| 1 | /* Target-machine dependent code for Renesas H8/300, for GDB. |
| 2 | |
| 3 | Copyright 1988, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, |
| 4 | 1999, 2000, 2001, 2002, 2003 Free 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 | /* |
| 24 | Contributed by Steve Chamberlain |
| 25 | sac@cygnus.com |
| 26 | */ |
| 27 | |
| 28 | #include "defs.h" |
| 29 | #include "value.h" |
| 30 | #include "inferior.h" |
| 31 | #include "symfile.h" |
| 32 | #include "arch-utils.h" |
| 33 | #include "regcache.h" |
| 34 | #include "gdbcore.h" |
| 35 | #include "objfiles.h" |
| 36 | #include "gdbcmd.h" |
| 37 | #include "gdb_assert.h" |
| 38 | #include "dis-asm.h" |
| 39 | |
| 40 | /* Extra info which is saved in each frame_info. */ |
| 41 | struct frame_extra_info |
| 42 | { |
| 43 | CORE_ADDR from_pc; |
| 44 | }; |
| 45 | |
| 46 | enum |
| 47 | { |
| 48 | h8300_reg_size = 2, |
| 49 | h8300h_reg_size = 4, |
| 50 | h8300_max_reg_size = 4, |
| 51 | }; |
| 52 | #define BINWORD (h8300hmode && !h8300_normal_mode ? h8300h_reg_size : h8300_reg_size) |
| 53 | |
| 54 | enum gdb_regnum |
| 55 | { |
| 56 | E_R0_REGNUM, E_ER0_REGNUM = E_R0_REGNUM, E_ARG0_REGNUM = E_R0_REGNUM, |
| 57 | E_RET0_REGNUM = E_R0_REGNUM, |
| 58 | E_R1_REGNUM, E_ER1_REGNUM = E_R1_REGNUM, E_RET1_REGNUM = E_R1_REGNUM, |
| 59 | E_R2_REGNUM, E_ER2_REGNUM = E_R2_REGNUM, E_ARGLAST_REGNUM = E_R2_REGNUM, |
| 60 | E_R3_REGNUM, E_ER3_REGNUM = E_R3_REGNUM, |
| 61 | E_R4_REGNUM, E_ER4_REGNUM = E_R4_REGNUM, |
| 62 | E_R5_REGNUM, E_ER5_REGNUM = E_R5_REGNUM, |
| 63 | E_R6_REGNUM, E_ER6_REGNUM = E_R6_REGNUM, E_FP_REGNUM = E_R6_REGNUM, |
| 64 | E_SP_REGNUM, |
| 65 | E_CCR_REGNUM, |
| 66 | E_PC_REGNUM, |
| 67 | E_CYCLES_REGNUM, |
| 68 | E_TICK_REGNUM, E_EXR_REGNUM = E_TICK_REGNUM, |
| 69 | E_INST_REGNUM, E_TICKS_REGNUM = E_INST_REGNUM, |
| 70 | E_INSTS_REGNUM, |
| 71 | E_MACH_REGNUM, |
| 72 | E_MACL_REGNUM, |
| 73 | E_SBR_REGNUM, |
| 74 | E_VBR_REGNUM |
| 75 | }; |
| 76 | |
| 77 | #define E_PSEUDO_CCR_REGNUM (NUM_REGS) |
| 78 | #define E_PSEUDO_EXR_REGNUM (NUM_REGS+1) |
| 79 | |
| 80 | #define UNSIGNED_SHORT(X) ((X) & 0xffff) |
| 81 | |
| 82 | #define IS_PUSH(x) ((x & 0xfff0)==0x6df0) |
| 83 | #define IS_PUSH_FP(x) (x == 0x6df6) |
| 84 | #define IS_MOVE_FP(x) (x == 0x0d76 || x == 0x0ff6) |
| 85 | #define IS_MOV_SP_FP(x) (x == 0x0d76 || x == 0x0ff6) |
| 86 | #define IS_SUB2_SP(x) (x==0x1b87) |
| 87 | #define IS_SUB4_SP(x) (x==0x1b97) |
| 88 | #define IS_SUBL_SP(x) (x==0x7a37) |
| 89 | #define IS_MOVK_R5(x) (x==0x7905) |
| 90 | #define IS_SUB_R5SP(x) (x==0x1957) |
| 91 | |
| 92 | /* If the instruction at PC is an argument register spill, return its |
| 93 | length. Otherwise, return zero. |
| 94 | |
| 95 | An argument register spill is an instruction that moves an argument |
| 96 | from the register in which it was passed to the stack slot in which |
| 97 | it really lives. It is a byte, word, or longword move from an |
| 98 | argument register to a negative offset from the frame pointer. |
| 99 | |
| 100 | CV, 2003-06-16: Or, in optimized code or when the `register' qualifier |
| 101 | is used, it could be a byte, word or long move to registers r3-r5. */ |
| 102 | |
| 103 | static int |
| 104 | h8300_is_argument_spill (CORE_ADDR pc) |
| 105 | { |
| 106 | int w = read_memory_unsigned_integer (pc, 2); |
| 107 | |
| 108 | if (((w & 0xff88) == 0x0c88 /* mov.b Rsl, Rdl */ |
| 109 | || (w & 0xff88) == 0x0d00 /* mov.w Rs, Rd */ |
| 110 | || (w & 0xff88) == 0x0f80) /* mov.l Rs, Rd */ |
| 111 | && (w & 0x70) <= 0x20 /* Rs is R0, R1 or R2 */ |
| 112 | && (w & 0x7) >= 0x3 && (w & 0x7) <= 0x5)/* Rd is R3, R4 or R5 */ |
| 113 | return 2; |
| 114 | |
| 115 | if ((w & 0xfff0) == 0x6ee0 /* mov.b Rs,@(d:16,er6) */ |
| 116 | && 8 <= (w & 0xf) && (w & 0xf) <= 10) /* Rs is R0L, R1L, or R2L */ |
| 117 | { |
| 118 | int w2 = read_memory_integer (pc + 2, 2); |
| 119 | |
| 120 | /* ... and d:16 is negative. */ |
| 121 | if (w2 < 0) |
| 122 | return 4; |
| 123 | } |
| 124 | else if (w == 0x7860) |
| 125 | { |
| 126 | int w2 = read_memory_integer (pc + 2, 2); |
| 127 | |
| 128 | if ((w2 & 0xfff0) == 0x6aa0) /* mov.b Rs, @(d:24,er6) */ |
| 129 | { |
| 130 | LONGEST disp = read_memory_integer (pc + 4, 4); |
| 131 | |
| 132 | /* ... and d:24 is negative. */ |
| 133 | if (disp < 0 && disp > 0xffffff) |
| 134 | return 8; |
| 135 | } |
| 136 | } |
| 137 | else if ((w & 0xfff0) == 0x6fe0 /* mov.w Rs,@(d:16,er6) */ |
| 138 | && (w & 0xf) <= 2) /* Rs is R0, R1, or R2 */ |
| 139 | { |
| 140 | int w2 = read_memory_integer (pc + 2, 2); |
| 141 | |
| 142 | /* ... and d:16 is negative. */ |
| 143 | if (w2 < 0) |
| 144 | return 4; |
| 145 | } |
| 146 | else if (w == 0x78e0) |
| 147 | { |
| 148 | int w2 = read_memory_integer (pc + 2, 2); |
| 149 | |
| 150 | if ((w2 & 0xfff0) == 0x6ba0) /* mov.b Rs, @(d:24,er6) */ |
| 151 | { |
| 152 | LONGEST disp = read_memory_integer (pc + 4, 4); |
| 153 | |
| 154 | /* ... and d:24 is negative. */ |
| 155 | if (disp < 0 && disp > 0xffffff) |
| 156 | return 8; |
| 157 | } |
| 158 | } |
| 159 | else if (w == 0x0100) |
| 160 | { |
| 161 | int w2 = read_memory_integer (pc + 2, 2); |
| 162 | |
| 163 | if ((w2 & 0xfff0) == 0x6fe0 /* mov.l Rs,@(d:16,er6) */ |
| 164 | && (w2 & 0xf) <= 2) /* Rs is ER0, ER1, or ER2 */ |
| 165 | { |
| 166 | int w3 = read_memory_integer (pc + 4, 2); |
| 167 | |
| 168 | /* ... and d:16 is negative. */ |
| 169 | if (w3 < 0) |
| 170 | return 6; |
| 171 | } |
| 172 | else if (w2 == 0x78e0) |
| 173 | { |
| 174 | int w3 = read_memory_integer (pc + 4, 2); |
| 175 | |
| 176 | if ((w3 & 0xfff0) == 0x6ba0) /* mov.l Rs, @(d:24,er6) */ |
| 177 | { |
| 178 | LONGEST disp = read_memory_integer (pc + 6, 4); |
| 179 | |
| 180 | /* ... and d:24 is negative. */ |
| 181 | if (disp < 0 && disp > 0xffffff) |
| 182 | return 10; |
| 183 | } |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | static CORE_ADDR |
| 191 | h8300_skip_prologue (CORE_ADDR start_pc) |
| 192 | { |
| 193 | short int w; |
| 194 | int adjust = 0; |
| 195 | |
| 196 | /* Skip past all push and stm insns. */ |
| 197 | while (1) |
| 198 | { |
| 199 | w = read_memory_unsigned_integer (start_pc, 2); |
| 200 | /* First look for push insns. */ |
| 201 | if (w == 0x0100 || w == 0x0110 || w == 0x0120 || w == 0x0130) |
| 202 | { |
| 203 | w = read_memory_unsigned_integer (start_pc + 2, 2); |
| 204 | adjust = 2; |
| 205 | } |
| 206 | |
| 207 | if (IS_PUSH (w)) |
| 208 | { |
| 209 | start_pc += 2 + adjust; |
| 210 | w = read_memory_unsigned_integer (start_pc, 2); |
