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Disassemble a series of 4 or more 0xff as fill block

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This commit is contained in:
Stefan Rueger
2024-07-24 19:54:02 +01:00
parent ac0f0af7bb
commit fec6e842df
1 changed files with 17 additions and 2 deletions
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19
src/disasm.c
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@@ -435,6 +435,11 @@ static int process_num(const char *buf, int buflen, int nbytes, int pos, int off
return nbytes;
}
static int process_fill0xff(const char *buf, int buflen, int nbytes, int pos, int offset) {
lineout(str_ccprintf(".fill %d, 2, 0xffff", nbytes/2), NULL, -1, 1, buf, pos, offset, 0);
return nbytes/2*2;
}
// Output quoted string
static int process_string(const char *buf, int buflen, int pos, int offset) {
char *code, *out;
@@ -466,9 +471,19 @@ static int process_string(const char *buf, int buflen, int pos, int offset) {
static int process_data(const char *buf, int buflen, int pos, int offset) {
int ret = 0, index = find_symbol('P', disasm_wrap(pos + offset));
if(index < 0) {
// Try to see if there are PGM data at the next (odd) address
if((index = find_symbol('P', disasm_wrap(pos + offset + 1))) < 0)
if(pos+1 >= buflen)
return 0;
if((index = find_symbol('P', disasm_wrap(pos + offset + 1))) < 0) { // No PGM label, check for fill block
int k = 0;
if((buf[pos] &0xff) == 0xff && (buf[pos+1] & 0xff) == 0xff)
for(k=pos+2; k<buflen; k++)
if((buf[k] & 0xff) != 0xff || find_symbol('P', disasm_wrap(k + offset)) >= 0)
break;
k &= ~1;
return !k || k-pos < 4? 0: process_fill0xff(buf, buflen, k-pos, pos, offset);
}
// Found PGM label at odd address, print byte and continue
process_num(buf, buflen, 1, pos, offset);
ret = 1;
}