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[ELF][MIPS] Support R_MIPS_HIGHER / R_MIPS_HIGHEST relocations calculation 

llvm-svn: 280223
This commit is contained in:
Simon Atanasyan 2016-08-31 11:47:21 +00:00
parent 97519cba2e
commit e5532a12f7
2 changed files with 41 additions and 0 deletions
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20
lld/ELF/Target.cpp
View File

@ -1966,6 +1966,20 @@ static void writeMipsHi16(uint8_t *Loc, uint64_t V) {
write32<E>(Loc, (Instr & 0xffff0000) | Res);
}
template <endianness E>
static void writeMipsHigher(uint8_t *Loc, uint64_t V) {
uint32_t Instr = read32<E>(Loc);
uint16_t Res = ((V + 0x80008000) >> 32) & 0xffff;
write32<E>(Loc, (Instr & 0xffff0000) | Res);
}
template <endianness E>
static void writeMipsHighest(uint8_t *Loc, uint64_t V) {
uint32_t Instr = read32<E>(Loc);
uint16_t Res = ((V + 0x800080008000) >> 48) & 0xffff;
write32<E>(Loc, (Instr & 0xffff0000) | Res);
}
template <endianness E>
static void writeMipsLo16(uint8_t *Loc, uint64_t V) {
uint32_t Instr = read32<E>(Loc);
@ -2150,6 +2164,12 @@ void MipsTargetInfo<ELFT>::relocateOne(uint8_t *Loc, uint32_t Type,
case R_MIPS_TLS_TPREL_HI16:
writeMipsHi16<E>(Loc, Val);
break;
case R_MIPS_HIGHER:
writeMipsHigher<E>(Loc, Val);
break;
case R_MIPS_HIGHEST:
writeMipsHighest<E>(Loc, Val);
break;
case R_MIPS_JALR:
// Ignore this optimization relocation for now
break;

21
lld/test/ELF/mips-higher-highest.s Normal file
View File

@ -0,0 +1,21 @@
# Check R_MIPS_HIGHER / R_MIPS_HIGHEST relocations calculation.
# RUN: llvm-mc -filetype=obj -triple=mips64-unknown-linux %s -o %t1.o
# RUN: llvm-mc -filetype=obj -triple=mips64-unknown-linux \
# RUN: %S/Inputs/mips-dynamic.s -o %t2.o
# RUN: ld.lld %t1.o %t2.o -o %t.exe
# RUN: llvm-objdump -d %t.exe | FileCheck %s
# REQUIRES: mips
.global __start
__start:
lui $6, %highest(_foo+0x300047FFF7FF7)
daddiu $6, $6, %higher(_foo+0x300047FFF7FF7)
lui $7, %highest(_foo+0x300047FFF7FF8)
ld $7, %higher (_foo+0x300047FFF7FF8)($7)
# CHECK: 20000: 3c 06 00 03 lui $6, 3
# CHECK-NEXT: 20004: 64 c6 00 05 daddiu $6, $6, 5
# CHECK-NEXT: 20008: 3c 07 00 03 lui $7, 3
# CHECK-NEXT: 2000c: dc e7 00 05 ld $7, 5($7)