| 1 | /* Target-dependent code for the MIPS architecture, for GDB, the GNU Debugger. |
| 2 | |
| 3 | Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, |
| 4 | 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software |
| 5 | Foundation, Inc. |
| 6 | |
| 7 | Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU |
| 8 | and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin. |
| 9 | |
| 10 | This file is part of GDB. |
| 11 | |
| 12 | This program is free software; you can redistribute it and/or modify |
| 13 | it under the terms of the GNU General Public License as published by |
| 14 | the Free Software Foundation; either version 2 of the License, or |
| 15 | (at your option) any later version. |
| 16 | |
| 17 | This program is distributed in the hope that it will be useful, |
| 18 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | GNU General Public License for more details. |
| 21 | |
| 22 | You should have received a copy of the GNU General Public License |
| 23 | along with this program; if not, write to the Free Software |
| 24 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 25 | Boston, MA 02111-1307, USA. */ |
| 26 | |
| 27 | #include "defs.h" |
| 28 | #include "gdb_string.h" |
| 29 | #include "gdb_assert.h" |
| 30 | #include "frame.h" |
| 31 | #include "inferior.h" |
| 32 | #include "symtab.h" |
| 33 | #include "value.h" |
| 34 | #include "gdbcmd.h" |
| 35 | #include "language.h" |
| 36 | #include "gdbcore.h" |
| 37 | #include "symfile.h" |
| 38 | #include "objfiles.h" |
| 39 | #include "gdbtypes.h" |
| 40 | #include "target.h" |
| 41 | #include "arch-utils.h" |
| 42 | #include "regcache.h" |
| 43 | #include "osabi.h" |
| 44 | #include "mips-tdep.h" |
| 45 | #include "block.h" |
| 46 | #include "reggroups.h" |
| 47 | #include "opcode/mips.h" |
| 48 | #include "elf/mips.h" |
| 49 | #include "elf-bfd.h" |
| 50 | #include "symcat.h" |
| 51 | #include "sim-regno.h" |
| 52 | #include "dis-asm.h" |
| 53 | #include "frame-unwind.h" |
| 54 | #include "frame-base.h" |
| 55 | #include "trad-frame.h" |
| 56 | #include "infcall.h" |
| 57 | #include "floatformat.h" |
| 58 | |
| 59 | static const struct objfile_data *mips_pdr_data; |
| 60 | |
| 61 | static struct type *mips_register_type (struct gdbarch *gdbarch, int regnum); |
| 62 | |
| 63 | /* A useful bit in the CP0 status register (PS_REGNUM). */ |
| 64 | /* This bit is set if we are emulating 32-bit FPRs on a 64-bit chip. */ |
| 65 | #define ST0_FR (1 << 26) |
| 66 | |
| 67 | /* The sizes of floating point registers. */ |
| 68 | |
| 69 | enum |
| 70 | { |
| 71 | MIPS_FPU_SINGLE_REGSIZE = 4, |
| 72 | MIPS_FPU_DOUBLE_REGSIZE = 8 |
| 73 | }; |
| 74 | |
| 75 | |
| 76 | static const char *mips_abi_string; |
| 77 | |
| 78 | static const char *mips_abi_strings[] = { |
| 79 | "auto", |
| 80 | "n32", |
| 81 | "o32", |
| 82 | "n64", |
| 83 | "o64", |
| 84 | "eabi32", |
| 85 | "eabi64", |
| 86 | NULL |
| 87 | }; |
| 88 | |
| 89 | struct frame_extra_info |
| 90 | { |
| 91 | mips_extra_func_info_t proc_desc; |
| 92 | int num_args; |
| 93 | }; |
| 94 | |
| 95 | /* Various MIPS ISA options (related to stack analysis) can be |
| 96 | overridden dynamically. Establish an enum/array for managing |
| 97 | them. */ |
| 98 | |
| 99 | static const char size_auto[] = "auto"; |
| 100 | static const char size_32[] = "32"; |
| 101 | static const char size_64[] = "64"; |
| 102 | |
| 103 | static const char *size_enums[] = { |
| 104 | size_auto, |
| 105 | size_32, |
| 106 | size_64, |
| 107 | 0 |
| 108 | }; |
| 109 | |
| 110 | /* Some MIPS boards don't support floating point while others only |
| 111 | support single-precision floating-point operations. */ |
| 112 | |
| 113 | enum mips_fpu_type |
| 114 | { |
| 115 | MIPS_FPU_DOUBLE, /* Full double precision floating point. */ |
| 116 | MIPS_FPU_SINGLE, /* Single precision floating point (R4650). */ |
| 117 | MIPS_FPU_NONE /* No floating point. */ |
| 118 | }; |
| 119 | |
| 120 | #ifndef MIPS_DEFAULT_FPU_TYPE |
| 121 | #define MIPS_DEFAULT_FPU_TYPE MIPS_FPU_DOUBLE |
| 122 | #endif |
| 123 | static int mips_fpu_type_auto = 1; |
| 124 | static enum mips_fpu_type mips_fpu_type = MIPS_DEFAULT_FPU_TYPE; |
| 125 | |
| 126 | static int mips_debug = 0; |
| 127 | |
| 128 | /* MIPS specific per-architecture information */ |
| 129 | struct gdbarch_tdep |
| 130 | { |
| 131 | /* from the elf header */ |
| 132 | int elf_flags; |
| 133 | |
| 134 | /* mips options */ |
| 135 | enum mips_abi mips_abi; |
| 136 | enum mips_abi found_abi; |
| 137 | enum mips_fpu_type mips_fpu_type; |
| 138 | int mips_last_arg_regnum; |
| 139 | int mips_last_fp_arg_regnum; |
| 140 | int default_mask_address_p; |
| 141 | /* Is the target using 64-bit raw integer registers but only |
| 142 | storing a left-aligned 32-bit value in each? */ |
| 143 | int mips64_transfers_32bit_regs_p; |
| 144 | /* Indexes for various registers. IRIX and embedded have |
| 145 | different values. This contains the "public" fields. Don't |
| 146 | add any that do not need to be public. */ |
| 147 | const struct mips_regnum *regnum; |
| 148 | /* Register names table for the current register set. */ |
| 149 | const char **mips_processor_reg_names; |
| 150 | }; |
| 151 | |
| 152 | static int |
| 153 | n32n64_floatformat_always_valid (const struct floatformat *fmt, |
| 154 | const char *from) |
| 155 | { |
| 156 | return 1; |
| 157 | } |
| 158 | |
| 159 | /* FIXME: brobecker/2004-08-08: Long Double values are 128 bit long. |
| 160 | They are implemented as a pair of 64bit doubles where the high |
| 161 | part holds the result of the operation rounded to double, and |
| 162 | the low double holds the difference between the exact result and |
| 163 | the rounded result. So "high" + "low" contains the result with |
| 164 | added precision. Unfortunately, the floatformat structure used |
| 165 | by GDB is not powerful enough to describe this format. As a temporary |
| 166 | measure, we define a 128bit floatformat that only uses the high part. |
| 167 | We lose a bit of precision but that's probably the best we can do |
| 168 | for now with the current infrastructure. */ |
| 169 | |
| 170 | static const struct floatformat floatformat_n32n64_long_double_big = |
| 171 | { |
| 172 | floatformat_big, 128, 0, 1, 11, 1023, 2047, 12, 52, |
| 173 | floatformat_intbit_no, |
| 174 | "floatformat_ieee_double_big", |
| 175 | n32n64_floatformat_always_valid |
| 176 | }; |
| 177 | |
| 178 | const struct mips_regnum * |
| 179 | mips_regnum (struct gdbarch *gdbarch) |
| 180 | { |
| 181 | return gdbarch_tdep (gdbarch)->regnum; |
| 182 | } |
| 183 | |
| 184 | static int |
| 185 | mips_fpa0_regnum (struct gdbarch *gdbarch) |
| 186 | { |
| 187 | return mips_regnum (gdbarch)->fp0 + 12; |
| 188 | } |
| 189 | |
| 190 | #define MIPS_EABI (gdbarch_tdep (current_gdbarch)->mips_abi == MIPS_ABI_EABI32 \ |
| 191 | || gdbarch_tdep (current_gdbarch)->mips_abi == MIPS_ABI_EABI64) |
| 192 | |
| 193 | #define MIPS_LAST_FP_ARG_REGNUM (gdbarch_tdep (current_gdbarch)->mips_last_fp_arg_regnum) |
| 194 | |
| 195 | #define MIPS_LAST_ARG_REGNUM (gdbarch_tdep (current_gdbarch)->mips_last_arg_regnum) |
| 196 | |
| 197 | #define MIPS_FPU_TYPE (gdbarch_tdep (current_gdbarch)->mips_fpu_type) |
| 198 | |
| 199 | /* MIPS16 function addresses are odd (bit 0 is set). Here are some |
| 200 | functions to test, set, or clear bit 0 of addresses. */ |
| 201 | |
| 202 | static CORE_ADDR |
| 203 | is_mips16_addr (CORE_ADDR addr) |
| 204 | { |
| 205 | return ((addr) & 1); |
| 206 | } |
| 207 | |
| 208 | static CORE_ADDR |
| 209 | make_mips16_addr (CORE_ADDR addr) |
| 210 | { |
| 211 | return ((addr) | 1); |
| 212 | } |
| 213 | |
| 214 | static CORE_ADDR |
| 215 | unmake_mips16_addr (CORE_ADDR addr) |
| 216 | { |
| 217 | return ((addr) & ~1); |
| 218 | } |
| 219 | |
| 220 | /* Return the contents of register REGNUM as a signed integer. */ |
| 221 | |
| 222 | static LONGEST |
| 223 | read_signed_register (int regnum) |
| 224 | { |
| 225 | void *buf = alloca (register_size (current_gdbarch, regnum)); |
| 226 | deprecated_read_register_gen (regnum, buf); |
| 227 | return (extract_signed_integer |
| 228 | (buf, register_size (current_gdbarch, regnum))); |
| 229 | } |
| 230 | |
| 231 | static LONGEST |
| 232 | read_signed_register_pid (int regnum, ptid_t ptid) |
| 233 | { |
| 234 | ptid_t save_ptid; |
| 235 | LONGEST retval; |
| 236 | |
| 237 | if (ptid_equal (ptid, inferior_ptid)) |
| 238 | return read_signed_register (regnum); |
| 239 | |
| 240 | save_ptid = inferior_ptid; |
| 241 | |
| 242 | inferior_ptid = ptid; |
| 243 | |
| 244 | retval = read_signed_register (regnum); |
| 245 | |
| 246 | inferior_ptid = save_ptid; |
| 247 | |
| 248 | return retval; |
| 249 | } |
| 250 | |
| 251 | /* Return the MIPS ABI associated with GDBARCH. */ |
| 252 | enum mips_abi |
| 253 | mips_abi (struct gdbarch *gdbarch) |
| 254 | { |
| 255 | return gdbarch_tdep (gdbarch)->mips_abi; |
| 256 | } |
| 257 | |
| 258 | int |
| 259 | mips_isa_regsize (struct gdbarch *gdbarch) |
| 260 | { |
| 261 | return (gdbarch_bfd_arch_info (gdbarch)->bits_per_word |
| 262 | / gdbarch_bfd_arch_info (gdbarch)->bits_per_byte); |
| 263 | } |
| 264 | |
| 265 | /* Return the currently configured (or set) saved register size. */ |
| 266 | |
| 267 | static const char *mips_abi_regsize_string = size_auto; |
| 268 | |
| 269 | static unsigned int |
| 270 | mips_abi_regsize (struct gdbarch *gdbarch) |
| 271 | { |
| 272 | if (mips_abi_regsize_string == size_auto) |
| 273 | switch (mips_abi (gdbarch)) |
| 274 | { |
| 275 | case MIPS_ABI_EABI32: |
| 276 | case MIPS_ABI_O32: |
| 277 | return 4; |
| 278 | case MIPS_ABI_N32: |
| 279 | case MIPS_ABI_N64: |
| 280 | case MIPS_ABI_O64: |
| 281 | case MIPS_ABI_EABI64: |
| 282 | return 8; |
| 283 | case MIPS_ABI_UNKNOWN: |
| 284 | case MIPS_ABI_LAST: |
| 285 | default: |
| 286 | internal_error (__FILE__, __LINE__, "bad switch"); |
| 287 | } |
| 288 | else if (mips_abi_regsize_string == size_64) |
| 289 | return 8; |
| 290 | else /* if (mips_abi_regsize_string == size_32) */ |
| 291 | return 4; |
| 292 | } |
| 293 | |
| 294 | /* Functions for setting and testing a bit in a minimal symbol that |
| 295 | marks it as 16-bit function. The MSB of the minimal symbol's |
| 296 | "info" field is used for this purpose. |
| 297 | |
| 298 | ELF_MAKE_MSYMBOL_SPECIAL tests whether an ELF symbol is "special", |
| 299 | i.e. refers to a 16-bit function, and sets a "special" bit in a |
| 300 | minimal symbol to mark it as a 16-bit function |
| 301 | |
| 302 | MSYMBOL_IS_SPECIAL tests the "special" bit in a minimal symbol */ |
| 303 | |
| 304 | static void |
| 305 | mips_elf_make_msymbol_special (asymbol * sym, struct minimal_symbol *msym) |
| 306 | { |
| 307 | if (((elf_symbol_type *) (sym))->internal_elf_sym.st_other == STO_MIPS16) |
| 308 | { |
| 309 | MSYMBOL_INFO (msym) = (char *) |
| 310 | (((long) MSYMBOL_INFO (msym)) | 0x80000000); |
| 311 | SYMBOL_VALUE_ADDRESS (msym) |= 1; |
| 312 | } |
| 313 | } |
| 314 | |
| 315 | static int |
| 316 | msymbol_is_special (struct minimal_symbol *msym) |
| 317 | { |
| 318 | return (((long) MSYMBOL_INFO (msym) & 0x80000000) != 0); |
| 319 | } |
| 320 | |
| 321 | /* XFER a value from the big/little/left end of the register. |
| 322 | Depending on the size of the value it might occupy the entire |
| 323 | register or just part of it. Make an allowance for this, aligning |
| 324 | things accordingly. */ |
| 325 | |
| 326 | static void |
| 327 | mips_xfer_register (struct regcache *regcache, int reg_num, int length, |
| 328 | enum bfd_endian endian, bfd_byte * in, |
| 329 | const bfd_byte * out, int buf_offset) |
| 330 | { |
| 331 | int reg_offset = 0; |
| 332 | gdb_assert (reg_num >= NUM_REGS); |
| 333 | /* Need to transfer the left or right part of the register, based on |
| 334 | the targets byte order. */ |
| 335 | switch (endian) |
| 336 | { |
| 337 | case BFD_ENDIAN_BIG: |
| 338 | reg_offset = register_size (current_gdbarch, reg_num) - length; |
| 339 | break; |
| 340 | case BFD_ENDIAN_LITTLE: |
| 341 | reg_offset = 0; |
| 342 | break; |
| 343 | case BFD_ENDIAN_UNKNOWN: /* Indicates no alignment. */ |
| 344 | reg_offset = 0; |
| 345 | break; |
| 346 | default: |
| 347 | internal_error (__FILE__, __LINE__, "bad switch"); |
| 348 | } |
| 349 | if (mips_debug) |
| 350 | fprintf_unfiltered (gdb_stderr, |
| 351 | "xfer $%d, reg offset %d, buf offset %d, length %d, ", |
| 352 | reg_num, reg_offset, buf_offset, length); |
| 353 | if (mips_debug && out != NULL) |
| 354 | { |
| 355 | int i; |
| 356 | fprintf_unfiltered (gdb_stdlog, "out "); |
| 357 | for (i = 0; i < length; i++) |
| 358 | fprintf_unfiltered (gdb_stdlog, "%02x", out[buf_offset + i]); |
| 359 | } |
| 360 | if (in != NULL) |
| 361 | regcache_cooked_read_part (regcache, reg_num, reg_offset, length, |
| 362 | in + buf_offset); |
| 363 | if (out != NULL) |
| 364 | regcache_cooked_write_part (regcache, reg_num, reg_offset, length, |
| 365 | out + buf_offset); |
| 366 | if (mips_debug && in != NULL) |
| 367 | { |
| 368 | int i; |
| 369 | fprintf_unfiltered (gdb_stdlog, "in "); |
| 370 | for (i = 0; i < length; i++) |
| 371 | fprintf_unfiltered (gdb_stdlog, "%02x", in[buf_offset + i]); |
| 372 | } |
| 373 | if (mips_debug) |
| 374 | fprintf_unfiltered (gdb_stdlog, "\n"); |
| 375 | } |
| 376 | |
| 377 | /* Determine if a MIPS3 or later cpu is operating in MIPS{1,2} FPU |
| 378 | compatiblity mode. A return value of 1 means that we have |
| 379 | physical 64-bit registers, but should treat them as 32-bit registers. */ |
| 380 | |
| 381 | static int |
| 382 | mips2_fp_compat (void) |
| 383 | { |
| 384 | /* MIPS1 and MIPS2 have only 32 bit FPRs, and the FR bit is not |
| 385 | meaningful. */ |
| 386 | if (register_size (current_gdbarch, mips_regnum (current_gdbarch)->fp0) == |
| 387 | 4) |
| 388 | return 0; |
| 389 | |
| 390 | #if 0 |
| 391 | /* FIXME drow 2002-03-10: This is disabled until we can do it consistently, |
| 392 | in all the places we deal with FP registers. PR gdb/413. */ |
| 393 | /* Otherwise check the FR bit in the status register - it controls |
| 394 | the FP compatiblity mode. If it is clear we are in compatibility |
| 395 | mode. */ |
| 396 | if ((read_register (PS_REGNUM) & ST0_FR) == 0) |
| 397 | return 1; |
| 398 | #endif |
| 399 | |
| 400 | return 0; |
| 401 | } |
| 402 | |
| 403 | /* The amount of space reserved on the stack for registers. This is |
| 404 | different to MIPS_ABI_REGSIZE as it determines the alignment of |
| 405 | data allocated after the registers have run out. */ |
| 406 | |
| 407 | static const char *mips_stack_argsize_string = size_auto; |
| 408 | |
| 409 | static unsigned int |
| 410 | mips_stack_argsize (struct gdbarch *gdbarch) |
| 411 | { |
| 412 | if (mips_stack_argsize_string == size_auto) |
| 413 | return mips_abi_regsize (gdbarch); |
| 414 | else if (mips_stack_argsize_string == size_64) |
| 415 | return 8; |
| 416 | else /* if (mips_stack_argsize_string == size_32) */ |
| 417 | return 4; |
| 418 | } |
| 419 | |
| 420 | #define VM_MIN_ADDRESS (CORE_ADDR)0x400000 |
| 421 | |
| 422 | struct mips_frame_cache; |
| 423 | static mips_extra_func_info_t heuristic_proc_desc (CORE_ADDR, CORE_ADDR, |
| 424 | struct frame_info *, |
| 425 | struct mips_frame_cache *); |
| 426 | static mips_extra_func_info_t non_heuristic_proc_desc (CORE_ADDR pc, |
| 427 | CORE_ADDR *addrptr); |
| 428 | |
| 429 | static CORE_ADDR heuristic_proc_start (CORE_ADDR); |
| 430 | |
| 431 | static CORE_ADDR read_next_frame_reg (struct frame_info *, int); |
| 432 | |
| 433 | static void reinit_frame_cache_sfunc (char *, int, struct cmd_list_element *); |
| 434 | |
| 435 | static CORE_ADDR after_prologue (CORE_ADDR pc); |
| 436 | |
| 437 | static struct type *mips_float_register_type (void); |
| 438 | static struct type *mips_double_register_type (void); |
| 439 | |
| 440 | /* The list of available "set mips " and "show mips " commands */ |
| 441 | |
| 442 | static struct cmd_list_element *setmipscmdlist = NULL; |
| 443 | static struct cmd_list_element *showmipscmdlist = NULL; |
| 444 | |
| 445 | /* FIXME: brobecker/2004-10-15: I suspect these two declarations can |
| 446 | be removed by a better ordering of the functions below. But I want |
| 447 | to do that as a separate change later in order to separate real |
| 448 | changes and changes that just move some code around. */ |
| 449 | static CORE_ADDR mips32_scan_prologue (CORE_ADDR start_pc, CORE_ADDR limit_pc, |
| 450 | struct frame_info *next_frame, |
| 451 | struct mips_frame_cache *this_cache); |
| 452 | static CORE_ADDR mips16_scan_prologue (CORE_ADDR start_pc, CORE_ADDR limit_pc, |
| 453 | struct frame_info *next_frame, |
| 454 | struct mips_frame_cache *this_cache); |
| 455 | |
| 456 | /* Integer registers 0 thru 31 are handled explicitly by |
| 457 | mips_register_name(). Processor specific registers 32 and above |
| 458 | are listed in the followign tables. */ |
| 459 | |
| 460 | enum |
| 461 | { NUM_MIPS_PROCESSOR_REGS = (90 - 32) }; |
| 462 | |
| 463 | /* Generic MIPS. */ |
| 464 | |
| 465 | static const char *mips_generic_reg_names[NUM_MIPS_PROCESSOR_REGS] = { |
| 466 | "sr", "lo", "hi", "bad", "cause", "pc", |
| 467 | "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", |
| 468 | "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", |
| 469 | "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", |
| 470 | "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", |
| 471 | "fsr", "fir", "" /*"fp" */ , "", |
| 472 | "", "", "", "", "", "", "", "", |
| 473 | "", "", "", "", "", "", "", "", |
| 474 | }; |
| 475 | |
| 476 | /* Names of IDT R3041 registers. */ |
| 477 | |
| 478 | static const char *mips_r3041_reg_names[] = { |
| 479 | "sr", "lo", "hi", "bad", "cause", "pc", |
| 480 | "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", |
| 481 | "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", |
| 482 | "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", |
| 483 | "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", |
| 484 | "fsr", "fir", "", /*"fp" */ "", |
| 485 | "", "", "bus", "ccfg", "", "", "", "", |
| 486 | "", "", "port", "cmp", "", "", "epc", "prid", |
| 487 | }; |
| 488 | |
| 489 | /* Names of tx39 registers. */ |
| 490 | |
| 491 | static const char *mips_tx39_reg_names[NUM_MIPS_PROCESSOR_REGS] = { |
| 492 | "sr", "lo", "hi", "bad", "cause", "pc", |
| 493 | "", "", "", "", "", "", "", "", |
| 494 | "", "", "", "", "", "", "", "", |
| 495 | "", "", "", "", "", "", "", "", |
| 496 | "", "", "", "", "", "", "", "", |
| 497 | "", "", "", "", |
| 498 | "", "", "", "", "", "", "", "", |
| 499 | "", "", "config", "cache", "debug", "depc", "epc", "" |
| 500 | }; |
| 501 | |
| 502 | /* Names of IRIX registers. */ |
| 503 | static const char *mips_irix_reg_names[NUM_MIPS_PROCESSOR_REGS] = { |
| 504 | "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", |
| 505 | "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", |
| 506 | "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", |
| 507 | "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", |
| 508 | "pc", "cause", "bad", "hi", "lo", "fsr", "fir" |
| 509 | }; |
| 510 | |
| 511 | |
| 512 | /* Return the name of the register corresponding to REGNO. */ |
| 513 | static const char * |
| 514 | mips_register_name (int regno) |
| 515 | { |
| 516 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 517 | /* GPR names for all ABIs other than n32/n64. */ |
| 518 | static char *mips_gpr_names[] = { |
| 519 | "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3", |
| 520 | "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", |
| 521 | "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", |
| 522 | "t8", "t9", "k0", "k1", "gp", "sp", "s8", "ra", |
| 523 | }; |
| 524 | |
| 525 | /* GPR names for n32 and n64 ABIs. */ |
| 526 | static char *mips_n32_n64_gpr_names[] = { |
| 527 | "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3", |
| 528 | "a4", "a5", "a6", "a7", "t0", "t1", "t2", "t3", |
| 529 | "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", |
| 530 | "t8", "t9", "k0", "k1", "gp", "sp", "s8", "ra" |
| 531 | }; |
| 532 | |
| 533 | enum mips_abi abi = mips_abi (current_gdbarch); |
| 534 | |
| 535 | /* Map [NUM_REGS .. 2*NUM_REGS) onto the raw registers, but then |
| 536 | don't make the raw register names visible. */ |
| 537 | int rawnum = regno % NUM_REGS; |
| 538 | if (regno < NUM_REGS) |
| 539 | return ""; |
| 540 | |
| 541 | /* The MIPS integer registers are always mapped from 0 to 31. The |
| 542 | names of the registers (which reflects the conventions regarding |
| 543 | register use) vary depending on the ABI. */ |
| 544 | if (0 <= rawnum && rawnum < 32) |
| 545 | { |
| 546 | if (abi == MIPS_ABI_N32 || abi == MIPS_ABI_N64) |
| 547 | return mips_n32_n64_gpr_names[rawnum]; |
| 548 | else |
| 549 | return mips_gpr_names[rawnum]; |
| 550 | } |
| 551 | else if (32 <= rawnum && rawnum < NUM_REGS) |
| 552 | { |
| 553 | gdb_assert (rawnum - 32 < NUM_MIPS_PROCESSOR_REGS); |
| 554 | return tdep->mips_processor_reg_names[rawnum - 32]; |
| 555 | } |
| 556 | else |
| 557 | internal_error (__FILE__, __LINE__, |
| 558 | "mips_register_name: bad register number %d", rawnum); |
| 559 | } |
| 560 | |
| 561 | /* Return the groups that a MIPS register can be categorised into. */ |
| 562 | |
| 563 | static int |
| 564 | mips_register_reggroup_p (struct gdbarch *gdbarch, int regnum, |
| 565 | struct reggroup *reggroup) |
| 566 | { |
| 567 | int vector_p; |
| 568 | int float_p; |
| 569 | int raw_p; |
| 570 | int rawnum = regnum % NUM_REGS; |
| 571 | int pseudo = regnum / NUM_REGS; |
| 572 | if (reggroup == all_reggroup) |
| 573 | return pseudo; |
| 574 | vector_p = TYPE_VECTOR (register_type (gdbarch, regnum)); |
| 575 | float_p = TYPE_CODE (register_type (gdbarch, regnum)) == TYPE_CODE_FLT; |
| 576 | /* FIXME: cagney/2003-04-13: Can't yet use gdbarch_num_regs |
| 577 | (gdbarch), as not all architectures are multi-arch. */ |
| 578 | raw_p = rawnum < NUM_REGS; |
| 579 | if (REGISTER_NAME (regnum) == NULL || REGISTER_NAME (regnum)[0] == '\0') |
| 580 | return 0; |
| 581 | if (reggroup == float_reggroup) |
| 582 | return float_p && pseudo; |
| 583 | if (reggroup == vector_reggroup) |
| 584 | return vector_p && pseudo; |
| 585 | if (reggroup == general_reggroup) |
| 586 | return (!vector_p && !float_p) && pseudo; |
| 587 | /* Save the pseudo registers. Need to make certain that any code |
| 588 | extracting register values from a saved register cache also uses |
| 589 | pseudo registers. */ |
| 590 | if (reggroup == save_reggroup) |
| 591 | return raw_p && pseudo; |
| 592 | /* Restore the same pseudo register. */ |
| 593 | if (reggroup == restore_reggroup) |
| 594 | return raw_p && pseudo; |
| 595 | return 0; |
| 596 | } |
| 597 | |
| 598 | /* Map the symbol table registers which live in the range [1 * |
| 599 | NUM_REGS .. 2 * NUM_REGS) back onto the corresponding raw |
| 600 | registers. Take care of alignment and size problems. */ |
| 601 | |
| 602 | static void |
| 603 | mips_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache, |
| 604 | int cookednum, void *buf) |
| 605 | { |
| 606 | int rawnum = cookednum % NUM_REGS; |
| 607 | gdb_assert (cookednum >= NUM_REGS && cookednum < 2 * NUM_REGS); |
| 608 | if (register_size (gdbarch, rawnum) == register_size (gdbarch, cookednum)) |
| 609 | regcache_raw_read (regcache, rawnum, buf); |
| 610 | else if (register_size (gdbarch, rawnum) > |
| 611 | register_size (gdbarch, cookednum)) |
| 612 | { |
| 613 | if (gdbarch_tdep (gdbarch)->mips64_transfers_32bit_regs_p |
| 614 | || TARGET_BYTE_ORDER == BFD_ENDIAN_LITTLE) |
| 615 | regcache_raw_read_part (regcache, rawnum, 0, 4, buf); |
| 616 | else |
| 617 | regcache_raw_read_part (regcache, rawnum, 4, 4, buf); |
| 618 | } |
| 619 | else |
| 620 | internal_error (__FILE__, __LINE__, "bad register size"); |
| 621 | } |
| 622 | |
| 623 | static void |
| 624 | mips_pseudo_register_write (struct gdbarch *gdbarch, |
| 625 | struct regcache *regcache, int cookednum, |
| 626 | const void *buf) |
| 627 | { |
| 628 | int rawnum = cookednum % NUM_REGS; |
| 629 | gdb_assert (cookednum >= NUM_REGS && cookednum < 2 * NUM_REGS); |
| 630 | if (register_size (gdbarch, rawnum) == register_size (gdbarch, cookednum)) |
| 631 | regcache_raw_write (regcache, rawnum, buf); |
| 632 | else if (register_size (gdbarch, rawnum) > |
| 633 | register_size (gdbarch, cookednum)) |
| 634 | { |
| 635 | if (gdbarch_tdep (gdbarch)->mips64_transfers_32bit_regs_p |
| 636 | || TARGET_BYTE_ORDER == BFD_ENDIAN_LITTLE) |
| 637 | regcache_raw_write_part (regcache, rawnum, 0, 4, buf); |
| 638 | else |
| 639 | regcache_raw_write_part (regcache, rawnum, 4, 4, buf); |
| 640 | } |
| 641 | else |
| 642 | internal_error (__FILE__, __LINE__, "bad register size"); |
| 643 | } |
| 644 | |
| 645 | /* Table to translate MIPS16 register field to actual register number. */ |
| 646 | static int mips16_to_32_reg[8] = { 16, 17, 2, 3, 4, 5, 6, 7 }; |
| 647 | |
| 648 | /* Heuristic_proc_start may hunt through the text section for a long |
| 649 | time across a 2400 baud serial line. Allows the user to limit this |
| 650 | search. */ |
| 651 | |
| 652 | static unsigned int heuristic_fence_post = 0; |
| 653 | |
| 654 | #define PROC_LOW_ADDR(proc) ((proc)->pdr.adr) /* least address */ |
| 655 | #define PROC_HIGH_ADDR(proc) ((proc)->high_addr) /* upper address bound */ |
| 656 | #define PROC_FRAME_OFFSET(proc) ((proc)->pdr.frameoffset) |
| 657 | #define PROC_FRAME_REG(proc) ((proc)->pdr.framereg) |
| 658 | #define PROC_FRAME_ADJUST(proc) ((proc)->frame_adjust) |
| 659 | #define PROC_REG_MASK(proc) ((proc)->pdr.regmask) |
| 660 | #define PROC_FREG_MASK(proc) ((proc)->pdr.fregmask) |
| 661 | #define PROC_REG_OFFSET(proc) ((proc)->pdr.regoffset) |
| 662 | #define PROC_FREG_OFFSET(proc) ((proc)->pdr.fregoffset) |
| 663 | #define PROC_PC_REG(proc) ((proc)->pdr.pcreg) |
| 664 | /* FIXME drow/2002-06-10: If a pointer on the host is bigger than a long, |
| 665 | this will corrupt pdr.iline. Fortunately we don't use it. */ |
| 666 | #define PROC_SYMBOL(proc) (*(struct symbol**)&(proc)->pdr.isym) |
| 667 | #define _PROC_MAGIC_ 0x0F0F0F0F |
| 668 | |
| 669 | /* Number of bytes of storage in the actual machine representation for |
| 670 | register N. NOTE: This defines the pseudo register type so need to |
| 671 | rebuild the architecture vector. */ |
| 672 | |
| 673 | static int mips64_transfers_32bit_regs_p = 0; |
| 674 | |
| 675 | static void |
| 676 | set_mips64_transfers_32bit_regs (char *args, int from_tty, |
| 677 | struct cmd_list_element *c) |
| 678 | { |
| 679 | struct gdbarch_info info; |
| 680 | gdbarch_info_init (&info); |
| 681 | /* FIXME: cagney/2003-11-15: Should be setting a field in "info" |
| 682 | instead of relying on globals. Doing that would let generic code |
| 683 | handle the search for this specific architecture. */ |
| 684 | if (!gdbarch_update_p (info)) |
| 685 | { |
| 686 | mips64_transfers_32bit_regs_p = 0; |
| 687 | error ("32-bit compatibility mode not supported"); |
| 688 | } |
| 689 | } |
| 690 | |
| 691 | /* Convert to/from a register and the corresponding memory value. */ |
| 692 | |
| 693 | static int |
| 694 | mips_convert_register_p (int regnum, struct type *type) |
| 695 | { |
| 696 | return (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG |
| 697 | && register_size (current_gdbarch, regnum) == 4 |
| 698 | && (regnum % NUM_REGS) >= mips_regnum (current_gdbarch)->fp0 |
| 699 | && (regnum % NUM_REGS) < mips_regnum (current_gdbarch)->fp0 + 32 |
| 700 | && TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) == 8); |
| 701 | } |
| 702 | |
| 703 | static void |
| 704 | mips_register_to_value (struct frame_info *frame, int regnum, |
| 705 | struct type *type, void *to) |
| 706 | { |
| 707 | get_frame_register (frame, regnum + 0, (char *) to + 4); |
| 708 | get_frame_register (frame, regnum + 1, (char *) to + 0); |
| 709 | } |
| 710 | |
| 711 | static void |
| 712 | mips_value_to_register (struct frame_info *frame, int regnum, |
| 713 | struct type *type, const void *from) |
| 714 | { |
| 715 | put_frame_register (frame, regnum + 0, (const char *) from + 4); |
| 716 | put_frame_register (frame, regnum + 1, (const char *) from + 0); |
| 717 | } |
| 718 | |
| 719 | /* Return the GDB type object for the "standard" data type of data in |
| 720 | register REG. */ |
| 721 | |
| 722 | static struct type * |
| 723 | mips_register_type (struct gdbarch *gdbarch, int regnum) |
| 724 | { |
| 725 | gdb_assert (regnum >= 0 && regnum < 2 * NUM_REGS); |
| 726 | if ((regnum % NUM_REGS) >= mips_regnum (current_gdbarch)->fp0 |
| 727 | && (regnum % NUM_REGS) < mips_regnum (current_gdbarch)->fp0 + 32) |
| 728 | { |
| 729 | /* The floating-point registers raw, or cooked, always match |
| 730 | mips_isa_regsize(), and also map 1:1, byte for byte. */ |
| 731 | switch (gdbarch_byte_order (gdbarch)) |
| 732 | { |
| 733 | case BFD_ENDIAN_BIG: |
| 734 | if (mips_isa_regsize (gdbarch) == 4) |
| 735 | return builtin_type_ieee_single_big; |
| 736 | else |
| 737 | return builtin_type_ieee_double_big; |
| 738 | case BFD_ENDIAN_LITTLE: |
| 739 | if (mips_isa_regsize (gdbarch) == 4) |
| 740 | return builtin_type_ieee_single_little; |
| 741 | else |
| 742 | return builtin_type_ieee_double_little; |
| 743 | case BFD_ENDIAN_UNKNOWN: |
| 744 | default: |
| 745 | internal_error (__FILE__, __LINE__, "bad switch"); |
| 746 | } |
| 747 | } |
| 748 | else if (regnum < NUM_REGS) |
| 749 | { |
| 750 | /* The raw or ISA registers. These are all sized according to |
| 751 | the ISA regsize. */ |
| 752 | if (mips_isa_regsize (gdbarch) == 4) |
| 753 | return builtin_type_int32; |
| 754 | else |
| 755 | return builtin_type_int64; |
| 756 | } |
| 757 | else |
| 758 | { |
| 759 | /* The cooked or ABI registers. These are sized according to |
| 760 | the ABI (with a few complications). */ |
| 761 | if (regnum >= (NUM_REGS |
| 762 | + mips_regnum (current_gdbarch)->fp_control_status) |
| 763 | && regnum <= NUM_REGS + LAST_EMBED_REGNUM) |
| 764 | /* The pseudo/cooked view of the embedded registers is always |
| 765 | 32-bit. The raw view is handled below. */ |
| 766 | return builtin_type_int32; |
| 767 | else if (gdbarch_tdep (gdbarch)->mips64_transfers_32bit_regs_p) |
| 768 | /* The target, while possibly using a 64-bit register buffer, |
| 769 | is only transfering 32-bits of each integer register. |
| 770 | Reflect this in the cooked/pseudo (ABI) register value. */ |
| 771 | return builtin_type_int32; |
| 772 | else if (mips_abi_regsize (gdbarch) == 4) |
| 773 | /* The ABI is restricted to 32-bit registers (the ISA could be |
| 774 | 32- or 64-bit). */ |
| 775 | return builtin_type_int32; |
| 776 | else |
| 777 | /* 64-bit ABI. */ |
| 778 | return builtin_type_int64; |
| 779 | } |
| 780 | } |
| 781 | |
| 782 | /* TARGET_READ_SP -- Remove useless bits from the stack pointer. */ |
| 783 | |
| 784 | static CORE_ADDR |
| 785 | mips_read_sp (void) |
| 786 | { |
| 787 | return read_signed_register (MIPS_SP_REGNUM); |
| 788 | } |
| 789 | |
| 790 | /* Should the upper word of 64-bit addresses be zeroed? */ |
| 791 | enum auto_boolean mask_address_var = AUTO_BOOLEAN_AUTO; |
| 792 | |
| 793 | static int |
| 794 | mips_mask_address_p (struct gdbarch_tdep *tdep) |
| 795 | { |
| 796 | switch (mask_address_var) |
| 797 | { |
| 798 | case AUTO_BOOLEAN_TRUE: |
| 799 | return 1; |
| 800 | case AUTO_BOOLEAN_FALSE: |
| 801 | return 0; |
| 802 | break; |
| 803 | case AUTO_BOOLEAN_AUTO: |
| 804 | return tdep->default_mask_address_p; |
| 805 | default: |
| 806 | internal_error (__FILE__, __LINE__, "mips_mask_address_p: bad switch"); |
| 807 | return -1; |
| 808 | } |
| 809 | } |
| 810 | |
| 811 | static void |
| 812 | show_mask_address (char *cmd, int from_tty, struct cmd_list_element *c) |
| 813 | { |
| 814 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 815 | switch (mask_address_var) |
| 816 | { |
| 817 | case AUTO_BOOLEAN_TRUE: |
| 818 | printf_filtered ("The 32 bit mips address mask is enabled\n"); |
| 819 | break; |
| 820 | case AUTO_BOOLEAN_FALSE: |
| 821 | printf_filtered ("The 32 bit mips address mask is disabled\n"); |
| 822 | break; |
| 823 | case AUTO_BOOLEAN_AUTO: |
| 824 | printf_filtered |
| 825 | ("The 32 bit address mask is set automatically. Currently %s\n", |
| 826 | mips_mask_address_p (tdep) ? "enabled" : "disabled"); |
| 827 | break; |
| 828 | default: |
| 829 | internal_error (__FILE__, __LINE__, "show_mask_address: bad switch"); |
