int immediate; |
| 1246 | int absolute; |
| 1247 | int dest_insn; |
| 1248 | |
| 1249 | absolute = (int) ((insn >> 1) & 1); |
| 1250 | immediate = ((insn & ~3) << 6) >> 6; |
| 1251 | if (absolute) |
| 1252 | dest = immediate; |
| 1253 | else |
| 1254 | dest = pc + immediate; |
| 1255 | |
| 1256 | dest_insn = read_memory_integer (dest, 4); |
| 1257 | if ((dest_insn & 0xfc00ffff) == 0x4c000021) /* blrl */ |
| 1258 | return 1; |
| 1259 | |
| 1260 | return 0; |
| 1261 | } |
| 1262 | |
| 1263 | /* Masks for decoding a branch-and-link (bl) instruction. |
| 1264 | |
| 1265 | BL_MASK and BL_INSTRUCTION are used in combination with each other. |
| 1266 | The former is anded with the opcode in question; if the result of |
| 1267 | this masking operation is equal to BL_INSTRUCTION, then the opcode in |
| 1268 | question is a ``bl'' instruction. |
| 1269 | |
| 1270 | BL_DISPLACMENT_MASK is anded with the opcode in order to extract |
| 1271 | the branch displacement. */ |
| 1272 | |
| 1273 | #define BL_MASK 0xfc000001 |
| 1274 | #define BL_INSTRUCTION 0x48000001 |
| 1275 | #define BL_DISPLACEMENT_MASK 0x03fffffc |
| 1276 | |
| 1277 | static unsigned long |
| 1278 | rs6000_fetch_instruction (const CORE_ADDR pc) |
| 1279 | { |
| 1280 | gdb_byte buf[4]; |
| 1281 | unsigned long op; |
| 1282 | |
| 1283 | /* Fetch the instruction and convert it to an integer. */ |
| 1284 | if (target_read_memory (pc, buf, 4)) |
| 1285 | return 0; |
| 1286 | op = extract_unsigned_integer (buf, 4); |
| 1287 | |
| 1288 | return op; |
| 1289 | } |
| 1290 | |
| 1291 | /* GCC generates several well-known sequences of instructions at the begining |
| 1292 | of each function prologue when compiling with -fstack-check. If one of |
| 1293 | such sequences starts at START_PC, then return the address of the |
| 1294 | instruction immediately past this sequence. Otherwise, return START_PC. */ |
| 1295 | |
| 1296 | static CORE_ADDR |
| 1297 | rs6000_skip_stack_check (const CORE_ADDR start_pc) |
| 1298 | { |
| 1299 | CORE_ADDR pc = start_pc; |
| 1300 | unsigned long op = rs6000_fetch_instruction (pc); |
| 1301 | |
| 1302 | /* First possible sequence: A small number of probes. |
| 1303 | stw 0, -<some immediate>(1) |
| 1304 | [repeat this instruction any (small) number of times] |
| 1305 | */ |
| 1306 | |
| 1307 | if ((op & 0xffff0000) == 0x90010000) |
| 1308 | { |
| 1309 | while ((op & 0xffff0000) == 0x90010000) |
| 1310 | { |
| 1311 | pc = pc + 4; |
| 1312 | op = rs6000_fetch_instruction (pc); |
| 1313 | } |
| 1314 | return pc; |
| 1315 | } |
| 1316 | |
| 1317 | /* Second sequence: A probing loop. |
| 1318 | addi 12,1,-<some immediate> |
| 1319 | lis 0,-<some immediate> |
| 1320 | [possibly ori 0,0,<some immediate>] |
| 1321 | add 0,12,0 |
| 1322 | cmpw 0,12,0 |
| 1323 | beq 0,<disp> |
| 1324 | addi 12,12,-<some immediate> |
| 1325 | stw 0,0(12) |
| 1326 | b <disp> |
| 1327 | [possibly one last probe: stw 0,<some immediate>(12)] |
| 1328 | */ |
| 1329 | |
| 1330 | while (1) |
| 1331 | { |
| 1332 | /* addi 12,1,-<some immediate> */ |
| 1333 | if ((op & 0xffff0000) != 0x39810000) |
| 1334 | break; |
| 1335 | |
| 1336 | /* lis 0,-<some immediate> */ |
| 1337 | pc = pc + 4; |
| 1338 | op = rs6000_fetch_instruction (pc); |
| 1339 | if ((op & 0xffff0000) != 0x3c000000) |
| 1340 | break; |
| 1341 | |
| 1342 | pc = pc + 4; |
| 1343 | op = rs6000_fetch_instruction (pc); |
| 1344 | /* [possibly ori 0,0,<some immediate>] */ |
| 1345 | if ((op & 0xffff0000) == 0x60000000) |
| 1346 | { |
| 1347 | pc = pc + 4; |
| 1348 | op = rs6000_fetch_instruction (pc); |
| 1349 | } |
| 1350 | /* add 0,12,0 */ |
| 1351 | if (op != 0x7c0c0214) |
| 1352 | break; |
| 1353 | |
| 1354 | /* cmpw 0,12,0 */ |
| 1355 | pc = pc + 4; |
| 1356 | op = rs6000_fetch_instruction (pc); |
| 1357 | if (op != 0x7c0c0000) |
| 1358 | break; |
| 1359 | |
| 1360 | /* beq 0,<disp> */ |
| 1361 | pc = pc + 4; |
| 1362 | op = rs6000_fetch_instruction (pc); |
| 1363 | if ((op & 0xff9f0001) != 0x41820000) |
| 1364 | break; |
| 1365 | |
| 1366 | /* addi 12,12,-<some immediate> */ |
| 1367 | pc = pc + 4; |
| 1368 | op = rs6000_fetch_instruction (pc); |
| 1369 | if ((op & 0xffff0000) != 0x398c0000) |
| 1370 | break; |
| 1371 | |
| 1372 | /* stw 0,0(12) */ |
| 1373 | pc = pc + 4; |
| 1374 | op = rs6000_fetch_instruction (pc); |
| 1375 | if (op != 0x900c0000) |
| 1376 | break; |
| 1377 | |
| 1378 | /* b <disp> */ |
| 1379 | pc = pc + 4; |
| 1380 | op = rs6000_fetch_instruction (pc); |
| 1381 | if ((op & 0xfc000001) != 0x48000000) |
| 1382 | break; |
| 1383 | |
| 1384 | /* [possibly one last probe: stw 0,<some immediate>(12)] */ |
| 1385 | pc = pc + 4; |
| 1386 | op = rs6000_fetch_instruction (pc); |
| 1387 | if ((op & 0xffff0000) == 0x900c0000) |
| 1388 | { |
| 1389 | pc = pc + 4; |
| 1390 | op = rs6000_fetch_instruction (pc); |
| 1391 | } |
| 1392 | |
| 1393 | /* We found a valid stack-check sequence, return the new PC. */ |
| 1394 | return pc; |
| 1395 | } |
| 1396 | |
| 1397 | /* Third sequence: No probe; instead, a comparizon between the stack size |
| 1398 | limit (saved in a run-time global variable) and the current stack |
| 1399 | pointer: |
| 1400 | |
| 1401 | addi 0,1,-<some immediate> |
| 1402 | lis 12,__gnat_stack_limit@ha |
| 1403 | lwz 12,__gnat_stack_limit@l(12) |
| 1404 | twllt 0,12 |
| 1405 | |
| 1406 | or, with a small variant in the case of a bigger stack frame: |
| 1407 | addis 0,1,<some immediate> |
| 1408 | addic 0,0,-<some immediate> |
| 1409 | lis 12,__gnat_stack_limit@ha |
| 1410 | lwz 12,__gnat_stack_limit@l(12) |
| 1411 | twllt 0,12 |
| 1412 | */ |
| 1413 | while (1) |
| 1414 | { |
| 1415 | /* addi 0,1,-<some immediate> */ |
| 1416 | if ((op & 0xffff0000) != 0x38010000) |
| 1417 | { |
| 1418 | /* small stack frame variant not recognized; try the |
| 1419 | big stack frame variant: */ |
| 1420 | |
| 1421 | /* addis 0,1,<some immediate> */ |
| 1422 | if ((op & 0xffff0000) != 0x3c010000) |
| 1423 | break; |
| 1424 | |
| 1425 | /* addic 0,0,-<some immediate> */ |
| 1426 | pc = pc + 4; |
| 1427 | op = rs6000_fetch_instruction (pc); |
| 1428 | if ((op & 0xffff0000) != 0x30000000) |
| 1429 | break; |
| 1430 | } |
| 1431 | |
| 1432 | /* lis 12,<some immediate> */ |
| 1433 | pc = pc + 4; |
| 1434 | op = rs6000_fetch_instruction (pc); |
| 1435 | if ((op & 0xffff0000) != 0x3d800000) |
| 1436 | break; |
| 1437 | |
| 1438 | /* lwz 12,<some immediate>(12) */ |
| 1439 | pc = pc + 4; |
| 1440 | op = rs6000_fetch_instruction (pc); |
| 1441 | if ((op & 0xffff0000) != 0x818c0000) |
| 1442 | break; |
| 1443 | |
| 1444 | /* twllt 0,12 */ |
| 1445 | pc = pc + 4; |
| 1446 | op = rs6000_fetch_instruction (pc); |
| 1447 | if ((op & 0xfffffffe) != 0x7c406008) |
| 1448 | break; |
| 1449 | |
| 1450 | /* We found a valid stack-check sequence, return the new PC. */ |
| 1451 | return pc; |
| 1452 | } |
| 1453 | |
| 1454 | /* No stack check code in our prologue, return the start_pc. */ |
| 1455 | return start_pc; |
| 1456 | } |
| 1457 | |
| 1458 | /* return pc value after skipping a function prologue and also return |
| 1459 | information about a function frame. |
| 1460 | |
| 1461 | in struct rs6000_framedata fdata: |
| 1462 | - frameless is TRUE, if function does not have a frame. |
| 1463 | - nosavedpc is TRUE, if function does not save %pc value in its frame. |
| 1464 | - offset is the initial size of this stack frame --- the amount by |
| 1465 | which we decrement the sp to allocate the frame. |
| 1466 | - saved_gpr is the number of the first saved gpr. |
| 1467 | - saved_fpr is the number of the first saved fpr. |
| 1468 | - saved_vr is the number of the first saved vr. |
| 1469 | - saved_ev is the number of the first saved ev. |
| 1470 | - alloca_reg is the number of the register used for alloca() handling. |
| 1471 | Otherwise -1. |
| 1472 | - gpr_offset is the offset of the first saved gpr from the previous frame. |
| 1473 | - fpr_offset is the offset of the first saved fpr from the previous frame. |
| 1474 | - vr_offset is the offset of the first saved vr from the previous frame. |
| 1475 | - ev_offset is the offset of the first saved ev from the previous frame. |
| 1476 | - lr_offset is the offset of the saved lr |
| 1477 | - cr_offset is the offset of the saved cr |
| 1478 | - vrsave_offset is the offset of the saved vrsave register |
| 1479 | */ |
| 1480 | |
| 1481 | static CORE_ADDR |
| 1482 | skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc, |
| 1483 | struct rs6000_framedata *fdata) |
| 1484 | { |
| 1485 | CORE_ADDR orig_pc = pc; |
| 1486 | CORE_ADDR last_prologue_pc = pc; |
| 1487 | CORE_ADDR li_found_pc = 0; |
| 1488 | gdb_byte buf[4]; |
| 1489 | unsigned long op; |
| 1490 | long offset = 0; |
| 1491 | long vr_saved_offset = 0; |
| 1492 | int lr_reg = -1; |
| 1493 | int cr_reg = -1; |
| 1494 | int vr_reg = -1; |
| 1495 | int ev_reg = -1; |
| 1496 | long ev_offset = 0; |
| 1497 | int vrsave_reg = -1; |
| 1498 | int reg; |
| 1499 | int framep = 0; |
| 1500 | int minimal_toc_loaded = 0; |
| 1501 | int prev_insn_was_prologue_insn = 1; |
| 1502 | int num_skip_non_prologue_insns = 0; |
| 1503 | int r0_contains_arg = 0; |
| 1504 | const struct bfd_arch_info *arch_info = gdbarch_bfd_arch_info (gdbarch); |
| 1505 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1506 | |
| 1507 | memset (fdata, 0, sizeof (struct rs6000_framedata)); |
| 1508 | fdata->saved_gpr = -1; |
| 1509 | fdata->saved_fpr = -1; |
| 1510 | fdata->saved_vr = -1; |
| 1511 | fdata->saved_ev = -1; |
| 1512 | fdata->alloca_reg = -1; |
| 1513 | fdata->frameless = 1; |
| 1514 | fdata->nosavedpc = 1; |
| 1515 | fdata->lr_register = -1; |
| 1516 | |
| 1517 | pc = rs6000_skip_stack_check (pc); |
| 1518 | if (pc >= lim_pc) |
| 1519 | pc = lim_pc; |
| 1520 | |
| 1521 | for (;; pc += 4) |
| 1522 | { |
| 1523 | /* Sometimes it isn't clear if an instruction is a prologue |
| 1524 | instruction or not. When we encounter one of these ambiguous |
| 1525 | cases, we'll set prev_insn_was_prologue_insn to 0 (false). |
| 1526 | Otherwise, we'll assume that it really is a prologue instruction. */ |
| 1527 | if (prev_insn_was_prologue_insn) |
| 1528 | last_prologue_pc = pc; |
| 1529 | |
| 1530 | /* Stop scanning if we've hit the limit. */ |
| 1531 | if (pc >= lim_pc) |
| 1532 | break; |
| 1533 | |
| 1534 | prev_insn_was_prologue_insn = 1; |
| 1535 | |
| 1536 | /* Fetch the instruction and convert it to an integer. */ |
| 1537 | if (target_read_memory (pc, buf, 4)) |
| 1538 | break; |
| 1539 | op = extract_unsigned_integer (buf, 4); |
| 1540 | |
| 1541 | if ((op & 0xfc1fffff) == 0x7c0802a6) |
| 1542 | { /* mflr Rx */ |
| 1543 | /* Since shared library / PIC code, which needs to get its |
| 1544 | address at runtime, can appear to save more than one link |
| 1545 | register vis: |
| 1546 | |
| 1547 | *INDENT-OFF* |
| 1548 | stwu r1,-304(r1) |
| 1549 | mflr r3 |
| 1550 | bl 0xff570d0 (blrl) |
| 1551 | stw r30,296(r1) |
| 1552 | mflr r30 |
| 1553 | stw r31,300(r1) |
| 1554 | stw r3,308(r1); |
| 1555 | ... |
| 1556 | *INDENT-ON* |
| 1557 | |
| 1558 | remember just the first one, but skip over additional |
| 1559 | ones. */ |
| 1560 | if (lr_reg == -1) |
| 1561 | lr_reg = (op & 0x03e00000) >> 21; |
| 1562 | if (lr_reg == 0) |
| 1563 | r0_contains_arg = 0; |
| 1564 | continue; |
| 1565 | } |
| 1566 | else if ((op & 0xfc1fffff) == 0x7c000026) |
| 1567 | { /* mfcr Rx */ |
| 1568 | cr_reg = (op & 0x03e00000); |
| 1569 | if (cr_reg == 0) |
| 1570 | r0_contains_arg = 0; |
| 1571 | continue; |
| 1572 | |
| 1573 | } |
| 1574 | else if ((op & 0xfc1f0000) == 0xd8010000) |
| 1575 | { /* stfd Rx,NUM(r1) */ |
| 1576 | reg = GET_SRC_REG (op); |
| 1577 | if (fdata->saved_fpr == -1 || fdata->saved_fpr > reg) |
| 1578 | { |
| 1579 | fdata->saved_fpr = reg; |
| 1580 | fdata->fpr_offset = SIGNED_SHORT (op) + offset; |
| 1581 | } |
| 1582 | continue; |
| 1583 | |
| 1584 | } |
| 1585 | else if (((op & 0xfc1f0000) == 0xbc010000) || /* stm Rx, NUM(r1) */ |
| 1586 | (((op & 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */ |
| 1587 | (op & 0xfc1f0003) == 0xf8010000) && /* std rx,NUM(r1) */ |
| 1588 | (op & 0x03e00000) >= 0x01a00000)) /* rx >= r13 */ |
| 1589 | { |
| 1590 | |
| 1591 | reg = GET_SRC_REG (op); |
| 1592 | if ((op & 0xfc1f0000) == 0xbc010000) |
| 1593 | fdata->gpr_mask |= ~((1U << reg) - 1); |
| 1594 | else |
| 1595 | fdata->gpr_mask |= 1U << reg; |
| 1596 | if (fdata->saved_gpr == -1 || fdata->saved_gpr > reg) |
| 1597 | { |
| 1598 | fdata->saved_gpr = reg; |
| 1599 | if ((op & 0xfc1f0003) == 0xf8010000) |
| 1600 | op &= ~3UL; |
| 1601 | fdata->gpr_offset = SIGNED_SHORT (op) + offset; |
| 1602 | } |
| 1603 | continue; |
| 1604 | |
| 1605 | } |
| 1606 | else if ((op & 0xffff0000) == 0x60000000) |
| 1607 | { |
| 1608 | /* nop */ |
| 1609 | /* Allow nops in the prologue, but do not consider them to |
| 1610 | be part of the prologue unless followed by other prologue |
| 1611 | instructions. */ |
| 1612 | prev_insn_was_prologue_insn = 0; |
| 1613 | continue; |
| 1614 | |
| 1615 | } |
| 1616 | else if ((op & 0xffff0000) == 0x3c000000) |
| 1617 | { /* addis 0,0,NUM, used |
| 1618 | for >= 32k frames */ |
| 1619 | fdata->offset = (op & 0x0000ffff) << 16; |
| 1620 | fdata->frameless = 0; |
| 1621 | r0_contains_arg = 0; |
| 1622 | continue; |
| 1623 | |
| 1624 | } |
| 1625 | else if ((op & 0xffff0000) == 0x60000000) |
| 1626 | { /* ori 0,0,NUM, 2nd ha |
| 1627 | lf of >= 32k frames */ |
| 1628 | fdata->offset |= (op & 0x0000ffff); |
| 1629 | fdata->frameless = 0; |
| 1630 | r0_contains_arg = 0; |
| 1631 | continue; |
| 1632 | |
| 1633 | } |
| 1634 | else if (lr_reg >= 0 && |
| 1635 | /* std Rx, NUM(r1) || stdu Rx, NUM(r1) */ |
| 1636 | (((op & 0xffff0000) == (lr_reg | 0xf8010000)) || |
| 1637 | /* stw Rx, NUM(r1) */ |
| 1638 | ((op & 0xffff0000) == (lr_reg | 0x90010000)) || |
