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#include <sys/stat.h>
#include <fcntl.h>
#include <getopt.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <builder.h>
#include "cerr.h"
#include "macros.h"
#define MEM_RESERVED 0x200
#define MEM_TOTAL 0xFFF
#define LABEL_BUFSIZ (sizeof("label_4095"))
static void dumpfile(int, const char *);
static const char *getlabel(uint16_t);
static uint16_t labelsfxs[MEM_TOTAL - MEM_RESERVED + 1];
int
main(int argc, char **argv)
{
int opt;
const struct option longopts[] = {
{"help", no_argument, nullptr, 'h'},
{nullptr, no_argument, nullptr, 0 },
};
cerrinit(*argv);
while ((opt = getopt_long(argc, argv, "h", longopts, nullptr)) != -1) {
switch (opt) {
case 'h':
execlp("man", "man", "1", argv[0], nullptr);
die("execlp: man 1 %s", argv[0]);
default:
fprintf(stderr,
"Usage: %s [file ...]\n"
" %s -h\n",
argv[0], argv[0]);
exit(EXIT_FAILURE);
}
}
argc -= optind;
argv += optind;
if (!argc)
dumpfile(STDIN_FILENO, "-");
for (int i = 0; i < argc; i++) {
if (streq("-", argv[i]))
dumpfile(STDIN_FILENO, "-");
else {
int fd;
if ((fd = open(argv[i], O_RDONLY)) == -1)
die("open: %s", argv[i]);
dumpfile(fd, argv[i]);
close(fd);
}
}
return EXIT_SUCCESS;
}
void
dumpfile(int fd, const char *filename)
{
char *buf;
size_t blksize;
ssize_t nr;
struct stat st;
struct u8str sb;
if (fstat(fd, &st) == -1)
die("fstat: %s", filename);
blksize = MAX(st.st_blksize, BUFSIZ);
if (!(buf = malloc(blksize)))
die("malloc");
/* Load the contents of the file into sb */
u8strinit(&sb, S_ISREG(st.st_mode) ? (size_t)st.st_size : blksize);
while ((nr = read(fd, buf, blksize)) > 0) {
struct u8view v = {
.p = buf,
.len = nr,
};
if (!u8strpush(&sb, v))
die("u8strpush");
}
if (nr == -1)
die("read: %s", filename);
free(buf);
if (sb.len & 1) {
diex("%s: binary size (%zu B) is odd; missing padding bytes?", filename,
sb.len);
}
for (size_t i = 0, j = 0; i < sb.len; i += 2) {
uint16_t op = (sb.p[i] << 8) | sb.p[i + 1];
switch (op >> 12) {
case 0x0:
case 0x1:
case 0x2:
case 0xA:
case 0xB:;
uint16_t addr = op & 0xFFF;
if (op != 0x00E0 && op != 0x00EE && addr >= MEM_RESERVED
&& !labelsfxs[addr - MEM_RESERVED])
{
labelsfxs[addr - MEM_RESERVED] = ++j;
}
}
}
for (size_t i = 0; i < sb.len; i += 2) {
uint16_t op = (sb.p[i] << 8) | sb.p[i + 1];
static bool indent;
if (i < lengthof(labelsfxs) && labelsfxs[i]) {
printf("%s:\n", getlabel(i + MEM_RESERVED));
indent = true;
}
if (indent)
putchar('\t');
switch (op >> 12) {
case 0x0:
case 0x1:
case 0x2:
case 0xA:
case 0xB:;
static const char *ops_1[] = {
[0x0] = "sys", [0x1] = "jp", [0x2] = "call",
[0xA] = "ld i", [0xB] = "jp v0",
};
if (op == 0x00E0)
puts("cls");
else if (op == 0x00EE)
puts("ret");
else
printf("%s %s\n", ops_1[op >> 12], getlabel(op & 0xFFF));
break;
case 0x3:
case 0x4:
case 0x6:
case 0x7:
case 0xC:;
static const char *ops_2[] = {
[0x3] = "se", [0x4] = "sne", [0x6] = "ld",
[0x7] = "add", [0xC] = "rnd",
};
printf("%s v%x 0x%02X\n", ops_2[op >> 12], (op >> 8) & 0xF,
op & 0xFF);
break;
case 0x5:
case 0x8:
case 0x9:
case 0xD:;
uint8_t n1, n2, n3, n4, i;
static const char *ops_3[0xFF + 1] = {
[0x50] = "se", [0x80] = "ld", [0x81] = "or", [0x82] = "and",
[0x83] = "xor", [0x84] = "add", [0x85] = "sub", [0x86] = "shr",
[0x87] = "subn", [0x8E] = "shl", [0x90] = "sne",
};
n1 = op >> 12;
n2 = (op >> 8) & 0xF;
n3 = (op >> 4) & 0xF;
n4 = (op >> 0) & 0xF;
i = (n1 << 4) | n4;
if (n1 == 0xD)
printf("drw v%x v%x %u\n", n2, n3, n4);
else if (!ops_3[i])
goto print_bytes;
else {
printf(n4 == 0x6 || n4 == 0xE ? "%s v%x\n" : "%s v%x v%x\n",
ops_3[i], n2, n3);
}
break;
case 0xE:
if (op & 0xFF != 0x9E)
goto print_bytes;
printf("skp v%x\n", (op >> 12) & 0xF);
break;
case 0xF:;
uint8_t x = (op >> 8) & 0xF;
switch (op & 0xFF) {
case 0x07:
printf("ld v%x dt\n", x);
break;
case 0x0A:
printf("ld v%x k\n", x);
break;
case 0x15:
printf("ld dt v%x\n", x);
break;
case 0x18:
printf("ld st v%x\n", x);
break;
case 0x1E:
printf("add i v%x\n", x);
break;
case 0x29:
printf("hex v%x\n", x);
break;
case 0x33:
printf("bcd v%x\n", x);
break;
case 0x55:
printf("stor v%x\n", x);
break;
case 0x65:
printf("rstr v%x\n", x);
break;
default:
goto print_bytes;
}
break;
default:
print_bytes:
printf("db 0x%02X\n%sdb 0x%02X\n", op >> 8, indent ? "\t" : "",
op & 0xFF);
}
}
u8strfree(sb);
}
const char *
getlabel(uint16_t addr)
{
static char buf[LABEL_BUFSIZ + 69];
if (addr < MEM_RESERVED)
snprintf(buf, sizeof(buf), "0x%03X", addr);
else {
snprintf(buf, sizeof(buf), "label_%" PRIu16,
labelsfxs[addr - MEM_RESERVED]);
}
return buf;
}
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