diff options
Diffstat (limited to 'lld/ELF/Arch/PPC64.cpp')
| -rw-r--r-- | lld/ELF/Arch/PPC64.cpp | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/lld/ELF/Arch/PPC64.cpp b/lld/ELF/Arch/PPC64.cpp index 73317584aca..fa3bf6c62a0 100644 --- a/lld/ELF/Arch/PPC64.cpp +++ b/lld/ELF/Arch/PPC64.cpp @@ -55,6 +55,7 @@ public: RelExpr Expr) const override; void relaxTlsGdToIe(uint8_t *Loc, RelType Type, uint64_t Val) const override; void relaxTlsGdToLe(uint8_t *Loc, RelType Type, uint64_t Val) const override; + void relaxTlsLdToLe(uint8_t *Loc, RelType Type, uint64_t Val) const override; }; } // namespace @@ -165,6 +166,52 @@ void PPC64::relaxTlsGdToLe(uint8_t *Loc, RelType Type, uint64_t Val) const { } } + +void PPC64::relaxTlsLdToLe(uint8_t *Loc, RelType Type, uint64_t Val) const { + // Reference: 3.7.4.3 of the 64-bit ELF V2 abi supplement. + // The local dynamic code sequence for a global `x` will look like: + // Instruction Relocation Symbol + // addis r3, r2, x@got@tlsld@ha R_PPC64_GOT_TLSLD16_HA x + // addi r3, r3, x@got@tlsld@l R_PPC64_GOT_TLSLD16_LO x + // bl __tls_get_addr(x@tlsgd) R_PPC64_TLSLD x + // R_PPC64_REL24 __tls_get_addr + // nop None None + + // Relaxing to local exec entails converting: + // addis r3, r2, x@got@tlsld@ha into nop + // addi r3, r3, x@got@tlsld@l into addis r3, r13, 0 + // bl __tls_get_addr(x@tlsgd) into nop + // nop into addi r3, r3, 4096 + + uint32_t EndianOffset = Config->EKind == ELF64BEKind ? 2U : 0U; + switch (Type) { + case R_PPC64_GOT_TLSLD16_HA: + write32(Loc - EndianOffset, 0x60000000); // nop + break; + case R_PPC64_GOT_TLSLD16_LO: + write32(Loc - EndianOffset, 0x3c6d0000); // addis r3, r13, 0 + break; + case R_PPC64_TLSLD: + write32(Loc, 0x60000000); // nop + write32(Loc + 4, 0x38631000); // addi r3, r3, 4096 + break; + case R_PPC64_DTPREL16: + case R_PPC64_DTPREL16_HA: + case R_PPC64_DTPREL16_HI: + case R_PPC64_DTPREL16_DS: + case R_PPC64_DTPREL16_LO: + case R_PPC64_DTPREL16_LO_DS: + case R_PPC64_GOT_DTPREL16_HA: + case R_PPC64_GOT_DTPREL16_LO_DS: + case R_PPC64_GOT_DTPREL16_DS: + case R_PPC64_GOT_DTPREL16_HI: + relocateOne(Loc, Type, Val); + break; + default: + llvm_unreachable("unsupported relocation for TLS LD to LE relaxation"); + } +} + RelExpr PPC64::getRelExpr(RelType Type, const Symbol &S, const uint8_t *Loc) const { switch (Type) { @@ -230,6 +277,7 @@ RelExpr PPC64::getRelExpr(RelType Type, const Symbol &S, case R_PPC64_TLSGD: return R_TLSDESC_CALL; case R_PPC64_TLSLD: + return R_TLSLD_HINT; case R_PPC64_TLS: return R_HINT; default: @@ -431,6 +479,8 @@ RelExpr PPC64::adjustRelaxExpr(RelType Type, const uint8_t *Data, RelExpr Expr) const { if (Expr == R_RELAX_TLS_GD_TO_IE) return R_RELAX_TLS_GD_TO_IE_GOT_OFF; + if (Expr == R_RELAX_TLS_LD_TO_LE) + return R_RELAX_TLS_LD_TO_LE_ABS; return Expr; } |
