| 1 | /* Target-dependent code for SPARC. |
| 2 | |
| 3 | Copyright 2003, 2004 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "arch-utils.h" |
| 24 | #include "dis-asm.h" |
| 25 | #include "floatformat.h" |
| 26 | #include "frame.h" |
| 27 | #include "frame-base.h" |
| 28 | #include "frame-unwind.h" |
| 29 | #include "gdbcore.h" |
| 30 | #include "gdbtypes.h" |
| 31 | #include "inferior.h" |
| 32 | #include "symtab.h" |
| 33 | #include "objfiles.h" |
| 34 | #include "osabi.h" |
| 35 | #include "regcache.h" |
| 36 | #include "target.h" |
| 37 | #include "value.h" |
| 38 | |
| 39 | #include "gdb_assert.h" |
| 40 | #include "gdb_string.h" |
| 41 | |
| 42 | #include "sparc-tdep.h" |
| 43 | |
| 44 | struct regset; |
| 45 | |
| 46 | /* This file implements the SPARC 32-bit ABI as defined by the section |
| 47 | "Low-Level System Information" of the SPARC Compliance Definition |
| 48 | (SCD) 2.4.1, which is the 32-bit System V psABI for SPARC. The SCD |
| 49 | lists changes with respect to the original 32-bit psABI as defined |
| 50 | in the "System V ABI, SPARC Processor Supplement". |
| 51 | |
| 52 | Note that if we talk about SunOS, we mean SunOS 4.x, which was |
| 53 | BSD-based, which is sometimes (retroactively?) referred to as |
| 54 | Solaris 1.x. If we talk about Solaris we mean Solaris 2.x and |
| 55 | above (Solaris 7, 8 and 9 are nothing but Solaris 2.7, 2.8 and 2.9 |
| 56 | suffering from severe version number inflation). Solaris 2.x is |
| 57 | also known as SunOS 5.x, since that's what uname(1) says. Solaris |
| 58 | 2.x is SVR4-based. */ |
| 59 | |
| 60 | /* Please use the sparc32_-prefix for 32-bit specific code, the |
| 61 | sparc64_-prefix for 64-bit specific code and the sparc_-prefix for |
| 62 | code that can handle both. The 64-bit specific code lives in |
| 63 | sparc64-tdep.c; don't add any here. */ |
| 64 | |
| 65 | /* The SPARC Floating-Point Quad-Precision format is similar to |
| 66 | big-endian IA-64 Quad-recision format. */ |
| 67 | #define floatformat_sparc_quad floatformat_ia64_quad_big |
| 68 | |
| 69 | /* The stack pointer is offset from the stack frame by a BIAS of 2047 |
| 70 | (0x7ff) for 64-bit code. BIAS is likely to be defined on SPARC |
| 71 | hosts, so undefine it first. */ |
| 72 | #undef BIAS |
| 73 | #define BIAS 2047 |
| 74 | |
| 75 | /* Macros to extract fields from SPARC instructions. */ |
| 76 | #define X_OP(i) (((i) >> 30) & 0x3) |
| 77 | #define X_RD(i) (((i) >> 25) & 0x1f) |
| 78 | #define X_A(i) (((i) >> 29) & 1) |
| 79 | #define X_COND(i) (((i) >> 25) & 0xf) |
| 80 | #define X_OP2(i) (((i) >> 22) & 0x7) |
| 81 | #define X_IMM22(i) ((i) & 0x3fffff) |
| 82 | #define X_OP3(i) (((i) >> 19) & 0x3f) |
| 83 | #define X_RS1(i) (((i) >> 14) & 0x1f) |
| 84 | #define X_I(i) (((i) >> 13) & 1) |
| 85 | /* Sign extension macros. */ |
| 86 | #define X_DISP22(i) ((X_IMM22 (i) ^ 0x200000) - 0x200000) |
| 87 | #define X_DISP19(i) ((((i) & 0x7ffff) ^ 0x40000) - 0x40000) |
| 88 | #define X_SIMM13(i) ((((i) & 0x1fff) ^ 0x1000) - 0x1000) |
| 89 | |
| 90 | /* Fetch the instruction at PC. Instructions are always big-endian |
| 91 | even if the processor operates in little-endian mode. */ |
| 92 | |
| 93 | unsigned long |
| 94 | sparc_fetch_instruction (CORE_ADDR pc) |
| 95 | { |
| 96 | unsigned char buf[4]; |
| 97 | unsigned long insn; |
| 98 | int i; |
| 99 | |
| 100 | /* If we can't read the instruction at PC, return zero. */ |
| 101 | if (target_read_memory (pc, buf, sizeof (buf))) |
| 102 | return 0; |
| 103 | |
| 104 | insn = 0; |
| 105 | for (i = 0; i < sizeof (buf); i++) |
| 106 | insn = (insn << 8) | buf[i]; |
| 107 | return insn; |
| 108 | } |
| 109 | \f |
| 110 | |
| 111 | /* Return non-zero if the instruction corresponding to PC is an "unimp" |
| 112 | instruction. */ |
| 113 | |
| 114 | static int |
| 115 | sparc_is_unimp_insn (CORE_ADDR pc) |
| 116 | { |
| 117 | const unsigned long insn = sparc_fetch_instruction (pc); |
| 118 | |
| 119 | return ((insn & 0xc1c00000) == 0); |
| 120 | } |
| 121 | |
| 122 | /* OpenBSD/sparc includes StackGhost, which according to the author's |
| 123 | website http://stackghost.cerias.purdue.edu "... transparently and |
| 124 | automatically protects applications' stack frames; more |
| 125 | specifically, it guards the return pointers. The protection |
| 126 | mechanisms require no application source or binary modification and |
| 127 | imposes only a negligible performance penalty." |
| 128 | |
| 129 | The same website provides the following description of how |
| 130 | StackGhost works: |
| 131 | |
| 132 | "StackGhost interfaces with the kernel trap handler that would |
| 133 | normally write out registers to the stack and the handler that |
| 134 | would read them back in. By XORing a cookie into the |
| 135 | return-address saved in the user stack when it is actually written |
| 136 | to the stack, and then XOR it out when the return-address is pulled |
| 137 | from the stack, StackGhost can cause attacker corrupted return |
| 138 | pointers to behave in a manner the attacker cannot predict. |
| 139 | StackGhost can also use several unused bits in the return pointer |
| 140 | to detect a smashed return pointer and abort the process." |
| 141 | |
| 142 | For GDB this means that whenever we're reading %i7 from a stack |
| 143 | frame's window save area, we'll have to XOR the cookie. |
| 144 | |
| 145 | More information on StackGuard can be found on in: |
| 146 | |
| 147 | Mike Frantzen and Mike Shuey. "StackGhost: Hardware Facilitated |
| 148 | Stack Protection." 2001. Published in USENIX Security Symposium |
| 149 | '01. */ |
| 150 | |
| 151 | /* Fetch StackGhost Per-Process XOR cookie. */ |
| 152 | |
| 153 | ULONGEST |
| 154 | sparc_fetch_wcookie (void) |
| 155 | { |
| 156 | struct target_ops *ops = ¤t_target; |
| 157 | char buf[8]; |
| 158 | int len; |
| 159 | |
| 160 | len = target_read_partial (ops, TARGET_OBJECT_WCOOKIE, NULL, buf, 0, 8); |
| 161 | if (len == -1) |
| 162 | return 0; |
| 163 | |
| 164 | /* We should have either an 32-bit or an 64-bit cookie. */ |
| 165 | gdb_assert (len == 4 || len == 8); |
| 166 | |
| 167 | return extract_unsigned_integer (buf, len); |
| 168 | } |
| 169 | \f |
| 170 | |
| 171 | /* Return the contents if register REGNUM as an address. */ |
| 172 | |
| 173 | static CORE_ADDR |
| 174 | sparc_address_from_register (int regnum) |
| 175 | { |
| 176 | ULONGEST addr; |
| 177 | |
| 178 | regcache_cooked_read_unsigned (current_regcache, regnum, &addr); |
| 179 | return addr; |
| 180 | } |
| 181 | \f |
| 182 | |
| 183 | /* The functions on this page are intended to be used to classify |
| 184 | function arguments. */ |
| 185 | |
| 186 | /* Check whether TYPE is "Integral or Pointer". */ |
| 187 | |
| 188 | static int |
| 189 | sparc_integral_or_pointer_p (const struct type *type) |
| 190 | { |
| 191 | int len = TYPE_LENGTH (type); |
