_setjmp.S revision 71579 
1/*	$NetBSD: _setjmp.S,v 1.2 1996/10/17 03:08:03 cgd Exp $	*/
2/* $FreeBSD: head/lib/libc/ia64/gen/_setjmp.S 71579 2001-01-24 13:01:12Z deischen $ */
3
4/*
5 * Copyright (c) 1994, 1995 Carnegie-Mellon University.
6 * All rights reserved.
7 *
8 * Author: Chris G. Demetriou
9 *
10 * Permission to use, copy, modify and distribute this software and
11 * its documentation is hereby granted, provided that both the copyright
12 * notice and this permission notice appear in all copies of the
13 * software, derivative works or modified versions, and any portions
14 * thereof, and that both notices appear in supporting documentation.
15 *
16 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
17 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
18 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
19 *
20 * Carnegie Mellon requests users of this software to return to
21 *
22 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
23 *  School of Computer Science
24 *  Carnegie Mellon University
25 *  Pittsburgh PA 15213-3890
26 *
27 * any improvements or extensions that they make and grant Carnegie the
28 * rights to redistribute these changes.
29 *
30 * $FreeBSD: head/lib/libc/ia64/gen/_setjmp.S 71579 2001-01-24 13:01:12Z deischen $
31 */
32
33#include <machine/asm.h>
34
35/*
36 * C library -- _setjmp, _longjmp
37 *
38 *	_longjmp(a,v)
39 * will generate a "return(v)" from
40 * the last call to
41 *	_setjmp(a)
42 * by restoring registers from the stack,
43 * The previous signal state is NOT restored.
44 */
45
46ENTRY(_setjmp, 1)
47	mov	ret0=r0
48	br.ret.sptk.few rp
49#if 0
50	LDGP(pv)
51	stq	ra, (2 * 8)(a0)			/* sc_pc = return address */
52	stq	s0, (( 9 + 4) * 8)(a0)		/* saved bits of sc_regs */
53	stq	s1, ((10 + 4) * 8)(a0)
54	stq	s2, ((11 + 4) * 8)(a0)
55	stq	s3, ((12 + 4) * 8)(a0)
56	stq	s4, ((13 + 4) * 8)(a0)
57	stq	s5, ((14 + 4) * 8)(a0)
58	stq	s6, ((15 + 4) * 8)(a0)
59	stq	ra, ((26 + 4) * 8)(a0)
60	stq	sp, ((30 + 4) * 8)(a0)
61	ldiq	t0, 0xacedbadd			/* sigcontext magic number */
62	stq	t0, ((31 + 4) * 8)(a0)		/* magic in sc_regs[31] */
63	/* Too bad we can't check if we actually used FP */
64	ldiq	t0, 1
65	stq	t0, (36 * 8)(a0)		/* say we've used FP.  */
66	stt	fs0, ((2 + 37) * 8)(a0)		/* saved bits of sc_fpregs */
67	stt	fs1, ((3 + 37) * 8)(a0)
68	stt	fs2, ((4 + 37) * 8)(a0)
69	stt	fs3, ((5 + 37) * 8)(a0)
70	stt	fs4, ((6 + 37) * 8)(a0)
71	stt	fs5, ((7 + 37) * 8)(a0)
72	stt	fs6, ((8 + 37) * 8)(a0)
73	stt	fs7, ((9 + 37) * 8)(a0)
74	mf_fpcr ft0				/* get FP control reg */
75	stt	ft0, (69 * 8)(a0)		/* and store it in sc_fpcr */
76	stq	zero, (70 * 8)(a0)		/* FP software control XXX */
77	stq	zero, (71 * 8)(a0)		/* sc_reserved[0] */
78	stq	zero, (72 * 8)(a0)		/* sc_reserved[1] */
79	stq	zero, (73 * 8)(a0)		/* sc_xxx[0] */
80	stq	zero, (74 * 8)(a0)		/* sc_xxx[1] */
81	stq	zero, (75 * 8)(a0)		/* sc_xxx[2] */
82	stq	zero, (76 * 8)(a0)		/* sc_xxx[3] */
83	stq	zero, (77 * 8)(a0)		/* sc_xxx[4] */
84	stq	zero, (78 * 8)(a0)		/* sc_xxx[5] */
85	stq	zero, (79 * 8)(a0)		/* sc_xxx[6] */
86	stq	zero, (80 * 8)(a0)		/* sc_xxx[7] */
87
88	mov	zero, v0			/* return zero */
89	RET
90#endif
91END(_setjmp)
92
93XENTRY(_longjmp)
94ENTRY(___longjmp, 2)
95#if 0
96	LDGP(pv)
97	ldq	t0, ((31 + 4) * 8)(a0)		/* magic in sc_regs[31] */
98	ldiq	t1, 0xacedbadd
99	cmpeq	t0, t1, t0
100	beq	t0, botch			/* If the magic was bad, punt */
101
102	ldq	ra, (2 * 8)(a0)			/* sc_pc = return address */
103	ldq	s0, (( 9 + 4) * 8)(a0)		/* saved bits of sc_regs */
104	ldq	s1, ((10 + 4) * 8)(a0)
105	ldq	s2, ((11 + 4) * 8)(a0)
106	ldq	s3, ((12 + 4) * 8)(a0)
107	ldq	s4, ((13 + 4) * 8)(a0)
108	ldq	s5, ((14 + 4) * 8)(a0)
109	ldq	s6, ((15 + 4) * 8)(a0)
110	/* ldq	ra, ((26 + 4) * 8)(a0)		set above */
111	ldq	sp, ((30 + 4) * 8)(a0)
112	ldt	fs0, ((2 + 37) * 8)(a0)		/* saved bits of sc_fpregs */
113	ldt	fs1, ((3 + 37) * 8)(a0)
114	ldt	fs2, ((4 + 37) * 8)(a0)
115	ldt	fs3, ((5 + 37) * 8)(a0)
116	ldt	fs4, ((6 + 37) * 8)(a0)
117	ldt	fs5, ((7 + 37) * 8)(a0)
118	ldt	fs6, ((8 + 37) * 8)(a0)
119	ldt	fs7, ((9 + 37) * 8)(a0)
120	ldt	ft0, (69 * 8)(a0)		/* get sc_fpcr */
121	mt_fpcr	ft0				/* and restore it. */
122
123	mov	a1, v0				/* return second arg */
124	RET
125
126botch:
127	CALL(longjmperror)
128	CALL(abort)
129	RET					/* "can't" get here... */
130#endif
131END(___longjmp)
132