| 1 | /* Target-dependent code for the Sanyo Xstormy16a (LC590000) processor. |
| 2 | Copyright 2001, Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 19 | Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "value.h" |
| 23 | #include "inferior.h" |
| 24 | #include "symfile.h" |
| 25 | #include "arch-utils.h" |
| 26 | #include "regcache.h" |
| 27 | #include "gdbcore.h" |
| 28 | #include "objfiles.h" |
| 29 | |
| 30 | struct gdbarch_tdep |
| 31 | { |
| 32 | /* gdbarch target dependent data here. Currently unused for Xstormy16. */ |
| 33 | }; |
| 34 | |
| 35 | /* Extra info which is saved in each frame_info. */ |
| 36 | struct frame_extra_info |
| 37 | { |
| 38 | int framesize; |
| 39 | int frameless_p; |
| 40 | }; |
| 41 | |
| 42 | enum gdb_regnum |
| 43 | { |
| 44 | /* Xstormy16 has 16 general purpose registers (R0-R15) plus PC. |
| 45 | Functions will return their values in register R2-R7 as they fit. |
| 46 | Otherwise a hidden pointer to an big enough area is given as argument |
| 47 | to the function in r2. Further arguments are beginning in r3 then. |
| 48 | R13 is used as frame pointer when GCC compiles w/o optimization |
| 49 | R14 is used as "PSW", displaying the CPU status. |
| 50 | R15 is used implicitely as stack pointer. */ |
| 51 | E_R0_REGNUM, |
| 52 | E_R1_REGNUM, |
| 53 | E_R2_REGNUM, E_1ST_ARG_REGNUM = E_R2_REGNUM, E_PTR_RET_REGNUM = E_R2_REGNUM, |
| 54 | E_R3_REGNUM, |
| 55 | E_R4_REGNUM, |
| 56 | E_R5_REGNUM, |
| 57 | E_R6_REGNUM, |
| 58 | E_R7_REGNUM, E_LST_ARG_REGNUM = E_R7_REGNUM, |
| 59 | E_R8_REGNUM, |
| 60 | E_R9_REGNUM, |
| 61 | E_R10_REGNUM, |
| 62 | E_R11_REGNUM, |
| 63 | E_R12_REGNUM, |
| 64 | E_R13_REGNUM, E_FP_REGNUM = E_R13_REGNUM, |
| 65 | E_R14_REGNUM, E_PSW_REGNUM = E_R14_REGNUM, |
| 66 | E_R15_REGNUM, E_SP_REGNUM = E_R15_REGNUM, |
| 67 | E_PC_REGNUM, |
| 68 | E_NUM_REGS |
| 69 | }; |
| 70 | |
| 71 | /* Size of instructions, registers, etc. */ |
| 72 | enum |
| 73 | { |
| 74 | xstormy16_inst_size = 2, |
| 75 | xstormy16_reg_size = 2, |
| 76 | xstormy16_pc_size = 4 |
| 77 | }; |
| 78 | |
| 79 | /* Size of return datatype which fits into the remaining return registers. */ |
| 80 | #define E_MAX_RETTYPE_SIZE(regnum) ((E_LST_ARG_REGNUM - (regnum) + 1) \ |
| 81 | * xstormy16_reg_size) |
| 82 | |
| 83 | /* Size of return datatype which fits into all return registers. */ |
| 84 | enum |
| 85 | { |
| 86 | E_MAX_RETTYPE_SIZE_IN_REGS = E_MAX_RETTYPE_SIZE (E_R2_REGNUM) |
| 87 | }; |
| 88 | |
| 89 | |
| 90 | /* Size of all registers as a whole. */ |
| 91 | enum |
| 92 | { |
| 93 | E_ALL_REGS_SIZE = (E_NUM_REGS - 1) * xstormy16_reg_size + xstormy16_pc_size |
| 94 | }; |
| 95 | |
| 96 | /* Function: xstormy16_register_name |
| 97 | Returns the name of the standard Xstormy16 register N. */ |
| 98 | |
| 99 | static char * |
| 100 | xstormy16_register_name (int regnum) |
| 101 | { |
| 102 | static char *register_names[] = { |
| 103 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| 104 | "r8", "r9", "r10", "r11", "r12", "r13", |
| 105 | "psw", "sp", "pc" |
| 106 | }; |
| 107 | |
| 108 | if (regnum < 0 || |
| 109 | regnum >= sizeof (register_names) / sizeof (register_names[0])) |
| 110 | internal_error (__FILE__, __LINE__, |
| 111 | "xstormy16_register_name: illegal register number %d", |
| 112 | regnum); |
| 113 | else |
| 114 | return register_names[regnum]; |
| 115 | |
| 116 | } |
| 117 | |
| 118 | /* Function: xstormy16_register_byte |
| 119 | Returns the byte position in the register cache for register N. */ |
| 120 | |
| 121 | static int |
| 122 | xstormy16_register_byte (int regnum) |
| 123 | { |
| 124 | if (regnum < 0 || regnum >= E_NUM_REGS) |
| 125 | internal_error (__FILE__, __LINE__, |
| 126 | "xstormy16_register_byte: illegal register number %d", |
| 127 | regnum); |
| 128 | else |
| 129 | /* All registers occupy 2 bytes in the regcache except for PC |
| 130 | which is the last one. Therefore the byte position is still |
| 131 | simply a multiple of 2. */ |
| 132 | return regnum * xstormy16_reg_size; |
| 133 | } |
| 134 | |
| 135 | /* Function: xstormy16_register_raw_size |
| 136 | Returns the number of bytes occupied by the register on the target. */ |
| 137 | |
| 138 | static int |
| 139 | xstormy16_register_raw_size (int regnum) |
| 140 | { |
| 141 | if (regnum < 0 || regnum >= E_NUM_REGS) |
| 142 | internal_error (__FILE__, __LINE__, |
| 143 | "xstormy16_register_raw_size: illegal register number %d", |
| 144 | regnum); |
| 145 | /* Only the PC has 4 Byte, all other registers 2 Byte. */ |
| 146 | else if (regnum == E_PC_REGNUM) |
| 147 | return xstormy16_pc_size; |
| 148 | else |
| 149 | return xstormy16_reg_size; |
| 150 | } |
| 151 | |
| 152 | /* Function: xstormy16_register_virtual_size |
| 153 | Returns the number of bytes occupied by the register as represented |
| 154 | internally by gdb. */ |
| 155 | |
| 156 | static int |
| 157 | xstormy16_register_virtual_size (int regnum) |
| 158 | { |
| 159 | return xstormy16_register_raw_size (regnum); |
| 160 | } |
| 161 | |
| 162 | /* Function: xstormy16_reg_virtual_type |
| 163 | Returns the default type for register N. */ |
| 164 | |
| 165 | static struct type * |
| 166 | xstormy16_reg_virtual_type (int regnum) |
| 167 | { |
| 168 | if (regnum < 0 || regnum >= E_NUM_REGS) |
| 169 | internal_error (__FILE__, __LINE__, |
| 170 | "xstormy16_register_virtual_type: illegal register number %d", |
| 171 | regnum); |