| 192 | |
| 193 | switch (TYPE_CODE (type)) |
| 194 | { |
| 195 | case TYPE_CODE_INT: |
| 196 | case TYPE_CODE_BOOL: |
| 197 | case TYPE_CODE_CHAR: |
| 198 | case TYPE_CODE_ENUM: |
| 199 | case TYPE_CODE_RANGE: |
| 200 | /* We have byte, half-word, word and extended-word/doubleword |
| 201 | integral types. The doubleword is an extension to the |
| 202 | original 32-bit ABI by the SCD 2.4.x. */ |
| 203 | return (len == 1 || len == 2 || len == 4 || len == 8); |
| 204 | case TYPE_CODE_PTR: |
| 205 | case TYPE_CODE_REF: |
| 206 | /* Allow either 32-bit or 64-bit pointers. */ |
| 207 | return (len == 4 || len == 8); |
| 208 | default: |
| 209 | break; |
| 210 | } |
| 211 | |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | /* Check whether TYPE is "Floating". */ |
| 216 | |
| 217 | static int |
| 218 | sparc_floating_p (const struct type *type) |
| 219 | { |
| 220 | switch (TYPE_CODE (type)) |
| 221 | { |
| 222 | case TYPE_CODE_FLT: |
| 223 | { |
| 224 | int len = TYPE_LENGTH (type); |
| 225 | return (len == 4 || len == 8 || len == 16); |
| 226 | } |
| 227 | default: |
| 228 | break; |
| 229 | } |
| 230 | |
| 231 | return 0; |
| 232 | } |
| 233 | |
| 234 | /* Check whether TYPE is "Structure or Union". */ |
| 235 | |
| 236 | static int |
| 237 | sparc_structure_or_union_p (const struct type *type) |
| 238 | { |
| 239 | switch (TYPE_CODE (type)) |
| 240 | { |
| 241 | case TYPE_CODE_STRUCT: |
| 242 | case TYPE_CODE_UNION: |
| 243 | return 1; |
| 244 | default: |
| 245 | break; |
| 246 | } |
| 247 | |
| 248 | return 0; |
| 249 | } |
| 250 | |
| 251 | /* Register information. */ |
| 252 | |
| 253 | static const char *sparc32_register_names[] = |
| 254 | { |
| 255 | "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7", |
| 256 | "o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7", |
| 257 | "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7", |
| 258 | "i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7", |
| 259 | |
| 260 | "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", |
| 261 | "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", |
| 262 | "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", |
| 263 | "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", |
| 264 | |
| 265 | "y", "psr", "wim", "tbr", "pc", "npc", "fsr", "csr" |
| 266 | }; |
| 267 | |
| 268 | /* Total number of registers. */ |
| 269 | #define SPARC32_NUM_REGS ARRAY_SIZE (sparc32_register_names) |
| 270 | |
| 271 | /* We provide the aliases %d0..%d30 for the floating registers as |
| 272 | "psuedo" registers. */ |
| 273 | |
| 274 | static const char *sparc32_pseudo_register_names[] = |
| 275 | { |
| 276 | "d0", "d2", "d4", "d6", "d8", "d10", "d12", "d14", |
| 277 | "d16", "d18", "d20", "d22", "d24", "d26", "d28", "d30" |
| 278 | }; |
| 279 | |
| 280 | /* Total number of pseudo registers. */ |
| 281 | #define SPARC32_NUM_PSEUDO_REGS ARRAY_SIZE (sparc32_pseudo_register_names) |
| 282 | |
| 283 | /* Return the name of register REGNUM. */ |
| 284 | |
| 285 | static const char * |
| 286 | sparc32_register_name (int regnum) |
| 287 | { |
| 288 | if (regnum >= 0 && regnum < SPARC32_NUM_REGS) |
| 289 | return sparc32_register_names[regnum]; |
| 290 | |
| 291 | if (regnum < SPARC32_NUM_REGS + SPARC32_NUM_PSEUDO_REGS) |
| 292 | return sparc32_pseudo_register_names[regnum - SPARC32_NUM_REGS]; |
| 293 | |
| 294 | return NULL; |
| 295 | } |
| 296 | |
| 297 | /* Return the GDB type object for the "standard" data type of data in |
| 298 | register REGNUM. */ |
| 299 | |
| 300 | static struct type * |
| 301 | sparc32_register_type (struct gdbarch *gdbarch, int regnum) |
| 302 | { |
| 303 | if (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM) |
| 304 | return builtin_type_float; |
| 305 | |
| 306 | if (regnum >= SPARC32_D0_REGNUM && regnum <= SPARC32_D30_REGNUM) |
| 307 | return builtin_type_double; |
| 308 | |
| 309 | if (regnum == SPARC_SP_REGNUM || regnum == SPARC_FP_REGNUM) |
| 310 | return builtin_type_void_data_ptr; |
| 311 | |
| 312 | if (regnum == SPARC32_PC_REGNUM || regnum == SPARC32_NPC_REGNUM) |
| 313 | return builtin_type_void_func_ptr; |
| 314 | |
| 315 | return builtin_type_int32; |
| 316 | } |
| 317 | |
| 318 | static void |
| 319 | sparc32_pseudo_register_read (struct gdbarch *gdbarch, |
| 320 | struct regcache *regcache, |
| 321 | int regnum, void *buf) |
| 322 | { |
| 323 | gdb_assert (regnum >= SPARC32_D0_REGNUM && regnum <= SPARC32_D30_REGNUM); |
| 324 | |
| 325 | regnum = SPARC_F0_REGNUM + 2 * (regnum - SPARC32_D0_REGNUM); |
| 326 | regcache_raw_read (regcache, regnum, buf); |
| 327 | regcache_raw_read (regcache, regnum + 1, ((char *)buf) + 4); |
| 328 | } |
| 329 | |
| 330 | static void |
| 331 | sparc32_pseudo_register_write (struct gdbarch *gdbarch, |
| 332 | struct regcache *regcache, |
| 333 | int regnum, const void *buf) |
| 334 | { |
| 335 | gdb_assert (regnum >= SPARC32_D0_REGNUM && regnum <= SPARC32_D30_REGNUM); |
| 336 | |
| 337 | regnum = SPARC_F0_REGNUM + 2 * (regnum - SPARC32_D0_REGNUM); |
| 338 | regcache_raw_write (regcache, regnum, buf); |
| 339 | regcache_raw_write (regcache, regnum + 1, ((const char *)buf) + 4); |
| 340 | } |
| 341 | \f |
| 342 | |
| 343 | static CORE_ADDR |
| 344 | sparc32_push_dummy_code (struct gdbarch *gdbarch, CORE_ADDR sp, |
| 345 | CORE_ADDR funcaddr, int using_gcc, |
| 346 | struct value **args, int nargs, |
| 347 | struct type *value_type, |
| 348 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr) |
| 349 | { |
| 350 | *bp_addr = sp - 4; |
| 351 | *real_pc = funcaddr; |
| 352 | |
| 353 | if (using_struct_return (value_type, using_gcc)) |
| 354 | { |
| 355 | char buf[4]; |
| 356 | |
| 357 | /* This is an UNIMP instruction. */ |
| 358 | store_unsigned_integer (buf, 4, TYPE_LENGTH (value_type) & 0x1fff); |
| 359 | write_memory (sp - 8, buf, 4); |
| 360 | return sp - 8; |
| 361 | } |
| 362 | |
| 363 | return sp - 4; |
| 364 | } |
| 365 | |
| 366 | static CORE_ADDR |
| 367 | sparc32_store_arguments (struct regcache *regcache, int nargs, |
| 368 | struct value **args, CORE_ADDR sp, |
| 369 | int struct_return, CORE_ADDR struct_addr) |
| 370 | { |
| 371 | /* Number of words in the "parameter array". */ |
| 372 | int num_elements = 0; |
| 373 | int element = 0; |
| 374 | int i; |
| 375 | |
| 376 | for (i = 0; i < nargs; i++) |
| 377 | { |
| 378 | struct type *type = value_type (args[i]); |
| 379 | int len = TYPE_LENGTH (type); |
| 380 | |
| 381 | if (sparc_structure_or_union_p (type) |
| 382 | || (sparc_floating_p (type) && len == 16)) |
| 383 | { |
| 384 | /* Structure, Union and Quad-Precision Arguments. */ |
| 385 | sp -= len; |
| 386 | |
| 387 | /* Use doubleword alignment for these values. That's always |
| 388 | correct, and wasting a few bytes shouldn't be a problem. */ |
| 389 | sp &= ~0x7; |
| 390 | |
| 391 | write_memory (sp, VALUE_CONTENTS (args[i]), len); |
