[PATCH] D24403: [ELF/AArch64] Support some of R_AARCH64_MOVW_UABS_* relocations

[Eugene Leviant via llvm-commits]

evgeny777 created this revision.
evgeny777 added reviewers: ruiu, rafael.
evgeny777 added subscribers: grimar, ikudrin, llvm-commits.
evgeny777 set the repository for this revision to rL LLVM.
evgeny777 added a project: lld.
Herald added subscribers: rengolin, aemerson.

This patch adds following relocs

R_AARCH64_MOVW_UABS_G3
R_AARCH64_MOVW_UABS_G2_NC
R_AARCH64_MOVW_UABS_G1_NC
R_AARCH64_MOVW_UABS_G0_NC



Repository:
  rL LLVM

https://reviews.llvm.org/D24403

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

Index: test/ELF/aarch64-relocs.s
===================================================================
--- test/ELF/aarch64-relocs.s
+++ test/ELF/aarch64-relocs.s
@@ -1,5 +1,6 @@
 # RUN: llvm-mc -filetype=obj -triple=aarch64-unknown-freebsd %s -o %t
-# RUN: ld.lld %t -o %t2
+# RUN: llvm-mc -filetype=obj -triple=aarch64-unknown-freebsd %p/Inputs/uabs_label.s -o %t2.o
+# RUN: ld.lld %t %t2.o -o %t2
 # RUN: llvm-objdump -d %t2 | FileCheck %s
 # REQUIRES: aarch64
 
@@ -150,3 +151,20 @@
 # CHECK: Disassembly of section .R_AARCH64_LDST16_ABS_LO12_NC:
 # CHECK-NEXT: ldst16:
 # CHECK-NEXT:   11054:       71 b2 40 7d     ldr     h17, [x19, #88]
+
+.section .R_AARCH64_MOVW_UABS,"ax", at progbits
+movz1:
+   movk x12, #:abs_g0_nc:uabs_label
+   movk x13, #:abs_g1_nc:uabs_label
+   movk x14, #:abs_g2_nc:uabs_label
+   movz x15, #:abs_g3:uabs_label
+   movk x16, #:abs_g3:uabs_label
+
+## 4222124650659840 == (0xF << 48)
+# CHECK: Disassembly of section .R_AARCH64_MOVW_UABS:
+# CHECK-NEXT: movz1:
+# CHECK-NEXT: 8c 01 80 f2   movk  x12, #12
+# CHECK-NEXT: ad 01 a0 f2   movk  x13, #13, lsl #16
+# CHECK-NEXT: ce 01 c0 f2   movk  x14, #14, lsl #32
+# CHECK-NEXT: ef 01 e0 d2   mov x15, #4222124650659840
+# CHECK-NEXT: f0 01 e0 f2   movk  x16, #15, lsl #48
Index: test/ELF/Inputs/uabs_label.s
===================================================================
--- test/ELF/Inputs/uabs_label.s
+++ test/ELF/Inputs/uabs_label.s
@@ -0,0 +1,4 @@
+# Sample label to test R_AARCH64_MOVW_UABS relocations
+
+.globl uabs_label
+uabs_label = 0xF000E000D000C
Index: ELF/Target.cpp
===================================================================
--- ELF/Target.cpp
+++ ELF/Target.cpp
@@ -1369,6 +1369,18 @@
   case R_AARCH64_TLSDESC_ADD_LO12_NC:
     updateAArch64Add(Loc, Val);
     break;
+  case R_AARCH64_MOVW_UABS_G0_NC:
+    or32le(Loc, (Val & 0xFFFF) << 5);
+    break;
+  case R_AARCH64_MOVW_UABS_G1_NC:
+    or32le(Loc, (Val & 0xFFFF0000) >> 11);
+    break;
+  case R_AARCH64_MOVW_UABS_G2_NC:
+    or32le(Loc, (Val & 0xFFFF00000000) >> 27);
+    break;
+  case R_AARCH64_MOVW_UABS_G3:
+    or32le(Loc, (Val & 0xFFFF000000000000) >> 43);
+    break;
   default:
     fatal("unrecognized reloc " + Twine(Type));
   }


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