| 1 | /* Target-dependent code for the NEC V850 for GDB, the GNU debugger. |
| 2 | Copyright 1996, 1998, 1999, 2000, 2001, 2002, 2003 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "frame.h" |
| 24 | #include "inferior.h" |
| 25 | #include "target.h" |
| 26 | #include "value.h" |
| 27 | #include "bfd.h" |
| 28 | #include "gdb_string.h" |
| 29 | #include "gdbcore.h" |
| 30 | #include "symfile.h" |
| 31 | #include "arch-utils.h" |
| 32 | #include "regcache.h" |
| 33 | #include "symtab.h" |
| 34 | |
| 35 | struct gdbarch_tdep |
| 36 | { |
| 37 | /* gdbarch target dependent data here. Currently unused for v850. */ |
| 38 | }; |
| 39 | |
| 40 | /* Extra info which is saved in each frame_info. */ |
| 41 | struct frame_extra_info |
| 42 | { |
| 43 | }; |
| 44 | |
| 45 | enum { |
| 46 | E_R0_REGNUM, |
| 47 | E_R1_REGNUM, |
| 48 | E_R2_REGNUM, E_SAVE1_START_REGNUM = E_R2_REGNUM, E_SAVE1_END_REGNUM = E_R2_REGNUM, |
| 49 | E_R3_REGNUM, E_SP_REGNUM = E_R3_REGNUM, |
| 50 | E_R4_REGNUM, |
| 51 | E_R5_REGNUM, |
| 52 | E_R6_REGNUM, E_ARG0_REGNUM = E_R6_REGNUM, |
| 53 | E_R7_REGNUM, |
| 54 | E_R8_REGNUM, |
| 55 | E_R9_REGNUM, E_ARGLAST_REGNUM = E_R9_REGNUM, |
| 56 | E_R10_REGNUM, E_V0_REGNUM = E_R10_REGNUM, |
| 57 | E_R11_REGNUM, E_V1_REGNUM = E_R11_REGNUM, |
| 58 | E_R12_REGNUM, |
| 59 | E_R13_REGNUM, |
| 60 | E_R14_REGNUM, |
| 61 | E_R15_REGNUM, |
| 62 | E_R16_REGNUM, |
| 63 | E_R17_REGNUM, |
| 64 | E_R18_REGNUM, |
| 65 | E_R19_REGNUM, |
| 66 | E_R20_REGNUM, E_SAVE2_START_REGNUM = E_R20_REGNUM, |
| 67 | E_R21_REGNUM, |
| 68 | E_R22_REGNUM, |
| 69 | E_R23_REGNUM, |
| 70 | E_R24_REGNUM, |
| 71 | E_R25_REGNUM, |
| 72 | E_R26_REGNUM, |
| 73 | E_R27_REGNUM, |
| 74 | E_R28_REGNUM, |
| 75 | E_R29_REGNUM, E_SAVE2_END_REGNUM = E_R29_REGNUM, E_FP_RAW_REGNUM = E_R29_REGNUM, |
| 76 | E_R30_REGNUM, E_EP_REGNUM = E_R30_REGNUM, |
| 77 | E_R31_REGNUM, E_SAVE3_START_REGNUM = E_R31_REGNUM, E_SAVE3_END_REGNUM = E_R31_REGNUM, E_RP_REGNUM = E_R31_REGNUM, |
| 78 | E_R32_REGNUM, E_SR0_REGNUM = E_R32_REGNUM, |
| 79 | E_R33_REGNUM, |
| 80 | E_R34_REGNUM, |
| 81 | E_R35_REGNUM, |
| 82 | E_R36_REGNUM, |
| 83 | E_R37_REGNUM, E_PS_REGNUM = E_R37_REGNUM, |
| 84 | E_R38_REGNUM, |
| 85 | E_R39_REGNUM, |
| 86 | E_R40_REGNUM, |
| 87 | E_R41_REGNUM, |
| 88 | E_R42_REGNUM, |
| 89 | E_R43_REGNUM, |
| 90 | E_R44_REGNUM, |
| 91 | E_R45_REGNUM, |
| 92 | E_R46_REGNUM, |
| 93 | E_R47_REGNUM, |
| 94 | E_R48_REGNUM, |
| 95 | E_R49_REGNUM, |
| 96 | E_R50_REGNUM, |
| 97 | E_R51_REGNUM, |
| 98 | E_R52_REGNUM, E_CTBP_REGNUM = E_R52_REGNUM, |
| 99 | E_R53_REGNUM, |
| 100 | E_R54_REGNUM, |
| 101 | E_R55_REGNUM, |
| 102 | E_R56_REGNUM, |
| 103 | E_R57_REGNUM, |
| 104 | E_R58_REGNUM, |
| 105 | E_R59_REGNUM, |
| 106 | E_R60_REGNUM, |
| 107 | E_R61_REGNUM, |
| 108 | E_R62_REGNUM, |
| 109 | E_R63_REGNUM, |
| 110 | E_R64_REGNUM, E_PC_REGNUM = E_R64_REGNUM, |
| 111 | E_R65_REGNUM, E_FP_REGNUM = E_R65_REGNUM, |
| 112 | E_NUM_REGS |
| 113 | }; |
| 114 | |
| 115 | enum |
| 116 | { |
| 117 | v850_reg_size = 4 |
| 118 | }; |
| 119 | |
| 120 | /* Size of all registers as a whole. */ |
| 121 | enum |
| 122 | { |
| 123 | E_ALL_REGS_SIZE = (E_NUM_REGS) * v850_reg_size |
| 124 | }; |
| 125 | |
| 126 | /* Size of return datatype which fits into all return registers. */ |
| 127 | enum |
| 128 | { |
| 129 | E_MAX_RETTYPE_SIZE_IN_REGS = 2 * v850_reg_size |
| 130 | }; |
| 131 | |
| 132 | static LONGEST call_dummy_nil[] = {0}; |
| 133 | |
| 134 | static char *v850_generic_reg_names[] = |
| 135 | { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| 136 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", |
| 137 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", |
| 138 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", |
| 139 | "eipc", "eipsw", "fepc", "fepsw", "ecr", "psw", "sr6", "sr7", |
| 140 | "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15", |
| 141 | "sr16", "sr17", "sr18", "sr19", "sr20", "sr21", "sr22", "sr23", |
| 142 | "sr24", "sr25", "sr26", "sr27", "sr28", "sr29", "sr30", "sr31", |
| 143 | "pc", "fp" |
| 144 | }; |
| 145 | |
| 146 | static char *v850e_reg_names[] = |
| 147 | { |
| 148 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| 149 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", |
| 150 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", |
| 151 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", |
| 152 | "eipc", "eipsw", "fepc", "fepsw", "ecr", "psw", "sr6", "sr7", |
| 153 | "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15", |
| 154 | "ctpc", "ctpsw", "dbpc", "dbpsw", "ctbp", "sr21", "sr22", "sr23", |
| 155 | "sr24", "sr25", "sr26", "sr27", "sr28", "sr29", "sr30", "sr31", |
| 156 | "pc", "fp" |
| 157 | }; |
| 158 | |
| 159 | char **v850_register_names = v850_generic_reg_names; |
| 160 | |
| 161 | struct |
| 162 | { |
| 163 | char **regnames; |
| 164 | int mach; |
| 165 | } |
| 166 | v850_processor_type_table[] = |
| 167 | { |
| 168 | { |
| 169 | v850_generic_reg_names, bfd_mach_v850 |
| 170 | } |
| 171 | , |
| 172 | { |
| 173 | v850e_reg_names, bfd_mach_v850e |
| 174 | } |
| 175 | , |
| 176 | { |
| 177 | NULL, 0 |
| 178 | } |
| 179 | }; |
| 180 | |
| 181 | /* Info gleaned from scanning a function's prologue. */ |
| 182 | |
| 183 | struct pifsr /* Info about one saved reg */ |
| 184 | { |
| 185 | int framereg; /* Frame reg (SP or FP) */ |
| 186 | int offset; /* Offset from framereg */ |
| 187 | int cur_frameoffset; /* Current frameoffset */ |
| 188 | int reg; /* Saved register number */ |
| 189 | }; |
| 190 | |
| 191 | struct prologue_info |
| 192 | { |
| 193 | int framereg; |
| 194 | int frameoffset; |
| 195 | int start_function; |
| 196 | struct pifsr *pifsrs; |
| 197 | }; |
| 198 | |
| 199 | static CORE_ADDR v850_scan_prologue (CORE_ADDR pc, struct prologue_info *fs); |
| 200 | |
| 201 | /* Function: v850_register_name |
| 202 | Returns the name of the v850/v850e register N. */ |
| 203 | |
| 204 | static const char * |
