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qemu_x86: propagate exit reason code to the shell

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This helps distingush between fatal errors if logging isn't
enabled.

As detailed in comments, pass a reason code which controls
the QEMU process' return value.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2020-06-12 13:22:58 -07:00 • committed by Anas Nashif
commit 8920549464
1 changed files with 8 additions and 1 deletions
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9
arch/x86/core/fatal.c
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@ -18,8 +18,15 @@ FUNC_NORETURN void arch_system_halt(unsigned int reason)
/* Causes QEMU to exit. We passed the following on the command line:
* -device isa-debug-exit,iobase=0xf4,iosize=0x04
*
* For any value of the first argument X, the return value of the
* QEMU process is (X * 2) + 1.
*
* It has been observed that if the emulator exits for a triple-fault
* (often due to bad page tables or other CPU structures) it will
* terminate with 0 error code.
*/
sys_out32(0, 0xf4);
sys_out32(reason, 0xf4);
CODE_UNREACHABLE;
}
#endif