maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/lld/test/ELF/partition-dynamic-linker.s

Ignoring revisions in .git-blame-ignore-revs. Click here to bypass and see the normal blame view.

26 lines
682 B
ArmAsm
Raw Normal View History

ELF: Add .interp synthetic sections first in createSyntheticSections(). Our .interp section is not a SyntheticSection. As a result, it terminates the loop in removeUnusedSyntheticSections(). This has at least two consequences: - The synthetic .bss and .bss.rel.ro sections are always present in dynamically linked executables, even when they are not needed. - The synthetic .ARM.exidx (and possibly other) sections are always present in partitions other than the last one, even when not needed. .ARM.exidx in particular is problematic because it assumes that its list of code sections is non-empty in getLinkOrderDep(), which can lead to a crash if the partition does not have any code sections. Fix these problems by moving the creation of the .interp sections to the top of createSyntheticSections(). While here, make the code a little less error-prone by changing the add() lambdas to take a SyntheticSection instead of an InputSectionBase. Differential Revision: https://reviews.llvm.org/D68256 llvm-svn: 373347
2019-10-02 00:10:13 +08:00
## Test that we don't create a .ARM.exidx for the main partition.
## Previously we were doing so, which is unnecessary and led to a crash.
Add missing REQUIRES: arm. llvm-svn: 373357
2019-10-02 01:35:56 +08:00
# REQUIRES: arm
ELF: Add .interp synthetic sections first in createSyntheticSections(). Our .interp section is not a SyntheticSection. As a result, it terminates the loop in removeUnusedSyntheticSections(). This has at least two consequences: - The synthetic .bss and .bss.rel.ro sections are always present in dynamically linked executables, even when they are not needed. - The synthetic .ARM.exidx (and possibly other) sections are always present in partitions other than the last one, even when not needed. .ARM.exidx in particular is problematic because it assumes that its list of code sections is non-empty in getLinkOrderDep(), which can lead to a crash if the partition does not have any code sections. Fix these problems by moving the creation of the .interp sections to the top of createSyntheticSections(). While here, make the code a little less error-prone by changing the add() lambdas to take a SyntheticSection instead of an InputSectionBase. Differential Revision: https://reviews.llvm.org/D68256 llvm-svn: 373347
2019-10-02 00:10:13 +08:00
# RUN: llvm-mc -filetype=obj -triple=armv7a-none-linux-gnueabi %p/Inputs/shared.s -o %t1.o
# RUN: ld.lld -shared %t1.o -o %t.so
# RUN: llvm-mc -filetype=obj -triple=armv7a-none-linux-gnueabi %s -o %t.o
# RUN: ld.lld -shared --gc-sections --dynamic-linker foo %t.o %t.so -o %t
# RUN: llvm-readelf --section-headers %t | FileCheck %s
# CHECK: .ARM.exidx
# CHECK-NOT: .ARM.exidx
.section .llvm_sympart,"",%llvm_sympart
.asciz "part1"
.4byte p1
.section .text.p1,"ax",%progbits
.globl p1
p1:
.fnstart
bx lr
.cantunwind
.fnend