rt-thread/libcpu/risc-v/e310/start_gcc.S

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;/*
; * File : start_gcc.S
; * This file is part of RT-Thread RTOS
; * COPYRIGHT (C) 2006, RT-Thread Development Team
; *
; * This program is free software; you can redistribute it and/or modify
; * it under the terms of the GNU General Public License as published by
; * the Free Software Foundation; either version 2 of the License, or
; * (at your option) any later version.
; *
; * This program is distributed in the hope that it will be useful,
; * but WITHOUT ANY WARRANTY; without even the implied warranty of
; * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; * GNU General Public License for more details.
; *
; * You should have received a copy of the GNU General Public License along
; * with this program; if not, write to the Free Software Foundation, Inc.,
; * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
; *
; * Change Logs:
; * Date Author Notes
; * 2017-07-16 zhangjun for hifive1
; */
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#include "sifive/smp.h"
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#define CLINT_CTRL_ADDR 0x02000000
.section .init
.globl _start
.type _start,@function
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_start:
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.cfi_startproc
.cfi_undefined ra
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.option push
.option norelax
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la gp, __global_pointer$
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.option pop
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la sp, _sp
/*
*disable all interrupt at startup
*/
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csrrc a5, mstatus, 0xb
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#if defined(ENABLE_SMP)
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smp_pause(t0, t1)
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#endif
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/* Load data section */
la a0, _data_lma
la a1, _data
la a2, _edata
bgeu a1, a2, 2f
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1:
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lw t0, (a0)
sw t0, (a1)
addi a0, a0, 4
addi a1, a1, 4
bltu a1, a2, 1b
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2:
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/* Clear bss section */
la a0, __bss_start
la a1, _end
bgeu a0, a1, 2f
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1:
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sw zero, (a0)
addi a0, a0, 4
bltu a0, a1, 1b
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2:
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/* Call global constructors */
la a0, __libc_fini_array
call atexit
call __libc_init_array
/*call _init directly in rt-thread*/
call _init
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#ifndef __riscv_float_abi_soft
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/* Enable FPU */
li t0, MSTATUS_FS
csrs mstatus, t0
csrr t1, mstatus
and t1, t1, t0
beqz t1, 1f
fssr x0
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1:
#endif
#if defined(ENABLE_SMP)
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smp_resume(t0, t1)
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csrr a0, mhartid
bnez a0, 2f
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#endif
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auipc ra, 0
addi sp, sp, -16
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#if __riscv_xlen == 32
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sw ra, 8(sp)
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#else
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sd ra, 8(sp)
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#endif
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/* argc = argv = 0 */
li a0, 0
li a1, 0
call main
tail exit
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1:
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j 1b
