mirror of
https://github.com/ksherlock/x65.git
synced 2024-06-02 03:41:28 +00:00
Iterating on the disassembler
- exploring rules to better distinguish between code and data
This commit is contained in:
Carl-Henrik Skårstedt
parent
bf2e281751
commit
d73b7c8581
|
|
@ -944,7 +944,6 @@ enum RefType {
|
|||
RT_JUMP, // jmp
|
||||
RT_JSR, // jsr
|
||||
RT_DATA, // lda $...
|
||||
|
||||
RT_COUNT
|
||||
};
|
||||
|
||||
|
|
@ -1063,6 +1062,10 @@ void GetReferences(unsigned char *mem, size_t bytes, bool acc_16, bool ind_16, i
|
|||
addr = addr_orig;
|
||||
int curr_label = 0;
|
||||
int prev_addr = -1;
|
||||
bool was_data = false;
|
||||
refs[curr_label].data = 0;
|
||||
bool separator = false;
|
||||
int prev_op = 0xff;
|
||||
while (bytes && curr_label<refs.size()) {
|
||||
unsigned char op = *mem++;
|
||||
int curr = addr;
|
||||
|
|
@ -1088,78 +1091,115 @@ void GetReferences(unsigned char *mem, size_t bytes, bool acc_16, bool ind_16, i
|
|||
arg_size = ind_16 ? 2 : 1;
|
||||
break;
|
||||
}
|
||||
if (arg_size > bytes)
|
||||
break; // ended on partial instruction
|
||||
addr += arg_size;
|
||||
bytes -= arg_size;
|
||||
mem += arg_size;
|
||||
if (curr == refs[curr_label].address)
|
||||
|
||||
if (curr == refs[curr_label].address) {
|
||||
std::vector<RefLink> &pRefs = *refs[curr_label].pRefs;
|
||||
if (curr_label < (int)refs.size()) {
|
||||
bool prev_data = was_data;
|
||||
was_data = separator && !(!was_data && op==0x4c && prev_op==0x4c);
|
||||
for (size_t j = 0; j<pRefs.size(); ++j) {
|
||||
RefType type = pRefs[j].type;
|
||||
if (!(pRefs[j].instr_addr>curr && type == RT_BRANCH) && type != RT_DATA) {
|
||||
separator = false;
|
||||
was_data = false;
|
||||
prev_data = false;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (!was_data && prev_data) {
|
||||
bool only_data_ref = pRefs.size() ? true : false;
|
||||
for (size_t j = 0; j<pRefs.size(); ++j) {
|
||||
RefType type = pRefs[j].type;
|
||||
int ref_addr = pRefs[j].instr_addr;
|
||||
if (type != RT_DATA && (type != RT_BRANCH || ref_addr<addr)) {
|
||||
only_data_ref = false;
|
||||
if (type != RT_BRANCH)
|
||||
separator = false;
|
||||
}
|
||||
}
|
||||
was_data = only_data_ref;
|
||||
}
|
||||
refs[curr_label].data = was_data;
|
||||
if (was_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) {
|
||||
std::vector<RefLink> &pRefs = *refs[k].pRefs;
|
||||
std::vector<RefLink>::iterator r = pRefs.begin();
|
||||
while (r != pRefs.end()) {
|
||||
if (r->instr_addr>=start && r->instr_addr<end)
|
||||
r = pRefs.erase(r);
|
||||
else
|
||||
++r;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
curr_label++;
|
||||
}
|
||||
else if (curr > refs[curr_label].address && prev_addr>=0) {
|
||||
refs[curr_label].address = prev_addr;
|
||||
curr_label++;
|
||||
}
|
||||
prev_addr = curr;
|
||||
}
|
||||
|
||||
// mark segments as code or data
|
||||
mem = mem_orig;
|
||||
bytes = bytes_orig;
|
||||
addr = addr_orig;
|
||||
bool separator = false;
|
||||
bool was_data = false;
|
||||
curr_label = 0;
|
||||
while (bytes && curr_label<refs.size()) {
|
||||
unsigned char op = *mem++;
|
||||
int curr = addr;