| 830 | break; |
| 831 | } |
| 832 | } |
| 833 | |
| 834 | /* Tell if the program counter value in MEMADDR is in a MIPS16 function. */ |
| 835 | |
| 836 | static int |
| 837 | pc_is_mips16 (bfd_vma memaddr) |
| 838 | { |
| 839 | struct minimal_symbol *sym; |
| 840 | |
| 841 | /* If bit 0 of the address is set, assume this is a MIPS16 address. */ |
| 842 | if (is_mips16_addr (memaddr)) |
| 843 | return 1; |
| 844 | |
| 845 | /* A flag indicating that this is a MIPS16 function is stored by elfread.c in |
| 846 | the high bit of the info field. Use this to decide if the function is |
| 847 | MIPS16 or normal MIPS. */ |
| 848 | sym = lookup_minimal_symbol_by_pc (memaddr); |
| 849 | if (sym) |
| 850 | return msymbol_is_special (sym); |
| 851 | else |
| 852 | return 0; |
| 853 | } |
| 854 | |
| 855 | /* MIPS believes that the PC has a sign extended value. Perhaps the |
| 856 | all registers should be sign extended for simplicity? */ |
| 857 | |
| 858 | static CORE_ADDR |
| 859 | mips_read_pc (ptid_t ptid) |
| 860 | { |
| 861 | return read_signed_register_pid (mips_regnum (current_gdbarch)->pc, ptid); |
| 862 | } |
| 863 | |
| 864 | static CORE_ADDR |
| 865 | mips_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 866 | { |
| 867 | return frame_unwind_register_signed (next_frame, |
| 868 | NUM_REGS + mips_regnum (gdbarch)->pc); |
| 869 | } |
| 870 | |
| 871 | /* Assuming NEXT_FRAME->prev is a dummy, return the frame ID of that |
| 872 | dummy frame. The frame ID's base needs to match the TOS value |
| 873 | saved by save_dummy_frame_tos(), and the PC match the dummy frame's |
| 874 | breakpoint. */ |
| 875 | |
| 876 | static struct frame_id |
| 877 | mips_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 878 | { |
| 879 | return frame_id_build (frame_unwind_register_signed (next_frame, NUM_REGS + MIPS_SP_REGNUM), |
| 880 | frame_pc_unwind (next_frame)); |
| 881 | } |
| 882 | |
| 883 | static void |
| 884 | mips_write_pc (CORE_ADDR pc, ptid_t ptid) |
| 885 | { |
| 886 | write_register_pid (mips_regnum (current_gdbarch)->pc, pc, ptid); |
| 887 | } |
| 888 | |
| 889 | /* This returns the PC of the first inst after the prologue. If we can't |
| 890 | find the prologue, then return 0. */ |
| 891 | |
| 892 | static CORE_ADDR |
| 893 | after_prologue (CORE_ADDR pc) |
| 894 | { |
| 895 | mips_extra_func_info_t proc_desc; |
| 896 | struct symtab_and_line sal; |
| 897 | CORE_ADDR func_addr, func_end; |
| 898 | CORE_ADDR startaddr = 0; |
| 899 | |
| 900 | /* Pass a NULL next_frame to heuristic_proc_desc. We should not |
| 901 | attempt to read the stack pointer from the current machine state, |
| 902 | because the current machine state has nothing to do with the |
| 903 | information we need from the proc_desc; and the process may or |
| 904 | may not exist right now. */ |
| 905 | proc_desc = non_heuristic_proc_desc (pc, &startaddr); |
| 906 | if (proc_desc) |
| 907 | { |
| 908 | /* IF this is the topmost frame AND (this proc does not have |
| 909 | debugging information OR the PC is in the procedure prologue) |
| 910 | THEN create a "heuristic" proc_desc (by analyzing the actual |
| 911 | code) to replace the "official" proc_desc. */ |
| 912 | struct symtab_and_line val; |
| 913 | if (PROC_SYMBOL (proc_desc)) |
| 914 | { |
| 915 | val = find_pc_line (BLOCK_START |
| 916 | (SYMBOL_BLOCK_VALUE (PROC_SYMBOL (proc_desc))), |
| 917 | 0); |
| 918 | val.pc = val.end ? val.end : pc; |
| 919 | } |
| 920 | if (!PROC_SYMBOL (proc_desc) || pc < val.pc) |
| 921 | { |
| 922 | mips_extra_func_info_t found_heuristic = |
| 923 | heuristic_proc_desc (PROC_LOW_ADDR (proc_desc), pc, NULL, NULL); |
| 924 | if (found_heuristic) |
| 925 | proc_desc = found_heuristic; |
| 926 | } |
| 927 | } |
| 928 | else |
| 929 | { |
| 930 | if (startaddr == 0) |
| 931 | startaddr = heuristic_proc_start (pc); |
| 932 | |
| 933 | proc_desc = heuristic_proc_desc (startaddr, pc, NULL, NULL); |
| 934 | } |
| 935 | |
| 936 | if (proc_desc) |
| 937 | { |
| 938 | /* If function is frameless, then we need to do it the hard way. I |
| 939 | strongly suspect that frameless always means prologueless... */ |
| 940 | if (PROC_FRAME_REG (proc_desc) == MIPS_SP_REGNUM |
| 941 | && PROC_FRAME_OFFSET (proc_desc) == 0) |
| 942 | return 0; |
| 943 | } |
| 944 | |
| 945 | if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end)) |
| 946 | return 0; /* Unknown */ |
| 947 | |
| 948 | sal = find_pc_line (func_addr, 0); |
| 949 | |
| 950 | if (sal.end < func_end) |
| 951 | return sal.end; |
| 952 | |
| 953 | /* The line after the prologue is after the end of the function. In this |
| 954 | case, tell the caller to find the prologue the hard way. */ |
| 955 | |
| 956 | return 0; |
| 957 | } |
| 958 | |
| 959 | /* Fetch and return instruction from the specified location. If the PC |
| 960 | is odd, assume it's a MIPS16 instruction; otherwise MIPS32. */ |
| 961 | |
| 962 | static t_inst |
| 963 | mips_fetch_instruction (CORE_ADDR addr) |
| 964 | { |
| 965 | char buf[MIPS_INSTLEN]; |
| 966 | int instlen; |
| 967 | int status; |
| 968 | |
| 969 | if (pc_is_mips16 (addr)) |
| 970 | { |
| 971 | instlen = MIPS16_INSTLEN; |
| 972 | addr = unmake_mips16_addr (addr); |
| 973 | } |
| 974 | else |
| 975 | instlen = MIPS_INSTLEN; |
| 976 | status = deprecated_read_memory_nobpt (addr, buf, instlen); |
| 977 | if (status) |
| 978 | memory_error (status, addr); |
| 979 | return extract_unsigned_integer (buf, instlen); |
| 980 | } |
| 981 | |
| 982 | static ULONGEST |
| 983 | mips16_fetch_instruction (CORE_ADDR addr) |
| 984 | { |
| 985 | char buf[MIPS_INSTLEN]; |
| 986 | int instlen; |
| 987 | int status; |
| 988 | |
| 989 | instlen = MIPS16_INSTLEN; |
| 990 | addr = unmake_mips16_addr (addr); |
| 991 | status = deprecated_read_memory_nobpt (addr, buf, instlen); |
| 992 | if (status) |
| 993 | memory_error (status, addr); |
| 994 | return extract_unsigned_integer (buf, instlen); |
| 995 | } |
| 996 | |
| 997 | /* These the fields of 32 bit mips instructions */ |
| 998 | #define mips32_op(x) (x >> 26) |
| 999 | #define itype_op(x) (x >> 26) |
| 1000 | #define itype_rs(x) ((x >> 21) & 0x1f) |
| 1001 | #define itype_rt(x) ((x >> 16) & 0x1f) |
| 1002 | #define itype_immediate(x) (x & 0xffff) |
| 1003 | |
| 1004 | #define jtype_op(x) (x >> 26) |
| 1005 | #define jtype_target(x) (x & 0x03ffffff) |
| 1006 | |
| 1007 | #define rtype_op(x) (x >> 26) |
| 1008 | #define rtype_rs(x) ((x >> 21) & 0x1f) |
| 1009 | #define rtype_rt(x) ((x >> 16) & 0x1f) |
| 1010 | #define rtype_rd(x) ((x >> 11) & 0x1f) |
| 1011 | #define rtype_shamt(x) ((x >> 6) & 0x1f) |
| 1012 | #define rtype_funct(x) (x & 0x3f) |
| 1013 | |
| 1014 | static CORE_ADDR |
| 1015 | mips32_relative_offset (unsigned long inst) |
| 1016 | { |
| 1017 | long x; |
| 1018 | x = itype_immediate (inst); |
| 1019 | if (x & 0x8000) /* sign bit set */ |
| 1020 | { |
| 1021 | x |= 0xffff0000; /* sign extension */ |
| 1022 | } |
| 1023 | x = x << 2; |
| 1024 | return x; |
| 1025 | } |
| 1026 | |
| 1027 | /* Determine whate to set a single step breakpoint while considering |
| 1028 | branch prediction */ |
| 1029 | static CORE_ADDR |
| 1030 | mips32_next_pc (CORE_ADDR pc) |
| 1031 | { |
| 1032 | unsigned long inst; |
| 1033 | int op; |
| 1034 | inst = mips_fetch_instruction (pc); |
| 1035 | if ((inst & 0xe0000000) != 0) /* Not a special, jump or branch instruction */ |
| 1036 | { |
| 1037 | if (itype_op (inst) >> 2 == 5) |
| 1038 | /* BEQL, BNEL, BLEZL, BGTZL: bits 0101xx */ |
| 1039 | { |
| 1040 | op = (itype_op (inst) & 0x03); |
| 1041 | switch (op) |
| 1042 | { |
| 1043 | case 0: /* BEQL */ |
| 1044 | goto equal_branch; |
| 1045 | case 1: /* BNEL */ |
| 1046 | goto neq_branch; |
| 1047 | case 2: /* BLEZL */ |
| 1048 | goto less_branch; |
| 1049 | case 3: /* BGTZ */ |
| 1050 | goto greater_branch; |
| 1051 | default: |
| 1052 | pc += 4; |
| 1053 | } |
| 1054 | } |
| 1055 | else if (itype_op (inst) == 17 && itype_rs (inst) == 8) |
| 1056 | /* BC1F, BC1FL, BC1T, BC1TL: 010001 01000 */ |
| 1057 | { |
| 1058 | int tf = itype_rt (inst) & 0x01; |
| 1059 | int cnum = itype_rt (inst) >> 2; |
| 1060 | int fcrcs = |
| 1061 | read_signed_register (mips_regnum (current_gdbarch)-> |
| 1062 | fp_control_status); |
| 1063 | int cond = ((fcrcs >> 24) & 0x0e) | ((fcrcs >> 23) & 0x01); |
| 1064 | |
| 1065 | if (((cond >> cnum) & 0x01) == tf) |
| 1066 | pc += mips32_relative_offset (inst) + 4; |
| 1067 | else |
| 1068 | pc += 8; |
| 1069 | } |
| 1070 | else |
| 1071 | pc += 4; /* Not a branch, next instruction is easy */ |
| 1072 | } |
| 1073 | else |
| 1074 | { /* This gets way messy */ |
| 1075 | |
| 1076 | /* Further subdivide into SPECIAL, REGIMM and other */ |
| 1077 | switch (op = itype_op (inst) & 0x07) /* extract bits 28,27,26 */ |
| 1078 | { |
| 1079 | case 0: /* SPECIAL */ |
| 1080 | op = rtype_funct (inst); |
| 1081 | switch (op) |
| 1082 | { |
| 1083 | case 8: /* JR */ |
| 1084 | case 9: /* JALR */ |
| 1085 | /* Set PC to that address */ |
| 1086 | pc = read_signed_register (rtype_rs (inst)); |
| 1087 | break; |
| 1088 | default: |
| 1089 | pc += 4; |
| 1090 | } |
| 1091 | |
| 1092 | break; /* end SPECIAL */ |
| 1093 | case 1: /* REGIMM */ |
| 1094 | { |
| 1095 | op = itype_rt (inst); /* branch condition */ |
| 1096 | switch (op) |
| 1097 | { |
| 1098 | case 0: /* BLTZ */ |
| 1099 | case 2: /* BLTZL */ |
| 1100 | case 16: /* BLTZAL */ |
| 1101 | case 18: /* BLTZALL */ |
| 1102 | less_branch: |
| 1103 | if (read_signed_register (itype_rs (inst)) < 0) |
| 1104 | pc += mips32_relative_offset (inst) + 4; |
| 1105 | else |
| 1106 | pc += 8; /* after the delay slot */ |
| 1107 | break; |
| 1108 | case 1: /* BGEZ */ |
| 1109 | case 3: /* BGEZL */ |
| 1110 | case 17: /* BGEZAL */ |
| 1111 | case 19: /* BGEZALL */ |
| 1112 | if (read_signed_register (itype_rs (inst)) >= 0) |
| 1113 | pc += mips32_relative_offset (inst) + 4; |
| 1114 | else |
| 1115 | pc += 8; /* after the delay slot */ |
| 1116 | break; |
| 1117 | /* All of the other instructions in the REGIMM category */ |
| 1118 | default: |
| 1119 | pc += 4; |
| 1120 | } |
| 1121 | } |
| 1122 | break; /* end REGIMM */ |
| 1123 | case 2: /* J */ |
| 1124 | case 3: /* JAL */ |
| 1125 | { |
| 1126 | unsigned long reg; |
| 1127 | reg = jtype_target (inst) << 2; |
| 1128 | /* Upper four bits get never changed... */ |
| 1129 | pc = reg + ((pc + 4) & 0xf0000000); |
| 1130 | } |
| 1131 | break; |
| 1132 | /* FIXME case JALX : */ |
| 1133 | { |
| 1134 | unsigned long reg; |
| 1135 | reg = jtype_target (inst) << 2; |
| 1136 | pc = reg + ((pc + 4) & 0xf0000000) + 1; /* yes, +1 */ |
| 1137 | /* Add 1 to indicate 16 bit mode - Invert ISA mode */ |
| 1138 | } |
| 1139 | break; /* The new PC will be alternate mode */ |
| 1140 | case 4: /* BEQ, BEQL */ |
| 1141 | equal_branch: |
| 1142 | if (read_signed_register (itype_rs (inst)) == |
| 1143 | read_signed_register (itype_rt (inst))) |
| 1144 | pc += mips32_relative_offset (inst) + 4; |
| 1145 | else |
| 1146 | pc += 8; |
| 1147 | break; |
| 1148 | case 5: /* BNE, BNEL */ |
| 1149 | neq_branch: |
| 1150 | if (read_signed_register (itype_rs (inst)) != |
| 1151 | read_signed_register (itype_rt (inst))) |
| 1152 | pc += mips32_relative_offset (inst) + 4; |
| 1153 | else |
| 1154 | pc += 8; |
| 1155 | break; |
| 1156 | case 6: /* BLEZ, BLEZL */ |
| 1157 | if (read_signed_register (itype_rs (inst)) <= 0) |
| 1158 | pc += mips32_relative_offset (inst) + 4; |
| 1159 | else |
| 1160 | pc += 8; |
| 1161 | break; |
| 1162 | case 7: |
| 1163 | default: |
| 1164 | greater_branch: /* BGTZ, BGTZL */ |
| 1165 | if (read_signed_register (itype_rs (inst)) > 0) |
| 1166 | pc += mips32_relative_offset (inst) + 4; |
| 1167 | else |
| 1168 | pc += 8; |
| 1169 | break; |
| 1170 | } /* switch */ |
| 1171 | } /* else */ |
| 1172 | return pc; |
| 1173 | } /* mips32_next_pc */ |
| 1174 | |
| 1175 | /* Decoding the next place to set a breakpoint is irregular for the |
| 1176 | mips 16 variant, but fortunately, there fewer instructions. We have to cope |
| 1177 | ith extensions for 16 bit instructions and a pair of actual 32 bit instructions. |
| 1178 | We dont want to set a single step instruction on the extend instruction |
| 1179 | either. |
| 1180 | */ |
| 1181 | |
| 1182 | /* Lots of mips16 instruction formats */ |
| 1183 | /* Predicting jumps requires itype,ritype,i8type |
| 1184 | and their extensions extItype,extritype,extI8type |
| 1185 | */ |
| 1186 | enum mips16_inst_fmts |
| 1187 | { |
| 1188 | itype, /* 0 immediate 5,10 */ |
| 1189 | ritype, /* 1 5,3,8 */ |
| 1190 | rrtype, /* 2 5,3,3,5 */ |
| 1191 | rritype, /* 3 5,3,3,5 */ |
| 1192 | rrrtype, /* 4 5,3,3,3,2 */ |
| 1193 | rriatype, /* 5 5,3,3,1,4 */ |
| 1194 | shifttype, /* 6 5,3,3,3,2 */ |
| 1195 | i8type, /* 7 5,3,8 */ |
| 1196 | i8movtype, /* 8 5,3,3,5 */ |
| 1197 | i8mov32rtype, /* 9 5,3,5,3 */ |
| 1198 | i64type, /* 10 5,3,8 */ |
| 1199 | ri64type, /* 11 5,3,3,5 */ |
| 1200 | jalxtype, /* 12 5,1,5,5,16 - a 32 bit instruction */ |
| 1201 | exiItype, /* 13 5,6,5,5,1,1,1,1,1,1,5 */ |
| 1202 | extRitype, /* 14 5,6,5,5,3,1,1,1,5 */ |
| 1203 | extRRItype, /* 15 5,5,5,5,3,3,5 */ |
| 1204 | extRRIAtype, /* 16 5,7,4,5,3,3,1,4 */ |
| 1205 | EXTshifttype, /* 17 5,5,1,1,1,1,1,1,5,3,3,1,1,1,2 */ |
| 1206 | extI8type, /* 18 5,6,5,5,3,1,1,1,5 */ |
| 1207 | extI64type, /* 19 5,6,5,5,3,1,1,1,5 */ |
| 1208 | extRi64type, /* 20 5,6,5,5,3,3,5 */ |
| 1209 | extshift64type /* 21 5,5,1,1,1,1,1,1,5,1,1,1,3,5 */ |
| 1210 | }; |
| 1211 | /* I am heaping all the fields of the formats into one structure and |
| 1212 | then, only the fields which are involved in instruction extension */ |
| 1213 | struct upk_mips16 |
| 1214 | { |
| 1215 | CORE_ADDR offset; |
| 1216 | unsigned int regx; /* Function in i8 type */ |
| 1217 | unsigned int regy; |
| 1218 | }; |
| 1219 | |
| 1220 | |
| 1221 | /* The EXT-I, EXT-ri nad EXT-I8 instructions all have the same format |
| 1222 | for the bits which make up the immediatate extension. */ |
| 1223 | |
| 1224 | static CORE_ADDR |
| 1225 | extended_offset (unsigned int extension) |
| 1226 | { |
| 1227 | CORE_ADDR value; |
| 1228 | value = (extension >> 21) & 0x3f; /* * extract 15:11 */ |
| 1229 | value = value << 6; |
| 1230 | value |= (extension >> 16) & 0x1f; /* extrace 10:5 */ |
| 1231 | value = value << 5; |
| 1232 | value |= extension & 0x01f; /* extract 4:0 */ |
| 1233 | return value; |
| 1234 | } |
| 1235 | |
| 1236 | /* Only call this function if you know that this is an extendable |
| 1237 | instruction, It wont malfunction, but why make excess remote memory references? |
| 1238 | If the immediate operands get sign extended or somthing, do it after |
| 1239 | the extension is performed. |
| 1240 | */ |
| 1241 | /* FIXME: Every one of these cases needs to worry about sign extension |
| 1242 | when the offset is to be used in relative addressing */ |
| 1243 | |
| 1244 | |
| 1245 | static unsigned int |
| 1246 | fetch_mips_16 (CORE_ADDR pc) |
| 1247 | { |
| 1248 | char buf[8]; |
| 1249 | pc &= 0xfffffffe; /* clear the low order bit */ |
| 1250 | target_read_memory (pc, buf, 2); |
| 1251 | return extract_unsigned_integer (buf, 2); |
| 1252 | } |
| 1253 | |
| 1254 | static void |
| 1255 | unpack_mips16 (CORE_ADDR pc, |
| 1256 | unsigned int extension, |
| 1257 | unsigned int inst, |
| 1258 | enum mips16_inst_fmts insn_format, struct upk_mips16 *upk) |
| 1259 | { |
| 1260 | CORE_ADDR offset; |
| 1261 | int regx; |
| 1262 | int regy; |
| 1263 | switch (insn_format) |
| 1264 | { |
| 1265 | case itype: |
| 1266 | { |
| 1267 | CORE_ADDR value; |
| 1268 | if (extension) |
| 1269 | { |
| 1270 | value = extended_offset (extension); |
| 1271 | value = value << 11; /* rom for the original value */ |
| 1272 | value |= inst & 0x7ff; /* eleven bits from instruction */ |
| 1273 | } |
| 1274 | else |
| 1275 | { |
| 1276 | value = inst & 0x7ff; |
| 1277 | /* FIXME : Consider sign extension */ |
| 1278 | } |
| 1279 | offset = value; |
| 1280 | regx = -1; |
| 1281 | regy = -1; |
| 1282 | } |
| 1283 | break; |
| 1284 | case ritype: |
| 1285 | case i8type: |
| 1286 | { /* A register identifier and an offset */ |
| 1287 | /* Most of the fields are the same as I type but the |
| 1288 | immediate value is of a different length */ |
| 1289 | CORE_ADDR value; |
| 1290 | if (extension) |
| 1291 | { |
| 1292 | value = extended_offset (extension); |
| 1293 | value = value << 8; /* from the original instruction */ |
| 1294 | value |= inst & 0xff; /* eleven bits from instruction */ |
| 1295 | regx = (extension >> 8) & 0x07; /* or i8 funct */ |
| 1296 | if (value & 0x4000) /* test the sign bit , bit 26 */ |
| 1297 | { |
| 1298 | value &= ~0x3fff; /* remove the sign bit */ |
| 1299 | value = -value; |
| 1300 | } |
| 1301 | } |
| 1302 | else |
| 1303 | { |
| 1304 | value = inst & 0xff; /* 8 bits */ |
| 1305 | regx = (inst >> 8) & 0x07; /* or i8 funct */ |
| 1306 | /* FIXME: Do sign extension , this format needs it */ |
| 1307 | if (value & 0x80) /* THIS CONFUSES ME */ |
| 1308 | { |
| 1309 | value &= 0xef; /* remove the sign bit */ |
| 1310 | value = -value; |
| 1311 | } |
| 1312 | } |
| 1313 | offset = value; |
| 1314 | regy = -1; |
| 1315 | break; |
| 1316 | } |
| 1317 | case jalxtype: |
| 1318 | { |
| 1319 | unsigned long value; |
| 1320 | unsigned int nexthalf; |
| 1321 | value = ((inst & 0x1f) << 5) | ((inst >> 5) & 0x1f); |
| 1322 | value = value << 16; |
| 1323 | nexthalf = mips_fetch_instruction (pc + 2); /* low bit still set */ |
| 1324 | value |= nexthalf; |
| 1325 | offset = value; |
| 1326 | regx = -1; |
| 1327 | regy = -1; |
| 1328 | break; |
| 1329 | } |
| 1330 | default: |
| 1331 | internal_error (__FILE__, __LINE__, "bad switch"); |
| 1332 | } |
| 1333 | upk->offset = offset; |
| 1334 | upk->regx = regx; |
| 1335 | upk->regy = regy; |
| 1336 | } |
| 1337 | |
| 1338 | |
| 1339 | static CORE_ADDR |
| 1340 | add_offset_16 (CORE_ADDR pc, int offset) |
| 1341 | { |
| 1342 | return ((offset << 2) | ((pc + 2) & (0xf0000000))); |
| 1343 | } |
| 1344 | |
| 1345 | static CORE_ADDR |
| 1346 | extended_mips16_next_pc (CORE_ADDR pc, |
| 1347 | unsigned int extension, unsigned int insn) |
| 1348 | { |
| 1349 | int op = (insn >> 11); |
| 1350 | switch (op) |
| 1351 | { |
| 1352 | case 2: /* Branch */ |
| 1353 | { |
| 1354 | CORE_ADDR offset; |
| 1355 | struct upk_mips16 upk; |
| 1356 | unpack_mips16 (pc, extension, insn, itype, &upk); |
| 1357 | offset = upk.offset; |
| 1358 | if (offset & 0x800) |
| 1359 | { |
| 1360 | offset &= 0xeff; |
| 1361 | offset = -offset; |
| 1362 | } |
| 1363 | pc += (offset << 1) + 2; |
| 1364 | break; |
| 1365 | } |
| 1366 | case 3: /* JAL , JALX - Watch out, these are 32 bit instruction */ |
| 1367 | { |
| 1368 | struct upk_mips16 upk; |
| 1369 | unpack_mips16 (pc, extension, insn, jalxtype, &upk); |
| 1370 | pc = add_offset_16 (pc, upk.offset); |
| 1371 | if ((insn >> 10) & 0x01) /* Exchange mode */ |
| 1372 | pc = pc & ~0x01; /* Clear low bit, indicate 32 bit mode */ |
| 1373 | else |
| 1374 | pc |= 0x01; |
| 1375 | break; |
| 1376 | } |
| 1377 | case 4: /* beqz */ |
| 1378 | { |
| 1379 | struct upk_mips16 upk; |
| 1380 | int reg; |
| 1381 | unpack_mips16 (pc, extension, insn, ritype, &upk); |
| 1382 | reg = read_signed_register (upk.regx); |
| 1383 | if (reg == 0) |
| 1384 | pc += (upk.offset << 1) + 2; |
| 1385 | else |
| 1386 | pc += 2; |
| 1387 | break; |
| 1388 | } |
| 1389 | case 5: /* bnez */ |
| 1390 | { |
| 1391 | struct upk_mips16 upk; |
| 1392 | int reg; |
| 1393 | unpack_mips16 (pc, extension, insn, ritype, &upk); |
| 1394 | reg = read_signed_register (upk.regx); |
| 1395 | if (reg != 0) |
| 1396 | pc += (upk.offset << 1) + 2; |
| 1397 | else |
| 1398 | pc += 2; |
| 1399 | break; |
| 1400 | } |
| 1401 | case 12: /* I8 Formats btez btnez */ |
| 1402 | { |
| 1403 | struct upk_mips16 upk; |
| 1404 | int reg; |
| 1405 | unpack_mips16 (pc, extension, insn, i8type, &upk); |
| 1406 | /* upk.regx contains the opcode */ |
| 1407 | reg = read_signed_register (24); /* Test register is 24 */ |
| 1408 | if (((upk.regx == 0) && (reg == 0)) /* BTEZ */ |
| 1409 | || ((upk.regx == 1) && (reg != 0))) /* BTNEZ */ |
| 1410 | /* pc = add_offset_16(pc,upk.offset) ; */ |
| 1411 | pc += (upk.offset << 1) + 2; |
| 1412 | else |
| 1413 | pc += 2; |
| 1414 | break; |
| 1415 | } |
| 1416 | case 29: /* RR Formats JR, JALR, JALR-RA */ |
| 1417 | { |
| 1418 | struct upk_mips16 upk; |
| 1419 | /* upk.fmt = rrtype; */ |
| 1420 | op = insn & 0x1f; |
| 1421 | if (op == 0) |
| 1422 | { |
| 1423 | int reg; |
| 1424 | upk.regx = (insn >> 8) & 0x07; |
| 1425 | upk.regy = (insn >> 5) & 0x07; |
| 1426 | switch (upk.regy) |
| 1427 | { |
| 1428 | case 0: |
| 1429 | reg = upk.regx; |
| 1430 | break; |
| 1431 | case 1: |
| 1432 | reg = 31; |
| 1433 | break; /* Function return instruction */ |
| 1434 | case 2: |
| 1435 | reg = upk.regx; |
| 1436 | break; |
| 1437 | default: |
| 1438 | reg = 31; |
| 1439 | break; /* BOGUS Guess */ |
| 1440 | } |
| 1441 | pc = read_signed_register (reg); |
| 1442 | } |
| 1443 | else |
| 1444 | pc += 2; |
| 1445 | break; |
| 1446 | } |
| 1447 | case 30: |
| 1448 | /* This is an instruction extension. Fetch the real instruction |
| 1449 | (which follows the extension) and decode things based on |
| 1450 | that. */ |
| 1451 | { |
| 1452 | pc += 2; |
| 1453 | pc = extended_mips16_next_pc (pc, insn, fetch_mips_16 (pc)); |
| 1454 | break; |
| 1455 | } |
| 1456 | default: |
| 1457 | { |
| 1458 | pc += 2; |
| 1459 | break; |
| 1460 | } |
| 1461 | } |
| 1462 | return pc; |
| 1463 | } |
| 1464 | |
| 1465 | static CORE_ADDR |
| 1466 | mips16_next_pc (CORE_ADDR pc) |
| 1467 | { |
| 1468 | unsigned int insn = fetch_mips_16 (pc); |
| 1469 | return extended_mips16_next_pc (pc, 0, insn); |
| 1470 | } |
| 1471 | |
| 1472 | /* The mips_next_pc function supports single_step when the remote |
| 1473 | target monitor or stub is not developed enough to do a single_step. |
| 1474 | It works by decoding the current instruction and predicting where a |
| 1475 | branch will go. This isnt hard because all the data is available. |
| 1476 | The MIPS32 and MIPS16 variants are quite different */ |
| 1477 | CORE_ADDR |
| 1478 | mips_next_pc (CORE_ADDR pc) |
| 1479 | { |
| 1480 | if (pc & 0x01) |
| 1481 | return mips16_next_pc (pc); |
| 1482 | else |
| 1483 | return mips32_next_pc (pc); |
| 1484 | } |
| 1485 | |
| 1486 | struct mips_frame_cache |
| 1487 | { |
| 1488 | CORE_ADDR base; |
| 1489 | struct trad_frame_saved_reg *saved_regs; |
| 1490 | }; |
| 1491 | |
| 1492 | |
| 1493 | static struct mips_frame_cache * |
| 1494 | mips_mdebug_frame_cache (struct frame_info *next_frame, void **this_cache) |
| 1495 | { |
| 1496 | CORE_ADDR startaddr = 0; |
| 1497 | mips_extra_func_info_t proc_desc; |
| 1498 | struct mips_frame_cache *cache; |
| 1499 | struct gdbarch *gdbarch = get_frame_arch (next_frame); |
| 1500 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1501 | /* r0 bit means kernel trap */ |
| 1502 | int kernel_trap; |
| 1503 | /* What registers have been saved? Bitmasks. */ |
| 1504 | unsigned long gen_mask, float_mask; |
| 1505 | |
| 1506 | if ((*this_cache) != NULL) |
| 1507 | return (*this_cache); |
| 1508 | cache = FRAME_OBSTACK_ZALLOC (struct mips_frame_cache); |
| 1509 | (*this_cache) = cache; |
| 1510 | cache->saved_regs = trad_frame_alloc_saved_regs (next_frame); |
| 1511 | |
| 1512 | /* Get the mdebug proc descriptor. */ |
| 1513 | proc_desc = non_heuristic_proc_desc (frame_pc_unwind (next_frame), |
| 1514 | &startaddr); |
| 1515 | /* Must be true. This is only called when the sniffer detected a |
| 1516 | proc descriptor. */ |
| 1517 | gdb_assert (proc_desc != NULL); |
| 1518 | |
| 1519 | /* Extract the frame's base. */ |
| 1520 | cache->base = (frame_unwind_register_signed (next_frame, NUM_REGS + PROC_FRAME_REG (proc_desc)) |
| 1521 | + PROC_FRAME_OFFSET (proc_desc) - PROC_FRAME_ADJUST (proc_desc)); |
| 1522 | |
| 1523 | kernel_trap = PROC_REG_MASK (proc_desc) & 1; |
| 1524 | gen_mask = kernel_trap ? 0xFFFFFFFF : PROC_REG_MASK (proc_desc); |
| 1525 | float_mask = kernel_trap ? 0xFFFFFFFF : PROC_FREG_MASK (proc_desc); |
| 1526 | |
| 1527 | /* Must be true. The in_prologue case is left for the heuristic |
| 1528 | unwinder. This is always used on kernel traps. */ |
| 1529 | gdb_assert (!in_prologue (frame_pc_unwind (next_frame), PROC_LOW_ADDR (proc_desc)) |
| 1530 | || kernel_trap); |
| 1531 | |
| 1532 | /* Fill in the offsets for the registers which gen_mask says were |
| 1533 | saved. */ |
| 1534 | { |
| 1535 | CORE_ADDR reg_position = (cache->base + PROC_REG_OFFSET (proc_desc)); |
| 1536 | int ireg; |
| 1537 | |
| 1538 | for (ireg = MIPS_NUMREGS - 1; gen_mask; --ireg, gen_mask <<= 1) |
| 1539 | if (gen_mask & 0x80000000) |
| 1540 | { |
| 1541 | cache->saved_regs[NUM_REGS + ireg].addr = reg_position; |
| 1542 | reg_position -= mips_abi_regsize (gdbarch); |
| 1543 | } |
| 1544 | } |
| 1545 | |
| 1546 | /* The MIPS16 entry instruction saves $s0 and $s1 in the reverse |
| 1547 | order of that normally used by gcc. Therefore, we have to fetch |
| 1548 | the first instruction of the function, and if it's an entry |
| 1549 | instruction that saves $s0 or $s1, correct their saved addresses. */ |
| 1550 | if (pc_is_mips16 (PROC_LOW_ADDR (proc_desc))) |
| 1551 | { |
| 1552 | ULONGEST inst = mips16_fetch_instruction (PROC_LOW_ADDR (proc_desc)); |
| 1553 | if ((inst & 0xf81f) == 0xe809 && (inst & 0x700) != 0x700) |
| 1554 | /* entry */ |
| 1555 | { |
| 1556 | int reg; |
| 1557 | int sreg_count = (inst >> 6) & 3; |
| 1558 | |
| 1559 | /* Check if the ra register was pushed on the stack. */ |
| 1560 | CORE_ADDR reg_position = (cache->base |
| 1561 | + PROC_REG_OFFSET (proc_desc)); |
| 1562 | if (inst & 0x20) |
| 1563 | reg_position -= mips_abi_regsize (gdbarch); |
| 1564 | |
| 1565 | /* Check if the s0 and s1 registers were pushed on the |
| 1566 | stack. */ |
| 1567 | /* NOTE: cagney/2004-02-08: Huh? This is doing no such |
| 1568 | check. */ |
| 1569 | for (reg = 16; reg < sreg_count + 16; reg++) |
| 1570 | { |
| 1571 | cache->saved_regs[NUM_REGS + reg].addr = reg_position; |
| 1572 | reg_position -= mips_abi_regsize (gdbarch); |
| 1573 | } |
| 1574 | } |
| 1575 | } |
| 1576 | |
| 1577 | /* Fill in the offsets for the registers which float_mask says were |
| 1578 | saved. */ |
| 1579 | { |
| 1580 | CORE_ADDR reg_position = (cache->base |
| 1581 | + PROC_FREG_OFFSET (proc_desc)); |
| 1582 | int ireg; |
| 1583 | /* Fill in the offsets for the float registers which float_mask |
| 1584 | says were saved. */ |
| 1585 | for (ireg = MIPS_NUMREGS - 1; float_mask; --ireg, float_mask <<= 1) |
| 1586 | if (float_mask & 0x80000000) |
| 1587 | { |
| 1588 | if (mips_abi_regsize (gdbarch) == 4 |
| 1589 | && TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 1590 | { |
| 1591 | /* On a big endian 32 bit ABI, floating point registers |
| 1592 | are paired to form doubles such that the most |
| 1593 | significant part is in $f[N+1] and the least |
| 1594 | significant in $f[N] vis: $f[N+1] ||| $f[N]. The |
| 1595 | registers are also spilled as a pair and stored as a |
| 1596 | double. |
| 1597 | |
| 1598 | When little-endian the least significant part is |
| 1599 | stored first leading to the memory order $f[N] and |
| 1600 | then $f[N+1]. |
| 1601 | |
| 1602 | Unfortunately, when big-endian the most significant |
| 1603 | part of the double is stored first, and the least |
| 1604 | significant is stored second. This leads to the |
| 1605 | registers being ordered in memory as firt $f[N+1] and |
| 1606 | then $f[N]. |
| 1607 | |
| 1608 | For the big-endian case make certain that the |
| 1609 | addresses point at the correct (swapped) locations |
| 1610 | $f[N] and $f[N+1] pair (keep in mind that |
| 1611 | reg_position is decremented each time through the |
| 1612 | loop). */ |
| 1613 | if ((ireg & 1)) |
| 1614 | cache->saved_regs[NUM_REGS + mips_regnum (current_gdbarch)->fp0 + ireg] |
| 1615 | .addr = reg_position - mips_abi_regsize (gdbarch); |
| 1616 | else |
| 1617 | cache->saved_regs[NUM_REGS + mips_regnum (current_gdbarch)->fp0 + ireg] |
| 1618 | .addr = reg_position + mips_abi_regsize (gdbarch); |
| 1619 | } |
| 1620 | else |
| 1621 | cache->saved_regs[NUM_REGS + mips_regnum (current_gdbarch)->fp0 + ireg] |
| 1622 | .addr = reg_position; |
| 1623 | reg_position -= mips_abi_regsize (gdbarch); |
| 1624 | } |
| 1625 | |
| 1626 | cache->saved_regs[NUM_REGS + mips_regnum (current_gdbarch)->pc] |
| 1627 | = cache->saved_regs[NUM_REGS + RA_REGNUM]; |
| 1628 | } |
| 1629 | |
| 1630 | /* SP_REGNUM, contains the value and not the address. */ |
| 1631 | trad_frame_set_value (cache->saved_regs, NUM_REGS + MIPS_SP_REGNUM, cache->base); |
| 1632 | |
| 1633 | return (*this_cache); |
| 1634 | } |
| 1635 | |
| 1636 | static void |
| 1637 | mips_mdebug_frame_this_id (struct frame_info *next_frame, void **this_cache, |
| 1638 | struct frame_id *this_id) |
| 1639 | { |
| 1640 | struct mips_frame_cache *info = mips_mdebug_frame_cache (next_frame, |
| 1641 | this_cache); |
| 1642 | (*this_id) = frame_id_build (info->base, frame_func_unwind (next_frame)); |
| 1643 | } |
| 1644 | |
| 1645 | static void |
| 1646 | mips_mdebug_frame_prev_register (struct frame_info *next_frame, |
| 1647 | void **this_cache, |
| 1648 | int regnum, int *optimizedp, |
| 1649 | enum lval_type *lvalp, CORE_ADDR *addrp, |
| 1650 | int *realnump, void *valuep) |
| 1651 | { |
| 1652 | struct mips_frame_cache *info = mips_mdebug_frame_cache (next_frame, |
| 1653 | this_cache); |
| 1654 | trad_frame_get_prev_register (next_frame, info->saved_regs, regnum, |
| 1655 | optimizedp, lvalp, addrp, realnump, valuep); |
| 1656 | } |
| 1657 | |
| 1658 | static const struct frame_unwind mips_mdebug_frame_unwind = |
| 1659 | { |
| 1660 | NORMAL_FRAME, |
| 1661 | mips_mdebug_frame_this_id, |
| 1662 | mips_mdebug_frame_prev_register |
| 1663 | }; |
| 1664 | |
| 1665 | static const struct frame_unwind * |
| 1666 | mips_mdebug_frame_sniffer (struct frame_info *next_frame) |
| 1667 | { |
| 1668 | CORE_ADDR pc = frame_pc_unwind (next_frame); |
| 1669 | CORE_ADDR startaddr = 0; |
| 1670 | mips_extra_func_info_t proc_desc; |
| 1671 | int kernel_trap; |
| 1672 | |
| 1673 | /* Only use the mdebug frame unwinder on mdebug frames where all the |
| 1674 | registers have been saved. Leave hard cases such as no mdebug or |
| 1675 | in prologue for the heuristic unwinders. */ |
| 1676 | |
| 1677 | proc_desc = non_heuristic_proc_desc (pc, &startaddr); |
| 1678 | if (proc_desc == NULL) |
| 1679 | return NULL; |
| 1680 | |
| 1681 | /* Not sure exactly what kernel_trap means, but if it means the |
| 1682 | kernel saves the registers without a prologue doing it, we better |
| 1683 | not examine the prologue to see whether registers have been saved |
| 1684 | yet. */ |
| 1685 | kernel_trap = PROC_REG_MASK (proc_desc) & 1; |
| 1686 | if (kernel_trap) |
| 1687 | return &mips_mdebug_frame_unwind; |
| 1688 | |
| 1689 | /* In any frame other than the innermost or a frame interrupted by a |
| 1690 | signal, we assume that all registers have been saved. This |
| 1691 | assumes that all register saves in a function happen before the |
| 1692 | first function call. */ |
| 1693 | if (!in_prologue (pc, PROC_LOW_ADDR (proc_desc))) |
| 1694 | return &mips_mdebug_frame_unwind; |
| 1695 | |
| 1696 | return NULL; |
| 1697 | } |
| 1698 | |
| 1699 | static CORE_ADDR |
| 1700 | mips_mdebug_frame_base_address (struct frame_info *next_frame, |
| 1701 | void **this_cache) |
| 1702 | { |
| 1703 | struct mips_frame_cache *info = mips_mdebug_frame_cache (next_frame, |
| 1704 | this_cache); |
| 1705 | return info->base; |
| 1706 | } |
| 1707 | |
| 1708 | static const struct frame_base mips_mdebug_frame_base = { |
| 1709 | &mips_mdebug_frame_unwind, |
| 1710 | mips_mdebug_frame_base_address, |
| 1711 | mips_mdebug_frame_base_address, |
| 1712 | mips_mdebug_frame_base_address |
| 1713 | }; |
| 1714 | |
| 1715 | static const struct frame_base * |
| 1716 | mips_mdebug_frame_base_sniffer (struct frame_info *next_frame) |
| 1717 | { |
| 1718 | if (mips_mdebug_frame_sniffer (next_frame) != NULL) |
| 1719 | return &mips_mdebug_frame_base; |
| 1720 | else |
| 1721 | return NULL; |
| 1722 | } |
| 1723 | |
| 1724 | /* Heuristic unwinder for 16-bit MIPS instruction set (aka MIPS16). |
| 1725 | Procedures that use the 32-bit instruction set are handled by the |
| 1726 | mips_insn32 unwinder. */ |
| 1727 | |
| 1728 | static struct mips_frame_cache * |
| 1729 | mips_insn16_frame_cache (struct frame_info *next_frame, void **this_cache) |
