| 1 | /* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free |
| 4 | Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 21 | Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include "frame.h" |
| 25 | #include "inferior.h" |
| 26 | #include "target.h" |
| 27 | #include "value.h" |
| 28 | #include "bfd.h" |
| 29 | #include "gdb_string.h" |
| 30 | #include "gdbcore.h" |
| 31 | #include "objfiles.h" |
| 32 | #include "regcache.h" |
| 33 | #include "arch-utils.h" |
| 34 | #include "gdb_assert.h" |
| 35 | #include "dis-asm.h" |
| 36 | |
| 37 | #define D0_REGNUM 0 |
| 38 | #define D2_REGNUM 2 |
| 39 | #define D3_REGNUM 3 |
| 40 | #define A0_REGNUM 4 |
| 41 | #define A2_REGNUM 6 |
| 42 | #define A3_REGNUM 7 |
| 43 | #define MDR_REGNUM 10 |
| 44 | #define PSW_REGNUM 11 |
| 45 | #define LIR_REGNUM 12 |
| 46 | #define LAR_REGNUM 13 |
| 47 | #define MDRQ_REGNUM 14 |
| 48 | #define E0_REGNUM 15 |
| 49 | #define MCRH_REGNUM 26 |
| 50 | #define MCRL_REGNUM 27 |
| 51 | #define MCVF_REGNUM 28 |
| 52 | |
| 53 | enum movm_register_bits { |
| 54 | movm_exother_bit = 0x01, |
| 55 | movm_exreg1_bit = 0x02, |
| 56 | movm_exreg0_bit = 0x04, |
| 57 | movm_other_bit = 0x08, |
| 58 | movm_a3_bit = 0x10, |
| 59 | movm_a2_bit = 0x20, |
| 60 | movm_d3_bit = 0x40, |
| 61 | movm_d2_bit = 0x80 |
| 62 | }; |
| 63 | |
| 64 | extern void _initialize_mn10300_tdep (void); |
| 65 | static CORE_ADDR mn10300_analyze_prologue (struct frame_info *fi, |
| 66 | CORE_ADDR pc); |
| 67 | |
| 68 | /* mn10300 private data */ |
| 69 | struct gdbarch_tdep |
| 70 | { |
| 71 | int am33_mode; |
| 72 | #define AM33_MODE (gdbarch_tdep (current_gdbarch)->am33_mode) |
| 73 | }; |
| 74 | |
| 75 | /* Additional info used by the frame */ |
| 76 | |
| 77 | struct frame_extra_info |
| 78 | { |
| 79 | int status; |
| 80 | int stack_size; |
| 81 | }; |
| 82 | |
| 83 | |
| 84 | static char * |
| 85 | register_name (int reg, char **regs, long sizeof_regs) |
| 86 | { |
| 87 | if (reg < 0 || reg >= sizeof_regs / sizeof (regs[0])) |
| 88 | return NULL; |
| 89 | else |
| 90 | return regs[reg]; |
| 91 | } |
| 92 | |
| 93 | static const char * |
| 94 | mn10300_generic_register_name (int reg) |
| 95 | { |
| 96 | static char *regs[] = |
| 97 | { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", |
| 98 | "sp", "pc", "mdr", "psw", "lir", "lar", "", "", |
| 99 | "", "", "", "", "", "", "", "", |
| 100 | "", "", "", "", "", "", "", "fp" |
| 101 | }; |
| 102 | return register_name (reg, regs, sizeof regs); |
| 103 | } |
| 104 | |
| 105 | |
| 106 | static const char * |
| 107 | am33_register_name (int reg) |
| 108 | { |
| 109 | static char *regs[] = |
| 110 | { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", |
| 111 | "sp", "pc", "mdr", "psw", "lir", "lar", "", |
| 112 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| 113 | "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", "" |
| 114 | }; |
| 115 | return register_name (reg, regs, sizeof regs); |
| 116 | } |
| 117 | |
| 118 | static CORE_ADDR |
| 119 | mn10300_saved_pc_after_call (struct frame_info *fi) |
| 120 | { |
| 121 | return read_memory_integer (read_register (SP_REGNUM), 4); |
| 122 | } |
| 123 | |
| 124 | static void |
| 125 | mn10300_extract_return_value (struct gdbarch *gdbarch, struct type *type, |
| 126 | struct regcache *regcache, void *valbuf) |
| 127 | { |
| 128 | char buf[MAX_REGISTER_SIZE]; |
| 129 | int len = TYPE_LENGTH (type); |
| 130 | int reg, regsz; |
| 131 | |
| 132 | if (TYPE_CODE (type) == TYPE_CODE_PTR) |
| 133 | reg = 4; |
| 134 | else |
| 135 | reg = 0; |
| 136 | |
| 137 | regsz = register_size (gdbarch, reg); |
| 138 | if (len <= regsz) |
| 139 | { |
| 140 | regcache_raw_read (regcache, reg, buf); |
| 141 | memcpy (valbuf, buf, len); |
| 142 | } |
| 143 | else if (len <= 2 * regsz) |
| 144 | { |
| 145 | regcache_raw_read (regcache, reg, buf); |
| 146 | memcpy (valbuf, buf, regsz); |
| 147 | gdb_assert (regsz == register_size (gdbarch, reg + 1)); |
| 148 | regcache_raw_read (regcache, reg + 1, buf); |
| 149 | memcpy ((char *) valbuf + regsz, buf, len - regsz); |
| 150 | } |
| 151 | else |
| 152 | internal_error (__FILE__, __LINE__, |
| 153 | "Cannot extract return value %d bytes long.", len); |
| 154 | } |
| 155 | |
| 156 | static void |
| 157 | mn10300_store_return_value (struct gdbarch *gdbarch, struct type *type, |
| 158 | struct regcache *regcache, const void *valbuf) |
| 159 | { |
| 160 | int len = TYPE_LENGTH (type); |
| 161 | int reg, regsz; |
| 162 | |
| 163 | if (TYPE_CODE (type) == TYPE_CODE_PTR) |
| 164 | reg = 4; |
| 165 | else |
| 166 | reg = 0; |
| 167 | |
| 168 | regsz = register_size (gdbarch, reg); |
| 169 | |
| 170 | if (len <= regsz) |
| 171 | regcache_raw_write_part (regcache, reg, 0, len, valbuf); |
| 172 | else if (len <= 2 * regsz) |
| 173 | { |
| 174 | regcache_raw_write (regcache, reg, valbuf); |
| 175 | gdb_assert (regsz == register_size (gdbarch, reg + 1)); |
| 176 | regcache_raw_write_part (regcache, reg+1, 0, |
| 177 | len - regsz, (char *) valbuf + regsz); |
| 178 | } |
| 179 | else |
| 180 | internal_error (__FILE__, __LINE__, |
| 181 | "Cannot store return value %d bytes long.", len); |
| 182 | } |
| 183 | |
| 184 | static struct frame_info *analyze_dummy_frame (CORE_ADDR, CORE_ADDR); |
| 185 | static struct frame_info * |
| 186 | analyze_dummy_frame (CORE_ADDR pc, CORE_ADDR frame) |
| 187 | { |
| 188 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
| 189 | struct frame_info *dummy |
| 190 | = deprecated_frame_xmalloc_with_cleanup (SIZEOF_FRAME_SAVED_REGS, |
| 191 | sizeof (struct frame_extra_info)); |
| 192 | deprecated_update_frame_pc_hack (dummy, pc); |
| 193 | deprecated_update_frame_base_hack (dummy, frame); |
| 194 | get_frame_extra_info (dummy)->status = 0; |
| 195 | get_frame_extra_info (dummy)->stack_size = 0; |
| 196 | mn10300_analyze_prologue (dummy, pc); |
| 197 | do_cleanups (old_chain); |
| 198 | return dummy; |
| 199 | } |
| 200 | |
| 201 | /* Values for frame_info.status */ |
| 202 | |
| 203 | #define MY_FRAME_IN_SP 0x1 |
| 204 | #define MY_FRAME_IN_FP 0x2 |
| 205 | #define NO_MORE_FRAMES 0x4 |
| 206 | |
| 207 | /* Compute the alignment required by a type. */ |
| 208 | |
| 209 | static int |
