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[ELF][test] Test unreferenced non-preemptible ifunc 

Add missing coverage exposed by D114783.
There should be no associated IRELATIVE, otherwise (a) glibc ld.so may
crash (b) it wastes space (c) unused IPLT causes confusion.
This commit is contained in:
Fangrui Song 2021-12-14 16:25:50 -08:00
parent 51776ecaff
commit 04cf411c94
1 changed files with 15 additions and 11 deletions
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26
lld/test/ELF/gnu-ifunc-nonpreemptible.s
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@ -1,7 +1,7 @@
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o
# RUN: ld.lld %t.o -o %t
# RUN: llvm-objdump -d %t | FileCheck %s --check-prefix=DISASM
# RUN: llvm-objdump -d --no-show-raw-insn %t | FileCheck %s --check-prefix=DISASM
# RUN: llvm-readelf -r -s %t | FileCheck %s
# RUN: ld.lld --export-dynamic %t.o -o %t
@ -26,22 +26,21 @@
# DISASM: Disassembly of section .text:
# DISASM-EMPTY:
# DISASM-NEXT: <foo>:
# DISASM-NEXT: 201188: {{.*}} retq
# DISASM: <bar>:
# DISASM-NEXT: 201189: {{.*}} retq
# DISASM: <unused>:
# DISASM: <_start>:
# DISASM-NEXT: 20118a: {{.*}} callq 0x2011a0
# DISASM-NEXT: 20118f: {{.*}} callq 0x2011b0
# DISASM-NEXT: callq 0x[[#%x,foo:]]
# DISASM-NEXT: callq 0x[[#%x,bar:]]
# DISASM-EMPTY:
# DISASM-NEXT: Disassembly of section .iplt:
# DISASM-EMPTY:
# DISASM-NEXT: <.iplt>:
# DISASM-NEXT: 2011a0: {{.*}} jmpq *{{.*}}(%rip) # 0x2021d0
# DISASM-NEXT: 2011a6: {{.*}} pushq $0
# DISASM-NEXT: 2011ab: {{.*}} jmp 0x0
# DISASM-NEXT: 2011b0: {{.*}} jmpq *{{.*}}(%rip) # 0x2021d8
# DISASM-NEXT: 2011b6: {{.*}} pushq $1
# DISASM-NEXT: 2011bb: {{.*}} jmp 0x0
# DISASM-NEXT: [[#foo]]: jmpq *{{.*}}(%rip)
# DISASM-NEXT: pushq $0
# DISASM-NEXT: jmp 0x0
# DISASM-NEXT: [[#bar]]: jmpq *{{.*}}(%rip)
# DISASM-NEXT: pushq $1
# DISASM-NEXT: jmp 0x0
.text
.type foo STT_GNU_IFUNC
@ -54,6 +53,11 @@ foo:
bar:
ret
.type unused, @gnu_indirect_function
.globl unused
unused:
ret
.weak __rela_iplt_start
.weak __rela_iplt_end