https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96828
Bug ID: 96828
Summary: Wrong code generated with -fstack-protector and
-msingle-pic-base
Product: gcc
Version: 10.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: abatur45 at gmail dot com
Target Milestone: ---
Created attachment 49143
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49143&action=edit
test case
$ arm-none-eabi-gcc -v
Using built-in specs.
COLLECT_GCC=./gcc/gcc-arm-none-eabi-10-2020-q2-preview/bin/arm-none-eabi-gcc
COLLECT_LTO_WRAPPER=/mnt/c/Users/Ilya/Desktop/bug/gcc/gcc-arm-none-eabi-10-2020-q2-preview/bin/../lib/gcc/arm-none-eabi/10.1.1/lto-wrapper
Target: arm-none-eabi
Configured with:
/mnt/workspace/workspace/GCC-10-pipeline/jenkins-GCC-10-pipeline-13_20200625_1593044217/src/gcc/configure
--target=arm-none-eabi
--prefix=/mnt/workspace/workspace/GCC-10-pipeline/jenkins-GCC-10-pipeline-13_20200625_1593044217/install-native
--libexecdir=/mnt/workspace/workspace/GCC-10-pipeline/jenkins-GCC-10-pipeline-13_20200625_1593044217/install-native/lib
--infodir=/mnt/workspace/workspace/GCC-10-pipeline/jenkins-GCC-10-pipeline-13_20200625_1593044217/install-native/share/doc/gcc-arm-none-eabi/info
--mandir=/mnt/workspace/workspace/GCC-10-pipeline/jenkins-GCC-10-pipeline-13_20200625_1593044217/install-native/share/doc/gcc-arm-none-eabi/man
--htmldir=/mnt/workspace/workspace/GCC-10-pipeline/jenkins-GCC-10-pipeline-13_20200625_1593044217/install-native/share/doc/gcc-arm-none-eabi/html
--pdfdir=/mnt/workspace/workspace/GCC-10-pipeline/jenkins-GCC-10-pipeline-13_20200625_1593044217/install-native/share/doc/gcc-arm-none-eabi/pdf
--enable-languages=c,c++ --enable-plugins --disable-decimal-float
--disable-libffi --disable-libgomp --disable-libmudflap --disable-libquadmath
--disable-libssp --disable-libstdcxx-pch --disable-nls --disable-shared
--disable-threads --disable-tls --with-gnu-as --with-gnu-ld --with-newlib
--with-headers=yes --with-python-dir=share/gcc-arm-none-eabi
--with-sysroot=/mnt/workspace/workspace/GCC-10-pipeline/jenkins-GCC-10-pipeline-13_20200625_1593044217/install-native/arm-none-eabi
--build=x86_64-linux-gnu --host=x86_64-linux-gnu
--with-gmp=/mnt/workspace/workspace/GCC-10-pipeline/jenkins-GCC-10-pipeline-13_20200625_1593044217/build-native/host-libs/usr
--with-mpfr=/mnt/workspace/workspace/GCC-10-pipeline/jenkins-GCC-10-pipeline-13_20200625_1593044217/build-native/host-libs/usr
--with-mpc=/mnt/workspace/workspace/GCC-10-pipeline/jenkins-GCC-10-pipeline-13_20200625_1593044217/build-native/host-libs/usr
--with-isl=/mnt/workspace/workspace/GCC-10-pipeline/jenkins-GCC-10-pipeline-13_20200625_1593044217/build-native/host-libs/usr
--with-libelf=/mnt/workspace/workspace/GCC-10-pipeline/jenkins-GCC-10-pipeline-13_20200625_1593044217/build-native/host-libs/usr
--with-host-libstdcxx='-static-libgcc -Wl,-Bstatic,-lstdc++,-Bdynamic -lm'
--with-pkgversion='GNU Arm Embedded Toolchain 10-2020-q2-preview'
--with-multilib-list=rmprofile,aprofile
Thread model: single
Supported LTO compression algorithms: zlib
gcc version 10.1.1 20200529 (release) (GNU Arm Embedded Toolchain
10-2020-q2-preview)
Compilation of the test case with options "arm-none-eabi-gcc -c bug.c
-fstack-protector -fpie -mno-pic-data-is-text-relative -msingle-pic-base", uses
wrong register for GOT access when storing and loading stack canary (variable
access included to demonstrate correct behavior):
push {fp, lr}
add fp, sp, #4
sub sp, sp, #8
ldr r3, .L4
@ r2 is used instead of r9
ldr r3, [r2, r3]
ldr r3, [r3]
str r3, [fp, #-8]
mov r3, #0
ldr r3, .L4+4
@ correct behavior, r9 is used as base
ldr r3, [r9, r3]
ldr r3, [r3]
ldr r2, .L4
@ r1 is used instead of r9
ldr r2, [r1, r2]
ldr r1, [r2]
ldr r2, [fp, #-8]
eors r1, r2, r1
beq .L3
bl __stack_chk_fail(PLT)
.L3:
mov r0, r3
sub sp, fp, #4
pop {fp, lr}
bx lr
