1 /* $NetBSD: __setjmp14.S,v 1.3 2003/10/07 17:08:07 skd 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.
30 #include <machine/asm.h>
34 * C library -- setjmp, longjmp
37 * will generate a "return(v)" from
40 * by restoring registers from the stack,
41 * and the previous signal state.
48 stq ra, SC_PC(a0) /* sc_pc = return address */
49 stq s0, (SC_REGS+_REG_S0)(a0) /* saved bits of sc_regs */
50 stq s1, (SC_REGS+_REG_S1)(a0)
51 stq s2, (SC_REGS+_REG_S2)(a0)
52 stq s3, (SC_REGS+_REG_S3)(a0)
53 stq s4, (SC_REGS+_REG_S4)(a0)
54 stq s5, (SC_REGS+_REG_S5)(a0)
55 stq s6, (SC_REGS+_REG_S6)(a0)
56 stq ra, (SC_REGS+_REG_RA)(a0)
57 stq sp, (SC_REGS+_REG_SP)(a0)
60 * get signal information
62 mov a0, s0 /* squirrel away ptr to sc */
64 /* see what's blocked */
65 mov zero, a0 /* how (insignificant) */
66 mov zero, a1 /* set (NULL) */
67 lda a2, SC_MASK(s0) /* point to mask in sc */
70 lda sp, -24(sp) /* sizeof struct sigaltstack */
74 ldl t0, 16(sp) /* offset of ss_flags */
75 lda sp, 24(sp) /* sizeof struct sigaltstack */
76 ldq ra, (SC_REGS+_REG_RA)(s0) /* restore return address */
77 blt v0, botch /* check for error */
78 and t0, 0x1, t0 /* get SA_ONSTACK flag */
79 stq t0, SC_ONSTACK(s0) /* and save it in sc_onstack */
81 * Restore old s0 and a0, and continue saving registers
84 ldq s0, (SC_REGS+_REG_S0)(a0)
86 ldiq t0, 0xacedbade /* sigcontext magic number */
87 stq t0, (SC_REGS+_REG_UNIQUE)(a0) /* magic in sc_regs[31] */
88 /* Too bad we can't check if we actually used FP */
90 stq t0, SC_OWNEDFP(a0) /* say we've used FP. */
91 stt fs0, (2*8 + SC_FPREGS)(a0) /* saved bits of sc_fpregs */
92 stt fs1, (3*8 + SC_FPREGS)(a0)
93 stt fs2, (4*8 + SC_FPREGS)(a0)
94 stt fs3, (5*8 + SC_FPREGS)(a0)
95 stt fs4, (6*8 + SC_FPREGS)(a0)
96 stt fs5, (7*8 + SC_FPREGS)(a0)
97 stt fs6, (8*8 + SC_FPREGS)(a0)
98 stt fs7, (9*8 + SC_FPREGS)(a0)
99 mf_fpcr ft0 /* get FP control reg */
100 stt ft0, SC_FPCR(a0) /* and store it in sc_fpcr */
101 stq zero, SC_FP_CONTROL(a0) /* FP software control XXX */
102 stq zero, (SC_RESERVED + 0*8)(a0) /* sc_reserved[0] */
103 stq zero, (SC_RESERVED + 1*8)(a0) /* sc_reserved[1] */
104 stq zero, (SC_XXX + 0*8)(a0) /* sc_xxx[0] */
105 stq zero, (SC_XXX + 1*8)(a0) /* sc_xxx[1] */
106 stq zero, (SC_XXX + 2*8)(a0) /* sc_xxx[2] */
107 stq zero, (SC_XXX + 3*8)(a0) /* sc_xxx[3] */
108 stq zero, (SC_XXX + 4*8)(a0) /* sc_xxx[4] */
109 stq zero, (SC_XXX + 5*8)(a0) /* sc_xxx[5] */
110 stq zero, (SC_XXX + 6*8)(a0) /* sc_xxx[6] */
111 stq zero, (SC_XXX + 7*8)(a0) /* sc_xxx[7] */
113 mov zero, v0 /* return zero */
117 RET /* "can't" get here... */