| 205 | v850_register_name (int regnum) |
| 206 | { |
| 207 | if (regnum < 0 || regnum >= E_NUM_REGS) |
| 208 | internal_error (__FILE__, __LINE__, |
| 209 | "v850_register_name: illegal register number %d", |
| 210 | regnum); |
| 211 | else |
| 212 | return v850_register_names[regnum]; |
| 213 | |
| 214 | } |
| 215 | |
| 216 | /* Function: v850_register_byte |
| 217 | Returns the byte position in the register cache for register N. */ |
| 218 | |
| 219 | static int |
| 220 | v850_register_byte (int regnum) |
| 221 | { |
| 222 | if (regnum < 0 || regnum >= E_NUM_REGS) |
| 223 | internal_error (__FILE__, __LINE__, |
| 224 | "v850_register_byte: illegal register number %d", |
| 225 | regnum); |
| 226 | else |
| 227 | return regnum * v850_reg_size; |
| 228 | } |
| 229 | |
| 230 | /* Function: v850_register_raw_size |
| 231 | Returns the number of bytes occupied by the register on the target. */ |
| 232 | |
| 233 | static int |
| 234 | v850_register_raw_size (int regnum) |
| 235 | { |
| 236 | if (regnum < 0 || regnum >= E_NUM_REGS) |
| 237 | internal_error (__FILE__, __LINE__, |
| 238 | "v850_register_raw_size: illegal register number %d", |
| 239 | regnum); |
| 240 | /* Only the PC has 4 Byte, all other registers 2 Byte. */ |
| 241 | else |
| 242 | return v850_reg_size; |
| 243 | } |
| 244 | |
| 245 | /* Function: v850_register_virtual_size |
| 246 | Returns the number of bytes occupied by the register as represented |
| 247 | internally by gdb. */ |
| 248 | |
| 249 | static int |
| 250 | v850_register_virtual_size (int regnum) |
| 251 | { |
| 252 | return v850_register_raw_size (regnum); |
| 253 | } |
| 254 | |
| 255 | /* Function: v850_reg_virtual_type |
| 256 | Returns the default type for register N. */ |
| 257 | |
| 258 | static struct type * |
| 259 | v850_reg_virtual_type (int regnum) |
| 260 | { |
| 261 | if (regnum < 0 || regnum >= E_NUM_REGS) |
| 262 | internal_error (__FILE__, __LINE__, |
| 263 | "v850_register_virtual_type: illegal register number %d", |
| 264 | regnum); |
| 265 | else if (regnum == E_PC_REGNUM) |
| 266 | return builtin_type_uint32; |
| 267 | else |
| 268 | return builtin_type_int32; |
| 269 | } |
| 270 | |
| 271 | static int |
| 272 | v850_type_is_scalar (struct type *t) |
| 273 | { |
| 274 | return (TYPE_CODE (t) != TYPE_CODE_STRUCT |
| 275 | && TYPE_CODE (t) != TYPE_CODE_UNION |
| 276 | && TYPE_CODE (t) != TYPE_CODE_ARRAY); |
| 277 | } |
| 278 | |
| 279 | /* Should call_function allocate stack space for a struct return? */ |
| 280 | static int |
| 281 | v850_use_struct_convention (int gcc_p, struct type *type) |
| 282 | { |
| 283 | /* According to ABI: |
| 284 | * return TYPE_LENGTH (type) > 8); |
| 285 | */ |
| 286 | |
| 287 | /* Current implementation in gcc: */ |
| 288 | |
| 289 | int i; |
| 290 | struct type *fld_type, *tgt_type; |
| 291 | |
| 292 | /* 1. The value is greater than 8 bytes -> returned by copying */ |
| 293 | if (TYPE_LENGTH (type) > 8) |
| 294 | return 1; |
| 295 | |
| 296 | /* 2. The value is a single basic type -> returned in register */ |
| 297 | if (v850_type_is_scalar (type)) |
| 298 | return 0; |
| 299 | |
| 300 | /* The value is a structure or union with a single element |
| 301 | * and that element is either a single basic type or an array of |
| 302 | * a single basic type whoes size is greater than or equal to 4 |
| 303 | * -> returned in register */ |
| 304 | if ((TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 305 | || TYPE_CODE (type) == TYPE_CODE_UNION) |
| 306 | && TYPE_NFIELDS (type) == 1) |
| 307 | { |
| 308 | fld_type = TYPE_FIELD_TYPE (type, 0); |
| 309 | if (v850_type_is_scalar (fld_type) && TYPE_LENGTH (fld_type) >= 4) |
| 310 | return 0; |
| 311 | |
| 312 | if (TYPE_CODE (fld_type) == TYPE_CODE_ARRAY) |
| 313 | { |
| 314 | tgt_type = TYPE_TARGET_TYPE (fld_type); |
| 315 | if (v850_type_is_scalar (tgt_type) && TYPE_LENGTH (tgt_type) >= 4) |
| 316 | return 0; |
| 317 | } |
| 318 | } |
| 319 | |
| 320 | /* The value is a structure whose first element is an integer or |
| 321 | * a float, and which contains no arrays of more than two elements |
| 322 | * -> returned in register */ |
| 323 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 324 | && v850_type_is_scalar (TYPE_FIELD_TYPE (type, 0)) |
| 325 | && TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0)) == 4) |
| 326 | { |
| 327 | for (i = 1; i < TYPE_NFIELDS (type); ++i) |
| 328 | { |
| 329 | fld_type = TYPE_FIELD_TYPE (type, 0); |
| 330 | if (TYPE_CODE (fld_type) == TYPE_CODE_ARRAY) |
| 331 | { |
| 332 | tgt_type = TYPE_TARGET_TYPE (fld_type); |
| 333 | if (TYPE_LENGTH (fld_type) >= 0 && TYPE_LENGTH (tgt_type) >= 0 |
| 334 | && TYPE_LENGTH (fld_type) / TYPE_LENGTH (tgt_type) > 2) |
| 335 | return 1; |
| 336 | } |
| 337 | } |
| 338 | return 0; |
| 339 | } |
| 340 | |
| 341 | /* The value is a union which contains at least one field which |
| 342 | * would be returned in registers according to these rules |
| 343 | * -> returned in register */ |
| 344 | if (TYPE_CODE (type) == TYPE_CODE_UNION) |
| 345 | { |
| 346 | for (i = 0; i < TYPE_NFIELDS (type); ++i) |
| 347 | { |
| 348 | fld_type = TYPE_FIELD_TYPE (type, 0); |
| 349 | if (!v850_use_struct_convention (0, fld_type)) |
| 350 | return 0; |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | return 1; |
| 355 | } |
| 356 | \f |
| 357 | |
| 358 | |
| 359 | /* Structure for mapping bits in register lists to register numbers. */ |
| 360 | struct reg_list |
| 361 | { |
| 362 | long mask; |
| 363 | int regno; |
| 364 | }; |
| 365 | |
| 366 | /* Helper function for v850_scan_prologue to handle prepare instruction. */ |
| 367 | |
| 368 | static void |
| 369 | handle_prepare (int insn, int insn2, CORE_ADDR * current_pc_ptr, |
| 370 | struct prologue_info *pi, struct pifsr **pifsr_ptr) |
| 371 | { |
| 372 | CORE_ADDR current_pc = *current_pc_ptr; |
| 373 | struct pifsr *pifsr = *pifsr_ptr; |
| 374 | long next = insn2 & 0xffff; |
