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Pull in r372513 from upstream lld trunk (by Simon Atanasyan):

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[mips] Deduce MIPS specific ELF header flags from `emulation`

  In case of linking binary blobs which do not have any ELF headers, we
  can deduce MIPS ABI ELF header flags from an `emulation` option.

  Patch by Kyle Evans.

Requested by:	kevans :)
This commit is contained in:
Dimitry Andric 2019-09-22 17:31:27 +00:00
parent f05b9584fa
commit 6d3bb28257
1 changed files with 19 additions and 1 deletions
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20
contrib/llvm/tools/lld/ELF/Arch/MipsArchTree.cpp
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@ -294,12 +294,30 @@ static uint32_t getArchFlags(ArrayRef<FileFlags> files) {
return ret;
}
// If we don't have any input files, we'll have to rely on the information we
// can derive from emulation information, since this at least gets us ABI.
static uint32_t getFlagsFromEmulation() {
uint32_t ret = 0;
if (config->emulation.empty())
return 0;
if (config->ekind == ELF32BEKind || config->ekind == ELF32LEKind) {
if (config->mipsN32Abi)
ret |= EF_MIPS_ABI2;
else
ret |= EF_MIPS_ABI_O32;
}
return ret;
}
template <class ELFT> uint32_t elf::calcMipsEFlags() {
std::vector<FileFlags> v;
for (InputFile *f : objectFiles)
v.push_back({f, cast<ObjFile<ELFT>>(f)->getObj().getHeader()->e_flags});
if (v.empty())
return 0;
return getFlagsFromEmulation();
checkFlags(v);
return getMiscFlags(v) | getPicFlags(v) | getArchFlags(v);
}