| 1 | /* Target-dependent code for the CSKY architecture, for GDB. |
| 2 | |
| 3 | Copyright (C) 2010-2020 Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by C-SKY Microsystems and Mentor Graphics. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "gdbsupport/gdb_assert.h" |
| 24 | #include "frame.h" |
| 25 | #include "inferior.h" |
| 26 | #include "symtab.h" |
| 27 | #include "value.h" |
| 28 | #include "gdbcmd.h" |
| 29 | #include "language.h" |
| 30 | #include "gdbcore.h" |
| 31 | #include "symfile.h" |
| 32 | #include "objfiles.h" |
| 33 | #include "gdbtypes.h" |
| 34 | #include "target.h" |
| 35 | #include "arch-utils.h" |
| 36 | #include "regcache.h" |
| 37 | #include "osabi.h" |
| 38 | #include "block.h" |
| 39 | #include "reggroups.h" |
| 40 | #include "elf/csky.h" |
| 41 | #include "elf-bfd.h" |
| 42 | #include "symcat.h" |
| 43 | #include "sim-regno.h" |
| 44 | #include "dis-asm.h" |
| 45 | #include "frame-unwind.h" |
| 46 | #include "frame-base.h" |
| 47 | #include "trad-frame.h" |
| 48 | #include "infcall.h" |
| 49 | #include "floatformat.h" |
| 50 | #include "remote.h" |
| 51 | #include "target-descriptions.h" |
| 52 | #include "dwarf2-frame.h" |
| 53 | #include "user-regs.h" |
| 54 | #include "valprint.h" |
| 55 | #include "csky-tdep.h" |
| 56 | #include "regset.h" |
| 57 | #include "opcode/csky.h" |
| 58 | #include <algorithm> |
| 59 | #include <vector> |
| 60 | |
| 61 | /* Control debugging information emitted in this file. */ |
| 62 | static bool csky_debug = false; |
| 63 | |
| 64 | static struct reggroup *cr_reggroup; |
| 65 | static struct reggroup *fr_reggroup; |
| 66 | static struct reggroup *vr_reggroup; |
| 67 | static struct reggroup *mmu_reggroup; |
| 68 | static struct reggroup *prof_reggroup; |
| 69 | |
| 70 | /* Convenience function to print debug messages in prologue analysis. */ |
| 71 | |
| 72 | static void |
| 73 | print_savedreg_msg (int regno, int offsets[], bool print_continuing) |
| 74 | { |
| 75 | fprintf_unfiltered (gdb_stdlog, "csky: r%d saved at offset 0x%x\n", |
| 76 | regno, offsets[regno]); |
| 77 | if (print_continuing) |
| 78 | fprintf_unfiltered (gdb_stdlog, "csky: continuing\n"); |
| 79 | } |
| 80 | |
| 81 | /* Check whether the instruction at ADDR is 16-bit or not. */ |
| 82 | |
| 83 | static int |
| 84 | csky_pc_is_csky16 (struct gdbarch *gdbarch, CORE_ADDR addr) |
| 85 | { |
| 86 | gdb_byte target_mem[2]; |
| 87 | int status; |
| 88 | unsigned int insn; |
| 89 | int ret = 1; |
| 90 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 91 | |
| 92 | status = target_read_memory (addr, target_mem, 2); |
| 93 | /* Assume a 16-bit instruction if we can't read memory. */ |
| 94 | if (status) |
| 95 | return 1; |
| 96 | |
| 97 | /* Get instruction from memory. */ |
| 98 | insn = extract_unsigned_integer (target_mem, 2, byte_order); |
| 99 | if ((insn & CSKY_32_INSN_MASK) == CSKY_32_INSN_MASK) |
| 100 | ret = 0; |
| 101 | else if (insn == CSKY_BKPT_INSN) |
| 102 | { |
| 103 | /* Check for 32-bit bkpt instruction which is all 0. */ |
| 104 | status = target_read_memory (addr + 2, target_mem, 2); |
| 105 | if (status) |
| 106 | return 1; |
| 107 | |
| 108 | insn = extract_unsigned_integer (target_mem, 2, byte_order); |
| 109 | if (insn == CSKY_BKPT_INSN) |
| 110 | ret = 0; |
| 111 | } |
| 112 | return ret; |
| 113 | } |
| 114 | |
| 115 | /* Get one instruction at ADDR and store it in INSN. Return 2 for |
| 116 | a 16-bit instruction or 4 for a 32-bit instruction. */ |
| 117 | |
| 118 | static int |
| 119 | csky_get_insn (struct gdbarch *gdbarch, CORE_ADDR addr, unsigned int *insn) |
| 120 | { |
| 121 | gdb_byte target_mem[2]; |
| 122 | unsigned int insn_type; |
| 123 | int status; |
| 124 | int insn_len = 2; |
| 125 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 126 | |
| 127 | status = target_read_memory (addr, target_mem, 2); |
| 128 | if (status) |
| 129 | memory_error (TARGET_XFER_E_IO, addr); |
| 130 | |
| 131 | insn_type = extract_unsigned_integer (target_mem, 2, byte_order); |
| 132 | if (CSKY_32_INSN_MASK == (insn_type & CSKY_32_INSN_MASK)) |
| 133 | { |
| 134 | status = target_read_memory (addr + 2, target_mem, 2); |
| 135 | if (status) |
| 136 | memory_error (TARGET_XFER_E_IO, addr); |
| 137 | insn_type = ((insn_type << 16) |
| 138 | | extract_unsigned_integer (target_mem, 2, byte_order)); |
| 139 | insn_len = 4; |
| 140 | } |
| 141 | *insn = insn_type; |
| 142 | return insn_len; |
| 143 | } |
| 144 | |
| 145 | /* Implement the read_pc gdbarch method. */ |
| 146 | |
| 147 | static CORE_ADDR |
| 148 | csky_read_pc (readable_regcache *regcache) |
| 149 | { |
| 150 | ULONGEST pc; |
| 151 | regcache->cooked_read (CSKY_PC_REGNUM, &pc); |
| 152 | return pc; |
| 153 | } |
| 154 | |
| 155 | /* Implement the write_pc gdbarch method. */ |
| 156 | |
| 157 | static void |
| 158 | csky_write_pc (regcache *regcache, CORE_ADDR val) |
| 159 | { |
| 160 | regcache_cooked_write_unsigned (regcache, CSKY_PC_REGNUM, val); |
| 161 | } |
| 162 | |
| 163 | /* C-Sky ABI register names. */ |
| 164 | |
| 165 | static const char *csky_register_names[] = |
| 166 | { |
| 167 | /* General registers 0 - 31. */ |
| 168 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| 169 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", |
| 170 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", |
| 171 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", |
| 172 | |
| 173 | /* DSP hilo registers 36 and 37. */ |
| 174 | "", "", "", "", "hi", "lo", "", "", |
| 175 | |
| 176 | /* FPU/VPU general registers 40 - 71. */ |
| 177 | "fr0", "fr1", "fr2", "fr3", "fr4", "fr5", "fr6", "fr7", |
| 178 | "fr8", "fr9", "fr10", "fr11", "fr12", "fr13", "fr14", "fr15", |
| 179 | "vr0", "vr1", "vr2", "vr3", "vr4", "vr5", "vr6", "vr7", |
| 180 | "vr8", "vr9", "vr10", "vr11", "vr12", "vr13", "vr14", "vr15", |
| 181 | |
| 182 | /* Program counter 72. */ |
| 183 | "pc", |
| 184 | |
| 185 | /* Optional registers (ar) 73 - 88. */ |
| 186 | "ar0", "ar1", "ar2", "ar3", "ar4", "ar5", "ar6", "ar7", |
| 187 | "ar8", "ar9", "ar10", "ar11", "ar12", "ar13", "ar14", "ar15", |
| 188 | |
| 189 | /* Control registers (cr) 89 - 119. */ |
| 190 | "psr", "vbr", "epsr", "fpsr", "epc", "fpc", "ss0", "ss1", |
| 191 | "ss2", "ss3", "ss4", "gcr", "gsr", "cr13", "cr14", "cr15", |
| 192 | "cr16", "cr17", "cr18", "cr19", "cr20", "cr21", "cr22", "cr23", |
| 193 | "cr24", "cr25", "cr26", "cr27", "cr28", "cr29", "cr30", "cr31", |
| 194 | |
| 195 | /* FPU/VPU control registers 121 ~ 123. */ |
| 196 | /* User sp 127. */ |
| 197 | "fid", "fcr", "fesr", "", "", "", "usp", |
| 198 | |
| 199 | /* MMU control registers: 128 - 136. */ |
| 200 | "mcr0", "mcr2", "mcr3", "mcr4", "mcr6", "mcr8", "mcr29", "mcr30", |
| 201 | "mcr31", "", "", "", |
| 202 | |
| 203 | /* Profiling control registers 140 - 143. */ |
| 204 | /* Profiling software general registers 144 - 157. */ |
| 205 | "profcr0", "profcr1", "profcr2", "profcr3", "profsgr0", "profsgr1", |
| 206 | "profsgr2", "profsgr3", "profsgr4", "profsgr5", "profsgr6", "profsgr7", |
| 207 | "profsgr8", "profsgr9", "profsgr10","profsgr11","profsgr12", "profsgr13", |
| 208 | "", "", |
| 209 | |
| 210 | /* Profiling architecture general registers 160 - 174. */ |
| 211 | "profagr0", "profagr1", "profagr2", "profagr3", "profagr4", "profagr5", |
| 212 | "profagr6", "profagr7", "profagr8", "profagr9", "profagr10","profagr11", |
| 213 | "profagr12","profagr13","profagr14", "", |
| 214 | |
| 215 | /* Profiling extension general registers 176 - 188. */ |
| 216 | "profxgr0", "profxgr1", "profxgr2", "profxgr3", "profxgr4", "profxgr5", |
| 217 | "profxgr6", "profxgr7", "profxgr8", "profxgr9", "profxgr10","profxgr11", |
| 218 | "profxgr12", |
| 219 | |
| 220 | /* Control registers in bank1. */ |
| 221 | "", "", "", "", "", "", "", "", |
| 222 | "", "", "", "", "", "", "", "", |
| 223 | "cp1cr16", "cp1cr17", "cp1cr18", "cp1cr19", "cp1cr20", "", "", "", |
| 224 | "", "", "", "", "", "", "", "", |
| 225 | |
| 226 | /* Control registers in bank3 (ICE). */ |
| 227 | "sepsr", "sevbr", "seepsr", "", "seepc", "", "nsssp", "seusp", |
| 228 | "sedcr", "", "", "", "", "", "", "", |
| 229 | "", "", "", "", "", "", "", "", |
| 230 | "", "", "", "", "", "", "", "" |
| 231 | }; |
| 232 | |
| 233 | /* Implement the register_name gdbarch method. */ |
| 234 | |
| 235 | static const char * |
| 236 | csky_register_name (struct gdbarch *gdbarch, int reg_nr) |
| 237 | { |
| 238 | if (tdesc_has_registers (gdbarch_target_desc (gdbarch))) |
| 239 | return tdesc_register_name (gdbarch, reg_nr); |
| 240 | |
| 241 | if (reg_nr < 0) |
| 242 | return NULL; |
| 243 | |
| 244 | if (reg_nr >= gdbarch_num_regs (gdbarch)) |
| 245 | return NULL; |
| 246 | |
| 247 | return csky_register_names[reg_nr]; |
| 248 | } |
| 249 | |
| 250 | /* Construct vector type for vrx registers. */ |
| 251 | |
| 252 | static struct type * |
| 253 | csky_vector_type (struct gdbarch *gdbarch) |
| 254 | { |
| 255 | const struct builtin_type *bt = builtin_type (gdbarch); |
| 256 | |
| 257 | struct type *t; |
| 258 | |
| 259 | t = arch_composite_type (gdbarch, "__gdb_builtin_type_vec128i", |
| 260 | TYPE_CODE_UNION); |
| 261 | |
| 262 | append_composite_type_field (t, "u32", |
| 263 | init_vector_type (bt->builtin_int32, 4)); |
| 264 | append_composite_type_field (t, "u16", |
| 265 | init_vector_type (bt->builtin_int16, 8)); |
| 266 | append_composite_type_field (t, "u8", |
| 267 | init_vector_type (bt->builtin_int8, 16)); |
| 268 | |
| 269 | TYPE_VECTOR (t) = 1; |
| 270 | TYPE_NAME (t) = "builtin_type_vec128i"; |
