| 1 | /* Target dependent code for GDB on TI C6x systems. |
| 2 | |
| 3 | Copyright (C) 2010-2015 Free Software Foundation, Inc. |
| 4 | Contributed by Andrew Jenner <andrew@codesourcery.com> |
| 5 | Contributed by Yao Qi <yao@codesourcery.com> |
| 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 "frame.h" |
| 24 | #include "frame-unwind.h" |
| 25 | #include "frame-base.h" |
| 26 | #include "trad-frame.h" |
| 27 | #include "dwarf2-frame.h" |
| 28 | #include "symtab.h" |
| 29 | #include "inferior.h" |
| 30 | #include "gdbtypes.h" |
| 31 | #include "gdbcore.h" |
| 32 | #include "gdbcmd.h" |
| 33 | #include "target.h" |
| 34 | #include "dis-asm.h" |
| 35 | #include "regcache.h" |
| 36 | #include "value.h" |
| 37 | #include "symfile.h" |
| 38 | #include "arch-utils.h" |
| 39 | #include "floatformat.h" |
| 40 | #include "glibc-tdep.h" |
| 41 | #include "infcall.h" |
| 42 | #include "regset.h" |
| 43 | #include "tramp-frame.h" |
| 44 | #include "linux-tdep.h" |
| 45 | #include "solib.h" |
| 46 | #include "objfiles.h" |
| 47 | #include "osabi.h" |
| 48 | #include "tic6x-tdep.h" |
| 49 | #include "language.h" |
| 50 | #include "target-descriptions.h" |
| 51 | |
| 52 | #include "features/tic6x-c64xp.c" |
| 53 | #include "features/tic6x-c64x.c" |
| 54 | #include "features/tic6x-c62x.c" |
| 55 | |
| 56 | #define TIC6X_OPCODE_SIZE 4 |
| 57 | #define TIC6X_FETCH_PACKET_SIZE 32 |
| 58 | |
| 59 | #define INST_S_BIT(INST) ((INST >> 1) & 1) |
| 60 | #define INST_X_BIT(INST) ((INST >> 12) & 1) |
| 61 | |
| 62 | const gdb_byte tic6x_bkpt_illegal_opcode_be[] = { 0x56, 0x45, 0x43, 0x14 }; |
| 63 | const gdb_byte tic6x_bkpt_illegal_opcode_le[] = { 0x14, 0x43, 0x45, 0x56 }; |
| 64 | |
| 65 | struct tic6x_unwind_cache |
| 66 | { |
| 67 | /* The frame's base, optionally used by the high-level debug info. */ |
| 68 | CORE_ADDR base; |
| 69 | |
| 70 | /* The previous frame's inner most stack address. Used as this |
| 71 | frame ID's stack_addr. */ |
| 72 | CORE_ADDR cfa; |
| 73 | |
| 74 | /* The address of the first instruction in this function */ |
| 75 | CORE_ADDR pc; |
| 76 | |
| 77 | /* Which register holds the return address for the frame. */ |
| 78 | int return_regnum; |
| 79 | |
| 80 | /* The offset of register saved on stack. If register is not saved, the |
| 81 | corresponding element is -1. */ |
| 82 | CORE_ADDR reg_saved[TIC6X_NUM_CORE_REGS]; |
| 83 | }; |
| 84 | |
| 85 | |
| 86 | /* Name of TI C6x core registers. */ |
| 87 | static const char *const tic6x_register_names[] = |
| 88 | { |
| 89 | "A0", "A1", "A2", "A3", /* 0 1 2 3 */ |
| 90 | "A4", "A5", "A6", "A7", /* 4 5 6 7 */ |
| 91 | "A8", "A9", "A10", "A11", /* 8 9 10 11 */ |
| 92 | "A12", "A13", "A14", "A15", /* 12 13 14 15 */ |
| 93 | "B0", "B1", "B2", "B3", /* 16 17 18 19 */ |
| 94 | "B4", "B5", "B6", "B7", /* 20 21 22 23 */ |
| 95 | "B8", "B9", "B10", "B11", /* 24 25 26 27 */ |
| 96 | "B12", "B13", "B14", "B15", /* 28 29 30 31 */ |
| 97 | "CSR", "PC", /* 32 33 */ |
| 98 | }; |
| 99 | |
| 100 | /* This array maps the arguments to the register number which passes argument |
| 101 | in function call according to C6000 ELF ABI. */ |
| 102 | static const int arg_regs[] = { 4, 20, 6, 22, 8, 24, 10, 26, 12, 28 }; |
| 103 | |
| 104 | /* This is the implementation of gdbarch method register_name. */ |
| 105 | |
| 106 | static const char * |
| 107 | tic6x_register_name (struct gdbarch *gdbarch, int regno) |
| 108 | { |
| 109 | if (regno < 0) |
| 110 | return NULL; |
| 111 | |
| 112 | if (tdesc_has_registers (gdbarch_target_desc (gdbarch))) |
| 113 | return tdesc_register_name (gdbarch, regno); |
| 114 | else if (regno >= ARRAY_SIZE (tic6x_register_names)) |
| 115 | return ""; |
| 116 | else |
| 117 | return tic6x_register_names[regno]; |
| 118 | } |
| 119 | |
| 120 | /* This is the implementation of gdbarch method register_type. */ |
| 121 | |
| 122 | static struct type * |
| 123 | tic6x_register_type (struct gdbarch *gdbarch, int regno) |
| 124 | { |
| 125 | |
| 126 | if (regno == TIC6X_PC_REGNUM) |
| 127 | return builtin_type (gdbarch)->builtin_func_ptr; |
| 128 | else |
| 129 | return builtin_type (gdbarch)->builtin_uint32; |
| 130 | } |
| 131 | |
| 132 | static void |
| 133 | tic6x_setup_default (struct tic6x_unwind_cache *cache) |
| 134 | { |
| 135 | int i; |
| 136 | |
| 137 | for (i = 0; i < TIC6X_NUM_CORE_REGS; i++) |
| 138 | cache->reg_saved[i] = -1; |
| 139 | } |
| 140 | |
| 141 | static unsigned long tic6x_fetch_instruction (struct gdbarch *, CORE_ADDR); |
| 142 | static int tic6x_register_number (int reg, int side, int crosspath); |
| 143 | |
| 144 | /* Do a full analysis of the prologue at START_PC and update CACHE accordingly. |
| 145 | Bail out early if CURRENT_PC is reached. Returns the address of the first |
| 146 | instruction after the prologue. */ |
| 147 | |
| 148 | static CORE_ADDR |
| 149 | tic6x_analyze_prologue (struct gdbarch *gdbarch, const CORE_ADDR start_pc, |
| 150 | const CORE_ADDR current_pc, |
| 151 | struct tic6x_unwind_cache *cache, |
| 152 | struct frame_info *this_frame) |
| 153 | { |
| 154 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 155 | unsigned long inst; |
| 156 | unsigned int src_reg, base_reg, dst_reg; |
| 157 | int i; |
| 158 | CORE_ADDR pc = start_pc; |
| 159 | CORE_ADDR return_pc = start_pc; |
| 160 | int frame_base_offset_to_sp = 0; |
| 161 | /* Counter of non-stw instructions after first insn ` sub sp, xxx, sp'. */ |
| 162 | int non_stw_insn_counter = 0; |
| 163 | |
| 164 | if (start_pc >= current_pc) |
| 165 | return_pc = current_pc; |
| 166 | |
| 167 | cache->base = 0; |
| 168 | |
| 169 | /* The landmarks in prologue is one or two SUB instructions to SP. |
| 170 | Instructions on setting up dsbt are in the last part of prologue, if |
| 171 | needed. In maxim, prologue can be divided to three parts by two |
| 172 | `sub sp, xx, sp' insns. */ |
| 173 | |
| 174 | /* Step 1: Look for the 1st and 2nd insn `sub sp, xx, sp', in which, the |
| 175 | 2nd one is optional. */ |
| 176 | while (pc < current_pc) |
| 177 | { |
| 178 | int offset = 0; |
| 179 | |
