6502/x65
1
0
Fork 0
mirror of https://github.com/ksherlock/x65.git synced 2024-06-25 20:29:31 +00:00
Code Issues Projects Releases Wiki Activity

Fixes to disassembling code pointer arrays

Browse Source 
- Removing some filters that pulled out relevant references from pointer
arrays
- Separating 6502 illegal opcodes (6502ill) and WDC specific 65C02
instructions (65C02WDC) from general disassembly
- invalid instructions will always be disassembled as dc.b $hh instead
of the non-assemblable instruction
This commit is contained in:
Carl-Henrik Skårstedt 2015-12-11 23:01:52 -08:00
parent c96399d896
commit 0f740c25bd
1 changed files with 35 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
disassembler/x65dsasm.cpp
View File

@ -289,7 +289,10 @@ enum MNM_Base {
mnm_xce,
mnm_inv,
mnm_pla,
mnm_bbs0,
mnm_wdc_and_illegal_instructions,
mnm_bbs0 = mnm_wdc_and_illegal_instructions,
mnm_bbs1,
mnm_bbs2,
mnm_bbs3,
@ -305,6 +308,7 @@ enum MNM_Base {
mnm_bbr5,
mnm_bbr6,
mnm_bbr7,
mnm_ahx,
mnm_anc,
mnm_aac,
@ -1306,7 +1310,7 @@ int GetLabelIndex(int addr) {
}
void GetReferences(unsigned char *mem, size_t bytes, bool acc_16, bool ind_16, int addr, const dismnm *opcodes, int init_data, strref labels)
void GetReferences(unsigned char *mem, size_t bytes, bool acc_16, bool ind_16, int addr, bool ill_wdc, const dismnm *opcodes, int init_data, strref labels)
{
int start_addr = addr;
int end_addr = addr + (int)bytes;
@ -1446,8 +1450,10 @@ void GetReferences(unsigned char *mem, size_t bytes, bool acc_16, bool ind_16, i
}
}
arg_size = opcodes[op].arg_size;;
mode = opcodes[op].addrMode;
bool not_valid = opcodes[op].mnemonic==mnm_inv || (!ill_wdc && opcodes[op].mnemonic>=mnm_wdc_and_illegal_instructions);
arg_size = not_valid ? 0 : opcodes[op].arg_size;;
mode = not_valid ? AM_NON : opcodes[op].addrMode;
switch (mode) {
case AM_IMM_DBL_A:
arg_size = acc_16 ? 2 : 1;
@ -1546,8 +1552,10 @@ void GetReferences(unsigned char *mem, size_t bytes, bool acc_16, bool ind_16, i
}
}
int arg_size = opcodes[op].arg_size;;
int mode = opcodes[op].addrMode;
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;
@ -1592,7 +1600,7 @@ void GetReferences(unsigned char *mem, size_t bytes, bool acc_16, bool ind_16, i
if (curr_label < (int)refs.size()) {
if (refs[curr_label].label) {
refs[curr_label].separator = 1; // user labels are always global
was_data = refs[curr_label].data==DT_DATA;
was_data = refs[curr_label].data!=DT_CODE;
} else {
bool prev_data = was_data;
was_data = separator && !(!was_data && op==0x4c && prev_op==0x4c);
@ -1638,7 +1646,7 @@ void GetReferences(unsigned char *mem, size_t bytes, bool acc_16, bool ind_16, i
refs[curr_label].separator = separator;
refs[curr_label].data = was_data ? DT_DATA : DT_CODE;
}
if (was_data) {
if (was_data && refs[curr_label].data != DT_PTRS && refs[curr_label].data != DT_PTRS_DATA) {
int start = curr;
int end = (curr_label+1)<(int)refs.size() ? refs[curr_label+1].address : (int)(addr + bytes);
for (int k = 0; k<(int)refs.size(); ++k) {
@ -1652,7 +1660,7 @@ void GetReferences(unsigned char *mem, size_t bytes, bool acc_16, bool ind_16, i
}
}
}
if (refs[curr_label].pRefs->size()==0) {
if (refs[curr_label].pRefs->size()==0 && !refs[curr_label].label) {
int lbl = curr_label;
while (lbl && refs[lbl].pRefs->size()==0)
lbl--;
@ -1874,7 +1882,7 @@ bool IsReadOnlyInstruction(MNM_Base op_base)
}
static const char spacing[] = " ";
void Disassemble(strref filename, unsigned char *mem, size_t bytes, bool acc_16, bool ind_16, int addr, const dismnm *opcodes, bool src, int init_data, strref labels)
void Disassemble(strref filename, unsigned char *mem, size_t bytes, bool acc_16, bool ind_16, int addr, bool ill_wdc, const dismnm *opcodes, bool src, int init_data, strref labels)
{
FILE *f = stdout;
bool opened = false;
@ -1892,7 +1900,7 @@ void Disassemble(strref filename, unsigned char *mem, size_t bytes, bool acc_16,
int end_addr = addr + (int)bytes;
refs.clear();
GetReferences(mem, bytes, acc_16, ind_16, addr, opcodes, init_data, labels);
GetReferences(mem, bytes, acc_16, ind_16, addr, ill_wdc, opcodes, init_data, labels);
int curr_label_index = 0;
bool separator = false;
@ -2040,8 +2048,10 @@ void Disassemble(strref filename, unsigned char *mem, size_t bytes, bool acc_16,
}
}
int arg_size = opcodes[op].arg_size;;
int mode = opcodes[op].addrMode;
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;
@ -2122,6 +2132,9 @@ void Disassemble(strref filename, unsigned char *mem, size_t bytes, bool acc_16,
}
}
if (not_valid)
out.sprintf_append("dc.b $%02x ; $%04x ", op, curr_addr);
const char *fmt = (src && lblname) ? aAddrModeFmtSrc[mode] : aAddrModeFmt[mode];
const char *mnemonic = zsMNM[opcodes[op].mnemonic];
switch (mode) {
@ -2263,6 +2276,7 @@ int main(int argc, char **argv)
bool ind_16 = true;
bool src = false;
bool prg = false;
bool ill_wdc = false;
const dismnm *opcodes = a6502_ops;
strref labels;
@ -2314,6 +2328,13 @@ int main(int argc, char **argv)
opcodes = a65C02_ops;
else if (arg.same_str("6502"))
opcodes = a6502_ops;
else if (arg.same_str("65C02WDC")) {
opcodes = a65C02_ops;
ill_wdc = true;
} else if (arg.same_str("6502ILL")) {
opcodes = a6502_ops;
ill_wdc = true;
}
}
}
}
@ -2339,7 +2360,7 @@ int main(int argc, char **argv)
size_t bytes = size - skip;
if (end && bytes > size_t(end - skip))
bytes = size_t(end - skip);
Disassemble(out, mem + skip, bytes, acc_16, ind_16, addr, opcodes, src, data, labels);
Disassemble(out, mem + skip, bytes, acc_16, ind_16, addr, ill_wdc, opcodes, src, data, labels);
}
free(mem);
}