mirror of
git://sourceware.org/git/newlib-cygwin.git
synced 2025-01-25 08:37:33 +08:00
60 lines
2.0 KiB
ArmAsm
60 lines
2.0 KiB
ArmAsm
|
/* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
||
|
|
*
|
||
|
|
* crt0-minrt.S -- Minimal PRU startup code
|
||
|
|
*
|
||
|
|
* Copyright (c) 2024 Dimitar Dimitrov <dimitar@dinux.eu>
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* 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 ``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 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.
|
||
|
|
*/
|
||
|
|
#include "newlib.h"
|
||
|
|
|
||
|
|
.extern main
|
||
|
|
|
||
|
|
.text
|
||
|
|
.section .init0, "x"
|
||
|
|
.global _start
|
||
|
|
_start:
|
||
|
|
/* Initialize stack pointer. */
|
||
|
|
ldi32 sp, _stack_top
|
||
|
|
|
||
|
|
/* DATA and BSS are handled by the loader, so nothing to do here. */
|
||
|
|
|
||
|
|
/* Just in case main() tries to access argc, argv[] and envp. */
|
||
|
|
zero r14, 3 * 4
|
||
|
|
|
||
|
|
/* Call main. */
|
||
|
|
call main
|
||
|
|
|
||
|
|
/* We should never reach here. */
|
||
|
|
_crt_exit:
|
||
|
|
halt
|
||
|
|
jmp _crt_exit
|
||
|
|
|
||
|
|
/* PRU obviously has no shared libraries, but dso_handle
|
||
|
|
helps to achieve better GCC test coverage. Besides,
|
||
|
|
it should be free with minrt. */
|
||
|
|
.section .data
|
||
|
|
.global __dso_handle
|
||
|
|
.weak __dso_handle
|
||
|
|
__dso_handle:
|
||
|
|
.long 0
|