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hax65816.c
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hax65816.c
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////////////////////////////////////////////////////////////////////////////////
//
#define TITLE "hax65816 - Simple 65816 disassembler"
#define COPYR "Copyright (C) 1998,2010 Neill Corlett"
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////////////
#include "common.h"
#include "banner.h"
////////////////////////////////////////////////////////////////////////////////
static char aluop[8][4] =
{"ora", "and", "eor", "adc", "sta", "lda", "cmp", "sbc" };
static char rmwop[8][4] =
{"asl", "rol", "lsr", "ror", "???", "???", "dec", "inc" };
static int8_t mflag_default = 1;
static int8_t xflag_default = 0;
static int8_t flag_return = 1;
static int8_t flag_guess = 1;
static int8_t flag_follow = 1;
static uint32_t dasm_address, ins_address;
static int8_t mflag, xflag;
static int getbyte(void);
////////////////////////////////////////////////////////////////////////////////
static int fetchlist[10];
static int unfetchstack[10];
static int fetchn, unfetchn;
static int fetchbyte(void) {
int b;
dasm_address++;
if(unfetchn) b = unfetchstack[--unfetchn]; else b = getbyte();
fetchlist[fetchn++] = b;
return b;
}
static void unfetchbyte(int b) {
dasm_address--;
fetchn--;
if(fetchn < 0) fetchn = 0;
unfetchstack[unfetchn++] = b;
}
enum { INS_COLUMN = 23 };
static void ins(const char* fmt, ...) {
static char outputstr[100];
int outputn = INS_COLUMN;
va_list ap;
va_start(ap, fmt);
for(;;) {
char c = *fmt++;
if(!c) break;
if(c == '%') {
c = *fmt++;
switch(c) {
case '%': {
outputstr[outputn++] = '%';
break; }
case 'A': {
int n = (va_arg(ap, int) >> 5) & 7;
outputstr[outputn++] = aluop[n][0];
outputstr[outputn++] = aluop[n][1];
outputstr[outputn++] = aluop[n][2];
break; }
case 'M': {
int n = (va_arg(ap, int) >> 5) & 7;
outputstr[outputn++] = rmwop[n][0];
outputstr[outputn++] = rmwop[n][1];
outputstr[outputn++] = rmwop[n][2];
break; }
case 'B': {
int n = fetchbyte();
outputstr[outputn++] = '$';
if(n < 0) {
outputstr[outputn++] = '-';
outputstr[outputn++] = '-';
} else {
sprintf(
outputstr + outputn,
"%02lX", (unsigned long)n
);
outputn += 2;
}
break; }
case 'R': {
int n = fetchbyte();
outputstr[outputn++] = '$';
if(n < 0) {
outputstr[outputn++] = '-';
outputstr[outputn++] = '-';
outputstr[outputn++] = '-';
outputstr[outputn++] = '-';
} else {
n = ((int8_t)(n)) +
dasm_address;
sprintf(
outputstr + outputn,
"%04lX", (unsigned long)(n & 0xFFFF)
);
outputn += 4;
}
break; }
case 'Z': {
int n1 = fetchbyte();
int n2 = fetchbyte();
outputstr[outputn++] = '$';
if((n1 < 0) || (n2 < 0)) {
for(n1 = 0; n1 < 6; n1++) {
outputstr[outputn++] = '-';
}
} else {
int n = (n2 << 8) | (n1 & 0xFF);
n = ((int16_t)(n)) +
dasm_address;
sprintf(
outputstr + outputn,
"%04lX", (unsigned long)(n & 0xFFFF)
);
outputn += 6;
}
break; }
case 'G': {
int n = va_arg(ap, int);
outputstr[outputn++] = '$';
if(n < 0) {
outputstr[outputn++] = '-';
outputstr[outputn++] = '-';
} else {
sprintf(
outputstr + outputn,
"%02lX", (unsigned long)(n)
);
outputn += 2;
}
break; }
case 'W': {
int q, n[2];
n[1] = fetchbyte();
n[0] = fetchbyte();
outputstr[outputn++] = '$';
for(q = 0; q < 2; q++) {
if(n[q] < 0) {
outputstr[outputn++] = '-';
outputstr[outputn++] = '-';
} else {
sprintf(
outputstr + outputn,
"%02lX", (unsigned long)(n[q])
);
outputn += 2;
}
}
break; }
case 'L': {
int q, n[3];
n[2] = fetchbyte();
n[1] = fetchbyte();
n[0] = fetchbyte();
outputstr[outputn++] = '$';
for(q = 0; q < 3; q++) {
if(n[q] < 0) {
outputstr[outputn++] = '-';
outputstr[outputn++] = '-';
} else {
sprintf(
outputstr + outputn,
"%02lX", (unsigned long)(n[q])
);
outputn += 2;
}
}
break; }
case 'I': case 'X': {
int q, n[3];
int8_t* sflag = (c == 'I') ? (&mflag) : (&xflag);
outputstr[outputn++] = '$';
if(*sflag) {
n[0] = fetchbyte();
n[1] = fetchbyte();
//
// BRK/COP/WDM/STP after this?
