rt-thread-official/libcpu/risc-v/k210/interrupt_gcc.S

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/*
* Copyright (c) 2006-2018, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2018/10/02 Bernard The first version
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* 2018/12/27 Jesven Add SMP schedule
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*/
#include "cpuport.h"
.section .text.entry
.align 2
.global trap_entry
trap_entry:
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#ifdef ARCH_RISCV_FPU
addi sp, sp, -32 * FREGBYTES
FSTORE f0, 0 * FREGBYTES(sp)
FSTORE f1, 1 * FREGBYTES(sp)
FSTORE f2, 2 * FREGBYTES(sp)
FSTORE f3, 3 * FREGBYTES(sp)
FSTORE f4, 4 * FREGBYTES(sp)
FSTORE f5, 5 * FREGBYTES(sp)
FSTORE f6, 6 * FREGBYTES(sp)
FSTORE f7, 7 * FREGBYTES(sp)
FSTORE f8, 8 * FREGBYTES(sp)
FSTORE f9, 9 * FREGBYTES(sp)
FSTORE f10, 10 * FREGBYTES(sp)
FSTORE f11, 11 * FREGBYTES(sp)
FSTORE f12, 12 * FREGBYTES(sp)
FSTORE f13, 13 * FREGBYTES(sp)
FSTORE f14, 14 * FREGBYTES(sp)
FSTORE f15, 15 * FREGBYTES(sp)
FSTORE f16, 16 * FREGBYTES(sp)
FSTORE f17, 17 * FREGBYTES(sp)
FSTORE f18, 18 * FREGBYTES(sp)
FSTORE f19, 19 * FREGBYTES(sp)
FSTORE f20, 20 * FREGBYTES(sp)
FSTORE f21, 21 * FREGBYTES(sp)
FSTORE f22, 22 * FREGBYTES(sp)
FSTORE f23, 23 * FREGBYTES(sp)
FSTORE f24, 24 * FREGBYTES(sp)
FSTORE f25, 25 * FREGBYTES(sp)
FSTORE f26, 26 * FREGBYTES(sp)
FSTORE f27, 27 * FREGBYTES(sp)
FSTORE f28, 28 * FREGBYTES(sp)
FSTORE f29, 29 * FREGBYTES(sp)
FSTORE f30, 30 * FREGBYTES(sp)
FSTORE f31, 31 * FREGBYTES(sp)
#endif
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/* save thread context to thread stack */
addi sp, sp, -32 * REGBYTES
STORE x1, 1 * REGBYTES(sp)
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csrr x1, mstatus
STORE x1, 2 * REGBYTES(sp)
csrr x1, mepc
STORE x1, 0 * REGBYTES(sp)
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STORE x4, 4 * REGBYTES(sp)
STORE x5, 5 * REGBYTES(sp)
STORE x6, 6 * REGBYTES(sp)
STORE x7, 7 * REGBYTES(sp)
STORE x8, 8 * REGBYTES(sp)
STORE x9, 9 * REGBYTES(sp)
STORE x10, 10 * REGBYTES(sp)
STORE x11, 11 * REGBYTES(sp)
STORE x12, 12 * REGBYTES(sp)
STORE x13, 13 * REGBYTES(sp)
STORE x14, 14 * REGBYTES(sp)
STORE x15, 15 * REGBYTES(sp)
STORE x16, 16 * REGBYTES(sp)
STORE x17, 17 * REGBYTES(sp)
STORE x18, 18 * REGBYTES(sp)
STORE x19, 19 * REGBYTES(sp)
STORE x20, 20 * REGBYTES(sp)
STORE x21, 21 * REGBYTES(sp)
STORE x22, 22 * REGBYTES(sp)
STORE x23, 23 * REGBYTES(sp)
STORE x24, 24 * REGBYTES(sp)
STORE x25, 25 * REGBYTES(sp)
STORE x26, 26 * REGBYTES(sp)
STORE x27, 27 * REGBYTES(sp)
STORE x28, 28 * REGBYTES(sp)
STORE x29, 29 * REGBYTES(sp)
STORE x30, 30 * REGBYTES(sp)
STORE x31, 31 * REGBYTES(sp)
/* switch to interrupt stack */
move s0, sp
/* get cpu id */
csrr t0, mhartid
/* switch interrupt stack of current cpu */
la sp, __stack_start__
addi t1, t0, 1
li t2, __STACKSIZE__
mul t1, t1, t2
add sp, sp, t1 /* sp = (cpuid + 1) * __STACKSIZE__ + __stack_start__ */
/* handle interrupt */
call rt_interrupt_enter
csrr a0, mcause
csrr a1, mepc
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mv a2, s0
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call handle_trap
call rt_interrupt_leave
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#ifdef RT_USING_SMP
/* s0 --> sp */
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mv sp, s0
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mv a0, s0
call rt_scheduler_do_irq_switch
tail rt_hw_context_switch_exit
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#else
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/* switch to from_thread stack */
move sp, s0
/* need to switch new thread */
la s0, rt_thread_switch_interrupt_flag
lw s2, 0(s0)
beqz s2, spurious_interrupt
sw zero, 0(s0)
la s0, rt_interrupt_from_thread
LOAD s1, 0(s0)
STORE sp, 0(s1)
la s0, rt_interrupt_to_thread
LOAD s1, 0(s0)
LOAD sp, 0(s1)
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#endif
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spurious_interrupt:
tail rt_hw_context_switch_exit