| 1 | /* Target-dependent code for the Tilera TILE-Gx processor. |
| 2 | |
| 3 | Copyright (C) 2012-2015 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "frame.h" |
| 22 | #include "frame-base.h" |
| 23 | #include "frame-unwind.h" |
| 24 | #include "dwarf2-frame.h" |
| 25 | #include "trad-frame.h" |
| 26 | #include "symtab.h" |
| 27 | #include "gdbtypes.h" |
| 28 | #include "gdbcmd.h" |
| 29 | #include "gdbcore.h" |
| 30 | #include "value.h" |
| 31 | #include "dis-asm.h" |
| 32 | #include "inferior.h" |
| 33 | #include "arch-utils.h" |
| 34 | #include "floatformat.h" |
| 35 | #include "regcache.h" |
| 36 | #include "regset.h" |
| 37 | #include "doublest.h" |
| 38 | #include "osabi.h" |
| 39 | #include "linux-tdep.h" |
| 40 | #include "objfiles.h" |
| 41 | #include "solib-svr4.h" |
| 42 | #include "tilegx-tdep.h" |
| 43 | #include "opcode/tilegx.h" |
| 44 | |
| 45 | struct tilegx_frame_cache |
| 46 | { |
| 47 | /* Base address. */ |
| 48 | CORE_ADDR base; |
| 49 | /* Function start. */ |
| 50 | CORE_ADDR start_pc; |
| 51 | |
| 52 | /* Table of saved registers. */ |
| 53 | struct trad_frame_saved_reg *saved_regs; |
| 54 | }; |
| 55 | |
| 56 | /* Register state values used by analyze_prologue. */ |
| 57 | enum reverse_state |
| 58 | { |
| 59 | REVERSE_STATE_REGISTER, |
| 60 | REVERSE_STATE_VALUE, |
| 61 | REVERSE_STATE_UNKNOWN |
| 62 | }; |
| 63 | |
| 64 | /* Register state used by analyze_prologue(). */ |
| 65 | struct tilegx_reverse_regs |
| 66 | { |
| 67 | LONGEST value; |
| 68 | enum reverse_state state; |
| 69 | }; |
| 70 | |
| 71 | static const struct tilegx_reverse_regs |
| 72 | template_reverse_regs[TILEGX_NUM_PHYS_REGS] = |
| 73 | { |
| 74 | { TILEGX_R0_REGNUM, REVERSE_STATE_REGISTER }, |
| 75 | { TILEGX_R1_REGNUM, REVERSE_STATE_REGISTER }, |
| 76 | { TILEGX_R2_REGNUM, REVERSE_STATE_REGISTER }, |
| 77 | { TILEGX_R3_REGNUM, REVERSE_STATE_REGISTER }, |
| 78 | { TILEGX_R4_REGNUM, REVERSE_STATE_REGISTER }, |
| 79 | { TILEGX_R5_REGNUM, REVERSE_STATE_REGISTER }, |
| 80 | { TILEGX_R6_REGNUM, REVERSE_STATE_REGISTER }, |
| 81 | { TILEGX_R7_REGNUM, REVERSE_STATE_REGISTER }, |
| 82 | { TILEGX_R8_REGNUM, REVERSE_STATE_REGISTER }, |
| 83 | { TILEGX_R9_REGNUM, REVERSE_STATE_REGISTER }, |
| 84 | { TILEGX_R10_REGNUM, REVERSE_STATE_REGISTER }, |
| 85 | { TILEGX_R11_REGNUM, REVERSE_STATE_REGISTER }, |
| 86 | { TILEGX_R12_REGNUM, REVERSE_STATE_REGISTER }, |
| 87 | { TILEGX_R13_REGNUM, REVERSE_STATE_REGISTER }, |
| 88 | { TILEGX_R14_REGNUM, REVERSE_STATE_REGISTER }, |
| 89 | { TILEGX_R15_REGNUM, REVERSE_STATE_REGISTER }, |
| 90 | { TILEGX_R16_REGNUM, REVERSE_STATE_REGISTER }, |
| 91 | { TILEGX_R17_REGNUM, REVERSE_STATE_REGISTER }, |
| 92 | { TILEGX_R18_REGNUM, REVERSE_STATE_REGISTER }, |
| 93 | { TILEGX_R19_REGNUM, REVERSE_STATE_REGISTER }, |
| 94 | { TILEGX_R20_REGNUM, REVERSE_STATE_REGISTER }, |
| 95 | { TILEGX_R21_REGNUM, REVERSE_STATE_REGISTER }, |
| 96 | { TILEGX_R22_REGNUM, REVERSE_STATE_REGISTER }, |
| 97 | { TILEGX_R23_REGNUM, REVERSE_STATE_REGISTER }, |
| 98 | { TILEGX_R24_REGNUM, REVERSE_STATE_REGISTER }, |
| 99 | { TILEGX_R25_REGNUM, REVERSE_STATE_REGISTER }, |
| 100 | { TILEGX_R26_REGNUM, REVERSE_STATE_REGISTER }, |
| 101 | { TILEGX_R27_REGNUM, REVERSE_STATE_REGISTER }, |
| 102 | { TILEGX_R28_REGNUM, REVERSE_STATE_REGISTER }, |
| 103 | { TILEGX_R29_REGNUM, REVERSE_STATE_REGISTER }, |
| 104 | { TILEGX_R30_REGNUM, REVERSE_STATE_REGISTER }, |
| 105 | { TILEGX_R31_REGNUM, REVERSE_STATE_REGISTER }, |
| 106 | { TILEGX_R32_REGNUM, REVERSE_STATE_REGISTER }, |
| 107 | { TILEGX_R33_REGNUM, REVERSE_STATE_REGISTER }, |
| 108 | { TILEGX_R34_REGNUM, REVERSE_STATE_REGISTER }, |
| 109 | { TILEGX_R35_REGNUM, REVERSE_STATE_REGISTER }, |
| 110 | { TILEGX_R36_REGNUM, REVERSE_STATE_REGISTER }, |
| 111 | { TILEGX_R37_REGNUM, REVERSE_STATE_REGISTER }, |
| 112 | { TILEGX_R38_REGNUM, REVERSE_STATE_REGISTER }, |
| 113 | { TILEGX_R39_REGNUM, REVERSE_STATE_REGISTER }, |
| 114 | { TILEGX_R40_REGNUM, REVERSE_STATE_REGISTER }, |
| 115 | { TILEGX_R41_REGNUM, REVERSE_STATE_REGISTER }, |
| 116 | { TILEGX_R42_REGNUM, REVERSE_STATE_REGISTER }, |
| 117 | { TILEGX_R43_REGNUM, REVERSE_STATE_REGISTER }, |
| 118 | { TILEGX_R44_REGNUM, REVERSE_STATE_REGISTER }, |
| 119 | { TILEGX_R45_REGNUM, REVERSE_STATE_REGISTER }, |
| 120 | { TILEGX_R46_REGNUM, REVERSE_STATE_REGISTER }, |
| 121 | { TILEGX_R47_REGNUM, REVERSE_STATE_REGISTER }, |
| 122 | { TILEGX_R48_REGNUM, REVERSE_STATE_REGISTER }, |
| 123 | { TILEGX_R49_REGNUM, REVERSE_STATE_REGISTER }, |
| 124 | { TILEGX_R50_REGNUM, REVERSE_STATE_REGISTER }, |
| 125 | { TILEGX_R51_REGNUM, REVERSE_STATE_REGISTER }, |
| 126 | { TILEGX_R52_REGNUM, REVERSE_STATE_REGISTER }, |
| 127 | { TILEGX_TP_REGNUM, REVERSE_STATE_REGISTER }, |
| 128 | { TILEGX_SP_REGNUM, REVERSE_STATE_REGISTER }, |
| 129 | { TILEGX_LR_REGNUM, REVERSE_STATE_REGISTER }, |
| 130 | { 0, REVERSE_STATE_UNKNOWN }, |
| 131 | { 0, REVERSE_STATE_UNKNOWN }, |
| 132 | { 0, REVERSE_STATE_UNKNOWN }, |
| 133 | { 0, REVERSE_STATE_UNKNOWN }, |
| 134 | { 0, REVERSE_STATE_UNKNOWN }, |
| 135 | { 0, REVERSE_STATE_UNKNOWN }, |
| 136 | { 0, REVERSE_STATE_UNKNOWN }, |
| 137 | { TILEGX_ZERO_REGNUM, REVERSE_STATE_VALUE } |
| 138 | }; |
| 139 | |
