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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_
.globl sfpucw_
.globl gfpucw_
# 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
gfpucw_: # Get fpucw: gfpucw_ (&cur_fpucw)
pushl %ebp
movl %esp,%ebp
subl $0x4,%esp
movl 0x8(%ebp), %eax
fnstcw 0xfffffffe(%ebp)
movw 0xfffffffe(%ebp), %dx
movl %edx,(%eax)
movl %ebp, %esp
popl %ebp
ret
sfpucw_: # Set fpucw: sfpucw_ (&new_fpucw)
pushl %ebp
movl %esp,%ebp
subl $0x4,%esp
movl 0x8(%ebp), %eax
movl (%eax), %eax
andl $0xf3f, %eax
fclex
movw %ax, 0xfffffffe(%ebp)
fldcw 0xfffffffe(%ebp)
leave
ret
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