[llvm-branch-commits] [ARM, MC] Support FDPIC relocations (PR #82187)
Fangrui Song via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Tue Feb 20 10:33:45 PST 2024
================
@@ -11358,6 +11361,37 @@ bool ARMAsmParser::parseDirectiveARM(SMLoc L) {
return false;
}
+MCSymbolRefExpr::VariantKind
+ARMAsmParser::getVariantKindForName(StringRef Name) const {
+ return StringSwitch<MCSymbolRefExpr::VariantKind>(Name.lower())
+ .Case("funcdesc", MCSymbolRefExpr::VK_FUNCDESC)
+ .Case("got", MCSymbolRefExpr::VK_GOT)
+ .Case("got_prel", MCSymbolRefExpr::VK_ARM_GOT_PREL)
+ .Case("gotfuncdesc", MCSymbolRefExpr::VK_GOTFUNCDESC)
+ .Case("gotoff", MCSymbolRefExpr::VK_GOTOFF)
+ .Case("gotofffuncdesc", MCSymbolRefExpr::VK_GOTOFFFUNCDESC)
+ .Case("gottpoff", MCSymbolRefExpr::VK_GOTTPOFF)
+ .Case("gottpoff_fdpic", MCSymbolRefExpr::VK_GOTTPOFF_FDPIC)
+ .Case("imgrel", MCSymbolRefExpr::VK_COFF_IMGREL32)
+ .Case("none", MCSymbolRefExpr::VK_ARM_NONE)
+ .Case("plt", MCSymbolRefExpr::VK_PLT)
+ .Case("prel31", MCSymbolRefExpr::VK_ARM_PREL31)
+ .Case("sbrel", MCSymbolRefExpr::VK_ARM_SBREL)
+ .Case("secrel32", MCSymbolRefExpr::VK_SECREL)
+ .Case("target1", MCSymbolRefExpr::VK_ARM_TARGET1)
+ .Case("target2", MCSymbolRefExpr::VK_ARM_TARGET2)
+ .Case("tlscall", MCSymbolRefExpr::VK_TLSCALL)
+ .Case("tlsdesc", MCSymbolRefExpr::VK_TLSDESC)
+ .Case("tlsgd", MCSymbolRefExpr::VK_TLSGD)
+ .Case("tlsgd_fdpic", MCSymbolRefExpr::VK_TLSGD_FDPIC)
+ .Case("tlsld", MCSymbolRefExpr::VK_TLSLD)
+ .Case("tlsldm", MCSymbolRefExpr::VK_TLSLDM)
+ .Case("tlsldm_fdpic", MCSymbolRefExpr::VK_TLSLDM_FDPIC)
+ .Case("tlsldo", MCSymbolRefExpr::VK_ARM_TLSLDO)
+ .Case("tpoff", MCSymbolRefExpr::VK_TPOFF)
+ .Default(MCSymbolRefExpr::VK_Invalid);
----------------
MaskRay wrote:
Yes, the binutils contains `tlsdescseq`, but there is no `(tlsdescseq)` occurrence. GCC doesn't emit `(tlsdescseq)`, either.
I suspect that the entry in binutils is not used.
There is a directive named `.tlsdescseq` (https://www.fsfla.org/~lxoliva/writeups/TLS/RFC-TLSDESC-ARM.txt), which is for TLS optimization. But GCC doesn't emit this directive.
Clang doesn't support `-mtls-dialect=gnu2` for ARM.
https://github.com/llvm/llvm-project/pull/82187
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