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[ELF][MIPS] Support R_MIPS_TLS_DTPREL_HI16/LO16 and R_MIPS_TLS_TPREL_HI16/LO16 relocations 

That is initial and the most trivial patch to support TLS for MIPS targets.

llvm-svn: 263712
This commit is contained in:
Simon Atanasyan 2016-03-17 12:36:08 +00:00
parent 60d0555004
commit a8e9cb38ae
2 changed files with 59 additions and 0 deletions
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20
lld/ELF/Target.cpp
View File

@ -1677,6 +1677,10 @@ void MipsTargetInfo<ELFT>::relocateOne(uint8_t *Loc, uint8_t *BufEnd,
uint32_t Type, uint64_t P, uint64_t S,
uint64_t ZA, uint8_t *PairedLoc) const {
const endianness E = ELFT::TargetEndianness;
// Thread pointer and DRP offsets from the start of TLS data area.
// https://www.linux-mips.org/wiki/NPTL
const uint32_t TPOffset = 0x7000;
const uint32_t DTPOffset = 0x8000;
switch (Type) {
case R_MIPS_32:
add32<E>(Loc, S);
@ -1747,6 +1751,18 @@ void MipsTargetInfo<ELFT>::relocateOne(uint8_t *Loc, uint8_t *BufEnd,
case R_MIPS_PCLO16:
writeMipsLo16<E>(Loc, S + readSignedLo16<E>(Loc) - P);
break;
case R_MIPS_TLS_DTPREL_HI16:
writeMipsHi16<E>(Loc, S - DTPOffset + readSignedLo16<E>(Loc));
break;
case R_MIPS_TLS_DTPREL_LO16:
writeMipsLo16<E>(Loc, S - DTPOffset + readSignedLo16<E>(Loc));
break;
case R_MIPS_TLS_TPREL_HI16:
writeMipsHi16<E>(Loc, S - TPOffset + readSignedLo16<E>(Loc));
break;
case R_MIPS_TLS_TPREL_LO16:
writeMipsLo16<E>(Loc, S - TPOffset + readSignedLo16<E>(Loc));
break;
default:
fatal("unrecognized reloc " + Twine(Type));
}
@ -1767,6 +1783,10 @@ bool MipsTargetInfo<ELFT>::isRelRelative(uint32_t Type) const {
case R_MIPS_64:
case R_MIPS_HI16:
case R_MIPS_LO16:
case R_MIPS_TLS_DTPREL_HI16:
case R_MIPS_TLS_DTPREL_LO16:
case R_MIPS_TLS_TPREL_HI16:
case R_MIPS_TLS_TPREL_LO16:
return false;
}
}

39
lld/test/ELF/mips-tls-hilo.s Normal file
View File

@ -0,0 +1,39 @@
# Check MIPS R_MIPS_TLS_DTPREL_HI16/LO16 and R_MIPS_TLS_TPREL_HI16/LO16
# relocations handling.
# RUN: llvm-mc -filetype=obj -triple=mips-unknown-linux %s -o %t.o
# RUN: ld.lld %t.o -o %t.exe
# RUN: llvm-objdump -d -t %t.exe | FileCheck -check-prefix=DIS %s
# RUN: llvm-readobj -r -mips-plt-got %t.exe | FileCheck %s
# REQUIRES: mips
# DIS: __start:
# DIS-NEXT: 20000: 24 62 00 00 addiu $2, $3, 0
# %hi(loc0 - .tdata - 0x8000) --^
# DIS-NEXT: 20004: 24 62 80 00 addiu $2, $3, -32768
# %lo(loc0 - .tdata - 0x8000) --^
# DIS-NEXT: 20008: 24 62 00 00 addiu $2, $3, 0
# %hi(loc0 - .tdata - 0x7000) --^
# DIS-NEXT: 2000c: 24 62 90 00 addiu $2, $3, -28672
# %lo(loc0 - .tdata - 0x7000) --^
# DIS: 00030000 l .tdata 00000000 .tdata
# DIS: 00030000 l .tdata 00000000 loc0
# CHECK: Relocations [
# CHECK-NEXT: ]
# CHECK-NOT: Primary GOT
.text
.globl __start
.type __start,@function
__start:
addiu $2, $3, %dtprel_hi(loc0) # R_MIPS_TLS_DTPREL_HI16
addiu $2, $3, %dtprel_lo(loc0) # R_MIPS_TLS_DTPREL_LO16
addiu $2, $3, %tprel_hi(loc0) # R_MIPS_TLS_TPREL_HI16
addiu $2, $3, %tprel_lo(loc0) # R_MIPS_TLS_TPREL_LO16
.section .tdata,"awT",%progbits
loc0:
.word 0