Executes the next instruction on the list */
| 368 | |
| 369 | /* Executes the next instruction on the list */ |
| 370 | static int |
| 371 | unwind_exec_insn(struct unwind_state *state) |
| 372 | { |
| 373 | unsigned int insn; |
| 374 | uint32_t *vsp = (uint32_t *)state->registers[SP]; |
| 375 | int update_vsp = 0; |
| 376 | |
| 377 | /* This should never happen */ |
| 378 | if (state->entries == 0) |
| 379 | return 1; |
| 380 | |
| 381 | /* Read the next instruction */ |
| 382 | insn = unwind_exec_read_byte(state); |
| 383 | |
| 384 | if ((insn & INSN_VSP_MASK) == INSN_VSP_INC) { |
| 385 | state->registers[SP] += ((insn & INSN_VSP_SIZE_MASK) << 2) + 4; |
| 386 | |
| 387 | } else if ((insn & INSN_VSP_MASK) == INSN_VSP_DEC) { |
| 388 | state->registers[SP] -= ((insn & INSN_VSP_SIZE_MASK) << 2) + 4; |
| 389 | |
| 390 | } else if ((insn & INSN_STD_MASK) == INSN_POP_MASKED) { |
| 391 | unsigned int mask, reg; |
| 392 | |
| 393 | /* Load the mask */ |
| 394 | mask = unwind_exec_read_byte(state); |
| 395 | mask |= (insn & INSN_STD_DATA_MASK) << 8; |
| 396 | |
| 397 | /* We have a refuse to unwind instruction */ |
| 398 | if (mask == 0) |
| 399 | return 1; |
| 400 | |
| 401 | /* Update SP */ |
| 402 | update_vsp = 1; |
| 403 | |
| 404 | /* Load the registers */ |
| 405 | for (reg = 4; mask && reg < 16; mask >>= 1, reg++) { |
| 406 | if (mask & 1) { |
| 407 | state->registers[reg] = *vsp++; |
| 408 | state->update_mask |= 1 << reg; |
| 409 | |
| 410 | /* If we have updated SP kep its value */ |
| 411 | if (reg == SP) |
| 412 | update_vsp = 0; |
| 413 | } |
| 414 | } |
| 415 | |
| 416 | } else if ((insn & INSN_STD_MASK) == INSN_VSP_REG && |
| 417 | ((insn & INSN_STD_DATA_MASK) != 13) && |
| 418 | ((insn & INSN_STD_DATA_MASK) != 15)) { |
| 419 | /* sp = register */ |
| 420 | state->registers[SP] = |
| 421 | state->registers[insn & INSN_STD_DATA_MASK]; |
| 422 | |
| 423 | } else if ((insn & INSN_STD_MASK) == INSN_POP_COUNT) { |
| 424 | unsigned int count, reg; |
| 425 | |
| 426 | /* Read how many registers to load */ |
| 427 | count = insn & INSN_POP_COUNT_MASK; |
no test coverage detected