eb001/tb/sw/src/slvStartup.S

#include "tl2cdr.h"

.extern main
.extern plic_handle
.extern int_svr_code
.extern plic_claim
.extern flag_intTxEnd
.extern flag_intRxError
.extern flag_intRxStart
.extern flag_intRxEnd

.globl _prog_start
.section .text.init


_prog_start:



	li x1,  0
	li x2,  0
	li x3,  0
	li x4,  0
	li x5,  0
	li x6,  0
	li x7,  0
	li x8,  0
	li x9,  0
	li x10, 0
	li x11, 0
	li x12, 0
	li x13, 0
	li x14, 0
	li x15, 0
#ifdef __RV32I_MARCH__
	li x16, 0
	li x17, 0
	li x18, 0
	li x19, 0
	li x20, 0
	li x21, 0
	li x22, 0
	li x23, 0
	li x24, 0
	li x25, 0
	li x26, 0
	li x27, 0
	li x28, 0
	li x29, 0
	li x30, 0
	li x31, 0
#endif
	li sp, 0x40011000

	lui t0, %hi(plic_claim)
	lw 	a0, %lo(plic_claim)(t0)


	la a1, flag_intTxEnd
	la a2, flag_intRxError
	la a3, flag_intRxStart
	la a4, flag_intRxEnd
	
	call int_svr_code
	mv t0, a0					#这里选择不同的trap_entry服务函数,这个是RV32I的代码

	#la t0, trap_entry			#这个是最初版的trap_entry，仅做了RV32E的改造
	csrw mtvec, t0
	li t0, 1 << 11
	csrw mie, t0

	csrr t0, mstatus
	ori t0, t0, 1<<3
	csrw mstatus, t0

	call main

	ecall



.balign 32
.section .trap_entry, "ax", %progbits
trap_entry:

	addi	sp,sp,-136
	sw	ra,4(sp)
	sw	sp,8(sp)
	sw	gp,12(sp)
	sw	tp,16(sp)
	sw	t0,20(sp)
	sw	t1,24(sp)
	sw	t2,28(sp)
	sw	s0,32(sp)
	sw	s1,36(sp)
	sw	a0,40(sp)
	sw	a1,44(sp)
	sw	a2,48(sp)
	sw	a3,52(sp)
	sw	a4,56(sp)
	sw	a5,60(sp)
#ifdef __RV32I_MARCH__
	sw	a6,64(sp)
	sw	a7,68(sp)
	sw	s2,72(sp)
	sw	s3,76(sp)
	sw	s4,80(sp)
	sw	s5,84(sp)
	sw	s6,88(sp)
	sw	s7,92(sp)
	sw	s8,96(sp)
	sw	s9,100(sp)
	sw	s10,104(sp)
	sw	s11,108(sp)
	sw	t3,112(sp)
	sw	t4,116(sp)
	sw	t5,120(sp)
	sw	t6,124(sp)
#endif

	call plic_handle

	lw	ra,4(sp)
	lw	sp,8(sp)
	lw	gp,12(sp)
	lw	tp,16(sp)
	lw	t0,20(sp)
	lw	t1,24(sp)
	lw	t2,28(sp)
	lw	s0,32(sp)
	lw	s1,36(sp)
	lw	a0,40(sp)
	lw	a1,44(sp)
	lw	a2,48(sp)
	lw	a3,52(sp)
	lw	a4,56(sp)
	lw	a5,60(sp)
#ifdef __RV32I_MARCH__
	lw	a6,64(sp)
	lw	a7,68(sp)
	lw	s2,72(sp)
	lw	s3,76(sp)
	lw	s4,80(sp)
	lw	s5,84(sp)
	lw	s6,88(sp)
	lw	s7,92(sp)
	lw	s8,96(sp)
	lw	s9,100(sp)
	lw	s10,104(sp)
	lw	s11,108(sp)
	lw	t3,112(sp)
	lw	t4,116(sp)
	lw	t5,120(sp)
	lw	t6,124(sp)
#endif
	addi	sp,sp,136



	mret