[bpt/emacs.git] / src / ecrt0.c

/* C code startup routine.
   Copyright (C) 1985, 1986, 1992, 2001, 2002, 2003, 2004,
                 2005, 2006, 2007, 2008 Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.  */


/* The standard Vax 4.2 Unix crt0.c cannot be used for Emacs
   because it makes `environ' an initialized variable.
   It is easiest to have a special crt0.c on all machines
   though I don't know whether other machines actually need it.  */

/* On the vax and 68000, in BSD4.2 and USG5.2,
   this is the data format on startup:
  (vax) ap and fp are unpredictable as far as I know; don't use them.
  sp ->  word containing argc
         word pointing to first arg string
	 [word pointing to next arg string]... 0 or more times
	 0
Optionally:
	 [word pointing to environment variable]... 1 or more times
	 ...
	 0
And always:
	 first arg string
	 [next arg string]... 0 or more times
*/

/* On the 16000, at least in the one 4.2 system I know about,
  the initial data format is
  sp ->  word containing argc
         word containing argp
         word pointing to first arg string, and so on as above
*/

#ifdef emacs
#include <config.h>
#endif

/*		********  WARNING ********
    Do not insert any data definitions before data_start!
    Since this is the first file linked, the address of the following
    variable should correspond to the start of initialized data space.
    On some systems this is a constant that is independent of the text
    size for shared executables.  On others, it is a function of the
    text size. In short, this seems to be the most portable way to
    discover the start of initialized data space dynamically at runtime,
    for either shared or unshared executables, on either swapping or
    virtual systems.  It only requires that the linker allocate objects
    in the order encountered, a reasonable model for most Unix systems.
    Similarly, note that the address of _start() should be the start
    of text space.   Fred Fish, UniSoft Systems Inc.  */

int data_start = 0;

#ifdef NEED_ERRNO
int errno;
#endif

#ifndef MSDOS
char **environ;
#endif

#ifndef static
/* On systems where the static storage class is usable, this function
   should be declared as static.  Otherwise, the static keyword has
   been defined to be something else, and code for those systems must
   take care of this declaration appropriately.  */
static start1 ();
#endif

#ifdef CRT0_DUMMIES

/* Define symbol "start": here; some systems want that symbol.  */
#ifdef DOT_GLOBAL_START
asm("	.text		");
asm("	.globl start	");
asm("	start:		");
#endif /* DOT_GLOBAL_START */

#ifdef NODOT_GLOBAL_START
asm("	text		");
asm("	global start	");
asm("	start:		");
#endif /* NODOT_GLOBAL_START */

#ifdef m68000

/* GCC 2.1, when optimization is turned off, seems to want to push a
   word of garbage on the stack, which screws up the CRT0_DUMMIES
   hack.  So we hand-code _start in assembly language.  */
asm(".text			");
asm("	.even			");
asm(".globl __start		");
asm("__start:			");
asm("	link a6,#0		");
asm("	jbsr _start1		");
asm("	unlk a6			");
asm("	rts			");

#else /* not m68000 */

_start ()
{
/* On vax, nothing is pushed here  */
/* On sequent, bogus fp is pushed here  */
  start1 ();
}

#endif /* possibly m68000 */

static
start1 (CRT0_DUMMIES argc, xargv)
     int argc;
     char *xargv;
{
  register char **argv = &xargv;
  environ = argv + argc + 1;

  if ((char *)environ == xargv)
    environ--;
  exit (main (argc, argv, environ));

  /* Refer to `start1' so GCC will not think it is never called
     and optimize it out.  */
  (void) &start1;
}
#else /* not CRT0_DUMMIES */

/* "m68k" and "m68000" both stand for m68000 processors,
   but with different program-entry conventions.
   This is a kludge.  Now that the CRT0_DUMMIES mechanism above exists,
   most of these machines could use the vax code above
   with some suitable definition of CRT0_DUMMIES.
   Then the symbol m68k could be flushed.
   But I don't want to risk breaking these machines
   in a version 17 patch release, so that change is being put off.  */

