esp-idf/components/esp_gdbstub/xtensa/xt_debugexception.S

65 lines
2.1 KiB
ArmAsm
Raw Normal View History

/*
* SPDX-FileCopyrightText: 2020-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <xtensa/coreasm.h>
#include <xtensa/corebits.h>
#include <xtensa/config/system.h>
#include "freertos/xtensa_context.h"
.section .iram1,"ax"
.global _xt_panic_gdbstub
.type _xt_panic_gdbstub,@function
.align 4
.literal_position
.align 4
_xt_panic_gdbstub:
/* Allocate exception frame and save minimal context. */
addi sp, sp, -XT_STK_FRMSZ
s32i a0, sp, XT_STK_EXIT
s32i a0, sp, XT_STK_A0
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
call0 _xt_context_save /* Save full context*/
addi a7, sp, XT_STK_FRMSZ
s32i a7, sp, XT_STK_A1
s32i a12, sp, XT_STK_A12
s32i a13, sp, XT_STK_A13
/* 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 */
/* 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 gdbstub handler
rsr a0,(EPC + XCHAL_DEBUGLEVEL)
s32i a0, sp, XT_STK_PC
mov a6, sp
rsr a9, EPS_6
s32i a9, sp, XT_STK_PS // store PS to the ps place
movi a11, gdbstub_handle_debug_int
callx4 a11 /* Call interrupt handler */
l32i a0, sp, XT_STK_PC
wsr a0,(EPC + XCHAL_DEBUGLEVEL)
call0 _xt_context_restore /* Restore full context*/
l32i a12, sp, XT_STK_A12
l32i a13, sp, XT_STK_A13
l32i a0, sp, XT_STK_EXIT /* Restore return point*/
addi sp, sp, XT_STK_FRMSZ /* Restore SP*/
rfi 6 // Return from high-level interrupt