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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 FreeBSD (x86) version of ZSVJMP.
+# Modified to remove leading underscore for ELF (Jan99).
+ 
+        .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
+	.globl	_mem_
+	_mem_	=	0
+
+# 	*status = 0;
+# 	buf[0] = &status;
+# 	setjmp (&buf[1]);
+
+	.text
+_zsvjmp_:
+	movl	4(%esp), %edx	# &jmpbuf to EDX
+	movl	8(%esp), %eax	# &status to EAX
+	movl	%eax, (%edx)	# store value-of &status in &jmpbuf[0]
+	movl	$0, (%eax)	# zero the value of status
+	addl	$4, %edx	# change stack to point to &jmpbuf[1]
+	movl	%edx, 4(%esp)
+	jmp	L_setjmp$stub
+	leave
+	ret
+	.section __IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5
+L_setjmp$stub:
+	.indirect_symbol _setjmp
+	hlt ; hlt ; hlt ; hlt ; hlt
+	.subsections_via_symbols