| 211 | continue; |
| 212 | } |
| 213 | adjust = 0; |
| 214 | break; |
| 215 | } |
| 216 | |
| 217 | /* Skip past a move to FP, either word or long sized */ |
| 218 | w = read_memory_unsigned_integer (start_pc, 2); |
| 219 | if (w == 0x0100) |
| 220 | { |
| 221 | w = read_memory_unsigned_integer (start_pc + 2, 2); |
| 222 | adjust += 2; |
| 223 | } |
| 224 | |
| 225 | if (IS_MOVE_FP (w)) |
| 226 | { |
| 227 | start_pc += 2 + adjust; |
| 228 | w = read_memory_unsigned_integer (start_pc, 2); |
| 229 | } |
| 230 | |
| 231 | /* Check for loading either a word constant into r5; |
| 232 | long versions are handled by the SUBL_SP below. */ |
| 233 | if (IS_MOVK_R5 (w)) |
| 234 | { |
| 235 | start_pc += 2; |
| 236 | w = read_memory_unsigned_integer (start_pc, 2); |
| 237 | } |
| 238 | |
| 239 | /* Now check for subtracting r5 from sp, word sized only. */ |
| 240 | if (IS_SUB_R5SP (w)) |
| 241 | { |
| 242 | start_pc += 2 + adjust; |
| 243 | w = read_memory_unsigned_integer (start_pc, 2); |
| 244 | } |
| 245 | |
| 246 | /* Check for subs #2 and subs #4. */ |
| 247 | while (IS_SUB2_SP (w) || IS_SUB4_SP (w)) |
| 248 | { |
| 249 | start_pc += 2 + adjust; |
| 250 | w = read_memory_unsigned_integer (start_pc, 2); |
| 251 | } |
| 252 | |
| 253 | /* Check for a 32bit subtract. */ |
| 254 | if (IS_SUBL_SP (w)) |
| 255 | start_pc += 6 + adjust; |
| 256 | |
| 257 | /* Skip past another possible stm insn for registers R3 to R5 (possibly used |
| 258 | for register qualified arguments. */ |
| 259 | w = read_memory_unsigned_integer (start_pc, 2); |
| 260 | /* First look for push insns. */ |
| 261 | if (w == 0x0110 || w == 0x0120 || w == 0x0130) |
| 262 | { |
| 263 | w = read_memory_unsigned_integer (start_pc + 2, 2); |
| 264 | if (IS_PUSH (w) && (w & 0xf) >= 0x3 && (w & 0xf) <= 0x5) |
| 265 | start_pc += 4; |
| 266 | } |
| 267 | |
| 268 | /* Check for spilling an argument register to the stack frame. |
| 269 | This could also be an initializing store from non-prologue code, |
| 270 | but I don't think there's any harm in skipping that. */ |
| 271 | for (;;) |
| 272 | { |
| 273 | int spill_size = h8300_is_argument_spill (start_pc); |
| 274 | if (spill_size == 0) |
| 275 | break; |
| 276 | start_pc += spill_size; |
| 277 | } |
| 278 | |
| 279 | return start_pc; |
| 280 | } |
| 281 | |
| 282 | /* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or |
| 283 | is not the address of a valid instruction, the address of the next |
| 284 | instruction beyond ADDR otherwise. *PWORD1 receives the first word |
| 285 | of the instruction. */ |
| 286 | |
| 287 | static CORE_ADDR |
| 288 | h8300_next_prologue_insn (CORE_ADDR addr, |
| 289 | CORE_ADDR lim, |
| 290 | unsigned short* pword1) |
| 291 | { |
| 292 | char buf[2]; |
| 293 | if (addr < lim + 8) |
| 294 | { |
| 295 | read_memory (addr, buf, 2); |
| 296 | *pword1 = extract_signed_integer (buf, 2); |
| 297 | |
| 298 | return addr + 2; |
| 299 | } |
| 300 | return 0; |
| 301 | } |
| 302 | |
| 303 | /* Examine the prologue of a function. `ip' points to the first instruction. |
| 304 | `limit' is the limit of the prologue (e.g. the addr of the first |
| 305 | linenumber, or perhaps the program counter if we're stepping through). |
| 306 | `frame_sp' is the stack pointer value in use in this frame. |
| 307 | `fsr' is a pointer to a frame_saved_regs structure into which we put |
| 308 | info about the registers saved by this frame. |
| 309 | `fi' is a struct frame_info pointer; we fill in various fields in it |
| 310 | to reflect the offsets of the arg pointer and the locals pointer. */ |
| 311 | |
| 312 | /* Any function with a frame looks like this |
| 313 | SECOND ARG |
| 314 | FIRST ARG |
| 315 | RET PC |
| 316 | SAVED R2 |
| 317 | SAVED R3 |
| 318 | SAVED FP <-FP POINTS HERE |
| 319 | LOCALS0 |
| 320 | LOCALS1 <-SP POINTS HERE |
| 321 | */ |
| 322 | |
| 323 | static CORE_ADDR |
| 324 | h8300_examine_prologue (CORE_ADDR ip, CORE_ADDR limit, |
| 325 | CORE_ADDR after_prolog_fp, CORE_ADDR *fsr, |
| 326 | struct frame_info *fi) |
| 327 | { |
| 328 | CORE_ADDR next_ip; |
| 329 | int r; |
| 330 | int have_fp = 0; |
| 331 | unsigned short insn_word; |
| 332 | /* Number of things pushed onto stack, starts at 2/4, 'cause the |
| 333 | PC is already there */ |
| 334 | unsigned int reg_save_depth = BINWORD; |
| 335 | |
| 336 | unsigned int auto_depth = 0; /* Number of bytes of autos */ |
| 337 | |
| 338 | char in_frame[11]; /* One for each reg */ |
| 339 | |
| 340 | int adjust = 0; |
| 341 | |
| 342 | memset (in_frame, 1, 11); |
| 343 | for (r = 0; r < 8; r++) |
| 344 | { |
| 345 | fsr[r] = 0; |
| 346 | } |
| 347 | if (after_prolog_fp == 0) |
| 348 | { |
| 349 | after_prolog_fp = read_register (E_SP_REGNUM); |
| 350 | } |
| 351 | |
| 352 | /* If the PC isn't valid, quit now. */ |
| 353 | if (ip == 0 || ip & (h8300hmode && !h8300_normal_mode ? ~0xffffff : ~0xffff)) |
| 354 | return 0; |
| 355 | |
| 356 | next_ip = h8300_next_prologue_insn (ip, limit, &insn_word); |
| 357 | |
| 358 | if (insn_word == 0x0100) /* mov.l */ |
| 359 | { |
| 360 | insn_word = read_memory_unsigned_integer (ip + 2, 2); |
| 361 | adjust = 2; |
| 362 | } |
| 363 | |
| 364 | /* Skip over any fp push instructions */ |
| 365 | fsr[E_FP_REGNUM] = after_prolog_fp; |
| 366 | while (next_ip && IS_PUSH_FP (insn_word)) |
| 367 | { |
| 368 | ip = next_ip + adjust; |
| 369 | |
| 370 | in_frame[insn_word & 0x7] = reg_save_depth; |
| 371 | next_ip = h8300_next_prologue_insn (ip, limit, &insn_word); |
| 372 | reg_save_depth += 2 + adjust; |
| 373 | } |
| 374 | |
| 375 | /* Is this a move into the fp */ |
| 376 | if (next_ip && IS_MOV_SP_FP (insn_word)) |
| 377 | { |
| 378 | ip = next_ip; |
| 379 | next_ip = h8300_next_prologue_insn (ip, limit, &insn_word); |
| 380 | have_fp = 1; |
| 381 | } |
| 382 | |
| 383 | /* Skip over any stack adjustment, happens either with a number of |
| 384 | sub#2,sp or a mov #x,r5 sub r5,sp */ |
| 385 | |
| 386 | if (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word))) |
| 387 | { |
| 388 | while (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word))) |
| 389 | { |
| 390 | auto_depth += IS_SUB2_SP (insn_word) ? 2 : 4; |
| 391 | ip = next_ip; |
| 392 | next_ip = h8300_next_prologue_insn (ip, limit, &insn_word); |
| 393 | } |
| 394 | } |
| 395 | else |
| 396 | { |
| 397 | if (next_ip && IS_MOVK_R5 (insn_word)) |
| 398 | { |
| 399 | ip = next_ip; |
| 400 | next_ip = h8300_next_prologue_insn (ip, limit, &insn_word); |
