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[ELF] Initial migration of AVR target

Browse Source 
Reviewers: ruiu, rafael, grimar, atanasyan, psmith, dylanmckay

Reviewed By: ruiu, rafael, grimar, dylanmckay

Differential Revision: https://reviews.llvm.org/D32991

llvm-svn: 305444
This commit is contained in:
Leslie Zhai 2017-06-15 02:27:50 +00:00
parent 6af1b7d95c
commit 49ba795d15
4 changed files with 53 additions and 0 deletions
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2
lld/ELF/InputFiles.cpp
View File

@ -821,6 +821,8 @@ static uint8_t getBitcodeMachineKind(StringRef Path, const Triple &T) {
case Triple::arm:
case Triple::thumb:
return EM_ARM;
case Triple::avr:
return EM_AVR;
case Triple::mips:
case Triple::mipsel:
case Triple::mips64:

35
lld/ELF/Target.cpp
View File

@ -230,6 +230,13 @@ public:
void relocateOne(uint8_t *Loc, uint32_t Type, uint64_t Val) const override;
};
class AVRTargetInfo final : public TargetInfo {
public:
RelExpr getRelExpr(uint32_t Type, const SymbolBody &S,
const uint8_t *Loc) const override;
void relocateOne(uint8_t *Loc, uint32_t Type, uint64_t Val) const override;
};
template <class ELFT> class MipsTargetInfo final : public TargetInfo {
public:
MipsTargetInfo();
@ -260,6 +267,8 @@ TargetInfo *createTarget() {
return make<AMDGPUTargetInfo>();
case EM_ARM:
return make<ARMTargetInfo>();
case EM_AVR:
return make<AVRTargetInfo>();
case EM_MIPS:
switch (Config->EKind) {
case ELF32LEKind:
@ -2046,6 +2055,32 @@ int64_t ARMTargetInfo::getImplicitAddend(const uint8_t *Buf,
}
}
RelExpr AVRTargetInfo::getRelExpr(uint32_t Type, const SymbolBody &S,
const uint8_t *Loc) const {
switch (Type) {
case R_AVR_CALL:
return R_ABS;
default:
error(toString(S.File) + ": unknown relocation type: " + toString(Type));
return R_HINT;
}
}
void AVRTargetInfo::relocateOne(uint8_t *Loc, uint32_t Type,
uint64_t Val) const {
switch (Type) {
case R_AVR_CALL: {
uint16_t Hi = Val >> 17;
uint16_t Lo = Val >> 1;
write16le(Loc, read16le(Loc) | ((Hi >> 1) << 4) | (Hi & 1));
write16le(Loc + 2, Lo);
break;
}
default:
error(getErrorLocation(Loc) + "unrecognized reloc " + toString(Type));
}
}
template <class ELFT> MipsTargetInfo<ELFT>::MipsTargetInfo() {
GotPltHeaderEntriesNum = 2;
DefaultMaxPageSize = 65536;

14
lld/test/ELF/basic-avr.s Normal file
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@ -0,0 +1,14 @@
# REQUIRES: avr
# RUN: llvm-mc -filetype=obj -triple=avr-unknown-linux -mcpu=atmega328p %s -o %t.o
# RUN: ld.lld %t.o -o %t.exe -Ttext=0
# RUN: llvm-objdump -d %t.exe | FileCheck %s
main:
call foo
foo:
jmp foo
# CHECK: main:
# CHECK-NEXT: 0: 0e 94 02 00 <unknown>
# CHECK: foo:
# CHECK-NEXT: 4: 0c 94 02 00 <unknown>

2
lld/test/lit.cfg
View File

@ -247,6 +247,8 @@ if re.search(r'AArch64', archs):
config.available_features.add('aarch64')
if re.search(r'ARM', archs):
config.available_features.add('arm')
if re.search(r'AVR', archs):
config.available_features.add('avr')
if re.search(r'Mips', archs):
config.available_features.add('mips')
if re.search(r'X86', archs):