| 140 | /* Implement the "register_name" gdbarch method. */ |
| 141 | |
| 142 | static const char * |
| 143 | tilegx_register_name (struct gdbarch *gdbarch, int regnum) |
| 144 | { |
| 145 | static const char *const register_names[TILEGX_NUM_REGS] = |
| 146 | { |
| 147 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| 148 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", |
| 149 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", |
| 150 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", |
| 151 | "r32", "r33", "r34", "r35", "r36", "r37", "r38", "r39", |
| 152 | "r40", "r41", "r42", "r43", "r44", "r45", "r46", "r47", |
| 153 | "r48", "r49", "r50", "r51", "r52", "tp", "sp", "lr", |
| 154 | "sn", "idn0", "idn1", "udn0", "udn1", "udn2", "udn3", "zero", |
| 155 | "pc", "faultnum", |
| 156 | }; |
| 157 | |
| 158 | if (regnum < 0 || regnum >= TILEGX_NUM_REGS) |
| 159 | internal_error (__FILE__, __LINE__, |
| 160 | "tilegx_register_name: invalid register number %d", |
| 161 | regnum); |
| 162 | |
| 163 | return register_names[regnum]; |
| 164 | } |
| 165 | |
| 166 | /* This is the implementation of gdbarch method register_type. */ |
| 167 | |
| 168 | static struct type * |
| 169 | tilegx_register_type (struct gdbarch *gdbarch, int regnum) |
| 170 | { |
| 171 | if (regnum == TILEGX_PC_REGNUM) |
| 172 | return builtin_type (gdbarch)->builtin_func_ptr; |
| 173 | else |
| 174 | return builtin_type (gdbarch)->builtin_uint64; |
| 175 | } |
| 176 | |
| 177 | /* This is the implementation of gdbarch method dwarf2_reg_to_regnum. */ |
| 178 | |
| 179 | static int |
| 180 | tilegx_dwarf2_reg_to_regnum (struct gdbarch *gdbarch, int num) |
| 181 | { |
| 182 | return num; |
| 183 | } |
| 184 | |
| 185 | /* Makes the decision of whether a given type is a scalar type. |
| 186 | Scalar types are returned in the registers r2-r11 as they fit. */ |
| 187 | |
| 188 | static int |
| 189 | tilegx_type_is_scalar (struct type *t) |
| 190 | { |
| 191 | return (TYPE_CODE(t) != TYPE_CODE_STRUCT |
| 192 | && TYPE_CODE(t) != TYPE_CODE_UNION |
| 193 | && TYPE_CODE(t) != TYPE_CODE_ARRAY); |
| 194 | } |
| 195 | |
| 196 | /* Returns non-zero if the given struct type will be returned using |
| 197 | a special convention, rather than the normal function return method. |
| 198 | Used in the context of the "return" command, and target function |
| 199 | calls from the debugger. */ |
| 200 | |
| 201 | static int |
| 202 | tilegx_use_struct_convention (struct type *type) |
| 203 | { |
| 204 | /* Only scalars which fit in R0 - R9 can be returned in registers. |
| 205 | Otherwise, they are returned via a pointer passed in R0. */ |
| 206 | return (!tilegx_type_is_scalar (type) |
| 207 | && (TYPE_LENGTH (type) > (1 + TILEGX_R9_REGNUM - TILEGX_R0_REGNUM) |
| 208 | * tilegx_reg_size)); |
| 209 | } |
| 210 | |
| 211 | /* Find a function's return value in the appropriate registers (in |
| 212 | REGCACHE), and copy it into VALBUF. */ |
| 213 | |
| 214 | static void |
| 215 | tilegx_extract_return_value (struct type *type, struct regcache *regcache, |
| 216 | gdb_byte *valbuf) |
| 217 | { |
| 218 | int len = TYPE_LENGTH (type); |
| 219 | int i, regnum = TILEGX_R0_REGNUM; |
| 220 | |
| 221 | for (i = 0; i < len; i += tilegx_reg_size) |
| 222 | regcache_raw_read (regcache, regnum++, valbuf + i); |
| 223 | } |
| 224 | |
| 225 | /* Copy the function return value from VALBUF into the proper |
| 226 | location for a function return. |
| 227 | Called only in the context of the "return" command. */ |
| 228 | |
| 229 | static void |
| 230 | tilegx_store_return_value (struct type *type, struct regcache *regcache, |
| 231 | const void *valbuf) |
| 232 | { |
| 233 | if (TYPE_LENGTH (type) < tilegx_reg_size) |
| 234 | { |
| 235 | /* Add leading zeros to the (little-endian) value. */ |
| 236 | gdb_byte buf[tilegx_reg_size] = { 0 }; |
| 237 | |
| 238 | memcpy (buf, valbuf, TYPE_LENGTH (type)); |
| 239 | regcache_raw_write (regcache, TILEGX_R0_REGNUM, buf); |
| 240 | } |
| 241 | else |
| 242 | { |
| 243 | int len = TYPE_LENGTH (type); |
| 244 | int i, regnum = TILEGX_R0_REGNUM; |
| 245 | |
| 246 | for (i = 0; i < len; i += tilegx_reg_size) |
| 247 | regcache_raw_write (regcache, regnum++, (gdb_byte *) valbuf + i); |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | /* This is the implementation of gdbarch method return_value. */ |
| 252 | |
| 253 | static enum return_value_convention |
| 254 | tilegx_return_value (struct gdbarch *gdbarch, struct value *function, |
| 255 | struct type *type, struct regcache *regcache, |
| 256 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 257 | { |
| 258 | if (tilegx_use_struct_convention (type)) |
| 259 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 260 | if (writebuf) |
| 261 | tilegx_store_return_value (type, regcache, writebuf); |
| 262 | else if (readbuf) |
| 263 | tilegx_extract_return_value (type, regcache, readbuf); |
| 264 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 265 | } |
| 266 | |
| 267 | /* This is the implementation of gdbarch method frame_align. */ |
| 268 | |
| 269 | static CORE_ADDR |
| 270 | tilegx_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr) |
| 271 | { |
| 272 | return addr & -8; |
| 273 | } |
| 274 | |