#ifdef m68k			/* Can't do it all from C */
	asm ("	global	_start");
	asm ("	text");
	asm ("_start:");
	asm ("  comm	splimit%,4");
	asm ("	global	exit");
	asm ("	text");
  	asm ("	mov.l	%d0,splimit%");
	asm ("	jsr	start1");
	asm ("	mov.l	%d0,(%sp)");
	asm ("	jsr	exit");
	asm ("	mov.l	&1,%d0");	/* d0 = 1 => exit */
	asm ("	trap	&0");
#else /* m68000, not m68k */

#ifdef m68000

_start ()
{
#ifdef sun
  finitfp_();
#endif
/* On 68000, _start pushes a6 onto stack  */
  start1 ();
}
#endif /* m68000 */
#endif /* m68k */

#if defined(m68k) || defined(m68000)
/* ignore takes care of skipping the a6 value pushed in start.  */
static
#if defined(m68k)
start1 (argc, xargv)
#else
start1 (ignore, argc, xargv)
#endif
     int argc;
     char *xargv;
{
  register char **argv = &xargv;
  environ = argv + argc + 1;

  if ((char *)environ == xargv)
    environ--;
  exit (main (argc, argv, environ));
}

#endif /* m68k or m68000 */

#endif /* not CRT0_DUMMIES */

#ifdef hp9000s300
int argc_value;
char **argv_value;
#ifdef OLD_HP_ASSEMBLER
	asm("   text");
	asm("	globl __start");
	asm("	globl _exit");
	asm("	globl _main");
	asm("__start");
	asm("	dc.l	0");
	asm("	subq.w	#0x1,d0");
	asm("	move.w	d0,float_soft");
	asm("	move.l	0x4(a7),d0");
	asm("	beq.s	skip_1");
	asm("	move.l	d0,a0");
	asm("	clr.l	-0x4(a0)");
	asm("skip_1");
	asm("	move.l	a7,a0");
	asm("	subq.l	#0x8,a7");
	asm("	move.l	(a0),(a7)");
	asm("	move.l	(a0),_argc_value");
	asm("	addq.l	#0x4,a0");
	asm("	move.l	a0,0x4(a7)");
	asm("	move.l	a0,_argv_value");
	asm("incr_loop");
	asm("	tst.l	(a0)+");
	asm("	bne.s	incr_loop");
	asm("	move.l	0x4(a7),a1");
	asm("	cmp.l	(a1),a0");
	asm("	blt.s	skip_2");
	asm("	subq.l	#0x4,a0");
	asm("skip_2");
	asm("	move.l	a0,0x8(a7)");
	asm("	move.l	a0,_environ");
	asm("	jsr	_main");
	asm("	addq.l	#0x8,a7");
	asm("	move.l	d0,-(a7)");
	asm("	jsr	_exit");
	asm("	move.w	#0x1,d0");
	asm("	trap	#0x0");
	asm("	comm	float_soft,4");
/* float_soft is allocated in this way because C would
   put an underscore character in its name otherwise. */

