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Encoding of destination fixup for ARM branch and conditional branch

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instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118801 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach
2010-11-11 18:04:49 +00:00
parent 8a83d54528
commit c466b937db
5 changed files with 57 additions and 13 deletions
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14
lib/Target/ARM/ARMAsmBackend.cpp
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@@ -138,12 +138,13 @@ public:
}
};
static unsigned getFixupKindLog2Size(unsigned Kind) {
static unsigned getFixupKindNumBytes(unsigned Kind) {
switch (Kind) {
default: llvm_unreachable("Unknown fixup kind!");
case FK_Data_4: return 2;
case FK_Data_4: return 4;
case ARM::fixup_arm_pcrel_12: return 2;
case ARM::fixup_arm_vfp_pcrel_12: return 1;
case ARM::fixup_arm_branch: return 3;
}
}
@@ -156,16 +157,17 @@ static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
case ARM::fixup_arm_pcrel_12:
// ARM PC-relative values are offset by 8.
return Value - 8;
case ARM::fixup_arm_branch:
case ARM::fixup_arm_vfp_pcrel_12:
// The VFP ld/st immediate value doesn't encode the low two bits since
// they're always zero. Offset by 8 just as above.
// These values don't encode the low two bits since they're always zero.
// Offset by 8 just as above.
return (Value - 8) >> 2;
}
}
void DarwinARMAsmBackend::ApplyFixup(const MCFixup &Fixup, MCDataFragment &DF,
uint64_t Value) const {
unsigned NumBytes = getFixupKindLog2Size(Fixup.getKind());
uint64_t Value) const {
unsigned NumBytes = getFixupKindNumBytes(Fixup.getKind());
Value = adjustFixupValue(Fixup.getKind(), Value);
assert(Fixup.getOffset() + NumBytes <= DF.getContents().size() &&