minix/lib/csu/arch/earm/crt0.S

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ArmAsm
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/* $NetBSD: crt0.S,v 1.1 2012/08/13 02:49:04 matt Exp $ */
/*-
* Copyright (c) 2012 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas of 3am Software Foundry.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include <arm/asm.h>
RCSID("$NetBSD: crt0.S,v 1.1 2012/08/13 02:49:04 matt Exp $")
STRONG_ALIAS(_start,__start)
_ENTRY(__start)
#ifdef __minix
mov r3, r2 /* cleanup */
mov r4, r1 /* obj_main */
and r5, r5, #0 /* ps_strings, always NULL on MINIX */
/* Get argc, argv, and envp from stack */
ldr r0, [sp, #0] /* get argc */
add r1, sp, #4 /* argv = sp + 4 */
add r2, r1, r0, lsl #2 /* envp = argv + argc*4 */
add r2, r2, #4 /* skip NULL terminator */
#else
/*
* We need to swap ps_strings and cleanup
*/
mov ip, r0 /* ps_strings -> tmp */
mov r0, r2 /* cleanup -> ps_strings */
mov r2, ip /* tmp -> ps_strings */
#endif /* __minix */
/* Ensure the stack is properly aligned before calling C code. */
bic sp, sp, #7
#ifdef __minix
/* Store obj and ps_strings on the stack */
sub sp, sp, #8
str r5, [sp, #4]
str r4, [sp, #0]
#endif
/*
* void ___start(void (*cleanup)(void),
* const Obj_Entry *obj,
* struct ps_strings *ps_strings);
*/
b ___start