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| author | Fangrui Song <i@maskray.me> | 2020-01-28 00:01:20 -0800 |
|---|---|---|
| committer | Fangrui Song <i@maskray.me> | 2020-01-28 11:04:33 -0800 |
| commit | 684c216d73cdcd64fc0186b533870cb79dc03810 (patch) | |
| tree | b2daee58a29203253729a3ebf45979dd5811703d /lld/test | |
| parent | 54b022d344412fc9f1dfe37ee05de934a01e1ea4 (diff) | |
| download | bcm5719-llvm-684c216d73cdcd64fc0186b533870cb79dc03810.tar.gz bcm5719-llvm-684c216d73cdcd64fc0186b533870cb79dc03810.zip | |
[ELF][PPC32] Support --emit-relocs link of R_PPC_PLTREL24
Similar to R_MIPS_GPREL16 and R_MIPS_GPREL32 (D45972).
If the addend of an R_PPC_PLTREL24 is >= 0x8000, it indicates that r30
is relative to the input section .got2.
```
addis 30, 30, .got2+0x8000-.L1$pb@ha
addi 30, 30, .got2+0x8000-.L1$pb@l
...
bl foo+0x8000@PLT
```
After linking, the relocation will be relative to the output section .got2.
To compensate for the shift `address(input section .got2) - address(output section .got2) = ppc32Got2OutSecOff`, adjust by `ppc32Got2OutSecOff`:
```
addis 30, 30, .got2+0x8000-.L1+ppc32Got2OutSecOff$pb@ha
addi 30, 30, .got2+0x8000-.L1+ppc32Got2OutSecOff$pb@ha$pb@l
...
bl foo+0x8000+ppc32Got2OutSecOff@PLT
```
This rule applys to a relocatable link or a non-relocatable link with --emit-relocs.
Reviewed By: Bdragon28
Differential Revision: https://reviews.llvm.org/D73532
(cherry picked from commit e11b709b1922ca46b443fcfa5d76b87edca48721)
Diffstat (limited to 'lld/test')
| -rw-r--r-- | lld/test/ELF/ppc32-relocatable-got2.s | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/lld/test/ELF/ppc32-relocatable-got2.s b/lld/test/ELF/ppc32-relocatable-got2.s new file mode 100644 index 00000000000..06ccb39b6a4 --- /dev/null +++ b/lld/test/ELF/ppc32-relocatable-got2.s @@ -0,0 +1,41 @@ +# REQUIRES: ppc +## Test addend adjustment of R_PPC_PLTREL24 when copying relocations. +## If r_addend indicates .got2, adjust it by the local .got2's output section offset. + +# RUN: llvm-mc -filetype=obj -triple=powerpc %s -o %t.o +# RUN: ld.lld -r %t.o %t.o -o %t +# RUN: llvm-readobj -r %t | FileCheck %s + +# RUN: ld.lld -shared --emit-relocs %t.o %t.o -o %t.so +# RUN: llvm-readobj -r %t.so | FileCheck %s + +# CHECK: .rela.adjust { +# CHECK-NEXT: R_PPC_REL16_HA .got2 0x8002 +# CHECK-NEXT: R_PPC_REL16_LO .got2 0x8006 +# CHECK-NEXT: R_PPC_PLTREL24 foo 0x8000 +# CHECK-NEXT: R_PPC_PLTREL24 bar 0x8000 +# CHECK-NEXT: R_PPC_REL16_HA .got2 0x8006 +# CHECK-NEXT: R_PPC_REL16_LO .got2 0x800A +# CHECK-NEXT: R_PPC_PLTREL24 foo 0x8004 +# CHECK-NEXT: R_PPC_PLTREL24 bar 0x8004 +# CHECK-NEXT: } +# CHECK-NEXT: .rela.no_adjust { +# CHECK-NEXT: R_PPC_PLTREL24 foo 0x0 +# CHECK-NEXT: R_PPC_PLTREL24 foo 0x0 +# CHECK-NEXT: } +.section .got2,"aw" +.long 0 + +.section .adjust,"ax" +bcl 20,30,.L0 +.L0: +addis 30,30,.got2+0x8000-.L0@ha +addi 30,30,.got2+0x8000-.L0@l + +## Refers to .got2+addend, adjust. +bl foo+0x8000@plt +bl bar+0x8000@plt + +.section .no_adjust,"ax" +## Refers to .got, no adjustment. +bl foo@plt |
