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      1 /* $NetBSD: compat_setjmp.S,v 1.3 2021/05/25 00:14:41 thorpej Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1994, 1995 Carnegie-Mellon University.
      5  * All rights reserved.
      6  *
      7  * Author: Chris G. Demetriou
      8  *
      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.
     14  *
     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.
     18  *
     19  * Carnegie Mellon requests users of this software to return to
     20  *
     21  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  *  School of Computer Science
     23  *  Carnegie Mellon University
     24  *  Pittsburgh PA 15213-3890
     25  *
     26  * any improvements or extensions that they make and grant Carnegie the
     27  * rights to redistribute these changes.
     28  */
     29 
     30 #include <machine/asm.h>
     31 
     32 /*
     33  * C library -- setjmp, longjmp
     34  *
     35  *	longjmp(a,v)
     36  * will generate a "return(v)" from
     37  * the last call to
     38  *	setjmp(a)
     39  * by restoring registers from the stack,
     40  * and the previous signal state.
     41  */
     42 
     43 	.set	noreorder
     44 
     45 LEAF(setjmp, 1)
     46 	LDGP(pv)
     47 	stq	ra, (2 * 8)(a0)			/* sc_pc = return address */
     48 	stq	s0, (( 9 + 4) * 8)(a0)		/* saved bits of sc_regs */
     49 	stq	s1, ((10 + 4) * 8)(a0)
     50 	stq	s2, ((11 + 4) * 8)(a0)
     51 	stq	s3, ((12 + 4) * 8)(a0)
     52 	stq	s4, ((13 + 4) * 8)(a0)
     53 	stq	s5, ((14 + 4) * 8)(a0)
     54 	stq	s6, ((15 + 4) * 8)(a0)
     55 	stq	ra, ((26 + 4) * 8)(a0)
     56 	stq	sp, ((30 + 4) * 8)(a0)
     57 
     58 	/*
     59 	 * get signal information
     60 	 */
     61 	mov	a0, s0				/* squirrel away ptr to sc */
     62 
     63 	/* see what's blocked */
     64 	mov	zero, a0
     65 	CALL(sigblock)				/* see what's blocked */
     66 	stq	v0, (1 * 8)(s0)			/* and remember it in sc_mask */
     67 
     68 	lda	sp, -24(sp)			/* sizeof struct sigaltstack */
     69 	mov	zero, a0
     70 	mov	sp, a1
     71 	CALL(__sigaltstack14)
     72 	ldl	t0, 16(sp)			/* offset of ss_flags */
     73 	lda	sp, 24(sp)			/* sizeof struct sigaltstack */
     74 	ldq	ra, ((26 + 4) * 8)(s0)		/* restore return address */
     75 	blt	v0, botch			/* check for error */
     76 	and	t0, 0x1, t0			/* get SA_ONSTACK flag */
     77 	stq	t0, (0 * 8)(s0)			/* and save it in sc_onstack */
     78 	/*
     79 	 * Restore old s0 and a0, and continue saving registers
     80 	 */
     81 	mov	s0, a0
     82 	ldq	s0, (( 9 + 4) * 8)(a0)
     83 
     84 	ldq	t0, magic 			/* sigcontext magic number */
     85 	stq	t0, ((31 + 4) * 8)(a0)		/* magic in sc_regs[31] */
     86 	/* Too bad we can't check if we actually used FP */
     87 	ldiq	t0, 1
     88 	stq	t0, (36 * 8)(a0)		/* say we've used FP.  */
     89 	stt	fs0, ((2 + 37) * 8)(a0)		/* saved bits of sc_fpregs */
     90 	stt	fs1, ((3 + 37) * 8)(a0)
     91 	stt	fs2, ((4 + 37) * 8)(a0)
     92 	stt	fs3, ((5 + 37) * 8)(a0)
     93 	stt	fs4, ((6 + 37) * 8)(a0)
     94 	stt	fs5, ((7 + 37) * 8)(a0)
     95 	stt	fs6, ((8 + 37) * 8)(a0)
     96 	stt	fs7, ((9 + 37) * 8)(a0)
     97 	mf_fpcr	ft0				/* get FP control reg */
     98 	stt	ft0, (69 * 8)(a0)		/* and store it in sc_fpcr */
     99 	stq	zero, (70 * 8)(a0)		/* FP software control XXX */
    100 	stq	zero, (71 * 8)(a0)		/* sc_reserved[0] */
    101 	stq	zero, (72 * 8)(a0)		/* sc_reserved[1] */
    102 	stq	zero, (73 * 8)(a0)		/* sc_xxx[0] */
    103 	stq	zero, (74 * 8)(a0)		/* sc_xxx[1] */
    104 	stq	zero, (75 * 8)(a0)		/* sc_xxx[2] */
    105 	stq	zero, (76 * 8)(a0)		/* sc_xxx[3] */
    106 	stq	zero, (77 * 8)(a0)		/* sc_xxx[4] */
    107 	stq	zero, (78 * 8)(a0)		/* sc_xxx[5] */
    108 	stq	zero, (79 * 8)(a0)		/* sc_xxx[6] */
    109 	stq	zero, (80 * 8)(a0)		/* sc_xxx[7] */
    110 
    111 	mov	zero, v0			/* return zero */
    112 	RET
    113 END(setjmp)
    114 
    115 LEAF(longjmp, 2)
    116 	LDGP(pv)
    117 	bne	a1, 1f				/* val != 0, just go */
    118 	ldiq	a1, 1				/* val = 1 otherwise */
    119 1:	stq	a1, (( 0 + 4) * 8)(a0)		/* save return value */
    120 	CALL(sigreturn)				/* use sigreturn to return */
    121 
    122 botch:
    123 	CALL(longjmperror)
    124 	CALL(abort)
    125 	RET					/* "can't" get here... */
    126 magic:
    127 	.quad	0xacedbade			/* sigcontext magic number */
    128 END(longjmp)
    129