| 172 | else if (regnum == E_PC_REGNUM) |
| 173 | return builtin_type_uint32; |
| 174 | else |
| 175 | return builtin_type_uint16; |
| 176 | } |
| 177 | |
| 178 | /* Function: xstormy16_get_saved_register |
| 179 | Find a register's saved value on the call stack. */ |
| 180 | |
| 181 | static void |
| 182 | xstormy16_get_saved_register (char *raw_buffer, |
| 183 | int *optimized, |
| 184 | CORE_ADDR *addrp, |
| 185 | struct frame_info *fi, |
| 186 | int regnum, enum lval_type *lval) |
| 187 | { |
| 188 | generic_get_saved_register (raw_buffer, optimized, addrp, fi, regnum, lval); |
| 189 | } |
| 190 | |
| 191 | /* Function: xstormy16_type_is_scalar |
| 192 | Makes the decision if a given type is a scalar types. Scalar |
| 193 | types are returned in the registers r2-r7 as they fit. */ |
| 194 | |
| 195 | static int |
| 196 | xstormy16_type_is_scalar (struct type *t) |
| 197 | { |
| 198 | return (TYPE_CODE(t) != TYPE_CODE_STRUCT |
| 199 | && TYPE_CODE(t) != TYPE_CODE_UNION |
| 200 | && TYPE_CODE(t) != TYPE_CODE_ARRAY); |
| 201 | } |
| 202 | |
| 203 | /* Function: xstormy16_extract_return_value |
| 204 | Copy the function's return value into VALBUF. |
| 205 | This function is called only in the context of "target function calls", |
| 206 | ie. when the debugger forces a function to be called in the child, and |
| 207 | when the debugger forces a function to return prematurely via the |
| 208 | "return" command. */ |
| 209 | |
| 210 | static void |
| 211 | xstormy16_extract_return_value (struct type *type, char *regbuf, char *valbuf) |
| 212 | { |
| 213 | CORE_ADDR return_buffer; |
| 214 | int offset = 0; |
| 215 | |
| 216 | if (xstormy16_type_is_scalar (type) |
| 217 | && TYPE_LENGTH (type) <= E_MAX_RETTYPE_SIZE_IN_REGS) |
| 218 | { |
| 219 | /* Scalar return values of <= 12 bytes are returned in |
| 220 | E_1ST_ARG_REGNUM to E_LST_ARG_REGNUM. */ |
| 221 | memcpy (valbuf, |
| 222 | ®buf[REGISTER_BYTE (E_1ST_ARG_REGNUM)] + offset, |
| 223 | TYPE_LENGTH (type)); |
| 224 | } |
| 225 | else |
| 226 | { |
| 227 | /* Aggregates and return values > 12 bytes are returned in memory, |
| 228 | pointed to by R2. */ |
| 229 | return_buffer = |
| 230 | extract_address (regbuf + REGISTER_BYTE (E_PTR_RET_REGNUM), |
| 231 | REGISTER_RAW_SIZE (E_PTR_RET_REGNUM)); |
| 232 | |
| 233 | read_memory (return_buffer, valbuf, TYPE_LENGTH (type)); |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | /* Function: xstormy16_push_arguments |
| 238 | Setup the function arguments for GDB to call a function in the inferior. |
| 239 | Called only in the context of a target function call from the debugger. |
| 240 | Returns the value of the SP register after the args are pushed. |
| 241 | */ |
| 242 | |
| 243 | static CORE_ADDR |
| 244 | xstormy16_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
| 245 | int struct_return, CORE_ADDR struct_addr) |
| 246 | { |
| 247 | CORE_ADDR stack_dest = sp; |
| 248 | int argreg = E_1ST_ARG_REGNUM; |
| 249 | int i, j; |
| 250 | int typelen, slacklen; |
| 251 | char *val; |
| 252 | |
| 253 | /* If struct_return is true, then the struct return address will |
| 254 | consume one argument-passing register. */ |
| 255 | if (struct_return) |
| 256 | argreg++; |
| 257 | |
| 258 | /* Arguments are passed in R2-R7 as they fit. If an argument doesn't |
| 259 | fit in the remaining registers we're switching over to the stack. |
| 260 | No argument is put on stack partially and as soon as we switched |
| 261 | over to stack no further argument is put in a register even if it |
| 262 | would fit in the remaining unused registers. */ |
| 263 | for (i = 0; i < nargs && argreg <= E_LST_ARG_REGNUM; i++) |
| 264 | { |
| 265 | typelen = TYPE_LENGTH (VALUE_ENCLOSING_TYPE (args[i])); |
| 266 | if (typelen > E_MAX_RETTYPE_SIZE (argreg)) |
| 267 | break; |
| 268 | |
| 269 | /* Put argument into registers wordwise. */ |
| 270 | val = VALUE_CONTENTS (args[i]); |
| 271 | for (j = 0; j < typelen; j += xstormy16_reg_size) |
| 272 | write_register (argreg++, |
| 273 | extract_unsigned_integer (val + j, |
| 274 | typelen - j == |
| 275 | 1 ? 1 : |
| 276 | xstormy16_reg_size)); |
| 277 | } |
| 278 | |
| 279 | /* Align SP */ |
| 280 | if (stack_dest & 1) |
| 281 | ++stack_dest; |
| 282 | |
| 283 | /* Loop backwards through remaining arguments and push them on the stack, |
| 284 | wordaligned. */ |
| 285 | for (j = nargs - 1; j >= i; j--) |
| 286 | { |
| 287 | typelen = TYPE_LENGTH (VALUE_ENCLOSING_TYPE (args[j])); |
| 288 | slacklen = typelen & 1; |
| 289 | val = alloca (typelen + slacklen); |
| 290 | memcpy (val, VALUE_CONTENTS (args[j]), typelen); |
| 291 | memset (val + typelen, 0, slacklen); |
| 292 | |
| 293 | /* Now write this data to the stack. The stack grows upwards. */ |
| 294 | write_memory (stack_dest, val, typelen + slacklen); |
| 295 | stack_dest += typelen + slacklen; |
| 296 | } |
| 297 | |
| 298 | /* And that should do it. Return the new stack pointer. */ |
| 299 | return stack_dest; |
| 300 | } |
| 301 | |
| 302 | /* Function: xstormy16_push_return_address (pc) |
| 303 | Setup the return address for GDB to call a function in the inferior. |
| 304 | Called only in the context of a target function call from the debugger. |
| 305 | Returns the value of the SP register when the operation is finished |
| 306 | (which may or may not be the same as before). |
| 307 | */ |
| 308 | |
| 309 | CORE_ADDR |
| 310 | xstormy16_push_return_address (CORE_ADDR pc, CORE_ADDR sp) |
