[uclibc-ng-devel] Re: [RFC 0/2] xtensa: add FDPIC ABI support

On Fri, May 3, 2024 at 5:55 AM Waldemar Brodkorb wbx@openadk.org wrote:

Now I am booting up the system in Qemu with following command: qemu-system-xtensa -nographic -M lx60 -cpu dc233c -kernel qemu-xtensa-initramfspiggyback-kernel

Now every command f.e. ls or ps works but gives a Illegal Instruction in dmesg after exit(0).

[ 12.727280] Illegal Instruction in 'hush' (pid = 26, pc = 0x01d52e30) [ 57.203598] Illegal Instruction in 'hush' (pid = 29, pc = 0x01d52e30)

Looks like that kernel is built without call0 userspace ABI support. CONFIG_USER_ABI_CALL0_ONLY or CONFIG_USER_ABI_CALL0_PROBE need to be set in the kernel config for correct signal delivery to call0 processes.