| 392 | args[i] = value_from_pointer (lookup_pointer_type (type), sp); |
| 393 | num_elements++; |
| 394 | } |
| 395 | else if (sparc_floating_p (type)) |
| 396 | { |
| 397 | /* Floating arguments. */ |
| 398 | gdb_assert (len == 4 || len == 8); |
| 399 | num_elements += (len / 4); |
| 400 | } |
| 401 | else |
| 402 | { |
| 403 | /* Integral and pointer arguments. */ |
| 404 | gdb_assert (sparc_integral_or_pointer_p (type)); |
| 405 | |
| 406 | if (len < 4) |
| 407 | args[i] = value_cast (builtin_type_int32, args[i]); |
| 408 | num_elements += ((len + 3) / 4); |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | /* Always allocate at least six words. */ |
| 413 | sp -= max (6, num_elements) * 4; |
| 414 | |
| 415 | /* The psABI says that "Software convention requires space for the |
| 416 | struct/union return value pointer, even if the word is unused." */ |
| 417 | sp -= 4; |
| 418 | |
| 419 | /* The psABI says that "Although software convention and the |
| 420 | operating system require every stack frame to be doubleword |
| 421 | aligned." */ |
| 422 | sp &= ~0x7; |
| 423 | |
| 424 | for (i = 0; i < nargs; i++) |
| 425 | { |
| 426 | char *valbuf = VALUE_CONTENTS (args[i]); |
| 427 | struct type *type = value_type (args[i]); |
| 428 | int len = TYPE_LENGTH (type); |
| 429 | |
| 430 | gdb_assert (len == 4 || len == 8); |
| 431 | |
| 432 | if (element < 6) |
| 433 | { |
| 434 | int regnum = SPARC_O0_REGNUM + element; |
| 435 | |
| 436 | regcache_cooked_write (regcache, regnum, valbuf); |
| 437 | if (len > 4 && element < 5) |
| 438 | regcache_cooked_write (regcache, regnum + 1, valbuf + 4); |
| 439 | } |
| 440 | |
| 441 | /* Always store the argument in memory. */ |
| 442 | write_memory (sp + 4 + element * 4, valbuf, len); |
| 443 | element += len / 4; |
| 444 | } |
| 445 | |
| 446 | gdb_assert (element == num_elements); |
| 447 | |
| 448 | if (struct_return) |
| 449 | { |
| 450 | char buf[4]; |
| 451 | |
| 452 | store_unsigned_integer (buf, 4, struct_addr); |
| 453 | write_memory (sp, buf, 4); |
| 454 | } |
| 455 | |
| 456 | return sp; |
| 457 | } |
| 458 | |
| 459 | static CORE_ADDR |
| 460 | sparc32_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
| 461 | struct regcache *regcache, CORE_ADDR bp_addr, |
| 462 | int nargs, struct value **args, CORE_ADDR sp, |
| 463 | int struct_return, CORE_ADDR struct_addr) |
| 464 | { |
| 465 | CORE_ADDR call_pc = (struct_return ? (bp_addr - 12) : (bp_addr - 8)); |
| 466 | |
| 467 | /* Set return address. */ |
| 468 | regcache_cooked_write_unsigned (regcache, SPARC_O7_REGNUM, call_pc); |
| 469 | |
| 470 | /* Set up function arguments. */ |
| 471 | sp = sparc32_store_arguments (regcache, nargs, args, sp, |
| 472 | struct_return, struct_addr); |
| 473 | |
| 474 | /* Allocate the 16-word window save area. */ |
| 475 | sp -= 16 * 4; |
| 476 | |
| 477 | /* Stack should be doubleword aligned at this point. */ |
| 478 | gdb_assert (sp % 8 == 0); |
| 479 | |
| 480 | /* Finally, update the stack pointer. */ |
| 481 | regcache_cooked_write_unsigned (regcache, SPARC_SP_REGNUM, sp); |
| 482 | |
| 483 | return sp; |
| 484 | } |
| 485 | \f |
| 486 | |
| 487 | /* Use the program counter to determine the contents and size of a |
| 488 | breakpoint instruction. Return a pointer to a string of bytes that |
| 489 | encode a breakpoint instruction, store the length of the string in |
| 490 | *LEN and optionally adjust *PC to point to the correct memory |
| 491 | location for inserting the breakpoint. */ |
| 492 | |
| 493 | static const unsigned char * |
| 494 | sparc_breakpoint_from_pc (CORE_ADDR *pc, int *len) |
| 495 | { |
| 496 | static unsigned char break_insn[] = { 0x91, 0xd0, 0x20, 0x01 }; |
| 497 | |
| 498 | *len = sizeof (break_insn); |
| 499 | return break_insn; |
| 500 | } |
| 501 | \f |
| 502 | |
| 503 | /* Allocate and initialize a frame cache. */ |
| 504 | |
| 505 | static struct sparc_frame_cache * |
| 506 | sparc_alloc_frame_cache (void) |
| 507 | { |
| 508 | struct sparc_frame_cache *cache; |
| 509 | int i; |
| 510 | |
| 511 | cache = FRAME_OBSTACK_ZALLOC (struct sparc_frame_cache); |
| 512 | |
| 513 | /* Base address. */ |
| 514 | cache->base = 0; |
| 515 | cache->pc = 0; |
| 516 | |
| 517 | /* Frameless until proven otherwise. */ |
| 518 | cache->frameless_p = 1; |
| 519 | |
| 520 | cache->struct_return_p = 0; |
| 521 | |
| 522 | return cache; |
| 523 | } |
| 524 | |
| 525 | CORE_ADDR |
| 526 | sparc_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc, |
| 527 | struct sparc_frame_cache *cache) |
| 528 | { |
| 529 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 530 | unsigned long insn; |
| 531 | int offset = 0; |
| 532 | int dest = -1; |
| 533 | |
| 534 | if (current_pc <= pc) |
| 535 | return current_pc; |
| 536 | |
| 537 | /* We have to handle to "Procedure Linkage Table" (PLT) special. On |
| 538 | SPARC the linker usually defines a symbol (typically |
| 539 | _PROCEDURE_LINKAGE_TABLE_) at the start of the .plt section. |
| 540 | This symbol makes us end up here with PC pointing at the start of |
| 541 | the PLT and CURRENT_PC probably pointing at a PLT entry. If we |
| 542 | would do our normal prologue analysis, we would probably conclude |
| 543 | that we've got a frame when in reality we don't, since the |
| 544 | dynamic linker patches up the first PLT with some code that |
| 545 | starts with a SAVE instruction. Patch up PC such that it points |
| 546 | at the start of our PLT entry. */ |
| 547 | if (tdep->plt_entry_size > 0 && in_plt_section (current_pc, NULL)) |
| 548 | pc = current_pc - ((current_pc - pc) % tdep->plt_entry_size); |
| 549 | |
| 550 | insn = sparc_fetch_instruction (pc); |
| 551 | |
| 552 | /* Recognize a SETHI insn and record its destination. */ |
| 553 | if (X_OP (insn) == 0 && X_OP2 (insn) == 0x04) |
| 554 | { |
| 555 | dest = X_RD (insn); |
| 556 | offset += 4; |
| 557 | |
| 558 | insn = sparc_fetch_instruction (pc + 4); |
| 559 | } |
| 560 | |
| 561 | /* Allow for an arithmetic operation on DEST or %g1. */ |
| 562 | if (X_OP (insn) == 2 && X_I (insn) |
| 563 | && (X_RD (insn) == 1 || X_RD (insn) == dest)) |
| 564 | { |
| 565 | offset += 4; |
| 566 | |
| 567 | insn = sparc_fetch_instruction (pc + 8); |
| 568 | } |
| 569 | |
| 570 | /* Check for the SAVE instruction that sets up the frame. */ |
| 571 | if (X_OP (insn) == 2 && X_OP3 (insn) == 0x3c) |
| 572 | { |
| 573 | cache->frameless_p = 0; |
| 574 | return pc + offset + 4; |
| 575 | } |
| 576 | |
| 577 | return pc; |
| 578 | } |
| 579 | |
| 580 | static CORE_ADDR |
| 581 | sparc_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 582 | { |
| 583 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 584 | return frame_unwind_register_unsigned (next_frame, tdep->pc_regnum); |
| 585 | } |
| 586 | |
| 587 | /* Return PC of first real instruction of the function starting at |
| 588 | START_PC. */ |
