116 lines
2.7 KiB
ArmAsm
116 lines
2.7 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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* 2018/10/28 Bernard The unify RISC-V porting implementation
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* 2018/12/27 Jesven Add SMP support
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* 2021/02/02 lizhirui Add userspace support
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* 2022/10/22 Shell Support User mode RVV;
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* Trimming process switch context
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*/
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#include "cpuport.h"
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#include "stackframe.h"
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#define _REG_IDX(name) RT_HW_SWITCH_CONTEXT_##name
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#define REG_IDX(name) _REG_IDX(name)
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.macro SAVE_REG reg, index
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STORE \reg, \index*REGBYTES(sp)
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.endm
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.macro LOAD_REG reg, index
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LOAD \reg, \index*REGBYTES(sp)
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.endm
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.macro RESERVE_CONTEXT
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addi sp, sp, -(RT_HW_SWITCH_CONTEXT_SIZE * REGBYTES)
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SAVE_REG tp, REG_IDX(TP)
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SAVE_REG ra, REG_IDX(RA)
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SAVE_REG s0, REG_IDX(S0)
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SAVE_REG s1, REG_IDX(S1)
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SAVE_REG s2, REG_IDX(S2)
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SAVE_REG s3, REG_IDX(S3)
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SAVE_REG s4, REG_IDX(S4)
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SAVE_REG s5, REG_IDX(S5)
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SAVE_REG s6, REG_IDX(S6)
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SAVE_REG s7, REG_IDX(S7)
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SAVE_REG s8, REG_IDX(S8)
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SAVE_REG s9, REG_IDX(S9)
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SAVE_REG s10, REG_IDX(S10)
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SAVE_REG s11, REG_IDX(S11)
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csrr s11, sstatus
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li s10, (SSTATUS_SPP)
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or s11, s11, s10
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SAVE_REG s11, REG_IDX(SSTATUS)
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.endm
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.macro RESTORE_CONTEXT
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LOAD_REG s11, REG_IDX(SSTATUS)
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csrw sstatus, s11
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LOAD_REG s11, REG_IDX(S11)
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LOAD_REG s10, REG_IDX(S10)
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LOAD_REG s9, REG_IDX(S9)
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LOAD_REG s8, REG_IDX(S8)
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LOAD_REG s7, REG_IDX(S7)
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LOAD_REG s6, REG_IDX(S6)
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LOAD_REG s5, REG_IDX(S5)
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LOAD_REG s4, REG_IDX(S4)
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LOAD_REG s3, REG_IDX(S3)
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LOAD_REG s2, REG_IDX(S2)
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LOAD_REG s1, REG_IDX(S1)
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LOAD_REG s0, REG_IDX(S0)
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LOAD_REG ra, REG_IDX(RA)
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LOAD_REG tp, REG_IDX(TP)
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addi sp, sp, RT_HW_SWITCH_CONTEXT_SIZE * REGBYTES
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csrw sepc, ra
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.endm
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/*
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* void rt_hw_context_switch_to(rt_ubase_t to);
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*
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* a0 --> to SP pointer
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*/
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.globl rt_hw_context_switch_to
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rt_hw_context_switch_to:
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LOAD sp, (a0)
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jal rt_thread_self
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mv s1, a0
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#ifdef RT_USING_SMART
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jal lwp_aspace_switch
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#endif
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RESTORE_CONTEXT
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sret
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/*
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* void rt_hw_context_switch(rt_ubase_t from, rt_ubase_t to);
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*
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* a0 --> from SP pointer
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* a1 --> to SP pointer
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*
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* It should only be used on local interrupt disable
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*/
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.globl rt_hw_context_switch
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rt_hw_context_switch:
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RESERVE_CONTEXT
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STORE sp, (a0)
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// restore to thread SP
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LOAD sp, (a1)
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// restore Address Space
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jal rt_thread_self
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mv s1, a0
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#ifdef RT_USING_SMART
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jal lwp_aspace_switch
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#endif
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RESTORE_CONTEXT
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sret
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