[ELF][MIPS] Support R_MIPS_TLS_DTPREL_HI16/LO16 and R_MIPS_TLS_TPREL_HI16/LO16 relocations
That is initial and the most trivial patch to support TLS for MIPS targets.
llvm-svn: 263712
diff --git a/lld/ELF/Target.cpp b/lld/ELF/Target.cpp
index e76e0a9..fda8975 100644
--- a/lld/ELF/Target.cpp
+++ b/lld/ELF/Target.cpp
@@ -1677,6 +1677,10 @@
uint32_t Type, uint64_t P, uint64_t S,
uint64_t ZA, uint8_t *PairedLoc) const {
const endianness E = ELFT::TargetEndianness;
+ // Thread pointer and DRP offsets from the start of TLS data area.
+ // https://www.linux-mips.org/wiki/NPTL
+ const uint32_t TPOffset = 0x7000;
+ const uint32_t DTPOffset = 0x8000;
switch (Type) {
case R_MIPS_32:
add32<E>(Loc, S);
@@ -1747,6 +1751,18 @@
case R_MIPS_PCLO16:
writeMipsLo16<E>(Loc, S + readSignedLo16<E>(Loc) - P);
break;
+ case R_MIPS_TLS_DTPREL_HI16:
+ writeMipsHi16<E>(Loc, S - DTPOffset + readSignedLo16<E>(Loc));
+ break;
+ case R_MIPS_TLS_DTPREL_LO16:
+ writeMipsLo16<E>(Loc, S - DTPOffset + readSignedLo16<E>(Loc));
+ break;
+ case R_MIPS_TLS_TPREL_HI16:
+ writeMipsHi16<E>(Loc, S - TPOffset + readSignedLo16<E>(Loc));
+ break;
+ case R_MIPS_TLS_TPREL_LO16:
+ writeMipsLo16<E>(Loc, S - TPOffset + readSignedLo16<E>(Loc));
+ break;
default:
fatal("unrecognized reloc " + Twine(Type));
}
@@ -1767,6 +1783,10 @@
case R_MIPS_64:
case R_MIPS_HI16:
case R_MIPS_LO16:
+ case R_MIPS_TLS_DTPREL_HI16:
+ case R_MIPS_TLS_DTPREL_LO16:
+ case R_MIPS_TLS_TPREL_HI16:
+ case R_MIPS_TLS_TPREL_LO16:
return false;
}
}