diff options
Diffstat (limited to 'lld/ELF/Target.cpp')
| -rw-r--r-- | lld/ELF/Target.cpp | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/lld/ELF/Target.cpp b/lld/ELF/Target.cpp index 073e613b3ad..529abacae5f 100644 --- a/lld/ELF/Target.cpp +++ b/lld/ELF/Target.cpp @@ -156,7 +156,10 @@ public: int32_t Index, unsigned RelOff) const override; bool usesOnlyLowPageBits(uint32_t Type) const override; void relocateOne(uint8_t *Loc, uint32_t Type, uint64_t Val) const override; + RelExpr adjustRelaxExpr(uint32_t Type, const uint8_t *Data, + RelExpr Expr) const override; void relaxTlsGdToLe(uint8_t *Loc, uint32_t Type, uint64_t Val) const override; + void relaxTlsGdToIe(uint8_t *Loc, uint32_t Type, uint64_t Val) const override; void relaxTlsIeToLe(uint8_t *Loc, uint32_t Type, uint64_t Val) const override; }; @@ -1141,6 +1144,16 @@ RelExpr AArch64TargetInfo::getRelExpr(uint32_t Type, } } +RelExpr AArch64TargetInfo::adjustRelaxExpr(uint32_t Type, const uint8_t *Data, + RelExpr Expr) const { + if (Expr == R_RELAX_TLS_GD_TO_IE) { + if (Type == R_AARCH64_TLSDESC_ADR_PAGE21) + return R_RELAX_TLS_GD_TO_IE_PAGE_PC; + return R_RELAX_TLS_GD_TO_IE_ABS; + } + return Expr; +} + bool AArch64TargetInfo::usesOnlyLowPageBits(uint32_t Type) const { switch (Type) { default: @@ -1320,6 +1333,7 @@ void AArch64TargetInfo::relaxTlsGdToLe(uint8_t *Loc, uint32_t Type, // ldr x1, [x0, #:tlsdesc_lo12:v [R_AARCH64_TLSDESC_LD64_LO12_NC] // add x0, x0, :tlsdesc_los:v [_AARCH64_TLSDESC_ADD_LO12_NC] // .tlsdesccall [R_AARCH64_TLSDESC_CALL] + // blr x1 // And it can optimized to: // movz x0, #0x0, lsl #16 // movk x0, #0x10 @@ -1348,6 +1362,38 @@ void AArch64TargetInfo::relaxTlsGdToLe(uint8_t *Loc, uint32_t Type, write32le(Loc, NewInst); } +void AArch64TargetInfo::relaxTlsGdToIe(uint8_t *Loc, uint32_t Type, + uint64_t Val) const { + // TLSDESC Global-Dynamic relocation are in the form: + // adrp x0, :tlsdesc:v [R_AARCH64_TLSDESC_ADR_PAGE21] + // ldr x1, [x0, #:tlsdesc_lo12:v [R_AARCH64_TLSDESC_LD64_LO12_NC] + // add x0, x0, :tlsdesc_los:v [_AARCH64_TLSDESC_ADD_LO12_NC] + // .tlsdesccall [R_AARCH64_TLSDESC_CALL] + // blr x1 + // And it can optimized to: + // adrp x0, :gottprel:v + // ldr x0, [x0, :gottprel_lo12:v] + // nop + // nop + + switch (Type) { + case R_AARCH64_TLSDESC_ADD_LO12_NC: + case R_AARCH64_TLSDESC_CALL: + write32le(Loc, 0xd503201f); // nop + break; + case R_AARCH64_TLSDESC_ADR_PAGE21: + write32le(Loc, 0x90000000); // adrp + relocateOne(Loc, R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21, Val); + break; + case R_AARCH64_TLSDESC_LD64_LO12_NC: + write32le(Loc, 0xf9400000); // ldr + relocateOne(Loc, R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC, Val); + break; + default: + llvm_unreachable("unsupported Relocation for TLS GD to LE relax"); + } +} + void AArch64TargetInfo::relaxTlsIeToLe(uint8_t *Loc, uint32_t Type, uint64_t Val) const { checkUInt<32>(Val, Type); |
