diff options
Diffstat (limited to 'bsp/env/freedom-e300-hifive1/start.S')
| -rw-r--r-- | bsp/env/freedom-e300-hifive1/start.S | 115 |
1 files changed, 46 insertions, 69 deletions
diff --git a/bsp/env/freedom-e300-hifive1/start.S b/bsp/env/freedom-e300-hifive1/start.S index c8ec662..2388ec0 100644 --- a/bsp/env/freedom-e300-hifive1/start.S +++ b/bsp/env/freedom-e300-hifive1/start.S @@ -1,81 +1,58 @@ -/*- - * Copyright (c) 2013-2015 Marko Zec, University of Zagreb - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * $Id$ - */ - -/* - * Copy data, clear BSS, set small data index register and jump into main(). - * - * Assumes that the loader has already properly: - * 1) set stack pointer - * 2) set return address - * 3) invalidated caches - */ +// See LICENSE for license details. .section .init .globl _start .type _start,@function _start: - la gp, _gp - la sp, _sp - - /* Load data sections */ - la s0, _data - la s1, _edata - la s2, _data_lma - j 2f + la gp, _gp + la sp, _sp + + /* Load data section */ + la a0, _data_lma + la a1, _data + la a2, _edata + bgeu a1, a2, 2f 1: - lw t0, (s2) - sw t0, (s0) - addi s2, s2, 4 - addi s0, s0, 4 + lw t0, (a0) + sw t0, (a1) + addi a0, a0, 4 + addi a1, a1, 4 + bltu a1, a2, 1b 2: - bltu s0, s1, 1b - la s1, _end /* End of BSS section, word aligned */ - la s0, __bss_start /* Start of BSS section, word aligned */ - j bss_bzero_enter + /* 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: - /* The loader doesn't bzero the BSS, so we must do it here. */ -bss_bzero_loop: - sw zero, (s0) - addi s0, s0, 4 -bss_bzero_enter: - bne s0, s1, bss_bzero_loop + /* Call global constructors */ + la a0, __libc_fini_array + call atexit + call __libc_init_array + +#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 - la s0, __init_array_start - la s1, __init_array_end - move s2, ra - j ctor_loop_enter + call main + tail exit -ctor_loop: - lw a0, (s0) - addi s0, s0, 4 - jalr a0 -ctor_loop_enter: - bne s0, s1, ctor_loop - move ra, s2 - j _init + /* init_array/fini_array are used instead */ + .globl _init + .globl _fini +_init: +_fini: + ret |