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d5c4edca81
Avoid a recursive make to speed things up a bit. This change was inspired by the recent similar patch for c6x: https://sourceware.org/pipermail/newlib/2023/020869.html While at it, fork crt0-minrt.S into a separate source file instead of relying on a predefined macro to generate two different object files. This improves clarity, simplifies the build rules, and would allow further optimization in crt0-minrt.S to be implemented more cleanly. Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>
60 lines
2.0 KiB
ArmAsm
60 lines
2.0 KiB
ArmAsm
/* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* crt0-minrt.S -- Minimal PRU startup code
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*
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* Copyright (c) 2024 Dimitar Dimitrov <dimitar@dinux.eu>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "newlib.h"
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.extern main
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.text
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.section .init0, "x"
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.global _start
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_start:
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/* Initialize stack pointer. */
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ldi32 sp, _stack_top
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/* DATA and BSS are handled by the loader, so nothing to do here. */
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/* Just in case main() tries to access argc, argv[] and envp. */
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zero r14, 3 * 4
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/* Call main. */
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call main
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/* We should never reach here. */
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_crt_exit:
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halt
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jmp _crt_exit
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/* PRU obviously has no shared libraries, but dso_handle
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helps to achieve better GCC test coverage. Besides,
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it should be free with minrt. */
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.section .data
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.global __dso_handle
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.weak __dso_handle
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__dso_handle:
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.long 0
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