#else /* new hp assembler */

	asm("	text");
        asm("   global  float_loc");
        asm("   set     float_loc,0xFFFFB000");
 	asm("	global	fpa_loc");
	asm("	set	fpa_loc,0xfff08000");
	asm("	global	__start");
	asm("	global	_exit");
	asm("	global	_main");
	asm("__start:");
	asm("	byte	0,0,0,0");
	asm("	subq.w	&1,%d0");
	asm("	mov.w	%d0,float_soft");
	asm("	mov.w	%d1,flag_68881");
#ifndef HPUX_68010
	asm("	beq.b	skip_float");
	asm("	fmov.l	&0x7400,%fpcr");
/*	asm("	fmov.l	&0x7480,%fpcr"); */
#endif /* HPUX_68010 */
	asm("skip_float:");
	asm("	mov.l	%a0,%d0");
	asm("	add.l	%d0,%d0");
	asm("	subx.w	%d1,%d1");
	asm("	mov.w	%d1,flag_68010");
	asm("	add.l	%d0,%d0");
	asm("	subx.w	%d1,%d1");
	asm("	mov.w	%d1,flag_fpa");
	asm("	tst.l	%d2");
	asm("	ble.b	skip_3");
	asm("	lsl	flag_68881");
	asm("	lsl	flag_fpa");
	asm("skip_3:");
	asm("	mov.l	4(%a7),%d0");
	asm("	beq.b	skip_1");
	asm("	mov.l	%d0,%a0");
	asm("	clr.l	-4(%a0)");
	asm("skip_1:");
	asm("	mov.l	%a7,%a0");
	asm("	subq.l	&8,%a7");
	asm("	mov.l	(%a0),(%a7)");
	asm("	mov.l	(%a0),_argc_value");
	asm("	addq.l	&4,%a0");
	asm("	mov.l	%a0,4(%a7)");
	asm("	mov.l	%a0,_argv_value");
	asm("incr_loop:");
	asm("	tst.l	(%a0)+");
	asm("	bne.b	incr_loop");
	asm("	mov.l	4(%a7),%a1");
	asm("	cmp.l	%a0,(%a1)");
	asm("	blt.b	skip_2");
	asm("	subq.l	&4,%a0");
	asm("skip_2:");
	asm("	mov.l	%a0,8(%a7)");
	asm("	mov.l	%a0,_environ");
	asm("	jsr	_main");
	asm("	addq.l	&8,%a7");
	asm("	mov.l	%d0,-(%a7)");
	asm("	jsr	_exit");
	asm("	mov.w	&1,%d0");
	asm("	trap	&0");
	asm("	comm	float_soft, 4");
	asm("	comm	flag_68881, 4");
	asm("	comm	flag_68010, 4");
	asm("	comm	flag_68040, 4");
	asm("	comm	flag_fpa, 4");

#endif /* new hp assembler */
#endif /* hp9000s300 */

#ifdef sparc
asm (".global __start");
asm (".text");
asm ("__start:");
asm ("	mov	0, %fp");
asm ("	ld	[%sp + 64], %o0");
asm ("	add	%sp, 68, %o1");
asm ("	sll	%o0, 2,	%o2");
asm ("	add	%o2, 4,	%o2");
asm ("	add	%o1, %o2, %o2");
asm ("	sethi	%hi(_environ), %o3");
asm ("	st	%o2, [%o3+%lo(_environ)]");
asm ("	andn	%sp, 7,	%sp");
asm ("	call	_main");
asm ("	sub	%sp, 24, %sp");
asm ("	call	__exit");
asm ("	nop");

#endif /* sparc */

#if __FreeBSD__ == 2
char *__progname;
#endif
#ifdef __bsdi__
#include <sys/param.h> /* for version number */
#if defined(_BSDI_VERSION) && (_BSDI_VERSION >= 199501)
char *__progname;
#endif
#endif /* __bsdi__ */

