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Try to support assembling multi byte instructions.

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This commit is contained in:
Radosław Kujawa 2017-02-02 15:41:29 +01:00
parent 09a92740e9
commit 77ce27e4fc
2 changed files with 15 additions and 2 deletions
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10
src/instruction.c
View File

@ -111,6 +111,7 @@ instruction_print(instruction_t *i)
bool
assemble_single_implied(uint8_t **buf, uint8_t *bsize, const char *mnemonic)
{
/* XXX: does brk needs special handling? */
return assemble_single(buf, bsize, mnemonic, IMPLIED, 0, 0);
}
@ -140,16 +141,21 @@ assemble_single(uint8_t **buf, uint8_t *bsize, const char *mnemonic, addressing_
return false;
}
*bsize = id.size;
*buf = malloc(id.size);
if(*buf == NULL) {
fprintf(stderr, "Error allocating assembly buffer\n");
return false;
}
/* fill the buffer */
memset(*buf, 0, id.size);
*bsize = id.size;
*buf[0] = opcode;
/* XXX */
if (id.size > 1)
*buf[1] = op1;
if (id.size > 2)
*buf[2] = op2;
return found;
}

7
test/test_assemble.c
View File

@ -31,6 +31,13 @@ ATF_TC_BODY(asm_single, tc)
free(asmbuf);
caddr += bsize;
ATF_REQUIRE(assemble_single(&asmbuf, &bsize, "lda", IMMEDIATE, 0xAA, 0));
ATF_CHECK(asmbuf[0] == 0xA9); /* check if lda really */
ATF_CHECK(asmbuf[1] == 0xAA); /* check the operand */
ATF_REQUIRE(bus_load_buf(&b, caddr, asmbuf, bsize));
free(asmbuf);
caddr += bsize;
ATF_REQUIRE(assemble_single_implied(&asmbuf, &bsize, "stp"));
ATF_CHECK(asmbuf[0] == 0xDB); /* check if stp really */
ATF_REQUIRE(bus_load_buf(&b, caddr, asmbuf, bsize));