forked from xuos/xiuos
transplant development board of gd32vf103_rvstar
This commit is contained in:
Wang_Weigen
@@ -0,0 +1,232 @@
|
||||
/*
|
||||
* Copyright (c) 2019 Nuclei Limited. All rights reserved.
|
||||
*
|
||||
* SPDX-License-Identifier: Apache-2.0
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the License); you may
|
||||
* not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an AS IS BASIS, WITHOUT
|
||||
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
/******************************************************************************
|
||||
* \file intexc_gd32vf103.S
|
||||
* \brief NMSIS Interrupt and Exception Handling Template File
|
||||
* for Device gd32vf103
|
||||
* \version V1.00
|
||||
* \date 7 Jan 2020
|
||||
*
|
||||
******************************************************************************/
|
||||
|
||||
#include "riscv_encoding.h"
|
||||
|
||||
/**
|
||||
* \brief Global interrupt disabled
|
||||
* \details
|
||||
* This function disable global interrupt.
|
||||
* \remarks
|
||||
* - All the interrupt requests will be ignored by CPU.
|
||||
*/
|
||||
.macro DISABLE_MIE
|
||||
csrc CSR_MSTATUS, MSTATUS_MIE
|
||||
.endm
|
||||
|
||||
/**
|
||||
* \brief Macro for context save
|
||||
* \details
|
||||
* This macro save ABI defined caller saved registers in the stack.
|
||||
* \remarks
|
||||
* - This Macro could use to save context when you enter to interrupt
|
||||
* or exception
|
||||
*/
|
||||
/* Save caller registers */
|
||||
.macro SAVE_CONTEXT
|
||||
/* Allocate stack space for context saving */
|
||||
#ifndef __riscv_32e
|
||||
addi sp, sp, -20*REGBYTES
|
||||
#else
|
||||
addi sp, sp, -14*REGBYTES
|
||||
#endif /* __riscv_32e */
|
||||
|
||||
STORE x1, 0*REGBYTES(sp)
|
||||
STORE x4, 1*REGBYTES(sp)
|
||||
STORE x5, 2*REGBYTES(sp)
|
||||
STORE x6, 3*REGBYTES(sp)
|
||||
STORE x7, 4*REGBYTES(sp)
|
||||
STORE x10, 5*REGBYTES(sp)
|
||||
STORE x11, 6*REGBYTES(sp)
|
||||
STORE x12, 7*REGBYTES(sp)
|
||||
STORE x13, 8*REGBYTES(sp)
|
||||
STORE x14, 9*REGBYTES(sp)
|
||||
STORE x15, 10*REGBYTES(sp)
|
||||
#ifndef __riscv_32e
|
||||
STORE x16, 14*REGBYTES(sp)
|
||||
STORE x17, 15*REGBYTES(sp)
|
||||
STORE x28, 16*REGBYTES(sp)
|
||||
STORE x29, 17*REGBYTES(sp)
|
||||
STORE x30, 18*REGBYTES(sp)
|
||||
STORE x31, 19*REGBYTES(sp)
|
||||
#endif /* __riscv_32e */
|
||||
.endm
|
||||
|
||||
/**
|
||||
* \brief Macro for restore caller registers
|
||||
* \details
|
||||
* This macro restore ABI defined caller saved registers from stack.
|
||||
* \remarks
|
||||
* - You could use this macro to restore context before you want return
|
||||
* from interrupt or exeception
|
||||
*/
|
||||
/* Restore caller registers */
|
||||
.macro RESTORE_CONTEXT
|
||||
LOAD x1, 0*REGBYTES(sp)
|
||||
LOAD x4, 1*REGBYTES(sp)
|
||||
LOAD x5, 2*REGBYTES(sp)
|
||||
LOAD x6, 3*REGBYTES(sp)
|
||||
LOAD x7, 4*REGBYTES(sp)
|
||||
LOAD x10, 5*REGBYTES(sp)
|
||||
LOAD x11, 6*REGBYTES(sp)
|
||||
LOAD x12, 7*REGBYTES(sp)
|
||||
LOAD x13, 8*REGBYTES(sp)
|
||||
LOAD x14, 9*REGBYTES(sp)
|
||||
LOAD x15, 10*REGBYTES(sp)
|
||||
#ifndef __riscv_32e
|
||||
LOAD x16, 14*REGBYTES(sp)
|
||||
LOAD x17, 15*REGBYTES(sp)
|
||||
LOAD x28, 16*REGBYTES(sp)
|
||||
LOAD x29, 17*REGBYTES(sp)
|
||||
LOAD x30, 18*REGBYTES(sp)
|
||||
LOAD x31, 19*REGBYTES(sp)
|
||||
|
||||
/* De-allocate the stack space */
|
||||
addi sp, sp, 20*REGBYTES
|
||||
#else
|
||||
/* De-allocate the stack space */
|
||||
addi sp, sp, 14*REGBYTES
|
||||
#endif /* __riscv_32e */
|
||||
|
||||
.endm
|
||||
|
||||
/**
|
||||
* \brief Macro for save necessary CSRs to stack
|
||||
* \details
|
||||
* This macro store MCAUSE, MEPC, MSUBM to stack.