| 275 | |
| 276 | /* Implement the "push_dummy_call" gdbarch method. */ |
| 277 | |
| 278 | static CORE_ADDR |
| 279 | tilegx_push_dummy_call (struct gdbarch *gdbarch, |
| 280 | struct value *function, |
| 281 | struct regcache *regcache, |
| 282 | CORE_ADDR bp_addr, int nargs, |
| 283 | struct value **args, |
| 284 | CORE_ADDR sp, int struct_return, |
| 285 | CORE_ADDR struct_addr) |
| 286 | { |
| 287 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 288 | CORE_ADDR stack_dest = sp; |
| 289 | int argreg = TILEGX_R0_REGNUM; |
| 290 | int i, j; |
| 291 | int typelen, slacklen, alignlen; |
| 292 | static const gdb_byte four_zero_words[16] = { 0 }; |
| 293 | |
| 294 | /* If struct_return is 1, then the struct return address will |
| 295 | consume one argument-passing register. */ |
| 296 | if (struct_return) |
| 297 | regcache_cooked_write_unsigned (regcache, argreg++, struct_addr); |
| 298 | |
| 299 | /* Arguments are passed in R0 - R9, and as soon as an argument |
| 300 | will not fit completely in the remaining registers, then it, |
| 301 | and all remaining arguments, are put on the stack. */ |
| 302 | for (i = 0; i < nargs && argreg <= TILEGX_R9_REGNUM; i++) |
| 303 | { |
| 304 | const gdb_byte *val; |
| 305 | typelen = TYPE_LENGTH (value_enclosing_type (args[i])); |
| 306 | |
| 307 | if (typelen > (TILEGX_R9_REGNUM - argreg + 1) * tilegx_reg_size) |
| 308 | break; |
| 309 | |
| 310 | /* Put argument into registers wordwise. */ |
| 311 | val = value_contents (args[i]); |
| 312 | for (j = 0; j < typelen; j += tilegx_reg_size) |
| 313 | { |
| 314 | /* ISSUE: Why special handling for "typelen = 4x + 1"? |
| 315 | I don't ever see "typelen" values except 4 and 8. */ |
| 316 | int n = (typelen - j == 1) ? 1 : tilegx_reg_size; |
| 317 | ULONGEST w = extract_unsigned_integer (val + j, n, byte_order); |
| 318 | |
| 319 | regcache_cooked_write_unsigned (regcache, argreg++, w); |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | /* Align SP. */ |
| 324 | stack_dest = tilegx_frame_align (gdbarch, stack_dest); |
| 325 | |
| 326 | /* Loop backwards through remaining arguments and push them on |
| 327 | the stack, word aligned. */ |
| 328 | for (j = nargs - 1; j >= i; j--) |
| 329 | { |
| 330 | gdb_byte *val; |
| 331 | struct cleanup *back_to; |
| 332 | const gdb_byte *contents = value_contents (args[j]); |
| 333 | |
| 334 | typelen = TYPE_LENGTH (value_enclosing_type (args[j])); |
| 335 | slacklen = align_up (typelen, 8) - typelen; |
| 336 | val = (gdb_byte *) xmalloc (typelen + slacklen); |
| 337 | back_to = make_cleanup (xfree, val); |
| 338 | memcpy (val, contents, typelen); |
| 339 | memset (val + typelen, 0, slacklen); |
| 340 | |
| 341 | /* Now write data to the stack. The stack grows downwards. */ |
| 342 | stack_dest -= typelen + slacklen; |
| 343 | write_memory (stack_dest, val, typelen + slacklen); |
| 344 | do_cleanups (back_to); |
| 345 | } |
| 346 | |
| 347 | /* Add 16 bytes for linkage space to the stack. */ |
| 348 | stack_dest = stack_dest - 16; |
| 349 | write_memory (stack_dest, four_zero_words, 16); |
| 350 | |
| 351 | /* Update stack pointer. */ |
| 352 | regcache_cooked_write_unsigned (regcache, TILEGX_SP_REGNUM, stack_dest); |
| 353 | |
| 354 | /* Set the return address register to point to the entry point of |
| 355 | the program, where a breakpoint lies in wait. */ |
| 356 | regcache_cooked_write_unsigned (regcache, TILEGX_LR_REGNUM, bp_addr); |
| 357 | |
| 358 | return stack_dest; |
| 359 | } |
| 360 | |
| 361 | |
| 362 | /* Decode the instructions within the given address range. |
| 363 | Decide when we must have reached the end of the function prologue. |
| 364 | If a frame_info pointer is provided, fill in its saved_regs etc. |
| 365 | Returns the address of the first instruction after the prologue. |
| 366 | NOTE: This is often called with start_addr being the start of some |
| 367 | function, and end_addr being the current PC. */ |
| 368 | |
| 369 | static CORE_ADDR |
| 370 | tilegx_analyze_prologue (struct gdbarch* gdbarch, |
| 371 | CORE_ADDR start_addr, CORE_ADDR end_addr, |
| 372 | struct tilegx_frame_cache *cache, |
| 373 | struct frame_info *next_frame) |
| 374 | { |
| 375 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 376 | CORE_ADDR next_addr; |
| 377 | CORE_ADDR prolog_end = end_addr; |
| 378 | ULONGEST inst, inst2; |
| 379 | LONGEST offset; |
| 380 | int regnum; |
| 381 | gdb_byte instbuf[32 * TILEGX_BUNDLE_SIZE_IN_BYTES]; |
| 382 | CORE_ADDR instbuf_start; |
| 383 | unsigned int instbuf_size; |
| 384 | int status; |
| 385 | bfd_uint64_t bundle; |
| 386 | struct tilegx_decoded_instruction |
| 387 | decoded[TILEGX_MAX_INSTRUCTIONS_PER_BUNDLE]; |
| 388 | int num_insns; |
| 389 | struct tilegx_reverse_regs reverse_frame[TILEGX_NUM_PHYS_REGS]; |
| 390 | struct tilegx_reverse_regs |
| 391 | new_reverse_frame[TILEGX_MAX_INSTRUCTIONS_PER_BUNDLE]; |
| 392 | int dest_regs[TILEGX_MAX_INSTRUCTIONS_PER_BUNDLE]; |
| 393 | int reverse_frame_valid, prolog_done, branch_seen, lr_saved_on_stack_p; |
| 394 | LONGEST prev_sp_value; |
| 395 | int i, j; |
| 396 | |
| 397 | if (start_addr >= end_addr |
| 398 | || (start_addr % TILEGX_BUNDLE_ALIGNMENT_IN_BYTES) != 0) |
| 399 | return end_addr; |
