rt-thread-official/libcpu/unicore32/sep6200/context_gcc.S

/*
 * Copyright (c) 2006-2022, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2013-7-14      Peng Fan     sep6200 implementation
 */

/**
 * \addtogroup sep6200
 */

/*@{*/

#define NOINT           0xc0

/*
 * rt_base_t rt_hw_interrupt_disable();
 */
.globl rt_hw_interrupt_disable
.type rt_hw_interrupt_disable, %function
rt_hw_interrupt_disable:
  stw.w   r1, [sp-], #4
    mov     r0, asr
    or      r1, r0, #NOINT
    mov.a   asr, r1
  ldw.w   r1, [sp]+, #4
    mov     pc, lr

/*
 * void rt_hw_interrupt_enable(rt_base_t level);
 */
.globl rt_hw_interrupt_enable
.type rt_hw_interrupt_disable, %function
rt_hw_interrupt_enable:
    mov.a asr, r0
    mov pc, lr

/*
 * void rt_hw_context_switch(rt_uint32 from, rt_uint32 to);
 * r0 --> from
 * r1 --> to
 */
.globl rt_hw_context_switch
.type rt_hw_interrupt_disable, %function
rt_hw_context_switch:
    stm.w   (lr), [sp-]
    stm.w   (r16, r17, r18, r19, r20, r21, r22, r23, r24, r25, r26, r27, r28, lr), [sp-]
    stm.w   (r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, r13, r14, r15),  [sp-]
    mov r4, asr
    stm.w   (r4), [sp-]
    mov     r4, bsr
    stm.w   (r4), [sp-]

    stw sp, [r0+]
    ldw sp, [r1+]

    ldm.w   (r4), [sp]+
    mov.a   bsr,r4
    ldm.w   (r4), [sp]+
    mov.a   asr, r4

    ldm.w   (r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, r13, r14, r15), [sp]+
    ldm.w   (r16, r17, r18, r19, r20, r21, r22, r23, r24, r25, r26, r27, r28, lr, pc), [sp]+

/*
 * void rt_hw_context_switch_to(rt_uint32 to);
 * r0 --> to
 */
.globl rt_hw_context_switch_to
rt_hw_context_switch_to:
    ldw sp, [r0+]
    ldm.w   (r4), [sp]+
    mov.a   bsr, r4
    ldm.w   (r4), [sp]+
    mov.a   asr, r4
    ldm.w   (r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, r13, r14, r15), [sp]+
    ldm.w   (r16, r17, r18, r19, r20, r21, r22, r23, r24, r25, r26, r27, r28, lr, pc), [sp]+

/*
 * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
 */
.globl rt_thread_switch_interrupt_flag
.globl rt_interrupt_from_thread
.globl rt_interrupt_to_thread
.globl rt_hw_context_switch_interrupt
rt_hw_context_switch_interrupt:
    ldw r2, =rt_thread_switch_interrupt_flag
    ldw r3, [r2+]
    cmpsub.a r3, #1
    beq _reswitch
    mov r3, #1
    stw r3, [r2+]
    ldw r2, =rt_interrupt_from_thread
    stw r0, [r2+]
_reswitch:
    ldw r2, =rt_interrupt_to_thread
    stw r1, [r2+]
    mov pc, lr