| 180 | unsigned long inst = tic6x_fetch_instruction (gdbarch, pc); |
| 181 | |
| 182 | if ((inst & 0x1ffc) == 0x1dc0 || (inst & 0x1ffc) == 0x1bc0 |
| 183 | || (inst & 0x0ffc) == 0x9c0) |
| 184 | { |
| 185 | /* SUBAW/SUBAH/SUB, and src1 is ucst 5. */ |
| 186 | unsigned int src2 = tic6x_register_number ((inst >> 18) & 0x1f, |
| 187 | INST_S_BIT (inst), 0); |
| 188 | unsigned int dst = tic6x_register_number ((inst >> 23) & 0x1f, |
| 189 | INST_S_BIT (inst), 0); |
| 190 | |
| 191 | if (src2 == TIC6X_SP_REGNUM && dst == TIC6X_SP_REGNUM) |
| 192 | { |
| 193 | /* Extract const from insn SUBAW/SUBAH/SUB, and translate it to |
| 194 | offset. The constant offset is decoded in bit 13-17 in all |
| 195 | these three kinds of instructions. */ |
| 196 | unsigned int ucst5 = (inst >> 13) & 0x1f; |
| 197 | |
| 198 | if ((inst & 0x1ffc) == 0x1dc0) /* SUBAW */ |
| 199 | frame_base_offset_to_sp += ucst5 << 2; |
| 200 | else if ((inst & 0x1ffc) == 0x1bc0) /* SUBAH */ |
| 201 | frame_base_offset_to_sp += ucst5 << 1; |
| 202 | else if ((inst & 0x0ffc) == 0x9c0) /* SUB */ |
| 203 | frame_base_offset_to_sp += ucst5; |
| 204 | else |
| 205 | gdb_assert_not_reached ("unexpected instruction"); |
| 206 | |
| 207 | return_pc = pc + 4; |
| 208 | } |
| 209 | } |
| 210 | else if ((inst & 0x174) == 0x74) /* stw SRC, *+b15(uconst) */ |
| 211 | { |
| 212 | /* The y bit determines which file base is read from. */ |
| 213 | base_reg = tic6x_register_number ((inst >> 18) & 0x1f, |
| 214 | (inst >> 7) & 1, 0); |
| 215 | |
| 216 | if (base_reg == TIC6X_SP_REGNUM) |
| 217 | { |
| 218 | src_reg = tic6x_register_number ((inst >> 23) & 0x1f, |
| 219 | INST_S_BIT (inst), 0); |
| 220 | |
| 221 | cache->reg_saved[src_reg] = ((inst >> 13) & 0x1f) << 2; |
| 222 | |
| 223 | return_pc = pc + 4; |
| 224 | } |
| 225 | non_stw_insn_counter = 0; |
| 226 | } |
| 227 | else |
| 228 | { |
| 229 | non_stw_insn_counter++; |
| 230 | /* Following instruction sequence may be emitted in prologue: |
| 231 | |
| 232 | <+0>: subah .D2 b15,28,b15 |
| 233 | <+4>: or .L2X 0,a4,b0 |
| 234 | <+8>: || stw .D2T2 b14,*+b15(56) |
| 235 | <+12>:[!b0] b .S1 0xe50e4c1c <sleep+220> |
| 236 | <+16>:|| stw .D2T1 a10,*+b15(48) |
| 237 | <+20>:stw .D2T2 b3,*+b15(52) |
| 238 | <+24>:stw .D2T1 a4,*+b15(40) |
| 239 | |
| 240 | we should look forward for next instruction instead of breaking loop |
| 241 | here. So far, we allow almost two sequential non-stw instructions |
| 242 | in prologue. */ |
| 243 | if (non_stw_insn_counter >= 2) |
| 244 | break; |
| 245 | } |
| 246 | |
| 247 | |
| 248 | pc += 4; |
| 249 | } |
| 250 | /* Step 2: Skip insn on setting up dsbt if it is. Usually, it looks like, |
| 251 | ldw .D2T2 *+b14(0),b14 */ |
| 252 | inst = tic6x_fetch_instruction (gdbarch, pc); |
| 253 | /* The s bit determines which file dst will be loaded into, same effect as |
| 254 | other places. */ |
| 255 | dst_reg = tic6x_register_number ((inst >> 23) & 0x1f, (inst >> 1) & 1, 0); |
| 256 | /* The y bit (bit 7), instead of s bit, determines which file base be |
| 257 | used. */ |
| 258 | base_reg = tic6x_register_number ((inst >> 18) & 0x1f, (inst >> 7) & 1, 0); |
| 259 | |
| 260 | if ((inst & 0x164) == 0x64 /* ldw */ |
| 261 | && dst_reg == TIC6X_DP_REGNUM /* dst is B14 */ |
| 262 | && base_reg == TIC6X_DP_REGNUM) /* baseR is B14 */ |
| 263 | { |
| 264 | return_pc = pc + 4; |
| 265 | } |
| 266 | |
| 267 | if (this_frame) |
| 268 | { |
| 269 | cache->base = get_frame_register_unsigned (this_frame, TIC6X_SP_REGNUM); |
| 270 | |
| 271 | if (cache->reg_saved[TIC6X_FP_REGNUM] != -1) |
| 272 | { |
| 273 | /* If the FP now holds an offset from the CFA then this is a frame |
| 274 | which uses the frame pointer. */ |
| 275 | |
| 276 | cache->cfa = get_frame_register_unsigned (this_frame, |
| 277 | TIC6X_FP_REGNUM); |
| 278 | } |
| 279 | else |
| 280 | { |
| 281 | /* FP doesn't hold an offset from the CFA. If SP still holds an |
| 282 | offset from the CFA then we might be in a function which omits |
| 283 | the frame pointer. */ |
| 284 | |
| 285 | cache->cfa = cache->base + frame_base_offset_to_sp; |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | /* Adjust all the saved registers such that they contain addresses |
| 290 | instead of offsets. */ |
| 291 | for (i = 0; i < TIC6X_NUM_CORE_REGS; i++) |
| 292 | if (cache->reg_saved[i] != -1) |
| 293 | cache->reg_saved[i] = cache->base + cache->reg_saved[i]; |
| 294 | |
| 295 | return return_pc; |
| 296 | } |
| 297 | |
| 298 | /* This is the implementation of gdbarch method skip_prologue. */ |
| 299 | |
| 300 | static CORE_ADDR |
| 301 | tic6x_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc) |
| 302 | { |
| 303 | CORE_ADDR func_addr; |
| 304 | struct tic6x_unwind_cache cache; |
| 305 | |
| 306 | /* See if we can determine the end of the prologue via the symbol table. |
| 307 | If so, then return either PC, or the PC after the prologue, whichever is |
| 308 | greater. */ |
| 309 | if (find_pc_partial_function (start_pc, NULL, &func_addr, NULL)) |
| 310 | { |
| 311 | CORE_ADDR post_prologue_pc |
| 312 | = skip_prologue_using_sal (gdbarch, func_addr); |
| 313 | if (post_prologue_pc != 0) |
| 314 | return max (start_pc, post_prologue_pc); |
| 315 | } |
| 316 | |
| 317 | /* Can't determine prologue from the symbol table, need to examine |
| 318 | instructions. */ |
| 319 | return tic6x_analyze_prologue (gdbarch, start_pc, (CORE_ADDR) -1, &cache, |
| 320 | NULL); |
| 321 | } |
| 322 | |
| 323 | /* This is the implementation of gdbarch method breakpiont_from_pc. */ |
| 324 | |
| 325 | static const gdb_byte * |
| 326 | tic6x_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *bp_addr, |
| 327 | int *bp_size) |
| 328 | { |
| 329 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 330 | |
| 331 | *bp_size = 4; |
| 332 | |
| 333 | if (tdep == NULL || tdep->breakpoint == NULL) |
| 334 | { |
| 335 | if (BFD_ENDIAN_BIG == gdbarch_byte_order_for_code (gdbarch)) |
| 336 | return tic6x_bkpt_illegal_opcode_be; |
| 337 | else |
| 338 | return tic6x_bkpt_illegal_opcode_le; |
| 339 | } |
| 340 | else |
| 341 | return tdep->breakpoint; |
