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Re-apply "[JITLink][ELF] Add support for ELF::R_X86_64_REX_GOTPCRELX relocation"

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This re-applies e2fceec2fd1 with fixes. Apparently we already *do* support
relaxation for ELF, so we need to make sure the test case allocates a slab at
a fixed address, and that the R_X86_64_REX_GOTPCRELX test references an external
that is guaranteed to be out of range.
This commit is contained in:
Lang Hames 2020-10-22 23:24:40 -07:00
parent f5744161af
commit a156cf61cb
2 changed files with 19 additions and 4 deletions
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1
lib/ExecutionEngine/JITLink/ELF_x86_64.cpp
View File

@ -232,6 +232,7 @@ private:
case ELF::R_X86_64_64:
return ELF_x86_64_Edges::ELFX86RelocationKind::Pointer64;
case ELF::R_X86_64_GOTPCREL:
case ELF::R_X86_64_REX_GOTPCRELX:
return ELF_x86_64_Edges::ELFX86RelocationKind::PCRel32GOTLoad;
}
return make_error<JITLinkError>("Unsupported x86-64 relocation:" +

22
test/ExecutionEngine/JITLink/X86/ELF_x86-64_relocations.s
View File

@ -1,6 +1,7 @@
# RUN: rm -rf %t && mkdir -p %t
# RUN: llvm-mc -triple=x86_64-unknown-linux -position-independent -filetype=obj -o %t/elf_reloc.o %s
# RUN: llvm-jitlink -noexec -check %s %t/elf_reloc.o
# RUN: llvm-jitlink -noexec -slab-allocate 100Kb -slab-address 0xfff00000 \
# RUN: -define-abs external_data=0x1 -check %s %t/elf_reloc.o
#
# Test standard ELF relocations.
@ -39,12 +40,25 @@ test_gotpcrel:
.Lend_test_gotpcrel:
.size test_gotpcrel, .Lend_test_gotpcrel-test_gotpcrel
# Test REX_GOTPCRELX handling. We want to check both the offset to the GOT entry and its
# contents.
# jitlink-check: decode_operand(test_rex_gotpcrelx, 4) = \
# jitlink-check: got_addr(elf_reloc.o, external_data) - next_pc(test_rex_gotpcrelx)
.globl test_rex_gotpcrelx
.p2align 4, 0x90
.type test_rex_gotpcrelx,@function
test_rex_gotpcrelx:
movq external_data@GOTPCREL(%rip), %rax
.Lend_test_rex_gotpcrelx:
.size test_rex_gotpcrelx, .Lend_test_rex_gotpcrelx-test_rex_gotpcrelx
.type named_data,@object
.data
.p2align 2
.p2align 3
named_data:
.long 42
.size named_data, 4
.quad 42
.size named_data, 8
# Test BSS / zero-fill section handling.
# llvm-jitlink: *{4}bss_variable = 0