| 1 | /* Target-dependent code for SPARC. |
| 2 | |
| 3 | Copyright (C) 2003-2018 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "arch-utils.h" |
| 22 | #include "dis-asm.h" |
| 23 | #include "dwarf2.h" |
| 24 | #include "dwarf2-frame.h" |
| 25 | #include "frame.h" |
| 26 | #include "frame-base.h" |
| 27 | #include "frame-unwind.h" |
| 28 | #include "gdbcore.h" |
| 29 | #include "gdbtypes.h" |
| 30 | #include "inferior.h" |
| 31 | #include "symtab.h" |
| 32 | #include "objfiles.h" |
| 33 | #include "osabi.h" |
| 34 | #include "regcache.h" |
| 35 | #include "target.h" |
| 36 | #include "target-descriptions.h" |
| 37 | #include "value.h" |
| 38 | |
| 39 | #include "sparc-tdep.h" |
| 40 | #include "sparc-ravenscar-thread.h" |
| 41 | #include <algorithm> |
| 42 | |
| 43 | struct regset; |
| 44 | |
| 45 | /* This file implements the SPARC 32-bit ABI as defined by the section |
| 46 | "Low-Level System Information" of the SPARC Compliance Definition |
| 47 | (SCD) 2.4.1, which is the 32-bit System V psABI for SPARC. The SCD |
| 48 | lists changes with respect to the original 32-bit psABI as defined |
| 49 | in the "System V ABI, SPARC Processor Supplement". |
| 50 | |
| 51 | Note that if we talk about SunOS, we mean SunOS 4.x, which was |
| 52 | BSD-based, which is sometimes (retroactively?) referred to as |
| 53 | Solaris 1.x. If we talk about Solaris we mean Solaris 2.x and |
| 54 | above (Solaris 7, 8 and 9 are nothing but Solaris 2.7, 2.8 and 2.9 |
| 55 | suffering from severe version number inflation). Solaris 2.x is |
| 56 | also known as SunOS 5.x, since that's what uname(1) says. Solaris |
| 57 | 2.x is SVR4-based. */ |
| 58 | |
| 59 | /* Please use the sparc32_-prefix for 32-bit specific code, the |
| 60 | sparc64_-prefix for 64-bit specific code and the sparc_-prefix for |
| 61 | code that can handle both. The 64-bit specific code lives in |
| 62 | sparc64-tdep.c; don't add any here. */ |
| 63 | |
| 64 | /* The SPARC Floating-Point Quad-Precision format is similar to |
| 65 | big-endian IA-64 Quad-Precision format. */ |
| 66 | #define floatformats_sparc_quad floatformats_ia64_quad |
| 67 | |
| 68 | /* The stack pointer is offset from the stack frame by a BIAS of 2047 |
| 69 | (0x7ff) for 64-bit code. BIAS is likely to be defined on SPARC |
| 70 | hosts, so undefine it first. */ |
| 71 | #undef BIAS |
| 72 | #define BIAS 2047 |
| 73 | |
| 74 | /* Macros to extract fields from SPARC instructions. */ |
| 75 | #define X_OP(i) (((i) >> 30) & 0x3) |
| 76 | #define X_RD(i) (((i) >> 25) & 0x1f) |
| 77 | #define X_A(i) (((i) >> 29) & 1) |
| 78 | #define X_COND(i) (((i) >> 25) & 0xf) |
| 79 | #define X_OP2(i) (((i) >> 22) & 0x7) |
| 80 | #define X_IMM22(i) ((i) & 0x3fffff) |
| 81 | #define X_OP3(i) (((i) >> 19) & 0x3f) |
| 82 | #define X_RS1(i) (((i) >> 14) & 0x1f) |
| 83 | #define X_RS2(i) ((i) & 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_DISP10(i) ((((((i) >> 11) && 0x300) | (((i) >> 5) & 0xff)) ^ 0x200) - 0x200) |
| 89 | #define X_SIMM13(i) ((((i) & 0x1fff) ^ 0x1000) - 0x1000) |
| 90 | /* Macros to identify some instructions. */ |
| 91 | /* RETURN (RETT in V8) */ |
| 92 | #define X_RETTURN(i) ((X_OP (i) == 0x2) && (X_OP3 (i) == 0x39)) |
| 93 | |
| 94 | /* Fetch the instruction at PC. Instructions are always big-endian |
| 95 | even if the processor operates in little-endian mode. */ |
| 96 | |
| 97 | unsigned long |
| 98 | sparc_fetch_instruction (CORE_ADDR pc) |
| 99 | { |
| 100 | gdb_byte buf[4]; |
| 101 | unsigned long insn; |
| 102 | int i; |
| 103 | |
| 104 | /* If we can't read the instruction at PC, return zero. */ |
| 105 | if (target_read_memory (pc, buf, sizeof (buf))) |
| 106 | return 0; |
| 107 | |
| 108 | insn = 0; |
| 109 | for (i = 0; i < sizeof (buf); i++) |
| 110 | insn = (insn << 8) | buf[i]; |
| 111 | return insn; |
| 112 | } |
| 113 | \f |
| 114 | |
| 115 | /* Return non-zero if the instruction corresponding to PC is an "unimp" |
| 116 | instruction. */ |
| 117 | |
| 118 | static int |
| 119 | sparc_is_unimp_insn (CORE_ADDR pc) |
| 120 | { |
| 121 | const unsigned long insn = sparc_fetch_instruction (pc); |
| 122 | |
| 123 | return ((insn & 0xc1c00000) == 0); |
| 124 | } |
| 125 | |
| 126 | /* Return non-zero if the instruction corresponding to PC is an |
| 127 | "annulled" branch, i.e. the annul bit is set. */ |
| 128 | |
| 129 | int |
| 130 | sparc_is_annulled_branch_insn (CORE_ADDR pc) |
| 131 | { |
| 132 | /* The branch instructions featuring an annul bit can be identified |
| 133 | by the following bit patterns: |
| 134 | |
| 135 | OP=0 |
| 136 | OP2=1: Branch on Integer Condition Codes with Prediction (BPcc). |
| 137 | OP2=2: Branch on Integer Condition Codes (Bcc). |
| 138 | OP2=5: Branch on FP Condition Codes with Prediction (FBfcc). |
| 139 | OP2=6: Branch on FP Condition Codes (FBcc). |
| 140 | OP2=3 && Bit28=0: |
| 141 | Branch on Integer Register with Prediction (BPr). |
| 142 | |
| 143 | This leaves out ILLTRAP (OP2=0), SETHI/NOP (OP2=4) and the V8 |
| 144 | coprocessor branch instructions (Op2=7). */ |
| 145 | |
| 146 | const unsigned long insn = sparc_fetch_instruction (pc); |
| 147 | const unsigned op2 = X_OP2 (insn); |
| 148 | |
| 149 | if ((X_OP (insn) == 0) |
| 150 | && ((op2 == 1) || (op2 == 2) || (op2 == 5) || (op2 == 6) |
| 151 | || ((op2 == 3) && ((insn & 0x10000000) == 0)))) |
| 152 | return X_A (insn); |
| 153 | else |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | /* OpenBSD/sparc includes StackGhost, which according to the author's |
| 158 | website http://stackghost.cerias.purdue.edu "... transparently and |
| 159 | automatically protects applications' stack frames; more |
| 160 | specifically, it guards the return pointers. The protection |
| 161 | mechanisms require no application source or binary modification and |
| 162 | imposes only a negligible performance penalty." |
| 163 | |
| 164 | The same website provides the following description of how |
| 165 | StackGhost works: |
| 166 | |
| 167 | "StackGhost interfaces with the kernel trap handler that would |
| 168 | normally write out registers to the stack and the handler that |
| 169 | would read them back in. By XORing a cookie into the |
| 170 | return-address saved in the user stack when it is actually written |
| 171 | to the stack, and then XOR it out when the return-address is pulled |
| 172 | from the stack, StackGhost can cause attacker corrupted return |
| 173 | pointers to behave in a manner the attacker cannot predict. |
| 174 | StackGhost can also use several unused bits in the return pointer |
| 175 | to detect a smashed return pointer and abort the process." |
| 176 | |
| 177 | For GDB this means that whenever we're reading %i7 from a stack |
| 178 | frame's window save area, we'll have to XOR the cookie. |
| 179 | |
| 180 | More information on StackGuard can be found on in: |
| 181 | |
| 182 | Mike Frantzen and Mike Shuey. "StackGhost: Hardware Facilitated |
| 183 | Stack Protection." 2001. Published in USENIX Security Symposium |
| 184 | '01. */ |
| 185 | |
| 186 | /* Fetch StackGhost Per-Process XOR cookie. */ |
| 187 | |
| 188 | ULONGEST |
| 189 | sparc_fetch_wcookie (struct gdbarch *gdbarch) |
| 190 | { |
| 191 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 192 | struct target_ops *ops = ¤t_target; |
| 193 | gdb_byte buf[8]; |
| 194 | int len; |
| 195 | |
| 196 | len = target_read (ops, TARGET_OBJECT_WCOOKIE, NULL, buf, 0, 8); |
| 197 | if (len == -1) |
| 198 | return 0; |
| 199 | |
| 200 | /* We should have either an 32-bit or an 64-bit cookie. */ |
| 201 | gdb_assert (len == 4 || len == 8); |
| 202 | |
| 203 | return extract_unsigned_integer (buf, len, byte_order); |
| 204 | } |
| 205 | \f |
| 206 | |
| 207 | /* The functions on this page are intended to be used to classify |
| 208 | function arguments. */ |
| 209 | |
| 210 | /* Check whether TYPE is "Integral or Pointer". */ |
| 211 | |
| 212 | static int |
| 213 | sparc_integral_or_pointer_p (const struct type *type) |
| 214 | { |
| 215 | int len = TYPE_LENGTH (type); |
| 216 | |
| 217 | switch (TYPE_CODE (type)) |
| 218 | { |
| 219 | case TYPE_CODE_INT: |
| 220 | case TYPE_CODE_BOOL: |
| 221 | case TYPE_CODE_CHAR: |
| 222 | case TYPE_CODE_ENUM: |
| 223 | case TYPE_CODE_RANGE: |
| 224 | /* We have byte, half-word, word and extended-word/doubleword |
| 225 | integral types. The doubleword is an extension to the |
| 226 | original 32-bit ABI by the SCD 2.4.x. */ |
| 227 | return (len == 1 || len == 2 || len == 4 || len == 8); |
| 228 | case TYPE_CODE_PTR: |
| 229 | case TYPE_CODE_REF: |
| 230 | case TYPE_CODE_RVALUE_REF: |
| 231 | /* Allow either 32-bit or 64-bit pointers. */ |
| 232 | return (len == 4 || len == 8); |
| 233 | default: |
| 234 | break; |
| 235 | } |
| 236 | |
| 237 | return 0; |
| 238 | } |
| 239 | |
| 240 | /* Check whether TYPE is "Floating". */ |
| 241 | |
| 242 | static int |
| 243 | sparc_floating_p (const struct type *type) |
| 244 | { |
| 245 | switch (TYPE_CODE (type)) |
| 246 | { |
| 247 | case TYPE_CODE_FLT: |
| 248 | { |
| 249 | int len = TYPE_LENGTH (type); |
| 250 | return (len == 4 || len == 8 || len == 16); |
| 251 | } |
| 252 | default: |
| 253 | break; |
| 254 | } |
| 255 | |
| 256 | return 0; |
| 257 | } |
| 258 | |
| 259 | /* Check whether TYPE is "Complex Floating". */ |
| 260 | |
| 261 | static int |
| 262 | sparc_complex_floating_p (const struct type *type) |
| 263 | { |
| 264 | switch (TYPE_CODE (type)) |
| 265 | { |
| 266 | case TYPE_CODE_COMPLEX: |
| 267 | { |
| 268 | int len = TYPE_LENGTH (type); |
| 269 | return (len == 8 || len == 16 || len == 32); |
| 270 | } |
| 271 | default: |
| 272 | break; |
| 273 | } |
| 274 | |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | /* Check whether TYPE is "Structure or Union". |
| 279 | |
| 280 | In terms of Ada subprogram calls, arrays are treated the same as |
| 281 | struct and union types. So this function also returns non-zero |
| 282 | for array types. */ |
| 283 | |
| 284 | static int |
| 285 | sparc_structure_or_union_p (const struct type *type) |
| 286 | { |
| 287 | switch (TYPE_CODE (type)) |
| 288 | { |
| 289 | case TYPE_CODE_STRUCT: |
| 290 | case TYPE_CODE_UNION: |
| 291 | case TYPE_CODE_ARRAY: |
| 292 | return 1; |
