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add _BEG_xxx / _END_xxx symbols for all sections.

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This commit is contained in:
Kelvin Sherlock 2017-01-20 22:12:44 -05:00
parent dd0a369ac1
commit b29b208b06
1 changed files with 82 additions and 2 deletions
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84
link.cpp
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@ -410,6 +410,11 @@ void simplify() {
*
*/
std::string &upper_case(std::string &s) {
std::transform(s.begin(), s.end(), s.begin(), std::toupper);
return s;
}
void one_module(const std::vector<uint8_t> &data,
const std::vector<uint8_t> &section_data,
const std::vector<uint8_t> &symbol_data,
@ -448,6 +453,63 @@ void one_module(const std::vector<uint8_t> &data,
int virtual_section = sections.size();
remap_section[s.number] = virtual_section;
s.number = virtual_section;
if (!(s.flags & SEC_NONAME)) {
/* generate an _BEG_name_ and _END_name */
symbol sym;
sym.name = "_BEG_" + s.name;
upper_case(sym.name);
sym.section = virtual_section;
sym.type = S_REL; // check if section has offset?
sym.flags = SF_DEF | SF_GBL;
auto iter = symbol_map.find(sym.name);
if (iter == symbol_map.end()) {
symbol_map.emplace(sym.name, symbols.size());
symbols.emplace_back(std::move(sym));
} else {
// duplicate label error...
}
// add entry for name? or handle via undefined symbol lookup below?
sym.name = s.name;
sym.section = virtual_section;
sym.type = S_REL;
sym.flags = SF_DEF | SF_GBL;
iter = symbol_map.find(sym.name);
if (iter == symbol_map.end()) {
symbol_map.emplace(sym.name, symbols.size());
symbols.emplace_back(std::move(sym));
} else {
// duplicate label error...
}
sym.name = "_END_" + s.name;
upper_case(sym.name);
sym.section = symbols.size();
sym.type = S_UND;
sym.flags = 0;
iter = symbol_map.find(sym.name);
if (iter == symbol_map.end()) {
s.end_symbol = sym.section;
symbol_map.emplace(sym.name, sym.section);
symbols.emplace_back(std::move(sym));
} else {
// duplicate label...
}
}
sections.emplace_back(s);
section_map.emplace(s.name, virtual_section);
@ -757,10 +819,13 @@ void init() {
s.type = S_UND;
s.flags = 0;
symbol_map.emplace(s.name, i * 2 + 1);
sections[i].end_symbol = s.section;
symbol_map.emplace(s.name, s.section);
symbols.emplace_back(s);
// even though it's undefined, don't add it to the undefined list ...
// don't need to search libraries for it!
}
}
@ -777,6 +842,7 @@ void generate_end() {
"_END_UDATA"
};
*/
/*
for (int i = 0; i < 5; ++i) {
symbol s;
s.section = i;
@ -786,6 +852,20 @@ void generate_end() {
symbols[i * 2 + 1] = s;
}
*/
for (const auto &s : sections) {
if (!s.end_symbol) continue;
symbol &sym = symbols[s.end_symbol];
sym.section = s.number;
sym.type = S_REL;
sym.flags = SF_DEF | SF_GBL;
sym.offset = s.size;
}
}