| 210 | mn10300_type_align (struct type *type) |
| 211 | { |
| 212 | int i, align = 1; |
| 213 | |
| 214 | switch (TYPE_CODE (type)) |
| 215 | { |
| 216 | case TYPE_CODE_INT: |
| 217 | case TYPE_CODE_ENUM: |
| 218 | case TYPE_CODE_SET: |
| 219 | case TYPE_CODE_RANGE: |
| 220 | case TYPE_CODE_CHAR: |
| 221 | case TYPE_CODE_BOOL: |
| 222 | case TYPE_CODE_FLT: |
| 223 | case TYPE_CODE_PTR: |
| 224 | case TYPE_CODE_REF: |
| 225 | return TYPE_LENGTH (type); |
| 226 | |
| 227 | case TYPE_CODE_COMPLEX: |
| 228 | return TYPE_LENGTH (type) / 2; |
| 229 | |
| 230 | case TYPE_CODE_STRUCT: |
| 231 | case TYPE_CODE_UNION: |
| 232 | for (i = 0; i < TYPE_NFIELDS (type); i++) |
| 233 | { |
| 234 | int falign = mn10300_type_align (TYPE_FIELD_TYPE (type, i)); |
| 235 | while (align < falign) |
| 236 | align <<= 1; |
| 237 | } |
| 238 | return align; |
| 239 | |
| 240 | case TYPE_CODE_ARRAY: |
| 241 | /* HACK! Structures containing arrays, even small ones, are not |
| 242 | elligible for returning in registers. */ |
| 243 | return 256; |
| 244 | |
| 245 | case TYPE_CODE_TYPEDEF: |
| 246 | return mn10300_type_align (check_typedef (type)); |
| 247 | |
| 248 | default: |
| 249 | internal_error (__FILE__, __LINE__, "bad switch"); |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | /* Should call_function allocate stack space for a struct return? */ |
| 254 | static int |
| 255 | mn10300_use_struct_convention (struct type *type) |
| 256 | { |
| 257 | /* Structures bigger than a pair of words can't be returned in |
| 258 | registers. */ |
| 259 | if (TYPE_LENGTH (type) > 8) |
| 260 | return 1; |
| 261 | |
| 262 | switch (TYPE_CODE (type)) |
| 263 | { |
| 264 | case TYPE_CODE_STRUCT: |
| 265 | case TYPE_CODE_UNION: |
| 266 | /* Structures with a single field are handled as the field |
| 267 | itself. */ |
| 268 | if (TYPE_NFIELDS (type) == 1) |
| 269 | return mn10300_use_struct_convention (TYPE_FIELD_TYPE (type, 0)); |
| 270 | |
| 271 | /* Structures with word or double-word size are passed in memory, as |
| 272 | long as they require at least word alignment. */ |
| 273 | if (mn10300_type_align (type) >= 4) |
| 274 | return 0; |
| 275 | |
| 276 | return 1; |
| 277 | |
| 278 | /* Arrays are addressable, so they're never returned in |
| 279 | registers. This condition can only hold when the array is |
| 280 | the only field of a struct or union. */ |
| 281 | case TYPE_CODE_ARRAY: |
| 282 | return 1; |
| 283 | |
| 284 | case TYPE_CODE_TYPEDEF: |
| 285 | return mn10300_use_struct_convention (check_typedef (type)); |
| 286 | |
| 287 | default: |
| 288 | return 0; |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | /* Determine, for architecture GDBARCH, how a return value of TYPE |
| 293 | should be returned. If it is supposed to be returned in registers, |
| 294 | and READBUF is non-zero, read the appropriate value from REGCACHE, |
| 295 | and copy it into READBUF. If WRITEBUF is non-zero, write the value |
| 296 | from WRITEBUF into REGCACHE. */ |
| 297 | |
| 298 | static enum return_value_convention |
| 299 | mn10300_return_value (struct gdbarch *gdbarch, struct type *type, |
| 300 | struct regcache *regcache, void *readbuf, |
| 301 | const void *writebuf) |
| 302 | { |
| 303 | if (mn10300_use_struct_convention (type)) |
| 304 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 305 | |
| 306 | if (readbuf) |
| 307 | mn10300_extract_return_value (gdbarch, type, regcache, readbuf); |
| 308 | if (writebuf) |
| 309 | mn10300_store_return_value (gdbarch, type, regcache, writebuf); |
| 310 | |
| 311 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 312 | } |
| 313 | |
| 314 | /* The breakpoint instruction must be the same size as the smallest |
| 315 | instruction in the instruction set. |
| 316 | |
| 317 | The Matsushita mn10x00 processors have single byte instructions |
| 318 | so we need a single byte breakpoint. Matsushita hasn't defined |
| 319 | one, so we defined it ourselves. */ |
| 320 | |
| 321 | const static unsigned char * |
| 322 | mn10300_breakpoint_from_pc (CORE_ADDR *bp_addr, int *bp_size) |
| 323 | { |
| 324 | static char breakpoint[] = |
| 325 | {0xff}; |
| 326 | *bp_size = 1; |
| 327 | return breakpoint; |
| 328 | } |
| 329 | |
| 330 | |
| 331 | /* Fix fi->frame if it's bogus at this point. This is a helper |
| 332 | function for mn10300_analyze_prologue. */ |
| 333 | |
| 334 | static void |
| 335 | fix_frame_pointer (struct frame_info *fi, int stack_size) |
| 336 | { |
| 337 | if (fi && get_next_frame (fi) == NULL) |
| 338 | { |
| 339 | if (get_frame_extra_info (fi)->status & MY_FRAME_IN_SP) |
| 340 | deprecated_update_frame_base_hack (fi, read_sp () - stack_size); |
| 341 | else if (get_frame_extra_info (fi)->status & MY_FRAME_IN_FP) |
| 342 | deprecated_update_frame_base_hack (fi, read_register (A3_REGNUM)); |
| 343 | } |
| 344 | } |
| 345 | |
| 346 | |
| 347 | /* Set offsets of registers saved by movm instruction. |
| 348 | This is a helper function for mn10300_analyze_prologue. */ |
| 349 | |
| 350 | static void |
| 351 | set_movm_offsets (struct frame_info *fi, int movm_args) |
| 352 | { |
| 353 | int offset = 0; |
| 354 | |
| 355 | if (fi == NULL || movm_args == 0) |
| 356 | return; |
| 357 | |
| 358 | if (movm_args & movm_other_bit) |
| 359 | { |
| 360 | /* The `other' bit leaves a blank area of four bytes at the |
| 361 | beginning of its block of saved registers, making it 32 bytes |
| 362 | long in total. */ |
| 363 | deprecated_get_frame_saved_regs (fi)[LAR_REGNUM] = get_frame_base (fi) + offset + 4; |
| 364 | deprecated_get_frame_saved_regs (fi)[LIR_REGNUM] = get_frame_base (fi) + offset + 8; |
| 365 | deprecated_get_frame_saved_regs (fi)[MDR_REGNUM] = get_frame_base (fi) + offset + 12; |
| 366 | deprecated_get_frame_saved_regs (fi)[A0_REGNUM + 1] = get_frame_base (fi) + offset + 16; |
| 367 | deprecated_get_frame_saved_regs (fi)[A0_REGNUM] = get_frame_base (fi) + offset + 20; |
| 368 | deprecated_get_frame_saved_regs (fi)[D0_REGNUM + 1] = get_frame_base (fi) + offset + 24; |
| 369 | deprecated_get_frame_saved_regs (fi)[D0_REGNUM] = get_frame_base (fi) + offset + 28; |
| 370 | offset += 32; |
| 371 | } |
| 372 | if (movm_args & movm_a3_bit) |
| 373 | { |
