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[llvm-xray] Add AArch64 to llvm-xray extract 

This required adding support for resolving R_AARCH64_ABS64 relocations to
get accurate addresses for function names to resolve.

Authored by: ianlevesque (Ian Levesque)
Reviewers: dberris, phosek, smeenai, tetsuo-cpp
Differential Revision: https://reviews.llvm.org/D69967
This commit is contained in:
Aditya Kumar 2019-11-07 21:20:34 -08:00
parent f96de25739
commit 1d321434a2
1 changed files with 17 additions and 5 deletions
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22
llvm/lib/XRay/InstrumentationMap.cpp
View File

@ -20,6 +20,7 @@
#include "llvm/Object/Binary.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Object/RelocationResolver.h"
#include "llvm/Support/DataExtractor.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/FileSystem.h"
@ -59,7 +60,8 @@ loadObj(StringRef Filename, object::OwningBinary<object::ObjectFile> &ObjFile,
// Find the section named "xray_instr_map".
if ((!ObjFile.getBinary()->isELF() && !ObjFile.getBinary()->isMachO()) ||
!(ObjFile.getBinary()->getArch() == Triple::x86_64 ||
ObjFile.getBinary()->getArch() == Triple::ppc64le))
ObjFile.getBinary()->getArch() == Triple::ppc64le ||
ObjFile.getBinary()->getArch() == Triple::aarch64))
return make_error<StringError>(
"File format not supported (only does ELF and Mach-O little endian 64-bit).",
std::make_error_code(std::errc::not_supported));
@ -99,12 +101,22 @@ loadObj(StringRef Filename, object::OwningBinary<object::ObjectFile> &ObjFile,
return static_cast<uint32_t>(0);
}(ObjFile.getBinary());
bool (*SupportsRelocation)(uint64_t);
object::RelocationResolver Resolver;
std::tie(SupportsRelocation, Resolver) =
object::getRelocationResolver(*ObjFile.getBinary());
for (const object::SectionRef &Section : Sections) {
for (const object::RelocationRef &Reloc : Section.relocations()) {
if (Reloc.getType() != RelativeRelocation)
continue;
if (auto AddendOrErr = object::ELFRelocationRef(Reloc).getAddend())
Relocs.insert({Reloc.getOffset(), *AddendOrErr});
if (SupportsRelocation && SupportsRelocation(Reloc.getType())) {
auto AddendOrErr = object::ELFRelocationRef(Reloc).getAddend();
auto A = AddendOrErr ? *AddendOrErr : 0;
uint64_t resolved = Resolver(Reloc, Reloc.getSymbol()->getValue(), A);
Relocs.insert({Reloc.getOffset(), resolved});
} else if (Reloc.getType() == RelativeRelocation) {
if (auto AddendOrErr = object::ELFRelocationRef(Reloc).getAddend())
Relocs.insert({Reloc.getOffset(), *AddendOrErr});
}
}
}
}