| 293 | default: |
| 294 | break; |
| 295 | } |
| 296 | |
| 297 | return 0; |
| 298 | } |
| 299 | |
| 300 | /* Check whether TYPE is returned on registers. */ |
| 301 | |
| 302 | static bool |
| 303 | sparc_structure_return_p (const struct type *type) |
| 304 | { |
| 305 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_LENGTH (type) <= 8) |
| 306 | { |
| 307 | struct type *t = check_typedef (TYPE_TARGET_TYPE (type)); |
| 308 | |
| 309 | if (sparc_floating_p (t) && TYPE_LENGTH (t) == 8) |
| 310 | return true; |
| 311 | return false; |
| 312 | } |
| 313 | if (sparc_floating_p (type) && TYPE_LENGTH (type) == 16) |
| 314 | return true; |
| 315 | return sparc_structure_or_union_p (type); |
| 316 | } |
| 317 | |
| 318 | /* Check whether TYPE is passed on registers. */ |
| 319 | |
| 320 | static bool |
| 321 | sparc_arg_on_registers_p (const struct type *type) |
| 322 | { |
| 323 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_LENGTH (type) <= 8) |
| 324 | { |
| 325 | struct type *t = check_typedef (TYPE_TARGET_TYPE (type)); |
| 326 | |
| 327 | if (sparc_floating_p (t) && TYPE_LENGTH (t) == 8) |
| 328 | return false; |
| 329 | return true; |
| 330 | } |
| 331 | if (sparc_structure_or_union_p (type) || sparc_complex_floating_p (type) |
| 332 | || (sparc_floating_p (type) && TYPE_LENGTH (type) == 16)) |
| 333 | return false; |
| 334 | return true; |
| 335 | } |
| 336 | |
| 337 | /* Register information. */ |
| 338 | #define SPARC32_FPU_REGISTERS \ |
| 339 | "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \ |
| 340 | "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \ |
| 341 | "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \ |
| 342 | "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31" |
| 343 | #define SPARC32_CP0_REGISTERS \ |
| 344 | "y", "psr", "wim", "tbr", "pc", "npc", "fsr", "csr" |
| 345 | |
| 346 | static const char *sparc_core_register_names[] = { SPARC_CORE_REGISTERS }; |
| 347 | static const char *sparc32_fpu_register_names[] = { SPARC32_FPU_REGISTERS }; |
| 348 | static const char *sparc32_cp0_register_names[] = { SPARC32_CP0_REGISTERS }; |
| 349 | |
| 350 | static const char *sparc32_register_names[] = |
| 351 | { |
| 352 | SPARC_CORE_REGISTERS, |
| 353 | SPARC32_FPU_REGISTERS, |
| 354 | SPARC32_CP0_REGISTERS |
| 355 | }; |
| 356 | |
| 357 | /* Total number of registers. */ |
| 358 | #define SPARC32_NUM_REGS ARRAY_SIZE (sparc32_register_names) |
| 359 | |
| 360 | /* We provide the aliases %d0..%d30 for the floating registers as |
| 361 | "psuedo" registers. */ |
| 362 | |
| 363 | static const char *sparc32_pseudo_register_names[] = |
| 364 | { |
| 365 | "d0", "d2", "d4", "d6", "d8", "d10", "d12", "d14", |
| 366 | "d16", "d18", "d20", "d22", "d24", "d26", "d28", "d30" |
| 367 | }; |
| 368 | |
| 369 | /* Total number of pseudo registers. */ |
| 370 | #define SPARC32_NUM_PSEUDO_REGS ARRAY_SIZE (sparc32_pseudo_register_names) |
| 371 | |
| 372 | /* Return the name of pseudo register REGNUM. */ |
| 373 | |
| 374 | static const char * |
| 375 | sparc32_pseudo_register_name (struct gdbarch *gdbarch, int regnum) |
| 376 | { |
| 377 | regnum -= gdbarch_num_regs (gdbarch); |
| 378 | |
| 379 | if (regnum < SPARC32_NUM_PSEUDO_REGS) |
| 380 | return sparc32_pseudo_register_names[regnum]; |
| 381 | |
| 382 | internal_error (__FILE__, __LINE__, |
| 383 | _("sparc32_pseudo_register_name: bad register number %d"), |
| 384 | regnum); |
| 385 | } |
| 386 | |
| 387 | /* Return the name of register REGNUM. */ |
| 388 | |
| 389 | static const char * |
| 390 | sparc32_register_name (struct gdbarch *gdbarch, int regnum) |
| 391 | { |
| 392 | if (tdesc_has_registers (gdbarch_target_desc (gdbarch))) |
| 393 | return tdesc_register_name (gdbarch, regnum); |
| 394 | |
| 395 | if (regnum >= 0 && regnum < gdbarch_num_regs (gdbarch)) |
| 396 | return sparc32_register_names[regnum]; |
| 397 | |
| 398 | return sparc32_pseudo_register_name (gdbarch, regnum); |
| 399 | } |
| 400 | \f |
| 401 | /* Construct types for ISA-specific registers. */ |
| 402 | |
| 403 | static struct type * |
| 404 | sparc_psr_type (struct gdbarch *gdbarch) |
| 405 | { |
| 406 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 407 | |
| 408 | if (!tdep->sparc_psr_type) |
| 409 | { |
| 410 | struct type *type; |
| 411 | |
| 412 | type = arch_flags_type (gdbarch, "builtin_type_sparc_psr", 32); |
| 413 | append_flags_type_flag (type, 5, "ET"); |
| 414 | append_flags_type_flag (type, 6, "PS"); |
| 415 | append_flags_type_flag (type, 7, "S"); |
| 416 | append_flags_type_flag (type, 12, "EF"); |
| 417 | append_flags_type_flag (type, 13, "EC"); |
| 418 | |
| 419 | tdep->sparc_psr_type = type; |
| 420 | } |
| 421 | |
| 422 | return tdep->sparc_psr_type; |
| 423 | } |
| 424 | |
| 425 | static struct type * |
| 426 | sparc_fsr_type (struct gdbarch *gdbarch) |
| 427 | { |
| 428 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 429 | |
| 430 | if (!tdep->sparc_fsr_type) |
| 431 | { |
| 432 | struct type *type; |
| 433 | |
| 434 | type = arch_flags_type (gdbarch, "builtin_type_sparc_fsr", 32); |
| 435 | append_flags_type_flag (type, 0, "NXA"); |
| 436 | append_flags_type_flag (type, 1, "DZA"); |
| 437 | append_flags_type_flag (type, 2, "UFA"); |
| 438 | append_flags_type_flag (type, 3, "OFA"); |
| 439 | append_flags_type_flag (type, 4, "NVA"); |
| 440 | append_flags_type_flag (type, 5, "NXC"); |
| 441 | append_flags_type_flag (type, 6, "DZC"); |
| 442 | append_flags_type_flag (type, 7, "UFC"); |
| 443 | append_flags_type_flag (type, 8, "OFC"); |
| 444 | append_flags_type_flag (type, 9, "NVC"); |
| 445 | append_flags_type_flag (type, 22, "NS"); |
| 446 | append_flags_type_flag (type, 23, "NXM"); |
| 447 | append_flags_type_flag (type, 24, "DZM"); |
| 448 | append_flags_type_flag (type, 25, "UFM"); |
| 449 | append_flags_type_flag (type, 26, "OFM"); |
| 450 | append_flags_type_flag (type, 27, "NVM"); |
| 451 | |
| 452 | tdep->sparc_fsr_type = type; |
| 453 | } |
| 454 | |
| 455 | return tdep->sparc_fsr_type; |
| 456 | } |
| 457 | |
| 458 | /* Return the GDB type object for the "standard" data type of data in |
| 459 | pseudo register REGNUM. */ |
| 460 | |
| 461 | static struct type * |
| 462 | sparc32_pseudo_register_type (struct gdbarch *gdbarch, int regnum) |
| 463 | { |
| 464 | regnum -= gdbarch_num_regs (gdbarch); |
| 465 | |
| 466 | if (regnum >= SPARC32_D0_REGNUM && regnum <= SPARC32_D30_REGNUM) |
| 467 | return builtin_type (gdbarch)->builtin_double; |
| 468 | |
| 469 | internal_error (__FILE__, __LINE__, |
| 470 | _("sparc32_pseudo_register_type: bad register number %d"), |
| 471 | regnum); |
| 472 | } |
| 473 | |
| 474 | /* Return the GDB type object for the "standard" data type of data in |
| 475 | register REGNUM. */ |
| 476 | |
| 477 | static struct type * |
| 478 | sparc32_register_type (struct gdbarch *gdbarch, int regnum) |
| 479 | { |
| 480 | if (tdesc_has_registers (gdbarch_target_desc (gdbarch))) |
| 481 | return tdesc_register_type (gdbarch, regnum); |
| 482 | |
| 483 | if (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM) |
| 484 | return builtin_type (gdbarch)->builtin_float; |
| 485 | |
| 486 | if (regnum == SPARC_SP_REGNUM || regnum == SPARC_FP_REGNUM) |
| 487 | return builtin_type (gdbarch)->builtin_data_ptr; |
| 488 | |
| 489 | if (regnum == SPARC32_PC_REGNUM || regnum == SPARC32_NPC_REGNUM) |
| 490 | return builtin_type (gdbarch)->builtin_func_ptr; |
| 491 | |
| 492 | if (regnum == SPARC32_PSR_REGNUM) |
| 493 | return sparc_psr_type (gdbarch); |
| 494 | |
| 495 | if (regnum == SPARC32_FSR_REGNUM) |
| 496 | return sparc_fsr_type (gdbarch); |
| 497 | |
| 498 | if (regnum >= gdbarch_num_regs (gdbarch)) |
| 499 | return sparc32_pseudo_register_type (gdbarch, regnum); |
| 500 | |
| 501 | return builtin_type (gdbarch)->builtin_int32; |
| 502 | } |
| 503 | |
| 504 | static enum register_status |
| 505 | sparc32_pseudo_register_read (struct gdbarch *gdbarch, |
| 506 | readable_regcache *regcache, |
| 507 | int regnum, gdb_byte *buf) |
| 508 | { |
| 509 | enum register_status status; |
| 510 | |
| 511 | regnum -= gdbarch_num_regs (gdbarch); |
| 512 | gdb_assert (regnum >= SPARC32_D0_REGNUM && regnum <= SPARC32_D30_REGNUM); |
| 513 | |
| 514 | regnum = SPARC_F0_REGNUM + 2 * (regnum - SPARC32_D0_REGNUM); |
| 515 | status = regcache->raw_read (regnum, buf); |
| 516 | if (status == REG_VALID) |
| 517 | status = regcache->raw_read (regnum + 1, buf + 4); |
| 518 | return status; |
| 519 | } |
| 520 | |
| 521 | static void |
| 522 | sparc32_pseudo_register_write (struct gdbarch *gdbarch, |
| 523 | struct regcache *regcache, |
| 524 | int regnum, const gdb_byte *buf) |
| 525 | { |
| 526 | regnum -= gdbarch_num_regs (gdbarch); |
| 527 | gdb_assert (regnum >= SPARC32_D0_REGNUM && regnum <= SPARC32_D30_REGNUM); |
| 528 | |
| 529 | regnum = SPARC_F0_REGNUM + 2 * (regnum - SPARC32_D0_REGNUM); |
| 530 | regcache_raw_write (regcache, regnum, buf); |
| 531 | regcache_raw_write (regcache, regnum + 1, buf + 4); |
| 532 | } |
| 533 | \f |
| 534 | /* Implement the stack_frame_destroyed_p gdbarch method. */ |
| 535 | |
| 536 | int |
| 537 | sparc_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 538 | { |
| 539 | /* This function must return true if we are one instruction after an |
| 540 | instruction that destroyed the stack frame of the current |
| 541 | function. The SPARC instructions used to restore the callers |
| 542 | stack frame are RESTORE and RETURN/RETT. |
| 543 | |
| 544 | Of these RETURN/RETT is a branch instruction and thus we return |
| 545 | true if we are in its delay slot. |
| 546 | |
| 547 | RESTORE is almost always found in the delay slot of a branch |
| 548 | instruction that transfers control to the caller, such as JMPL. |
| 549 | Thus the next instruction is in the caller frame and we don't |
| 550 | need to do anything about it. */ |
| 551 | |
| 552 | unsigned int insn = sparc_fetch_instruction (pc - 4); |
| 553 | |
| 554 | return X_RETTURN (insn); |
| 555 | } |
| 556 | \f |
| 557 | |
| 558 | static CORE_ADDR |
| 559 | sparc32_frame_align (struct gdbarch *gdbarch, CORE_ADDR address) |
| 560 | { |
| 561 | /* The ABI requires double-word alignment. */ |
| 562 | return address & ~0x7; |
| 563 | } |
| 564 | |
| 565 | static CORE_ADDR |
| 566 | sparc32_push_dummy_code (struct gdbarch *gdbarch, CORE_ADDR sp, |
| 567 | CORE_ADDR funcaddr, |
| 568 | struct value **args, int nargs, |
| 569 | struct type *value_type, |
| 570 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr, |
| 571 | struct regcache *regcache) |
| 572 | { |
| 573 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 574 | |
| 575 | *bp_addr = sp - 4; |
| 576 | *real_pc = funcaddr; |
| 577 | |
| 578 | if (using_struct_return (gdbarch, NULL, value_type)) |
| 579 | { |
| 580 | gdb_byte buf[4]; |
| 581 | |
| 582 | /* This is an UNIMP instruction. */ |
| 583 | store_unsigned_integer (buf, 4, byte_order, |
| 584 | TYPE_LENGTH (value_type) & 0x1fff); |
| 585 | write_memory (sp - 8, buf, 4); |
| 586 | return sp - 8; |
| 587 | } |
| 588 | |
| 589 | return sp - 4; |
| 590 | } |
| 591 | |
| 592 | static CORE_ADDR |
| 593 | sparc32_store_arguments (struct regcache *regcache, int nargs, |
| 594 | struct value **args, CORE_ADDR sp, |
| 595 | int struct_return, CORE_ADDR struct_addr) |
| 596 | { |
| 597 | struct gdbarch *gdbarch = regcache->arch (); |
| 598 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 599 | /* Number of words in the "parameter array". */ |
| 600 | int num_elements = 0; |
| 601 | int element = 0; |
| 602 | int i; |
| 603 | |
| 604 | for (i = 0; i < nargs; i++) |
| 605 | { |
| 606 | struct type *type = value_type (args[i]); |
| 607 | int len = TYPE_LENGTH (type); |
| 608 | |
| 609 | if (!sparc_arg_on_registers_p (type)) |
| 610 | { |
| 611 | /* Structure, Union and Quad-Precision Arguments. */ |
| 612 | sp -= len; |
| 613 | |
| 614 | /* Use doubleword alignment for these values. That's always |
| 615 | correct, and wasting a few bytes shouldn't be a problem. */ |
| 616 | sp &= ~0x7; |
| 617 | |
| 618 | write_memory (sp, value_contents (args[i]), len); |
| 619 | args[i] = value_from_pointer (lookup_pointer_type (type), sp); |
| 620 | num_elements++; |
| 621 | } |
| 622 | else if (sparc_floating_p (type)) |
| 623 | { |
| 624 | /* Floating arguments. */ |
| 625 | gdb_assert (len == 4 || len == 8); |
| 626 | num_elements += (len / 4); |
| 627 | } |
| 628 | else |
| 629 | { |
| 630 | /* Integral and pointer arguments. */ |
| 631 | gdb_assert (sparc_integral_or_pointer_p (type) |
| 632 | || (TYPE_CODE (type) == TYPE_CODE_ARRAY && len <= 8)); |
| 633 | num_elements += ((len + 3) / 4); |
| 634 | } |
| 635 | } |
| 636 | |
| 637 | /* Always allocate at least six words. */ |
| 638 | sp -= std::max (6, num_elements) * 4; |
| 639 | |
| 640 | /* The psABI says that "Software convention requires space for the |
| 641 | struct/union return value pointer, even if the word is unused." */ |
| 642 | sp -= 4; |
| 643 | |
| 644 | /* The psABI says that "Although software convention and the |
| 645 | operating system require every stack frame to be doubleword |
| 646 | aligned." */ |
| 647 | sp &= ~0x7; |
| 648 | |
| 649 | for (i = 0; i < nargs; i++) |
| 650 | { |
| 651 | const bfd_byte *valbuf = value_contents (args[i]); |
| 652 | struct type *type = value_type (args[i]); |
| 653 | int len = TYPE_LENGTH (type); |
| 654 | gdb_byte buf[4]; |
| 655 | |
| 656 | if (len < 4) |
| 657 | { |
| 658 | memset (buf, 0, 4 - len); |
| 659 | memcpy (buf + 4 - len, valbuf, len); |
| 660 | valbuf = buf; |
| 661 | len = 4; |
| 662 | } |
| 663 | |
| 664 | gdb_assert (len == 4 || len == 8); |
| 665 | |
| 666 | if (element < 6) |
| 667 | { |
| 668 | int regnum = SPARC_O0_REGNUM + element; |
| 669 | |
| 670 | regcache_cooked_write (regcache, regnum, valbuf); |
| 671 | if (len > 4 && element < 5) |
| 672 | regcache_cooked_write (regcache, regnum + 1, valbuf + 4); |
| 673 | } |
| 674 | |
| 675 | /* Always store the argument in memory. */ |
| 676 | write_memory (sp + 4 + element * 4, valbuf, len); |
| 677 | element += len / 4; |
| 678 | } |
| 679 | |
| 680 | gdb_assert (element == num_elements); |
| 681 | |
| 682 | if (struct_return) |
| 683 | { |
| 684 | gdb_byte buf[4]; |
| 685 | |
| 686 | store_unsigned_integer (buf, 4, byte_order, struct_addr); |
| 687 | write_memory (sp, buf, 4); |
| 688 | } |
| 689 | |
| 690 | return sp; |
| 691 | } |
| 692 | |
| 693 | static CORE_ADDR |
| 694 | sparc32_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
| 695 | struct regcache *regcache, CORE_ADDR bp_addr, |
| 696 | int nargs, struct value **args, CORE_ADDR sp, |
| 697 | int struct_return, CORE_ADDR struct_addr) |
| 698 | { |
| 699 | CORE_ADDR call_pc = (struct_return ? (bp_addr - 12) : (bp_addr - 8)); |
| 700 | |
| 701 | /* Set return address. */ |
| 702 | regcache_cooked_write_unsigned (regcache, SPARC_O7_REGNUM, call_pc); |
| 703 | |
| 704 | /* Set up function arguments. */ |
| 705 | sp = sparc32_store_arguments (regcache, nargs, args, sp, |
| 706 | struct_return, struct_addr); |
| 707 | |
| 708 | /* Allocate the 16-word window save area. */ |
| 709 | sp -= 16 * 4; |
| 710 | |
| 711 | /* Stack should be doubleword aligned at this point. */ |
| 712 | gdb_assert (sp % 8 == 0); |
| 713 | |
| 714 | /* Finally, update the stack pointer. */ |
| 715 | regcache_cooked_write_unsigned (regcache, SPARC_SP_REGNUM, sp); |
| 716 | |
| 717 | return sp; |
| 718 | } |
| 719 | \f |
| 720 | |
| 721 | /* Use the program counter to determine the contents and size of a |
| 722 | breakpoint instruction. Return a pointer to a string of bytes that |
| 723 | encode a breakpoint instruction, store the length of the string in |
| 724 | *LEN and optionally adjust *PC to point to the correct memory |
| 725 | location for inserting the breakpoint. */ |
| 726 | constexpr gdb_byte sparc_break_insn[] = { 0x91, 0xd0, 0x20, 0x01 }; |
| 727 | |
| 728 | typedef BP_MANIPULATION (sparc_break_insn) sparc_breakpoint; |
| 729 | \f |
| 730 | |
| 731 | /* Allocate and initialize a frame cache. */ |
| 732 | |
| 733 | static struct sparc_frame_cache * |
| 734 | sparc_alloc_frame_cache (void) |
| 735 | { |
| 736 | struct sparc_frame_cache *cache; |
| 737 | |
| 738 | cache = FRAME_OBSTACK_ZALLOC (struct sparc_frame_cache); |
| 739 | |
| 740 | /* Base address. */ |
| 741 | cache->base = 0; |
| 742 | cache->pc = 0; |
| 743 | |
| 744 | /* Frameless until proven otherwise. */ |
| 745 | cache->frameless_p = 1; |
| 746 | cache->frame_offset = 0; |
| 747 | cache->saved_regs_mask = 0; |
| 748 | cache->copied_regs_mask = 0; |
| 749 | cache->struct_return_p = 0; |
| 750 | |
| 751 | return cache; |
| 752 | } |
| 753 | |
| 754 | /* GCC generates several well-known sequences of instructions at the begining |
| 755 | of each function prologue when compiling with -fstack-check. If one of |
| 756 | such sequences starts at START_PC, then return the address of the |
| 757 | instruction immediately past this sequence. Otherwise, return START_PC. */ |
| 758 | |
| 759 | static CORE_ADDR |
| 760 | sparc_skip_stack_check (const CORE_ADDR start_pc) |
| 761 | { |
| 762 | CORE_ADDR pc = start_pc; |
| 763 | unsigned long insn; |
| 764 | int probing_loop = 0; |
| 765 | |
| 766 | /* With GCC, all stack checking sequences begin with the same two |
| 767 | instructions, plus an optional one in the case of a probing loop: |
| 768 | |
| 769 | sethi <some immediate>, %g1 |
| 770 | sub %sp, %g1, %g1 |
| 771 | |
| 772 | or: |
| 773 | |
| 774 | sethi <some immediate>, %g1 |
| 775 | sethi <some immediate>, %g4 |
| 776 | sub %sp, %g1, %g1 |
| 777 | |
| 778 | or: |
| 779 | |
| 780 | sethi <some immediate>, %g1 |
| 781 | sub %sp, %g1, %g1 |
| 782 | sethi <some immediate>, %g4 |
| 783 | |
| 784 | If the optional instruction is found (setting g4), assume that a |
| 785 | probing loop will follow. */ |
| 786 | |
| 787 | /* sethi <some immediate>, %g1 */ |
| 788 | insn = sparc_fetch_instruction (pc); |
| 789 | pc = pc + 4; |
| 790 | if (!(X_OP (insn) == 0 && X_OP2 (insn) == 0x4 && X_RD (insn) == 1)) |
| 791 | return start_pc; |
| 792 | |
| 793 | /* optional: sethi <some immediate>, %g4 */ |
| 794 | insn = sparc_fetch_instruction (pc); |
| 795 | pc = pc + 4; |
| 796 | if (X_OP (insn) == 0 && X_OP2 (insn) == 0x4 && X_RD (insn) == 4) |
| 797 | { |
| 798 | probing_loop = 1; |
| 799 | insn = sparc_fetch_instruction (pc); |
| 800 | pc = pc + 4; |
| 801 | } |
| 802 | |
| 803 | /* sub %sp, %g1, %g1 */ |
| 804 | if (!(X_OP (insn) == 2 && X_OP3 (insn) == 0x4 && !X_I(insn) |
| 805 | && X_RD (insn) == 1 && X_RS1 (insn) == 14 && X_RS2 (insn) == 1)) |
| 806 | return start_pc; |
| 807 | |
| 808 | insn = sparc_fetch_instruction (pc); |
| 809 | pc = pc + 4; |
| 810 | |
| 811 | /* optional: sethi <some immediate>, %g4 */ |
| 812 | if (X_OP (insn) == 0 && X_OP2 (insn) == 0x4 && X_RD (insn) == 4) |
| 813 | { |
| 814 | probing_loop = 1; |
| 815 | insn = sparc_fetch_instruction (pc); |
| 816 | pc = pc + 4; |
| 817 | } |
| 818 | |
| 819 | /* First possible sequence: |
| 820 | [first two instructions above] |
| 821 | clr [%g1 - some immediate] */ |
| 822 | |
| 823 | /* clr [%g1 - some immediate] */ |
| 824 | if (X_OP (insn) == 3 && X_OP3(insn) == 0x4 && X_I(insn) |
| 825 | && X_RS1 (insn) == 1 && X_RD (insn) == 0) |
| 826 | { |
| 827 | /* Valid stack-check sequence, return the new PC. */ |
| 828 | return pc; |
| 829 | } |
| 830 | |
| 831 | /* Second possible sequence: A small number of probes. |
| 832 | [first two instructions above] |
| 833 | clr [%g1] |
| 834 | add %g1, -<some immediate>, %g1 |
| 835 | clr [%g1] |
| 836 | [repeat the two instructions above any (small) number of times] |
| 837 | clr [%g1 - some immediate] */ |
| 838 | |
| 839 | /* clr [%g1] */ |
| 840 | else if (X_OP (insn) == 3 && X_OP3(insn) == 0x4 && !X_I(insn) |
| 841 | && X_RS1 (insn) == 1 && X_RD (insn) == 0) |
| 842 | { |
| 843 | while (1) |
| 844 | { |
| 845 | /* add %g1, -<some immediate>, %g1 */ |
| 846 | insn = sparc_fetch_instruction (pc); |
| 847 | pc = pc + 4; |
| 848 | if (!(X_OP (insn) == 2 && X_OP3(insn) == 0 && X_I(insn) |
| 849 | && X_RS1 (insn) == 1 && X_RD (insn) == 1)) |
| 850 | break; |
| 851 | |
| 852 | /* clr [%g1] */ |
| 853 | insn = sparc_fetch_instruction (pc); |
| 854 | pc = pc + 4; |
| 855 | if (!(X_OP (insn) == 3 && X_OP3(insn) == 0x4 && !X_I(insn) |
| 856 | && X_RD (insn) == 0 && X_RS1 (insn) == 1)) |
| 857 | return start_pc; |
| 858 | } |
| 859 | |
| 860 | /* clr [%g1 - some immediate] */ |
