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21f2950167
Summary: This is the first in a series of patches to eventually add support for TLS relocations to RuntimeDyld. This patch resolves an issue in the current GOT handling, where GOT entries would be reused between object files, which leads to the same situation that necessitates the GOT in the first place, i.e. that the 32-bit offset can not cover all of the address space. Thus this patch makes the GOT object-file-local. Unfortunately, this still isn't quite enough, because the MemoryManager does not yet guarantee that sections are allocated sufficiently close to each other, even if they belong to the same object file. To address this concern, this patch also adds a small API abstraction on top of the GOT allocation mechanism that will allow (temporarily, until the MemoryManager is improved) using the stub mechanism instead of allocating a different section. The actual switch from separate section to stub mechanism will be part of a follow-on commit, so that it can be easily reverted independently at the appropriate time. Test Plan: Includes a test case where the GOT of two object files is artificially forced to be apart by several GB. Reviewers: lhames Reviewed By: lhames Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D8813 llvm-svn: 234839
32 lines
1.2 KiB
ArmAsm
32 lines
1.2 KiB
ArmAsm
# RUN: llvm-mc -triple=x86_64-pc-linux -relocation-model=pic -filetype=obj -o %T/test_ELF1_x86-64.o %s
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# RUN: llvm-mc -triple=x86_64-pc-linux -relocation-model=pic -filetype=obj -o %T/test_ELF2_x86-64.o %s
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# RUN: llc -mtriple=x86_64-pc-linux -relocation-model=pic -filetype=obj -o %T/test_ELF_ExternalGlobal_x86-64.o %S/Inputs/ExternalGlobal.ll
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# RUN: llvm-rtdyld -triple=x86_64-pc-linux -verify %T/test_ELF1_x86-64.o %T/test_ELF_ExternalGlobal_x86-64.o
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# Test that we can load this code twice at memory locations more than 2GB apart
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# RUN: llvm-rtdyld -triple=x86_64-pc-linux -verify -map-section test_ELF1_x86-64.o,.got=0x10000 -map-section test_ELF2_x86-64.o,.text=0x100000000 -map-section test_ELF2_x86-64.o,.got=0x100010000 %T/test_ELF1_x86-64.o %T/test_ELF2_x86-64.o %T/test_ELF_ExternalGlobal_x86-64.o
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# Assembly obtained by compiling the following and adding checks:
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# @G = external global i8*
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#
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# define i8* @foo() {
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# %ret = load i8** @G
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# ret i32 %ret
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# }
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#
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#
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.text
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.file "ELF_x64-64_PIC_relocations.ll"
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.align 16, 0x90
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.type foo,@function
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foo: # @foo
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# BB#0:
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movq G@GOTPCREL(%rip), %rax
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movl (%rax), %eax
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retq
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.Ltmp0:
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.size foo, .Ltmp0-foo
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.section ".note.GNU-stack","",@progbits
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