FreeBSD/Linux Kernel Cross Reference
sys/osfmk/ppc/_setjmp.s

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    /*
     * @OSF_COPYRIGHT@
     */
    
    /*
     * C library -- _setjmp, _longjmp
     *
     *      _longjmp(a,v)
     * will generate a "return(v)" from
     * the last call to
     *      _setjmp(a)
     * by restoring registers from the stack,
     * The previous signal state is NOT restored.
     *
     * NOTE :    MUST BE KEPT CONSISTENT WITH gdb/config/powerpc/tm-ppc-eabi.h
     *           (which needs to know where to find the destination address)
     */
    
    #include <ppc/asm.h>
    
    /*
     * setjmp : ARG0 (r3) contains the address of
     *          the structure where we are to
     *          store the context
     *          Uses r0 as scratch register
     *
     * NOTE :    MUST BE KEPT CONSISTENT WITH gdb/config/powerpc/tm-ppc-eabi.h
     *           (which needs to know where to find the destination address)
     */     
    
    ENTRY(_setjmp,TAG_NO_FRAME_USED)
                                     /* first entry is used for r1 - stack ptr */
            stw     r13,    4(ARG0)  /* GPR context. We avoid multiple-word */
            stw     r14,    8(ARG0)  /* instructions as they're slower (?) */
            stw     r15,   12(ARG0) 
            stw     r16,   16(ARG0) 
            stw     r17,   20(ARG0) 
            stw     r18,   24(ARG0) 
            stw     r19,   28(ARG0) 
            stw     r20,   32(ARG0) 
            stw     r21,   36(ARG0) 
            stw     r22,   40(ARG0) 
            stw     r23,   44(ARG0) 
            stw     r24,   48(ARG0) 
            stw     r25,   52(ARG0) 
            stw     r26,   56(ARG0) 
            stw     r27,   60(ARG0) 
            stw     r28,   64(ARG0) 
            stw     r29,   68(ARG0) 
            stw     r30,   72(ARG0) 
            stw     r31,   76(ARG0) 
    
            mfcr    r0
            stw     r0,    80(ARG0)  /* Condition register */
    
            mflr    r0
            stw     r0,    84(ARG0)  /* Link register */
    
            mfxer   r0
            stw     r0,    88(ARG0)  /* Fixed point exception register */
    
    #if FLOATING_POINT_SUPPORT      /* TODO NMGS probably not needed for kern */ 
            mffs    r0
            stw     r0,    92(ARG0)  /* Floating point status register */
    
            stfd    f14,   96(ARG0)  /* Floating point context - 8 byte aligned */
            stfd    f15,  104(ARG0)
            stfd    f16,  112(ARG0)
            stfd    f17,  120(ARG0)
            stfd    f18,  138(ARG0)
            stfd    f19,  146(ARG0)
            stfd    f20,  144(ARG0)
            stfd    f21,  152(ARG0)
            stfd    f22,  160(ARG0)
            stfd    f23,  178(ARG0)
           stfd    f24,  186(ARG0)
           stfd    f25,  184(ARG0)
           stfd    f26,  192(ARG0)
           stfd    f27,  200(ARG0)
           stfd    f28,  218(ARG0)
           stfd    f29,  226(ARG0)
           stfd    f30,  224(ARG0)
           stfd    f31,  232(ARG0)
   
   #endif
   
           stw     r1,     0(ARG0)  /* finally, save the stack pointer */
           li      ARG0,   0        /* setjmp must return zero */
           blr
   
   /*
    * longjmp : ARG0 (r3) contains the address of
    *           the structure from where we are to
    *           restore the context.
    *           ARG1 (r4) contains the non-zero
    *           value that we must return to
    *           that context.
    *           Uses r0 as scratch register
    *
    * NOTE :    MUST BE KEPT CONSISTENT WITH gdb/config/powerpc/tm-ppc-eabi.h
    *           (which needs to know where to find the destination address)
    */     
   
   ENTRY(_longjmp, TAG_NO_FRAME_USED)  /* TODO NMGS - need correct tag */ 
           lwz     r13,    4(ARG0)  /* GPR context. We avoid multiple-word */
           lwz     r14,    8(ARG0)  /* instructions as they're slower (?) */
           lwz     r15,   12(ARG0) 
           lwz     r16,   16(ARG0) 
           lwz     r17,   20(ARG0) 
           lwz     r18,   24(ARG0) 
           lwz     r19,   28(ARG0) 
           lwz     r20,   32(ARG0) 
           lwz     r21,   36(ARG0) 
           lwz     r22,   40(ARG0) 
           lwz     r23,   44(ARG0) 
           lwz     r24,   48(ARG0) 
           lwz     r25,   52(ARG0) 
           lwz     r26,   56(ARG0) 
           lwz     r27,   60(ARG0) 
           lwz     r28,   64(ARG0) 
           lwz     r29,   68(ARG0) 
           lwz     r30,   72(ARG0) 
           lwz     r31,   76(ARG0) 
   
           lwz     r0,    80(ARG0)  /* Condition register */
           mtcr    r0               /* Use r5 as scratch register */
   
           lwz     r0,    84(ARG0)  /* Link register */
           mtlr    r0
   
           lwz     r0,    88(ARG0)  /* Fixed point exception register */
           mtxer   r0
   
   #ifdef FLOATING_POINT_SUPPORT
           lwz     r0,    92(ARG0)  /* Floating point status register */
           mtfs    r0
   
           lfd     f14,   96(ARG0)  /* Floating point context - 8 byte aligned */
           lfd     f15,  104(ARG0)
           lfd     f16,  112(ARG0)
           lfd     f17,  120(ARG0)
           lfd     f18,  128(ARG0)
           lfd     f19,  136(ARG0)
           lfd     f20,  144(ARG0)
           lfd     f21,  152(ARG0)
           lfd     f22,  160(ARG0)
           lfd     f23,  168(ARG0)
           lfd     f24,  176(ARG0)
           lfd     f25,  184(ARG0)
           lfd     f26,  192(ARG0)
           lfd     f27,  200(ARG0)
           lfd     f28,  208(ARG0)
           lfd     f29,  216(ARG0)
           lfd     f30,  224(ARG0)
           lfd     f31,  232(ARG0)
   
   #endif /* FLOATING_POINT_SUPPORT */
           
   
           lwz     r1,     0(ARG0)  /* finally, restore the stack pointer */
   
           mr.     ARG0,   ARG1     /* set the return value */
           bnelr                    /* return if non-zero */
   
           li      ARG0,   1
           blr                     /* never return 0, return 1 instead */
   

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