| 861 | if (!(X_OP (insn) == 3 && X_OP3(insn) == 0x4 && X_I(insn) |
| 862 | && X_RS1 (insn) == 1 && X_RD (insn) == 0)) |
| 863 | return start_pc; |
| 864 | |
| 865 | /* We found a valid stack-check sequence, return the new PC. */ |
| 866 | return pc; |
| 867 | } |
| 868 | |
| 869 | /* Third sequence: A probing loop. |
| 870 | [first three instructions above] |
| 871 | sub %g1, %g4, %g4 |
| 872 | cmp %g1, %g4 |
| 873 | be <disp> |
| 874 | add %g1, -<some immediate>, %g1 |
| 875 | ba <disp> |
| 876 | clr [%g1] |
| 877 | |
| 878 | And an optional last probe for the remainder: |
| 879 | |
| 880 | clr [%g4 - some immediate] */ |
| 881 | |
| 882 | if (probing_loop) |
| 883 | { |
| 884 | /* sub %g1, %g4, %g4 */ |
| 885 | if (!(X_OP (insn) == 2 && X_OP3 (insn) == 0x4 && !X_I(insn) |
| 886 | && X_RD (insn) == 4 && X_RS1 (insn) == 1 && X_RS2 (insn) == 4)) |
| 887 | return start_pc; |
| 888 | |
| 889 | /* cmp %g1, %g4 */ |
| 890 | insn = sparc_fetch_instruction (pc); |
| 891 | pc = pc + 4; |
| 892 | if (!(X_OP (insn) == 2 && X_OP3 (insn) == 0x14 && !X_I(insn) |
| 893 | && X_RD (insn) == 0 && X_RS1 (insn) == 1 && X_RS2 (insn) == 4)) |
| 894 | return start_pc; |
| 895 | |
| 896 | /* be <disp> */ |
| 897 | insn = sparc_fetch_instruction (pc); |
| 898 | pc = pc + 4; |
| 899 | if (!(X_OP (insn) == 0 && X_COND (insn) == 0x1)) |
| 900 | return start_pc; |
| 901 | |
| 902 | /* add %g1, -<some immediate>, %g1 */ |
| 903 | insn = sparc_fetch_instruction (pc); |
| 904 | pc = pc + 4; |
| 905 | if (!(X_OP (insn) == 2 && X_OP3(insn) == 0 && X_I(insn) |
| 906 | && X_RS1 (insn) == 1 && X_RD (insn) == 1)) |
| 907 | return start_pc; |
| 908 | |
| 909 | /* ba <disp> */ |
| 910 | insn = sparc_fetch_instruction (pc); |
| 911 | pc = pc + 4; |
| 912 | if (!(X_OP (insn) == 0 && X_COND (insn) == 0x8)) |
| 913 | return start_pc; |
| 914 | |
| 915 | /* clr [%g1] (st %g0, [%g1] or st %g0, [%g1+0]) */ |
| 916 | insn = sparc_fetch_instruction (pc); |
| 917 | pc = pc + 4; |
| 918 | if (!(X_OP (insn) == 3 && X_OP3(insn) == 0x4 |
| 919 | && X_RD (insn) == 0 && X_RS1 (insn) == 1 |
| 920 | && (!X_I(insn) || X_SIMM13 (insn) == 0))) |
| 921 | return start_pc; |
| 922 | |
| 923 | /* We found a valid stack-check sequence, return the new PC. */ |
| 924 | |
| 925 | /* optional: clr [%g4 - some immediate] */ |
| 926 | insn = sparc_fetch_instruction (pc); |
| 927 | pc = pc + 4; |
| 928 | if (!(X_OP (insn) == 3 && X_OP3(insn) == 0x4 && X_I(insn) |
| 929 | && X_RS1 (insn) == 4 && X_RD (insn) == 0)) |
| 930 | return pc - 4; |
| 931 | else |
| 932 | return pc; |
| 933 | } |
| 934 | |
| 935 | /* No stack check code in our prologue, return the start_pc. */ |
| 936 | return start_pc; |
| 937 | } |
| 938 | |
| 939 | /* Record the effect of a SAVE instruction on CACHE. */ |
| 940 | |
| 941 | void |
| 942 | sparc_record_save_insn (struct sparc_frame_cache *cache) |
| 943 | { |
| 944 | /* The frame is set up. */ |
| 945 | cache->frameless_p = 0; |
| 946 | |
| 947 | /* The frame pointer contains the CFA. */ |
| 948 | cache->frame_offset = 0; |
| 949 | |
| 950 | /* The `local' and `in' registers are all saved. */ |
| 951 | cache->saved_regs_mask = 0xffff; |
| 952 | |
| 953 | /* The `out' registers are all renamed. */ |
| 954 | cache->copied_regs_mask = 0xff; |
| 955 | } |
| 956 | |
| 957 | /* Do a full analysis of the prologue at PC and update CACHE accordingly. |
| 958 | Bail out early if CURRENT_PC is reached. Return the address where |
| 959 | the analysis stopped. |
| 960 | |
| 961 | We handle both the traditional register window model and the single |
| 962 | register window (aka flat) model. */ |
| 963 | |
| 964 | CORE_ADDR |
| 965 | sparc_analyze_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, |
| 966 | CORE_ADDR current_pc, struct sparc_frame_cache *cache) |
| 967 | { |
| 968 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 969 | unsigned long insn; |
| 970 | int offset = 0; |
| 971 | int dest = -1; |
| 972 | |
| 973 | pc = sparc_skip_stack_check (pc); |
| 974 | |
| 975 | if (current_pc <= pc) |
| 976 | return current_pc; |
| 977 | |
| 978 | /* We have to handle to "Procedure Linkage Table" (PLT) special. On |
| 979 | SPARC the linker usually defines a symbol (typically |
| 980 | _PROCEDURE_LINKAGE_TABLE_) at the start of the .plt section. |
| 981 | This symbol makes us end up here with PC pointing at the start of |
| 982 | the PLT and CURRENT_PC probably pointing at a PLT entry. If we |
| 983 | would do our normal prologue analysis, we would probably conclude |
| 984 | that we've got a frame when in reality we don't, since the |
| 985 | dynamic linker patches up the first PLT with some code that |
| 986 | starts with a SAVE instruction. Patch up PC such that it points |
| 987 | at the start of our PLT entry. */ |
| 988 | if (tdep->plt_entry_size > 0 && in_plt_section (current_pc)) |
| 989 | pc = current_pc - ((current_pc - pc) % tdep->plt_entry_size); |
| 990 | |
| 991 | insn = sparc_fetch_instruction (pc); |
| 992 | |
| 993 | /* Recognize store insns and record their sources. */ |
| 994 | while (X_OP (insn) == 3 |
| 995 | && (X_OP3 (insn) == 0x4 /* stw */ |
| 996 | || X_OP3 (insn) == 0x7 /* std */ |
| 997 | || X_OP3 (insn) == 0xe) /* stx */ |
| 998 | && X_RS1 (insn) == SPARC_SP_REGNUM) |
| 999 | { |
| 1000 | int regnum = X_RD (insn); |
| 1001 | |
| 1002 | /* Recognize stores into the corresponding stack slots. */ |
| 1003 | if (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM |
| 1004 | && ((X_I (insn) |
| 1005 | && X_SIMM13 (insn) == (X_OP3 (insn) == 0xe |
| 1006 | ? (regnum - SPARC_L0_REGNUM) * 8 + BIAS |
| 1007 | : (regnum - SPARC_L0_REGNUM) * 4)) |
| 1008 | || (!X_I (insn) && regnum == SPARC_L0_REGNUM))) |
| 1009 | { |
| 1010 | cache->saved_regs_mask |= (1 << (regnum - SPARC_L0_REGNUM)); |
| 1011 | if (X_OP3 (insn) == 0x7) |
| 1012 | cache->saved_regs_mask |= (1 << (regnum + 1 - SPARC_L0_REGNUM)); |
| 1013 | } |
| 1014 | |
| 1015 | offset += 4; |
| 1016 | |
| 1017 | insn = sparc_fetch_instruction (pc + offset); |
| 1018 | } |
| 1019 | |
| 1020 | /* Recognize a SETHI insn and record its destination. */ |
| 1021 | if (X_OP (insn) == 0 && X_OP2 (insn) == 0x04) |
| 1022 | { |
| 1023 | dest = X_RD (insn); |
| 1024 | offset += 4; |
| 1025 | |
| 1026 | insn = sparc_fetch_instruction (pc + offset); |
| 1027 | } |
| 1028 | |
| 1029 | /* Allow for an arithmetic operation on DEST or %g1. */ |
| 1030 | if (X_OP (insn) == 2 && X_I (insn) |
| 1031 | && (X_RD (insn) == 1 || X_RD (insn) == dest)) |
| 1032 | { |
| 1033 | offset += 4; |
| 1034 | |
| 1035 | insn = sparc_fetch_instruction (pc + offset); |
| 1036 | } |
| 1037 | |
| 1038 | /* Check for the SAVE instruction that sets up the frame. */ |
| 1039 | if (X_OP (insn) == 2 && X_OP3 (insn) == 0x3c) |
| 1040 | { |
| 1041 | sparc_record_save_insn (cache); |
| 1042 | offset += 4; |
| 1043 | return pc + offset; |
| 1044 | } |
| 1045 | |
| 1046 | /* Check for an arithmetic operation on %sp. */ |
| 1047 | if (X_OP (insn) == 2 |
| 1048 | && (X_OP3 (insn) == 0 || X_OP3 (insn) == 0x4) |
| 1049 | && X_RS1 (insn) == SPARC_SP_REGNUM |
| 1050 | && X_RD (insn) == SPARC_SP_REGNUM) |
| 1051 | { |
| 1052 | if (X_I (insn)) |
| 1053 | { |
| 1054 | cache->frame_offset = X_SIMM13 (insn); |
| 1055 | if (X_OP3 (insn) == 0) |
| 1056 | cache->frame_offset = -cache->frame_offset; |
| 1057 | } |
| 1058 | offset += 4; |
| 1059 | |
| 1060 | insn = sparc_fetch_instruction (pc + offset); |
| 1061 | |
| 1062 | /* Check for an arithmetic operation that sets up the frame. */ |
| 1063 | if (X_OP (insn) == 2 |
| 1064 | && (X_OP3 (insn) == 0 || X_OP3 (insn) == 0x4) |
| 1065 | && X_RS1 (insn) == SPARC_SP_REGNUM |
| 1066 | && X_RD (insn) == SPARC_FP_REGNUM) |
| 1067 | { |
| 1068 | cache->frameless_p = 0; |
| 1069 | cache->frame_offset = 0; |
| 1070 | /* We could check that the amount subtracted to %sp above is the |
| 1071 | same as the one added here, but this seems superfluous. */ |
| 1072 | cache->copied_regs_mask |= 0x40; |
| 1073 | offset += 4; |
| 1074 | |
| 1075 | insn = sparc_fetch_instruction (pc + offset); |
| 1076 | } |
| 1077 | |
| 1078 | /* Check for a move (or) operation that copies the return register. */ |
| 1079 | if (X_OP (insn) == 2 |
| 1080 | && X_OP3 (insn) == 0x2 |
| 1081 | && !X_I (insn) |
| 1082 | && X_RS1 (insn) == SPARC_G0_REGNUM |
| 1083 | && X_RS2 (insn) == SPARC_O7_REGNUM |
| 1084 | && X_RD (insn) == SPARC_I7_REGNUM) |
| 1085 | { |
| 1086 | cache->copied_regs_mask |= 0x80; |
| 1087 | offset += 4; |
| 1088 | } |
| 1089 | |
| 1090 | return pc + offset; |
| 1091 | } |
| 1092 | |
| 1093 | return pc; |
| 1094 | } |
| 1095 | |
| 1096 | static CORE_ADDR |
| 1097 | sparc_unwind_pc (struct gdbarch *gdbarch, struct frame_info *this_frame) |
| 1098 | { |
| 1099 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1100 | return frame_unwind_register_unsigned (this_frame, tdep->pc_regnum); |
| 1101 | } |
| 1102 | |
| 1103 | /* Return PC of first real instruction of the function starting at |
| 1104 | START_PC. */ |
| 1105 | |
| 1106 | static CORE_ADDR |
| 1107 | sparc32_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc) |
| 1108 | { |
| 1109 | struct symtab_and_line sal; |
| 1110 | CORE_ADDR func_start, func_end; |
| 1111 | struct sparc_frame_cache cache; |
| 1112 | |
| 1113 | /* This is the preferred method, find the end of the prologue by |
| 1114 | using the debugging information. */ |
| 1115 | if (find_pc_partial_function (start_pc, NULL, &func_start, &func_end)) |
| 1116 | { |
| 1117 | sal = find_pc_line (func_start, 0); |
| 1118 | |
| 1119 | if (sal.end < func_end |
| 1120 | && start_pc <= sal.end) |
| 1121 | return sal.end; |
| 1122 | } |
| 1123 | |
| 1124 | start_pc = sparc_analyze_prologue (gdbarch, start_pc, 0xffffffffUL, &cache); |
| 1125 | |
| 1126 | /* The psABI says that "Although the first 6 words of arguments |
| 1127 | reside in registers, the standard stack frame reserves space for |
| 1128 | them.". It also suggests that a function may use that space to |
| 1129 | "write incoming arguments 0 to 5" into that space, and that's |
| 1130 | indeed what GCC seems to be doing. In that case GCC will |
| 1131 | generate debug information that points to the stack slots instead |
| 1132 | of the registers, so we should consider the instructions that |
