[ELF][PPC64] Fix getRelExpr for R_PPC64_REL64

[syzaara]

Summary

The relocation R_PPC64_REL64 should return R_PC for getRelExpr since it computes S + A - P.

[sfertile]

LGTM.

[ruiu]

LGTM

It might be a time to start considering the test file because it becomes perhaps too long. Smaller tests are easier to maintain.

lld/ELF/Arch/PPC64.cpp

case R_PPC64_TOC16_LO_DS:
     return R_GOTREL;
   case R_PPC64_TOC:
     return R_PPC_TOC;
   case R_PPC64_REL24:
     return R_PPC_CALL_PLT;
   case R_PPC64_REL16_LO:
   case R_PPC64_REL16_HA:
   case R_PPC64_REL32:
+  case R_PPC64_REL64:
     return R_PC;
   default:
     return R_ABS;
   }
 }
 
 void PPC64::writeGotHeader(uint8_t *Buf) const {
   write64(Buf, getPPC64TocBase());

lld/test/ELF/ppc64-relocs.s

 # REQUIRES: ppc
 
 # RUN: llvm-mc -filetype=obj -triple=powerpc64le-unknown-linux %s -o %t
 # RUN: ld.lld %t -o %t2
-# RUN: llvm-objdump -D %t2 | FileCheck %s --check-prefix=rodataLE
+# RUN: llvm-objdump -D %t2 | FileCheck %s --check-prefix=DATALE
 # RUN: llvm-objdump -D %t2 | FileCheck %s
 
 # RUN: llvm-mc -filetype=obj -triple=powerpc64-unknown-linux %s -o %t
 # RUN: ld.lld %t -o %t2
-# RUN: llvm-objdump -D %t2 | FileCheck %s --check-prefix=rodataBE
+# RUN: llvm-objdump -D %t2 | FileCheck %s --check-prefix=DATABE
 # RUN: llvm-objdump -D %t2 | FileCheck %s
 
 .text
 .global _start
 _start:
 .Lfoo:
   li      0,1
   li      3,42

 .section  .R_PPC64_REL32, "ax",@progbits
 .globl .FR_PPC64_REL32
 .FR_PPC64_REL32:
   addis 5, 2, .LC0@toc@ha
   ld 5, .LC0@toc@l(5)
 .LBB0_2:
   add 3, 3, 4
 
-# rodataLE: Disassembly of section .rodata:
-# rodataLE: .rodata:
-# rodataLE: 10000190: b4 fe 00 00
-
-# rodataBE: Disassembly of section .rodata:
-# rodataBE: .rodata:
-# rodataBE: 10000190: 00 00 fe b4
+# DATALE: Disassembly of section .rodata:
+# DATALE: .rodata:
+# DATALE: 10000190: b4 fe 00 00
+
+# DATABE: Disassembly of section .rodata:
+# DATABE: .rodata:
+# DATABE: 10000190: 00 00 fe b4
 
 # Address of rodata + value stored at rodata entry
 # should equal address of LBB0_2.
 # 0x10000190 + 0xfeb4 = 0x10010044
 # CHECK: Disassembly of section .R_PPC64_REL32:
 # CHECK: .FR_PPC64_REL32:
 # CHECK: 1001003c: {{.*}} addis 5, 2, 0
 # CHECK: 10010040: {{.*}} ld 5, -32736(5)
 # CHECK: 10010044: {{.*}} add 3, 3, 4
+
+.section .R_PPC64_REL64, "ax",@progbits
+.globl  .FR_PPC64_REL64
+.FR_PPC64_REL64:
+        .cfi_startproc
+        .cfi_personality 148, __foo
+        li 0, 1
+        li 3, 55
+        sc
+        .cfi_endproc
+__foo:
+  li 3,0
+
+# Check that address of eh_frame entry + value stored
+# should equal the address of foo. Since it is not aligned,
+# the entry is not stored exactly at 100001a8. It starts at
+# address 0x100001aa and has the value 0xfeaa.
+# 0x100001aa + 0xfeaa = 0x10010054
+# DATALE: Disassembly of section .eh_frame:
+# DATALE: .eh_frame:
+# DATALE: 100001a8: {{.*}} aa fe
+
+# DATABE: Disassembly of section .eh_frame:
+# DATABE: .eh_frame:
+# DATABE: 100001b0: fe aa {{.*}}
+
+# CHECK: __foo
+# CHECK-NEXT: 10010054: {{.*}} li 3, 0