| 375 | long list12 = ((insn & 1) << 16) + (next & 0xffe0); |
| 376 | long offset = (insn & 0x3e) << 1; |
| 377 | static struct reg_list reg_table[] = |
| 378 | { |
| 379 | {0x00800, 20}, /* r20 */ |
| 380 | {0x00400, 21}, /* r21 */ |
| 381 | {0x00200, 22}, /* r22 */ |
| 382 | {0x00100, 23}, /* r23 */ |
| 383 | {0x08000, 24}, /* r24 */ |
| 384 | {0x04000, 25}, /* r25 */ |
| 385 | {0x02000, 26}, /* r26 */ |
| 386 | {0x01000, 27}, /* r27 */ |
| 387 | {0x00080, 28}, /* r28 */ |
| 388 | {0x00040, 29}, /* r29 */ |
| 389 | {0x10000, 30}, /* ep */ |
| 390 | {0x00020, 31}, /* lp */ |
| 391 | {0, 0} /* end of table */ |
| 392 | }; |
| 393 | int i; |
| 394 | |
| 395 | if ((next & 0x1f) == 0x0b) /* skip imm16 argument */ |
| 396 | current_pc += 2; |
| 397 | else if ((next & 0x1f) == 0x13) /* skip imm16 argument */ |
| 398 | current_pc += 2; |
| 399 | else if ((next & 0x1f) == 0x1b) /* skip imm32 argument */ |
| 400 | current_pc += 4; |
| 401 | |
| 402 | /* Calculate the total size of the saved registers, and add it |
| 403 | it to the immediate value used to adjust SP. */ |
| 404 | for (i = 0; reg_table[i].mask != 0; i++) |
| 405 | if (list12 & reg_table[i].mask) |
| 406 | offset += v850_register_raw_size (reg_table[i].regno); |
| 407 | pi->frameoffset -= offset; |
| 408 | |
| 409 | /* Calculate the offsets of the registers relative to the value |
| 410 | the SP will have after the registers have been pushed and the |
| 411 | imm5 value has been subtracted from it. */ |
| 412 | if (pifsr) |
| 413 | { |
| 414 | for (i = 0; reg_table[i].mask != 0; i++) |
| 415 | { |
| 416 | if (list12 & reg_table[i].mask) |
| 417 | { |
| 418 | int reg = reg_table[i].regno; |
| 419 | offset -= v850_register_raw_size (reg); |
| 420 | pifsr->reg = reg; |
| 421 | pifsr->offset = offset; |
| 422 | pifsr->cur_frameoffset = pi->frameoffset; |
| 423 | #ifdef DEBUG |
| 424 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); |
| 425 | #endif |
| 426 | pifsr++; |
| 427 | } |
| 428 | } |
| 429 | } |
| 430 | #ifdef DEBUG |
| 431 | printf_filtered ("\tfound ctret after regsave func"); |
| 432 | #endif |
| 433 | |
| 434 | /* Set result parameters. */ |
| 435 | *current_pc_ptr = current_pc; |
| 436 | *pifsr_ptr = pifsr; |
| 437 | } |
| 438 | |
| 439 | |
| 440 | /* Helper function for v850_scan_prologue to handle pushm/pushl instructions. |
| 441 | FIXME: the SR bit of the register list is not supported; must check |
| 442 | that the compiler does not ever generate this bit. */ |
| 443 | |
| 444 | static void |
| 445 | handle_pushm (int insn, int insn2, struct prologue_info *pi, |
| 446 | struct pifsr **pifsr_ptr) |
| 447 | { |
| 448 | struct pifsr *pifsr = *pifsr_ptr; |
| 449 | long list12 = ((insn & 0x0f) << 16) + (insn2 & 0xfff0); |
| 450 | long offset = 0; |
| 451 | static struct reg_list pushml_reg_table[] = |
| 452 | { |
| 453 | {0x80000, E_PS_REGNUM}, /* PSW */ |
| 454 | {0x40000, 1}, /* r1 */ |
| 455 | {0x20000, 2}, /* r2 */ |
| 456 | {0x10000, 3}, /* r3 */ |
| 457 | {0x00800, 4}, /* r4 */ |
| 458 | {0x00400, 5}, /* r5 */ |
| 459 | {0x00200, 6}, /* r6 */ |
| 460 | {0x00100, 7}, /* r7 */ |
| 461 | {0x08000, 8}, /* r8 */ |
| 462 | {0x04000, 9}, /* r9 */ |
| 463 | {0x02000, 10}, /* r10 */ |
| 464 | {0x01000, 11}, /* r11 */ |
| 465 | {0x00080, 12}, /* r12 */ |
| 466 | {0x00040, 13}, /* r13 */ |
| 467 | {0x00020, 14}, /* r14 */ |
| 468 | {0x00010, 15}, /* r15 */ |
| 469 | {0, 0} /* end of table */ |
| 470 | }; |
| 471 | static struct reg_list pushmh_reg_table[] = |
| 472 | { |
| 473 | {0x80000, 16}, /* r16 */ |
| 474 | {0x40000, 17}, /* r17 */ |
| 475 | {0x20000, 18}, /* r18 */ |
| 476 | {0x10000, 19}, /* r19 */ |
| 477 | {0x00800, 20}, /* r20 */ |
| 478 | {0x00400, 21}, /* r21 */ |
| 479 | {0x00200, 22}, /* r22 */ |
| 480 | {0x00100, 23}, /* r23 */ |
| 481 | {0x08000, 24}, /* r24 */ |
| 482 | {0x04000, 25}, /* r25 */ |
| 483 | {0x02000, 26}, /* r26 */ |
| 484 | {0x01000, 27}, /* r27 */ |
| 485 | {0x00080, 28}, /* r28 */ |
| 486 | {0x00040, 29}, /* r29 */ |
| 487 | {0x00010, 30}, /* r30 */ |
| 488 | {0x00020, 31}, /* r31 */ |
| 489 | {0, 0} /* end of table */ |
| 490 | }; |
| 491 | struct reg_list *reg_table; |
| 492 | int i; |
| 493 | |
| 494 | /* Is this a pushml or a pushmh? */ |
| 495 | if ((insn2 & 7) == 1) |
| 496 | reg_table = pushml_reg_table; |
| 497 | else |
| 498 | reg_table = pushmh_reg_table; |
| 499 | |
| 500 | /* Calculate the total size of the saved registers, and add it |
| 501 | it to the immediate value used to adjust SP. */ |
| 502 | for (i = 0; reg_table[i].mask != 0; i++) |
| 503 | if (list12 & reg_table[i].mask) |
| 504 | offset += v850_register_raw_size (reg_table[i].regno); |
| 505 | pi->frameoffset -= offset; |
| 506 | |
| 507 | /* Calculate the offsets of the registers relative to the value |
| 508 | the SP will have after the registers have been pushed and the |
| 509 | imm5 value is subtracted from it. */ |
| 510 | if (pifsr) |
| 511 | { |
| 512 | for (i = 0; reg_table[i].mask != 0; i++) |
| 513 | { |
| 514 | if (list12 & reg_table[i].mask) |
| 515 | { |
| 516 | int reg = reg_table[i].regno; |
| 517 | offset -= v850_register_raw_size (reg); |
| 518 | pifsr->reg = reg; |
| 519 | pifsr->offset = offset; |
| 520 | pifsr->cur_frameoffset = pi->frameoffset; |
| 521 | #ifdef DEBUG |
| 522 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); |
| 523 | #endif |
| 524 | pifsr++; |
| 525 | } |
| 526 | } |
| 527 | } |
| 528 | #ifdef DEBUG |
| 529 | printf_filtered ("\tfound ctret after regsave func"); |
| 530 | #endif |
| 531 | |
| 532 | /* Set result parameters. */ |
| 533 | *pifsr_ptr = pifsr; |
| 534 | } |
| 535 | \f |
| 536 | |
| 537 | |
| 538 | |
| 539 | /* Function: scan_prologue |
| 540 | Scan the prologue of the function that contains PC, and record what |
| 541 | we find in PI. Returns the pc after the prologue. Note that the |
| 542 | addresses saved in frame->saved_regs are just frame relative (negative |
| 543 | offsets from the frame pointer). This is because we don't know the |