| 1133 | write out these incoming arguments onto the stack. */ |
| 1134 | |
| 1135 | while (1) |
| 1136 | { |
| 1137 | unsigned long insn = sparc_fetch_instruction (start_pc); |
| 1138 | |
| 1139 | /* Recognize instructions that store incoming arguments into the |
| 1140 | corresponding stack slots. */ |
| 1141 | if (X_OP (insn) == 3 && (X_OP3 (insn) & 0x3c) == 0x04 |
| 1142 | && X_I (insn) && X_RS1 (insn) == SPARC_FP_REGNUM) |
| 1143 | { |
| 1144 | int regnum = X_RD (insn); |
| 1145 | |
| 1146 | /* Case of arguments still in %o[0..5]. */ |
| 1147 | if (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O5_REGNUM |
| 1148 | && !(cache.copied_regs_mask & (1 << (regnum - SPARC_O0_REGNUM))) |
| 1149 | && X_SIMM13 (insn) == 68 + (regnum - SPARC_O0_REGNUM) * 4) |
| 1150 | { |
| 1151 | start_pc += 4; |
| 1152 | continue; |
| 1153 | } |
| 1154 | |
| 1155 | /* Case of arguments copied into %i[0..5]. */ |
| 1156 | if (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I5_REGNUM |
| 1157 | && (cache.copied_regs_mask & (1 << (regnum - SPARC_I0_REGNUM))) |
| 1158 | && X_SIMM13 (insn) == 68 + (regnum - SPARC_I0_REGNUM) * 4) |
| 1159 | { |
| 1160 | start_pc += 4; |
| 1161 | continue; |
| 1162 | } |
| 1163 | } |
| 1164 | |
| 1165 | break; |
| 1166 | } |
| 1167 | |
| 1168 | return start_pc; |
| 1169 | } |
| 1170 | |
| 1171 | /* Normal frames. */ |
| 1172 | |
| 1173 | struct sparc_frame_cache * |
| 1174 | sparc_frame_cache (struct frame_info *this_frame, void **this_cache) |
| 1175 | { |
| 1176 | struct sparc_frame_cache *cache; |
| 1177 | |
| 1178 | if (*this_cache) |
| 1179 | return (struct sparc_frame_cache *) *this_cache; |
| 1180 | |
| 1181 | cache = sparc_alloc_frame_cache (); |
| 1182 | *this_cache = cache; |
| 1183 | |
| 1184 | cache->pc = get_frame_func (this_frame); |
| 1185 | if (cache->pc != 0) |
| 1186 | sparc_analyze_prologue (get_frame_arch (this_frame), cache->pc, |
| 1187 | get_frame_pc (this_frame), cache); |
| 1188 | |
| 1189 | if (cache->frameless_p) |
| 1190 | { |
| 1191 | /* This function is frameless, so %fp (%i6) holds the frame |
| 1192 | pointer for our calling frame. Use %sp (%o6) as this frame's |
| 1193 | base address. */ |
| 1194 | cache->base = |
| 1195 | get_frame_register_unsigned (this_frame, SPARC_SP_REGNUM); |
| 1196 | } |
| 1197 | else |
| 1198 | { |
| 1199 | /* For normal frames, %fp (%i6) holds the frame pointer, the |
| 1200 | base address for the current stack frame. */ |
| 1201 | cache->base = |
| 1202 | get_frame_register_unsigned (this_frame, SPARC_FP_REGNUM); |
| 1203 | } |
| 1204 | |
| 1205 | cache->base += cache->frame_offset; |
| 1206 | |
| 1207 | if (cache->base & 1) |
| 1208 | cache->base += BIAS; |
| 1209 | |
| 1210 | return cache; |
| 1211 | } |
| 1212 | |
| 1213 | static int |
| 1214 | sparc32_struct_return_from_sym (struct symbol *sym) |
| 1215 | { |
| 1216 | struct type *type = check_typedef (SYMBOL_TYPE (sym)); |
| 1217 | enum type_code code = TYPE_CODE (type); |
| 1218 | |
| 1219 | if (code == TYPE_CODE_FUNC || code == TYPE_CODE_METHOD) |
| 1220 | { |
| 1221 | type = check_typedef (TYPE_TARGET_TYPE (type)); |
| 1222 | if (sparc_structure_or_union_p (type) |
| 1223 | || (sparc_floating_p (type) && TYPE_LENGTH (type) == 16)) |
| 1224 | return 1; |
| 1225 | } |
| 1226 | |
| 1227 | return 0; |
| 1228 | } |
| 1229 | |
| 1230 | struct sparc_frame_cache * |
| 1231 | sparc32_frame_cache (struct frame_info *this_frame, void **this_cache) |
| 1232 | { |
| 1233 | struct sparc_frame_cache *cache; |
| 1234 | struct symbol *sym; |
| 1235 | |
| 1236 | if (*this_cache) |
| 1237 | return (struct sparc_frame_cache *) *this_cache; |
| 1238 | |
| 1239 | cache = sparc_frame_cache (this_frame, this_cache); |
| 1240 | |
| 1241 | sym = find_pc_function (cache->pc); |
| 1242 | if (sym) |
| 1243 | { |
| 1244 | cache->struct_return_p = sparc32_struct_return_from_sym (sym); |
| 1245 | } |
| 1246 | else |
| 1247 | { |
| 1248 | /* There is no debugging information for this function to |
| 1249 | help us determine whether this function returns a struct |
| 1250 | or not. So we rely on another heuristic which is to check |
| 1251 | the instruction at the return address and see if this is |
| 1252 | an "unimp" instruction. If it is, then it is a struct-return |
| 1253 | function. */ |
| 1254 | CORE_ADDR pc; |
| 1255 | int regnum = |
| 1256 | (cache->copied_regs_mask & 0x80) ? SPARC_I7_REGNUM : SPARC_O7_REGNUM; |
| 1257 | |
| 1258 | pc = get_frame_register_unsigned (this_frame, regnum) + 8; |
| 1259 | if (sparc_is_unimp_insn (pc)) |
| 1260 | cache->struct_return_p = 1; |
| 1261 | } |
| 1262 | |
| 1263 | return cache; |
| 1264 | } |
| 1265 | |
| 1266 | static void |
| 1267 | sparc32_frame_this_id (struct frame_info *this_frame, void **this_cache, |
| 1268 | struct frame_id *this_id) |
| 1269 | { |
| 1270 | struct sparc_frame_cache *cache = |
| 1271 | sparc32_frame_cache (this_frame, this_cache); |
| 1272 | |
| 1273 | /* This marks the outermost frame. */ |
| 1274 | if (cache->base == 0) |
| 1275 | return; |
| 1276 | |
| 1277 | (*this_id) = frame_id_build (cache->base, cache->pc); |
| 1278 | } |
| 1279 | |
| 1280 | static struct value * |
| 1281 | sparc32_frame_prev_register (struct frame_info *this_frame, |
| 1282 | void **this_cache, int regnum) |
| 1283 | { |
| 1284 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 1285 | struct sparc_frame_cache *cache = |
| 1286 | sparc32_frame_cache (this_frame, this_cache); |
| 1287 | |
| 1288 | if (regnum == SPARC32_PC_REGNUM || regnum == SPARC32_NPC_REGNUM) |
| 1289 | { |
| 1290 | CORE_ADDR pc = (regnum == SPARC32_NPC_REGNUM) ? 4 : 0; |
| 1291 | |
| 1292 | /* If this functions has a Structure, Union or Quad-Precision |
| 1293 | return value, we have to skip the UNIMP instruction that encodes |
| 1294 | the size of the structure. */ |
| 1295 | if (cache->struct_return_p) |
| 1296 | pc += 4; |
| 1297 | |
| 1298 | regnum = |
| 1299 | (cache->copied_regs_mask & 0x80) ? SPARC_I7_REGNUM : SPARC_O7_REGNUM; |
| 1300 | pc += get_frame_register_unsigned (this_frame, regnum) + 8; |
| 1301 | return frame_unwind_got_constant (this_frame, regnum, pc); |
| 1302 | } |
| 1303 | |
| 1304 | /* Handle StackGhost. */ |
| 1305 | { |
| 1306 | ULONGEST wcookie = sparc_fetch_wcookie (gdbarch); |
| 1307 | |
| 1308 | if (wcookie != 0 && !cache->frameless_p && regnum == SPARC_I7_REGNUM) |
| 1309 | { |
| 1310 | CORE_ADDR addr = cache->base + (regnum - SPARC_L0_REGNUM) * 4; |
| 1311 | ULONGEST i7; |
| 1312 | |
| 1313 | /* Read the value in from memory. */ |
| 1314 | i7 = get_frame_memory_unsigned (this_frame, addr, 4); |
| 1315 | return frame_unwind_got_constant (this_frame, regnum, i7 ^ wcookie); |
| 1316 | } |
| 1317 | } |
| 1318 | |
| 1319 | /* The previous frame's `local' and `in' registers may have been saved |
| 1320 | in the register save area. */ |
| 1321 | if (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM |
| 1322 | && (cache->saved_regs_mask & (1 << (regnum - SPARC_L0_REGNUM)))) |
| 1323 | { |
| 1324 | CORE_ADDR addr = cache->base + (regnum - SPARC_L0_REGNUM) * 4; |
| 1325 | |
| 1326 | return frame_unwind_got_memory (this_frame, regnum, addr); |
| 1327 | } |
| 1328 | |
| 1329 | /* The previous frame's `out' registers may be accessible as the current |
| 1330 | frame's `in' registers. */ |
| 1331 | if (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM |
| 1332 | && (cache->copied_regs_mask & (1 << (regnum - SPARC_O0_REGNUM)))) |
| 1333 | regnum += (SPARC_I0_REGNUM - SPARC_O0_REGNUM); |
| 1334 | |
| 1335 | return frame_unwind_got_register (this_frame, regnum, regnum); |
| 1336 | } |
| 1337 | |
| 1338 | static const struct frame_unwind sparc32_frame_unwind = |
| 1339 | { |
| 1340 | NORMAL_FRAME, |
| 1341 | default_frame_unwind_stop_reason, |
| 1342 | sparc32_frame_this_id, |
| 1343 | sparc32_frame_prev_register, |
| 1344 | NULL, |
| 1345 | default_frame_sniffer |
| 1346 | }; |
| 1347 | \f |
| 1348 | |
| 1349 | static CORE_ADDR |
| 1350 | sparc32_frame_base_address (struct frame_info *this_frame, void **this_cache) |
| 1351 | { |
| 1352 | struct sparc_frame_cache *cache = |
| 1353 | sparc32_frame_cache (this_frame, this_cache); |
| 1354 | |
| 1355 | return cache->base; |
| 1356 | } |
| 1357 | |
| 1358 | static const struct frame_base sparc32_frame_base = |
| 1359 | { |
| 1360 | &sparc32_frame_unwind, |
| 1361 | sparc32_frame_base_address, |
| 1362 | sparc32_frame_base_address, |
| 1363 | sparc32_frame_base_address |
| 1364 | }; |
| 1365 | |
| 1366 | static struct frame_id |
| 1367 | sparc_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
| 1368 | { |
| 1369 | CORE_ADDR sp; |
| 1370 | |
| 1371 | sp = get_frame_register_unsigned (this_frame, SPARC_SP_REGNUM); |
| 1372 | if (sp & 1) |
| 1373 | sp += BIAS; |
| 1374 | return frame_id_build (sp, get_frame_pc (this_frame)); |
| 1375 | } |
| 1376 | \f |
| 1377 | |
| 1378 | /* Extract a function return value of TYPE from REGCACHE, and copy |
| 1379 | that into VALBUF. */ |
| 1380 | |
| 1381 | static void |
| 1382 | sparc32_extract_return_value (struct type *type, struct regcache *regcache, |
| 1383 | gdb_byte *valbuf) |
| 1384 | { |
| 1385 | int len = TYPE_LENGTH (type); |
| 1386 | gdb_byte buf[32]; |
| 1387 | |
| 1388 | gdb_assert (!sparc_structure_return_p (type)); |
| 1389 | |
| 1390 | if (sparc_floating_p (type) || sparc_complex_floating_p (type) |
| 1391 | || TYPE_CODE (type) == TYPE_CODE_ARRAY) |
| 1392 | { |
| 1393 | /* Floating return values. */ |
| 1394 | regcache_cooked_read (regcache, SPARC_F0_REGNUM, buf); |
| 1395 | if (len > 4) |
| 1396 | regcache_cooked_read (regcache, SPARC_F1_REGNUM, buf + 4); |
| 1397 | if (len > 8) |
| 1398 | { |
| 1399 | regcache_cooked_read (regcache, SPARC_F2_REGNUM, buf + 8); |
| 1400 | regcache_cooked_read (regcache, SPARC_F3_REGNUM, buf + 12); |
| 1401 | } |
| 1402 | if (len > 16) |
| 1403 | { |
| 1404 | regcache_cooked_read (regcache, SPARC_F4_REGNUM, buf + 16); |
| 1405 | regcache_cooked_read (regcache, SPARC_F5_REGNUM, buf + 20); |
| 1406 | regcache_cooked_read (regcache, SPARC_F6_REGNUM, buf + 24); |
| 1407 | regcache_cooked_read (regcache, SPARC_F7_REGNUM, buf + 28); |
| 1408 | } |
| 1409 | memcpy (valbuf, buf, len); |
| 1410 | } |
| 1411 | else |
| 1412 | { |
