[PATCH] D17937: ARM: Support relative references using the PREL31 symbol variant.

[Peter Collingbourne via llvm-commits]

pcc created this revision.
pcc added a reviewer: rafael.
pcc added a subscriber: llvm-commits.
Herald added subscribers: rengolin, aemerson.

http://reviews.llvm.org/D17937

Files:
  lib/Target/ARM/MCTargetDesc/ARMELFObjectWriter.cpp
  test/MC/ARM/symbol-variants.s

Index: test/MC/ARM/symbol-variants.s
===================================================================
--- test/MC/ARM/symbol-variants.s
+++ test/MC/ARM/symbol-variants.s
@@ -84,8 +84,14 @@
 @ CHECK: 60 R_ARM_TLS_GOTDESC f24
 @ CHECK: 64 R_ARM_TLS_GOTDESC f25
 
+@ prel31 (relative)
+.word f26(PREL31)-.
+.word f27(prel31)-.
+ at CHECK: 68 R_ARM_PREL31 f26
+ at CHECK: 6c R_ARM_PREL31 f27
+
 @ got_prel
-.word	f26(GOT_PREL) + (. - .Lsym)
-	ldr r3, =f27(GOT_PREL)
-@ CHECK: 68 R_ARM_GOT_PREL f26
-@ CHECK: 70 R_ARM_GOT_PREL f27
+.word	f28(GOT_PREL) + (. - .Lsym)
+	ldr r3, =f29(GOT_PREL)
+@ CHECK: 70 R_ARM_GOT_PREL f28
+@ CHECK: 78 R_ARM_GOT_PREL f29
Index: lib/Target/ARM/MCTargetDesc/ARMELFObjectWriter.cpp
===================================================================
--- lib/Target/ARM/MCTargetDesc/ARMELFObjectWriter.cpp
+++ lib/Target/ARM/MCTargetDesc/ARMELFObjectWriter.cpp
@@ -98,6 +98,9 @@
       case MCSymbolRefExpr::VK_ARM_GOT_PREL:
         Type = ELF::R_ARM_GOT_PREL;
         break;
+      case MCSymbolRefExpr::VK_ARM_PREL31:
+        Type = ELF::R_ARM_PREL31;
+        break;
       }
       break;
     case ARM::fixup_arm_blx:


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