[PATCH] D28115: RuntimeDyldELF: add support for R_AARCH64_ADD_ABS_LO12_NC

[Eugene Leviant via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL290598: RuntimeDyldELF: add R_AARCH64_ADD_ABS_LO12_NC reloc (authored by evgeny777).

Changed prior to commit:
  https://reviews.llvm.org/D28115?vs=82510&id=82531#toc

Repository:
  rL LLVM

https://reviews.llvm.org/D28115

Files:
  llvm/trunk/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
  llvm/trunk/test/ExecutionEngine/RuntimeDyld/AArch64/ELF_ARM64_relocations.s


Index: llvm/trunk/test/ExecutionEngine/RuntimeDyld/AArch64/ELF_ARM64_relocations.s
===================================================================
--- llvm/trunk/test/ExecutionEngine/RuntimeDyld/AArch64/ELF_ARM64_relocations.s
+++ llvm/trunk/test/ExecutionEngine/RuntimeDyld/AArch64/ELF_ARM64_relocations.s
@@ -14,6 +14,9 @@
         movk    x0, #:abs_g1_nc:f
 # R_AARCH64_MOVW_UABS_G0_NC
         movk    x0, #:abs_g0_nc:f
+a:
+# R_AARCH64_ADD_ABS_LO12_NC
+        add x0, x0, :lo12:f
         ret
         .Lfunc_end0:
         .size   g, .Lfunc_end0-g
@@ -31,3 +34,7 @@
 # rtdyld-check: *{4}(g + 8) = 0xf2b13560
 # rtdyld-check: *{4}(g + 12) = 0xf299bde0
 # rtdyld-check: *{8}k = f
+
+## f & 0xFFF = 0xdef (bits 11:0 of f)
+## 0xdef << 10 = 0x37bc00
+# rtdyld-check: *{4}(a) = 0x9137bc00
Index: llvm/trunk/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
===================================================================
--- llvm/trunk/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
+++ llvm/trunk/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
@@ -453,6 +453,15 @@
     support::ulittle32_t::ref{TargetPtr} = TargetValue;
     break;
   }
+  case ELF::R_AARCH64_ADD_ABS_LO12_NC: {
+    // Operation: S + A
+    uint64_t Result = Value + Addend;
+
+    // Immediate goes in bits 21:10 of LD/ST instruction, taken
+    // from bits 11:0 of X
+    *TargetPtr |= ((Result & 0xfff) << 10);
+    break;
+  }
   case ELF::R_AARCH64_LDST32_ABS_LO12_NC: {
     // Operation: S + A
     uint64_t Result = Value + Addend;


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