ppc/sys/longjmp.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/longjmp.s
  29  *
  30  *      Implements siglongjmp(), longjmp(), _longjmp()
  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 /* We use mode-independent "g" opcodes such as "stg", and/or
  40  * mode-independent macros such as MI_GET_ADDRESS.  These expand
  41  * into word operations when targeting __ppc__, and into doubleword
  42  * operations when targeting __ppc64__.
  43  */
  44 #include <architecture/ppc/mode_independent_asm.h>
  45
  46 #include "SYS.h"
  47 #include "_setjmp.h"
  48
  49 /*
  50  *      longjmp routines
  51  */
  52
  53 /*      void siglongjmp(sigjmp_buf env, int val); */
  54
  55 MI_ENTRY_POINT(_siglongjmp)
  56         lg      r0, JMP_SIGFLAG(r3)     ; load sigflag saved by siglongjmp()
  57         cmpgi   cr1,r0,0                        ; this changes cr1 which is volatile
  58         beq--   cr1, L__exit        ; if r0 == 0 do _longjmp()
  59         ; else *** fall through *** to longjmp()
  60
  61 /*      void longjmp(jmp_buf env, int val); */
  62
  63 MI_ENTRY_POINT(_longjmp)
  64         mr      r30, r3             ; preserve args across _sigsetmask
  65         mr      r31, r4
  66
  67     /* NB: this code assumes the signal mask is an int.  Change the "lwz" below
  68      * if not. The JMP_sig field is already 8 bytes in the jmpbuf.
  69      */
  70         lwz     r3, JMP_sig(r3)         ; restore the signal mask
  71         MI_CALL_EXTERNAL(_sigsetmask)   // make a (deprecated!) syscall to set the mask
  72         mr      r4, r31
  73         mr      r3, r30
  74 L__exit:
  75         MI_BRANCH_EXTERNAL(__longjmp)