esp-idf/components/esp_system/port/panic_handler_asm.S
2020-03-10 19:56:24 +08:00

64 lines
2.0 KiB
ArmAsm

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