cf783be8d7
(Fixed an issue about GOT on a copy relocated alias.) (Fixed an issue about not creating r_addend=0 IRELATIVE for unreferenced non-preemptible ifunc.) The idea is to make scanRelocations mark some actions are needed (GOT/PLT/etc) and postpone the real work to postScanRelocations. It gives some flexibility: * Make it feasible to support .plt.got (PR32938): we need to know whether GLOB_DAT and JUMP_SLOT are both needed. * Make non-preemptible IFUNC handling slightly cleaner: avoid setting/clearing sym.gotInIgot * -z nocopyrel: report all copy relocation places for one symbol * Make GOT deduplication feasible * Make parallel relocation scanning feasible (if we can avoid all stateful operations and make Symbol attributes atomic), but parallelism may not be the appealing choice Since this patch moves a large chunk of code out of ELFT templates. My x86-64 executable is actually a few hundred bytes smaller. For ppc32-ifunc-nonpreemptible-pic.s: I remove absolute relocation references to non-preemptible ifunc because absolute relocation references are incorrect in -fpie mode. Reviewed By: peter.smith, ikudrin Differential Revision: https://reviews.llvm.org/D114783
156 lines
4.1 KiB
ArmAsm
156 lines
4.1 KiB
ArmAsm
// REQUIRES: x86
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// RUN: llvm-mc -filetype=obj -triple=i686-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 --no-show-raw-insn %tout | FileCheck %s --check-prefix=DISASM
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// RUN: llvm-readobj -r --symbols --sections %tout | FileCheck %s
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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: .rel.dyn
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// CHECK-NEXT: Type: SHT_REL
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// CHECK-NEXT: Flags [
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// CHECK-NEXT: SHF_ALLOC
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// CHECK-NEXT: SHF_INFO_LINK
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// CHECK-NEXT: ]
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// CHECK-NEXT: Address: [[RELA:.*]]
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// CHECK-NEXT: Offset: 0xD4
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// CHECK-NEXT: Size: 16
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// CHECK-NEXT: Link: 0
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// CHECK-NEXT: Info: 4
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// CHECK-NEXT: AddressAlignment: 4
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// CHECK-NEXT: EntrySize: 8
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// CHECK-NEXT: }
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// CHECK: Relocations [
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// CHECK-NEXT: Section ({{.*}}) .rel.dyn {
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// CHECK-NEXT: 0x402120 R_386_IRELATIVE
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// CHECK-NEXT: 0x402124 R_386_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: __rel_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: .rel.dyn
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// CHECK-NEXT: }
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// CHECK-NEXT: Symbol {
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// CHECK-NEXT: Name: __rel_iplt_end
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// CHECK-NEXT: Value: 0x4000E4
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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: .rel.dyn
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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: 0x401100
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// CHECK-NEXT: Size: 0
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// CHECK-NEXT: Binding: Global
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// CHECK-NEXT: Type: Function
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// CHECK-NEXT: Other: 0
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// CHECK-NEXT: Section: .iplt
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// CHECK-NEXT: }
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// CHECK-NEXT: Symbol {
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// CHECK-NEXT: Name: bar_resolver
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// CHECK-NEXT: Value: 0x4010E4
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// CHECK-NEXT: Size: 0
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// CHECK-NEXT: Binding: Global
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// CHECK-NEXT: Type: Function
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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: 0x401110
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// CHECK-NEXT: Size: 0
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// CHECK-NEXT: Binding: Global
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// CHECK-NEXT: Type: Function
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// CHECK-NEXT: Other: 0
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// CHECK-NEXT: Section: .iplt
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// CHECK-NEXT: }
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// CHECK-NEXT: Symbol {
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// CHECK-NEXT: Name: foo_resolver
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// CHECK-NEXT: Value: 0x4010E5
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// CHECK-NEXT: Size: 0
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// CHECK-NEXT: Binding: Global
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// CHECK-NEXT: Type: Function
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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: _start
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// CHECK-NEXT: Value: 0x4010E6
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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:]
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// DISASM: Disassembly of section .text:
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// DISASM-EMPTY:
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// DISASM-NEXT: <bar_resolver>:
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// DISASM-NEXT: 4010e4: retl
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// DISASM: <foo_resolver>:
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// DISASM-NEXT: 4010e5: retl
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// DISASM: <_start>:
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// DISASM-NEXT: 4010e6: calll 0x401110 <foo>
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// DISASM-NEXT: calll 0x401100 <bar>
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// DISASM-NEXT: movl $4194516, %edx
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// DISASM-NEXT: movl $4194532, %edx
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// DISASM-EMPTY:
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// DISASM-NEXT: Disassembly of section .iplt:
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// DISASM-EMPTY:
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// DISASM-NEXT: <bar>:
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// DISASM-NEXT: 401100: jmpl *4202784
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// DISASM-NEXT: pushl $0
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// DISASM-NEXT: jmp 0x0
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// DISASM: <foo>:
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// DISASM-NEXT: 401110: jmpl *4202788
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// DISASM-NEXT: pushl $8
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// DISASM-NEXT: jmp 0x0
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.type bar STT_GNU_IFUNC
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.globl bar
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bar:
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.type bar_resolver STT_FUNC
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.globl bar_resolver
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bar_resolver:
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ret
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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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.type foo_resolver STT_FUNC
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.globl foo_resolver
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foo_resolver:
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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 $__rel_iplt_start,%edx
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movl $__rel_iplt_end,%edx
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