| 1730 | { |
| 1731 | struct mips_frame_cache *cache; |
| 1732 | |
| 1733 | if ((*this_cache) != NULL) |
| 1734 | return (*this_cache); |
| 1735 | cache = FRAME_OBSTACK_ZALLOC (struct mips_frame_cache); |
| 1736 | (*this_cache) = cache; |
| 1737 | cache->saved_regs = trad_frame_alloc_saved_regs (next_frame); |
| 1738 | |
| 1739 | /* Analyze the function prologue. */ |
| 1740 | { |
| 1741 | const CORE_ADDR pc = frame_pc_unwind (next_frame); |
| 1742 | CORE_ADDR start_addr; |
| 1743 | |
| 1744 | find_pc_partial_function (pc, NULL, &start_addr, NULL); |
| 1745 | if (start_addr == 0) |
| 1746 | start_addr = heuristic_proc_start (pc); |
| 1747 | /* We can't analyze the prologue if we couldn't find the begining |
| 1748 | of the function. */ |
| 1749 | if (start_addr == 0) |
| 1750 | return cache; |
| 1751 | |
| 1752 | mips16_scan_prologue (start_addr, pc, next_frame, *this_cache); |
| 1753 | } |
| 1754 | |
| 1755 | /* SP_REGNUM, contains the value and not the address. */ |
| 1756 | trad_frame_set_value (cache->saved_regs, NUM_REGS + MIPS_SP_REGNUM, cache->base); |
| 1757 | |
| 1758 | return (*this_cache); |
| 1759 | } |
| 1760 | |
| 1761 | static void |
| 1762 | mips_insn16_frame_this_id (struct frame_info *next_frame, void **this_cache, |
| 1763 | struct frame_id *this_id) |
| 1764 | { |
| 1765 | struct mips_frame_cache *info = mips_insn16_frame_cache (next_frame, |
| 1766 | this_cache); |
| 1767 | (*this_id) = frame_id_build (info->base, frame_func_unwind (next_frame)); |
| 1768 | } |
| 1769 | |
| 1770 | static void |
| 1771 | mips_insn16_frame_prev_register (struct frame_info *next_frame, |
| 1772 | void **this_cache, |
| 1773 | int regnum, int *optimizedp, |
| 1774 | enum lval_type *lvalp, CORE_ADDR *addrp, |
| 1775 | int *realnump, void *valuep) |
| 1776 | { |
| 1777 | struct mips_frame_cache *info = mips_insn16_frame_cache (next_frame, |
| 1778 | this_cache); |
| 1779 | trad_frame_get_prev_register (next_frame, info->saved_regs, regnum, |
| 1780 | optimizedp, lvalp, addrp, realnump, valuep); |
| 1781 | } |
| 1782 | |
| 1783 | static const struct frame_unwind mips_insn16_frame_unwind = |
| 1784 | { |
| 1785 | NORMAL_FRAME, |
| 1786 | mips_insn16_frame_this_id, |
| 1787 | mips_insn16_frame_prev_register |
| 1788 | }; |
| 1789 | |
| 1790 | static const struct frame_unwind * |
| 1791 | mips_insn16_frame_sniffer (struct frame_info *next_frame) |
| 1792 | { |
| 1793 | CORE_ADDR pc = frame_pc_unwind (next_frame); |
| 1794 | if (pc_is_mips16 (pc)) |
| 1795 | return &mips_insn16_frame_unwind; |
| 1796 | return NULL; |
| 1797 | } |
| 1798 | |
| 1799 | static CORE_ADDR |
| 1800 | mips_insn16_frame_base_address (struct frame_info *next_frame, |
| 1801 | void **this_cache) |
| 1802 | { |
| 1803 | struct mips_frame_cache *info = mips_insn16_frame_cache (next_frame, |
| 1804 | this_cache); |
| 1805 | return info->base; |
| 1806 | } |
| 1807 | |
| 1808 | static const struct frame_base mips_insn16_frame_base = |
| 1809 | { |
| 1810 | &mips_insn16_frame_unwind, |
| 1811 | mips_insn16_frame_base_address, |
| 1812 | mips_insn16_frame_base_address, |
| 1813 | mips_insn16_frame_base_address |
| 1814 | }; |
| 1815 | |
| 1816 | static const struct frame_base * |
| 1817 | mips_insn16_frame_base_sniffer (struct frame_info *next_frame) |
| 1818 | { |
| 1819 | if (mips_insn16_frame_sniffer (next_frame) != NULL) |
| 1820 | return &mips_insn16_frame_base; |
| 1821 | else |
| 1822 | return NULL; |
| 1823 | } |
| 1824 | |
| 1825 | /* Heuristic unwinder for procedures using 32-bit instructions (covers |
| 1826 | both 32-bit and 64-bit MIPS ISAs). Procedures using 16-bit |
| 1827 | instructions (a.k.a. MIPS16) are handled by the mips_insn16 |
| 1828 | unwinder. */ |
| 1829 | |
| 1830 | static struct mips_frame_cache * |
| 1831 | mips_insn32_frame_cache (struct frame_info *next_frame, void **this_cache) |
| 1832 | { |
| 1833 | struct mips_frame_cache *cache; |
| 1834 | |
| 1835 | if ((*this_cache) != NULL) |
| 1836 | return (*this_cache); |
| 1837 | |
| 1838 | cache = FRAME_OBSTACK_ZALLOC (struct mips_frame_cache); |
| 1839 | (*this_cache) = cache; |
| 1840 | cache->saved_regs = trad_frame_alloc_saved_regs (next_frame); |
| 1841 | |
| 1842 | /* Analyze the function prologue. */ |
| 1843 | { |
| 1844 | const CORE_ADDR pc = frame_pc_unwind (next_frame); |
| 1845 | CORE_ADDR start_addr; |
| 1846 | |
| 1847 | find_pc_partial_function (pc, NULL, &start_addr, NULL); |
| 1848 | if (start_addr == 0) |
| 1849 | start_addr = heuristic_proc_start (pc); |
| 1850 | /* We can't analyze the prologue if we couldn't find the begining |
| 1851 | of the function. */ |
| 1852 | if (start_addr == 0) |
| 1853 | return cache; |
| 1854 | |
| 1855 | mips32_scan_prologue (start_addr, pc, next_frame, *this_cache); |
| 1856 | } |
| 1857 | |
| 1858 | /* SP_REGNUM, contains the value and not the address. */ |
| 1859 | trad_frame_set_value (cache->saved_regs, NUM_REGS + MIPS_SP_REGNUM, cache->base); |
| 1860 | |
| 1861 | return (*this_cache); |
| 1862 | } |
| 1863 | |
| 1864 | static void |
| 1865 | mips_insn32_frame_this_id (struct frame_info *next_frame, void **this_cache, |
| 1866 | struct frame_id *this_id) |
| 1867 | { |
| 1868 | struct mips_frame_cache *info = mips_insn32_frame_cache (next_frame, |
| 1869 | this_cache); |
| 1870 | (*this_id) = frame_id_build (info->base, frame_func_unwind (next_frame)); |
| 1871 | } |
| 1872 | |
| 1873 | static void |
| 1874 | mips_insn32_frame_prev_register (struct frame_info *next_frame, |
| 1875 | void **this_cache, |
| 1876 | int regnum, int *optimizedp, |
| 1877 | enum lval_type *lvalp, CORE_ADDR *addrp, |
| 1878 | int *realnump, void *valuep) |
| 1879 | { |
| 1880 | struct mips_frame_cache *info = mips_insn32_frame_cache (next_frame, |
| 1881 | this_cache); |
| 1882 | trad_frame_get_prev_register (next_frame, info->saved_regs, regnum, |
| 1883 | optimizedp, lvalp, addrp, realnump, valuep); |
| 1884 | } |
| 1885 | |
| 1886 | static const struct frame_unwind mips_insn32_frame_unwind = |
| 1887 | { |
| 1888 | NORMAL_FRAME, |
| 1889 | mips_insn32_frame_this_id, |
| 1890 | mips_insn32_frame_prev_register |
| 1891 | }; |
| 1892 | |
| 1893 | static const struct frame_unwind * |
| 1894 | mips_insn32_frame_sniffer (struct frame_info *next_frame) |
| 1895 | { |
| 1896 | CORE_ADDR pc = frame_pc_unwind (next_frame); |
| 1897 | if (! pc_is_mips16 (pc)) |
| 1898 | return &mips_insn32_frame_unwind; |
| 1899 | return NULL; |
| 1900 | } |
| 1901 | |
| 1902 | static CORE_ADDR |
| 1903 | mips_insn32_frame_base_address (struct frame_info *next_frame, |
| 1904 | void **this_cache) |
| 1905 | { |
| 1906 | struct mips_frame_cache *info = mips_insn32_frame_cache (next_frame, |
| 1907 | this_cache); |
| 1908 | return info->base; |
| 1909 | } |
| 1910 | |
| 1911 | static const struct frame_base mips_insn32_frame_base = |
| 1912 | { |
| 1913 | &mips_insn32_frame_unwind, |
| 1914 | mips_insn32_frame_base_address, |
| 1915 | mips_insn32_frame_base_address, |
| 1916 | mips_insn32_frame_base_address |
| 1917 | }; |
| 1918 | |
| 1919 | static const struct frame_base * |
| 1920 | mips_insn32_frame_base_sniffer (struct frame_info *next_frame) |
| 1921 | { |
| 1922 | if (mips_insn32_frame_sniffer (next_frame) != NULL) |
| 1923 | return &mips_insn32_frame_base; |
| 1924 | else |
| 1925 | return NULL; |
| 1926 | } |
| 1927 | |
| 1928 | static struct trad_frame_cache * |
| 1929 | mips_stub_frame_cache (struct frame_info *next_frame, void **this_cache) |
| 1930 | { |
| 1931 | CORE_ADDR pc; |
| 1932 | CORE_ADDR start_addr; |
| 1933 | CORE_ADDR stack_addr; |
| 1934 | struct trad_frame_cache *this_trad_cache; |
| 1935 | |
| 1936 | if ((*this_cache) != NULL) |
| 1937 | return (*this_cache); |
| 1938 | this_trad_cache = trad_frame_cache_zalloc (next_frame); |
| 1939 | (*this_cache) = this_trad_cache; |
| 1940 | |
| 1941 | /* The return address is in the link register. */ |
| 1942 | trad_frame_set_reg_realreg (this_trad_cache, PC_REGNUM, RA_REGNUM); |
| 1943 | |
| 1944 | /* Frame ID, since it's a frameless / stackless function, no stack |
| 1945 | space is allocated and SP on entry is the current SP. */ |
| 1946 | pc = frame_pc_unwind (next_frame); |
| 1947 | find_pc_partial_function (pc, NULL, &start_addr, NULL); |
| 1948 | stack_addr = frame_unwind_register_signed (next_frame, SP_REGNUM); |
| 1949 | trad_frame_set_id (this_trad_cache, frame_id_build (start_addr, stack_addr)); |
| 1950 | |
| 1951 | /* Assume that the frame's base is the same as the |
| 1952 | stack-pointer. */ |
| 1953 | trad_frame_set_this_base (this_trad_cache, stack_addr); |
| 1954 | |
| 1955 | return this_trad_cache; |
| 1956 | } |
| 1957 | |
| 1958 | static void |
| 1959 | mips_stub_frame_this_id (struct frame_info *next_frame, void **this_cache, |
| 1960 | struct frame_id *this_id) |
| 1961 | { |
| 1962 | struct trad_frame_cache *this_trad_cache |
| 1963 | = mips_stub_frame_cache (next_frame, this_cache); |
| 1964 | trad_frame_get_id (this_trad_cache, this_id); |
| 1965 | } |
| 1966 | |
| 1967 | static void |
| 1968 | mips_stub_frame_prev_register (struct frame_info *next_frame, |
| 1969 | void **this_cache, |
| 1970 | int regnum, int *optimizedp, |
| 1971 | enum lval_type *lvalp, CORE_ADDR *addrp, |
| 1972 | int *realnump, void *valuep) |
| 1973 | { |
| 1974 | struct trad_frame_cache *this_trad_cache |
| 1975 | = mips_stub_frame_cache (next_frame, this_cache); |
| 1976 | trad_frame_get_register (this_trad_cache, next_frame, regnum, optimizedp, |
| 1977 | lvalp, addrp, realnump, valuep); |
| 1978 | } |
| 1979 | |
| 1980 | static const struct frame_unwind mips_stub_frame_unwind = |
| 1981 | { |
| 1982 | NORMAL_FRAME, |
| 1983 | mips_stub_frame_this_id, |
| 1984 | mips_stub_frame_prev_register |
| 1985 | }; |
| 1986 | |
| 1987 | static const struct frame_unwind * |
| 1988 | mips_stub_frame_sniffer (struct frame_info *next_frame) |
| 1989 | { |
| 1990 | CORE_ADDR pc = frame_pc_unwind (next_frame); |
| 1991 | if (in_plt_section (pc, NULL)) |
| 1992 | return &mips_stub_frame_unwind; |
| 1993 | else |
| 1994 | return NULL; |
| 1995 | } |
| 1996 | |
| 1997 | static CORE_ADDR |
| 1998 | mips_stub_frame_base_address (struct frame_info *next_frame, |
| 1999 | void **this_cache) |
| 2000 | { |
| 2001 | struct trad_frame_cache *this_trad_cache |
| 2002 | = mips_stub_frame_cache (next_frame, this_cache); |
| 2003 | return trad_frame_get_this_base (this_trad_cache); |
| 2004 | } |
| 2005 | |
| 2006 | static const struct frame_base mips_stub_frame_base = |
| 2007 | { |
| 2008 | &mips_stub_frame_unwind, |
| 2009 | mips_stub_frame_base_address, |
| 2010 | mips_stub_frame_base_address, |
| 2011 | mips_stub_frame_base_address |
| 2012 | }; |
| 2013 | |
| 2014 | static const struct frame_base * |
| 2015 | mips_stub_frame_base_sniffer (struct frame_info *next_frame) |
| 2016 | { |
| 2017 | if (mips_stub_frame_sniffer (next_frame) != NULL) |
| 2018 | return &mips_stub_frame_base; |
| 2019 | else |
| 2020 | return NULL; |
| 2021 | } |
| 2022 | |
| 2023 | static CORE_ADDR |
| 2024 | read_next_frame_reg (struct frame_info *fi, int regno) |
| 2025 | { |
| 2026 | /* Always a pseudo. */ |
| 2027 | gdb_assert (regno >= NUM_REGS); |
| 2028 | if (fi == NULL) |
| 2029 | { |
| 2030 | LONGEST val; |
| 2031 | regcache_cooked_read_signed (current_regcache, regno, &val); |
| 2032 | return val; |
| 2033 | } |
| 2034 | else |
| 2035 | return frame_unwind_register_signed (fi, regno); |
| 2036 | |
| 2037 | } |
| 2038 | |
| 2039 | /* mips_addr_bits_remove - remove useless address bits */ |
| 2040 | |
| 2041 | static CORE_ADDR |
| 2042 | mips_addr_bits_remove (CORE_ADDR addr) |
| 2043 | { |
| 2044 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 2045 | if (mips_mask_address_p (tdep) && (((ULONGEST) addr) >> 32 == 0xffffffffUL)) |
| 2046 | /* This hack is a work-around for existing boards using PMON, the |
| 2047 | simulator, and any other 64-bit targets that doesn't have true |
| 2048 | 64-bit addressing. On these targets, the upper 32 bits of |
| 2049 | addresses are ignored by the hardware. Thus, the PC or SP are |
| 2050 | likely to have been sign extended to all 1s by instruction |
| 2051 | sequences that load 32-bit addresses. For example, a typical |
| 2052 | piece of code that loads an address is this: |
| 2053 | |
| 2054 | lui $r2, <upper 16 bits> |
| 2055 | ori $r2, <lower 16 bits> |
| 2056 | |
| 2057 | But the lui sign-extends the value such that the upper 32 bits |
| 2058 | may be all 1s. The workaround is simply to mask off these |
| 2059 | bits. In the future, gcc may be changed to support true 64-bit |
| 2060 | addressing, and this masking will have to be disabled. */ |
| 2061 | return addr &= 0xffffffffUL; |
| 2062 | else |
| 2063 | return addr; |
| 2064 | } |
| 2065 | |
| 2066 | /* mips_software_single_step() is called just before we want to resume |
| 2067 | the inferior, if we want to single-step it but there is no hardware |
| 2068 | or kernel single-step support (MIPS on GNU/Linux for example). We find |
| 2069 | the target of the coming instruction and breakpoint it. |
| 2070 | |
| 2071 | single_step is also called just after the inferior stops. If we had |
| 2072 | set up a simulated single-step, we undo our damage. */ |
| 2073 | |
| 2074 | void |
| 2075 | mips_software_single_step (enum target_signal sig, int insert_breakpoints_p) |
| 2076 | { |
| 2077 | static CORE_ADDR next_pc; |
| 2078 | typedef char binsn_quantum[BREAKPOINT_MAX]; |
| 2079 | static binsn_quantum break_mem; |
| 2080 | CORE_ADDR pc; |
| 2081 | |
| 2082 | if (insert_breakpoints_p) |
| 2083 | { |
| 2084 | pc = read_register (mips_regnum (current_gdbarch)->pc); |
| 2085 | next_pc = mips_next_pc (pc); |
| 2086 | |
| 2087 | target_insert_breakpoint (next_pc, break_mem); |
| 2088 | } |
| 2089 | else |
| 2090 | target_remove_breakpoint (next_pc, break_mem); |
| 2091 | } |
| 2092 | |
| 2093 | static struct mips_extra_func_info temp_proc_desc; |
| 2094 | |
| 2095 | /* Set a register's saved stack address in temp_saved_regs. If an |
| 2096 | address has already been set for this register, do nothing; this |
| 2097 | way we will only recognize the first save of a given register in a |
| 2098 | function prologue. |
| 2099 | |
| 2100 | For simplicity, save the address in both [0 .. NUM_REGS) and |
| 2101 | [NUM_REGS .. 2*NUM_REGS). Strictly speaking, only the second range |
| 2102 | is used as it is only second range (the ABI instead of ISA |
| 2103 | registers) that comes into play when finding saved registers in a |
| 2104 | frame. */ |
| 2105 | |
| 2106 | static void |
| 2107 | set_reg_offset (struct mips_frame_cache *this_cache, int regnum, |
| 2108 | CORE_ADDR offset) |
| 2109 | { |
| 2110 | if (this_cache != NULL |
| 2111 | && this_cache->saved_regs[regnum].addr == -1) |
| 2112 | { |
| 2113 | this_cache->saved_regs[regnum + 0 * NUM_REGS].addr = offset; |
| 2114 | this_cache->saved_regs[regnum + 1 * NUM_REGS].addr = offset; |
| 2115 | } |
| 2116 | } |
| 2117 | |
| 2118 | |
| 2119 | /* Test whether the PC points to the return instruction at the |
| 2120 | end of a function. */ |
| 2121 | |
| 2122 | static int |
| 2123 | mips_about_to_return (CORE_ADDR pc) |
| 2124 | { |
| 2125 | if (pc_is_mips16 (pc)) |
| 2126 | /* This mips16 case isn't necessarily reliable. Sometimes the compiler |
| 2127 | generates a "jr $ra"; other times it generates code to load |
| 2128 | the return address from the stack to an accessible register (such |
| 2129 | as $a3), then a "jr" using that register. This second case |
| 2130 | is almost impossible to distinguish from an indirect jump |
| 2131 | used for switch statements, so we don't even try. */ |
| 2132 | return mips_fetch_instruction (pc) == 0xe820; /* jr $ra */ |
| 2133 | else |
| 2134 | return mips_fetch_instruction (pc) == 0x3e00008; /* jr $ra */ |
| 2135 | } |
| 2136 | |
| 2137 | |
| 2138 | /* This fencepost looks highly suspicious to me. Removing it also |
| 2139 | seems suspicious as it could affect remote debugging across serial |
| 2140 | lines. */ |
| 2141 | |
| 2142 | static CORE_ADDR |
| 2143 | heuristic_proc_start (CORE_ADDR pc) |
| 2144 | { |
| 2145 | CORE_ADDR start_pc; |
| 2146 | CORE_ADDR fence; |
| 2147 | int instlen; |
| 2148 | int seen_adjsp = 0; |
| 2149 | |
| 2150 | pc = ADDR_BITS_REMOVE (pc); |
| 2151 | start_pc = pc; |
| 2152 | fence = start_pc - heuristic_fence_post; |
| 2153 | if (start_pc == 0) |
| 2154 | return 0; |
| 2155 | |
| 2156 | if (heuristic_fence_post == UINT_MAX || fence < VM_MIN_ADDRESS) |
| 2157 | fence = VM_MIN_ADDRESS; |
| 2158 | |
| 2159 | instlen = pc_is_mips16 (pc) ? MIPS16_INSTLEN : MIPS_INSTLEN; |
| 2160 | |
| 2161 | /* search back for previous return */ |
| 2162 | for (start_pc -= instlen;; start_pc -= instlen) |
| 2163 | if (start_pc < fence) |
| 2164 | { |
| 2165 | /* It's not clear to me why we reach this point when |
| 2166 | stop_soon, but with this test, at least we |
| 2167 | don't print out warnings for every child forked (eg, on |
| 2168 | decstation). 22apr93 rich@cygnus.com. */ |
| 2169 | if (stop_soon == NO_STOP_QUIETLY) |
| 2170 | { |
| 2171 | static int blurb_printed = 0; |
| 2172 | |
| 2173 | warning ("GDB can't find the start of the function at 0x%s.", |
| 2174 | paddr_nz (pc)); |
| 2175 | |
| 2176 | if (!blurb_printed) |
| 2177 | { |
| 2178 | /* This actually happens frequently in embedded |
| 2179 | development, when you first connect to a board |
| 2180 | and your stack pointer and pc are nowhere in |
| 2181 | particular. This message needs to give people |
| 2182 | in that situation enough information to |
| 2183 | determine that it's no big deal. */ |
| 2184 | printf_filtered ("\n\ |
| 2185 | GDB is unable to find the start of the function at 0x%s\n\ |
| 2186 | and thus can't determine the size of that function's stack frame.\n\ |
| 2187 | This means that GDB may be unable to access that stack frame, or\n\ |
| 2188 | the frames below it.\n\ |
| 2189 | This problem is most likely caused by an invalid program counter or\n\ |
| 2190 | stack pointer.\n\ |
| 2191 | However, if you think GDB should simply search farther back\n\ |
| 2192 | from 0x%s for code which looks like the beginning of a\n\ |
| 2193 | function, you can increase the range of the search using the `set\n\ |
| 2194 | heuristic-fence-post' command.\n", paddr_nz (pc), paddr_nz (pc)); |
| 2195 | blurb_printed = 1; |
| 2196 | } |
| 2197 | } |
| 2198 | |
| 2199 | return 0; |
| 2200 | } |
| 2201 | else if (pc_is_mips16 (start_pc)) |
| 2202 | { |
| 2203 | unsigned short inst; |
| 2204 | |
| 2205 | /* On MIPS16, any one of the following is likely to be the |
| 2206 | start of a function: |
| 2207 | entry |
| 2208 | addiu sp,-n |
| 2209 | daddiu sp,-n |
| 2210 | extend -n followed by 'addiu sp,+n' or 'daddiu sp,+n' */ |
| 2211 | inst = mips_fetch_instruction (start_pc); |
| 2212 | if (((inst & 0xf81f) == 0xe809 && (inst & 0x700) != 0x700) /* entry */ |
| 2213 | || (inst & 0xff80) == 0x6380 /* addiu sp,-n */ |
| 2214 | || (inst & 0xff80) == 0xfb80 /* daddiu sp,-n */ |
| 2215 | || ((inst & 0xf810) == 0xf010 && seen_adjsp)) /* extend -n */ |
| 2216 | break; |
| 2217 | else if ((inst & 0xff00) == 0x6300 /* addiu sp */ |
| 2218 | || (inst & 0xff00) == 0xfb00) /* daddiu sp */ |
| 2219 | seen_adjsp = 1; |
| 2220 | else |
| 2221 | seen_adjsp = 0; |
| 2222 | } |
| 2223 | else if (mips_about_to_return (start_pc)) |
| 2224 | { |
| 2225 | start_pc += 2 * MIPS_INSTLEN; /* skip return, and its delay slot */ |
| 2226 | break; |
| 2227 | } |
| 2228 | |
| 2229 | return start_pc; |
| 2230 | } |
| 2231 | |
| 2232 | /* Fetch the immediate value from a MIPS16 instruction. |
| 2233 | If the previous instruction was an EXTEND, use it to extend |
| 2234 | the upper bits of the immediate value. This is a helper function |
| 2235 | for mips16_scan_prologue. */ |
| 2236 | |
| 2237 | static int |
| 2238 | mips16_get_imm (unsigned short prev_inst, /* previous instruction */ |
| 2239 | unsigned short inst, /* current instruction */ |
| 2240 | int nbits, /* number of bits in imm field */ |
| 2241 | int scale, /* scale factor to be applied to imm */ |
| 2242 | int is_signed) /* is the imm field signed? */ |
| 2243 | { |
| 2244 | int offset; |
| 2245 | |
| 2246 | if ((prev_inst & 0xf800) == 0xf000) /* prev instruction was EXTEND? */ |
| 2247 | { |
| 2248 | offset = ((prev_inst & 0x1f) << 11) | (prev_inst & 0x7e0); |
| 2249 | if (offset & 0x8000) /* check for negative extend */ |
| 2250 | offset = 0 - (0x10000 - (offset & 0xffff)); |
| 2251 | return offset | (inst & 0x1f); |
| 2252 | } |
| 2253 | else |
| 2254 | { |
| 2255 | int max_imm = 1 << nbits; |
| 2256 | int mask = max_imm - 1; |
| 2257 | int sign_bit = max_imm >> 1; |
| 2258 | |
| 2259 | offset = inst & mask; |
| 2260 | if (is_signed && (offset & sign_bit)) |
| 2261 | offset = 0 - (max_imm - offset); |
| 2262 | return offset * scale; |
| 2263 | } |
| 2264 | } |
| 2265 | |
| 2266 | |
| 2267 | /* Analyze the function prologue from START_PC to LIMIT_PC. Builds |
| 2268 | the associated FRAME_CACHE if not null. |
| 2269 | Return the address of the first instruction past the prologue. */ |
| 2270 | |
| 2271 | static CORE_ADDR |
| 2272 | mips16_scan_prologue (CORE_ADDR start_pc, CORE_ADDR limit_pc, |
| 2273 | struct frame_info *next_frame, |
| 2274 | struct mips_frame_cache *this_cache) |
| 2275 | { |
| 2276 | CORE_ADDR cur_pc; |
| 2277 | CORE_ADDR frame_addr = 0; /* Value of $r17, used as frame pointer */ |
| 2278 | CORE_ADDR sp; |
| 2279 | long frame_offset = 0; /* Size of stack frame. */ |
| 2280 | long frame_adjust = 0; /* Offset of FP from SP. */ |
| 2281 | int frame_reg = MIPS_SP_REGNUM; |
| 2282 | unsigned short prev_inst = 0; /* saved copy of previous instruction */ |
| 2283 | unsigned inst = 0; /* current instruction */ |
| 2284 | unsigned entry_inst = 0; /* the entry instruction */ |
| 2285 | int reg, offset; |
| 2286 | |
| 2287 | int extend_bytes = 0; |
| 2288 | int prev_extend_bytes; |
| 2289 | CORE_ADDR end_prologue_addr = 0; |
| 2290 | |
| 2291 | /* Can be called when there's no process, and hence when there's no |
| 2292 | NEXT_FRAME. */ |
| 2293 | if (next_frame != NULL) |
| 2294 | sp = read_next_frame_reg (next_frame, NUM_REGS + MIPS_SP_REGNUM); |
| 2295 | else |
| 2296 | sp = 0; |
| 2297 | |
| 2298 | if (limit_pc > start_pc + 200) |
| 2299 | limit_pc = start_pc + 200; |
| 2300 | |
| 2301 | for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += MIPS16_INSTLEN) |
| 2302 | { |
| 2303 | /* Save the previous instruction. If it's an EXTEND, we'll extract |
| 2304 | the immediate offset extension from it in mips16_get_imm. */ |
| 2305 | prev_inst = inst; |
| 2306 | |
| 2307 | /* Fetch and decode the instruction. */ |
| 2308 | inst = (unsigned short) mips_fetch_instruction (cur_pc); |
| 2309 | |
| 2310 | /* Normally we ignore extend instructions. However, if it is |
| 2311 | not followed by a valid prologue instruction, then this |
| 2312 | instruction is not part of the prologue either. We must |
| 2313 | remember in this case to adjust the end_prologue_addr back |
| 2314 | over the extend. */ |
| 2315 | if ((inst & 0xf800) == 0xf000) /* extend */ |
| 2316 | { |
| 2317 | extend_bytes = MIPS16_INSTLEN; |
| 2318 | continue; |
| 2319 | } |
| 2320 | |
| 2321 | prev_extend_bytes = extend_bytes; |
| 2322 | extend_bytes = 0; |
| 2323 | |
| 2324 | if ((inst & 0xff00) == 0x6300 /* addiu sp */ |
| 2325 | || (inst & 0xff00) == 0xfb00) /* daddiu sp */ |
| 2326 | { |
| 2327 | offset = mips16_get_imm (prev_inst, inst, 8, 8, 1); |
| 2328 | if (offset < 0) /* negative stack adjustment? */ |
| 2329 | frame_offset -= offset; |
| 2330 | else |
| 2331 | /* Exit loop if a positive stack adjustment is found, which |
| 2332 | usually means that the stack cleanup code in the function |
| 2333 | epilogue is reached. */ |
| 2334 | break; |
| 2335 | } |
| 2336 | else if ((inst & 0xf800) == 0xd000) /* sw reg,n($sp) */ |
| 2337 | { |
| 2338 | offset = mips16_get_imm (prev_inst, inst, 8, 4, 0); |
| 2339 | reg = mips16_to_32_reg[(inst & 0x700) >> 8]; |
| 2340 | set_reg_offset (this_cache, reg, sp + offset); |
| 2341 | } |
| 2342 | else if ((inst & 0xff00) == 0xf900) /* sd reg,n($sp) */ |
| 2343 | { |
| 2344 | offset = mips16_get_imm (prev_inst, inst, 5, 8, 0); |
| 2345 | reg = mips16_to_32_reg[(inst & 0xe0) >> 5]; |
| 2346 | set_reg_offset (this_cache, reg, sp + offset); |
| 2347 | } |
| 2348 | else if ((inst & 0xff00) == 0x6200) /* sw $ra,n($sp) */ |
| 2349 | { |
| 2350 | offset = mips16_get_imm (prev_inst, inst, 8, 4, 0); |
| 2351 | set_reg_offset (this_cache, RA_REGNUM, sp + offset); |
| 2352 | } |
| 2353 | else if ((inst & 0xff00) == 0xfa00) /* sd $ra,n($sp) */ |
| 2354 | { |
| 2355 | offset = mips16_get_imm (prev_inst, inst, 8, 8, 0); |
| 2356 | set_reg_offset (this_cache, RA_REGNUM, sp + offset); |
| 2357 | } |
| 2358 | else if (inst == 0x673d) /* move $s1, $sp */ |
| 2359 | { |
| 2360 | frame_addr = sp; |
| 2361 | frame_reg = 17; |
| 2362 | } |
| 2363 | else if ((inst & 0xff00) == 0x0100) /* addiu $s1,sp,n */ |
| 2364 | { |
| 2365 | offset = mips16_get_imm (prev_inst, inst, 8, 4, 0); |
| 2366 | frame_addr = sp + offset; |
| 2367 | frame_reg = 17; |
| 2368 | frame_adjust = offset; |
| 2369 | } |
| 2370 | else if ((inst & 0xFF00) == 0xd900) /* sw reg,offset($s1) */ |
| 2371 | { |
| 2372 | offset = mips16_get_imm (prev_inst, inst, 5, 4, 0); |
| 2373 | reg = mips16_to_32_reg[(inst & 0xe0) >> 5]; |
| 2374 | set_reg_offset (this_cache, reg, frame_addr + offset); |
| 2375 | } |
| 2376 | else if ((inst & 0xFF00) == 0x7900) /* sd reg,offset($s1) */ |
| 2377 | { |
| 2378 | offset = mips16_get_imm (prev_inst, inst, 5, 8, 0); |
| 2379 | reg = mips16_to_32_reg[(inst & 0xe0) >> 5]; |
| 2380 | set_reg_offset (this_cache, reg, frame_addr + offset); |
| 2381 | } |
| 2382 | else if ((inst & 0xf81f) == 0xe809 |
| 2383 | && (inst & 0x700) != 0x700) /* entry */ |
| 2384 | entry_inst = inst; /* save for later processing */ |
| 2385 | else if ((inst & 0xf800) == 0x1800) /* jal(x) */ |
| 2386 | cur_pc += MIPS16_INSTLEN; /* 32-bit instruction */ |
| 2387 | else if ((inst & 0xff1c) == 0x6704) /* move reg,$a0-$a3 */ |
| 2388 | { |
| 2389 | /* This instruction is part of the prologue, but we don't |
| 2390 | need to do anything special to handle it. */ |
| 2391 | } |
| 2392 | else |
| 2393 | { |
| 2394 | /* This instruction is not an instruction typically found |
| 2395 | in a prologue, so we must have reached the end of the |
| 2396 | prologue. */ |
| 2397 | if (end_prologue_addr == 0) |
| 2398 | end_prologue_addr = cur_pc - prev_extend_bytes; |
| 2399 | } |
| 2400 | } |
| 2401 | |
| 2402 | /* The entry instruction is typically the first instruction in a function, |
| 2403 | and it stores registers at offsets relative to the value of the old SP |
| 2404 | (before the prologue). But the value of the sp parameter to this |
| 2405 | function is the new SP (after the prologue has been executed). So we |
| 2406 | can't calculate those offsets until we've seen the entire prologue, |
| 2407 | and can calculate what the old SP must have been. */ |
| 2408 | if (entry_inst != 0) |
| 2409 | { |
| 2410 | int areg_count = (entry_inst >> 8) & 7; |
| 2411 | int sreg_count = (entry_inst >> 6) & 3; |
| 2412 | |
| 2413 | /* The entry instruction always subtracts 32 from the SP. */ |
| 2414 | frame_offset += 32; |
| 2415 | |
| 2416 | /* Now we can calculate what the SP must have been at the |
| 2417 | start of the function prologue. */ |
| 2418 | sp += frame_offset; |
| 2419 | |
| 2420 | /* Check if a0-a3 were saved in the caller's argument save area. */ |
| 2421 | for (reg = 4, offset = 0; reg < areg_count + 4; reg++) |
| 2422 | { |
| 2423 | set_reg_offset (this_cache, reg, sp + offset); |
| 2424 | offset += mips_abi_regsize (current_gdbarch); |
| 2425 | } |
| 2426 | |
| 2427 | /* Check if the ra register was pushed on the stack. */ |
| 2428 | offset = -4; |
| 2429 | if (entry_inst & 0x20) |
| 2430 | { |
| 2431 | set_reg_offset (this_cache, RA_REGNUM, sp + offset); |
| 2432 | offset -= mips_abi_regsize (current_gdbarch); |
| 2433 | } |
| 2434 | |
| 2435 | /* Check if the s0 and s1 registers were pushed on the stack. */ |
| 2436 | for (reg = 16; reg < sreg_count + 16; reg++) |
| 2437 | { |
| 2438 | set_reg_offset (this_cache, reg, sp + offset); |
| 2439 | offset -= mips_abi_regsize (current_gdbarch); |
| 2440 | } |
| 2441 | } |
| 2442 | |
| 2443 | if (this_cache != NULL) |
| 2444 | { |
| 2445 | this_cache->base = |
| 2446 | (frame_unwind_register_signed (next_frame, NUM_REGS + frame_reg) |
| 2447 | + frame_offset - frame_adjust); |
| 2448 | /* FIXME: brobecker/2004-10-10: Just as in the mips32 case, we should |
| 2449 | be able to get rid of the assignment below, evetually. But it's |
| 2450 | still needed for now. */ |
| 2451 | this_cache->saved_regs[NUM_REGS + mips_regnum (current_gdbarch)->pc] |
| 2452 | = this_cache->saved_regs[NUM_REGS + RA_REGNUM]; |
| 2453 | } |
| 2454 | |
| 2455 | /* If we didn't reach the end of the prologue when scanning the function |
| 2456 | instructions, then set end_prologue_addr to the address of the |
| 2457 | instruction immediately after the last one we scanned. */ |
| 2458 | if (end_prologue_addr == 0) |
| 2459 | end_prologue_addr = cur_pc; |
| 2460 | |
| 2461 | return end_prologue_addr; |
| 2462 | } |
| 2463 | |
| 2464 | /* Mark all the registers as unset in the saved_regs array |
| 2465 | of THIS_CACHE. Do nothing if THIS_CACHE is null. */ |
| 2466 | |
| 2467 | void |
| 2468 | reset_saved_regs (struct mips_frame_cache *this_cache) |
| 2469 | { |
| 2470 | if (this_cache == NULL || this_cache->saved_regs == NULL) |
| 2471 | return; |
| 2472 | |
| 2473 | { |
| 2474 | const int num_regs = NUM_REGS; |
| 2475 | int i; |
| 2476 | |
| 2477 | for (i = 0; i < num_regs; i++) |
| 2478 | { |
| 2479 | this_cache->saved_regs[i].addr = -1; |
| 2480 | } |
| 2481 | } |
| 2482 | } |
| 2483 | |
| 2484 | /* Analyze the function prologue from START_PC to LIMIT_PC. Builds |
| 2485 | the associated FRAME_CACHE if not null. |
| 2486 | Return the address of the first instruction past the prologue. */ |
| 2487 | |
| 2488 | static CORE_ADDR |
| 2489 | mips32_scan_prologue (CORE_ADDR start_pc, CORE_ADDR limit_pc, |
| 2490 | struct frame_info *next_frame, |
| 2491 | struct mips_frame_cache *this_cache) |
| 2492 | { |
| 2493 | CORE_ADDR cur_pc; |
| 2494 | CORE_ADDR frame_addr = 0; /* Value of $r30. Used by gcc for frame-pointer */ |
| 2495 | CORE_ADDR sp; |
| 2496 | long frame_offset; |
| 2497 | int frame_reg = MIPS_SP_REGNUM; |
| 2498 | |
| 2499 | CORE_ADDR end_prologue_addr = 0; |
| 2500 | int seen_sp_adjust = 0; |
| 2501 | int load_immediate_bytes = 0; |
| 2502 | |
| 2503 | /* Can be called when there's no process, and hence when there's no |
| 2504 | NEXT_FRAME. */ |
| 2505 | if (next_frame != NULL) |
| 2506 | sp = read_next_frame_reg (next_frame, NUM_REGS + MIPS_SP_REGNUM); |
| 2507 | else |
| 2508 | sp = 0; |
| 2509 | |
| 2510 | if (limit_pc > start_pc + 200) |
| 2511 | limit_pc = start_pc + 200; |
| 2512 | |
| 2513 | restart: |
| 2514 | |
| 2515 | frame_offset = 0; |
| 2516 | for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += MIPS_INSTLEN) |
| 2517 | { |
| 2518 | unsigned long inst, high_word, low_word; |
| 2519 | int reg; |
| 2520 | |
| 2521 | /* Fetch the instruction. */ |
| 2522 | inst = (unsigned long) mips_fetch_instruction (cur_pc); |
| 2523 | |
| 2524 | /* Save some code by pre-extracting some useful fields. */ |
| 2525 | high_word = (inst >> 16) & 0xffff; |
| 2526 | low_word = inst & 0xffff; |
| 2527 | reg = high_word & 0x1f; |
| 2528 | |
| 2529 | if (high_word == 0x27bd /* addiu $sp,$sp,-i */ |
| 2530 | || high_word == 0x23bd /* addi $sp,$sp,-i */ |
| 2531 | || high_word == 0x67bd) /* daddiu $sp,$sp,-i */ |
| 2532 | { |
| 2533 | if (low_word & 0x8000) /* negative stack adjustment? */ |
| 2534 | frame_offset += 0x10000 - low_word; |
| 2535 | else |
| 2536 | /* Exit loop if a positive stack adjustment is found, which |
| 2537 | usually means that the stack cleanup code in the function |
| 2538 | epilogue is reached. */ |
| 2539 | break; |
| 2540 | seen_sp_adjust = 1; |
| 2541 | } |
| 2542 | else if ((high_word & 0xFFE0) == 0xafa0) /* sw reg,offset($sp) */ |
| 2543 | { |
| 2544 | set_reg_offset (this_cache, reg, sp + low_word); |
| 2545 | } |
| 2546 | else if ((high_word & 0xFFE0) == 0xffa0) /* sd reg,offset($sp) */ |
| 2547 | { |
| 2548 | /* Irix 6.2 N32 ABI uses sd instructions for saving $gp and $ra. */ |
| 2549 | set_reg_offset (this_cache, reg, sp + low_word); |
| 2550 | } |