| 311 | { |
| 312 | unsigned char buf[xstormy16_pc_size]; |
| 313 | |
| 314 | store_unsigned_integer (buf, xstormy16_pc_size, CALL_DUMMY_ADDRESS ()); |
| 315 | write_memory (sp, buf, xstormy16_pc_size); |
| 316 | return sp + xstormy16_pc_size; |
| 317 | } |
| 318 | |
| 319 | /* Function: xstormy16_pop_frame |
| 320 | Destroy the innermost (Top-Of-Stack) stack frame, restoring the |
| 321 | machine state that was in effect before the frame was created. |
| 322 | Used in the contexts of the "return" command, and of |
| 323 | target function calls from the debugger. |
| 324 | */ |
| 325 | |
| 326 | static void |
| 327 | xstormy16_pop_frame (void) |
| 328 | { |
| 329 | struct frame_info *fi = get_current_frame (); |
| 330 | int i; |
| 331 | |
| 332 | if (fi == NULL) |
| 333 | return; /* paranoia */ |
| 334 | |
| 335 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
| 336 | { |
| 337 | generic_pop_dummy_frame (); |
| 338 | } |
| 339 | else |
| 340 | { |
| 341 | /* Restore the saved regs. */ |
| 342 | for (i = 0; i < NUM_REGS; i++) |
| 343 | if (fi->saved_regs[i]) |
| 344 | { |
| 345 | if (i == SP_REGNUM) |
| 346 | write_register (i, fi->saved_regs[i]); |
| 347 | else if (i == E_PC_REGNUM) |
| 348 | write_register (i, read_memory_integer (fi->saved_regs[i], |
| 349 | xstormy16_pc_size)); |
| 350 | else |
| 351 | write_register (i, read_memory_integer (fi->saved_regs[i], |
| 352 | xstormy16_reg_size)); |
| 353 | } |
| 354 | /* Restore the PC */ |
| 355 | write_register (PC_REGNUM, FRAME_SAVED_PC (fi)); |
| 356 | flush_cached_frames (); |
| 357 | } |
| 358 | return; |
| 359 | } |
| 360 | |
| 361 | /* Function: xstormy16_store_struct_return |
| 362 | Copy the (struct) function return value to its destined location. |
| 363 | Called only in the context of a target function call from the debugger. |
| 364 | */ |
| 365 | |
| 366 | static void |
| 367 | xstormy16_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
| 368 | { |
| 369 | write_register (E_PTR_RET_REGNUM, addr); |
| 370 | } |
| 371 | |
| 372 | /* Function: xstormy16_store_return_value |
| 373 | Copy the function return value from VALBUF into the |
| 374 | proper location for a function return. |
| 375 | Called only in the context of the "return" command. |
| 376 | */ |
| 377 | |
| 378 | static void |
| 379 | xstormy16_store_return_value (struct type *type, char *valbuf) |
| 380 | { |
| 381 | CORE_ADDR return_buffer; |
| 382 | char buf[xstormy16_reg_size]; |
| 383 | |
| 384 | if (xstormy16_type_is_scalar (type) && TYPE_LENGTH (type) == 1) |
| 385 | { |
| 386 | /* Add leading zeros to the value. */ |
| 387 | memset (buf, 0, xstormy16_reg_size); |
| 388 | memcpy (buf, valbuf, 1); |
| 389 | write_register_gen (E_1ST_ARG_REGNUM, buf); |
| 390 | } |
| 391 | else if (xstormy16_type_is_scalar (type) && |
| 392 | TYPE_LENGTH (type) <= E_MAX_RETTYPE_SIZE_IN_REGS) |
| 393 | write_register_bytes (REGISTER_BYTE (E_1ST_ARG_REGNUM), |
| 394 | valbuf, TYPE_LENGTH (type)); |
| 395 | else |
| 396 | { |
| 397 | return_buffer = read_register (E_PTR_RET_REGNUM); |
| 398 | write_memory (return_buffer, valbuf, TYPE_LENGTH (type)); |
| 399 | } |
| 400 | } |
| 401 | |
| 402 | /* Function: xstormy16_extract_struct_value_address |
| 403 | Returns the address in which a function should return a struct value. |
| 404 | Used in the contexts of the "return" command, and of |
| 405 | target function calls from the debugger. |
| 406 | */ |
| 407 | |
| 408 | static CORE_ADDR |
| 409 | xstormy16_extract_struct_value_address (char *regbuf) |
| 410 | { |
| 411 | return extract_address (regbuf + |
| 412 | xstormy16_register_byte (E_PTR_RET_REGNUM), |
| 413 | xstormy16_reg_size); |
| 414 | } |
| 415 | |
| 416 | /* Function: xstormy16_use_struct_convention |
| 417 | Returns non-zero if the given struct type will be returned using |
| 418 | a special convention, rather than the normal function return method. |
| 419 | 7sed in the contexts of the "return" command, and of |
| 420 | target function calls from the debugger. |
| 421 | */ |
| 422 | |
| 423 | static int |
| 424 | xstormy16_use_struct_convention (int gcc_p, struct type *type) |
| 425 | { |
| 426 | return !xstormy16_type_is_scalar (type) |
| 427 | || TYPE_LENGTH (type) > E_MAX_RETTYPE_SIZE_IN_REGS; |
| 428 | } |
| 429 | |
| 430 | /* Function: frame_saved_register |
| 431 | Returns the value that regnum had in frame fi |
| 432 | (saved in fi or in one of its children). |
| 433 | */ |
| 434 | |
| 435 | static CORE_ADDR |
| 436 | xstormy16_frame_saved_register (struct frame_info *fi, int regnum) |
| 437 | { |
| 438 | int size = xstormy16_register_raw_size (regnum); |
| 439 | char *buf = (char *) alloca (size); |
| 440 | |
| 441 | generic_get_saved_register (buf, NULL, NULL, fi, regnum, NULL); |
| 442 | return (CORE_ADDR) extract_unsigned_integer (buf, size); |
| 443 | } |
| 444 | |
| 445 | /* Function: xstormy16_scan_prologue |
| 446 | Decode the instructions within the given address range. |
| 447 | Decide when we must have reached the end of the function prologue. |
| 448 | If a frame_info pointer is provided, fill in its saved_regs etc. |
| 449 | |
| 450 | Returns the address of the first instruction after the prologue. |
| 451 | */ |
| 452 | |
| 453 | static CORE_ADDR |
| 454 | xstormy16_scan_prologue (CORE_ADDR start_addr, CORE_ADDR end_addr, |
| 455 | struct frame_info *fi, int *frameless) |
| 456 | { |
| 457 | CORE_ADDR sp = 0, fp = 0; |