| 374 | deprecated_get_frame_saved_regs (fi)[A3_REGNUM] = get_frame_base (fi) + offset; |
| 375 | offset += 4; |
| 376 | } |
| 377 | if (movm_args & movm_a2_bit) |
| 378 | { |
| 379 | deprecated_get_frame_saved_regs (fi)[A2_REGNUM] = get_frame_base (fi) + offset; |
| 380 | offset += 4; |
| 381 | } |
| 382 | if (movm_args & movm_d3_bit) |
| 383 | { |
| 384 | deprecated_get_frame_saved_regs (fi)[D3_REGNUM] = get_frame_base (fi) + offset; |
| 385 | offset += 4; |
| 386 | } |
| 387 | if (movm_args & movm_d2_bit) |
| 388 | { |
| 389 | deprecated_get_frame_saved_regs (fi)[D2_REGNUM] = get_frame_base (fi) + offset; |
| 390 | offset += 4; |
| 391 | } |
| 392 | if (AM33_MODE) |
| 393 | { |
| 394 | if (movm_args & movm_exother_bit) |
| 395 | { |
| 396 | deprecated_get_frame_saved_regs (fi)[MCVF_REGNUM] = get_frame_base (fi) + offset; |
| 397 | deprecated_get_frame_saved_regs (fi)[MCRL_REGNUM] = get_frame_base (fi) + offset + 4; |
| 398 | deprecated_get_frame_saved_regs (fi)[MCRH_REGNUM] = get_frame_base (fi) + offset + 8; |
| 399 | deprecated_get_frame_saved_regs (fi)[MDRQ_REGNUM] = get_frame_base (fi) + offset + 12; |
| 400 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 1] = get_frame_base (fi) + offset + 16; |
| 401 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 0] = get_frame_base (fi) + offset + 20; |
| 402 | offset += 24; |
| 403 | } |
| 404 | if (movm_args & movm_exreg1_bit) |
| 405 | { |
| 406 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 7] = get_frame_base (fi) + offset; |
| 407 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 6] = get_frame_base (fi) + offset + 4; |
| 408 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 5] = get_frame_base (fi) + offset + 8; |
| 409 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 4] = get_frame_base (fi) + offset + 12; |
| 410 | offset += 16; |
| 411 | } |
| 412 | if (movm_args & movm_exreg0_bit) |
| 413 | { |
| 414 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 3] = get_frame_base (fi) + offset; |
| 415 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 2] = get_frame_base (fi) + offset + 4; |
| 416 | offset += 8; |
| 417 | } |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | |
| 422 | /* The main purpose of this file is dealing with prologues to extract |
| 423 | information about stack frames and saved registers. |
| 424 | |
| 425 | In gcc/config/mn13000/mn10300.c, the expand_prologue prologue |
| 426 | function is pretty readable, and has a nice explanation of how the |
| 427 | prologue is generated. The prologues generated by that code will |
| 428 | have the following form (NOTE: the current code doesn't handle all |
| 429 | this!): |
| 430 | |
| 431 | + If this is an old-style varargs function, then its arguments |
| 432 | need to be flushed back to the stack: |
| 433 | |
| 434 | mov d0,(4,sp) |
| 435 | mov d1,(4,sp) |
| 436 | |
| 437 | + If we use any of the callee-saved registers, save them now. |
| 438 | |
| 439 | movm [some callee-saved registers],(sp) |
| 440 | |
| 441 | + If we have any floating-point registers to save: |
| 442 | |
| 443 | - Decrement the stack pointer to reserve space for the registers. |
| 444 | If the function doesn't need a frame pointer, we may combine |
| 445 | this with the adjustment that reserves space for the frame. |
| 446 | |
| 447 | add -SIZE, sp |
| 448 | |
| 449 | - Save the floating-point registers. We have two possible |
| 450 | strategies: |
| 451 | |
| 452 | . Save them at fixed offset from the SP: |
| 453 | |
| 454 | fmov fsN,(OFFSETN,sp) |
| 455 | fmov fsM,(OFFSETM,sp) |
| 456 | ... |
| 457 | |
| 458 | Note that, if OFFSETN happens to be zero, you'll get the |
| 459 | different opcode: fmov fsN,(sp) |
| 460 | |
| 461 | . Or, set a0 to the start of the save area, and then use |
| 462 | post-increment addressing to save the FP registers. |
| 463 | |
| 464 | mov sp, a0 |
| 465 | add SIZE, a0 |
| 466 | fmov fsN,(a0+) |
| 467 | fmov fsM,(a0+) |
| 468 | ... |
| 469 | |
| 470 | + If the function needs a frame pointer, we set it here. |
| 471 | |
| 472 | mov sp, a3 |
| 473 | |
| 474 | + Now we reserve space for the stack frame proper. This could be |
| 475 | merged into the `add -SIZE, sp' instruction for FP saves up |
| 476 | above, unless we needed to set the frame pointer in the previous |
| 477 | step, or the frame is so large that allocating the whole thing at |
| 478 | once would put the FP register save slots out of reach of the |
| 479 | addressing mode (128 bytes). |
| 480 | |
| 481 | add -SIZE, sp |
| 482 | |
| 483 | One day we might keep the stack pointer constant, that won't |
| 484 | change the code for prologues, but it will make the frame |
| 485 | pointerless case much more common. */ |
| 486 | |
| 487 | /* Analyze the prologue to determine where registers are saved, |
| 488 | the end of the prologue, etc etc. Return the end of the prologue |
| 489 | scanned. |
| 490 | |
| 491 | We store into FI (if non-null) several tidbits of information: |
| 492 | |
| 493 | * stack_size -- size of this stack frame. Note that if we stop in |
| 494 | certain parts of the prologue/epilogue we may claim the size of the |
| 495 | current frame is zero. This happens when the current frame has |
| 496 | not been allocated yet or has already been deallocated. |
| 497 | |
| 498 | * fsr -- Addresses of registers saved in the stack by this frame. |
| 499 | |
| 500 | * status -- A (relatively) generic status indicator. It's a bitmask |
| 501 | with the following bits: |
| 502 | |
| 503 | MY_FRAME_IN_SP: The base of the current frame is actually in |
| 504 | the stack pointer. This can happen for frame pointerless |
| 505 | functions, or cases where we're stopped in the prologue/epilogue |
| 506 | itself. For these cases mn10300_analyze_prologue will need up |
| 507 | update fi->frame before returning or analyzing the register |
| 508 | save instructions. |
| 509 | |
| 510 | MY_FRAME_IN_FP: The base of the current frame is in the |
| 511 | frame pointer register ($a3). |
| 512 | |
| 513 | NO_MORE_FRAMES: Set this if the current frame is "start" or |
| 514 | if the first instruction looks like mov <imm>,sp. This tells |