| 2551 | else if (high_word == 0x27be) /* addiu $30,$sp,size */ |
| 2552 | { |
| 2553 | /* Old gcc frame, r30 is virtual frame pointer. */ |
| 2554 | if ((long) low_word != frame_offset) |
| 2555 | frame_addr = sp + low_word; |
| 2556 | else if (frame_reg == MIPS_SP_REGNUM) |
| 2557 | { |
| 2558 | unsigned alloca_adjust; |
| 2559 | |
| 2560 | frame_reg = 30; |
| 2561 | frame_addr = read_next_frame_reg (next_frame, NUM_REGS + 30); |
| 2562 | alloca_adjust = (unsigned) (frame_addr - (sp + low_word)); |
| 2563 | if (alloca_adjust > 0) |
| 2564 | { |
| 2565 | /* FP > SP + frame_size. This may be because of |
| 2566 | an alloca or somethings similar. Fix sp to |
| 2567 | "pre-alloca" value, and try again. */ |
| 2568 | sp += alloca_adjust; |
| 2569 | /* Need to reset the status of all registers. Otherwise, |
| 2570 | we will hit a guard that prevents the new address |
| 2571 | for each register to be recomputed during the second |
| 2572 | pass. */ |
| 2573 | reset_saved_regs (this_cache); |
| 2574 | goto restart; |
| 2575 | } |
| 2576 | } |
| 2577 | } |
| 2578 | /* move $30,$sp. With different versions of gas this will be either |
| 2579 | `addu $30,$sp,$zero' or `or $30,$sp,$zero' or `daddu 30,sp,$0'. |
| 2580 | Accept any one of these. */ |
| 2581 | else if (inst == 0x03A0F021 || inst == 0x03a0f025 || inst == 0x03a0f02d) |
| 2582 | { |
| 2583 | /* New gcc frame, virtual frame pointer is at r30 + frame_size. */ |
| 2584 | if (frame_reg == MIPS_SP_REGNUM) |
| 2585 | { |
| 2586 | unsigned alloca_adjust; |
| 2587 | |
| 2588 | frame_reg = 30; |
| 2589 | frame_addr = read_next_frame_reg (next_frame, NUM_REGS + 30); |
| 2590 | alloca_adjust = (unsigned) (frame_addr - sp); |
| 2591 | if (alloca_adjust > 0) |
| 2592 | { |
| 2593 | /* FP > SP + frame_size. This may be because of |
| 2594 | an alloca or somethings similar. Fix sp to |
| 2595 | "pre-alloca" value, and try again. */ |
| 2596 | sp = frame_addr; |
| 2597 | /* Need to reset the status of all registers. Otherwise, |
| 2598 | we will hit a guard that prevents the new address |
| 2599 | for each register to be recomputed during the second |
| 2600 | pass. */ |
| 2601 | reset_saved_regs (this_cache); |
| 2602 | goto restart; |
| 2603 | } |
| 2604 | } |
| 2605 | } |
| 2606 | else if ((high_word & 0xFFE0) == 0xafc0) /* sw reg,offset($30) */ |
| 2607 | { |
| 2608 | set_reg_offset (this_cache, reg, frame_addr + low_word); |
| 2609 | } |
| 2610 | else if ((high_word & 0xFFE0) == 0xE7A0 /* swc1 freg,n($sp) */ |
| 2611 | || (high_word & 0xF3E0) == 0xA3C0 /* sx reg,n($s8) */ |
| 2612 | || (inst & 0xFF9F07FF) == 0x00800021 /* move reg,$a0-$a3 */ |
| 2613 | || high_word == 0x3c1c /* lui $gp,n */ |
| 2614 | || high_word == 0x279c /* addiu $gp,$gp,n */ |
| 2615 | || inst == 0x0399e021 /* addu $gp,$gp,$t9 */ |
| 2616 | || inst == 0x033ce021 /* addu $gp,$t9,$gp */ |
| 2617 | ) |
| 2618 | { |
| 2619 | /* These instructions are part of the prologue, but we don't |
| 2620 | need to do anything special to handle them. */ |
| 2621 | } |
| 2622 | /* The instructions below load $at or $t0 with an immediate |
| 2623 | value in preparation for a stack adjustment via |
| 2624 | subu $sp,$sp,[$at,$t0]. These instructions could also |
| 2625 | initialize a local variable, so we accept them only before |
| 2626 | a stack adjustment instruction was seen. */ |
| 2627 | else if (!seen_sp_adjust |
| 2628 | && (high_word == 0x3c01 /* lui $at,n */ |
| 2629 | || high_word == 0x3c08 /* lui $t0,n */ |
| 2630 | || high_word == 0x3421 /* ori $at,$at,n */ |
| 2631 | || high_word == 0x3508 /* ori $t0,$t0,n */ |
| 2632 | || high_word == 0x3401 /* ori $at,$zero,n */ |
| 2633 | || high_word == 0x3408 /* ori $t0,$zero,n */ |
| 2634 | )) |
| 2635 | { |
| 2636 | load_immediate_bytes += MIPS_INSTLEN; /* FIXME!! */ |
| 2637 | } |
| 2638 | else |
| 2639 | { |
| 2640 | /* This instruction is not an instruction typically found |
| 2641 | in a prologue, so we must have reached the end of the |
| 2642 | prologue. */ |
| 2643 | /* FIXME: brobecker/2004-10-10: Can't we just break out of this |
| 2644 | loop now? Why would we need to continue scanning the function |
| 2645 | instructions? */ |
| 2646 | if (end_prologue_addr == 0) |
| 2647 | end_prologue_addr = cur_pc; |
| 2648 | } |
| 2649 | } |
| 2650 | |
| 2651 | if (this_cache != NULL) |
| 2652 | { |
| 2653 | this_cache->base = |
| 2654 | (frame_unwind_register_signed (next_frame, NUM_REGS + frame_reg) |
| 2655 | + frame_offset); |
| 2656 | /* FIXME: brobecker/2004-09-15: We should be able to get rid of |
| 2657 | this assignment below, eventually. But it's still needed |
| 2658 | for now. */ |
| 2659 | this_cache->saved_regs[NUM_REGS + mips_regnum (current_gdbarch)->pc] |
| 2660 | = this_cache->saved_regs[NUM_REGS + RA_REGNUM]; |
| 2661 | } |
| 2662 | |
| 2663 | /* If we didn't reach the end of the prologue when scanning the function |
| 2664 | instructions, then set end_prologue_addr to the address of the |
| 2665 | instruction immediately after the last one we scanned. */ |
| 2666 | /* brobecker/2004-10-10: I don't think this would ever happen, but |
| 2667 | we may as well be careful and do our best if we have a null |
| 2668 | end_prologue_addr. */ |
| 2669 | if (end_prologue_addr == 0) |
| 2670 | end_prologue_addr = cur_pc; |
| 2671 | |
| 2672 | /* In a frameless function, we might have incorrectly |
| 2673 | skipped some load immediate instructions. Undo the skipping |
| 2674 | if the load immediate was not followed by a stack adjustment. */ |
| 2675 | if (load_immediate_bytes && !seen_sp_adjust) |
| 2676 | end_prologue_addr -= load_immediate_bytes; |
| 2677 | |
| 2678 | return end_prologue_addr; |
| 2679 | } |
| 2680 | |
| 2681 | static mips_extra_func_info_t |
| 2682 | heuristic_proc_desc (CORE_ADDR start_pc, CORE_ADDR limit_pc, |
| 2683 | struct frame_info *next_frame, |
| 2684 | struct mips_frame_cache *this_cache) |
| 2685 | { |
| 2686 | if (start_pc == 0) |
| 2687 | return NULL; |
| 2688 | |
| 2689 | memset (&temp_proc_desc, '\0', sizeof (temp_proc_desc)); |
| 2690 | PROC_LOW_ADDR (&temp_proc_desc) = start_pc; |
| 2691 | PROC_FRAME_REG (&temp_proc_desc) = MIPS_SP_REGNUM; |
| 2692 | PROC_PC_REG (&temp_proc_desc) = RA_REGNUM; |
| 2693 | |
| 2694 | if (pc_is_mips16 (start_pc)) |
| 2695 | mips16_scan_prologue (start_pc, limit_pc, next_frame, this_cache); |
| 2696 | else |
| 2697 | mips32_scan_prologue (start_pc, limit_pc, next_frame, this_cache); |
| 2698 | |
| 2699 | return &temp_proc_desc; |
| 2700 | } |
| 2701 | |
| 2702 | struct mips_objfile_private |
| 2703 | { |
| 2704 | bfd_size_type size; |
| 2705 | char *contents; |
| 2706 | }; |
| 2707 | |
| 2708 | /* Global used to communicate between non_heuristic_proc_desc and |
| 2709 | compare_pdr_entries within qsort (). */ |
| 2710 | static bfd *the_bfd; |
| 2711 | |
| 2712 | static int |
| 2713 | compare_pdr_entries (const void *a, const void *b) |
| 2714 | { |
| 2715 | CORE_ADDR lhs = bfd_get_32 (the_bfd, (bfd_byte *) a); |
| 2716 | CORE_ADDR rhs = bfd_get_32 (the_bfd, (bfd_byte *) b); |
| 2717 | |
| 2718 | if (lhs < rhs) |
| 2719 | return -1; |
| 2720 | else if (lhs == rhs) |
| 2721 | return 0; |
| 2722 | else |
| 2723 | return 1; |
| 2724 | } |
| 2725 | |
| 2726 | static mips_extra_func_info_t |
| 2727 | non_heuristic_proc_desc (CORE_ADDR pc, CORE_ADDR *addrptr) |
| 2728 | { |
| 2729 | CORE_ADDR startaddr; |
| 2730 | mips_extra_func_info_t proc_desc; |
| 2731 | struct block *b = block_for_pc (pc); |
| 2732 | struct symbol *sym; |
| 2733 | struct obj_section *sec; |
| 2734 | struct mips_objfile_private *priv; |
| 2735 | |
| 2736 | find_pc_partial_function (pc, NULL, &startaddr, NULL); |
| 2737 | if (addrptr) |
| 2738 | *addrptr = startaddr; |
| 2739 | |
| 2740 | priv = NULL; |
| 2741 | |
| 2742 | sec = find_pc_section (pc); |
| 2743 | if (sec != NULL) |
| 2744 | { |
| 2745 | priv = (struct mips_objfile_private *) objfile_data (sec->objfile, mips_pdr_data); |
| 2746 | |
| 2747 | /* Search the ".pdr" section generated by GAS. This includes most of |
| 2748 | the information normally found in ECOFF PDRs. */ |
| 2749 | |
| 2750 | the_bfd = sec->objfile->obfd; |
| 2751 | if (priv == NULL |
| 2752 | && (the_bfd->format == bfd_object |
| 2753 | && bfd_get_flavour (the_bfd) == bfd_target_elf_flavour |
| 2754 | && elf_elfheader (the_bfd)->e_ident[EI_CLASS] == ELFCLASS64)) |
| 2755 | { |
| 2756 | /* Right now GAS only outputs the address as a four-byte sequence. |
| 2757 | This means that we should not bother with this method on 64-bit |
| 2758 | targets (until that is fixed). */ |
| 2759 | |
| 2760 | priv = obstack_alloc (&sec->objfile->objfile_obstack, |
| 2761 | sizeof (struct mips_objfile_private)); |
| 2762 | priv->size = 0; |
| 2763 | set_objfile_data (sec->objfile, mips_pdr_data, priv); |
| 2764 | } |
| 2765 | else if (priv == NULL) |
| 2766 | { |
| 2767 | asection *bfdsec; |
| 2768 | |
| 2769 | priv = obstack_alloc (&sec->objfile->objfile_obstack, |
| 2770 | sizeof (struct mips_objfile_private)); |
| 2771 | |
| 2772 | bfdsec = bfd_get_section_by_name (sec->objfile->obfd, ".pdr"); |
| 2773 | if (bfdsec != NULL) |
| 2774 | { |
| 2775 | priv->size = bfd_section_size (sec->objfile->obfd, bfdsec); |
| 2776 | priv->contents = obstack_alloc (&sec->objfile->objfile_obstack, |
| 2777 | priv->size); |
| 2778 | bfd_get_section_contents (sec->objfile->obfd, bfdsec, |
| 2779 | priv->contents, 0, priv->size); |
| 2780 | |
| 2781 | /* In general, the .pdr section is sorted. However, in the |
| 2782 | presence of multiple code sections (and other corner cases) |
| 2783 | it can become unsorted. Sort it so that we can use a faster |
| 2784 | binary search. */ |
| 2785 | qsort (priv->contents, priv->size / 32, 32, |
| 2786 | compare_pdr_entries); |
| 2787 | } |
| 2788 | else |
| 2789 | priv->size = 0; |
| 2790 | |
| 2791 | set_objfile_data (sec->objfile, mips_pdr_data, priv); |
| 2792 | } |
| 2793 | the_bfd = NULL; |
| 2794 | |
| 2795 | if (priv->size != 0) |
| 2796 | { |
| 2797 | int low, mid, high; |
| 2798 | char *ptr; |
| 2799 | CORE_ADDR pdr_pc; |
| 2800 | |
| 2801 | low = 0; |
| 2802 | high = priv->size / 32; |
| 2803 | |
| 2804 | /* We've found a .pdr section describing this objfile. We want to |
| 2805 | find the entry which describes this code address. The .pdr |
| 2806 | information is not very descriptive; we have only a function |
| 2807 | start address. We have to look for the closest entry, because |
| 2808 | the local symbol at the beginning of this function may have |
| 2809 | been stripped - so if we ask the symbol table for the start |
| 2810 | address we may get a preceding global function. */ |
| 2811 | |
| 2812 | /* First, find the last .pdr entry starting at or before PC. */ |
| 2813 | do |
| 2814 | { |
| 2815 | mid = (low + high) / 2; |
| 2816 | |
| 2817 | ptr = priv->contents + mid * 32; |
| 2818 | pdr_pc = bfd_get_signed_32 (sec->objfile->obfd, ptr); |
| 2819 | pdr_pc += ANOFFSET (sec->objfile->section_offsets, |
| 2820 | SECT_OFF_TEXT (sec->objfile)); |
| 2821 | |
| 2822 | if (pdr_pc > pc) |
| 2823 | high = mid; |
| 2824 | else |
| 2825 | low = mid + 1; |
| 2826 | } |
| 2827 | while (low != high); |
| 2828 | |
| 2829 | /* Both low and high point one past the PDR of interest. If |
| 2830 | both are zero, that means this PC is before any region |
| 2831 | covered by a PDR, i.e. pdr_pc for the first PDR entry is |
| 2832 | greater than PC. */ |
| 2833 | if (low > 0) |
| 2834 | { |
| 2835 | ptr = priv->contents + (low - 1) * 32; |
| 2836 | pdr_pc = bfd_get_signed_32 (sec->objfile->obfd, ptr); |
| 2837 | pdr_pc += ANOFFSET (sec->objfile->section_offsets, |
| 2838 | SECT_OFF_TEXT (sec->objfile)); |
| 2839 | } |
| 2840 | |
| 2841 | /* We don't have a range, so we have no way to know for sure |
| 2842 | whether we're in the correct PDR or a PDR for a preceding |
| 2843 | function and the current function was a stripped local |
| 2844 | symbol. But if the PDR's PC is at least as great as the |
| 2845 | best guess from the symbol table, assume that it does cover |
| 2846 | the right area; if a .pdr section is present at all then |
| 2847 | nearly every function will have an entry. The biggest exception |
| 2848 | will be the dynamic linker stubs; conveniently these are |
| 2849 | placed before .text instead of after. */ |
| 2850 | |
| 2851 | if (pc >= pdr_pc && pdr_pc >= startaddr) |
| 2852 | { |
| 2853 | struct symbol *sym = find_pc_function (pc); |
| 2854 | |
| 2855 | if (addrptr) |
| 2856 | *addrptr = pdr_pc; |
| 2857 | |
| 2858 | /* Fill in what we need of the proc_desc. */ |
| 2859 | proc_desc = (mips_extra_func_info_t) |
| 2860 | obstack_alloc (&sec->objfile->objfile_obstack, |
| 2861 | sizeof (struct mips_extra_func_info)); |
| 2862 | PROC_LOW_ADDR (proc_desc) = pdr_pc; |
| 2863 | |
| 2864 | /* Only used for dummy frames. */ |
| 2865 | PROC_HIGH_ADDR (proc_desc) = 0; |
| 2866 | |
| 2867 | PROC_FRAME_OFFSET (proc_desc) |
| 2868 | = bfd_get_32 (sec->objfile->obfd, ptr + 20); |
| 2869 | PROC_FRAME_REG (proc_desc) = bfd_get_32 (sec->objfile->obfd, |
| 2870 | ptr + 24); |
| 2871 | PROC_FRAME_ADJUST (proc_desc) = 0; |
| 2872 | PROC_REG_MASK (proc_desc) = bfd_get_32 (sec->objfile->obfd, |
| 2873 | ptr + 4); |
| 2874 | PROC_FREG_MASK (proc_desc) = bfd_get_32 (sec->objfile->obfd, |
| 2875 | ptr + 12); |
| 2876 | PROC_REG_OFFSET (proc_desc) = bfd_get_32 (sec->objfile->obfd, |
| 2877 | ptr + 8); |
| 2878 | PROC_FREG_OFFSET (proc_desc) |
| 2879 | = bfd_get_32 (sec->objfile->obfd, ptr + 16); |
| 2880 | PROC_PC_REG (proc_desc) = bfd_get_32 (sec->objfile->obfd, |
| 2881 | ptr + 28); |
| 2882 | proc_desc->pdr.isym = (long) sym; |
| 2883 | |
| 2884 | return proc_desc; |
| 2885 | } |
| 2886 | } |
| 2887 | } |
| 2888 | |
| 2889 | if (b == NULL) |
| 2890 | return NULL; |
| 2891 | |
| 2892 | if (startaddr > BLOCK_START (b)) |
| 2893 | { |
| 2894 | /* This is the "pathological" case referred to in a comment in |
| 2895 | print_frame_info. It might be better to move this check into |
| 2896 | symbol reading. */ |
| 2897 | return NULL; |
| 2898 | } |
| 2899 | |
| 2900 | sym = lookup_symbol (MIPS_EFI_SYMBOL_NAME, b, LABEL_DOMAIN, 0, NULL); |
| 2901 | |
| 2902 | /* If we never found a PDR for this function in symbol reading, then |
| 2903 | examine prologues to find the information. */ |
| 2904 | if (sym) |
| 2905 | { |
| 2906 | proc_desc = (mips_extra_func_info_t) SYMBOL_VALUE (sym); |
| 2907 | if (PROC_FRAME_REG (proc_desc) == -1) |
| 2908 | return NULL; |
| 2909 | else |
| 2910 | return proc_desc; |
| 2911 | } |
| 2912 | else |
| 2913 | return NULL; |
| 2914 | } |
| 2915 | |
| 2916 | /* MIPS stack frames are almost impenetrable. When execution stops, |
| 2917 | we basically have to look at symbol information for the function |
| 2918 | that we stopped in, which tells us *which* register (if any) is |
| 2919 | the base of the frame pointer, and what offset from that register |
| 2920 | the frame itself is at. |
| 2921 | |
| 2922 | This presents a problem when trying to examine a stack in memory |
| 2923 | (that isn't executing at the moment), using the "frame" command. We |
| 2924 | don't have a PC, nor do we have any registers except SP. |
| 2925 | |
| 2926 | This routine takes two arguments, SP and PC, and tries to make the |
| 2927 | cached frames look as if these two arguments defined a frame on the |
| 2928 | cache. This allows the rest of info frame to extract the important |
| 2929 | arguments without difficulty. */ |
| 2930 | |
| 2931 | struct frame_info * |
| 2932 | setup_arbitrary_frame (int argc, CORE_ADDR *argv) |
| 2933 | { |
| 2934 | if (argc != 2) |
| 2935 | error ("MIPS frame specifications require two arguments: sp and pc"); |
| 2936 | |
| 2937 | return create_new_frame (argv[0], argv[1]); |
| 2938 | } |
| 2939 | |
| 2940 | /* According to the current ABI, should the type be passed in a |
| 2941 | floating-point register (assuming that there is space)? When there |
| 2942 | is no FPU, FP are not even considered as possibile candidates for |
| 2943 | FP registers and, consequently this returns false - forces FP |
| 2944 | arguments into integer registers. */ |
| 2945 | |
| 2946 | static int |
| 2947 | fp_register_arg_p (enum type_code typecode, struct type *arg_type) |
| 2948 | { |
| 2949 | return ((typecode == TYPE_CODE_FLT |
| 2950 | || (MIPS_EABI |
| 2951 | && (typecode == TYPE_CODE_STRUCT |
| 2952 | || typecode == TYPE_CODE_UNION) |
| 2953 | && TYPE_NFIELDS (arg_type) == 1 |
| 2954 | && TYPE_CODE (TYPE_FIELD_TYPE (arg_type, 0)) == TYPE_CODE_FLT)) |
| 2955 | && MIPS_FPU_TYPE != MIPS_FPU_NONE); |
| 2956 | } |
| 2957 | |
| 2958 | /* On o32, argument passing in GPRs depends on the alignment of the type being |
| 2959 | passed. Return 1 if this type must be aligned to a doubleword boundary. */ |
| 2960 | |
| 2961 | static int |
| 2962 | mips_type_needs_double_align (struct type *type) |
| 2963 | { |
| 2964 | enum type_code typecode = TYPE_CODE (type); |
| 2965 | |
| 2966 | if (typecode == TYPE_CODE_FLT && TYPE_LENGTH (type) == 8) |
| 2967 | return 1; |
| 2968 | else if (typecode == TYPE_CODE_STRUCT) |
| 2969 | { |
| 2970 | if (TYPE_NFIELDS (type) < 1) |
| 2971 | return 0; |
| 2972 | return mips_type_needs_double_align (TYPE_FIELD_TYPE (type, 0)); |
| 2973 | } |
| 2974 | else if (typecode == TYPE_CODE_UNION) |
| 2975 | { |
| 2976 | int i, n; |
| 2977 | |
| 2978 | n = TYPE_NFIELDS (type); |
| 2979 | for (i = 0; i < n; i++) |
| 2980 | if (mips_type_needs_double_align (TYPE_FIELD_TYPE (type, i))) |
| 2981 | return 1; |
| 2982 | return 0; |
| 2983 | } |
| 2984 | return 0; |
| 2985 | } |
| 2986 | |
| 2987 | /* Adjust the address downward (direction of stack growth) so that it |
| 2988 | is correctly aligned for a new stack frame. */ |
| 2989 | static CORE_ADDR |
| 2990 | mips_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr) |
| 2991 | { |
| 2992 | return align_down (addr, 16); |
| 2993 | } |
| 2994 | |
| 2995 | /* Determine how a return value is stored within the MIPS register |
| 2996 | file, given the return type `valtype'. */ |
| 2997 | |
| 2998 | struct return_value_word |
| 2999 | { |
| 3000 | int len; |
| 3001 | int reg; |
| 3002 | int reg_offset; |
| 3003 | int buf_offset; |
| 3004 | }; |
| 3005 | |
| 3006 | static void |
| 3007 | return_value_location (struct type *valtype, |
| 3008 | struct return_value_word *hi, |
| 3009 | struct return_value_word *lo) |
| 3010 | { |
| 3011 | int len = TYPE_LENGTH (valtype); |
| 3012 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 3013 | |
| 3014 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT |
| 3015 | && ((MIPS_FPU_TYPE == MIPS_FPU_DOUBLE && (len == 4 || len == 8)) |
| 3016 | || (MIPS_FPU_TYPE == MIPS_FPU_SINGLE && len == 4))) |
| 3017 | { |
| 3018 | if (mips_abi_regsize (current_gdbarch) < 8 && len == 8) |
| 3019 | { |
| 3020 | /* We need to break a 64bit float in two 32 bit halves and |
| 3021 | spread them across a floating-point register pair. */ |
| 3022 | lo->buf_offset = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? 4 : 0; |
| 3023 | hi->buf_offset = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? 0 : 4; |
| 3024 | lo->reg_offset = ((TARGET_BYTE_ORDER == BFD_ENDIAN_BIG |
| 3025 | && register_size (current_gdbarch, |
| 3026 | mips_regnum (current_gdbarch)-> |
| 3027 | fp0) == 8) ? 4 : 0); |
| 3028 | hi->reg_offset = lo->reg_offset; |
| 3029 | lo->reg = mips_regnum (current_gdbarch)->fp0 + 0; |
| 3030 | hi->reg = mips_regnum (current_gdbarch)->fp0 + 1; |
| 3031 | lo->len = 4; |
| 3032 | hi->len = 4; |
| 3033 | } |
| 3034 | else |
| 3035 | { |
| 3036 | /* The floating point value fits in a single floating-point |
| 3037 | register. */ |
| 3038 | lo->reg_offset = ((TARGET_BYTE_ORDER == BFD_ENDIAN_BIG |
| 3039 | && register_size (current_gdbarch, |
| 3040 | mips_regnum (current_gdbarch)-> |
| 3041 | fp0) == 8 |
| 3042 | && len == 4) ? 4 : 0); |
| 3043 | lo->reg = mips_regnum (current_gdbarch)->fp0; |
| 3044 | lo->len = len; |
| 3045 | lo->buf_offset = 0; |
| 3046 | hi->len = 0; |
| 3047 | hi->reg_offset = 0; |
| 3048 | hi->buf_offset = 0; |
| 3049 | hi->reg = 0; |
| 3050 | } |
| 3051 | } |
| 3052 | else |
| 3053 | { |
| 3054 | /* Locate a result possibly spread across two registers. */ |
| 3055 | int regnum = 2; |
| 3056 | lo->reg = regnum + 0; |
| 3057 | hi->reg = regnum + 1; |
| 3058 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG |
| 3059 | && len < mips_abi_regsize (current_gdbarch)) |
| 3060 | { |
| 3061 | /* "un-left-justify" the value in the low register */ |
| 3062 | lo->reg_offset = mips_abi_regsize (current_gdbarch) - len; |
| 3063 | lo->len = len; |
| 3064 | hi->reg_offset = 0; |
| 3065 | hi->len = 0; |
| 3066 | } |
| 3067 | else if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG && len > mips_abi_regsize (current_gdbarch) /* odd-size structs */ |
| 3068 | && len < mips_abi_regsize (current_gdbarch) * 2 |
| 3069 | && (TYPE_CODE (valtype) == TYPE_CODE_STRUCT || |
| 3070 | TYPE_CODE (valtype) == TYPE_CODE_UNION)) |
| 3071 | { |
| 3072 | /* "un-left-justify" the value spread across two registers. */ |
| 3073 | lo->reg_offset = 2 * mips_abi_regsize (current_gdbarch) - len; |
| 3074 | lo->len = mips_abi_regsize (current_gdbarch) - lo->reg_offset; |
| 3075 | hi->reg_offset = 0; |
| 3076 | hi->len = len - lo->len; |
| 3077 | } |
| 3078 | else |
| 3079 | { |
| 3080 | /* Only perform a partial copy of the second register. */ |
| 3081 | lo->reg_offset = 0; |
| 3082 | hi->reg_offset = 0; |
| 3083 | if (len > mips_abi_regsize (current_gdbarch)) |
| 3084 | { |
| 3085 | lo->len = mips_abi_regsize (current_gdbarch); |
| 3086 | hi->len = len - mips_abi_regsize (current_gdbarch); |
| 3087 | } |
| 3088 | else |
| 3089 | { |
| 3090 | lo->len = len; |
| 3091 | hi->len = 0; |
| 3092 | } |
| 3093 | } |
| 3094 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG |
| 3095 | && register_size (current_gdbarch, regnum) == 8 |
| 3096 | && mips_abi_regsize (current_gdbarch) == 4) |
| 3097 | { |
| 3098 | /* Account for the fact that only the least-signficant part |
| 3099 | of the register is being used */ |
| 3100 | lo->reg_offset += 4; |
| 3101 | hi->reg_offset += 4; |
| 3102 | } |
| 3103 | lo->buf_offset = 0; |
| 3104 | hi->buf_offset = lo->len; |
| 3105 | } |
| 3106 | } |
| 3107 | |
| 3108 | /* Should call_function allocate stack space for a struct return? */ |
| 3109 | |
| 3110 | static int |
| 3111 | mips_eabi_use_struct_convention (int gcc_p, struct type *type) |
| 3112 | { |
| 3113 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 3114 | return (TYPE_LENGTH (type) > 2 * mips_abi_regsize (current_gdbarch)); |
| 3115 | } |
| 3116 | |
| 3117 | /* Should call_function pass struct by reference? |
| 3118 | For each architecture, structs are passed either by |
| 3119 | value or by reference, depending on their size. */ |
| 3120 | |
| 3121 | static int |
| 3122 | mips_eabi_reg_struct_has_addr (int gcc_p, struct type *type) |
| 3123 | { |
| 3124 | enum type_code typecode = TYPE_CODE (check_typedef (type)); |
| 3125 | int len = TYPE_LENGTH (check_typedef (type)); |
| 3126 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 3127 | |
| 3128 | if (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION) |
| 3129 | return (len > mips_abi_regsize (current_gdbarch)); |
| 3130 | |
| 3131 | return 0; |
| 3132 | } |
| 3133 | |
| 3134 | static CORE_ADDR |
| 3135 | mips_eabi_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
| 3136 | struct regcache *regcache, CORE_ADDR bp_addr, |
| 3137 | int nargs, struct value **args, CORE_ADDR sp, |
| 3138 | int struct_return, CORE_ADDR struct_addr) |
| 3139 | { |
| 3140 | int argreg; |
| 3141 | int float_argreg; |
| 3142 | int argnum; |
| 3143 | int len = 0; |
| 3144 | int stack_offset = 0; |
| 3145 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 3146 | CORE_ADDR func_addr = find_function_addr (function, NULL); |
| 3147 | |
| 3148 | /* For shared libraries, "t9" needs to point at the function |
| 3149 | address. */ |
| 3150 | regcache_cooked_write_signed (regcache, T9_REGNUM, func_addr); |
| 3151 | |
| 3152 | /* Set the return address register to point to the entry point of |
| 3153 | the program, where a breakpoint lies in wait. */ |
| 3154 | regcache_cooked_write_signed (regcache, RA_REGNUM, bp_addr); |
| 3155 | |
| 3156 | /* First ensure that the stack and structure return address (if any) |
| 3157 | are properly aligned. The stack has to be at least 64-bit |
| 3158 | aligned even on 32-bit machines, because doubles must be 64-bit |
| 3159 | aligned. For n32 and n64, stack frames need to be 128-bit |
| 3160 | aligned, so we round to this widest known alignment. */ |
| 3161 | |
| 3162 | sp = align_down (sp, 16); |
| 3163 | struct_addr = align_down (struct_addr, 16); |
| 3164 | |
| 3165 | /* Now make space on the stack for the args. We allocate more |
| 3166 | than necessary for EABI, because the first few arguments are |
| 3167 | passed in registers, but that's OK. */ |
| 3168 | for (argnum = 0; argnum < nargs; argnum++) |
| 3169 | len += align_up (TYPE_LENGTH (VALUE_TYPE (args[argnum])), |
| 3170 | mips_stack_argsize (gdbarch)); |
| 3171 | sp -= align_up (len, 16); |
| 3172 | |
| 3173 | if (mips_debug) |
| 3174 | fprintf_unfiltered (gdb_stdlog, |
| 3175 | "mips_eabi_push_dummy_call: sp=0x%s allocated %ld\n", |
| 3176 | paddr_nz (sp), (long) align_up (len, 16)); |
| 3177 | |
| 3178 | /* Initialize the integer and float register pointers. */ |
| 3179 | argreg = A0_REGNUM; |
| 3180 | float_argreg = mips_fpa0_regnum (current_gdbarch); |
| 3181 | |
| 3182 | /* The struct_return pointer occupies the first parameter-passing reg. */ |
| 3183 | if (struct_return) |
| 3184 | { |
| 3185 | if (mips_debug) |
| 3186 | fprintf_unfiltered (gdb_stdlog, |
| 3187 | "mips_eabi_push_dummy_call: struct_return reg=%d 0x%s\n", |
| 3188 | argreg, paddr_nz (struct_addr)); |
| 3189 | write_register (argreg++, struct_addr); |
| 3190 | } |
| 3191 | |
| 3192 | /* Now load as many as possible of the first arguments into |
| 3193 | registers, and push the rest onto the stack. Loop thru args |
| 3194 | from first to last. */ |
| 3195 | for (argnum = 0; argnum < nargs; argnum++) |
| 3196 | { |
| 3197 | char *val; |
| 3198 | char valbuf[MAX_REGISTER_SIZE]; |
| 3199 | struct value *arg = args[argnum]; |
| 3200 | struct type *arg_type = check_typedef (VALUE_TYPE (arg)); |
| 3201 | int len = TYPE_LENGTH (arg_type); |
| 3202 | enum type_code typecode = TYPE_CODE (arg_type); |
| 3203 | |
| 3204 | if (mips_debug) |
| 3205 | fprintf_unfiltered (gdb_stdlog, |
| 3206 | "mips_eabi_push_dummy_call: %d len=%d type=%d", |
| 3207 | argnum + 1, len, (int) typecode); |
| 3208 | |
| 3209 | /* The EABI passes structures that do not fit in a register by |
| 3210 | reference. */ |
| 3211 | if (len > mips_abi_regsize (gdbarch) |
| 3212 | && (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION)) |
| 3213 | { |
| 3214 | store_unsigned_integer (valbuf, mips_abi_regsize (gdbarch), |
| 3215 | VALUE_ADDRESS (arg)); |
| 3216 | typecode = TYPE_CODE_PTR; |
| 3217 | len = mips_abi_regsize (gdbarch); |
| 3218 | val = valbuf; |
| 3219 | if (mips_debug) |
| 3220 | fprintf_unfiltered (gdb_stdlog, " push"); |
| 3221 | } |
| 3222 | else |
| 3223 | val = (char *) VALUE_CONTENTS (arg); |
| 3224 | |
| 3225 | /* 32-bit ABIs always start floating point arguments in an |
| 3226 | even-numbered floating point register. Round the FP register |
| 3227 | up before the check to see if there are any FP registers |
| 3228 | left. Non MIPS_EABI targets also pass the FP in the integer |
| 3229 | registers so also round up normal registers. */ |
| 3230 | if (mips_abi_regsize (gdbarch) < 8 |
| 3231 | && fp_register_arg_p (typecode, arg_type)) |
| 3232 | { |
| 3233 | if ((float_argreg & 1)) |
| 3234 | float_argreg++; |
| 3235 | } |
| 3236 | |
| 3237 | /* Floating point arguments passed in registers have to be |
| 3238 | treated specially. On 32-bit architectures, doubles |
| 3239 | are passed in register pairs; the even register gets |
| 3240 | the low word, and the odd register gets the high word. |
| 3241 | On non-EABI processors, the first two floating point arguments are |
| 3242 | also copied to general registers, because MIPS16 functions |
| 3243 | don't use float registers for arguments. This duplication of |
| 3244 | arguments in general registers can't hurt non-MIPS16 functions |
| 3245 | because those registers are normally skipped. */ |
| 3246 | /* MIPS_EABI squeezes a struct that contains a single floating |
| 3247 | point value into an FP register instead of pushing it onto the |
| 3248 | stack. */ |
| 3249 | if (fp_register_arg_p (typecode, arg_type) |
| 3250 | && float_argreg <= MIPS_LAST_FP_ARG_REGNUM) |
| 3251 | { |
| 3252 | if (mips_abi_regsize (gdbarch) < 8 && len == 8) |
| 3253 | { |
| 3254 | int low_offset = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? 4 : 0; |
| 3255 | unsigned long regval; |
| 3256 | |
| 3257 | /* Write the low word of the double to the even register(s). */ |
| 3258 | regval = extract_unsigned_integer (val + low_offset, 4); |
| 3259 | if (mips_debug) |
| 3260 | fprintf_unfiltered (gdb_stdlog, " - fpreg=%d val=%s", |
| 3261 | float_argreg, phex (regval, 4)); |
| 3262 | write_register (float_argreg++, regval); |
| 3263 | |
| 3264 | /* Write the high word of the double to the odd register(s). */ |
| 3265 | regval = extract_unsigned_integer (val + 4 - low_offset, 4); |
| 3266 | if (mips_debug) |
| 3267 | fprintf_unfiltered (gdb_stdlog, " - fpreg=%d val=%s", |
| 3268 | float_argreg, phex (regval, 4)); |
| 3269 | write_register (float_argreg++, regval); |
| 3270 | } |
| 3271 | else |
| 3272 | { |
| 3273 | /* This is a floating point value that fits entirely |
| 3274 | in a single register. */ |
| 3275 | /* On 32 bit ABI's the float_argreg is further adjusted |
| 3276 | above to ensure that it is even register aligned. */ |
| 3277 | LONGEST regval = extract_unsigned_integer (val, len); |
| 3278 | if (mips_debug) |
| 3279 | fprintf_unfiltered (gdb_stdlog, " - fpreg=%d val=%s", |
| 3280 | float_argreg, phex (regval, len)); |
| 3281 | write_register (float_argreg++, regval); |
| 3282 | } |
| 3283 | } |
| 3284 | else |
| 3285 | { |
| 3286 | /* Copy the argument to general registers or the stack in |
| 3287 | register-sized pieces. Large arguments are split between |
| 3288 | registers and stack. */ |
| 3289 | /* Note: structs whose size is not a multiple of |
| 3290 | mips_abi_regsize() are treated specially: Irix cc passes |
| 3291 | them in registers where gcc sometimes puts them on the |
| 3292 | stack. For maximum compatibility, we will put them in |
| 3293 | both places. */ |
| 3294 | int odd_sized_struct = ((len > mips_abi_regsize (gdbarch)) |
| 3295 | && (len % mips_abi_regsize (gdbarch) != 0)); |
| 3296 | |
| 3297 | /* Note: Floating-point values that didn't fit into an FP |
| 3298 | register are only written to memory. */ |
| 3299 | while (len > 0) |
| 3300 | { |
| 3301 | /* Remember if the argument was written to the stack. */ |
| 3302 | int stack_used_p = 0; |
| 3303 | int partial_len = (len < mips_abi_regsize (gdbarch) |
| 3304 | ? len : mips_abi_regsize (gdbarch)); |
| 3305 | |
| 3306 | if (mips_debug) |
| 3307 | fprintf_unfiltered (gdb_stdlog, " -- partial=%d", |
| 3308 | partial_len); |
| 3309 | |
| 3310 | /* Write this portion of the argument to the stack. */ |
| 3311 | if (argreg > MIPS_LAST_ARG_REGNUM |
| 3312 | || odd_sized_struct |
| 3313 | || fp_register_arg_p (typecode, arg_type)) |
| 3314 | { |
| 3315 | /* Should shorter than int integer values be |
| 3316 | promoted to int before being stored? */ |
| 3317 | int longword_offset = 0; |
| 3318 | CORE_ADDR addr; |
| 3319 | stack_used_p = 1; |
| 3320 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 3321 | { |
| 3322 | if (mips_stack_argsize (gdbarch) == 8 |
| 3323 | && (typecode == TYPE_CODE_INT |
| 3324 | || typecode == TYPE_CODE_PTR |
| 3325 | || typecode == TYPE_CODE_FLT) && len <= 4) |
| 3326 | longword_offset = mips_stack_argsize (gdbarch) - len; |
| 3327 | else if ((typecode == TYPE_CODE_STRUCT |
| 3328 | || typecode == TYPE_CODE_UNION) |
| 3329 | && (TYPE_LENGTH (arg_type) |
| 3330 | < mips_stack_argsize (gdbarch))) |
| 3331 | longword_offset = mips_stack_argsize (gdbarch) - len; |
| 3332 | } |
| 3333 | |
| 3334 | if (mips_debug) |
| 3335 | { |
| 3336 | fprintf_unfiltered (gdb_stdlog, " - stack_offset=0x%s", |
| 3337 | paddr_nz (stack_offset)); |
| 3338 | fprintf_unfiltered (gdb_stdlog, " longword_offset=0x%s", |
| 3339 | paddr_nz (longword_offset)); |
| 3340 | } |
| 3341 | |
