setjmp.S revision 67117 
1/*	$NetBSD: setjmp.S,v 1.3 1997/12/05 02:06:27 thorpej Exp $	*/
2/* $FreeBSD: head/lib/libc/ia64/gen/setjmp.S 67117 2000-10-14 17:01:12Z dfr $ */
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 67117 2000-10-14 17:01:12Z dfr $
31 */
32
33#include "SYS.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 * and the previous signal state.
44 */
45
46ENTRY(setjmp, 1)
47#if 0
48	LDGP(pv)
49	stq	ra, (2 * 8)(a0)			/* sc_pc = return address */
50	stq	s0, (( 9 + 4) * 8)(a0)		/* saved bits of sc_regs */
51	stq	s1, ((10 + 4) * 8)(a0)
52	stq	s2, ((11 + 4) * 8)(a0)
53	stq	s3, ((12 + 4) * 8)(a0)
54	stq	s4, ((13 + 4) * 8)(a0)
55	stq	s5, ((14 + 4) * 8)(a0)
56	stq	s6, ((15 + 4) * 8)(a0)
57	stq	ra, ((26 + 4) * 8)(a0)
58	stq	sp, ((30 + 4) * 8)(a0)
59
60	/*
61	 * get signal information
62	 */
63	mov	a0, s0				/* squirrel away ptr to sc */
64
65	/* see what's blocked */
66	lda	a2, (71 * 8)(a0)		/* oset: sc_reserved */
67	mov	zero, a1			/* set:	 NULL */
68	addq	a1, 1, a0			/* how:	 SIG_BLOCK */
69	PCALL(sigprocmask)			/* see what's blocked */
70
71	lda	sp, -24(sp)			/* sizeof struct sigaltstack */
72	mov	zero, a0
73	mov	sp, a1
74	PCALL(sigaltstack)
75	ldl	t0, 16(sp)			/* offset of ss_flags */
76	lda	sp, 24(sp)			/* sizeof struct sigaltstack */
77	ldq	ra, ((26 + 4) * 8)(s0)		/* restore return address */
78	blt	v0, botch			/* check for error */
79	and	t0, 0x1, t0			/* get SA_ONSTACK flag */
80	stq	t0, (0 * 8)(s0)			/* and save it in sc_onstack */
81	/*
82	 * Restore old s0 and a0, and continue saving registers
83	 */
84	mov	s0, a0
85	ldq	s0, (( 9 + 4) * 8)(a0)
86
87	ldiq	t0, 0xacedbade			/* sigcontext magic number */
88	stq	t0, ((31 + 4) * 8)(a0)		/* magic in sc_regs[31] */
89	/* Too bad we can't check if we actually used FP */
90	ldiq	t0, 1
91	stq	t0, (36 * 8)(a0)		/* say we've used FP.  */
92	stt	fs0, ((2 + 37) * 8)(a0)		/* saved bits of sc_fpregs */
93	stt	fs1, ((3 + 37) * 8)(a0)
94	stt	fs2, ((4 + 37) * 8)(a0)
95	stt	fs3, ((5 + 37) * 8)(a0)
96	stt	fs4, ((6 + 37) * 8)(a0)
97	stt	fs5, ((7 + 37) * 8)(a0)
98	stt	fs6, ((8 + 37) * 8)(a0)
99	stt	fs7, ((9 + 37) * 8)(a0)
100	mf_fpcr	ft0				/* get FP control reg */
101	stt	ft0, (69 * 8)(a0)		/* and store it in sc_fpcr */
102	stq	zero, (70 * 8)(a0)		/* FP software control XXX */
103	stq	zero, (71 * 8)(a0)		/* sc_reserved[0] */
104	stq	zero, (72 * 8)(a0)		/* sc_reserved[1] */
105	stq	zero, (73 * 8)(a0)		/* sc_xxx[0] */
106	stq	zero, (74 * 8)(a0)		/* sc_xxx[1] */
107	stq	zero, (75 * 8)(a0)		/* sc_xxx[2] */
108	stq	zero, (76 * 8)(a0)		/* sc_xxx[3] */
109	stq	zero, (77 * 8)(a0)		/* sc_xxx[4] */
110	stq	zero, (78 * 8)(a0)		/* sc_xxx[5] */
111	stq	zero, (79 * 8)(a0)		/* sc_xxx[6] */
112	stq	zero, (80 * 8)(a0)		/* sc_xxx[7] */
113
114	mov	zero, v0			/* return zero */
115	RET
116#endif
117END(setjmp)
118
119#ifdef _THREAD_SAFE
120ENTRY(__longjmp, 2)
121#else
122XENTRY(__longjmp)
123ENTRY(longjmp, 2)
124#endif
125#if 0
126	LDGP(pv)
127	stq	a1, (( 0 + 4) * 8)(a0)		/* save return value */
128	PCALL(sigreturn)			/* use sigreturn to return */
129
130botch:
131	CALL(longjmperror)
132	CALL(abort)
133	RET					/* "can't" get here... */
134#endif
135#ifdef _THREAD_SAFE
136END(__longjmp)
137#else
138END(longjmp)
139#endif
140