1999-08-28 01:08:13 +00:00
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/* $FreeBSD$ */
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1999-07-28 20:28:47 +00:00
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/*
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* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#include <machine/asm.h>
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.text
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/*
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* Kernel setjmp and longjmp. Rather minimalist.
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*
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* longjmp(label_t *a)
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* will generate a "return (1)" from the last call to
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* setjmp(label_t *a)
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* by restoring registers from the stack,
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*/
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.set noreorder
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LEAF(setjmp, 1)
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LDGP(pv)
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stq ra, (0 * 8)(a0) /* return address */
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stq s0, (1 * 8)(a0) /* callee-saved registers */
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stq s1, (2 * 8)(a0)
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stq s2, (3 * 8)(a0)
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stq s3, (4 * 8)(a0)
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stq s4, (5 * 8)(a0)
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stq s5, (6 * 8)(a0)
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stq s6, (7 * 8)(a0)
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stq sp, (8 * 8)(a0)
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ldiq t0, 0xbeeffedadeadbabe /* set magic number */
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stq t0, (9 * 8)(a0)
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mov zero, v0 /* return zero */
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RET
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END(setjmp)
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LEAF(longjmp, 1)
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LDGP(pv)
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ldiq t0, 0xbeeffedadeadbabe /* check magic number */
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ldq t1, (9 * 8)(a0)
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cmpeq t0, t1, t0
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beq t0, longjmp_botch /* if bad, punt */
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ldq ra, (0 * 8)(a0) /* return address */
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ldq s0, (1 * 8)(a0) /* callee-saved registers */
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ldq s1, (2 * 8)(a0)
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ldq s2, (3 * 8)(a0)
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ldq s3, (4 * 8)(a0)
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ldq s4, (5 * 8)(a0)
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ldq s5, (6 * 8)(a0)
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ldq s6, (7 * 8)(a0)
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ldq sp, (8 * 8)(a0)
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ldiq v0, 1
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RET
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longjmp_botch:
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lda a0, longjmp_botchmsg
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mov ra, a1
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CALL(panic)
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call_pal PAL_bugchk
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.data
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longjmp_botchmsg:
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.asciz "longjmp botch from %p"
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.text
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END(longjmp)
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