baffdb8bc2
This change introduces new synthetic sections IpltSection, IgotPltSection that represent the ifunc entries that would previously have been put in the PltSection and the GotPltSection. The separation makes sure that the R_*_IRELATIVE relocations are placed after the non R_*_IRELATIVE relocations, which permits ifunc resolvers to know that the .got.plt slots will be initialized prior to the resolver being called. A secondary benefit is that for ARM we can move the IgotPltSection and its dynamic relocations to the .got and .rel.dyn as the ARM glibc expects all the R_*_IRELATIVE relocations to be in the .rel.dyn Differential revision: https://reviews.llvm.org/D27406 llvm-svn: 289045
128 lines
3.5 KiB
ArmAsm
128 lines
3.5 KiB
ArmAsm
// RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
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// RUN: ld.lld -static %t.o -o %tout
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// RUN: llvm-objdump -d %tout | FileCheck %s --check-prefix=DISASM
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// RUN: llvm-readobj -r -symbols -sections %tout | FileCheck %s
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// REQUIRES: x86
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// CHECK: Sections [
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// CHECK: Section {
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// CHECK: Index: 1
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// CHECK-NEXT: Name: .rela.plt
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// CHECK-NEXT: Type: SHT_RELA
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// CHECK-NEXT: Flags [
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// CHECK-NEXT: SHF_ALLOC
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// CHECK-NEXT: ]
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// CHECK-NEXT: Address: [[RELA:.*]]
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// CHECK-NEXT: Offset: 0x158
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// CHECK-NEXT: Size: 48
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// CHECK-NEXT: Link: 6
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// CHECK-NEXT: Info: 0
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// CHECK-NEXT: AddressAlignment: 8
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// CHECK-NEXT: EntrySize: 24
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// CHECK-NEXT: }
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// CHECK: Relocations [
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// CHECK-NEXT: Section ({{.*}}) .rela.plt {
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// CHECK-NEXT: 0x202000 R_X86_64_IRELATIVE
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// CHECK-NEXT: 0x202008 R_X86_64_IRELATIVE
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// CHECK-NEXT: }
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// CHECK-NEXT: ]
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// CHECK: Symbols [
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// CHECK-NEXT: Symbol {
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// CHECK-NEXT: Name:
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// CHECK-NEXT: Value: 0x0
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// CHECK-NEXT: Size: 0
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// CHECK-NEXT: Binding: Local
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// CHECK-NEXT: Type: None
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// CHECK-NEXT: Other: 0
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// CHECK-NEXT: Section: Undefined
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// CHECK-NEXT: }
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// CHECK-NEXT: Symbol {
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// CHECK-NEXT: Name: __rela_iplt_end
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// CHECK-NEXT: Value: 0x200188
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// CHECK-NEXT: Size: 0
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// CHECK-NEXT: Binding: Local
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// CHECK-NEXT: Type: None
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// CHECK-NEXT: Other [
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// CHECK-NEXT: STV_HIDDEN
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// CHECK-NEXT: ]
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// CHECK-NEXT: Section: .rela.plt
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// CHECK-NEXT: }
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// CHECK-NEXT: Symbol {
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// CHECK-NEXT: Name: __rela_iplt_start
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// CHECK-NEXT: Value: [[RELA]]
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// CHECK-NEXT: Size: 0
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// CHECK-NEXT: Binding: Local
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// CHECK-NEXT: Type: None
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// CHECK-NEXT: Other [
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// CHECK-NEXT: STV_HIDDEN
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// CHECK-NEXT: ]
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// CHECK-NEXT: Section: .rela.plt
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// CHECK-NEXT: }
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// CHECK-NEXT: Symbol {
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// CHECK-NEXT: Name: _start
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// CHECK-NEXT: Value: 0x201002
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// CHECK-NEXT: Size: 0
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// CHECK-NEXT: Binding: Global
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// CHECK-NEXT: Type: None
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// CHECK-NEXT: Other: 0
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// CHECK-NEXT: Section: .text
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// CHECK-NEXT: }
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// CHECK-NEXT: Symbol {
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// CHECK-NEXT: Name: bar
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// CHECK-NEXT: Value: 0x201001
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// CHECK-NEXT: Size: 0
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// CHECK-NEXT: Binding: Global
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// CHECK-NEXT: Type: GNU_IFunc
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// CHECK-NEXT: Other: 0
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// CHECK-NEXT: Section: .text
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// CHECK-NEXT: }
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// CHECK-NEXT: Symbol {
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// CHECK-NEXT: Name: foo
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// CHECK-NEXT: Value: 0x201000
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// CHECK-NEXT: Size: 0
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// CHECK-NEXT: Binding: Global
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// CHECK-NEXT: Type: GNU_IFunc
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// CHECK-NEXT: Other: 0
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// CHECK-NEXT: Section: .text
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// CHECK-NEXT: }
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// CHECK-NEXT: ]
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// DISASM: Disassembly of section .text:
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// DISASM-NEXT: foo:
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// DISASM-NEXT: 201000: {{.*}} retq
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// DISASM: bar:
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// DISASM-NEXT: 201001: {{.*}} retq
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// DISASM: _start:
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// DISASM-NEXT: 201002: {{.*}} callq 25
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// DISASM-NEXT: 201007: {{.*}} callq 36
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// DISASM-NEXT: 20100c: {{.*}} movl $2097496, %edx
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// DISASM-NEXT: 201011: {{.*}} movl $2097544, %edx
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// DISASM-NEXT: 201016: {{.*}} movl $2097545, %edx
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// DISASM-NEXT: Disassembly of section .plt:
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// DISASM-NEXT: .plt:
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// DISASM-NEXT: 201020: {{.*}} jmpq *4058(%rip)
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// DISASM-NEXT: 201026: {{.*}} pushq $0
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// DISASM-NEXT: 20102b: {{.*}} jmp -32 <_start+0xE>
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// DISASM-NEXT: 201030: {{.*}} jmpq *4050(%rip)
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// DISASM-NEXT: 201036: {{.*}} pushq $1
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// DISASM-NEXT: 20103b: {{.*}} jmp -48 <_start+0xE>
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.text
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.type foo STT_GNU_IFUNC
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.globl foo
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foo:
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ret
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.type bar STT_GNU_IFUNC
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.globl bar
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bar:
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ret
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.globl _start
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_start:
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call foo
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call bar
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movl $__rela_iplt_start,%edx
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movl $__rela_iplt_end,%edx
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movl $__rela_iplt_end + 1,%edx
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