| 544 | actual value of the frame pointer yet. In some circumstances, the |
| 545 | frame pointer can't be determined till after we have scanned the |
| 546 | prologue. */ |
| 547 | |
| 548 | static CORE_ADDR |
| 549 | v850_scan_prologue (CORE_ADDR pc, struct prologue_info *pi) |
| 550 | { |
| 551 | CORE_ADDR func_addr, prologue_end, current_pc; |
| 552 | struct pifsr *pifsr, *pifsr_tmp; |
| 553 | int fp_used; |
| 554 | int ep_used; |
| 555 | int reg; |
| 556 | CORE_ADDR save_pc, save_end; |
| 557 | int regsave_func_p; |
| 558 | int r12_tmp; |
| 559 | |
| 560 | /* First, figure out the bounds of the prologue so that we can limit the |
| 561 | search to something reasonable. */ |
| 562 | |
| 563 | if (find_pc_partial_function (pc, NULL, &func_addr, NULL)) |
| 564 | { |
| 565 | struct symtab_and_line sal; |
| 566 | |
| 567 | sal = find_pc_line (func_addr, 0); |
| 568 | |
| 569 | if (func_addr == entry_point_address ()) |
| 570 | pi->start_function = 1; |
| 571 | else |
| 572 | pi->start_function = 0; |
| 573 | |
| 574 | #if 0 |
| 575 | if (sal.line == 0) |
| 576 | prologue_end = pc; |
| 577 | else |
| 578 | prologue_end = sal.end; |
| 579 | #else |
| 580 | prologue_end = pc; |
| 581 | #endif |
| 582 | } |
| 583 | else |
| 584 | { /* We're in the boondocks */ |
| 585 | func_addr = pc - 100; |
| 586 | prologue_end = pc; |
| 587 | } |
| 588 | |
| 589 | prologue_end = min (prologue_end, pc); |
| 590 | |
| 591 | /* Now, search the prologue looking for instructions that setup fp, save |
| 592 | rp, adjust sp and such. We also record the frame offset of any saved |
| 593 | registers. */ |
| 594 | |
| 595 | pi->frameoffset = 0; |
| 596 | pi->framereg = E_SP_REGNUM; |
| 597 | fp_used = 0; |
| 598 | ep_used = 0; |
| 599 | pifsr = pi->pifsrs; |
| 600 | regsave_func_p = 0; |
| 601 | save_pc = 0; |
| 602 | save_end = 0; |
| 603 | r12_tmp = 0; |
| 604 | |
| 605 | #ifdef DEBUG |
| 606 | printf_filtered ("Current_pc = 0x%.8lx, prologue_end = 0x%.8lx\n", |
| 607 | (long) func_addr, (long) prologue_end); |
| 608 | #endif |
| 609 | |
| 610 | for (current_pc = func_addr; current_pc < prologue_end;) |
| 611 | { |
| 612 | int insn; |
| 613 | int insn2 = -1; /* dummy value */ |
| 614 | |
| 615 | #ifdef DEBUG |
| 616 | fprintf_filtered (gdb_stdlog, "0x%.8lx ", (long) current_pc); |
| 617 | gdb_print_insn (current_pc, gdb_stdlog); |
| 618 | #endif |
| 619 | |
| 620 | insn = read_memory_unsigned_integer (current_pc, 2); |
| 621 | current_pc += 2; |
| 622 | if ((insn & 0x0780) >= 0x0600) /* Four byte instruction? */ |
| 623 | { |
| 624 | insn2 = read_memory_unsigned_integer (current_pc, 2); |
| 625 | current_pc += 2; |
| 626 | } |
| 627 | |
| 628 | if ((insn & 0xffc0) == ((10 << 11) | 0x0780) && !regsave_func_p) |
| 629 | { /* jarl <func>,10 */ |
| 630 | long low_disp = insn2 & ~(long) 1; |
| 631 | long disp = (((((insn & 0x3f) << 16) + low_disp) |
| 632 | & ~(long) 1) ^ 0x00200000) - 0x00200000; |
| 633 | |
| 634 | save_pc = current_pc; |
| 635 | save_end = prologue_end; |
| 636 | regsave_func_p = 1; |
| 637 | current_pc += disp - 4; |
| 638 | prologue_end = (current_pc |
| 639 | + (2 * 3) /* moves to/from ep */ |
| 640 | + 4 /* addi <const>,sp,sp */ |
| 641 | + 2 /* jmp [r10] */ |
| 642 | + (2 * 12) /* sst.w to save r2, r20-r29, r31 */ |
| 643 | + 20); /* slop area */ |
| 644 | |
| 645 | #ifdef DEBUG |
| 646 | printf_filtered ("\tfound jarl <func>,r10, disp = %ld, low_disp = %ld, new pc = 0x%.8lx\n", |
| 647 | disp, low_disp, (long) current_pc + 2); |
| 648 | #endif |
| 649 | continue; |
| 650 | } |
| 651 | else if ((insn & 0xffc0) == 0x0200 && !regsave_func_p) |
| 652 | { /* callt <imm6> */ |
| 653 | long ctbp = read_register (E_CTBP_REGNUM); |
| 654 | long adr = ctbp + ((insn & 0x3f) << 1); |
| 655 | |
| 656 | save_pc = current_pc; |
| 657 | save_end = prologue_end; |
| 658 | regsave_func_p = 1; |
| 659 | current_pc = ctbp + (read_memory_unsigned_integer (adr, 2) & 0xffff); |
| 660 | prologue_end = (current_pc |
| 661 | + (2 * 3) /* prepare list2,imm5,sp/imm */ |
| 662 | + 4 /* ctret */ |
| 663 | + 20); /* slop area */ |
| 664 | |
| 665 | #ifdef DEBUG |
| 666 | printf_filtered ("\tfound callt, ctbp = 0x%.8lx, adr = %.8lx, new pc = 0x%.8lx\n", |
| 667 | ctbp, adr, (long) current_pc); |
| 668 | #endif |
| 669 | continue; |
| 670 | } |
| 671 | else if ((insn & 0xffc0) == 0x0780) /* prepare list2,imm5 */ |
| 672 | { |
| 673 | handle_prepare (insn, insn2, ¤t_pc, pi, &pifsr); |
| 674 | continue; |
| 675 | } |
| 676 | else if (insn == 0x07e0 && regsave_func_p && insn2 == 0x0144) |
| 677 | { /* ctret after processing register save function */ |
| 678 | current_pc = save_pc; |
| 679 | prologue_end = save_end; |
| 680 | regsave_func_p = 0; |
| 681 | #ifdef DEBUG |
| 682 | printf_filtered ("\tfound ctret after regsave func"); |
| 683 | #endif |
| 684 | continue; |
| 685 | } |
| 686 | else if ((insn & 0xfff0) == 0x07e0 && (insn2 & 5) == 1) |
| 687 | { /* pushml, pushmh */ |
| 688 | handle_pushm (insn, insn2, pi, &pifsr); |
| 689 | continue; |
| 690 | } |
| 691 | else if ((insn & 0xffe0) == 0x0060 && regsave_func_p) |
| 692 | { /* jmp after processing register save function */ |
| 693 | current_pc = save_pc; |
| 694 | prologue_end = save_end; |
| 695 | regsave_func_p = 0; |
| 696 | #ifdef DEBUG |
| 697 | printf_filtered ("\tfound jmp after regsave func"); |
| 698 | #endif |
| 699 | continue; |
| 700 | } |
| 701 | else if ((insn & 0x07c0) == 0x0780 /* jarl or jr */ |
| 702 | || (insn & 0xffe0) == 0x0060 /* jmp */ |
| 703 | || (insn & 0x0780) == 0x0580) /* branch */ |
| 704 | { |
| 705 | #ifdef DEBUG |
| 706 | printf_filtered ("\n"); |
| 707 | #endif |
| 708 | break; /* Ran into end of prologue */ |
| 709 | } |
| 710 | |
| 711 | else if ((insn & 0xffe0) == ((E_SP_REGNUM << 11) | 0x0240)) /* add <imm>,sp */ |
| 712 | pi->frameoffset += ((insn & 0x1f) ^ 0x10) - 0x10; |
| 713 | else if (insn == ((E_SP_REGNUM << 11) | 0x0600 | E_SP_REGNUM)) /* addi <imm>,sp,sp */ |
