src/setjmp/arm/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) 1998-2008 Apple Inc. All rights reserved.
  25  *
  26  *      File: sys/arm/longjmp.s
  27  *
  28  *      Implements siglongjmp(), longjmp(), _longjmp()
  29  *
  30  */
  31
  32 #include <architecture/arm/asm_help.h>
  33 #include "_setjmp.h"
  34
  35 /*
  36  *      longjmp routines
  37  */
  38
  39 /*      void siglongjmp(sigjmp_buf env, int val); */
  40
  41 ENTRY_POINT(_siglongjmp)
  42         ldr     r2, [ r0, #JMP_SIGFLAG ]        //  load sigflag
  43         cmp     r2, #0                          // test if zero
  44         beq     L__exit                         // if zero do _longjmp()
  45         // else *** fall through *** to longjmp()
  46
  47 /*      void longjmp(jmp_buf env, int val); */
  48
  49 ENTRY_POINT(_longjmp)
  50 #ifdef __ARM_ARCH_7K__
  51         sub sp, sp, #16                                 // armv7k stack is 16-byte aligned.
  52 #else
  53         sub sp, sp, #4
  54 #endif
  55         mov     r6, r0                                          // preserve args across _sigprocmask
  56         mov     r8, r1
  57         ldr     r0, [ r6, #JMP_sig ]            // restore the signal mask
  58         mov     r1, sp                                          // set
  59         str     r0, [sp]
  60         movs    r0, #3                                  // SIG_SETMASK
  61         movs    r2, #0                                  // oset
  62         CALL_EXTERNAL(_sigprocmask)
  63         mov     r0, r6
  64         mov     r1, r8
  65 #ifdef __ARM_ARCH_7K__
  66         add sp, sp, #16                                 // armv7k stack is 16-byte aligned.
  67 #else
  68         add sp, sp, #4
  69 #endif
  70 L__exit:
  71         BRANCH_EXTERNAL(__longjmp)