| 1639 | /* stwu Rx, NUM(r1) */ |
| 1640 | ((op & 0xffff0000) == (lr_reg | 0x94010000)))) |
| 1641 | { /* where Rx == lr */ |
| 1642 | fdata->lr_offset = offset; |
| 1643 | fdata->nosavedpc = 0; |
| 1644 | /* Invalidate lr_reg, but don't set it to -1. |
| 1645 | That would mean that it had never been set. */ |
| 1646 | lr_reg = -2; |
| 1647 | if ((op & 0xfc000003) == 0xf8000000 || /* std */ |
| 1648 | (op & 0xfc000000) == 0x90000000) /* stw */ |
| 1649 | { |
| 1650 | /* Does not update r1, so add displacement to lr_offset. */ |
| 1651 | fdata->lr_offset += SIGNED_SHORT (op); |
| 1652 | } |
| 1653 | continue; |
| 1654 | |
| 1655 | } |
| 1656 | else if (cr_reg >= 0 && |
| 1657 | /* std Rx, NUM(r1) || stdu Rx, NUM(r1) */ |
| 1658 | (((op & 0xffff0000) == (cr_reg | 0xf8010000)) || |
| 1659 | /* stw Rx, NUM(r1) */ |
| 1660 | ((op & 0xffff0000) == (cr_reg | 0x90010000)) || |
| 1661 | /* stwu Rx, NUM(r1) */ |
| 1662 | ((op & 0xffff0000) == (cr_reg | 0x94010000)))) |
| 1663 | { /* where Rx == cr */ |
| 1664 | fdata->cr_offset = offset; |
| 1665 | /* Invalidate cr_reg, but don't set it to -1. |
| 1666 | That would mean that it had never been set. */ |
| 1667 | cr_reg = -2; |
| 1668 | if ((op & 0xfc000003) == 0xf8000000 || |
| 1669 | (op & 0xfc000000) == 0x90000000) |
| 1670 | { |
| 1671 | /* Does not update r1, so add displacement to cr_offset. */ |
| 1672 | fdata->cr_offset += SIGNED_SHORT (op); |
| 1673 | } |
| 1674 | continue; |
| 1675 | |
| 1676 | } |
| 1677 | else if ((op & 0xfe80ffff) == 0x42800005 && lr_reg != -1) |
| 1678 | { |
| 1679 | /* bcl 20,xx,.+4 is used to get the current PC, with or without |
| 1680 | prediction bits. If the LR has already been saved, we can |
| 1681 | skip it. */ |
| 1682 | continue; |
| 1683 | } |
| 1684 | else if (op == 0x48000005) |
| 1685 | { /* bl .+4 used in |
| 1686 | -mrelocatable */ |
| 1687 | fdata->used_bl = 1; |
| 1688 | continue; |
| 1689 | |
| 1690 | } |
| 1691 | else if (op == 0x48000004) |
| 1692 | { /* b .+4 (xlc) */ |
| 1693 | break; |
| 1694 | |
| 1695 | } |
| 1696 | else if ((op & 0xffff0000) == 0x3fc00000 || /* addis 30,0,foo@ha, used |
| 1697 | in V.4 -mminimal-toc */ |
| 1698 | (op & 0xffff0000) == 0x3bde0000) |
| 1699 | { /* addi 30,30,foo@l */ |
| 1700 | continue; |
| 1701 | |
| 1702 | } |
| 1703 | else if ((op & 0xfc000001) == 0x48000001) |
| 1704 | { /* bl foo, |
| 1705 | to save fprs??? */ |
| 1706 | |
| 1707 | fdata->frameless = 0; |
| 1708 | |
| 1709 | /* If the return address has already been saved, we can skip |
| 1710 | calls to blrl (for PIC). */ |
| 1711 | if (lr_reg != -1 && bl_to_blrl_insn_p (pc, op)) |
| 1712 | { |
| 1713 | fdata->used_bl = 1; |
| 1714 | continue; |
| 1715 | } |
| 1716 | |
| 1717 | /* Don't skip over the subroutine call if it is not within |
| 1718 | the first three instructions of the prologue and either |
| 1719 | we have no line table information or the line info tells |
| 1720 | us that the subroutine call is not part of the line |
| 1721 | associated with the prologue. */ |
| 1722 | if ((pc - orig_pc) > 8) |
| 1723 | { |
| 1724 | struct symtab_and_line prologue_sal = find_pc_line (orig_pc, 0); |
| 1725 | struct symtab_and_line this_sal = find_pc_line (pc, 0); |
| 1726 | |
| 1727 | if ((prologue_sal.line == 0) || (prologue_sal.line != this_sal.line)) |
| 1728 | break; |
| 1729 | } |
| 1730 | |
| 1731 | op = read_memory_integer (pc + 4, 4); |
| 1732 | |
| 1733 | /* At this point, make sure this is not a trampoline |
| 1734 | function (a function that simply calls another functions, |
| 1735 | and nothing else). If the next is not a nop, this branch |
| 1736 | was part of the function prologue. */ |
| 1737 | |
| 1738 | if (op == 0x4def7b82 || op == 0) /* crorc 15, 15, 15 */ |
| 1739 | break; /* don't skip over |
| 1740 | this branch */ |
| 1741 | |
| 1742 | fdata->used_bl = 1; |
| 1743 | continue; |
| 1744 | } |
| 1745 | /* update stack pointer */ |
| 1746 | else if ((op & 0xfc1f0000) == 0x94010000) |
| 1747 | { /* stu rX,NUM(r1) || stwu rX,NUM(r1) */ |
| 1748 | fdata->frameless = 0; |
| 1749 | fdata->offset = SIGNED_SHORT (op); |
| 1750 | offset = fdata->offset; |
| 1751 | continue; |
| 1752 | } |
| 1753 | else if ((op & 0xfc1f016a) == 0x7c01016e) |
| 1754 | { /* stwux rX,r1,rY */ |
| 1755 | /* no way to figure out what r1 is going to be */ |
| 1756 | fdata->frameless = 0; |
| 1757 | offset = fdata->offset; |
| 1758 | continue; |
| 1759 | } |
| 1760 | else if ((op & 0xfc1f0003) == 0xf8010001) |
| 1761 | { /* stdu rX,NUM(r1) */ |
| 1762 | fdata->frameless = 0; |
| 1763 | fdata->offset = SIGNED_SHORT (op & ~3UL); |
| 1764 | offset = fdata->offset; |
| 1765 | continue; |
| 1766 | } |
| 1767 | else if ((op & 0xfc1f016a) == 0x7c01016a) |
| 1768 | { /* stdux rX,r1,rY */ |
| 1769 | /* no way to figure out what r1 is going to be */ |
| 1770 | fdata->frameless = 0; |
| 1771 | offset = fdata->offset; |
| 1772 | continue; |
| 1773 | } |
| 1774 | else if ((op & 0xffff0000) == 0x38210000) |
| 1775 | { /* addi r1,r1,SIMM */ |
| 1776 | fdata->frameless = 0; |
| 1777 | fdata->offset += SIGNED_SHORT (op); |
| 1778 | offset = fdata->offset; |
| 1779 | continue; |
| 1780 | } |
| 1781 | /* Load up minimal toc pointer. Do not treat an epilogue restore |
| 1782 | of r31 as a minimal TOC load. */ |
| 1783 | else if (((op >> 22) == 0x20f || /* l r31,... or l r30,... */ |
| 1784 | (op >> 22) == 0x3af) /* ld r31,... or ld r30,... */ |
| 1785 | && !framep |
| 1786 | && !minimal_toc_loaded) |
| 1787 | { |
| 1788 | minimal_toc_loaded = 1; |
| 1789 | continue; |
| 1790 | |
| 1791 | /* move parameters from argument registers to local variable |
| 1792 | registers */ |
| 1793 | } |
| 1794 | else if ((op & 0xfc0007fe) == 0x7c000378 && /* mr(.) Rx,Ry */ |
| 1795 | (((op >> 21) & 31) >= 3) && /* R3 >= Ry >= R10 */ |
| 1796 | (((op >> 21) & 31) <= 10) && |
| 1797 | ((long) ((op >> 16) & 31) >= fdata->saved_gpr)) /* Rx: local var reg */ |
| 1798 | { |
| 1799 | continue; |
| 1800 | |
| 1801 | /* store parameters in stack */ |
| 1802 | } |
| 1803 | /* Move parameters from argument registers to temporary register. */ |
| 1804 | else if (store_param_on_stack_p (op, framep, &r0_contains_arg)) |
| 1805 | { |
| 1806 | continue; |
| 1807 | |
| 1808 | /* Set up frame pointer */ |
| 1809 | } |
| 1810 | else if (op == 0x603f0000 /* oril r31, r1, 0x0 */ |
| 1811 | || op == 0x7c3f0b78) |
| 1812 | { /* mr r31, r1 */ |
| 1813 | fdata->frameless = 0; |
| 1814 | framep = 1; |
| 1815 | fdata->alloca_reg = (tdep->ppc_gp0_regnum + 31); |
| 1816 | continue; |
| 1817 | |
| 1818 | /* Another way to set up the frame pointer. */ |
| 1819 | } |
| 1820 | else if ((op & 0xfc1fffff) == 0x38010000) |
| 1821 | { /* addi rX, r1, 0x0 */ |
| 1822 | fdata->frameless = 0; |
| 1823 | framep = 1; |
| 1824 | fdata->alloca_reg = (tdep->ppc_gp0_regnum |
| 1825 | + ((op & ~0x38010000) >> 21)); |
| 1826 | continue; |
| 1827 | } |
| 1828 | /* AltiVec related instructions. */ |
| 1829 | /* Store the vrsave register (spr 256) in another register for |
| 1830 | later manipulation, or load a register into the vrsave |
| 1831 | register. 2 instructions are used: mfvrsave and |
| 1832 | mtvrsave. They are shorthand notation for mfspr Rn, SPR256 |
| 1833 | and mtspr SPR256, Rn. */ |
| 1834 | /* mfspr Rn SPR256 == 011111 nnnnn 0000001000 01010100110 |
| 1835 | mtspr SPR256 Rn == 011111 nnnnn 0000001000 01110100110 */ |
| 1836 | else if ((op & 0xfc1fffff) == 0x7c0042a6) /* mfvrsave Rn */ |
| 1837 | { |
| 1838 | vrsave_reg = GET_SRC_REG (op); |
| 1839 | continue; |
| 1840 | } |
| 1841 | else if ((op & 0xfc1fffff) == 0x7c0043a6) /* mtvrsave Rn */ |
| 1842 | { |
| 1843 | continue; |
| 1844 | } |
| 1845 | /* Store the register where vrsave was saved to onto the stack: |
| 1846 | rS is the register where vrsave was stored in a previous |
| 1847 | instruction. */ |
| 1848 | /* 100100 sssss 00001 dddddddd dddddddd */ |
| 1849 | else if ((op & 0xfc1f0000) == 0x90010000) /* stw rS, d(r1) */ |
| 1850 | { |
| 1851 | if (vrsave_reg == GET_SRC_REG (op)) |
| 1852 | { |
| 1853 | fdata->vrsave_offset = SIGNED_SHORT (op) + offset; |
| 1854 | vrsave_reg = -1; |
| 1855 | } |
| 1856 | continue; |
| 1857 | } |
| 1858 | /* Compute the new value of vrsave, by modifying the register |
| 1859 | where vrsave was saved to. */ |
| 1860 | else if (((op & 0xfc000000) == 0x64000000) /* oris Ra, Rs, UIMM */ |
| 1861 | || ((op & 0xfc000000) == 0x60000000))/* ori Ra, Rs, UIMM */ |
| 1862 | { |
| 1863 | continue; |
| 1864 | } |
| 1865 | /* li r0, SIMM (short for addi r0, 0, SIMM). This is the first |
| 1866 | in a pair of insns to save the vector registers on the |
| 1867 | stack. */ |
| 1868 | /* 001110 00000 00000 iiii iiii iiii iiii */ |
| 1869 | /* 001110 01110 00000 iiii iiii iiii iiii */ |
| 1870 | else if ((op & 0xffff0000) == 0x38000000 /* li r0, SIMM */ |
| 1871 | || (op & 0xffff0000) == 0x39c00000) /* li r14, SIMM */ |
| 1872 | { |
| 1873 | if ((op & 0xffff0000) == 0x38000000) |
| 1874 | r0_contains_arg = 0; |
| 1875 | li_found_pc = pc; |
| 1876 | vr_saved_offset = SIGNED_SHORT (op); |
| 1877 | |
| 1878 | /* This insn by itself is not part of the prologue, unless |
| 1879 | if part of the pair of insns mentioned above. So do not |
| 1880 | record this insn as part of the prologue yet. */ |
| 1881 | prev_insn_was_prologue_insn = 0; |
| 1882 | } |
| 1883 | /* Store vector register S at (r31+r0) aligned to 16 bytes. */ |
| 1884 | /* 011111 sssss 11111 00000 00111001110 */ |
| 1885 | else if ((op & 0xfc1fffff) == 0x7c1f01ce) /* stvx Vs, R31, R0 */ |
| 1886 | { |
| 1887 | if (pc == (li_found_pc + 4)) |
| 1888 | { |
| 1889 | vr_reg = GET_SRC_REG (op); |
| 1890 | /* If this is the first vector reg to be saved, or if |
| 1891 | it has a lower number than others previously seen, |
| 1892 | reupdate the frame info. */ |
| 1893 | if (fdata->saved_vr == -1 || fdata->saved_vr > vr_reg) |
| 1894 | { |
| 1895 | fdata->saved_vr = vr_reg; |
| 1896 | fdata->vr_offset = vr_saved_offset + offset; |
| 1897 | } |
| 1898 | vr_saved_offset = -1; |
| 1899 | vr_reg = -1; |
| 1900 | li_found_pc = 0; |
| 1901 | } |
| 1902 | } |
| 1903 | /* End AltiVec related instructions. */ |
| 1904 | |
| 1905 | /* Start BookE related instructions. */ |
| 1906 | /* Store gen register S at (r31+uimm). |
| 1907 | Any register less than r13 is volatile, so we don't care. */ |
| 1908 | /* 000100 sssss 11111 iiiii 01100100001 */ |
| 1909 | else if (arch_info->mach == bfd_mach_ppc_e500 |
| 1910 | && (op & 0xfc1f07ff) == 0x101f0321) /* evstdd Rs,uimm(R31) */ |
| 1911 | { |
| 1912 | if ((op & 0x03e00000) >= 0x01a00000) /* Rs >= r13 */ |
| 1913 | { |
| 1914 | unsigned int imm; |
| 1915 | ev_reg = GET_SRC_REG (op); |
| 1916 | imm = (op >> 11) & 0x1f; |
| 1917 | ev_offset = imm * 8; |
| 1918 | /* If this is the first vector reg to be saved, or if |
| 1919 | it has a lower number than others previously seen, |
| 1920 | reupdate the frame info. */ |
| 1921 | if (fdata->saved_ev == -1 || fdata->saved_ev > ev_reg) |
| 1922 | { |
| 1923 | fdata->saved_ev = ev_reg; |
| 1924 | fdata->ev_offset = ev_offset + offset; |
| 1925 | } |
| 1926 | } |
| 1927 | continue; |
| 1928 | } |
| 1929 | /* Store gen register rS at (r1+rB). */ |
| 1930 | /* 000100 sssss 00001 bbbbb 01100100000 */ |
| 1931 | else if (arch_info->mach == bfd_mach_ppc_e500 |
| 1932 | && (op & 0xffe007ff) == 0x13e00320) /* evstddx RS,R1,Rb */ |
| 1933 | { |
| 1934 | if (pc == (li_found_pc + 4)) |
| 1935 | { |
| 1936 | ev_reg = GET_SRC_REG (op); |
| 1937 | /* If this is the first vector reg to be saved, or if |
| 1938 | it has a lower number than others previously seen, |
| 1939 | reupdate the frame info. */ |
| 1940 | /* We know the contents of rB from the previous instruction. */ |
| 1941 | if (fdata->saved_ev == -1 || fdata->saved_ev > ev_reg) |
| 1942 | { |
| 1943 | fdata->saved_ev = ev_reg; |
| 1944 | fdata->ev_offset = vr_saved_offset + offset; |
| 1945 | } |
| 1946 | vr_saved_offset = -1; |
| 1947 | ev_reg = -1; |
| 1948 | li_found_pc = 0; |
| 1949 | } |
| 1950 | continue; |
| 1951 | } |
| 1952 | /* Store gen register r31 at (rA+uimm). */ |
| 1953 | /* 000100 11111 aaaaa iiiii 01100100001 */ |
| 1954 | else if (arch_info->mach == bfd_mach_ppc_e500 |
| 1955 | && (op & 0xffe007ff) == 0x13e00321) /* evstdd R31,Ra,UIMM */ |
| 1956 | { |
| 1957 | /* Wwe know that the source register is 31 already, but |
| 1958 | it can't hurt to compute it. */ |
| 1959 | ev_reg = GET_SRC_REG (op); |
| 1960 | ev_offset = ((op >> 11) & 0x1f) * 8; |
| 1961 | /* If this is the first vector reg to be saved, or if |
| 1962 | it has a lower number than others previously seen, |
| 1963 | reupdate the frame info. */ |
| 1964 | if (fdata->saved_ev == -1 || fdata->saved_ev > ev_reg) |
| 1965 | { |
| 1966 | fdata->saved_ev = ev_reg; |
| 1967 | fdata->ev_offset = ev_offset + offset; |
| 1968 | } |
| 1969 | |
| 1970 | continue; |
| 1971 | } |
| 1972 | /* Store gen register S at (r31+r0). |
| 1973 | Store param on stack when offset from SP bigger than 4 bytes. */ |
| 1974 | /* 000100 sssss 11111 00000 01100100000 */ |
| 1975 | else if (arch_info->mach == bfd_mach_ppc_e500 |
| 1976 | && (op & 0xfc1fffff) == 0x101f0320) /* evstddx Rs,R31,R0 */ |
| 1977 | { |
| 1978 | if (pc == (li_found_pc + 4)) |
| 1979 | { |
| 1980 | if ((op & 0x03e00000) >= 0x01a00000) |
| 1981 | { |
| 1982 | ev_reg = GET_SRC_REG (op); |
| 1983 | /* If this is the first vector reg to be saved, or if |
| 1984 | it has a lower number than others previously seen, |
| 1985 | reupdate the frame info. */ |
| 1986 | /* We know the contents of r0 from the previous |
| 1987 | instruction. */ |
| 1988 | if (fdata->saved_ev == -1 || fdata->saved_ev > ev_reg) |
| 1989 | { |
| 1990 | fdata->saved_ev = ev_reg; |
| 1991 | fdata->ev_offset = vr_saved_offset + offset; |
| 1992 | } |
| 1993 | ev_reg = -1; |
| 1994 | } |
