diff options
Diffstat (limited to 'newlib/libc/sys/sysvi386/crt0.c')
| -rw-r--r-- | newlib/libc/sys/sysvi386/crt0.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/newlib/libc/sys/sysvi386/crt0.c b/newlib/libc/sys/sysvi386/crt0.c new file mode 100644 index 000000000..7949b3d4c --- /dev/null +++ b/newlib/libc/sys/sysvi386/crt0.c @@ -0,0 +1,127 @@ +/*- + * Copyright (c) 1990 The Regents of the University of California. + * 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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. + */ + +#ifndef lint +static char sccsid[] = "@(#)crt0.c 5.7 (Berkeley) 7/3/91"; +#endif /* not lint */ + +/* + * C start up routine. + * Robert Henry, UCB, 20 Oct 81 + * + * We make the following (true) assumption: + * 1) The only register variable that we can trust is ebp, + * which points to the base of the kernel calling frame. + */ + +char **environ = (char **)0; +static int fd; + +/* +asm(".text"); +asm(".long 0xc000c000"); +*/ +extern unsigned char etext; +extern unsigned char eprol asm ("eprol"); +/* extern start() asm("start"); */ + +_start(int arg) +{ + struct kframe { + int kargc; + char *kargv[1]; /* size depends on kargc */ + char kargstr[1]; /* size varies */ + char kenvstr[1]; /* size varies */ + }; + /* + * ALL REGISTER VARIABLES!!! + */ + register struct kframe *kfp; /* r10 */ + register char **targv; + register char **argv; + extern int errno; + extern void _mcleanup(); + +#ifdef lint + kfp = 0; + initcode = initcode = 0; +#else not lint +# if 0 + asm("lea 4(%ebp),%ebx"); /* catch it quick */ +# else + kfp = (struct kframe *)&(((int *)(&arg))[-1]); +# endif +#endif not lint + for (argv = targv = &kfp->kargv[0]; *targv++; /* void */) + /* void */ ; + if (targv >= (char **)(*argv)) + --targv; + environ = targv; +asm("eprol:"); + +#ifdef paranoid + /* + * The standard I/O library assumes that file descriptors 0, 1, and 2 + * are open. If one of these descriptors is closed prior to the start + * of the process, I/O gets very confused. To avoid this problem, we + * insure that the first three file descriptors are open before calling + * main(). Normally this is undefined, as it adds two unnecessary + * system calls. + */ + do { + fd = open("/dev/null", 2); + } while (fd >= 0 && fd < 3); + close(fd); +#endif paranoid + +#ifdef MCRT0 + atexit(_mcleanup); + monstartup(&eprol, &etext); +#endif MCRT0 + errno = 0; + exit(main(kfp->kargc, argv, environ)); +} + +#ifdef CRT0 +/* + * null mcount and moncontrol, + * just in case some routine is compiled for profiling + */ +moncontrol(val) + int val; +{ + +} +asm(".globl mcount"); +asm("mcount: ret"); +#endif CRT0 |