| 342 | } |
| 343 | |
| 344 | /* This is the implementation of gdbarch method print_insn. */ |
| 345 | |
| 346 | static int |
| 347 | tic6x_print_insn (bfd_vma memaddr, disassemble_info *info) |
| 348 | { |
| 349 | return print_insn_tic6x (memaddr, info); |
| 350 | } |
| 351 | |
| 352 | static void |
| 353 | tic6x_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, |
| 354 | struct dwarf2_frame_state_reg *reg, |
| 355 | struct frame_info *this_frame) |
| 356 | { |
| 357 | /* Mark the PC as the destination for the return address. */ |
| 358 | if (regnum == gdbarch_pc_regnum (gdbarch)) |
| 359 | reg->how = DWARF2_FRAME_REG_RA; |
| 360 | |
| 361 | /* Mark the stack pointer as the call frame address. */ |
| 362 | else if (regnum == gdbarch_sp_regnum (gdbarch)) |
| 363 | reg->how = DWARF2_FRAME_REG_CFA; |
| 364 | |
| 365 | /* The above was taken from the default init_reg in dwarf2-frame.c |
| 366 | while the below is c6x specific. */ |
| 367 | |
| 368 | /* Callee save registers. The ABI designates A10-A15 and B10-B15 as |
| 369 | callee-save. */ |
| 370 | else if ((regnum >= 10 && regnum <= 15) || (regnum >= 26 && regnum <= 31)) |
| 371 | reg->how = DWARF2_FRAME_REG_SAME_VALUE; |
| 372 | else |
| 373 | /* All other registers are caller-save. */ |
| 374 | reg->how = DWARF2_FRAME_REG_UNDEFINED; |
| 375 | } |
| 376 | |
| 377 | /* This is the implementation of gdbarch method unwind_pc. */ |
| 378 | |
| 379 | static CORE_ADDR |
| 380 | tic6x_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 381 | { |
| 382 | gdb_byte buf[8]; |
| 383 | |
| 384 | frame_unwind_register (next_frame, TIC6X_PC_REGNUM, buf); |
| 385 | return extract_typed_address (buf, builtin_type (gdbarch)->builtin_func_ptr); |
| 386 | } |
| 387 | |
| 388 | /* This is the implementation of gdbarch method unwind_sp. */ |
| 389 | |
| 390 | static CORE_ADDR |
| 391 | tic6x_unwind_sp (struct gdbarch *gdbarch, struct frame_info *this_frame) |
| 392 | { |
| 393 | return frame_unwind_register_unsigned (this_frame, TIC6X_SP_REGNUM); |
| 394 | } |
| 395 | |
| 396 | |
| 397 | /* Frame base handling. */ |
| 398 | |
| 399 | static struct tic6x_unwind_cache* |
| 400 | tic6x_frame_unwind_cache (struct frame_info *this_frame, |
| 401 | void **this_prologue_cache) |
| 402 | { |
| 403 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 404 | CORE_ADDR current_pc; |
| 405 | struct tic6x_unwind_cache *cache; |
| 406 | |
| 407 | if (*this_prologue_cache) |
| 408 | return *this_prologue_cache; |
| 409 | |
| 410 | cache = FRAME_OBSTACK_ZALLOC (struct tic6x_unwind_cache); |
| 411 | (*this_prologue_cache) = cache; |
| 412 | |
| 413 | cache->return_regnum = TIC6X_RA_REGNUM; |
| 414 | |
| 415 | tic6x_setup_default (cache); |
| 416 | |
| 417 | cache->pc = get_frame_func (this_frame); |
| 418 | current_pc = get_frame_pc (this_frame); |
| 419 | |
| 420 | /* Prologue analysis does the rest... */ |
| 421 | if (cache->pc != 0) |
| 422 | tic6x_analyze_prologue (gdbarch, cache->pc, current_pc, cache, this_frame); |
| 423 | |
| 424 | return cache; |
| 425 | } |
| 426 | |
| 427 | static void |
| 428 | tic6x_frame_this_id (struct frame_info *this_frame, void **this_cache, |
| 429 | struct frame_id *this_id) |
| 430 | { |
| 431 | struct tic6x_unwind_cache *cache = |
| 432 | tic6x_frame_unwind_cache (this_frame, this_cache); |
| 433 | |
| 434 | /* This marks the outermost frame. */ |
| 435 | if (cache->base == 0) |
| 436 | return; |
| 437 | |
| 438 | (*this_id) = frame_id_build (cache->cfa, cache->pc); |
| 439 | } |
| 440 | |
| 441 | static struct value * |
| 442 | tic6x_frame_prev_register (struct frame_info *this_frame, void **this_cache, |
| 443 | int regnum) |
| 444 | { |
| 445 | struct tic6x_unwind_cache *cache = |
| 446 | tic6x_frame_unwind_cache (this_frame, this_cache); |
| 447 | |
| 448 | gdb_assert (regnum >= 0); |
| 449 | |
| 450 | /* The PC of the previous frame is stored in the RA register of |
| 451 | the current frame. Frob regnum so that we pull the value from |
| 452 | the correct place. */ |
| 453 | if (regnum == TIC6X_PC_REGNUM) |
| 454 | regnum = cache->return_regnum; |
| 455 | |
| 456 | if (regnum == TIC6X_SP_REGNUM && cache->cfa) |
| 457 | return frame_unwind_got_constant (this_frame, regnum, cache->cfa); |
| 458 | |
| 459 | /* If we've worked out where a register is stored then load it from |
| 460 | there. */ |
| 461 | if (regnum < TIC6X_NUM_CORE_REGS && cache->reg_saved[regnum] != -1) |
| 462 | return frame_unwind_got_memory (this_frame, regnum, |
| 463 | cache->reg_saved[regnum]); |
| 464 | |
| 465 | return frame_unwind_got_register (this_frame, regnum, regnum); |
| 466 | } |
| 467 | |
| 468 | static CORE_ADDR |
| 469 | tic6x_frame_base_address (struct frame_info *this_frame, void **this_cache) |
| 470 | { |
| 471 | struct tic6x_unwind_cache *info |
| 472 | = tic6x_frame_unwind_cache (this_frame, this_cache); |
| 473 | return info->base; |
| 474 | } |
| 475 | |
| 476 | static const struct frame_unwind tic6x_frame_unwind = |
| 477 | { |
| 478 | NORMAL_FRAME, |
| 479 | default_frame_unwind_stop_reason, |
| 480 | tic6x_frame_this_id, |
| 481 | tic6x_frame_prev_register, |
| 482 | NULL, |
| 483 | default_frame_sniffer |
| 484 | }; |
| 485 | |
| 486 | static const struct frame_base tic6x_frame_base = |
| 487 | { |
| 488 | &tic6x_frame_unwind, |
| 489 | tic6x_frame_base_address, |
| 490 | tic6x_frame_base_address, |
| 491 | tic6x_frame_base_address |
| 492 | }; |
| 493 | |
| 494 | |
| 495 | static struct tic6x_unwind_cache * |
| 496 | tic6x_make_stub_cache (struct frame_info *this_frame) |
| 497 | { |
| 498 | struct tic6x_unwind_cache *cache; |
| 499 | |
| 500 | cache = FRAME_OBSTACK_ZALLOC (struct tic6x_unwind_cache); |
| 501 | |
| 502 | cache->return_regnum = TIC6X_RA_REGNUM; |
| 503 | |
| 504 | tic6x_setup_default (cache); |
| 505 | |
| 506 | cache->cfa = get_frame_register_unsigned (this_frame, TIC6X_SP_REGNUM); |
| 507 | |
| 508 | return cache; |
| 509 | } |
| 510 | |
| 511 | static void |
| 512 | tic6x_stub_this_id (struct frame_info *this_frame, void **this_cache, |
| 513 | struct frame_id *this_id) |
| 514 | { |