| 714 | pi->frameoffset += insn2; |
| 715 | else if (insn == ((E_FP_RAW_REGNUM << 11) | 0x0000 | E_SP_REGNUM)) /* mov sp,fp */ |
| 716 | { |
| 717 | fp_used = 1; |
| 718 | pi->framereg = E_FP_RAW_REGNUM; |
| 719 | } |
| 720 | |
| 721 | else if (insn == ((E_R12_REGNUM << 11) | 0x0640 | E_R0_REGNUM)) /* movhi hi(const),r0,r12 */ |
| 722 | r12_tmp = insn2 << 16; |
| 723 | else if (insn == ((E_R12_REGNUM << 11) | 0x0620 | E_R12_REGNUM)) /* movea lo(const),r12,r12 */ |
| 724 | r12_tmp += insn2; |
| 725 | else if (insn == ((E_SP_REGNUM << 11) | 0x01c0 | E_R12_REGNUM) && r12_tmp) /* add r12,sp */ |
| 726 | pi->frameoffset = r12_tmp; |
| 727 | else if (insn == ((E_EP_REGNUM << 11) | 0x0000 | E_SP_REGNUM)) /* mov sp,ep */ |
| 728 | ep_used = 1; |
| 729 | else if (insn == ((E_EP_REGNUM << 11) | 0x0000 | E_R1_REGNUM)) /* mov r1,ep */ |
| 730 | ep_used = 0; |
| 731 | else if (((insn & 0x07ff) == (0x0760 | E_SP_REGNUM) /* st.w <reg>,<offset>[sp] */ |
| 732 | || (fp_used |
| 733 | && (insn & 0x07ff) == (0x0760 | E_FP_RAW_REGNUM))) /* st.w <reg>,<offset>[fp] */ |
| 734 | && pifsr |
| 735 | && (((reg = (insn >> 11) & 0x1f) >= E_SAVE1_START_REGNUM && reg <= E_SAVE1_END_REGNUM) |
| 736 | || (reg >= E_SAVE2_START_REGNUM && reg <= E_SAVE2_END_REGNUM) |
| 737 | || (reg >= E_SAVE3_START_REGNUM && reg <= E_SAVE3_END_REGNUM))) |
| 738 | { |
| 739 | pifsr->reg = reg; |
| 740 | pifsr->offset = insn2 & ~1; |
| 741 | pifsr->cur_frameoffset = pi->frameoffset; |
| 742 | #ifdef DEBUG |
| 743 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); |
| 744 | #endif |
| 745 | pifsr++; |
| 746 | } |
| 747 | |
| 748 | else if (ep_used /* sst.w <reg>,<offset>[ep] */ |
| 749 | && ((insn & 0x0781) == 0x0501) |
| 750 | && pifsr |
| 751 | && (((reg = (insn >> 11) & 0x1f) >= E_SAVE1_START_REGNUM && reg <= E_SAVE1_END_REGNUM) |
| 752 | || (reg >= E_SAVE2_START_REGNUM && reg <= E_SAVE2_END_REGNUM) |
| 753 | || (reg >= E_SAVE3_START_REGNUM && reg <= E_SAVE3_END_REGNUM))) |
| 754 | { |
| 755 | pifsr->reg = reg; |
| 756 | pifsr->offset = (insn & 0x007e) << 1; |
| 757 | pifsr->cur_frameoffset = pi->frameoffset; |
| 758 | #ifdef DEBUG |
| 759 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); |
| 760 | #endif |
| 761 | pifsr++; |
| 762 | } |
| 763 | |
| 764 | #ifdef DEBUG |
| 765 | printf_filtered ("\n"); |
| 766 | #endif |
| 767 | } |
| 768 | |
| 769 | if (pifsr) |
| 770 | pifsr->framereg = 0; /* Tie off last entry */ |
| 771 | |
| 772 | /* Fix up any offsets to the final offset. If a frame pointer was created, use it |
| 773 | instead of the stack pointer. */ |
| 774 | for (pifsr_tmp = pi->pifsrs; pifsr_tmp && pifsr_tmp != pifsr; pifsr_tmp++) |
| 775 | { |
| 776 | pifsr_tmp->offset -= pi->frameoffset - pifsr_tmp->cur_frameoffset; |
| 777 | pifsr_tmp->framereg = pi->framereg; |
| 778 | |
| 779 | #ifdef DEBUG |
| 780 | printf_filtered ("Saved register r%d, offset = %d, framereg = r%d\n", |
| 781 | pifsr_tmp->reg, pifsr_tmp->offset, pifsr_tmp->framereg); |
| 782 | #endif |
| 783 | } |
| 784 | |
| 785 | #ifdef DEBUG |
| 786 | printf_filtered ("Framereg = r%d, frameoffset = %d\n", pi->framereg, pi->frameoffset); |
| 787 | #endif |
| 788 | |
| 789 | return current_pc; |
| 790 | } |
| 791 | |
| 792 | /* Function: find_callers_reg |
| 793 | Find REGNUM on the stack. Otherwise, it's in an active register. |
| 794 | One thing we might want to do here is to check REGNUM against the |
| 795 | clobber mask, and somehow flag it as invalid if it isn't saved on |
| 796 | the stack somewhere. This would provide a graceful failure mode |
| 797 | when trying to get the value of caller-saves registers for an inner |
| 798 | frame. */ |
| 799 | |
| 800 | CORE_ADDR |
| 801 | v850_find_callers_reg (struct frame_info *fi, int regnum) |
| 802 | { |
| 803 | for (; fi; fi = get_next_frame (fi)) |
| 804 | if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), get_frame_base (fi), |
| 805 | get_frame_base (fi))) |
| 806 | return deprecated_read_register_dummy (get_frame_pc (fi), |
| 807 | get_frame_base (fi), regnum); |
| 808 | else if (get_frame_saved_regs (fi)[regnum] != 0) |
| 809 | return read_memory_unsigned_integer (get_frame_saved_regs (fi)[regnum], |
| 810 | v850_register_raw_size (regnum)); |
| 811 | |
| 812 | return read_register (regnum); |
| 813 | } |
| 814 | |
| 815 | /* Function: frame_chain |
| 816 | Figure out the frame prior to FI. Unfortunately, this involves |
| 817 | scanning the prologue of the caller, which will also be done |
| 818 | shortly by v850_init_extra_frame_info. For the dummy frame, we |
| 819 | just return the stack pointer that was in use at the time the |
| 820 | function call was made. */ |
| 821 | |
| 822 | CORE_ADDR |
| 823 | v850_frame_chain (struct frame_info *fi) |
| 824 | { |
| 825 | struct prologue_info pi; |
| 826 | CORE_ADDR callers_pc, fp; |
| 827 | |
| 828 | /* First, find out who called us */ |
| 829 | callers_pc = DEPRECATED_FRAME_SAVED_PC (fi); |
| 830 | /* If caller is a call-dummy, then our FP bears no relation to his FP! */ |
| 831 | fp = v850_find_callers_reg (fi, E_FP_RAW_REGNUM); |
| 832 | if (DEPRECATED_PC_IN_CALL_DUMMY (callers_pc, fp, fp)) |
| 833 | return fp; /* caller is call-dummy: return oldest value of FP */ |
| 834 | |
| 835 | /* Caller is NOT a call-dummy, so everything else should just work. |
| 836 | Even if THIS frame is a call-dummy! */ |
| 837 | pi.pifsrs = NULL; |
| 838 | |
| 839 | v850_scan_prologue (callers_pc, &pi); |
| 840 | |
| 841 | if (pi.start_function) |
| 842 | return 0; /* Don't chain beyond the start function */ |
| 843 | |
| 844 | if (pi.framereg == E_FP_RAW_REGNUM) |
| 845 | return v850_find_callers_reg (fi, pi.framereg); |
| 846 | |
| 847 | return get_frame_base (fi) - pi.frameoffset; |
| 848 | } |
| 849 | |
| 850 | /* Function: skip_prologue |
| 851 | Return the address of the first code past the prologue of the function. */ |
| 852 | |
| 853 | CORE_ADDR |