| 1413 | /* Integral and pointer return values. */ |
| 1414 | gdb_assert (sparc_integral_or_pointer_p (type)); |
| 1415 | |
| 1416 | regcache_cooked_read (regcache, SPARC_O0_REGNUM, buf); |
| 1417 | if (len > 4) |
| 1418 | { |
| 1419 | regcache_cooked_read (regcache, SPARC_O1_REGNUM, buf + 4); |
| 1420 | gdb_assert (len == 8); |
| 1421 | memcpy (valbuf, buf, 8); |
| 1422 | } |
| 1423 | else |
| 1424 | { |
| 1425 | /* Just stripping off any unused bytes should preserve the |
| 1426 | signed-ness just fine. */ |
| 1427 | memcpy (valbuf, buf + 4 - len, len); |
| 1428 | } |
| 1429 | } |
| 1430 | } |
| 1431 | |
| 1432 | /* Store the function return value of type TYPE from VALBUF into |
| 1433 | REGCACHE. */ |
| 1434 | |
| 1435 | static void |
| 1436 | sparc32_store_return_value (struct type *type, struct regcache *regcache, |
| 1437 | const gdb_byte *valbuf) |
| 1438 | { |
| 1439 | int len = TYPE_LENGTH (type); |
| 1440 | gdb_byte buf[32]; |
| 1441 | |
| 1442 | gdb_assert (!sparc_structure_return_p (type)); |
| 1443 | |
| 1444 | if (sparc_floating_p (type) || sparc_complex_floating_p (type)) |
| 1445 | { |
| 1446 | /* Floating return values. */ |
| 1447 | memcpy (buf, valbuf, len); |
| 1448 | regcache_cooked_write (regcache, SPARC_F0_REGNUM, buf); |
| 1449 | if (len > 4) |
| 1450 | regcache_cooked_write (regcache, SPARC_F1_REGNUM, buf + 4); |
| 1451 | if (len > 8) |
| 1452 | { |
| 1453 | regcache_cooked_write (regcache, SPARC_F2_REGNUM, buf + 8); |
| 1454 | regcache_cooked_write (regcache, SPARC_F3_REGNUM, buf + 12); |
| 1455 | } |
| 1456 | if (len > 16) |
| 1457 | { |
| 1458 | regcache_cooked_write (regcache, SPARC_F4_REGNUM, buf + 16); |
| 1459 | regcache_cooked_write (regcache, SPARC_F5_REGNUM, buf + 20); |
| 1460 | regcache_cooked_write (regcache, SPARC_F6_REGNUM, buf + 24); |
| 1461 | regcache_cooked_write (regcache, SPARC_F7_REGNUM, buf + 28); |
| 1462 | } |
| 1463 | } |
| 1464 | else |
| 1465 | { |
| 1466 | /* Integral and pointer return values. */ |
| 1467 | gdb_assert (sparc_integral_or_pointer_p (type)); |
| 1468 | |
| 1469 | if (len > 4) |
| 1470 | { |
| 1471 | gdb_assert (len == 8); |
| 1472 | memcpy (buf, valbuf, 8); |
| 1473 | regcache_cooked_write (regcache, SPARC_O1_REGNUM, buf + 4); |
| 1474 | } |
| 1475 | else |
| 1476 | { |
| 1477 | /* ??? Do we need to do any sign-extension here? */ |
| 1478 | memcpy (buf + 4 - len, valbuf, len); |
| 1479 | } |
| 1480 | regcache_cooked_write (regcache, SPARC_O0_REGNUM, buf); |
| 1481 | } |
| 1482 | } |
| 1483 | |
| 1484 | static enum return_value_convention |
| 1485 | sparc32_return_value (struct gdbarch *gdbarch, struct value *function, |
| 1486 | struct type *type, struct regcache *regcache, |
| 1487 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 1488 | { |
| 1489 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 1490 | |
| 1491 | /* The psABI says that "...every stack frame reserves the word at |
| 1492 | %fp+64. If a function returns a structure, union, or |
| 1493 | quad-precision value, this word should hold the address of the |
| 1494 | object into which the return value should be copied." This |
| 1495 | guarantees that we can always find the return value, not just |
| 1496 | before the function returns. */ |
| 1497 | |
| 1498 | if (sparc_structure_return_p (type)) |
| 1499 | { |
| 1500 | ULONGEST sp; |
| 1501 | CORE_ADDR addr; |
| 1502 | |
| 1503 | if (readbuf) |
| 1504 | { |
| 1505 | regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp); |
| 1506 | addr = read_memory_unsigned_integer (sp + 64, 4, byte_order); |
| 1507 | read_memory (addr, readbuf, TYPE_LENGTH (type)); |
| 1508 | } |
| 1509 | if (writebuf) |
| 1510 | { |
| 1511 | regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp); |
| 1512 | addr = read_memory_unsigned_integer (sp + 64, 4, byte_order); |
| 1513 | write_memory (addr, writebuf, TYPE_LENGTH (type)); |
| 1514 | } |
| 1515 | |
| 1516 | return RETURN_VALUE_ABI_PRESERVES_ADDRESS; |
| 1517 | } |
| 1518 | |
| 1519 | if (readbuf) |
| 1520 | sparc32_extract_return_value (type, regcache, readbuf); |
| 1521 | if (writebuf) |
| 1522 | sparc32_store_return_value (type, regcache, writebuf); |
| 1523 | |
| 1524 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1525 | } |
| 1526 | |
| 1527 | static int |
| 1528 | sparc32_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type) |
| 1529 | { |
| 1530 | return (sparc_structure_or_union_p (type) |
| 1531 | || (sparc_floating_p (type) && TYPE_LENGTH (type) == 16) |
| 1532 | || sparc_complex_floating_p (type)); |
| 1533 | } |
| 1534 | |
| 1535 | static int |
| 1536 | sparc32_dwarf2_struct_return_p (struct frame_info *this_frame) |
| 1537 | { |
| 1538 | CORE_ADDR pc = get_frame_address_in_block (this_frame); |
| 1539 | struct symbol *sym = find_pc_function (pc); |
| 1540 | |
| 1541 | if (sym) |
| 1542 | return sparc32_struct_return_from_sym (sym); |
| 1543 | return 0; |
| 1544 | } |
| 1545 | |
| 1546 | static void |
| 1547 | sparc32_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, |
| 1548 | struct dwarf2_frame_state_reg *reg, |
| 1549 | struct frame_info *this_frame) |
| 1550 | { |
| 1551 | int off; |
| 1552 | |
| 1553 | switch (regnum) |
| 1554 | { |
| 1555 | case SPARC_G0_REGNUM: |
| 1556 | /* Since %g0 is always zero, there is no point in saving it, and |
| 1557 | people will be inclined omit it from the CFI. Make sure we |
| 1558 | don't warn about that. */ |
| 1559 | reg->how = DWARF2_FRAME_REG_SAME_VALUE; |
| 1560 | break; |
| 1561 | case SPARC_SP_REGNUM: |
| 1562 | reg->how = DWARF2_FRAME_REG_CFA; |
| 1563 | break; |
| 1564 | case SPARC32_PC_REGNUM: |
| 1565 | case SPARC32_NPC_REGNUM: |
| 1566 | reg->how = DWARF2_FRAME_REG_RA_OFFSET; |
| 1567 | off = 8; |
| 1568 | if (sparc32_dwarf2_struct_return_p (this_frame)) |
| 1569 | off += 4; |
| 1570 | if (regnum == SPARC32_NPC_REGNUM) |
| 1571 | off += 4; |
| 1572 | reg->loc.offset = off; |
| 1573 | break; |
| 1574 | } |
| 1575 | } |
| 1576 | |
| 1577 | /* Implement the execute_dwarf_cfa_vendor_op method. */ |
| 1578 | |
| 1579 | static bool |
| 1580 | sparc_execute_dwarf_cfa_vendor_op (struct gdbarch *gdbarch, gdb_byte op, |
| 1581 | struct dwarf2_frame_state *fs) |
| 1582 | { |
| 1583 | /* Only DW_CFA_GNU_window_save is expected on SPARC. */ |
| 1584 | if (op != DW_CFA_GNU_window_save) |
| 1585 | return false; |
| 1586 | |
| 1587 | uint64_t reg; |
| 1588 | int size = register_size (gdbarch, 0); |
| 1589 | |
| 1590 | fs->regs.alloc_regs (32); |
| 1591 | for (reg = 8; reg < 16; reg++) |
| 1592 | { |
| 1593 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG; |
| 1594 | fs->regs.reg[reg].loc.reg = reg + 16; |
| 1595 | } |
| 1596 | for (reg = 16; reg < 32; reg++) |
| 1597 | { |
| 1598 | fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET; |
| 1599 | fs->regs.reg[reg].loc.offset = (reg - 16) * size; |
| 1600 | } |
| 1601 | |
| 1602 | return true; |
| 1603 | } |
| 1604 | |
| 1605 | \f |
| 1606 | /* The SPARC Architecture doesn't have hardware single-step support, |
| 1607 | and most operating systems don't implement it either, so we provide |
| 1608 | software single-step mechanism. */ |
| 1609 | |
| 1610 | static CORE_ADDR |
| 1611 | sparc_analyze_control_transfer (struct regcache *regcache, |
| 1612 | CORE_ADDR pc, CORE_ADDR *npc) |
| 1613 | { |
| 1614 | unsigned long insn = sparc_fetch_instruction (pc); |
| 1615 | int conditional_p = X_COND (insn) & 0x7; |
| 1616 | int branch_p = 0, fused_p = 0; |
| 1617 | long offset = 0; /* Must be signed for sign-extend. */ |
| 1618 | |
| 1619 | if (X_OP (insn) == 0 && X_OP2 (insn) == 3) |
| 1620 | { |
| 1621 | if ((insn & 0x10000000) == 0) |
| 1622 | { |
| 1623 | /* Branch on Integer Register with Prediction (BPr). */ |
| 1624 | branch_p = 1; |
| 1625 | conditional_p = 1; |
| 1626 | } |
| 1627 | else |
| 1628 | { |
| 1629 | /* Compare and Branch */ |
| 1630 | branch_p = 1; |
| 1631 | fused_p = 1; |
| 1632 | offset = 4 * X_DISP10 (insn); |
| 1633 | } |
| 1634 | } |
| 1635 | else if (X_OP (insn) == 0 && X_OP2 (insn) == 6) |
| 1636 | { |
| 1637 | /* Branch on Floating-Point Condition Codes (FBfcc). */ |
| 1638 | branch_p = 1; |
| 1639 | offset = 4 * X_DISP22 (insn); |
| 1640 | } |
| 1641 | else if (X_OP (insn) == 0 && X_OP2 (insn) == 5) |
| 1642 | { |
| 1643 | /* Branch on Floating-Point Condition Codes with Prediction |
| 1644 | (FBPfcc). */ |
| 1645 | branch_p = 1; |
| 1646 | offset = 4 * X_DISP19 (insn); |
| 1647 | } |
| 1648 | else if (X_OP (insn) == 0 && X_OP2 (insn) == 2) |
| 1649 | { |
| 1650 | /* Branch on Integer Condition Codes (Bicc). */ |
| 1651 | branch_p = 1; |
| 1652 | offset = 4 * X_DISP22 (insn); |
| 1653 | } |
| 1654 | else if (X_OP (insn) == 0 && X_OP2 (insn) == 1) |
| 1655 | { |
| 1656 | /* Branch on Integer Condition Codes with Prediction (BPcc). */ |
| 1657 | branch_p = 1; |
| 1658 | offset = 4 * X_DISP19 (insn); |
| 1659 | } |
| 1660 | else if (X_OP (insn) == 2 && X_OP3 (insn) == 0x3a) |
| 1661 | { |
| 1662 | struct frame_info *frame = get_current_frame (); |
| 1663 | |
| 1664 | /* Trap instruction (TRAP). */ |
| 1665 | return gdbarch_tdep (regcache->arch ())->step_trap (frame, |
| 1666 | insn); |
| 1667 | } |
| 1668 | |
| 1669 | /* FIXME: Handle DONE and RETRY instructions. */ |
| 1670 | |
| 1671 | if (branch_p) |
| 1672 | { |
| 1673 | if (fused_p) |
| 1674 | { |
| 1675 | /* Fused compare-and-branch instructions are non-delayed, |
| 1676 | and do not have an annuling capability. So we need to |
| 1677 | always set a breakpoint on both the NPC and the branch |
| 1678 | target address. */ |
| 1679 | gdb_assert (offset != 0); |
| 1680 | return pc + offset; |
| 1681 | } |
| 1682 | else if (conditional_p) |
| 1683 | { |
| 1684 | /* For conditional branches, return nPC + 4 iff the annul |
| 1685 | bit is 1. */ |
| 1686 | return (X_A (insn) ? *npc + 4 : 0); |
| 1687 | } |
| 1688 | else |
| 1689 | { |
| 1690 | /* For unconditional branches, return the target if its |
| 1691 | specified condition is "always" and return nPC + 4 if the |
| 1692 | condition is "never". If the annul bit is 1, set *NPC to |
| 1693 | zero. */ |
| 1694 | if (X_COND (insn) == 0x0) |
| 1695 | pc = *npc, offset = 4; |
| 1696 | if (X_A (insn)) |
| 1697 | *npc = 0; |
| 1698 | |
| 1699 | return pc + offset; |