| 271 | |
| 272 | return t; |
| 273 | } |
| 274 | |
| 275 | /* Return the GDB type object for the "standard" data type |
| 276 | of data in register N. */ |
| 277 | |
| 278 | static struct type * |
| 279 | csky_register_type (struct gdbarch *gdbarch, int reg_nr) |
| 280 | { |
| 281 | /* PC, EPC, FPC is a text pointer. */ |
| 282 | if ((reg_nr == CSKY_PC_REGNUM) || (reg_nr == CSKY_EPC_REGNUM) |
| 283 | || (reg_nr == CSKY_FPC_REGNUM)) |
| 284 | return builtin_type (gdbarch)->builtin_func_ptr; |
| 285 | |
| 286 | /* VBR is a data pointer. */ |
| 287 | if (reg_nr == CSKY_VBR_REGNUM) |
| 288 | return builtin_type (gdbarch)->builtin_data_ptr; |
| 289 | |
| 290 | /* Float register has 64 bits, and only in ck810. */ |
| 291 | if ((reg_nr >=CSKY_FR0_REGNUM) && (reg_nr <= CSKY_FR0_REGNUM + 15)) |
| 292 | return arch_float_type (gdbarch, 64, "builtin_type_csky_ext", |
| 293 | floatformats_ieee_double); |
| 294 | |
| 295 | /* Vector register has 128 bits, and only in ck810. */ |
| 296 | if ((reg_nr >= CSKY_VR0_REGNUM) && (reg_nr <= CSKY_VR0_REGNUM + 15)) |
| 297 | return csky_vector_type (gdbarch); |
| 298 | |
| 299 | /* Profiling general register has 48 bits, we use 64bit. */ |
| 300 | if ((reg_nr >= CSKY_PROFGR_REGNUM) && (reg_nr <= CSKY_PROFGR_REGNUM + 44)) |
| 301 | return builtin_type (gdbarch)->builtin_uint64; |
| 302 | |
| 303 | if (reg_nr == CSKY_SP_REGNUM) |
| 304 | return builtin_type (gdbarch)->builtin_data_ptr; |
| 305 | |
| 306 | /* Others are 32 bits. */ |
| 307 | return builtin_type (gdbarch)->builtin_int32; |
| 308 | } |
| 309 | |
| 310 | /* Data structure to marshall items in a dummy stack frame when |
| 311 | calling a function in the inferior. */ |
| 312 | |
| 313 | struct stack_item |
| 314 | { |
| 315 | stack_item (int len_, const gdb_byte *data_) |
| 316 | : len (len_), data (data_) |
| 317 | {} |
| 318 | |
| 319 | int len; |
| 320 | const gdb_byte *data; |
| 321 | }; |
| 322 | |
| 323 | /* Implement the push_dummy_call gdbarch method. */ |
| 324 | |
| 325 | static CORE_ADDR |
| 326 | csky_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
| 327 | struct regcache *regcache, CORE_ADDR bp_addr, |
| 328 | int nargs, struct value **args, CORE_ADDR sp, |
| 329 | function_call_return_method return_method, |
| 330 | CORE_ADDR struct_addr) |
| 331 | { |
| 332 | int argnum; |
| 333 | int argreg = CSKY_ABI_A0_REGNUM; |
| 334 | int last_arg_regnum = CSKY_ABI_LAST_ARG_REGNUM; |
| 335 | int need_dummy_stack = 0; |
| 336 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 337 | std::vector<stack_item> stack_items; |
| 338 | |
| 339 | /* Set the return address. For CSKY, the return breakpoint is |
| 340 | always at BP_ADDR. */ |
| 341 | regcache_cooked_write_unsigned (regcache, CSKY_LR_REGNUM, bp_addr); |
| 342 | |
| 343 | /* The struct_return pointer occupies the first parameter |
| 344 | passing register. */ |
| 345 | if (return_method == return_method_struct) |
| 346 | { |
| 347 | if (csky_debug) |
| 348 | { |
| 349 | fprintf_unfiltered (gdb_stdlog, |
| 350 | "csky: struct return in %s = %s\n", |
| 351 | gdbarch_register_name (gdbarch, argreg), |
| 352 | paddress (gdbarch, struct_addr)); |
| 353 | } |
| 354 | regcache_cooked_write_unsigned (regcache, argreg, struct_addr); |
| 355 | argreg++; |
| 356 | } |
| 357 | |
| 358 | /* Put parameters into argument registers in REGCACHE. |
| 359 | In ABI argument registers are r0 through r3. */ |
| 360 | for (argnum = 0; argnum < nargs; argnum++) |
| 361 | { |
| 362 | int len; |
| 363 | struct type *arg_type; |
| 364 | const gdb_byte *val; |
| 365 | |
| 366 | arg_type = check_typedef (value_type (args[argnum])); |
| 367 | len = TYPE_LENGTH (arg_type); |
| 368 | val = value_contents (args[argnum]); |
| 369 | |
| 370 | /* Copy the argument to argument registers or the dummy stack. |
| 371 | Large arguments are split between registers and stack. |
| 372 | |
| 373 | If len < 4, there is no need to worry about endianness since |
| 374 | the arguments will always be stored in the low address. */ |
| 375 | if (len < 4) |
| 376 | { |
| 377 | CORE_ADDR regval |
| 378 | = extract_unsigned_integer (val, len, byte_order); |
| 379 | regcache_cooked_write_unsigned (regcache, argreg, regval); |
| 380 | argreg++; |
| 381 | } |
| 382 | else |
| 383 | { |
| 384 | while (len > 0) |
| 385 | { |
| 386 | int partial_len = len < 4 ? len : 4; |
| 387 | if (argreg <= last_arg_regnum) |
| 388 | { |
| 389 | /* The argument is passed in an argument register. */ |
| 390 | CORE_ADDR regval |
| 391 | = extract_unsigned_integer (val, partial_len, |
| 392 | byte_order); |
| 393 | if (byte_order == BFD_ENDIAN_BIG) |
| 394 | regval <<= (4 - partial_len) * 8; |
| 395 | |
| 396 | /* Put regval into register in REGCACHE. */ |
| 397 | regcache_cooked_write_unsigned (regcache, argreg, |
| 398 | regval); |
| 399 | argreg++; |
| 400 | } |
| 401 | else |
| 402 | { |
| 403 | /* The argument should be pushed onto the dummy stack. */ |
| 404 | stack_items.emplace_back (4, val); |
| 405 | need_dummy_stack += 4; |
| 406 | } |
| 407 | len -= partial_len; |
| 408 | val += partial_len; |
| 409 | } |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | /* Transfer the dummy stack frame to the target. */ |
| 414 | std::vector<stack_item>::reverse_iterator iter; |
| 415 | for (iter = stack_items.rbegin (); iter != stack_items.rend (); ++iter) |
| 416 | { |
| 417 | sp -= iter->len; |
| 418 | write_memory (sp, iter->data, iter->len); |
| 419 | } |
| 420 | |
| 421 | /* Finally, update the SP register. */ |
| 422 | regcache_cooked_write_unsigned (regcache, CSKY_SP_REGNUM, sp); |
| 423 | return sp; |
| 424 | } |
| 425 | |
| 426 | /* Implement the return_value gdbarch method. */ |
| 427 | |
| 428 | static enum return_value_convention |
| 429 | csky_return_value (struct gdbarch *gdbarch, struct value *function, |
| 430 | struct type *valtype, struct regcache *regcache, |
| 431 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 432 | { |
| 433 | CORE_ADDR regval; |
| 434 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 435 | int len = TYPE_LENGTH (valtype); |
| 436 | unsigned int ret_regnum = CSKY_RET_REGNUM; |
| 437 | |
| 438 | /* Csky abi specifies that return values larger than 8 bytes |
| 439 | are put on the stack. */ |
| 440 | if (len > 8) |
| 441 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 442 | else |
| 443 | { |
| 444 | if (readbuf != NULL) |
| 445 | { |
| 446 | ULONGEST tmp; |
| 447 | /* By using store_unsigned_integer we avoid having to do |
| 448 | anything special for small big-endian values. */ |
| 449 | regcache->cooked_read (ret_regnum, &tmp); |
| 450 | store_unsigned_integer (readbuf, (len > 4 ? 4 : len), |
| 451 | byte_order, tmp); |
| 452 | if (len > 4) |
| 453 | { |
| 454 | regcache->cooked_read (ret_regnum + 1, &tmp); |
| 455 | store_unsigned_integer (readbuf + 4, 4, byte_order, tmp); |
| 456 | } |
| 457 | } |
| 458 | if (writebuf != NULL) |
| 459 | { |
| 460 | regval = extract_unsigned_integer (writebuf, len > 4 ? 4 : len, |
| 461 | byte_order); |
| 462 | regcache_cooked_write_unsigned (regcache, ret_regnum, regval); |
| 463 | if (len > 4) |
| 464 | { |
| 465 | regval = extract_unsigned_integer ((gdb_byte *) writebuf + 4, |
| 466 | 4, byte_order); |
| 467 | regcache_cooked_write_unsigned (regcache, ret_regnum + 1, |
| 468 | regval); |
| 469 | } |
| 470 | |
| 471 | } |
| 472 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | /* Implement the frame_align gdbarch method. |
| 477 | |
| 478 | Adjust the address downward (direction of stack growth) so that it |
| 479 | is correctly aligned for a new stack frame. */ |
| 480 | |
| 481 | static CORE_ADDR |
| 482 | csky_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr) |
| 483 | { |
| 484 | return align_down (addr, 4); |
| 485 | } |
| 486 | |
| 487 | /* Unwind cache used for gdbarch fallback unwinder. */ |
| 488 | |
| 489 | struct csky_unwind_cache |
| 490 | { |
| 491 | /* The stack pointer at the time this frame was created; i.e. the |
| 492 | caller's stack pointer when this function was called. It is used |
| 493 | to identify this frame. */ |
| 494 | CORE_ADDR prev_sp; |
| 495 | |
| 496 | /* The frame base for this frame is just prev_sp - frame size. |
| 497 | FRAMESIZE is the distance from the frame pointer to the |
| 498 | initial stack pointer. */ |
| 499 | int framesize; |
| 500 | |
| 501 | /* The register used to hold the frame pointer for this frame. */ |
| 502 | int framereg; |
| 503 | |
| 504 | /* Saved register offsets. */ |
| 505 | struct trad_frame_saved_reg *saved_regs; |
| 506 | }; |
| 507 | |
| 508 | /* Do prologue analysis, returning the PC of the first instruction |
| 509 | after the function prologue. */ |
| 510 | |
| 511 | static CORE_ADDR |
| 512 | csky_analyze_prologue (struct gdbarch *gdbarch, |
| 513 | CORE_ADDR start_pc, |
| 514 | CORE_ADDR limit_pc, |
| 515 | CORE_ADDR end_pc, |
| 516 | struct frame_info *this_frame, |
| 517 | struct csky_unwind_cache *this_cache, |
| 518 | lr_type_t lr_type) |
| 519 | { |
| 520 | CORE_ADDR addr; |
| 521 | unsigned int insn, rn; |
| 522 | int framesize = 0; |
| 523 | int stacksize = 0; |
| 524 | int register_offsets[CSKY_NUM_GREGS_SAVED_GREGS]; |
| 525 | int insn_len; |
| 526 | /* For adjusting fp. */ |
| 527 | int is_fp_saved = 0; |
| 528 | int adjust_fp = 0; |
| 529 | |
| 530 | /* REGISTER_OFFSETS will contain offsets from the top of the frame |
| 531 | (NOT the frame pointer) for the various saved registers, or -1 |
| 532 | if the register is not saved. */ |