| 3342 | addr = sp + stack_offset + longword_offset; |
| 3343 | |
| 3344 | if (mips_debug) |
| 3345 | { |
| 3346 | int i; |
| 3347 | fprintf_unfiltered (gdb_stdlog, " @0x%s ", |
| 3348 | paddr_nz (addr)); |
| 3349 | for (i = 0; i < partial_len; i++) |
| 3350 | { |
| 3351 | fprintf_unfiltered (gdb_stdlog, "%02x", |
| 3352 | val[i] & 0xff); |
| 3353 | } |
| 3354 | } |
| 3355 | write_memory (addr, val, partial_len); |
| 3356 | } |
| 3357 | |
| 3358 | /* Note!!! This is NOT an else clause. Odd sized |
| 3359 | structs may go thru BOTH paths. Floating point |
| 3360 | arguments will not. */ |
| 3361 | /* Write this portion of the argument to a general |
| 3362 | purpose register. */ |
| 3363 | if (argreg <= MIPS_LAST_ARG_REGNUM |
| 3364 | && !fp_register_arg_p (typecode, arg_type)) |
| 3365 | { |
| 3366 | LONGEST regval = |
| 3367 | extract_unsigned_integer (val, partial_len); |
| 3368 | |
| 3369 | if (mips_debug) |
| 3370 | fprintf_filtered (gdb_stdlog, " - reg=%d val=%s", |
| 3371 | argreg, |
| 3372 | phex (regval, |
| 3373 | mips_abi_regsize (gdbarch))); |
| 3374 | write_register (argreg, regval); |
| 3375 | argreg++; |
| 3376 | } |
| 3377 | |
| 3378 | len -= partial_len; |
| 3379 | val += partial_len; |
| 3380 | |
| 3381 | /* Compute the the offset into the stack at which we |
| 3382 | will copy the next parameter. |
| 3383 | |
| 3384 | In the new EABI (and the NABI32), the stack_offset |
| 3385 | only needs to be adjusted when it has been used. */ |
| 3386 | |
| 3387 | if (stack_used_p) |
| 3388 | stack_offset += align_up (partial_len, |
| 3389 | mips_stack_argsize (gdbarch)); |
| 3390 | } |
| 3391 | } |
| 3392 | if (mips_debug) |
| 3393 | fprintf_unfiltered (gdb_stdlog, "\n"); |
| 3394 | } |
| 3395 | |
| 3396 | regcache_cooked_write_signed (regcache, MIPS_SP_REGNUM, sp); |
| 3397 | |
| 3398 | /* Return adjusted stack pointer. */ |
| 3399 | return sp; |
| 3400 | } |
| 3401 | |
| 3402 | /* Given a return value in `regbuf' with a type `valtype', extract and |
| 3403 | copy its value into `valbuf'. */ |
| 3404 | |
| 3405 | static void |
| 3406 | mips_eabi_extract_return_value (struct type *valtype, |
| 3407 | char regbuf[], char *valbuf) |
| 3408 | { |
| 3409 | struct return_value_word lo; |
| 3410 | struct return_value_word hi; |
| 3411 | return_value_location (valtype, &hi, &lo); |
| 3412 | |
| 3413 | memcpy (valbuf + lo.buf_offset, |
| 3414 | regbuf + DEPRECATED_REGISTER_BYTE (NUM_REGS + lo.reg) + |
| 3415 | lo.reg_offset, lo.len); |
| 3416 | |
| 3417 | if (hi.len > 0) |
| 3418 | memcpy (valbuf + hi.buf_offset, |
| 3419 | regbuf + DEPRECATED_REGISTER_BYTE (NUM_REGS + hi.reg) + |
| 3420 | hi.reg_offset, hi.len); |
| 3421 | } |
| 3422 | |
| 3423 | /* Given a return value in `valbuf' with a type `valtype', write it's |
| 3424 | value into the appropriate register. */ |
| 3425 | |
| 3426 | static void |
| 3427 | mips_eabi_store_return_value (struct type *valtype, char *valbuf) |
| 3428 | { |
| 3429 | char raw_buffer[MAX_REGISTER_SIZE]; |
| 3430 | struct return_value_word lo; |
| 3431 | struct return_value_word hi; |
| 3432 | return_value_location (valtype, &hi, &lo); |
| 3433 | |
| 3434 | memset (raw_buffer, 0, sizeof (raw_buffer)); |
| 3435 | memcpy (raw_buffer + lo.reg_offset, valbuf + lo.buf_offset, lo.len); |
| 3436 | deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (lo.reg), |
| 3437 | raw_buffer, register_size (current_gdbarch, |
| 3438 | lo.reg)); |
| 3439 | |
| 3440 | if (hi.len > 0) |
| 3441 | { |
| 3442 | memset (raw_buffer, 0, sizeof (raw_buffer)); |
| 3443 | memcpy (raw_buffer + hi.reg_offset, valbuf + hi.buf_offset, hi.len); |
| 3444 | deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (hi.reg), |
| 3445 | raw_buffer, |
| 3446 | register_size (current_gdbarch, |
| 3447 | hi.reg)); |
| 3448 | } |
| 3449 | } |
| 3450 | |
| 3451 | /* N32/N64 ABI stuff. */ |
| 3452 | |
| 3453 | static CORE_ADDR |
| 3454 | mips_n32n64_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
| 3455 | struct regcache *regcache, CORE_ADDR bp_addr, |
| 3456 | int nargs, struct value **args, CORE_ADDR sp, |
| 3457 | int struct_return, CORE_ADDR struct_addr) |
| 3458 | { |
| 3459 | int argreg; |
| 3460 | int float_argreg; |
| 3461 | int argnum; |
| 3462 | int len = 0; |
| 3463 | int stack_offset = 0; |
| 3464 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 3465 | CORE_ADDR func_addr = find_function_addr (function, NULL); |
| 3466 | |
| 3467 | /* For shared libraries, "t9" needs to point at the function |
| 3468 | address. */ |
| 3469 | regcache_cooked_write_signed (regcache, T9_REGNUM, func_addr); |
| 3470 | |
| 3471 | /* Set the return address register to point to the entry point of |
| 3472 | the program, where a breakpoint lies in wait. */ |
| 3473 | regcache_cooked_write_signed (regcache, RA_REGNUM, bp_addr); |
| 3474 | |
| 3475 | /* First ensure that the stack and structure return address (if any) |
| 3476 | are properly aligned. The stack has to be at least 64-bit |
| 3477 | aligned even on 32-bit machines, because doubles must be 64-bit |
| 3478 | aligned. For n32 and n64, stack frames need to be 128-bit |
| 3479 | aligned, so we round to this widest known alignment. */ |
| 3480 | |
| 3481 | sp = align_down (sp, 16); |
| 3482 | struct_addr = align_down (struct_addr, 16); |
| 3483 | |
| 3484 | /* Now make space on the stack for the args. */ |
| 3485 | for (argnum = 0; argnum < nargs; argnum++) |
| 3486 | len += align_up (TYPE_LENGTH (VALUE_TYPE (args[argnum])), |
| 3487 | mips_stack_argsize (gdbarch)); |
| 3488 | sp -= align_up (len, 16); |
| 3489 | |
| 3490 | if (mips_debug) |
| 3491 | fprintf_unfiltered (gdb_stdlog, |
| 3492 | "mips_n32n64_push_dummy_call: sp=0x%s allocated %ld\n", |
| 3493 | paddr_nz (sp), (long) align_up (len, 16)); |
| 3494 | |
| 3495 | /* Initialize the integer and float register pointers. */ |
| 3496 | argreg = A0_REGNUM; |
| 3497 | float_argreg = mips_fpa0_regnum (current_gdbarch); |
| 3498 | |
| 3499 | /* The struct_return pointer occupies the first parameter-passing reg. */ |
| 3500 | if (struct_return) |
| 3501 | { |
| 3502 | if (mips_debug) |
| 3503 | fprintf_unfiltered (gdb_stdlog, |
| 3504 | "mips_n32n64_push_dummy_call: struct_return reg=%d 0x%s\n", |
| 3505 | argreg, paddr_nz (struct_addr)); |
| 3506 | write_register (argreg++, struct_addr); |
| 3507 | } |
| 3508 | |
| 3509 | /* Now load as many as possible of the first arguments into |
| 3510 | registers, and push the rest onto the stack. Loop thru args |
| 3511 | from first to last. */ |
| 3512 | for (argnum = 0; argnum < nargs; argnum++) |
| 3513 | { |
| 3514 | char *val; |
| 3515 | struct value *arg = args[argnum]; |
| 3516 | struct type *arg_type = check_typedef (VALUE_TYPE (arg)); |
| 3517 | int len = TYPE_LENGTH (arg_type); |
| 3518 | enum type_code typecode = TYPE_CODE (arg_type); |
| 3519 | |
| 3520 | if (mips_debug) |
| 3521 | fprintf_unfiltered (gdb_stdlog, |
| 3522 | "mips_n32n64_push_dummy_call: %d len=%d type=%d", |
| 3523 | argnum + 1, len, (int) typecode); |
| 3524 | |
| 3525 | val = (char *) VALUE_CONTENTS (arg); |
| 3526 | |
| 3527 | if (fp_register_arg_p (typecode, arg_type) |
| 3528 | && float_argreg <= MIPS_LAST_FP_ARG_REGNUM) |
| 3529 | { |
| 3530 | /* This is a floating point value that fits entirely |
| 3531 | in a single register. */ |
| 3532 | /* On 32 bit ABI's the float_argreg is further adjusted |
| 3533 | above to ensure that it is even register aligned. */ |
| 3534 | LONGEST regval = extract_unsigned_integer (val, len); |
| 3535 | if (mips_debug) |
| 3536 | fprintf_unfiltered (gdb_stdlog, " - fpreg=%d val=%s", |
| 3537 | float_argreg, phex (regval, len)); |
| 3538 | write_register (float_argreg++, regval); |
| 3539 | |
| 3540 | if (mips_debug) |
| 3541 | fprintf_unfiltered (gdb_stdlog, " - reg=%d val=%s", |
| 3542 | argreg, phex (regval, len)); |
| 3543 | write_register (argreg, regval); |
| 3544 | argreg += 1; |
| 3545 | } |
| 3546 | else |
| 3547 | { |
| 3548 | /* Copy the argument to general registers or the stack in |
| 3549 | register-sized pieces. Large arguments are split between |
| 3550 | registers and stack. */ |
| 3551 | /* Note: structs whose size is not a multiple of |
| 3552 | mips_abi_regsize() are treated specially: Irix cc passes |
| 3553 | them in registers where gcc sometimes puts them on the |
| 3554 | stack. For maximum compatibility, we will put them in |
| 3555 | both places. */ |
| 3556 | int odd_sized_struct = ((len > mips_abi_regsize (gdbarch)) |
| 3557 | && (len % mips_abi_regsize (gdbarch) != 0)); |
| 3558 | /* Note: Floating-point values that didn't fit into an FP |
| 3559 | register are only written to memory. */ |
| 3560 | while (len > 0) |
| 3561 | { |
| 3562 | /* Rememer if the argument was written to the stack. */ |
| 3563 | int stack_used_p = 0; |
| 3564 | int partial_len = (len < mips_abi_regsize (gdbarch) |
| 3565 | ? len : mips_abi_regsize (gdbarch)); |
| 3566 | |
| 3567 | if (mips_debug) |
| 3568 | fprintf_unfiltered (gdb_stdlog, " -- partial=%d", |
| 3569 | partial_len); |
| 3570 | |
| 3571 | /* Write this portion of the argument to the stack. */ |
| 3572 | if (argreg > MIPS_LAST_ARG_REGNUM |
| 3573 | || odd_sized_struct |
| 3574 | || fp_register_arg_p (typecode, arg_type)) |
| 3575 | { |
| 3576 | /* Should shorter than int integer values be |
| 3577 | promoted to int before being stored? */ |
| 3578 | int longword_offset = 0; |
| 3579 | CORE_ADDR addr; |
| 3580 | stack_used_p = 1; |
| 3581 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 3582 | { |
| 3583 | if (mips_stack_argsize (gdbarch) == 8 |
| 3584 | && (typecode == TYPE_CODE_INT |
| 3585 | || typecode == TYPE_CODE_PTR |
| 3586 | || typecode == TYPE_CODE_FLT) && len <= 4) |
| 3587 | longword_offset = mips_stack_argsize (gdbarch) - len; |
| 3588 | } |
| 3589 | |
| 3590 | if (mips_debug) |
| 3591 | { |
| 3592 | fprintf_unfiltered (gdb_stdlog, " - stack_offset=0x%s", |
| 3593 | paddr_nz (stack_offset)); |
| 3594 | fprintf_unfiltered (gdb_stdlog, " longword_offset=0x%s", |
| 3595 | paddr_nz (longword_offset)); |
| 3596 | } |
| 3597 | |
| 3598 | addr = sp + stack_offset + longword_offset; |
| 3599 | |
| 3600 | if (mips_debug) |
| 3601 | { |
| 3602 | int i; |
| 3603 | fprintf_unfiltered (gdb_stdlog, " @0x%s ", |
| 3604 | paddr_nz (addr)); |
| 3605 | for (i = 0; i < partial_len; i++) |
| 3606 | { |
| 3607 | fprintf_unfiltered (gdb_stdlog, "%02x", |
| 3608 | val[i] & 0xff); |
| 3609 | } |
| 3610 | } |
| 3611 | write_memory (addr, val, partial_len); |
| 3612 | } |
| 3613 | |
| 3614 | /* Note!!! This is NOT an else clause. Odd sized |
| 3615 | structs may go thru BOTH paths. Floating point |
| 3616 | arguments will not. */ |
| 3617 | /* Write this portion of the argument to a general |
| 3618 | purpose register. */ |
| 3619 | if (argreg <= MIPS_LAST_ARG_REGNUM |
| 3620 | && !fp_register_arg_p (typecode, arg_type)) |
| 3621 | { |
| 3622 | LONGEST regval = |
| 3623 | extract_unsigned_integer (val, partial_len); |
| 3624 | |
| 3625 | /* A non-floating-point argument being passed in a |
| 3626 | general register. If a struct or union, and if |
| 3627 | the remaining length is smaller than the register |
| 3628 | size, we have to adjust the register value on |
| 3629 | big endian targets. |
| 3630 | |
| 3631 | It does not seem to be necessary to do the |
| 3632 | same for integral types. |
| 3633 | |
| 3634 | cagney/2001-07-23: gdb/179: Also, GCC, when |
| 3635 | outputting LE O32 with sizeof (struct) < |
| 3636 | mips_abi_regsize(), generates a left shift as |
| 3637 | part of storing the argument in a register a |
| 3638 | register (the left shift isn't generated when |
| 3639 | sizeof (struct) >= mips_abi_regsize()). Since |
| 3640 | it is quite possible that this is GCC |
| 3641 | contradicting the LE/O32 ABI, GDB has not been |
| 3642 | adjusted to accommodate this. Either someone |
| 3643 | needs to demonstrate that the LE/O32 ABI |
| 3644 | specifies such a left shift OR this new ABI gets |
| 3645 | identified as such and GDB gets tweaked |
| 3646 | accordingly. */ |
| 3647 | |
| 3648 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG |
| 3649 | && partial_len < mips_abi_regsize (gdbarch) |
| 3650 | && (typecode == TYPE_CODE_STRUCT || |
| 3651 | typecode == TYPE_CODE_UNION)) |
| 3652 | regval <<= ((mips_abi_regsize (gdbarch) - partial_len) * |
| 3653 | TARGET_CHAR_BIT); |
| 3654 | |
| 3655 | if (mips_debug) |
| 3656 | fprintf_filtered (gdb_stdlog, " - reg=%d val=%s", |
| 3657 | argreg, |
| 3658 | phex (regval, |
| 3659 | mips_abi_regsize (gdbarch))); |
| 3660 | write_register (argreg, regval); |
| 3661 | argreg++; |
| 3662 | } |
| 3663 | |
| 3664 | len -= partial_len; |
| 3665 | val += partial_len; |
| 3666 | |
| 3667 | /* Compute the the offset into the stack at which we |
| 3668 | will copy the next parameter. |
| 3669 | |
| 3670 | In N32 (N64?), the stack_offset only needs to be |
| 3671 | adjusted when it has been used. */ |
| 3672 | |
| 3673 | if (stack_used_p) |
| 3674 | stack_offset += align_up (partial_len, |
| 3675 | mips_stack_argsize (gdbarch)); |
| 3676 | } |
| 3677 | } |
| 3678 | if (mips_debug) |
| 3679 | fprintf_unfiltered (gdb_stdlog, "\n"); |
| 3680 | } |
| 3681 | |
| 3682 | regcache_cooked_write_signed (regcache, MIPS_SP_REGNUM, sp); |
| 3683 | |
| 3684 | /* Return adjusted stack pointer. */ |
| 3685 | return sp; |
| 3686 | } |
| 3687 | |
| 3688 | static enum return_value_convention |
| 3689 | mips_n32n64_return_value (struct gdbarch *gdbarch, |
| 3690 | struct type *type, struct regcache *regcache, |
| 3691 | void *readbuf, const void *writebuf) |
| 3692 | { |
| 3693 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 3694 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 3695 | || TYPE_CODE (type) == TYPE_CODE_UNION |
| 3696 | || TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 3697 | || TYPE_LENGTH (type) > 2 * mips_abi_regsize (gdbarch)) |
| 3698 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 3699 | else if (TYPE_CODE (type) == TYPE_CODE_FLT |
| 3700 | && tdep->mips_fpu_type != MIPS_FPU_NONE) |
| 3701 | { |
| 3702 | /* A floating-point value belongs in the least significant part |
| 3703 | of FP0. */ |
| 3704 | if (mips_debug) |
| 3705 | fprintf_unfiltered (gdb_stderr, "Return float in $fp0\n"); |
| 3706 | mips_xfer_register (regcache, |
| 3707 | NUM_REGS + mips_regnum (current_gdbarch)->fp0, |
| 3708 | TYPE_LENGTH (type), |
| 3709 | TARGET_BYTE_ORDER, readbuf, writebuf, 0); |
| 3710 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 3711 | } |
| 3712 | else if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 3713 | && TYPE_NFIELDS (type) <= 2 |
| 3714 | && TYPE_NFIELDS (type) >= 1 |
| 3715 | && ((TYPE_NFIELDS (type) == 1 |
| 3716 | && (TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) |
| 3717 | == TYPE_CODE_FLT)) |
| 3718 | || (TYPE_NFIELDS (type) == 2 |
| 3719 | && (TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) |
| 3720 | == TYPE_CODE_FLT) |
| 3721 | && (TYPE_CODE (TYPE_FIELD_TYPE (type, 1)) |
| 3722 | == TYPE_CODE_FLT))) |
| 3723 | && tdep->mips_fpu_type != MIPS_FPU_NONE) |
| 3724 | { |
| 3725 | /* A struct that contains one or two floats. Each value is part |
| 3726 | in the least significant part of their floating point |
| 3727 | register.. */ |
| 3728 | int regnum; |
| 3729 | int field; |
| 3730 | for (field = 0, regnum = mips_regnum (current_gdbarch)->fp0; |
| 3731 | field < TYPE_NFIELDS (type); field++, regnum += 2) |
| 3732 | { |
| 3733 | int offset = (FIELD_BITPOS (TYPE_FIELDS (type)[field]) |
| 3734 | / TARGET_CHAR_BIT); |
| 3735 | if (mips_debug) |
| 3736 | fprintf_unfiltered (gdb_stderr, "Return float struct+%d\n", |
| 3737 | offset); |
| 3738 | mips_xfer_register (regcache, NUM_REGS + regnum, |
| 3739 | TYPE_LENGTH (TYPE_FIELD_TYPE (type, field)), |
| 3740 | TARGET_BYTE_ORDER, readbuf, writebuf, offset); |
| 3741 | } |
| 3742 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 3743 | } |
| 3744 | else if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 3745 | || TYPE_CODE (type) == TYPE_CODE_UNION) |
| 3746 | { |
| 3747 | /* A structure or union. Extract the left justified value, |
| 3748 | regardless of the byte order. I.e. DO NOT USE |
| 3749 | mips_xfer_lower. */ |
| 3750 | int offset; |
| 3751 | int regnum; |
| 3752 | for (offset = 0, regnum = V0_REGNUM; |
| 3753 | offset < TYPE_LENGTH (type); |
| 3754 | offset += register_size (current_gdbarch, regnum), regnum++) |
| 3755 | { |
| 3756 | int xfer = register_size (current_gdbarch, regnum); |
| 3757 | if (offset + xfer > TYPE_LENGTH (type)) |
| 3758 | xfer = TYPE_LENGTH (type) - offset; |
| 3759 | if (mips_debug) |
| 3760 | fprintf_unfiltered (gdb_stderr, "Return struct+%d:%d in $%d\n", |
| 3761 | offset, xfer, regnum); |
| 3762 | mips_xfer_register (regcache, NUM_REGS + regnum, xfer, |
| 3763 | BFD_ENDIAN_UNKNOWN, readbuf, writebuf, offset); |
| 3764 | } |
| 3765 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 3766 | } |
| 3767 | else |
| 3768 | { |
| 3769 | /* A scalar extract each part but least-significant-byte |
| 3770 | justified. */ |
| 3771 | int offset; |
| 3772 | int regnum; |
| 3773 | for (offset = 0, regnum = V0_REGNUM; |
| 3774 | offset < TYPE_LENGTH (type); |
| 3775 | offset += register_size (current_gdbarch, regnum), regnum++) |
| 3776 | { |
| 3777 | int xfer = register_size (current_gdbarch, regnum); |
| 3778 | if (offset + xfer > TYPE_LENGTH (type)) |
| 3779 | xfer = TYPE_LENGTH (type) - offset; |
| 3780 | if (mips_debug) |
| 3781 | fprintf_unfiltered (gdb_stderr, "Return scalar+%d:%d in $%d\n", |
| 3782 | offset, xfer, regnum); |
| 3783 | mips_xfer_register (regcache, NUM_REGS + regnum, xfer, |
| 3784 | TARGET_BYTE_ORDER, readbuf, writebuf, offset); |
| 3785 | } |
| 3786 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 3787 | } |
| 3788 | } |
| 3789 | |
| 3790 | /* O32 ABI stuff. */ |
| 3791 | |
| 3792 | static CORE_ADDR |
| 3793 | mips_o32_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
| 3794 | struct regcache *regcache, CORE_ADDR bp_addr, |
| 3795 | int nargs, struct value **args, CORE_ADDR sp, |
| 3796 | int struct_return, CORE_ADDR struct_addr) |
| 3797 | { |
| 3798 | int argreg; |
| 3799 | int float_argreg; |
| 3800 | int argnum; |
| 3801 | int len = 0; |
| 3802 | int stack_offset = 0; |
| 3803 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 3804 | CORE_ADDR func_addr = find_function_addr (function, NULL); |
| 3805 | |
| 3806 | /* For shared libraries, "t9" needs to point at the function |
| 3807 | address. */ |
| 3808 | regcache_cooked_write_signed (regcache, T9_REGNUM, func_addr); |
| 3809 | |
| 3810 | /* Set the return address register to point to the entry point of |
| 3811 | the program, where a breakpoint lies in wait. */ |
| 3812 | regcache_cooked_write_signed (regcache, RA_REGNUM, bp_addr); |
| 3813 | |
| 3814 | /* First ensure that the stack and structure return address (if any) |
| 3815 | are properly aligned. The stack has to be at least 64-bit |
| 3816 | aligned even on 32-bit machines, because doubles must be 64-bit |
| 3817 | aligned. For n32 and n64, stack frames need to be 128-bit |
| 3818 | aligned, so we round to this widest known alignment. */ |
| 3819 | |
| 3820 | sp = align_down (sp, 16); |
| 3821 | struct_addr = align_down (struct_addr, 16); |
| 3822 | |
| 3823 | /* Now make space on the stack for the args. */ |
| 3824 | for (argnum = 0; argnum < nargs; argnum++) |
| 3825 | len += align_up (TYPE_LENGTH (VALUE_TYPE (args[argnum])), |
| 3826 | mips_stack_argsize (gdbarch)); |
| 3827 | sp -= align_up (len, 16); |
| 3828 | |
| 3829 | if (mips_debug) |
| 3830 | fprintf_unfiltered (gdb_stdlog, |
| 3831 | "mips_o32_push_dummy_call: sp=0x%s allocated %ld\n", |
| 3832 | paddr_nz (sp), (long) align_up (len, 16)); |
| 3833 | |
| 3834 | /* Initialize the integer and float register pointers. */ |
| 3835 | argreg = A0_REGNUM; |
| 3836 | float_argreg = mips_fpa0_regnum (current_gdbarch); |
| 3837 | |
| 3838 | /* The struct_return pointer occupies the first parameter-passing reg. */ |
| 3839 | if (struct_return) |
| 3840 | { |
| 3841 | if (mips_debug) |
| 3842 | fprintf_unfiltered (gdb_stdlog, |
| 3843 | "mips_o32_push_dummy_call: struct_return reg=%d 0x%s\n", |
| 3844 | argreg, paddr_nz (struct_addr)); |
| 3845 | write_register (argreg++, struct_addr); |
| 3846 | stack_offset += mips_stack_argsize (gdbarch); |
| 3847 | } |
| 3848 | |
| 3849 | /* Now load as many as possible of the first arguments into |
| 3850 | registers, and push the rest onto the stack. Loop thru args |
| 3851 | from first to last. */ |
| 3852 | for (argnum = 0; argnum < nargs; argnum++) |
| 3853 | { |
| 3854 | char *val; |
| 3855 | struct value *arg = args[argnum]; |
| 3856 | struct type *arg_type = check_typedef (VALUE_TYPE (arg)); |
| 3857 | int len = TYPE_LENGTH (arg_type); |
| 3858 | enum type_code typecode = TYPE_CODE (arg_type); |
| 3859 | |
| 3860 | if (mips_debug) |
| 3861 | fprintf_unfiltered (gdb_stdlog, |
| 3862 | "mips_o32_push_dummy_call: %d len=%d type=%d", |
| 3863 | argnum + 1, len, (int) typecode); |
| 3864 | |
| 3865 | val = (char *) VALUE_CONTENTS (arg); |
| 3866 | |
| 3867 | /* 32-bit ABIs always start floating point arguments in an |
| 3868 | even-numbered floating point register. Round the FP register |
| 3869 | up before the check to see if there are any FP registers |
| 3870 | left. O32/O64 targets also pass the FP in the integer |
| 3871 | registers so also round up normal registers. */ |
| 3872 | if (mips_abi_regsize (gdbarch) < 8 |
| 3873 | && fp_register_arg_p (typecode, arg_type)) |
| 3874 | { |
| 3875 | if ((float_argreg & 1)) |
| 3876 | float_argreg++; |
| 3877 | } |
| 3878 | |
| 3879 | /* Floating point arguments passed in registers have to be |
| 3880 | treated specially. On 32-bit architectures, doubles |
| 3881 | are passed in register pairs; the even register gets |
| 3882 | the low word, and the odd register gets the high word. |
| 3883 | On O32/O64, the first two floating point arguments are |
| 3884 | also copied to general registers, because MIPS16 functions |
| 3885 | don't use float registers for arguments. This duplication of |
| 3886 | arguments in general registers can't hurt non-MIPS16 functions |
| 3887 | because those registers are normally skipped. */ |
| 3888 | |
| 3889 | if (fp_register_arg_p (typecode, arg_type) |
| 3890 | && float_argreg <= MIPS_LAST_FP_ARG_REGNUM) |
| 3891 | { |
| 3892 | if (mips_abi_regsize (gdbarch) < 8 && len == 8) |
| 3893 | { |
| 3894 | int low_offset = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? 4 : 0; |
| 3895 | unsigned long regval; |
| 3896 | |
| 3897 | /* Write the low word of the double to the even register(s). */ |
| 3898 | regval = extract_unsigned_integer (val + low_offset, 4); |
| 3899 | if (mips_debug) |
| 3900 | fprintf_unfiltered (gdb_stdlog, " - fpreg=%d val=%s", |
| 3901 | float_argreg, phex (regval, 4)); |
| 3902 | write_register (float_argreg++, regval); |
| 3903 | if (mips_debug) |
| 3904 | fprintf_unfiltered (gdb_stdlog, " - reg=%d val=%s", |
| 3905 | argreg, phex (regval, 4)); |
| 3906 | write_register (argreg++, regval); |
| 3907 | |
| 3908 | /* Write the high word of the double to the odd register(s). */ |
| 3909 | regval = extract_unsigned_integer (val + 4 - low_offset, 4); |
| 3910 | if (mips_debug) |
| 3911 | fprintf_unfiltered (gdb_stdlog, " - fpreg=%d val=%s", |
| 3912 | float_argreg, phex (regval, 4)); |
| 3913 | write_register (float_argreg++, regval); |
| 3914 | |
| 3915 | if (mips_debug) |
| 3916 | fprintf_unfiltered (gdb_stdlog, " - reg=%d val=%s", |
| 3917 | argreg, phex (regval, 4)); |
| 3918 | write_register (argreg++, regval); |
| 3919 | } |
| 3920 | else |
| 3921 | { |
| 3922 | /* This is a floating point value that fits entirely |
| 3923 | in a single register. */ |
| 3924 | /* On 32 bit ABI's the float_argreg is further adjusted |
| 3925 | above to ensure that it is even register aligned. */ |
| 3926 | LONGEST regval = extract_unsigned_integer (val, len); |
| 3927 | if (mips_debug) |
| 3928 | fprintf_unfiltered (gdb_stdlog, " - fpreg=%d val=%s", |
| 3929 | float_argreg, phex (regval, len)); |
| 3930 | write_register (float_argreg++, regval); |
| 3931 | /* CAGNEY: 32 bit MIPS ABI's always reserve two FP |
| 3932 | registers for each argument. The below is (my |
| 3933 | guess) to ensure that the corresponding integer |
| 3934 | register has reserved the same space. */ |
| 3935 | if (mips_debug) |
| 3936 | fprintf_unfiltered (gdb_stdlog, " - reg=%d val=%s", |
| 3937 | argreg, phex (regval, len)); |
| 3938 | write_register (argreg, regval); |
| 3939 | argreg += (mips_abi_regsize (gdbarch) == 8) ? 1 : 2; |
| 3940 | } |
| 3941 | /* Reserve space for the FP register. */ |
| 3942 | stack_offset += align_up (len, mips_stack_argsize (gdbarch)); |
| 3943 | } |
| 3944 | else |
| 3945 | { |
| 3946 | /* Copy the argument to general registers or the stack in |
| 3947 | register-sized pieces. Large arguments are split between |
| 3948 | registers and stack. */ |
| 3949 | /* Note: structs whose size is not a multiple of |
| 3950 | mips_abi_regsize() are treated specially: Irix cc passes |
| 3951 | them in registers where gcc sometimes puts them on the |
| 3952 | stack. For maximum compatibility, we will put them in |
| 3953 | both places. */ |
| 3954 | int odd_sized_struct = ((len > mips_abi_regsize (gdbarch)) |
| 3955 | && (len % mips_abi_regsize (gdbarch) != 0)); |
| 3956 | /* Structures should be aligned to eight bytes (even arg registers) |
| 3957 | on MIPS_ABI_O32, if their first member has double precision. */ |
| 3958 | if (mips_abi_regsize (gdbarch) < 8 |
| 3959 | && mips_type_needs_double_align (arg_type)) |
| 3960 | { |
| 3961 | if ((argreg & 1)) |
| 3962 | argreg++; |
| 3963 | } |
| 3964 | /* Note: Floating-point values that didn't fit into an FP |
| 3965 | register are only written to memory. */ |
| 3966 | while (len > 0) |
| 3967 | { |
| 3968 | /* Remember if the argument was written to the stack. */ |
| 3969 | int stack_used_p = 0; |
| 3970 | int partial_len = (len < mips_abi_regsize (gdbarch) |
| 3971 | ? len : mips_abi_regsize (gdbarch)); |
| 3972 | |
| 3973 | if (mips_debug) |
| 3974 | fprintf_unfiltered (gdb_stdlog, " -- partial=%d", |
| 3975 | partial_len); |
| 3976 | |
| 3977 | /* Write this portion of the argument to the stack. */ |
| 3978 | if (argreg > MIPS_LAST_ARG_REGNUM |
| 3979 | || odd_sized_struct |
| 3980 | || fp_register_arg_p (typecode, arg_type)) |
| 3981 | { |
| 3982 | /* Should shorter than int integer values be |
| 3983 | promoted to int before being stored? */ |
| 3984 | int longword_offset = 0; |
| 3985 | CORE_ADDR addr; |
| 3986 | stack_used_p = 1; |
| 3987 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 3988 | { |
| 3989 | if (mips_stack_argsize (gdbarch) == 8 |
| 3990 | && (typecode == TYPE_CODE_INT |
| 3991 | || typecode == TYPE_CODE_PTR |
| 3992 | || typecode == TYPE_CODE_FLT) && len <= 4) |
| 3993 | longword_offset = mips_stack_argsize (gdbarch) - len; |
| 3994 | } |
| 3995 | |
| 3996 | if (mips_debug) |
| 3997 | { |
| 3998 | fprintf_unfiltered (gdb_stdlog, " - stack_offset=0x%s", |
| 3999 | paddr_nz (stack_offset)); |
| 4000 | fprintf_unfiltered (gdb_stdlog, " longword_offset=0x%s", |
| 4001 | paddr_nz (longword_offset)); |
| 4002 | } |
| 4003 | |
| 4004 | addr = sp + stack_offset + longword_offset; |
| 4005 | |
| 4006 | if (mips_debug) |
| 4007 | { |
| 4008 | int i; |
| 4009 | fprintf_unfiltered (gdb_stdlog, " @0x%s ", |
| 4010 | paddr_nz (addr)); |
| 4011 | for (i = 0; i < partial_len; i++) |
| 4012 | { |
| 4013 | fprintf_unfiltered (gdb_stdlog, "%02x", |
| 4014 | val[i] & 0xff); |
| 4015 | } |
| 4016 | } |
| 4017 | write_memory (addr, val, partial_len); |
| 4018 | } |
| 4019 | |
| 4020 | /* Note!!! This is NOT an else clause. Odd sized |
| 4021 | structs may go thru BOTH paths. Floating point |
| 4022 | arguments will not. */ |
| 4023 | /* Write this portion of the argument to a general |
| 4024 | purpose register. */ |
| 4025 | if (argreg <= MIPS_LAST_ARG_REGNUM |
| 4026 | && !fp_register_arg_p (typecode, arg_type)) |
| 4027 | { |
| 4028 | LONGEST regval = extract_signed_integer (val, partial_len); |
| 4029 | /* Value may need to be sign extended, because |
| 4030 | mips_isa_regsize() != mips_abi_regsize(). */ |
| 4031 | |
| 4032 | /* A non-floating-point argument being passed in a |
| 4033 | general register. If a struct or union, and if |
| 4034 | the remaining length is smaller than the register |
| 4035 | size, we have to adjust the register value on |
| 4036 | big endian targets. |
| 4037 | |
| 4038 | It does not seem to be necessary to do the |
| 4039 | same for integral types. |
| 4040 | |
| 4041 | Also don't do this adjustment on O64 binaries. |
| 4042 | |
| 4043 | cagney/2001-07-23: gdb/179: Also, GCC, when |
| 4044 | outputting LE O32 with sizeof (struct) < |
| 4045 | mips_abi_regsize(), generates a left shift as |
| 4046 | part of storing the argument in a register a |
| 4047 | register (the left shift isn't generated when |
| 4048 | sizeof (struct) >= mips_abi_regsize()). Since |
| 4049 | it is quite possible that this is GCC |
| 4050 | contradicting the LE/O32 ABI, GDB has not been |
| 4051 | adjusted to accommodate this. Either someone |
| 4052 | needs to demonstrate that the LE/O32 ABI |
| 4053 | specifies such a left shift OR this new ABI gets |
| 4054 | identified as such and GDB gets tweaked |
| 4055 | accordingly. */ |
| 4056 | |
| 4057 | if (mips_abi_regsize (gdbarch) < 8 |
| 4058 | && TARGET_BYTE_ORDER == BFD_ENDIAN_BIG |
| 4059 | && partial_len < mips_abi_regsize (gdbarch) |
| 4060 | && (typecode == TYPE_CODE_STRUCT || |
| 4061 | typecode == TYPE_CODE_UNION)) |
| 4062 | regval <<= ((mips_abi_regsize (gdbarch) - partial_len) * |
| 4063 | TARGET_CHAR_BIT); |
| 4064 | |
| 4065 | if (mips_debug) |
| 4066 | fprintf_filtered (gdb_stdlog, " - reg=%d val=%s", |
| 4067 | argreg, |
| 4068 | phex (regval, |
| 4069 | mips_abi_regsize (gdbarch))); |
| 4070 | write_register (argreg, regval); |
| 4071 | argreg++; |
| 4072 | |
| 4073 | /* Prevent subsequent floating point arguments from |
| 4074 | being passed in floating point registers. */ |
| 4075 | float_argreg = MIPS_LAST_FP_ARG_REGNUM + 1; |
| 4076 | } |
| 4077 | |
| 4078 | len -= partial_len; |
| 4079 | val += partial_len; |
| 4080 | |
| 4081 | /* Compute the the offset into the stack at which we |
| 4082 | will copy the next parameter. |
| 4083 | |
| 4084 | In older ABIs, the caller reserved space for |
| 4085 | registers that contained arguments. This was loosely |
| 4086 | refered to as their "home". Consequently, space is |
| 4087 | always allocated. */ |
| 4088 | |
| 4089 | stack_offset += align_up (partial_len, |
| 4090 | mips_stack_argsize (gdbarch)); |
| 4091 | } |
| 4092 | } |
| 4093 | if (mips_debug) |
| 4094 | fprintf_unfiltered (gdb_stdlog, "\n"); |
| 4095 | } |
| 4096 | |
| 4097 | regcache_cooked_write_signed (regcache, MIPS_SP_REGNUM, sp); |
| 4098 | |
| 4099 | /* Return adjusted stack pointer. */ |
| 4100 | return sp; |
| 4101 | } |
| 4102 | |
| 4103 | static enum return_value_convention |
| 4104 | mips_o32_return_value (struct gdbarch *gdbarch, struct type *type, |
| 4105 | struct regcache *regcache, |
| 4106 | void *readbuf, const void *writebuf) |
| 4107 | { |
| 4108 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 4109 | |
| 4110 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 4111 | || TYPE_CODE (type) == TYPE_CODE_UNION |
| 4112 | || TYPE_CODE (type) == TYPE_CODE_ARRAY) |
| 4113 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 4114 | else if (TYPE_CODE (type) == TYPE_CODE_FLT |
| 4115 | && TYPE_LENGTH (type) == 4 && tdep->mips_fpu_type != MIPS_FPU_NONE) |
| 4116 | { |
| 4117 | /* A single-precision floating-point value. It fits in the |
| 4118 | least significant part of FP0. */ |
| 4119 | if (mips_debug) |
| 4120 | fprintf_unfiltered (gdb_stderr, "Return float in $fp0\n"); |
| 4121 | mips_xfer_register (regcache, |
| 4122 | NUM_REGS + mips_regnum (current_gdbarch)->fp0, |
| 4123 | TYPE_LENGTH (type), |
| 4124 | TARGET_BYTE_ORDER, readbuf, writebuf, 0); |
| 4125 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 4126 | } |
| 4127 | else if (TYPE_CODE (type) == TYPE_CODE_FLT |
| 4128 | && TYPE_LENGTH (type) == 8 && tdep->mips_fpu_type != MIPS_FPU_NONE) |
| 4129 | { |
| 4130 | /* A double-precision floating-point value. The most |
| 4131 | significant part goes in FP1, and the least significant in |
| 4132 | FP0. */ |
| 4133 | if (mips_debug) |
| 4134 | fprintf_unfiltered (gdb_stderr, "Return float in $fp1/$fp0\n"); |
