ppc/sys/setjmp.s

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1998 Apple Computer, Inc. All rights reserved.
  27  *
  28  *      File: sys/ppc/setjmp.s
  29  *
  30  *      Implements sigsetjmp(), setjmp(), _setjmp()
  31  *
  32  *      NOTE:   Scatterloading this file will BREAK the functions.
  33  *
  34  *      History:
  35  *      30-Aug-1998     Umesh Vaishampayan      (umeshv@apple.com)
  36  *              Created. Derived from _setjmp.s, setjmp.c and setjmp.s
  37  */
  38
  39 #include "SYS.h"
  40 #include <architecture/ppc/asm_help.h>
  41 #include "_setjmp.h"
  42
  43 /*
  44  * setjmp  routines
  45  */
  46
  47 /*      int sigsetjmp(sigjmp_buf env, int savemask); */
  48
  49 LEAF(_sigsetjmp)
  50         cmpwi cr1,r4,0                  ; this changes cr1[EQ] which is volatile
  51         stw r4, JMP_SIGFLAG(r3) ; save the sigflag for use by siglongjmp()
  52         beq- cr1, L__setjmp             ; if r4 == 0 do _setjmp()
  53         ; else *** fall through ***  to setjmp()
  54
  55 /*      int setjmp(jmp_buf env); */
  56
  57 LEAF(_setjmp)
  58 L_setjmp:
  59         mflr r0
  60         stw r31, JMP_r31(r3)
  61         stw r0, JMP_lr(r3)
  62         mr r31, r3
  63         li r3, 0                                ; get the previous signal mask
  64         CALL_EXTERN(_sigblock)
  65         stw r3, JMP_sig(r31)    ; save the previous mask
  66         mr r3, r31
  67         lwz r0, JMP_lr(r3)
  68         mtlr r0
  69         lwz r31, JMP_r31(r3)
  70 L__setjmp:
  71         BRANCH_EXTERN(__setjmp)