| 515 | frame chain to not bother trying to unwind past this frame. */ |
| 516 | |
| 517 | static CORE_ADDR |
| 518 | mn10300_analyze_prologue (struct frame_info *fi, CORE_ADDR pc) |
| 519 | { |
| 520 | CORE_ADDR func_addr, func_end, addr, stop; |
| 521 | CORE_ADDR stack_size; |
| 522 | int imm_size; |
| 523 | unsigned char buf[4]; |
| 524 | int status, movm_args = 0; |
| 525 | char *name; |
| 526 | |
| 527 | /* Use the PC in the frame if it's provided to look up the |
| 528 | start of this function. |
| 529 | |
| 530 | Note: kevinb/2003-07-16: We used to do the following here: |
| 531 | pc = (fi ? get_frame_pc (fi) : pc); |
| 532 | But this is (now) badly broken when called from analyze_dummy_frame(). |
| 533 | */ |
| 534 | pc = (pc ? pc : get_frame_pc (fi)); |
| 535 | |
| 536 | /* Find the start of this function. */ |
| 537 | status = find_pc_partial_function (pc, &name, &func_addr, &func_end); |
| 538 | |
| 539 | /* Do nothing if we couldn't find the start of this function or if we're |
| 540 | stopped at the first instruction in the prologue. */ |
| 541 | if (status == 0) |
| 542 | { |
| 543 | return pc; |
| 544 | } |
| 545 | |
| 546 | /* If we're in start, then give up. */ |
| 547 | if (strcmp (name, "start") == 0) |
| 548 | { |
| 549 | if (fi != NULL) |
| 550 | get_frame_extra_info (fi)->status = NO_MORE_FRAMES; |
| 551 | return pc; |
| 552 | } |
| 553 | |
| 554 | /* At the start of a function our frame is in the stack pointer. */ |
| 555 | if (fi) |
| 556 | get_frame_extra_info (fi)->status = MY_FRAME_IN_SP; |
| 557 | |
| 558 | /* Get the next two bytes into buf, we need two because rets is a two |
| 559 | byte insn and the first isn't enough to uniquely identify it. */ |
| 560 | status = deprecated_read_memory_nobpt (pc, buf, 2); |
| 561 | if (status != 0) |
| 562 | return pc; |
| 563 | |
| 564 | #if 0 |
| 565 | /* Note: kevinb/2003-07-16: We shouldn't be making these sorts of |
| 566 | changes to the frame in prologue examination code. */ |
| 567 | /* If we're physically on an "rets" instruction, then our frame has |
| 568 | already been deallocated. Note this can also be true for retf |
| 569 | and ret if they specify a size of zero. |
| 570 | |
| 571 | In this case fi->frame is bogus, we need to fix it. */ |
| 572 | if (fi && buf[0] == 0xf0 && buf[1] == 0xfc) |
| 573 | { |
| 574 | if (get_next_frame (fi) == NULL) |
| 575 | deprecated_update_frame_base_hack (fi, read_sp ()); |
| 576 | return get_frame_pc (fi); |
| 577 | } |
| 578 | |
| 579 | /* Similarly if we're stopped on the first insn of a prologue as our |
| 580 | frame hasn't been allocated yet. */ |
| 581 | if (fi && get_frame_pc (fi) == func_addr) |
| 582 | { |
| 583 | if (get_next_frame (fi) == NULL) |
| 584 | deprecated_update_frame_base_hack (fi, read_sp ()); |
| 585 | return get_frame_pc (fi); |
| 586 | } |
| 587 | #endif |
| 588 | |
| 589 | /* Figure out where to stop scanning. */ |
| 590 | stop = fi ? pc : func_end; |
| 591 | |
| 592 | /* Don't walk off the end of the function. */ |
| 593 | stop = stop > func_end ? func_end : stop; |
| 594 | |
| 595 | /* Start scanning on the first instruction of this function. */ |
| 596 | addr = func_addr; |
| 597 | |
| 598 | /* Suck in two bytes. */ |
| 599 | if (addr + 2 >= stop |
| 600 | || (status = deprecated_read_memory_nobpt (addr, buf, 2)) != 0) |
| 601 | { |
| 602 | fix_frame_pointer (fi, 0); |
| 603 | return addr; |
| 604 | } |
| 605 | |
| 606 | /* First see if this insn sets the stack pointer from a register; if |
| 607 | so, it's probably the initialization of the stack pointer in _start, |
| 608 | so mark this as the bottom-most frame. */ |
| 609 | if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0) |
| 610 | { |
| 611 | if (fi) |
| 612 | get_frame_extra_info (fi)->status = NO_MORE_FRAMES; |
| 613 | return addr; |
| 614 | } |
| 615 | |
| 616 | /* Now look for movm [regs],sp, which saves the callee saved registers. |
| 617 | |
| 618 | At this time we don't know if fi->frame is valid, so we only note |
| 619 | that we encountered a movm instruction. Later, we'll set the entries |
| 620 | in fsr.regs as needed. */ |
| 621 | if (buf[0] == 0xcf) |
| 622 | { |
| 623 | /* Extract the register list for the movm instruction. */ |
| 624 | status = deprecated_read_memory_nobpt (addr + 1, buf, 1); |
| 625 | movm_args = *buf; |
| 626 | |
| 627 | addr += 2; |
| 628 | |
| 629 | /* Quit now if we're beyond the stop point. */ |
| 630 | if (addr >= stop) |
| 631 | { |
| 632 | /* Fix fi->frame since it's bogus at this point. */ |
| 633 | if (fi && get_next_frame (fi) == NULL) |
| 634 | deprecated_update_frame_base_hack (fi, read_sp ()); |
| 635 | |
| 636 | /* Note if/where callee saved registers were saved. */ |
| 637 | set_movm_offsets (fi, movm_args); |
| 638 | return addr; |
| 639 | } |
| 640 | |
| 641 | /* Get the next two bytes so the prologue scan can continue. */ |
| 642 | status = deprecated_read_memory_nobpt (addr, buf, 2); |
| 643 | if (status != 0) |
| 644 | { |
| 645 | /* Fix fi->frame since it's bogus at this point. */ |
| 646 | if (fi && get_next_frame (fi) == NULL) |
| 647 | deprecated_update_frame_base_hack (fi, read_sp ()); |
| 648 | |
| 649 | /* Note if/where callee saved registers were saved. */ |
| 650 | set_movm_offsets (fi, movm_args); |
| 651 | return addr; |
| 652 | } |
| 653 | } |
| 654 | |
| 655 | /* Now see if we set up a frame pointer via "mov sp,a3" */ |
| 656 | if (buf[0] == 0x3f) |
| 657 | { |
| 658 | addr += 1; |
| 659 | |
| 660 | /* The frame pointer is now valid. */ |
| 661 | if (fi) |
| 662 | { |
| 663 | get_frame_extra_info (fi)->status |= MY_FRAME_IN_FP; |
| 664 | get_frame_extra_info (fi)->status &= ~MY_FRAME_IN_SP; |
| 665 | } |
| 666 | |
| 667 | /* Quit now if we're beyond the stop point. */ |
| 668 | if (addr >= stop) |
| 669 | { |
| 670 | /* Fix fi->frame if it's bogus at this point. */ |
| 671 | fix_frame_pointer (fi, 0); |
| 672 | |
| 673 | /* Note if/where callee saved registers were saved. */ |
| 674 | set_movm_offsets (fi, movm_args); |
| 675 | return addr; |
| 676 | } |
| 677 | |
| 678 | /* Get two more bytes so scanning can continue. */ |
| 679 | status = deprecated_read_memory_nobpt (addr, buf, 2); |
| 680 | if (status != 0) |
| 681 | { |