| 4135 | switch (TARGET_BYTE_ORDER) |
| 4136 | { |
| 4137 | case BFD_ENDIAN_LITTLE: |
| 4138 | mips_xfer_register (regcache, |
| 4139 | NUM_REGS + mips_regnum (current_gdbarch)->fp0 + |
| 4140 | 0, 4, TARGET_BYTE_ORDER, readbuf, writebuf, 0); |
| 4141 | mips_xfer_register (regcache, |
| 4142 | NUM_REGS + mips_regnum (current_gdbarch)->fp0 + |
| 4143 | 1, 4, TARGET_BYTE_ORDER, readbuf, writebuf, 4); |
| 4144 | break; |
| 4145 | case BFD_ENDIAN_BIG: |
| 4146 | mips_xfer_register (regcache, |
| 4147 | NUM_REGS + mips_regnum (current_gdbarch)->fp0 + |
| 4148 | 1, 4, TARGET_BYTE_ORDER, readbuf, writebuf, 0); |
| 4149 | mips_xfer_register (regcache, |
| 4150 | NUM_REGS + mips_regnum (current_gdbarch)->fp0 + |
| 4151 | 0, 4, TARGET_BYTE_ORDER, readbuf, writebuf, 4); |
| 4152 | break; |
| 4153 | default: |
| 4154 | internal_error (__FILE__, __LINE__, "bad switch"); |
| 4155 | } |
| 4156 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 4157 | } |
| 4158 | #if 0 |
| 4159 | else if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 4160 | && TYPE_NFIELDS (type) <= 2 |
| 4161 | && TYPE_NFIELDS (type) >= 1 |
| 4162 | && ((TYPE_NFIELDS (type) == 1 |
| 4163 | && (TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) |
| 4164 | == TYPE_CODE_FLT)) |
| 4165 | || (TYPE_NFIELDS (type) == 2 |
| 4166 | && (TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) |
| 4167 | == TYPE_CODE_FLT) |
| 4168 | && (TYPE_CODE (TYPE_FIELD_TYPE (type, 1)) |
| 4169 | == TYPE_CODE_FLT))) |
| 4170 | && tdep->mips_fpu_type != MIPS_FPU_NONE) |
| 4171 | { |
| 4172 | /* A struct that contains one or two floats. Each value is part |
| 4173 | in the least significant part of their floating point |
| 4174 | register.. */ |
| 4175 | bfd_byte reg[MAX_REGISTER_SIZE]; |
| 4176 | int regnum; |
| 4177 | int field; |
| 4178 | for (field = 0, regnum = mips_regnum (current_gdbarch)->fp0; |
| 4179 | field < TYPE_NFIELDS (type); field++, regnum += 2) |
| 4180 | { |
| 4181 | int offset = (FIELD_BITPOS (TYPE_FIELDS (type)[field]) |
| 4182 | / TARGET_CHAR_BIT); |
| 4183 | if (mips_debug) |
| 4184 | fprintf_unfiltered (gdb_stderr, "Return float struct+%d\n", |
| 4185 | offset); |
| 4186 | mips_xfer_register (regcache, NUM_REGS + regnum, |
| 4187 | TYPE_LENGTH (TYPE_FIELD_TYPE (type, field)), |
| 4188 | TARGET_BYTE_ORDER, readbuf, writebuf, offset); |
| 4189 | } |
| 4190 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 4191 | } |
| 4192 | #endif |
| 4193 | #if 0 |
| 4194 | else if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 4195 | || TYPE_CODE (type) == TYPE_CODE_UNION) |
| 4196 | { |
| 4197 | /* A structure or union. Extract the left justified value, |
| 4198 | regardless of the byte order. I.e. DO NOT USE |
| 4199 | mips_xfer_lower. */ |
| 4200 | int offset; |
| 4201 | int regnum; |
| 4202 | for (offset = 0, regnum = V0_REGNUM; |
| 4203 | offset < TYPE_LENGTH (type); |
| 4204 | offset += register_size (current_gdbarch, regnum), regnum++) |
| 4205 | { |
| 4206 | int xfer = register_size (current_gdbarch, regnum); |
| 4207 | if (offset + xfer > TYPE_LENGTH (type)) |
| 4208 | xfer = TYPE_LENGTH (type) - offset; |
| 4209 | if (mips_debug) |
| 4210 | fprintf_unfiltered (gdb_stderr, "Return struct+%d:%d in $%d\n", |
| 4211 | offset, xfer, regnum); |
| 4212 | mips_xfer_register (regcache, NUM_REGS + regnum, xfer, |
| 4213 | BFD_ENDIAN_UNKNOWN, readbuf, writebuf, offset); |
| 4214 | } |
| 4215 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 4216 | } |
| 4217 | #endif |
| 4218 | else |
| 4219 | { |
| 4220 | /* A scalar extract each part but least-significant-byte |
| 4221 | justified. o32 thinks registers are 4 byte, regardless of |
| 4222 | the ISA. mips_stack_argsize controls this. */ |
| 4223 | int offset; |
| 4224 | int regnum; |
| 4225 | for (offset = 0, regnum = V0_REGNUM; |
| 4226 | offset < TYPE_LENGTH (type); |
| 4227 | offset += mips_stack_argsize (gdbarch), regnum++) |
| 4228 | { |
| 4229 | int xfer = mips_stack_argsize (gdbarch); |
| 4230 | if (offset + xfer > TYPE_LENGTH (type)) |
| 4231 | xfer = TYPE_LENGTH (type) - offset; |
| 4232 | if (mips_debug) |
| 4233 | fprintf_unfiltered (gdb_stderr, "Return scalar+%d:%d in $%d\n", |
| 4234 | offset, xfer, regnum); |
| 4235 | mips_xfer_register (regcache, NUM_REGS + regnum, xfer, |
| 4236 | TARGET_BYTE_ORDER, readbuf, writebuf, offset); |
| 4237 | } |
| 4238 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 4239 | } |
| 4240 | } |
| 4241 | |
| 4242 | /* O64 ABI. This is a hacked up kind of 64-bit version of the o32 |
| 4243 | ABI. */ |
| 4244 | |
| 4245 | static CORE_ADDR |
| 4246 | mips_o64_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
| 4247 | struct regcache *regcache, CORE_ADDR bp_addr, |
| 4248 | int nargs, |
| 4249 | struct value **args, CORE_ADDR sp, |
| 4250 | int struct_return, CORE_ADDR struct_addr) |
| 4251 | { |
| 4252 | int argreg; |
| 4253 | int float_argreg; |
| 4254 | int argnum; |
| 4255 | int len = 0; |
| 4256 | int stack_offset = 0; |
| 4257 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 4258 | CORE_ADDR func_addr = find_function_addr (function, NULL); |
| 4259 | |
| 4260 | /* For shared libraries, "t9" needs to point at the function |
| 4261 | address. */ |
| 4262 | regcache_cooked_write_signed (regcache, T9_REGNUM, func_addr); |
| 4263 | |
| 4264 | /* Set the return address register to point to the entry point of |
| 4265 | the program, where a breakpoint lies in wait. */ |
| 4266 | regcache_cooked_write_signed (regcache, RA_REGNUM, bp_addr); |
| 4267 | |
| 4268 | /* First ensure that the stack and structure return address (if any) |
| 4269 | are properly aligned. The stack has to be at least 64-bit |
| 4270 | aligned even on 32-bit machines, because doubles must be 64-bit |
| 4271 | aligned. For n32 and n64, stack frames need to be 128-bit |
| 4272 | aligned, so we round to this widest known alignment. */ |
| 4273 | |
| 4274 | sp = align_down (sp, 16); |
| 4275 | struct_addr = align_down (struct_addr, 16); |
| 4276 | |
| 4277 | /* Now make space on the stack for the args. */ |
| 4278 | for (argnum = 0; argnum < nargs; argnum++) |
| 4279 | len += align_up (TYPE_LENGTH (VALUE_TYPE (args[argnum])), |
| 4280 | mips_stack_argsize (gdbarch)); |
| 4281 | sp -= align_up (len, 16); |
| 4282 | |
| 4283 | if (mips_debug) |
| 4284 | fprintf_unfiltered (gdb_stdlog, |
| 4285 | "mips_o64_push_dummy_call: sp=0x%s allocated %ld\n", |
| 4286 | paddr_nz (sp), (long) align_up (len, 16)); |
| 4287 | |
| 4288 | /* Initialize the integer and float register pointers. */ |
| 4289 | argreg = A0_REGNUM; |
| 4290 | float_argreg = mips_fpa0_regnum (current_gdbarch); |
| 4291 | |
| 4292 | /* The struct_return pointer occupies the first parameter-passing reg. */ |
| 4293 | if (struct_return) |
| 4294 | { |
| 4295 | if (mips_debug) |
| 4296 | fprintf_unfiltered (gdb_stdlog, |
| 4297 | "mips_o64_push_dummy_call: struct_return reg=%d 0x%s\n", |
| 4298 | argreg, paddr_nz (struct_addr)); |
| 4299 | write_register (argreg++, struct_addr); |
| 4300 | stack_offset += mips_stack_argsize (gdbarch); |
| 4301 | } |
| 4302 | |
| 4303 | /* Now load as many as possible of the first arguments into |
| 4304 | registers, and push the rest onto the stack. Loop thru args |
| 4305 | from first to last. */ |
| 4306 | for (argnum = 0; argnum < nargs; argnum++) |
| 4307 | { |
| 4308 | char *val; |
| 4309 | struct value *arg = args[argnum]; |
| 4310 | struct type *arg_type = check_typedef (VALUE_TYPE (arg)); |
| 4311 | int len = TYPE_LENGTH (arg_type); |
| 4312 | enum type_code typecode = TYPE_CODE (arg_type); |
| 4313 | |
| 4314 | if (mips_debug) |
| 4315 | fprintf_unfiltered (gdb_stdlog, |
| 4316 | "mips_o64_push_dummy_call: %d len=%d type=%d", |
| 4317 | argnum + 1, len, (int) typecode); |
| 4318 | |
| 4319 | val = (char *) VALUE_CONTENTS (arg); |
| 4320 | |
| 4321 | /* 32-bit ABIs always start floating point arguments in an |
| 4322 | even-numbered floating point register. Round the FP register |
| 4323 | up before the check to see if there are any FP registers |
| 4324 | left. O32/O64 targets also pass the FP in the integer |
| 4325 | registers so also round up normal registers. */ |
| 4326 | if (mips_abi_regsize (gdbarch) < 8 |
| 4327 | && fp_register_arg_p (typecode, arg_type)) |
| 4328 | { |
| 4329 | if ((float_argreg & 1)) |
| 4330 | float_argreg++; |
| 4331 | } |
| 4332 | |
| 4333 | /* Floating point arguments passed in registers have to be |
| 4334 | treated specially. On 32-bit architectures, doubles |
| 4335 | are passed in register pairs; the even register gets |
| 4336 | the low word, and the odd register gets the high word. |
| 4337 | On O32/O64, the first two floating point arguments are |
| 4338 | also copied to general registers, because MIPS16 functions |
| 4339 | don't use float registers for arguments. This duplication of |
| 4340 | arguments in general registers can't hurt non-MIPS16 functions |
| 4341 | because those registers are normally skipped. */ |
| 4342 | |
| 4343 | if (fp_register_arg_p (typecode, arg_type) |
| 4344 | && float_argreg <= MIPS_LAST_FP_ARG_REGNUM) |
| 4345 | { |
| 4346 | if (mips_abi_regsize (gdbarch) < 8 && len == 8) |
| 4347 | { |
| 4348 | int low_offset = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? 4 : 0; |
| 4349 | unsigned long regval; |
| 4350 | |
| 4351 | /* Write the low word of the double to the even register(s). */ |
| 4352 | regval = extract_unsigned_integer (val + low_offset, 4); |
| 4353 | if (mips_debug) |
| 4354 | fprintf_unfiltered (gdb_stdlog, " - fpreg=%d val=%s", |
| 4355 | float_argreg, phex (regval, 4)); |
| 4356 | write_register (float_argreg++, regval); |
| 4357 | if (mips_debug) |
| 4358 | fprintf_unfiltered (gdb_stdlog, " - reg=%d val=%s", |
| 4359 | argreg, phex (regval, 4)); |
| 4360 | write_register (argreg++, regval); |
| 4361 | |
| 4362 | /* Write the high word of the double to the odd register(s). */ |
| 4363 | regval = extract_unsigned_integer (val + 4 - low_offset, 4); |
| 4364 | if (mips_debug) |
| 4365 | fprintf_unfiltered (gdb_stdlog, " - fpreg=%d val=%s", |
| 4366 | float_argreg, phex (regval, 4)); |
| 4367 | write_register (float_argreg++, regval); |
| 4368 | |
| 4369 | if (mips_debug) |
| 4370 | fprintf_unfiltered (gdb_stdlog, " - reg=%d val=%s", |
| 4371 | argreg, phex (regval, 4)); |
| 4372 | write_register (argreg++, regval); |
| 4373 | } |
| 4374 | else |
| 4375 | { |
| 4376 | /* This is a floating point value that fits entirely |
| 4377 | in a single register. */ |
| 4378 | /* On 32 bit ABI's the float_argreg is further adjusted |
| 4379 | above to ensure that it is even register aligned. */ |
| 4380 | LONGEST regval = extract_unsigned_integer (val, len); |
| 4381 | if (mips_debug) |
| 4382 | fprintf_unfiltered (gdb_stdlog, " - fpreg=%d val=%s", |
| 4383 | float_argreg, phex (regval, len)); |
| 4384 | write_register (float_argreg++, regval); |
| 4385 | /* CAGNEY: 32 bit MIPS ABI's always reserve two FP |
| 4386 | registers for each argument. The below is (my |
| 4387 | guess) to ensure that the corresponding integer |
| 4388 | register has reserved the same space. */ |
| 4389 | if (mips_debug) |
| 4390 | fprintf_unfiltered (gdb_stdlog, " - reg=%d val=%s", |
| 4391 | argreg, phex (regval, len)); |
| 4392 | write_register (argreg, regval); |
| 4393 | argreg += (mips_abi_regsize (gdbarch) == 8) ? 1 : 2; |
| 4394 | } |
| 4395 | /* Reserve space for the FP register. */ |
| 4396 | stack_offset += align_up (len, mips_stack_argsize (gdbarch)); |
| 4397 | } |
| 4398 | else |
| 4399 | { |
| 4400 | /* Copy the argument to general registers or the stack in |
| 4401 | register-sized pieces. Large arguments are split between |
| 4402 | registers and stack. */ |
| 4403 | /* Note: structs whose size is not a multiple of |
| 4404 | mips_abi_regsize() are treated specially: Irix cc passes |
| 4405 | them in registers where gcc sometimes puts them on the |
| 4406 | stack. For maximum compatibility, we will put them in |
| 4407 | both places. */ |
| 4408 | int odd_sized_struct = ((len > mips_abi_regsize (gdbarch)) |
| 4409 | && (len % mips_abi_regsize (gdbarch) != 0)); |
| 4410 | /* Structures should be aligned to eight bytes (even arg registers) |
| 4411 | on MIPS_ABI_O32, if their first member has double precision. */ |
| 4412 | if (mips_abi_regsize (gdbarch) < 8 |
| 4413 | && mips_type_needs_double_align (arg_type)) |
| 4414 | { |
| 4415 | if ((argreg & 1)) |
| 4416 | argreg++; |
| 4417 | } |
| 4418 | /* Note: Floating-point values that didn't fit into an FP |
| 4419 | register are only written to memory. */ |
| 4420 | while (len > 0) |
| 4421 | { |
| 4422 | /* Remember if the argument was written to the stack. */ |
| 4423 | int stack_used_p = 0; |
| 4424 | int partial_len = (len < mips_abi_regsize (gdbarch) |
| 4425 | ? len : mips_abi_regsize (gdbarch)); |
| 4426 | |
| 4427 | if (mips_debug) |
| 4428 | fprintf_unfiltered (gdb_stdlog, " -- partial=%d", |
| 4429 | partial_len); |
| 4430 | |
| 4431 | /* Write this portion of the argument to the stack. */ |
| 4432 | if (argreg > MIPS_LAST_ARG_REGNUM |
| 4433 | || odd_sized_struct |
| 4434 | || fp_register_arg_p (typecode, arg_type)) |
| 4435 | { |
| 4436 | /* Should shorter than int integer values be |
| 4437 | promoted to int before being stored? */ |
| 4438 | int longword_offset = 0; |
| 4439 | CORE_ADDR addr; |
| 4440 | stack_used_p = 1; |
| 4441 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 4442 | { |
| 4443 | if (mips_stack_argsize (gdbarch) == 8 |
| 4444 | && (typecode == TYPE_CODE_INT |
| 4445 | || typecode == TYPE_CODE_PTR |
| 4446 | || typecode == TYPE_CODE_FLT) && len <= 4) |
| 4447 | longword_offset = mips_stack_argsize (gdbarch) - len; |
| 4448 | } |
| 4449 | |
| 4450 | if (mips_debug) |
| 4451 | { |
| 4452 | fprintf_unfiltered (gdb_stdlog, " - stack_offset=0x%s", |
| 4453 | paddr_nz (stack_offset)); |
| 4454 | fprintf_unfiltered (gdb_stdlog, " longword_offset=0x%s", |
| 4455 | paddr_nz (longword_offset)); |
| 4456 | } |
| 4457 | |
| 4458 | addr = sp + stack_offset + longword_offset; |
| 4459 | |
| 4460 | if (mips_debug) |
| 4461 | { |
| 4462 | int i; |
| 4463 | fprintf_unfiltered (gdb_stdlog, " @0x%s ", |
| 4464 | paddr_nz (addr)); |
| 4465 | for (i = 0; i < partial_len; i++) |
| 4466 | { |
| 4467 | fprintf_unfiltered (gdb_stdlog, "%02x", |
| 4468 | val[i] & 0xff); |
| 4469 | } |
| 4470 | } |
| 4471 | write_memory (addr, val, partial_len); |
| 4472 | } |
| 4473 | |
| 4474 | /* Note!!! This is NOT an else clause. Odd sized |
| 4475 | structs may go thru BOTH paths. Floating point |
| 4476 | arguments will not. */ |
| 4477 | /* Write this portion of the argument to a general |
| 4478 | purpose register. */ |
| 4479 | if (argreg <= MIPS_LAST_ARG_REGNUM |
| 4480 | && !fp_register_arg_p (typecode, arg_type)) |
| 4481 | { |
| 4482 | LONGEST regval = extract_signed_integer (val, partial_len); |
| 4483 | /* Value may need to be sign extended, because |
| 4484 | mips_isa_regsize() != mips_abi_regsize(). */ |
| 4485 | |
| 4486 | /* A non-floating-point argument being passed in a |
| 4487 | general register. If a struct or union, and if |
| 4488 | the remaining length is smaller than the register |
| 4489 | size, we have to adjust the register value on |
| 4490 | big endian targets. |
| 4491 | |
| 4492 | It does not seem to be necessary to do the |
| 4493 | same for integral types. |
| 4494 | |
| 4495 | Also don't do this adjustment on O64 binaries. |
| 4496 | |
| 4497 | cagney/2001-07-23: gdb/179: Also, GCC, when |
| 4498 | outputting LE O32 with sizeof (struct) < |
| 4499 | mips_abi_regsize(), generates a left shift as |
| 4500 | part of storing the argument in a register a |
| 4501 | register (the left shift isn't generated when |
| 4502 | sizeof (struct) >= mips_abi_regsize()). Since |
| 4503 | it is quite possible that this is GCC |
| 4504 | contradicting the LE/O32 ABI, GDB has not been |
| 4505 | adjusted to accommodate this. Either someone |
| 4506 | needs to demonstrate that the LE/O32 ABI |
| 4507 | specifies such a left shift OR this new ABI gets |
| 4508 | identified as such and GDB gets tweaked |
| 4509 | accordingly. */ |
| 4510 | |
| 4511 | if (mips_abi_regsize (gdbarch) < 8 |
| 4512 | && TARGET_BYTE_ORDER == BFD_ENDIAN_BIG |
| 4513 | && partial_len < mips_abi_regsize (gdbarch) |
| 4514 | && (typecode == TYPE_CODE_STRUCT || |
| 4515 | typecode == TYPE_CODE_UNION)) |
| 4516 | regval <<= ((mips_abi_regsize (gdbarch) - partial_len) * |
| 4517 | TARGET_CHAR_BIT); |
| 4518 | |
| 4519 | if (mips_debug) |
| 4520 | fprintf_filtered (gdb_stdlog, " - reg=%d val=%s", |
| 4521 | argreg, |
| 4522 | phex (regval, |
| 4523 | mips_abi_regsize (gdbarch))); |
| 4524 | write_register (argreg, regval); |
| 4525 | argreg++; |
| 4526 | |
| 4527 | /* Prevent subsequent floating point arguments from |
| 4528 | being passed in floating point registers. */ |
| 4529 | float_argreg = MIPS_LAST_FP_ARG_REGNUM + 1; |
| 4530 | } |
| 4531 | |
| 4532 | len -= partial_len; |
| 4533 | val += partial_len; |
| 4534 | |
| 4535 | /* Compute the the offset into the stack at which we |
| 4536 | will copy the next parameter. |
| 4537 | |
| 4538 | In older ABIs, the caller reserved space for |
| 4539 | registers that contained arguments. This was loosely |
| 4540 | refered to as their "home". Consequently, space is |
| 4541 | always allocated. */ |
| 4542 | |
| 4543 | stack_offset += align_up (partial_len, |
| 4544 | mips_stack_argsize (gdbarch)); |
| 4545 | } |
| 4546 | } |
| 4547 | if (mips_debug) |
| 4548 | fprintf_unfiltered (gdb_stdlog, "\n"); |
| 4549 | } |
| 4550 | |
| 4551 | regcache_cooked_write_signed (regcache, MIPS_SP_REGNUM, sp); |
| 4552 | |
| 4553 | /* Return adjusted stack pointer. */ |
| 4554 | return sp; |
| 4555 | } |
| 4556 | |
| 4557 | static void |
| 4558 | mips_o64_extract_return_value (struct type *valtype, |
| 4559 | char regbuf[], char *valbuf) |
| 4560 | { |
| 4561 | struct return_value_word lo; |
| 4562 | struct return_value_word hi; |
| 4563 | return_value_location (valtype, &hi, &lo); |
| 4564 | |
| 4565 | memcpy (valbuf + lo.buf_offset, |
| 4566 | regbuf + DEPRECATED_REGISTER_BYTE (NUM_REGS + lo.reg) + |
| 4567 | lo.reg_offset, lo.len); |
| 4568 | |
| 4569 | if (hi.len > 0) |
| 4570 | memcpy (valbuf + hi.buf_offset, |
| 4571 | regbuf + DEPRECATED_REGISTER_BYTE (NUM_REGS + hi.reg) + |
| 4572 | hi.reg_offset, hi.len); |
| 4573 | } |
| 4574 | |
| 4575 | static void |
| 4576 | mips_o64_store_return_value (struct type *valtype, char *valbuf) |
| 4577 | { |
| 4578 | char raw_buffer[MAX_REGISTER_SIZE]; |
| 4579 | struct return_value_word lo; |
| 4580 | struct return_value_word hi; |
| 4581 | return_value_location (valtype, &hi, &lo); |
| 4582 | |
| 4583 | memset (raw_buffer, 0, sizeof (raw_buffer)); |
| 4584 | memcpy (raw_buffer + lo.reg_offset, valbuf + lo.buf_offset, lo.len); |
| 4585 | deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (lo.reg), |
| 4586 | raw_buffer, register_size (current_gdbarch, |
| 4587 | lo.reg)); |
| 4588 | |
| 4589 | if (hi.len > 0) |
| 4590 | { |
| 4591 | memset (raw_buffer, 0, sizeof (raw_buffer)); |
| 4592 | memcpy (raw_buffer + hi.reg_offset, valbuf + hi.buf_offset, hi.len); |
| 4593 | deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (hi.reg), |
| 4594 | raw_buffer, |
| 4595 | register_size (current_gdbarch, |
| 4596 | hi.reg)); |
| 4597 | } |
| 4598 | } |
| 4599 | |
| 4600 | /* Floating point register management. |
| 4601 | |
| 4602 | Background: MIPS1 & 2 fp registers are 32 bits wide. To support |
| 4603 | 64bit operations, these early MIPS cpus treat fp register pairs |
| 4604 | (f0,f1) as a single register (d0). Later MIPS cpu's have 64 bit fp |
| 4605 | registers and offer a compatibility mode that emulates the MIPS2 fp |
| 4606 | model. When operating in MIPS2 fp compat mode, later cpu's split |
| 4607 | double precision floats into two 32-bit chunks and store them in |
| 4608 | consecutive fp regs. To display 64-bit floats stored in this |
| 4609 | fashion, we have to combine 32 bits from f0 and 32 bits from f1. |
| 4610 | Throw in user-configurable endianness and you have a real mess. |
| 4611 | |
| 4612 | The way this works is: |
| 4613 | - If we are in 32-bit mode or on a 32-bit processor, then a 64-bit |
| 4614 | double-precision value will be split across two logical registers. |
| 4615 | The lower-numbered logical register will hold the low-order bits, |
| 4616 | regardless of the processor's endianness. |
| 4617 | - If we are on a 64-bit processor, and we are looking for a |
| 4618 | single-precision value, it will be in the low ordered bits |
| 4619 | of a 64-bit GPR (after mfc1, for example) or a 64-bit register |
| 4620 | save slot in memory. |
| 4621 | - If we are in 64-bit mode, everything is straightforward. |
| 4622 | |
| 4623 | Note that this code only deals with "live" registers at the top of the |
| 4624 | stack. We will attempt to deal with saved registers later, when |
| 4625 | the raw/cooked register interface is in place. (We need a general |
| 4626 | interface that can deal with dynamic saved register sizes -- fp |
| 4627 | regs could be 32 bits wide in one frame and 64 on the frame above |
| 4628 | and below). */ |
| 4629 | |
| 4630 | static struct type * |
| 4631 | mips_float_register_type (void) |
| 4632 | { |
| 4633 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 4634 | return builtin_type_ieee_single_big; |
| 4635 | else |
| 4636 | return builtin_type_ieee_single_little; |
| 4637 | } |
| 4638 | |
| 4639 | static struct type * |
| 4640 | mips_double_register_type (void) |
| 4641 | { |
| 4642 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 4643 | return builtin_type_ieee_double_big; |
| 4644 | else |
| 4645 | return builtin_type_ieee_double_little; |
| 4646 | } |
| 4647 | |
| 4648 | /* Copy a 32-bit single-precision value from the current frame |
| 4649 | into rare_buffer. */ |
| 4650 | |
| 4651 | static void |
| 4652 | mips_read_fp_register_single (struct frame_info *frame, int regno, |
| 4653 | char *rare_buffer) |
| 4654 | { |
| 4655 | int raw_size = register_size (current_gdbarch, regno); |
| 4656 | char *raw_buffer = alloca (raw_size); |
| 4657 | |
| 4658 | if (!frame_register_read (frame, regno, raw_buffer)) |
| 4659 | error ("can't read register %d (%s)", regno, REGISTER_NAME (regno)); |
| 4660 | if (raw_size == 8) |
| 4661 | { |
| 4662 | /* We have a 64-bit value for this register. Find the low-order |
| 4663 | 32 bits. */ |
| 4664 | int offset; |
| 4665 | |
| 4666 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 4667 | offset = 4; |
| 4668 | else |
| 4669 | offset = 0; |
| 4670 | |
| 4671 | memcpy (rare_buffer, raw_buffer + offset, 4); |
| 4672 | } |
| 4673 | else |
| 4674 | { |
| 4675 | memcpy (rare_buffer, raw_buffer, 4); |
| 4676 | } |
| 4677 | } |
| 4678 | |
| 4679 | /* Copy a 64-bit double-precision value from the current frame into |
| 4680 | rare_buffer. This may include getting half of it from the next |
| 4681 | register. */ |
| 4682 | |
| 4683 | static void |
| 4684 | mips_read_fp_register_double (struct frame_info *frame, int regno, |
| 4685 | char *rare_buffer) |
| 4686 | { |
| 4687 | int raw_size = register_size (current_gdbarch, regno); |
| 4688 | |
| 4689 | if (raw_size == 8 && !mips2_fp_compat ()) |
| 4690 | { |
| 4691 | /* We have a 64-bit value for this register, and we should use |
| 4692 | all 64 bits. */ |
| 4693 | if (!frame_register_read (frame, regno, rare_buffer)) |
| 4694 | error ("can't read register %d (%s)", regno, REGISTER_NAME (regno)); |
| 4695 | } |
| 4696 | else |
| 4697 | { |
| 4698 | if ((regno - mips_regnum (current_gdbarch)->fp0) & 1) |
| 4699 | internal_error (__FILE__, __LINE__, |
| 4700 | "mips_read_fp_register_double: bad access to " |
| 4701 | "odd-numbered FP register"); |
| 4702 | |
| 4703 | /* mips_read_fp_register_single will find the correct 32 bits from |
| 4704 | each register. */ |
| 4705 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 4706 | { |
| 4707 | mips_read_fp_register_single (frame, regno, rare_buffer + 4); |
| 4708 | mips_read_fp_register_single (frame, regno + 1, rare_buffer); |
| 4709 | } |
| 4710 | else |
| 4711 | { |
| 4712 | mips_read_fp_register_single (frame, regno, rare_buffer); |
| 4713 | mips_read_fp_register_single (frame, regno + 1, rare_buffer + 4); |
| 4714 | } |
| 4715 | } |
| 4716 | } |
| 4717 | |
| 4718 | static void |
| 4719 | mips_print_fp_register (struct ui_file *file, struct frame_info *frame, |
| 4720 | int regnum) |
| 4721 | { /* do values for FP (float) regs */ |
| 4722 | char *raw_buffer; |
| 4723 | double doub, flt1; /* doubles extracted from raw hex data */ |
| 4724 | int inv1, inv2; |
| 4725 | |
| 4726 | raw_buffer = |
| 4727 | (char *) alloca (2 * |
| 4728 | register_size (current_gdbarch, |
| 4729 | mips_regnum (current_gdbarch)->fp0)); |
| 4730 | |
| 4731 | fprintf_filtered (file, "%s:", REGISTER_NAME (regnum)); |
| 4732 | fprintf_filtered (file, "%*s", 4 - (int) strlen (REGISTER_NAME (regnum)), |
| 4733 | ""); |
| 4734 | |
| 4735 | if (register_size (current_gdbarch, regnum) == 4 || mips2_fp_compat ()) |
| 4736 | { |
| 4737 | /* 4-byte registers: Print hex and floating. Also print even |
| 4738 | numbered registers as doubles. */ |
| 4739 | mips_read_fp_register_single (frame, regnum, raw_buffer); |
| 4740 | flt1 = unpack_double (mips_float_register_type (), raw_buffer, &inv1); |
| 4741 | |
| 4742 | print_scalar_formatted (raw_buffer, builtin_type_uint32, 'x', 'w', |
| 4743 | file); |
| 4744 | |
| 4745 | fprintf_filtered (file, " flt: "); |
| 4746 | if (inv1) |
| 4747 | fprintf_filtered (file, " <invalid float> "); |
| 4748 | else |
| 4749 | fprintf_filtered (file, "%-17.9g", flt1); |
| 4750 | |
| 4751 | if (regnum % 2 == 0) |
| 4752 | { |
| 4753 | mips_read_fp_register_double (frame, regnum, raw_buffer); |
| 4754 | doub = unpack_double (mips_double_register_type (), raw_buffer, |
| 4755 | &inv2); |
| 4756 | |
| 4757 | fprintf_filtered (file, " dbl: "); |
| 4758 | if (inv2) |
| 4759 | fprintf_filtered (file, "<invalid double>"); |
| 4760 | else |
| 4761 | fprintf_filtered (file, "%-24.17g", doub); |
| 4762 | } |
| 4763 | } |
| 4764 | else |
| 4765 | { |
| 4766 | /* Eight byte registers: print each one as hex, float and double. */ |
| 4767 | mips_read_fp_register_single (frame, regnum, raw_buffer); |
| 4768 | flt1 = unpack_double (mips_float_register_type (), raw_buffer, &inv1); |
| 4769 | |
| 4770 | mips_read_fp_register_double (frame, regnum, raw_buffer); |
| 4771 | doub = unpack_double (mips_double_register_type (), raw_buffer, &inv2); |
| 4772 | |
| 4773 | |
| 4774 | print_scalar_formatted (raw_buffer, builtin_type_uint64, 'x', 'g', |
| 4775 | file); |
| 4776 | |
| 4777 | fprintf_filtered (file, " flt: "); |
| 4778 | if (inv1) |
| 4779 | fprintf_filtered (file, "<invalid float>"); |
| 4780 | else |
| 4781 | fprintf_filtered (file, "%-17.9g", flt1); |
| 4782 | |
| 4783 | fprintf_filtered (file, " dbl: "); |
| 4784 | if (inv2) |
| 4785 | fprintf_filtered (file, "<invalid double>"); |
| 4786 | else |
| 4787 | fprintf_filtered (file, "%-24.17g", doub); |
| 4788 | } |
| 4789 | } |
| 4790 | |
| 4791 | static void |
| 4792 | mips_print_register (struct ui_file *file, struct frame_info *frame, |
| 4793 | int regnum, int all) |
| 4794 | { |
| 4795 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 4796 | char raw_buffer[MAX_REGISTER_SIZE]; |
| 4797 | int offset; |
| 4798 | |
| 4799 | if (TYPE_CODE (gdbarch_register_type (gdbarch, regnum)) == TYPE_CODE_FLT) |
| 4800 | { |
| 4801 | mips_print_fp_register (file, frame, regnum); |
| 4802 | return; |
| 4803 | } |
| 4804 | |
| 4805 | /* Get the data in raw format. */ |
| 4806 | if (!frame_register_read (frame, regnum, raw_buffer)) |
| 4807 | { |
| 4808 | fprintf_filtered (file, "%s: [Invalid]", REGISTER_NAME (regnum)); |
| 4809 | return; |
| 4810 | } |
| 4811 | |
| 4812 | fputs_filtered (REGISTER_NAME (regnum), file); |
| 4813 | |
| 4814 | /* The problem with printing numeric register names (r26, etc.) is that |
| 4815 | the user can't use them on input. Probably the best solution is to |
| 4816 | fix it so that either the numeric or the funky (a2, etc.) names |
| 4817 | are accepted on input. */ |
| 4818 | if (regnum < MIPS_NUMREGS) |
| 4819 | fprintf_filtered (file, "(r%d): ", regnum); |
| 4820 | else |
| 4821 | fprintf_filtered (file, ": "); |
| 4822 | |
| 4823 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 4824 | offset = |
| 4825 | register_size (current_gdbarch, |
| 4826 | regnum) - register_size (current_gdbarch, regnum); |
| 4827 | else |
| 4828 | offset = 0; |
| 4829 | |
| 4830 | print_scalar_formatted (raw_buffer + offset, |
| 4831 | gdbarch_register_type (gdbarch, regnum), 'x', 0, |
| 4832 | file); |
| 4833 | } |
| 4834 | |
| 4835 | /* Replacement for generic do_registers_info. |
| 4836 | Print regs in pretty columns. */ |
| 4837 | |
| 4838 | static int |
| 4839 | print_fp_register_row (struct ui_file *file, struct frame_info *frame, |
| 4840 | int regnum) |
| 4841 | { |
| 4842 | fprintf_filtered (file, " "); |
| 4843 | mips_print_fp_register (file, frame, regnum); |
| 4844 | fprintf_filtered (file, "\n"); |
| 4845 | return regnum + 1; |
| 4846 | } |
| 4847 | |
| 4848 | |
| 4849 | /* Print a row's worth of GP (int) registers, with name labels above */ |
| 4850 | |
| 4851 | static int |
| 4852 | print_gp_register_row (struct ui_file *file, struct frame_info *frame, |
| 4853 | int start_regnum) |
| 4854 | { |
| 4855 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 4856 | /* do values for GP (int) regs */ |
| 4857 | char raw_buffer[MAX_REGISTER_SIZE]; |
| 4858 | int ncols = (mips_abi_regsize (gdbarch) == 8 ? 4 : 8); /* display cols per row */ |
| 4859 | int col, byte; |
| 4860 | int regnum; |
| 4861 | |
| 4862 | /* For GP registers, we print a separate row of names above the vals */ |
| 4863 | fprintf_filtered (file, " "); |
| 4864 | for (col = 0, regnum = start_regnum; |
| 4865 | col < ncols && regnum < NUM_REGS + NUM_PSEUDO_REGS; regnum++) |
| 4866 | { |
| 4867 | if (*REGISTER_NAME (regnum) == '\0') |
| 4868 | continue; /* unused register */ |
| 4869 | if (TYPE_CODE (gdbarch_register_type (gdbarch, regnum)) == |
| 4870 | TYPE_CODE_FLT) |
| 4871 | break; /* end the row: reached FP register */ |
| 4872 | fprintf_filtered (file, |
| 4873 | mips_abi_regsize (current_gdbarch) == 8 ? "%17s" : "%9s", |
| 4874 | REGISTER_NAME (regnum)); |
| 4875 | col++; |
| 4876 | } |
| 4877 | /* print the R0 to R31 names */ |
| 4878 | if ((start_regnum % NUM_REGS) < MIPS_NUMREGS) |
| 4879 | fprintf_filtered (file, "\n R%-4d", start_regnum % NUM_REGS); |
| 4880 | else |
| 4881 | fprintf_filtered (file, "\n "); |
| 4882 | |
| 4883 | /* now print the values in hex, 4 or 8 to the row */ |
| 4884 | for (col = 0, regnum = start_regnum; |
| 4885 | col < ncols && regnum < NUM_REGS + NUM_PSEUDO_REGS; regnum++) |
| 4886 | { |
| 4887 | if (*REGISTER_NAME (regnum) == '\0') |
| 4888 | continue; /* unused register */ |
| 4889 | if (TYPE_CODE (gdbarch_register_type (gdbarch, regnum)) == |
| 4890 | TYPE_CODE_FLT) |
| 4891 | break; /* end row: reached FP register */ |
| 4892 | /* OK: get the data in raw format. */ |
| 4893 | if (!frame_register_read (frame, regnum, raw_buffer)) |
| 4894 | error ("can't read register %d (%s)", regnum, REGISTER_NAME (regnum)); |
| 4895 | /* pad small registers */ |
| 4896 | for (byte = 0; |
| 4897 | byte < (mips_abi_regsize (current_gdbarch) |
| 4898 | - register_size (current_gdbarch, regnum)); byte++) |
| 4899 | printf_filtered (" "); |
| 4900 | /* Now print the register value in hex, endian order. */ |
| 4901 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 4902 | for (byte = |
| 4903 | register_size (current_gdbarch, |
| 4904 | regnum) - register_size (current_gdbarch, regnum); |
| 4905 | byte < register_size (current_gdbarch, regnum); byte++) |
| 4906 | fprintf_filtered (file, "%02x", (unsigned char) raw_buffer[byte]); |
| 4907 | else |
| 4908 | for (byte = register_size (current_gdbarch, regnum) - 1; |
| 4909 | byte >= 0; byte--) |
| 4910 | fprintf_filtered (file, "%02x", (unsigned char) raw_buffer[byte]); |
| 4911 | fprintf_filtered (file, " "); |
| 4912 | col++; |
| 4913 | } |
| 4914 | if (col > 0) /* ie. if we actually printed anything... */ |
| 4915 | fprintf_filtered (file, "\n"); |
| 4916 | |
| 4917 | return regnum; |
| 4918 | } |
| 4919 | |
| 4920 | /* MIPS_DO_REGISTERS_INFO(): called by "info register" command */ |
| 4921 | |
| 4922 | static void |
| 4923 | mips_print_registers_info (struct gdbarch *gdbarch, struct ui_file *file, |