| 533 | for (rn = 0; rn < CSKY_NUM_GREGS_SAVED_GREGS; rn++) |
| 534 | register_offsets[rn] = -1; |
| 535 | |
| 536 | /* Analyze the prologue. Things we determine from analyzing the |
| 537 | prologue include the size of the frame and which registers are |
| 538 | saved (and where). */ |
| 539 | if (csky_debug) |
| 540 | { |
| 541 | fprintf_unfiltered (gdb_stdlog, |
| 542 | "csky: Scanning prologue: start_pc = 0x%x," |
| 543 | "limit_pc = 0x%x\n", (unsigned int) start_pc, |
| 544 | (unsigned int) limit_pc); |
| 545 | } |
| 546 | |
| 547 | /* Default to 16 bit instruction. */ |
| 548 | insn_len = 2; |
| 549 | stacksize = 0; |
| 550 | for (addr = start_pc; addr < limit_pc; addr += insn_len) |
| 551 | { |
| 552 | /* Get next insn. */ |
| 553 | insn_len = csky_get_insn (gdbarch, addr, &insn); |
| 554 | |
| 555 | /* Check if 32 bit. */ |
| 556 | if (insn_len == 4) |
| 557 | { |
| 558 | /* subi32 sp,sp oimm12. */ |
| 559 | if (CSKY_32_IS_SUBI0 (insn)) |
| 560 | { |
| 561 | /* Got oimm12. */ |
| 562 | int offset = CSKY_32_SUBI_IMM (insn); |
| 563 | if (csky_debug) |
| 564 | { |
| 565 | fprintf_unfiltered (gdb_stdlog, |
| 566 | "csky: got subi sp,%d; continuing\n", |
| 567 | offset); |
| 568 | } |
| 569 | stacksize += offset; |
| 570 | continue; |
| 571 | } |
| 572 | /* stm32 ry-rz,(sp). */ |
| 573 | else if (CSKY_32_IS_STMx0 (insn)) |
| 574 | { |
| 575 | /* Spill register(s). */ |
| 576 | int start_register; |
| 577 | int reg_count; |
| 578 | int offset; |
| 579 | |
| 580 | /* BIG WARNING! The CKCore ABI does not restrict functions |
| 581 | to taking only one stack allocation. Therefore, when |
| 582 | we save a register, we record the offset of where it was |
| 583 | saved relative to the current stacksize. This will |
| 584 | then give an offset from the SP upon entry to our |
| 585 | function. Remember, stacksize is NOT constant until |
| 586 | we're done scanning the prologue. */ |
| 587 | start_register = CSKY_32_STM_VAL_REGNUM (insn); |
| 588 | reg_count = CSKY_32_STM_SIZE (insn); |
| 589 | if (csky_debug) |
| 590 | { |
| 591 | fprintf_unfiltered (gdb_stdlog, |
| 592 | "csky: got stm r%d-r%d,(sp)\n", |
| 593 | start_register, |
| 594 | start_register + reg_count); |
| 595 | } |
| 596 | |
| 597 | for (rn = start_register, offset = 0; |
| 598 | rn <= start_register + reg_count; |
| 599 | rn++, offset += 4) |
| 600 | { |
| 601 | register_offsets[rn] = stacksize - offset; |
| 602 | if (csky_debug) |
| 603 | { |
| 604 | fprintf_unfiltered (gdb_stdlog, |
| 605 | "csky: r%d saved at 0x%x" |
| 606 | " (offset %d)\n", |
| 607 | rn, register_offsets[rn], |
| 608 | offset); |
| 609 | } |
| 610 | } |
| 611 | if (csky_debug) |
| 612 | fprintf_unfiltered (gdb_stdlog, "csky: continuing\n"); |
| 613 | continue; |
| 614 | } |
| 615 | /* stw ry,(sp,disp). */ |
| 616 | else if (CSKY_32_IS_STWx0 (insn)) |
| 617 | { |
| 618 | /* Spill register: see note for IS_STM above. */ |
| 619 | int disp; |
| 620 | |
| 621 | rn = CSKY_32_ST_VAL_REGNUM (insn); |
| 622 | disp = CSKY_32_ST_OFFSET (insn); |
| 623 | register_offsets[rn] = stacksize - disp; |
| 624 | if (csky_debug) |
| 625 | print_savedreg_msg (rn, register_offsets, true); |
| 626 | continue; |
| 627 | } |
| 628 | else if (CSKY_32_IS_MOV_FP_SP (insn)) |
| 629 | { |
| 630 | /* SP is saved to FP reg, means code afer prologue may |
| 631 | modify SP. */ |
| 632 | is_fp_saved = 1; |
| 633 | adjust_fp = stacksize; |
| 634 | continue; |
| 635 | } |
| 636 | else if (CSKY_32_IS_MFCR_EPSR (insn)) |
| 637 | { |
| 638 | unsigned int insn2; |
| 639 | addr += 4; |
| 640 | int mfcr_regnum = insn & 0x1f; |
| 641 | insn_len = csky_get_insn (gdbarch, addr, &insn2); |
| 642 | if (insn_len == 2) |
| 643 | { |
| 644 | int stw_regnum = (insn2 >> 5) & 0x7; |
| 645 | if (CSKY_16_IS_STWx0 (insn2) && (mfcr_regnum == stw_regnum)) |
| 646 | { |
| 647 | int offset; |
| 648 | |
| 649 | /* CSKY_EPSR_REGNUM. */ |
| 650 | rn = CSKY_NUM_GREGS; |
| 651 | offset = CSKY_16_STWx0_OFFSET (insn2); |
| 652 | register_offsets[rn] = stacksize - offset; |
| 653 | if (csky_debug) |
| 654 | print_savedreg_msg (rn, register_offsets, true); |
| 655 | continue; |
| 656 | } |
| 657 | break; |
| 658 | } |
| 659 | else |
| 660 | { |
| 661 | /* INSN_LEN == 4. */ |
| 662 | int stw_regnum = (insn2 >> 21) & 0x1f; |
| 663 | if (CSKY_32_IS_STWx0 (insn2) && (mfcr_regnum == stw_regnum)) |
| 664 | { |
| 665 | int offset; |
| 666 | |
| 667 | /* CSKY_EPSR_REGNUM. */ |
| 668 | rn = CSKY_NUM_GREGS; |
| 669 | offset = CSKY_32_ST_OFFSET (insn2); |
| 670 | register_offsets[rn] = framesize - offset; |
| 671 | if (csky_debug) |
| 672 | print_savedreg_msg (rn, register_offsets, true); |
| 673 | continue; |
| 674 | } |
| 675 | break; |
| 676 | } |
| 677 | } |
| 678 | else if (CSKY_32_IS_MFCR_FPSR (insn)) |
| 679 | { |
| 680 | unsigned int insn2; |
| 681 | addr += 4; |
| 682 | int mfcr_regnum = insn & 0x1f; |
| 683 | insn_len = csky_get_insn (gdbarch, addr, &insn2); |
| 684 | if (insn_len == 2) |
| 685 | { |
| 686 | int stw_regnum = (insn2 >> 5) & 0x7; |
| 687 | if (CSKY_16_IS_STWx0 (insn2) && (mfcr_regnum |
| 688 | == stw_regnum)) |
| 689 | { |
| 690 | int offset; |
| 691 | |
| 692 | /* CSKY_FPSR_REGNUM. */ |
| 693 | rn = CSKY_NUM_GREGS + 1; |
| 694 | offset = CSKY_16_STWx0_OFFSET (insn2); |
| 695 | register_offsets[rn] = stacksize - offset; |
| 696 | if (csky_debug) |
| 697 | print_savedreg_msg (rn, register_offsets, true); |
| 698 | continue; |
| 699 | } |
| 700 | break; |
| 701 | } |
| 702 | else |
| 703 | { |
| 704 | /* INSN_LEN == 4. */ |
| 705 | int stw_regnum = (insn2 >> 21) & 0x1f; |
| 706 | if (CSKY_32_IS_STWx0 (insn2) && (mfcr_regnum == stw_regnum)) |
| 707 | { |
| 708 | int offset; |
| 709 | |
| 710 | /* CSKY_FPSR_REGNUM. */ |
| 711 | rn = CSKY_NUM_GREGS + 1; |
| 712 | offset = CSKY_32_ST_OFFSET (insn2); |
| 713 | register_offsets[rn] = framesize - offset; |
| 714 | if (csky_debug) |
| 715 | print_savedreg_msg (rn, register_offsets, true); |
| 716 | continue; |
| 717 | } |
| 718 | break; |
| 719 | } |
| 720 | } |
| 721 | else if (CSKY_32_IS_MFCR_EPC (insn)) |
| 722 | { |
| 723 | unsigned int insn2; |
| 724 | addr += 4; |
| 725 | int mfcr_regnum = insn & 0x1f; |
| 726 | insn_len = csky_get_insn (gdbarch, addr, &insn2); |
| 727 | if (insn_len == 2) |
| 728 | { |
| 729 | int stw_regnum = (insn2 >> 5) & 0x7; |
| 730 | if (CSKY_16_IS_STWx0 (insn2) && (mfcr_regnum == stw_regnum)) |
| 731 | { |
| 732 | int offset; |
| 733 | |
| 734 | /* CSKY_EPC_REGNUM. */ |
| 735 | rn = CSKY_NUM_GREGS + 2; |
| 736 | offset = CSKY_16_STWx0_OFFSET (insn2); |
| 737 | register_offsets[rn] = stacksize - offset; |
| 738 | if (csky_debug) |
| 739 | print_savedreg_msg (rn, register_offsets, true); |
| 740 | continue; |
| 741 | } |
| 742 | break; |
| 743 | } |
| 744 | else |
| 745 | { |
| 746 | /* INSN_LEN == 4. */ |
| 747 | int stw_regnum = (insn2 >> 21) & 0x1f; |
| 748 | if (CSKY_32_IS_STWx0 (insn2) && (mfcr_regnum == stw_regnum)) |
| 749 | { |
| 750 | int offset; |
| 751 | |
| 752 | /* CSKY_EPC_REGNUM. */ |
| 753 | rn = CSKY_NUM_GREGS + 2; |
| 754 | offset = CSKY_32_ST_OFFSET (insn2); |
| 755 | register_offsets[rn] = framesize - offset; |
| 756 | if (csky_debug) |
| 757 | print_savedreg_msg (rn, register_offsets, true); |
| 758 | continue; |
| 759 | } |
| 760 | break; |
| 761 | } |
| 762 | } |
| 763 | else if (CSKY_32_IS_MFCR_FPC (insn)) |
| 764 | { |
| 765 | unsigned int insn2; |
| 766 | addr += 4; |
| 767 | int mfcr_regnum = insn & 0x1f; |
| 768 | insn_len = csky_get_insn (gdbarch, addr, &insn2); |
| 769 | if (insn_len == 2) |
| 770 | { |
| 771 | int stw_regnum = (insn2 >> 5) & 0x7; |
| 772 | if (CSKY_16_IS_STWx0 (insn2) && (mfcr_regnum == stw_regnum)) |
| 773 | { |
| 774 | int offset; |
| 775 | |
| 776 | /* CSKY_FPC_REGNUM. */ |
| 777 | rn = CSKY_NUM_GREGS + 3; |
| 778 | offset = CSKY_16_STWx0_OFFSET (insn2); |
| 779 | register_offsets[rn] = stacksize - offset; |
| 780 | if (csky_debug) |
| 781 | print_savedreg_msg (rn, register_offsets, true); |
| 782 | continue; |
| 783 | } |
| 784 | break; |
| 785 | } |
| 786 | else |
| 787 | { |
| 788 | /* INSN_LEN == 4. */ |
| 789 | int stw_regnum = (insn2 >> 21) & 0x1f; |
| 790 | if (CSKY_32_IS_STWx0 (insn2) && (mfcr_regnum == stw_regnum)) |
| 791 | { |
| 792 | int offset; |
| 793 | |
| 794 | /* CSKY_FPC_REGNUM. */ |
| 795 | rn = CSKY_NUM_GREGS + 3; |
| 796 | offset = CSKY_32_ST_OFFSET (insn2); |
| 797 | register_offsets[rn] = framesize - offset; |
| 798 | if (csky_debug) |
| 799 | print_savedreg_msg (rn, register_offsets, true); |
| 800 | continue; |
| 801 | } |
| 802 | break; |
| 803 | } |
| 804 | } |
| 805 | else if (CSKY_32_IS_PUSH (insn)) |
| 806 | { |
| 807 | /* Push for 32_bit. */ |
| 808 | int offset = 0; |
| 809 | if (CSKY_32_IS_PUSH_R29 (insn)) |
| 810 | { |
| 811 | stacksize += 4; |
| 812 | register_offsets[29] = stacksize; |
| 813 | if (csky_debug) |
| 814 | print_savedreg_msg (29, register_offsets, false); |
| 815 | offset += 4; |
| 816 | } |
| 817 | if (CSKY_32_PUSH_LIST2 (insn)) |
| 818 | { |
| 819 | int num = CSKY_32_PUSH_LIST2 (insn); |
| 820 | int tmp = 0; |
| 821 | stacksize += num * 4; |
| 822 | offset += num * 4; |
| 823 | if (csky_debug) |
| 824 | { |
| 825 | fprintf_unfiltered (gdb_stdlog, |
| 826 | "csky: push regs_array: r16-r%d\n", |
| 827 | 16 + num - 1); |
| 828 | } |
| 829 | for (rn = 16; rn <= 16 + num - 1; rn++) |
| 830 | { |
| 831 | register_offsets[rn] = stacksize - tmp; |
| 832 | if (csky_debug) |
| 833 | { |
| 834 | fprintf_unfiltered (gdb_stdlog, |
| 835 | "csky: r%d saved at 0x%x" |
| 836 | " (offset %d)\n", rn, |
| 837 | register_offsets[rn], tmp); |