| 515 | struct tic6x_unwind_cache *cache; |
| 516 | |
| 517 | if (*this_cache == NULL) |
| 518 | *this_cache = tic6x_make_stub_cache (this_frame); |
| 519 | cache = *this_cache; |
| 520 | |
| 521 | *this_id = frame_id_build (cache->cfa, get_frame_pc (this_frame)); |
| 522 | } |
| 523 | |
| 524 | static int |
| 525 | tic6x_stub_unwind_sniffer (const struct frame_unwind *self, |
| 526 | struct frame_info *this_frame, |
| 527 | void **this_prologue_cache) |
| 528 | { |
| 529 | CORE_ADDR addr_in_block; |
| 530 | |
| 531 | addr_in_block = get_frame_address_in_block (this_frame); |
| 532 | if (in_plt_section (addr_in_block)) |
| 533 | return 1; |
| 534 | |
| 535 | return 0; |
| 536 | } |
| 537 | |
| 538 | static const struct frame_unwind tic6x_stub_unwind = |
| 539 | { |
| 540 | NORMAL_FRAME, |
| 541 | default_frame_unwind_stop_reason, |
| 542 | tic6x_stub_this_id, |
| 543 | tic6x_frame_prev_register, |
| 544 | NULL, |
| 545 | tic6x_stub_unwind_sniffer |
| 546 | }; |
| 547 | |
| 548 | /* Return the instruction on address PC. */ |
| 549 | |
| 550 | static unsigned long |
| 551 | tic6x_fetch_instruction (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 552 | { |
| 553 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 554 | return read_memory_unsigned_integer (pc, TIC6X_OPCODE_SIZE, byte_order); |
| 555 | } |
| 556 | |
| 557 | /* Compute the condition of INST if it is a conditional instruction. Always |
| 558 | return 1 if INST is not a conditional instruction. */ |
| 559 | |
| 560 | static int |
| 561 | tic6x_condition_true (struct frame_info *frame, unsigned long inst) |
| 562 | { |
| 563 | int register_number; |
| 564 | int register_value; |
| 565 | static const int register_numbers[8] = { -1, 16, 17, 18, 1, 2, 0, -1 }; |
| 566 | |
| 567 | register_number = register_numbers[(inst >> 29) & 7]; |
| 568 | if (register_number == -1) |
| 569 | return 1; |
| 570 | |
| 571 | register_value = get_frame_register_signed (frame, register_number); |
| 572 | if ((inst & 0x10000000) != 0) |
| 573 | return register_value == 0; |
| 574 | return register_value != 0; |
| 575 | } |
| 576 | |
| 577 | /* Get the register number by decoding raw bits REG, SIDE, and CROSSPATH in |
| 578 | instruction. */ |
| 579 | |
| 580 | static int |
| 581 | tic6x_register_number (int reg, int side, int crosspath) |
| 582 | { |
| 583 | int r = (reg & 15) | ((crosspath ^ side) << 4); |
| 584 | if ((reg & 16) != 0) /* A16 - A31, B16 - B31 */ |
| 585 | r += 37; |
| 586 | return r; |
| 587 | } |
| 588 | |
| 589 | static int |
| 590 | tic6x_extract_signed_field (int value, int low_bit, int bits) |
| 591 | { |
| 592 | int mask = (1 << bits) - 1; |
| 593 | int r = (value >> low_bit) & mask; |
| 594 | if ((r & (1 << (bits - 1))) != 0) |
| 595 | r -= mask + 1; |
| 596 | return r; |
| 597 | } |
| 598 | |
| 599 | /* Determine where to set a single step breakpoint. */ |
| 600 | |
| 601 | static CORE_ADDR |
| 602 | tic6x_get_next_pc (struct frame_info *frame, CORE_ADDR pc) |
| 603 | { |
| 604 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 605 | unsigned long inst; |
| 606 | int register_number; |
| 607 | int last = 0; |
| 608 | |
| 609 | do |
| 610 | { |
| 611 | inst = tic6x_fetch_instruction (gdbarch, pc); |
| 612 | |
| 613 | last = !(inst & 1); |
| 614 | |
| 615 | if (inst == TIC6X_INST_SWE) |
| 616 | { |
| 617 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 618 | |
| 619 | if (tdep->syscall_next_pc != NULL) |
| 620 | return tdep->syscall_next_pc (frame); |
| 621 | } |
| 622 | |
| 623 | if (tic6x_condition_true (frame, inst)) |
| 624 | { |
| 625 | if ((inst & 0x0000007c) == 0x00000010) |
| 626 | { |
| 627 | /* B with displacement */ |
| 628 | pc &= ~(TIC6X_FETCH_PACKET_SIZE - 1); |
| 629 | pc += tic6x_extract_signed_field (inst, 7, 21) << 2; |
| 630 | break; |
| 631 | } |
| 632 | if ((inst & 0x0f83effc) == 0x00000360) |
| 633 | { |
| 634 | /* B with register */ |
| 635 | |
| 636 | register_number = tic6x_register_number ((inst >> 18) & 0x1f, |
| 637 | INST_S_BIT (inst), |
| 638 | INST_X_BIT (inst)); |
| 639 | pc = get_frame_register_unsigned (frame, register_number); |
| 640 | break; |
| 641 | } |
| 642 | if ((inst & 0x00001ffc) == 0x00001020) |
| 643 | { |
| 644 | /* BDEC */ |
| 645 | register_number = tic6x_register_number ((inst >> 23) & 0x1f, |
| 646 | INST_S_BIT (inst), 0); |
| 647 | if (get_frame_register_signed (frame, register_number) >= 0) |
| 648 | { |
| 649 | pc &= ~(TIC6X_FETCH_PACKET_SIZE - 1); |
| 650 | pc += tic6x_extract_signed_field (inst, 7, 10) << 2; |
| 651 | } |
| 652 | break; |
| 653 | } |
| 654 | if ((inst & 0x00001ffc) == 0x00000120) |
| 655 | { |
| 656 | /* BNOP with displacement */ |
| 657 | pc &= ~(TIC6X_FETCH_PACKET_SIZE - 1); |
| 658 | pc += tic6x_extract_signed_field (inst, 16, 12) << 2; |
| 659 | break; |
| 660 | } |
| 661 | if ((inst & 0x0f830ffe) == 0x00800362) |
| 662 | { |
| 663 | /* BNOP with register */ |
| 664 | register_number = tic6x_register_number ((inst >> 18) & 0x1f, |
| 665 | 1, INST_X_BIT (inst)); |
| 666 | pc = get_frame_register_unsigned (frame, register_number); |
| 667 | break; |
| 668 | } |
| 669 | if ((inst & 0x00001ffc) == 0x00000020) |
| 670 | { |
| 671 | /* BPOS */ |
| 672 | register_number = tic6x_register_number ((inst >> 23) & 0x1f, |
| 673 | INST_S_BIT (inst), 0); |
| 674 | if (get_frame_register_signed (frame, register_number) >= 0) |
| 675 | { |
| 676 | pc &= ~(TIC6X_FETCH_PACKET_SIZE - 1); |
| 677 | pc += tic6x_extract_signed_field (inst, 13, 10) << 2; |
| 678 | } |
| 679 | break; |
| 680 | } |
| 681 | if ((inst & 0xf000007c) == 0x10000010) |
| 682 | { |
| 683 | /* CALLP */ |
| 684 | pc &= ~(TIC6X_FETCH_PACKET_SIZE - 1); |
| 685 | pc += tic6x_extract_signed_field (inst, 7, 21) << 2; |
| 686 | break; |
| 687 | } |
| 688 | } |
| 689 | pc += TIC6X_OPCODE_SIZE; |
| 690 | } |
| 691 | while (!last); |
| 692 | return pc; |
| 693 | } |
| 694 | |
| 695 | /* This is the implementation of gdbarch method software_single_step. */ |
| 696 | |
| 697 | static int |
| 698 | tic6x_software_single_step (struct frame_info *frame) |
| 699 | { |