| 400 | |
| 401 | /* Initialize the reverse frame. This maps the CURRENT frame's |
| 402 | registers to the outer frame's registers (the frame on the |
| 403 | stack goes the other way). */ |
| 404 | memcpy (&reverse_frame, &template_reverse_regs, sizeof (reverse_frame)); |
| 405 | |
| 406 | prolog_done = 0; |
| 407 | branch_seen = 0; |
| 408 | prev_sp_value = 0; |
| 409 | lr_saved_on_stack_p = 0; |
| 410 | |
| 411 | /* To cut down on round-trip overhead, we fetch multiple bundles |
| 412 | at once. These variables describe the range of memory we have |
| 413 | prefetched. */ |
| 414 | instbuf_start = 0; |
| 415 | instbuf_size = 0; |
| 416 | |
| 417 | for (next_addr = start_addr; |
| 418 | next_addr < end_addr; |
| 419 | next_addr += TILEGX_BUNDLE_SIZE_IN_BYTES) |
| 420 | { |
| 421 | /* Retrieve the next instruction. */ |
| 422 | if (next_addr - instbuf_start >= instbuf_size) |
| 423 | { |
| 424 | /* Figure out how many bytes to fetch. Don't span a page |
| 425 | boundary since that might cause an unnecessary memory |
| 426 | error. */ |
| 427 | unsigned int size_on_same_page = 4096 - (next_addr & 4095); |
| 428 | |
| 429 | instbuf_size = sizeof instbuf; |
| 430 | |
| 431 | if (instbuf_size > size_on_same_page) |
| 432 | instbuf_size = size_on_same_page; |
| 433 | |
| 434 | instbuf_size = min (instbuf_size, (end_addr - next_addr)); |
| 435 | instbuf_start = next_addr; |
| 436 | |
| 437 | status = safe_frame_unwind_memory (next_frame, instbuf_start, |
| 438 | instbuf, instbuf_size); |
| 439 | if (status == 0) |
| 440 | memory_error (TARGET_XFER_E_IO, next_addr); |
| 441 | } |
| 442 | |
| 443 | reverse_frame_valid = 0; |
| 444 | |
| 445 | bundle = extract_unsigned_integer (&instbuf[next_addr - instbuf_start], |
| 446 | 8, byte_order); |
| 447 | |
| 448 | num_insns = parse_insn_tilegx (bundle, next_addr, decoded); |
| 449 | |
| 450 | for (i = 0; i < num_insns; i++) |
| 451 | { |
| 452 | struct tilegx_decoded_instruction *this_insn = &decoded[i]; |
| 453 | int64_t *operands = (int64_t *) this_insn->operand_values; |
| 454 | const struct tilegx_opcode *opcode = this_insn->opcode; |
| 455 | |
| 456 | switch (opcode->mnemonic) |
| 457 | { |
| 458 | case TILEGX_OPC_ST: |
| 459 | if (cache |
| 460 | && reverse_frame[operands[0]].state == REVERSE_STATE_VALUE |
| 461 | && reverse_frame[operands[1]].state |
| 462 | == REVERSE_STATE_REGISTER) |
| 463 | { |
| 464 | LONGEST saved_address = reverse_frame[operands[0]].value; |
| 465 | unsigned saved_register |
| 466 | = (unsigned) reverse_frame[operands[1]].value; |
| 467 | |
| 468 | /* realreg >= 0 and addr != -1 indicates that the |
| 469 | value of saved_register is in memory location |
| 470 | saved_address. The value of realreg is not |
| 471 | meaningful in this case but it must be >= 0. |
| 472 | See trad-frame.h. */ |
| 473 | cache->saved_regs[saved_register].realreg = saved_register; |
| 474 | cache->saved_regs[saved_register].addr = saved_address; |
| 475 | } |
| 476 | else if (cache |
| 477 | && (operands[0] == TILEGX_SP_REGNUM) |
| 478 | && (operands[1] == TILEGX_LR_REGNUM)) |
| 479 | lr_saved_on_stack_p = 1; |
| 480 | break; |
| 481 | case TILEGX_OPC_ADDI: |
| 482 | case TILEGX_OPC_ADDLI: |
| 483 | if (cache |
| 484 | && operands[0] == TILEGX_SP_REGNUM |
| 485 | && operands[1] == TILEGX_SP_REGNUM |
| 486 | && reverse_frame[operands[1]].state == REVERSE_STATE_REGISTER) |
| 487 | { |
| 488 | /* Special case. We're fixing up the stack frame. */ |
| 489 | uint64_t hopefully_sp |
| 490 | = (unsigned) reverse_frame[operands[1]].value; |
| 491 | short op2_as_short = (short) operands[2]; |
| 492 | signed char op2_as_char = (signed char) operands[2]; |
| 493 | |
| 494 | /* Fix up the sign-extension. */ |
| 495 | if (opcode->mnemonic == TILEGX_OPC_ADDI) |
| 496 | op2_as_short = op2_as_char; |
| 497 | prev_sp_value = (cache->saved_regs[hopefully_sp].addr |
| 498 | - op2_as_short); |
| 499 | |
| 500 | new_reverse_frame[i].state = REVERSE_STATE_VALUE; |
| 501 | new_reverse_frame[i].value |
| 502 | = cache->saved_regs[hopefully_sp].addr; |
| 503 | trad_frame_set_value (cache->saved_regs, |
| 504 | hopefully_sp, prev_sp_value); |
| 505 | } |
| 506 | else |
| 507 | { |
| 508 | short op2_as_short = (short) operands[2]; |
| 509 | signed char op2_as_char = (signed char) operands[2]; |
| 510 | |
| 511 | /* Fix up the sign-extension. */ |
| 512 | if (opcode->mnemonic == TILEGX_OPC_ADDI) |
| 513 | op2_as_short = op2_as_char; |
| 514 | |
| 515 | new_reverse_frame[i] = reverse_frame[operands[1]]; |
| 516 | if (new_reverse_frame[i].state == REVERSE_STATE_VALUE) |
| 517 | new_reverse_frame[i].value += op2_as_short; |
| 518 | else |
| 519 | new_reverse_frame[i].state = REVERSE_STATE_UNKNOWN; |
| 520 | } |
| 521 | reverse_frame_valid |= 1 << i; |
| 522 | dest_regs[i] = operands[0]; |
| 523 | break; |
| 524 | case TILEGX_OPC_ADD: |
| 525 | if (reverse_frame[operands[1]].state == REVERSE_STATE_VALUE |
| 526 | && reverse_frame[operands[2]].state == REVERSE_STATE_VALUE) |
| 527 | { |
| 528 | /* We have values -- we can do this. */ |
| 529 | new_reverse_frame[i] = reverse_frame[operands[2]]; |
| 530 | new_reverse_frame[i].value |
| 531 | += reverse_frame[operands[i]].value; |
| 532 | } |
| 533 | else |
