MNRS-BM-BSP/env/start.S

#include "encoding.h"
// See LICENSE for license details.

	.section .init
	.globl _start
	.type _start,@function

_start:
.option push
.option norelax
.option norvc
	j 1f
	.2byte	0x4e4d
	.2byte	0x5352
	.4byte  0x669
1:
    la gp, __global_pointer$
.option pop
	la sp, _sp
    la t0, trap_entry
    csrw mtvec, t0
	/* Load data section */
	la a0, _data_lma
	la a1, _data
	la a2, _edata
	bgeu a1, a2, 2f
1:
	lw t0, (a0)
	addi a0, a0, 4
	sw t0, (a1)
	addi a1, a1, 4
	bltu a1, a2, 1b
2:

	/* Clear bss section */
	la a0, __bss_start
	la a1, _end
	bgeu a0, a1, 2f
1:
	sw zero, (a0)
	addi a0, a0, 4
	bltu a0, a1, 1b
2:

	/* Call global constructors */
#ifndef HAVE_NO_INIT_FINI
	la a0, __libc_fini_array
	call atexit
	call __libc_init_array
#endif
#ifndef __riscv_float_abi_soft
	/* Enable FPU */
	li t0, MSTATUS_FS
	csrs mstatus, t0
	csrr t1, mstatus
	and t1, t1, t0
	beqz t1, 1f
	fssr x0
1:
#endif

	/* argc = argv = 0 */
	li a0, 0
	li a1, 0
	call main
	tail _exit