/* arch-tag: 4025c2fb-d6b1-4d29-b1b6-8100b6bd1e74
   (do not change this comment) */
Commit	Line	Data
b8098ef8	1	/* C code startup routine.
429ab54e	2	Copyright (C) 1985, 1986, 1992, 2001, 2002, 2003, 2004,
8cabe764	3	2005, 2006, 2007, 2008 Free Software Foundation, Inc.
b8098ef8 DL	4
	5	This file is part of GNU Emacs.
	6
	7	GNU Emacs is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
684d6f5b	9	the Free Software Foundation; either version 3, or (at your option)
b8098ef8 DL	10	any later version.
	11
	12	GNU Emacs is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with GNU Emacs; see the file COPYING. If not, write to
4fc5845f LK	19	the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
4fc5845f LK	20	Boston, MA 02110-1301, USA. */
b8098ef8 DL	21
	22
	23	/* The standard Vax 4.2 Unix crt0.c cannot be used for Emacs
	24	because it makes `environ' an initialized variable.
	25	It is easiest to have a special crt0.c on all machines
	26	though I don't know whether other machines actually need it. */
	27
	28	/* On the vax and 68000, in BSD4.2 and USG5.2,
	29	this is the data format on startup:
	30	(vax) ap and fp are unpredictable as far as I know; don't use them.
	31	sp -> word containing argc
	32	word pointing to first arg string
	33	[word pointing to next arg string]... 0 or more times
	34	0
	35	Optionally:
	36	[word pointing to environment variable]... 1 or more times
	37	...
	38	0
	39	And always:
	40	first arg string
	41	[next arg string]... 0 or more times
	42	*/
	43
	44	/* On the 16000, at least in the one 4.2 system I know about,
	45	the initial data format is
	46	sp -> word containing argc
	47	word containing argp
	48	word pointing to first arg string, and so on as above
	49	*/
	50
	51	#ifdef emacs
	52	#include <config.h>
	53	#endif
	54
	55	/* ****** WARNING ******
	56	Do not insert any data definitions before data_start!
	57	Since this is the first file linked, the address of the following
	58	variable should correspond to the start of initialized data space.
	59	On some systems this is a constant that is independent of the text
	60	size for shared executables. On others, it is a function of the
	61	text size. In short, this seems to be the most portable way to
	62	discover the start of initialized data space dynamically at runtime,
	63	for either shared or unshared executables, on either swapping or
	64	virtual systems. It only requires that the linker allocate objects
	65	in the order encountered, a reasonable model for most Unix systems.
	66	Similarly, note that the address of _start() should be the start
	67	of text space. Fred Fish, UniSoft Systems Inc. */
	68
	69	int data_start = 0;
	70
	71	#ifdef NEED_ERRNO
	72	int errno;
	73	#endif
	74
4624371d	75	#ifndef MSDOS
b8098ef8 DL	76	char **environ;
	77	#endif
	78
	79	#ifndef static
	80	/* On systems where the static storage class is usable, this function
	81	should be declared as static. Otherwise, the static keyword has
	82	been defined to be something else, and code for those systems must
	83	take care of this declaration appropriately. */
	84	static start1 ();
	85	#endif
	86
b8098ef8 DL	87	#ifdef CRT0_DUMMIES
	88
	89	/* Define symbol "start": here; some systems want that symbol. */
	90	#ifdef DOT_GLOBAL_START
	91	asm(" .text ");
	92	asm(" .globl start ");
	93	asm(" start: ");
	94	#endif /* DOT_GLOBAL_START */
	95
	96	#ifdef NODOT_GLOBAL_START
	97	asm(" text ");
	98	asm(" global start ");
	99	asm(" start: ");