| 589 | |
| 590 | static CORE_ADDR |
| 591 | sparc32_skip_prologue (CORE_ADDR start_pc) |
| 592 | { |
| 593 | struct symtab_and_line sal; |
| 594 | CORE_ADDR func_start, func_end; |
| 595 | struct sparc_frame_cache cache; |
| 596 | |
| 597 | /* This is the preferred method, find the end of the prologue by |
| 598 | using the debugging information. */ |
| 599 | if (find_pc_partial_function (start_pc, NULL, &func_start, &func_end)) |
| 600 | { |
| 601 | sal = find_pc_line (func_start, 0); |
| 602 | |
| 603 | if (sal.end < func_end |
| 604 | && start_pc <= sal.end) |
| 605 | return sal.end; |
| 606 | } |
| 607 | |
| 608 | start_pc = sparc_analyze_prologue (start_pc, 0xffffffffUL, &cache); |
| 609 | |
| 610 | /* The psABI says that "Although the first 6 words of arguments |
| 611 | reside in registers, the standard stack frame reserves space for |
| 612 | them.". It also suggests that a function may use that space to |
| 613 | "write incoming arguments 0 to 5" into that space, and that's |
| 614 | indeed what GCC seems to be doing. In that case GCC will |
| 615 | generate debug information that points to the stack slots instead |
| 616 | of the registers, so we should consider the instructions that |
| 617 | write out these incoming arguments onto the stack. Of course we |
| 618 | only need to do this if we have a stack frame. */ |
| 619 | |
| 620 | while (!cache.frameless_p) |
| 621 | { |
| 622 | unsigned long insn = sparc_fetch_instruction (start_pc); |
| 623 | |
| 624 | /* Recognize instructions that store incoming arguments in |
| 625 | %i0...%i5 into the corresponding stack slot. */ |
| 626 | if (X_OP (insn) == 3 && (X_OP3 (insn) & 0x3c) == 0x04 && X_I (insn) |
| 627 | && (X_RD (insn) >= 24 && X_RD (insn) <= 29) && X_RS1 (insn) == 30 |
| 628 | && X_SIMM13 (insn) == 68 + (X_RD (insn) - 24) * 4) |
| 629 | { |
| 630 | start_pc += 4; |
| 631 | continue; |
| 632 | } |
| 633 | |
| 634 | break; |
| 635 | } |
| 636 | |
| 637 | return start_pc; |
| 638 | } |
| 639 | |
| 640 | /* Normal frames. */ |
| 641 | |
| 642 | struct sparc_frame_cache * |
| 643 | sparc_frame_cache (struct frame_info *next_frame, void **this_cache) |
| 644 | { |
| 645 | struct sparc_frame_cache *cache; |
| 646 | |
| 647 | if (*this_cache) |
| 648 | return *this_cache; |
| 649 | |
| 650 | cache = sparc_alloc_frame_cache (); |
| 651 | *this_cache = cache; |
| 652 | |
| 653 | cache->pc = frame_func_unwind (next_frame); |
| 654 | if (cache->pc != 0) |
| 655 | { |
| 656 | CORE_ADDR addr_in_block = frame_unwind_address_in_block (next_frame); |
| 657 | sparc_analyze_prologue (cache->pc, addr_in_block, cache); |
| 658 | } |
| 659 | |
| 660 | if (cache->frameless_p) |
| 661 | { |
| 662 | /* This function is frameless, so %fp (%i6) holds the frame |
| 663 | pointer for our calling frame. Use %sp (%o6) as this frame's |
| 664 | base address. */ |
| 665 | cache->base = |
| 666 | frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM); |
| 667 | } |
| 668 | else |
| 669 | { |
| 670 | /* For normal frames, %fp (%i6) holds the frame pointer, the |
| 671 | base address for the current stack frame. */ |
| 672 | cache->base = |
| 673 | frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM); |
| 674 | } |
| 675 | |
| 676 | return cache; |
| 677 | } |
| 678 | |
| 679 | struct sparc_frame_cache * |
| 680 | sparc32_frame_cache (struct frame_info *next_frame, void **this_cache) |
| 681 | { |
| 682 | struct sparc_frame_cache *cache; |
| 683 | struct symbol *sym; |
| 684 | |
| 685 | if (*this_cache) |
| 686 | return *this_cache; |
| 687 | |
| 688 | cache = sparc_frame_cache (next_frame, this_cache); |
| 689 | |
| 690 | sym = find_pc_function (cache->pc); |
| 691 | if (sym) |
| 692 | { |
| 693 | struct type *type = check_typedef (SYMBOL_TYPE (sym)); |
| 694 | enum type_code code = TYPE_CODE (type); |
| 695 | |
| 696 | if (code == TYPE_CODE_FUNC || code == TYPE_CODE_METHOD) |
| 697 | { |
| 698 | type = check_typedef (TYPE_TARGET_TYPE (type)); |
| 699 | if (sparc_structure_or_union_p (type) |
| 700 | || (sparc_floating_p (type) && TYPE_LENGTH (type) == 16)) |
| 701 | cache->struct_return_p = 1; |
| 702 | } |
| 703 | } |
| 704 | else |
| 705 | { |
| 706 | /* There is no debugging information for this function to |
| 707 | help us determine whether this function returns a struct |
| 708 | or not. So we rely on another heuristic which is to check |
| 709 | the instruction at the return address and see if this is |
| 710 | an "unimp" instruction. If it is, then it is a struct-return |
| 711 | function. */ |
| 712 | CORE_ADDR pc; |
| 713 | int regnum = cache->frameless_p ? SPARC_O7_REGNUM : SPARC_I7_REGNUM; |
| 714 | |
| 715 | pc = frame_unwind_register_unsigned (next_frame, regnum) + 8; |
| 716 | if (sparc_is_unimp_insn (pc)) |
| 717 | cache->struct_return_p = 1; |
| 718 | } |
| 719 | |
| 720 | return cache; |
| 721 | } |
| 722 | |
| 723 | static void |
| 724 | sparc32_frame_this_id (struct frame_info *next_frame, void **this_cache, |
| 725 | struct frame_id *this_id) |
| 726 | { |
| 727 | struct sparc_frame_cache *cache = |
| 728 | sparc32_frame_cache (next_frame, this_cache); |
| 729 | |
| 730 | /* This marks the outermost frame. */ |
| 731 | if (cache->base == 0) |
| 732 | return; |
| 733 | |
| 734 | (*this_id) = frame_id_build (cache->base, cache->pc); |
| 735 | } |
| 736 | |
| 737 | static void |
| 738 | sparc32_frame_prev_register (struct frame_info *next_frame, void **this_cache, |
| 739 | int regnum, int *optimizedp, |
| 740 | enum lval_type *lvalp, CORE_ADDR *addrp, |
| 741 | int *realnump, void *valuep) |
| 742 | { |
| 743 | struct sparc_frame_cache *cache = |
| 744 | sparc32_frame_cache (next_frame, this_cache); |
| 745 | |
| 746 | if (regnum == SPARC32_PC_REGNUM || regnum == SPARC32_NPC_REGNUM) |
| 747 | { |
| 748 | *optimizedp = 0; |
| 749 | *lvalp = not_lval; |
| 750 | *addrp = 0; |
| 751 | *realnump = -1; |
| 752 | if (valuep) |
| 753 | { |
| 754 | CORE_ADDR pc = (regnum == SPARC32_NPC_REGNUM) ? 4 : 0; |
| 755 | |
| 756 | /* If this functions has a Structure, Union or |
| 757 | Quad-Precision return value, we have to skip the UNIMP |
| 758 | instruction that encodes the size of the structure. */ |
| 759 | if (cache->struct_return_p) |
| 760 | pc += 4; |
| 761 | |
| 762 | regnum = cache->frameless_p ? SPARC_O7_REGNUM : SPARC_I7_REGNUM; |
| 763 | pc += frame_unwind_register_unsigned (next_frame, regnum) + 8; |
| 764 | store_unsigned_integer (valuep, 4, pc); |
| 765 | } |
| 766 | return; |
| 767 | } |
| 768 | |
| 769 | /* Handle StackGhost. */ |
| 770 | { |
| 771 | ULONGEST wcookie = sparc_fetch_wcookie (); |
| 772 | |
| 773 | if (wcookie != 0 && !cache->frameless_p && regnum == SPARC_I7_REGNUM) |
| 774 | { |
| 775 | *optimizedp = 0; |
| 776 | *lvalp = not_lval; |
| 777 | *addrp = 0; |
| 778 | *realnump = -1; |
| 779 | if (valuep) |
| 780 | { |
| 781 | CORE_ADDR addr = cache->base + (regnum - SPARC_L0_REGNUM) * 4; |