//
switch(n[1]) {
case 0x00: case 0x02:
case 0x42: case 0xDB:
if(flag_follow && flag_guess
) {
(*sflag) = 0;
q = 2;
break;
}
default:
unfetchbyte(n[1]);
q = 1;
break;
}
} else {
n[0] = fetchbyte();
n[1] = fetchbyte();
n[2] = fetchbyte();
//
// BRK/COP/WDM/STP after this?
//
switch(n[2]) {
case 0x00: case 0x02:
case 0x42: case 0xDB:
if(flag_follow && flag_guess
) {
(*sflag) = 1;
unfetchbyte(n[2]);
unfetchbyte(n[1]);
q = 1;
break;
}
default:
unfetchbyte(n[2]);
q = 2;
break;
}
}
while(q--) {
if(n[q] < 0) {
outputstr[outputn++] = '-';
outputstr[outputn++] = '-';
} else {
sprintf(
outputstr + outputn,
"%02lX", (unsigned long)(n[q])
);
outputn += 2;
}
}
break; }
}
} else {
outputstr[outputn++] = c;
}
}
outputstr[outputn] = 0;
sprintf(outputstr, "%02lX/%04lX:",
(unsigned long)(ins_address >> 16),
(unsigned long)(ins_address & 0xFFFF)
);
memset(outputstr + 8, ' ', INS_COLUMN - 8);
outputn = 9;
{ int i;
for(i = 0; i < fetchn; i++) {
int n = fetchlist[i];
if(n < 0) {
outputstr[outputn ] = '-';
outputstr[outputn+1] = '-';
} else {
sprintf(outputstr + outputn, "%02X", n);
outputstr[outputn+2] = ' ';
}
outputn += 3;
}
}
fetchn = 0;
printf("%s\n", outputstr);
va_end(ap);
}
static void disassemble_one(void) {
int opcode;
ins_address = dasm_address;
opcode = fetchbyte();
if(opcode < 0) return;
if (opcode == 0x00) { ins("brk %B");
} else if(opcode == 0x20) { ins("jsr %W");
} else if(opcode == 0x40) { ins("rti"); if(flag_return) { mflag = mflag_default; xflag = xflag_default; }
} else if(opcode == 0x60) { ins("rts"); if(flag_return) { mflag = mflag_default; xflag = xflag_default; }
} else if(opcode == 0x80) { ins("bra %R");
} else if(opcode == 0xA0) { ins("ldy #%X");
} else if(opcode == 0xC0) { ins("cpy #%X");
} else if(opcode == 0xE0) { ins("cpx #%X");
} else if(opcode == 0x10) { ins("bpl %R");
} else if(opcode == 0x30) { ins("bmi %R");
} else if(opcode == 0x50) { ins("bvc %R");
} else if(opcode == 0x70) { ins("bvs %R");
} else if(opcode == 0x90) { ins("bcc %R");
} else if(opcode == 0xB0) { ins("bcs %R");
} else if(opcode == 0xD0) { ins("bne %R");
} else if(opcode == 0xF0) { ins("beq %R");
} else if((opcode & 0x1F) == 0x01) { ins("%A (%B,x)" , opcode);
} else if((opcode & 0x1F) == 0x11) { ins("%A (%B),y" , opcode);
} else if(opcode == 0x02) { ins("cop %B");
} else if(opcode == 0x22) { ins("jsr %L");
} else if(opcode == 0x42) { ins("wdm %B");
} else if(opcode == 0x62) { ins("per %Z");
} else if(opcode == 0x82) { ins("brl %Z");
} else if(opcode == 0xA2) { ins("ldx #%X");
} else if(opcode == 0xC2) {
int n = fetchbyte();
if(flag_follow) if(n >= 0) {
if(n & 0x10) xflag = 0;
if(n & 0x20) mflag = 0;
}
ins("rep #%G", n);
} else if(opcode == 0xE2) {
