2026-05-22 18:13:11 +08:00
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.section .text.SW_Handler,"ax",@progbits
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.global SW_Handler
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.p2align 2 /* 4 bytes align */
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.func
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SW_Handler:
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/* save all from thread context */
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addi sp, sp, -32 * 4
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2026-05-22 20:53:29 +08:00
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sw t0, 5 * 4(sp) /* 保存 t0, 后面要使用这个寄存器 */
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2026-05-22 20:53:29 +08:00
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li t0, 0x80 /* 读取 mstatus */
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sw t0, 2 * 4(sp) /* 保存到 x2 位置 */
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2026-05-22 20:53:29 +08:00
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li t0, 0x1800 /* 关闭中断，并进入 M-Mode 模式 */
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2026-05-22 18:13:11 +08:00
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csrw mstatus, t0
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sw x1, 1 * 4(sp) /* return address */
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sw x4, 4 * 4(sp) /* tp */
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sw x6, 6 * 4(sp)
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sw x7, 7 * 4(sp)
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sw x8, 8 * 4(sp)
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sw x9, 9 * 4(sp)
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sw x10, 10 * 4(sp)
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sw x11, 11 * 4(sp)
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sw x12, 12 * 4(sp)
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sw x13, 13 * 4(sp)
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sw x14, 14 * 4(sp)
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sw x15, 15 * 4(sp)
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sw x16, 16 * 4(sp)
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sw x17, 17 * 4(sp)
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sw x18, 18 * 4(sp)
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sw x19, 19 * 4(sp)
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sw x20, 20 * 4(sp)
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sw x21, 21 * 4(sp)
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sw x22, 22 * 4(sp)
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sw x23, 23 * 4(sp)
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sw x24, 24 * 4(sp)
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sw x25, 25 * 4(sp)
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sw x26, 26 * 4(sp)
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sw x27, 27 * 4(sp)
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sw x28, 28 * 4(sp)
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sw x29, 29 * 4(sp)
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sw x30, 30 * 4(sp)
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sw x31, 31 * 4(sp)
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2026-05-22 20:53:29 +08:00
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csrr t0, mepc /* 额外保存 mepc 到 x0 位置 */
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sw t0, 0 * 4(sp)
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2026-05-22 18:13:11 +08:00
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la s0, g_os_port_switch_from_sp /* 更新旧任务栈指针 */
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lw s1, 0(s0)
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sw sp, 0(s1)
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/* ---------- 收尾工作 ---------- */
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jal os_port_on_switch_success
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/* ---------- 切换到新任务 ---------- */
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la s0, g_os_port_switch_to_sp /* 加载新任务栈指针 */
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lw s1, 0(s0)
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lw sp, 0(s1)
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lw t0, 0 * 4(sp) /* 恢复 mepc 指针 */
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csrw mepc, t0 /* 将 t0 值写入 mepc */
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lw x1, 1 * 4(sp) /* 加载 return address */
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2026-05-22 20:53:29 +08:00
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li t0, 0x1800
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csrs mstatus, t0
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lw t0, 2*4(sp) /* 将栈里面的 mstatus 恢复 */
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csrs mstatus, t0 /* 设置 MPIE = 1 */
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lw x4, 4 * 4(sp) /* 恢复其它寄存器 */
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lw x5, 5 * 4(sp)
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lw x6, 6 * 4(sp)
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lw x7, 7 * 4(sp)
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lw x8, 8 * 4(sp)
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lw x9, 9 * 4(sp)
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lw x10, 10 * 4(sp)
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lw x11, 11 * 4(sp)
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lw x12, 12 * 4(sp)
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lw x13, 13 * 4(sp)
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lw x14, 14 * 4(sp)
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lw x15, 15 * 4(sp)
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lw x16, 16 * 4(sp)
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lw x17, 17 * 4(sp)
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lw x18, 18 * 4(sp)
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lw x19, 19 * 4(sp)
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lw x20, 20 * 4(sp)
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lw x21, 21 * 4(sp)
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lw x22, 22 * 4(sp)
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lw x23, 23 * 4(sp)
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lw x24, 24 * 4(sp)
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lw x25, 25 * 4(sp)
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lw x26, 26 * 4(sp)
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lw x27, 27 * 4(sp)
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lw x28, 28 * 4(sp)
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lw x29, 29 * 4(sp)
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lw x30, 30 * 4(sp)
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lw x31, 31 * 4(sp)
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addi sp, sp, 32 * 4 /* 出栈 */
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mret
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.endfunc
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/*
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* void os_port_context_restore(os_uintptr_t to);
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* a0 --> to
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* a1 --> to_thread
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*/
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.section .text.os_port_context_restore,"ax",@progbits
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.globl os_port_context_restore
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.func
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.p2align 2 /* 4 bytes align */
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os_port_context_restore:
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/* first save interrupt stack */
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la t0, _eusrstack
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addi t0, t0, -512
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csrw mscratch,t0
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2026-05-22 20:53:29 +08:00
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/* 关闭中断 */
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2026-05-22 18:13:11 +08:00
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li t0, 0x1800
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csrw mstatus, t0
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/* ---------- 收尾工作 ---------- */
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jal os_port_on_switch_success
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/* ---- Load target sp ---- */
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lw sp, (a0) /* 将 to 的指针加载到 sp */
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/* resw ra to mepc */
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lw a0, 0 * 4(sp)
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csrw mepc, a0
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2026-05-22 20:53:29 +08:00
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lw a0, 2*4(sp) /* 恢复 MPIE */
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csrs mstatus, a0
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2026-05-22 18:13:11 +08:00
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lw x1, 1 * 4(sp) /* 返回地址 */
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lw x4, 4 * 4(sp)
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lw x5, 5 * 4(sp)
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lw x6, 6 * 4(sp)
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lw x7, 7 * 4(sp)
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lw x8, 8 * 4(sp)
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lw x9, 9 * 4(sp)
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lw x10, 10 * 4(sp)
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lw x11, 11 * 4(sp)
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lw x12, 12 * 4(sp)
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lw x13, 13 * 4(sp)
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lw x14, 14 * 4(sp)
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lw x15, 15 * 4(sp)
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lw x16, 16 * 4(sp)
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lw x17, 17 * 4(sp)
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lw x18, 18 * 4(sp)
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lw x19, 19 * 4(sp)
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lw x20, 20 * 4(sp)
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lw x21, 21 * 4(sp)
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lw x22, 22 * 4(sp)
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lw x23, 23 * 4(sp)
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lw x24, 24 * 4(sp)
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lw x25, 25 * 4(sp)
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lw x26, 26 * 4(sp)
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lw x27, 27 * 4(sp)
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lw x28, 28 * 4(sp)
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lw x29, 29 * 4(sp)
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lw x30, 30 * 4(sp)
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lw x31, 31 * 4(sp)
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addi sp, sp, 32 * 4
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mret
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.endfunc
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.end
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