| 458 | CORE_ADDR next_addr; |
| 459 | ULONGEST inst, inst2; |
| 460 | LONGEST offset; |
| 461 | int regnum; |
| 462 | |
| 463 | if (frameless) |
| 464 | *frameless = 1; |
| 465 | if (fi) |
| 466 | { |
| 467 | /* In a call dummy, don't touch the frame. */ |
| 468 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
| 469 | return start_addr; |
| 470 | |
| 471 | /* Grab the frame-relative values of SP and FP, needed below. |
| 472 | The frame_saved_register function will find them on the |
| 473 | stack or in the registers as appropriate. */ |
| 474 | sp = xstormy16_frame_saved_register (fi, E_SP_REGNUM); |
| 475 | fp = xstormy16_frame_saved_register (fi, E_FP_REGNUM); |
| 476 | |
| 477 | /* Initialize framesize with size of PC put on stack by CALLF inst. */ |
| 478 | fi->extra_info->framesize = xstormy16_pc_size; |
| 479 | } |
| 480 | for (next_addr = start_addr; |
| 481 | next_addr < end_addr; next_addr += xstormy16_inst_size) |
| 482 | { |
| 483 | inst = read_memory_unsigned_integer (next_addr, xstormy16_inst_size); |
| 484 | inst2 = read_memory_unsigned_integer (next_addr + xstormy16_inst_size, |
| 485 | xstormy16_inst_size); |
| 486 | |
| 487 | if (inst >= 0x0082 && inst <= 0x008d) /* push r2 .. push r13 */ |
| 488 | { |
| 489 | if (fi) |
| 490 | { |
| 491 | regnum = inst & 0x000f; |
| 492 | fi->saved_regs[regnum] = fi->extra_info->framesize; |
| 493 | fi->extra_info->framesize += xstormy16_reg_size; |
| 494 | } |
| 495 | } |
| 496 | |
| 497 | /* optional stack allocation for args and local vars <= 4 byte */ |
| 498 | else if (inst == 0x301f || inst == 0x303f) /* inc r15, #0x1/#0x3 */ |
| 499 | { |
| 500 | if (fi) /* Record the frame size. */ |
| 501 | fi->extra_info->framesize += ((inst & 0x0030) >> 4) + 1; |
| 502 | } |
| 503 | |
| 504 | /* optional stack allocation for args and local vars > 4 && < 16 byte */ |
| 505 | else if ((inst & 0xff0f) == 0x510f) /* 51Hf add r15, #0xH */ |
| 506 | { |
| 507 | if (fi) /* Record the frame size. */ |
| 508 | fi->extra_info->framesize += (inst & 0x00f0) >> 4; |
| 509 | } |
| 510 | |
| 511 | /* optional stack allocation for args and local vars >= 16 byte */ |
| 512 | else if (inst == 0x314f && inst2 >= 0x0010) /* 314f HHHH add r15, #0xH */ |
| 513 | { |
| 514 | if (fi) /* Record the frame size. */ |
| 515 | fi->extra_info->framesize += inst2; |
| 516 | next_addr += xstormy16_inst_size; |
| 517 | } |
| 518 | |
| 519 | else if (inst == 0x46fd) /* mov r13, r15 */ |
| 520 | { |
| 521 | if (fi) /* Record that the frame pointer is in use. */ |
| 522 | fi->extra_info->frameless_p = 0; |
| 523 | if (frameless) |
| 524 | *frameless = 0; |
| 525 | } |
| 526 | |
| 527 | /* optional copying of args in r2-r7 to r10-r13 */ |
| 528 | /* Probably only in optimized case but legal action for prologue */ |
| 529 | else if ((inst & 0xff00) == 0x4600 /* 46SD mov rD, rS */ |
| 530 | && (inst & 0x00f0) >= 0x0020 && (inst & 0x00f0) <= 0x0070 |
| 531 | && (inst & 0x000f) >= 0x00a0 && (inst & 0x000f) <= 0x000d) |
| 532 | ; |
| 533 | |
| 534 | /* optional copying of args in r2-r7 to stack */ |
| 535 | /* 72DS HHHH mov.b (rD, 0xHHHH), r(S-8) (bit3 always 1, bit2-0 = reg) */ |
| 536 | /* 73DS HHHH mov.w (rD, 0xHHHH), r(S-8) */ |
| 537 | else if ((inst & 0xfed8) == 0x72d8 && (inst & 0x0007) >= 2) |
| 538 | { |
| 539 | if (fi) |
| 540 | { |
| 541 | regnum = inst & 0x0007; |
| 542 | /* Only 12 of 16 bits of the argument are used for the |
| 543 | signed offset. */ |
| 544 | offset = (LONGEST) (inst2 & 0x0fff); |
| 545 | if (offset & 0x0800) |
| 546 | offset -= 0x1000; |
| 547 | |
| 548 | fi->saved_regs[regnum] = fi->extra_info->framesize + offset; |
| 549 | } |
| 550 | next_addr += xstormy16_inst_size; |
| 551 | } |
| 552 | |
| 553 | #if 0 |
| 554 | /* 2001-08-10: Not part of the prologue anymore due to change in |
| 555 | ABI. r8 and r9 are not used for argument passing anymore. */ |
| 556 | |
| 557 | /* optional copying of r8, r9 to stack */ |
| 558 | /* 46S7; 73Df HHHH mov.w r7,rS; mov.w (rD, 0xHHHH), r7 D=8,9; S=13,15 */ |
| 559 | /* 46S7; 72df HHHH mov.w r7,rS; mov.b (rD, 0xHHHH), r7 D=8,9; S=13,15 */ |
| 560 | else if ((inst & 0xffef) == 0x4687 && (inst2 & 0xfedf) == 0x72df) |
| 561 | { |
| 562 | next_addr += xstormy16_inst_size; |
| 563 | if (fi) |
| 564 | { |
| 565 | regnum = (inst & 0x00f0) >> 4; |
| 566 | inst = inst2; |
| 567 | inst2 = read_memory_unsigned_integer (next_addr |
| 568 | + xstormy16_inst_size, |
| 569 | xstormy16_inst_size); |
| 570 | /* Only 12 of 16 bits of the argument are used for the |
| 571 | signed offset. */ |
| 572 | offset = (LONGEST) (inst2 & 0x0fff); |
| 573 | if (offset & 0x0800) |
| 574 | offset -= 0x1000; |
| 575 | |
| 576 | fi->saved_regs[regnum] = fi->extra_info->framesize + offset; |
| 577 | } |
| 578 | next_addr += xstormy16_inst_size; |
| 579 | } |
| 580 | #endif |
| 581 | |
| 582 | else /* Not a prologue instruction. */ |
| 583 | break; |
| 584 | } |
| 585 | |
| 586 | if (fi) |
| 587 | { |
| 588 | /* Special handling for the "saved" address of the SP: |
| 589 | The SP is of course never saved on the stack at all, so |
| 590 | by convention what we put here is simply the previous |
| 591 | _value_ of the SP (as opposed to an address where the |
| 592 | previous value would have been pushed). */ |
| 593 | if (fi->extra_info->frameless_p) |
| 594 | { |
| 595 | fi->saved_regs[E_SP_REGNUM] = sp - fi->extra_info->framesize; |
| 596 | fi->frame = sp; |