int n = fetchbyte();
if(flag_follow) if(n >= 0) {
if(n & 0x10) xflag = 1;
if(n & 0x20) mflag = 1;
}
ins("sep #%G", n);
} else if((opcode & 0x1F) == 0x12) { ins("%A (%B)" , opcode);
} else if((opcode & 0x1F) == 0x03) { ins("%A %B,s" , opcode);
} else if((opcode & 0x1F) == 0x13) { ins("%A (%B,s),y", opcode);
} else if(opcode == 0x04) { ins("tsb %B");
} else if(opcode == 0x24) { ins("bit %B");
} else if(opcode == 0x44) { ins("mvp %B,%B");
} else if(opcode == 0x64) { ins("stz %B");
} else if(opcode == 0x84) { ins("sty %B");
} else if(opcode == 0xA4) { ins("ldy %B");
} else if(opcode == 0xC4) { ins("cpy %B");
} else if(opcode == 0xE4) { ins("cpx %B");
} else if(opcode == 0x14) { ins("trb %B");
} else if(opcode == 0x34) { ins("bit %B,x");
} else if(opcode == 0x54) { ins("mvn %B,%B");
} else if(opcode == 0x74) { ins("stz %B,x");
} else if(opcode == 0x94) { ins("sty %B,x");
} else if(opcode == 0xB4) { ins("ldy %B,x");
} else if(opcode == 0xD4) { ins("pei (%B)");
} else if(opcode == 0xF4) { ins("pea %W");
} else if((opcode & 0x1F) == 0x05) { ins("%A %B" , opcode);
} else if((opcode & 0x1F) == 0x15) { ins("%A %B,x" , opcode);
} else if(((opcode & 0x1F) == 0x06) && ((opcode & 0xC0) != 0x80)) {
ins("%M %B", opcode);
} else if(opcode == 0x86) { ins("stx %B");
} else if(opcode == 0xA6) { ins("ldx %B");
} else if(((opcode & 0x1F) == 0x16) && ((opcode & 0xC0) != 0x80)) {
ins("%M %B,x", opcode);
} else if(opcode == 0x96) { ins("stx %B,y");
} else if(opcode == 0xB6) { ins("ldx %B,y");
} else if((opcode & 0x1F) == 0x07) { ins("%A [%B]" , opcode);
} else if((opcode & 0x1F) == 0x17) { ins("%A [%B],y" , opcode);
} else if(opcode == 0x08) { ins("php");
} else if(opcode == 0x28) { ins("plp");
} else if(opcode == 0x48) { ins("pha");
} else if(opcode == 0x68) { ins("pla");
} else if(opcode == 0x88) { ins("dey");
} else if(opcode == 0xA8) { ins("tay");
} else if(opcode == 0xC8) { ins("iny");
} else if(opcode == 0xE8) { ins("inx");
} else if(opcode == 0x18) { ins("clc");
} else if(opcode == 0x38) { ins("sec");
} else if(opcode == 0x58) { ins("cli");
} else if(opcode == 0x78) { ins("sei");
} else if(opcode == 0x98) { ins("tya");
} else if(opcode == 0xB8) { ins("clv");
} else if(opcode == 0xD8) { ins("cld");
} else if(opcode == 0xF8) { ins("sed");
} else if((opcode & 0x1F) == 0x09) {
if(opcode == 0x89) ins("bit #%I");
else ins("%A #%I", opcode);
} else if((opcode & 0x1F) == 0x19) { ins("%A %W,y" , opcode);
} else if(opcode == 0x0A) { ins("asl");
} else if(opcode == 0x2A) { ins("rol");
} else if(opcode == 0x4A) { ins("lsr");
} else if(opcode == 0x6A) { ins("ror");
} else if(opcode == 0x8A) { ins("txa");
} else if(opcode == 0xAA) { ins("tax");
