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