| 838 | } |
| 839 | tmp += 4; |
| 840 | } |
| 841 | } |
| 842 | if (CSKY_32_IS_PUSH_R15 (insn)) |
| 843 | { |
| 844 | stacksize += 4; |
| 845 | register_offsets[15] = stacksize; |
| 846 | if (csky_debug) |
| 847 | print_savedreg_msg (15, register_offsets, false); |
| 848 | offset += 4; |
| 849 | } |
| 850 | if (CSKY_32_PUSH_LIST1 (insn)) |
| 851 | { |
| 852 | int num = CSKY_32_PUSH_LIST1 (insn); |
| 853 | int tmp = 0; |
| 854 | stacksize += num * 4; |
| 855 | offset += num * 4; |
| 856 | if (csky_debug) |
| 857 | { |
| 858 | fprintf_unfiltered (gdb_stdlog, |
| 859 | "csky: push regs_array: r4-r%d\n", |
| 860 | 4 + num - 1); |
| 861 | } |
| 862 | for (rn = 4; rn <= 4 + num - 1; rn++) |
| 863 | { |
| 864 | register_offsets[rn] = stacksize - tmp; |
| 865 | if (csky_debug) |
| 866 | { |
| 867 | fprintf_unfiltered (gdb_stdlog, |
| 868 | "csky: r%d saved at 0x%x" |
| 869 | " (offset %d)\n", rn, |
| 870 | register_offsets[rn], tmp); |
| 871 | } |
| 872 | tmp += 4; |
| 873 | } |
| 874 | } |
| 875 | |
| 876 | framesize = stacksize; |
| 877 | if (csky_debug) |
| 878 | fprintf_unfiltered (gdb_stdlog, "csky: continuing\n"); |
| 879 | continue; |
| 880 | } |
| 881 | else if (CSKY_32_IS_LRW4 (insn) || CSKY_32_IS_MOVI4 (insn) |
| 882 | || CSKY_32_IS_MOVIH4 (insn) || CSKY_32_IS_BMASKI4 (insn)) |
| 883 | { |
| 884 | int adjust = 0; |
| 885 | int offset = 0; |
| 886 | unsigned int insn2; |
| 887 | |
| 888 | if (csky_debug) |
| 889 | { |
| 890 | fprintf_unfiltered (gdb_stdlog, |
| 891 | "csky: looking at large frame\n"); |
| 892 | } |
| 893 | if (CSKY_32_IS_LRW4 (insn)) |
| 894 | { |
| 895 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 896 | int literal_addr = (addr + ((insn & 0xffff) << 2)) |
| 897 | & 0xfffffffc; |
| 898 | adjust = read_memory_unsigned_integer (literal_addr, 4, |
| 899 | byte_order); |
| 900 | } |
| 901 | else if (CSKY_32_IS_MOVI4 (insn)) |
| 902 | adjust = (insn & 0xffff); |
| 903 | else if (CSKY_32_IS_MOVIH4 (insn)) |
| 904 | adjust = (insn & 0xffff) << 16; |
| 905 | else |
| 906 | { |
| 907 | /* CSKY_32_IS_BMASKI4 (insn). */ |
| 908 | adjust = (1 << (((insn & 0x3e00000) >> 21) + 1)) - 1; |
| 909 | } |
| 910 | |
| 911 | if (csky_debug) |
| 912 | { |
| 913 | fprintf_unfiltered (gdb_stdlog, |
| 914 | "csky: base stacksize=0x%x\n", adjust); |
| 915 | |
| 916 | /* May have zero or more insns which modify r4. */ |
| 917 | fprintf_unfiltered (gdb_stdlog, |
| 918 | "csky: looking for r4 adjusters...\n"); |
| 919 | } |
| 920 | |
| 921 | offset = 4; |
| 922 | insn_len = csky_get_insn (gdbarch, addr + offset, &insn2); |
| 923 | while (CSKY_IS_R4_ADJUSTER (insn2)) |
| 924 | { |
| 925 | if (CSKY_32_IS_ADDI4 (insn2)) |
| 926 | { |
| 927 | int imm = (insn2 & 0xfff) + 1; |
| 928 | adjust += imm; |
| 929 | if (csky_debug) |
| 930 | { |
| 931 | fprintf_unfiltered (gdb_stdlog, |
| 932 | "csky: addi r4,%d\n", imm); |
| 933 | } |
| 934 | } |
| 935 | else if (CSKY_32_IS_SUBI4 (insn2)) |
| 936 | { |
| 937 | int imm = (insn2 & 0xfff) + 1; |
| 938 | adjust -= imm; |
| 939 | if (csky_debug) |
| 940 | { |
| 941 | fprintf_unfiltered (gdb_stdlog, |
| 942 | "csky: subi r4,%d\n", imm); |
| 943 | } |
| 944 | } |
| 945 | else if (CSKY_32_IS_NOR4 (insn2)) |
| 946 | { |
| 947 | adjust = ~adjust; |
| 948 | if (csky_debug) |
| 949 | { |
| 950 | fprintf_unfiltered (gdb_stdlog, |
| 951 | "csky: nor r4,r4,r4\n"); |
| 952 | } |
| 953 | } |
| 954 | else if (CSKY_32_IS_ROTLI4 (insn2)) |
| 955 | { |
| 956 | int imm = ((insn2 >> 21) & 0x1f); |
| 957 | int temp = adjust >> (32 - imm); |
| 958 | adjust <<= imm; |
| 959 | adjust |= temp; |
| 960 | if (csky_debug) |
| 961 | { |
| 962 | fprintf_unfiltered (gdb_stdlog, |
| 963 | "csky: rotli r4,r4,%d\n", imm); |
| 964 | } |
| 965 | } |
| 966 | else if (CSKY_32_IS_LISI4 (insn2)) |
| 967 | { |
| 968 | int imm = ((insn2 >> 21) & 0x1f); |
| 969 | adjust <<= imm; |
| 970 | if (csky_debug) |
| 971 | { |
| 972 | fprintf_unfiltered (gdb_stdlog, |
| 973 | "csky: lsli r4,r4,%d\n", imm); |
| 974 | } |
| 975 | } |
| 976 | else if (CSKY_32_IS_BSETI4 (insn2)) |
| 977 | { |
| 978 | int imm = ((insn2 >> 21) & 0x1f); |
| 979 | adjust |= (1 << imm); |
| 980 | if (csky_debug) |
| 981 | { |
| 982 | fprintf_unfiltered (gdb_stdlog, |
| 983 | "csky: bseti r4,r4 %d\n", imm); |
| 984 | } |
| 985 | } |
| 986 | else if (CSKY_32_IS_BCLRI4 (insn2)) |
| 987 | { |
| 988 | int imm = ((insn2 >> 21) & 0x1f); |
| 989 | adjust &= ~(1 << imm); |
| 990 | if (csky_debug) |
| 991 | { |
| 992 | fprintf_unfiltered (gdb_stdlog, |
| 993 | "csky: bclri r4,r4 %d\n", imm); |
| 994 | } |
| 995 | } |
| 996 | else if (CSKY_32_IS_IXH4 (insn2)) |
| 997 | { |
| 998 | adjust *= 3; |
| 999 | if (csky_debug) |
| 1000 | { |
| 1001 | fprintf_unfiltered (gdb_stdlog, |
| 1002 | "csky: ixh r4,r4,r4\n"); |
| 1003 | } |
| 1004 | } |
| 1005 | else if (CSKY_32_IS_IXW4 (insn2)) |
| 1006 | { |
| 1007 | adjust *= 5; |
| 1008 | if (csky_debug) |
| 1009 | { |
| 1010 | fprintf_unfiltered (gdb_stdlog, |
| 1011 | "csky: ixw r4,r4,r4\n"); |
| 1012 | } |
| 1013 | } |
| 1014 | else if (CSKY_16_IS_ADDI4 (insn2)) |
| 1015 | { |
| 1016 | int imm = (insn2 & 0xff) + 1; |
| 1017 | adjust += imm; |
| 1018 | if (csky_debug) |
| 1019 | { |
| 1020 | fprintf_unfiltered (gdb_stdlog, |
| 1021 | "csky: addi r4,%d\n", imm); |
| 1022 | } |
| 1023 | } |
| 1024 | else if (CSKY_16_IS_SUBI4 (insn2)) |
| 1025 | { |
| 1026 | int imm = (insn2 & 0xff) + 1; |
| 1027 | adjust -= imm; |
| 1028 | if (csky_debug) |
| 1029 | { |
| 1030 | fprintf_unfiltered (gdb_stdlog, |
| 1031 | "csky: subi r4,%d\n", imm); |
| 1032 | } |
| 1033 | } |
| 1034 | else if (CSKY_16_IS_NOR4 (insn2)) |
| 1035 | { |
| 1036 | adjust = ~adjust; |
| 1037 | if (csky_debug) |
| 1038 | { |
| 1039 | fprintf_unfiltered (gdb_stdlog, |
| 1040 | "csky: nor r4,r4\n"); |
| 1041 | } |
| 1042 | } |
| 1043 | else if (CSKY_16_IS_BSETI4 (insn2)) |
| 1044 | { |
| 1045 | int imm = (insn2 & 0x1f); |
| 1046 | adjust |= (1 << imm); |
| 1047 | if (csky_debug) |
| 1048 | { |
| 1049 | fprintf_unfiltered (gdb_stdlog, |
| 1050 | "csky: bseti r4, %d\n", imm); |
| 1051 | } |
| 1052 | } |
| 1053 | else if (CSKY_16_IS_BCLRI4 (insn2)) |
| 1054 | { |
| 1055 | int imm = (insn2 & 0x1f); |
| 1056 | adjust &= ~(1 << imm); |
| 1057 | if (csky_debug) |
| 1058 | { |
| 1059 | fprintf_unfiltered (gdb_stdlog, |
| 1060 | "csky: bclri r4, %d\n", imm); |
| 1061 | } |
| 1062 | } |
| 1063 | else if (CSKY_16_IS_LSLI4 (insn2)) |
| 1064 | { |
| 1065 | int imm = (insn2 & 0x1f); |
| 1066 | adjust <<= imm; |
| 1067 | if (csky_debug) |
| 1068 | { |
| 1069 | fprintf_unfiltered (gdb_stdlog, |
| 1070 | "csky: lsli r4,r4, %d\n", imm); |
| 1071 | } |
| 1072 | } |
| 1073 | |
| 1074 | offset += insn_len; |
| 1075 | insn_len = csky_get_insn (gdbarch, addr + offset, &insn2); |
| 1076 | }; |
| 1077 | |
| 1078 | if (csky_debug) |
| 1079 | { |
| 1080 | fprintf_unfiltered (gdb_stdlog, "csky: done looking for" |
| 1081 | " r4 adjusters\n"); |
| 1082 | } |
| 1083 | |
| 1084 | /* If the next insn adjusts the stack pointer, we keep |
| 1085 | everything; if not, we scrap it and we've found the |
| 1086 | end of the prologue. */ |
| 1087 | if (CSKY_IS_SUBU4 (insn2)) |
| 1088 | { |
| 1089 | addr += offset; |
| 1090 | stacksize += adjust; |
| 1091 | if (csky_debug) |
| 1092 | { |
| 1093 | fprintf_unfiltered (gdb_stdlog, |
| 1094 | "csky: found stack adjustment of" |
| 1095 | " 0x%x bytes.\n", adjust); |
| 1096 | fprintf_unfiltered (gdb_stdlog, |
| 1097 | "csky: skipping to new address %s\n", |
| 1098 | core_addr_to_string_nz (addr)); |
| 1099 | fprintf_unfiltered (gdb_stdlog, |
| 1100 | "csky: continuing\n"); |
| 1101 | } |
| 1102 | continue; |
| 1103 | } |
| 1104 | |
| 1105 | /* None of these instructions are prologue, so don't touch |
| 1106 | anything. */ |
| 1107 | if (csky_debug) |
| 1108 | { |
| 1109 | fprintf_unfiltered (gdb_stdlog, |
| 1110 | "csky: no subu sp,sp,r4; NOT altering" |
| 1111 | " stacksize.\n"); |
| 1112 | } |
| 1113 | break; |
| 1114 | } |
| 1115 | } |
| 1116 | else |
| 1117 | { |
| 1118 | /* insn_len != 4. */ |
| 1119 | |
| 1120 | /* subi.sp sp,disp. */ |
| 1121 | if (CSKY_16_IS_SUBI0 (insn)) |
| 1122 | { |
| 1123 | int offset = CSKY_16_SUBI_IMM (insn); |
| 1124 | if (csky_debug) |
| 1125 | { |
| 1126 | fprintf_unfiltered (gdb_stdlog, |
| 1127 | "csky: got subi r0,%d; continuing\n", |
| 1128 | offset); |
| 1129 | } |
| 1130 | stacksize += offset; |
| 1131 | continue; |
| 1132 | } |
| 1133 | /* stw.16 rz,(sp,disp). */ |
| 1134 | else if (CSKY_16_IS_STWx0 (insn)) |
| 1135 | { |
| 1136 | /* Spill register: see note for IS_STM above. */ |
| 1137 | int disp; |
| 1138 | |
| 1139 | rn = CSKY_16_ST_VAL_REGNUM (insn); |
| 1140 | disp = CSKY_16_ST_OFFSET (insn); |
| 1141 | register_offsets[rn] = stacksize - disp; |
| 1142 | if (csky_debug) |
| 1143 | print_savedreg_msg (rn, register_offsets, true); |
| 1144 | continue; |
| 1145 | } |
| 1146 | else if (CSKY_16_IS_MOV_FP_SP (insn)) |
| 1147 | { |
| 1148 | /* SP is saved to FP reg, means prologue may modify SP. */ |
| 1149 | is_fp_saved = 1; |
| 1150 | adjust_fp = stacksize; |
| 1151 | continue; |
| 1152 | } |
| 1153 | else if (CSKY_16_IS_PUSH (insn)) |
| 1154 | { |
| 1155 | /* Push for 16_bit. */ |
| 1156 | int offset = 0; |
| 1157 | if (CSKY_16_IS_PUSH_R15 (insn)) |
| 1158 | { |
| 1159 | stacksize += 4; |
| 1160 | register_offsets[15] = stacksize; |
| 1161 | if (csky_debug) |
| 1162 | print_savedreg_msg (15, register_offsets, false); |
| 1163 | offset += 4; |
| 1164 | } |
| 1165 | if (CSKY_16_PUSH_LIST1 (insn)) |
| 1166 | { |
| 1167 | int num = CSKY_16_PUSH_LIST1 (insn); |
