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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
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