| 682 | /* Fix fi->frame if it's bogus at this point. */ |
| 683 | fix_frame_pointer (fi, 0); |
| 684 | |
| 685 | /* Note if/where callee saved registers were saved. */ |
| 686 | set_movm_offsets (fi, movm_args); |
| 687 | return addr; |
| 688 | } |
| 689 | } |
| 690 | |
| 691 | /* Next we should allocate the local frame. No more prologue insns |
| 692 | are found after allocating the local frame. |
| 693 | |
| 694 | Search for add imm8,sp (0xf8feXX) |
| 695 | or add imm16,sp (0xfafeXXXX) |
| 696 | or add imm32,sp (0xfcfeXXXXXXXX). |
| 697 | |
| 698 | If none of the above was found, then this prologue has no |
| 699 | additional stack. */ |
| 700 | |
| 701 | status = deprecated_read_memory_nobpt (addr, buf, 2); |
| 702 | if (status != 0) |
| 703 | { |
| 704 | /* Fix fi->frame if it's bogus at this point. */ |
| 705 | fix_frame_pointer (fi, 0); |
| 706 | |
| 707 | /* Note if/where callee saved registers were saved. */ |
| 708 | set_movm_offsets (fi, movm_args); |
| 709 | return addr; |
| 710 | } |
| 711 | |
| 712 | imm_size = 0; |
| 713 | if (buf[0] == 0xf8 && buf[1] == 0xfe) |
| 714 | imm_size = 1; |
| 715 | else if (buf[0] == 0xfa && buf[1] == 0xfe) |
| 716 | imm_size = 2; |
| 717 | else if (buf[0] == 0xfc && buf[1] == 0xfe) |
| 718 | imm_size = 4; |
| 719 | |
| 720 | if (imm_size != 0) |
| 721 | { |
| 722 | /* Suck in imm_size more bytes, they'll hold the size of the |
| 723 | current frame. */ |
| 724 | status = deprecated_read_memory_nobpt (addr + 2, buf, imm_size); |
| 725 | if (status != 0) |
| 726 | { |
| 727 | /* Fix fi->frame if it's bogus at this point. */ |
| 728 | fix_frame_pointer (fi, 0); |
| 729 | |
| 730 | /* Note if/where callee saved registers were saved. */ |
| 731 | set_movm_offsets (fi, movm_args); |
| 732 | return addr; |
| 733 | } |
| 734 | |
| 735 | /* Note the size of the stack in the frame info structure. */ |
| 736 | stack_size = extract_signed_integer (buf, imm_size); |
| 737 | if (fi) |
| 738 | get_frame_extra_info (fi)->stack_size = stack_size; |
| 739 | |
| 740 | /* We just consumed 2 + imm_size bytes. */ |
| 741 | addr += 2 + imm_size; |
| 742 | |
| 743 | /* No more prologue insns follow, so begin preparation to return. */ |
| 744 | /* Fix fi->frame if it's bogus at this point. */ |
| 745 | fix_frame_pointer (fi, stack_size); |
| 746 | |
| 747 | /* Note if/where callee saved registers were saved. */ |
| 748 | set_movm_offsets (fi, movm_args); |
| 749 | return addr; |
| 750 | } |
| 751 | |
| 752 | /* We never found an insn which allocates local stack space, regardless |
| 753 | this is the end of the prologue. */ |
| 754 | /* Fix fi->frame if it's bogus at this point. */ |
| 755 | fix_frame_pointer (fi, 0); |
| 756 | |
| 757 | /* Note if/where callee saved registers were saved. */ |
| 758 | set_movm_offsets (fi, movm_args); |
| 759 | return addr; |
| 760 | } |
| 761 | |
| 762 | |
| 763 | /* Function: saved_regs_size |
| 764 | Return the size in bytes of the register save area, based on the |
| 765 | saved_regs array in FI. */ |
| 766 | static int |
| 767 | saved_regs_size (struct frame_info *fi) |
| 768 | { |
| 769 | int adjust = 0; |
| 770 | int i; |
| 771 | |
| 772 | /* Reserve four bytes for every register saved. */ |
| 773 | for (i = 0; i < NUM_REGS; i++) |
| 774 | if (deprecated_get_frame_saved_regs (fi)[i]) |
| 775 | adjust += 4; |
| 776 | |
| 777 | /* If we saved LIR, then it's most likely we used a `movm' |
| 778 | instruction with the `other' bit set, in which case the SP is |
| 779 | decremented by an extra four bytes, "to simplify calculation |
| 780 | of the transfer area", according to the processor manual. */ |
| 781 | if (deprecated_get_frame_saved_regs (fi)[LIR_REGNUM]) |
| 782 | adjust += 4; |
| 783 | |
| 784 | return adjust; |
| 785 | } |
| 786 | |
| 787 | |
| 788 | /* Function: frame_chain |
| 789 | Figure out and return the caller's frame pointer given current |
| 790 | frame_info struct. |
| 791 | |
| 792 | We don't handle dummy frames yet but we would probably just return the |
| 793 | stack pointer that was in use at the time the function call was made? */ |
| 794 | |
| 795 | static CORE_ADDR |
| 796 | mn10300_frame_chain (struct frame_info *fi) |
| 797 | { |
| 798 | struct frame_info *dummy; |
| 799 | /* Walk through the prologue to determine the stack size, |
| 800 | location of saved registers, end of the prologue, etc. */ |
| 801 | if (get_frame_extra_info (fi)->status == 0) |
| 802 | mn10300_analyze_prologue (fi, (CORE_ADDR) 0); |
| 803 | |
| 804 | /* Quit now if mn10300_analyze_prologue set NO_MORE_FRAMES. */ |
| 805 | if (get_frame_extra_info (fi)->status & NO_MORE_FRAMES) |
| 806 | return 0; |
| 807 | |
| 808 | /* Now that we've analyzed our prologue, determine the frame |
| 809 | pointer for our caller. |
| 810 | |
| 811 | If our caller has a frame pointer, then we need to |
| 812 | find the entry value of $a3 to our function. |
| 813 | |
| 814 | If fsr.regs[A3_REGNUM] is nonzero, then it's at the memory |
| 815 | location pointed to by fsr.regs[A3_REGNUM]. |
| 816 | |
| 817 | Else it's still in $a3. |
| 818 | |
| 819 | If our caller does not have a frame pointer, then his |
| 820 | frame base is fi->frame + -caller's stack size. */ |
| 821 | |
| 822 | /* The easiest way to get that info is to analyze our caller's frame. |
| 823 | So we set up a dummy frame and call mn10300_analyze_prologue to |
| 824 | find stuff for us. */ |
| 825 | dummy = analyze_dummy_frame (DEPRECATED_FRAME_SAVED_PC (fi), get_frame_base (fi)); |
| 826 | |
| 827 | if (get_frame_extra_info (dummy)->status & MY_FRAME_IN_FP) |
| 828 | { |
| 829 | /* Our caller has a frame pointer. So find the frame in $a3 or |
| 830 | in the stack. */ |
| 831 | if (deprecated_get_frame_saved_regs (fi)[A3_REGNUM]) |
| 832 | return (read_memory_integer (deprecated_get_frame_saved_regs (fi)[A3_REGNUM], |
| 833 | DEPRECATED_REGISTER_SIZE)); |
| 834 | else |
| 835 | return read_register (A3_REGNUM); |
| 836 | } |
| 837 | else |
| 838 | { |
| 839 | int adjust = saved_regs_size (fi); |
| 840 | |
| 841 | /* Our caller does not have a frame pointer. So his frame starts |
| 842 | at the base of our frame (fi->frame) + register save space |
| 843 | + <his size>. */ |