| 1995 | vr_saved_offset = -1; |
| 1996 | li_found_pc = 0; |
| 1997 | continue; |
| 1998 | } |
| 1999 | } |
| 2000 | /* End BookE related instructions. */ |
| 2001 | |
| 2002 | else |
| 2003 | { |
| 2004 | unsigned int all_mask = ~((1U << fdata->saved_gpr) - 1); |
| 2005 | |
| 2006 | /* Not a recognized prologue instruction. |
| 2007 | Handle optimizer code motions into the prologue by continuing |
| 2008 | the search if we have no valid frame yet or if the return |
| 2009 | address is not yet saved in the frame. Also skip instructions |
| 2010 | if some of the GPRs expected to be saved are not yet saved. */ |
| 2011 | if (fdata->frameless == 0 && fdata->nosavedpc == 0 |
| 2012 | && (fdata->gpr_mask & all_mask) == all_mask) |
| 2013 | break; |
| 2014 | |
| 2015 | if (op == 0x4e800020 /* blr */ |
| 2016 | || op == 0x4e800420) /* bctr */ |
| 2017 | /* Do not scan past epilogue in frameless functions or |
| 2018 | trampolines. */ |
| 2019 | break; |
| 2020 | if ((op & 0xf4000000) == 0x40000000) /* bxx */ |
| 2021 | /* Never skip branches. */ |
| 2022 | break; |
| 2023 | |
| 2024 | if (num_skip_non_prologue_insns++ > max_skip_non_prologue_insns) |
| 2025 | /* Do not scan too many insns, scanning insns is expensive with |
| 2026 | remote targets. */ |
| 2027 | break; |
| 2028 | |
| 2029 | /* Continue scanning. */ |
| 2030 | prev_insn_was_prologue_insn = 0; |
| 2031 | continue; |
| 2032 | } |
| 2033 | } |
| 2034 | |
| 2035 | #if 0 |
| 2036 | /* I have problems with skipping over __main() that I need to address |
| 2037 | * sometime. Previously, I used to use misc_function_vector which |
| 2038 | * didn't work as well as I wanted to be. -MGO */ |
| 2039 | |
| 2040 | /* If the first thing after skipping a prolog is a branch to a function, |
| 2041 | this might be a call to an initializer in main(), introduced by gcc2. |
| 2042 | We'd like to skip over it as well. Fortunately, xlc does some extra |
| 2043 | work before calling a function right after a prologue, thus we can |
| 2044 | single out such gcc2 behaviour. */ |
| 2045 | |
| 2046 | |
| 2047 | if ((op & 0xfc000001) == 0x48000001) |
| 2048 | { /* bl foo, an initializer function? */ |
| 2049 | op = read_memory_integer (pc + 4, 4); |
| 2050 | |
| 2051 | if (op == 0x4def7b82) |
| 2052 | { /* cror 0xf, 0xf, 0xf (nop) */ |
| 2053 | |
| 2054 | /* Check and see if we are in main. If so, skip over this |
| 2055 | initializer function as well. */ |
| 2056 | |
| 2057 | tmp = find_pc_misc_function (pc); |
| 2058 | if (tmp >= 0 |
| 2059 | && strcmp (misc_function_vector[tmp].name, main_name ()) == 0) |
| 2060 | return pc + 8; |
| 2061 | } |
| 2062 | } |
| 2063 | #endif /* 0 */ |
| 2064 | |
| 2065 | if (pc == lim_pc && lr_reg >= 0) |
| 2066 | fdata->lr_register = lr_reg; |
| 2067 | |
| 2068 | fdata->offset = -fdata->offset; |
| 2069 | return last_prologue_pc; |
| 2070 | } |
| 2071 | |
| 2072 | static CORE_ADDR |
| 2073 | rs6000_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 2074 | { |
| 2075 | struct rs6000_framedata frame; |
| 2076 | CORE_ADDR limit_pc, func_addr; |
| 2077 | |
| 2078 | /* See if we can determine the end of the prologue via the symbol table. |
| 2079 | If so, then return either PC, or the PC after the prologue, whichever |
| 2080 | is greater. */ |
| 2081 | if (find_pc_partial_function (pc, NULL, &func_addr, NULL)) |
| 2082 | { |
| 2083 | CORE_ADDR post_prologue_pc = skip_prologue_using_sal (func_addr); |
| 2084 | if (post_prologue_pc != 0) |
| 2085 | return max (pc, post_prologue_pc); |
| 2086 | } |
| 2087 | |
| 2088 | /* Can't determine prologue from the symbol table, need to examine |
| 2089 | instructions. */ |
| 2090 | |
| 2091 | /* Find an upper limit on the function prologue using the debug |
| 2092 | information. If the debug information could not be used to provide |
| 2093 | that bound, then use an arbitrary large number as the upper bound. */ |
| 2094 | limit_pc = skip_prologue_using_sal (pc); |
| 2095 | if (limit_pc == 0) |
| 2096 | limit_pc = pc + 100; /* Magic. */ |
| 2097 | |
| 2098 | pc = skip_prologue (gdbarch, pc, limit_pc, &frame); |
| 2099 | return pc; |
| 2100 | } |
| 2101 | |
| 2102 | /* When compiling for EABI, some versions of GCC emit a call to __eabi |
| 2103 | in the prologue of main(). |
| 2104 | |
| 2105 | The function below examines the code pointed at by PC and checks to |
| 2106 | see if it corresponds to a call to __eabi. If so, it returns the |
| 2107 | address of the instruction following that call. Otherwise, it simply |
| 2108 | returns PC. */ |
| 2109 | |
| 2110 | static CORE_ADDR |
| 2111 | rs6000_skip_main_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 2112 | { |
| 2113 | gdb_byte buf[4]; |
| 2114 | unsigned long op; |
| 2115 | |
| 2116 | if (target_read_memory (pc, buf, 4)) |
| 2117 | return pc; |
| 2118 | op = extract_unsigned_integer (buf, 4); |
| 2119 | |
| 2120 | if ((op & BL_MASK) == BL_INSTRUCTION) |
| 2121 | { |
| 2122 | CORE_ADDR displ = op & BL_DISPLACEMENT_MASK; |
| 2123 | CORE_ADDR call_dest = pc + 4 + displ; |
| 2124 | struct minimal_symbol *s = lookup_minimal_symbol_by_pc (call_dest); |
| 2125 | |
| 2126 | /* We check for ___eabi (three leading underscores) in addition |
| 2127 | to __eabi in case the GCC option "-fleading-underscore" was |
| 2128 | used to compile the program. */ |
| 2129 | if (s != NULL |
| 2130 | && SYMBOL_LINKAGE_NAME (s) != NULL |
| 2131 | && (strcmp (SYMBOL_LINKAGE_NAME (s), "__eabi") == 0 |
| 2132 | || strcmp (SYMBOL_LINKAGE_NAME (s), "___eabi") == 0)) |
| 2133 | pc += 4; |
| 2134 | } |
| 2135 | return pc; |
| 2136 | } |
| 2137 | |
| 2138 | /* All the ABI's require 16 byte alignment. */ |
| 2139 | static CORE_ADDR |
| 2140 | rs6000_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr) |
| 2141 | { |
| 2142 | return (addr & -16); |
| 2143 | } |
| 2144 | |
| 2145 | /* Return whether handle_inferior_event() should proceed through code |
| 2146 | starting at PC in function NAME when stepping. |
| 2147 | |
| 2148 | The AIX -bbigtoc linker option generates functions @FIX0, @FIX1, etc. to |
| 2149 | handle memory references that are too distant to fit in instructions |
| 2150 | generated by the compiler. For example, if 'foo' in the following |
| 2151 | instruction: |
| 2152 | |
| 2153 | lwz r9,foo(r2) |
| 2154 | |
| 2155 | is greater than 32767, the linker might replace the lwz with a branch to |
| 2156 | somewhere in @FIX1 that does the load in 2 instructions and then branches |
| 2157 | back to where execution should continue. |
| 2158 | |
| 2159 | GDB should silently step over @FIX code, just like AIX dbx does. |
| 2160 | Unfortunately, the linker uses the "b" instruction for the |
| 2161 | branches, meaning that the link register doesn't get set. |
| 2162 | Therefore, GDB's usual step_over_function () mechanism won't work. |
| 2163 | |
| 2164 | Instead, use the gdbarch_skip_trampoline_code and |
| 2165 | gdbarch_skip_trampoline_code hooks in handle_inferior_event() to skip past |
| 2166 | @FIX code. */ |
| 2167 | |
| 2168 | static int |
| 2169 | rs6000_in_solib_return_trampoline (CORE_ADDR pc, char *name) |
| 2170 | { |
| 2171 | return name && !strncmp (name, "@FIX", 4); |
| 2172 | } |
| 2173 | |
| 2174 | /* Skip code that the user doesn't want to see when stepping: |
| 2175 | |
| 2176 | 1. Indirect function calls use a piece of trampoline code to do context |
| 2177 | switching, i.e. to set the new TOC table. Skip such code if we are on |
| 2178 | its first instruction (as when we have single-stepped to here). |
| 2179 | |
| 2180 | 2. Skip shared library trampoline code (which is different from |
| 2181 | indirect function call trampolines). |
| 2182 | |
| 2183 | 3. Skip bigtoc fixup code. |
| 2184 | |
| 2185 | Result is desired PC to step until, or NULL if we are not in |
| 2186 | code that should be skipped. */ |
| 2187 | |
| 2188 | static CORE_ADDR |
| 2189 | rs6000_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
| 2190 | { |
| 2191 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (frame)); |
| 2192 | unsigned int ii, op; |
| 2193 | int rel; |
| 2194 | CORE_ADDR solib_target_pc; |
| 2195 | struct minimal_symbol *msymbol; |
| 2196 | |
| 2197 | static unsigned trampoline_code[] = |
| 2198 | { |
| 2199 | 0x800b0000, /* l r0,0x0(r11) */ |
| 2200 | 0x90410014, /* st r2,0x14(r1) */ |
| 2201 | 0x7c0903a6, /* mtctr r0 */ |
| 2202 | 0x804b0004, /* l r2,0x4(r11) */ |
| 2203 | 0x816b0008, /* l r11,0x8(r11) */ |
| 2204 | 0x4e800420, /* bctr */ |
| 2205 | 0x4e800020, /* br */ |
| 2206 | 0 |
| 2207 | }; |
| 2208 | |
| 2209 | /* Check for bigtoc fixup code. */ |
| 2210 | msymbol = lookup_minimal_symbol_by_pc (pc); |
| 2211 | if (msymbol |
| 2212 | && rs6000_in_solib_return_trampoline (pc, SYMBOL_LINKAGE_NAME (msymbol))) |
| 2213 | { |
| 2214 | /* Double-check that the third instruction from PC is relative "b". */ |
| 2215 | op = read_memory_integer (pc + 8, 4); |
| 2216 | if ((op & 0xfc000003) == 0x48000000) |
| 2217 | { |
| 2218 | /* Extract bits 6-29 as a signed 24-bit relative word address and |
| 2219 | add it to the containing PC. */ |
| 2220 | rel = ((int)(op << 6) >> 6); |
| 2221 | return pc + 8 + rel; |
| 2222 | } |
| 2223 | } |
| 2224 | |
| 2225 | /* If pc is in a shared library trampoline, return its target. */ |
| 2226 | solib_target_pc = find_solib_trampoline_target (frame, pc); |
| 2227 | if (solib_target_pc) |
| 2228 | return solib_target_pc; |
| 2229 | |
| 2230 | for (ii = 0; trampoline_code[ii]; ++ii) |
| 2231 | { |
| 2232 | op = read_memory_integer (pc + (ii * 4), 4); |
| 2233 | if (op != trampoline_code[ii]) |
| 2234 | return 0; |
| 2235 | } |
| 2236 | ii = get_frame_register_unsigned (frame, 11); /* r11 holds destination addr */ |
| 2237 | pc = read_memory_unsigned_integer (ii, tdep->wordsize); /* (r11) value */ |
| 2238 | return pc; |
| 2239 | } |
| 2240 | |
| 2241 | /* ISA-specific vector types. */ |
| 2242 | |
| 2243 | static struct type * |
| 2244 | rs6000_builtin_type_vec64 (struct gdbarch *gdbarch) |
| 2245 | { |
| 2246 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 2247 | |
| 2248 | if (!tdep->ppc_builtin_type_vec64) |
| 2249 | { |
| 2250 | /* The type we're building is this: */ |
| 2251 | #if 0 |
| 2252 | union __gdb_builtin_type_vec64 |
| 2253 | { |
| 2254 | int64_t uint64; |
| 2255 | float v2_float[2]; |
| 2256 | int32_t v2_int32[2]; |
| 2257 | int16_t v4_int16[4]; |
| 2258 | int8_t v8_int8[8]; |
| 2259 | }; |
| 2260 | #endif |
| 2261 | |
| 2262 | struct type *t; |
| 2263 | |
| 2264 | t = init_composite_type ("__ppc_builtin_type_vec64", TYPE_CODE_UNION); |
| 2265 | append_composite_type_field (t, "uint64", builtin_type_int64); |
| 2266 | append_composite_type_field (t, "v2_float", |
| 2267 | init_vector_type (builtin_type (gdbarch) |
| 2268 | ->builtin_float, 2)); |
| 2269 | append_composite_type_field (t, "v2_int32", |
| 2270 | init_vector_type (builtin_type_int32, 2)); |
| 2271 | append_composite_type_field (t, "v4_int16", |
| 2272 | init_vector_type (builtin_type_int16, 4)); |
| 2273 | append_composite_type_field (t, "v8_int8", |
| 2274 | init_vector_type (builtin_type_int8, 8)); |
| 2275 | |
| 2276 | TYPE_VECTOR (t) = 1; |
| 2277 | TYPE_NAME (t) = "ppc_builtin_type_vec64"; |
| 2278 | tdep->ppc_builtin_type_vec64 = t; |
| 2279 | } |
| 2280 | |
| 2281 | return tdep->ppc_builtin_type_vec64; |
| 2282 | } |
| 2283 | |
| 2284 | /* Vector 128 type. */ |
| 2285 | |
| 2286 | static struct type * |
| 2287 | rs6000_builtin_type_vec128 (struct gdbarch *gdbarch) |
| 2288 | { |
| 2289 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 2290 | |
| 2291 | if (!tdep->ppc_builtin_type_vec128) |
| 2292 | { |
| 2293 | /* The type we're building is this |
| 2294 | |
| 2295 | type = union __ppc_builtin_type_vec128 { |
| 2296 | uint128_t uint128; |
| 2297 | float v4_float[4]; |
| 2298 | int32_t v4_int32[4]; |
| 2299 | int16_t v8_int16[8]; |
| 2300 | int8_t v16_int8[16]; |
| 2301 | } |
| 2302 | */ |
| 2303 | |
| 2304 | struct type *t; |
| 2305 | |
| 2306 | t = init_composite_type ("__ppc_builtin_type_vec128", TYPE_CODE_UNION); |
| 2307 | append_composite_type_field (t, "uint128", builtin_type_uint128); |
| 2308 | append_composite_type_field (t, "v4_float", |
| 2309 | init_vector_type (builtin_type (gdbarch)->builtin_float, 4)); |
| 2310 | append_composite_type_field (t, "v4_int32", |
| 2311 | init_vector_type (builtin_type_int32, 4)); |
| 2312 | append_composite_type_field (t, "v8_int16", |
| 2313 | init_vector_type (builtin_type_int16, 8)); |
| 2314 | append_composite_type_field (t, "v16_int8", |
| 2315 | init_vector_type (builtin_type_int8, 16)); |
| 2316 | |
| 2317 | TYPE_VECTOR (t) = 1; |
| 2318 | TYPE_NAME (t) = "ppc_builtin_type_vec128"; |
| 2319 | tdep->ppc_builtin_type_vec128 = t; |
| 2320 | } |
| 2321 | |
| 2322 | return tdep->ppc_builtin_type_vec128; |
| 2323 | } |
| 2324 | |
| 2325 | /* Return the name of register number REGNO, or the empty string if it |
| 2326 | is an anonymous register. */ |
| 2327 | |
| 2328 | static const char * |
| 2329 | rs6000_register_name (struct gdbarch *gdbarch, int regno) |
| 2330 | { |
| 2331 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 2332 | |
| 2333 | /* The upper half "registers" have names in the XML description, |
| 2334 | but we present only the low GPRs and the full 64-bit registers |
| 2335 | to the user. */ |
| 2336 | if (tdep->ppc_ev0_upper_regnum >= 0 |
| 2337 | && tdep->ppc_ev0_upper_regnum <= regno |
| 2338 | && regno < tdep->ppc_ev0_upper_regnum + ppc_num_gprs) |
| 2339 | return ""; |
| 2340 | |
| 2341 | /* Hide the upper halves of the vs0~vs31 registers. */ |
| 2342 | if (tdep->ppc_vsr0_regnum >= 0 |
| 2343 | && tdep->ppc_vsr0_upper_regnum <= regno |
| 2344 | && regno < tdep->ppc_vsr0_upper_regnum + ppc_num_gprs) |
| 2345 | return ""; |
| 2346 | |
