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Diffstat (limited to 'libgloss/pru/crt0-minrt.S')
| -rw-r--r-- | libgloss/pru/crt0-minrt.S | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/libgloss/pru/crt0-minrt.S b/libgloss/pru/crt0-minrt.S new file mode 100644 index 000000000..60647d372 --- /dev/null +++ b/libgloss/pru/crt0-minrt.S @@ -0,0 +1,59 @@ +/* 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 |