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lld/trunk/ELF/Arch/X86_64.cpp
| Show First 20 Lines • Show All 258 Lines • ▼ Show 20 Lines | void X86_64<ELFT>::relaxTlsIeToLe(uint8_t *Loc, RelType Type, | ||||
| // The original code used a PC relative relocation. | // The original code used a PC relative relocation. | ||||
| // Need to compensate for the -4 it had in the addend. | // Need to compensate for the -4 it had in the addend. | ||||
| write32le(Loc, Val + 4); | write32le(Loc, Val + 4); | ||||
| } | } | ||||
| template <class ELFT> | template <class ELFT> | ||||
| void X86_64<ELFT>::relaxTlsLdToLe(uint8_t *Loc, RelType Type, | void X86_64<ELFT>::relaxTlsLdToLe(uint8_t *Loc, RelType Type, | ||||
| uint64_t Val) const { | uint64_t Val) const { | ||||
| // Convert | |||||
| // leaq bar@tlsld(%rip), %rdi | |||||
| // callq __tls_get_addr@PLT | |||||
| // leaq bar@dtpoff(%rax), %rcx | |||||
| // to | |||||
| // .word 0x6666 | |||||
| // .byte 0x66 | |||||
| // mov %fs:0,%rax | |||||
| // leaq bar@tpoff(%rax), %rcx | |||||
| if (Type == R_X86_64_DTPOFF64) { | if (Type == R_X86_64_DTPOFF64) { | ||||
| write64le(Loc, Val); | write64le(Loc, Val); | ||||
| return; | return; | ||||
| } | } | ||||
| if (Type == R_X86_64_DTPOFF32) { | if (Type == R_X86_64_DTPOFF32) { | ||||
| write32le(Loc, Val); | write32le(Loc, Val); | ||||
| return; | return; | ||||
| } | } | ||||
| const uint8_t Inst[] = { | const uint8_t Inst[] = { | ||||
| 0x66, 0x66, // .word 0x6666 | 0x66, 0x66, // .word 0x6666 | ||||
| 0x66, // .byte 0x66 | 0x66, // .byte 0x66 | ||||
| 0x64, 0x48, 0x8b, 0x04, 0x25, 0x00, 0x00, 0x00, 0x00, // mov %fs:0,%rax | 0x64, 0x48, 0x8b, 0x04, 0x25, 0x00, 0x00, 0x00, 0x00, // mov %fs:0,%rax | ||||
| }; | }; | ||||
| if (Loc[4] == 0xe8) { | |||||
| // Convert | |||||
| // leaq bar@tlsld(%rip), %rdi # 48 8d 3d <Loc> | |||||
| // callq __tls_get_addr@PLT # e8 <disp32> | |||||
| // leaq bar@dtpoff(%rax), %rcx | |||||
| // to | |||||
| // .word 0x6666 | |||||
| // .byte 0x66 | |||||
| // mov %fs:0,%rax | |||||
| // leaq bar@tpoff(%rax), %rcx | |||||
| memcpy(Loc - 3, Inst, sizeof(Inst)); | memcpy(Loc - 3, Inst, sizeof(Inst)); | ||||
| return; | |||||
| } | |||||
| if (Loc[4] == 0xff && Loc[5] == 0x15) { | |||||
| // Convert | |||||
| // leaq x@tlsld(%rip),%rdi # 48 8d 3d <Loc> | |||||
| // call *__tls_get_addr@GOTPCREL(%rip) # ff 15 <disp32> | |||||
| // to | |||||
| // .long 0x66666666 | |||||
| // movq %fs:0,%rax | |||||
| // See "Table 11.9: LD -> LE Code Transition (LP64)" in | |||||
| // https://raw.githubusercontent.com/wiki/hjl-tools/x86-psABI/x86-64-psABI-1.0.pdf | |||||
| Loc[-3] = 0x66; | |||||
| memcpy(Loc - 2, Inst, sizeof(Inst)); | |||||
| return; | |||||
| } | |||||
| error(getErrorLocation(Loc - 3) + | |||||
| "expected R_X86_64_PLT32 or R_X86_64_GOTPCRELX after R_X86_64_TLSLD"); | |||||
| } | } | ||||
| template <class ELFT> | template <class ELFT> | ||||
| void X86_64<ELFT>::relocateOne(uint8_t *Loc, RelType Type, uint64_t Val) const { | void X86_64<ELFT>::relocateOne(uint8_t *Loc, RelType Type, uint64_t Val) const { | ||||
| switch (Type) { | switch (Type) { | ||||
| case R_X86_64_8: | case R_X86_64_8: | ||||
| checkUInt(Loc, Val, 8, Type); | checkUInt(Loc, Val, 8, Type); | ||||
| *Loc = Val; | *Loc = Val; | ||||
| ▲ Show 20 Lines • Show All 358 Lines • Show Last 20 Lines | |||||