| 2347 | /* Check if the SPE pseudo registers are available. */ |
| 2348 | if (IS_SPE_PSEUDOREG (tdep, regno)) |
| 2349 | { |
| 2350 | static const char *const spe_regnames[] = { |
| 2351 | "ev0", "ev1", "ev2", "ev3", "ev4", "ev5", "ev6", "ev7", |
| 2352 | "ev8", "ev9", "ev10", "ev11", "ev12", "ev13", "ev14", "ev15", |
| 2353 | "ev16", "ev17", "ev18", "ev19", "ev20", "ev21", "ev22", "ev23", |
| 2354 | "ev24", "ev25", "ev26", "ev27", "ev28", "ev29", "ev30", "ev31", |
| 2355 | }; |
| 2356 | return spe_regnames[regno - tdep->ppc_ev0_regnum]; |
| 2357 | } |
| 2358 | |
| 2359 | /* Check if the decimal128 pseudo-registers are available. */ |
| 2360 | if (IS_DFP_PSEUDOREG (tdep, regno)) |
| 2361 | { |
| 2362 | static const char *const dfp128_regnames[] = { |
| 2363 | "dl0", "dl1", "dl2", "dl3", |
| 2364 | "dl4", "dl5", "dl6", "dl7", |
| 2365 | "dl8", "dl9", "dl10", "dl11", |
| 2366 | "dl12", "dl13", "dl14", "dl15" |
| 2367 | }; |
| 2368 | return dfp128_regnames[regno - tdep->ppc_dl0_regnum]; |
| 2369 | } |
| 2370 | |
| 2371 | /* Check if this is a VSX pseudo-register. */ |
| 2372 | if (IS_VSX_PSEUDOREG (tdep, regno)) |
| 2373 | { |
| 2374 | static const char *const vsx_regnames[] = { |
| 2375 | "vs0", "vs1", "vs2", "vs3", "vs4", "vs5", "vs6", "vs7", |
| 2376 | "vs8", "vs9", "vs10", "vs11", "vs12", "vs13", "vs14", |
| 2377 | "vs15", "vs16", "vs17", "vs18", "vs19", "vs20", "vs21", |
| 2378 | "vs22", "vs23", "vs24", "vs25", "vs26", "vs27", "vs28", |
| 2379 | "vs29", "vs30", "vs31", "vs32", "vs33", "vs34", "vs35", |
| 2380 | "vs36", "vs37", "vs38", "vs39", "vs40", "vs41", "vs42", |
| 2381 | "vs43", "vs44", "vs45", "vs46", "vs47", "vs48", "vs49", |
| 2382 | "vs50", "vs51", "vs52", "vs53", "vs54", "vs55", "vs56", |
| 2383 | "vs57", "vs58", "vs59", "vs60", "vs61", "vs62", "vs63" |
| 2384 | }; |
| 2385 | return vsx_regnames[regno - tdep->ppc_vsr0_regnum]; |
| 2386 | } |
| 2387 | |
| 2388 | /* Check if the this is a Extended FP pseudo-register. */ |
| 2389 | if (IS_EFP_PSEUDOREG (tdep, regno)) |
| 2390 | { |
| 2391 | static const char *const efpr_regnames[] = { |
| 2392 | "f32", "f33", "f34", "f35", "f36", "f37", "f38", |
| 2393 | "f39", "f40", "f41", "f42", "f43", "f44", "f45", |
| 2394 | "f46", "f47", "f48", "f49", "f50", "f51", |
| 2395 | "f52", "f53", "f54", "f55", "f56", "f57", |
| 2396 | "f58", "f59", "f60", "f61", "f62", "f63" |
| 2397 | }; |
| 2398 | return efpr_regnames[regno - tdep->ppc_efpr0_regnum]; |
| 2399 | } |
| 2400 | |
| 2401 | return tdesc_register_name (gdbarch, regno); |
| 2402 | } |
| 2403 | |
| 2404 | /* Return the GDB type object for the "standard" data type of data in |
| 2405 | register N. */ |
| 2406 | |
| 2407 | static struct type * |
| 2408 | rs6000_pseudo_register_type (struct gdbarch *gdbarch, int regnum) |
| 2409 | { |
| 2410 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 2411 | |
| 2412 | /* These are the only pseudo-registers we support. */ |
| 2413 | gdb_assert (IS_SPE_PSEUDOREG (tdep, regnum) |
| 2414 | || IS_DFP_PSEUDOREG (tdep, regnum) |
| 2415 | || IS_VSX_PSEUDOREG (tdep, regnum) |
| 2416 | || IS_EFP_PSEUDOREG (tdep, regnum)); |
| 2417 | |
| 2418 | /* These are the e500 pseudo-registers. */ |
| 2419 | if (IS_SPE_PSEUDOREG (tdep, regnum)) |
| 2420 | return rs6000_builtin_type_vec64 (gdbarch); |
| 2421 | else if (IS_DFP_PSEUDOREG (tdep, regnum)) |
| 2422 | /* PPC decimal128 pseudo-registers. */ |
| 2423 | return builtin_type (gdbarch)->builtin_declong; |
| 2424 | else if (IS_VSX_PSEUDOREG (tdep, regnum)) |
| 2425 | /* POWER7 VSX pseudo-registers. */ |
| 2426 | return rs6000_builtin_type_vec128 (gdbarch); |
| 2427 | else |
| 2428 | /* POWER7 Extended FP pseudo-registers. */ |
| 2429 | return builtin_type (gdbarch)->builtin_double; |
| 2430 | } |
| 2431 | |
| 2432 | /* Is REGNUM a member of REGGROUP? */ |
| 2433 | static int |
| 2434 | rs6000_pseudo_register_reggroup_p (struct gdbarch *gdbarch, int regnum, |
| 2435 | struct reggroup *group) |
| 2436 | { |
| 2437 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 2438 | |
| 2439 | /* These are the only pseudo-registers we support. */ |
| 2440 | gdb_assert (IS_SPE_PSEUDOREG (tdep, regnum) |
| 2441 | || IS_DFP_PSEUDOREG (tdep, regnum) |
| 2442 | || IS_VSX_PSEUDOREG (tdep, regnum) |
| 2443 | || IS_EFP_PSEUDOREG (tdep, regnum)); |
| 2444 | |
| 2445 | /* These are the e500 pseudo-registers or the POWER7 VSX registers. */ |
| 2446 | if (IS_SPE_PSEUDOREG (tdep, regnum) || IS_VSX_PSEUDOREG (tdep, regnum)) |
| 2447 | return group == all_reggroup || group == vector_reggroup; |
| 2448 | else |
| 2449 | /* PPC decimal128 or Extended FP pseudo-registers. */ |
| 2450 | return group == all_reggroup || group == float_reggroup; |
| 2451 | } |
| 2452 | |
| 2453 | /* The register format for RS/6000 floating point registers is always |
| 2454 | double, we need a conversion if the memory format is float. */ |
| 2455 | |
| 2456 | static int |
| 2457 | rs6000_convert_register_p (struct gdbarch *gdbarch, int regnum, |
| 2458 | struct type *type) |
| 2459 | { |
| 2460 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 2461 | |
| 2462 | return (tdep->ppc_fp0_regnum >= 0 |
| 2463 | && regnum >= tdep->ppc_fp0_regnum |
| 2464 | && regnum < tdep->ppc_fp0_regnum + ppc_num_fprs |
| 2465 | && TYPE_CODE (type) == TYPE_CODE_FLT |
| 2466 | && TYPE_LENGTH (type) |
| 2467 | != TYPE_LENGTH (builtin_type (gdbarch)->builtin_double)); |
| 2468 | } |
| 2469 | |
| 2470 | static void |
| 2471 | rs6000_register_to_value (struct frame_info *frame, |
| 2472 | int regnum, |
| 2473 | struct type *type, |
| 2474 | gdb_byte *to) |
| 2475 | { |
| 2476 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 2477 | gdb_byte from[MAX_REGISTER_SIZE]; |
| 2478 | |
| 2479 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_FLT); |
| 2480 | |
| 2481 | get_frame_register (frame, regnum, from); |
| 2482 | convert_typed_floating (from, builtin_type (gdbarch)->builtin_double, |
| 2483 | to, type); |
| 2484 | } |
| 2485 | |
| 2486 | static void |
| 2487 | rs6000_value_to_register (struct frame_info *frame, |
| 2488 | int regnum, |
| 2489 | struct type *type, |
| 2490 | const gdb_byte *from) |
| 2491 | { |
| 2492 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 2493 | gdb_byte to[MAX_REGISTER_SIZE]; |
| 2494 | |
| 2495 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_FLT); |
| 2496 | |
| 2497 | convert_typed_floating (from, type, |
| 2498 | to, builtin_type (gdbarch)->builtin_double); |
| 2499 | put_frame_register (frame, regnum, to); |
| 2500 | } |
| 2501 | |
| 2502 | /* Move SPE vector register values between a 64-bit buffer and the two |
| 2503 | 32-bit raw register halves in a regcache. This function handles |
| 2504 | both splitting a 64-bit value into two 32-bit halves, and joining |
| 2505 | two halves into a whole 64-bit value, depending on the function |
| 2506 | passed as the MOVE argument. |
| 2507 | |
| 2508 | EV_REG must be the number of an SPE evN vector register --- a |
| 2509 | pseudoregister. REGCACHE must be a regcache, and BUFFER must be a |
| 2510 | 64-bit buffer. |
| 2511 | |
| 2512 | Call MOVE once for each 32-bit half of that register, passing |
| 2513 | REGCACHE, the number of the raw register corresponding to that |
| 2514 | half, and the address of the appropriate half of BUFFER. |
| 2515 | |
| 2516 | For example, passing 'regcache_raw_read' as the MOVE function will |
| 2517 | fill BUFFER with the full 64-bit contents of EV_REG. Or, passing |
| 2518 | 'regcache_raw_supply' will supply the contents of BUFFER to the |
| 2519 | appropriate pair of raw registers in REGCACHE. |
| 2520 | |
| 2521 | You may need to cast away some 'const' qualifiers when passing |
| 2522 | MOVE, since this function can't tell at compile-time which of |
| 2523 | REGCACHE or BUFFER is acting as the source of the data. If C had |
| 2524 | co-variant type qualifiers, ... */ |
| 2525 | static void |
| 2526 | e500_move_ev_register (void (*move) (struct regcache *regcache, |
| 2527 | int regnum, gdb_byte *buf), |
| 2528 | struct regcache *regcache, int ev_reg, |
| 2529 | gdb_byte *buffer) |
| 2530 | { |
| 2531 | struct gdbarch *arch = get_regcache_arch (regcache); |
| 2532 | struct gdbarch_tdep *tdep = gdbarch_tdep (arch); |
| 2533 | int reg_index; |
| 2534 | gdb_byte *byte_buffer = buffer; |
| 2535 | |
| 2536 | gdb_assert (IS_SPE_PSEUDOREG (tdep, ev_reg)); |
| 2537 | |
| 2538 | reg_index = ev_reg - tdep->ppc_ev0_regnum; |
| 2539 | |
| 2540 | if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG) |
| 2541 | { |
| 2542 | move (regcache, tdep->ppc_ev0_upper_regnum + reg_index, byte_buffer); |
| 2543 | move (regcache, tdep->ppc_gp0_regnum + reg_index, byte_buffer + 4); |
| 2544 | } |
| 2545 | else |
| 2546 | { |
| 2547 | move (regcache, tdep->ppc_gp0_regnum + reg_index, byte_buffer); |
| 2548 | move (regcache, tdep->ppc_ev0_upper_regnum + reg_index, byte_buffer + 4); |
| 2549 | } |
| 2550 | } |
| 2551 | |
| 2552 | static void |
| 2553 | e500_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache, |
| 2554 | int reg_nr, gdb_byte *buffer) |
| 2555 | { |
| 2556 | e500_move_ev_register (regcache_raw_read, regcache, reg_nr, buffer); |
| 2557 | } |
| 2558 | |
| 2559 | static void |
| 2560 | e500_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache, |
| 2561 | int reg_nr, const gdb_byte *buffer) |
| 2562 | { |
| 2563 | e500_move_ev_register ((void (*) (struct regcache *, int, gdb_byte *)) |
| 2564 | regcache_raw_write, |
| 2565 | regcache, reg_nr, (gdb_byte *) buffer); |
| 2566 | } |
| 2567 | |
| 2568 | /* Read method for DFP pseudo-registers. */ |
| 2569 | static void |
| 2570 | dfp_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache, |
| 2571 | int reg_nr, gdb_byte *buffer) |
| 2572 | { |
| 2573 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 2574 | int reg_index = reg_nr - tdep->ppc_dl0_regnum; |
| 2575 | |
| 2576 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 2577 | { |
| 2578 | /* Read two FP registers to form a whole dl register. */ |
| 2579 | regcache_raw_read (regcache, tdep->ppc_fp0_regnum + |
| 2580 | 2 * reg_index, buffer); |
| 2581 | regcache_raw_read (regcache, tdep->ppc_fp0_regnum + |
| 2582 | 2 * reg_index + 1, buffer + 8); |
| 2583 | } |
| 2584 | else |
| 2585 | { |
| 2586 | regcache_raw_read (regcache, tdep->ppc_fp0_regnum + |
| 2587 | 2 * reg_index + 1, buffer + 8); |
| 2588 | regcache_raw_read (regcache, tdep->ppc_fp0_regnum + |
| 2589 | 2 * reg_index, buffer); |
| 2590 | } |
| 2591 | } |
| 2592 | |
| 2593 | /* Write method for DFP pseudo-registers. */ |
| 2594 | static void |
| 2595 | dfp_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache, |
| 2596 | int reg_nr, const gdb_byte *buffer) |
| 2597 | { |
| 2598 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 2599 | int reg_index = reg_nr - tdep->ppc_dl0_regnum; |
| 2600 | |
| 2601 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 2602 | { |
| 2603 | /* Write each half of the dl register into a separate |
| 2604 | FP register. */ |
| 2605 | regcache_raw_write (regcache, tdep->ppc_fp0_regnum + |
| 2606 | 2 * reg_index, buffer); |
| 2607 | regcache_raw_write (regcache, tdep->ppc_fp0_regnum + |
| 2608 | 2 * reg_index + 1, buffer + 8); |
| 2609 | } |
| 2610 | else |
| 2611 | { |
| 2612 | regcache_raw_write (regcache, tdep->ppc_fp0_regnum + |
| 2613 | 2 * reg_index + 1, buffer + 8); |
| 2614 | regcache_raw_write (regcache, tdep->ppc_fp0_regnum + |
| 2615 | 2 * reg_index, buffer); |
| 2616 | } |
| 2617 | } |
| 2618 | |
| 2619 | /* Read method for POWER7 VSX pseudo-registers. */ |
| 2620 | static void |
| 2621 | vsx_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache, |
| 2622 | int reg_nr, gdb_byte *buffer) |
| 2623 | { |
| 2624 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 2625 | int reg_index = reg_nr - tdep->ppc_vsr0_regnum; |
| 2626 | |
| 2627 | /* Read the portion that overlaps the VMX registers. */ |
| 2628 | if (reg_index > 31) |
| 2629 | regcache_raw_read (regcache, tdep->ppc_vr0_regnum + |
| 2630 | reg_index - 32, buffer); |
| 2631 | else |
| 2632 | /* Read the portion that overlaps the FPR registers. */ |
| 2633 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 2634 | { |
| 2635 | regcache_raw_read (regcache, tdep->ppc_fp0_regnum + |
| 2636 | reg_index, buffer); |
| 2637 | regcache_raw_read (regcache, tdep->ppc_vsr0_upper_regnum + |
| 2638 | reg_index, buffer + 8); |
| 2639 | } |
| 2640 | else |
| 2641 | { |
| 2642 | regcache_raw_read (regcache, tdep->ppc_fp0_regnum + |
| 2643 | reg_index, buffer + 8); |
| 2644 | regcache_raw_read (regcache, tdep->ppc_vsr0_upper_regnum + |
| 2645 | reg_index, buffer); |
| 2646 | } |
| 2647 | } |
| 2648 | |
| 2649 | /* Write method for POWER7 VSX pseudo-registers. */ |
| 2650 | static void |
| 2651 | vsx_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache, |
| 2652 | int reg_nr, const gdb_byte *buffer) |
| 2653 | { |
| 2654 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 2655 | int reg_index = reg_nr - tdep->ppc_vsr0_regnum; |
| 2656 | |
| 2657 | /* Write the portion that overlaps the VMX registers. */ |
| 2658 | if (reg_index > 31) |
| 2659 | regcache_raw_write (regcache, tdep->ppc_vr0_regnum + |
| 2660 | reg_index - 32, buffer); |
| 2661 | else |
| 2662 | /* Write the portion that overlaps the FPR registers. */ |
| 2663 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 2664 | { |
| 2665 | regcache_raw_write (regcache, tdep->ppc_fp0_regnum + |
| 2666 | reg_index, buffer); |
| 2667 | regcache_raw_write (regcache, tdep->ppc_vsr0_upper_regnum + |
| 2668 | reg_index, buffer + 8); |
| 2669 | } |
| 2670 | else |
| 2671 | { |
| 2672 | regcache_raw_write (regcache, tdep->ppc_fp0_regnum + |
| 2673 | reg_index, buffer + 8); |
| 2674 | regcache_raw_write (regcache, tdep->ppc_vsr0_upper_regnum + |
| 2675 | reg_index, buffer); |
| 2676 | } |
| 2677 | } |
