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Disassembler swapping the order of a couple of things

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- Re-evaluating code separators (jmp, rts, etc) before determining local
labels
- Re-evaluated label separator was off by one.
This commit is contained in:
Carl-Henrik Skårstedt 2015-12-18 22:41:16 -08:00
parent 794171d48b
commit e3241c66aa
1 changed files with 74 additions and 68 deletions

142
disassembler/x65dsasm.cpp

@ -1754,6 +1754,80 @@ void GetReferences(unsigned char *mem, size_t bytes, bool acc_16, bool ind_16, i
++k;
}
bytes = bytes_orig;
addr = addr_orig;
mem = mem_orig;
curr_label = 0;
was_data = true;
// disassemble code sections again with all the labels filtered out to
// re-evaluate separators
bool was_separator = true;
while (bytes && curr_label<(int)refs.size()) {
while (curr_label<(int)refs.size() && addr>=refs[curr_label].address) {
if (!was_data && !was_separator && refs[curr_label].separator)
refs[curr_label].separator = 0;
was_data = refs[curr_label].data != DT_CODE;
was_separator = !!refs[curr_label].separator || was_data;
curr_label++;
}
if (curr_label==refs.size())
break;
if (was_data || was_separator) {
int skip = refs[curr_label].address-addr;
if (skip>(int)bytes)
break;
bytes -= skip;
addr += skip;
mem += skip;
} else {
unsigned char op = *mem++;
int curr = addr;
bytes--;
addr++;
if (opcodes == a65816_ops) {
if (op == 0xe2) { // sep
if ((*mem)&0x20) acc_16 = false;
if ((*mem)&0x10) ind_16 = false;
} else if (op == 0xc2) { // rep
if ((*mem)&0x20) acc_16 = true;
if ((*mem)&0x10) ind_16 = true;
}
}
bool not_valid = opcodes[op].mnemonic==mnm_inv || (!ill_wdc && opcodes[op].mnemonic>=mnm_wdc_and_illegal_instructions);
int arg_size = not_valid ? 0 : opcodes[op].arg_size;;
int mode = not_valid ? AM_NON : opcodes[op].addrMode;
switch (mode) {
case AM_IMM_DBL_A:
arg_size = acc_16 ? 2 : 1;
break;
case AM_IMM_DBL_I:
arg_size = ind_16 ? 2 : 1;
break;
}
addr += arg_size;
mem += arg_size;
if (arg_size > (int)bytes)
break;
bytes -= arg_size;
if (op == 0x00 || op == 0x60 || op == 0x40 || op == 0x6b ||
((op == 0x4c || op == 0x6c) && (prev_op!=0x4c && prev_op!=0x6c)) ||
op == 0x6c || op == 0x7c || op == 0x5c || op == 0xdc) { // rts, rti, rtl or jmp
refs[curr_label].separator = true;
was_separator = true;
int skip = refs[curr_label+1].address-addr;
if (skip>(int)bytes)
break;
bytes -= skip;
addr += skip;
mem += skip;
}
}
}
// figure out which labels can be local
k = refs.begin(); // make all labels that are not assigned something local
@ -1827,74 +1901,6 @@ void GetReferences(unsigned char *mem, size_t bytes, bool acc_16, bool ind_16, i
++k;
}
bytes = bytes_orig;
addr = addr_orig;
mem = mem_orig;
curr_label = 0;
was_data = true;
// disassemble code sections again with all the labels filtered out to
// re-evaluate separators
while (bytes && curr_label<(int)refs.size()) {
while (curr_label<(int)refs.size() && addr>=refs[curr_label].address) {
was_data = refs[curr_label].data != DT_CODE;
curr_label++;
}
if (curr_label==refs.size())
break;
if (was_data || refs[curr_label].separator) {
int skip = refs[curr_label].address-addr;
if (skip>(int)bytes)
break;
bytes -= skip;
addr += skip;
mem += skip;
} else {
unsigned char op = *mem++;
int curr = addr;
bytes--;
addr++;
if (opcodes == a65816_ops) {
if (op == 0xe2) { // sep
if ((*mem)&0x20) acc_16 = false;
if ((*mem)&0x10) ind_16 = false;
} else if (op == 0xc2) { // rep
if ((*mem)&0x20) acc_16 = true;
if ((*mem)&0x10) ind_16 = true;
}
}
bool not_valid = opcodes[op].mnemonic==mnm_inv || (!ill_wdc && opcodes[op].mnemonic>=mnm_wdc_and_illegal_instructions);
int arg_size = not_valid ? 0 : opcodes[op].arg_size;;
int mode = not_valid ? AM_NON : opcodes[op].addrMode;
switch (mode) {
case AM_IMM_DBL_A:
arg_size = acc_16 ? 2 : 1;
break;
case AM_IMM_DBL_I:
arg_size = ind_16 ? 2 : 1;
break;
}
addr += arg_size;
mem += arg_size;
if (arg_size > (int)bytes)
break;
bytes -= arg_size;
if (op == 0x00 || op == 0x60 || op == 0x40 || op == 0x6b ||
((op == 0x4c || op == 0x6c) && (prev_op!=0x4c && prev_op!=0x6c)) ||
op == 0x6c || op == 0x7c || op == 0x5c || op == 0xdc) { // rts, rti, rtl or jmp
refs[curr_label].separator = true;
int skip = refs[curr_label+1].address-addr;
if (skip>(int)bytes)
break;
bytes -= skip;
addr += skip;
mem += skip;
}
}
}
// re-check for code references to code being mislabeled