|
||||
bytes--;
|
||||
addr++;
|
||||
|
||||
int arg_size = opcodes[op].arg_size;;
|
||||
int mode = 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;
|
||||
bytes -= arg_size;
|
||||
mem += arg_size;
|
||||
while (curr_label<refs.size() && curr == refs[curr_label].address) {
|
||||
struct RefAddr &ref = refs[curr_label];
|
||||
if ((was_data || separator) && ref.pRefs && ref.pRefs->size() && (*ref.pRefs)[0].type == RT_DATA) {
|
||||
was_data = true;
|
||||
for (int j = 1; was_data && j<ref.pRefs->size(); j++)
|
||||
was_data = (*ref.pRefs)[0].type == RT_DATA;
|
||||
} else
|
||||
was_data = false;
|
||||
refs[curr_label].data = was_data;
|
||||
curr_label++;
|
||||
}
|
||||
|
||||
separator = false;
|
||||
if (op == 0x60 || op == 0x40 || op == 0x68 || op == 0x4c || op == 0x6c || op == 0x7c || op == 0x5c || op == 0xdc) { // rts, rti, rtl or jmp
|
||||
separator = true;
|
||||
for (size_t i = 0; i<refs.size(); i++) { // check no branch crossing
|
||||
std::vector<RefLink> &pRefs = *refs[i].pRefs;
|
||||
if (refs[i].address<=curr) {
|
||||
for (size_t j = 0; j<pRefs.size() && separator; ++j) {
|
||||
if (pRefs[j].type == RT_BRANCH && pRefs[j].instr_addr>curr) {
|
||||
separator = false;
|
||||
break;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
for (size_t j = 0; j<pRefs.size() && separator; ++j) {
|
||||
if (pRefs[j].type == RT_BRANCH && pRefs[j].instr_addr<curr) {
|
||||
separator = false;
|
||||
break;
|
||||
// after a separator if there is no jmp, jsr, brl begin data block
|
||||
if (!was_data) {
|
||||
if (op == 0x60 || op == 0x40 || op == 0x68 || op == 0x4c || op == 0x6c ||
|
||||
op == 0x7c || op == 0x5c || op == 0xdc) { // rts, rti, rtl or jmp
|
||||
separator = true;
|
||||
for (size_t i = curr_label+1; i<refs.size() && (refs[i].address-curr)<0x7e; i++) { // check no branch crossing
|
||||
if (refs[i].address<=curr) {
|
||||
std::vector<RefLink> &pRefs = *refs[i].pRefs;
|
||||
for (size_t j = 0; j<pRefs.size() && separator; ++j) {
|
||||
if (pRefs[j].type == RT_BRANCH && pRefs[j].instr_addr>curr) {
|
||||
separator = false;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
prev_op = op;
|
||||
prev_addr = curr;
|
||||
}
|
||||
|
||||
|
||||
int last = (int)refs.size()-1;
|
||||
while (last>1 && refs[last-1].data) {
|
||||
int start_addr = refs[last].address;
|
||||
for (int k = 0; k<(int)refs.size(); ++k) {
|
||||
std::vector<RefLink> &pRefs = *refs[k].pRefs;
|
||||
std::vector<RefLink>::iterator r = pRefs.begin();
|
||||
while (r != pRefs.end()) {
|
||||
if (r->instr_addr>=start_addr && r->instr_addr<end_addr)
|
||||
r = pRefs.erase(r);
|
||||
else
|
||||
++r;
|
||||
}
|
||||
}
|
||||
last--;
|
||||
if (last<=1 || !refs[last].data)
|
||||
break;
|
||||
}
|
||||
|
||||
std::vector<RefAddr>::iterator k = refs.begin();
|
||||
if (k != refs.end())
|
||||
++k; // don't delete the initial label
|
||||
while (k!=refs.end()) {
|
||||
if (k->pRefs && k->pRefs->size()==0) {
|
||||
delete k->pRefs;
|
||||
k = refs.erase(k);
|
||||
} else
|
||||
++k;
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -1189,10 +1229,11 @@ void Disassemble(strref filename, unsigned char *mem, size_t bytes, bool acc_16,