| 782 | ULONGEST i7; |
| 783 | |
| 784 | /* Read the value in from memory. */ |
| 785 | i7 = get_frame_memory_unsigned (next_frame, addr, 4); |
| 786 | store_unsigned_integer (valuep, 4, i7 ^ wcookie); |
| 787 | } |
| 788 | return; |
| 789 | } |
| 790 | } |
| 791 | |
| 792 | /* The previous frame's `local' and `in' registers have been saved |
| 793 | in the register save area. */ |
| 794 | if (!cache->frameless_p |
| 795 | && regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM) |
| 796 | { |
| 797 | *optimizedp = 0; |
| 798 | *lvalp = lval_memory; |
| 799 | *addrp = cache->base + (regnum - SPARC_L0_REGNUM) * 4; |
| 800 | *realnump = -1; |
| 801 | if (valuep) |
| 802 | { |
| 803 | struct gdbarch *gdbarch = get_frame_arch (next_frame); |
| 804 | |
| 805 | /* Read the value in from memory. */ |
| 806 | read_memory (*addrp, valuep, register_size (gdbarch, regnum)); |
| 807 | } |
| 808 | return; |
| 809 | } |
| 810 | |
| 811 | /* The previous frame's `out' registers are accessable as the |
| 812 | current frame's `in' registers. */ |
| 813 | if (!cache->frameless_p |
| 814 | && regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM) |
| 815 | regnum += (SPARC_I0_REGNUM - SPARC_O0_REGNUM); |
| 816 | |
| 817 | *optimizedp = 0; |
| 818 | *lvalp = lval_register; |
| 819 | *addrp = 0; |
| 820 | *realnump = regnum; |
| 821 | if (valuep) |
| 822 | frame_unwind_register (next_frame, (*realnump), valuep); |
| 823 | } |
| 824 | |
| 825 | static const struct frame_unwind sparc32_frame_unwind = |
| 826 | { |
| 827 | NORMAL_FRAME, |
| 828 | sparc32_frame_this_id, |
| 829 | sparc32_frame_prev_register |
| 830 | }; |
| 831 | |
| 832 | static const struct frame_unwind * |
| 833 | sparc32_frame_sniffer (struct frame_info *next_frame) |
| 834 | { |
| 835 | return &sparc32_frame_unwind; |
| 836 | } |
| 837 | \f |
| 838 | |
| 839 | static CORE_ADDR |
| 840 | sparc32_frame_base_address (struct frame_info *next_frame, void **this_cache) |
| 841 | { |
| 842 | struct sparc_frame_cache *cache = |
| 843 | sparc32_frame_cache (next_frame, this_cache); |
| 844 | |
| 845 | return cache->base; |
| 846 | } |
| 847 | |
| 848 | static const struct frame_base sparc32_frame_base = |
| 849 | { |
| 850 | &sparc32_frame_unwind, |
| 851 | sparc32_frame_base_address, |
| 852 | sparc32_frame_base_address, |
| 853 | sparc32_frame_base_address |
| 854 | }; |
| 855 | |
| 856 | static struct frame_id |
| 857 | sparc_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 858 | { |
| 859 | CORE_ADDR sp; |
| 860 | |
| 861 | sp = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM); |
| 862 | return frame_id_build (sp, frame_pc_unwind (next_frame)); |
| 863 | } |
| 864 | \f |
| 865 | |
| 866 | /* Extract from an array REGBUF containing the (raw) register state, a |
| 867 | function return value of TYPE, and copy that into VALBUF. */ |
| 868 | |
| 869 | static void |
| 870 | sparc32_extract_return_value (struct type *type, struct regcache *regcache, |
| 871 | void *valbuf) |
| 872 | { |
| 873 | int len = TYPE_LENGTH (type); |
| 874 | char buf[8]; |
| 875 | |
| 876 | gdb_assert (!sparc_structure_or_union_p (type)); |
| 877 | gdb_assert (!(sparc_floating_p (type) && len == 16)); |
| 878 | |
| 879 | if (sparc_floating_p (type)) |
| 880 | { |
| 881 | /* Floating return values. */ |
| 882 | regcache_cooked_read (regcache, SPARC_F0_REGNUM, buf); |
| 883 | if (len > 4) |
| 884 | regcache_cooked_read (regcache, SPARC_F1_REGNUM, buf + 4); |
| 885 | memcpy (valbuf, buf, len); |
| 886 | } |
| 887 | else |
| 888 | { |
| 889 | /* Integral and pointer return values. */ |
| 890 | gdb_assert (sparc_integral_or_pointer_p (type)); |
| 891 | |
| 892 | regcache_cooked_read (regcache, SPARC_O0_REGNUM, buf); |
| 893 | if (len > 4) |
| 894 | { |
| 895 | regcache_cooked_read (regcache, SPARC_O1_REGNUM, buf + 4); |
| 896 | gdb_assert (len == 8); |
| 897 | memcpy (valbuf, buf, 8); |
| 898 | } |
| 899 | else |
| 900 | { |
| 901 | /* Just stripping off any unused bytes should preserve the |
| 902 | signed-ness just fine. */ |
| 903 | memcpy (valbuf, buf + 4 - len, len); |
| 904 | } |
| 905 | } |
| 906 | } |
| 907 | |
| 908 | /* Write into the appropriate registers a function return value stored |
| 909 | in VALBUF of type TYPE. */ |
| 910 | |
| 911 | static void |
| 912 | sparc32_store_return_value (struct type *type, struct regcache *regcache, |
| 913 | const void *valbuf) |
| 914 | { |
| 915 | int len = TYPE_LENGTH (type); |
| 916 | char buf[8]; |
| 917 | |
| 918 | gdb_assert (!sparc_structure_or_union_p (type)); |
| 919 | gdb_assert (!(sparc_floating_p (type) && len == 16)); |
| 920 | |
| 921 | if (sparc_floating_p (type)) |
| 922 | { |
| 923 | /* Floating return values. */ |
| 924 | memcpy (buf, valbuf, len); |
| 925 | regcache_cooked_write (regcache, SPARC_F0_REGNUM, buf); |
| 926 | if (len > 4) |
| 927 | regcache_cooked_write (regcache, SPARC_F1_REGNUM, buf + 4); |
| 928 | } |
| 929 | else |
| 930 | { |
| 931 | /* Integral and pointer return values. */ |
| 932 | gdb_assert (sparc_integral_or_pointer_p (type)); |
| 933 | |
| 934 | if (len > 4) |
| 935 | { |
| 936 | gdb_assert (len == 8); |
| 937 | memcpy (buf, valbuf, 8); |
| 938 | regcache_cooked_write (regcache, SPARC_O1_REGNUM, buf + 4); |
| 939 | } |
| 940 | else |
| 941 | { |
| 942 | /* ??? Do we need to do any sign-extension here? */ |
| 943 | memcpy (buf + 4 - len, valbuf, len); |
| 944 | } |
| 945 | regcache_cooked_write (regcache, SPARC_O0_REGNUM, buf); |
| 946 | } |
| 947 | } |
| 948 | |
| 949 | static enum return_value_convention |
| 950 | sparc32_return_value (struct gdbarch *gdbarch, struct type *type, |
| 951 | struct regcache *regcache, void *readbuf, |
| 952 | const void *writebuf) |
| 953 | { |
| 954 | if (sparc_structure_or_union_p (type) |
| 955 | || (sparc_floating_p (type) && TYPE_LENGTH (type) == 16)) |
| 956 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 957 | |
| 958 | if (readbuf) |
| 959 | sparc32_extract_return_value (type, regcache, readbuf); |
| 960 | if (writebuf) |
| 961 | sparc32_store_return_value (type, regcache, writebuf); |
| 962 | |
| 963 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 964 | } |
| 965 | |
| 966 | #if 0 |
| 967 | /* NOTE: cagney/2004-01-17: For the moment disable this method. The |
| 968 | architecture and CORE-gdb will need new code (and a replacement for |
| 969 | DEPRECATED_EXTRACT_STRUCT_VALUE_ADDRESS) before this can be made to |
| 970 | work robustly. Here is a possible function signature: */ |
| 971 | /* NOTE: cagney/2004-01-17: So far only the 32-bit SPARC ABI has been |
| 972 | identifed as having a way to robustly recover the address of a |
| 973 | struct-convention return-value (after the function has returned). |
| 974 | For all other ABIs so far examined, the calling convention makes no |
| 975 | guarenteed that the register containing the return-value will be |