| 2678 | |
| 2679 | /* Read method for POWER7 Extended FP pseudo-registers. */ |
| 2680 | static void |
| 2681 | efpr_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache, |
| 2682 | int reg_nr, gdb_byte *buffer) |
| 2683 | { |
| 2684 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 2685 | int reg_index = reg_nr - tdep->ppc_efpr0_regnum; |
| 2686 | |
| 2687 | /* Read the portion that overlaps the VMX registers. */ |
| 2688 | regcache_raw_read (regcache, tdep->ppc_vr0_regnum + |
| 2689 | reg_index, buffer); |
| 2690 | } |
| 2691 | |
| 2692 | /* Write method for POWER7 Extended FP pseudo-registers. */ |
| 2693 | static void |
| 2694 | efpr_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache, |
| 2695 | int reg_nr, const gdb_byte *buffer) |
| 2696 | { |
| 2697 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 2698 | int reg_index = reg_nr - tdep->ppc_efpr0_regnum; |
| 2699 | |
| 2700 | /* Write the portion that overlaps the VMX registers. */ |
| 2701 | regcache_raw_write (regcache, tdep->ppc_vr0_regnum + |
| 2702 | reg_index, buffer); |
| 2703 | } |
| 2704 | |
| 2705 | static void |
| 2706 | rs6000_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache, |
| 2707 | int reg_nr, gdb_byte *buffer) |
| 2708 | { |
| 2709 | struct gdbarch *regcache_arch = get_regcache_arch (regcache); |
| 2710 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 2711 | |
| 2712 | gdb_assert (regcache_arch == gdbarch); |
| 2713 | |
| 2714 | if (IS_SPE_PSEUDOREG (tdep, reg_nr)) |
| 2715 | e500_pseudo_register_read (gdbarch, regcache, reg_nr, buffer); |
| 2716 | else if (IS_DFP_PSEUDOREG (tdep, reg_nr)) |
| 2717 | dfp_pseudo_register_read (gdbarch, regcache, reg_nr, buffer); |
| 2718 | else if (IS_VSX_PSEUDOREG (tdep, reg_nr)) |
| 2719 | vsx_pseudo_register_read (gdbarch, regcache, reg_nr, buffer); |
| 2720 | else if (IS_EFP_PSEUDOREG (tdep, reg_nr)) |
| 2721 | efpr_pseudo_register_read (gdbarch, regcache, reg_nr, buffer); |
| 2722 | else |
| 2723 | internal_error (__FILE__, __LINE__, |
| 2724 | _("rs6000_pseudo_register_read: " |
| 2725 | "called on unexpected register '%s' (%d)"), |
| 2726 | gdbarch_register_name (gdbarch, reg_nr), reg_nr); |
| 2727 | } |
| 2728 | |
| 2729 | static void |
| 2730 | rs6000_pseudo_register_write (struct gdbarch *gdbarch, |
| 2731 | struct regcache *regcache, |
| 2732 | int reg_nr, const gdb_byte *buffer) |
| 2733 | { |
| 2734 | struct gdbarch *regcache_arch = get_regcache_arch (regcache); |
| 2735 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 2736 | |
| 2737 | gdb_assert (regcache_arch == gdbarch); |
| 2738 | |
| 2739 | if (IS_SPE_PSEUDOREG (tdep, reg_nr)) |
| 2740 | e500_pseudo_register_write (gdbarch, regcache, reg_nr, buffer); |
| 2741 | else if (IS_DFP_PSEUDOREG (tdep, reg_nr)) |
| 2742 | dfp_pseudo_register_write (gdbarch, regcache, reg_nr, buffer); |
| 2743 | else if (IS_VSX_PSEUDOREG (tdep, reg_nr)) |
| 2744 | vsx_pseudo_register_write (gdbarch, regcache, reg_nr, buffer); |
| 2745 | else if (IS_EFP_PSEUDOREG (tdep, reg_nr)) |
| 2746 | efpr_pseudo_register_write (gdbarch, regcache, reg_nr, buffer); |
| 2747 | else |
| 2748 | internal_error (__FILE__, __LINE__, |
| 2749 | _("rs6000_pseudo_register_write: " |
| 2750 | "called on unexpected register '%s' (%d)"), |
| 2751 | gdbarch_register_name (gdbarch, reg_nr), reg_nr); |
| 2752 | } |
| 2753 | |
| 2754 | /* Convert a DBX STABS register number to a GDB register number. */ |
| 2755 | static int |
| 2756 | rs6000_stab_reg_to_regnum (struct gdbarch *gdbarch, int num) |
| 2757 | { |
| 2758 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 2759 | |
| 2760 | if (0 <= num && num <= 31) |
| 2761 | return tdep->ppc_gp0_regnum + num; |
| 2762 | else if (32 <= num && num <= 63) |
| 2763 | /* FIXME: jimb/2004-05-05: What should we do when the debug info |
| 2764 | specifies registers the architecture doesn't have? Our |
| 2765 | callers don't check the value we return. */ |
| 2766 | return tdep->ppc_fp0_regnum + (num - 32); |
| 2767 | else if (77 <= num && num <= 108) |
| 2768 | return tdep->ppc_vr0_regnum + (num - 77); |
| 2769 | else if (1200 <= num && num < 1200 + 32) |
| 2770 | return tdep->ppc_ev0_regnum + (num - 1200); |
| 2771 | else |
| 2772 | switch (num) |
| 2773 | { |
| 2774 | case 64: |
| 2775 | return tdep->ppc_mq_regnum; |
| 2776 | case 65: |
| 2777 | return tdep->ppc_lr_regnum; |
| 2778 | case 66: |
| 2779 | return tdep->ppc_ctr_regnum; |
| 2780 | case 76: |
| 2781 | return tdep->ppc_xer_regnum; |
| 2782 | case 109: |
| 2783 | return tdep->ppc_vrsave_regnum; |
| 2784 | case 110: |
| 2785 | return tdep->ppc_vrsave_regnum - 1; /* vscr */ |
| 2786 | case 111: |
| 2787 | return tdep->ppc_acc_regnum; |
| 2788 | case 112: |
| 2789 | return tdep->ppc_spefscr_regnum; |
| 2790 | default: |
| 2791 | return num; |
| 2792 | } |
| 2793 | } |
| 2794 | |
| 2795 | |
| 2796 | /* Convert a Dwarf 2 register number to a GDB register number. */ |
| 2797 | static int |
| 2798 | rs6000_dwarf2_reg_to_regnum (struct gdbarch *gdbarch, int num) |
| 2799 | { |
| 2800 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 2801 | |
| 2802 | if (0 <= num && num <= 31) |
| 2803 | return tdep->ppc_gp0_regnum + num; |
| 2804 | else if (32 <= num && num <= 63) |
| 2805 | /* FIXME: jimb/2004-05-05: What should we do when the debug info |
| 2806 | specifies registers the architecture doesn't have? Our |
| 2807 | callers don't check the value we return. */ |
| 2808 | return tdep->ppc_fp0_regnum + (num - 32); |
| 2809 | else if (1124 <= num && num < 1124 + 32) |
| 2810 | return tdep->ppc_vr0_regnum + (num - 1124); |
| 2811 | else if (1200 <= num && num < 1200 + 32) |
| 2812 | return tdep->ppc_ev0_regnum + (num - 1200); |
| 2813 | else |
| 2814 | switch (num) |
| 2815 | { |
| 2816 | case 64: |
| 2817 | return tdep->ppc_cr_regnum; |
| 2818 | case 67: |
| 2819 | return tdep->ppc_vrsave_regnum - 1; /* vscr */ |
| 2820 | case 99: |
| 2821 | return tdep->ppc_acc_regnum; |
| 2822 | case 100: |
| 2823 | return tdep->ppc_mq_regnum; |
| 2824 | case 101: |
| 2825 | return tdep->ppc_xer_regnum; |
| 2826 | case 108: |
| 2827 | return tdep->ppc_lr_regnum; |
| 2828 | case 109: |
| 2829 | return tdep->ppc_ctr_regnum; |
| 2830 | case 356: |
| 2831 | return tdep->ppc_vrsave_regnum; |
| 2832 | case 612: |
| 2833 | return tdep->ppc_spefscr_regnum; |
| 2834 | default: |
| 2835 | return num; |
| 2836 | } |
| 2837 | } |
| 2838 | |
| 2839 | /* Translate a .eh_frame register to DWARF register, or adjust a |
| 2840 | .debug_frame register. */ |
| 2841 | |
| 2842 | static int |
| 2843 | rs6000_adjust_frame_regnum (struct gdbarch *gdbarch, int num, int eh_frame_p) |
| 2844 | { |
| 2845 | /* GCC releases before 3.4 use GCC internal register numbering in |
| 2846 | .debug_frame (and .debug_info, et cetera). The numbering is |
| 2847 | different from the standard SysV numbering for everything except |
| 2848 | for GPRs and FPRs. We can not detect this problem in most cases |
| 2849 | - to get accurate debug info for variables living in lr, ctr, v0, |
| 2850 | et cetera, use a newer version of GCC. But we must detect |
| 2851 | one important case - lr is in column 65 in .debug_frame output, |
| 2852 | instead of 108. |
| 2853 | |
| 2854 | GCC 3.4, and the "hammer" branch, have a related problem. They |
| 2855 | record lr register saves in .debug_frame as 108, but still record |
| 2856 | the return column as 65. We fix that up too. |
| 2857 | |
| 2858 | We can do this because 65 is assigned to fpsr, and GCC never |
| 2859 | generates debug info referring to it. To add support for |
| 2860 | handwritten debug info that restores fpsr, we would need to add a |
| 2861 | producer version check to this. */ |
| 2862 | if (!eh_frame_p) |
| 2863 | { |
| 2864 | if (num == 65) |
| 2865 | return 108; |
| 2866 | else |
| 2867 | return num; |
| 2868 | } |
| 2869 | |
| 2870 | /* .eh_frame is GCC specific. For binary compatibility, it uses GCC |
| 2871 | internal register numbering; translate that to the standard DWARF2 |
| 2872 | register numbering. */ |
| 2873 | if (0 <= num && num <= 63) /* r0-r31,fp0-fp31 */ |
| 2874 | return num; |
| 2875 | else if (68 <= num && num <= 75) /* cr0-cr8 */ |
| 2876 | return num - 68 + 86; |
| 2877 | else if (77 <= num && num <= 108) /* vr0-vr31 */ |
| 2878 | return num - 77 + 1124; |
| 2879 | else |
| 2880 | switch (num) |
| 2881 | { |
| 2882 | case 64: /* mq */ |
| 2883 | return 100; |
| 2884 | case 65: /* lr */ |
| 2885 | return 108; |
| 2886 | case 66: /* ctr */ |
| 2887 | return 109; |
| 2888 | case 76: /* xer */ |
| 2889 | return 101; |
| 2890 | case 109: /* vrsave */ |
| 2891 | return 356; |
| 2892 | case 110: /* vscr */ |
| 2893 | return 67; |
| 2894 | case 111: /* spe_acc */ |
| 2895 | return 99; |
| 2896 | case 112: /* spefscr */ |
| 2897 | return 612; |
| 2898 | default: |
| 2899 | return num; |
| 2900 | } |
| 2901 | } |
| 2902 | \f |
| 2903 | |
| 2904 | /* Handling the various POWER/PowerPC variants. */ |
| 2905 | |
| 2906 | /* Information about a particular processor variant. */ |
| 2907 | |
| 2908 | struct variant |
| 2909 | { |
| 2910 | /* Name of this variant. */ |
| 2911 | char *name; |
| 2912 | |
| 2913 | /* English description of the variant. */ |
| 2914 | char *description; |
| 2915 | |
| 2916 | /* bfd_arch_info.arch corresponding to variant. */ |
| 2917 | enum bfd_architecture arch; |
| 2918 | |
| 2919 | /* bfd_arch_info.mach corresponding to variant. */ |
| 2920 | unsigned long mach; |
| 2921 | |
| 2922 | /* Target description for this variant. */ |
| 2923 | struct target_desc **tdesc; |
| 2924 | }; |
| 2925 | |
| 2926 | static struct variant variants[] = |
| 2927 | { |
| 2928 | {"powerpc", "PowerPC user-level", bfd_arch_powerpc, |
| 2929 | bfd_mach_ppc, &tdesc_powerpc_altivec32}, |
| 2930 | {"power", "POWER user-level", bfd_arch_rs6000, |
| 2931 | bfd_mach_rs6k, &tdesc_rs6000}, |
| 2932 | {"403", "IBM PowerPC 403", bfd_arch_powerpc, |
| 2933 | bfd_mach_ppc_403, &tdesc_powerpc_403}, |
| 2934 | {"601", "Motorola PowerPC 601", bfd_arch_powerpc, |
| 2935 | bfd_mach_ppc_601, &tdesc_powerpc_601}, |
| 2936 | {"602", "Motorola PowerPC 602", bfd_arch_powerpc, |
| 2937 | bfd_mach_ppc_602, &tdesc_powerpc_602}, |
| 2938 | {"603", "Motorola/IBM PowerPC 603 or 603e", bfd_arch_powerpc, |
| 2939 | bfd_mach_ppc_603, &tdesc_powerpc_603}, |
| 2940 | {"604", "Motorola PowerPC 604 or 604e", bfd_arch_powerpc, |
| 2941 | 604, &tdesc_powerpc_604}, |
| 2942 | {"403GC", "IBM PowerPC 403GC", bfd_arch_powerpc, |
| 2943 | bfd_mach_ppc_403gc, &tdesc_powerpc_403gc}, |
| 2944 | {"505", "Motorola PowerPC 505", bfd_arch_powerpc, |
| 2945 | bfd_mach_ppc_505, &tdesc_powerpc_505}, |
| 2946 | {"860", "Motorola PowerPC 860 or 850", bfd_arch_powerpc, |
| 2947 | bfd_mach_ppc_860, &tdesc_powerpc_860}, |
| 2948 | {"750", "Motorola/IBM PowerPC 750 or 740", bfd_arch_powerpc, |
| 2949 | bfd_mach_ppc_750, &tdesc_powerpc_750}, |
| 2950 | {"7400", "Motorola/IBM PowerPC 7400 (G4)", bfd_arch_powerpc, |
| 2951 | bfd_mach_ppc_7400, &tdesc_powerpc_7400}, |
| 2952 | {"e500", "Motorola PowerPC e500", bfd_arch_powerpc, |
| 2953 | bfd_mach_ppc_e500, &tdesc_powerpc_e500}, |
| 2954 | |
| 2955 | /* 64-bit */ |
| 2956 | {"powerpc64", "PowerPC 64-bit user-level", bfd_arch_powerpc, |
| 2957 | bfd_mach_ppc64, &tdesc_powerpc_altivec64}, |
| 2958 | {"620", "Motorola PowerPC 620", bfd_arch_powerpc, |
| 2959 | bfd_mach_ppc_620, &tdesc_powerpc_64}, |
| 2960 | {"630", "Motorola PowerPC 630", bfd_arch_powerpc, |
| 2961 | bfd_mach_ppc_630, &tdesc_powerpc_64}, |
| 2962 | {"a35", "PowerPC A35", bfd_arch_powerpc, |
| 2963 | bfd_mach_ppc_a35, &tdesc_powerpc_64}, |
| 2964 | {"rs64ii", "PowerPC rs64ii", bfd_arch_powerpc, |
| 2965 | bfd_mach_ppc_rs64ii, &tdesc_powerpc_64}, |
| 2966 | {"rs64iii", "PowerPC rs64iii", bfd_arch_powerpc, |
| 2967 | bfd_mach_ppc_rs64iii, &tdesc_powerpc_64}, |
| 2968 | |
| 2969 | /* FIXME: I haven't checked the register sets of the following. */ |
| 2970 | {"rs1", "IBM POWER RS1", bfd_arch_rs6000, |
| 2971 | bfd_mach_rs6k_rs1, &tdesc_rs6000}, |
| 2972 | {"rsc", "IBM POWER RSC", bfd_arch_rs6000, |
| 2973 | bfd_mach_rs6k_rsc, &tdesc_rs6000}, |
| 2974 | {"rs2", "IBM POWER RS2", bfd_arch_rs6000, |
| 2975 | bfd_mach_rs6k_rs2, &tdesc_rs6000}, |
| 2976 | |
| 2977 | {0, 0, 0, 0, 0} |
| 2978 | }; |
| 2979 | |
| 2980 | /* Return the variant corresponding to architecture ARCH and machine number |
| 2981 | MACH. If no such variant exists, return null. */ |
| 2982 | |
| 2983 | static const struct variant * |
| 2984 | find_variant_by_arch (enum bfd_architecture arch, unsigned long mach) |
| 2985 | { |
| 2986 | const struct variant *v; |
| 2987 | |
| 2988 | for (v = variants; v->name; v++) |
| 2989 | if (arch == v->arch && mach == v->mach) |
| 2990 | return v; |
| 2991 | |
| 2992 | return NULL; |
| 2993 | } |
| 2994 | |
| 2995 | static int |
| 2996 | gdb_print_insn_powerpc (bfd_vma memaddr, disassemble_info *info) |
| 2997 | { |
| 2998 | if (!info->disassembler_options) |
| 2999 | info->disassembler_options = "any"; |
| 3000 | |
| 3001 | if (info->endian == BFD_ENDIAN_BIG) |
| 3002 | return print_insn_big_powerpc (memaddr, info); |
| 3003 | else |
| 3004 | return print_insn_little_powerpc (memaddr, info); |
| 3005 | } |
| 3006 | \f |
| 3007 | static CORE_ADDR |
| 3008 | rs6000_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 3009 | { |
| 3010 | return frame_unwind_register_unsigned (next_frame, |
| 3011 | gdbarch_pc_regnum (gdbarch)); |
| 3012 | } |
| 3013 | |
| 3014 | static struct frame_id |
| 3015 | rs6000_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
| 3016 | { |
| 3017 | return frame_id_build (get_frame_register_unsigned |
| 3018 | (this_frame, gdbarch_sp_regnum (gdbarch)), |
| 3019 | get_frame_pc (this_frame)); |
| 3020 | } |
| 3021 | |
| 3022 | struct rs6000_frame_cache |
| 3023 | { |
