42 lines
706 B
ArmAsm
42 lines
706 B
ArmAsm
// See LICENSE for license details.
|
|
|
|
#include "riscv_encoding.h"
|
|
|
|
.section .text.entry
|
|
.globl _start
|
|
.type _start,@function
|
|
_start:
|
|
csrc mstatus, MSTATUS_MIE
|
|
csrw mie, 0
|
|
|
|
la t0, trap_entry
|
|
csrw mtvec, t0
|
|
|
|
la sp, _stack_top
|
|
|
|
/* Load data section */
|
|
la a0, _load_data
|
|
la a1, _data
|
|
la a2, _edata
|
|
bgeu a1, a2, begin_clear_bss
|
|
clear_data:
|
|
lw t0, (a0)
|
|
sw t0, (a1)
|
|
addi a0, a0, 4
|
|
addi a1, a1, 4
|
|
bltu a1, a2, clear_data
|
|
|
|
begin_clear_bss:
|
|
// clear bss section
|
|
la a0, _bss
|
|
la a1, _ebss
|
|
bgeu a0, a1, init_finish
|
|
clear_bss:
|
|
sw zero, (a0)
|
|
addi a0, a0, 4
|
|
bltu a0, a1, clear_bss
|
|
init_finish:
|
|
call main
|
|
__die:
|
|
j __die
|