} else if(opcode == 0xCA) { ins("dex");
} else if(opcode == 0xEA) { ins("nop");
} else if(opcode == 0x1A) { ins("inc");
} else if(opcode == 0x3A) { ins("dec");
} else if(opcode == 0x5A) { ins("phy");
} else if(opcode == 0x7A) { ins("ply");
} else if(opcode == 0x9A) { ins("txs");
} else if(opcode == 0xBA) { ins("tsx");
} else if(opcode == 0xDA) { ins("phx");
} else if(opcode == 0xFA) { ins("plx");
} else if(opcode == 0x0B) { ins("phd");
} else if(opcode == 0x2B) { ins("pld");
} else if(opcode == 0x4B) { ins("phk");
} else if(opcode == 0x6B) { ins("rtl"); if(flag_return) { mflag = mflag_default; xflag = xflag_default; }
} else if(opcode == 0x8B) { ins("phb");
} else if(opcode == 0xAB) { ins("plb");
} else if(opcode == 0xCB) { ins("wai");
} else if(opcode == 0xEB) { ins("xba");
} else if(opcode == 0x1B) { ins("tcs");
} else if(opcode == 0x3B) { ins("tsc");
} else if(opcode == 0x5B) { ins("tcd");
} else if(opcode == 0x7B) { ins("tdc");
} else if(opcode == 0x9B) { ins("txy");
} else if(opcode == 0xBB) { ins("tyx");
} else if(opcode == 0xDB) { ins("stp");
} else if(opcode == 0xFB) { ins("xce");
} else if(opcode == 0x0C) { ins("tsb %W");
} else if(opcode == 0x2C) { ins("bit %W");
} else if(opcode == 0x4C) { ins("jmp %W");
} else if(opcode == 0x6C) { ins("jmp (%W)");
} else if(opcode == 0x8C) { ins("sty %W");
} else if(opcode == 0xAC) { ins("ldy %W");
} else if(opcode == 0xCC) { ins("cpy %W");
} else if(opcode == 0xEC) { ins("cpx %W");
} else if(opcode == 0x1C) { ins("trb %W");
} else if(opcode == 0x3C) { ins("bit %W,x");
} else if(opcode == 0x5C) { ins("jmp %L");
} else if(opcode == 0x7C) { ins("jmp (%W,x)");
} else if(opcode == 0x9C) { ins("stz %W");
} else if(opcode == 0xBC) { ins("ldy %W,x");
} else if(opcode == 0xDC) { ins("jmp [%W]");
} else if(opcode == 0xFC) { ins("jsr (%W,x)");
} else if((opcode & 0x1F) == 0x0D) { ins("%A %W" , opcode);
} else if((opcode & 0x1F) == 0x1D) { ins("%A %W,x" , opcode);
} else if(((opcode & 0x1F) == 0x0E) && ((opcode & 0xC0) != 0x80)) {
ins("%M %W", opcode);
} else if(opcode == 0x8E) { ins("stx %W");
} else if(opcode == 0xAE) { ins("ldx %W");
} else if(((opcode & 0x1F) == 0x1E) && ((opcode & 0xC0) != 0x80)) {
ins("%M %W,x", opcode);
} else if(opcode == 0x9E) { ins("stz %W,x");
} else if(opcode == 0xBE) { ins("ldx %W,y");
} else if((opcode & 0x1F) == 0x0F) { ins("%A %L" , opcode);
} else if((opcode & 0x1F) == 0x1F) { ins("%A %L,x" , opcode);
} else { ins("???"); }
}
////////////////////////////////////////////////////////////////////////////////
static FILE* infile = NULL;
static uint32_t infile_bytes_left;
static int getbyte(void) {
if(infile_bytes_left) {
int n = fgetc(infile);
if(n == EOF) {
