sys.subproj/ppc.subproj/setjmp.s

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1998 Apple Computer, Inc. All rights reserved.
  24  *
  25  *      File: sys/ppc/setjmp.s
  26  *
  27  *      Implements sigsetjmp(), setjmp(), _setjmp()
  28  *
  29  *      NOTE:   Scatterloading this file will BREAK the functions.
  30  *
  31  *      History:
  32  *      30-Aug-1998     Umesh Vaishampayan      (umeshv@apple.com)
  33  *              Created. Derived from _setjmp.s, setjmp.c and setjmp.s
  34  */
  35
  36 #include "SYS.h"
  37 #include <architecture/ppc/asm_help.h>
  38 #include "_setjmp.h"
  39
  40 /*
  41  * setjmp  routines
  42  */
  43
  44 /*      int sigsetjmp(sigjmp_buf env, int savemask); */
  45
  46 LEAF(_sigsetjmp)
  47         cmpwi cr1,r4,0                  ; this changes cr1[EQ] which is volatile
  48         stw r4, JMP_SIGFLAG(r3) ; save the sigflag for use by siglongjmp()
  49         beq- cr1, L__setjmp             ; if r4 == 0 do _setjmp()
  50         ; else *** fall through ***  to setjmp()
  51
  52 /*      int setjmp(jmp_buf env); */
  53
  54 LEAF(_setjmp)
  55 L_setjmp:
  56         mflr r0
  57         stw r31, JMP_r31(r3)
  58         stw r0, JMP_lr(r3)
  59         mr r31, r3
  60         li r3, 0                                ; get the previous signal mask
  61         CALL_EXTERN(_sigblock)
  62         stw r3, JMP_sig(r31)    ; save the previous mask
  63         mr r3, r31
  64         lwz r0, JMP_lr(r3)
  65         mtlr r0
  66         lwz r31, JMP_r31(r3)
  67 L__setjmp:
  68         BRANCH_EXTERN(__setjmp)