| 401 | auto_depth += insn_word; |
| 402 | |
| 403 | next_ip = h8300_next_prologue_insn (next_ip, limit, &insn_word); |
| 404 | auto_depth += insn_word; |
| 405 | } |
| 406 | if (next_ip && IS_SUBL_SP (insn_word)) |
| 407 | { |
| 408 | ip = next_ip; |
| 409 | auto_depth += read_memory_unsigned_integer (ip, 4); |
| 410 | ip += 4; |
| 411 | |
| 412 | next_ip = h8300_next_prologue_insn (ip, limit, &insn_word); |
| 413 | } |
| 414 | } |
| 415 | |
| 416 | /* Now examine the push insns to determine where everything lives |
| 417 | on the stack. */ |
| 418 | while (1) |
| 419 | { |
| 420 | adjust = 0; |
| 421 | if (!next_ip) |
| 422 | break; |
| 423 | |
| 424 | if (insn_word == 0x0100) |
| 425 | { |
| 426 | ip = next_ip; |
| 427 | next_ip = h8300_next_prologue_insn (ip, limit, &insn_word); |
| 428 | adjust = 2; |
| 429 | } |
| 430 | |
| 431 | if (IS_PUSH (insn_word)) |
| 432 | { |
| 433 | auto_depth += 2 + adjust; |
| 434 | fsr[insn_word & 0x7] = after_prolog_fp - auto_depth; |
| 435 | ip = next_ip; |
| 436 | next_ip = h8300_next_prologue_insn (ip, limit, &insn_word); |
| 437 | continue; |
| 438 | } |
| 439 | |
| 440 | /* Now check for push multiple insns. */ |
| 441 | if (insn_word == 0x0110 || insn_word == 0x0120 || insn_word == 0x0130) |
| 442 | { |
| 443 | int count = ((insn_word >> 4) & 0xf) + 1; |
| 444 | int start, i; |
| 445 | |
| 446 | ip = next_ip; |
| 447 | next_ip = h8300_next_prologue_insn (ip, limit, &insn_word); |
| 448 | start = insn_word & 0x7; |
| 449 | |
| 450 | for (i = start; i < start + count; i++) |
| 451 | { |
| 452 | auto_depth += 4; |
| 453 | fsr[i] = after_prolog_fp - auto_depth; |
| 454 | } |
| 455 | } |
| 456 | break; |
| 457 | } |
| 458 | |
| 459 | /* The PC is at a known place */ |
| 460 | get_frame_extra_info (fi)->from_pc = |
| 461 | read_memory_unsigned_integer (after_prolog_fp + BINWORD, BINWORD); |
| 462 | |
| 463 | /* Rememeber any others too */ |
| 464 | in_frame[E_PC_REGNUM] = 0; |
| 465 | |
| 466 | if (have_fp) |
| 467 | /* We keep the old FP in the SP spot */ |
| 468 | fsr[E_SP_REGNUM] = read_memory_unsigned_integer (fsr[E_FP_REGNUM], |
| 469 | BINWORD); |
| 470 | else |
| 471 | fsr[E_SP_REGNUM] = after_prolog_fp + auto_depth; |
| 472 | |
| 473 | return (ip); |
| 474 | } |
| 475 | |
| 476 | static void |
| 477 | h8300_frame_init_saved_regs (struct frame_info *fi) |
| 478 | { |
| 479 | CORE_ADDR func_addr, func_end; |
| 480 | |
| 481 | if (!deprecated_get_frame_saved_regs (fi)) |
| 482 | { |
| 483 | frame_saved_regs_zalloc (fi); |
| 484 | |
| 485 | /* Find the beginning of this function, so we can analyze its |
| 486 | prologue. */ |
| 487 | if (find_pc_partial_function (get_frame_pc (fi), NULL, |
| 488 | &func_addr, &func_end)) |
| 489 | { |
| 490 | struct symtab_and_line sal = find_pc_line (func_addr, 0); |
| 491 | CORE_ADDR limit = (sal.end && sal.end < get_frame_pc (fi)) |
| 492 | ? sal.end : get_frame_pc (fi); |
| 493 | /* This will fill in fields in fi. */ |
| 494 | h8300_examine_prologue (func_addr, limit, get_frame_base (fi), |
| 495 | deprecated_get_frame_saved_regs (fi), fi); |
| 496 | } |
| 497 | /* Else we're out of luck (can't debug completely stripped code). |
| 498 | FIXME. */ |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | /* Given a GDB frame, determine the address of the calling function's |
| 503 | frame. This will be used to create a new GDB frame struct, and |
| 504 | then DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC |
| 505 | will be called for the new frame. |
| 506 | |
| 507 | For us, the frame address is its stack pointer value, so we look up |
| 508 | the function prologue to determine the caller's sp value, and |
| 509 | return it. */ |
| 510 | |
| 511 | static CORE_ADDR |
| 512 | h8300_frame_chain (struct frame_info *thisframe) |
| 513 | { |
| 514 | if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (thisframe), |
| 515 | get_frame_base (thisframe), |
| 516 | get_frame_base (thisframe))) |
| 517 | { /* initialize the from_pc now */ |
| 518 | get_frame_extra_info (thisframe)->from_pc = |
| 519 | deprecated_read_register_dummy (get_frame_pc (thisframe), |
| 520 | get_frame_base (thisframe), |
| 521 | E_PC_REGNUM); |
| 522 | return get_frame_base (thisframe); |
| 523 | } |
| 524 | return deprecated_get_frame_saved_regs (thisframe)[E_SP_REGNUM]; |
| 525 | } |
| 526 | |
| 527 | /* Return the saved PC from this frame. |
| 528 | |
| 529 | If the frame has a memory copy of SRP_REGNUM, use that. If not, |
| 530 | just use the register SRP_REGNUM itself. */ |
| 531 | |
| 532 | static CORE_ADDR |
| 533 | h8300_frame_saved_pc (struct frame_info *frame) |
| 534 | { |
| 535 | if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame), |
| 536 | get_frame_base (frame), |
| 537 | get_frame_base (frame))) |
| 538 | return deprecated_read_register_dummy (get_frame_pc (frame), |
| 539 | get_frame_base (frame), |
| 540 | E_PC_REGNUM); |
| 541 | else |
| 542 | return get_frame_extra_info (frame)->from_pc; |
| 543 | } |
| 544 | |
| 545 | static void |
| 546 | h8300_init_extra_frame_info (int fromleaf, struct frame_info *fi) |
| 547 | { |
| 548 | if (!get_frame_extra_info (fi)) |
| 549 | { |
| 550 | frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info)); |
| 551 | get_frame_extra_info (fi)->from_pc = 0; |
| 552 | |
| 553 | if (!get_frame_pc (fi)) |
| 554 | { |
| 555 | if (get_next_frame (fi)) |
| 556 | deprecated_update_frame_pc_hack (fi, h8300_frame_saved_pc (get_next_frame (fi))); |
| 557 | } |
| 558 | h8300_frame_init_saved_regs (fi); |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | /* Function: push_dummy_call |
| 563 | Setup the function arguments for calling a function in the inferior. |
| 564 | In this discussion, a `word' is 16 bits on the H8/300s, and 32 bits |
| 565 | on the H8/300H. |
| 566 | |
| 567 | There are actually two ABI's here: -mquickcall (the default) and |
| 568 | -mno-quickcall. With -mno-quickcall, all arguments are passed on |
| 569 | the stack after the return address, word-aligned. With |
| 570 | -mquickcall, GCC tries to use r0 -- r2 to pass registers. Since |
| 571 | GCC doesn't indicate in the object file which ABI was used to |
| 572 | compile it, GDB only supports the default --- -mquickcall. |
| 573 | |
| 574 | Here are the rules for -mquickcall, in detail: |
| 575 | |
| 576 | Each argument, whether scalar or aggregate, is padded to occupy a |
| 577 | whole number of words. Arguments smaller than a word are padded at |