| 700 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 701 | struct address_space *aspace = get_frame_address_space (frame); |
| 702 | CORE_ADDR next_pc = tic6x_get_next_pc (frame, get_frame_pc (frame)); |
| 703 | |
| 704 | insert_single_step_breakpoint (gdbarch, aspace, next_pc); |
| 705 | |
| 706 | return 1; |
| 707 | } |
| 708 | |
| 709 | /* This is the implementation of gdbarch method frame_align. */ |
| 710 | |
| 711 | static CORE_ADDR |
| 712 | tic6x_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr) |
| 713 | { |
| 714 | return align_down (addr, 8); |
| 715 | } |
| 716 | |
| 717 | /* Given a return value in REGCACHE with a type VALTYPE, extract and copy its |
| 718 | value into VALBUF. */ |
| 719 | |
| 720 | static void |
| 721 | tic6x_extract_return_value (struct type *valtype, struct regcache *regcache, |
| 722 | enum bfd_endian byte_order, gdb_byte *valbuf) |
| 723 | { |
| 724 | int len = TYPE_LENGTH (valtype); |
| 725 | |
| 726 | /* pointer types are returned in register A4, |
| 727 | up to 32-bit types in A4 |
| 728 | up to 64-bit types in A5:A4 */ |
| 729 | if (len <= 4) |
| 730 | { |
| 731 | /* In big-endian, |
| 732 | - one-byte structure or union occupies the LSB of single even register. |
| 733 | - for two-byte structure or union, the first byte occupies byte 1 of |
| 734 | register and the second byte occupies byte 0. |
| 735 | so, we read the contents in VAL from the LSBs of register. */ |
| 736 | if (len < 3 && byte_order == BFD_ENDIAN_BIG) |
| 737 | regcache_cooked_read_part (regcache, TIC6X_A4_REGNUM, 4 - len, len, |
| 738 | valbuf); |
| 739 | else |
| 740 | regcache_cooked_read (regcache, TIC6X_A4_REGNUM, valbuf); |
| 741 | } |
| 742 | else if (len <= 8) |
| 743 | { |
| 744 | /* For a 5-8 byte structure or union in big-endian, the first byte |
| 745 | occupies byte 3 (the MSB) of the upper (odd) register and the |
| 746 | remaining bytes fill the decreasingly significant bytes. 5-7 |
| 747 | byte structures or unions have padding in the LSBs of the |
| 748 | lower (even) register. */ |
| 749 | if (byte_order == BFD_ENDIAN_BIG) |
| 750 | { |
| 751 | regcache_cooked_read (regcache, TIC6X_A4_REGNUM, valbuf + 4); |
| 752 | regcache_cooked_read (regcache, TIC6X_A5_REGNUM, valbuf); |
| 753 | } |
| 754 | else |
| 755 | { |
| 756 | regcache_cooked_read (regcache, TIC6X_A4_REGNUM, valbuf); |
| 757 | regcache_cooked_read (regcache, TIC6X_A5_REGNUM, valbuf + 4); |
| 758 | } |
| 759 | } |
| 760 | } |
| 761 | |
| 762 | /* Write into appropriate registers a function return value |
| 763 | of type TYPE, given in virtual format. */ |
| 764 | |
| 765 | static void |
| 766 | tic6x_store_return_value (struct type *valtype, struct regcache *regcache, |
| 767 | enum bfd_endian byte_order, const gdb_byte *valbuf) |
| 768 | { |
| 769 | int len = TYPE_LENGTH (valtype); |
| 770 | |
| 771 | /* return values of up to 8 bytes are returned in A5:A4 */ |
| 772 | |
| 773 | if (len <= 4) |
| 774 | { |
| 775 | if (len < 3 && byte_order == BFD_ENDIAN_BIG) |
| 776 | regcache_cooked_write_part (regcache, TIC6X_A4_REGNUM, 4 - len, len, |
| 777 | valbuf); |
| 778 | else |
| 779 | regcache_cooked_write (regcache, TIC6X_A4_REGNUM, valbuf); |
| 780 | } |
| 781 | else if (len <= 8) |
| 782 | { |
| 783 | if (byte_order == BFD_ENDIAN_BIG) |
| 784 | { |
| 785 | regcache_cooked_write (regcache, TIC6X_A4_REGNUM, valbuf + 4); |
| 786 | regcache_cooked_write (regcache, TIC6X_A5_REGNUM, valbuf); |
| 787 | } |
| 788 | else |
| 789 | { |
| 790 | regcache_cooked_write (regcache, TIC6X_A4_REGNUM, valbuf); |
| 791 | regcache_cooked_write (regcache, TIC6X_A5_REGNUM, valbuf + 4); |
| 792 | } |
| 793 | } |
| 794 | } |
| 795 | |
| 796 | /* This is the implementation of gdbarch method return_value. */ |
| 797 | |
| 798 | static enum return_value_convention |
| 799 | tic6x_return_value (struct gdbarch *gdbarch, struct value *function, |
| 800 | struct type *type, struct regcache *regcache, |
| 801 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 802 | { |
| 803 | /* In C++, when function returns an object, even its size is small |
| 804 | enough, it stii has to be passed via reference, pointed by register |
| 805 | A3. */ |
| 806 | if (current_language->la_language == language_cplus) |
| 807 | { |
| 808 | if (type != NULL) |
| 809 | { |
| 810 | type = check_typedef (type); |
| 811 | if (language_pass_by_reference (type)) |
| 812 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 813 | } |
| 814 | } |
| 815 | |
| 816 | if (TYPE_LENGTH (type) > 8) |
| 817 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 818 | |
| 819 | if (readbuf) |
| 820 | tic6x_extract_return_value (type, regcache, |
| 821 | gdbarch_byte_order (gdbarch), readbuf); |
| 822 | if (writebuf) |
| 823 | tic6x_store_return_value (type, regcache, |
| 824 | gdbarch_byte_order (gdbarch), writebuf); |
| 825 | |
| 826 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 827 | } |
| 828 | |
| 829 | /* This is the implementation of gdbarch method dummy_id. */ |
| 830 | |
| 831 | static struct frame_id |
| 832 | tic6x_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
| 833 | { |
| 834 | return frame_id_build |
| 835 | (get_frame_register_unsigned (this_frame, TIC6X_SP_REGNUM), |
| 836 | get_frame_pc (this_frame)); |
| 837 | } |
| 838 | |
| 839 | /* Get the alignment requirement of TYPE. */ |
| 840 | |
| 841 | static int |
| 842 | tic6x_arg_type_alignment (struct type *type) |
| 843 | { |
| 844 | int len = TYPE_LENGTH (check_typedef (type)); |
| 845 | enum type_code typecode = TYPE_CODE (check_typedef (type)); |
| 846 | |
| 847 | if (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION) |
| 848 | { |
| 849 | /* The stack alignment of a structure (and union) passed by value is the |
| 850 | smallest power of two greater than or equal to its size. |
| 851 | This cannot exceed 8 bytes, which is the largest allowable size for |
| 852 | a structure passed by value. */ |
| 853 | |
| 854 | if (len <= 2) |
| 855 | return len; |
| 856 | else if (len <= 4) |
| 857 | return 4; |
| 858 | else if (len <= 8) |
| 859 | return 8; |
| 860 | else |