	100	#endif /* NODOT_GLOBAL_START */
	101
	102	#ifdef m68000
	103
	104	/* GCC 2.1, when optimization is turned off, seems to want to push a
	105	word of garbage on the stack, which screws up the CRT0_DUMMIES
	106	hack. So we hand-code _start in assembly language. */
	107	asm(".text ");
	108	asm(" .even ");
	109	asm(".globl __start ");
	110	asm("__start: ");
	111	asm(" link a6,#0 ");
	112	asm(" jbsr _start1 ");
	113	asm(" unlk a6 ");
	114	asm(" rts ");
	115
	116	#else /* not m68000 */
	117
	118	_start ()
	119	{
	120	/* On vax, nothing is pushed here */
	121	/* On sequent, bogus fp is pushed here */
	122	start1 ();
	123	}
	124
	125	#endif /* possibly m68000 */
	126
	127	static
	128	start1 (CRT0_DUMMIES argc, xargv)
	129	int argc;
	130	char *xargv;
	131	{
	132	register char **argv = &xargv;
	133	environ = argv + argc + 1;
	134
	135	if ((char *)environ == xargv)
	136	environ--;
	137	exit (main (argc, argv, environ));
	138
	139	/* Refer to `start1' so GCC will not think it is never called
	140	and optimize it out. */
	141	(void) &start1;
	142	}
	143	#else /* not CRT0_DUMMIES */
	144
	145	/* "m68k" and "m68000" both stand for m68000 processors,
	146	but with different program-entry conventions.
	147	This is a kludge. Now that the CRT0_DUMMIES mechanism above exists,
	148	most of these machines could use the vax code above
	149	with some suitable definition of CRT0_DUMMIES.
	150	Then the symbol m68k could be flushed.
151	But I don't want to risk breaking these machines
152	in a version 17 patch release, so that change is being put off. */
153
154	#ifdef m68k /* Can't do it all from C */
155	asm (" global _start");
156	asm (" text");
157	asm ("_start:");
b8098ef8	158	asm (" comm splimit%,4");
b8098ef8 DL	159	asm (" global exit");
b8098ef8 DL	160	asm (" text");
b8098ef8	161	asm (" mov.l %d0,splimit%");
b8098ef8 DL	162	asm (" jsr start1");
	163	asm (" mov.l %d0,(%sp)");
	164	asm (" jsr exit");
	165	asm (" mov.l &1,%d0"); /* d0 = 1 => exit */
	166	asm (" trap &0");
	167	#else /* m68000, not m68k */
	168
	169	#ifdef m68000
	170
b8098ef8 DL	171	_start ()
	172	{
	173	#ifdef sun
b8098ef8	174	finitfp_();
177c0ea7	175	#endif
b8098ef8 DL	176	/* On 68000, _start pushes a6 onto stack */
	177	start1 ();
	178	}
b8098ef8 DL	179	#endif /* m68000 */
	180	#endif /* m68k */
	181
	182	#if defined(m68k) \|\| defined(m68000)
	183	/* ignore takes care of skipping the a6 value pushed in start. */
	184	static
	185	#if defined(m68k)
	186	start1 (argc, xargv)
	187	#else
	188	start1 (ignore, argc, xargv)
	189	#endif
	190	int argc;
	191	char *xargv;
	192	{
	193	register char **argv = &xargv;
	194	environ = argv + argc + 1;
	195
	196	if ((char *)environ == xargv)
	197	environ--;
b8098ef8 DL	198	exit (main (argc, argv, environ));
	199	}
	200
	201	#endif /* m68k or m68000 */
	202
	203	#endif /* not CRT0_DUMMIES */
	204
	205	#ifdef hp9000s300
	206	int argc_value;
	207	char **argv_value;
	208	#ifdef OLD_HP_ASSEMBLER
	209	asm(" text");
	210	asm(" globl __start");
	211	asm(" globl _exit");
	212	asm(" globl _main");
	213	asm("__start");
	214	asm(" dc.l 0");
	215	asm(" subq.w #0x1,d0");
	216	asm(" move.w d0,float_soft");
	217	asm(" move.l 0x4(a7),d0");
	218	asm(" beq.s skip_1");
	219	asm(" move.l d0,a0");
	220	asm(" clr.l -0x4(a0)");
	221	asm("skip_1");
	222	asm(" move.l a7,a0");
	223	asm(" subq.l #0x8,a7");
	224	asm(" move.l (a0),(a7)");
	225	asm(" move.l (a0),_argc_value");
	226	asm(" addq.l #0x4,a0");
	227	asm(" move.l a0,0x4(a7)");