| 844 | return get_frame_base (fi) + adjust + -get_frame_extra_info (dummy)->stack_size; |
| 845 | } |
| 846 | } |
| 847 | |
| 848 | /* Function: skip_prologue |
| 849 | Return the address of the first inst past the prologue of the function. */ |
| 850 | |
| 851 | static CORE_ADDR |
| 852 | mn10300_skip_prologue (CORE_ADDR pc) |
| 853 | { |
| 854 | /* We used to check the debug symbols, but that can lose if |
| 855 | we have a null prologue. */ |
| 856 | return mn10300_analyze_prologue (NULL, pc); |
| 857 | } |
| 858 | |
| 859 | /* generic_pop_current_frame calls this function if the current |
| 860 | frame isn't a dummy frame. */ |
| 861 | static void |
| 862 | mn10300_pop_frame_regular (struct frame_info *frame) |
| 863 | { |
| 864 | int regnum; |
| 865 | |
| 866 | write_register (PC_REGNUM, DEPRECATED_FRAME_SAVED_PC (frame)); |
| 867 | |
| 868 | /* Restore any saved registers. */ |
| 869 | for (regnum = 0; regnum < NUM_REGS; regnum++) |
| 870 | if (deprecated_get_frame_saved_regs (frame)[regnum] != 0) |
| 871 | { |
| 872 | ULONGEST value; |
| 873 | |
| 874 | value = read_memory_unsigned_integer (deprecated_get_frame_saved_regs (frame)[regnum], |
| 875 | register_size (current_gdbarch, regnum)); |
| 876 | write_register (regnum, value); |
| 877 | } |
| 878 | |
| 879 | /* Actually cut back the stack, adjusted by the saved registers like |
| 880 | ret would. */ |
| 881 | write_register (SP_REGNUM, get_frame_base (frame) + saved_regs_size (frame)); |
| 882 | } |
| 883 | |
| 884 | /* Function: pop_frame |
| 885 | This routine gets called when either the user uses the `return' |
| 886 | command, or the call dummy breakpoint gets hit. */ |
| 887 | static void |
| 888 | mn10300_pop_frame (void) |
| 889 | { |
| 890 | struct frame_info *frame = get_current_frame (); |
| 891 | if (get_frame_type (frame) == DUMMY_FRAME) |
| 892 | /* NOTE: cagney/2002-22-23: Does this ever occure? Surely a dummy |
| 893 | frame will have already been poped by the "infrun.c" code. */ |
| 894 | deprecated_pop_dummy_frame (); |
| 895 | else |
| 896 | mn10300_pop_frame_regular (frame); |
| 897 | /* Throw away any cached frame information. */ |
| 898 | flush_cached_frames (); |
| 899 | } |
| 900 | |
| 901 | /* Function: push_arguments |
| 902 | Setup arguments for a call to the target. Arguments go in |
| 903 | order on the stack. */ |
| 904 | |
| 905 | static CORE_ADDR |
| 906 | mn10300_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
| 907 | int struct_return, CORE_ADDR struct_addr) |
| 908 | { |
| 909 | int argnum = 0; |
| 910 | int len = 0; |
| 911 | int stack_offset = 0; |
| 912 | int regsused = struct_return ? 1 : 0; |
| 913 | |
| 914 | /* This should be a nop, but align the stack just in case something |
| 915 | went wrong. Stacks are four byte aligned on the mn10300. */ |
| 916 | sp &= ~3; |
| 917 | |
| 918 | /* Now make space on the stack for the args. |
| 919 | |
| 920 | XXX This doesn't appear to handle pass-by-invisible reference |
| 921 | arguments. */ |
| 922 | for (argnum = 0; argnum < nargs; argnum++) |
| 923 | { |
| 924 | int arg_length = (TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3; |
| 925 | |
| 926 | while (regsused < 2 && arg_length > 0) |
| 927 | { |
| 928 | regsused++; |
| 929 | arg_length -= 4; |
| 930 | } |
| 931 | len += arg_length; |
| 932 | } |
| 933 | |
| 934 | /* Allocate stack space. */ |
| 935 | sp -= len; |
| 936 | |
| 937 | regsused = struct_return ? 1 : 0; |
| 938 | /* Push all arguments onto the stack. */ |
| 939 | for (argnum = 0; argnum < nargs; argnum++) |
| 940 | { |
| 941 | int len; |
| 942 | char *val; |
| 943 | |
| 944 | /* XXX Check this. What about UNIONS? */ |
| 945 | if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT |
| 946 | && TYPE_LENGTH (VALUE_TYPE (*args)) > 8) |
| 947 | { |
| 948 | /* XXX Wrong, we want a pointer to this argument. */ |
| 949 | len = TYPE_LENGTH (VALUE_TYPE (*args)); |
| 950 | val = (char *) VALUE_CONTENTS (*args); |
| 951 | } |
| 952 | else |
| 953 | { |
| 954 | len = TYPE_LENGTH (VALUE_TYPE (*args)); |
| 955 | val = (char *) VALUE_CONTENTS (*args); |
| 956 | } |
| 957 | |
| 958 | while (regsused < 2 && len > 0) |
| 959 | { |
| 960 | write_register (regsused, extract_unsigned_integer (val, 4)); |
| 961 | val += 4; |
| 962 | len -= 4; |
| 963 | regsused++; |
| 964 | } |
| 965 | |
| 966 | while (len > 0) |
| 967 | { |
| 968 | write_memory (sp + stack_offset, val, 4); |
| 969 | len -= 4; |
| 970 | val += 4; |
| 971 | stack_offset += 4; |
| 972 | } |
| 973 | |
| 974 | args++; |
| 975 | } |
| 976 | |
| 977 | /* Make space for the flushback area. */ |
| 978 | sp -= 8; |
| 979 | return sp; |
| 980 | } |
| 981 | |
| 982 | /* Function: push_return_address (pc) |
| 983 | Set up the return address for the inferior function call. |
| 984 | Needed for targets where we don't actually execute a JSR/BSR instruction */ |
| 985 | |
| 986 | static CORE_ADDR |
| 987 | mn10300_push_return_address (CORE_ADDR pc, CORE_ADDR sp) |
| 988 | { |
| 989 | unsigned char buf[4]; |
| 990 | |
| 991 | store_unsigned_integer (buf, 4, entry_point_address ()); |
| 992 | write_memory (sp - 4, buf, 4); |
| 993 | return sp - 4; |
| 994 | } |
| 995 | |
| 996 | /* Function: store_struct_return (addr,sp) |
| 997 | Store the structure value return address for an inferior function |
| 998 | call. */ |
| 999 | |
| 1000 | static void |
| 1001 | mn10300_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
| 1002 | { |
| 1003 | /* The structure return address is passed as the first argument. */ |
| 1004 | write_register (0, addr); |
| 1005 | } |
| 1006 | |
| 1007 | /* Function: frame_saved_pc |
| 1008 | Find the caller of this frame. We do this by seeing if RP_REGNUM |
| 1009 | is saved in the stack anywhere, otherwise we get it from the |
| 1010 | registers. If the inner frame is a dummy frame, return its PC |
| 1011 | instead of RP, because that's where "caller" of the dummy-frame |
| 1012 | will be found. */ |
| 1013 | |
| 1014 | static CORE_ADDR |
| 1015 | mn10300_frame_saved_pc (struct frame_info *fi) |
| 1016 | { |
| 1017 | int adjust = saved_regs_size (fi); |
| 1018 | |
| 1019 | return (read_memory_integer (get_frame_base (fi) + adjust, |
| 1020 | DEPRECATED_REGISTER_SIZE)); |