| 976 | preserved and hence that the return-value's address can be |
| 977 | recovered. */ |
| 978 | /* Extract from REGCACHE, which contains the (raw) register state, the |
| 979 | address in which a function should return its structure value, as a |
| 980 | CORE_ADDR. */ |
| 981 | |
| 982 | static CORE_ADDR |
| 983 | sparc32_extract_struct_value_address (struct regcache *regcache) |
| 984 | { |
| 985 | ULONGEST sp; |
| 986 | |
| 987 | regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp); |
| 988 | return read_memory_unsigned_integer (sp + 64, 4); |
| 989 | } |
| 990 | #endif |
| 991 | |
| 992 | static int |
| 993 | sparc32_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type) |
| 994 | { |
| 995 | return (sparc_structure_or_union_p (type) |
| 996 | || (sparc_floating_p (type) && TYPE_LENGTH (type) == 16)); |
| 997 | } |
| 998 | |
| 999 | \f |
| 1000 | /* The SPARC Architecture doesn't have hardware single-step support, |
| 1001 | and most operating systems don't implement it either, so we provide |
| 1002 | software single-step mechanism. */ |
| 1003 | |
| 1004 | static CORE_ADDR |
| 1005 | sparc_analyze_control_transfer (CORE_ADDR pc, CORE_ADDR *npc) |
| 1006 | { |
| 1007 | unsigned long insn = sparc_fetch_instruction (pc); |
| 1008 | int conditional_p = X_COND (insn) & 0x7; |
| 1009 | int branch_p = 0; |
| 1010 | long offset = 0; /* Must be signed for sign-extend. */ |
| 1011 | |
| 1012 | if (X_OP (insn) == 0 && X_OP2 (insn) == 3 && (insn & 0x1000000) == 0) |
| 1013 | { |
| 1014 | /* Branch on Integer Register with Prediction (BPr). */ |
| 1015 | branch_p = 1; |
| 1016 | conditional_p = 1; |
| 1017 | } |
| 1018 | else if (X_OP (insn) == 0 && X_OP2 (insn) == 6) |
| 1019 | { |
| 1020 | /* Branch on Floating-Point Condition Codes (FBfcc). */ |
| 1021 | branch_p = 1; |
| 1022 | offset = 4 * X_DISP22 (insn); |
| 1023 | } |
| 1024 | else if (X_OP (insn) == 0 && X_OP2 (insn) == 5) |
| 1025 | { |
| 1026 | /* Branch on Floating-Point Condition Codes with Prediction |
| 1027 | (FBPfcc). */ |
| 1028 | branch_p = 1; |
| 1029 | offset = 4 * X_DISP19 (insn); |
| 1030 | } |
| 1031 | else if (X_OP (insn) == 0 && X_OP2 (insn) == 2) |
| 1032 | { |
| 1033 | /* Branch on Integer Condition Codes (Bicc). */ |
| 1034 | branch_p = 1; |
| 1035 | offset = 4 * X_DISP22 (insn); |
| 1036 | } |
| 1037 | else if (X_OP (insn) == 0 && X_OP2 (insn) == 1) |
| 1038 | { |
| 1039 | /* Branch on Integer Condition Codes with Prediction (BPcc). */ |
| 1040 | branch_p = 1; |
| 1041 | offset = 4 * X_DISP19 (insn); |
| 1042 | } |
| 1043 | |
| 1044 | /* FIXME: Handle DONE and RETRY instructions. */ |
| 1045 | |
| 1046 | /* FIXME: Handle the Trap instruction. */ |
| 1047 | |
| 1048 | if (branch_p) |
| 1049 | { |
| 1050 | if (conditional_p) |
| 1051 | { |
| 1052 | /* For conditional branches, return nPC + 4 iff the annul |
| 1053 | bit is 1. */ |
| 1054 | return (X_A (insn) ? *npc + 4 : 0); |
| 1055 | } |
| 1056 | else |
| 1057 | { |
| 1058 | /* For unconditional branches, return the target if its |
| 1059 | specified condition is "always" and return nPC + 4 if the |
| 1060 | condition is "never". If the annul bit is 1, set *NPC to |
| 1061 | zero. */ |
| 1062 | if (X_COND (insn) == 0x0) |
| 1063 | pc = *npc, offset = 4; |
| 1064 | if (X_A (insn)) |
| 1065 | *npc = 0; |
| 1066 | |
| 1067 | gdb_assert (offset != 0); |
| 1068 | return pc + offset; |
| 1069 | } |
| 1070 | } |
| 1071 | |
| 1072 | return 0; |
| 1073 | } |
| 1074 | |
| 1075 | void |
| 1076 | sparc_software_single_step (enum target_signal sig, int insert_breakpoints_p) |
| 1077 | { |
| 1078 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 1079 | static CORE_ADDR npc, nnpc; |
| 1080 | static char npc_save[4], nnpc_save[4]; |
| 1081 | |
| 1082 | if (insert_breakpoints_p) |
| 1083 | { |
| 1084 | CORE_ADDR pc, orig_npc; |
| 1085 | |
| 1086 | pc = sparc_address_from_register (tdep->pc_regnum); |
| 1087 | orig_npc = npc = sparc_address_from_register (tdep->npc_regnum); |
| 1088 | |
| 1089 | /* Analyze the instruction at PC. */ |
| 1090 | nnpc = sparc_analyze_control_transfer (pc, &npc); |
| 1091 | if (npc != 0) |
| 1092 | target_insert_breakpoint (npc, npc_save); |
| 1093 | if (nnpc != 0) |
| 1094 | target_insert_breakpoint (nnpc, nnpc_save); |
| 1095 | |
| 1096 | /* Assert that we have set at least one breakpoint, and that |
| 1097 | they're not set at the same spot - unless we're going |
| 1098 | from here straight to NULL, i.e. a call or jump to 0. */ |
| 1099 | gdb_assert (npc != 0 || nnpc != 0 || orig_npc == 0); |
| 1100 | gdb_assert (nnpc != npc || orig_npc == 0); |
| 1101 | } |
| 1102 | else |
| 1103 | { |
| 1104 | if (npc != 0) |
| 1105 | target_remove_breakpoint (npc, npc_save); |
| 1106 | if (nnpc != 0) |
| 1107 | target_remove_breakpoint (nnpc, nnpc_save); |
| 1108 | } |
| 1109 | } |
| 1110 | |
| 1111 | static void |
| 1112 | sparc_write_pc (CORE_ADDR pc, ptid_t ptid) |
| 1113 | { |
| 1114 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 1115 | |
| 1116 | write_register_pid (tdep->pc_regnum, pc, ptid); |
| 1117 | write_register_pid (tdep->npc_regnum, pc + 4, ptid); |
| 1118 | } |
| 1119 | \f |
| 1120 | /* Unglobalize NAME. */ |
| 1121 | |
| 1122 | char * |
| 1123 | sparc_stabs_unglobalize_name (char *name) |
| 1124 | { |
| 1125 | /* The Sun compilers (Sun ONE Studio, Forte Developer, Sun WorkShop, |
| 1126 | SunPRO) convert file static variables into global values, a |
| 1127 | process known as globalization. In order to do this, the |
| 1128 | compiler will create a unique prefix and prepend it to each file |
| 1129 | static variable. For static variables within a function, this |
| 1130 | globalization prefix is followed by the function name (nested |
| 1131 | static variables within a function are supposed to generate a |
| 1132 | warning message, and are left alone). The procedure is |
| 1133 | documented in the Stabs Interface Manual, which is distrubuted |
| 1134 | with the compilers, although version 4.0 of the manual seems to |
| 1135 | be incorrect in some places, at least for SPARC. The |
| 1136 | globalization prefix is encoded into an N_OPT stab, with the form |
| 1137 | "G=<prefix>". The globalization prefix always seems to start |
| 1138 | with a dollar sign '$'; a dot '.' is used as a seperator. So we |
| 1139 | simply strip everything up until the last dot. */ |
| 1140 | |
| 1141 | if (name[0] == '$') |
| 1142 | { |
| 1143 | char *p = strrchr (name, '.'); |
| 1144 | if (p) |
| 1145 | return p + 1; |
| 1146 | } |
| 1147 | |
| 1148 | return name; |
| 1149 | } |
| 1150 | \f |
| 1151 | |
| 1152 | /* Return the appropriate register set for the core section identified |
| 1153 | by SECT_NAME and SECT_SIZE. */ |
| 1154 | |
| 1155 | const struct regset * |
| 1156 | sparc_regset_from_core_section (struct gdbarch *gdbarch, |
| 1157 | const char *sect_name, size_t sect_size) |
