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[Mach-O] Output "hello world" program

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With this change, ld64.mold is able to emit a "hello world" program.

  $ ./ld64.mold -out hello
  $ ./hello
  Hello world
This commit is contained in:
Rui Ueyama 2021-09-18 20:54:43 +09:00
parent ded5d5e6a1
commit 76874d84ba
3 changed files with 10 additions and 7 deletions
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8
macho/dumper.cc
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@ -185,10 +185,10 @@ void dump_file(std::string path) {
<< "\n attr: 0x" << std::hex << sec[j].attr
<< "\n";
// if (sec[j].size) {
// std::cout << " contents: ";
// print_bytes(buf + sec[j].offset, sec[j].size);
// }
if (sec[j].size) {
std::cout << " contents: ";
print_bytes(buf + sec[j].offset, sec[j].size);
}
if (sec[j].reloff) {
MachRel *rel = (MachRel *)(buf + sec[j].reloff);

6
macho/mold.h
View File

@ -217,7 +217,7 @@ public:
StubsSection(OutputSegment &parent);
void copy_buf(Context &ctx) override;
std::vector<u8> contents = {0x40, 0x7c, 0x25, 0xff, 0x00, 0x00};
std::vector<u8> contents = {0xff, 0x25, 0x7c, 0x40, 0x00, 0x00};
};
class StubHelperSection : public OutputSection {
@ -226,8 +226,8 @@ public:
void copy_buf(Context &ctx) override;
std::vector<u8> contents = {
0x7d, 0x1d, 0x8d, 0x4c, 0x41, 0x00, 0x00, 0x40, 0x6d, 0x25, 0xff, 0x53,
0x90, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x68, 0xff, 0xe6, 0xe9, 0x00,
0x4c, 0x8d, 0x1d, 0x7d, 0x40, 0x00, 0x00, 0x41, 0x53, 0xff, 0x25, 0x6d,
0x00, 0x00, 0x00, 0x90, 0x68, 0x00, 0x00, 0x00, 0x00, 0xe9, 0xe6, 0xff,
0xff, 0xff,
};
};

3
macho/output-chunks.cc
View File

@ -359,6 +359,7 @@ StubsSection::StubsSection(OutputSegment &parent) : OutputSection(parent) {
hdr.type = S_SYMBOL_STUBS;
hdr.attr = S_ATTR_SOME_INSTRUCTIONS | S_ATTR_PURE_INSTRUCTIONS;
hdr.size = contents.size();
hdr.reserved2 = 6;
}
void StubsSection::copy_buf(Context &ctx) {
@ -405,6 +406,7 @@ GotSection::GotSection(OutputSegment &parent)
hdr.p2align = __builtin_ctz(8);
hdr.type = S_NON_LAZY_SYMBOL_POINTERS;
hdr.size = 8;
hdr.reserved1 = 1;
}
LaSymbolPtrSection::LaSymbolPtrSection(OutputSegment &parent)
@ -413,6 +415,7 @@ LaSymbolPtrSection::LaSymbolPtrSection(OutputSegment &parent)
hdr.p2align = __builtin_ctz(8);
hdr.type = S_LAZY_SYMBOL_POINTERS;
hdr.size = contents.size();
hdr.reserved1 = 2;
}
void LaSymbolPtrSection::copy_buf(Context &ctx) {