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[ELF] Allow target to configure ELF header flags in the output file

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The patch configure ELF header flags for MIPS target. For now the flags
are hard coded. In fact they depends on ELF flags of input object files
and selected emulation.

Differential Revision: http://reviews.llvm.org/D15575

llvm-svn: 256089
This commit is contained in:
Simon Atanasyan
2015-12-19 05:51:49 +00:00
parent b657449399
commit 034c4cd58a
4 changed files with 51 additions and 3 deletions
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12
lld/ELF/Writer.cpp
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@@ -1012,6 +1012,17 @@ template <class ELFT> int Writer<ELFT>::getPhdrsNum() const {
return I;
}
static uint32_t getELFFlags() {
if (Config->EMachine != EM_MIPS)
return 0;
// FIXME: In fact ELF flags depends on ELF flags of input object files
// and selected emulation. For now just use hadr coded values.
uint32_t V = EF_MIPS_ABI_O32 | EF_MIPS_CPIC | EF_MIPS_ARCH_32R2;
if (Config->Shared)
V |= EF_MIPS_PIC;
return V;
}
template <class ELFT> void Writer<ELFT>::writeHeader() {
uint8_t *Buf = Buffer->getBufferStart();
memcpy(Buf, "\177ELF", 4);
@@ -1033,6 +1044,7 @@ template <class ELFT> void Writer<ELFT>::writeHeader() {
EHdr->e_entry = getEntryAddr();
EHdr->e_phoff = sizeof(Elf_Ehdr);
EHdr->e_shoff = SectionHeaderOff;
EHdr->e_flags = getELFFlags();
EHdr->e_ehsize = sizeof(Elf_Ehdr);
EHdr->e_phentsize = sizeof(Elf_Phdr);
EHdr->e_phnum = Phdrs.size();