| 534 | { |
| 535 | /* We don't know anything about the values. Punt. */ |
| 536 | new_reverse_frame[i].state = REVERSE_STATE_UNKNOWN; |
| 537 | } |
| 538 | reverse_frame_valid |= 1 << i; |
| 539 | dest_regs[i] = operands[0]; |
| 540 | break; |
| 541 | case TILEGX_OPC_MOVE: |
| 542 | new_reverse_frame[i] = reverse_frame[operands[1]]; |
| 543 | reverse_frame_valid |= 1 << i; |
| 544 | dest_regs[i] = operands[0]; |
| 545 | break; |
| 546 | case TILEGX_OPC_MOVEI: |
| 547 | case TILEGX_OPC_MOVELI: |
| 548 | new_reverse_frame[i].state = REVERSE_STATE_VALUE; |
| 549 | new_reverse_frame[i].value = operands[1]; |
| 550 | reverse_frame_valid |= 1 << i; |
| 551 | dest_regs[i] = operands[0]; |
| 552 | break; |
| 553 | case TILEGX_OPC_ORI: |
| 554 | if (reverse_frame[operands[1]].state == REVERSE_STATE_VALUE) |
| 555 | { |
| 556 | /* We have a value in A -- we can do this. */ |
| 557 | new_reverse_frame[i] = reverse_frame[operands[1]]; |
| 558 | new_reverse_frame[i].value |
| 559 | = reverse_frame[operands[1]].value | operands[2]; |
| 560 | } |
| 561 | else if (operands[2] == 0) |
| 562 | { |
| 563 | /* This is a move. */ |
| 564 | new_reverse_frame[i] = reverse_frame[operands[1]]; |
| 565 | } |
| 566 | else |
| 567 | { |
| 568 | /* We don't know anything about the values. Punt. */ |
| 569 | new_reverse_frame[i].state = REVERSE_STATE_UNKNOWN; |
| 570 | } |
| 571 | reverse_frame_valid |= 1 << i; |
| 572 | dest_regs[i] = operands[0]; |
| 573 | break; |
| 574 | case TILEGX_OPC_OR: |
| 575 | if (reverse_frame[operands[1]].state == REVERSE_STATE_VALUE |
| 576 | && reverse_frame[operands[1]].value == 0) |
| 577 | { |
| 578 | /* This is a move. */ |
| 579 | new_reverse_frame[i] = reverse_frame[operands[2]]; |
| 580 | } |
| 581 | else if (reverse_frame[operands[2]].state == REVERSE_STATE_VALUE |
| 582 | && reverse_frame[operands[2]].value == 0) |
| 583 | { |
| 584 | /* This is a move. */ |
| 585 | new_reverse_frame[i] = reverse_frame[operands[1]]; |
| 586 | } |
| 587 | else |
| 588 | { |
| 589 | /* We don't know anything about the values. Punt. */ |
| 590 | new_reverse_frame[i].state = REVERSE_STATE_UNKNOWN; |
| 591 | } |
| 592 | reverse_frame_valid |= 1 << i; |
| 593 | dest_regs[i] = operands[0]; |
| 594 | break; |
| 595 | case TILEGX_OPC_SUB: |
| 596 | if (reverse_frame[operands[1]].state == REVERSE_STATE_VALUE |
| 597 | && reverse_frame[operands[2]].state == REVERSE_STATE_VALUE) |
| 598 | { |
| 599 | /* We have values -- we can do this. */ |
| 600 | new_reverse_frame[i] = reverse_frame[operands[1]]; |
| 601 | new_reverse_frame[i].value |
| 602 | -= reverse_frame[operands[2]].value; |
| 603 | } |
| 604 | else |
| 605 | { |
| 606 | /* We don't know anything about the values. Punt. */ |
| 607 | new_reverse_frame[i].state = REVERSE_STATE_UNKNOWN; |
| 608 | } |
| 609 | reverse_frame_valid |= 1 << i; |
| 610 | dest_regs[i] = operands[0]; |
| 611 | break; |
| 612 | |
| 613 | case TILEGX_OPC_FNOP: |
| 614 | case TILEGX_OPC_INFO: |
| 615 | case TILEGX_OPC_INFOL: |
| 616 | /* Nothing to see here, move on. |
| 617 | Note that real NOP is treated as a 'real' instruction |
| 618 | because someone must have intended that it be there. |
| 619 | It therefore terminates the prolog. */ |
| 620 | break; |
| 621 | |
| 622 | case TILEGX_OPC_J: |
| 623 | case TILEGX_OPC_JAL: |
| 624 | |
| 625 | case TILEGX_OPC_BEQZ: |
| 626 | case TILEGX_OPC_BEQZT: |
| 627 | case TILEGX_OPC_BGEZ: |
| 628 | case TILEGX_OPC_BGEZT: |
| 629 | case TILEGX_OPC_BGTZ: |
| 630 | case TILEGX_OPC_BGTZT: |
| 631 | case TILEGX_OPC_BLBC: |
| 632 | case TILEGX_OPC_BLBCT: |
| 633 | case TILEGX_OPC_BLBS: |
| 634 | case TILEGX_OPC_BLBST: |
| 635 | case TILEGX_OPC_BLEZ: |
| 636 | case TILEGX_OPC_BLEZT: |
| 637 | case TILEGX_OPC_BLTZ: |
| 638 | case TILEGX_OPC_BLTZT: |
| 639 | case TILEGX_OPC_BNEZ: |
| 640 | case TILEGX_OPC_BNEZT: |
| 641 | |
| 642 | case TILEGX_OPC_IRET: |
| 643 | case TILEGX_OPC_JALR: |
| 644 | case TILEGX_OPC_JALRP: |
| 645 | case TILEGX_OPC_JR: |
| 646 | case TILEGX_OPC_JRP: |
| 647 | case TILEGX_OPC_SWINT0: |
| 648 | case TILEGX_OPC_SWINT1: |
| 649 | case TILEGX_OPC_SWINT2: |
| 650 | case TILEGX_OPC_SWINT3: |
| 651 | /* We're really done -- this is a branch. */ |
| 652 | branch_seen = 1; |
| 653 | prolog_done = 1; |
| 654 | break; |
| 655 | default: |
| 656 | /* We don't know or care what this instruction is. |
| 657 | All we know is that it isn't part of a prolog, and if |
| 658 | there's a destination register, we're trashing it. */ |
| 659 | prolog_done = 1; |
| 660 | for (j = 0; j < opcode->num_operands; j++) |
| 661 | { |
| 662 | if (this_insn->operands[j]->is_dest_reg) |
| 663 | { |
| 664 | dest_regs[i] = operands[j]; |
| 665 | new_reverse_frame[i].state = REVERSE_STATE_UNKNOWN; |
| 666 | reverse_frame_valid |= 1 << i; |
| 667 | break; |
| 668 | } |
| 669 | } |
| 670 | break; |
| 671 | } |
| 672 | } |
| 673 | |
| 674 | /* Now update the reverse frames. */ |
| 675 | for (i = 0; i < num_insns; i++) |
| 676 | { |
| 677 | /* ISSUE: Does this properly handle "network" registers? */ |
| 678 | if ((reverse_frame_valid & (1 << i)) |
| 679 | && dest_regs[i] != TILEGX_ZERO_REGNUM) |
| 680 | reverse_frame[dest_regs[i]] = new_reverse_frame[i]; |
| 681 | } |
| 682 | |
