1 /* $NetBSD: setjmp.S,v 1.3 1997/12/05 02:06:27 thorpej Exp $ */
4 * Copyright (c) 1994, 1995 Carnegie-Mellon University.
7 * Author: Chris G. Demetriou
9 * Permission to use, copy, modify and distribute this software and
10 * its documentation is hereby granted, provided that both the copyright
11 * notice and this permission notice appear in all copies of the
12 * software, derivative works or modified versions, and any portions
13 * thereof, and that both notices appear in supporting documentation.
15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
19 * Carnegie Mellon requests users of this software to return to
21 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
22 * School of Computer Science
23 * Carnegie Mellon University
24 * Pittsburgh PA 15213-3890
26 * any improvements or extensions that they make and grant Carnegie the
27 * rights to redistribute these changes.
29 * $FreeBSD: src/lib/libc/alpha/gen/setjmp.S,v 1.11.2.3 2002/11/13 06:08:44 fjoe Exp $
35 * C library -- setjmp, longjmp
38 * will generate a "return(v)" from
41 * by restoring registers from the stack,
42 * and the previous signal state.
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 t12,((27 + 4) * 8)(a0)
59 stq sp, ((30 + 4) * 8)(a0)
62 * get signal information
64 mov a0, s0 /* squirrel away ptr to sc */
66 /* see what's blocked */
67 lda a2, (71 * 8)(a0) /* oset: sc_reserved */
68 mov zero, a1 /* set: NULL */
69 addq a1, 1, a0 /* how: SIG_BLOCK */
70 PCALL(sigprocmask) /* see what's blocked */
72 lda sp, -24(sp) /* sizeof struct sigaltstack */
76 ldl t0, 16(sp) /* offset of ss_flags */
77 lda sp, 24(sp) /* sizeof struct sigaltstack */
78 ldq ra, ((26 + 4) * 8)(s0) /* restore return address */
79 blt v0, botch /* check for error */
80 and t0, 0x1, t0 /* get SA_ONSTACK flag */
81 stq t0, (0 * 8)(s0) /* and save it in sc_onstack */
83 * Restore old s0 and a0, and continue saving registers
86 ldq s0, (( 9 + 4) * 8)(a0)
88 ldiq t0, 0xacedbade /* sigcontext magic number */
89 stq t0, ((31 + 4) * 8)(a0) /* magic in sc_regs[31] */
90 /* Too bad we can't check if we actually used FP */
92 stq t0, (36 * 8)(a0) /* say we've used FP. */
93 stt fs0, ((2 + 37) * 8)(a0) /* saved bits of sc_fpregs */
94 stt fs1, ((3 + 37) * 8)(a0)
95 stt fs2, ((4 + 37) * 8)(a0)
96 stt fs3, ((5 + 37) * 8)(a0)
97 stt fs4, ((6 + 37) * 8)(a0)
98 stt fs5, ((7 + 37) * 8)(a0)
99 stt fs6, ((8 + 37) * 8)(a0)
100 stt fs7, ((9 + 37) * 8)(a0)
101 mf_fpcr ft0 /* get FP control reg */
102 stt ft0, (69 * 8)(a0) /* and store it in sc_fpcr */
103 stq zero, (70 * 8)(a0) /* FP software control XXX */
104 stq zero, (71 * 8)(a0) /* sc_reserved[0] */
105 stq zero, (72 * 8)(a0) /* sc_reserved[1] */
106 stq zero, (73 * 8)(a0) /* sc_xxx[0] */
107 stq zero, (74 * 8)(a0) /* sc_xxx[1] */
108 stq zero, (75 * 8)(a0) /* sc_xxx[2] */
109 stq zero, (76 * 8)(a0) /* sc_xxx[3] */
110 stq zero, (77 * 8)(a0) /* sc_xxx[4] */
111 stq zero, (78 * 8)(a0) /* sc_xxx[5] */
112 stq zero, (79 * 8)(a0) /* sc_xxx[6] */
113 stq zero, (80 * 8)(a0) /* sc_xxx[7] */
115 mov zero, v0 /* return zero */
126 stq a1, (( 0 + 4) * 8)(a0) /* save return value */
127 CALL(sigreturn) /* use sigreturn to return */
132 RET /* "can't" get here... */