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Document some constants. NFC. 

llvm-svn: 270274
This commit is contained in:
Rafael Espindola 2016-05-20 21:09:59 +00:00
parent e88113414b
commit 91e9fc0931
1 changed files with 6 additions and 0 deletions
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6
lld/ELF/Target.cpp
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@ -601,6 +601,8 @@ void X86_64TargetInfo::relaxTlsGdToLe(uint8_t *Loc, uint32_t Type,
0x48, 0x8d, 0x80, 0x00, 0x00, 0x00, 0x00 // lea x@tpoff,%rax
};
memcpy(Loc - 4, Inst, sizeof(Inst));
// The original code used a pc relative relocation and so we have to
// compensate for the -4 in had in the addend.
relocateOne(Loc + 8, R_X86_64_TPOFF32, Val + 4);
}
@ -620,6 +622,8 @@ void X86_64TargetInfo::relaxTlsGdToIe(uint8_t *Loc, uint32_t Type,
0x48, 0x03, 0x05, 0x00, 0x00, 0x00, 0x00 // addq x@tpoff,%rax
};
memcpy(Loc - 4, Inst, sizeof(Inst));
// Both code sequences are PC relatives, but since we are moving the constant
// forward by 8 bytes we have to subtract the value by 8.
relocateOne(Loc + 8, R_X86_64_PC32, Val - 8);
}
@ -653,6 +657,8 @@ void X86_64TargetInfo::relaxTlsIeToLe(uint8_t *Loc, uint32_t Type,
if (*Prefix == 0x4c)
*Prefix = (IsMov || RspAdd) ? 0x49 : 0x4d;
*RegSlot = (IsMov || RspAdd) ? (0xc0 | Reg) : (0x80 | Reg | (Reg << 3));
// The original code used a pc relative relocation and so we have to
// compensate for the -4 in had in the addend.
relocateOne(Loc, R_X86_64_TPOFF32, Val + 4);
}