Crash issue of qemu about avatar2-examples HOT 1 OPEN

Hello,

Thank for reporting these issues, I confirm I can reproduce them.

About the nucleo_L152RE, it looks like during the transfer_state() the CPSR register is not properly synchronized within the emulator which leads to an inconsistent state and the bug you see.

$ cat QemuTarget0_err.txt 
qemu: fatal: Lockup: can't take terminal derived exception (original exception priority -1)

R00=20000590 R01=20014000 R02=00000001 R03=00000001
R04=00000000 R05=00000000 R06=00000000 R07=080063c7
R08=00000000 R09=00000000 R10=080063e8 R11=080063e8
R12=00000001 R13=20013fe0 R14=0800026f R15=08002cac
XPSR=40000000 -Z-- A priv-thread
FPSCR: 00000000

While waiting for a fix, you can replace the QemuTarget with PandaTarget within the example, it should work correctly.

For the u-boot example, the issue seems to be related to the versatilepb board used by the target_runner between versions 4.2 and 5.1. Even vanilla QEMU is affected.
In the meantime we find the exact cause, you can use a different QEMU version < 4.2 for the target_runner by editing the executable path at line 34 but keep avatar-qemu for the QemuTarget.

from avatar2-examples.