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[LLD][PowerPC] Add support for R_PPC64_GOT_PCREL34

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Add support for the 34bit relocation R_PPC64_GOT_PCREL34 for
PC Relative in LLD.

Reviewers: sfertile, MaskRay

Differential Revision: https://reviews.llvm.org/D81948
This commit is contained in:
Stefan Pintilie 2020-06-24 07:40:35 -05:00 committed by Kamau Bridgeman
parent 4e62c6359c
commit 8131ef5d63
2 changed files with 64 additions and 0 deletions
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13
lld/ELF/Arch/PPC64.cpp
View File

@ -671,6 +671,8 @@ RelExpr PPC64::getRelExpr(RelType type, const Symbol &s,
case R_PPC64_TOC16_HI:
case R_PPC64_TOC16_LO:
return R_GOTREL;
case R_PPC64_GOT_PCREL34:
return R_GOT_PC;
case R_PPC64_TOC16_HA:
case R_PPC64_TOC16_LO_DS:
return config->tocOptimize ? R_PPC64_RELAX_TOC : R_GOTREL;
@ -1012,6 +1014,17 @@ void PPC64::relocate(uint8_t *loc, const Relocation &rel, uint64_t val) const {
(val & si1Mask));
break;
}
case R_PPC64_GOT_PCREL34: {
const uint64_t si0Mask = 0x00000003ffff0000;
const uint64_t si1Mask = 0x000000000000ffff;
const uint64_t fullMask = 0x0003ffff0000ffff;
checkInt(loc, val, 34, rel);
uint64_t instr = readPrefixedInstruction(loc) & ~fullMask;
writePrefixedInstruction(loc, instr | ((val & si0Mask) << 16) |
(val & si1Mask));
break;
}
default:
llvm_unreachable("unknown relocation");
}

51
lld/test/ELF/ppc64-reloc-got-pcrel34.s Normal file
View File

@ -0,0 +1,51 @@
# REQUIRES: ppc
# RUN: echo 'SECTIONS { \
# RUN: .text_low 0x10010000: { *(.text_low) } \
# RUN: .text_high 0x10080000 : { *(.text_high) } \
# RUN: }' > %t.script
# RUN: llvm-mc -filetype=obj -triple=powerpc64le %s -o %t.o
# RUN: ld.lld -T %t.script --shared %t.o -o %t
# RUN: llvm-readelf -s %t | FileCheck %s --check-prefix=SYMBOL
# RUN: llvm-readelf -r %t | FileCheck %s --check-prefix=RELA
# RUN: llvm-objdump -d --no-show-raw-insn --mcpu=future %t | FileCheck %s
# RUN: llvm-mc -filetype=obj -triple=powerpc64 %s -o %t.o
# RUN: ld.lld -T %t.script --shared %t.o -o %t
# RUN: llvm-readelf -s %t | FileCheck %s --check-prefix=SYMBOL
# RUN: llvm-readelf -r %t | FileCheck %s --check-prefix=RELA
# RUN: llvm-objdump -d --no-show-raw-insn --mcpu=future %t | FileCheck %s
.text
.section .text_low, "ax", %progbits
# CHECK-LABEL: <GlobIntPCRel>:
# CHECK-NEXT: pld 3, 458928(0), 1
# CHECK-NEXT: lwa 3, 0(3)
# SYMBOL: Symbol table '.dynsym' contains 4 entries:
# SYMBOL: 00000000 0 NOTYPE GLOBAL DEFAULT UND glob_int
# RELA: 100800b0 0000000100000014 R_PPC64_GLOB_DAT 0000000000000000 glob_int + 0
GlobIntPCRel:
pld 3, glob_int@got@PCREL(0), 1
lwa 3, 0(3)
blr
# CHECK-LABEL: <GlobIntPCRelOffset>:
# CHECK-NEXT: pld 3, 458920(0), 1
# CHECK-NEXT: lwa 3, 8(3)
# SYMBOL: 00000000 0 NOTYPE GLOBAL DEFAULT UND glob_int8
# RELA: 100800b8 0000000200000014 R_PPC64_GLOB_DAT 0000000000000000 glob_int8 + 0
GlobIntPCRelOffset:
pld 3, glob_int8@got@PCREL(0), 1
lwa 3, 8(3)
blr
# CHECK-LABEL: <GlobIntPCRelBigOffset>:
# CHECK-NEXT: pld 3, 192(0), 1
# CHECK-NEXT: lwa 3, 64(3)
# SYMBOL: 00000000 0 NOTYPE GLOBAL DEFAULT UND glob_int8_big
# RELA: 100800c0 0000000300000014 R_PPC64_GLOB_DAT 0000000000000000 glob_int8_big + 0
.section .text_high, "ax", %progbits
GlobIntPCRelBigOffset:
pld 3, glob_int8_big@got@PCREL(0), 1
lwa 3, 64(3)
blr