| 683 | if (prev_sp_value != 0) |
| 684 | { |
| 685 | /* GCC uses R52 as a frame pointer. Have we seen "move r52, sp"? */ |
| 686 | if (reverse_frame[TILEGX_R52_REGNUM].state == REVERSE_STATE_REGISTER |
| 687 | && reverse_frame[TILEGX_R52_REGNUM].value == TILEGX_SP_REGNUM) |
| 688 | { |
| 689 | reverse_frame[TILEGX_R52_REGNUM].state = REVERSE_STATE_VALUE; |
| 690 | reverse_frame[TILEGX_R52_REGNUM].value = prev_sp_value; |
| 691 | } |
| 692 | |
| 693 | prev_sp_value = 0; |
| 694 | } |
| 695 | |
| 696 | if (prolog_done && prolog_end == end_addr) |
| 697 | { |
| 698 | /* We found non-prolog code. As such, _this_ instruction |
| 699 | is the one after the prolog. We keep processing, because |
| 700 | there may be more prolog code in there, but this is what |
| 701 | we'll return. */ |
| 702 | /* ISSUE: There may not have actually been a prologue, and |
| 703 | we may have simply skipped some random instructions. */ |
| 704 | prolog_end = next_addr; |
| 705 | } |
| 706 | if (branch_seen) |
| 707 | { |
| 708 | /* We saw a branch. The prolog absolutely must be over. */ |
| 709 | break; |
| 710 | } |
| 711 | } |
| 712 | |
| 713 | if (prolog_end == end_addr && cache) |
| 714 | { |
| 715 | /* We may have terminated the prolog early, and we're certainly |
| 716 | at THIS point right now. It's possible that the values of |
| 717 | registers we need are currently actually in other registers |
| 718 | (and haven't been written to memory yet). Go find them. */ |
| 719 | for (i = 0; i < TILEGX_NUM_PHYS_REGS; i++) |
| 720 | { |
| 721 | if (reverse_frame[i].state == REVERSE_STATE_REGISTER |
| 722 | && reverse_frame[i].value != i) |
| 723 | { |
| 724 | unsigned saved_register = (unsigned) reverse_frame[i].value; |
| 725 | |
| 726 | cache->saved_regs[saved_register].realreg = i; |
| 727 | cache->saved_regs[saved_register].addr = (LONGEST) -1; |
| 728 | } |
| 729 | } |
| 730 | } |
| 731 | |
| 732 | if (lr_saved_on_stack_p) |
| 733 | { |
| 734 | cache->saved_regs[TILEGX_LR_REGNUM].realreg = TILEGX_LR_REGNUM; |
| 735 | cache->saved_regs[TILEGX_LR_REGNUM].addr = |
| 736 | cache->saved_regs[TILEGX_SP_REGNUM].addr; |
| 737 | } |
| 738 | |
| 739 | return prolog_end; |
| 740 | } |
| 741 | |
| 742 | /* This is the implementation of gdbarch method skip_prologue. */ |
| 743 | |
| 744 | static CORE_ADDR |
| 745 | tilegx_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc) |
| 746 | { |
| 747 | CORE_ADDR func_start, end_pc; |
| 748 | struct obj_section *s; |
| 749 | |
| 750 | /* This is the preferred method, find the end of the prologue by |
| 751 | using the debugging information. */ |
| 752 | if (find_pc_partial_function (start_pc, NULL, &func_start, NULL)) |
| 753 | { |
| 754 | CORE_ADDR post_prologue_pc |
| 755 | = skip_prologue_using_sal (gdbarch, func_start); |
| 756 | |
| 757 | if (post_prologue_pc != 0) |
| 758 | return max (start_pc, post_prologue_pc); |
| 759 | } |
| 760 | |
| 761 | /* Don't straddle a section boundary. */ |
| 762 | s = find_pc_section (start_pc); |
| 763 | end_pc = start_pc + 8 * TILEGX_BUNDLE_SIZE_IN_BYTES; |
| 764 | if (s != NULL) |
| 765 | end_pc = min (end_pc, obj_section_endaddr (s)); |
| 766 | |
| 767 | /* Otherwise, try to skip prologue the hard way. */ |
| 768 | return tilegx_analyze_prologue (gdbarch, |
| 769 | start_pc, |
| 770 | end_pc, |
| 771 | NULL, NULL); |
| 772 | } |
| 773 | |
| 774 | /* This is the implementation of gdbarch method stack_frame_destroyed_p. */ |
| 775 | |
| 776 | static int |
| 777 | tilegx_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 778 | { |
| 779 | CORE_ADDR func_addr = 0, func_end = 0; |
| 780 | |
| 781 | if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) |
| 782 | { |
| 783 | ULONGEST inst, inst2; |
| 784 | CORE_ADDR addr = func_end - TILEGX_BUNDLE_SIZE_IN_BYTES; |
| 785 | |
| 786 | /* FIXME: Find the actual epilogue. */ |
| 787 | /* HACK: Just assume the final bundle is the "ret" instruction". */ |
| 788 | if (pc > addr) |
| 789 | return 1; |
| 790 | } |
| 791 | return 0; |
| 792 | } |
| 793 | |
| 794 | /* This is the implementation of gdbarch method get_longjmp_target. */ |
| 795 | |
| 796 | static int |
| 797 | tilegx_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
| 798 | { |
| 799 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 800 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 801 | CORE_ADDR jb_addr; |
| 802 | gdb_byte buf[8]; |
| 803 | |
| 804 | jb_addr = get_frame_register_unsigned (frame, TILEGX_R0_REGNUM); |
| 805 | |
| 806 | /* TileGX jmp_buf contains 32 elements of type __uint_reg_t which |
| 807 | has a size of 8 bytes. The return address is stored in the 25th |
| 808 | slot. */ |
| 809 | if (target_read_memory (jb_addr + 25 * 8, buf, 8)) |
| 810 | return 0; |
| 811 | |
| 812 | *pc = extract_unsigned_integer (buf, 8, byte_order); |
| 813 | |
| 814 | return 1; |
| 815 | } |
| 816 | |
| 817 | /* by assigning the 'faultnum' reg in kernel pt_regs with this value, |
| 818 | kernel do_signal will not check r0. see tilegx kernel/signal.c |
| 819 | for details. */ |
| 820 | #define INT_SWINT_1_SIGRETURN (~0) |
| 821 | |
| 822 | /* Implement the "write_pc" gdbarch method. */ |
| 823 | |
| 824 | static void |
