ppc/sys/longjmp.s

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Copyright (c) 1998 Apple Computer, Inc. All rights reserved.
  25  *
  26  *      File: sys/ppc/longjmp.s
  27  *
  28  *      Implements siglongjmp(), longjmp(), _longjmp()
  29  *
  30  *      NOTE:   Scatterloading this file will BREAK the functions.
  31  *
  32  *      History:
  33  *      30-Aug-1998     Umesh Vaishampayan      (umeshv@apple.com)
  34  *              Created. Derived from _setjmp.s, setjmp.c and setjmp.s
  35  */
  36
  37 #include "SYS.h"
  38 #include <architecture/ppc/asm_help.h>
  39 #include "_setjmp.h"
  40
  41 /*
  42  *      longjmp routines
  43  */
  44
  45 /*      void siglongjmp(sigjmp_buf env, int val); */
  46
  47 LEAF(_siglongjmp)
  48         lwz r0, JMP_SIGFLAG(r3) ; load sigflag saved by siglongjmp()
  49         cmpwi cr1,r0,0                  ; this changes cr1[EQ] which is volatile
  50         beq- cr1, L__longjmp    ; if r0 == 0 do _longjmp()
  51         ; else *** fall through *** to longjmp()
  52
  53 /*      void longjmp(jmp_buf env, int val); */
  54
  55 LEAF(_longjmp)
  56 L_longjmp:
  57         mr r30, r3
  58         mr r31, r4
  59         lwz r3, JMP_sig(r3)             ; restore the signal mask
  60         CALL_EXTERN(_sigsetmask)
  61         mr r4, r31
  62         mr r3, r30
  63 L__longjmp:
  64         BRANCH_EXTERN(__longjmp)