	228	asm(" move.l a0,_argv_value");
	229	asm("incr_loop");
	230	asm(" tst.l (a0)+");
	231	asm(" bne.s incr_loop");
	232	asm(" move.l 0x4(a7),a1");
	233	asm(" cmp.l (a1),a0");
	234	asm(" blt.s skip_2");
	235	asm(" subq.l #0x4,a0");
	236	asm("skip_2");
	237	asm(" move.l a0,0x8(a7)");
	238	asm(" move.l a0,_environ");
	239	asm(" jsr _main");
	240	asm(" addq.l #0x8,a7");
	241	asm(" move.l d0,-(a7)");
	242	asm(" jsr _exit");
	243	asm(" move.w #0x1,d0");
	244	asm(" trap #0x0");
	245	asm(" comm float_soft,4");
	246	/* float_soft is allocated in this way because C would
	247	put an underscore character in its name otherwise. */
	248
	249	#else /* new hp assembler */
	250
	251	asm(" text");
	252	asm(" global float_loc");
	253	asm(" set float_loc,0xFFFFB000");
	254	asm(" global fpa_loc");
	255	asm(" set fpa_loc,0xfff08000");
	256	asm(" global __start");
	257	asm(" global _exit");
	258	asm(" global _main");
	259	asm("__start:");
	260	asm(" byte 0,0,0,0");
	261	asm(" subq.w &1,%d0");
262	asm(" mov.w %d0,float_soft");
263	asm(" mov.w %d1,flag_68881");
264	#ifndef HPUX_68010
265	asm(" beq.b skip_float");
266	asm(" fmov.l &0x7400,%fpcr");
267	/* asm(" fmov.l &0x7480,%fpcr"); */
268	#endif /* HPUX_68010 */
269	asm("skip_float:");
270	asm(" mov.l %a0,%d0");
271	asm(" add.l %d0,%d0");
272	asm(" subx.w %d1,%d1");
273	asm(" mov.w %d1,flag_68010");
274	asm(" add.l %d0,%d0");
275	asm(" subx.w %d1,%d1");
276	asm(" mov.w %d1,flag_fpa");
277	asm(" tst.l %d2");
278	asm(" ble.b skip_3");
279	asm(" lsl flag_68881");
280	asm(" lsl flag_fpa");
281	asm("skip_3:");
282	asm(" mov.l 4(%a7),%d0");
283	asm(" beq.b skip_1");
284	asm(" mov.l %d0,%a0");
285	asm(" clr.l -4(%a0)");
286	asm("skip_1:");
287	asm(" mov.l %a7,%a0");
288	asm(" subq.l &8,%a7");
289	asm(" mov.l (%a0),(%a7)");
290	asm(" mov.l (%a0),_argc_value");
291	asm(" addq.l &4,%a0");
292	asm(" mov.l %a0,4(%a7)");
293	asm(" mov.l %a0,_argv_value");
294	asm("incr_loop:");
295	asm(" tst.l (%a0)+");
296	asm(" bne.b incr_loop");
297	asm(" mov.l 4(%a7),%a1");
298	asm(" cmp.l %a0,(%a1)");
299	asm(" blt.b skip_2");
300	asm(" subq.l &4,%a0");
301	asm("skip_2:");
302	asm(" mov.l %a0,8(%a7)");
303	asm(" mov.l %a0,_environ");
304	asm(" jsr _main");
305	asm(" addq.l &8,%a7");
306	asm(" mov.l %d0,-(%a7)");
307	asm(" jsr _exit");
308	asm(" mov.w &1,%d0");
309	asm(" trap &0");
310	asm(" comm float_soft, 4");
311	asm(" comm flag_68881, 4");
312	asm(" comm flag_68010, 4");
313	asm(" comm flag_68040, 4");
314	asm(" comm flag_fpa, 4");
315
316	#endif /* new hp assembler */
317	#endif /* hp9000s300 */
318
b8098ef8 DL	319	#ifdef sparc
	320	asm (".global __start");
	321	asm (".text");
	322	asm ("__start:");
	323	asm (" mov 0, %fp");
	324	asm (" ld [%sp + 64], %o0");
	325	asm (" add %sp, 68, %o1");
	326	asm (" sll %o0, 2, %o2");
	327	asm (" add %o2, 4, %o2");
	328	asm (" add %o1, %o2, %o2");
	329	asm (" sethi %hi(_environ), %o3");
	330	asm (" st %o2, [%o3+%lo(_environ)]");
	331	asm (" andn %sp, 7, %sp");
	332	asm (" call _main");
	333	asm (" sub %sp, 24, %sp");
	334	asm (" call __exit");
	335	asm (" nop");
	336
	337	#endif /* sparc */
	338
	339	#if __FreeBSD__ == 2
	340	char *__progname;
	341	#endif
	342	#ifdef __bsdi__
	343	#include <sys/param.h> /* for version number */
	344	#if defined(_BSDI_VERSION) && (_BSDI_VERSION >= 199501)
	345	char *__progname;
	346	#endif
	347	#endif /* __bsdi__ */
ab5796a9 MB	348
	349	/* arch-tag: 4025c2fb-d6b1-4d29-b1b6-8100b6bd1e74
	350	(do not change this comment) */