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Set __ps_strings at startup. Move the argv/envp setup into a short assembler 

prologue.  General cleanup.
This commit is contained in:
mycroft 1996-12-07 22:34:09 +00:00
parent e1af33609a
commit a54c49b343
1 changed files with 53 additions and 44 deletions
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97
lib/csu/i386/crt0.c
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@ -1,6 +1,7 @@
/* $NetBSD: crt0.c,v 1.21 1996/10/18 05:36:51 thorpej Exp $ */
/* $NetBSD: crt0.c,v 1.22 1996/12/07 22:34:09 mycroft Exp $ */
/*
* Copyright (c) 1996 Charles M. Hannum. All rights reserved.
* Copyright (c) 1993 Paul Kranenburg
* All rights reserved.
*
@ -32,40 +33,44 @@
#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: crt0.c,v 1.21 1996/10/18 05:36:51 thorpej Exp $";
static char rcsid[] = "$NetBSD: crt0.c,v 1.22 1996/12/07 22:34:09 mycroft Exp $";
#endif /* LIBC_SCCS and not lint */
#include <sys/param.h>
#include <sys/syscall.h>
#include <stdlib.h>
#include "common.h"
extern void start __P((void)) asm("start");
extern unsigned char etext;
extern unsigned char eprol asm("eprol");
extern void start __P((void)) asm("start");
__asm("
.text
.align 2
.globl start
start:
movl %ebx,___ps_strings
movl (%esp),%eax
leal 8(%esp,%eax,4),%ecx
leal 4(%esp),%edx
pushl %ecx
pushl %edx
pushl %eax
call ___start
");
void
start()
__start(argc, argv, envp)
int argc;
char *argv[];
char *envp[];
{
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;
register char **argv, *ap;
char *ap;
#ifdef lint
kfp = 0;
initcode = initcode = 0;
#else /* not lint */
/* just above the saved frame pointer */
asm ("lea 4(%%ebp), %0" : "=r" (kfp) );
#endif /* not lint */
argv = &kfp->kargv[0];
environ = argv + kfp->kargc + 1;
environ = envp;
if (ap = argv[0])
if ((__progname = _strrchr(ap, '/')) == NULL)
@ -83,35 +88,39 @@ start()
__load_rtld(&_DYNAMIC);
#endif /* DYNAMIC */
asm("eprol:");
#ifdef MCRT0
atexit(_mcleanup);
monstartup((u_long)&eprol, (u_long)&etext);
#endif MCRT0
#endif /* MCRT0 */
asm ("__callmain:"); /* Defined for the benefit of debuggers */
exit(main(kfp->kargc, argv, environ));
__asm("__callmain:"); /* Defined for the benefit of debuggers */
exit(main(argc, argv, envp));
}
#ifdef DYNAMIC
asm(" ___syscall:");
asm(" popl %ecx");
asm(" popl %eax");
asm(" pushl %ecx");
asm(" int $0x80");
asm(" pushl %ecx");
asm(" jc 1f");
asm(" ret");
asm(" 1:");
asm(" movl $-1,%eax");
asm(" ret");
asm("
.text
.align 2
___syscall:
popl %ecx
popl %eax
pushl %ecx
int $0x80
pushl %ecx
jc 1f
ret
1:
movl $-1,%eax
ret
");
#endif /* DYNAMIC */
#include "common.c"
#ifdef MCRT0
asm (" .text");
asm ("_eprol:");
#endif
__asm("
.text
.align 2
eprol:
");
#endif /* MCRT0 */