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[ELF][test] Add a test to demonstrate #66836

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Fangrui Song 2023-09-20 09:04:41 -07:00
parent ad762f2a9f
commit 309d1c43bd
1 changed files with 62 additions and 0 deletions
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lld/test/ELF/linkerscript/locationcountererr-arm-exidx.test Normal file
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# REQUIRES: arm
# RUN: rm -rf %t && split-file %s %t && cd %t
# RUN: llvm-mc -filetype=obj -triple=armv7-linux-gnueabi a.s -o a.o
## If we don't merge adjacent duplicate entries, __code_size will be negative and
## . += __code_size will trigger a "move location counter backward" error.
## LLD may report more errors further down, but there is only one "move location counter backward" error.
# RUN: not ld.lld -z norelro -z max-page-size=4096 -T a.t a.o -o /dev/null --no-merge-exidx-entries 2>&1 | \
# RUN: FileCheck %s --check-prefix=ERR --implicit-check-not=error:
# ERR: error: a.t:14: unable to move location counter backward for: code.unused_space
# ERR-NEXT: error: a.t:9: unable to move location counter backward for: dummy1
# ERR-NEXT: error: a.t:10: unable to move location counter backward for: dummy2
# ERR-NEXT: error: a.t:14: unable to move location counter backward for: code.unused_space
# ERR-NEXT: error: a.t:9: unable to move location counter backward for: dummy1
# ERR-NEXT: error: a.t:10: unable to move location counter backward for: dummy2
# ERR-NEXT: error: a.t:14: unable to move location counter backward for: code.unused_space
# ERR-NEXT: error: section dummy1 at 0x1000 of size 0xFFFFFFFFFFFFFF6C exceeds available address space
# ERR-NEXT: error: section dummy2 at 0x2000 of size 0xFFFFFFFFFFFFFF6C exceeds available address space
# ERR-NEXT: error: section code.unused_space at 0x4104 of size 0xFFFFFFFFFFFFFF6C exceeds available address space
## If we merge adjacent duplicate entries, we will have enough space. Don't report
## a spurious error https://github.com/llvm/llvm-project/issues/66836
# RUN: not ld.lld -z norelro -z max-page-size=4096 -T a.t a.o -o /dev/null 2>&1 | FileCheck %s --check-prefix=ERR2
# ERR2: error: a.t:14: unable to move location counter backward for: code.unused_space
#--- a.s
.globl _start
_start:
bx lr
.macro A
.section .text.f\@,"ax"
.globl f\@
f\@:
.fnstart
bx lr
.cantunwind
.fnend
.endm
.rept 20
A
.endr
#--- a.t
MEMORY {
DUMMY1 (RW) : ORIGIN = 0x1000, LENGTH = 0x70
DUMMY2 (RW) : ORIGIN = 0x2000, LENGTH = 0x70
CODE (RX) : ORIGIN = 0x4000, LENGTH = 0x70
}
code_end = ORIGIN(CODE) + LENGTH(CODE);
SECTIONS {
dummy1 (NOLOAD) : { . += code_size; } > DUMMY1
dummy2 (NOLOAD) : { . += code_size; } > DUMMY2
.text : { *(.text .text.*) } > CODE
.ARM.exidx : { *(.ARM.exidx .ARM.exidx.*) } > CODE
code_size = code_end - .;
code.unused_space (NOLOAD) : { . += code_size; } > CODE
}