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