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https://github.com/rui314/mold.git
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43 lines
1.3 KiB
C++
43 lines
1.3 KiB
C++
#include "mold.h"
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using namespace llvm;
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using namespace llvm::ELF;
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using llvm::object::ELF64LE;
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static std::unique_ptr<FileOutputBuffer> open_output_file() {
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int file_size = 100;
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Expected<std::unique_ptr<FileOutputBuffer>> bufferOrErr =
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FileOutputBuffer::create(config.output, file_size, 0);
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if (!bufferOrErr)
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error("failed to open " + config.output + ": " +
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llvm::toString(bufferOrErr.takeError()));
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return std::move(*bufferOrErr);
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}
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void write() {
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std::unique_ptr<FileOutputBuffer> buffer = open_output_file();
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uint8_t *buf = buffer->getBufferStart();
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memset(buf, 0, sizeof(ELF64LE::Ehdr));
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memcpy(buf, "\177ELF", 4);
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auto *ehdr = reinterpret_cast<ELF64LE::Ehdr *>(buf);
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ehdr->e_ident[EI_CLASS] = ELFCLASS64;
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ehdr->e_ident[EI_DATA] = ELFDATA2LSB;
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ehdr->e_ident[EI_VERSION] = EV_CURRENT;
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ehdr->e_ident[EI_OSABI] = 0;
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ehdr->e_ident[EI_ABIVERSION] = 0;
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ehdr->e_machine = EM_X86_64;
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ehdr->e_version = EV_CURRENT;
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ehdr->e_flags = 0;
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ehdr->e_ehsize = sizeof(ELF64LE::Ehdr);
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ehdr->e_phnum = 0;
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ehdr->e_shentsize = sizeof(ELF64LE::Shdr);
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ehdr->e_phoff = sizeof(ELF64LE::Ehdr);
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ehdr->e_phentsize = sizeof(ELF64LE::Phdr);
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if (auto e = buffer->commit())
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error("failed to write to the output file: " + toString(std::move(e)));
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}
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