| 854 | v850_skip_prologue (CORE_ADDR pc) |
| 855 | { |
| 856 | CORE_ADDR func_addr, func_end; |
| 857 | |
| 858 | /* See what the symbol table says */ |
| 859 | |
| 860 | if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) |
| 861 | { |
| 862 | struct symtab_and_line sal; |
| 863 | |
| 864 | sal = find_pc_line (func_addr, 0); |
| 865 | |
| 866 | if (sal.line != 0 && sal.end < func_end) |
| 867 | return sal.end; |
| 868 | else |
| 869 | /* Either there's no line info, or the line after the prologue is after |
| 870 | the end of the function. In this case, there probably isn't a |
| 871 | prologue. */ |
| 872 | return pc; |
| 873 | } |
| 874 | |
| 875 | /* We can't find the start of this function, so there's nothing we can do. */ |
| 876 | return pc; |
| 877 | } |
| 878 | |
| 879 | /* Function: pop_frame |
| 880 | This routine gets called when either the user uses the `return' |
| 881 | command, or the call dummy breakpoint gets hit. */ |
| 882 | |
| 883 | void |
| 884 | v850_pop_frame (void) |
| 885 | { |
| 886 | struct frame_info *frame = get_current_frame (); |
| 887 | int regnum; |
| 888 | |
| 889 | if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame), |
| 890 | get_frame_base (frame), |
| 891 | get_frame_base (frame))) |
| 892 | generic_pop_dummy_frame (); |
| 893 | else |
| 894 | { |
| 895 | write_register (E_PC_REGNUM, DEPRECATED_FRAME_SAVED_PC (frame)); |
| 896 | |
| 897 | for (regnum = 0; regnum < E_NUM_REGS; regnum++) |
| 898 | if (get_frame_saved_regs (frame)[regnum] != 0) |
| 899 | write_register (regnum, |
| 900 | read_memory_unsigned_integer (get_frame_saved_regs (frame)[regnum], |
| 901 | v850_register_raw_size (regnum))); |
| 902 | |
| 903 | write_register (E_SP_REGNUM, get_frame_base (frame)); |
| 904 | } |
| 905 | |
| 906 | flush_cached_frames (); |
| 907 | } |
| 908 | |
| 909 | /* Function: push_arguments |
| 910 | Setup arguments and RP for a call to the target. First four args |
| 911 | go in R6->R9, subsequent args go into sp + 16 -> sp + ... Structs |
| 912 | are passed by reference. 64 bit quantities (doubles and long |
| 913 | longs) may be split between the regs and the stack. When calling a |
| 914 | function that returns a struct, a pointer to the struct is passed |
| 915 | in as a secret first argument (always in R6). |
| 916 | |
| 917 | Stack space for the args has NOT been allocated: that job is up to us. |
| 918 | */ |
| 919 | |
| 920 | CORE_ADDR |
| 921 | v850_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
| 922 | int struct_return, CORE_ADDR struct_addr) |
| 923 | { |
| 924 | int argreg; |
| 925 | int argnum; |
| 926 | int len = 0; |
| 927 | int stack_offset; |
| 928 | |
| 929 | /* First, just for safety, make sure stack is aligned */ |
| 930 | sp &= ~3; |
| 931 | |
| 932 | /* The offset onto the stack at which we will start copying parameters |
| 933 | (after the registers are used up) begins at 16 rather than at zero. |
| 934 | I don't really know why, that's just the way it seems to work. */ |
| 935 | stack_offset = 16; |
| 936 | |
| 937 | /* Now make space on the stack for the args. */ |
| 938 | for (argnum = 0; argnum < nargs; argnum++) |
| 939 | len += ((TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3); |
| 940 | sp -= len + stack_offset; /* possibly over-allocating, but it works... */ |
| 941 | /* (you might think we could allocate 16 bytes */ |
| 942 | /* less, but the ABI seems to use it all! ) */ |
| 943 | |
| 944 | argreg = E_ARG0_REGNUM; |
| 945 | /* the struct_return pointer occupies the first parameter-passing reg */ |
| 946 | if (struct_return) |
| 947 | argreg++; |
| 948 | |
| 949 | /* Now load as many as possible of the first arguments into |
| 950 | registers, and push the rest onto the stack. There are 16 bytes |
| 951 | in four registers available. Loop thru args from first to last. */ |
| 952 | for (argnum = 0; argnum < nargs; argnum++) |
| 953 | { |
| 954 | int len; |
| 955 | char *val; |
| 956 | char valbuf[v850_register_raw_size (E_ARG0_REGNUM)]; |
| 957 | |
| 958 | if (!v850_type_is_scalar (VALUE_TYPE (*args)) |
| 959 | && TYPE_LENGTH (VALUE_TYPE (*args)) > E_MAX_RETTYPE_SIZE_IN_REGS) |
| 960 | { |
| 961 | store_unsigned_integer (valbuf, 4, VALUE_ADDRESS (*args)); |
| 962 | len = 4; |
| 963 | val = valbuf; |
| 964 | } |
| 965 | else |
| 966 | { |
| 967 | len = TYPE_LENGTH (VALUE_TYPE (*args)); |
| 968 | val = (char *) VALUE_CONTENTS (*args); |
| 969 | } |
| 970 | |
| 971 | while (len > 0) |
| 972 | if (argreg <= E_ARGLAST_REGNUM) |
| 973 | { |
| 974 | CORE_ADDR regval; |
| 975 | |
| 976 | regval = extract_address (val, v850_register_raw_size (argreg)); |
| 977 | write_register (argreg, regval); |
| 978 | |
| 979 | len -= v850_register_raw_size (argreg); |
| 980 | val += v850_register_raw_size (argreg); |
| 981 | argreg++; |
| 982 | } |
| 983 | else |
| 984 | { |
| 985 | write_memory (sp + stack_offset, val, 4); |
| 986 | |
| 987 | len -= 4; |
| 988 | val += 4; |
| 989 | stack_offset += 4; |
| 990 | } |
| 991 | args++; |
| 992 | } |
| 993 | return sp; |
| 994 | } |
| 995 | |
| 996 | /* Function: push_return_address (pc) |
| 997 | Set up the return address for the inferior function call. |
| 998 | Needed for targets where we don't actually execute a JSR/BSR instruction */ |
| 999 | |
| 1000 | CORE_ADDR |
| 1001 | v850_push_return_address (CORE_ADDR pc, CORE_ADDR sp) |
| 1002 | { |
| 1003 | write_register (E_RP_REGNUM, CALL_DUMMY_ADDRESS ()); |
| 1004 | return sp; |
| 1005 | } |
| 1006 | |
| 1007 | /* Function: frame_saved_pc |
| 1008 | Find the caller of this frame. We do this by seeing if E_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 | CORE_ADDR |
| 1015 | v850_frame_saved_pc (struct frame_info *fi) |
| 1016 | { |
| 1017 | if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), get_frame_base (fi), |
| 1018 | get_frame_base (fi))) |
| 1019 | return deprecated_read_register_dummy (get_frame_pc (fi), |
| 1020 | get_frame_base (fi), E_PC_REGNUM); |