| 825 | tilegx_write_pc (struct regcache *regcache, CORE_ADDR pc) |
| 826 | { |
| 827 | regcache_cooked_write_unsigned (regcache, TILEGX_PC_REGNUM, pc); |
| 828 | |
| 829 | /* We must be careful with modifying the program counter. If we |
| 830 | just interrupted a system call, the kernel might try to restart |
| 831 | it when we resume the inferior. On restarting the system call, |
| 832 | the kernel will try backing up the program counter even though it |
| 833 | no longer points at the system call. This typically results in a |
| 834 | SIGSEGV or SIGILL. We can prevent this by writing INT_SWINT_1_SIGRETURN |
| 835 | in the "faultnum" pseudo-register. |
| 836 | |
| 837 | Note that "faultnum" is saved when setting up a dummy call frame. |
| 838 | This means that it is properly restored when that frame is |
| 839 | popped, and that the interrupted system call will be restarted |
| 840 | when we resume the inferior on return from a function call from |
| 841 | within GDB. In all other cases the system call will not be |
| 842 | restarted. */ |
| 843 | regcache_cooked_write_unsigned (regcache, TILEGX_FAULTNUM_REGNUM, |
| 844 | INT_SWINT_1_SIGRETURN); |
| 845 | } |
| 846 | |
| 847 | /* This is the implementation of gdbarch method breakpoint_from_pc. */ |
| 848 | |
| 849 | static const unsigned char * |
| 850 | tilegx_breakpoint_from_pc (struct gdbarch *gdbarch, |
| 851 | CORE_ADDR *pcptr, int *lenptr) |
| 852 | { |
| 853 | /* 64-bit pattern for a { bpt ; nop } bundle. */ |
| 854 | static const unsigned char breakpoint[] = |
| 855 | { 0x00, 0x50, 0x48, 0x51, 0xae, 0x44, 0x6a, 0x28 }; |
| 856 | |
| 857 | *lenptr = sizeof (breakpoint); |
| 858 | return breakpoint; |
| 859 | } |
| 860 | |
| 861 | /* Normal frames. */ |
| 862 | |
| 863 | static struct tilegx_frame_cache * |
| 864 | tilegx_frame_cache (struct frame_info *this_frame, void **this_cache) |
| 865 | { |
| 866 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 867 | struct tilegx_frame_cache *cache; |
| 868 | CORE_ADDR current_pc; |
| 869 | int i; |
| 870 | |
| 871 | if (*this_cache) |
| 872 | return (struct tilegx_frame_cache *) *this_cache; |
| 873 | |
| 874 | cache = FRAME_OBSTACK_ZALLOC (struct tilegx_frame_cache); |
| 875 | *this_cache = cache; |
| 876 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
| 877 | cache->base = 0; |
| 878 | cache->start_pc = get_frame_func (this_frame); |
| 879 | current_pc = get_frame_pc (this_frame); |
| 880 | |
| 881 | cache->base = get_frame_register_unsigned (this_frame, TILEGX_SP_REGNUM); |
| 882 | trad_frame_set_value (cache->saved_regs, TILEGX_SP_REGNUM, cache->base); |
| 883 | |
| 884 | if (cache->start_pc) |
| 885 | tilegx_analyze_prologue (gdbarch, cache->start_pc, current_pc, |
| 886 | cache, this_frame); |
| 887 | |
| 888 | cache->saved_regs[TILEGX_PC_REGNUM] = cache->saved_regs[TILEGX_LR_REGNUM]; |
| 889 | |
| 890 | return cache; |
| 891 | } |
| 892 | |
| 893 | /* Retrieve the value of REGNUM in FRAME. */ |
| 894 | |
| 895 | static struct value* |
| 896 | tilegx_frame_prev_register (struct frame_info *this_frame, |
| 897 | void **this_cache, |
| 898 | int regnum) |
| 899 | { |
| 900 | struct tilegx_frame_cache *info = |
| 901 | tilegx_frame_cache (this_frame, this_cache); |
| 902 | |
| 903 | return trad_frame_get_prev_register (this_frame, info->saved_regs, |
| 904 | regnum); |
| 905 | } |
| 906 | |
| 907 | /* Build frame id. */ |
| 908 | |
| 909 | static void |
| 910 | tilegx_frame_this_id (struct frame_info *this_frame, void **this_cache, |
| 911 | struct frame_id *this_id) |
| 912 | { |
| 913 | struct tilegx_frame_cache *info = |
| 914 | tilegx_frame_cache (this_frame, this_cache); |
| 915 | |
| 916 | /* This marks the outermost frame. */ |
| 917 | if (info->base == 0) |
| 918 | return; |
| 919 | |
| 920 | (*this_id) = frame_id_build (info->base, info->start_pc); |
| 921 | } |
| 922 | |
| 923 | static CORE_ADDR |
| 924 | tilegx_frame_base_address (struct frame_info *this_frame, void **this_cache) |
| 925 | { |
| 926 | struct tilegx_frame_cache *cache = |
| 927 | tilegx_frame_cache (this_frame, this_cache); |
| 928 | |
| 929 | return cache->base; |
| 930 | } |
| 931 | |
| 932 | static const struct frame_unwind tilegx_frame_unwind = { |
| 933 | NORMAL_FRAME, |
| 934 | default_frame_unwind_stop_reason, |
| 935 | tilegx_frame_this_id, |
| 936 | tilegx_frame_prev_register, |
| 937 | NULL, /* const struct frame_data *unwind_data */ |
| 938 | default_frame_sniffer, /* frame_sniffer_ftype *sniffer */ |
| 939 | NULL /* frame_prev_pc_ftype *prev_pc */ |
| 940 | }; |
| 941 | |
| 942 | static const struct frame_base tilegx_frame_base = { |
| 943 | &tilegx_frame_unwind, |
| 944 | tilegx_frame_base_address, |
| 945 | tilegx_frame_base_address, |
| 946 | tilegx_frame_base_address |
| 947 | }; |
| 948 | |
| 949 | static CORE_ADDR |
| 950 | tilegx_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 951 | { |
| 952 | return frame_unwind_register_unsigned (next_frame, TILEGX_SP_REGNUM); |
| 953 | } |
| 954 | |
| 955 | static CORE_ADDR |
| 956 | tilegx_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 957 | { |
| 958 | return frame_unwind_register_unsigned (next_frame, TILEGX_PC_REGNUM); |
| 959 | } |
| 960 | |
| 961 | static struct frame_id |
