qemu-system-m68k segfaults on opcode 0x4848

Host environment

• Operating system: Ubuntu 22.10

• OS/kernel version: Linux skylake 5.19.0-1015-lowlatency #16-Ubuntu SMP PREEMPT_DYNAMIC Thu Jan 5 20:11:09 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

• Architecture: x86-64

• QEMU flavor: qemu-system-m68k

• QEMU version: QEMU emulator version 7.0.0 (Debian 1:7.0+dfsg-7ubuntu2.1)

• QEMU command line: qemu-system-m68k -boot c -M q800 -serial none -serial mon:stdio -m 1000M -net nic,model=dp83932,addr=08:00:07:12:34:89 -net user -append "root=/dev/sda2 rw console=ttyS0 console=tty" -kernel virt/vmlinux-4.16.0-1-m68k -initrd virt/initrd.img-4.16.0-1-m68k -drive file=virt/debian-m68k-deb10.qcow2,format=qcow2 -nographic

cat oops.c
int main(void)
{
	__asm__ __volatile__(".byte 0x48, 0x48");
	return 0;
}

cking@debian-m68k:~$ gcc oops.c
cking@debian-m68k:~$ ./a.out 
./debian-m68k.sh: line 10:  4420 Segmentation fault      (core dumped) qemu-system-m68k -boot c -M q800 -serial none -serial mon:stdio -m 1000M -net nic,model=dp83932,addr=08:00:07:12:34:89 -net user -append "root=/dev/sda2 rw console=ttyS0 console=tty" -kernel virt/vmlinux-4.16.0-1-m68k -initrd virt/initrd.img-4.16.0-1-m68k -drive file=virt/debian-m68k-deb10.qcow2,format=qcow2 -nographic

Emulated/Virtualized environment

• Operating system: Debian m68k bookworm

• OS/kernel version: Linux debian-m68k 4.16.0-1-m68k #1 Debian 4.16.5-1 (2018-04-29) m68k GNU/Linux

• Architecture: m68k

Description of problem

Running an m68k executable with opcode 0x4848 will segfault qemu-system-m68k

Steps to reproduce

1. Boot m68k debian
2. Compile program (see above for the oops.c source) that executes opcode 0x4848
3. Run program
4. QEMU segfaults:

./debian-m68k.sh: line 10:  4420 Segmentation fault      (core dumped) qemu-system-m68k -boot c -M q800 -serial none -serial mon:stdio -m 1000M -net nic,model=dp83932,addr=08:00:07:12:34:89 -net user -append "root=/dev/sda2 rw console=ttyS0 console=tty" -kernel virt/vmlinux-4.16.0-1-m68k -initrd virt/initrd.img-4.16.0-1-m68k -drive file=virt/debian-m68k-deb10.qcow2,format=qcow2 -nographic

Additional information