93 lines
1.9 KiB
ArmAsm
93 lines
1.9 KiB
ArmAsm
/*
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* Copyright (c) 2020-2020, BLUETRUM Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "ab32vg1.h"
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.global _start
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.section .reset, "ax"
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_start:
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//load comm
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la a0, __comm_vma
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la a1, __comm_lma
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la a2, __comm_size
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/* memcpy start */
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//先按32 BYTE一个循环来copy
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mv t0, a0 //备份dst
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srli t1, a2, 5 //长度除32的商
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slli t1, t1, 5
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add t1, a0, t1 //t1存放对齐的结束地址
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_memcpy_loop1: //8 WORDS every cycle
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lw a2, 0(a1)
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lw a3, 4(a1)
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lw a4, 8(a1)
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lw a5, 12(a1)
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sw a2, 0(a0)
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sw a3, 4(a0)
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sw a4, 8(a0)
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sw a5, 12(a0)
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lw a2, 16(a1)
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lw a3, 20(a1)
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lw a4, 24(a1)
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lw a5, 28(a1)
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sw a2, 16(a0)
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sw a3, 20(a0)
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sw a4, 24(a0)
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sw a5, 28(a0)
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addi a0, a0, 32
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addi a1, a1, 32
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blt a0, t1, _memcpy_loop1
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mv a0, t0 //返回dst
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/* memcpy end */
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la a0, __irq_stack_start //Stack清成0x23
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li a1, 0x23
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la a2, __irq_stack_size
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call memset
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la ra, __irq_stack
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lui a5, 0x1
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sw zero, -1920(a5)
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sw zero, -1916(a5)
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//clear bss
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la a0, __bss_start
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li a1, 0
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la a2, __bss_size
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call memset
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la a0, __comm_vma
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sw a0, PICADR(zero)
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call entry
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// la ra, __exception
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// jr ra
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.section .vector, "ax"
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// .org 0x10
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//__exception:
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// li sp, 0x10600 //出错后，不破坏错误点的堆栈数据
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// jal exception_isr
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// 1: j 1b
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// mret
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.org 0x40
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jal x0, low_prio_irq
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mret
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.global cpu_irq_comm
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.section .com_text.irq
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cpu_irq_comm:
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la a5, __irq_stack
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mv sp, a5
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j cpu_irq_comm_do
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ret
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