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fix link bug with custom segments.

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This commit is contained in:
Kelvin Sherlock 2017-01-16 16:16:33 -05:00
parent 03f24ec829
commit eed6958275
1 changed files with 48 additions and 9 deletions
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57
link.cpp
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@ -279,8 +279,6 @@ void one_module(const std::vector<uint8_t> &data,
std::array<int, 256> remap_section;
int current_section = SECT_CODE;
std::vector<uint8_t> *data_ptr = &sections[current_section].data;
std::fill(remap_section.begin(), remap_section.end(), -1);
remap_section[SECT_PAGE0] = SECT_PAGE0;
@ -292,22 +290,29 @@ void one_module(const std::vector<uint8_t> &data,
std::vector<section> local_sections = read_sections(section_data);
std::vector<symbol> local_symbols = read_symbols(symbol_data);
// convert local sections to global
for (auto &s : local_sections) {
//printf("section %20s %d\n", s.name.c_str(), s.number);
if (s.number <= SECT_UDATA) {
sections[s.number].size += s.size; // for page0 / udata sections.
continue;
}
// todo -- should install section name as global symbol?
auto iter = section_map.find(s.name);
if (iter == section_map.end()) {
int virtual_section = sections.size();
remap_section[s.number] = virtual_section;
s.number = virtual_section;
sections.emplace_back(s);
symbol_map.emplace(s.name, virtual_section);
section_map.emplace(s.name, virtual_section);
} else {
auto &ss = sections[iter->second];
assert(ss.flags == s.flags); // check org????
@ -319,8 +324,19 @@ void one_module(const std::vector<uint8_t> &data,
}
}
// convert local symbols to global.
for (auto &s : local_symbols) {
if (flags._v) {
const char *status = "";
if (s.type == S_UND) status = "extern";
else if (s.flags & SF_GBL) status = "public";
else status = "private";
fprintf(stderr, " %-20s [%s]\n", s.name.c_str(), status);
}
if (s.type == S_UND) {
@ -328,12 +344,17 @@ void one_module(const std::vector<uint8_t> &data,
if (iter == symbol_map.end()) {
s.section = symbols.size();
symbol_map.emplace(s.name, s.section);
symbols.emplace_back(s);
undefined_symbols.emplace(s.name);
fprintf(stderr, "Adding %s to undefined symbols\n", s.name.c_str());
}
else {
// already exists...
const auto &ss = symbols[iter->second];
if (ss.type != S_UND) s = ss;
/* if (ss.type != S_UND) */
// always copy over since s.section is a big deal.
s = ss;
}
if (local_undefined) {
@ -352,10 +373,11 @@ void one_module(const std::vector<uint8_t> &data,
s.section = -1;
}
constexpr const unsigned mask = SF_GBL | SF_DEF;
if ((s.flags & mask) == mask) {
auto iter = symbol_map.find(s.name);
if (iter == symbol_map.end()) {
@ -383,6 +405,10 @@ void one_module(const std::vector<uint8_t> &data,
}
// set it here. sections may be resized above.
int current_section = SECT_CODE;
std::vector<uint8_t> *data_ptr = &sections[current_section].data;
auto iter = data.begin();
for(;;) {
@ -451,6 +477,7 @@ void one_module(const std::vector<uint8_t> &data,
e.stack.emplace_back(OP_SYM, 0, s.section); /* section is actually a symbol number */
e.undefined = true;
break;
case S_REL:
e.stack.emplace_back(OP_LOC, s.offset, s.section);
break;
@ -584,6 +611,7 @@ void init() {
symbol_map.emplace(s.name, i * 2 + 1);
symbols.emplace_back(s);
}
}
@ -1192,6 +1220,7 @@ bool intersection(const std::map<std::string, uint32_t> &a,
while (a_iter != a.end() && b_iter != b.end()) {
//fprintf(stderr, "comparing %s - %s\n", a_iter->first.c_str(), b_iter->c_str());
int cmp = strcmp(a_iter->first.c_str(), b_iter->c_str());
if (cmp < 0) a_iter++;
else if (cmp > 0) b_iter++;
@ -1252,7 +1281,7 @@ bool one_lib(const std::string &path) {
// read the symbol dictionary.
std::vector<uint8_t> data;
data.reserve(h.l_modstart - sizeof(h));
data.resize(h.l_modstart - sizeof(h));
ok = read(fd, data.data(), data.size());
if (ok != data.size()) {
warnx("Invalid library file: %s", path.c_str());
@ -1268,8 +1297,9 @@ bool one_lib(const std::string &path) {
// fileno, pstring file name
uint16_t fileno = read_16(iter);
uint8_t size = read_8(iter);
iter += size; // don't care about the name.
std::string s = read_pstring(iter);
//uint8_t size = read_8(iter);
//iter += size; // don't care about the name.
}
std::map<std::string, uint32_t> lib_symbol_map;
@ -1337,7 +1367,8 @@ void libraries() {
for (auto &l : flags._l) {
for (auto &L : flags._L) {
std::string path = L + "lib" + l;
//std::string path = L + "lib" + l;
std::string path = L + l + ".lib";
if (one_lib(path)) break;
}
@ -1482,6 +1513,14 @@ int main(int argc, char **argv) {
if (!undefined_symbols.empty()) libraries();
//
if (!undefined_symbols.empty()) {
fprintf(stderr, "Unable to resolve the following symbols:\n");
for (auto &s : undefined_symbols) fprintf(stderr, "%s\n", s.c_str());
exit(EX_DATAERR);
}
generate_end();
simplify();