| 1021 | } |
| 1022 | |
| 1023 | /* Function: mn10300_init_extra_frame_info |
| 1024 | Setup the frame's frame pointer, pc, and frame addresses for saved |
| 1025 | registers. Most of the work is done in mn10300_analyze_prologue(). |
| 1026 | |
| 1027 | Note that when we are called for the last frame (currently active frame), |
| 1028 | that get_frame_pc (fi) and fi->frame will already be setup. However, fi->frame will |
| 1029 | be valid only if this routine uses FP. For previous frames, fi-frame will |
| 1030 | always be correct. mn10300_analyze_prologue will fix fi->frame if |
| 1031 | it's not valid. |
| 1032 | |
| 1033 | We can be called with the PC in the call dummy under two |
| 1034 | circumstances. First, during normal backtracing, second, while |
| 1035 | figuring out the frame pointer just prior to calling the target |
| 1036 | function (see call_function_by_hand). */ |
| 1037 | |
| 1038 | static void |
| 1039 | mn10300_init_extra_frame_info (int fromleaf, struct frame_info *fi) |
| 1040 | { |
| 1041 | if (get_next_frame (fi)) |
| 1042 | deprecated_update_frame_pc_hack (fi, DEPRECATED_FRAME_SAVED_PC (get_next_frame (fi))); |
| 1043 | |
| 1044 | frame_saved_regs_zalloc (fi); |
| 1045 | frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info)); |
| 1046 | |
| 1047 | get_frame_extra_info (fi)->status = 0; |
| 1048 | get_frame_extra_info (fi)->stack_size = 0; |
| 1049 | |
| 1050 | mn10300_analyze_prologue (fi, 0); |
| 1051 | } |
| 1052 | |
| 1053 | |
| 1054 | /* This function's job is handled by init_extra_frame_info. */ |
| 1055 | static void |
| 1056 | mn10300_frame_init_saved_regs (struct frame_info *frame) |
| 1057 | { |
| 1058 | } |
| 1059 | |
| 1060 | |
| 1061 | /* Function: mn10300_virtual_frame_pointer |
| 1062 | Return the register that the function uses for a frame pointer, |
| 1063 | plus any necessary offset to be applied to the register before |
| 1064 | any frame pointer offsets. */ |
| 1065 | |
| 1066 | static void |
| 1067 | mn10300_virtual_frame_pointer (CORE_ADDR pc, |
| 1068 | int *reg, |
| 1069 | LONGEST *offset) |
| 1070 | { |
| 1071 | struct frame_info *dummy = analyze_dummy_frame (pc, 0); |
| 1072 | /* Set up a dummy frame_info, Analyze the prolog and fill in the |
| 1073 | extra info. */ |
| 1074 | /* Results will tell us which type of frame it uses. */ |
| 1075 | if (get_frame_extra_info (dummy)->status & MY_FRAME_IN_SP) |
| 1076 | { |
| 1077 | *reg = SP_REGNUM; |
| 1078 | *offset = -(get_frame_extra_info (dummy)->stack_size); |
| 1079 | } |
| 1080 | else |
| 1081 | { |
| 1082 | *reg = A3_REGNUM; |
| 1083 | *offset = 0; |
| 1084 | } |
| 1085 | } |
| 1086 | |
| 1087 | static int |
| 1088 | mn10300_reg_struct_has_addr (int gcc_p, struct type *type) |
| 1089 | { |
| 1090 | return (TYPE_LENGTH (type) > 8); |
| 1091 | } |
| 1092 | |
| 1093 | static struct type * |
| 1094 | mn10300_register_virtual_type (int reg) |
| 1095 | { |
| 1096 | return builtin_type_int; |
| 1097 | } |
| 1098 | |
| 1099 | static int |
| 1100 | mn10300_register_byte (int reg) |
| 1101 | { |
| 1102 | return (reg * 4); |
| 1103 | } |
| 1104 | |
| 1105 | static int |
| 1106 | mn10300_register_virtual_size (int reg) |
| 1107 | { |
| 1108 | return 4; |
| 1109 | } |
| 1110 | |
| 1111 | static int |
| 1112 | mn10300_register_raw_size (int reg) |
| 1113 | { |
| 1114 | return 4; |
| 1115 | } |
| 1116 | |
| 1117 | /* If DWARF2 is a register number appearing in Dwarf2 debug info, then |
| 1118 | mn10300_dwarf2_reg_to_regnum (DWARF2) is the corresponding GDB |
| 1119 | register number. Why don't Dwarf2 and GDB use the same numbering? |
| 1120 | Who knows? But since people have object files lying around with |
| 1121 | the existing Dwarf2 numbering, and other people have written stubs |
| 1122 | to work with the existing GDB, neither of them can change. So we |
| 1123 | just have to cope. */ |
| 1124 | static int |
| 1125 | mn10300_dwarf2_reg_to_regnum (int dwarf2) |
| 1126 | { |
| 1127 | /* This table is supposed to be shaped like the REGISTER_NAMES |
| 1128 | initializer in gcc/config/mn10300/mn10300.h. Registers which |
| 1129 | appear in GCC's numbering, but have no counterpart in GDB's |
| 1130 | world, are marked with a -1. */ |
| 1131 | static int dwarf2_to_gdb[] = { |
| 1132 | 0, 1, 2, 3, 4, 5, 6, 7, -1, 8, |
| 1133 | 15, 16, 17, 18, 19, 20, 21, 22 |
| 1134 | }; |
| 1135 | int gdb; |
| 1136 | |
| 1137 | if (dwarf2 < 0 |
| 1138 | || dwarf2 >= (sizeof (dwarf2_to_gdb) / sizeof (dwarf2_to_gdb[0])) |
| 1139 | || dwarf2_to_gdb[dwarf2] == -1) |
| 1140 | internal_error (__FILE__, __LINE__, |
| 1141 | "bogus register number in debug info: %d", dwarf2); |
| 1142 | |
| 1143 | return dwarf2_to_gdb[dwarf2]; |
| 1144 | } |
| 1145 | |
| 1146 | static void |
| 1147 | mn10300_print_register (const char *name, int regnum, int reg_width) |
| 1148 | { |
| 1149 | char raw_buffer[MAX_REGISTER_SIZE]; |
| 1150 | |
| 1151 | if (reg_width) |
| 1152 | printf_filtered ("%*s: ", reg_width, name); |
| 1153 | else |
| 1154 | printf_filtered ("%s: ", name); |
| 1155 | |
| 1156 | /* Get the data */ |
| 1157 | if (!frame_register_read (deprecated_selected_frame, regnum, raw_buffer)) |
| 1158 | { |
| 1159 | printf_filtered ("[invalid]"); |
| 1160 | return; |
| 1161 | } |
| 1162 | else |
| 1163 | { |
| 1164 | int byte; |
| 1165 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 1166 | { |
| 1167 | for (byte = register_size (current_gdbarch, regnum) - DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum); |
| 1168 | byte < register_size (current_gdbarch, regnum); |
| 1169 | byte++) |
| 1170 | printf_filtered ("%02x", (unsigned char) raw_buffer[byte]); |
| 1171 | } |
| 1172 | else |
| 1173 | { |
| 1174 | for (byte = DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum) - 1; |
| 1175 | byte >= 0; |
| 1176 | byte--) |
| 1177 | printf_filtered ("%02x", (unsigned char) raw_buffer[byte]); |
| 1178 | } |
| 1179 | } |
| 1180 | } |
| 1181 | |
| 1182 | static void |
| 1183 | mn10300_do_registers_info (int regnum, int fpregs) |
| 1184 | { |
| 1185 | if (regnum >= 0) |
| 1186 | { |
| 1187 | const char *name = REGISTER_NAME (regnum); |
| 1188 | if (name == NULL || name[0] == '\0') |