| 1168 | int tmp = 0; |
| 1169 | stacksize += num * 4; |
| 1170 | offset += num * 4; |
| 1171 | if (csky_debug) |
| 1172 | { |
| 1173 | fprintf_unfiltered (gdb_stdlog, |
| 1174 | "csky: push regs_array: r4-r%d\n", |
| 1175 | 4 + num - 1); |
| 1176 | } |
| 1177 | for (rn = 4; rn <= 4 + num - 1; rn++) |
| 1178 | { |
| 1179 | register_offsets[rn] = stacksize - tmp; |
| 1180 | if (csky_debug) |
| 1181 | { |
| 1182 | fprintf_unfiltered (gdb_stdlog, |
| 1183 | "csky: r%d saved at 0x%x" |
| 1184 | " (offset %d)\n", rn, |
| 1185 | register_offsets[rn], offset); |
| 1186 | } |
| 1187 | tmp += 4; |
| 1188 | } |
| 1189 | } |
| 1190 | |
| 1191 | framesize = stacksize; |
| 1192 | if (csky_debug) |
| 1193 | fprintf_unfiltered (gdb_stdlog, "csky: continuing\n"); |
| 1194 | continue; |
| 1195 | } |
| 1196 | else if (CSKY_16_IS_LRW4 (insn) || CSKY_16_IS_MOVI4 (insn)) |
| 1197 | { |
| 1198 | int adjust = 0; |
| 1199 | unsigned int insn2; |
| 1200 | |
| 1201 | if (csky_debug) |
| 1202 | { |
| 1203 | fprintf_unfiltered (gdb_stdlog, |
| 1204 | "csky: looking at large frame\n"); |
| 1205 | } |
| 1206 | if (CSKY_16_IS_LRW4 (insn)) |
| 1207 | { |
| 1208 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 1209 | int offset = ((insn & 0x300) >> 3) | (insn & 0x1f); |
| 1210 | int literal_addr = (addr + ( offset << 2)) & 0xfffffffc; |
| 1211 | adjust = read_memory_unsigned_integer (literal_addr, 4, |
| 1212 | byte_order); |
| 1213 | } |
| 1214 | else |
| 1215 | { |
| 1216 | /* CSKY_16_IS_MOVI4 (insn). */ |
| 1217 | adjust = (insn & 0xff); |
| 1218 | } |
| 1219 | |
| 1220 | if (csky_debug) |
| 1221 | { |
| 1222 | fprintf_unfiltered (gdb_stdlog, |
| 1223 | "csky: base stacksize=0x%x\n", adjust); |
| 1224 | } |
| 1225 | |
| 1226 | /* May have zero or more instructions which modify r4. */ |
| 1227 | if (csky_debug) |
| 1228 | { |
| 1229 | fprintf_unfiltered (gdb_stdlog, |
| 1230 | "csky: looking for r4 adjusters...\n"); |
| 1231 | } |
| 1232 | int offset = 2; |
| 1233 | insn_len = csky_get_insn (gdbarch, addr + offset, &insn2); |
| 1234 | while (CSKY_IS_R4_ADJUSTER (insn2)) |
| 1235 | { |
| 1236 | if (CSKY_32_IS_ADDI4 (insn2)) |
| 1237 | { |
| 1238 | int imm = (insn2 & 0xfff) + 1; |
| 1239 | adjust += imm; |
| 1240 | if (csky_debug) |
| 1241 | { |
| 1242 | fprintf_unfiltered (gdb_stdlog, |
| 1243 | "csky: addi r4,%d\n", imm); |
| 1244 | } |
| 1245 | } |
| 1246 | else if (CSKY_32_IS_SUBI4 (insn2)) |
| 1247 | { |
| 1248 | int imm = (insn2 & 0xfff) + 1; |
| 1249 | adjust -= imm; |
| 1250 | if (csky_debug) |
| 1251 | { |
| 1252 | fprintf_unfiltered (gdb_stdlog, |
| 1253 | "csky: subi r4,%d\n", imm); |
| 1254 | } |
| 1255 | } |
| 1256 | else if (CSKY_32_IS_NOR4 (insn2)) |
| 1257 | { |
| 1258 | adjust = ~adjust; |
| 1259 | if (csky_debug) |
| 1260 | { |
| 1261 | fprintf_unfiltered (gdb_stdlog, |
| 1262 | "csky: nor r4,r4,r4\n"); |
| 1263 | } |
| 1264 | } |
| 1265 | else if (CSKY_32_IS_ROTLI4 (insn2)) |
| 1266 | { |
| 1267 | int imm = ((insn2 >> 21) & 0x1f); |
| 1268 | int temp = adjust >> (32 - imm); |
| 1269 | adjust <<= imm; |
| 1270 | adjust |= temp; |
| 1271 | if (csky_debug) |
| 1272 | { |
| 1273 | fprintf_unfiltered (gdb_stdlog, |
| 1274 | "csky: rotli r4,r4,%d\n", imm); |
| 1275 | } |
| 1276 | } |
| 1277 | else if (CSKY_32_IS_LISI4 (insn2)) |
| 1278 | { |
| 1279 | int imm = ((insn2 >> 21) & 0x1f); |
| 1280 | adjust <<= imm; |
| 1281 | if (csky_debug) |
| 1282 | { |
| 1283 | fprintf_unfiltered (gdb_stdlog, |
| 1284 | "csky: lsli r4,r4,%d\n", imm); |
| 1285 | } |
| 1286 | } |
| 1287 | else if (CSKY_32_IS_BSETI4 (insn2)) |
| 1288 | { |
| 1289 | int imm = ((insn2 >> 21) & 0x1f); |
| 1290 | adjust |= (1 << imm); |
| 1291 | if (csky_debug) |
| 1292 | { |
| 1293 | fprintf_unfiltered (gdb_stdlog, |
| 1294 | "csky: bseti r4,r4 %d\n", imm); |
| 1295 | } |
| 1296 | } |
| 1297 | else if (CSKY_32_IS_BCLRI4 (insn2)) |
| 1298 | { |
| 1299 | int imm = ((insn2 >> 21) & 0x1f); |
| 1300 | adjust &= ~(1 << imm); |
| 1301 | if (csky_debug) |
| 1302 | { |
| 1303 | fprintf_unfiltered (gdb_stdlog, |
| 1304 | "csky: bclri r4,r4 %d\n", imm); |
| 1305 | } |
| 1306 | } |
| 1307 | else if (CSKY_32_IS_IXH4 (insn2)) |
| 1308 | { |
| 1309 | adjust *= 3; |
| 1310 | if (csky_debug) |
| 1311 | { |
| 1312 | fprintf_unfiltered (gdb_stdlog, |
| 1313 | "csky: ixh r4,r4,r4\n"); |
| 1314 | } |
| 1315 | } |
| 1316 | else if (CSKY_32_IS_IXW4 (insn2)) |
| 1317 | { |
| 1318 | adjust *= 5; |
| 1319 | if (csky_debug) |
| 1320 | { |
| 1321 | fprintf_unfiltered (gdb_stdlog, |
| 1322 | "csky: ixw r4,r4,r4\n"); |
| 1323 | } |
| 1324 | } |
| 1325 | else if (CSKY_16_IS_ADDI4 (insn2)) |
| 1326 | { |
| 1327 | int imm = (insn2 & 0xff) + 1; |
| 1328 | adjust += imm; |
| 1329 | if (csky_debug) |
| 1330 | { |
| 1331 | fprintf_unfiltered (gdb_stdlog, |
| 1332 | "csky: addi r4,%d\n", imm); |
| 1333 | } |
| 1334 | } |
| 1335 | else if (CSKY_16_IS_SUBI4 (insn2)) |
| 1336 | { |
| 1337 | int imm = (insn2 & 0xff) + 1; |
| 1338 | adjust -= imm; |
| 1339 | if (csky_debug) |
| 1340 | { |
| 1341 | fprintf_unfiltered (gdb_stdlog, |
| 1342 | "csky: subi r4,%d\n", imm); |
| 1343 | } |
| 1344 | } |
| 1345 | else if (CSKY_16_IS_NOR4 (insn2)) |
| 1346 | { |
| 1347 | adjust = ~adjust; |
| 1348 | if (csky_debug) |
| 1349 | { |
| 1350 | fprintf_unfiltered (gdb_stdlog, |
| 1351 | "csky: nor r4,r4\n"); |
| 1352 | } |
| 1353 | } |
| 1354 | else if (CSKY_16_IS_BSETI4 (insn2)) |
| 1355 | { |
| 1356 | int imm = (insn2 & 0x1f); |
| 1357 | adjust |= (1 << imm); |
| 1358 | if (csky_debug) |
| 1359 | { |
| 1360 | fprintf_unfiltered (gdb_stdlog, |
| 1361 | "csky: bseti r4, %d\n", imm); |
| 1362 | } |
| 1363 | } |
| 1364 | else if (CSKY_16_IS_BCLRI4 (insn2)) |
| 1365 | { |
| 1366 | int imm = (insn2 & 0x1f); |
| 1367 | adjust &= ~(1 << imm); |
| 1368 | if (csky_debug) |
| 1369 | { |
| 1370 | fprintf_unfiltered (gdb_stdlog, |
| 1371 | "csky: bclri r4, %d\n", imm); |
| 1372 | } |
| 1373 | } |
| 1374 | else if (CSKY_16_IS_LSLI4 (insn2)) |
| 1375 | { |
| 1376 | int imm = (insn2 & 0x1f); |
| 1377 | adjust <<= imm; |
| 1378 | if (csky_debug) |
| 1379 | { |
| 1380 | fprintf_unfiltered (gdb_stdlog, |
| 1381 | "csky: lsli r4,r4, %d\n", imm); |
| 1382 | } |
| 1383 | } |
| 1384 | |
| 1385 | offset += insn_len; |
| 1386 | insn_len = csky_get_insn (gdbarch, addr + offset, &insn2); |
| 1387 | }; |
| 1388 | |
| 1389 | if (csky_debug) |
| 1390 | { |
| 1391 | fprintf_unfiltered (gdb_stdlog, "csky: " |
| 1392 | "done looking for r4 adjusters\n"); |
| 1393 | } |
| 1394 | |
| 1395 | /* If the next instruction adjusts the stack pointer, we keep |
| 1396 | everything; if not, we scrap it and we've found the end |
| 1397 | of the prologue. */ |
| 1398 | if (CSKY_IS_SUBU4 (insn2)) |
| 1399 | { |
| 1400 | addr += offset; |
| 1401 | stacksize += adjust; |
| 1402 | if (csky_debug) |
| 1403 | { |
| 1404 | fprintf_unfiltered (gdb_stdlog, "csky: " |
| 1405 | "found stack adjustment of 0x%x" |
| 1406 | " bytes.\n", adjust); |
| 1407 | fprintf_unfiltered (gdb_stdlog, "csky: " |
| 1408 | "skipping to new address %s\n", |
| 1409 | core_addr_to_string_nz (addr)); |
| 1410 | fprintf_unfiltered (gdb_stdlog, "csky: continuing\n"); |
| 1411 | } |
| 1412 | continue; |
| 1413 | } |
| 1414 | |
| 1415 | /* None of these instructions are prologue, so don't touch |
| 1416 | anything. */ |
| 1417 | if (csky_debug) |
| 1418 | { |
| 1419 | fprintf_unfiltered (gdb_stdlog, "csky: no subu sp,r4; " |
| 1420 | "NOT altering stacksize.\n"); |
| 1421 | } |
| 1422 | break; |
| 1423 | } |
| 1424 | } |
| 1425 | |
| 1426 | /* This is not a prologue instruction, so stop here. */ |
| 1427 | if (csky_debug) |
| 1428 | { |
| 1429 | fprintf_unfiltered (gdb_stdlog, "csky: insn is not a prologue" |
| 1430 | " insn -- ending scan\n"); |
| 1431 | } |
| 1432 | break; |
| 1433 | } |
| 1434 | |
| 1435 | if (this_cache) |
| 1436 | { |
| 1437 | CORE_ADDR unwound_fp; |
| 1438 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 1439 | this_cache->framesize = framesize; |
| 1440 | |
| 1441 | if (is_fp_saved) |
| 1442 | { |
| 1443 | this_cache->framereg = CSKY_FP_REGNUM; |
| 1444 | unwound_fp = get_frame_register_unsigned (this_frame, |
| 1445 | this_cache->framereg); |
| 1446 | this_cache->prev_sp = unwound_fp + adjust_fp; |
| 1447 | } |
| 1448 | else |
| 1449 | { |
| 1450 | this_cache->framereg = CSKY_SP_REGNUM; |
| 1451 | unwound_fp = get_frame_register_unsigned (this_frame, |
| 1452 | this_cache->framereg); |
| 1453 | this_cache->prev_sp = unwound_fp + stacksize; |
| 1454 | } |
| 1455 | |
| 1456 | /* Note where saved registers are stored. The offsets in |
| 1457 | REGISTER_OFFSETS are computed relative to the top of the frame. */ |
| 1458 | for (rn = 0; rn < CSKY_NUM_GREGS; rn++) |
| 1459 | { |
| 1460 | if (register_offsets[rn] >= 0) |
| 1461 | { |
| 1462 | this_cache->saved_regs[rn].addr |
| 1463 | = this_cache->prev_sp - register_offsets[rn]; |
| 1464 | if (csky_debug) |
| 1465 | { |
| 1466 | CORE_ADDR rn_value = read_memory_unsigned_integer ( |
| 1467 | this_cache->saved_regs[rn].addr, 4, byte_order); |
| 1468 | fprintf_unfiltered (gdb_stdlog, "Saved register %s " |
| 1469 | "stored at 0x%08lx, value=0x%08lx\n", |
| 1470 | csky_register_names[rn], |
| 1471 | (unsigned long) |
| 1472 | this_cache->saved_regs[rn].addr, |
| 1473 | (unsigned long) rn_value); |
| 1474 | } |
| 1475 | } |
| 1476 | } |
| 1477 | if (lr_type == LR_TYPE_EPC) |
| 1478 | { |
| 1479 | /* rte || epc . */ |
| 1480 | this_cache->saved_regs[CSKY_PC_REGNUM] |
| 1481 | = this_cache->saved_regs[CSKY_EPC_REGNUM]; |
| 1482 | } |
