lib/csu/arm32/crt0.c

   1 /*      $NetBSD: crt0.c,v 1.12 2008/03/15 10:46:24 rearnsha Exp $       */
   2
   3 /*
   4  * Copyright (C) 1997 Mark Brinicombe
   5  * Copyright (C) 1995 Wolfgang Solfrank.
   6  * Copyright (C) 1995 TooLs GmbH.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by TooLs GmbH.
  20  * 4. The name of TooLs GmbH may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  27  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  28  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  29  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  30  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  31  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  32  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #include <stdlib.h>
  37
  38 #include "common.h"
  39
  40 #if defined (_ARM_ARCH_6) || defined (__ARM_ARCH_5__) || \
  41     defined (__ARM_ARCH_5T__) || defined (__ARM_ARCH_5TE__) || \
  42     defined (__ARM_ARCH_5TEJ__)
  43 #define _ARM_ARCH_5
  44 #endif
  45
  46 #if defined (_ARM_ARCH_5) || defined (__ARM_ARCH_4T__)
  47 #define _ARM_ARCH_4T
  48 #endif
  49
  50 #undef mmap
  51 #define mmap(addr, len, prot, flags, fd, off)                   \
  52         __syscall(SYS_mmap, (addr), (len), (prot), (flags),     \
  53         (fd), 0, (off_t)(off))
  54
  55 extern  void            start(void) __asm("start");
  56         void            __start(int, char *[], char *[]);
  57
  58 __asm("
  59         .text
  60         .align  0
  61         .global start
  62 start:
  63         /* Get ps_strings pointer from kernel */
  64         teq     r10, #0
  65         ldr     r3, Lps_strings
  66         movne   r0, #0
  67         str     r0, [r3]
  68
  69         /* Get argc, argv, and envp from stack */
  70         ldr     r0, [sp, #0x0000]
  71         add     r1, sp, #0x0004
  72         add     r2, r1, r0, lsl #2
  73         add     r2, r2, #0x0004
  74
  75         b       " ___STRING(_C_LABEL(__start)) "
  76         .align  0
  77 Lps_strings:
  78         .word   " ___STRING(_C_LABEL(__ps_strings)) "
  79 ");
  80
  81 #if defined(LIBC_SCCS) && !defined(lint)
  82 __RCSID("$NetBSD: crt0.c,v 1.12 2008/03/15 10:46:24 rearnsha Exp $");
  83 #endif /* LIBC_SCCS and not lint */
  84
  85 void
  86 __start(int argc, char **argv, char **envp)
  87 {
  88         char *ap;
  89
  90         environ = envp;
  91
  92         if ((ap = argv[0]))
  93                 if ((__progname = _strrchr(ap, '/')) == NULL)
  94                         __progname = ap;
  95                 else
  96                         ++__progname;
  97
  98 #ifdef  DYNAMIC
  99         /* ld(1) convention: if DYNAMIC = 0 then statically linked */
 100         if (&_DYNAMIC)
 101                 __load_rtld(&_DYNAMIC);
 102 #endif  /* DYNAMIC */
 103
 104 #ifdef MCRT0
 105         atexit(_mcleanup);
 106         monstartup((u_long)&eprol, (u_long)&etext);
 107 #endif  /* MCRT0 */
 108
 109 __asm("__callmain:");           /* Defined for the benefit of debuggers */
 110         exit(main(argc, argv, envp));
 111 }
 112
 113 #ifndef ntohl
 114 inline in_addr_t
 115 __crt0_swap(x)
 116         in_addr_t x;
 117 {
 118 #if BYTE_ORDER == LITTLE_ENDIAN
 119         return(   ((x & 0x000000ff) << 24)
 120                 | ((x & 0x0000ff00) << 8)
 121                 | ((x & 0x00ff0000) >> 8)
 122                 | ((x & 0xff000000) >> 24));
 123 #else
 124         return x;
 125 #endif  /* BYTE_ORDER */
 126 }
 127
 128 #define ntohl(x)        __crt0_swap(x)
 129 #define htonl(x)        __crt0_swap(x)
 130 #endif  /* ntohl */
 131
 132 #ifdef  DYNAMIC
 133 __asm("
 134         .text
 135         .align  0
 136 ___syscall:
 137         swi     0
 138         mvncs   r0, #0
 139 "
 140 #ifdef _ARM_ARCH_4T
 141 "       bx      lr
 142 "
 143 #else
 144 "       mov     pc, lr
 145 "
 146 #endif
 147 );
 148 #endif  /* DYNAMIC */
 149
 150 #include "common.c"
 151
 152 #ifdef MCRT0
 153 __asm("
 154         .text
 155         .align 0
 156 eprol:
 157 ");
 158 #endif  /* MCRT0 */