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arch: xtensa: Print backtrace from panic handler

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This change uses stack frame to print backtrace once exception occurs
Printing backtrace helps to identify the cause of exception

Signed-off-by: Shubham Kulkarni <shubham.kulkarni@espressif.com>
This commit is contained in:
Shubham Kulkarni 2021-01-07 11:41:11 +05:30 • committed by Anas Nashif
commit 8b7da334d5
8 changed files with 292 additions and 1 deletions
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2
arch/xtensa/include/xtensa-asm2-s.h
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@ -110,6 +110,8 @@
rsr.LCOUNT a0
s32i a0, a1, BSA_LCOUNT_OFF
#endif
rsr.exccause a0
s32i a0, a1, BSA_EXCCAUSE_OFF
#if XCHAL_HAVE_S32C1I
rsr.SCOMPARE1 a0
s32i a0, a1, BSA_SCOMPARE1_OFF