| 597 | } |
| 598 | else |
| 599 | { |
| 600 | fi->saved_regs[E_SP_REGNUM] = fp - fi->extra_info->framesize; |
| 601 | fi->frame = fp; |
| 602 | } |
| 603 | |
| 604 | /* So far only offsets to the beginning of the frame are |
| 605 | saved in the saved_regs. Now we now the relation between |
| 606 | sp, fp and framesize. We know the beginning of the frame |
| 607 | so we can translate the register offsets to real addresses. */ |
| 608 | for (regnum = 0; regnum < E_SP_REGNUM; ++regnum) |
| 609 | if (fi->saved_regs[regnum]) |
| 610 | fi->saved_regs[regnum] += fi->saved_regs[E_SP_REGNUM]; |
| 611 | |
| 612 | /* Save address of PC on stack. */ |
| 613 | fi->saved_regs[E_PC_REGNUM] = fi->saved_regs[E_SP_REGNUM]; |
| 614 | } |
| 615 | |
| 616 | return next_addr; |
| 617 | } |
| 618 | |
| 619 | /* Function: xstormy16_skip_prologue |
| 620 | If the input address is in a function prologue, |
| 621 | returns the address of the end of the prologue; |
| 622 | else returns the input address. |
| 623 | |
| 624 | Note: the input address is likely to be the function start, |
| 625 | since this function is mainly used for advancing a breakpoint |
| 626 | to the first line, or stepping to the first line when we have |
| 627 | stepped into a function call. */ |
| 628 | |
| 629 | static CORE_ADDR |
| 630 | xstormy16_skip_prologue (CORE_ADDR pc) |
| 631 | { |
| 632 | CORE_ADDR func_addr = 0, func_end = 0; |
| 633 | char *func_name; |
| 634 | |
| 635 | if (find_pc_partial_function (pc, &func_name, &func_addr, &func_end)) |
| 636 | { |
| 637 | struct symtab_and_line sal; |
| 638 | struct symbol *sym; |
| 639 | |
| 640 | /* Don't trust line number debug info in frameless functions. */ |
| 641 | int frameless = 1; |
| 642 | CORE_ADDR plg_end = xstormy16_scan_prologue (func_addr, func_end, |
| 643 | NULL, &frameless); |
| 644 | if (frameless) |
| 645 | return plg_end; |
| 646 | |
| 647 | /* Found a function. */ |
| 648 | sym = lookup_symbol (func_name, NULL, VAR_NAMESPACE, NULL, NULL); |
| 649 | /* Don't use line number debug info for assembly source files. */ |
| 650 | if (sym && SYMBOL_LANGUAGE (sym) != language_asm) |
| 651 | { |
| 652 | sal = find_pc_line (func_addr, 0); |
| 653 | if (sal.end && sal.end < func_end) |
| 654 | { |
| 655 | /* Found a line number, use it as end of prologue. */ |
| 656 | return sal.end; |
| 657 | } |
| 658 | } |
| 659 | /* No useable line symbol. Use result of prologue parsing method. */ |
| 660 | return plg_end; |
| 661 | } |
| 662 | |
| 663 | /* No function symbol -- just return the PC. */ |
| 664 | |
| 665 | return (CORE_ADDR) pc; |
| 666 | } |
| 667 | |
| 668 | /* The epilogue is defined here as the area at the end of a function, |
| 669 | either on the `ret' instruction itself or after an instruction which |
| 670 | destroys the function's stack frame. */ |
| 671 | static int |
| 672 | xstormy16_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 673 | { |
| 674 | CORE_ADDR addr, func_addr = 0, func_end = 0; |
| 675 | |
| 676 | if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) |
| 677 | { |
| 678 | ULONGEST inst, inst2; |
| 679 | CORE_ADDR addr = func_end - xstormy16_inst_size; |
| 680 | |
| 681 | /* The Xstormy16 epilogue is max. 14 bytes long. */ |
| 682 | if (pc < func_end - 7 * xstormy16_inst_size) |
| 683 | return 0; |
| 684 | |
| 685 | /* Check if we're on a `ret' instruction. Otherwise it's |
| 686 | too dangerous to proceed. */ |
| 687 | inst = read_memory_unsigned_integer (addr, xstormy16_inst_size); |
| 688 | if (inst != 0x0003) |
| 689 | return 0; |
| 690 | |
| 691 | while ((addr -= xstormy16_inst_size) >= func_addr) |
| 692 | { |
| 693 | inst = read_memory_unsigned_integer (addr, xstormy16_inst_size); |
| 694 | if (inst >= 0x009a && inst <= 0x009d) /* pop r10...r13 */ |
| 695 | continue; |
| 696 | if (inst == 0x305f || inst == 0x307f) /* dec r15, #0x1/#0x3 */ |
| 697 | break; |
| 698 | inst2 = read_memory_unsigned_integer (addr - xstormy16_inst_size, |
| 699 | xstormy16_inst_size); |
| 700 | if (inst2 == 0x314f && inst >= 0x8000) /* add r15, neg. value */ |
| 701 | { |
| 702 | addr -= xstormy16_inst_size; |
| 703 | break; |
| 704 | } |
| 705 | return 0; |
| 706 | } |
| 707 | if (pc > addr) |
| 708 | return 1; |
| 709 | } |
| 710 | return 0; |
| 711 | } |
| 712 | |
| 713 | /* Function: xstormy16_frame_init_saved_regs |
| 714 | Set up the 'saved_regs' array. |
| 715 | This is a data structure containing the addresses on the stack |
| 716 | where each register has been saved, for each stack frame. |
| 717 | Registers that have not been saved will have zero here. |
| 718 | The stack register is special: rather than the address where the |
| 719 | stack register has been saved, saved_regs[SP_REGNUM] will have the |
| 720 | actual value of the previous frame's stack register. |
| 721 | |
| 722 | This function may be called in any context where the saved register |
| 723 | values may be needed (backtrace, frame_info, get_saved_register). |
| 724 | On many targets, it is called directly by init_extra_frame_info, |
| 725 | in part because the information may be needed immediately by |
| 726 | frame_chain. |
| 727 | */ |
| 728 | |
| 729 | static void |
| 730 | xstormy16_frame_init_saved_regs (struct frame_info *fi) |
| 731 | { |
| 732 | CORE_ADDR func_addr, func_end; |
| 733 | |
| 734 | if (!fi->saved_regs) |
| 735 | { |
| 736 | frame_saved_regs_zalloc (fi); |
| 737 | |