| 861 | gdb_assert_not_reached ("unexpected length of data"); |
| 862 | } |
| 863 | else |
| 864 | { |
| 865 | if (len <= 4) |
| 866 | return 4; |
| 867 | else if (len == 8) |
| 868 | { |
| 869 | if (typecode == TYPE_CODE_COMPLEX) |
| 870 | return 4; |
| 871 | else |
| 872 | return 8; |
| 873 | } |
| 874 | else if (len == 16) |
| 875 | { |
| 876 | if (typecode == TYPE_CODE_COMPLEX) |
| 877 | return 8; |
| 878 | else |
| 879 | return 16; |
| 880 | } |
| 881 | else |
| 882 | internal_error (__FILE__, __LINE__, _("unexpected length %d of type"), |
| 883 | len); |
| 884 | } |
| 885 | } |
| 886 | |
| 887 | /* This is the implementation of gdbarch method push_dummy_call. */ |
| 888 | |
| 889 | static CORE_ADDR |
| 890 | tic6x_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
| 891 | struct regcache *regcache, CORE_ADDR bp_addr, |
| 892 | int nargs, struct value **args, CORE_ADDR sp, |
| 893 | int struct_return, CORE_ADDR struct_addr) |
| 894 | { |
| 895 | int argreg = 0; |
| 896 | int argnum; |
| 897 | int stack_offset = 4; |
| 898 | int references_offset = 4; |
| 899 | CORE_ADDR func_addr = find_function_addr (function, NULL); |
| 900 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 901 | struct type *func_type = value_type (function); |
| 902 | /* The first arg passed on stack. Mostly the first 10 args are passed by |
| 903 | registers. */ |
| 904 | int first_arg_on_stack = 10; |
| 905 | |
| 906 | /* Set the return address register to point to the entry point of |
| 907 | the program, where a breakpoint lies in wait. */ |
| 908 | regcache_cooked_write_unsigned (regcache, TIC6X_RA_REGNUM, bp_addr); |
| 909 | |
| 910 | /* The caller must pass an argument in A3 containing a destination address |
| 911 | for the returned value. The callee returns the object by copying it to |
| 912 | the address in A3. */ |
| 913 | if (struct_return) |
| 914 | regcache_cooked_write_unsigned (regcache, 3, struct_addr); |
| 915 | |
| 916 | /* Determine the type of this function. */ |
| 917 | func_type = check_typedef (func_type); |
| 918 | if (TYPE_CODE (func_type) == TYPE_CODE_PTR) |
| 919 | func_type = check_typedef (TYPE_TARGET_TYPE (func_type)); |
| 920 | |
| 921 | gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC |
| 922 | || TYPE_CODE (func_type) == TYPE_CODE_METHOD); |
| 923 | |
| 924 | /* For a variadic C function, the last explicitly declared argument and all |
| 925 | remaining arguments are passed on the stack. */ |
| 926 | if (TYPE_VARARGS (func_type)) |
| 927 | first_arg_on_stack = TYPE_NFIELDS (func_type) - 1; |
| 928 | |
| 929 | /* Now make space on the stack for the args. */ |
| 930 | for (argnum = 0; argnum < nargs; argnum++) |
| 931 | { |
| 932 | int len = align_up (TYPE_LENGTH (value_type (args[argnum])), 4); |
| 933 | if (argnum >= 10 - argreg) |
| 934 | references_offset += len; |
| 935 | stack_offset += len; |
| 936 | } |
| 937 | sp -= stack_offset; |
| 938 | /* SP should be 8-byte aligned, see C6000 ABI section 4.4.1 |
| 939 | Stack Alignment. */ |
| 940 | sp = align_down (sp, 8); |
| 941 | stack_offset = 4; |
| 942 | |
| 943 | /* Now load as many as possible of the first arguments into |
| 944 | registers, and push the rest onto the stack. Loop through args |
| 945 | from first to last. */ |
| 946 | for (argnum = 0; argnum < nargs; argnum++) |
| 947 | { |
| 948 | const gdb_byte *val; |
| 949 | struct value *arg = args[argnum]; |
| 950 | struct type *arg_type = check_typedef (value_type (arg)); |
| 951 | int len = TYPE_LENGTH (arg_type); |
| 952 | enum type_code typecode = TYPE_CODE (arg_type); |
| 953 | |
| 954 | val = value_contents (arg); |
| 955 | |
| 956 | /* Copy the argument to general registers or the stack in |
| 957 | register-sized pieces. */ |
| 958 | if (argreg < first_arg_on_stack) |
| 959 | { |
| 960 | if (len <= 4) |
| 961 | { |
| 962 | if (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION) |
| 963 | { |
| 964 | /* In big-endian, |
| 965 | - one-byte structure or union occupies the LSB of single |
| 966 | even register. |
| 967 | - for two-byte structure or union, the first byte |
| 968 | occupies byte 1 of register and the second byte occupies |
| 969 | byte 0. |
| 970 | so, we write the contents in VAL to the lsp of |
| 971 | register. */ |
| 972 | if (len < 3 && byte_order == BFD_ENDIAN_BIG) |
| 973 | regcache_cooked_write_part (regcache, arg_regs[argreg], |
| 974 | 4 - len, len, val); |
| 975 | else |
| 976 | regcache_cooked_write (regcache, arg_regs[argreg], val); |
| 977 | } |
| 978 | else |
| 979 | { |
| 980 | /* The argument is being passed by value in a single |
| 981 | register. */ |
| 982 | CORE_ADDR regval = extract_unsigned_integer (val, len, |
| 983 | byte_order); |
| 984 | |
| 985 | regcache_cooked_write_unsigned (regcache, arg_regs[argreg], |
| 986 | regval); |
| 987 | } |
| 988 | } |
| 989 | else |
| 990 | { |
| 991 | if (len <= 8) |
| 992 | { |
| 993 | if (typecode == TYPE_CODE_STRUCT |
| 994 | || typecode == TYPE_CODE_UNION) |
| 995 | { |
| 996 | /* For a 5-8 byte structure or union in big-endian, the |
| 997 | first byte occupies byte 3 (the MSB) of the upper (odd) |
| 998 | register and the remaining bytes fill the decreasingly |
| 999 | significant bytes. 5-7 byte structures or unions have |
| 1000 | padding in the LSBs of the lower (even) register. */ |
| 1001 | if (byte_order == BFD_ENDIAN_BIG) |
| 1002 | { |
| 1003 | regcache_cooked_write (regcache, |
| 1004 | arg_regs[argreg] + 1, val); |
| 1005 | regcache_cooked_write_part (regcache, |
| 1006 | arg_regs[argreg], 0, |
| 1007 | len - 4, val + 4); |
| 1008 | } |
| 1009 | else |
| 1010 | { |
| 1011 | regcache_cooked_write (regcache, arg_regs[argreg], |
| 1012 | val); |
| 1013 | regcache_cooked_write_part (regcache, |
| 1014 | arg_regs[argreg] + 1, 0, |
| 1015 | len - 4, val + 4); |
| 1016 | } |
| 1017 | } |
| 1018 | else |
| 1019 | { |
| 1020 | /* The argument is being passed by value in a pair of |
| 1021 | registers. */ |
| 1022 | ULONGEST regval = extract_unsigned_integer (val, len, |
| 1023 | byte_order); |
| 1024 | |
| 1025 | regcache_cooked_write_unsigned (regcache, |
