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/* $OpenBSD: disasm.c,v 1.1 2024/11/19 05:50:41 anton Exp $ */
#include <stddef.h> /* size_t */
#include <stdio.h>
#include <string.h>
#include "disasm.h"
#define test(instr, exp) \
test_impl((instr), sizeof(instr) - 1, \
(exp), sizeof(exp) - 1, \
__func__, __LINE__)
struct db_disasm_context *ctx = NULL;
static int
test_impl(const uint8_t *instr, size_t ninstr, const char *exp, size_t explen,
const char *fun, int lno)
{
const char *act;
size_t actlen;
static struct db_disasm_context c;
memset(&c, 0, sizeof(c));
ctx = &c;
ctx->raw.buf = instr;
ctx->raw.len = ninstr;
ctx->act.len = 0;
ctx->act.siz = sizeof(ctx->act.buf);
db_disasm(0, 0);
act = ctx->act.buf;
actlen = ctx->act.len;
/* Remove trailing whitespace from instructions w/o operands. */
while (actlen > 0 && act[actlen - 1] == ' ')
actlen--;
if (explen != actlen || strncmp(exp, act, actlen) != 0) {
fprintf(stderr, "%s:%d:\n", fun, lno);
fprintf(stderr, "exp: \"%.*s\"\n", (int)explen, exp);
fprintf(stderr, "act: \"%.*s\"\n", (int)actlen, act);
return 1;
}
if (ctx->raw.len > 0) {
fprintf(stderr, "%s:%d: %zu byte(s) not consumed\n", fun, lno,
ctx->raw.len);
return 1;
}
return 0;
}
int
main(void)
{
int error = 0;
error |= test("\x90", "nop");
error |= test("\x00", "addb %al,0(%rax)");
error |= test("\xf2\x48\xa5", "repne movsq (%rsi),%es:(%rdi)");
error |= test("\xf3\x48\xa5", "repe movsq (%rsi),%es:(%rdi)");
error |= test("\xf3\x0f\x1e\xfa", "endbr64");
return error;
}
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