From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Wed, 8 Jul 2015 20:46:52 -0400
Subject: Initial commit

---
 unix/as.linux/zsvjmp.s.OLD | 61 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 unix/as.linux/zsvjmp.s.OLD

(limited to 'unix/as.linux/zsvjmp.s.OLD')

diff --git a/unix/as.linux/zsvjmp.s.OLD b/unix/as.linux/zsvjmp.s.OLD
new file mode 100644
index 00000000..01c26e58
--- /dev/null
+++ b/unix/as.linux/zsvjmp.s.OLD
@@ -0,0 +1,61 @@
+	.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_
+        .globl	setfpucw
+
+	# 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]
+	movl 	$0, (%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
+
+setfpucw:
+	pushl  %ebp
+	movl   %esp,%ebp
+	subl   $0x4,%esp
+	movl   0x8(%ebp),%eax
+	fnstcw 0xfffffffe(%ebp)
+	movw   0xfffffffe(%ebp),%dx
+	andl   $0xfffff0c0,%edx
+	andl   $0xf3f,%eax
+	orl    %eax,%edx
+	movw   %dx,0xfffffffe(%ebp)
+	fldcw  0xfffffffe(%ebp)
+	leave  
+	ret    
-- 
cgit