infile_bytes_left = 0;
return -1;
} else {
infile_bytes_left--;
return (n & 0xFF);
}
}
return -1;
}
static void disasm_range(uint32_t fileoffset, uint32_t len, uint32_t addr) {
fseeko(infile, fileoffset, SEEK_SET);
dasm_address = addr;
infile_bytes_left = len;
mflag = mflag_default;
xflag = xflag_default;
fetchn = unfetchn = 0;
while(infile_bytes_left > 0) {
disassemble_one();
}
}
static uint32_t gethex(const char* s) {
if(!s[0]) return 0;
if(s[0] == '$') s++;
if(s[0] == '0' && (s[1] == 'x' || s[1] == 'X')) s += 2;
return (uint32_t)strtoul(s, NULL, 16);
}
////////////////////////////////////////////////////////////////////////////////
int main(int argc, char** argv) {
const char* infilename;
uint32_t arg_start;
uint32_t arg_len;
uint32_t arg_addr;
int option_argn = 4;
normalize_argv0(argv[0]);
if(argc < 4) {
banner();
printf(
"Usage: %s imagefile start address [length] [options]\n"
"Output is written to stdout. All values must be given in hex.\n"
"If no length is given, disassembly will stop at the end of the bank.\n"
"Options:\n"
" -m0 Assume M flag = 0\n"
" -m1 Assume M flag = 1 (default)\n"
" -x0 Assume X flag = 0 (default)\n"
" -x1 Assume X flag = 1\n"
" -noreturn Disable flag reset after RTS/RTL/RTI\n"
" -noguess Disable flag guess on BRK/COP/WDM/STP\n"
" -nofollow Disable REP/SEP following (not recommended)\n",
argv[0]
);
return 1;
}
infilename = argv[1];
arg_start = gethex(argv[2]);
arg_addr = gethex(argv[3]);
arg_len = ((arg_addr & 0xFFFF) ^ 0xFFFF) + 1;
if((argc >= 5) && (argv[4][0] != '-')) {
arg_len = gethex(argv[4]);
option_argn = 5;
}
while(option_argn < argc) {
const char* s = argv[option_argn];
if (!strcmp(s, "-m0")) { mflag_default = 0;
} else if(!strcmp(s, "-m1")) { mflag_default = 1;
} else if(!strcmp(s, "-x0")) { xflag_default = 0;
} else if(!strcmp(s, "-x1")) { xflag_default = 1;
} else if(!strcmp(s, "-noreturn")) { flag_return = 0;
} else if(!strcmp(s, "-noguess" )) { flag_guess = 0;
} else if(!strcmp(s, "-nofollow")) { flag_follow = 0;
} else {
printf("unknown option: %s\n", s);
return 1;
}
option_argn++;
}
printf(
"Disassembly of %s\n"
"Starting at offset $%lX for $%lX bytes\n"
"65816 address starts at $%lX\n"
"return=%s guess=%s follow=%s\n"
"\n",
infilename,
(unsigned long)arg_start,
(unsigned long)arg_len,
(unsigned long)arg_addr,
flag_return ? "on" : "off",
flag_guess ? "on" : "off",
flag_follow ? "on" : "off"
);
infile = fopen(infilename, "rb");
if(!infile) {
fprintf(stderr, "Error: %s: %s\n", infilename, strerror(errno));
return 1;
}
disasm_range(arg_start, arg_len, arg_addr);
fclose(infile);
return 0;
}
////////////////////////////////////////////////////////////////////////////////