| 578 | the most significant end; those larger than a word are padded at |
| 579 | the least significant end. |
| 580 | |
| 581 | The initial arguments are passed in r0 -- r2. Earlier arguments go in |
| 582 | lower-numbered registers. Multi-word arguments are passed in |
| 583 | consecutive registers, with the most significant end in the |
| 584 | lower-numbered register. |
| 585 | |
| 586 | If an argument doesn't fit entirely in the remaining registers, it |
| 587 | is passed entirely on the stack. Stack arguments begin just after |
| 588 | the return address. Once an argument has overflowed onto the stack |
| 589 | this way, all subsequent arguments are passed on the stack. |
| 590 | |
| 591 | The above rule has odd consequences. For example, on the h8/300s, |
| 592 | if a function takes two longs and an int as arguments: |
| 593 | - the first long will be passed in r0/r1, |
| 594 | - the second long will be passed entirely on the stack, since it |
| 595 | doesn't fit in r2, |
| 596 | - and the int will be passed on the stack, even though it could fit |
| 597 | in r2. |
| 598 | |
| 599 | A weird exception: if an argument is larger than a word, but not a |
| 600 | whole number of words in length (before padding), it is passed on |
| 601 | the stack following the rules for stack arguments above, even if |
| 602 | there are sufficient registers available to hold it. Stranger |
| 603 | still, the argument registers are still `used up' --- even though |
| 604 | there's nothing in them. |
| 605 | |
| 606 | So, for example, on the h8/300s, if a function expects a three-byte |
| 607 | structure and an int, the structure will go on the stack, and the |
| 608 | int will go in r2, not r0. |
| 609 | |
| 610 | If the function returns an aggregate type (struct, union, or class) |
| 611 | by value, the caller must allocate space to hold the return value, |
| 612 | and pass the callee a pointer to this space as an invisible first |
| 613 | argument, in R0. |
| 614 | |
| 615 | For varargs functions, the last fixed argument and all the variable |
| 616 | arguments are always passed on the stack. This means that calls to |
| 617 | varargs functions don't work properly unless there is a prototype |
| 618 | in scope. |
| 619 | |
| 620 | Basically, this ABI is not good, for the following reasons: |
| 621 | - You can't call vararg functions properly unless a prototype is in scope. |
| 622 | - Structure passing is inconsistent, to no purpose I can see. |
| 623 | - It often wastes argument registers, of which there are only three |
| 624 | to begin with. */ |
| 625 | |
| 626 | static CORE_ADDR |
| 627 | h8300_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr, |
| 628 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
| 629 | struct value **args, CORE_ADDR sp, int struct_return, |
| 630 | CORE_ADDR struct_addr) |
| 631 | { |
| 632 | int stack_alloc = 0, stack_offset = 0; |
| 633 | int wordsize = BINWORD; |
| 634 | int reg = E_ARG0_REGNUM; |
| 635 | int argument; |
| 636 | |
| 637 | /* First, make sure the stack is properly aligned. */ |
| 638 | sp = align_down (sp, wordsize); |
| 639 | |
| 640 | /* Now make sure there's space on the stack for the arguments. We |
| 641 | may over-allocate a little here, but that won't hurt anything. */ |
| 642 | for (argument = 0; argument < nargs; argument++) |
| 643 | stack_alloc += align_up (TYPE_LENGTH (VALUE_TYPE (args[argument])), |
| 644 | wordsize); |
| 645 | sp -= stack_alloc; |
| 646 | |
| 647 | /* Now load as many arguments as possible into registers, and push |
| 648 | the rest onto the stack. |
| 649 | If we're returning a structure by value, then we must pass a |
| 650 | pointer to the buffer for the return value as an invisible first |
| 651 | argument. */ |
| 652 | if (struct_return) |
| 653 | regcache_cooked_write_unsigned (regcache, reg++, struct_addr); |
| 654 | |
| 655 | for (argument = 0; argument < nargs; argument++) |
| 656 | { |
| 657 | struct type *type = VALUE_TYPE (args[argument]); |
| 658 | int len = TYPE_LENGTH (type); |
| 659 | char *contents = (char *) VALUE_CONTENTS (args[argument]); |
| 660 | |
| 661 | /* Pad the argument appropriately. */ |
| 662 | int padded_len = align_up (len, wordsize); |
| 663 | char *padded = alloca (padded_len); |
| 664 | |
| 665 | memset (padded, 0, padded_len); |
| 666 | memcpy (len < wordsize ? padded + padded_len - len : padded, |
| 667 | contents, len); |
| 668 | |
| 669 | /* Could the argument fit in the remaining registers? */ |
| 670 | if (padded_len <= (E_ARGLAST_REGNUM - reg + 1) * wordsize) |
| 671 | { |
| 672 | /* Are we going to pass it on the stack anyway, for no good |
| 673 | reason? */ |
| 674 | if (len > wordsize && len % wordsize) |
| 675 | { |
| 676 | /* I feel so unclean. */ |
| 677 | write_memory (sp + stack_offset, padded, padded_len); |
| 678 | stack_offset += padded_len; |
| 679 | |
| 680 | /* That's right --- even though we passed the argument |
| 681 | on the stack, we consume the registers anyway! Love |
| 682 | me, love my dog. */ |
| 683 | reg += padded_len / wordsize; |
| 684 | } |
| 685 | else |
| 686 | { |
| 687 | /* Heavens to Betsy --- it's really going in registers! |
| 688 | It would be nice if we could use write_register_bytes |
| 689 | here, but on the h8/300s, there are gaps between |
| 690 | the registers in the register file. */ |
| 691 | int offset; |
| 692 | |
| 693 | for (offset = 0; offset < padded_len; offset += wordsize) |
| 694 | { |
| 695 | ULONGEST word = extract_unsigned_integer (padded + offset, |
| 696 | wordsize); |
| 697 | regcache_cooked_write_unsigned (regcache, reg++, word); |
| 698 | } |
| 699 | } |
| 700 | } |
| 701 | else |
| 702 | { |
| 703 | /* It doesn't fit in registers! Onto the stack it goes. */ |
| 704 | write_memory (sp + stack_offset, padded, padded_len); |
| 705 | stack_offset += padded_len; |
| 706 | |
| 707 | /* Once one argument has spilled onto the stack, all |
| 708 | subsequent arguments go on the stack. */ |
| 709 | reg = E_ARGLAST_REGNUM + 1; |
| 710 | } |
| 711 | } |
| 712 | |
| 713 | /* Store return address. */ |
| 714 | sp -= wordsize; |
| 715 | write_memory_unsigned_integer (sp, wordsize, bp_addr); |
| 716 | |
| 717 | /* Update stack pointer. */ |
| 718 | regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, sp); |
| 719 | |
| 720 | return sp; |
| 721 | } |
| 722 | |
| 723 | /* Function: h8300_pop_frame |
| 724 | Restore the machine to the state it had before the current frame |