| 738 | /* Find the beginning of this function, so we can analyze its |
| 739 | prologue. */ |
| 740 | if (find_pc_partial_function (fi->pc, NULL, &func_addr, &func_end)) |
| 741 | xstormy16_scan_prologue (func_addr, fi->pc, fi, NULL); |
| 742 | /* Else we're out of luck (can't debug completely stripped code). |
| 743 | FIXME. */ |
| 744 | } |
| 745 | } |
| 746 | |
| 747 | /* Function: xstormy16_frame_saved_pc |
| 748 | Returns the return address for the selected frame. |
| 749 | Called by frame_info, frame_chain_valid, and sometimes by |
| 750 | get_prev_frame. |
| 751 | */ |
| 752 | |
| 753 | static CORE_ADDR |
| 754 | xstormy16_frame_saved_pc (struct frame_info *fi) |
| 755 | { |
| 756 | CORE_ADDR saved_pc; |
| 757 | |
| 758 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
| 759 | { |
| 760 | saved_pc = generic_read_register_dummy (fi->pc, fi->frame, E_PC_REGNUM); |
| 761 | } |
| 762 | else |
| 763 | { |
| 764 | saved_pc = read_memory_unsigned_integer (fi->saved_regs[E_PC_REGNUM], |
| 765 | xstormy16_pc_size); |
| 766 | } |
| 767 | |
| 768 | return saved_pc; |
| 769 | } |
| 770 | |
| 771 | /* Function: xstormy16_init_extra_frame_info |
| 772 | This is the constructor function for the frame_info struct, |
| 773 | called whenever a new frame_info is created (from create_new_frame, |
| 774 | and from get_prev_frame). |
| 775 | */ |
| 776 | |
| 777 | static void |
| 778 | xstormy16_init_extra_frame_info (int fromleaf, struct frame_info *fi) |
| 779 | { |
| 780 | if (!fi->extra_info) |
| 781 | { |
| 782 | fi->extra_info = (struct frame_extra_info *) |
| 783 | frame_obstack_alloc (sizeof (struct frame_extra_info)); |
| 784 | fi->extra_info->framesize = 0; |
| 785 | fi->extra_info->frameless_p = 1; /* Default frameless, detect framed */ |
| 786 | |
| 787 | /* By default, the fi->frame is set to the value of the FP reg by gdb. |
| 788 | This may not always be right; we may be in a frameless function, |
| 789 | or we may be in the prologue, before the FP has been set up. |
| 790 | Unfortunately, we can't make this determination without first |
| 791 | calling scan_prologue, and we can't do that unles we know the |
| 792 | fi->pc. */ |
| 793 | |
| 794 | if (!fi->pc) |
| 795 | { |
| 796 | /* Sometimes we are called from get_prev_frame without |
| 797 | the PC being set up first. Long history, don't ask. |
| 798 | Fortunately this will never happen from the outermost |
| 799 | frame, so we should be able to get the saved pc from |
| 800 | the next frame. */ |
| 801 | if (fi->next) |
| 802 | fi->pc = xstormy16_frame_saved_pc (fi->next); |
| 803 | } |
| 804 | |
| 805 | /* Take care of the saved_regs right here (non-lazy). */ |
| 806 | xstormy16_frame_init_saved_regs (fi); |
| 807 | } |
| 808 | } |
| 809 | |
| 810 | /* Function: xstormy16_frame_chain |
| 811 | Returns a pointer to the stack frame of the calling function. |
| 812 | Called only from get_prev_frame. Needed for backtrace, "up", etc. |
| 813 | */ |
| 814 | |
| 815 | static CORE_ADDR |
| 816 | xstormy16_frame_chain (struct frame_info *fi) |
| 817 | { |
| 818 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
| 819 | { |
| 820 | /* Call dummy's frame is the same as caller's. */ |
| 821 | return fi->frame; |
| 822 | } |
| 823 | else |
| 824 | { |
| 825 | /* Return computed offset from this frame's fp. */ |
| 826 | return fi->frame - fi->extra_info->framesize; |
| 827 | } |
| 828 | } |
| 829 | |
| 830 | static int |
| 831 | xstormy16_frame_chain_valid (CORE_ADDR chain, struct frame_info *thisframe) |
| 832 | { |
| 833 | return chain < 0x8000 && FRAME_SAVED_PC (thisframe) >= 0x8000 && |
| 834 | (thisframe->extra_info->frameless_p || |
| 835 | thisframe->frame - thisframe->extra_info->framesize == chain); |
| 836 | } |
| 837 | |
| 838 | /* Function: xstormy16_saved_pc_after_call |
| 839 | Returns the previous PC immediately after a function call. |
| 840 | This function is meant to bypass the regular get_saved_register |
| 841 | mechanism, ie. it is meant to work even if the frame isn't complete. |
| 842 | Called by step_over_function, and sometimes by get_prev_frame. |
| 843 | */ |
| 844 | |
| 845 | static CORE_ADDR |
| 846 | xstormy16_saved_pc_after_call (struct frame_info *ignore) |
| 847 | { |
| 848 | CORE_ADDR sp, pc, tmp; |
| 849 | |
| 850 | sp = read_register (E_SP_REGNUM) - xstormy16_pc_size; |
| 851 | pc = read_memory_integer (sp, xstormy16_pc_size); |
| 852 | |
| 853 | /* Skip over jump table entry if necessary. */ |
| 854 | if ((tmp = SKIP_TRAMPOLINE_CODE (pc))) |
| 855 | pc = tmp; |
| 856 | |
| 857 | return pc; |
| 858 | } |
| 859 | |
| 860 | static unsigned char * |
| 861 | xstormy16_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
| 862 | { |
| 863 | static unsigned char breakpoint[] = { 0x06, 0x0 }; |
| 864 | *lenptr = sizeof (breakpoint); |
| 865 | return breakpoint; |
| 866 | } |
| 867 | |
| 868 | /* Given a pointer to a jump table entry, return the address |
| 869 | of the function it jumps to. Return 0 if not found. */ |
| 870 | static CORE_ADDR |
| 871 | xstormy16_resolve_jmp_table_entry (CORE_ADDR faddr) |
| 872 | { |
| 873 | struct obj_section *faddr_sect = find_pc_section (faddr); |
| 874 | |
| 875 | if (faddr_sect) |
| 876 | { |
| 877 | LONGEST inst, inst2, addr; |
| 878 | char buf[2 * xstormy16_inst_size]; |
| 879 | |
| 880 | /* Return faddr if it's not pointing into the jump table. */ |
| 881 | if (strcmp (faddr_sect->the_bfd_section->name, ".plt")) |