| 962 | tilegx_unwind_dummy_id (struct gdbarch *gdbarch, |
| 963 | struct frame_info *this_frame) |
| 964 | { |
| 965 | CORE_ADDR sp; |
| 966 | |
| 967 | sp = get_frame_register_unsigned (this_frame, TILEGX_SP_REGNUM); |
| 968 | return frame_id_build (sp, get_frame_pc (this_frame)); |
| 969 | } |
| 970 | |
| 971 | |
| 972 | /* We cannot read/write the "special" registers. */ |
| 973 | |
| 974 | static int |
| 975 | tilegx_cannot_reference_register (struct gdbarch *gdbarch, int regno) |
| 976 | { |
| 977 | if (regno >= 0 && regno < TILEGX_NUM_EASY_REGS) |
| 978 | return 0; |
| 979 | else if (regno == TILEGX_PC_REGNUM |
| 980 | || regno == TILEGX_FAULTNUM_REGNUM) |
| 981 | return 0; |
| 982 | else |
| 983 | return 1; |
| 984 | } |
| 985 | |
| 986 | static struct gdbarch * |
| 987 | tilegx_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 988 | { |
| 989 | struct gdbarch *gdbarch; |
| 990 | int arch_size = 64; |
| 991 | |
| 992 | /* Handle arch_size == 32 or 64. Default to 64. */ |
| 993 | if (info.abfd) |
| 994 | arch_size = bfd_get_arch_size (info.abfd); |
| 995 | |
| 996 | /* Try to find a pre-existing architecture. */ |
| 997 | for (arches = gdbarch_list_lookup_by_info (arches, &info); |
| 998 | arches != NULL; |
| 999 | arches = gdbarch_list_lookup_by_info (arches->next, &info)) |
| 1000 | { |
| 1001 | /* We only have two flavors -- just make sure arch_size matches. */ |
| 1002 | if (gdbarch_ptr_bit (arches->gdbarch) == arch_size) |
| 1003 | return (arches->gdbarch); |
| 1004 | } |
| 1005 | |
| 1006 | gdbarch = gdbarch_alloc (&info, NULL); |
| 1007 | |
| 1008 | /* Basic register fields and methods, datatype sizes and stuff. */ |
| 1009 | |
| 1010 | /* There are 64 physical registers which can be referenced by |
| 1011 | instructions (although only 56 of them can actually be |
| 1012 | debugged) and 1 magic register (the PC). The other three |
| 1013 | magic registers (ex1, syscall, orig_r0) which are known to |
| 1014 | "ptrace" are ignored by "gdb". Note that we simply pretend |
| 1015 | that there are 65 registers, and no "pseudo registers". */ |
| 1016 | set_gdbarch_num_regs (gdbarch, TILEGX_NUM_REGS); |
| 1017 | set_gdbarch_num_pseudo_regs (gdbarch, 0); |
| 1018 | |
| 1019 | set_gdbarch_sp_regnum (gdbarch, TILEGX_SP_REGNUM); |
| 1020 | set_gdbarch_pc_regnum (gdbarch, TILEGX_PC_REGNUM); |
| 1021 | |
| 1022 | set_gdbarch_register_name (gdbarch, tilegx_register_name); |
| 1023 | set_gdbarch_register_type (gdbarch, tilegx_register_type); |
| 1024 | |
| 1025 | set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| 1026 | set_gdbarch_int_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1027 | set_gdbarch_long_bit (gdbarch, arch_size); |
| 1028 | set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT); |
| 1029 | |
| 1030 | set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1031 | set_gdbarch_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); |
| 1032 | set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); |
| 1033 | |
| 1034 | set_gdbarch_ptr_bit (gdbarch, arch_size); |
| 1035 | set_gdbarch_addr_bit (gdbarch, arch_size); |
| 1036 | |
| 1037 | set_gdbarch_cannot_fetch_register (gdbarch, |
| 1038 | tilegx_cannot_reference_register); |
| 1039 | set_gdbarch_cannot_store_register (gdbarch, |
| 1040 | tilegx_cannot_reference_register); |
| 1041 | |
| 1042 | /* Stack grows down. */ |
| 1043 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 1044 | |
| 1045 | /* Frame Info. */ |
| 1046 | set_gdbarch_unwind_sp (gdbarch, tilegx_unwind_sp); |
| 1047 | set_gdbarch_unwind_pc (gdbarch, tilegx_unwind_pc); |
| 1048 | set_gdbarch_dummy_id (gdbarch, tilegx_unwind_dummy_id); |
| 1049 | set_gdbarch_frame_align (gdbarch, tilegx_frame_align); |
| 1050 | frame_base_set_default (gdbarch, &tilegx_frame_base); |
| 1051 | |
| 1052 | set_gdbarch_skip_prologue (gdbarch, tilegx_skip_prologue); |
| 1053 | |
| 1054 | set_gdbarch_stack_frame_destroyed_p (gdbarch, tilegx_stack_frame_destroyed_p); |
| 1055 | |
| 1056 | /* Map debug registers into internal register numbers. */ |
| 1057 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, tilegx_dwarf2_reg_to_regnum); |
| 1058 | |
| 1059 | /* These values and methods are used when gdb calls a target function. */ |
| 1060 | set_gdbarch_push_dummy_call (gdbarch, tilegx_push_dummy_call); |
| 1061 | set_gdbarch_get_longjmp_target (gdbarch, tilegx_get_longjmp_target); |
| 1062 | set_gdbarch_write_pc (gdbarch, tilegx_write_pc); |
| 1063 | set_gdbarch_breakpoint_from_pc (gdbarch, tilegx_breakpoint_from_pc); |
| 1064 | set_gdbarch_return_value (gdbarch, tilegx_return_value); |
| 1065 | |
| 1066 | set_gdbarch_print_insn (gdbarch, print_insn_tilegx); |
| 1067 | |
| 1068 | gdbarch_init_osabi (info, gdbarch); |
| 1069 | |
| 1070 | dwarf2_append_unwinders (gdbarch); |
| 1071 | frame_unwind_append_unwinder (gdbarch, &tilegx_frame_unwind); |
| 1072 | |
| 1073 | return gdbarch; |
| 1074 | } |
| 1075 | |
| 1076 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 1077 | extern initialize_file_ftype _initialize_tilegx_tdep; |
| 1078 | |
| 1079 | void |
| 1080 | _initialize_tilegx_tdep (void) |
| 1081 | { |
| 1082 | register_gdbarch_init (bfd_arch_tilegx, tilegx_gdbarch_init); |
| 1083 | } |