| 725 | was created. Usually used either by the "RETURN" command, or by |
| 726 | call_function_by_hand after the dummy_frame is finished. */ |
| 727 | |
| 728 | static void |
| 729 | h8300_pop_frame (void) |
| 730 | { |
| 731 | unsigned regno; |
| 732 | struct frame_info *frame = get_current_frame (); |
| 733 | |
| 734 | if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame), |
| 735 | get_frame_base (frame), |
| 736 | get_frame_base (frame))) |
| 737 | { |
| 738 | generic_pop_dummy_frame (); |
| 739 | } |
| 740 | else |
| 741 | { |
| 742 | for (regno = 0; regno < 8; regno++) |
| 743 | { |
| 744 | /* Don't forget E_SP_REGNUM is a frame_saved_regs struct is the |
| 745 | actual value we want, not the address of the value we want. */ |
| 746 | if (deprecated_get_frame_saved_regs (frame)[regno] && regno != E_SP_REGNUM) |
| 747 | write_register (regno, |
| 748 | read_memory_integer |
| 749 | (deprecated_get_frame_saved_regs (frame)[regno], BINWORD)); |
| 750 | else if (deprecated_get_frame_saved_regs (frame)[regno] && regno == E_SP_REGNUM) |
| 751 | write_register (regno, get_frame_base (frame) + 2 * BINWORD); |
| 752 | } |
| 753 | |
| 754 | /* Don't forget to update the PC too! */ |
| 755 | write_register (E_PC_REGNUM, get_frame_extra_info (frame)->from_pc); |
| 756 | } |
| 757 | flush_cached_frames (); |
| 758 | } |
| 759 | |
| 760 | /* Function: extract_return_value |
| 761 | Figure out where in REGBUF the called function has left its return value. |
| 762 | Copy that into VALBUF. Be sure to account for CPU type. */ |
| 763 | |
| 764 | static void |
| 765 | h8300_extract_return_value (struct type *type, struct regcache *regcache, |
| 766 | void *valbuf) |
| 767 | { |
| 768 | int len = TYPE_LENGTH (type); |
| 769 | ULONGEST c, addr; |
| 770 | |
| 771 | switch (len) |
| 772 | { |
| 773 | case 1: |
| 774 | case 2: |
| 775 | regcache_cooked_read_unsigned (regcache, E_RET0_REGNUM, &c); |
| 776 | store_unsigned_integer (valbuf, len, c); |
| 777 | break; |
| 778 | case 4: /* Needs two registers on plain H8/300 */ |
| 779 | regcache_cooked_read_unsigned (regcache, E_RET0_REGNUM, &c); |
| 780 | store_unsigned_integer (valbuf, 2, c); |
| 781 | regcache_cooked_read_unsigned (regcache, E_RET1_REGNUM, &c); |
| 782 | store_unsigned_integer ((void*)((char *)valbuf + 2), 2, c); |
| 783 | break; |
| 784 | case 8: /* long long is now 8 bytes. */ |
| 785 | if (TYPE_CODE (type) == TYPE_CODE_INT) |
| 786 | { |
| 787 | regcache_cooked_read_unsigned (regcache, E_RET0_REGNUM, &addr); |
| 788 | c = read_memory_unsigned_integer ((CORE_ADDR) addr, len); |
| 789 | store_unsigned_integer (valbuf, len, c); |
| 790 | } |
| 791 | else |
| 792 | { |
| 793 | error ("I don't know how this 8 byte value is returned."); |
| 794 | } |
| 795 | break; |
| 796 | } |
| 797 | } |
| 798 | |
| 799 | static void |
| 800 | h8300h_extract_return_value (struct type *type, struct regcache *regcache, |
| 801 | void *valbuf) |
| 802 | { |
| 803 | int len = TYPE_LENGTH (type); |
| 804 | ULONGEST c, addr; |
| 805 | |
| 806 | switch (len) |
| 807 | { |
| 808 | case 1: |
| 809 | case 2: |
| 810 | case 4: |
| 811 | regcache_cooked_read_unsigned (regcache, E_RET0_REGNUM, &c); |
| 812 | store_unsigned_integer (valbuf, len, c); |
| 813 | break; |
| 814 | case 8: /* long long is now 8 bytes. */ |
| 815 | if (TYPE_CODE (type) == TYPE_CODE_INT) |
| 816 | { |
| 817 | regcache_cooked_read_unsigned (regcache, E_RET0_REGNUM, &addr); |
| 818 | c = read_memory_unsigned_integer ((CORE_ADDR) addr, len); |
| 819 | store_unsigned_integer (valbuf, len, c); |
| 820 | } |
| 821 | else |
| 822 | { |
| 823 | error ("I don't know how this 8 byte value is returned."); |
| 824 | } |
| 825 | break; |
| 826 | } |
| 827 | } |
| 828 | |
| 829 | |
| 830 | /* Function: store_return_value |
| 831 | Place the appropriate value in the appropriate registers. |
| 832 | Primarily used by the RETURN command. */ |
| 833 | |
| 834 | static void |
| 835 | h8300_store_return_value (struct type *type, struct regcache *regcache, |
| 836 | const void *valbuf) |
| 837 | { |
| 838 | int len = TYPE_LENGTH (type); |
| 839 | ULONGEST val; |
| 840 | |
| 841 | switch (len) |
| 842 | { |
| 843 | case 1: |
| 844 | case 2: /* short... */ |
| 845 | val = extract_unsigned_integer (valbuf, len); |
| 846 | regcache_cooked_write_unsigned (regcache, E_RET0_REGNUM, val); |
| 847 | break; |
| 848 | case 4: /* long, float */ |
| 849 | val = extract_unsigned_integer (valbuf, len); |
| 850 | regcache_cooked_write_unsigned (regcache, E_RET0_REGNUM, |
| 851 | (val >> 16) &0xffff); |
| 852 | regcache_cooked_write_unsigned (regcache, E_RET1_REGNUM, val & 0xffff); |
| 853 | break; |
| 854 | case 8: /* long long, double and long double are all defined |
| 855 | as 4 byte types so far so this shouldn't happen. */ |
| 856 | error ("I don't know how to return an 8 byte value."); |
| 857 | break; |
| 858 | } |
| 859 | } |
| 860 | |
| 861 | static void |
| 862 | h8300h_store_return_value (struct type *type, struct regcache *regcache, |
| 863 | const void *valbuf) |
| 864 | { |
| 865 | int len = TYPE_LENGTH (type); |
| 866 | ULONGEST val; |
| 867 | |
| 868 | switch (len) |
| 869 | { |
| 870 | case 1: |
| 871 | case 2: |
| 872 | case 4: /* long, float */ |
| 873 | val = extract_unsigned_integer (valbuf, len); |
| 874 | regcache_cooked_write_unsigned (regcache, E_RET0_REGNUM, val); |
| 875 | break; |
| 876 | case 8: /* long long, double and long double are all defined |
| 877 | as 4 byte types so far so this shouldn't happen. */ |
| 878 | error ("I don't know how to return an 8 byte value."); |
| 879 | break; |
| 880 | } |
| 881 | } |
| 882 | |
| 883 | static struct cmd_list_element *setmachinelist; |
| 884 | |
| 885 | static const char * |
| 886 | h8300_register_name (int regno) |
| 887 | { |
| 888 | /* The register names change depending on which h8300 processor |
| 889 | type is selected. */ |
| 890 | static char *register_names[] = { |
| 891 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", |
| 892 | "sp", "","pc","cycles", "tick", "inst", |
| 893 | "ccr", /* pseudo register */ |
| 894 | }; |
| 895 | if (regno < 0 |
| 896 | || regno >= (sizeof (register_names) / sizeof (*register_names))) |
| 897 | internal_error (__FILE__, __LINE__, |
| 898 | "h8300_register_name: illegal register number %d", regno); |
| 899 | else |
| 900 | return register_names[regno]; |
| 901 | } |
| 902 | |
| 903 | static const char * |
| 904 | h8300s_register_name (int regno) |
| 905 | { |