| 1021 | else |
| 1022 | return v850_find_callers_reg (fi, E_RP_REGNUM); |
| 1023 | } |
| 1024 | |
| 1025 | |
| 1026 | /* Function: fix_call_dummy |
| 1027 | Pokes the callee function's address into the CALL_DUMMY assembly stub. |
| 1028 | Assumes that the CALL_DUMMY looks like this: |
| 1029 | jarl <offset24>, r31 |
| 1030 | trap |
| 1031 | */ |
| 1032 | |
| 1033 | void |
| 1034 | v850_fix_call_dummy (char *dummy, CORE_ADDR sp, CORE_ADDR fun, int nargs, |
| 1035 | struct value **args, struct type *type, int gcc_p) |
| 1036 | { |
| 1037 | long offset24; |
| 1038 | |
| 1039 | offset24 = (long) fun - (long) entry_point_address (); |
| 1040 | offset24 &= 0x3fffff; |
| 1041 | offset24 |= 0xff800000; /* jarl <offset24>, r31 */ |
| 1042 | |
| 1043 | store_unsigned_integer ((unsigned int *) &dummy[2], 2, offset24 & 0xffff); |
| 1044 | store_unsigned_integer ((unsigned int *) &dummy[0], 2, offset24 >> 16); |
| 1045 | } |
| 1046 | |
| 1047 | static CORE_ADDR |
| 1048 | v850_saved_pc_after_call (struct frame_info *ignore) |
| 1049 | { |
| 1050 | return read_register (E_RP_REGNUM); |
| 1051 | } |
| 1052 | |
| 1053 | static void |
| 1054 | v850_extract_return_value (struct type *type, char *regbuf, char *valbuf) |
| 1055 | { |
| 1056 | CORE_ADDR return_buffer; |
| 1057 | |
| 1058 | if (!v850_use_struct_convention (0, type)) |
| 1059 | { |
| 1060 | /* Scalar return values of <= 8 bytes are returned in |
| 1061 | E_V0_REGNUM to E_V1_REGNUM. */ |
| 1062 | memcpy (valbuf, |
| 1063 | ®buf[REGISTER_BYTE (E_V0_REGNUM)], |
| 1064 | TYPE_LENGTH (type)); |
| 1065 | } |
| 1066 | else |
| 1067 | { |
| 1068 | /* Aggregates and return values > 8 bytes are returned in memory, |
| 1069 | pointed to by R6. */ |
| 1070 | return_buffer = |
| 1071 | extract_address (regbuf + REGISTER_BYTE (E_V0_REGNUM), |
| 1072 | REGISTER_RAW_SIZE (E_V0_REGNUM)); |
| 1073 | |
| 1074 | read_memory (return_buffer, valbuf, TYPE_LENGTH (type)); |
| 1075 | } |
| 1076 | } |
| 1077 | |
| 1078 | const static unsigned char * |
| 1079 | v850_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
| 1080 | { |
| 1081 | static unsigned char breakpoint[] = { 0x85, 0x05 }; |
| 1082 | *lenptr = sizeof (breakpoint); |
| 1083 | return breakpoint; |
| 1084 | } |
| 1085 | |
| 1086 | static CORE_ADDR |
| 1087 | v850_extract_struct_value_address (char *regbuf) |
| 1088 | { |
| 1089 | return extract_address (regbuf + v850_register_byte (E_V0_REGNUM), |
| 1090 | v850_register_raw_size (E_V0_REGNUM)); |
| 1091 | } |
| 1092 | |
| 1093 | static void |
| 1094 | v850_store_return_value (struct type *type, char *valbuf) |
| 1095 | { |
| 1096 | CORE_ADDR return_buffer; |
| 1097 | |
| 1098 | if (!v850_use_struct_convention (0, type)) |
| 1099 | deprecated_write_register_bytes (REGISTER_BYTE (E_V0_REGNUM), valbuf, |
| 1100 | TYPE_LENGTH (type)); |
| 1101 | else |
| 1102 | { |
| 1103 | return_buffer = read_register (E_V0_REGNUM); |
| 1104 | write_memory (return_buffer, valbuf, TYPE_LENGTH (type)); |
| 1105 | } |
| 1106 | } |
| 1107 | |
| 1108 | static void |
| 1109 | v850_frame_init_saved_regs (struct frame_info *fi) |
| 1110 | { |
| 1111 | struct prologue_info pi; |
| 1112 | struct pifsr pifsrs[E_NUM_REGS + 1], *pifsr; |
| 1113 | CORE_ADDR func_addr, func_end; |
| 1114 | |
| 1115 | if (!get_frame_saved_regs (fi)) |
| 1116 | { |
| 1117 | frame_saved_regs_zalloc (fi); |
| 1118 | |
| 1119 | /* The call dummy doesn't save any registers on the stack, so we |
| 1120 | can return now. */ |
| 1121 | if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), get_frame_base (fi), |
| 1122 | get_frame_base (fi))) |
| 1123 | return; |
| 1124 | |
| 1125 | /* Find the beginning of this function, so we can analyze its |
| 1126 | prologue. */ |
| 1127 | if (find_pc_partial_function (get_frame_pc (fi), NULL, &func_addr, &func_end)) |
| 1128 | { |
| 1129 | pi.pifsrs = pifsrs; |
| 1130 | |
| 1131 | v850_scan_prologue (get_frame_pc (fi), &pi); |
| 1132 | |
| 1133 | if (!get_next_frame (fi) && pi.framereg == E_SP_REGNUM) |
| 1134 | deprecated_update_frame_base_hack (fi, read_register (pi.framereg) - pi.frameoffset); |
| 1135 | |
| 1136 | for (pifsr = pifsrs; pifsr->framereg; pifsr++) |
| 1137 | { |
| 1138 | get_frame_saved_regs (fi)[pifsr->reg] = pifsr->offset + get_frame_base (fi); |
| 1139 | |
| 1140 | if (pifsr->framereg == E_SP_REGNUM) |
| 1141 | get_frame_saved_regs (fi)[pifsr->reg] += pi.frameoffset; |
| 1142 | } |
| 1143 | } |
| 1144 | /* Else we're out of luck (can't debug completely stripped code). |
| 1145 | FIXME. */ |
| 1146 | } |
| 1147 | } |
| 1148 | |
| 1149 | /* Function: init_extra_frame_info |
| 1150 | Setup the frame's frame pointer, pc, and frame addresses for saved |
| 1151 | registers. Most of the work is done in scan_prologue(). |
| 1152 | |
| 1153 | Note that when we are called for the last frame (currently active frame), |
| 1154 | that get_frame_pc (fi) and fi->frame will already be setup. However, fi->frame will |
| 1155 | be valid only if this routine uses FP. For previous frames, fi-frame will |
| 1156 | always be correct (since that is derived from v850_frame_chain ()). |
| 1157 | |
| 1158 | We can be called with the PC in the call dummy under two |
| 1159 | circumstances. First, during normal backtracing, second, while |
| 1160 | figuring out the frame pointer just prior to calling the target |
| 1161 | function (see call_function_by_hand). */ |
| 1162 | |
| 1163 | static void |
| 1164 | v850_init_extra_frame_info (int fromleaf, struct frame_info *fi) |
| 1165 | { |
| 1166 | struct prologue_info pi; |
| 1167 | |
| 1168 | if (get_next_frame (fi)) |
| 1169 | deprecated_update_frame_pc_hack (fi, DEPRECATED_FRAME_SAVED_PC (get_next_frame (fi))); |
| 1170 | |
| 1171 | v850_frame_init_saved_regs (fi); |
| 1172 | } |
| 1173 | |
| 1174 | static void |
| 1175 | v850_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
| 1176 | { |
| 1177 | write_register (E_ARG0_REGNUM, addr); |
| 1178 | } |