|
|||
bool separator = false;
|
||||
bool is_data = false;
|
||||
strown<256> out;
|
||||
int prev_op = 255;
|
||||
while (bytes) {
|
||||
|
||||
bool data_to_code = false;
|
||||
// Determine if current address is referenced from somewhere
|
||||
while (curr_label_index<refs.size() && addr == refs[curr_label_index].address) {
|
||||
while (curr_label_index<refs.size() && addr >= refs[curr_label_index].address) {
|
||||
struct RefAddr &ref = refs[curr_label_index];
|
||||
if (ref.pRefs) {
|
||||
for (size_t j = 0; j<ref.pRefs->size(); ++j) {
|
||||
|
|
@ -1216,13 +1257,18 @@ void Disassemble(strref filename, unsigned char *mem, size_t bytes, bool acc_16,
|
|||
out.sprintf("%sLabel_%d: ; $%04x\n", spc, curr_label_index, addr);
|
||||
fputs(out.c_str(), f);
|
||||
is_data = !!refs[curr_label_index].data;
|
||||
data_to_code = !is_data;
|
||||
separator = false;
|
||||
curr_label_index++;
|
||||
if (curr_label_index < (int)refs.size() && refs[curr_label_index].data)
|
||||
data_to_code = false;
|
||||
}
|
||||
if (src && is_data) {
|
||||
if (src && (is_data || separator)) {
|
||||
out.clear();
|
||||
int left = end_addr - addr;
|
||||
if (curr_label_index < (int)refs.size())
|
||||
if (curr_label_index<(int)refs.size())
|
||||
left = refs[curr_label_index].address - addr;
|
||||
is_data = true;
|
||||
for (int i = 0; i<left; i++) {
|
||||
if (!(i&0xf)) {
|
||||
if (i) {
|
||||
|
|
@ -1241,6 +1287,8 @@ void Disassemble(strref filename, unsigned char *mem, size_t bytes, bool acc_16,
|
|||
out.append("\n");
|
||||
fputs(out.c_str(), f);
|
||||
}
|
||||
separator = false;
|
||||
prev_op = 255;
|
||||
} else {
|
||||
int curr_addr = addr;
|
||||
unsigned char op = *mem++;
|
||||
|
|
@ -1286,7 +1334,8 @@ void Disassemble(strref filename, unsigned char *mem, size_t bytes, bool acc_16,
|
|||
|
||||
int reference = -1;
|
||||
separator = false;
|
||||
if (op == 0x60 || op == 0x40 || op == 0x68 || op == 0x4c || op == 0x6c || op == 0x7c || op == 0x5c || op == 0xdc) { // rts, rti, rtl or jmp
|
||||
if (op == 0x60 || op == 0x40 || op == 0x68 || (op == 0x4c && mem[arg_size] != 0x4c) ||
|
||||
op == 0x6c || op == 0x7c || op == 0x5c || op == 0xdc) { // rts, rti, rtl or jmp
|
||||
separator = true;
|
||||
for (size_t i = 0; i<refs.size(); i++) {
|
||||
std::vector<RefLink> &pRefs = *refs[i].pRefs;
|
||||
|
|
@ -1397,11 +1446,12 @@ void Disassemble(strref filename, unsigned char *mem, size_t bytes, bool acc_16,
|
|||
mem += arg_size;
|
||||
out.append('\n');
|
||||
fputs(out.c_str(), f);
|
||||
if (separator) {
|
||||
fputs("\n", f);
|
||||
fputs(spc, f);
|
||||
fprintf(f, "; ------------- $%04x ------------- ;\n\n", addr);
|
||||
}
|
||||
prev_op = op;
|
||||
}
|
||||
if (separator || ((curr_label_index)<refs.size() && refs[curr_label_index].address==addr && is_data && !refs[curr_label_index].data)) {
|
||||
fputs("\n", f);
|
||||
fputs(spc, f);
|
||||
fprintf(f, "; ------------- $%04x ------------- ;\n\n", addr);
|
||||
}
|
||||
}
|
||||
if (opened)
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user