| 906 | static char *register_names[] = { |
| 907 | "er0", "er1", "er2", "er3", "er4", "er5", "er6", |
| 908 | "sp", "", "pc", "cycles", "", "tick", "inst", |
| 909 | "mach", "macl", |
| 910 | "ccr", "exr" /* pseudo registers */ |
| 911 | }; |
| 912 | if (regno < 0 |
| 913 | || regno >= (sizeof (register_names) / sizeof (*register_names))) |
| 914 | internal_error (__FILE__, __LINE__, |
| 915 | "h8300s_register_name: illegal register number %d", regno); |
| 916 | else |
| 917 | return register_names[regno]; |
| 918 | } |
| 919 | |
| 920 | static const char * |
| 921 | h8300sx_register_name (int regno) |
| 922 | { |
| 923 | static char *register_names[] = { |
| 924 | "er0", "er1", "er2", "er3", "er4", "er5", "er6", |
| 925 | "sp", "", "pc", "cycles", "", "tick", "inst", |
| 926 | "mach", "macl", "sbr", "vbr", |
| 927 | "ccr", "exr" /* pseudo registers */ |
| 928 | }; |
| 929 | if (regno < 0 |
| 930 | || regno >= (sizeof (register_names) / sizeof (*register_names))) |
| 931 | internal_error (__FILE__, __LINE__, |
| 932 | "h8300sx_register_name: illegal register number %d", regno); |
| 933 | else |
| 934 | return register_names[regno]; |
| 935 | } |
| 936 | |
| 937 | static void |
| 938 | h8300_print_register (struct gdbarch *gdbarch, struct ui_file *file, |
| 939 | struct frame_info *frame, int regno) |
| 940 | { |
| 941 | LONGEST rval; |
| 942 | const char *name = gdbarch_register_name (gdbarch, regno); |
| 943 | |
| 944 | if (!name || !*name) |
| 945 | return; |
| 946 | |
| 947 | rval = get_frame_register_signed (frame, regno); |
| 948 | |
| 949 | fprintf_filtered (file, "%-14s ", name); |
| 950 | if (regno == E_PSEUDO_CCR_REGNUM || (regno == E_PSEUDO_EXR_REGNUM && h8300smode)) |
| 951 | { |
| 952 | fprintf_filtered (file, "0x%02x ", (unsigned char)rval); |
| 953 | print_longest (file, 'u', 1, rval); |
| 954 | } |
| 955 | else |
| 956 | { |
| 957 | fprintf_filtered (file, "0x%s ", phex ((ULONGEST)rval, BINWORD)); |
| 958 | print_longest (file, 'd', 1, rval); |
| 959 | } |
| 960 | if (regno == E_PSEUDO_CCR_REGNUM) |
| 961 | { |
| 962 | /* CCR register */ |
| 963 | int C, Z, N, V; |
| 964 | unsigned char l = rval & 0xff; |
| 965 | fprintf_filtered (file, "\t"); |
| 966 | fprintf_filtered (file, "I-%d ", (l & 0x80) != 0); |
| 967 | fprintf_filtered (file, "UI-%d ", (l & 0x40) != 0); |
| 968 | fprintf_filtered (file, "H-%d ", (l & 0x20) != 0); |
| 969 | fprintf_filtered (file, "U-%d ", (l & 0x10) != 0); |
| 970 | N = (l & 0x8) != 0; |
| 971 | Z = (l & 0x4) != 0; |
| 972 | V = (l & 0x2) != 0; |
| 973 | C = (l & 0x1) != 0; |
| 974 | fprintf_filtered (file, "N-%d ", N); |
| 975 | fprintf_filtered (file, "Z-%d ", Z); |
| 976 | fprintf_filtered (file, "V-%d ", V); |
| 977 | fprintf_filtered (file, "C-%d ", C); |
| 978 | if ((C | Z) == 0) |
| 979 | fprintf_filtered (file, "u> "); |
| 980 | if ((C | Z) == 1) |
| 981 | fprintf_filtered (file, "u<= "); |
| 982 | if ((C == 0)) |
| 983 | fprintf_filtered (file, "u>= "); |
| 984 | if (C == 1) |
| 985 | fprintf_filtered (file, "u< "); |
| 986 | if (Z == 0) |
| 987 | fprintf_filtered (file, "!= "); |
| 988 | if (Z == 1) |
| 989 | fprintf_filtered (file, "== "); |
| 990 | if ((N ^ V) == 0) |
| 991 | fprintf_filtered (file, ">= "); |
| 992 | if ((N ^ V) == 1) |
| 993 | fprintf_filtered (file, "< "); |
| 994 | if ((Z | (N ^ V)) == 0) |
| 995 | fprintf_filtered (file, "> "); |
| 996 | if ((Z | (N ^ V)) == 1) |
| 997 | fprintf_filtered (file, "<= "); |
| 998 | } |
| 999 | else if (regno == E_PSEUDO_EXR_REGNUM && h8300smode) |
| 1000 | { |
| 1001 | /* EXR register */ |
| 1002 | unsigned char l = rval & 0xff; |
| 1003 | fprintf_filtered (file, "\t"); |
| 1004 | fprintf_filtered (file, "T-%d - - - ", (l & 0x80) != 0); |
| 1005 | fprintf_filtered (file, "I2-%d ", (l & 4) != 0); |
| 1006 | fprintf_filtered (file, "I1-%d ", (l & 2) != 0); |
| 1007 | fprintf_filtered (file, "I0-%d", (l & 1) != 0); |
| 1008 | } |
| 1009 | fprintf_filtered (file, "\n"); |
| 1010 | } |
| 1011 | |
| 1012 | static void |
| 1013 | h8300_print_registers_info (struct gdbarch *gdbarch, struct ui_file *file, |
| 1014 | struct frame_info *frame, int regno, int cpregs) |
| 1015 | { |
| 1016 | if (regno < 0) |
| 1017 | { |
| 1018 | for (regno = E_R0_REGNUM; regno <= E_SP_REGNUM; ++regno) |
| 1019 | h8300_print_register (gdbarch, file, frame, regno); |
| 1020 | h8300_print_register (gdbarch, file, frame, E_PSEUDO_CCR_REGNUM); |
| 1021 | h8300_print_register (gdbarch, file, frame, E_PC_REGNUM); |
| 1022 | if (h8300smode) |
| 1023 | { |
| 1024 | h8300_print_register (gdbarch, file, frame, E_PSEUDO_EXR_REGNUM); |
| 1025 | if (h8300sxmode) |
| 1026 | { |
| 1027 | h8300_print_register (gdbarch, file, frame, E_SBR_REGNUM); |
| 1028 | h8300_print_register (gdbarch, file, frame, E_VBR_REGNUM); |
| 1029 | } |
| 1030 | h8300_print_register (gdbarch, file, frame, E_MACH_REGNUM); |
| 1031 | h8300_print_register (gdbarch, file, frame, E_MACL_REGNUM); |
| 1032 | h8300_print_register (gdbarch, file, frame, E_CYCLES_REGNUM); |
| 1033 | h8300_print_register (gdbarch, file, frame, E_TICKS_REGNUM); |
| 1034 | h8300_print_register (gdbarch, file, frame, E_INSTS_REGNUM); |
| 1035 | } |
| 1036 | else |
| 1037 | { |
| 1038 | h8300_print_register (gdbarch, file, frame, E_CYCLES_REGNUM); |
| 1039 | h8300_print_register (gdbarch, file, frame, E_TICK_REGNUM); |
| 1040 | h8300_print_register (gdbarch, file, frame, E_INST_REGNUM); |
| 1041 | } |
| 1042 | } |
| 1043 | else |
| 1044 | { |
| 1045 | if (regno == E_CCR_REGNUM) |
| 1046 | h8300_print_register (gdbarch, file, frame, E_PSEUDO_CCR_REGNUM); |
| 1047 | else if (regno == E_PSEUDO_EXR_REGNUM && h8300smode) |
| 1048 | h8300_print_register (gdbarch, file, frame, E_PSEUDO_EXR_REGNUM); |
| 1049 | else |
| 1050 | h8300_print_register (gdbarch, file, frame, regno); |
| 1051 | } |
| 1052 | } |
| 1053 | |
| 1054 | static CORE_ADDR |
| 1055 | h8300_saved_pc_after_call (struct frame_info *ignore) |
| 1056 | { |
| 1057 | return read_memory_unsigned_integer (read_register (E_SP_REGNUM), BINWORD); |
| 1058 | } |
| 1059 | |
| 1060 | static struct type * |
| 1061 | h8300_register_type (struct gdbarch *gdbarch, int regno) |
| 1062 | { |
| 1063 | if (regno < 0 || regno >= NUM_REGS + NUM_PSEUDO_REGS) |
| 1064 | internal_error (__FILE__, __LINE__, |
| 1065 | "h8300_register_type: illegal register number %d", |
| 1066 | regno); |
| 1067 | else |
| 1068 | { |
| 1069 | switch (regno) |
| 1070 | { |
| 1071 | case E_PC_REGNUM: |
| 1072 | return builtin_type_void_func_ptr; |