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#if defined(ENABLE_SMP)
2:
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la t0, trap_entry
csrw mtvec, t0
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csrr a0, mhartid
la t1, _sp
slli t0, a0, 10
sub sp, t1, t0
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auipc ra, 0
addi sp, sp, -16
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#if __riscv_xlen == 32
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sw ra, 8(sp)
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#else
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sd ra, 8(sp)
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#endif
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call secondary_main
tail exit
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1:
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j 1b
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#endif
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.cfi_endproc
#include "encoding.h"
#include "sifive/bits.h"
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.section .text.entry
.align 2
.global trap_entry
trap_entry:
addi sp, sp, -32*REGBYTES
STORE x30, 1*REGBYTES(sp)
STORE x31, 2*REGBYTES(sp)
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STORE x3, 3*REGBYTES(sp)
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 x10, 29*REGBYTES(sp)
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STORE x1, 30*REGBYTES(sp)
csrr x10, mepc
STORE x10, 31*REGBYTES(sp)
csrr x10, mie
STORE x10, 0*REGBYTES(sp)
/*
*Remain in M-mode after mret
*enable interrupt in M-mode
*/
li t0, MSTATUS_MPP
csrrs t0, mstatus, t0
call rt_interrupt_enter
csrr a0, mcause
lui a5, 0x80000
not a5, a5
and a5, a5, a0
li a4, 11
mv s1, a1
/*Machine external interrupt*/
bne a5, a4, 1f
call rt_hw_trap_irq
1:
/*Machine timer interrupt*/
li a4, 7
bne a5, a4, 2f
call rt_systick_handler
2:
call rt_interrupt_leave
la a0, rt_thread_switch_interrupt_flag
lw a1, (a0)
bnez a1, rt_hw_context_switch_interrupt_do
LOAD x30, 1*REGBYTES(sp)
LOAD x31, 2*REGBYTES(sp)
LOAD x3, 3*REGBYTES(sp)
LOAD x4, 4*REGBYTES(sp)
LOAD x5, 5*REGBYTES(sp)
LOAD x6, 6*REGBYTES(sp)
LOAD x7, 7*REGBYTES(sp)
LOAD x8, 8*REGBYTES(sp)
LOAD x9, 9*REGBYTES(sp)
LOAD x29, 10*REGBYTES(sp)
LOAD x11, 11*REGBYTES(sp)
LOAD x12, 12*REGBYTES(sp)
LOAD x13, 13*REGBYTES(sp)
LOAD x14, 14*REGBYTES(sp)
LOAD x15, 15*REGBYTES(sp)
LOAD x16, 16*REGBYTES(sp)
LOAD x17, 17*REGBYTES(sp)
LOAD x18, 18*REGBYTES(sp)
LOAD x19, 19*REGBYTES(sp)
LOAD x20, 20*REGBYTES(sp)
LOAD x21, 21*REGBYTES(sp)
LOAD x22, 22*REGBYTES(sp)
LOAD x23, 23*REGBYTES(sp)
LOAD x24, 24*REGBYTES(sp)
LOAD x25, 25*REGBYTES(sp)
LOAD x26, 26*REGBYTES(sp)
LOAD x27, 27*REGBYTES(sp)
LOAD x28, 28*REGBYTES(sp)
LOAD x10, 31*REGBYTES(sp)
csrw mepc,x10
LOAD x10, 0*REGBYTES(sp)
csrw mie, x10
LOAD x10, 29*REGBYTES(sp)
LOAD x1, 30*REGBYTES(sp)
addi sp, sp, 32*REGBYTES
mret
rt_hw_context_switch_interrupt_do:
/*clear rt_thread_switch_interrupt_flag*/
la a0, rt_thread_switch_interrupt_flag
li a5, 0
sw a5, (a0)
LOAD a0, rt_interrupt_from_thread
STORE sp, (a0)
LOAD a0, rt_interrupt_to_thread
LOAD sp, (a0)
LOAD x30, 1*REGBYTES(sp)
LOAD x31, 2*REGBYTES(sp)
LOAD x3, 3*REGBYTES(sp)
LOAD x4, 4*REGBYTES(sp)
LOAD x5, 5*REGBYTES(sp)
LOAD x6, 6*REGBYTES(sp)
LOAD x7, 7*REGBYTES(sp)
LOAD x8, 8*REGBYTES(sp)
LOAD x9, 9*REGBYTES(sp)
LOAD x29, 10*REGBYTES(sp)
LOAD x11, 11*REGBYTES(sp)
LOAD x12, 12*REGBYTES(sp)
LOAD x13, 13*REGBYTES(sp)
LOAD x14, 14*REGBYTES(sp)
LOAD x15, 15*REGBYTES(sp)
LOAD x16, 16*REGBYTES(sp)
LOAD x17, 17*REGBYTES(sp)
LOAD x18, 18*REGBYTES(sp)
LOAD x19, 19*REGBYTES(sp)
LOAD x20, 20*REGBYTES(sp)
LOAD x21, 21*REGBYTES(sp)
LOAD x22, 22*REGBYTES(sp)
LOAD x23, 23*REGBYTES(sp)
LOAD x24, 24*REGBYTES(sp)
LOAD x25, 25*REGBYTES(sp)
LOAD x26, 26*REGBYTES(sp)
LOAD x27, 27*REGBYTES(sp)
LOAD x28, 28*REGBYTES(sp)
LOAD x10, 31*REGBYTES(sp)
csrw mepc,x10
LOAD x10, 0*REGBYTES(sp)
csrw mie, x10
LOAD x10, 29*REGBYTES(sp)
LOAD x1, 30*REGBYTES(sp)
addi sp, sp, 32*REGBYTES
mret