| 4924 | struct frame_info *frame, int regnum, int all) |
| 4925 | { |
| 4926 | if (regnum != -1) /* do one specified register */ |
| 4927 | { |
| 4928 | gdb_assert (regnum >= NUM_REGS); |
| 4929 | if (*(REGISTER_NAME (regnum)) == '\0') |
| 4930 | error ("Not a valid register for the current processor type"); |
| 4931 | |
| 4932 | mips_print_register (file, frame, regnum, 0); |
| 4933 | fprintf_filtered (file, "\n"); |
| 4934 | } |
| 4935 | else |
| 4936 | /* do all (or most) registers */ |
| 4937 | { |
| 4938 | regnum = NUM_REGS; |
| 4939 | while (regnum < NUM_REGS + NUM_PSEUDO_REGS) |
| 4940 | { |
| 4941 | if (TYPE_CODE (gdbarch_register_type (gdbarch, regnum)) == |
| 4942 | TYPE_CODE_FLT) |
| 4943 | { |
| 4944 | if (all) /* true for "INFO ALL-REGISTERS" command */ |
| 4945 | regnum = print_fp_register_row (file, frame, regnum); |
| 4946 | else |
| 4947 | regnum += MIPS_NUMREGS; /* skip floating point regs */ |
| 4948 | } |
| 4949 | else |
| 4950 | regnum = print_gp_register_row (file, frame, regnum); |
| 4951 | } |
| 4952 | } |
| 4953 | } |
| 4954 | |
| 4955 | /* Is this a branch with a delay slot? */ |
| 4956 | |
| 4957 | static int is_delayed (unsigned long); |
| 4958 | |
| 4959 | static int |
| 4960 | is_delayed (unsigned long insn) |
| 4961 | { |
| 4962 | int i; |
| 4963 | for (i = 0; i < NUMOPCODES; ++i) |
| 4964 | if (mips_opcodes[i].pinfo != INSN_MACRO |
| 4965 | && (insn & mips_opcodes[i].mask) == mips_opcodes[i].match) |
| 4966 | break; |
| 4967 | return (i < NUMOPCODES |
| 4968 | && (mips_opcodes[i].pinfo & (INSN_UNCOND_BRANCH_DELAY |
| 4969 | | INSN_COND_BRANCH_DELAY |
| 4970 | | INSN_COND_BRANCH_LIKELY))); |
| 4971 | } |
| 4972 | |
| 4973 | int |
| 4974 | mips_step_skips_delay (CORE_ADDR pc) |
| 4975 | { |
| 4976 | char buf[MIPS_INSTLEN]; |
| 4977 | |
| 4978 | /* There is no branch delay slot on MIPS16. */ |
| 4979 | if (pc_is_mips16 (pc)) |
| 4980 | return 0; |
| 4981 | |
| 4982 | if (target_read_memory (pc, buf, MIPS_INSTLEN) != 0) |
| 4983 | /* If error reading memory, guess that it is not a delayed branch. */ |
| 4984 | return 0; |
| 4985 | return is_delayed ((unsigned long) |
| 4986 | extract_unsigned_integer (buf, MIPS_INSTLEN)); |
| 4987 | } |
| 4988 | |
| 4989 | /* To skip prologues, I use this predicate. Returns either PC itself |
| 4990 | if the code at PC does not look like a function prologue; otherwise |
| 4991 | returns an address that (if we're lucky) follows the prologue. If |
| 4992 | LENIENT, then we must skip everything which is involved in setting |
| 4993 | up the frame (it's OK to skip more, just so long as we don't skip |
| 4994 | anything which might clobber the registers which are being saved. |
| 4995 | We must skip more in the case where part of the prologue is in the |
| 4996 | delay slot of a non-prologue instruction). */ |
| 4997 | |
| 4998 | static CORE_ADDR |
| 4999 | mips_skip_prologue (CORE_ADDR pc) |
| 5000 | { |
| 5001 | /* See if we can determine the end of the prologue via the symbol table. |
| 5002 | If so, then return either PC, or the PC after the prologue, whichever |
| 5003 | is greater. */ |
| 5004 | |
| 5005 | CORE_ADDR post_prologue_pc = after_prologue (pc); |
| 5006 | CORE_ADDR limit_pc; |
| 5007 | |
| 5008 | if (post_prologue_pc != 0) |
| 5009 | return max (pc, post_prologue_pc); |
| 5010 | |
| 5011 | /* Can't determine prologue from the symbol table, need to examine |
| 5012 | instructions. */ |
| 5013 | |
| 5014 | /* Find an upper limit on the function prologue using the debug |
| 5015 | information. If the debug information could not be used to provide |
| 5016 | that bound, then use an arbitrary large number as the upper bound. */ |
| 5017 | limit_pc = skip_prologue_using_sal (pc); |
| 5018 | if (limit_pc == 0) |
| 5019 | limit_pc = pc + 100; /* Magic. */ |
| 5020 | |
| 5021 | if (pc_is_mips16 (pc)) |
| 5022 | return mips16_scan_prologue (pc, limit_pc, NULL, NULL); |
| 5023 | else |
| 5024 | return mips32_scan_prologue (pc, limit_pc, NULL, NULL); |
| 5025 | } |
| 5026 | |
| 5027 | /* Root of all "set mips "/"show mips " commands. This will eventually be |
| 5028 | used for all MIPS-specific commands. */ |
| 5029 | |
| 5030 | static void |
| 5031 | show_mips_command (char *args, int from_tty) |
| 5032 | { |
| 5033 | help_list (showmipscmdlist, "show mips ", all_commands, gdb_stdout); |
| 5034 | } |
| 5035 | |
| 5036 | static void |
| 5037 | set_mips_command (char *args, int from_tty) |
| 5038 | { |
| 5039 | printf_unfiltered |
| 5040 | ("\"set mips\" must be followed by an appropriate subcommand.\n"); |
| 5041 | help_list (setmipscmdlist, "set mips ", all_commands, gdb_stdout); |
| 5042 | } |
| 5043 | |
| 5044 | /* Commands to show/set the MIPS FPU type. */ |
| 5045 | |
| 5046 | static void |
| 5047 | show_mipsfpu_command (char *args, int from_tty) |
| 5048 | { |
| 5049 | char *fpu; |
| 5050 | switch (MIPS_FPU_TYPE) |
| 5051 | { |
| 5052 | case MIPS_FPU_SINGLE: |
| 5053 | fpu = "single-precision"; |
| 5054 | break; |
| 5055 | case MIPS_FPU_DOUBLE: |
| 5056 | fpu = "double-precision"; |
| 5057 | break; |
| 5058 | case MIPS_FPU_NONE: |
| 5059 | fpu = "absent (none)"; |
| 5060 | break; |
| 5061 | default: |
| 5062 | internal_error (__FILE__, __LINE__, "bad switch"); |
| 5063 | } |
| 5064 | if (mips_fpu_type_auto) |
| 5065 | printf_unfiltered |
| 5066 | ("The MIPS floating-point coprocessor is set automatically (currently %s)\n", |
| 5067 | fpu); |
| 5068 | else |
| 5069 | printf_unfiltered |
| 5070 | ("The MIPS floating-point coprocessor is assumed to be %s\n", fpu); |
| 5071 | } |
| 5072 | |
| 5073 | |
| 5074 | static void |
| 5075 | set_mipsfpu_command (char *args, int from_tty) |
| 5076 | { |
| 5077 | printf_unfiltered |
| 5078 | ("\"set mipsfpu\" must be followed by \"double\", \"single\",\"none\" or \"auto\".\n"); |
| 5079 | show_mipsfpu_command (args, from_tty); |
| 5080 | } |
| 5081 | |
| 5082 | static void |
| 5083 | set_mipsfpu_single_command (char *args, int from_tty) |
| 5084 | { |
| 5085 | struct gdbarch_info info; |
| 5086 | gdbarch_info_init (&info); |
| 5087 | mips_fpu_type = MIPS_FPU_SINGLE; |
| 5088 | mips_fpu_type_auto = 0; |
| 5089 | /* FIXME: cagney/2003-11-15: Should be setting a field in "info" |
| 5090 | instead of relying on globals. Doing that would let generic code |
| 5091 | handle the search for this specific architecture. */ |
| 5092 | if (!gdbarch_update_p (info)) |
| 5093 | internal_error (__FILE__, __LINE__, "set mipsfpu failed"); |
| 5094 | } |
| 5095 | |
| 5096 | static void |
| 5097 | set_mipsfpu_double_command (char *args, int from_tty) |
| 5098 | { |
| 5099 | struct gdbarch_info info; |
| 5100 | gdbarch_info_init (&info); |
| 5101 | mips_fpu_type = MIPS_FPU_DOUBLE; |
| 5102 | mips_fpu_type_auto = 0; |
| 5103 | /* FIXME: cagney/2003-11-15: Should be setting a field in "info" |
| 5104 | instead of relying on globals. Doing that would let generic code |
| 5105 | handle the search for this specific architecture. */ |
| 5106 | if (!gdbarch_update_p (info)) |
| 5107 | internal_error (__FILE__, __LINE__, "set mipsfpu failed"); |
| 5108 | } |
| 5109 | |
| 5110 | static void |
| 5111 | set_mipsfpu_none_command (char *args, int from_tty) |
| 5112 | { |
| 5113 | struct gdbarch_info info; |
| 5114 | gdbarch_info_init (&info); |
| 5115 | mips_fpu_type = MIPS_FPU_NONE; |
| 5116 | mips_fpu_type_auto = 0; |
| 5117 | /* FIXME: cagney/2003-11-15: Should be setting a field in "info" |
| 5118 | instead of relying on globals. Doing that would let generic code |
| 5119 | handle the search for this specific architecture. */ |
| 5120 | if (!gdbarch_update_p (info)) |
| 5121 | internal_error (__FILE__, __LINE__, "set mipsfpu failed"); |
| 5122 | } |
| 5123 | |
| 5124 | static void |
| 5125 | set_mipsfpu_auto_command (char *args, int from_tty) |
| 5126 | { |
| 5127 | mips_fpu_type_auto = 1; |
| 5128 | } |
| 5129 | |
| 5130 | /* Attempt to identify the particular processor model by reading the |
| 5131 | processor id. NOTE: cagney/2003-11-15: Firstly it isn't clear that |
| 5132 | the relevant processor still exists (it dates back to '94) and |
| 5133 | secondly this is not the way to do this. The processor type should |
| 5134 | be set by forcing an architecture change. */ |
| 5135 | |
| 5136 | void |
| 5137 | deprecated_mips_set_processor_regs_hack (void) |
| 5138 | { |
| 5139 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 5140 | CORE_ADDR prid; |
| 5141 | |
| 5142 | prid = read_register (PRID_REGNUM); |
| 5143 | |
| 5144 | if ((prid & ~0xf) == 0x700) |
| 5145 | tdep->mips_processor_reg_names = mips_r3041_reg_names; |
| 5146 | } |
| 5147 | |
| 5148 | /* Just like reinit_frame_cache, but with the right arguments to be |
| 5149 | callable as an sfunc. */ |
| 5150 | |
| 5151 | static void |
| 5152 | reinit_frame_cache_sfunc (char *args, int from_tty, |
| 5153 | struct cmd_list_element *c) |
| 5154 | { |
| 5155 | reinit_frame_cache (); |
| 5156 | } |
| 5157 | |
| 5158 | static int |
| 5159 | gdb_print_insn_mips (bfd_vma memaddr, struct disassemble_info *info) |
| 5160 | { |
| 5161 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 5162 | mips_extra_func_info_t proc_desc; |
| 5163 | |
| 5164 | /* Search for the function containing this address. Set the low bit |
| 5165 | of the address when searching, in case we were given an even address |
| 5166 | that is the start of a 16-bit function. If we didn't do this, |
| 5167 | the search would fail because the symbol table says the function |
| 5168 | starts at an odd address, i.e. 1 byte past the given address. */ |
| 5169 | memaddr = ADDR_BITS_REMOVE (memaddr); |
| 5170 | proc_desc = non_heuristic_proc_desc (make_mips16_addr (memaddr), NULL); |
| 5171 | |
| 5172 | /* Make an attempt to determine if this is a 16-bit function. If |
| 5173 | the procedure descriptor exists and the address therein is odd, |
| 5174 | it's definitely a 16-bit function. Otherwise, we have to just |
| 5175 | guess that if the address passed in is odd, it's 16-bits. */ |
| 5176 | /* FIXME: cagney/2003-06-26: Is this even necessary? The |
| 5177 | disassembler needs to be able to locally determine the ISA, and |
| 5178 | not rely on GDB. Otherwize the stand-alone 'objdump -d' will not |
| 5179 | work. */ |
| 5180 | if (proc_desc) |
| 5181 | { |
| 5182 | if (pc_is_mips16 (PROC_LOW_ADDR (proc_desc))) |
| 5183 | info->mach = bfd_mach_mips16; |
| 5184 | } |
| 5185 | else |
| 5186 | { |
| 5187 | if (pc_is_mips16 (memaddr)) |
| 5188 | info->mach = bfd_mach_mips16; |
| 5189 | } |
| 5190 | |
| 5191 | /* Round down the instruction address to the appropriate boundary. */ |
| 5192 | memaddr &= (info->mach == bfd_mach_mips16 ? ~1 : ~3); |
| 5193 | |
| 5194 | /* Set the disassembler options. */ |
| 5195 | if (tdep->mips_abi == MIPS_ABI_N32 || tdep->mips_abi == MIPS_ABI_N64) |
| 5196 | { |
| 5197 | /* Set up the disassembler info, so that we get the right |
| 5198 | register names from libopcodes. */ |
| 5199 | if (tdep->mips_abi == MIPS_ABI_N32) |
| 5200 | info->disassembler_options = "gpr-names=n32"; |
| 5201 | else |
| 5202 | info->disassembler_options = "gpr-names=64"; |
| 5203 | info->flavour = bfd_target_elf_flavour; |
| 5204 | } |
| 5205 | else |
| 5206 | /* This string is not recognized explicitly by the disassembler, |
| 5207 | but it tells the disassembler to not try to guess the ABI from |
| 5208 | the bfd elf headers, such that, if the user overrides the ABI |
| 5209 | of a program linked as NewABI, the disassembly will follow the |
| 5210 | register naming conventions specified by the user. */ |
| 5211 | info->disassembler_options = "gpr-names=32"; |
| 5212 | |
| 5213 | /* Call the appropriate disassembler based on the target endian-ness. */ |
| 5214 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 5215 | return print_insn_big_mips (memaddr, info); |
| 5216 | else |
| 5217 | return print_insn_little_mips (memaddr, info); |
| 5218 | } |
| 5219 | |
| 5220 | /* This function implements the BREAKPOINT_FROM_PC macro. It uses the program |
| 5221 | counter value to determine whether a 16- or 32-bit breakpoint should be |
| 5222 | used. It returns a pointer to a string of bytes that encode a breakpoint |
| 5223 | instruction, stores the length of the string to *lenptr, and adjusts pc |
| 5224 | (if necessary) to point to the actual memory location where the |
| 5225 | breakpoint should be inserted. */ |
| 5226 | |
| 5227 | static const unsigned char * |
| 5228 | mips_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
| 5229 | { |
| 5230 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 5231 | { |
| 5232 | if (pc_is_mips16 (*pcptr)) |
| 5233 | { |
| 5234 | static unsigned char mips16_big_breakpoint[] = { 0xe8, 0xa5 }; |
| 5235 | *pcptr = unmake_mips16_addr (*pcptr); |
| 5236 | *lenptr = sizeof (mips16_big_breakpoint); |
| 5237 | return mips16_big_breakpoint; |
| 5238 | } |
| 5239 | else |
| 5240 | { |
| 5241 | /* The IDT board uses an unusual breakpoint value, and |
| 5242 | sometimes gets confused when it sees the usual MIPS |
| 5243 | breakpoint instruction. */ |
| 5244 | static unsigned char big_breakpoint[] = { 0, 0x5, 0, 0xd }; |
| 5245 | static unsigned char pmon_big_breakpoint[] = { 0, 0, 0, 0xd }; |
| 5246 | static unsigned char idt_big_breakpoint[] = { 0, 0, 0x0a, 0xd }; |
| 5247 | |
| 5248 | *lenptr = sizeof (big_breakpoint); |
| 5249 | |
| 5250 | if (strcmp (target_shortname, "mips") == 0) |
| 5251 | return idt_big_breakpoint; |
| 5252 | else if (strcmp (target_shortname, "ddb") == 0 |
| 5253 | || strcmp (target_shortname, "pmon") == 0 |
| 5254 | || strcmp (target_shortname, "lsi") == 0) |
| 5255 | return pmon_big_breakpoint; |
| 5256 | else |
| 5257 | return big_breakpoint; |
| 5258 | } |
| 5259 | } |
| 5260 | else |
| 5261 | { |
| 5262 | if (pc_is_mips16 (*pcptr)) |
| 5263 | { |
| 5264 | static unsigned char mips16_little_breakpoint[] = { 0xa5, 0xe8 }; |
| 5265 | *pcptr = unmake_mips16_addr (*pcptr); |
| 5266 | *lenptr = sizeof (mips16_little_breakpoint); |
| 5267 | return mips16_little_breakpoint; |
| 5268 | } |
| 5269 | else |
| 5270 | { |
| 5271 | static unsigned char little_breakpoint[] = { 0xd, 0, 0x5, 0 }; |
| 5272 | static unsigned char pmon_little_breakpoint[] = { 0xd, 0, 0, 0 }; |
| 5273 | static unsigned char idt_little_breakpoint[] = { 0xd, 0x0a, 0, 0 }; |
| 5274 | |
| 5275 | *lenptr = sizeof (little_breakpoint); |
| 5276 | |
| 5277 | if (strcmp (target_shortname, "mips") == 0) |
| 5278 | return idt_little_breakpoint; |
| 5279 | else if (strcmp (target_shortname, "ddb") == 0 |
| 5280 | || strcmp (target_shortname, "pmon") == 0 |
| 5281 | || strcmp (target_shortname, "lsi") == 0) |
| 5282 | return pmon_little_breakpoint; |
| 5283 | else |
| 5284 | return little_breakpoint; |
| 5285 | } |
| 5286 | } |
| 5287 | } |
| 5288 | |
| 5289 | /* If PC is in a mips16 call or return stub, return the address of the target |
| 5290 | PC, which is either the callee or the caller. There are several |
| 5291 | cases which must be handled: |
| 5292 | |
| 5293 | * If the PC is in __mips16_ret_{d,s}f, this is a return stub and the |
| 5294 | target PC is in $31 ($ra). |
| 5295 | * If the PC is in __mips16_call_stub_{1..10}, this is a call stub |
| 5296 | and the target PC is in $2. |
| 5297 | * If the PC at the start of __mips16_call_stub_{s,d}f_{0..10}, i.e. |
| 5298 | before the jal instruction, this is effectively a call stub |
| 5299 | and the the target PC is in $2. Otherwise this is effectively |
| 5300 | a return stub and the target PC is in $18. |
| 5301 | |
| 5302 | See the source code for the stubs in gcc/config/mips/mips16.S for |
| 5303 | gory details. |
| 5304 | |
| 5305 | This function implements the SKIP_TRAMPOLINE_CODE macro. |
| 5306 | */ |
| 5307 | |
| 5308 | static CORE_ADDR |
| 5309 | mips_skip_stub (CORE_ADDR pc) |
| 5310 | { |
| 5311 | char *name; |
| 5312 | CORE_ADDR start_addr; |
| 5313 | |
| 5314 | /* Find the starting address and name of the function containing the PC. */ |
| 5315 | if (find_pc_partial_function (pc, &name, &start_addr, NULL) == 0) |
| 5316 | return 0; |
| 5317 | |
| 5318 | /* If the PC is in __mips16_ret_{d,s}f, this is a return stub and the |
| 5319 | target PC is in $31 ($ra). */ |
| 5320 | if (strcmp (name, "__mips16_ret_sf") == 0 |
| 5321 | || strcmp (name, "__mips16_ret_df") == 0) |
| 5322 | return read_signed_register (RA_REGNUM); |
| 5323 | |
| 5324 | if (strncmp (name, "__mips16_call_stub_", 19) == 0) |
| 5325 | { |
| 5326 | /* If the PC is in __mips16_call_stub_{1..10}, this is a call stub |
| 5327 | and the target PC is in $2. */ |
| 5328 | if (name[19] >= '0' && name[19] <= '9') |
| 5329 | return read_signed_register (2); |
| 5330 | |
| 5331 | /* If the PC at the start of __mips16_call_stub_{s,d}f_{0..10}, i.e. |
| 5332 | before the jal instruction, this is effectively a call stub |
| 5333 | and the the target PC is in $2. Otherwise this is effectively |
| 5334 | a return stub and the target PC is in $18. */ |
| 5335 | else if (name[19] == 's' || name[19] == 'd') |
| 5336 | { |
| 5337 | if (pc == start_addr) |
| 5338 | { |
| 5339 | /* Check if the target of the stub is a compiler-generated |
| 5340 | stub. Such a stub for a function bar might have a name |
| 5341 | like __fn_stub_bar, and might look like this: |
| 5342 | mfc1 $4,$f13 |
| 5343 | mfc1 $5,$f12 |
| 5344 | mfc1 $6,$f15 |
| 5345 | mfc1 $7,$f14 |
| 5346 | la $1,bar (becomes a lui/addiu pair) |
| 5347 | jr $1 |
| 5348 | So scan down to the lui/addi and extract the target |
| 5349 | address from those two instructions. */ |
| 5350 | |
| 5351 | CORE_ADDR target_pc = read_signed_register (2); |
| 5352 | t_inst inst; |
| 5353 | int i; |
| 5354 | |
| 5355 | /* See if the name of the target function is __fn_stub_*. */ |
| 5356 | if (find_pc_partial_function (target_pc, &name, NULL, NULL) == |
| 5357 | 0) |
| 5358 | return target_pc; |
| 5359 | if (strncmp (name, "__fn_stub_", 10) != 0 |
| 5360 | && strcmp (name, "etext") != 0 |
| 5361 | && strcmp (name, "_etext") != 0) |
| 5362 | return target_pc; |
| 5363 | |
| 5364 | /* Scan through this _fn_stub_ code for the lui/addiu pair. |
| 5365 | The limit on the search is arbitrarily set to 20 |
| 5366 | instructions. FIXME. */ |
| 5367 | for (i = 0, pc = 0; i < 20; i++, target_pc += MIPS_INSTLEN) |
| 5368 | { |
| 5369 | inst = mips_fetch_instruction (target_pc); |
| 5370 | if ((inst & 0xffff0000) == 0x3c010000) /* lui $at */ |
| 5371 | pc = (inst << 16) & 0xffff0000; /* high word */ |
| 5372 | else if ((inst & 0xffff0000) == 0x24210000) /* addiu $at */ |
| 5373 | return pc | (inst & 0xffff); /* low word */ |
| 5374 | } |
| 5375 | |
| 5376 | /* Couldn't find the lui/addui pair, so return stub address. */ |
| 5377 | return target_pc; |
| 5378 | } |
| 5379 | else |
| 5380 | /* This is the 'return' part of a call stub. The return |
| 5381 | address is in $r18. */ |
| 5382 | return read_signed_register (18); |
| 5383 | } |
| 5384 | } |
| 5385 | return 0; /* not a stub */ |
| 5386 | } |
| 5387 | |
| 5388 | |
| 5389 | /* Return non-zero if the PC is inside a call thunk (aka stub or trampoline). |
| 5390 | This implements the IN_SOLIB_CALL_TRAMPOLINE macro. */ |
| 5391 | |
| 5392 | static int |
| 5393 | mips_in_call_stub (CORE_ADDR pc, char *name) |
| 5394 | { |
| 5395 | CORE_ADDR start_addr; |
| 5396 | |
| 5397 | /* Find the starting address of the function containing the PC. If the |
| 5398 | caller didn't give us a name, look it up at the same time. */ |
| 5399 | if (find_pc_partial_function (pc, name ? NULL : &name, &start_addr, NULL) == |
| 5400 | 0) |
| 5401 | return 0; |
| 5402 | |
| 5403 | if (strncmp (name, "__mips16_call_stub_", 19) == 0) |
| 5404 | { |
| 5405 | /* If the PC is in __mips16_call_stub_{1..10}, this is a call stub. */ |
| 5406 | if (name[19] >= '0' && name[19] <= '9') |
| 5407 | return 1; |
| 5408 | /* If the PC at the start of __mips16_call_stub_{s,d}f_{0..10}, i.e. |
| 5409 | before the jal instruction, this is effectively a call stub. */ |
| 5410 | else if (name[19] == 's' || name[19] == 'd') |
| 5411 | return pc == start_addr; |
| 5412 | } |
| 5413 | |
| 5414 | return 0; /* not a stub */ |
| 5415 | } |
| 5416 | |
| 5417 | |
| 5418 | /* Return non-zero if the PC is inside a return thunk (aka stub or trampoline). |
| 5419 | This implements the IN_SOLIB_RETURN_TRAMPOLINE macro. */ |
| 5420 | |
| 5421 | static int |
| 5422 | mips_in_return_stub (CORE_ADDR pc, char *name) |
| 5423 | { |
| 5424 | CORE_ADDR start_addr; |
| 5425 | |
| 5426 | /* Find the starting address of the function containing the PC. */ |
| 5427 | if (find_pc_partial_function (pc, NULL, &start_addr, NULL) == 0) |
| 5428 | return 0; |
| 5429 | |
| 5430 | /* If the PC is in __mips16_ret_{d,s}f, this is a return stub. */ |
| 5431 | if (strcmp (name, "__mips16_ret_sf") == 0 |
| 5432 | || strcmp (name, "__mips16_ret_df") == 0) |
| 5433 | return 1; |
| 5434 | |
| 5435 | /* If the PC is in __mips16_call_stub_{s,d}f_{0..10} but not at the start, |
| 5436 | i.e. after the jal instruction, this is effectively a return stub. */ |
| 5437 | if (strncmp (name, "__mips16_call_stub_", 19) == 0 |
| 5438 | && (name[19] == 's' || name[19] == 'd') && pc != start_addr) |
| 5439 | return 1; |
| 5440 | |
| 5441 | return 0; /* not a stub */ |
| 5442 | } |
| 5443 | |
| 5444 | |
| 5445 | /* Return non-zero if the PC is in a library helper function that |
| 5446 | should be ignored. This implements the |
| 5447 | DEPRECATED_IGNORE_HELPER_CALL macro. */ |
| 5448 | |
| 5449 | int |
| 5450 | mips_ignore_helper (CORE_ADDR pc) |
| 5451 | { |
| 5452 | char *name; |
| 5453 | |
| 5454 | /* Find the starting address and name of the function containing the PC. */ |
| 5455 | if (find_pc_partial_function (pc, &name, NULL, NULL) == 0) |
| 5456 | return 0; |
| 5457 | |
| 5458 | /* If the PC is in __mips16_ret_{d,s}f, this is a library helper function |
| 5459 | that we want to ignore. */ |
| 5460 | return (strcmp (name, "__mips16_ret_sf") == 0 |
| 5461 | || strcmp (name, "__mips16_ret_df") == 0); |
| 5462 | } |
| 5463 | |
| 5464 | |
| 5465 | /* Convert a dbx stab register number (from `r' declaration) to a GDB |
| 5466 | [1 * NUM_REGS .. 2 * NUM_REGS) REGNUM. */ |
| 5467 | |
| 5468 | static int |
| 5469 | mips_stab_reg_to_regnum (int num) |
| 5470 | { |
| 5471 | int regnum; |
| 5472 | if (num >= 0 && num < 32) |
| 5473 | regnum = num; |
| 5474 | else if (num >= 38 && num < 70) |
| 5475 | regnum = num + mips_regnum (current_gdbarch)->fp0 - 38; |
| 5476 | else if (num == 70) |
| 5477 | regnum = mips_regnum (current_gdbarch)->hi; |
| 5478 | else if (num == 71) |
| 5479 | regnum = mips_regnum (current_gdbarch)->lo; |
| 5480 | else |
| 5481 | /* This will hopefully (eventually) provoke a warning. Should |
| 5482 | we be calling complaint() here? */ |
| 5483 | return NUM_REGS + NUM_PSEUDO_REGS; |
| 5484 | return NUM_REGS + regnum; |
| 5485 | } |
| 5486 | |
| 5487 | |
| 5488 | /* Convert a dwarf, dwarf2, or ecoff register number to a GDB [1 * |
| 5489 | NUM_REGS .. 2 * NUM_REGS) REGNUM. */ |
| 5490 | |
| 5491 | static int |
| 5492 | mips_dwarf_dwarf2_ecoff_reg_to_regnum (int num) |
| 5493 | { |
| 5494 | int regnum; |
| 5495 | if (num >= 0 && num < 32) |
| 5496 | regnum = num; |
| 5497 | else if (num >= 32 && num < 64) |
| 5498 | regnum = num + mips_regnum (current_gdbarch)->fp0 - 32; |
| 5499 | else if (num == 64) |
| 5500 | regnum = mips_regnum (current_gdbarch)->hi; |
| 5501 | else if (num == 65) |
| 5502 | regnum = mips_regnum (current_gdbarch)->lo; |
| 5503 | else |
| 5504 | /* This will hopefully (eventually) provoke a warning. Should we |
| 5505 | be calling complaint() here? */ |
| 5506 | return NUM_REGS + NUM_PSEUDO_REGS; |
| 5507 | return NUM_REGS + regnum; |
| 5508 | } |
| 5509 | |
| 5510 | static int |
| 5511 | mips_register_sim_regno (int regnum) |
| 5512 | { |
| 5513 | /* Only makes sense to supply raw registers. */ |
| 5514 | gdb_assert (regnum >= 0 && regnum < NUM_REGS); |
| 5515 | /* FIXME: cagney/2002-05-13: Need to look at the pseudo register to |
| 5516 | decide if it is valid. Should instead define a standard sim/gdb |
| 5517 | register numbering scheme. */ |
| 5518 | if (REGISTER_NAME (NUM_REGS + regnum) != NULL |
| 5519 | && REGISTER_NAME (NUM_REGS + regnum)[0] != '\0') |
| 5520 | return regnum; |
| 5521 | else |
| 5522 | return LEGACY_SIM_REGNO_IGNORE; |
| 5523 | } |
| 5524 | |
| 5525 | |
| 5526 | /* Convert an integer into an address. By first converting the value |
| 5527 | into a pointer and then extracting it signed, the address is |
| 5528 | guarenteed to be correctly sign extended. */ |
| 5529 | |
| 5530 | static CORE_ADDR |
| 5531 | mips_integer_to_address (struct type *type, void *buf) |
| 5532 | { |
| 5533 | char *tmp = alloca (TYPE_LENGTH (builtin_type_void_data_ptr)); |
| 5534 | LONGEST val = unpack_long (type, buf); |
| 5535 | store_signed_integer (tmp, TYPE_LENGTH (builtin_type_void_data_ptr), val); |
| 5536 | return extract_signed_integer (tmp, |
| 5537 | TYPE_LENGTH (builtin_type_void_data_ptr)); |
| 5538 | } |
| 5539 | |
| 5540 | static void |
| 5541 | mips_find_abi_section (bfd *abfd, asection *sect, void *obj) |
| 5542 | { |
| 5543 | enum mips_abi *abip = (enum mips_abi *) obj; |
| 5544 | const char *name = bfd_get_section_name (abfd, sect); |
| 5545 | |
| 5546 | if (*abip != MIPS_ABI_UNKNOWN) |
| 5547 | return; |
| 5548 | |
| 5549 | if (strncmp (name, ".mdebug.", 8) != 0) |
| 5550 | return; |
| 5551 | |
| 5552 | if (strcmp (name, ".mdebug.abi32") == 0) |
| 5553 | *abip = MIPS_ABI_O32; |
| 5554 | else if (strcmp (name, ".mdebug.abiN32") == 0) |
| 5555 | *abip = MIPS_ABI_N32; |
| 5556 | else if (strcmp (name, ".mdebug.abi64") == 0) |
| 5557 | *abip = MIPS_ABI_N64; |
| 5558 | else if (strcmp (name, ".mdebug.abiO64") == 0) |
| 5559 | *abip = MIPS_ABI_O64; |
| 5560 | else if (strcmp (name, ".mdebug.eabi32") == 0) |
| 5561 | *abip = MIPS_ABI_EABI32; |
| 5562 | else if (strcmp (name, ".mdebug.eabi64") == 0) |
| 5563 | *abip = MIPS_ABI_EABI64; |
| 5564 | else |
| 5565 | warning ("unsupported ABI %s.", name + 8); |
| 5566 | } |
| 5567 | |
| 5568 | static enum mips_abi |
| 5569 | global_mips_abi (void) |
| 5570 | { |
| 5571 | int i; |
| 5572 | |
| 5573 | for (i = 0; mips_abi_strings[i] != NULL; i++) |
| 5574 | if (mips_abi_strings[i] == mips_abi_string) |
| 5575 | return (enum mips_abi) i; |
| 5576 | |
| 5577 | internal_error (__FILE__, __LINE__, "unknown ABI string"); |
| 5578 | } |
| 5579 | |
| 5580 | static struct gdbarch * |
| 5581 | mips_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 5582 | { |
| 5583 | struct gdbarch *gdbarch; |
| 5584 | struct gdbarch_tdep *tdep; |
| 5585 | int elf_flags; |
| 5586 | enum mips_abi mips_abi, found_abi, wanted_abi; |
| 5587 | int num_regs; |
| 5588 | enum mips_fpu_type fpu_type; |
| 5589 | |
| 5590 | /* First of all, extract the elf_flags, if available. */ |
| 5591 | if (info.abfd && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour) |
| 5592 | elf_flags = elf_elfheader (info.abfd)->e_flags; |
| 5593 | else if (arches != NULL) |
| 5594 | elf_flags = gdbarch_tdep (arches->gdbarch)->elf_flags; |
| 5595 | else |
| 5596 | elf_flags = 0; |
| 5597 | if (gdbarch_debug) |
| 5598 | fprintf_unfiltered (gdb_stdlog, |
| 5599 | "mips_gdbarch_init: elf_flags = 0x%08x\n", elf_flags); |
| 5600 | |
| 5601 | /* Check ELF_FLAGS to see if it specifies the ABI being used. */ |
| 5602 | switch ((elf_flags & EF_MIPS_ABI)) |
| 5603 | { |
| 5604 | case E_MIPS_ABI_O32: |
| 5605 | found_abi = MIPS_ABI_O32; |
| 5606 | break; |
| 5607 | case E_MIPS_ABI_O64: |
| 5608 | found_abi = MIPS_ABI_O64; |
| 5609 | break; |
| 5610 | case E_MIPS_ABI_EABI32: |
| 5611 | found_abi = MIPS_ABI_EABI32; |
| 5612 | break; |
| 5613 | case E_MIPS_ABI_EABI64: |
| 5614 | found_abi = MIPS_ABI_EABI64; |
| 5615 | break; |
| 5616 | default: |
| 5617 | if ((elf_flags & EF_MIPS_ABI2)) |
| 5618 | found_abi = MIPS_ABI_N32; |
| 5619 | else |
| 5620 | found_abi = MIPS_ABI_UNKNOWN; |
| 5621 | break; |
| 5622 | } |
| 5623 | |
| 5624 | /* GCC creates a pseudo-section whose name describes the ABI. */ |
| 5625 | if (found_abi == MIPS_ABI_UNKNOWN && info.abfd != NULL) |
| 5626 | bfd_map_over_sections (info.abfd, mips_find_abi_section, &found_abi); |
| 5627 | |
| 5628 | /* If we have no useful BFD information, use the ABI from the last |
| 5629 | MIPS architecture (if there is one). */ |
| 5630 | if (found_abi == MIPS_ABI_UNKNOWN && info.abfd == NULL && arches != NULL) |
| 5631 | found_abi = gdbarch_tdep (arches->gdbarch)->found_abi; |
| 5632 | |
| 5633 | /* Try the architecture for any hint of the correct ABI. */ |
| 5634 | if (found_abi == MIPS_ABI_UNKNOWN |
| 5635 | && info.bfd_arch_info != NULL |
| 5636 | && info.bfd_arch_info->arch == bfd_arch_mips) |
| 5637 | { |
| 5638 | switch (info.bfd_arch_info->mach) |
| 5639 | { |
| 5640 | case bfd_mach_mips3900: |
| 5641 | found_abi = MIPS_ABI_EABI32; |
| 5642 | break; |
| 5643 | case bfd_mach_mips4100: |
| 5644 | case bfd_mach_mips5000: |
| 5645 | found_abi = MIPS_ABI_EABI64; |
| 5646 | break; |
| 5647 | case bfd_mach_mips8000: |
| 5648 | case bfd_mach_mips10000: |
| 5649 | /* On Irix, ELF64 executables use the N64 ABI. The |
| 5650 | pseudo-sections which describe the ABI aren't present |
| 5651 | on IRIX. (Even for executables created by gcc.) */ |
| 5652 | if (bfd_get_flavour (info.abfd) == bfd_target_elf_flavour |
| 5653 | && elf_elfheader (info.abfd)->e_ident[EI_CLASS] == ELFCLASS64) |
| 5654 | found_abi = MIPS_ABI_N64; |
| 5655 | else |
| 5656 | found_abi = MIPS_ABI_N32; |
| 5657 | break; |
| 5658 | } |
| 5659 | } |
| 5660 | |
| 5661 | if (gdbarch_debug) |
| 5662 | fprintf_unfiltered (gdb_stdlog, "mips_gdbarch_init: found_abi = %d\n", |
| 5663 | found_abi); |
| 5664 | |
| 5665 | /* What has the user specified from the command line? */ |
| 5666 | wanted_abi = global_mips_abi (); |
| 5667 | if (gdbarch_debug) |
| 5668 | fprintf_unfiltered (gdb_stdlog, "mips_gdbarch_init: wanted_abi = %d\n", |
| 5669 | wanted_abi); |
| 5670 | |
| 5671 | /* Now that we have found what the ABI for this binary would be, |
| 5672 | check whether the user is overriding it. */ |
| 5673 | if (wanted_abi != MIPS_ABI_UNKNOWN) |
| 5674 | mips_abi = wanted_abi; |
| 5675 | else if (found_abi != MIPS_ABI_UNKNOWN) |
| 5676 | mips_abi = found_abi; |
| 5677 | else |
| 5678 | mips_abi = MIPS_ABI_O32; |
| 5679 | if (gdbarch_debug) |
| 5680 | fprintf_unfiltered (gdb_stdlog, "mips_gdbarch_init: mips_abi = %d\n", |
| 5681 | mips_abi); |
| 5682 | |
| 5683 | /* Also used when doing an architecture lookup. */ |
| 5684 | if (gdbarch_debug) |
| 5685 | fprintf_unfiltered (gdb_stdlog, |
| 5686 | "mips_gdbarch_init: mips64_transfers_32bit_regs_p = %d\n", |
| 5687 | mips64_transfers_32bit_regs_p); |
| 5688 | |
| 5689 | /* Determine the MIPS FPU type. */ |
| 5690 | if (!mips_fpu_type_auto) |
| 5691 | fpu_type = mips_fpu_type; |
| 5692 | else if (info.bfd_arch_info != NULL |
| 5693 | && info.bfd_arch_info->arch == bfd_arch_mips) |
| 5694 | switch (info.bfd_arch_info->mach) |
| 5695 | { |
| 5696 | case bfd_mach_mips3900: |
| 5697 | case bfd_mach_mips4100: |
| 5698 | case bfd_mach_mips4111: |
| 5699 | case bfd_mach_mips4120: |
| 5700 | fpu_type = MIPS_FPU_NONE; |
| 5701 | break; |
| 5702 | case bfd_mach_mips4650: |
| 5703 | fpu_type = MIPS_FPU_SINGLE; |
| 5704 | break; |
| 5705 | default: |
| 5706 | fpu_type = MIPS_FPU_DOUBLE; |
| 5707 | break; |
| 5708 | } |
| 5709 | else if (arches != NULL) |
| 5710 | fpu_type = gdbarch_tdep (arches->gdbarch)->mips_fpu_type; |
| 5711 | else |
| 5712 | fpu_type = MIPS_FPU_DOUBLE; |
| 5713 | if (gdbarch_debug) |
| 5714 | fprintf_unfiltered (gdb_stdlog, |
| 5715 | "mips_gdbarch_init: fpu_type = %d\n", fpu_type); |
| 5716 | |
| 5717 | /* try to find a pre-existing architecture */ |
| 5718 | for (arches = gdbarch_list_lookup_by_info (arches, &info); |
| 5719 | arches != NULL; |
| 5720 | arches = gdbarch_list_lookup_by_info (arches->next, &info)) |
| 5721 | { |
| 5722 | /* MIPS needs to be pedantic about which ABI the object is |
| 5723 | using. */ |
| 5724 | if (gdbarch_tdep (arches->gdbarch)->elf_flags != elf_flags) |
| 5725 | continue; |
| 5726 | if (gdbarch_tdep (arches->gdbarch)->mips_abi != mips_abi) |
| 5727 | continue; |
| 5728 | /* Need to be pedantic about which register virtual size is |
| 5729 | used. */ |
| 5730 | if (gdbarch_tdep (arches->gdbarch)->mips64_transfers_32bit_regs_p |
| 5731 | != mips64_transfers_32bit_regs_p) |
| 5732 | continue; |
| 5733 | /* Be pedantic about which FPU is selected. */ |
| 5734 | if (gdbarch_tdep (arches->gdbarch)->mips_fpu_type != fpu_type) |
