mirror of
https://github.com/rui314/mold.git
synced 2024-09-22 02:20:51 +03:00
122 lines
3.2 KiB
C++
122 lines
3.2 KiB
C++
#include "mold.h"
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using namespace llvm;
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using namespace llvm::ELF;
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std::atomic_int num_relocs;
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InputSection::InputSection(ObjectFile *file, const ELF64LE::Shdr &shdr, StringRef name)
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: file(file), shdr(shdr) {
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this->name = name;
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this->output_section = OutputSection::get_instance(name, shdr.sh_flags, shdr.sh_type);
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u64 align = (shdr.sh_addralign == 0) ? 1 : shdr.sh_addralign;
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if (align > UINT32_MAX)
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error(toString(file) + ": section sh_addralign is too large");
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if (__builtin_popcount(align) != 1)
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error(toString(file) + ": section sh_addralign is not a power of two");
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}
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void InputSection::copy_to(u8 *buf) {
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if (shdr.sh_type == SHT_NOBITS || shdr.sh_size == 0)
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return;
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ArrayRef<u8> data = check(file->obj.getSectionContents(shdr));
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buf = buf + output_section->shdr.sh_offset + offset;
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memcpy_nontemporal(buf, &data[0], data.size());
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}
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std::tuple<u64, u64> InputSection::scan_relocations() {
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uint64_t num_got = 0;
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uint64_t num_plt = 0;
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for (const ELF64LE::Rela &rel : rels) {
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Symbol *sym = file->get_symbol(rel.getSymbol(false));
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if (!sym || !sym->file)
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continue;
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switch (rel.getType(false)) {
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case R_X86_64_GOT32:
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case R_X86_64_GOT64:
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case R_X86_64_GOTOFF64:
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case R_X86_64_GOTPC32:
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case R_X86_64_GOTPC32_TLSDESC:
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case R_X86_64_GOTPC64:
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case R_X86_64_GOTPCREL:
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case R_X86_64_GOTPCRELX:
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case R_X86_64_GOTTPOFF:
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case R_X86_64_REX_GOTPCRELX:
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num_got += !sym->needs_got.exchange(true);
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break;
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#if 0
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case R_X86_64_PLT32:
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num_got += !sym->needs_got.exchange(true);
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num_plt += !sym->needs_plt.exchange(true);
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break;
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#endif
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}
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}
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return {num_got, num_plt};
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}
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void InputSection::relocate(u8 *buf) {
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int i = 0;
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for (const ELF64LE::Rela &rel : rels) {
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u32 sym_idx = rel.getSymbol(false);
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u8 *loc = buf + output_section->shdr.sh_offset + offset + rel.r_offset;
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u64 cur = output_section->shdr.sh_addr + offset + rel.r_offset;
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Symbol *sym = file->get_symbol(sym_idx);
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u64 dst = sym ? sym->addr : file->get_symbol_addr(sym_idx);
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switch (rel.getType(false)) {
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case R_X86_64_8:
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*loc = dst;
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break;
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case R_X86_64_PC8:
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*loc = dst - cur;
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break;
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case R_X86_64_16:
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*(u16 *)loc = dst;
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break;
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case R_X86_64_PC16:
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*(u16 *)loc = dst - cur - 4;
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break;
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case R_X86_64_32:
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case R_X86_64_32S:
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*(u32 *)loc = dst;
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break;
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case R_X86_64_PC32:
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case R_X86_64_PLT32:
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*(u32 *)loc = dst - cur - 4;
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break;
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case R_X86_64_GOTPCRELX:
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case R_X86_64_REX_GOTPCRELX:
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case R_X86_64_GOTPCREL:
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case R_X86_64_GOTPC32:
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*(u32 *)loc = out::got->shdr.sh_addr + sym->got_addr - cur - 4;
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break;
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case R_X86_64_64:
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*(u64 *)loc = dst;
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break;
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case R_X86_64_PC64:
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*(u64 *)loc = dst - cur - 4;
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break;
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case R_X86_64_TLSGD:
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case R_X86_64_TLSLD:
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case R_X86_64_DTPOFF32:
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case R_X86_64_GOTTPOFF:
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case R_X86_64_TPOFF32:
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break;
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default:
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error(toString(this) + ": unknown relocation: " + std::to_string(rel.getType(false)));
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}
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// num_relocs++;
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}
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}
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std::string toString(InputSection *isec) {
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return (toString(isec->file) + ":(" + isec->name + ")").str();
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}
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