| 1700 | } |
| 1701 | } |
| 1702 | |
| 1703 | return 0; |
| 1704 | } |
| 1705 | |
| 1706 | static CORE_ADDR |
| 1707 | sparc_step_trap (struct frame_info *frame, unsigned long insn) |
| 1708 | { |
| 1709 | return 0; |
| 1710 | } |
| 1711 | |
| 1712 | static std::vector<CORE_ADDR> |
| 1713 | sparc_software_single_step (struct regcache *regcache) |
| 1714 | { |
| 1715 | struct gdbarch *arch = regcache->arch (); |
| 1716 | struct gdbarch_tdep *tdep = gdbarch_tdep (arch); |
| 1717 | CORE_ADDR npc, nnpc; |
| 1718 | |
| 1719 | CORE_ADDR pc, orig_npc; |
| 1720 | std::vector<CORE_ADDR> next_pcs; |
| 1721 | |
| 1722 | pc = regcache_raw_get_unsigned (regcache, tdep->pc_regnum); |
| 1723 | orig_npc = npc = regcache_raw_get_unsigned (regcache, tdep->npc_regnum); |
| 1724 | |
| 1725 | /* Analyze the instruction at PC. */ |
| 1726 | nnpc = sparc_analyze_control_transfer (regcache, pc, &npc); |
| 1727 | if (npc != 0) |
| 1728 | next_pcs.push_back (npc); |
| 1729 | |
| 1730 | if (nnpc != 0) |
| 1731 | next_pcs.push_back (nnpc); |
| 1732 | |
| 1733 | /* Assert that we have set at least one breakpoint, and that |
| 1734 | they're not set at the same spot - unless we're going |
| 1735 | from here straight to NULL, i.e. a call or jump to 0. */ |
| 1736 | gdb_assert (npc != 0 || nnpc != 0 || orig_npc == 0); |
| 1737 | gdb_assert (nnpc != npc || orig_npc == 0); |
| 1738 | |
| 1739 | return next_pcs; |
| 1740 | } |
| 1741 | |
| 1742 | static void |
| 1743 | sparc_write_pc (struct regcache *regcache, CORE_ADDR pc) |
| 1744 | { |
| 1745 | struct gdbarch_tdep *tdep = gdbarch_tdep (regcache->arch ()); |
| 1746 | |
| 1747 | regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc); |
| 1748 | regcache_cooked_write_unsigned (regcache, tdep->npc_regnum, pc + 4); |
| 1749 | } |
| 1750 | \f |
| 1751 | |
| 1752 | /* Iterate over core file register note sections. */ |
| 1753 | |
| 1754 | static void |
| 1755 | sparc_iterate_over_regset_sections (struct gdbarch *gdbarch, |
| 1756 | iterate_over_regset_sections_cb *cb, |
| 1757 | void *cb_data, |
| 1758 | const struct regcache *regcache) |
| 1759 | { |
| 1760 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1761 | |
| 1762 | cb (".reg", tdep->sizeof_gregset, tdep->gregset, NULL, cb_data); |
| 1763 | cb (".reg2", tdep->sizeof_fpregset, tdep->fpregset, NULL, cb_data); |
| 1764 | } |
| 1765 | \f |
| 1766 | |
| 1767 | static int |
| 1768 | validate_tdesc_registers (const struct target_desc *tdesc, |
| 1769 | struct tdesc_arch_data *tdesc_data, |
| 1770 | const char *feature_name, |
| 1771 | const char *register_names[], |
| 1772 | unsigned int registers_num, |
| 1773 | unsigned int reg_start) |
| 1774 | { |
| 1775 | int valid_p = 1; |
| 1776 | const struct tdesc_feature *feature; |
| 1777 | |
| 1778 | feature = tdesc_find_feature (tdesc, feature_name); |
| 1779 | if (feature == NULL) |
| 1780 | return 0; |
| 1781 | |
| 1782 | for (unsigned int i = 0; i < registers_num; i++) |
| 1783 | valid_p &= tdesc_numbered_register (feature, tdesc_data, |
| 1784 | reg_start + i, |
| 1785 | register_names[i]); |
| 1786 | |
| 1787 | return valid_p; |
| 1788 | } |
| 1789 | |
| 1790 | static struct gdbarch * |
| 1791 | sparc32_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 1792 | { |
| 1793 | struct gdbarch_tdep *tdep; |
| 1794 | const struct target_desc *tdesc = info.target_desc; |
| 1795 | struct gdbarch *gdbarch; |
| 1796 | int valid_p = 1; |
| 1797 | |
| 1798 | /* If there is already a candidate, use it. */ |
| 1799 | arches = gdbarch_list_lookup_by_info (arches, &info); |
| 1800 | if (arches != NULL) |
| 1801 | return arches->gdbarch; |
| 1802 | |
| 1803 | /* Allocate space for the new architecture. */ |
| 1804 | tdep = XCNEW (struct gdbarch_tdep); |
| 1805 | gdbarch = gdbarch_alloc (&info, tdep); |
| 1806 | |
| 1807 | tdep->pc_regnum = SPARC32_PC_REGNUM; |
| 1808 | tdep->npc_regnum = SPARC32_NPC_REGNUM; |
| 1809 | tdep->step_trap = sparc_step_trap; |
| 1810 | tdep->fpu_register_names = sparc32_fpu_register_names; |
| 1811 | tdep->fpu_registers_num = ARRAY_SIZE (sparc32_fpu_register_names); |
| 1812 | tdep->cp0_register_names = sparc32_cp0_register_names; |
| 1813 | tdep->cp0_registers_num = ARRAY_SIZE (sparc32_cp0_register_names); |
| 1814 | |
| 1815 | set_gdbarch_long_double_bit (gdbarch, 128); |
| 1816 | set_gdbarch_long_double_format (gdbarch, floatformats_sparc_quad); |
| 1817 | |
| 1818 | set_gdbarch_wchar_bit (gdbarch, 16); |
| 1819 | set_gdbarch_wchar_signed (gdbarch, 1); |
| 1820 | |
| 1821 | set_gdbarch_num_regs (gdbarch, SPARC32_NUM_REGS); |
| 1822 | set_gdbarch_register_name (gdbarch, sparc32_register_name); |
| 1823 | set_gdbarch_register_type (gdbarch, sparc32_register_type); |
| 1824 | set_gdbarch_num_pseudo_regs (gdbarch, SPARC32_NUM_PSEUDO_REGS); |
| 1825 | set_tdesc_pseudo_register_name (gdbarch, sparc32_pseudo_register_name); |
| 1826 | set_tdesc_pseudo_register_type (gdbarch, sparc32_pseudo_register_type); |
| 1827 | set_gdbarch_pseudo_register_read (gdbarch, sparc32_pseudo_register_read); |
| 1828 | set_gdbarch_pseudo_register_write (gdbarch, sparc32_pseudo_register_write); |
| 1829 | |
| 1830 | /* Register numbers of various important registers. */ |
| 1831 | set_gdbarch_sp_regnum (gdbarch, SPARC_SP_REGNUM); /* %sp */ |
| 1832 | set_gdbarch_pc_regnum (gdbarch, SPARC32_PC_REGNUM); /* %pc */ |
| 1833 | set_gdbarch_fp0_regnum (gdbarch, SPARC_F0_REGNUM); /* %f0 */ |
| 1834 | |
| 1835 | /* Call dummy code. */ |
| 1836 | set_gdbarch_frame_align (gdbarch, sparc32_frame_align); |
| 1837 | set_gdbarch_call_dummy_location (gdbarch, ON_STACK); |
| 1838 | set_gdbarch_push_dummy_code (gdbarch, sparc32_push_dummy_code); |
| 1839 | set_gdbarch_push_dummy_call (gdbarch, sparc32_push_dummy_call); |
| 1840 | |
| 1841 | set_gdbarch_return_value (gdbarch, sparc32_return_value); |
| 1842 | set_gdbarch_stabs_argument_has_addr |
| 1843 | (gdbarch, sparc32_stabs_argument_has_addr); |
| 1844 | |
| 1845 | set_gdbarch_skip_prologue (gdbarch, sparc32_skip_prologue); |
| 1846 | |
| 1847 | /* Stack grows downward. */ |
| 1848 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 1849 | |
| 1850 | set_gdbarch_breakpoint_kind_from_pc (gdbarch, |
| 1851 | sparc_breakpoint::kind_from_pc); |
| 1852 | set_gdbarch_sw_breakpoint_from_kind (gdbarch, |
| 1853 | sparc_breakpoint::bp_from_kind); |
| 1854 | |
| 1855 | set_gdbarch_frame_args_skip (gdbarch, 8); |
| 1856 | |
| 1857 | set_gdbarch_software_single_step (gdbarch, sparc_software_single_step); |
| 1858 | set_gdbarch_write_pc (gdbarch, sparc_write_pc); |
| 1859 | |
| 1860 | set_gdbarch_dummy_id (gdbarch, sparc_dummy_id); |
| 1861 | |
| 1862 | set_gdbarch_unwind_pc (gdbarch, sparc_unwind_pc); |
| 1863 | |
| 1864 | frame_base_set_default (gdbarch, &sparc32_frame_base); |
| 1865 | |
| 1866 | /* Hook in the DWARF CFI frame unwinder. */ |
| 1867 | dwarf2_frame_set_init_reg (gdbarch, sparc32_dwarf2_frame_init_reg); |
| 1868 | /* Register DWARF vendor CFI handler. */ |
| 1869 | set_gdbarch_execute_dwarf_cfa_vendor_op (gdbarch, |
| 1870 | sparc_execute_dwarf_cfa_vendor_op); |
| 1871 | /* FIXME: kettenis/20050423: Don't enable the unwinder until the |
| 1872 | StackGhost issues have been resolved. */ |
| 1873 | |
| 1874 | /* Hook in ABI-specific overrides, if they have been registered. */ |
| 1875 | gdbarch_init_osabi (info, gdbarch); |
| 1876 | |
| 1877 | frame_unwind_append_unwinder (gdbarch, &sparc32_frame_unwind); |
| 1878 | |
| 1879 | if (tdesc_has_registers (tdesc)) |
| 1880 | { |
| 1881 | struct tdesc_arch_data *tdesc_data = tdesc_data_alloc (); |
| 1882 | |
| 1883 | /* Validate that the descriptor provides the mandatory registers |
| 1884 | and allocate their numbers. */ |
| 1885 | valid_p &= validate_tdesc_registers (tdesc, tdesc_data, |
| 1886 | "org.gnu.gdb.sparc.cpu", |
| 1887 | sparc_core_register_names, |
| 1888 | ARRAY_SIZE (sparc_core_register_names), |
| 1889 | SPARC_G0_REGNUM); |
| 1890 | valid_p &= validate_tdesc_registers (tdesc, tdesc_data, |
| 1891 | "org.gnu.gdb.sparc.fpu", |
| 1892 | tdep->fpu_register_names, |
| 1893 | tdep->fpu_registers_num, |
| 1894 | SPARC_F0_REGNUM); |
| 1895 | valid_p &= validate_tdesc_registers (tdesc, tdesc_data, |
| 1896 | "org.gnu.gdb.sparc.cp0", |
| 1897 | tdep->cp0_register_names, |
| 1898 | tdep->cp0_registers_num, |
| 1899 | SPARC_F0_REGNUM |
| 1900 | + tdep->fpu_registers_num); |
| 1901 | if (!valid_p) |
| 1902 | { |
| 1903 | tdesc_data_cleanup (tdesc_data); |
| 1904 | return NULL; |
| 1905 | } |
| 1906 | |
| 1907 | /* Target description may have changed. */ |
| 1908 | info.tdesc_data = tdesc_data; |
| 1909 | tdesc_use_registers (gdbarch, tdesc, tdesc_data); |
| 1910 | } |
| 1911 | |
| 1912 | /* If we have register sets, enable the generic core file support. */ |
| 1913 | if (tdep->gregset) |
| 1914 | set_gdbarch_iterate_over_regset_sections |
| 1915 | (gdbarch, sparc_iterate_over_regset_sections); |
| 1916 | |
| 1917 | register_sparc_ravenscar_ops (gdbarch); |
| 1918 | |
| 1919 | return gdbarch; |
| 1920 | } |
| 1921 | \f |
| 1922 | /* Helper functions for dealing with register windows. */ |
| 1923 | |
| 1924 | void |
| 1925 | sparc_supply_rwindow (struct regcache *regcache, CORE_ADDR sp, int regnum) |
| 1926 | { |
| 1927 | struct gdbarch *gdbarch = regcache->arch (); |
| 1928 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 1929 | int offset = 0; |
| 1930 | gdb_byte buf[8]; |
| 1931 | int i; |
| 1932 | |
| 1933 | if (sp & 1) |
| 1934 | { |
| 1935 | /* Registers are 64-bit. */ |
| 1936 | sp += BIAS; |
| 1937 | |
| 1938 | for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++) |
| 1939 | { |
| 1940 | if (regnum == i || regnum == -1) |
| 1941 | { |
| 1942 | target_read_memory (sp + ((i - SPARC_L0_REGNUM) * 8), buf, 8); |
| 1943 | |
| 1944 | /* Handle StackGhost. */ |
| 1945 | if (i == SPARC_I7_REGNUM) |
| 1946 | { |
| 1947 | ULONGEST wcookie = sparc_fetch_wcookie (gdbarch); |
| 1948 | ULONGEST i7; |
| 1949 | |
| 1950 | i7 = extract_unsigned_integer (buf + offset, 8, byte_order); |
| 1951 | store_unsigned_integer (buf + offset, 8, byte_order, |
| 1952 | i7 ^ wcookie); |
| 1953 | } |
| 1954 | |
| 1955 | regcache_raw_supply (regcache, i, buf); |
| 1956 | } |
| 1957 | } |
| 1958 | } |
| 1959 | else |
