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Represent TOC relative relocations as GOTREL. 

That way we only need to subtract the offset is relocateOne.

llvm-svn: 267702
This commit is contained in:
Rafael Espindola 2016-04-27 12:25:22 +00:00
parent 520ed3a621
commit 15cec298e6
1 changed files with 19 additions and 10 deletions
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29
lld/ELF/Target.cpp
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@ -822,6 +822,8 @@ PPC64TargetInfo::PPC64TargetInfo() {
VAStart = 0x10000000;
}
static uint64_t PPC64TocOffset = 0x8000;
uint64_t getPPC64TocBase() {
// The TOC consists of sections .got, .toc, .tocbss, .plt in that order. The
// TOC starts where the first of these sections starts. We always create a
@ -833,13 +835,20 @@ uint64_t getPPC64TocBase() {
// thus permitting a full 64 Kbytes segment. Note that the glibc startup
// code (crt1.o) assumes that you can get from the TOC base to the
// start of the .toc section with only a single (signed) 16-bit relocation.
return TocVA + 0x8000;
return TocVA + PPC64TocOffset;
}
RelExpr PPC64TargetInfo::getRelExpr(uint32_t Type, const SymbolBody &S) const {
switch (Type) {
default:
return R_ABS;
case R_PPC64_TOC16:
case R_PPC64_TOC16_DS:
case R_PPC64_TOC16_HA:
case R_PPC64_TOC16_HI:
case R_PPC64_TOC16_LO:
case R_PPC64_TOC16_LO_DS:
return R_GOTREL;
case R_PPC64_TOC:
return R_PPC_TOC;
case R_PPC64_REL24:
@ -880,17 +889,17 @@ bool PPC64TargetInfo::isRelRelative(uint32_t Type) const {
void PPC64TargetInfo::relocateOne(uint8_t *Loc, uint32_t Type,
uint64_t Val) const {
uint64_t TB = getPPC64TocBase();
uint64_t TO = PPC64TocOffset;
// For a TOC-relative relocation, adjust the addend and proceed in terms of
// the corresponding ADDR16 relocation type.
// For a TOC-relative relocation, proceed in terms of the corresponding
// ADDR16 relocation type.
switch (Type) {
case R_PPC64_TOC16: Type = R_PPC64_ADDR16; Val -= TB; break;
case R_PPC64_TOC16_DS: Type = R_PPC64_ADDR16_DS; Val -= TB; break;
case R_PPC64_TOC16_HA: Type = R_PPC64_ADDR16_HA; Val -= TB; break;
case R_PPC64_TOC16_HI: Type = R_PPC64_ADDR16_HI; Val -= TB; break;
case R_PPC64_TOC16_LO: Type = R_PPC64_ADDR16_LO; Val -= TB; break;
case R_PPC64_TOC16_LO_DS: Type = R_PPC64_ADDR16_LO_DS; Val -= TB; break;
case R_PPC64_TOC16: Type = R_PPC64_ADDR16; Val -= TO; break;
case R_PPC64_TOC16_DS: Type = R_PPC64_ADDR16_DS; Val -= TO; break;
case R_PPC64_TOC16_HA: Type = R_PPC64_ADDR16_HA; Val -= TO; break;
case R_PPC64_TOC16_HI: Type = R_PPC64_ADDR16_HI; Val -= TO; break;
case R_PPC64_TOC16_LO: Type = R_PPC64_ADDR16_LO; Val -= TO; break;
case R_PPC64_TOC16_LO_DS: Type = R_PPC64_ADDR16_LO_DS; Val -= TO; break;
default: break;
}