| 1026 | arg_regs[argreg], |
| 1027 | regval); |
| 1028 | regcache_cooked_write_unsigned (regcache, |
| 1029 | arg_regs[argreg] + 1, |
| 1030 | regval >> 32); |
| 1031 | } |
| 1032 | } |
| 1033 | else |
| 1034 | { |
| 1035 | /* The argument is being passed by reference in a single |
| 1036 | register. */ |
| 1037 | CORE_ADDR addr; |
| 1038 | |
| 1039 | /* It is not necessary to adjust REFERENCES_OFFSET to |
| 1040 | 8-byte aligned in some cases, in which 4-byte alignment |
| 1041 | is sufficient. For simplicity, we adjust |
| 1042 | REFERENCES_OFFSET to 8-byte aligned. */ |
| 1043 | references_offset = align_up (references_offset, 8); |
| 1044 | |
| 1045 | addr = sp + references_offset; |
| 1046 | write_memory (addr, val, len); |
| 1047 | references_offset += align_up (len, 4); |
| 1048 | regcache_cooked_write_unsigned (regcache, arg_regs[argreg], |
| 1049 | addr); |
| 1050 | } |
| 1051 | } |
| 1052 | argreg++; |
| 1053 | } |
| 1054 | else |
| 1055 | { |
| 1056 | /* The argument is being passed on the stack. */ |
| 1057 | CORE_ADDR addr; |
| 1058 | |
| 1059 | /* There are six different cases of alignment, and these rules can |
| 1060 | be found in tic6x_arg_type_alignment: |
| 1061 | |
| 1062 | 1) 4-byte aligned if size is less than or equal to 4 byte, such |
| 1063 | as short, int, struct, union etc. |
| 1064 | 2) 8-byte aligned if size is less than or equal to 8-byte, such |
| 1065 | as double, long long, |
| 1066 | 3) 4-byte aligned if it is of type _Complex float, even its size |
| 1067 | is 8-byte. |
| 1068 | 4) 8-byte aligned if it is of type _Complex double or _Complex |
| 1069 | long double, even its size is 16-byte. Because, the address of |
| 1070 | variable is passed as reference. |
| 1071 | 5) struct and union larger than 8-byte are passed by reference, so |
| 1072 | it is 4-byte aligned. |
| 1073 | 6) struct and union of size between 4 byte and 8 byte varies. |
| 1074 | alignment of struct variable is the alignment of its first field, |
| 1075 | while alignment of union variable is the max of all its fields' |
| 1076 | alignment. */ |
| 1077 | |
| 1078 | if (len <= 4) |
| 1079 | ; /* Default is 4-byte aligned. Nothing to be done. */ |
| 1080 | else if (len <= 8) |
| 1081 | stack_offset = align_up (stack_offset, |
| 1082 | tic6x_arg_type_alignment (arg_type)); |
| 1083 | else if (len == 16) |
| 1084 | { |
| 1085 | /* _Complex double or _Complex long double */ |
| 1086 | if (typecode == TYPE_CODE_COMPLEX) |
| 1087 | { |
| 1088 | /* The argument is being passed by reference on stack. */ |
| 1089 | CORE_ADDR addr; |
| 1090 | references_offset = align_up (references_offset, 8); |
| 1091 | |
| 1092 | addr = sp + references_offset; |
| 1093 | /* Store variable on stack. */ |
| 1094 | write_memory (addr, val, len); |
| 1095 | |
| 1096 | references_offset += align_up (len, 4); |
| 1097 | |
| 1098 | /* Pass the address of variable on stack as reference. */ |
| 1099 | store_unsigned_integer ((gdb_byte *) val, 4, byte_order, |
| 1100 | addr); |
| 1101 | len = 4; |
| 1102 | |
| 1103 | } |
| 1104 | else |
| 1105 | internal_error (__FILE__, __LINE__, |
| 1106 | _("unexpected type %d of arg %d"), |
| 1107 | typecode, argnum); |
| 1108 | } |
| 1109 | else |
| 1110 | internal_error (__FILE__, __LINE__, |
| 1111 | _("unexpected length %d of arg %d"), len, argnum); |
| 1112 | |
| 1113 | addr = sp + stack_offset; |
| 1114 | write_memory (addr, val, len); |
| 1115 | stack_offset += align_up (len, 4); |
| 1116 | } |
| 1117 | } |
| 1118 | |
| 1119 | regcache_cooked_write_signed (regcache, TIC6X_SP_REGNUM, sp); |
| 1120 | |
| 1121 | /* Return adjusted stack pointer. */ |
| 1122 | return sp; |
| 1123 | } |
| 1124 | |
| 1125 | /* This is the implementation of gdbarch method stack_frame_destroyed_p. */ |
| 1126 | |
| 1127 | static int |
| 1128 | tic6x_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 1129 | { |
| 1130 | unsigned long inst = tic6x_fetch_instruction (gdbarch, pc); |
| 1131 | /* Normally, the epilogue is composed by instruction `b .S2 b3'. */ |
| 1132 | if ((inst & 0x0f83effc) == 0x360) |
| 1133 | { |
| 1134 | unsigned int src2 = tic6x_register_number ((inst >> 18) & 0x1f, |
| 1135 | INST_S_BIT (inst), |
| 1136 | INST_X_BIT (inst)); |
| 1137 | if (src2 == TIC6X_RA_REGNUM) |
| 1138 | return 1; |
| 1139 | } |
| 1140 | |
| 1141 | return 0; |
| 1142 | } |
| 1143 | |
| 1144 | /* This is the implementation of gdbarch method get_longjmp_target. */ |
| 1145 | |
| 1146 | static int |
| 1147 | tic6x_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
| 1148 | { |
| 1149 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 1150 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 1151 | CORE_ADDR jb_addr; |
| 1152 | gdb_byte buf[4]; |
| 1153 | |
| 1154 | /* JMP_BUF is passed by reference in A4. */ |
| 1155 | jb_addr = get_frame_register_unsigned (frame, 4); |
| 1156 | |
| 1157 | /* JMP_BUF contains 13 elements of type int, and return address is stored |
| 1158 | in the last slot. */ |
| 1159 | if (target_read_memory (jb_addr + 12 * 4, buf, 4)) |
| 1160 | return 0; |
| 1161 | |
| 1162 | *pc = extract_unsigned_integer (buf, 4, byte_order); |
| 1163 | |
| 1164 | return 1; |
| 1165 | } |
| 1166 | |
| 1167 | /* This is the implementation of gdbarch method |
| 1168 | return_in_first_hidden_param_p. */ |
| 1169 | |
| 1170 | static int |
| 1171 | tic6x_return_in_first_hidden_param_p (struct gdbarch *gdbarch, |
| 1172 | struct type *type) |
| 1173 | { |
| 1174 | return 0; |
| 1175 | } |
| 1176 | |
| 1177 | static struct gdbarch * |
| 1178 | tic6x_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 1179 | { |
| 1180 | struct gdbarch *gdbarch; |
| 1181 | struct gdbarch_tdep *tdep; |
| 1182 | struct tdesc_arch_data *tdesc_data = NULL; |
| 1183 | const struct target_desc *tdesc = info.target_desc; |
| 1184 | int has_gp = 0; |
| 1185 | |
| 1186 | /* Check any target description for validity. */ |
| 1187 | if (tdesc_has_registers (tdesc)) |
| 1188 | { |
| 1189 | const struct tdesc_feature *feature; |
| 1190 | int valid_p, i; |
| 1191 | |