| 1960 | { |
| 1961 | /* Registers are 32-bit. Toss any sign-extension of the stack |
| 1962 | pointer. */ |
| 1963 | sp &= 0xffffffffUL; |
| 1964 | |
| 1965 | /* Clear out the top half of the temporary buffer, and put the |
| 1966 | register value in the bottom half if we're in 64-bit mode. */ |
| 1967 | if (gdbarch_ptr_bit (regcache->arch ()) == 64) |
| 1968 | { |
| 1969 | memset (buf, 0, 4); |
| 1970 | offset = 4; |
| 1971 | } |
| 1972 | |
| 1973 | for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++) |
| 1974 | { |
| 1975 | if (regnum == i || regnum == -1) |
| 1976 | { |
| 1977 | target_read_memory (sp + ((i - SPARC_L0_REGNUM) * 4), |
| 1978 | buf + offset, 4); |
| 1979 | |
| 1980 | /* Handle StackGhost. */ |
| 1981 | if (i == SPARC_I7_REGNUM) |
| 1982 | { |
| 1983 | ULONGEST wcookie = sparc_fetch_wcookie (gdbarch); |
| 1984 | ULONGEST i7; |
| 1985 | |
| 1986 | i7 = extract_unsigned_integer (buf + offset, 4, byte_order); |
| 1987 | store_unsigned_integer (buf + offset, 4, byte_order, |
| 1988 | i7 ^ wcookie); |
| 1989 | } |
| 1990 | |
| 1991 | regcache_raw_supply (regcache, i, buf); |
| 1992 | } |
| 1993 | } |
| 1994 | } |
| 1995 | } |
| 1996 | |
| 1997 | void |
| 1998 | sparc_collect_rwindow (const struct regcache *regcache, |
| 1999 | CORE_ADDR sp, int regnum) |
| 2000 | { |
| 2001 | struct gdbarch *gdbarch = regcache->arch (); |
| 2002 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 2003 | int offset = 0; |
| 2004 | gdb_byte buf[8]; |
| 2005 | int i; |
| 2006 | |
| 2007 | if (sp & 1) |
| 2008 | { |
| 2009 | /* Registers are 64-bit. */ |
| 2010 | sp += BIAS; |
| 2011 | |
| 2012 | for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++) |
| 2013 | { |
| 2014 | if (regnum == -1 || regnum == SPARC_SP_REGNUM || regnum == i) |
| 2015 | { |
| 2016 | regcache_raw_collect (regcache, i, buf); |
| 2017 | |
| 2018 | /* Handle StackGhost. */ |
| 2019 | if (i == SPARC_I7_REGNUM) |
| 2020 | { |
| 2021 | ULONGEST wcookie = sparc_fetch_wcookie (gdbarch); |
| 2022 | ULONGEST i7; |
| 2023 | |
| 2024 | i7 = extract_unsigned_integer (buf + offset, 8, byte_order); |
| 2025 | store_unsigned_integer (buf, 8, byte_order, i7 ^ wcookie); |
| 2026 | } |
| 2027 | |
| 2028 | target_write_memory (sp + ((i - SPARC_L0_REGNUM) * 8), buf, 8); |
| 2029 | } |
| 2030 | } |
| 2031 | } |
| 2032 | else |
| 2033 | { |
| 2034 | /* Registers are 32-bit. Toss any sign-extension of the stack |
| 2035 | pointer. */ |
| 2036 | sp &= 0xffffffffUL; |
| 2037 | |
| 2038 | /* Only use the bottom half if we're in 64-bit mode. */ |
| 2039 | if (gdbarch_ptr_bit (regcache->arch ()) == 64) |
| 2040 | offset = 4; |
| 2041 | |
| 2042 | for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++) |
| 2043 | { |
| 2044 | if (regnum == -1 || regnum == SPARC_SP_REGNUM || regnum == i) |
| 2045 | { |
| 2046 | regcache_raw_collect (regcache, i, buf); |
| 2047 | |
| 2048 | /* Handle StackGhost. */ |
| 2049 | if (i == SPARC_I7_REGNUM) |
| 2050 | { |
| 2051 | ULONGEST wcookie = sparc_fetch_wcookie (gdbarch); |
| 2052 | ULONGEST i7; |
| 2053 | |
| 2054 | i7 = extract_unsigned_integer (buf + offset, 4, byte_order); |
| 2055 | store_unsigned_integer (buf + offset, 4, byte_order, |
| 2056 | i7 ^ wcookie); |
| 2057 | } |
| 2058 | |
| 2059 | target_write_memory (sp + ((i - SPARC_L0_REGNUM) * 4), |
| 2060 | buf + offset, 4); |
| 2061 | } |
| 2062 | } |
| 2063 | } |
| 2064 | } |
| 2065 | |
| 2066 | /* Helper functions for dealing with register sets. */ |
| 2067 | |
| 2068 | void |
| 2069 | sparc32_supply_gregset (const struct sparc_gregmap *gregmap, |
| 2070 | struct regcache *regcache, |
| 2071 | int regnum, const void *gregs) |
| 2072 | { |
| 2073 | const gdb_byte *regs = (const gdb_byte *) gregs; |
| 2074 | gdb_byte zero[4] = { 0 }; |
| 2075 | int i; |
| 2076 | |
| 2077 | if (regnum == SPARC32_PSR_REGNUM || regnum == -1) |
| 2078 | regcache_raw_supply (regcache, SPARC32_PSR_REGNUM, |
| 2079 | regs + gregmap->r_psr_offset); |
| 2080 | |
| 2081 | if (regnum == SPARC32_PC_REGNUM || regnum == -1) |
| 2082 | regcache_raw_supply (regcache, SPARC32_PC_REGNUM, |
| 2083 | regs + gregmap->r_pc_offset); |
| 2084 | |
| 2085 | if (regnum == SPARC32_NPC_REGNUM || regnum == -1) |
| 2086 | regcache_raw_supply (regcache, SPARC32_NPC_REGNUM, |
| 2087 | regs + gregmap->r_npc_offset); |
| 2088 | |
| 2089 | if (regnum == SPARC32_Y_REGNUM || regnum == -1) |
| 2090 | regcache_raw_supply (regcache, SPARC32_Y_REGNUM, |
| 2091 | regs + gregmap->r_y_offset); |
| 2092 | |
| 2093 | if (regnum == SPARC_G0_REGNUM || regnum == -1) |
| 2094 | regcache_raw_supply (regcache, SPARC_G0_REGNUM, &zero); |
| 2095 | |
| 2096 | if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_O7_REGNUM) || regnum == -1) |
| 2097 | { |
| 2098 | int offset = gregmap->r_g1_offset; |
| 2099 | |
| 2100 | for (i = SPARC_G1_REGNUM; i <= SPARC_O7_REGNUM; i++) |
| 2101 | { |
| 2102 | if (regnum == i || regnum == -1) |
| 2103 | regcache_raw_supply (regcache, i, regs + offset); |
| 2104 | offset += 4; |
| 2105 | } |
| 2106 | } |
| 2107 | |
| 2108 | if ((regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM) || regnum == -1) |
| 2109 | { |
| 2110 | /* Not all of the register set variants include Locals and |
| 2111 | Inputs. For those that don't, we read them off the stack. */ |
| 2112 | if (gregmap->r_l0_offset == -1) |
| 2113 | { |
| 2114 | ULONGEST sp; |
| 2115 | |
| 2116 | regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp); |
| 2117 | sparc_supply_rwindow (regcache, sp, regnum); |
| 2118 | } |
| 2119 | else |
| 2120 | { |
| 2121 | int offset = gregmap->r_l0_offset; |
| 2122 | |
| 2123 | for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++) |
| 2124 | { |
| 2125 | if (regnum == i || regnum == -1) |
| 2126 | regcache_raw_supply (regcache, i, regs + offset); |
| 2127 | offset += 4; |
| 2128 | } |
| 2129 | } |
| 2130 | } |
| 2131 | } |
| 2132 | |
| 2133 | void |
| 2134 | sparc32_collect_gregset (const struct sparc_gregmap *gregmap, |
| 2135 | const struct regcache *regcache, |
| 2136 | int regnum, void *gregs) |
| 2137 | { |
| 2138 | gdb_byte *regs = (gdb_byte *) gregs; |
| 2139 | int i; |
| 2140 | |
| 2141 | if (regnum == SPARC32_PSR_REGNUM || regnum == -1) |
| 2142 | regcache_raw_collect (regcache, SPARC32_PSR_REGNUM, |
| 2143 | regs + gregmap->r_psr_offset); |
| 2144 | |
| 2145 | if (regnum == SPARC32_PC_REGNUM || regnum == -1) |
| 2146 | regcache_raw_collect (regcache, SPARC32_PC_REGNUM, |
| 2147 | regs + gregmap->r_pc_offset); |
| 2148 | |
| 2149 | if (regnum == SPARC32_NPC_REGNUM || regnum == -1) |
| 2150 | regcache_raw_collect (regcache, SPARC32_NPC_REGNUM, |
| 2151 | regs + gregmap->r_npc_offset); |
| 2152 | |
| 2153 | if (regnum == SPARC32_Y_REGNUM || regnum == -1) |
| 2154 | regcache_raw_collect (regcache, SPARC32_Y_REGNUM, |
| 2155 | regs + gregmap->r_y_offset); |
| 2156 | |
| 2157 | if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_O7_REGNUM) || regnum == -1) |
| 2158 | { |
| 2159 | int offset = gregmap->r_g1_offset; |
| 2160 | |
| 2161 | /* %g0 is always zero. */ |
| 2162 | for (i = SPARC_G1_REGNUM; i <= SPARC_O7_REGNUM; i++) |
| 2163 | { |
| 2164 | if (regnum == i || regnum == -1) |
| 2165 | regcache_raw_collect (regcache, i, regs + offset); |
| 2166 | offset += 4; |
| 2167 | } |
| 2168 | } |
| 2169 | |
| 2170 | if ((regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM) || regnum == -1) |
| 2171 | { |
| 2172 | /* Not all of the register set variants include Locals and |
| 2173 | Inputs. For those that don't, we read them off the stack. */ |
| 2174 | if (gregmap->r_l0_offset != -1) |
| 2175 | { |
| 2176 | int offset = gregmap->r_l0_offset; |
| 2177 | |
| 2178 | for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++) |
| 2179 | { |
| 2180 | if (regnum == i || regnum == -1) |
| 2181 | regcache_raw_collect (regcache, i, regs + offset); |
| 2182 | offset += 4; |
| 2183 | } |
| 2184 | } |
| 2185 | } |
| 2186 | } |
| 2187 | |
| 2188 | void |
| 2189 | sparc32_supply_fpregset (const struct sparc_fpregmap *fpregmap, |
| 2190 | struct regcache *regcache, |
| 2191 | int regnum, const void *fpregs) |
| 2192 | { |
| 2193 | const gdb_byte *regs = (const gdb_byte *) fpregs; |
| 2194 | int i; |
| 2195 | |
| 2196 | for (i = 0; i < 32; i++) |
| 2197 | { |
| 2198 | if (regnum == (SPARC_F0_REGNUM + i) || regnum == -1) |
| 2199 | regcache_raw_supply (regcache, SPARC_F0_REGNUM + i, |
| 2200 | regs + fpregmap->r_f0_offset + (i * 4)); |
| 2201 | } |
| 2202 | |
| 2203 | if (regnum == SPARC32_FSR_REGNUM || regnum == -1) |
| 2204 | regcache_raw_supply (regcache, SPARC32_FSR_REGNUM, |
| 2205 | regs + fpregmap->r_fsr_offset); |
| 2206 | } |
| 2207 | |
| 2208 | void |
| 2209 | sparc32_collect_fpregset (const struct sparc_fpregmap *fpregmap, |
| 2210 | const struct regcache *regcache, |
| 2211 | int regnum, void *fpregs) |
| 2212 | { |
| 2213 | gdb_byte *regs = (gdb_byte *) fpregs; |
| 2214 | int i; |
| 2215 | |
| 2216 | for (i = 0; i < 32; i++) |
| 2217 | { |
| 2218 | if (regnum == (SPARC_F0_REGNUM + i) || regnum == -1) |
| 2219 | regcache_raw_collect (regcache, SPARC_F0_REGNUM + i, |
| 2220 | regs + fpregmap->r_f0_offset + (i * 4)); |
| 2221 | } |
| 2222 | |
| 2223 | if (regnum == SPARC32_FSR_REGNUM || regnum == -1) |
| 2224 | regcache_raw_collect (regcache, SPARC32_FSR_REGNUM, |
| 2225 | regs + fpregmap->r_fsr_offset); |
| 2226 | } |
| 2227 | \f |
| 2228 | |
| 2229 | /* SunOS 4. */ |
| 2230 | |
| 2231 | /* From <machine/reg.h>. */ |
| 2232 | const struct sparc_gregmap sparc32_sunos4_gregmap = |
| 2233 | { |
| 2234 | 0 * 4, /* %psr */ |
| 2235 | 1 * 4, /* %pc */ |
| 2236 | 2 * 4, /* %npc */ |
| 2237 | 3 * 4, /* %y */ |
| 2238 | -1, /* %wim */ |
| 2239 | -1, /* %tbr */ |
| 2240 | 4 * 4, /* %g1 */ |
| 2241 | -1 /* %l0 */ |
| 2242 | }; |
| 2243 | |
| 2244 | const struct sparc_fpregmap sparc32_sunos4_fpregmap = |
| 2245 | { |
| 2246 | 0 * 4, /* %f0 */ |
| 2247 | 33 * 4, /* %fsr */ |
| 2248 | }; |
| 2249 | |
| 2250 | const struct sparc_fpregmap sparc32_bsd_fpregmap = |
| 2251 | { |
| 2252 | 0 * 4, /* %f0 */ |
| 2253 | 32 * 4, /* %fsr */ |
| 2254 | }; |
| 2255 | |
| 2256 | void |
| 2257 | _initialize_sparc_tdep (void) |
| 2258 | { |
| 2259 | register_gdbarch_init (bfd_arch_sparc, sparc32_gdbarch_init); |
| 2260 | } |