| 5735 | continue; |
| 5736 | return arches->gdbarch; |
| 5737 | } |
| 5738 | |
| 5739 | /* Need a new architecture. Fill in a target specific vector. */ |
| 5740 | tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep)); |
| 5741 | gdbarch = gdbarch_alloc (&info, tdep); |
| 5742 | tdep->elf_flags = elf_flags; |
| 5743 | tdep->mips64_transfers_32bit_regs_p = mips64_transfers_32bit_regs_p; |
| 5744 | tdep->found_abi = found_abi; |
| 5745 | tdep->mips_abi = mips_abi; |
| 5746 | tdep->mips_fpu_type = fpu_type; |
| 5747 | |
| 5748 | /* Initially set everything according to the default ABI/ISA. */ |
| 5749 | set_gdbarch_short_bit (gdbarch, 16); |
| 5750 | set_gdbarch_int_bit (gdbarch, 32); |
| 5751 | set_gdbarch_float_bit (gdbarch, 32); |
| 5752 | set_gdbarch_double_bit (gdbarch, 64); |
| 5753 | set_gdbarch_long_double_bit (gdbarch, 64); |
| 5754 | set_gdbarch_register_reggroup_p (gdbarch, mips_register_reggroup_p); |
| 5755 | set_gdbarch_pseudo_register_read (gdbarch, mips_pseudo_register_read); |
| 5756 | set_gdbarch_pseudo_register_write (gdbarch, mips_pseudo_register_write); |
| 5757 | |
| 5758 | set_gdbarch_elf_make_msymbol_special (gdbarch, |
| 5759 | mips_elf_make_msymbol_special); |
| 5760 | |
| 5761 | /* Fill in the OS dependant register numbers and names. */ |
| 5762 | { |
| 5763 | const char **reg_names; |
| 5764 | struct mips_regnum *regnum = GDBARCH_OBSTACK_ZALLOC (gdbarch, |
| 5765 | struct mips_regnum); |
| 5766 | if (info.osabi == GDB_OSABI_IRIX) |
| 5767 | { |
| 5768 | regnum->fp0 = 32; |
| 5769 | regnum->pc = 64; |
| 5770 | regnum->cause = 65; |
| 5771 | regnum->badvaddr = 66; |
| 5772 | regnum->hi = 67; |
| 5773 | regnum->lo = 68; |
| 5774 | regnum->fp_control_status = 69; |
| 5775 | regnum->fp_implementation_revision = 70; |
| 5776 | num_regs = 71; |
| 5777 | reg_names = mips_irix_reg_names; |
| 5778 | } |
| 5779 | else |
| 5780 | { |
| 5781 | regnum->lo = MIPS_EMBED_LO_REGNUM; |
| 5782 | regnum->hi = MIPS_EMBED_HI_REGNUM; |
| 5783 | regnum->badvaddr = MIPS_EMBED_BADVADDR_REGNUM; |
| 5784 | regnum->cause = MIPS_EMBED_CAUSE_REGNUM; |
| 5785 | regnum->pc = MIPS_EMBED_PC_REGNUM; |
| 5786 | regnum->fp0 = MIPS_EMBED_FP0_REGNUM; |
| 5787 | regnum->fp_control_status = 70; |
| 5788 | regnum->fp_implementation_revision = 71; |
| 5789 | num_regs = 90; |
| 5790 | if (info.bfd_arch_info != NULL |
| 5791 | && info.bfd_arch_info->mach == bfd_mach_mips3900) |
| 5792 | reg_names = mips_tx39_reg_names; |
| 5793 | else |
| 5794 | reg_names = mips_generic_reg_names; |
| 5795 | } |
| 5796 | /* FIXME: cagney/2003-11-15: For MIPS, hasn't PC_REGNUM been |
| 5797 | replaced by read_pc? */ |
| 5798 | set_gdbarch_pc_regnum (gdbarch, regnum->pc + num_regs); |
| 5799 | set_gdbarch_sp_regnum (gdbarch, MIPS_SP_REGNUM + num_regs); |
| 5800 | set_gdbarch_fp0_regnum (gdbarch, regnum->fp0); |
| 5801 | set_gdbarch_num_regs (gdbarch, num_regs); |
| 5802 | set_gdbarch_num_pseudo_regs (gdbarch, num_regs); |
| 5803 | set_gdbarch_register_name (gdbarch, mips_register_name); |
| 5804 | tdep->mips_processor_reg_names = reg_names; |
| 5805 | tdep->regnum = regnum; |
| 5806 | } |
| 5807 | |
| 5808 | switch (mips_abi) |
| 5809 | { |
| 5810 | case MIPS_ABI_O32: |
| 5811 | set_gdbarch_push_dummy_call (gdbarch, mips_o32_push_dummy_call); |
| 5812 | set_gdbarch_return_value (gdbarch, mips_o32_return_value); |
| 5813 | tdep->mips_last_arg_regnum = A0_REGNUM + 4 - 1; |
| 5814 | tdep->mips_last_fp_arg_regnum = tdep->regnum->fp0 + 12 + 4 - 1; |
| 5815 | tdep->default_mask_address_p = 0; |
| 5816 | set_gdbarch_long_bit (gdbarch, 32); |
| 5817 | set_gdbarch_ptr_bit (gdbarch, 32); |
| 5818 | set_gdbarch_long_long_bit (gdbarch, 64); |
| 5819 | break; |
| 5820 | case MIPS_ABI_O64: |
| 5821 | set_gdbarch_push_dummy_call (gdbarch, mips_o64_push_dummy_call); |
| 5822 | set_gdbarch_deprecated_store_return_value (gdbarch, |
| 5823 | mips_o64_store_return_value); |
| 5824 | set_gdbarch_deprecated_extract_return_value (gdbarch, |
| 5825 | mips_o64_extract_return_value); |
| 5826 | tdep->mips_last_arg_regnum = A0_REGNUM + 4 - 1; |
| 5827 | tdep->mips_last_fp_arg_regnum = tdep->regnum->fp0 + 12 + 4 - 1; |
| 5828 | tdep->default_mask_address_p = 0; |
| 5829 | set_gdbarch_long_bit (gdbarch, 32); |
| 5830 | set_gdbarch_ptr_bit (gdbarch, 32); |
| 5831 | set_gdbarch_long_long_bit (gdbarch, 64); |
| 5832 | set_gdbarch_deprecated_use_struct_convention (gdbarch, always_use_struct_convention); |
| 5833 | break; |
| 5834 | case MIPS_ABI_EABI32: |
| 5835 | set_gdbarch_push_dummy_call (gdbarch, mips_eabi_push_dummy_call); |
| 5836 | set_gdbarch_deprecated_store_return_value (gdbarch, |
| 5837 | mips_eabi_store_return_value); |
| 5838 | set_gdbarch_deprecated_extract_return_value (gdbarch, |
| 5839 | mips_eabi_extract_return_value); |
| 5840 | tdep->mips_last_arg_regnum = A0_REGNUM + 8 - 1; |
| 5841 | tdep->mips_last_fp_arg_regnum = tdep->regnum->fp0 + 12 + 8 - 1; |
| 5842 | tdep->default_mask_address_p = 0; |
| 5843 | set_gdbarch_long_bit (gdbarch, 32); |
| 5844 | set_gdbarch_ptr_bit (gdbarch, 32); |
| 5845 | set_gdbarch_long_long_bit (gdbarch, 64); |
| 5846 | set_gdbarch_deprecated_reg_struct_has_addr |
| 5847 | (gdbarch, mips_eabi_reg_struct_has_addr); |
| 5848 | set_gdbarch_deprecated_use_struct_convention (gdbarch, mips_eabi_use_struct_convention); |
| 5849 | break; |
| 5850 | case MIPS_ABI_EABI64: |
| 5851 | set_gdbarch_push_dummy_call (gdbarch, mips_eabi_push_dummy_call); |
| 5852 | set_gdbarch_deprecated_store_return_value (gdbarch, |
| 5853 | mips_eabi_store_return_value); |
| 5854 | set_gdbarch_deprecated_extract_return_value (gdbarch, |
| 5855 | mips_eabi_extract_return_value); |
| 5856 | tdep->mips_last_arg_regnum = A0_REGNUM + 8 - 1; |
| 5857 | tdep->mips_last_fp_arg_regnum = tdep->regnum->fp0 + 12 + 8 - 1; |
| 5858 | tdep->default_mask_address_p = 0; |
| 5859 | set_gdbarch_long_bit (gdbarch, 64); |
| 5860 | set_gdbarch_ptr_bit (gdbarch, 64); |
| 5861 | set_gdbarch_long_long_bit (gdbarch, 64); |
| 5862 | set_gdbarch_deprecated_reg_struct_has_addr |
| 5863 | (gdbarch, mips_eabi_reg_struct_has_addr); |
| 5864 | set_gdbarch_deprecated_use_struct_convention (gdbarch, mips_eabi_use_struct_convention); |
| 5865 | break; |
| 5866 | case MIPS_ABI_N32: |
| 5867 | set_gdbarch_push_dummy_call (gdbarch, mips_n32n64_push_dummy_call); |
| 5868 | set_gdbarch_return_value (gdbarch, mips_n32n64_return_value); |
| 5869 | tdep->mips_last_arg_regnum = A0_REGNUM + 8 - 1; |
| 5870 | tdep->mips_last_fp_arg_regnum = tdep->regnum->fp0 + 12 + 8 - 1; |
| 5871 | tdep->default_mask_address_p = 0; |
| 5872 | set_gdbarch_long_bit (gdbarch, 32); |
| 5873 | set_gdbarch_ptr_bit (gdbarch, 32); |
| 5874 | set_gdbarch_long_long_bit (gdbarch, 64); |
| 5875 | set_gdbarch_long_double_bit (gdbarch, 128); |
| 5876 | set_gdbarch_long_double_format (gdbarch, |
| 5877 | &floatformat_n32n64_long_double_big); |
| 5878 | break; |
| 5879 | case MIPS_ABI_N64: |
| 5880 | set_gdbarch_push_dummy_call (gdbarch, mips_n32n64_push_dummy_call); |
| 5881 | set_gdbarch_return_value (gdbarch, mips_n32n64_return_value); |
| 5882 | tdep->mips_last_arg_regnum = A0_REGNUM + 8 - 1; |
| 5883 | tdep->mips_last_fp_arg_regnum = tdep->regnum->fp0 + 12 + 8 - 1; |
| 5884 | tdep->default_mask_address_p = 0; |
| 5885 | set_gdbarch_long_bit (gdbarch, 64); |
| 5886 | set_gdbarch_ptr_bit (gdbarch, 64); |
| 5887 | set_gdbarch_long_long_bit (gdbarch, 64); |
| 5888 | set_gdbarch_long_double_bit (gdbarch, 128); |
| 5889 | set_gdbarch_long_double_format (gdbarch, |
| 5890 | &floatformat_n32n64_long_double_big); |
| 5891 | break; |
| 5892 | default: |
| 5893 | internal_error (__FILE__, __LINE__, "unknown ABI in switch"); |
| 5894 | } |
| 5895 | |
| 5896 | /* FIXME: jlarmour/2000-04-07: There *is* a flag EF_MIPS_32BIT_MODE |
| 5897 | that could indicate -gp32 BUT gas/config/tc-mips.c contains the |
| 5898 | comment: |
| 5899 | |
| 5900 | ``We deliberately don't allow "-gp32" to set the MIPS_32BITMODE |
| 5901 | flag in object files because to do so would make it impossible to |
| 5902 | link with libraries compiled without "-gp32". This is |
| 5903 | unnecessarily restrictive. |
| 5904 | |
| 5905 | We could solve this problem by adding "-gp32" multilibs to gcc, |
| 5906 | but to set this flag before gcc is built with such multilibs will |
| 5907 | break too many systems.'' |
| 5908 | |
| 5909 | But even more unhelpfully, the default linker output target for |
| 5910 | mips64-elf is elf32-bigmips, and has EF_MIPS_32BIT_MODE set, even |
| 5911 | for 64-bit programs - you need to change the ABI to change this, |
| 5912 | and not all gcc targets support that currently. Therefore using |
| 5913 | this flag to detect 32-bit mode would do the wrong thing given |
| 5914 | the current gcc - it would make GDB treat these 64-bit programs |
| 5915 | as 32-bit programs by default. */ |
| 5916 | |
| 5917 | set_gdbarch_read_pc (gdbarch, mips_read_pc); |
| 5918 | set_gdbarch_write_pc (gdbarch, mips_write_pc); |
| 5919 | set_gdbarch_read_sp (gdbarch, mips_read_sp); |
| 5920 | |
| 5921 | /* Add/remove bits from an address. The MIPS needs be careful to |
| 5922 | ensure that all 32 bit addresses are sign extended to 64 bits. */ |
| 5923 | set_gdbarch_addr_bits_remove (gdbarch, mips_addr_bits_remove); |
| 5924 | |
| 5925 | /* Unwind the frame. */ |
| 5926 | set_gdbarch_unwind_pc (gdbarch, mips_unwind_pc); |
| 5927 | set_gdbarch_unwind_dummy_id (gdbarch, mips_unwind_dummy_id); |
| 5928 | |
| 5929 | /* Map debug register numbers onto internal register numbers. */ |
| 5930 | set_gdbarch_stab_reg_to_regnum (gdbarch, mips_stab_reg_to_regnum); |
| 5931 | set_gdbarch_ecoff_reg_to_regnum (gdbarch, |
| 5932 | mips_dwarf_dwarf2_ecoff_reg_to_regnum); |
| 5933 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, |
| 5934 | mips_dwarf_dwarf2_ecoff_reg_to_regnum); |
| 5935 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, |
| 5936 | mips_dwarf_dwarf2_ecoff_reg_to_regnum); |
| 5937 | set_gdbarch_register_sim_regno (gdbarch, mips_register_sim_regno); |
| 5938 | |
| 5939 | /* MIPS version of CALL_DUMMY */ |
| 5940 | |
| 5941 | /* NOTE: cagney/2003-08-05: Eventually call dummy location will be |
| 5942 | replaced by a command, and all targets will default to on stack |
| 5943 | (regardless of the stack's execute status). */ |
| 5944 | set_gdbarch_call_dummy_location (gdbarch, AT_SYMBOL); |
| 5945 | set_gdbarch_frame_align (gdbarch, mips_frame_align); |
| 5946 | |
| 5947 | set_gdbarch_convert_register_p (gdbarch, mips_convert_register_p); |
| 5948 | set_gdbarch_register_to_value (gdbarch, mips_register_to_value); |
| 5949 | set_gdbarch_value_to_register (gdbarch, mips_value_to_register); |
| 5950 | |
| 5951 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 5952 | set_gdbarch_breakpoint_from_pc (gdbarch, mips_breakpoint_from_pc); |
| 5953 | |
| 5954 | set_gdbarch_skip_prologue (gdbarch, mips_skip_prologue); |
| 5955 | |
| 5956 | set_gdbarch_pointer_to_address (gdbarch, signed_pointer_to_address); |
| 5957 | set_gdbarch_address_to_pointer (gdbarch, address_to_signed_pointer); |
| 5958 | set_gdbarch_integer_to_address (gdbarch, mips_integer_to_address); |
| 5959 | |
| 5960 | set_gdbarch_register_type (gdbarch, mips_register_type); |
| 5961 | |
| 5962 | set_gdbarch_print_registers_info (gdbarch, mips_print_registers_info); |
| 5963 | |
| 5964 | set_gdbarch_print_insn (gdbarch, gdb_print_insn_mips); |
| 5965 | |
| 5966 | /* FIXME: cagney/2003-08-29: The macros HAVE_STEPPABLE_WATCHPOINT, |
| 5967 | HAVE_NONSTEPPABLE_WATCHPOINT, and HAVE_CONTINUABLE_WATCHPOINT |
| 5968 | need to all be folded into the target vector. Since they are |
| 5969 | being used as guards for STOPPED_BY_WATCHPOINT, why not have |
| 5970 | STOPPED_BY_WATCHPOINT return the type of watchpoint that the code |
| 5971 | is sitting on? */ |
| 5972 | set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1); |
| 5973 | |
| 5974 | set_gdbarch_skip_trampoline_code (gdbarch, mips_skip_stub); |
| 5975 | |
| 5976 | /* NOTE drow/2004-02-11: We overload the core solib trampoline code |
| 5977 | to support MIPS16. This is a bad thing. Make sure not to do it |
| 5978 | if we have an OS ABI that actually supports shared libraries, since |
| 5979 | shared library support is more important. If we have an OS someday |
| 5980 | that supports both shared libraries and MIPS16, we'll have to find |
| 5981 | a better place for these. */ |
| 5982 | if (info.osabi == GDB_OSABI_UNKNOWN) |
| 5983 | { |
| 5984 | set_gdbarch_in_solib_call_trampoline (gdbarch, mips_in_call_stub); |
| 5985 | set_gdbarch_in_solib_return_trampoline (gdbarch, mips_in_return_stub); |
| 5986 | } |
| 5987 | |
| 5988 | /* Hook in OS ABI-specific overrides, if they have been registered. */ |
| 5989 | gdbarch_init_osabi (info, gdbarch); |
| 5990 | |
| 5991 | /* Unwind the frame. */ |
| 5992 | frame_unwind_append_sniffer (gdbarch, mips_stub_frame_sniffer); |
| 5993 | frame_unwind_append_sniffer (gdbarch, mips_mdebug_frame_sniffer); |
| 5994 | frame_unwind_append_sniffer (gdbarch, mips_insn16_frame_sniffer); |
| 5995 | frame_unwind_append_sniffer (gdbarch, mips_insn32_frame_sniffer); |
| 5996 | frame_base_append_sniffer (gdbarch, mips_stub_frame_base_sniffer); |
| 5997 | frame_base_append_sniffer (gdbarch, mips_mdebug_frame_base_sniffer); |
| 5998 | frame_base_append_sniffer (gdbarch, mips_insn16_frame_base_sniffer); |
| 5999 | frame_base_append_sniffer (gdbarch, mips_insn32_frame_base_sniffer); |
| 6000 | |
| 6001 | return gdbarch; |
| 6002 | } |
| 6003 | |
| 6004 | static void |
| 6005 | mips_abi_update (char *ignore_args, int from_tty, struct cmd_list_element *c) |
| 6006 | { |
| 6007 | struct gdbarch_info info; |
| 6008 | |
| 6009 | /* Force the architecture to update, and (if it's a MIPS architecture) |
| 6010 | mips_gdbarch_init will take care of the rest. */ |
| 6011 | gdbarch_info_init (&info); |
| 6012 | gdbarch_update_p (info); |
| 6013 | } |
| 6014 | |
| 6015 | /* Print out which MIPS ABI is in use. */ |
| 6016 | |
| 6017 | static void |
| 6018 | show_mips_abi (char *ignore_args, int from_tty) |
| 6019 | { |
| 6020 | if (gdbarch_bfd_arch_info (current_gdbarch)->arch != bfd_arch_mips) |
| 6021 | printf_filtered |
| 6022 | ("The MIPS ABI is unknown because the current architecture is not MIPS.\n"); |
| 6023 | else |
| 6024 | { |
| 6025 | enum mips_abi global_abi = global_mips_abi (); |
| 6026 | enum mips_abi actual_abi = mips_abi (current_gdbarch); |
| 6027 | const char *actual_abi_str = mips_abi_strings[actual_abi]; |
| 6028 | |
| 6029 | if (global_abi == MIPS_ABI_UNKNOWN) |
| 6030 | printf_filtered |
| 6031 | ("The MIPS ABI is set automatically (currently \"%s\").\n", |
| 6032 | actual_abi_str); |
| 6033 | else if (global_abi == actual_abi) |
| 6034 | printf_filtered |
| 6035 | ("The MIPS ABI is assumed to be \"%s\" (due to user setting).\n", |
| 6036 | actual_abi_str); |
| 6037 | else |
| 6038 | { |
| 6039 | /* Probably shouldn't happen... */ |
| 6040 | printf_filtered |
| 6041 | ("The (auto detected) MIPS ABI \"%s\" is in use even though the user setting was \"%s\".\n", |
| 6042 | actual_abi_str, mips_abi_strings[global_abi]); |
| 6043 | } |
| 6044 | } |
| 6045 | } |
| 6046 | |
| 6047 | static void |
| 6048 | mips_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) |
| 6049 | { |
| 6050 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 6051 | if (tdep != NULL) |
| 6052 | { |
| 6053 | int ef_mips_arch; |
| 6054 | int ef_mips_32bitmode; |
| 6055 | /* determine the ISA */ |
| 6056 | switch (tdep->elf_flags & EF_MIPS_ARCH) |
| 6057 | { |
| 6058 | case E_MIPS_ARCH_1: |
| 6059 | ef_mips_arch = 1; |
| 6060 | break; |
| 6061 | case E_MIPS_ARCH_2: |
| 6062 | ef_mips_arch = 2; |
| 6063 | break; |
| 6064 | case E_MIPS_ARCH_3: |
| 6065 | ef_mips_arch = 3; |
| 6066 | break; |
| 6067 | case E_MIPS_ARCH_4: |
| 6068 | ef_mips_arch = 4; |
| 6069 | break; |
| 6070 | default: |
| 6071 | ef_mips_arch = 0; |
| 6072 | break; |
| 6073 | } |
| 6074 | /* determine the size of a pointer */ |
| 6075 | ef_mips_32bitmode = (tdep->elf_flags & EF_MIPS_32BITMODE); |
| 6076 | fprintf_unfiltered (file, |
| 6077 | "mips_dump_tdep: tdep->elf_flags = 0x%x\n", |
| 6078 | tdep->elf_flags); |
| 6079 | fprintf_unfiltered (file, |
| 6080 | "mips_dump_tdep: ef_mips_32bitmode = %d\n", |
| 6081 | ef_mips_32bitmode); |
| 6082 | fprintf_unfiltered (file, |
| 6083 | "mips_dump_tdep: ef_mips_arch = %d\n", |
| 6084 | ef_mips_arch); |
| 6085 | fprintf_unfiltered (file, |
| 6086 | "mips_dump_tdep: tdep->mips_abi = %d (%s)\n", |
| 6087 | tdep->mips_abi, mips_abi_strings[tdep->mips_abi]); |
| 6088 | fprintf_unfiltered (file, |
| 6089 | "mips_dump_tdep: mips_mask_address_p() %d (default %d)\n", |
| 6090 | mips_mask_address_p (tdep), |
| 6091 | tdep->default_mask_address_p); |
| 6092 | } |
| 6093 | fprintf_unfiltered (file, |
| 6094 | "mips_dump_tdep: MIPS_DEFAULT_FPU_TYPE = %d (%s)\n", |
| 6095 | MIPS_DEFAULT_FPU_TYPE, |
| 6096 | (MIPS_DEFAULT_FPU_TYPE == MIPS_FPU_NONE ? "none" |
| 6097 | : MIPS_DEFAULT_FPU_TYPE == MIPS_FPU_SINGLE ? "single" |
| 6098 | : MIPS_DEFAULT_FPU_TYPE == MIPS_FPU_DOUBLE ? "double" |
| 6099 | : "???")); |
| 6100 | fprintf_unfiltered (file, "mips_dump_tdep: MIPS_EABI = %d\n", MIPS_EABI); |
| 6101 | fprintf_unfiltered (file, |
| 6102 | "mips_dump_tdep: MIPS_FPU_TYPE = %d (%s)\n", |
| 6103 | MIPS_FPU_TYPE, |
| 6104 | (MIPS_FPU_TYPE == MIPS_FPU_NONE ? "none" |
| 6105 | : MIPS_FPU_TYPE == MIPS_FPU_SINGLE ? "single" |
| 6106 | : MIPS_FPU_TYPE == MIPS_FPU_DOUBLE ? "double" |
| 6107 | : "???")); |
| 6108 | fprintf_unfiltered (file, |
| 6109 | "mips_dump_tdep: mips_stack_argsize() = %d\n", |
| 6110 | mips_stack_argsize (current_gdbarch)); |
| 6111 | fprintf_unfiltered (file, "mips_dump_tdep: A0_REGNUM = %d\n", A0_REGNUM); |
| 6112 | fprintf_unfiltered (file, |
| 6113 | "mips_dump_tdep: ADDR_BITS_REMOVE # %s\n", |
| 6114 | XSTRING (ADDR_BITS_REMOVE (ADDR))); |
| 6115 | fprintf_unfiltered (file, |
| 6116 | "mips_dump_tdep: ATTACH_DETACH # %s\n", |
| 6117 | XSTRING (ATTACH_DETACH)); |
| 6118 | fprintf_unfiltered (file, |
| 6119 | "mips_dump_tdep: DWARF_REG_TO_REGNUM # %s\n", |
| 6120 | XSTRING (DWARF_REG_TO_REGNUM (REGNUM))); |
| 6121 | fprintf_unfiltered (file, |
| 6122 | "mips_dump_tdep: ECOFF_REG_TO_REGNUM # %s\n", |
| 6123 | XSTRING (ECOFF_REG_TO_REGNUM (REGNUM))); |
| 6124 | fprintf_unfiltered (file, |
| 6125 | "mips_dump_tdep: FIRST_EMBED_REGNUM = %d\n", |
| 6126 | FIRST_EMBED_REGNUM); |
| 6127 | fprintf_unfiltered (file, |
| 6128 | "mips_dump_tdep: DEPRECATED_IGNORE_HELPER_CALL # %s\n", |
| 6129 | XSTRING (DEPRECATED_IGNORE_HELPER_CALL (PC))); |
| 6130 | fprintf_unfiltered (file, |
| 6131 | "mips_dump_tdep: IN_SOLIB_CALL_TRAMPOLINE # %s\n", |
| 6132 | XSTRING (IN_SOLIB_CALL_TRAMPOLINE (PC, NAME))); |
| 6133 | fprintf_unfiltered (file, |
| 6134 | "mips_dump_tdep: IN_SOLIB_RETURN_TRAMPOLINE # %s\n", |
| 6135 | XSTRING (IN_SOLIB_RETURN_TRAMPOLINE (PC, NAME))); |
| 6136 | fprintf_unfiltered (file, |
| 6137 | "mips_dump_tdep: LAST_EMBED_REGNUM = %d\n", |
| 6138 | LAST_EMBED_REGNUM); |
| 6139 | #ifdef MACHINE_CPROC_FP_OFFSET |
| 6140 | fprintf_unfiltered (file, |
| 6141 | "mips_dump_tdep: MACHINE_CPROC_FP_OFFSET = %d\n", |
| 6142 | MACHINE_CPROC_FP_OFFSET); |
| 6143 | #endif |
| 6144 | #ifdef MACHINE_CPROC_PC_OFFSET |
| 6145 | fprintf_unfiltered (file, |
| 6146 | "mips_dump_tdep: MACHINE_CPROC_PC_OFFSET = %d\n", |
| 6147 | MACHINE_CPROC_PC_OFFSET); |
| 6148 | #endif |
| 6149 | #ifdef MACHINE_CPROC_SP_OFFSET |
| 6150 | fprintf_unfiltered (file, |
| 6151 | "mips_dump_tdep: MACHINE_CPROC_SP_OFFSET = %d\n", |
| 6152 | MACHINE_CPROC_SP_OFFSET); |
| 6153 | #endif |
| 6154 | fprintf_unfiltered (file, |
| 6155 | "mips_dump_tdep: MIPS16_INSTLEN = %d\n", |
| 6156 | MIPS16_INSTLEN); |
| 6157 | fprintf_unfiltered (file, "mips_dump_tdep: MIPS_DEFAULT_ABI = FIXME!\n"); |
| 6158 | fprintf_unfiltered (file, |
| 6159 | "mips_dump_tdep: MIPS_EFI_SYMBOL_NAME = multi-arch!!\n"); |
| 6160 | fprintf_unfiltered (file, |
| 6161 | "mips_dump_tdep: MIPS_INSTLEN = %d\n", MIPS_INSTLEN); |
| 6162 | fprintf_unfiltered (file, |
| 6163 | "mips_dump_tdep: MIPS_LAST_ARG_REGNUM = %d (%d regs)\n", |
| 6164 | MIPS_LAST_ARG_REGNUM, |
| 6165 | MIPS_LAST_ARG_REGNUM - A0_REGNUM + 1); |
| 6166 | fprintf_unfiltered (file, |
| 6167 | "mips_dump_tdep: MIPS_NUMREGS = %d\n", MIPS_NUMREGS); |
| 6168 | fprintf_unfiltered (file, |
| 6169 | "mips_dump_tdep: mips_abi_regsize() = %d\n", |
| 6170 | mips_abi_regsize (current_gdbarch)); |
| 6171 | fprintf_unfiltered (file, |
| 6172 | "mips_dump_tdep: PRID_REGNUM = %d\n", PRID_REGNUM); |
| 6173 | fprintf_unfiltered (file, |
| 6174 | "mips_dump_tdep: PROC_FRAME_ADJUST = function?\n"); |
| 6175 | fprintf_unfiltered (file, |
| 6176 | "mips_dump_tdep: PROC_FRAME_OFFSET = function?\n"); |
| 6177 | fprintf_unfiltered (file, "mips_dump_tdep: PROC_FRAME_REG = function?\n"); |
| 6178 | fprintf_unfiltered (file, "mips_dump_tdep: PROC_FREG_MASK = function?\n"); |
| 6179 | fprintf_unfiltered (file, "mips_dump_tdep: PROC_FREG_OFFSET = function?\n"); |
| 6180 | fprintf_unfiltered (file, "mips_dump_tdep: PROC_HIGH_ADDR = function?\n"); |
| 6181 | fprintf_unfiltered (file, "mips_dump_tdep: PROC_LOW_ADDR = function?\n"); |
| 6182 | fprintf_unfiltered (file, "mips_dump_tdep: PROC_PC_REG = function?\n"); |
| 6183 | fprintf_unfiltered (file, "mips_dump_tdep: PROC_REG_MASK = function?\n"); |
| 6184 | fprintf_unfiltered (file, "mips_dump_tdep: PROC_REG_OFFSET = function?\n"); |
| 6185 | fprintf_unfiltered (file, "mips_dump_tdep: PROC_SYMBOL = function?\n"); |
| 6186 | fprintf_unfiltered (file, "mips_dump_tdep: PS_REGNUM = %d\n", PS_REGNUM); |
| 6187 | fprintf_unfiltered (file, "mips_dump_tdep: RA_REGNUM = %d\n", RA_REGNUM); |
| 6188 | #ifdef SAVED_BYTES |
| 6189 | fprintf_unfiltered (file, |
| 6190 | "mips_dump_tdep: SAVED_BYTES = %d\n", SAVED_BYTES); |
| 6191 | #endif |
| 6192 | #ifdef SAVED_FP |
| 6193 | fprintf_unfiltered (file, "mips_dump_tdep: SAVED_FP = %d\n", SAVED_FP); |
| 6194 | #endif |
| 6195 | #ifdef SAVED_PC |
| 6196 | fprintf_unfiltered (file, "mips_dump_tdep: SAVED_PC = %d\n", SAVED_PC); |
| 6197 | #endif |
| 6198 | fprintf_unfiltered (file, |
| 6199 | "mips_dump_tdep: SETUP_ARBITRARY_FRAME # %s\n", |
| 6200 | XSTRING (SETUP_ARBITRARY_FRAME (NUMARGS, ARGS))); |
| 6201 | fprintf_unfiltered (file, |
| 6202 | "mips_dump_tdep: SKIP_TRAMPOLINE_CODE # %s\n", |
| 6203 | XSTRING (SKIP_TRAMPOLINE_CODE (PC))); |
| 6204 | fprintf_unfiltered (file, |
| 6205 | "mips_dump_tdep: SOFTWARE_SINGLE_STEP # %s\n", |
| 6206 | XSTRING (SOFTWARE_SINGLE_STEP (SIG, BP_P))); |
| 6207 | fprintf_unfiltered (file, |
| 6208 | "mips_dump_tdep: SOFTWARE_SINGLE_STEP_P () = %d\n", |
| 6209 | SOFTWARE_SINGLE_STEP_P ()); |
| 6210 | fprintf_unfiltered (file, |
| 6211 | "mips_dump_tdep: STAB_REG_TO_REGNUM # %s\n", |
| 6212 | XSTRING (STAB_REG_TO_REGNUM (REGNUM))); |
| 6213 | #ifdef STACK_END_ADDR |
| 6214 | fprintf_unfiltered (file, |
| 6215 | "mips_dump_tdep: STACK_END_ADDR = %d\n", |
| 6216 | STACK_END_ADDR); |
| 6217 | #endif |
| 6218 | fprintf_unfiltered (file, |
| 6219 | "mips_dump_tdep: STEP_SKIPS_DELAY # %s\n", |
| 6220 | XSTRING (STEP_SKIPS_DELAY (PC))); |
| 6221 | fprintf_unfiltered (file, |
| 6222 | "mips_dump_tdep: STEP_SKIPS_DELAY_P = %d\n", |
| 6223 | STEP_SKIPS_DELAY_P); |
| 6224 | fprintf_unfiltered (file, |
| 6225 | "mips_dump_tdep: STOPPED_BY_WATCHPOINT # %s\n", |
| 6226 | XSTRING (STOPPED_BY_WATCHPOINT (WS))); |
| 6227 | fprintf_unfiltered (file, "mips_dump_tdep: T9_REGNUM = %d\n", T9_REGNUM); |
| 6228 | fprintf_unfiltered (file, |
| 6229 | "mips_dump_tdep: TABULAR_REGISTER_OUTPUT = used?\n"); |
| 6230 | fprintf_unfiltered (file, |
| 6231 | "mips_dump_tdep: TARGET_CAN_USE_HARDWARE_WATCHPOINT # %s\n", |
| 6232 | XSTRING (TARGET_CAN_USE_HARDWARE_WATCHPOINT |
| 6233 | (TYPE, CNT, OTHERTYPE))); |
| 6234 | #ifdef TRACE_CLEAR |
| 6235 | fprintf_unfiltered (file, |
| 6236 | "mips_dump_tdep: TRACE_CLEAR # %s\n", |
| 6237 | XSTRING (TRACE_CLEAR (THREAD, STATE))); |
| 6238 | #endif |
| 6239 | #ifdef TRACE_FLAVOR |
| 6240 | fprintf_unfiltered (file, |
| 6241 | "mips_dump_tdep: TRACE_FLAVOR = %d\n", TRACE_FLAVOR); |
| 6242 | #endif |
| 6243 | #ifdef TRACE_FLAVOR_SIZE |
| 6244 | fprintf_unfiltered (file, |
| 6245 | "mips_dump_tdep: TRACE_FLAVOR_SIZE = %d\n", |
| 6246 | TRACE_FLAVOR_SIZE); |
| 6247 | #endif |
| 6248 | #ifdef TRACE_SET |
| 6249 | fprintf_unfiltered (file, |
| 6250 | "mips_dump_tdep: TRACE_SET # %s\n", |
| 6251 | XSTRING (TRACE_SET (X, STATE))); |
| 6252 | #endif |
| 6253 | #ifdef UNUSED_REGNUM |
| 6254 | fprintf_unfiltered (file, |
| 6255 | "mips_dump_tdep: UNUSED_REGNUM = %d\n", UNUSED_REGNUM); |
| 6256 | #endif |
| 6257 | fprintf_unfiltered (file, "mips_dump_tdep: V0_REGNUM = %d\n", V0_REGNUM); |
| 6258 | fprintf_unfiltered (file, |
| 6259 | "mips_dump_tdep: VM_MIN_ADDRESS = %ld\n", |
| 6260 | (long) VM_MIN_ADDRESS); |
| 6261 | fprintf_unfiltered (file, |
| 6262 | "mips_dump_tdep: ZERO_REGNUM = %d\n", ZERO_REGNUM); |
| 6263 | } |
| 6264 | |
| 6265 | extern initialize_file_ftype _initialize_mips_tdep; /* -Wmissing-prototypes */ |
| 6266 | |
| 6267 | void |
| 6268 | _initialize_mips_tdep (void) |
| 6269 | { |
| 6270 | static struct cmd_list_element *mipsfpulist = NULL; |
| 6271 | struct cmd_list_element *c; |
| 6272 | |
| 6273 | mips_abi_string = mips_abi_strings[MIPS_ABI_UNKNOWN]; |
| 6274 | if (MIPS_ABI_LAST + 1 |
| 6275 | != sizeof (mips_abi_strings) / sizeof (mips_abi_strings[0])) |
| 6276 | internal_error (__FILE__, __LINE__, "mips_abi_strings out of sync"); |
| 6277 | |
| 6278 | gdbarch_register (bfd_arch_mips, mips_gdbarch_init, mips_dump_tdep); |
| 6279 | |
| 6280 | mips_pdr_data = register_objfile_data (); |
| 6281 | |
| 6282 | /* Add root prefix command for all "set mips"/"show mips" commands */ |
| 6283 | add_prefix_cmd ("mips", no_class, set_mips_command, |
| 6284 | "Various MIPS specific commands.", |
| 6285 | &setmipscmdlist, "set mips ", 0, &setlist); |
| 6286 | |
| 6287 | add_prefix_cmd ("mips", no_class, show_mips_command, |
| 6288 | "Various MIPS specific commands.", |
| 6289 | &showmipscmdlist, "show mips ", 0, &showlist); |
| 6290 | |
| 6291 | /* Allow the user to override the saved register size. */ |
| 6292 | deprecated_add_show_from_set (add_set_enum_cmd ("saved-gpreg-size", |
| 6293 | class_obscure, |
| 6294 | size_enums, |
| 6295 | &mips_abi_regsize_string, "\ |
| 6296 | Set size of general purpose registers saved on the stack.\n\ |
| 6297 | This option can be set to one of:\n\ |
| 6298 | 32 - Force GDB to treat saved GP registers as 32-bit\n\ |
| 6299 | 64 - Force GDB to treat saved GP registers as 64-bit\n\ |
| 6300 | auto - Allow GDB to use the target's default setting or autodetect the\n\ |
| 6301 | saved GP register size from information contained in the executable.\n\ |
| 6302 | (default: auto)", &setmipscmdlist), &showmipscmdlist); |
| 6303 | |
| 6304 | /* Allow the user to override the argument stack size. */ |
| 6305 | deprecated_add_show_from_set |
| 6306 | (add_set_enum_cmd ("stack-arg-size", |
| 6307 | class_obscure, |
| 6308 | size_enums, |
| 6309 | &mips_stack_argsize_string, "\ |
| 6310 | Set the amount of stack space reserved for each argument.\n\ |
| 6311 | This option can be set to one of:\n\ |
| 6312 | 32 - Force GDB to allocate 32-bit chunks per argument\n\ |
| 6313 | 64 - Force GDB to allocate 64-bit chunks per argument\n\ |
| 6314 | auto - Allow GDB to determine the correct setting from the current\n\ |
| 6315 | target and executable (default)", &setmipscmdlist), |
| 6316 | &showmipscmdlist); |
| 6317 | |
| 6318 | /* Allow the user to override the ABI. */ |
| 6319 | c = add_set_enum_cmd |
| 6320 | ("abi", class_obscure, mips_abi_strings, &mips_abi_string, |
| 6321 | "Set the ABI used by this program.\n" |
| 6322 | "This option can be set to one of:\n" |
| 6323 | " auto - the default ABI associated with the current binary\n" |
| 6324 | " o32\n" |
| 6325 | " o64\n" " n32\n" " n64\n" " eabi32\n" " eabi64", &setmipscmdlist); |
| 6326 | set_cmd_sfunc (c, mips_abi_update); |
| 6327 | add_cmd ("abi", class_obscure, show_mips_abi, |
| 6328 | "Show ABI in use by MIPS target", &showmipscmdlist); |
| 6329 | |
| 6330 | /* Let the user turn off floating point and set the fence post for |
| 6331 | heuristic_proc_start. */ |
| 6332 | |
| 6333 | add_prefix_cmd ("mipsfpu", class_support, set_mipsfpu_command, |
| 6334 | "Set use of MIPS floating-point coprocessor.", |
| 6335 | &mipsfpulist, "set mipsfpu ", 0, &setlist); |
| 6336 | add_cmd ("single", class_support, set_mipsfpu_single_command, |
| 6337 | "Select single-precision MIPS floating-point coprocessor.", |
| 6338 | &mipsfpulist); |
| 6339 | add_cmd ("double", class_support, set_mipsfpu_double_command, |
| 6340 | "Select double-precision MIPS floating-point coprocessor.", |
| 6341 | &mipsfpulist); |
| 6342 | add_alias_cmd ("on", "double", class_support, 1, &mipsfpulist); |
| 6343 | add_alias_cmd ("yes", "double", class_support, 1, &mipsfpulist); |
| 6344 | add_alias_cmd ("1", "double", class_support, 1, &mipsfpulist); |
| 6345 | add_cmd ("none", class_support, set_mipsfpu_none_command, |
| 6346 | "Select no MIPS floating-point coprocessor.", &mipsfpulist); |
| 6347 | add_alias_cmd ("off", "none", class_support, 1, &mipsfpulist); |
| 6348 | add_alias_cmd ("no", "none", class_support, 1, &mipsfpulist); |
| 6349 | add_alias_cmd ("0", "none", class_support, 1, &mipsfpulist); |
| 6350 | add_cmd ("auto", class_support, set_mipsfpu_auto_command, |
| 6351 | "Select MIPS floating-point coprocessor automatically.", |
| 6352 | &mipsfpulist); |
| 6353 | add_cmd ("mipsfpu", class_support, show_mipsfpu_command, |
| 6354 | "Show current use of MIPS floating-point coprocessor target.", |
| 6355 | &showlist); |
| 6356 | |
| 6357 | /* We really would like to have both "0" and "unlimited" work, but |
| 6358 | command.c doesn't deal with that. So make it a var_zinteger |
| 6359 | because the user can always use "999999" or some such for unlimited. */ |
| 6360 | c = add_set_cmd ("heuristic-fence-post", class_support, var_zinteger, |
| 6361 | (char *) &heuristic_fence_post, "\ |
| 6362 | Set the distance searched for the start of a function.\n\ |
| 6363 | If you are debugging a stripped executable, GDB needs to search through the\n\ |
| 6364 | program for the start of a function. This command sets the distance of the\n\ |
| 6365 | search. The only need to set it is when debugging a stripped executable.", &setlist); |
| 6366 | /* We need to throw away the frame cache when we set this, since it |
| 6367 | might change our ability to get backtraces. */ |
| 6368 | set_cmd_sfunc (c, reinit_frame_cache_sfunc); |
| 6369 | deprecated_add_show_from_set (c, &showlist); |
| 6370 | |
| 6371 | /* Allow the user to control whether the upper bits of 64-bit |
| 6372 | addresses should be zeroed. */ |
| 6373 | add_setshow_auto_boolean_cmd ("mask-address", no_class, &mask_address_var, "\ |
| 6374 | Set zeroing of upper 32 bits of 64-bit addresses.", "\ |
| 6375 | Show zeroing of upper 32 bits of 64-bit addresses.", "\ |
| 6376 | Use \"on\" to enable the masking, \"off\" to disable it and \"auto\" to \n\ |
| 6377 | allow GDB to determine the correct value.\n", "\ |
| 6378 | Zerroing of upper 32 bits of 64-bit address is %s.", |
| 6379 | NULL, show_mask_address, &setmipscmdlist, &showmipscmdlist); |
| 6380 | |
| 6381 | /* Allow the user to control the size of 32 bit registers within the |
| 6382 | raw remote packet. */ |
| 6383 | add_setshow_boolean_cmd ("remote-mips64-transfers-32bit-regs", class_obscure, |
| 6384 | &mips64_transfers_32bit_regs_p, "\ |
| 6385 | Set compatibility with 64-bit MIPS target that transfers 32-bit quantities.", "\ |
| 6386 | Show compatibility with 64-bit MIPS target that transfers 32-bit quantities.", "\ |
| 6387 | Use \"on\" to enable backward compatibility with older MIPS 64 GDB+target\n\ |
| 6388 | that would transfer 32 bits for some registers (e.g. SR, FSR) and\n\ |
| 6389 | 64 bits for others. Use \"off\" to disable compatibility mode", "\ |
| 6390 | Compatibility with 64-bit MIPS target that transfers 32-bit quantities is %s.", |
| 6391 | set_mips64_transfers_32bit_regs, NULL, &setlist, &showlist); |
| 6392 | |
| 6393 | /* Debug this files internals. */ |
| 6394 | deprecated_add_show_from_set |
| 6395 | (add_set_cmd ("mips", class_maintenance, var_zinteger, |
| 6396 | &mips_debug, "Set mips debugging.\n\ |
| 6397 | When non-zero, mips specific debugging is enabled.", &setdebuglist), |
| 6398 | &showdebuglist); |
| 6399 | } |