| 1483 | else if (lr_type == LR_TYPE_FPC) |
| 1484 | { |
| 1485 | /* rfi || fpc . */ |
| 1486 | this_cache->saved_regs[CSKY_PC_REGNUM] |
| 1487 | = this_cache->saved_regs[CSKY_FPC_REGNUM]; |
| 1488 | } |
| 1489 | else |
| 1490 | { |
| 1491 | this_cache->saved_regs[CSKY_PC_REGNUM] |
| 1492 | = this_cache->saved_regs[CSKY_LR_REGNUM]; |
| 1493 | } |
| 1494 | } |
| 1495 | |
| 1496 | return addr; |
| 1497 | } |
| 1498 | |
| 1499 | /* Detect whether PC is at a point where the stack frame has been |
| 1500 | destroyed. */ |
| 1501 | |
| 1502 | static int |
| 1503 | csky_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 1504 | { |
| 1505 | unsigned int insn; |
| 1506 | CORE_ADDR addr; |
| 1507 | CORE_ADDR func_start, func_end; |
| 1508 | |
| 1509 | if (!find_pc_partial_function (pc, NULL, &func_start, &func_end)) |
| 1510 | return 0; |
| 1511 | |
| 1512 | bool fp_saved = false; |
| 1513 | int insn_len; |
| 1514 | for (addr = func_start; addr < func_end; addr += insn_len) |
| 1515 | { |
| 1516 | /* Get next insn. */ |
| 1517 | insn_len = csky_get_insn (gdbarch, addr, &insn); |
| 1518 | |
| 1519 | if (insn_len == 2) |
| 1520 | { |
| 1521 | /* Is sp is saved to fp. */ |
| 1522 | if (CSKY_16_IS_MOV_FP_SP (insn)) |
| 1523 | fp_saved = true; |
| 1524 | /* If sp was saved to fp and now being restored from |
| 1525 | fp then it indicates the start of epilog. */ |
| 1526 | else if (fp_saved && CSKY_16_IS_MOV_SP_FP (insn)) |
| 1527 | return pc >= addr; |
| 1528 | } |
| 1529 | } |
| 1530 | return 0; |
| 1531 | } |
| 1532 | |
| 1533 | /* Implement the skip_prologue gdbarch hook. */ |
| 1534 | |
| 1535 | static CORE_ADDR |
| 1536 | csky_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 1537 | { |
| 1538 | CORE_ADDR func_addr, func_end; |
| 1539 | struct symtab_and_line sal; |
| 1540 | const int default_search_limit = 128; |
| 1541 | |
| 1542 | /* See if we can find the end of the prologue using the symbol table. */ |
| 1543 | if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) |
| 1544 | { |
| 1545 | CORE_ADDR post_prologue_pc |
| 1546 | = skip_prologue_using_sal (gdbarch, func_addr); |
| 1547 | |
| 1548 | if (post_prologue_pc != 0) |
| 1549 | return std::max (pc, post_prologue_pc); |
| 1550 | } |
| 1551 | else |
| 1552 | func_end = pc + default_search_limit; |
| 1553 | |
| 1554 | /* Find the end of prologue. Default lr_type. */ |
| 1555 | return csky_analyze_prologue (gdbarch, pc, func_end, func_end, |
| 1556 | NULL, NULL, LR_TYPE_R15); |
| 1557 | } |
| 1558 | |
| 1559 | /* Implement the breakpoint_kind_from_pc gdbarch method. */ |
| 1560 | |
| 1561 | static int |
| 1562 | csky_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr) |
| 1563 | { |
| 1564 | if (csky_pc_is_csky16 (gdbarch, *pcptr)) |
| 1565 | return CSKY_INSN_SIZE16; |
| 1566 | else |
| 1567 | return CSKY_INSN_SIZE32; |
| 1568 | } |
| 1569 | |
| 1570 | /* Implement the sw_breakpoint_from_kind gdbarch method. */ |
| 1571 | |
| 1572 | static const gdb_byte * |
| 1573 | csky_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size) |
| 1574 | { |
| 1575 | *size = kind; |
| 1576 | if (kind == CSKY_INSN_SIZE16) |
| 1577 | { |
| 1578 | static gdb_byte csky_16_breakpoint[] = { 0, 0 }; |
| 1579 | return csky_16_breakpoint; |
| 1580 | } |
| 1581 | else |
| 1582 | { |
| 1583 | static gdb_byte csky_32_breakpoint[] = { 0, 0, 0, 0 }; |
| 1584 | return csky_32_breakpoint; |
| 1585 | } |
| 1586 | } |
| 1587 | |
| 1588 | /* Implement the memory_insert_breakpoint gdbarch method. */ |
| 1589 | |
| 1590 | static int |
| 1591 | csky_memory_insert_breakpoint (struct gdbarch *gdbarch, |
| 1592 | struct bp_target_info *bp_tgt) |
| 1593 | { |
| 1594 | int val; |
| 1595 | const unsigned char *bp; |
| 1596 | gdb_byte bp_write_record1[] = { 0, 0, 0, 0 }; |
| 1597 | gdb_byte bp_write_record2[] = { 0, 0, 0, 0 }; |
| 1598 | gdb_byte bp_record[] = { 0, 0, 0, 0 }; |
| 1599 | |
| 1600 | /* Sanity-check bp_address. */ |
| 1601 | if (bp_tgt->reqstd_address % 2) |
| 1602 | warning (_("Invalid breakpoint address 0x%x is an odd number."), |
| 1603 | (unsigned int) bp_tgt->reqstd_address); |
| 1604 | scoped_restore restore_memory |
| 1605 | = make_scoped_restore_show_memory_breakpoints (1); |
| 1606 | |
| 1607 | /* Determine appropriate breakpoint_kind for this address. */ |
| 1608 | bp_tgt->kind = csky_breakpoint_kind_from_pc (gdbarch, |
| 1609 | &bp_tgt->reqstd_address); |
| 1610 | |
| 1611 | /* Save the memory contents. */ |
| 1612 | bp_tgt->shadow_len = bp_tgt->kind; |
| 1613 | |
| 1614 | /* Fill bp_tgt->placed_address. */ |
| 1615 | bp_tgt->placed_address = bp_tgt->reqstd_address; |
| 1616 | |
| 1617 | if (bp_tgt->kind == CSKY_INSN_SIZE16) |
| 1618 | { |
| 1619 | if ((bp_tgt->reqstd_address % 4) == 0) |
| 1620 | { |
| 1621 | /* Read two bytes. */ |
| 1622 | val = target_read_memory (bp_tgt->reqstd_address, |
| 1623 | bp_tgt->shadow_contents, 2); |
| 1624 | if (val) |
| 1625 | return val; |
| 1626 | |
| 1627 | /* Read two bytes. */ |
| 1628 | val = target_read_memory (bp_tgt->reqstd_address + 2, |
| 1629 | bp_record, 2); |
| 1630 | if (val) |
| 1631 | return val; |
| 1632 | |
| 1633 | /* Write the breakpoint. */ |
| 1634 | bp_write_record1[2] = bp_record[0]; |
| 1635 | bp_write_record1[3] = bp_record[1]; |
| 1636 | bp = bp_write_record1; |
| 1637 | val = target_write_raw_memory (bp_tgt->reqstd_address, bp, |
| 1638 | CSKY_WR_BKPT_MODE); |
| 1639 | } |
| 1640 | else |
| 1641 | { |
| 1642 | val = target_read_memory (bp_tgt->reqstd_address, |
| 1643 | bp_tgt->shadow_contents, 2); |
| 1644 | if (val) |
| 1645 | return val; |
| 1646 | |
| 1647 | val = target_read_memory (bp_tgt->reqstd_address - 2, |
| 1648 | bp_record, 2); |
| 1649 | if (val) |
| 1650 | return val; |
| 1651 | |
| 1652 | /* Write the breakpoint. */ |
| 1653 | bp_write_record1[0] = bp_record[0]; |
| 1654 | bp_write_record1[1] = bp_record[1]; |
| 1655 | bp = bp_write_record1; |
| 1656 | val = target_write_raw_memory (bp_tgt->reqstd_address - 2, |
| 1657 | bp, CSKY_WR_BKPT_MODE); |
| 1658 | } |
| 1659 | } |
| 1660 | else |
| 1661 | { |
| 1662 | if (bp_tgt->placed_address % 4 == 0) |
| 1663 | { |
| 1664 | val = target_read_memory (bp_tgt->reqstd_address, |
| 1665 | bp_tgt->shadow_contents, |
| 1666 | CSKY_WR_BKPT_MODE); |
| 1667 | if (val) |
| 1668 | return val; |
| 1669 | |
| 1670 | /* Write the breakpoint. */ |
| 1671 | bp = bp_write_record1; |
| 1672 | val = target_write_raw_memory (bp_tgt->reqstd_address, |
| 1673 | bp, CSKY_WR_BKPT_MODE); |
| 1674 | } |
| 1675 | else |
| 1676 | { |
| 1677 | val = target_read_memory (bp_tgt->reqstd_address, |
| 1678 | bp_tgt->shadow_contents, |
| 1679 | CSKY_WR_BKPT_MODE); |
| 1680 | if (val) |
| 1681 | return val; |
| 1682 | |
| 1683 | val = target_read_memory (bp_tgt->reqstd_address - 2, |
| 1684 | bp_record, 2); |
| 1685 | if (val) |
| 1686 | return val; |
| 1687 | |
| 1688 | val = target_read_memory (bp_tgt->reqstd_address + 4, |
| 1689 | bp_record + 2, 2); |
| 1690 | if (val) |
| 1691 | return val; |
| 1692 | |
| 1693 | bp_write_record1[0] = bp_record[0]; |
| 1694 | bp_write_record1[1] = bp_record[1]; |
| 1695 | bp_write_record2[2] = bp_record[2]; |
| 1696 | bp_write_record2[3] = bp_record[3]; |
| 1697 | |
| 1698 | /* Write the breakpoint. */ |
| 1699 | bp = bp_write_record1; |
| 1700 | val = target_write_raw_memory (bp_tgt->reqstd_address - 2, bp, |
| 1701 | CSKY_WR_BKPT_MODE); |
| 1702 | if (val) |
| 1703 | return val; |
| 1704 | |
| 1705 | /* Write the breakpoint. */ |
| 1706 | bp = bp_write_record2; |
| 1707 | val = target_write_raw_memory (bp_tgt->reqstd_address + 2, bp, |
| 1708 | CSKY_WR_BKPT_MODE); |
| 1709 | } |
| 1710 | } |
| 1711 | return val; |
| 1712 | } |
| 1713 | |
| 1714 | /* Restore the breakpoint shadow_contents to the target. */ |
| 1715 | |
| 1716 | static int |
| 1717 | csky_memory_remove_breakpoint (struct gdbarch *gdbarch, |
| 1718 | struct bp_target_info *bp_tgt) |
| 1719 | { |
| 1720 | int val; |
| 1721 | gdb_byte bp_record[] = { 0, 0, 0, 0, 0, 0, 0, 0 }; |
| 1722 | /* Different for shadow_len 2 or 4. */ |
| 1723 | if (bp_tgt->shadow_len == 2) |
| 1724 | { |
| 1725 | /* Do word-sized writes on word-aligned boundaries and read |
| 1726 | padding bytes as necessary. */ |
| 1727 | if (bp_tgt->reqstd_address % 4 == 0) |
| 1728 | { |
| 1729 | val = target_read_memory (bp_tgt->reqstd_address + 2, |
| 1730 | bp_record + 2, 2); |
| 1731 | if (val) |
| 1732 | return val; |
| 1733 | bp_record[0] = bp_tgt->shadow_contents[0]; |
| 1734 | bp_record[1] = bp_tgt->shadow_contents[1]; |
| 1735 | return target_write_raw_memory (bp_tgt->reqstd_address, |
| 1736 | bp_record, CSKY_WR_BKPT_MODE); |
| 1737 | } |
| 1738 | else |
| 1739 | { |
| 1740 | val = target_read_memory (bp_tgt->reqstd_address - 2, |
| 1741 | bp_record, 2); |
| 1742 | if (val) |
| 1743 | return val; |
| 1744 | bp_record[2] = bp_tgt->shadow_contents[0]; |
| 1745 | bp_record[3] = bp_tgt->shadow_contents[1]; |
| 1746 | return target_write_raw_memory (bp_tgt->reqstd_address - 2, |
| 1747 | bp_record, CSKY_WR_BKPT_MODE); |
| 1748 | } |
| 1749 | } |
| 1750 | else |
| 1751 | { |
| 1752 | /* Do word-sized writes on word-aligned boundaries and read |
| 1753 | padding bytes as necessary. */ |
| 1754 | if (bp_tgt->placed_address % 4 == 0) |
| 1755 | { |
| 1756 | return target_write_raw_memory (bp_tgt->reqstd_address, |
| 1757 | bp_tgt->shadow_contents, |
| 1758 | CSKY_WR_BKPT_MODE); |
| 1759 | } |
| 1760 | else |
| 1761 | { |
| 1762 | val = target_read_memory (bp_tgt->reqstd_address - 2, |
| 1763 | bp_record, 2); |
| 1764 | if (val) |
| 1765 | return val; |
