[uclibc-ng-devel] Antwort: Re: thumb_swp/thumb_swpb

Florian La Roche F.LaRoche at pilz.de
Wed May 30 15:12:16 CEST 2018


Hello Waldemar Brodkorb,

seems this is triggered if gcc (also with older versions) compiles for 
coretex-a53
if thumb-mode is enabled. (So this would trigger if e.g. 
raspberrypi3_defconfig
gets thumb mode enabled or if you change vexpress_defconfig to compile for 
a53.)

The error output from gcc is:
AS ldso/ldso/arm/thumb_atomics.oS
ldso/ldso/arm/thumb_atomics.S: Assembler messages:
ldso/ldso/arm/thumb_atomics.S:49: Error: swp{b} use is obsoleted for ARMv8 
and later
ldso/ldso/arm/thumb_atomics.S:55: Error: swp{b} use is obsoleted for ARMv8 
and later
Makerules:373: recipe for target 'ldso/ldso/arm/thumb_atomics.oS' failed


How to reproduce this:
git clone https://github.com/buildroot/buildroot.git
pushd buildroot
patch -s -p1 < ../buildroot.patch
make qemu_arm_vexpress_defconfig
make
popd

with buildroot.patch:
diff --git a/configs/qemu_arm_vexpress_defconfig 
b/configs/qemu_arm_vexpress_defconfig
index 34a50aa8d5..2f3e8a7c54 100644
--- a/configs/qemu_arm_vexpress_defconfig
+++ b/configs/qemu_arm_vexpress_defconfig
@@ -1,9 +1,11 @@
 # Architecture
 BR2_arm=y
-BR2_cortex_a9=y
+BR2_cortex_a53=y
 BR2_ARM_ENABLE_NEON=y
 BR2_ARM_ENABLE_VFP=y
-BR2_ARM_FPU_VFPV3D16=y
+BR2_ARM_FPU_VFPV4=y
+
+BR2_ARM_INSTRUCTIONS_THUMB2=y
 
 # System
 BR2_SYSTEM_DHCP="eth0"


Do you know which software depends on this spcial function to exist in 
uclibc-ng?


best regards,

Florian La Roche




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