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[llvm-objdump] Support detection of feature bits from the object and implement this for Mips.

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Summary:
The Mips implementation only covers the feature bits described by the ELF
e_flags so far. Mips stores additional feature bits such as MSA in the
.MIPS.abiflags section.

Also fixed a small bug this revealed where microMIPS wouldn't add the
EF_MIPS_MICROMIPS flag when using -filetype=obj.

Reviewers: echristo, rafael

Subscribers: rafael, mehdi_amini, dsanders, sdardis, llvm-commits

Differential Revision: http://reviews.llvm.org/D21125

llvm-svn: 272880
This commit is contained in:
Daniel Sanders
2016-06-16 09:17:03 +00:00
parent 139ffba398
commit 1d14864bb3
23 changed files with 122 additions and 95 deletions
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6
llvm/tools/llvm-objdump/llvm-objdump.cpp
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@@ -931,12 +931,10 @@ static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
const Target *TheTarget = getTarget(Obj);
// Package up features to be passed to target/subtarget
std::string FeaturesStr;
SubtargetFeatures Features = Obj->getFeatures();
if (MAttrs.size()) {
SubtargetFeatures Features;
for (unsigned i = 0; i != MAttrs.size(); ++i)
Features.AddFeature(MAttrs[i]);
FeaturesStr = Features.getString();
}
std::unique_ptr<const MCRegisterInfo> MRI(
@@ -950,7 +948,7 @@ static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
if (!AsmInfo)
report_fatal_error("error: no assembly info for target " + TripleName);
std::unique_ptr<const MCSubtargetInfo> STI(
TheTarget->createMCSubtargetInfo(TripleName, MCPU, FeaturesStr));
TheTarget->createMCSubtargetInfo(TripleName, MCPU, Features.getString()));
if (!STI)
report_fatal_error("error: no subtarget info for target " + TripleName);
std::unique_ptr<const MCInstrInfo> MII(TheTarget->createMCInstrInfo());