| 1189 | error ("Not a valid register for the current processor type"); |
| 1190 | mn10300_print_register (name, regnum, 0); |
| 1191 | printf_filtered ("\n"); |
| 1192 | } |
| 1193 | else |
| 1194 | { |
| 1195 | /* print registers in an array 4x8 */ |
| 1196 | int r; |
| 1197 | int reg; |
| 1198 | const int nr_in_row = 4; |
| 1199 | const int reg_width = 4; |
| 1200 | for (r = 0; r < NUM_REGS; r += nr_in_row) |
| 1201 | { |
| 1202 | int c; |
| 1203 | int printing = 0; |
| 1204 | int padding = 0; |
| 1205 | for (c = r; c < r + nr_in_row; c++) |
| 1206 | { |
| 1207 | const char *name = REGISTER_NAME (c); |
| 1208 | if (name != NULL && *name != '\0') |
| 1209 | { |
| 1210 | printing = 1; |
| 1211 | while (padding > 0) |
| 1212 | { |
| 1213 | printf_filtered (" "); |
| 1214 | padding--; |
| 1215 | } |
| 1216 | mn10300_print_register (name, c, reg_width); |
| 1217 | printf_filtered (" "); |
| 1218 | } |
| 1219 | else |
| 1220 | { |
| 1221 | padding += (reg_width + 2 + 8 + 1); |
| 1222 | } |
| 1223 | } |
| 1224 | if (printing) |
| 1225 | printf_filtered ("\n"); |
| 1226 | } |
| 1227 | } |
| 1228 | } |
| 1229 | |
| 1230 | static CORE_ADDR |
| 1231 | mn10300_read_fp (void) |
| 1232 | { |
| 1233 | /* That's right, we're using the stack pointer as our frame pointer. */ |
| 1234 | gdb_assert (SP_REGNUM >= 0); |
| 1235 | return read_register (SP_REGNUM); |
| 1236 | } |
| 1237 | |
| 1238 | /* Dump out the mn10300 speciic architecture information. */ |
| 1239 | |
| 1240 | static void |
| 1241 | mn10300_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) |
| 1242 | { |
| 1243 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 1244 | fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n", |
| 1245 | tdep->am33_mode); |
| 1246 | } |
| 1247 | |
| 1248 | static struct gdbarch * |
| 1249 | mn10300_gdbarch_init (struct gdbarch_info info, |
| 1250 | struct gdbarch_list *arches) |
| 1251 | { |
| 1252 | struct gdbarch *gdbarch; |
| 1253 | struct gdbarch_tdep *tdep = NULL; |
| 1254 | int am33_mode; |
| 1255 | gdbarch_register_name_ftype *register_name; |
| 1256 | int mach; |
| 1257 | int num_regs; |
| 1258 | |
| 1259 | arches = gdbarch_list_lookup_by_info (arches, &info); |
| 1260 | if (arches != NULL) |
| 1261 | return arches->gdbarch; |
| 1262 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); |
| 1263 | gdbarch = gdbarch_alloc (&info, tdep); |
| 1264 | |
| 1265 | if (info.bfd_arch_info != NULL |
| 1266 | && info.bfd_arch_info->arch == bfd_arch_mn10300) |
| 1267 | mach = info.bfd_arch_info->mach; |
| 1268 | else |
| 1269 | mach = 0; |
| 1270 | switch (mach) |
| 1271 | { |
| 1272 | case 0: |
| 1273 | case bfd_mach_mn10300: |
| 1274 | am33_mode = 0; |
| 1275 | register_name = mn10300_generic_register_name; |
| 1276 | num_regs = 32; |
| 1277 | break; |
| 1278 | case bfd_mach_am33: |
| 1279 | am33_mode = 1; |
| 1280 | register_name = am33_register_name; |
| 1281 | num_regs = 32; |
| 1282 | break; |
| 1283 | default: |
| 1284 | internal_error (__FILE__, __LINE__, |
| 1285 | "mn10300_gdbarch_init: Unknown mn10300 variant"); |
| 1286 | return NULL; /* keep GCC happy. */ |
| 1287 | } |
| 1288 | |
| 1289 | /* Registers. */ |
| 1290 | set_gdbarch_num_regs (gdbarch, num_regs); |
| 1291 | set_gdbarch_register_name (gdbarch, register_name); |
| 1292 | set_gdbarch_deprecated_register_size (gdbarch, 4); |
| 1293 | set_gdbarch_deprecated_register_raw_size (gdbarch, mn10300_register_raw_size); |
| 1294 | set_gdbarch_deprecated_register_byte (gdbarch, mn10300_register_byte); |
| 1295 | set_gdbarch_deprecated_register_virtual_size (gdbarch, mn10300_register_virtual_size); |
| 1296 | set_gdbarch_deprecated_register_virtual_type (gdbarch, mn10300_register_virtual_type); |
| 1297 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, mn10300_dwarf2_reg_to_regnum); |
| 1298 | set_gdbarch_deprecated_do_registers_info (gdbarch, mn10300_do_registers_info); |
| 1299 | set_gdbarch_sp_regnum (gdbarch, 8); |
| 1300 | set_gdbarch_pc_regnum (gdbarch, 9); |
| 1301 | set_gdbarch_deprecated_fp_regnum (gdbarch, 31); |
| 1302 | set_gdbarch_virtual_frame_pointer (gdbarch, mn10300_virtual_frame_pointer); |
| 1303 | |
| 1304 | /* Breakpoints. */ |
| 1305 | set_gdbarch_breakpoint_from_pc (gdbarch, mn10300_breakpoint_from_pc); |
| 1306 | |
| 1307 | /* Stack unwinding. */ |
| 1308 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 1309 | set_gdbarch_deprecated_saved_pc_after_call (gdbarch, mn10300_saved_pc_after_call); |
| 1310 | set_gdbarch_deprecated_init_extra_frame_info (gdbarch, mn10300_init_extra_frame_info); |
| 1311 | set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, mn10300_frame_init_saved_regs); |
| 1312 | set_gdbarch_deprecated_frame_chain (gdbarch, mn10300_frame_chain); |
| 1313 | set_gdbarch_deprecated_frame_saved_pc (gdbarch, mn10300_frame_saved_pc); |
| 1314 | set_gdbarch_return_value (gdbarch, mn10300_return_value); |
| 1315 | set_gdbarch_deprecated_store_struct_return (gdbarch, mn10300_store_struct_return); |
| 1316 | set_gdbarch_deprecated_pop_frame (gdbarch, mn10300_pop_frame); |
| 1317 | set_gdbarch_skip_prologue (gdbarch, mn10300_skip_prologue); |
| 1318 | /* That's right, we're using the stack pointer as our frame pointer. */ |
| 1319 | set_gdbarch_deprecated_target_read_fp (gdbarch, mn10300_read_fp); |
| 1320 | |
| 1321 | /* Calling functions in the inferior from GDB. */ |
| 1322 | set_gdbarch_deprecated_push_arguments (gdbarch, mn10300_push_arguments); |
| 1323 | set_gdbarch_deprecated_reg_struct_has_addr |
| 1324 | (gdbarch, mn10300_reg_struct_has_addr); |
| 1325 | set_gdbarch_deprecated_push_return_address (gdbarch, mn10300_push_return_address); |
| 1326 | |
| 1327 | tdep->am33_mode = am33_mode; |
| 1328 | |
| 1329 | /* Should be using push_dummy_call. */ |
| 1330 | set_gdbarch_deprecated_dummy_write_sp (gdbarch, deprecated_write_sp); |
| 1331 | |
| 1332 | set_gdbarch_print_insn (gdbarch, print_insn_mn10300); |
| 1333 | |
| 1334 | return gdbarch; |
| 1335 | } |
| 1336 | |
| 1337 | void |
| 1338 | _initialize_mn10300_tdep (void) |
| 1339 | { |
| 1340 | /* printf("_initialize_mn10300_tdep\n"); */ |
| 1341 | gdbarch_register (bfd_arch_mn10300, mn10300_gdbarch_init, mn10300_dump_tdep); |
| 1342 | } |