64 lines
2 KiB
ArmAsm
64 lines
2 KiB
ArmAsm
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#include "freertos/xtensa_rtos.h"
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#include "esp_private/panic_reason.h"
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#include "soc/soc.h"
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#include "sdkconfig.h"
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/*
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--------------------------------------------------------------------------------
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Panic handler.
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Should be reached by call0 (preferable) or jump only. If call0, a0 says where
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from. If on simulator, display panic message and abort, else loop indefinitely.
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--------------------------------------------------------------------------------
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*/
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.section .iram1,"ax"
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.global panicHandler
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.global _xt_panic
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.type _xt_panic,@function
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.align 4
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.literal_position
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.align 4
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_xt_panic:
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/* Allocate exception frame and save minimal context. */
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mov a0, sp
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addi sp, sp, -XT_STK_FRMSZ
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s32i a0, sp, XT_STK_A1
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#if XCHAL_HAVE_WINDOWED
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s32e a0, sp, -12 /* for debug backtrace */
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#endif
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rsr a0, PS /* save interruptee's PS */
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s32i a0, sp, XT_STK_PS
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rsr a0, EPC_1 /* save interruptee's PC */
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s32i a0, sp, XT_STK_PC
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#if XCHAL_HAVE_WINDOWED
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s32e a0, sp, -16 /* for debug backtrace */
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#endif
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s32i a12, sp, XT_STK_A12 /* _xt_context_save requires A12- */
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s32i a13, sp, XT_STK_A13 /* A13 to have already been saved */
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call0 _xt_context_save
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/* Save exc cause and vaddr into exception frame */
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rsr a0, EXCCAUSE
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s32i a0, sp, XT_STK_EXCCAUSE
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rsr a0, EXCVADDR
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s32i a0, sp, XT_STK_EXCVADDR
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/* _xt_context_save seems to save the current a0, but we need the interuptees a0. Fix this. */
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rsr a0, EXCSAVE_1 /* save interruptee's a0 */
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s32i a0, sp, XT_STK_A0
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/* Set up PS for C, disable all interrupts except NMI and debug, and clear EXCM. */
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movi a0, PS_INTLEVEL(5) | PS_UM | PS_WOE
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wsr a0, PS
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//Call panic handler
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mov a6,sp
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call4 panicHandler
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ret
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