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+	.file	"zsvjmp.s"
+
+/# ZSVJMP, ZDOJMP -- Set up a jump (non-local goto) by saving the processor
+/# registers in the buffer jmpbuf.  A subsequent call to ZDOJMP restores
+/# the registers, effecting a call in the context of the procedure which
+/# originally called ZSVJMP, but with the new status code.  These are Fortran
+/# callable procedures.
+/#
+/#		zsvjmp (jmp_buf, status)	# (returns status)
+/#		zdojmp (jmp_buf, status)	# (passes status to zsvjmp)
+/#
+/# These routines are directly comparable to the UNIX setjmp/longjmp, except
+/# that they are Fortran callable kernel routines, i.e., trailing underscore,
+/# call by reference, and no function returns.  ZSVJMP requires an assembler
+/# jacket routine to avoid modifying the call stack, but relies upon setjmp
+/# to do the real work.  ZDOJMP is implemented as a portable C routine in OS,
+/# calling longjmp to do the restore.  In these routines, JMP_BUF consists
+/# of one longword containing the address of the STATUS variable, followed
+/# by the "jmp_buf" used by setjmp/longjmp.
+/#
+/# This file contains the SUN/UNIX 386i (80386) version of ZSVJMP.
+ 
+        .globl	zsvjmp_
+
+	/# The following has nothing to do with ZSVJMP, and is included here
+	/# only because this assembler module is loaded with every process.
+	/# This code sets the value of the symbol MEM (the VOS or Fortran Mem
+	/# common) to zero, setting the origin for IRAF pointers to zero
+	/# rather than some arbitrary value, and ensuring that the MEM common
+	/# is aligned for all datatypes as well as page aligned.  A further
+	/# advantage is that references to NULL pointers are likely to cause a
+	/# memory violation.
+
+	.globl	mem_
+	mem_	=	0
+
+	.text
+zsvjmp_:
+	movl	4(%esp), %ecx		/# &jmpbuf to ECX
+	movl	8(%esp), %eax		/# &status to EAX
+	movl	%eax, (%ecx)		/# store &status in jmpbuf[0]
+	clrl	(%eax)			/# zero the value of status
+	addl	$4, %ecx		/# change stack to point to &jmpbuf[1]
+	movl	%ecx, 4(%esp)		/# 	...
+	jmp	setjmp			/# let setjmp do the rest