| 1766 | val = target_read_memory (bp_tgt->reqstd_address + 4, |
| 1767 | bp_record+6, 2); |
| 1768 | if (val) |
| 1769 | return val; |
| 1770 | |
| 1771 | bp_record[2] = bp_tgt->shadow_contents[0]; |
| 1772 | bp_record[3] = bp_tgt->shadow_contents[1]; |
| 1773 | bp_record[4] = bp_tgt->shadow_contents[2]; |
| 1774 | bp_record[5] = bp_tgt->shadow_contents[3]; |
| 1775 | |
| 1776 | return target_write_raw_memory (bp_tgt->reqstd_address - 2, |
| 1777 | bp_record, |
| 1778 | CSKY_WR_BKPT_MODE * 2); |
| 1779 | } |
| 1780 | } |
| 1781 | } |
| 1782 | |
| 1783 | /* Determine link register type. */ |
| 1784 | |
| 1785 | static lr_type_t |
| 1786 | csky_analyze_lr_type (struct gdbarch *gdbarch, |
| 1787 | CORE_ADDR start_pc, CORE_ADDR end_pc) |
| 1788 | { |
| 1789 | CORE_ADDR addr; |
| 1790 | unsigned int insn, insn_len; |
| 1791 | insn_len = 2; |
| 1792 | |
| 1793 | for (addr = start_pc; addr < end_pc; addr += insn_len) |
| 1794 | { |
| 1795 | insn_len = csky_get_insn (gdbarch, addr, &insn); |
| 1796 | if (insn_len == 4) |
| 1797 | { |
| 1798 | if (CSKY_32_IS_MFCR_EPSR (insn) || CSKY_32_IS_MFCR_EPC (insn) |
| 1799 | || CSKY_32_IS_RTE (insn)) |
| 1800 | return LR_TYPE_EPC; |
| 1801 | } |
| 1802 | else if (CSKY_32_IS_MFCR_FPSR (insn) || CSKY_32_IS_MFCR_FPC (insn) |
| 1803 | || CSKY_32_IS_RFI (insn)) |
| 1804 | return LR_TYPE_FPC; |
| 1805 | else if (CSKY_32_IS_JMP (insn) || CSKY_32_IS_BR (insn) |
| 1806 | || CSKY_32_IS_JMPIX (insn) || CSKY_32_IS_JMPI (insn)) |
| 1807 | return LR_TYPE_R15; |
| 1808 | else |
| 1809 | { |
| 1810 | /* 16 bit instruction. */ |
| 1811 | if (CSKY_16_IS_JMP (insn) || CSKY_16_IS_BR (insn) |
| 1812 | || CSKY_16_IS_JMPIX (insn)) |
| 1813 | return LR_TYPE_R15; |
| 1814 | } |
| 1815 | } |
| 1816 | return LR_TYPE_R15; |
| 1817 | } |
| 1818 | |
| 1819 | /* Heuristic unwinder. */ |
| 1820 | |
| 1821 | static struct csky_unwind_cache * |
| 1822 | csky_frame_unwind_cache (struct frame_info *this_frame) |
| 1823 | { |
| 1824 | CORE_ADDR prologue_start, prologue_end, func_end, prev_pc, block_addr; |
| 1825 | struct csky_unwind_cache *cache; |
| 1826 | const struct block *bl; |
| 1827 | unsigned long func_size = 0; |
| 1828 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 1829 | unsigned int sp_regnum = CSKY_SP_REGNUM; |
| 1830 | |
| 1831 | /* Default lr type is r15. */ |
| 1832 | lr_type_t lr_type = LR_TYPE_R15; |
| 1833 | |
| 1834 | cache = FRAME_OBSTACK_ZALLOC (struct csky_unwind_cache); |
| 1835 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
| 1836 | |
| 1837 | /* Assume there is no frame until proven otherwise. */ |
| 1838 | cache->framereg = sp_regnum; |
| 1839 | |
| 1840 | cache->framesize = 0; |
| 1841 | |
| 1842 | prev_pc = get_frame_pc (this_frame); |
| 1843 | block_addr = get_frame_address_in_block (this_frame); |
| 1844 | if (find_pc_partial_function (block_addr, NULL, &prologue_start, |
| 1845 | &func_end) == 0) |
| 1846 | /* We couldn't find a function containing block_addr, so bail out |
| 1847 | and hope for the best. */ |
| 1848 | return cache; |
| 1849 | |
| 1850 | /* Get the (function) symbol matching prologue_start. */ |
| 1851 | bl = block_for_pc (prologue_start); |
| 1852 | if (bl != NULL) |
| 1853 | func_size = bl->endaddr - bl->startaddr; |
| 1854 | else |
| 1855 | { |
| 1856 | struct bound_minimal_symbol msymbol |
| 1857 | = lookup_minimal_symbol_by_pc (prologue_start); |
| 1858 | if (msymbol.minsym != NULL) |
| 1859 | func_size = MSYMBOL_SIZE (msymbol.minsym); |
| 1860 | } |
| 1861 | |
| 1862 | /* If FUNC_SIZE is 0 we may have a special-case use of lr |
| 1863 | e.g. exception or interrupt. */ |
| 1864 | if (func_size == 0) |
| 1865 | lr_type = csky_analyze_lr_type (gdbarch, prologue_start, func_end); |
| 1866 | |
| 1867 | prologue_end = std::min (func_end, prev_pc); |
| 1868 | |
| 1869 | /* Analyze the function prologue. */ |
| 1870 | csky_analyze_prologue (gdbarch, prologue_start, prologue_end, |
| 1871 | func_end, this_frame, cache, lr_type); |
| 1872 | |
| 1873 | /* gdbarch_sp_regnum contains the value and not the address. */ |
| 1874 | trad_frame_set_value (cache->saved_regs, sp_regnum, cache->prev_sp); |
| 1875 | return cache; |
| 1876 | } |
| 1877 | |
| 1878 | /* Implement the this_id function for the normal unwinder. */ |
| 1879 | |
| 1880 | static void |
| 1881 | csky_frame_this_id (struct frame_info *this_frame, |
| 1882 | void **this_prologue_cache, struct frame_id *this_id) |
| 1883 | { |
| 1884 | struct csky_unwind_cache *cache; |
| 1885 | struct frame_id id; |
| 1886 | |
| 1887 | if (*this_prologue_cache == NULL) |
| 1888 | *this_prologue_cache = csky_frame_unwind_cache (this_frame); |
| 1889 | cache = (struct csky_unwind_cache *) *this_prologue_cache; |
| 1890 | |
| 1891 | /* This marks the outermost frame. */ |
| 1892 | if (cache->prev_sp == 0) |
| 1893 | return; |
| 1894 | |
| 1895 | id = frame_id_build (cache->prev_sp, get_frame_func (this_frame)); |
| 1896 | *this_id = id; |
| 1897 | } |
| 1898 | |
| 1899 | /* Implement the prev_register function for the normal unwinder. */ |
| 1900 | |
| 1901 | static struct value * |
| 1902 | csky_frame_prev_register (struct frame_info *this_frame, |
| 1903 | void **this_prologue_cache, int regnum) |
| 1904 | { |
| 1905 | struct csky_unwind_cache *cache; |
| 1906 | |
| 1907 | if (*this_prologue_cache == NULL) |
| 1908 | *this_prologue_cache = csky_frame_unwind_cache (this_frame); |
| 1909 | cache = (struct csky_unwind_cache *) *this_prologue_cache; |
| 1910 | |
| 1911 | return trad_frame_get_prev_register (this_frame, cache->saved_regs, |
| 1912 | regnum); |
| 1913 | } |
| 1914 | |
| 1915 | /* Data structures for the normal prologue-analysis-based |
| 1916 | unwinder. */ |
| 1917 | |
| 1918 | static const struct frame_unwind csky_unwind_cache = { |
| 1919 | NORMAL_FRAME, |
| 1920 | default_frame_unwind_stop_reason, |
| 1921 | csky_frame_this_id, |
| 1922 | csky_frame_prev_register, |
| 1923 | NULL, |
| 1924 | default_frame_sniffer, |
| 1925 | NULL, |
| 1926 | NULL |
| 1927 | }; |
| 1928 | |
| 1929 | |
| 1930 | |
| 1931 | static int |
| 1932 | csky_stub_unwind_sniffer (const struct frame_unwind *self, |
| 1933 | struct frame_info *this_frame, |
| 1934 | void **this_prologue_cache) |
| 1935 | { |
| 1936 | CORE_ADDR addr_in_block; |
| 1937 | |
| 1938 | addr_in_block = get_frame_address_in_block (this_frame); |
| 1939 | |
| 1940 | if (find_pc_partial_function (addr_in_block, NULL, NULL, NULL) == 0 |
| 1941 | || in_plt_section (addr_in_block)) |
| 1942 | return 1; |
| 1943 | |
| 1944 | return 0; |
| 1945 | } |
| 1946 | |
| 1947 | static struct csky_unwind_cache * |
| 1948 | csky_make_stub_cache (struct frame_info *this_frame) |
| 1949 | { |
| 1950 | struct csky_unwind_cache *cache; |
| 1951 | |
| 1952 | cache = FRAME_OBSTACK_ZALLOC (struct csky_unwind_cache); |
| 1953 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
| 1954 | cache->prev_sp = get_frame_register_unsigned (this_frame, CSKY_SP_REGNUM); |
| 1955 | |
| 1956 | return cache; |
| 1957 | } |
| 1958 | |
| 1959 | static void |
| 1960 | csky_stub_this_id (struct frame_info *this_frame, |
| 1961 | void **this_cache, |
| 1962 | struct frame_id *this_id) |
| 1963 | { |
| 1964 | struct csky_unwind_cache *cache; |
| 1965 | |
| 1966 | if (*this_cache == NULL) |
| 1967 | *this_cache = csky_make_stub_cache (this_frame); |
| 1968 | cache = (struct csky_unwind_cache *) *this_cache; |
| 1969 | |
| 1970 | /* Our frame ID for a stub frame is the current SP and LR. */ |
| 1971 | *this_id = frame_id_build (cache->prev_sp, get_frame_pc (this_frame)); |
| 1972 | } |
| 1973 | |
| 1974 | static struct value * |
| 1975 | csky_stub_prev_register (struct frame_info *this_frame, |
| 1976 | void **this_cache, |
| 1977 | int prev_regnum) |
| 1978 | { |
| 1979 | struct csky_unwind_cache *cache; |
| 1980 | |
| 1981 | if (*this_cache == NULL) |
| 1982 | *this_cache = csky_make_stub_cache (this_frame); |
| 1983 | cache = (struct csky_unwind_cache *) *this_cache; |
| 1984 | |
| 1985 | /* If we are asked to unwind the PC, then return the LR. */ |
| 1986 | if (prev_regnum == CSKY_PC_REGNUM) |
| 1987 | { |
| 1988 | CORE_ADDR lr; |
| 1989 | |
| 1990 | lr = frame_unwind_register_unsigned (this_frame, CSKY_LR_REGNUM); |
| 1991 | return frame_unwind_got_constant (this_frame, prev_regnum, lr); |
| 1992 | } |
| 1993 | |
| 1994 | if (prev_regnum == CSKY_SP_REGNUM) |
| 1995 | return frame_unwind_got_constant (this_frame, prev_regnum, cache->prev_sp); |
| 1996 | |
| 1997 | return trad_frame_get_prev_register (this_frame, cache->saved_regs, |
| 1998 | prev_regnum); |
| 1999 | } |
| 2000 | |
| 2001 | struct frame_unwind csky_stub_unwind = { |
| 2002 | NORMAL_FRAME, |
| 2003 | default_frame_unwind_stop_reason, |
| 2004 | csky_stub_this_id, |
| 2005 | csky_stub_prev_register, |
| 2006 | NULL, |
| 2007 | csky_stub_unwind_sniffer |
| 2008 | }; |
| 2009 | |
| 2010 | /* Implement the this_base, this_locals, and this_args hooks |
| 2011 | for the normal unwinder. */ |
| 2012 | |
| 2013 | static CORE_ADDR |
| 2014 | csky_frame_base_address (struct frame_info *this_frame, void **this_cache) |
| 2015 | { |
| 2016 | struct csky_unwind_cache *cache; |
| 2017 | |
| 2018 | if (*this_cache == NULL) |
| 2019 | *this_cache = csky_frame_unwind_cache (this_frame); |
| 2020 | cache = (struct csky_unwind_cache *) *this_cache; |
| 2021 | |
| 2022 | return cache->prev_sp - cache->framesize; |
| 2023 | } |
| 2024 | |
| 2025 | static const struct frame_base csky_frame_base = { |
| 2026 | &csky_unwind_cache, |
| 2027 | csky_frame_base_address, |
