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Support R_X86_64_PC8 and R_X86_64_PC16.

Browse Source 
They are defined by the x86-64 ELF ABI standard.

Differential Revision: https://reviews.llvm.org/D57799

llvm-svn: 353314
This commit is contained in:
Rui Ueyama
2019-02-06 16:50:09 +00:00
parent 68bc5fb0ad
commit 33dbcbb2bc
2 changed files with 25 additions and 0 deletions
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4
lld/ELF/Arch/X86_64.cpp
View File

@@ -101,6 +101,8 @@ RelExpr X86_64<ELFT>::getRelExpr(RelType Type, const Symbol &S,
return R_SIZE;
case R_X86_64_PLT32:
return R_PLT_PC;
case R_X86_64_PC8:
case R_X86_64_PC16:
case R_X86_64_PC32:
case R_X86_64_PC64:
return R_PC;
@@ -319,10 +321,12 @@ template <class ELFT>
void X86_64<ELFT>::relocateOne(uint8_t *Loc, RelType Type, uint64_t Val) const {
switch (Type) {
case R_X86_64_8:
case R_X86_64_PC8:
checkUInt(Loc, Val, 8, Type);
*Loc = Val;
break;
case R_X86_64_16:
case R_X86_64_PC16:
checkUInt(Loc, Val, 16, Type);
write16le(Loc, Val);
break;

21
lld/test/ELF/x86-64-pcrel.s Normal file
View File

@@ -0,0 +1,21 @@
// REQUIRES: x86
// This is a test for R_X86_64_PC8 and R_X86_64_PC16.
// RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t1.o
// RUN: echo '.globl foo; foo:' | llvm-mc -filetype=obj -triple=x86_64-pc-linux - -o %t2.o
// RUN: ld.lld -o %t.exe %t1.o %t2.o
// RUN: llvm-objdump -s %t.exe | FileCheck %s
// CHECK: Contents of section .text:
// CHECK: 2000cccc cccccccc cccccccc cccccccc
// CHECK: 20cccccc cccccccc cccccccc cccccccc
.globl _start
_start:
.word foo - _start
.fill 14,1,0xcc
.byte foo - _start
.fill 15,1,0xcc