|
||||
*/
|
||||
.macro SAVE_CSR_CONTEXT
|
||||
/* Store CSR mcause to stack using pushmcause */
|
||||
csrrwi x0, CSR_PUSHMCAUSE, 11
|
||||
/* Store CSR mepc to stack using pushmepc */
|
||||
csrrwi x0, CSR_PUSHMEPC, 12
|
||||
/* Store CSR msub to stack using pushmsub */
|
||||
csrrwi x0, CSR_PUSHMSUBM, 13
|
||||
.endm
|
||||
|
||||
/**
|
||||
* \brief Macro for restore necessary CSRs from stack
|
||||
* \details
|
||||
* This macro restore MSUBM, MEPC, MCAUSE from stack.
|
||||
*/
|
||||
.macro RESTORE_CSR_CONTEXT
|
||||
LOAD x5, 13*REGBYTES(sp)
|
||||
csrw CSR_MSUBM, x5
|
||||
LOAD x5, 12*REGBYTES(sp)
|
||||
csrw CSR_MEPC, x5
|
||||
LOAD x5, 11*REGBYTES(sp)
|
||||
csrw CSR_MCAUSE, x5
|
||||
.endm
|
||||
|
||||
/**
|
||||
* \brief Exception/NMI Entry
|
||||
* \details
|
||||
* This function provide common entry functions for exception/nmi.
|
||||
* \remarks
|
||||
* This function provide a default exception/nmi entry.
|
||||
* ABI defined caller save register and some CSR registers
|
||||
* to be saved before enter interrupt handler and be restored before return.
|
||||
*/
|
||||
.section .text.trap
|
||||
/* In CLIC mode, the exeception entry must be 64bytes aligned */
|
||||
.align 6
|
||||
.global exc_entry
|
||||
.weak exc_entry
|
||||
exc_entry:
|
||||
/* Save the caller saving registers (context) */
|
||||
SAVE_CONTEXT
|
||||
/* Save the necessary CSR registers */
|
||||
SAVE_CSR_CONTEXT
|
||||
|
||||
/*
|
||||
* Set the exception handler function arguments
|
||||
* argument 1: mcause value
|
||||
* argument 2: current stack point(SP) value
|
||||
*/
|
||||
csrr a0, mcause
|
||||
mv a1, sp
|
||||
/*
|
||||
* TODO: Call the exception handler function
|
||||
* By default, the function template is provided in
|
||||
* system_Device.c, you can adjust it as you want
|
||||
*/
|
||||
call core_exception_handler
|
||||
|
||||
/* Restore the necessary CSR registers */
|
||||
RESTORE_CSR_CONTEXT
|
||||
/* Restore the caller saving registers (context) */
|
||||
RESTORE_CONTEXT
|
||||
|
||||
/* Return to regular code */
|
||||
mret
|
||||
|
||||
/**
|
||||
* \brief Non-Vector Interrupt Entry
|
||||
* \details
|
||||
* This function provide common entry functions for handling
|
||||
* non-vector interrupts
|
||||
* \remarks
|
||||
* This function provide a default non-vector interrupt entry.
|
||||
* ABI defined caller save register and some CSR registers need
|
||||
* to be saved before enter interrupt handler and be restored before return.
|
||||
*/
|
||||
.section .text.irq
|
||||
/* In CLIC mode, the interrupt entry must be 4bytes aligned */
|
||||
.align 2
|
||||
.global irq_entry
|
||||
.weak irq_entry
|
||||
/* This label will be set to MTVT2 register */
|
||||
irq_entry:
|
||||
/* Save the caller saving registers (context) */
|
||||
SAVE_CONTEXT
|
||||
/* Save the necessary CSR registers */
|
||||
SAVE_CSR_CONTEXT
|
||||
|
||||
/* This special CSR read/write operation, which is actually
|
||||
* claim the CLIC to find its pending highest ID, if the ID
|
||||
* is not 0, then automatically enable the mstatus.MIE, and
|
||||
* jump to its vector-entry-label, and update the link register
|
||||
*/
|
||||
csrrw ra, CSR_JALMNXTI, ra
|
||||
|
||||
/* Critical section with interrupts disabled */
|
||||
DISABLE_MIE
|
||||
|
||||
/* Restore the necessary CSR registers */
|
||||
RESTORE_CSR_CONTEXT
|
||||
/* Restore the caller saving registers (context) */
|
||||
RESTORE_CONTEXT
|
||||
|
||||
/* Return to regular code */
|
||||
mret
|
||||
|
||||
/* Default Handler for Exceptions / Interrupts */
|
||||
.global default_intexc_handler
|
||||
.weak default_intexc_handler
|
||||
Undef_Handler:
|
||||
default_intexc_handler:
|
||||
1:
|
||||
j 1b
|
||||
Reference in New Issue
Block a user