| 3024 | CORE_ADDR base; |
| 3025 | CORE_ADDR initial_sp; |
| 3026 | struct trad_frame_saved_reg *saved_regs; |
| 3027 | }; |
| 3028 | |
| 3029 | static struct rs6000_frame_cache * |
| 3030 | rs6000_frame_cache (struct frame_info *this_frame, void **this_cache) |
| 3031 | { |
| 3032 | struct rs6000_frame_cache *cache; |
| 3033 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 3034 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 3035 | struct rs6000_framedata fdata; |
| 3036 | int wordsize = tdep->wordsize; |
| 3037 | CORE_ADDR func, pc; |
| 3038 | |
| 3039 | if ((*this_cache) != NULL) |
| 3040 | return (*this_cache); |
| 3041 | cache = FRAME_OBSTACK_ZALLOC (struct rs6000_frame_cache); |
| 3042 | (*this_cache) = cache; |
| 3043 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
| 3044 | |
| 3045 | func = get_frame_func (this_frame); |
| 3046 | pc = get_frame_pc (this_frame); |
| 3047 | skip_prologue (gdbarch, func, pc, &fdata); |
| 3048 | |
| 3049 | /* Figure out the parent's stack pointer. */ |
| 3050 | |
| 3051 | /* NOTE: cagney/2002-04-14: The ->frame points to the inner-most |
| 3052 | address of the current frame. Things might be easier if the |
| 3053 | ->frame pointed to the outer-most address of the frame. In |
| 3054 | the mean time, the address of the prev frame is used as the |
| 3055 | base address of this frame. */ |
| 3056 | cache->base = get_frame_register_unsigned |
| 3057 | (this_frame, gdbarch_sp_regnum (gdbarch)); |
| 3058 | |
| 3059 | /* If the function appears to be frameless, check a couple of likely |
| 3060 | indicators that we have simply failed to find the frame setup. |
| 3061 | Two common cases of this are missing symbols (i.e. |
| 3062 | get_frame_func returns the wrong address or 0), and assembly |
| 3063 | stubs which have a fast exit path but set up a frame on the slow |
| 3064 | path. |
| 3065 | |
| 3066 | If the LR appears to return to this function, then presume that |
| 3067 | we have an ABI compliant frame that we failed to find. */ |
| 3068 | if (fdata.frameless && fdata.lr_offset == 0) |
| 3069 | { |
| 3070 | CORE_ADDR saved_lr; |
| 3071 | int make_frame = 0; |
| 3072 | |
| 3073 | saved_lr = get_frame_register_unsigned (this_frame, tdep->ppc_lr_regnum); |
| 3074 | if (func == 0 && saved_lr == pc) |
| 3075 | make_frame = 1; |
| 3076 | else if (func != 0) |
| 3077 | { |
| 3078 | CORE_ADDR saved_func = get_pc_function_start (saved_lr); |
| 3079 | if (func == saved_func) |
| 3080 | make_frame = 1; |
| 3081 | } |
| 3082 | |
| 3083 | if (make_frame) |
| 3084 | { |
| 3085 | fdata.frameless = 0; |
| 3086 | fdata.lr_offset = tdep->lr_frame_offset; |
| 3087 | } |
| 3088 | } |
| 3089 | |
| 3090 | if (!fdata.frameless) |
| 3091 | /* Frameless really means stackless. */ |
| 3092 | cache->base = read_memory_unsigned_integer (cache->base, wordsize); |
| 3093 | |
| 3094 | trad_frame_set_value (cache->saved_regs, |
| 3095 | gdbarch_sp_regnum (gdbarch), cache->base); |
| 3096 | |
| 3097 | /* if != -1, fdata.saved_fpr is the smallest number of saved_fpr. |
| 3098 | All fpr's from saved_fpr to fp31 are saved. */ |
| 3099 | |
| 3100 | if (fdata.saved_fpr >= 0) |
| 3101 | { |
| 3102 | int i; |
| 3103 | CORE_ADDR fpr_addr = cache->base + fdata.fpr_offset; |
| 3104 | |
| 3105 | /* If skip_prologue says floating-point registers were saved, |
| 3106 | but the current architecture has no floating-point registers, |
| 3107 | then that's strange. But we have no indices to even record |
| 3108 | the addresses under, so we just ignore it. */ |
| 3109 | if (ppc_floating_point_unit_p (gdbarch)) |
| 3110 | for (i = fdata.saved_fpr; i < ppc_num_fprs; i++) |
| 3111 | { |
| 3112 | cache->saved_regs[tdep->ppc_fp0_regnum + i].addr = fpr_addr; |
| 3113 | fpr_addr += 8; |
| 3114 | } |
| 3115 | } |
| 3116 | |
| 3117 | /* if != -1, fdata.saved_gpr is the smallest number of saved_gpr. |
| 3118 | All gpr's from saved_gpr to gpr31 are saved (except during the |
| 3119 | prologue). */ |
| 3120 | |
| 3121 | if (fdata.saved_gpr >= 0) |
| 3122 | { |
| 3123 | int i; |
| 3124 | CORE_ADDR gpr_addr = cache->base + fdata.gpr_offset; |
| 3125 | for (i = fdata.saved_gpr; i < ppc_num_gprs; i++) |
| 3126 | { |
| 3127 | if (fdata.gpr_mask & (1U << i)) |
| 3128 | cache->saved_regs[tdep->ppc_gp0_regnum + i].addr = gpr_addr; |
| 3129 | gpr_addr += wordsize; |
| 3130 | } |
| 3131 | } |
| 3132 | |
| 3133 | /* if != -1, fdata.saved_vr is the smallest number of saved_vr. |
| 3134 | All vr's from saved_vr to vr31 are saved. */ |
| 3135 | if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1) |
| 3136 | { |
| 3137 | if (fdata.saved_vr >= 0) |
| 3138 | { |
| 3139 | int i; |
| 3140 | CORE_ADDR vr_addr = cache->base + fdata.vr_offset; |
| 3141 | for (i = fdata.saved_vr; i < 32; i++) |
| 3142 | { |
| 3143 | cache->saved_regs[tdep->ppc_vr0_regnum + i].addr = vr_addr; |
| 3144 | vr_addr += register_size (gdbarch, tdep->ppc_vr0_regnum); |
| 3145 | } |
| 3146 | } |
| 3147 | } |
| 3148 | |
| 3149 | /* if != -1, fdata.saved_ev is the smallest number of saved_ev. |
| 3150 | All vr's from saved_ev to ev31 are saved. ????? */ |
| 3151 | if (tdep->ppc_ev0_regnum != -1) |
| 3152 | { |
| 3153 | if (fdata.saved_ev >= 0) |
| 3154 | { |
| 3155 | int i; |
| 3156 | CORE_ADDR ev_addr = cache->base + fdata.ev_offset; |
| 3157 | for (i = fdata.saved_ev; i < ppc_num_gprs; i++) |
| 3158 | { |
| 3159 | cache->saved_regs[tdep->ppc_ev0_regnum + i].addr = ev_addr; |
| 3160 | cache->saved_regs[tdep->ppc_gp0_regnum + i].addr = ev_addr + 4; |
| 3161 | ev_addr += register_size (gdbarch, tdep->ppc_ev0_regnum); |
| 3162 | } |
| 3163 | } |
| 3164 | } |
| 3165 | |
| 3166 | /* If != 0, fdata.cr_offset is the offset from the frame that |
| 3167 | holds the CR. */ |
| 3168 | if (fdata.cr_offset != 0) |
| 3169 | cache->saved_regs[tdep->ppc_cr_regnum].addr = cache->base + fdata.cr_offset; |
| 3170 | |
| 3171 | /* If != 0, fdata.lr_offset is the offset from the frame that |
| 3172 | holds the LR. */ |
| 3173 | if (fdata.lr_offset != 0) |
| 3174 | cache->saved_regs[tdep->ppc_lr_regnum].addr = cache->base + fdata.lr_offset; |
| 3175 | else if (fdata.lr_register != -1) |
| 3176 | cache->saved_regs[tdep->ppc_lr_regnum].realreg = fdata.lr_register; |
| 3177 | /* The PC is found in the link register. */ |
| 3178 | cache->saved_regs[gdbarch_pc_regnum (gdbarch)] = |
| 3179 | cache->saved_regs[tdep->ppc_lr_regnum]; |
| 3180 | |
| 3181 | /* If != 0, fdata.vrsave_offset is the offset from the frame that |
| 3182 | holds the VRSAVE. */ |
| 3183 | if (fdata.vrsave_offset != 0) |
| 3184 | cache->saved_regs[tdep->ppc_vrsave_regnum].addr = cache->base + fdata.vrsave_offset; |
| 3185 | |
| 3186 | if (fdata.alloca_reg < 0) |
| 3187 | /* If no alloca register used, then fi->frame is the value of the |
| 3188 | %sp for this frame, and it is good enough. */ |
| 3189 | cache->initial_sp |
| 3190 | = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch)); |
| 3191 | else |
| 3192 | cache->initial_sp |
| 3193 | = get_frame_register_unsigned (this_frame, fdata.alloca_reg); |
| 3194 | |
| 3195 | return cache; |
| 3196 | } |
| 3197 | |
| 3198 | static void |
| 3199 | rs6000_frame_this_id (struct frame_info *this_frame, void **this_cache, |
| 3200 | struct frame_id *this_id) |
| 3201 | { |
| 3202 | struct rs6000_frame_cache *info = rs6000_frame_cache (this_frame, |
| 3203 | this_cache); |
| 3204 | /* This marks the outermost frame. */ |
| 3205 | if (info->base == 0) |
| 3206 | return; |
| 3207 | |
| 3208 | (*this_id) = frame_id_build (info->base, get_frame_func (this_frame)); |
| 3209 | } |
| 3210 | |
| 3211 | static struct value * |
| 3212 | rs6000_frame_prev_register (struct frame_info *this_frame, |
| 3213 | void **this_cache, int regnum) |
| 3214 | { |
| 3215 | struct rs6000_frame_cache *info = rs6000_frame_cache (this_frame, |
| 3216 | this_cache); |
| 3217 | return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum); |
| 3218 | } |
| 3219 | |
| 3220 | static const struct frame_unwind rs6000_frame_unwind = |
| 3221 | { |
| 3222 | NORMAL_FRAME, |
| 3223 | rs6000_frame_this_id, |
| 3224 | rs6000_frame_prev_register, |
| 3225 | NULL, |
| 3226 | default_frame_sniffer |
| 3227 | }; |
| 3228 | \f |
| 3229 | |
| 3230 | static CORE_ADDR |
| 3231 | rs6000_frame_base_address (struct frame_info *this_frame, void **this_cache) |
| 3232 | { |
| 3233 | struct rs6000_frame_cache *info = rs6000_frame_cache (this_frame, |
| 3234 | this_cache); |
| 3235 | return info->initial_sp; |
| 3236 | } |
| 3237 | |
| 3238 | static const struct frame_base rs6000_frame_base = { |
| 3239 | &rs6000_frame_unwind, |
| 3240 | rs6000_frame_base_address, |
| 3241 | rs6000_frame_base_address, |
| 3242 | rs6000_frame_base_address |
| 3243 | }; |
| 3244 | |
| 3245 | static const struct frame_base * |
| 3246 | rs6000_frame_base_sniffer (struct frame_info *this_frame) |
| 3247 | { |
| 3248 | return &rs6000_frame_base; |
| 3249 | } |
| 3250 | |
| 3251 | /* DWARF-2 frame support. Used to handle the detection of |
| 3252 | clobbered registers during function calls. */ |
| 3253 | |
| 3254 | static void |
| 3255 | ppc_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, |
| 3256 | struct dwarf2_frame_state_reg *reg, |
| 3257 | struct frame_info *this_frame) |
| 3258 | { |
| 3259 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 3260 | |
| 3261 | /* PPC32 and PPC64 ABI's are the same regarding volatile and |
| 3262 | non-volatile registers. We will use the same code for both. */ |
| 3263 | |
| 3264 | /* Call-saved GP registers. */ |
| 3265 | if ((regnum >= tdep->ppc_gp0_regnum + 14 |
| 3266 | && regnum <= tdep->ppc_gp0_regnum + 31) |
| 3267 | || (regnum == tdep->ppc_gp0_regnum + 1)) |
| 3268 | reg->how = DWARF2_FRAME_REG_SAME_VALUE; |
| 3269 | |
| 3270 | /* Call-clobbered GP registers. */ |
| 3271 | if ((regnum >= tdep->ppc_gp0_regnum + 3 |
| 3272 | && regnum <= tdep->ppc_gp0_regnum + 12) |
| 3273 | || (regnum == tdep->ppc_gp0_regnum)) |
| 3274 | reg->how = DWARF2_FRAME_REG_UNDEFINED; |
| 3275 | |
| 3276 | /* Deal with FP registers, if supported. */ |
| 3277 | if (tdep->ppc_fp0_regnum >= 0) |
| 3278 | { |
| 3279 | /* Call-saved FP registers. */ |
| 3280 | if ((regnum >= tdep->ppc_fp0_regnum + 14 |
| 3281 | && regnum <= tdep->ppc_fp0_regnum + 31)) |
| 3282 | reg->how = DWARF2_FRAME_REG_SAME_VALUE; |
| 3283 | |
| 3284 | /* Call-clobbered FP registers. */ |
| 3285 | if ((regnum >= tdep->ppc_fp0_regnum |
| 3286 | && regnum <= tdep->ppc_fp0_regnum + 13)) |
| 3287 | reg->how = DWARF2_FRAME_REG_UNDEFINED; |
| 3288 | } |
| 3289 | |
| 3290 | /* Deal with ALTIVEC registers, if supported. */ |
| 3291 | if (tdep->ppc_vr0_regnum > 0 && tdep->ppc_vrsave_regnum > 0) |
| 3292 | { |
| 3293 | /* Call-saved Altivec registers. */ |
| 3294 | if ((regnum >= tdep->ppc_vr0_regnum + 20 |
| 3295 | && regnum <= tdep->ppc_vr0_regnum + 31) |
| 3296 | || regnum == tdep->ppc_vrsave_regnum) |
| 3297 | reg->how = DWARF2_FRAME_REG_SAME_VALUE; |
| 3298 | |
| 3299 | /* Call-clobbered Altivec registers. */ |
| 3300 | if ((regnum >= tdep->ppc_vr0_regnum |
| 3301 | && regnum <= tdep->ppc_vr0_regnum + 19)) |
| 3302 | reg->how = DWARF2_FRAME_REG_UNDEFINED; |
| 3303 | } |
| 3304 | |
| 3305 | /* Handle PC register and Stack Pointer correctly. */ |
| 3306 | if (regnum == gdbarch_pc_regnum (gdbarch)) |
| 3307 | reg->how = DWARF2_FRAME_REG_RA; |
| 3308 | else if (regnum == gdbarch_sp_regnum (gdbarch)) |
| 3309 | reg->how = DWARF2_FRAME_REG_CFA; |
| 3310 | } |
| 3311 | |
| 3312 | |
| 3313 | /* Initialize the current architecture based on INFO. If possible, re-use an |
| 3314 | architecture from ARCHES, which is a list of architectures already created |
| 3315 | during this debugging session. |
| 3316 | |
| 3317 | Called e.g. at program startup, when reading a core file, and when reading |
| 3318 | a binary file. */ |
| 3319 | |
| 3320 | static struct gdbarch * |
| 3321 | rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 3322 | { |
| 3323 | struct gdbarch *gdbarch; |
| 3324 | struct gdbarch_tdep *tdep; |
| 3325 | int wordsize, from_xcoff_exec, from_elf_exec; |
| 3326 | enum bfd_architecture arch; |
| 3327 | unsigned long mach; |
| 3328 | bfd abfd; |
| 3329 | asection *sect; |
| 3330 | enum auto_boolean soft_float_flag = powerpc_soft_float_global; |
| 3331 | int soft_float; |
| 3332 | enum powerpc_vector_abi vector_abi = powerpc_vector_abi_global; |
| 3333 | int have_fpu = 1, have_spe = 0, have_mq = 0, have_altivec = 0, have_dfp = 0, |
| 3334 | have_vsx = 0; |
| 3335 | int tdesc_wordsize = -1; |
| 3336 | const struct target_desc *tdesc = info.target_desc; |
| 3337 | struct tdesc_arch_data *tdesc_data = NULL; |
| 3338 | int num_pseudoregs = 0; |
| 3339 | int cur_reg; |
| 3340 | |
| 3341 | from_xcoff_exec = info.abfd && info.abfd->format == bfd_object && |
| 3342 | bfd_get_flavour (info.abfd) == bfd_target_xcoff_flavour; |
| 3343 | |
| 3344 | from_elf_exec = info.abfd && info.abfd->format == bfd_object && |
| 3345 | bfd_get_flavour (info.abfd) == bfd_target_elf_flavour; |
| 3346 | |
| 3347 | /* Check word size. If INFO is from a binary file, infer it from |
| 3348 | that, else choose a likely default. */ |
| 3349 | if (from_xcoff_exec) |
| 3350 | { |
| 3351 | if (bfd_xcoff_is_xcoff64 (info.abfd)) |
| 3352 | wordsize = 8; |
| 3353 | else |
| 3354 | wordsize = 4; |
| 3355 | } |
| 3356 | else if (from_elf_exec) |
| 3357 | { |
| 3358 | if (elf_elfheader (info.abfd)->e_ident[EI_CLASS] == ELFCLASS64) |
| 3359 | wordsize = 8; |
| 3360 | else |
| 3361 | wordsize = 4; |
| 3362 | } |
| 3363 | else if (tdesc_has_registers (tdesc)) |
| 3364 | wordsize = -1; |
| 3365 | else |
| 3366 | { |
| 3367 | if (info.bfd_arch_info != NULL && info.bfd_arch_info->bits_per_word != 0) |
| 3368 | wordsize = info.bfd_arch_info->bits_per_word / |
| 3369 | info.bfd_arch_info->bits_per_byte; |
| 3370 | else |