| 1158 | { |
| 1159 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1160 | |
| 1161 | if (strcmp (sect_name, ".reg") == 0 && sect_size >= tdep->sizeof_gregset) |
| 1162 | return tdep->gregset; |
| 1163 | |
| 1164 | if (strcmp (sect_name, ".reg2") == 0 && sect_size >= tdep->sizeof_fpregset) |
| 1165 | return tdep->fpregset; |
| 1166 | |
| 1167 | return NULL; |
| 1168 | } |
| 1169 | \f |
| 1170 | |
| 1171 | static struct gdbarch * |
| 1172 | sparc32_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 1173 | { |
| 1174 | struct gdbarch_tdep *tdep; |
| 1175 | struct gdbarch *gdbarch; |
| 1176 | |
| 1177 | /* If there is already a candidate, use it. */ |
| 1178 | arches = gdbarch_list_lookup_by_info (arches, &info); |
| 1179 | if (arches != NULL) |
| 1180 | return arches->gdbarch; |
| 1181 | |
| 1182 | /* Allocate space for the new architecture. */ |
| 1183 | tdep = XMALLOC (struct gdbarch_tdep); |
| 1184 | gdbarch = gdbarch_alloc (&info, tdep); |
| 1185 | |
| 1186 | tdep->pc_regnum = SPARC32_PC_REGNUM; |
| 1187 | tdep->npc_regnum = SPARC32_NPC_REGNUM; |
| 1188 | tdep->gregset = NULL; |
| 1189 | tdep->sizeof_gregset = 0; |
| 1190 | tdep->fpregset = NULL; |
| 1191 | tdep->sizeof_fpregset = 0; |
| 1192 | tdep->plt_entry_size = 0; |
| 1193 | |
| 1194 | set_gdbarch_long_double_bit (gdbarch, 128); |
| 1195 | set_gdbarch_long_double_format (gdbarch, &floatformat_sparc_quad); |
| 1196 | |
| 1197 | set_gdbarch_num_regs (gdbarch, SPARC32_NUM_REGS); |
| 1198 | set_gdbarch_register_name (gdbarch, sparc32_register_name); |
| 1199 | set_gdbarch_register_type (gdbarch, sparc32_register_type); |
| 1200 | set_gdbarch_num_pseudo_regs (gdbarch, SPARC32_NUM_PSEUDO_REGS); |
| 1201 | set_gdbarch_pseudo_register_read (gdbarch, sparc32_pseudo_register_read); |
| 1202 | set_gdbarch_pseudo_register_write (gdbarch, sparc32_pseudo_register_write); |
| 1203 | |
| 1204 | /* Register numbers of various important registers. */ |
| 1205 | set_gdbarch_sp_regnum (gdbarch, SPARC_SP_REGNUM); /* %sp */ |
| 1206 | set_gdbarch_pc_regnum (gdbarch, SPARC32_PC_REGNUM); /* %pc */ |
| 1207 | set_gdbarch_fp0_regnum (gdbarch, SPARC_F0_REGNUM); /* %f0 */ |
| 1208 | |
| 1209 | /* Call dummy code. */ |
| 1210 | set_gdbarch_call_dummy_location (gdbarch, ON_STACK); |
| 1211 | set_gdbarch_push_dummy_code (gdbarch, sparc32_push_dummy_code); |
| 1212 | set_gdbarch_push_dummy_call (gdbarch, sparc32_push_dummy_call); |
| 1213 | |
| 1214 | set_gdbarch_return_value (gdbarch, sparc32_return_value); |
| 1215 | set_gdbarch_stabs_argument_has_addr |
| 1216 | (gdbarch, sparc32_stabs_argument_has_addr); |
| 1217 | |
| 1218 | set_gdbarch_skip_prologue (gdbarch, sparc32_skip_prologue); |
| 1219 | |
| 1220 | /* Stack grows downward. */ |
| 1221 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 1222 | |
| 1223 | set_gdbarch_breakpoint_from_pc (gdbarch, sparc_breakpoint_from_pc); |
| 1224 | |
| 1225 | set_gdbarch_frame_args_skip (gdbarch, 8); |
| 1226 | |
| 1227 | set_gdbarch_print_insn (gdbarch, print_insn_sparc); |
| 1228 | |
| 1229 | set_gdbarch_software_single_step (gdbarch, sparc_software_single_step); |
| 1230 | set_gdbarch_write_pc (gdbarch, sparc_write_pc); |
| 1231 | |
| 1232 | set_gdbarch_unwind_dummy_id (gdbarch, sparc_unwind_dummy_id); |
| 1233 | |
| 1234 | set_gdbarch_unwind_pc (gdbarch, sparc_unwind_pc); |
| 1235 | |
| 1236 | frame_base_set_default (gdbarch, &sparc32_frame_base); |
| 1237 | |
| 1238 | /* Hook in ABI-specific overrides, if they have been registered. */ |
| 1239 | gdbarch_init_osabi (info, gdbarch); |
| 1240 | |
| 1241 | frame_unwind_append_sniffer (gdbarch, sparc32_frame_sniffer); |
| 1242 | |
| 1243 | /* If we have register sets, enable the generic core file support. */ |
| 1244 | if (tdep->gregset) |
| 1245 | set_gdbarch_regset_from_core_section (gdbarch, |
| 1246 | sparc_regset_from_core_section); |
| 1247 | |
| 1248 | return gdbarch; |
| 1249 | } |
| 1250 | \f |
| 1251 | /* Helper functions for dealing with register windows. */ |
| 1252 | |
| 1253 | void |
| 1254 | sparc_supply_rwindow (struct regcache *regcache, CORE_ADDR sp, int regnum) |
| 1255 | { |
| 1256 | int offset = 0; |
| 1257 | char buf[8]; |
| 1258 | int i; |
| 1259 | |
| 1260 | if (sp & 1) |
| 1261 | { |
| 1262 | /* Registers are 64-bit. */ |
| 1263 | sp += BIAS; |
| 1264 | |
| 1265 | for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++) |
| 1266 | { |
| 1267 | if (regnum == i || regnum == -1) |
| 1268 | { |
| 1269 | target_read_memory (sp + ((i - SPARC_L0_REGNUM) * 8), buf, 8); |
| 1270 | regcache_raw_supply (regcache, i, buf); |
| 1271 | } |
| 1272 | } |
| 1273 | } |
| 1274 | else |
| 1275 | { |
| 1276 | /* Registers are 32-bit. Toss any sign-extension of the stack |
| 1277 | pointer. */ |
| 1278 | sp &= 0xffffffffUL; |
| 1279 | |
| 1280 | /* Clear out the top half of the temporary buffer, and put the |
| 1281 | register value in the bottom half if we're in 64-bit mode. */ |
| 1282 | if (gdbarch_ptr_bit (current_gdbarch) == 64) |
| 1283 | { |
| 1284 | memset (buf, 0, 4); |
| 1285 | offset = 4; |
| 1286 | } |
| 1287 | |
| 1288 | for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++) |
| 1289 | { |
| 1290 | if (regnum == i || regnum == -1) |
| 1291 | { |
| 1292 | target_read_memory (sp + ((i - SPARC_L0_REGNUM) * 4), |
| 1293 | buf + offset, 4); |
| 1294 | |
| 1295 | /* Handle StackGhost. */ |
| 1296 | if (i == SPARC_I7_REGNUM) |
| 1297 | { |
| 1298 | ULONGEST wcookie = sparc_fetch_wcookie (); |
| 1299 | ULONGEST i7 = extract_unsigned_integer (buf + offset, 4); |
| 1300 | |
| 1301 | store_unsigned_integer (buf + offset, 4, i7 ^ wcookie); |
| 1302 | } |
| 1303 | |
| 1304 | regcache_raw_supply (regcache, i, buf); |
| 1305 | } |
| 1306 | } |
| 1307 | } |
| 1308 | } |
| 1309 | |
| 1310 | void |
| 1311 | sparc_collect_rwindow (const struct regcache *regcache, |
| 1312 | CORE_ADDR sp, int regnum) |
| 1313 | { |
| 1314 | int offset = 0; |
| 1315 | char buf[8]; |
| 1316 | int i; |
| 1317 | |
| 1318 | if (sp & 1) |
| 1319 | { |
| 1320 | /* Registers are 64-bit. */ |
| 1321 | sp += BIAS; |
| 1322 | |
| 1323 | for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++) |
| 1324 | { |
| 1325 | if (regnum == -1 || regnum == SPARC_SP_REGNUM || regnum == i) |
| 1326 | { |
| 1327 | regcache_raw_collect (regcache, i, buf); |
| 1328 | target_write_memory (sp + ((i - SPARC_L0_REGNUM) * 8), buf, 8); |
| 1329 | } |
| 1330 | } |
| 1331 | } |
| 1332 | else |
| 1333 | { |
| 1334 | /* Registers are 32-bit. Toss any sign-extension of the stack |
| 1335 | pointer. */ |
| 1336 | sp &= 0xffffffffUL; |
| 1337 | |
| 1338 | /* Only use the bottom half if we're in 64-bit mode. */ |
| 1339 | if (gdbarch_ptr_bit (current_gdbarch) == 64) |
| 1340 | offset = 4; |
| 1341 | |
| 1342 | for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++) |
| 1343 | { |
| 1344 | if (regnum == -1 || regnum == SPARC_SP_REGNUM || regnum == i) |
