136 lines
3.1 KiB
ArmAsm
136 lines
3.1 KiB
ArmAsm
/*
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* Copyright (c) 2006-2024, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2021-05-18 Jesven the first version
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* 2023-06-24 Shell Support backtrace for user thread
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* 2024-01-06 Shell Fix barrier on irq_disable/enable
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* 2024-03-28 Shell Move vector handling codes from context_gcc.S
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*/
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#ifndef __ASSEMBLY__
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#define __ASSEMBLY__
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#endif
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#include "context_gcc.h"
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#include "../include/vector_gcc.h"
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#include <rtconfig.h>
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#include <asm-generic.h>
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#include <asm-fpu.h>
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#include <armv8.h>
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.section .text
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.globl rt_hw_context_switch_to
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/*
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* void rt_hw_context_switch_to(rt_uint3 to, struct rt_thread *to_thread);
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* X0 --> to (thread stack)
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* X1 --> to_thread
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*/
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rt_hw_context_switch_to:
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ldr x0, [x0]
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mov sp, x0
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/* reserved to_thread */
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mov x19, x1
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mov x0, x19
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bl rt_cpus_lock_status_restore
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#ifdef RT_USING_SMART
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mov x0, x19
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bl lwp_user_setting_restore
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#endif
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b _context_switch_exit
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.globl rt_hw_context_switch
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/*
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* void rt_hw_context_switch(rt_uint32 from, rt_uint32
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to, struct rt_thread *to_thread);
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* X0 --> from (from_thread stack)
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* X1 --> to (to_thread stack)
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* X2 --> to_thread
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*/
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rt_hw_context_switch:
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SAVE_CONTEXT_SWITCH x19, x20
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mov x3, sp
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str x3, [x0] // store sp in preempted tasks TCB
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ldr x0, [x1] // get new task stack pointer
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mov sp, x0
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/* backup thread self */
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mov x19, x2
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mov x0, x19
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bl rt_cpus_lock_status_restore
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#ifdef RT_USING_SMART
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mov x0, x19
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bl lwp_user_setting_restore
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#endif
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b _context_switch_exit
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.globl rt_hw_irq_exit
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.globl rt_hw_context_switch_interrupt
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#define EXP_FRAME x19
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#define FROM_SPP x20
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#define TO_SPP x21
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#define TO_TCB x22
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/*
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* void rt_hw_context_switch_interrupt(context, from sp, to sp, tp tcb)
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* X0 :interrupt context
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* X1 :addr of from_thread's sp
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* X2 :addr of to_thread's sp
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* X3 :to_thread's tcb
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*/
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rt_hw_context_switch_interrupt:
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#ifdef RT_USING_DEBUG
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/* debug frame for backtrace */
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stp x29, x30, [sp, #-0x10]!
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#endif /* RT_USING_DEBUG */
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/* we can discard all the previous ABI here */
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mov EXP_FRAME, x0
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mov FROM_SPP, x1
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mov TO_SPP, x2
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mov TO_TCB, x3
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#ifdef RT_USING_SMART
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GET_THREAD_SELF x0
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bl lwp_user_setting_save
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#endif /* RT_USING_SMART */
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/* reset SP of from-thread */
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mov sp, EXP_FRAME
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/* push context for swtich */
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adr lr, rt_hw_irq_exit
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SAVE_CONTEXT_SWITCH_FAST
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/* save SP of from-thread */
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mov x0, sp
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str x0, [FROM_SPP]
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/* setup SP to to-thread's */
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ldr x0, [TO_SPP]
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mov sp, x0
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mov x0, TO_TCB
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bl rt_cpus_lock_status_restore
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#ifdef RT_USING_SMART
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mov x0, TO_TCB
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bl lwp_user_setting_restore
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#endif /* RT_USING_SMART */
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b _context_switch_exit
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_context_switch_exit:
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.local _context_switch_exit
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clrex
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RESTORE_CONTEXT_SWITCH
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