146 lines
2.6 KiB
ArmAsm
146 lines
2.6 KiB
ArmAsm
/*
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* Copyright (c) 2006-2021, 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 WangXiaoyao 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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.macro PUSH_8 reg
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addi sp, sp, -REGBYTES
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STORE \reg, (sp)
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.endm
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.macro POP_8 reg
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LOAD \reg, (sp)
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addi sp, sp, REGBYTES
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.endm
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.macro RESERVE_CONTEXT
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PUSH_8 tp
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PUSH_8 ra
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PUSH_8 s0
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PUSH_8 s1
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PUSH_8 s2
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PUSH_8 s3
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PUSH_8 s4
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PUSH_8 s5
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PUSH_8 s6
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PUSH_8 s7
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PUSH_8 s8
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PUSH_8 s9
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PUSH_8 s10
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PUSH_8 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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PUSH_8 s11
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addi sp, sp, -REGBYTES
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.endm
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.macro RESTORE_CONTEXT
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addi sp, sp, REGBYTES
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POP_8 s11
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csrw sstatus, s11
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POP_8 s11
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POP_8 s10
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POP_8 s9
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POP_8 s8
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POP_8 s7
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POP_8 s6
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POP_8 s5
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POP_8 s4
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POP_8 s3
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POP_8 s2
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POP_8 s1
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POP_8 s0
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POP_8 ra
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POP_8 tp
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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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#ifdef ENABLE_VECTOR
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/**
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* @param a0 pointer to frame bottom
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*/
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.global rt_hw_vector_ctx_save
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rt_hw_vector_ctx_save:
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SAVE_VECTOR a0
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ret
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/**
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* @param a0 pointer to frame bottom
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*/
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.global rt_hw_vector_ctx_restore
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rt_hw_vector_ctx_restore:
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RESTORE_VECTOR a0
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ret
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.global rt_hw_disable_vector
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rt_hw_disable_vector:
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li t0, SSTATUS_VS
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csrc sstatus, t0
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ret
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.global rt_hw_enable_vector
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rt_hw_enable_vector:
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li t0, SSTATUS_VS
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csrs sstatus, t0
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ret
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#endif /* ENABLE_VECTOR */
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