| 1345 | { |
| 1346 | regcache_raw_collect (regcache, i, buf); |
| 1347 | |
| 1348 | /* Handle StackGhost. */ |
| 1349 | if (i == SPARC_I7_REGNUM) |
| 1350 | { |
| 1351 | ULONGEST wcookie = sparc_fetch_wcookie (); |
| 1352 | ULONGEST i7 = extract_unsigned_integer (buf + offset, 4); |
| 1353 | |
| 1354 | store_unsigned_integer (buf + offset, 4, i7 ^ wcookie); |
| 1355 | } |
| 1356 | |
| 1357 | target_write_memory (sp + ((i - SPARC_L0_REGNUM) * 4), |
| 1358 | buf + offset, 4); |
| 1359 | } |
| 1360 | } |
| 1361 | } |
| 1362 | } |
| 1363 | |
| 1364 | /* Helper functions for dealing with register sets. */ |
| 1365 | |
| 1366 | void |
| 1367 | sparc32_supply_gregset (const struct sparc_gregset *gregset, |
| 1368 | struct regcache *regcache, |
| 1369 | int regnum, const void *gregs) |
| 1370 | { |
| 1371 | const char *regs = gregs; |
| 1372 | int i; |
| 1373 | |
| 1374 | if (regnum == SPARC32_PSR_REGNUM || regnum == -1) |
| 1375 | regcache_raw_supply (regcache, SPARC32_PSR_REGNUM, |
| 1376 | regs + gregset->r_psr_offset); |
| 1377 | |
| 1378 | if (regnum == SPARC32_PC_REGNUM || regnum == -1) |
| 1379 | regcache_raw_supply (regcache, SPARC32_PC_REGNUM, |
| 1380 | regs + gregset->r_pc_offset); |
| 1381 | |
| 1382 | if (regnum == SPARC32_NPC_REGNUM || regnum == -1) |
| 1383 | regcache_raw_supply (regcache, SPARC32_NPC_REGNUM, |
| 1384 | regs + gregset->r_npc_offset); |
| 1385 | |
| 1386 | if (regnum == SPARC32_Y_REGNUM || regnum == -1) |
| 1387 | regcache_raw_supply (regcache, SPARC32_Y_REGNUM, |
| 1388 | regs + gregset->r_y_offset); |
| 1389 | |
| 1390 | if (regnum == SPARC_G0_REGNUM || regnum == -1) |
| 1391 | regcache_raw_supply (regcache, SPARC_G0_REGNUM, NULL); |
| 1392 | |
| 1393 | if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_O7_REGNUM) || regnum == -1) |
| 1394 | { |
| 1395 | int offset = gregset->r_g1_offset; |
| 1396 | |
| 1397 | for (i = SPARC_G1_REGNUM; i <= SPARC_O7_REGNUM; i++) |
| 1398 | { |
| 1399 | if (regnum == i || regnum == -1) |
| 1400 | regcache_raw_supply (regcache, i, regs + offset); |
| 1401 | offset += 4; |
| 1402 | } |
| 1403 | } |
| 1404 | |
| 1405 | if ((regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM) || regnum == -1) |
| 1406 | { |
| 1407 | /* Not all of the register set variants include Locals and |
| 1408 | Inputs. For those that don't, we read them off the stack. */ |
| 1409 | if (gregset->r_l0_offset == -1) |
| 1410 | { |
| 1411 | ULONGEST sp; |
| 1412 | |
| 1413 | regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp); |
| 1414 | sparc_supply_rwindow (regcache, sp, regnum); |
| 1415 | } |
| 1416 | else |
| 1417 | { |
| 1418 | int offset = gregset->r_l0_offset; |
| 1419 | |
| 1420 | for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++) |
| 1421 | { |
| 1422 | if (regnum == i || regnum == -1) |
| 1423 | regcache_raw_supply (regcache, i, regs + offset); |
| 1424 | offset += 4; |
| 1425 | } |
| 1426 | } |
| 1427 | } |
| 1428 | } |
| 1429 | |
| 1430 | void |
| 1431 | sparc32_collect_gregset (const struct sparc_gregset *gregset, |
| 1432 | const struct regcache *regcache, |
| 1433 | int regnum, void *gregs) |
| 1434 | { |
| 1435 | char *regs = gregs; |
| 1436 | int i; |
| 1437 | |
| 1438 | if (regnum == SPARC32_PSR_REGNUM || regnum == -1) |
| 1439 | regcache_raw_collect (regcache, SPARC32_PSR_REGNUM, |
| 1440 | regs + gregset->r_psr_offset); |
| 1441 | |
| 1442 | if (regnum == SPARC32_PC_REGNUM || regnum == -1) |
| 1443 | regcache_raw_collect (regcache, SPARC32_PC_REGNUM, |
| 1444 | regs + gregset->r_pc_offset); |
| 1445 | |
| 1446 | if (regnum == SPARC32_NPC_REGNUM || regnum == -1) |
| 1447 | regcache_raw_collect (regcache, SPARC32_NPC_REGNUM, |
| 1448 | regs + gregset->r_npc_offset); |
| 1449 | |
| 1450 | if (regnum == SPARC32_Y_REGNUM || regnum == -1) |
| 1451 | regcache_raw_collect (regcache, SPARC32_Y_REGNUM, |
| 1452 | regs + gregset->r_y_offset); |
| 1453 | |
| 1454 | if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_O7_REGNUM) || regnum == -1) |
| 1455 | { |
| 1456 | int offset = gregset->r_g1_offset; |
| 1457 | |
| 1458 | /* %g0 is always zero. */ |
| 1459 | for (i = SPARC_G1_REGNUM; i <= SPARC_O7_REGNUM; i++) |
| 1460 | { |
| 1461 | if (regnum == i || regnum == -1) |
| 1462 | regcache_raw_collect (regcache, i, regs + offset); |
| 1463 | offset += 4; |
| 1464 | } |
| 1465 | } |
| 1466 | |
| 1467 | if ((regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM) || regnum == -1) |
| 1468 | { |
| 1469 | /* Not all of the register set variants include Locals and |
| 1470 | Inputs. For those that don't, we read them off the stack. */ |
| 1471 | if (gregset->r_l0_offset != -1) |
| 1472 | { |
| 1473 | int offset = gregset->r_l0_offset; |
| 1474 | |
| 1475 | for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++) |
| 1476 | { |
| 1477 | if (regnum == i || regnum == -1) |
| 1478 | regcache_raw_collect (regcache, i, regs + offset); |
| 1479 | offset += 4; |
| 1480 | } |
| 1481 | } |
| 1482 | } |
| 1483 | } |
| 1484 | |
| 1485 | void |
| 1486 | sparc32_supply_fpregset (struct regcache *regcache, |
| 1487 | int regnum, const void *fpregs) |
| 1488 | { |
| 1489 | const char *regs = fpregs; |
| 1490 | int i; |
| 1491 | |
| 1492 | for (i = 0; i < 32; i++) |
| 1493 | { |
| 1494 | if (regnum == (SPARC_F0_REGNUM + i) || regnum == -1) |
| 1495 | regcache_raw_supply (regcache, SPARC_F0_REGNUM + i, regs + (i * 4)); |
| 1496 | } |
| 1497 | |
| 1498 | if (regnum == SPARC32_FSR_REGNUM || regnum == -1) |
| 1499 | regcache_raw_supply (regcache, SPARC32_FSR_REGNUM, regs + (32 * 4) + 4); |
| 1500 | } |
| 1501 | |
| 1502 | void |
| 1503 | sparc32_collect_fpregset (const struct regcache *regcache, |
| 1504 | int regnum, void *fpregs) |
| 1505 | { |
| 1506 | char *regs = fpregs; |
| 1507 | int i; |
| 1508 | |
| 1509 | for (i = 0; i < 32; i++) |
| 1510 | { |
| 1511 | if (regnum == (SPARC_F0_REGNUM + i) || regnum == -1) |
| 1512 | regcache_raw_collect (regcache, SPARC_F0_REGNUM + i, regs + (i * 4)); |
| 1513 | } |
| 1514 | |
| 1515 | if (regnum == SPARC32_FSR_REGNUM || regnum == -1) |
| 1516 | regcache_raw_collect (regcache, SPARC32_FSR_REGNUM, regs + (32 * 4) + 4); |
| 1517 | } |
| 1518 | \f |
| 1519 | |
| 1520 | /* SunOS 4. */ |
| 1521 | |
| 1522 | /* From <machine/reg.h>. */ |
| 1523 | const struct sparc_gregset sparc32_sunos4_gregset = |
| 1524 | { |
| 1525 | 0 * 4, /* %psr */ |
| 1526 | 1 * 4, /* %pc */ |
| 1527 | 2 * 4, /* %npc */ |
| 1528 | 3 * 4, /* %y */ |
| 1529 | -1, /* %wim */ |
| 1530 | -1, /* %tbr */ |
| 1531 | 4 * 4, /* %g1 */ |
| 1532 | -1 /* %l0 */ |
| 1533 | }; |
| 1534 | \f |
| 1535 | |
| 1536 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 1537 | void _initialize_sparc_tdep (void); |
| 1538 | |
| 1539 | void |
| 1540 | _initialize_sparc_tdep (void) |
| 1541 | { |
| 1542 | register_gdbarch_init (bfd_arch_sparc, sparc32_gdbarch_init); |
| 1543 | } |