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Sharing the crt sources with i386-elf wasn't too successful. The crti

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asm code didn't link the way it was supposed to and the calling convention
for the entry "function" turned out to be very different. On alpha
it's a true function, but on i386 it's a fudge. Blech.

So jdp suggested keeping separate sets of source and avoiding lots
of #ifdefs. These files are based on his i386-elf code, with crt1.c
borrowing code from NetBSD's crt0. The copyright reflects that.

Complicating matters, the code turned out to be difficult to bootstrap
build using NetBSD tools. To compile against the FreeBSD rtld header
requires FreeBSD specific headers, but these can't be installed until
the tools are built, and they can't be built without the FreeBSD crt
objects. Anal retentive. So I introduced a HAVE_RTLD #define that isn't
set during the build process until all the tools are built and the
headers installed.
This commit is contained in:
John Birrell 1998-03-11 20:36:11 +00:00
parent ab10ac1949
commit 1901906aa6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/cvs2svn/branches/jb/; revision=34484
3 changed files with 165 additions and 18 deletions
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84
lib/csu/alpha/crt1.c
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@ -1,6 +1,8 @@
/*-
* Copyright 1996-1998 John D. Polstra.
* All rights reserved.
* Copyright (c) 1995 Christopher G. Demetriou
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -10,6 +12,12 @@
* 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 Christopher G. Demetriou
* for the NetBSD Project.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
@ -31,33 +39,73 @@
#include <stdlib.h>
typedef void (*fptr)(void);
#ifdef HAVE_RTLD
#include <sys/exec.h>
#include <sys/syscall.h>
#include <rtld.h>
extern void _fini(void);
extern void _init(void);
extern int main(int, char **, char **);
const Obj_Entry *__mainprog_obj;
extern int __syscall (int, ...);
#define _exit(v) __syscall(SYS_exit, (v))
#define write(fd, s, n) __syscall(SYS_write, (fd), (s), (n))
#define _FATAL(str) \
do { \
write(2, str, sizeof(str)); \
_exit(1); \
} while (0)
extern int _DYNAMIC;
#pragma weak _DYNAMIC
extern int _DYNAMIC;
#else
/*
* When doing a bootstrap build, the header files for runtime
* loader support are not available, so this source file is
* compiled to a static object.
*/
#define Obj_Entry void
struct ps_strings;
#endif
extern void _init(void);
extern void _fini(void);
extern int main(int, char **, char **);
char **environ;
char *__progname = "";
/* The entry function. */
void
_start(char *arguments, ...)
_start(char **ap,
void (*cleanup)(void), /* from shared loader */
const Obj_Entry *obj, /* from shared loader */
struct ps_strings *ps_strings)
{
int argc;
char **argv;
char **env;
int argc;
char **argv;
char **env;
argv = &arguments;
argc = * (int *) (argv - 1);
env = argv + argc + 1;
environ = env;
if(argc > 0)
__progname = argv[0];
argc = * (long *) ap;
argv = ap + 1;
env = ap + 2 + argc;
environ = env;
if(argc > 0)
__progname = argv[0];
atexit(_fini);
_init();
exit( main(argc, argv, env) );
#ifdef HAVE_RTLD
if (&_DYNAMIC != NULL) {
if ((obj == NULL) || (obj->magic != RTLD_MAGIC))
_FATAL("Corrupt Obj_Entry pointer in GOT");
if (obj->version != RTLD_VERSION)
_FATAL("Dynamic linker version mismatch");
__mainprog_obj = obj;
atexit(cleanup);
}
#endif
atexit(_fini);
_init();
exit( main(argc, argv, env) );
}

68
lib/csu/alpha/crtbegin.c Normal file
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@ -0,0 +1,68 @@
/*-
* Copyright 1996-1998 John D. Polstra.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* $Id: crtbegin.c,v 1.1.1.1 1998/03/07 20:27:10 jdp Exp $
*/
typedef void (*fptr)(void);
static fptr ctor_list[1] __attribute__((section(".ctors"))) = { (fptr) -1 };
static fptr dtor_list[1] __attribute__((section(".dtors"))) = { (fptr) -1 };
/* Both do_ctors() and do_dtors() live in .text (the default) */
static void
do_ctors(void)
{
fptr *fpp;
for(fpp = ctor_list + 1; *fpp != 0; ++fpp)
(**fpp)();
}
static void
do_dtors(void)
{
fptr *fpp;
for(fpp = dtor_list + 1; *fpp != 0; ++fpp)
;
while(--fpp > dtor_list)
(**fpp)();
}
extern void _init(void) __attribute__((section(".init")));
void
_init(void)
{
do_ctors();
}
extern void _fini(void) __attribute__((section(".fini")));
void
_fini(void)
{
do_dtors();
}

31
lib/csu/alpha/crtend.c Normal file
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@ -0,0 +1,31 @@
/*-
* Copyright 1996-1998 John D. Polstra.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* $Id: crtend.c,v 1.1.1.1 1998/03/07 20:27:10 jdp Exp $
*/
typedef void (*fptr)(void);
static fptr ctor_end[1] __attribute__((section(".ctors"))) = { 0 };
static fptr dtor_end[1] __attribute__((section(".dtors"))) = { 0 };