> Has anyone written a siglongjmp() for libc, yet?  I've run into more 
 > than a few things that want to use it.  Especially packages that 
 > assume that because they are configured on a NetBSD system, siglongjmp()
 > exists and works.

Note that you never really *need* sigsetjmp/siglongjmp, since you
can always replace with setjmp/longjmp or _setjmp/_longjmp according
to the 'save signal mask' argument to sigsetjmp.  However, since we
just had this on the PMAX port I've done a first cut of a VAX
implementation.  Since I don't know anything about VAX assembly
language, someone should check these out, but they *do* pass the
regression test, for whatever that's worth.

I'm quite unsure about how the stack frame handling works -  my guess
is that sigsetjmp can do the maximum save from setjmp /_setjmp
(max[R6,0] = R6), then jump directly into the routines.
There is probably a nicer way to express this direct jump than my
	jmp	_setjmp+2
hack, too...

  - Arne H. J.

/*
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#if defined(LIBC_SCCS) && !defined(lint)
	.asciz "$NetBSD$"
#endif /* LIBC_SCCS and not lint */

/*
 * C library -- sigsetjmp, siglongjmp
 *
 *      siglongjmp(a,v)
 * will generate a "return(v)" from
 * the last call to
 *      sigsetjmp(a, savemask)
 * by restoring registers from the stack,
 * and dependent on savemask restores the
 * signal mask.
 */

#include "DEFS.h"
#include <machine/setjmp.h>

ENTRY(sigsetjmp, R6)
	movl	4(ap),r0		# get env pointer
	movl	8(ap),(_JBLEN*4)(r0)	# save "savemask"
	tstl	8(ap)			# do saving of signal mask?
	beql	L1
	jmp	_setjmp+2		# yep, do full setjmp
L1:	jmp	__setjmp+2		# nope, skip to _setjmp

ENTRY(siglongjmp, 0)
	movl	4(ap),r0		# get env pointer
	tstl	(_JBLEN*4)(r0)		# test if "savemask" was set
	beql	L2
	jmp	_longjmp+2		# yep, do full longjmp
L2:	jmp	__longjmp+2		# nope, skip to _longjmp