| 3371 | wordsize = 4; |
| 3372 | } |
| 3373 | |
| 3374 | /* Get the architecture and machine from the BFD. */ |
| 3375 | arch = info.bfd_arch_info->arch; |
| 3376 | mach = info.bfd_arch_info->mach; |
| 3377 | |
| 3378 | /* For e500 executables, the apuinfo section is of help here. Such |
| 3379 | section contains the identifier and revision number of each |
| 3380 | Application-specific Processing Unit that is present on the |
| 3381 | chip. The content of the section is determined by the assembler |
| 3382 | which looks at each instruction and determines which unit (and |
| 3383 | which version of it) can execute it. In our case we just look for |
| 3384 | the existance of the section. */ |
| 3385 | |
| 3386 | if (info.abfd) |
| 3387 | { |
| 3388 | sect = bfd_get_section_by_name (info.abfd, ".PPC.EMB.apuinfo"); |
| 3389 | if (sect) |
| 3390 | { |
| 3391 | arch = info.bfd_arch_info->arch; |
| 3392 | mach = bfd_mach_ppc_e500; |
| 3393 | bfd_default_set_arch_mach (&abfd, arch, mach); |
| 3394 | info.bfd_arch_info = bfd_get_arch_info (&abfd); |
| 3395 | } |
| 3396 | } |
| 3397 | |
| 3398 | /* Find a default target description which describes our register |
| 3399 | layout, if we do not already have one. */ |
| 3400 | if (! tdesc_has_registers (tdesc)) |
| 3401 | { |
| 3402 | const struct variant *v; |
| 3403 | |
| 3404 | /* Choose variant. */ |
| 3405 | v = find_variant_by_arch (arch, mach); |
| 3406 | if (!v) |
| 3407 | return NULL; |
| 3408 | |
| 3409 | tdesc = *v->tdesc; |
| 3410 | } |
| 3411 | |
| 3412 | gdb_assert (tdesc_has_registers (tdesc)); |
| 3413 | |
| 3414 | /* Check any target description for validity. */ |
| 3415 | if (tdesc_has_registers (tdesc)) |
| 3416 | { |
| 3417 | static const char *const gprs[] = { |
| 3418 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| 3419 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", |
| 3420 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", |
| 3421 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31" |
| 3422 | }; |
| 3423 | static const char *const segment_regs[] = { |
| 3424 | "sr0", "sr1", "sr2", "sr3", "sr4", "sr5", "sr6", "sr7", |
| 3425 | "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15" |
| 3426 | }; |
| 3427 | const struct tdesc_feature *feature; |
| 3428 | int i, valid_p; |
| 3429 | static const char *const msr_names[] = { "msr", "ps" }; |
| 3430 | static const char *const cr_names[] = { "cr", "cnd" }; |
| 3431 | static const char *const ctr_names[] = { "ctr", "cnt" }; |
| 3432 | |
| 3433 | feature = tdesc_find_feature (tdesc, |
| 3434 | "org.gnu.gdb.power.core"); |
| 3435 | if (feature == NULL) |
| 3436 | return NULL; |
| 3437 | |
| 3438 | tdesc_data = tdesc_data_alloc (); |
| 3439 | |
| 3440 | valid_p = 1; |
| 3441 | for (i = 0; i < ppc_num_gprs; i++) |
| 3442 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, gprs[i]); |
| 3443 | valid_p &= tdesc_numbered_register (feature, tdesc_data, PPC_PC_REGNUM, |
| 3444 | "pc"); |
| 3445 | valid_p &= tdesc_numbered_register (feature, tdesc_data, PPC_LR_REGNUM, |
| 3446 | "lr"); |
| 3447 | valid_p &= tdesc_numbered_register (feature, tdesc_data, PPC_XER_REGNUM, |
| 3448 | "xer"); |
| 3449 | |
| 3450 | /* Allow alternate names for these registers, to accomodate GDB's |
| 3451 | historic naming. */ |
| 3452 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, |
| 3453 | PPC_MSR_REGNUM, msr_names); |
| 3454 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, |
| 3455 | PPC_CR_REGNUM, cr_names); |
| 3456 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, |
| 3457 | PPC_CTR_REGNUM, ctr_names); |
| 3458 | |
| 3459 | if (!valid_p) |
| 3460 | { |
| 3461 | tdesc_data_cleanup (tdesc_data); |
| 3462 | return NULL; |
| 3463 | } |
| 3464 | |
| 3465 | have_mq = tdesc_numbered_register (feature, tdesc_data, PPC_MQ_REGNUM, |
| 3466 | "mq"); |
| 3467 | |
| 3468 | tdesc_wordsize = tdesc_register_size (feature, "pc") / 8; |
| 3469 | if (wordsize == -1) |
| 3470 | wordsize = tdesc_wordsize; |
| 3471 | |
| 3472 | feature = tdesc_find_feature (tdesc, |
| 3473 | "org.gnu.gdb.power.fpu"); |
| 3474 | if (feature != NULL) |
| 3475 | { |
| 3476 | static const char *const fprs[] = { |
| 3477 | "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", |
| 3478 | "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", |
| 3479 | "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", |
| 3480 | "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31" |
| 3481 | }; |
| 3482 | valid_p = 1; |
| 3483 | for (i = 0; i < ppc_num_fprs; i++) |
| 3484 | valid_p &= tdesc_numbered_register (feature, tdesc_data, |
| 3485 | PPC_F0_REGNUM + i, fprs[i]); |
| 3486 | valid_p &= tdesc_numbered_register (feature, tdesc_data, |
| 3487 | PPC_FPSCR_REGNUM, "fpscr"); |
| 3488 | |
| 3489 | if (!valid_p) |
| 3490 | { |
| 3491 | tdesc_data_cleanup (tdesc_data); |
| 3492 | return NULL; |
| 3493 | } |
| 3494 | have_fpu = 1; |
| 3495 | } |
| 3496 | else |
| 3497 | have_fpu = 0; |
| 3498 | |
| 3499 | /* The DFP pseudo-registers will be available when there are floating |
| 3500 | point registers. */ |
| 3501 | have_dfp = have_fpu; |
| 3502 | |
| 3503 | feature = tdesc_find_feature (tdesc, |
| 3504 | "org.gnu.gdb.power.altivec"); |
| 3505 | if (feature != NULL) |
| 3506 | { |
| 3507 | static const char *const vector_regs[] = { |
| 3508 | "vr0", "vr1", "vr2", "vr3", "vr4", "vr5", "vr6", "vr7", |
| 3509 | "vr8", "vr9", "vr10", "vr11", "vr12", "vr13", "vr14", "vr15", |
| 3510 | "vr16", "vr17", "vr18", "vr19", "vr20", "vr21", "vr22", "vr23", |
| 3511 | "vr24", "vr25", "vr26", "vr27", "vr28", "vr29", "vr30", "vr31" |
| 3512 | }; |
| 3513 | |
| 3514 | valid_p = 1; |
| 3515 | for (i = 0; i < ppc_num_gprs; i++) |
| 3516 | valid_p &= tdesc_numbered_register (feature, tdesc_data, |
| 3517 | PPC_VR0_REGNUM + i, |
| 3518 | vector_regs[i]); |
| 3519 | valid_p &= tdesc_numbered_register (feature, tdesc_data, |
| 3520 | PPC_VSCR_REGNUM, "vscr"); |
| 3521 | valid_p &= tdesc_numbered_register (feature, tdesc_data, |
| 3522 | PPC_VRSAVE_REGNUM, "vrsave"); |
| 3523 | |
| 3524 | if (have_spe || !valid_p) |
| 3525 | { |
| 3526 | tdesc_data_cleanup (tdesc_data); |
| 3527 | return NULL; |
| 3528 | } |
| 3529 | have_altivec = 1; |
| 3530 | } |
| 3531 | else |
| 3532 | have_altivec = 0; |
| 3533 | |
| 3534 | /* Check for POWER7 VSX registers support. */ |
| 3535 | feature = tdesc_find_feature (tdesc, |
| 3536 | "org.gnu.gdb.power.vsx"); |
| 3537 | |
| 3538 | if (feature != NULL) |
| 3539 | { |
| 3540 | static const char *const vsx_regs[] = { |
| 3541 | "vs0h", "vs1h", "vs2h", "vs3h", "vs4h", "vs5h", |
| 3542 | "vs6h", "vs7h", "vs8h", "vs9h", "vs10h", "vs11h", |
| 3543 | "vs12h", "vs13h", "vs14h", "vs15h", "vs16h", "vs17h", |
| 3544 | "vs18h", "vs19h", "vs20h", "vs21h", "vs22h", "vs23h", |
| 3545 | "vs24h", "vs25h", "vs26h", "vs27h", "vs28h", "vs29h", |
| 3546 | "vs30h", "vs31h" |
| 3547 | }; |
| 3548 | |
| 3549 | valid_p = 1; |
| 3550 | |
| 3551 | for (i = 0; i < ppc_num_vshrs; i++) |
| 3552 | valid_p &= tdesc_numbered_register (feature, tdesc_data, |
| 3553 | PPC_VSR0_UPPER_REGNUM + i, |
| 3554 | vsx_regs[i]); |
| 3555 | if (!valid_p) |
| 3556 | { |
| 3557 | tdesc_data_cleanup (tdesc_data); |
| 3558 | return NULL; |
| 3559 | } |
| 3560 | |
| 3561 | have_vsx = 1; |
| 3562 | } |
| 3563 | else |
| 3564 | have_vsx = 0; |
| 3565 | |
| 3566 | /* On machines supporting the SPE APU, the general-purpose registers |
| 3567 | are 64 bits long. There are SIMD vector instructions to treat them |
| 3568 | as pairs of floats, but the rest of the instruction set treats them |
| 3569 | as 32-bit registers, and only operates on their lower halves. |
| 3570 | |
| 3571 | In the GDB regcache, we treat their high and low halves as separate |
| 3572 | registers. The low halves we present as the general-purpose |
| 3573 | registers, and then we have pseudo-registers that stitch together |
| 3574 | the upper and lower halves and present them as pseudo-registers. |
| 3575 | |
| 3576 | Thus, the target description is expected to supply the upper |
| 3577 | halves separately. */ |
| 3578 | |
| 3579 | feature = tdesc_find_feature (tdesc, |
| 3580 | "org.gnu.gdb.power.spe"); |
| 3581 | if (feature != NULL) |
| 3582 | { |
| 3583 | static const char *const upper_spe[] = { |
| 3584 | "ev0h", "ev1h", "ev2h", "ev3h", |
| 3585 | "ev4h", "ev5h", "ev6h", "ev7h", |
| 3586 | "ev8h", "ev9h", "ev10h", "ev11h", |
| 3587 | "ev12h", "ev13h", "ev14h", "ev15h", |
| 3588 | "ev16h", "ev17h", "ev18h", "ev19h", |
| 3589 | "ev20h", "ev21h", "ev22h", "ev23h", |
| 3590 | "ev24h", "ev25h", "ev26h", "ev27h", |
| 3591 | "ev28h", "ev29h", "ev30h", "ev31h" |
| 3592 | }; |
| 3593 | |
| 3594 | valid_p = 1; |
| 3595 | for (i = 0; i < ppc_num_gprs; i++) |
| 3596 | valid_p &= tdesc_numbered_register (feature, tdesc_data, |
| 3597 | PPC_SPE_UPPER_GP0_REGNUM + i, |
| 3598 | upper_spe[i]); |
| 3599 | valid_p &= tdesc_numbered_register (feature, tdesc_data, |
| 3600 | PPC_SPE_ACC_REGNUM, "acc"); |
| 3601 | valid_p &= tdesc_numbered_register (feature, tdesc_data, |
| 3602 | PPC_SPE_FSCR_REGNUM, "spefscr"); |
| 3603 | |
| 3604 | if (have_mq || have_fpu || !valid_p) |
| 3605 | { |
| 3606 | tdesc_data_cleanup (tdesc_data); |
| 3607 | return NULL; |
| 3608 | } |
| 3609 | have_spe = 1; |
| 3610 | } |
| 3611 | else |
| 3612 | have_spe = 0; |
| 3613 | } |
| 3614 | |
| 3615 | /* If we have a 64-bit binary on a 32-bit target, complain. Also |
| 3616 | complain for a 32-bit binary on a 64-bit target; we do not yet |
| 3617 | support that. For instance, the 32-bit ABI routines expect |
| 3618 | 32-bit GPRs. |
| 3619 | |
| 3620 | As long as there isn't an explicit target description, we'll |
| 3621 | choose one based on the BFD architecture and get a word size |
| 3622 | matching the binary (probably powerpc:common or |
| 3623 | powerpc:common64). So there is only trouble if a 64-bit target |
| 3624 | supplies a 64-bit description while debugging a 32-bit |
| 3625 | binary. */ |
| 3626 | if (tdesc_wordsize != -1 && tdesc_wordsize != wordsize) |
| 3627 | { |
| 3628 | tdesc_data_cleanup (tdesc_data); |
| 3629 | return NULL; |
| 3630 | } |
| 3631 | |
| 3632 | #ifdef HAVE_ELF |
| 3633 | if (soft_float_flag == AUTO_BOOLEAN_AUTO && from_elf_exec) |
| 3634 | { |
| 3635 | switch (bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_GNU, |
| 3636 | Tag_GNU_Power_ABI_FP)) |
| 3637 | { |
| 3638 | case 1: |
| 3639 | soft_float_flag = AUTO_BOOLEAN_FALSE; |
| 3640 | break; |
| 3641 | case 2: |
| 3642 | soft_float_flag = AUTO_BOOLEAN_TRUE; |
| 3643 | break; |
| 3644 | default: |
| 3645 | break; |
| 3646 | } |
| 3647 | } |
| 3648 | |
| 3649 | if (vector_abi == POWERPC_VEC_AUTO && from_elf_exec) |
| 3650 | { |
| 3651 | switch (bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_GNU, |
| 3652 | Tag_GNU_Power_ABI_Vector)) |
| 3653 | { |
| 3654 | case 1: |
| 3655 | vector_abi = POWERPC_VEC_GENERIC; |
| 3656 | break; |
| 3657 | case 2: |
| 3658 | vector_abi = POWERPC_VEC_ALTIVEC; |
| 3659 | break; |
| 3660 | case 3: |
| 3661 | vector_abi = POWERPC_VEC_SPE; |
| 3662 | break; |
| 3663 | default: |
| 3664 | break; |
| 3665 | } |
| 3666 | } |
| 3667 | #endif |
| 3668 | |
| 3669 | if (soft_float_flag == AUTO_BOOLEAN_TRUE) |
| 3670 | soft_float = 1; |
| 3671 | else if (soft_float_flag == AUTO_BOOLEAN_FALSE) |
| 3672 | soft_float = 0; |
| 3673 | else |
| 3674 | soft_float = !have_fpu; |
| 3675 | |
| 3676 | /* If we have a hard float binary or setting but no floating point |
| 3677 | registers, downgrade to soft float anyway. We're still somewhat |
| 3678 | useful in this scenario. */ |
| 3679 | if (!soft_float && !have_fpu) |
| 3680 | soft_float = 1; |
| 3681 | |
| 3682 | /* Similarly for vector registers. */ |
| 3683 | if (vector_abi == POWERPC_VEC_ALTIVEC && !have_altivec) |
| 3684 | vector_abi = POWERPC_VEC_GENERIC; |
| 3685 | |
| 3686 | if (vector_abi == POWERPC_VEC_SPE && !have_spe) |
| 3687 | vector_abi = POWERPC_VEC_GENERIC; |
| 3688 | |
| 3689 | if (vector_abi == POWERPC_VEC_AUTO) |
| 3690 | { |
| 3691 | if (have_altivec) |
| 3692 | vector_abi = POWERPC_VEC_ALTIVEC; |
| 3693 | else if (have_spe) |
| 3694 | vector_abi = POWERPC_VEC_SPE; |
| 3695 | else |
| 3696 | vector_abi = POWERPC_VEC_GENERIC; |
| 3697 | } |
| 3698 | |
| 3699 | /* Do not limit the vector ABI based on available hardware, since we |
| 3700 | do not yet know what hardware we'll decide we have. Yuck! FIXME! */ |
| 3701 | |
| 3702 | /* Find a candidate among extant architectures. */ |
| 3703 | for (arches = gdbarch_list_lookup_by_info (arches, &info); |
| 3704 | arches != NULL; |
| 3705 | arches = gdbarch_list_lookup_by_info (arches->next, &info)) |
| 3706 | { |
| 3707 | /* Word size in the various PowerPC bfd_arch_info structs isn't |
| 3708 | meaningful, because 64-bit CPUs can run in 32-bit mode. So, perform |
| 3709 | separate word size check. */ |
| 3710 | tdep = gdbarch_tdep (arches->gdbarch); |
| 3711 | if (tdep && tdep->soft_float != soft_float) |
| 3712 | continue; |
| 3713 | if (tdep && tdep->vector_abi != vector_abi) |
| 3714 | continue; |
| 3715 | if (tdep && tdep->wordsize == wordsize) |
| 3716 | { |
| 3717 | if (tdesc_data != NULL) |
| 3718 | tdesc_data_cleanup (tdesc_data); |
| 3719 | return arches->gdbarch; |
| 3720 | } |
| 3721 | } |
| 3722 | |
| 3723 | /* None found, create a new architecture from INFO, whose bfd_arch_info |
| 3724 | validity depends on the source: |
| 3725 | - executable useless |
| 3726 | - rs6000_host_arch() good |
| 3727 | - core file good |
| 3728 | - "set arch" trust blindly |
| 3729 | - GDB startup useless but harmless */ |
| 3730 | |
| 3731 | tdep = XCALLOC (1, struct gdbarch_tdep); |
| 3732 | tdep->wordsize = wordsize; |
| 3733 | tdep->soft_float = soft_float; |
| 3734 | tdep->vector_abi = vector_abi; |
| 3735 | |
