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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 11:04:04 -0800 |
| commit | e11b709b1922ca46b443fcfa5d76b87edca48721 (patch) | |
| tree | 04ee9ecd6c4a66a8753591bf6de888e81525a3e2 /clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp | |
| parent | a1f6ff26814b86fdd7dfc9083bbefe5cf1790ab8 (diff) | |
| download | llvm-e11b709b1922ca46b443fcfa5d76b87edca48721.zip llvm-e11b709b1922ca46b443fcfa5d76b87edca48721.tar.gz llvm-e11b709b1922ca46b443fcfa5d76b87edca48721.tar.bz2 | |
[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
Diffstat (limited to 'clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp')
0 files changed, 0 insertions, 0 deletions