[PATCH] D134715: [LoongArch] Produce a R_LARCH_32_PCREL relocation

[Ray Wang via Phabricator via llvm-commits]

wangleiat created this revision.
wangleiat added reviewers: SixWeining, xen0n, xry111, gonglingqin, MaskRay.
Herald added subscribers: StephenFan, hiraditya.
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LoongArchELFObjectWriter::getRelocType check IsPCRel for FK_Data_4
(which we produce a R_LARCH_32_PCREL relocation for if IsPCRel).

R_LARCH_32_PCREL is required for FDE relocation.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D134715

Files:
  llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchELFObjectWriter.cpp
  llvm/test/MC/LoongArch/Relocations/fde-reloc.s


Index: llvm/test/MC/LoongArch/Relocations/fde-reloc.s
===================================================================
--- /dev/null
+++ llvm/test/MC/LoongArch/Relocations/fde-reloc.s
@@ -0,0 +1,14 @@
+# RUN: llvm-mc --filetype=obj --triple=loongarch64 < %s \
+# RUN:     | llvm-readobj -r - | FileCheck %s
+
+## Ensure that the eh_frame records the symbolic difference with
+## the R_LARCH_32_PCREL relocation.
+
+func:
+ .cfi_startproc
+  ret
+ .cfi_endproc
+
+# CHECK:   Section (4) .rela.eh_frame {
+# CHECK-NEXT:   0x1C R_LARCH_32_PCREL - 0x0
+# CHECK-NEXT: }
Index: llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchELFObjectWriter.cpp
===================================================================
--- llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchELFObjectWriter.cpp
+++ llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchELFObjectWriter.cpp
@@ -64,7 +64,7 @@
     Ctx.reportError(Fixup.getLoc(), "2-byte data relocations not supported");
     return ELF::R_LARCH_NONE;
   case FK_Data_4:
-    return ELF::R_LARCH_32;
+    return IsPCRel ? ELF::R_LARCH_32_PCREL : ELF::R_LARCH_32;
   case FK_Data_8:
     return ELF::R_LARCH_64;
   case LoongArch::fixup_loongarch_b16:


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