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AArch64: Add basic relocation processing for llvm-dwarfdump.

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This allows llvm-dwarfdump to handle the relocations needed, at least
for LLVM-produced code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174874 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tim Northover 2013-02-11 11:16:02 +00:00
parent c37aa995e3
commit b05dc55460
3 changed files with 46 additions and 0 deletions
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30
include/llvm/Object/RelocVisitor.h
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@ -92,6 +92,16 @@ public:
HasError = true;
return RelocToApply();
}
} else if (FileFormat == "ELF64-aarch64") {
switch (RelocType) {
case llvm::ELF::R_AARCH64_ABS32:
return visitELF_AARCH64_ABS32(R, Value);
case llvm::ELF::R_AARCH64_ABS64:
return visitELF_AARCH64_ABS64(R, Value);
default:
HasError = true;
return RelocToApply();
}
}
HasError = true;
return RelocToApply();
@ -172,6 +182,26 @@ private:
uint32_t Res = (Value + Addend) & 0xFFFFFFFF;
return RelocToApply(Res, 4);
}
// AArch64 ELF
RelocToApply visitELF_AARCH64_ABS32(RelocationRef R, uint64_t Value) {
int64_t Addend;
R.getAdditionalInfo(Addend);
int64_t Res = Value + Addend;
// Overflow check allows for both signed and unsigned interpretation.
if (Res < INT32_MIN || Res > UINT32_MAX)
HasError = true;
return RelocToApply(static_cast<uint32_t>(Res), 4);
}
RelocToApply visitELF_AARCH64_ABS64(RelocationRef R, uint64_t Value) {
int64_t Addend;
R.getAdditionalInfo(Addend);
return RelocToApply(Value + Addend, 8);
}
};
}

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test/DebugInfo/Inputs/dwarfdump-test.elf-aarch64 Normal file
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16
test/DebugInfo/dwarfdump-aarch64.test Normal file
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@ -0,0 +1,16 @@
RUN: llvm-dwarfdump %p/Inputs/dwarfdump-test.elf-aarch64 \
RUN: | FileCheck %s
We're mostly checking that relocations are applied correctly
here. Currently R_AARCH64_ABS32 is used for references to debug data
and R_AARCH64_ABS64 is used for program addresses.
A couple of ABS32s, both at 0 and elsewhere, interpreted correctly:
CHECK: DW_AT_producer [DW_FORM_strp] ( .debug_str[0x00000000] = "clang version 3.3 ")
CHECK: DW_AT_name [DW_FORM_strp] ( .debug_str[0x00000013] = "tmp.c")
A couple of ABS64s similarly:
CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
CHECK: DW_AT_high_pc [DW_FORM_addr] (0x000000000000005c)