| 882 | return faddr; |
| 883 | |
| 884 | if (!target_read_memory (faddr, buf, sizeof buf)) |
| 885 | { |
| 886 | inst = extract_unsigned_integer (buf, xstormy16_inst_size); |
| 887 | inst2 = extract_unsigned_integer (buf + xstormy16_inst_size, |
| 888 | xstormy16_inst_size); |
| 889 | addr = inst2 << 8 | (inst & 0xff); |
| 890 | return addr; |
| 891 | } |
| 892 | } |
| 893 | return 0; |
| 894 | } |
| 895 | |
| 896 | /* Given a function's address, attempt to find (and return) the |
| 897 | address of the corresponding jump table entry. Return 0 if |
| 898 | not found. */ |
| 899 | static CORE_ADDR |
| 900 | xstormy16_find_jmp_table_entry (CORE_ADDR faddr) |
| 901 | { |
| 902 | struct obj_section *faddr_sect = find_pc_section (faddr); |
| 903 | |
| 904 | if (faddr_sect) |
| 905 | { |
| 906 | struct obj_section *osect; |
| 907 | |
| 908 | /* Return faddr if it's already a pointer to a jump table entry. */ |
| 909 | if (!strcmp (faddr_sect->the_bfd_section->name, ".plt")) |
| 910 | return faddr; |
| 911 | |
| 912 | ALL_OBJFILE_OSECTIONS (faddr_sect->objfile, osect) |
| 913 | { |
| 914 | if (!strcmp (osect->the_bfd_section->name, ".plt")) |
| 915 | break; |
| 916 | } |
| 917 | |
| 918 | if (osect < faddr_sect->objfile->sections_end) |
| 919 | { |
| 920 | CORE_ADDR addr; |
| 921 | for (addr = osect->addr; |
| 922 | addr < osect->endaddr; addr += 2 * xstormy16_inst_size) |
| 923 | { |
| 924 | int status; |
| 925 | LONGEST inst, inst2, faddr2; |
| 926 | char buf[2 * xstormy16_inst_size]; |
| 927 | |
| 928 | if (target_read_memory (addr, buf, sizeof buf)) |
| 929 | return 0; |
| 930 | inst = extract_unsigned_integer (buf, xstormy16_inst_size); |
| 931 | inst2 = extract_unsigned_integer (buf + xstormy16_inst_size, |
| 932 | xstormy16_inst_size); |
| 933 | faddr2 = inst2 << 8 | (inst & 0xff); |
| 934 | if (faddr == faddr2) |
| 935 | return addr; |
| 936 | } |
| 937 | } |
| 938 | } |
| 939 | return 0; |
| 940 | } |
| 941 | |
| 942 | static CORE_ADDR |
| 943 | xstormy16_skip_trampoline_code (CORE_ADDR pc) |
| 944 | { |
| 945 | int tmp = xstormy16_resolve_jmp_table_entry (pc); |
| 946 | |
| 947 | if (tmp && tmp != pc) |
| 948 | return tmp; |
| 949 | return 0; |
| 950 | } |
| 951 | |
| 952 | static int |
| 953 | xstormy16_in_solib_call_trampoline (CORE_ADDR pc, char *name) |
| 954 | { |
| 955 | return xstormy16_skip_trampoline_code (pc) != 0; |
| 956 | } |
| 957 | |
| 958 | static CORE_ADDR |
| 959 | xstormy16_pointer_to_address (struct type *type, void *buf) |
| 960 | { |
| 961 | enum type_code target = TYPE_CODE (TYPE_TARGET_TYPE (type)); |
| 962 | CORE_ADDR addr = extract_address (buf, TYPE_LENGTH (type)); |
| 963 | |
| 964 | if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD) |
| 965 | { |
| 966 | CORE_ADDR addr2 = xstormy16_resolve_jmp_table_entry (addr); |
| 967 | if (addr2) |
| 968 | addr = addr2; |
| 969 | } |
| 970 | |
| 971 | return addr; |
| 972 | } |
| 973 | |
| 974 | static void |
| 975 | xstormy16_address_to_pointer (struct type *type, void *buf, CORE_ADDR addr) |
| 976 | { |
| 977 | enum type_code target = TYPE_CODE (TYPE_TARGET_TYPE (type)); |
| 978 | |
| 979 | if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD) |
| 980 | { |
| 981 | CORE_ADDR addr2 = xstormy16_find_jmp_table_entry (addr); |
| 982 | if (addr2) |
| 983 | addr = addr2; |
| 984 | } |
| 985 | store_address (buf, TYPE_LENGTH (type), addr); |
| 986 | } |
| 987 | |
| 988 | static CORE_ADDR |
| 989 | xstormy16_stack_align (CORE_ADDR addr) |
| 990 | { |
| 991 | if (addr & 1) |
| 992 | ++addr; |
| 993 | return addr; |
| 994 | } |
| 995 | |
| 996 | void |
| 997 | xstormy16_save_dummy_frame_tos (CORE_ADDR sp) |
| 998 | { |
| 999 | generic_save_dummy_frame_tos (sp - xstormy16_pc_size); |
| 1000 | } |
| 1001 | |
| 1002 | /* Function: xstormy16_gdbarch_init |
| 1003 | Initializer function for the xstormy16 gdbarch vector. |
| 1004 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ |
| 1005 | |
| 1006 | static struct gdbarch * |
| 1007 | xstormy16_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 1008 | { |
| 1009 | static LONGEST call_dummy_words[1] = { 0 }; |
| 1010 | struct gdbarch_tdep *tdep = NULL; |
| 1011 | struct gdbarch *gdbarch; |
| 1012 | |
| 1013 | /* find a candidate among the list of pre-declared architectures. */ |
| 1014 | arches = gdbarch_list_lookup_by_info (arches, &info); |
| 1015 | if (arches != NULL) |
| 1016 | return (arches->gdbarch); |
| 1017 | |
| 1018 | #if 0 |
| 1019 | tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep)); |
| 1020 | #endif |
| 1021 | |
| 1022 | gdbarch = gdbarch_alloc (&info, 0); |
| 1023 | |
| 1024 | /* |
| 1025 | * Basic register fields and methods. |
| 1026 | */ |
| 1027 | |
| 1028 | set_gdbarch_num_regs (gdbarch, E_NUM_REGS); |
| 1029 | set_gdbarch_num_pseudo_regs (gdbarch, 0); |
| 1030 | set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM); |
| 1031 | set_gdbarch_fp_regnum (gdbarch, E_FP_REGNUM); |
| 1032 | set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM); |
| 1033 | set_gdbarch_register_name (gdbarch, xstormy16_register_name); |
| 1034 | set_gdbarch_register_size (gdbarch, xstormy16_reg_size); |
| 1035 | set_gdbarch_register_bytes (gdbarch, E_ALL_REGS_SIZE); |
| 1036 | set_gdbarch_register_byte (gdbarch, xstormy16_register_byte); |
| 1037 | set_gdbarch_register_raw_size (gdbarch, xstormy16_register_raw_size); |
| 1038 | set_gdbarch_max_register_raw_size (gdbarch, xstormy16_pc_size); |
| 1039 | set_gdbarch_register_virtual_size (gdbarch, xstormy16_register_raw_size); |
| 1040 | set_gdbarch_max_register_virtual_size (gdbarch, 4); |
| 1041 | set_gdbarch_register_virtual_type (gdbarch, xstormy16_reg_virtual_type); |
| 1042 | |
| 1043 | /* |
| 1044 | * Frame Info |
| 1045 | */ |
| 1046 | set_gdbarch_init_extra_frame_info (gdbarch, |
| 1047 | xstormy16_init_extra_frame_info); |
| 1048 | set_gdbarch_frame_init_saved_regs (gdbarch, |
| 1049 | xstormy16_frame_init_saved_regs); |
| 1050 | set_gdbarch_frame_chain (gdbarch, xstormy16_frame_chain); |
| 1051 | set_gdbarch_get_saved_register (gdbarch, xstormy16_get_saved_register); |
| 1052 | set_gdbarch_saved_pc_after_call (gdbarch, xstormy16_saved_pc_after_call); |
| 1053 | set_gdbarch_frame_saved_pc (gdbarch, xstormy16_frame_saved_pc); |
| 1054 | set_gdbarch_skip_prologue (gdbarch, xstormy16_skip_prologue); |
| 1055 | set_gdbarch_frame_chain_valid (gdbarch, xstormy16_frame_chain_valid); |
| 1056 | set_gdbarch_frame_args_address (gdbarch, default_frame_address); |
| 1057 | set_gdbarch_frame_locals_address (gdbarch, default_frame_address); |
| 1058 | |
| 1059 | set_gdbarch_in_function_epilogue_p (gdbarch, |
| 1060 | xstormy16_in_function_epilogue_p); |
| 1061 | |
| 1062 | /* |
| 1063 | * Miscelany |
| 1064 | */ |
| 1065 | /* Stack grows up. */ |
| 1066 | set_gdbarch_inner_than (gdbarch, core_addr_greaterthan); |
| 1067 | /* PC stops zero byte after a trap instruction |
| 1068 | (which means: exactly on trap instruction). */ |
| 1069 | set_gdbarch_decr_pc_after_break (gdbarch, 0); |
| 1070 | /* This value is almost never non-zero... */ |
| 1071 | set_gdbarch_function_start_offset (gdbarch, 0); |
| 1072 | /* This value is almost never non-zero... */ |
| 1073 | set_gdbarch_frame_args_skip (gdbarch, 0); |
| 1074 | /* OK to default this value to 'unknown'. */ |
| 1075 | set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown); |
| 1076 | |
| 1077 | /* W/o prototype, coerce float args to double. */ |
| 1078 | set_gdbarch_coerce_float_to_double (gdbarch, |
| 1079 | standard_coerce_float_to_double); |
| 1080 | |
| 1081 | /* |
| 1082 | * Call Dummies |
| 1083 | * |
| 1084 | * These values and methods are used when gdb calls a target function. */ |
| 1085 | set_gdbarch_use_generic_dummy_frames (gdbarch, 1); |
| 1086 | set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame); |
| 1087 | set_gdbarch_push_return_address (gdbarch, xstormy16_push_return_address); |
| 1088 | set_gdbarch_extract_return_value (gdbarch, xstormy16_extract_return_value); |
| 1089 | set_gdbarch_push_arguments (gdbarch, xstormy16_push_arguments); |
| 1090 | set_gdbarch_pop_frame (gdbarch, xstormy16_pop_frame); |
| 1091 | set_gdbarch_store_struct_return (gdbarch, xstormy16_store_struct_return); |
| 1092 | set_gdbarch_store_return_value (gdbarch, xstormy16_store_return_value); |
| 1093 | set_gdbarch_extract_struct_value_address (gdbarch, |
| 1094 | xstormy16_extract_struct_value_address); |
| 1095 | set_gdbarch_use_struct_convention (gdbarch, |
| 1096 | xstormy16_use_struct_convention); |
| 1097 | set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT); |
| 1098 | set_gdbarch_call_dummy_address (gdbarch, entry_point_address); |
| 1099 | set_gdbarch_call_dummy_start_offset (gdbarch, 0); |
| 1100 | set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0); |
| 1101 | set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); |
| 1102 | set_gdbarch_call_dummy_length (gdbarch, 0); |
| 1103 | set_gdbarch_pc_in_call_dummy (gdbarch, generic_pc_in_call_dummy); |
| 1104 | set_gdbarch_call_dummy_p (gdbarch, 1); |
| 1105 | set_gdbarch_call_dummy_words (gdbarch, call_dummy_words); |
| 1106 | set_gdbarch_sizeof_call_dummy_words (gdbarch, 0); |
| 1107 | set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); |
| 1108 | /* set_gdbarch_call_dummy_stack_adjust */ |
| 1109 | set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy); |
| 1110 | set_gdbarch_breakpoint_from_pc (gdbarch, xstormy16_breakpoint_from_pc); |
| 1111 | |
| 1112 | set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| 1113 | set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| 1114 | set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| 1115 | set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); |
| 1116 | |
| 1117 | set_gdbarch_address_to_pointer (gdbarch, xstormy16_address_to_pointer); |
| 1118 | set_gdbarch_pointer_to_address (gdbarch, xstormy16_pointer_to_address); |
| 1119 | |
| 1120 | set_gdbarch_stack_align (gdbarch, xstormy16_stack_align); |
| 1121 | set_gdbarch_extra_stack_alignment_needed (gdbarch, 0); |
| 1122 | |
| 1123 | set_gdbarch_save_dummy_frame_tos (gdbarch, xstormy16_save_dummy_frame_tos); |
| 1124 | |
| 1125 | set_gdbarch_skip_trampoline_code (gdbarch, xstormy16_skip_trampoline_code); |
| 1126 | |
| 1127 | set_gdbarch_in_solib_call_trampoline (gdbarch, |
| 1128 | xstormy16_in_solib_call_trampoline); |
| 1129 | |
| 1130 | return gdbarch; |
| 1131 | } |
| 1132 | |
| 1133 | /* Function: _initialize_xstormy16_tdep |
| 1134 | Initializer function for the Sanyo Xstormy16a module. |
| 1135 | Called by gdb at start-up. */ |
| 1136 | |
| 1137 | void |
| 1138 | _initialize_xstormy16_tdep (void) |
| 1139 | { |
| 1140 | extern int print_insn_xstormy16 (); |
| 1141 | |
| 1142 | register_gdbarch_init (bfd_arch_xstormy16, xstormy16_gdbarch_init); |
| 1143 | tm_print_insn = print_insn_xstormy16; |
| 1144 | } |