| 1073 | case E_SP_REGNUM: |
| 1074 | case E_FP_REGNUM: |
| 1075 | return builtin_type_void_data_ptr; |
| 1076 | default: |
| 1077 | if (regno == E_PSEUDO_CCR_REGNUM) |
| 1078 | return builtin_type_uint8; |
| 1079 | else if (regno == E_PSEUDO_EXR_REGNUM) |
| 1080 | return builtin_type_uint8; |
| 1081 | else if (h8300hmode) |
| 1082 | return builtin_type_int32; |
| 1083 | else |
| 1084 | return builtin_type_int16; |
| 1085 | } |
| 1086 | } |
| 1087 | } |
| 1088 | |
| 1089 | static void |
| 1090 | h8300_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache, |
| 1091 | int regno, void *buf) |
| 1092 | { |
| 1093 | if (regno == E_PSEUDO_CCR_REGNUM) |
| 1094 | regcache_raw_read (regcache, E_CCR_REGNUM, buf); |
| 1095 | else if (regno == E_PSEUDO_EXR_REGNUM) |
| 1096 | regcache_raw_read (regcache, E_EXR_REGNUM, buf); |
| 1097 | else |
| 1098 | regcache_raw_read (regcache, regno, buf); |
| 1099 | } |
| 1100 | |
| 1101 | static void |
| 1102 | h8300_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache, |
| 1103 | int regno, const void *buf) |
| 1104 | { |
| 1105 | if (regno == E_PSEUDO_CCR_REGNUM) |
| 1106 | regcache_raw_write (regcache, E_CCR_REGNUM, buf); |
| 1107 | else if (regno == E_PSEUDO_EXR_REGNUM) |
| 1108 | regcache_raw_write (regcache, E_EXR_REGNUM, buf); |
| 1109 | else |
| 1110 | regcache_raw_write (regcache, regno, buf); |
| 1111 | } |
| 1112 | |
| 1113 | static int |
| 1114 | h8300_dbg_reg_to_regnum (int regno) |
| 1115 | { |
| 1116 | if (regno == E_CCR_REGNUM) |
| 1117 | return E_PSEUDO_CCR_REGNUM; |
| 1118 | return regno; |
| 1119 | } |
| 1120 | |
| 1121 | static int |
| 1122 | h8300s_dbg_reg_to_regnum (int regno) |
| 1123 | { |
| 1124 | if (regno == E_CCR_REGNUM) |
| 1125 | return E_PSEUDO_CCR_REGNUM; |
| 1126 | if (regno == E_EXR_REGNUM) |
| 1127 | return E_PSEUDO_EXR_REGNUM; |
| 1128 | return regno; |
| 1129 | } |
| 1130 | |
| 1131 | static CORE_ADDR |
| 1132 | h8300_extract_struct_value_address (struct regcache *regcache) |
| 1133 | { |
| 1134 | ULONGEST addr; |
| 1135 | regcache_cooked_read_unsigned (regcache, E_RET0_REGNUM, &addr); |
| 1136 | return addr; |
| 1137 | } |
| 1138 | |
| 1139 | const static unsigned char * |
| 1140 | h8300_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
| 1141 | { |
| 1142 | /*static unsigned char breakpoint[] = { 0x7A, 0xFF };*/ /* ??? */ |
| 1143 | static unsigned char breakpoint[] = { 0x01, 0x80 }; /* Sleep */ |
| 1144 | |
| 1145 | *lenptr = sizeof (breakpoint); |
| 1146 | return breakpoint; |
| 1147 | } |
| 1148 | |
| 1149 | static CORE_ADDR |
| 1150 | h8300_push_dummy_code (struct gdbarch *gdbarch, |
| 1151 | CORE_ADDR sp, CORE_ADDR funaddr, int using_gcc, |
| 1152 | struct value **args, int nargs, |
| 1153 | struct type *value_type, |
| 1154 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr) |
| 1155 | { |
| 1156 | /* Allocate space sufficient for a breakpoint. */ |
| 1157 | sp = (sp - 2) & ~1; |
| 1158 | /* Store the address of that breakpoint */ |
| 1159 | *bp_addr = sp; |
| 1160 | /* h8300 always starts the call at the callee's entry point. */ |
| 1161 | *real_pc = funaddr; |
| 1162 | return sp; |
| 1163 | } |
| 1164 | |
| 1165 | static void |
| 1166 | h8300_print_float_info (struct gdbarch *gdbarch, struct ui_file *file, |
| 1167 | struct frame_info *frame, const char *args) |
| 1168 | { |
| 1169 | fprintf_filtered (file, "\ |
| 1170 | No floating-point info available for this processor.\n"); |
| 1171 | } |
| 1172 | |
| 1173 | static struct gdbarch * |
| 1174 | h8300_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 1175 | { |
| 1176 | struct gdbarch_tdep *tdep = NULL; |
| 1177 | struct gdbarch *gdbarch; |
| 1178 | |
| 1179 | arches = gdbarch_list_lookup_by_info (arches, &info); |
| 1180 | if (arches != NULL) |
| 1181 | return arches->gdbarch; |
| 1182 | |
| 1183 | #if 0 |
| 1184 | tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep)); |
| 1185 | #endif |
| 1186 | |
| 1187 | if (info.bfd_arch_info->arch != bfd_arch_h8300) |
| 1188 | return NULL; |
| 1189 | |
| 1190 | gdbarch = gdbarch_alloc (&info, 0); |
| 1191 | |
| 1192 | switch (info.bfd_arch_info->mach) |
| 1193 | { |
| 1194 | case bfd_mach_h8300: |
| 1195 | h8300sxmode = 0; |
| 1196 | h8300smode = 0; |
| 1197 | h8300hmode = 0; |
| 1198 | set_gdbarch_num_regs (gdbarch, 13); |
| 1199 | set_gdbarch_num_pseudo_regs (gdbarch, 1); |
| 1200 | set_gdbarch_ecoff_reg_to_regnum (gdbarch, h8300_dbg_reg_to_regnum); |
| 1201 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, h8300_dbg_reg_to_regnum); |
| 1202 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, h8300_dbg_reg_to_regnum); |
| 1203 | set_gdbarch_stab_reg_to_regnum (gdbarch, h8300_dbg_reg_to_regnum); |
| 1204 | set_gdbarch_register_name (gdbarch, h8300_register_name); |
| 1205 | set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| 1206 | set_gdbarch_addr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| 1207 | set_gdbarch_extract_return_value (gdbarch, h8300_extract_return_value); |
| 1208 | set_gdbarch_store_return_value (gdbarch, h8300_store_return_value); |
| 1209 | set_gdbarch_print_insn (gdbarch, print_insn_h8300); |
| 1210 | break; |
| 1211 | case bfd_mach_h8300h: |
| 1212 | case bfd_mach_h8300hn: |
| 1213 | h8300sxmode = 0; |
| 1214 | h8300smode = 0; |
| 1215 | h8300hmode = 1; |
| 1216 | set_gdbarch_num_regs (gdbarch, 13); |
| 1217 | set_gdbarch_num_pseudo_regs (gdbarch, 1); |
| 1218 | set_gdbarch_ecoff_reg_to_regnum (gdbarch, h8300_dbg_reg_to_regnum); |
| 1219 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, h8300_dbg_reg_to_regnum); |
| 1220 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, h8300_dbg_reg_to_regnum); |
| 1221 | set_gdbarch_stab_reg_to_regnum (gdbarch, h8300_dbg_reg_to_regnum); |
| 1222 | set_gdbarch_register_name (gdbarch, h8300_register_name); |
| 1223 | if(info.bfd_arch_info->mach != bfd_mach_h8300hn) |
| 1224 | { |
| 1225 | h8300_normal_mode = 0; |
| 1226 | set_gdbarch_ptr_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1227 | set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1228 | } |
| 1229 | else |
| 1230 | { |
| 1231 | h8300_normal_mode = 1; |
| 1232 | set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| 1233 | set_gdbarch_addr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| 1234 | } |
| 1235 | set_gdbarch_extract_return_value (gdbarch, h8300h_extract_return_value); |
| 1236 | set_gdbarch_store_return_value (gdbarch, h8300h_store_return_value); |