| 1192 | feature = tdesc_find_feature (tdesc, "org.gnu.gdb.tic6x.core"); |
| 1193 | |
| 1194 | if (feature == NULL) |
| 1195 | return NULL; |
| 1196 | |
| 1197 | tdesc_data = tdesc_data_alloc (); |
| 1198 | |
| 1199 | valid_p = 1; |
| 1200 | for (i = 0; i < 32; i++) /* A0 - A15, B0 - B15 */ |
| 1201 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, |
| 1202 | tic6x_register_names[i]); |
| 1203 | |
| 1204 | /* CSR */ |
| 1205 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i++, |
| 1206 | tic6x_register_names[TIC6X_CSR_REGNUM]); |
| 1207 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i++, |
| 1208 | tic6x_register_names[TIC6X_PC_REGNUM]); |
| 1209 | |
| 1210 | if (!valid_p) |
| 1211 | { |
| 1212 | tdesc_data_cleanup (tdesc_data); |
| 1213 | return NULL; |
| 1214 | } |
| 1215 | |
| 1216 | feature = tdesc_find_feature (tdesc, "org.gnu.gdb.tic6x.gp"); |
| 1217 | if (feature) |
| 1218 | { |
| 1219 | int j = 0; |
| 1220 | static const char *const gp[] = |
| 1221 | { |
| 1222 | "A16", "A17", "A18", "A19", "A20", "A21", "A22", "A23", |
| 1223 | "A24", "A25", "A26", "A27", "A28", "A29", "A30", "A31", |
| 1224 | "B16", "B17", "B18", "B19", "B20", "B21", "B22", "B23", |
| 1225 | "B24", "B25", "B26", "B27", "B28", "B29", "B30", "B31", |
| 1226 | }; |
| 1227 | |
| 1228 | has_gp = 1; |
| 1229 | valid_p = 1; |
| 1230 | for (j = 0; j < 32; j++) /* A16 - A31, B16 - B31 */ |
| 1231 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i++, |
| 1232 | gp[j]); |
| 1233 | |
| 1234 | if (!valid_p) |
| 1235 | { |
| 1236 | tdesc_data_cleanup (tdesc_data); |
| 1237 | return NULL; |
| 1238 | } |
| 1239 | } |
| 1240 | |
| 1241 | feature = tdesc_find_feature (tdesc, "org.gnu.gdb.tic6x.c6xp"); |
| 1242 | if (feature) |
| 1243 | { |
| 1244 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i++, "TSR"); |
| 1245 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i++, "ILC"); |
| 1246 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i++, "RILC"); |
| 1247 | |
| 1248 | if (!valid_p) |
| 1249 | { |
| 1250 | tdesc_data_cleanup (tdesc_data); |
| 1251 | return NULL; |
| 1252 | } |
| 1253 | } |
| 1254 | |
| 1255 | } |
| 1256 | |
| 1257 | /* Find a candidate among extant architectures. */ |
| 1258 | for (arches = gdbarch_list_lookup_by_info (arches, &info); |
| 1259 | arches != NULL; |
| 1260 | arches = gdbarch_list_lookup_by_info (arches->next, &info)) |
| 1261 | { |
| 1262 | tdep = gdbarch_tdep (arches->gdbarch); |
| 1263 | |
| 1264 | if (has_gp != tdep->has_gp) |
| 1265 | continue; |
| 1266 | |
| 1267 | if (tdep && tdep->breakpoint) |
| 1268 | return arches->gdbarch; |
| 1269 | } |
| 1270 | |
| 1271 | tdep = xcalloc (1, sizeof (struct gdbarch_tdep)); |
| 1272 | |
| 1273 | tdep->has_gp = has_gp; |
| 1274 | gdbarch = gdbarch_alloc (&info, tdep); |
| 1275 | |
| 1276 | /* Data type sizes. */ |
| 1277 | set_gdbarch_ptr_bit (gdbarch, 32); |
| 1278 | set_gdbarch_addr_bit (gdbarch, 32); |
| 1279 | set_gdbarch_short_bit (gdbarch, 16); |
| 1280 | set_gdbarch_int_bit (gdbarch, 32); |
| 1281 | set_gdbarch_long_bit (gdbarch, 32); |
| 1282 | set_gdbarch_long_long_bit (gdbarch, 64); |
| 1283 | set_gdbarch_float_bit (gdbarch, 32); |
| 1284 | set_gdbarch_double_bit (gdbarch, 64); |
| 1285 | |
| 1286 | set_gdbarch_float_format (gdbarch, floatformats_ieee_single); |
| 1287 | set_gdbarch_double_format (gdbarch, floatformats_ieee_double); |
| 1288 | |
| 1289 | /* The register set. */ |
| 1290 | set_gdbarch_num_regs (gdbarch, TIC6X_NUM_REGS); |
| 1291 | set_gdbarch_sp_regnum (gdbarch, TIC6X_SP_REGNUM); |
| 1292 | set_gdbarch_pc_regnum (gdbarch, TIC6X_PC_REGNUM); |
| 1293 | |
| 1294 | set_gdbarch_register_name (gdbarch, tic6x_register_name); |
| 1295 | set_gdbarch_register_type (gdbarch, tic6x_register_type); |
| 1296 | |
| 1297 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 1298 | |
| 1299 | set_gdbarch_skip_prologue (gdbarch, tic6x_skip_prologue); |
| 1300 | set_gdbarch_breakpoint_from_pc (gdbarch, tic6x_breakpoint_from_pc); |
| 1301 | |
| 1302 | set_gdbarch_unwind_pc (gdbarch, tic6x_unwind_pc); |
| 1303 | set_gdbarch_unwind_sp (gdbarch, tic6x_unwind_sp); |
| 1304 | |
| 1305 | /* Unwinding. */ |
| 1306 | dwarf2_append_unwinders (gdbarch); |
| 1307 | |
| 1308 | frame_unwind_append_unwinder (gdbarch, &tic6x_stub_unwind); |
| 1309 | frame_unwind_append_unwinder (gdbarch, &tic6x_frame_unwind); |
| 1310 | frame_base_set_default (gdbarch, &tic6x_frame_base); |
| 1311 | |
| 1312 | dwarf2_frame_set_init_reg (gdbarch, tic6x_dwarf2_frame_init_reg); |
| 1313 | |
| 1314 | /* Single stepping. */ |
| 1315 | set_gdbarch_software_single_step (gdbarch, tic6x_software_single_step); |
| 1316 | |
| 1317 | set_gdbarch_print_insn (gdbarch, tic6x_print_insn); |
| 1318 | |
| 1319 | /* Call dummy code. */ |
| 1320 | set_gdbarch_frame_align (gdbarch, tic6x_frame_align); |
| 1321 | |
| 1322 | set_gdbarch_return_value (gdbarch, tic6x_return_value); |
| 1323 | |
| 1324 | set_gdbarch_dummy_id (gdbarch, tic6x_dummy_id); |
| 1325 | |
| 1326 | /* Enable inferior call support. */ |
| 1327 | set_gdbarch_push_dummy_call (gdbarch, tic6x_push_dummy_call); |
| 1328 | |
| 1329 | set_gdbarch_get_longjmp_target (gdbarch, tic6x_get_longjmp_target); |
| 1330 | |
| 1331 | set_gdbarch_stack_frame_destroyed_p (gdbarch, tic6x_stack_frame_destroyed_p); |
| 1332 | |
| 1333 | set_gdbarch_return_in_first_hidden_param_p (gdbarch, |
| 1334 | tic6x_return_in_first_hidden_param_p); |
| 1335 | |
| 1336 | /* Hook in ABI-specific overrides, if they have been registered. */ |
| 1337 | gdbarch_init_osabi (info, gdbarch); |
| 1338 | |
| 1339 | if (tdesc_data) |
| 1340 | tdesc_use_registers (gdbarch, tdesc, tdesc_data); |
| 1341 | |
| 1342 | return gdbarch; |
| 1343 | } |
| 1344 | |
| 1345 | /* -Wmissing-prototypes */ |
| 1346 | extern initialize_file_ftype _initialize_tic6x_tdep; |
| 1347 | |
| 1348 | void |
| 1349 | _initialize_tic6x_tdep (void) |
| 1350 | { |
| 1351 | register_gdbarch_init (bfd_arch_tic6x, tic6x_gdbarch_init); |
| 1352 | |
| 1353 | initialize_tdesc_tic6x_c64xp (); |
| 1354 | initialize_tdesc_tic6x_c64x (); |
| 1355 | initialize_tdesc_tic6x_c62x (); |
| 1356 | } |