| 2028 | csky_frame_base_address, |
| 2029 | csky_frame_base_address |
| 2030 | }; |
| 2031 | |
| 2032 | /* Initialize register access method. */ |
| 2033 | |
| 2034 | static void |
| 2035 | csky_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, |
| 2036 | struct dwarf2_frame_state_reg *reg, |
| 2037 | struct frame_info *this_frame) |
| 2038 | { |
| 2039 | if (regnum == gdbarch_pc_regnum (gdbarch)) |
| 2040 | reg->how = DWARF2_FRAME_REG_RA; |
| 2041 | else if (regnum == gdbarch_sp_regnum (gdbarch)) |
| 2042 | reg->how = DWARF2_FRAME_REG_CFA; |
| 2043 | } |
| 2044 | |
| 2045 | /* Create csky register groups. */ |
| 2046 | |
| 2047 | static void |
| 2048 | csky_init_reggroup () |
| 2049 | { |
| 2050 | cr_reggroup = reggroup_new ("cr", USER_REGGROUP); |
| 2051 | fr_reggroup = reggroup_new ("fr", USER_REGGROUP); |
| 2052 | vr_reggroup = reggroup_new ("vr", USER_REGGROUP); |
| 2053 | mmu_reggroup = reggroup_new ("mmu", USER_REGGROUP); |
| 2054 | prof_reggroup = reggroup_new ("profiling", USER_REGGROUP); |
| 2055 | } |
| 2056 | |
| 2057 | /* Add register groups into reggroup list. */ |
| 2058 | |
| 2059 | static void |
| 2060 | csky_add_reggroups (struct gdbarch *gdbarch) |
| 2061 | { |
| 2062 | reggroup_add (gdbarch, all_reggroup); |
| 2063 | reggroup_add (gdbarch, general_reggroup); |
| 2064 | reggroup_add (gdbarch, cr_reggroup); |
| 2065 | reggroup_add (gdbarch, fr_reggroup); |
| 2066 | reggroup_add (gdbarch, vr_reggroup); |
| 2067 | reggroup_add (gdbarch, mmu_reggroup); |
| 2068 | reggroup_add (gdbarch, prof_reggroup); |
| 2069 | } |
| 2070 | |
| 2071 | /* Return the groups that a CSKY register can be categorised into. */ |
| 2072 | |
| 2073 | static int |
| 2074 | csky_register_reggroup_p (struct gdbarch *gdbarch, int regnum, |
| 2075 | struct reggroup *reggroup) |
| 2076 | { |
| 2077 | int raw_p; |
| 2078 | |
| 2079 | if (gdbarch_register_name (gdbarch, regnum) == NULL |
| 2080 | || gdbarch_register_name (gdbarch, regnum)[0] == '\0') |
| 2081 | return 0; |
| 2082 | |
| 2083 | if (reggroup == all_reggroup) |
| 2084 | return 1; |
| 2085 | |
| 2086 | raw_p = regnum < gdbarch_num_regs (gdbarch); |
| 2087 | if (reggroup == save_reggroup || reggroup == restore_reggroup) |
| 2088 | return raw_p; |
| 2089 | |
| 2090 | if (((regnum >= CSKY_R0_REGNUM) && (regnum <= CSKY_R0_REGNUM + 31)) |
| 2091 | && (reggroup == general_reggroup)) |
| 2092 | return 1; |
| 2093 | |
| 2094 | if (((regnum == CSKY_PC_REGNUM) |
| 2095 | || ((regnum >= CSKY_CR0_REGNUM) |
| 2096 | && (regnum <= CSKY_CR0_REGNUM + 30))) |
| 2097 | && (reggroup == cr_reggroup)) |
| 2098 | return 2; |
| 2099 | |
| 2100 | if ((((regnum >= CSKY_VR0_REGNUM) && (regnum <= CSKY_VR0_REGNUM + 15)) |
| 2101 | || ((regnum >= CSKY_VCR0_REGNUM) |
| 2102 | && (regnum <= CSKY_VCR0_REGNUM + 2))) |
| 2103 | && (reggroup == vr_reggroup)) |
| 2104 | return 3; |
| 2105 | |
| 2106 | if (((regnum >= CSKY_MMU_REGNUM) && (regnum <= CSKY_MMU_REGNUM + 8)) |
| 2107 | && (reggroup == mmu_reggroup)) |
| 2108 | return 4; |
| 2109 | |
| 2110 | if (((regnum >= CSKY_PROFCR_REGNUM) |
| 2111 | && (regnum <= CSKY_PROFCR_REGNUM + 48)) |
| 2112 | && (reggroup == prof_reggroup)) |
| 2113 | return 5; |
| 2114 | |
| 2115 | if ((((regnum >= CSKY_FR0_REGNUM) && (regnum <= CSKY_FR0_REGNUM + 15)) |
| 2116 | || ((regnum >= CSKY_VCR0_REGNUM) && (regnum <= CSKY_VCR0_REGNUM + 2))) |
| 2117 | && (reggroup == fr_reggroup)) |
| 2118 | return 6; |
| 2119 | |
| 2120 | return 0; |
| 2121 | } |
| 2122 | |
| 2123 | /* Implement the dwarf2_reg_to_regnum gdbarch method. */ |
| 2124 | |
| 2125 | static int |
| 2126 | csky_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int dw_reg) |
| 2127 | { |
| 2128 | if (dw_reg < 0 || dw_reg >= CSKY_NUM_REGS) |
| 2129 | return -1; |
| 2130 | return dw_reg; |
| 2131 | } |
| 2132 | |
| 2133 | /* Override interface for command: info register. */ |
| 2134 | |
| 2135 | static void |
| 2136 | csky_print_registers_info (struct gdbarch *gdbarch, struct ui_file *file, |
| 2137 | struct frame_info *frame, int regnum, int all) |
| 2138 | { |
| 2139 | /* Call default print_registers_info function. */ |
| 2140 | default_print_registers_info (gdbarch, file, frame, regnum, all); |
| 2141 | |
| 2142 | /* For command: info register. */ |
| 2143 | if (regnum == -1 && all == 0) |
| 2144 | { |
| 2145 | default_print_registers_info (gdbarch, file, frame, |
| 2146 | CSKY_PC_REGNUM, 0); |
| 2147 | default_print_registers_info (gdbarch, file, frame, |
| 2148 | CSKY_EPC_REGNUM, 0); |
| 2149 | default_print_registers_info (gdbarch, file, frame, |
| 2150 | CSKY_CR0_REGNUM, 0); |
| 2151 | default_print_registers_info (gdbarch, file, frame, |
| 2152 | CSKY_EPSR_REGNUM, 0); |
| 2153 | } |
| 2154 | return; |
| 2155 | } |
| 2156 | |
| 2157 | /* Initialize the current architecture based on INFO. If possible, |
| 2158 | re-use an architecture from ARCHES, which is a list of |
| 2159 | architectures already created during this debugging session. |
| 2160 | |
| 2161 | Called at program startup, when reading a core file, and when |
| 2162 | reading a binary file. */ |
| 2163 | |
| 2164 | static struct gdbarch * |
| 2165 | csky_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 2166 | { |
| 2167 | struct gdbarch *gdbarch; |
| 2168 | struct gdbarch_tdep *tdep; |
| 2169 | |
| 2170 | /* Find a candidate among the list of pre-declared architectures. */ |
| 2171 | arches = gdbarch_list_lookup_by_info (arches, &info); |
| 2172 | if (arches != NULL) |
| 2173 | return arches->gdbarch; |
| 2174 | |
| 2175 | /* None found, create a new architecture from the information |
| 2176 | provided. */ |
| 2177 | tdep = XCNEW (struct gdbarch_tdep); |
| 2178 | gdbarch = gdbarch_alloc (&info, tdep); |
| 2179 | |
| 2180 | /* Target data types. */ |
| 2181 | set_gdbarch_ptr_bit (gdbarch, 32); |
| 2182 | set_gdbarch_addr_bit (gdbarch, 32); |
| 2183 | set_gdbarch_short_bit (gdbarch, 16); |
| 2184 | set_gdbarch_int_bit (gdbarch, 32); |
| 2185 | set_gdbarch_long_bit (gdbarch, 32); |
| 2186 | set_gdbarch_long_long_bit (gdbarch, 64); |
| 2187 | set_gdbarch_float_bit (gdbarch, 32); |
| 2188 | set_gdbarch_double_bit (gdbarch, 64); |
| 2189 | set_gdbarch_float_format (gdbarch, floatformats_ieee_single); |
| 2190 | set_gdbarch_double_format (gdbarch, floatformats_ieee_double); |
| 2191 | |
| 2192 | /* Information about the target architecture. */ |
| 2193 | set_gdbarch_return_value (gdbarch, csky_return_value); |
| 2194 | set_gdbarch_breakpoint_kind_from_pc (gdbarch, csky_breakpoint_kind_from_pc); |
| 2195 | set_gdbarch_sw_breakpoint_from_kind (gdbarch, csky_sw_breakpoint_from_kind); |
| 2196 | |
| 2197 | /* Register architecture. */ |
| 2198 | set_gdbarch_num_regs (gdbarch, CSKY_NUM_REGS); |
| 2199 | set_gdbarch_pc_regnum (gdbarch, CSKY_PC_REGNUM); |
| 2200 | set_gdbarch_sp_regnum (gdbarch, CSKY_SP_REGNUM); |
| 2201 | set_gdbarch_register_name (gdbarch, csky_register_name); |
| 2202 | set_gdbarch_register_type (gdbarch, csky_register_type); |
| 2203 | set_gdbarch_read_pc (gdbarch, csky_read_pc); |
| 2204 | set_gdbarch_write_pc (gdbarch, csky_write_pc); |
| 2205 | set_gdbarch_print_registers_info (gdbarch, csky_print_registers_info); |
| 2206 | csky_add_reggroups (gdbarch); |
| 2207 | set_gdbarch_register_reggroup_p (gdbarch, csky_register_reggroup_p); |
| 2208 | set_gdbarch_stab_reg_to_regnum (gdbarch, csky_dwarf_reg_to_regnum); |
| 2209 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, csky_dwarf_reg_to_regnum); |
| 2210 | dwarf2_frame_set_init_reg (gdbarch, csky_dwarf2_frame_init_reg); |
| 2211 | |
| 2212 | /* Functions to analyze frames. */ |
| 2213 | frame_base_set_default (gdbarch, &csky_frame_base); |
| 2214 | set_gdbarch_skip_prologue (gdbarch, csky_skip_prologue); |
| 2215 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 2216 | set_gdbarch_frame_align (gdbarch, csky_frame_align); |
| 2217 | set_gdbarch_stack_frame_destroyed_p (gdbarch, csky_stack_frame_destroyed_p); |
| 2218 | |
| 2219 | /* Functions handling dummy frames. */ |
| 2220 | set_gdbarch_push_dummy_call (gdbarch, csky_push_dummy_call); |
| 2221 | |
| 2222 | /* Frame unwinders. Use DWARF debug info if available, |
| 2223 | otherwise use our own unwinder. */ |
| 2224 | dwarf2_append_unwinders (gdbarch); |
| 2225 | frame_unwind_append_unwinder (gdbarch, &csky_stub_unwind); |
| 2226 | frame_unwind_append_unwinder (gdbarch, &csky_unwind_cache); |
| 2227 | |
| 2228 | /* Breakpoints. */ |
| 2229 | set_gdbarch_memory_insert_breakpoint (gdbarch, |
| 2230 | csky_memory_insert_breakpoint); |
| 2231 | set_gdbarch_memory_remove_breakpoint (gdbarch, |
| 2232 | csky_memory_remove_breakpoint); |
| 2233 | |
| 2234 | /* Hook in ABI-specific overrides, if they have been registered. */ |
| 2235 | gdbarch_init_osabi (info, gdbarch); |
| 2236 | |
| 2237 | /* Support simple overlay manager. */ |
| 2238 | set_gdbarch_overlay_update (gdbarch, simple_overlay_update); |
| 2239 | set_gdbarch_char_signed (gdbarch, 0); |
| 2240 | return gdbarch; |
| 2241 | } |
| 2242 | |
| 2243 | void |
| 2244 | _initialize_csky_tdep (void) |
| 2245 | { |
| 2246 | |
| 2247 | register_gdbarch_init (bfd_arch_csky, csky_gdbarch_init); |
| 2248 | |
| 2249 | csky_init_reggroup (); |
| 2250 | |
| 2251 | /* Allow debugging this file's internals. */ |
| 2252 | add_setshow_boolean_cmd ("csky", class_maintenance, &csky_debug, |
| 2253 | _("Set C-Sky debugging."), |
| 2254 | _("Show C-Sky debugging."), |
| 2255 | _("When on, C-Sky specific debugging is enabled."), |
| 2256 | NULL, |
| 2257 | NULL, |
| 2258 | &setdebuglist, &showdebuglist); |
| 2259 | } |