[PATCH] D16166: [ELF/AArch64] Support R_AARCH64_LDST128_ABS_LO12_NC relocation

[Davide Italiano via llvm-commits]

davide created this revision.
davide added reviewers: ruiu, rafael, grimar.
davide added a subscriber: llvm-commits.
Herald added subscribers: emaste, rengolin, aemerson.

This is needed to self-host lld on FreeBSD. I've been sitting with this (and other relocation patches) in my local tree for a while.

http://reviews.llvm.org/D16166

Files:
  ELF/Target.cpp
  test/ELF/aarch64-relocs.s

Index: test/ELF/aarch64-relocs.s
===================================================================
--- test/ELF/aarch64-relocs.s
+++ test/ELF/aarch64-relocs.s
@@ -120,3 +120,19 @@
 # CHECK: Disassembly of section .R_AARCH64_LDST8_ABS_LO12_NC:
 # CHECK-NEXT: ldst8:
 # CHECK-NEXT:   11044:       ab 21 81 39     ldrsb x11, [x13, #72]
+
+.section .R_AARCH64_LDST128_ABS_LO12_NC,"ax", at progbits
+ldst128:
+  ldr q20, [x19, #:lo12:foo128]
+foo128:
+  .asciz "foo"
+  .size mystr, 3
+
+# S = 0x1104c, A = 0x4
+# R = ((S + A) & 0xFF8) << 6 = 0x00001400
+# 0x00001400 | 0x3dc00274 = 0x3dc01674
+# CHECK: Disassembly of section .R_AARCH64_LDST128_ABS_LO12_NC:
+# CHECK: ldst128:
+# CHECK:   1104c:       74 16 c0 3d     ldr     q20, [x19, #80]
+#foo128:
+#   11050:       66 6f 6f 00     .word
Index: ELF/Target.cpp
===================================================================
--- ELF/Target.cpp
+++ ELF/Target.cpp
@@ -1269,6 +1269,7 @@
   case R_AARCH64_LDST8_ABS_LO12_NC:
   case R_AARCH64_LDST32_ABS_LO12_NC:
   case R_AARCH64_LDST64_ABS_LO12_NC:
+  case R_AARCH64_LDST128_ABS_LO12_NC:
     if (auto *SS = dyn_cast<SharedSymbol<ELF64LE>>(&S))
       return SS->Sym.getType() == STT_OBJECT;
     return false;
@@ -1376,6 +1377,9 @@
     checkAlignment<8>(SA, Type);
     or32le(Loc, (SA & 0xFF8) << 7);
     break;
+  case R_AARCH64_LDST128_ABS_LO12_NC:
+    or32le(Loc, (SA & 0x0FF8) << 6);
+    break;
   case R_AARCH64_LDST8_ABS_LO12_NC:
     or32le(Loc, (SA & 0xFFF) << 10);
     break;


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