| 3736 | gdbarch = gdbarch_alloc (&info, tdep); |
| 3737 | |
| 3738 | tdep->ppc_gp0_regnum = PPC_R0_REGNUM; |
| 3739 | tdep->ppc_toc_regnum = PPC_R0_REGNUM + 2; |
| 3740 | tdep->ppc_ps_regnum = PPC_MSR_REGNUM; |
| 3741 | tdep->ppc_cr_regnum = PPC_CR_REGNUM; |
| 3742 | tdep->ppc_lr_regnum = PPC_LR_REGNUM; |
| 3743 | tdep->ppc_ctr_regnum = PPC_CTR_REGNUM; |
| 3744 | tdep->ppc_xer_regnum = PPC_XER_REGNUM; |
| 3745 | tdep->ppc_mq_regnum = have_mq ? PPC_MQ_REGNUM : -1; |
| 3746 | |
| 3747 | tdep->ppc_fp0_regnum = have_fpu ? PPC_F0_REGNUM : -1; |
| 3748 | tdep->ppc_fpscr_regnum = have_fpu ? PPC_FPSCR_REGNUM : -1; |
| 3749 | tdep->ppc_vsr0_upper_regnum = have_vsx ? PPC_VSR0_UPPER_REGNUM : -1; |
| 3750 | tdep->ppc_vr0_regnum = have_altivec ? PPC_VR0_REGNUM : -1; |
| 3751 | tdep->ppc_vrsave_regnum = have_altivec ? PPC_VRSAVE_REGNUM : -1; |
| 3752 | tdep->ppc_ev0_upper_regnum = have_spe ? PPC_SPE_UPPER_GP0_REGNUM : -1; |
| 3753 | tdep->ppc_acc_regnum = have_spe ? PPC_SPE_ACC_REGNUM : -1; |
| 3754 | tdep->ppc_spefscr_regnum = have_spe ? PPC_SPE_FSCR_REGNUM : -1; |
| 3755 | |
| 3756 | set_gdbarch_pc_regnum (gdbarch, PPC_PC_REGNUM); |
| 3757 | set_gdbarch_sp_regnum (gdbarch, PPC_R0_REGNUM + 1); |
| 3758 | set_gdbarch_deprecated_fp_regnum (gdbarch, PPC_R0_REGNUM + 1); |
| 3759 | set_gdbarch_fp0_regnum (gdbarch, tdep->ppc_fp0_regnum); |
| 3760 | set_gdbarch_register_sim_regno (gdbarch, rs6000_register_sim_regno); |
| 3761 | |
| 3762 | /* The XML specification for PowerPC sensibly calls the MSR "msr". |
| 3763 | GDB traditionally called it "ps", though, so let GDB add an |
| 3764 | alias. */ |
| 3765 | set_gdbarch_ps_regnum (gdbarch, tdep->ppc_ps_regnum); |
| 3766 | |
| 3767 | if (wordsize == 8) |
| 3768 | set_gdbarch_return_value (gdbarch, ppc64_sysv_abi_return_value); |
| 3769 | else |
| 3770 | set_gdbarch_return_value (gdbarch, ppc_sysv_abi_return_value); |
| 3771 | |
| 3772 | /* Set lr_frame_offset. */ |
| 3773 | if (wordsize == 8) |
| 3774 | tdep->lr_frame_offset = 16; |
| 3775 | else |
| 3776 | tdep->lr_frame_offset = 4; |
| 3777 | |
| 3778 | if (have_spe || have_dfp || have_vsx) |
| 3779 | { |
| 3780 | set_gdbarch_pseudo_register_read (gdbarch, rs6000_pseudo_register_read); |
| 3781 | set_gdbarch_pseudo_register_write (gdbarch, rs6000_pseudo_register_write); |
| 3782 | } |
| 3783 | |
| 3784 | set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1); |
| 3785 | |
| 3786 | /* Select instruction printer. */ |
| 3787 | if (arch == bfd_arch_rs6000) |
| 3788 | set_gdbarch_print_insn (gdbarch, print_insn_rs6000); |
| 3789 | else |
| 3790 | set_gdbarch_print_insn (gdbarch, gdb_print_insn_powerpc); |
| 3791 | |
| 3792 | set_gdbarch_num_regs (gdbarch, PPC_NUM_REGS); |
| 3793 | |
| 3794 | if (have_spe) |
| 3795 | num_pseudoregs += 32; |
| 3796 | if (have_dfp) |
| 3797 | num_pseudoregs += 16; |
| 3798 | if (have_vsx) |
| 3799 | /* Include both VSX and Extended FP registers. */ |
| 3800 | num_pseudoregs += 96; |
| 3801 | |
| 3802 | set_gdbarch_num_pseudo_regs (gdbarch, num_pseudoregs); |
| 3803 | |
| 3804 | set_gdbarch_ptr_bit (gdbarch, wordsize * TARGET_CHAR_BIT); |
| 3805 | set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| 3806 | set_gdbarch_int_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 3807 | set_gdbarch_long_bit (gdbarch, wordsize * TARGET_CHAR_BIT); |
| 3808 | set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT); |
| 3809 | set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 3810 | set_gdbarch_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); |
| 3811 | set_gdbarch_long_double_bit (gdbarch, 16 * TARGET_CHAR_BIT); |
| 3812 | set_gdbarch_char_signed (gdbarch, 0); |
| 3813 | |
| 3814 | set_gdbarch_frame_align (gdbarch, rs6000_frame_align); |
| 3815 | if (wordsize == 8) |
| 3816 | /* PPC64 SYSV. */ |
| 3817 | set_gdbarch_frame_red_zone_size (gdbarch, 288); |
| 3818 | |
| 3819 | set_gdbarch_convert_register_p (gdbarch, rs6000_convert_register_p); |
| 3820 | set_gdbarch_register_to_value (gdbarch, rs6000_register_to_value); |
| 3821 | set_gdbarch_value_to_register (gdbarch, rs6000_value_to_register); |
| 3822 | |
| 3823 | set_gdbarch_stab_reg_to_regnum (gdbarch, rs6000_stab_reg_to_regnum); |
| 3824 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, rs6000_dwarf2_reg_to_regnum); |
| 3825 | |
| 3826 | if (wordsize == 4) |
| 3827 | set_gdbarch_push_dummy_call (gdbarch, ppc_sysv_abi_push_dummy_call); |
| 3828 | else if (wordsize == 8) |
| 3829 | set_gdbarch_push_dummy_call (gdbarch, ppc64_sysv_abi_push_dummy_call); |
| 3830 | |
| 3831 | set_gdbarch_skip_prologue (gdbarch, rs6000_skip_prologue); |
| 3832 | set_gdbarch_in_function_epilogue_p (gdbarch, rs6000_in_function_epilogue_p); |
| 3833 | set_gdbarch_skip_main_prologue (gdbarch, rs6000_skip_main_prologue); |
| 3834 | |
| 3835 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 3836 | set_gdbarch_breakpoint_from_pc (gdbarch, rs6000_breakpoint_from_pc); |
| 3837 | |
| 3838 | /* The value of symbols of type N_SO and N_FUN maybe null when |
| 3839 | it shouldn't be. */ |
| 3840 | set_gdbarch_sofun_address_maybe_missing (gdbarch, 1); |
| 3841 | |
| 3842 | /* Handles single stepping of atomic sequences. */ |
| 3843 | set_gdbarch_software_single_step (gdbarch, ppc_deal_with_atomic_sequence); |
| 3844 | |
| 3845 | /* Not sure on this. FIXMEmgo */ |
| 3846 | set_gdbarch_frame_args_skip (gdbarch, 8); |
| 3847 | |
| 3848 | /* Helpers for function argument information. */ |
| 3849 | set_gdbarch_fetch_pointer_argument (gdbarch, rs6000_fetch_pointer_argument); |
| 3850 | |
| 3851 | /* Trampoline. */ |
| 3852 | set_gdbarch_in_solib_return_trampoline |
| 3853 | (gdbarch, rs6000_in_solib_return_trampoline); |
| 3854 | set_gdbarch_skip_trampoline_code (gdbarch, rs6000_skip_trampoline_code); |
| 3855 | |
| 3856 | /* Hook in the DWARF CFI frame unwinder. */ |
| 3857 | dwarf2_append_unwinders (gdbarch); |
| 3858 | dwarf2_frame_set_adjust_regnum (gdbarch, rs6000_adjust_frame_regnum); |
| 3859 | |
| 3860 | /* Frame handling. */ |
| 3861 | dwarf2_frame_set_init_reg (gdbarch, ppc_dwarf2_frame_init_reg); |
| 3862 | |
| 3863 | /* Setup displaced stepping. */ |
| 3864 | set_gdbarch_displaced_step_copy_insn (gdbarch, |
| 3865 | simple_displaced_step_copy_insn); |
| 3866 | set_gdbarch_displaced_step_fixup (gdbarch, ppc_displaced_step_fixup); |
| 3867 | set_gdbarch_displaced_step_free_closure (gdbarch, |
| 3868 | simple_displaced_step_free_closure); |
| 3869 | set_gdbarch_displaced_step_location (gdbarch, |
| 3870 | displaced_step_at_entry_point); |
| 3871 | |
| 3872 | set_gdbarch_max_insn_length (gdbarch, PPC_INSN_SIZE); |
| 3873 | |
| 3874 | /* Hook in ABI-specific overrides, if they have been registered. */ |
| 3875 | info.target_desc = tdesc; |
| 3876 | info.tdep_info = (void *) tdesc_data; |
| 3877 | gdbarch_init_osabi (info, gdbarch); |
| 3878 | |
| 3879 | switch (info.osabi) |
| 3880 | { |
| 3881 | case GDB_OSABI_LINUX: |
| 3882 | case GDB_OSABI_NETBSD_AOUT: |
| 3883 | case GDB_OSABI_NETBSD_ELF: |
| 3884 | case GDB_OSABI_UNKNOWN: |
| 3885 | set_gdbarch_unwind_pc (gdbarch, rs6000_unwind_pc); |
| 3886 | frame_unwind_append_unwinder (gdbarch, &rs6000_frame_unwind); |
| 3887 | set_gdbarch_dummy_id (gdbarch, rs6000_dummy_id); |
| 3888 | frame_base_append_sniffer (gdbarch, rs6000_frame_base_sniffer); |
| 3889 | break; |
| 3890 | default: |
| 3891 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); |
| 3892 | |
| 3893 | set_gdbarch_unwind_pc (gdbarch, rs6000_unwind_pc); |
| 3894 | frame_unwind_append_unwinder (gdbarch, &rs6000_frame_unwind); |
| 3895 | set_gdbarch_dummy_id (gdbarch, rs6000_dummy_id); |
| 3896 | frame_base_append_sniffer (gdbarch, rs6000_frame_base_sniffer); |
| 3897 | } |
| 3898 | |
| 3899 | set_tdesc_pseudo_register_type (gdbarch, rs6000_pseudo_register_type); |
| 3900 | set_tdesc_pseudo_register_reggroup_p (gdbarch, |
| 3901 | rs6000_pseudo_register_reggroup_p); |
| 3902 | tdesc_use_registers (gdbarch, tdesc, tdesc_data); |
| 3903 | |
| 3904 | /* Override the normal target description method to make the SPE upper |
| 3905 | halves anonymous. */ |
| 3906 | set_gdbarch_register_name (gdbarch, rs6000_register_name); |
| 3907 | |
| 3908 | /* Choose register numbers for all supported pseudo-registers. */ |
| 3909 | tdep->ppc_ev0_regnum = -1; |
| 3910 | tdep->ppc_dl0_regnum = -1; |
| 3911 | tdep->ppc_vsr0_regnum = -1; |
| 3912 | tdep->ppc_efpr0_regnum = -1; |
| 3913 | |
| 3914 | cur_reg = gdbarch_num_regs (gdbarch); |
| 3915 | |
| 3916 | if (have_spe) |
| 3917 | { |
| 3918 | tdep->ppc_ev0_regnum = cur_reg; |
| 3919 | cur_reg += 32; |
| 3920 | } |
| 3921 | if (have_dfp) |
| 3922 | { |
| 3923 | tdep->ppc_dl0_regnum = cur_reg; |
| 3924 | cur_reg += 16; |
| 3925 | } |
| 3926 | if (have_vsx) |
| 3927 | { |
| 3928 | tdep->ppc_vsr0_regnum = cur_reg; |
| 3929 | cur_reg += 64; |
| 3930 | tdep->ppc_efpr0_regnum = cur_reg; |
| 3931 | cur_reg += 32; |
| 3932 | } |
| 3933 | |
| 3934 | gdb_assert (gdbarch_num_regs (gdbarch) |
| 3935 | + gdbarch_num_pseudo_regs (gdbarch) == cur_reg); |
| 3936 | |
| 3937 | return gdbarch; |
| 3938 | } |
| 3939 | |
| 3940 | static void |
| 3941 | rs6000_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) |
| 3942 | { |
| 3943 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 3944 | |
| 3945 | if (tdep == NULL) |
| 3946 | return; |
| 3947 | |
| 3948 | /* FIXME: Dump gdbarch_tdep. */ |
| 3949 | } |
| 3950 | |
| 3951 | /* PowerPC-specific commands. */ |
| 3952 | |
| 3953 | static void |
| 3954 | set_powerpc_command (char *args, int from_tty) |
| 3955 | { |
| 3956 | printf_unfiltered (_("\ |
| 3957 | \"set powerpc\" must be followed by an appropriate subcommand.\n")); |
| 3958 | help_list (setpowerpccmdlist, "set powerpc ", all_commands, gdb_stdout); |
| 3959 | } |
| 3960 | |
| 3961 | static void |
| 3962 | show_powerpc_command (char *args, int from_tty) |
| 3963 | { |
| 3964 | cmd_show_list (showpowerpccmdlist, from_tty, ""); |
| 3965 | } |
| 3966 | |
| 3967 | static void |
| 3968 | powerpc_set_soft_float (char *args, int from_tty, |
| 3969 | struct cmd_list_element *c) |
| 3970 | { |
| 3971 | struct gdbarch_info info; |
| 3972 | |
| 3973 | /* Update the architecture. */ |
| 3974 | gdbarch_info_init (&info); |
| 3975 | if (!gdbarch_update_p (info)) |
| 3976 | internal_error (__FILE__, __LINE__, "could not update architecture"); |
| 3977 | } |
| 3978 | |
| 3979 | static void |
| 3980 | powerpc_set_vector_abi (char *args, int from_tty, |
| 3981 | struct cmd_list_element *c) |
| 3982 | { |
| 3983 | struct gdbarch_info info; |
| 3984 | enum powerpc_vector_abi vector_abi; |
| 3985 | |
| 3986 | for (vector_abi = POWERPC_VEC_AUTO; |
| 3987 | vector_abi != POWERPC_VEC_LAST; |
| 3988 | vector_abi++) |
| 3989 | if (strcmp (powerpc_vector_abi_string, |
| 3990 | powerpc_vector_strings[vector_abi]) == 0) |
| 3991 | { |
| 3992 | powerpc_vector_abi_global = vector_abi; |
| 3993 | break; |
| 3994 | } |
| 3995 | |
| 3996 | if (vector_abi == POWERPC_VEC_LAST) |
| 3997 | internal_error (__FILE__, __LINE__, _("Invalid vector ABI accepted: %s."), |
| 3998 | powerpc_vector_abi_string); |
| 3999 | |
| 4000 | /* Update the architecture. */ |
| 4001 | gdbarch_info_init (&info); |
| 4002 | if (!gdbarch_update_p (info)) |
| 4003 | internal_error (__FILE__, __LINE__, "could not update architecture"); |
| 4004 | } |
| 4005 | |
| 4006 | /* Initialization code. */ |
| 4007 | |
| 4008 | extern initialize_file_ftype _initialize_rs6000_tdep; /* -Wmissing-prototypes */ |
| 4009 | |
| 4010 | void |
| 4011 | _initialize_rs6000_tdep (void) |
| 4012 | { |
| 4013 | gdbarch_register (bfd_arch_rs6000, rs6000_gdbarch_init, rs6000_dump_tdep); |
| 4014 | gdbarch_register (bfd_arch_powerpc, rs6000_gdbarch_init, rs6000_dump_tdep); |
| 4015 | |
| 4016 | /* Initialize the standard target descriptions. */ |
| 4017 | initialize_tdesc_powerpc_32 (); |
| 4018 | initialize_tdesc_powerpc_altivec32 (); |
| 4019 | initialize_tdesc_powerpc_vsx32 (); |
| 4020 | initialize_tdesc_powerpc_403 (); |
| 4021 | initialize_tdesc_powerpc_403gc (); |
| 4022 | initialize_tdesc_powerpc_505 (); |
| 4023 | initialize_tdesc_powerpc_601 (); |
| 4024 | initialize_tdesc_powerpc_602 (); |
| 4025 | initialize_tdesc_powerpc_603 (); |
| 4026 | initialize_tdesc_powerpc_604 (); |
| 4027 | initialize_tdesc_powerpc_64 (); |
| 4028 | initialize_tdesc_powerpc_altivec64 (); |
| 4029 | initialize_tdesc_powerpc_vsx64 (); |
| 4030 | initialize_tdesc_powerpc_7400 (); |
| 4031 | initialize_tdesc_powerpc_750 (); |
| 4032 | initialize_tdesc_powerpc_860 (); |
| 4033 | initialize_tdesc_powerpc_e500 (); |
| 4034 | initialize_tdesc_rs6000 (); |
| 4035 | |
| 4036 | /* Add root prefix command for all "set powerpc"/"show powerpc" |
| 4037 | commands. */ |
| 4038 | add_prefix_cmd ("powerpc", no_class, set_powerpc_command, |
| 4039 | _("Various PowerPC-specific commands."), |
| 4040 | &setpowerpccmdlist, "set powerpc ", 0, &setlist); |
| 4041 | |
| 4042 | add_prefix_cmd ("powerpc", no_class, show_powerpc_command, |
| 4043 | _("Various PowerPC-specific commands."), |
| 4044 | &showpowerpccmdlist, "show powerpc ", 0, &showlist); |
| 4045 | |
| 4046 | /* Add a command to allow the user to force the ABI. */ |
| 4047 | add_setshow_auto_boolean_cmd ("soft-float", class_support, |
| 4048 | &powerpc_soft_float_global, |
| 4049 | _("Set whether to use a soft-float ABI."), |
| 4050 | _("Show whether to use a soft-float ABI."), |
| 4051 | NULL, |
| 4052 | powerpc_set_soft_float, NULL, |
| 4053 | &setpowerpccmdlist, &showpowerpccmdlist); |
| 4054 | |
| 4055 | add_setshow_enum_cmd ("vector-abi", class_support, powerpc_vector_strings, |
| 4056 | &powerpc_vector_abi_string, |
| 4057 | _("Set the vector ABI."), |
| 4058 | _("Show the vector ABI."), |
| 4059 | NULL, powerpc_set_vector_abi, NULL, |
| 4060 | &setpowerpccmdlist, &showpowerpccmdlist); |
| 4061 | } |