| 1237 | set_gdbarch_print_insn (gdbarch, print_insn_h8300h); |
| 1238 | break; |
| 1239 | case bfd_mach_h8300s: |
| 1240 | case bfd_mach_h8300sn: |
| 1241 | h8300sxmode = 0; |
| 1242 | h8300smode = 1; |
| 1243 | h8300hmode = 1; |
| 1244 | set_gdbarch_num_regs (gdbarch, 16); |
| 1245 | set_gdbarch_num_pseudo_regs (gdbarch, 2); |
| 1246 | set_gdbarch_ecoff_reg_to_regnum (gdbarch, h8300s_dbg_reg_to_regnum); |
| 1247 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, h8300s_dbg_reg_to_regnum); |
| 1248 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, h8300s_dbg_reg_to_regnum); |
| 1249 | set_gdbarch_stab_reg_to_regnum (gdbarch, h8300s_dbg_reg_to_regnum); |
| 1250 | set_gdbarch_register_name (gdbarch, h8300s_register_name); |
| 1251 | if(info.bfd_arch_info->mach != bfd_mach_h8300sn) |
| 1252 | { |
| 1253 | h8300_normal_mode = 0; |
| 1254 | set_gdbarch_ptr_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1255 | set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1256 | } |
| 1257 | else |
| 1258 | { |
| 1259 | h8300_normal_mode = 1; |
| 1260 | set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| 1261 | set_gdbarch_addr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| 1262 | } |
| 1263 | set_gdbarch_extract_return_value (gdbarch, h8300h_extract_return_value); |
| 1264 | set_gdbarch_store_return_value (gdbarch, h8300h_store_return_value); |
| 1265 | set_gdbarch_print_insn (gdbarch, print_insn_h8300s); |
| 1266 | break; |
| 1267 | case bfd_mach_h8300sx: |
| 1268 | case bfd_mach_h8300sxn: |
| 1269 | h8300sxmode = 1; |
| 1270 | h8300smode = 1; |
| 1271 | h8300hmode = 1; |
| 1272 | set_gdbarch_num_regs (gdbarch, 18); |
| 1273 | set_gdbarch_num_pseudo_regs (gdbarch, 2); |
| 1274 | set_gdbarch_ecoff_reg_to_regnum (gdbarch, h8300s_dbg_reg_to_regnum); |
| 1275 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, h8300s_dbg_reg_to_regnum); |
| 1276 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, h8300s_dbg_reg_to_regnum); |
| 1277 | set_gdbarch_stab_reg_to_regnum (gdbarch, h8300s_dbg_reg_to_regnum); |
| 1278 | set_gdbarch_register_name (gdbarch, h8300sx_register_name); |
| 1279 | if(info.bfd_arch_info->mach != bfd_mach_h8300sxn) |
| 1280 | { |
| 1281 | h8300_normal_mode = 0; |
| 1282 | set_gdbarch_ptr_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1283 | set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1284 | } |
| 1285 | else |
| 1286 | { |
| 1287 | h8300_normal_mode = 1; |
| 1288 | set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| 1289 | set_gdbarch_addr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| 1290 | } |
| 1291 | set_gdbarch_extract_return_value (gdbarch, h8300h_extract_return_value); |
| 1292 | set_gdbarch_store_return_value (gdbarch, h8300h_store_return_value); |
| 1293 | set_gdbarch_print_insn (gdbarch, print_insn_h8300s); |
| 1294 | break; |
| 1295 | } |
| 1296 | |
| 1297 | set_gdbarch_pseudo_register_read (gdbarch, h8300_pseudo_register_read); |
| 1298 | set_gdbarch_pseudo_register_write (gdbarch, h8300_pseudo_register_write); |
| 1299 | |
| 1300 | /* NOTE: cagney/2002-12-06: This can be deleted when this arch is |
| 1301 | ready to unwind the PC first (see frame.c:get_prev_frame()). */ |
| 1302 | set_gdbarch_deprecated_init_frame_pc (gdbarch, deprecated_init_frame_pc_default); |
| 1303 | |
| 1304 | /* |
| 1305 | * Basic register fields and methods. |
| 1306 | */ |
| 1307 | |
| 1308 | set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM); |
| 1309 | set_gdbarch_deprecated_fp_regnum (gdbarch, E_FP_REGNUM); |
| 1310 | set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM); |
| 1311 | set_gdbarch_register_type (gdbarch, h8300_register_type); |
| 1312 | set_gdbarch_print_registers_info (gdbarch, h8300_print_registers_info); |
| 1313 | set_gdbarch_print_float_info (gdbarch, h8300_print_float_info); |
| 1314 | |
| 1315 | /* |
| 1316 | * Frame Info |
| 1317 | */ |
| 1318 | set_gdbarch_skip_prologue (gdbarch, h8300_skip_prologue); |
| 1319 | |
| 1320 | set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, |
| 1321 | h8300_frame_init_saved_regs); |
| 1322 | set_gdbarch_deprecated_init_extra_frame_info (gdbarch, |
| 1323 | h8300_init_extra_frame_info); |
| 1324 | set_gdbarch_deprecated_frame_chain (gdbarch, h8300_frame_chain); |
| 1325 | set_gdbarch_deprecated_saved_pc_after_call (gdbarch, |
| 1326 | h8300_saved_pc_after_call); |
| 1327 | set_gdbarch_deprecated_frame_saved_pc (gdbarch, h8300_frame_saved_pc); |
| 1328 | set_gdbarch_deprecated_pop_frame (gdbarch, h8300_pop_frame); |
| 1329 | |
| 1330 | /* |
| 1331 | * Miscelany |
| 1332 | */ |
| 1333 | /* Stack grows up. */ |
| 1334 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 1335 | /* PC stops zero byte after a trap instruction |
| 1336 | (which means: exactly on trap instruction). */ |
| 1337 | set_gdbarch_decr_pc_after_break (gdbarch, 0); |
| 1338 | /* This value is almost never non-zero... */ |
| 1339 | set_gdbarch_function_start_offset (gdbarch, 0); |
| 1340 | /* This value is almost never non-zero... */ |
| 1341 | set_gdbarch_frame_args_skip (gdbarch, 0); |
| 1342 | set_gdbarch_frameless_function_invocation (gdbarch, |
| 1343 | frameless_look_for_prologue); |
| 1344 | |
| 1345 | set_gdbarch_extract_struct_value_address (gdbarch, |
| 1346 | h8300_extract_struct_value_address); |
| 1347 | set_gdbarch_use_struct_convention (gdbarch, always_use_struct_convention); |
| 1348 | set_gdbarch_breakpoint_from_pc (gdbarch, h8300_breakpoint_from_pc); |
| 1349 | set_gdbarch_push_dummy_code (gdbarch, h8300_push_dummy_code); |
| 1350 | set_gdbarch_push_dummy_call (gdbarch, h8300_push_dummy_call); |
| 1351 | |
| 1352 | set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| 1353 | set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1354 | set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT); |
| 1355 | set_gdbarch_double_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1356 | set_gdbarch_long_double_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1357 | |
| 1358 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); |
| 1359 | |
| 1360 | /* Char is unsigned. */ |
| 1361 | set_gdbarch_char_signed (gdbarch, 0); |
| 1362 | |
| 1363 | return gdbarch; |
| 1364 | } |
| 1365 | |
| 1366 | extern initialize_file_ftype _initialize_h8300_tdep; /* -Wmissing-prototypes */ |
| 1367 | |
| 1368 | void |
| 1369 | _initialize_h8300_tdep (void) |
| 1370 | { |
| 1371 | register_gdbarch_init (bfd_arch_h8300, h8300_gdbarch_init); |
| 1372 | } |