| 1179 | |
| 1180 | static CORE_ADDR |
| 1181 | v850_target_read_fp (void) |
| 1182 | { |
| 1183 | return read_register (E_FP_RAW_REGNUM); |
| 1184 | } |
| 1185 | |
| 1186 | static struct gdbarch * |
| 1187 | v850_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 1188 | { |
| 1189 | static LONGEST call_dummy_words[1] = { 0 }; |
| 1190 | struct gdbarch_tdep *tdep = NULL; |
| 1191 | struct gdbarch *gdbarch; |
| 1192 | int i; |
| 1193 | |
| 1194 | /* find a candidate among the list of pre-declared architectures. */ |
| 1195 | arches = gdbarch_list_lookup_by_info (arches, &info); |
| 1196 | if (arches != NULL) |
| 1197 | return (arches->gdbarch); |
| 1198 | |
| 1199 | #if 0 |
| 1200 | tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep)); |
| 1201 | #endif |
| 1202 | |
| 1203 | /* Change the register names based on the current machine type. */ |
| 1204 | if (info.bfd_arch_info->arch != bfd_arch_v850) |
| 1205 | return 0; |
| 1206 | |
| 1207 | gdbarch = gdbarch_alloc (&info, 0); |
| 1208 | |
| 1209 | /* NOTE: cagney/2002-12-06: This can be deleted when this arch is |
| 1210 | ready to unwind the PC first (see frame.c:get_prev_frame()). */ |
| 1211 | set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default); |
| 1212 | |
| 1213 | for (i = 0; v850_processor_type_table[i].regnames != NULL; i++) |
| 1214 | { |
| 1215 | if (v850_processor_type_table[i].mach == info.bfd_arch_info->mach) |
| 1216 | { |
| 1217 | v850_register_names = v850_processor_type_table[i].regnames; |
| 1218 | deprecated_tm_print_insn_info.mach = info.bfd_arch_info->mach; |
| 1219 | break; |
| 1220 | } |
| 1221 | } |
| 1222 | |
| 1223 | /* |
| 1224 | * Basic register fields and methods. |
| 1225 | */ |
| 1226 | set_gdbarch_num_regs (gdbarch, E_NUM_REGS); |
| 1227 | set_gdbarch_num_pseudo_regs (gdbarch, 0); |
| 1228 | set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM); |
| 1229 | set_gdbarch_deprecated_fp_regnum (gdbarch, E_FP_REGNUM); |
| 1230 | set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM); |
| 1231 | set_gdbarch_register_name (gdbarch, v850_register_name); |
| 1232 | set_gdbarch_deprecated_register_size (gdbarch, v850_reg_size); |
| 1233 | set_gdbarch_deprecated_register_bytes (gdbarch, E_ALL_REGS_SIZE); |
| 1234 | set_gdbarch_register_byte (gdbarch, v850_register_byte); |
| 1235 | set_gdbarch_register_raw_size (gdbarch, v850_register_raw_size); |
| 1236 | set_gdbarch_deprecated_max_register_raw_size (gdbarch, v850_reg_size); |
| 1237 | set_gdbarch_register_virtual_size (gdbarch, v850_register_raw_size); |
| 1238 | set_gdbarch_deprecated_max_register_virtual_size (gdbarch, v850_reg_size); |
| 1239 | set_gdbarch_register_virtual_type (gdbarch, v850_reg_virtual_type); |
| 1240 | |
| 1241 | set_gdbarch_deprecated_target_read_fp (gdbarch, v850_target_read_fp); |
| 1242 | |
| 1243 | /* |
| 1244 | * Frame Info |
| 1245 | */ |
| 1246 | set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, v850_frame_init_saved_regs); |
| 1247 | set_gdbarch_deprecated_init_extra_frame_info (gdbarch, v850_init_extra_frame_info); |
| 1248 | set_gdbarch_deprecated_frame_chain (gdbarch, v850_frame_chain); |
| 1249 | set_gdbarch_deprecated_saved_pc_after_call (gdbarch, v850_saved_pc_after_call); |
| 1250 | set_gdbarch_deprecated_frame_saved_pc (gdbarch, v850_frame_saved_pc); |
| 1251 | set_gdbarch_skip_prologue (gdbarch, v850_skip_prologue); |
| 1252 | |
| 1253 | /* |
| 1254 | * Miscelany |
| 1255 | */ |
| 1256 | /* Stack grows up. */ |
| 1257 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 1258 | /* PC stops zero byte after a trap instruction |
| 1259 | (which means: exactly on trap instruction). */ |
| 1260 | set_gdbarch_decr_pc_after_break (gdbarch, 0); |
| 1261 | /* This value is almost never non-zero... */ |
| 1262 | set_gdbarch_function_start_offset (gdbarch, 0); |
| 1263 | /* This value is almost never non-zero... */ |
| 1264 | set_gdbarch_frame_args_skip (gdbarch, 0); |
| 1265 | /* OK to default this value to 'unknown'. */ |
| 1266 | set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown); |
| 1267 | |
| 1268 | /* |
| 1269 | * Call Dummies |
| 1270 | * |
| 1271 | * These values and methods are used when gdb calls a target function. */ |
| 1272 | set_gdbarch_deprecated_push_return_address (gdbarch, v850_push_return_address); |
| 1273 | set_gdbarch_deprecated_extract_return_value (gdbarch, v850_extract_return_value); |
| 1274 | set_gdbarch_deprecated_push_arguments (gdbarch, v850_push_arguments); |
| 1275 | set_gdbarch_deprecated_pop_frame (gdbarch, v850_pop_frame); |
| 1276 | set_gdbarch_deprecated_store_struct_return (gdbarch, v850_store_struct_return); |
| 1277 | set_gdbarch_deprecated_store_return_value (gdbarch, v850_store_return_value); |
| 1278 | set_gdbarch_deprecated_extract_struct_value_address (gdbarch, v850_extract_struct_value_address); |
| 1279 | set_gdbarch_use_struct_convention (gdbarch, v850_use_struct_convention); |
| 1280 | set_gdbarch_deprecated_call_dummy_words (gdbarch, call_dummy_nil); |
| 1281 | set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, 0); |
| 1282 | set_gdbarch_deprecated_fix_call_dummy (gdbarch, v850_fix_call_dummy); |
| 1283 | set_gdbarch_breakpoint_from_pc (gdbarch, v850_breakpoint_from_pc); |
| 1284 | |
| 1285 | set_gdbarch_int_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1286 | set_gdbarch_ptr_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1287 | set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1288 | set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); |
| 1289 | |
| 1290 | /* Should be using push_dummy_call. */ |
| 1291 | set_gdbarch_deprecated_dummy_write_sp (gdbarch, generic_target_write_sp); |
| 1292 | |
| 1293 | return gdbarch; |
| 1294 | } |
| 1295 | |
| 1296 | void |
| 1297 | _initialize_v850_tdep (void) |
| 1298 | { |
| 1299 | deprecated_tm_print_insn = print_insn_v850; |
| 1300 | register_gdbarch_init (bfd_arch_v850, v850_gdbarch_init); |
| 1301 | } |