diff options
Diffstat (limited to 'input_bin.c')
| -rw-r--r-- | input_bin.c | 176 |
1 files changed, 0 insertions, 176 deletions
diff --git a/input_bin.c b/input_bin.c deleted file mode 100644 index c914cd1..0000000 --- a/input_bin.c +++ /dev/null @@ -1,176 +0,0 @@ -#include <stdio.h> -#include <stdint.h> -#include <stdlib.h> -#include <errno.h> - -#include "parse.h" - -static void disasm_rtype(uint16_t i, uint16_t unused, struct instruction *inst) -{ - (void)unused; - inst->type = INST_TYPE_R; - inst->inst.r.oper = GET_OPER(i); - inst->inst.r.dest = GET_REG_DEST(i); - inst->inst.r.left = GET_REG_LEFT(i); - inst->inst.r.right = GET_REG_RIGHT(i); -} - -static void disasm_nitype(uint16_t i, uint16_t unused, struct instruction *inst) -{ - (void)unused; - inst->type = INST_TYPE_NI; - inst->inst.i.oper = GET_OPER(i); - inst->inst.i.dest = GET_REG_DEST(i); - inst->inst.i.left = GET_REG_LEFT(i); - inst->inst.i.imm.value = GET_NI_IMM(i); - inst->inst.i.imm_is_ident = 0; -} - -static void disasm_witype(uint16_t i, uint16_t imm, struct instruction *inst) -{ - inst->type = INST_TYPE_WI; - inst->inst.i.oper = GET_OPER(i); - inst->inst.i.dest = GET_REG_DEST(i); - inst->inst.i.left = GET_REG_LEFT(i); - inst->inst.i.imm.value = imm; - inst->inst.i.imm_is_ident = 0; -} - -static void disasm_jreg(uint16_t i, uint16_t unused, struct instruction *inst) -{ - (void)unused; - inst->type = INST_TYPE_JR; - inst->inst.jr.cond = GET_JB_COND(i); - inst->inst.jr.reg = GET_JUMP_REG(i); -} - -static void disasm_jimm(uint16_t i, uint16_t imm, struct instruction *inst) -{ - inst->type = INST_TYPE_JI; - inst->inst.ji.cond= GET_JB_COND(i); - inst->inst.ji.imm.value = imm; - inst->inst.ji.imm_is_ident = 0; -} - -static void disasm_bimm(uint16_t i, uint16_t pc, struct instruction *inst) -{ - struct { signed int s:10; } sign; - int offset = sign.s = GET_B_OFFSET(i); - inst->type = INST_TYPE_B; - inst->inst.b.cond = GET_JB_COND(i); - inst->inst.b.imm.value = pc + 2 * offset; - inst->inst.b.imm_is_ident = 0; -} - - -/** - * FIXME move and factor out with parse.c */ -static struct instruction *insts = NULL; -static size_t insts_count = 0; -static int add_instruction(struct instruction inst) -{ - struct instruction *old_insts = insts; - insts = realloc(insts, (insts_count + 1) * sizeof(struct instruction)); - if (!insts) { - free(old_insts); - perror("realloc"); - return 1; - } - - insts[insts_count] = inst; - - insts_count++; - return 0; -} - - - -/* FIXME needs whatsit arguments. f, tok, tok length */ -static int disasm_file(FILE *f) -{ - int ret = 0; - size_t offs = 0; - uint16_t inst = 0; - uint8_t c[2] = { 0 }; - size_t extra_read = 0; - uint16_t extra_arg = 0; - struct instruction i = { 0 }; - void (*disasm_inst)(uint16_t, uint16_t, struct instruction*); - - while (!feof(f) && fread(c, sizeof(c), 1, f) == 1) { - extra_read = 0; - inst = c[0] << 8 | c[1]; - switch (GET_INST_TYPE(inst)) { - case INST_TYPE_RTYPE: - disasm_inst = disasm_rtype; - break; - case INST_TYPE_NITYPE: - disasm_inst = disasm_nitype; - break; - case INST_TYPE_WITYPE: - if (fread(c, sizeof(c), 1, f) != 1) { - ret = -errno; - break; - } - extra_read = sizeof(c); - extra_arg = c[0] << 16 | c[1]; - disasm_inst = disasm_witype; - break; - case INST_TYPE_JTYPE: - /* J Type can be split into three further subtypes: - * - branch (always immediate, 2 bytes) - * - jump reg (2 bytes) - * - jump immediate (4 bytes) - */ - if (inst & MASK_IS_BRANCH) { - disasm_inst = disasm_bimm; - extra_arg = offs; - } else { - if (inst & MASK_JR) { - disasm_inst = disasm_jreg; - } else { - if (fread(c, sizeof(c), 1, f) != 1) { - ret = -errno; - break; - } - extra_arg = c[0] << 16 | c[1]; - extra_read = sizeof(c); - disasm_inst = disasm_jimm; - } - } - break; - default: - printf("Unhandled instruction at byte %zd\n", offs); - ret = -1; - break; - } - /* Fall out of loop if picking a handler errored */ - if (ret) { - break; - } - disasm_inst(inst, extra_arg, &i); - if (ret < 0) { - fprintf(stderr, "Error handling instruction at byte %zd\n", offs); - break; - } - if (add_instruction(i)) - return 1; - offs += sizeof(c) + extra_read; - } - if (!feof(f)) { - perror("fread"); - ret = -errno; - } - return ret; -} - -int disasm(FILE *f, struct instruction **i, size_t *i_count) -{ - int ret = 0; - - ret = disasm_file(f); - *i = insts; - *i_count = insts_count; - - return ret; -} |