diff options
| author | Daniil Kovalev <dkovalev@accesssoftek.com> | 2024-05-31 14:57:58 +0300 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2024-05-31 14:57:58 +0300 |
| commit | 7acd2c0652250994a4d922bda7275d750f7bf1b7 (patch) | |
| tree | 2793f8ae9323943275d5d0b185c064d6054dc48c /lld | |
| parent | f917c396c9855d7e0af0b1b3e6209757c2de0b51 (diff) | |
| download | llvm-7acd2c0652250994a4d922bda7275d750f7bf1b7.zip llvm-7acd2c0652250994a4d922bda7275d750f7bf1b7.tar.gz llvm-7acd2c0652250994a4d922bda7275d750f7bf1b7.tar.bz2 | |
[lld][ELF][AArch64] Support `R_AARCH64_GOT_LD_PREL19` relocation (#89592)
With tiny code model, the GOT slot contents can be loaded via `ldr x0,
:got:sym` which corresponds to `R_AARCH64_GOT_LD_PREL19` static
GOT-relative relocation.
See
https://github.com/ARM-software/abi-aa/blob/main/aaelf64/aaelf64.rst#static-aarch64-relocations
Diffstat (limited to 'lld')
| -rw-r--r-- | lld/ELF/Arch/AArch64.cpp | 2 | ||||
| -rw-r--r-- | lld/test/ELF/aarch64-fpic-got.s | 41 |
2 files changed, 31 insertions, 12 deletions
diff --git a/lld/ELF/Arch/AArch64.cpp b/lld/ELF/Arch/AArch64.cpp index b0aa0b9..cf5c238 100644 --- a/lld/ELF/Arch/AArch64.cpp +++ b/lld/ELF/Arch/AArch64.cpp @@ -175,6 +175,7 @@ RelExpr AArch64::getRelExpr(RelType type, const Symbol &s, case R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: return R_AARCH64_GOT_PAGE_PC; case R_AARCH64_GOTPCREL32: + case R_AARCH64_GOT_LD_PREL19: return R_GOT_PC; case R_AARCH64_NONE: return R_NONE; @@ -473,6 +474,7 @@ void AArch64::relocate(uint8_t *loc, const Relocation &rel, break; case R_AARCH64_CONDBR19: case R_AARCH64_LD_PREL_LO19: + case R_AARCH64_GOT_LD_PREL19: checkAlignment(loc, val, 4, rel); checkInt(loc, val, 21, rel); or32le(loc, (val & 0x1FFFFC) << 3); diff --git a/lld/test/ELF/aarch64-fpic-got.s b/lld/test/ELF/aarch64-fpic-got.s index 48bd0e2..a77fd8f 100644 --- a/lld/test/ELF/aarch64-fpic-got.s +++ b/lld/test/ELF/aarch64-fpic-got.s @@ -1,26 +1,43 @@ # REQUIRES: aarch64 -# RUN: llvm-mc -filetype=obj -triple=aarch64-none-linux %s -o %t.o -# RUN: llvm-mc -filetype=obj -triple=aarch64-none-linux %p/Inputs/shared.s -o %t-lib.o -# RUN: ld.lld -shared %t-lib.o -soname t-lib.so -o %t-lib.so +# RUN: rm -rf %t && split-file %s %t && cd %t -# RUN: ld.lld %t-lib.so %t.o -o %t.exe -# RUN: llvm-readobj -r %t.exe | FileCheck --check-prefix=RELOC %s -# RUN: llvm-objdump --no-print-imm-hex -d --no-show-raw-insn %t.exe | FileCheck --check-prefix=DIS %s +# RUN: llvm-mc -filetype=obj -triple=aarch64-none-linux %p/Inputs/shared.s -o lib.o +# RUN: ld.lld -shared lib.o -soname lib.so -o lib.so ## Checks if got access to dynamic objects is done through a got relative ## dynamic relocation and not using plt relative (R_AARCH64_JUMP_SLOT). # RELOC: .rela.dyn { -# RELOC-NEXT: 0x220320 R_AARCH64_GLOB_DAT bar 0x0 +# RELOC-NEXT: 0x220318 R_AARCH64_GLOB_DAT bar 0x0 # RELOC-NEXT: } -## page(0x220320) - page(0x210000) = 65536 -## page(0x220320) & 0xff8 = 800 -# DIS: <_start>: -# DIS-NEXT: 210258: adrp x0, 0x220000 -# DIS-NEXT: 21025c: ldr x0, [x0, #800] +#--- small.s + +# RUN: llvm-mc -filetype=obj -triple=aarch64-none-linux small.s -o small.o +# RUN: ld.lld lib.so small.o -o small +# RUN: llvm-readobj -r small | FileCheck --check-prefix=RELOC %s +# RUN: llvm-objdump -d --no-show-raw-insn small | FileCheck --check-prefix=DIS-SMALL %s + +## page(0x220318) & 0xff8 = 0x318 +# DIS-SMALL: <_start>: +# DIS-SMALL-NEXT: adrp x0, 0x220000 +# DIS-SMALL-NEXT: ldr x0, [x0, #0x318] .globl _start _start: adrp x0, :got:bar ldr x0, [x0, :got_lo12:bar] + +#--- tiny.s + +# RUN: llvm-mc -filetype=obj -triple=aarch64-none-linux tiny.s -o tiny.o +# RUN: ld.lld lib.so tiny.o -o tiny +# RUN: llvm-readobj -r tiny | FileCheck --check-prefix=RELOC %s +# RUN: llvm-objdump -d --no-show-raw-insn tiny | FileCheck --check-prefix=DIS-TINY %s + +# DIS-TINY: <_start>: +# DIS-TINY-NEXT: ldr x0, 0x220318 + +.globl _start +_start: + ldr x0, :got:bar |