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Right now all of the relocations are 32-bit dwarf, and the relocation

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information doesn't return an addend for Rel relocations. Go ahead
and use this information to fix relocation handling inside dwarfdump
for 32-bit ELF REL.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171126 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher 2012-12-27 01:07:07 +00:00
parent 5dd839430c
commit 32b3768ec1
3 changed files with 41 additions and 7 deletions
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34
include/llvm/Object/RelocVisitor.h
View File

@ -64,6 +64,18 @@ public:
HasError = true;
return RelocToApply();
}
} else if (FileFormat == "ELF32-i386") {
switch (RelocType) {
case llvm::ELF::R_386_NONE:
return visitELF_386_NONE(R);
case llvm::ELF::R_386_32:
return visitELF_386_32(R, Value);
case llvm::ELF::R_386_PC32:
return visitELF_386_PC32(R, Value, SecAddr);
default:
HasError = true;
return RelocToApply();
}
}
return RelocToApply();
}
@ -76,6 +88,28 @@ private:
/// Operations
/// 386-ELF
RelocToApply visitELF_386_NONE(RelocationRef R) {
return RelocToApply(0, 0);
}
// Ideally the Addend here will be the addend in the data for
// the relocation. It's not actually the case for Rel relocations.
RelocToApply visitELF_386_32(RelocationRef R, uint64_t Value) {
int64_t Addend;
R.getAdditionalInfo(Addend);
return RelocToApply(Value + Addend, 4);
}
RelocToApply visitELF_386_PC32(RelocationRef R, uint64_t Value,
uint64_t SecAddr) {
int64_t Addend;
R.getAdditionalInfo(Addend);
uint64_t Address;
R.getAddress(Address);
return RelocToApply(Value + Addend - Address, 4);
}
/// X86-64 ELF
RelocToApply visitELF_X86_64_NONE(RelocationRef R) {
return RelocToApply(0, 0);

7
lib/DebugInfo/DWARFFormValue.cpp
View File

@ -108,8 +108,8 @@ DWARFFormValue::extractValue(DataExtractor data, uint32_t *offset_ptr,
= cu->getContext().relocMap().find(*offset_ptr);
if (AI != cu->getContext().relocMap().end()) {
const std::pair<uint8_t, int64_t> &R = AI->second;
Value.uval = R.second;
*offset_ptr += R.first;
Value.uval = data.getUnsigned(offset_ptr, cu->getAddressByteSize()) +
R.second;
} else
Value.uval = data.getUnsigned(offset_ptr, cu->getAddressByteSize());
break;
@ -156,8 +156,7 @@ DWARFFormValue::extractValue(DataExtractor data, uint32_t *offset_ptr,
= cu->getContext().relocMap().find(*offset_ptr);
if (AI != cu->getContext().relocMap().end()) {
const std::pair<uint8_t, int64_t> &R = AI->second;
Value.uval = R.second;
*offset_ptr += R.first;
Value.uval = data.getU32(offset_ptr) + R.second;
} else
Value.uval = data.getU32(offset_ptr);
break;

7
test/DebugInfo/X86/2010-08-10-DbgConstant.ll
View File

@ -1,6 +1,7 @@
; RUN: llc -mtriple=i686-linux -O0 < %s | FileCheck %s
; CHECK: DW_TAG_constant
; CHECK-NEXT: .long .Lstring3 #{{#?}} DW_AT_name
; RUN: llc -mtriple=i686-linux -O0 -filetype=obj -o %t %s
; RUN: llvm-dwarfdump %t | FileCheck %s
; CHECK: DW_TAG_constant [4]
; CHECK-NEXT: DW_AT_name [DW_FORM_strp] ( .debug_str[0x0000002c] = "ro")
define void @foo() nounwind ssp {
entry: