[llvm-objdump] Support detection of feature bits from the object and implement this for Mips.
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
diff --git a/llvm/lib/Object/ELFObjectFile.cpp b/llvm/lib/Object/ELFObjectFile.cpp
index c7df30a..4bd69e3 100644
--- a/llvm/lib/Object/ELFObjectFile.cpp
+++ b/llvm/lib/Object/ELFObjectFile.cpp
@@ -55,4 +55,71 @@
return std::move(R);
}
+SubtargetFeatures ELFObjectFileBase::getFeatures() const {
+ switch (getEMachine()) {
+ case ELF::EM_MIPS: {
+ SubtargetFeatures Features;
+ unsigned PlatformFlags;
+ getPlatformFlags(PlatformFlags);
+
+ switch (PlatformFlags & ELF::EF_MIPS_ARCH) {
+ case ELF::EF_MIPS_ARCH_1:
+ break;
+ case ELF::EF_MIPS_ARCH_2:
+ Features.AddFeature("mips2");
+ break;
+ case ELF::EF_MIPS_ARCH_3:
+ Features.AddFeature("mips3");
+ break;
+ case ELF::EF_MIPS_ARCH_4:
+ Features.AddFeature("mips4");
+ break;
+ case ELF::EF_MIPS_ARCH_5:
+ Features.AddFeature("mips5");
+ break;
+ case ELF::EF_MIPS_ARCH_32:
+ Features.AddFeature("mips32");
+ break;
+ case ELF::EF_MIPS_ARCH_64:
+ Features.AddFeature("mips64");
+ break;
+ case ELF::EF_MIPS_ARCH_32R2:
+ Features.AddFeature("mips32r2");
+ break;
+ case ELF::EF_MIPS_ARCH_64R2:
+ Features.AddFeature("mips64r2");
+ break;
+ case ELF::EF_MIPS_ARCH_32R6:
+ Features.AddFeature("mips32r6");
+ break;
+ case ELF::EF_MIPS_ARCH_64R6:
+ Features.AddFeature("mips64r6");
+ break;
+ default:
+ llvm_unreachable("Unknown EF_MIPS_ARCH value");
+ }
+
+ switch (PlatformFlags & ELF::EF_MIPS_MACH) {
+ case ELF::EF_MIPS_MACH_NONE:
+ // No feature associated with this value.
+ break;
+ case ELF::EF_MIPS_MACH_OCTEON:
+ Features.AddFeature("cnmips");
+ break;
+ default:
+ llvm_unreachable("Unknown EF_MIPS_ARCH value");
+ }
+
+ if (PlatformFlags & ELF::EF_MIPS_ARCH_ASE_M16)
+ Features.AddFeature("mips16");
+ if (PlatformFlags & ELF::EF_MIPS_MICROMIPS)
+ Features.AddFeature("micromips");
+
+ return Features;
+ }
+ default:
+ return SubtargetFeatures();
+ }
+}
+
} // end namespace llvm