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xtensa: stop execution under simulator for double exception

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If running under Xtensa simulator, it is good to tell simulator
to stop execution once we reach double exception, as the current
double exception handler is simply an endless loop. If we turn
on tracing in the simulator, the output file would contain
an infinite iteration of this endless loop, and the simulator
needs to be stopped manually before the file size goes out of
control. So we need to tell the simulator to stop once
we reach this point instead of doing an endless loop.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This commit is contained in:
Daniel Leung 2023-01-18 11:09:26 -08:00 • committed by Fabio Baltieri
commit db495a5ebe
1 changed files with 15 additions and 1 deletions
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16
arch/xtensa/core/xtensa-asm2-util.S
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@ -7,6 +7,10 @@
#include <offsets.h>
#include <zsr.h>
#if defined(CONFIG_SIMULATOR_XTENSA) || defined(XT_SIMULATOR)
#include <xtensa/simcall.h>
#endif
/*
* xtensa_spill_reg_windows
*
@ -365,7 +369,17 @@ _KernelExceptionVector:
.pushsection .DoubleExceptionVector.text, "ax"
.global _DoubleExceptionVector
_DoubleExceptionVector:
#if XCHAL_HAVE_DEBUG
#if defined(CONFIG_SIMULATOR_XTENSA) || defined(XT_SIMULATOR)
1:
/* Tell simulator to stop executing here, instead of trying to do
* an infinite loop (see below). Greatly help with using tracing in
* simulator so that traces will not have infinite iterations of
* jumps.
*/
movi a3, 1
movi a2, SYS_exit
simcall
#elif XCHAL_HAVE_DEBUG
/* Signals an unhandled double exception */
1: break 1, 4
#else