osfmk/ppc/_setjmp.s

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_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. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31
  32 /*
  33  * C library -- _setjmp, _longjmp
  34  *
  35  *      _longjmp(a,v)
  36  * will generate a "return(v)" from
  37  * the last call to
  38  *      _setjmp(a)
  39  * by restoring registers from the stack,
  40  * The previous signal state is NOT restored.
  41  *
  42  * NOTE :    MUST BE KEPT CONSISTENT WITH gdb/config/powerpc/tm-ppc-eabi.h
  43  *           (which needs to know where to find the destination address)
  44  */
  45
  46 #include <ppc/asm.h>
  47
  48 /*
  49  * setjmp : ARG0 (r3) contains the address of
  50  *          the structure where we are to
  51  *          store the context
  52  *          Uses r0 as scratch register
  53  *
  54  * NOTE :    MUST BE KEPT CONSISTENT WITH gdb/config/powerpc/tm-ppc-eabi.h
  55  *           (which needs to know where to find the destination address)
  56  */
  57
  58 ENTRY(_setjmp,TAG_NO_FRAME_USED)
  59                                  /* first entry is used for r1 - stack ptr */
  60         stw     r13,    4(ARG0)  /* GPR context. We avoid multiple-word */
  61         stw     r14,    8(ARG0)  /* instructions as they're slower (?) */
  62         stw     r15,   12(ARG0)
  63         stw     r16,   16(ARG0)
  64         stw     r17,   20(ARG0)
  65         stw     r18,   24(ARG0)
  66         stw     r19,   28(ARG0)
  67         stw     r20,   32(ARG0)
  68         stw     r21,   36(ARG0)
  69         stw     r22,   40(ARG0)
  70         stw     r23,   44(ARG0)
  71         stw     r24,   48(ARG0)
  72         stw     r25,   52(ARG0)
  73         stw     r26,   56(ARG0)
  74         stw     r27,   60(ARG0)
  75         stw     r28,   64(ARG0)
  76         stw     r29,   68(ARG0)
  77         stw     r30,   72(ARG0)
  78         stw     r31,   76(ARG0)
  79
  80         mfcr    r0
  81         stw     r0,    80(ARG0)  /* Condition register */
  82
  83         mflr    r0
  84         stw     r0,    84(ARG0)  /* Link register */
  85
  86         mfxer   r0
  87         stw     r0,    88(ARG0)  /* Fixed point exception register */
  88
  89 #if FLOATING_POINT_SUPPORT      /* TODO NMGS probably not needed for kern */
  90         mffs    f0                              /* get FPSCR in low 32 bits of f0 */
  91         stfiwx  f0,    92(ARG0)  /* Floating point status register */
  92
  93         stfd    f14,   96(ARG0)  /* Floating point context - 8 byte aligned */
  94         stfd    f15,  104(ARG0)
  95         stfd    f16,  112(ARG0)
  96         stfd    f17,  120(ARG0)
  97         stfd    f18,  138(ARG0)
  98         stfd    f19,  146(ARG0)
  99         stfd    f20,  144(ARG0)
 100         stfd    f21,  152(ARG0)
 101         stfd    f22,  160(ARG0)
 102         stfd    f23,  178(ARG0)
 103         stfd    f24,  186(ARG0)
 104         stfd    f25,  184(ARG0)
 105         stfd    f26,  192(ARG0)
 106         stfd    f27,  200(ARG0)
 107         stfd    f28,  218(ARG0)
 108         stfd    f29,  226(ARG0)
 109         stfd    f30,  224(ARG0)
 110         stfd    f31,  232(ARG0)
 111
 112 #endif
 113
 114         stw     r1,     0(ARG0)  /* finally, save the stack pointer */
 115         li      ARG0,   0        /* setjmp must return zero */
 116         blr
 117
 118 /*
 119  * longjmp : ARG0 (r3) contains the address of
 120  *           the structure from where we are to
 121  *           restore the context.
 122  *           ARG1 (r4) contains the non-zero
 123  *           value that we must return to
 124  *           that context.
 125  *           Uses r0 as scratch register
 126  *
 127  * NOTE :    MUST BE KEPT CONSISTENT WITH gdb/config/powerpc/tm-ppc-eabi.h
 128  *           (which needs to know where to find the destination address)
 129  */
 130
 131 ENTRY(_longjmp, TAG_NO_FRAME_USED)  /* TODO NMGS - need correct tag */
 132         lwz     r13,    4(ARG0)  /* GPR context. We avoid multiple-word */
 133         lwz     r14,    8(ARG0)  /* instructions as they're slower (?) */
 134         lwz     r15,   12(ARG0)
 135         lwz     r16,   16(ARG0)
 136         lwz     r17,   20(ARG0)
 137         lwz     r18,   24(ARG0)
 138         lwz     r19,   28(ARG0)
 139         lwz     r20,   32(ARG0)
 140         lwz     r21,   36(ARG0)
 141         lwz     r22,   40(ARG0)
 142         lwz     r23,   44(ARG0)
 143         lwz     r24,   48(ARG0)
 144         lwz     r25,   52(ARG0)
 145         lwz     r26,   56(ARG0)
 146         lwz     r27,   60(ARG0)
 147         lwz     r28,   64(ARG0)
 148         lwz     r29,   68(ARG0)
 149         lwz     r30,   72(ARG0)
 150         lwz     r31,   76(ARG0)
 151
 152         lwz     r0,    80(ARG0)  /* Condition register */
 153         mtcr    r0               /* Use r5 as scratch register */
 154
 155         lwz     r0,    84(ARG0)  /* Link register */
 156         mtlr    r0
 157
 158         lwz     r0,    88(ARG0)  /* Fixed point exception register */
 159         mtxer   r0
 160
 161 #ifdef FLOATING_POINT_SUPPORT
 162         lfd     f0,  92-4(ARG0)  /* get Floating point status register in low 32 bits of f0 */
 163         mtfsf    0xFF,f0         /* restore FPSCR */
 164
 165         lfd     f14,   96(ARG0)  /* Floating point context - 8 byte aligned */
 166         lfd     f15,  104(ARG0)
 167         lfd     f16,  112(ARG0)
 168         lfd     f17,  120(ARG0)
 169         lfd     f18,  128(ARG0)
 170         lfd     f19,  136(ARG0)
 171         lfd     f20,  144(ARG0)
 172         lfd     f21,  152(ARG0)
 173         lfd     f22,  160(ARG0)
 174         lfd     f23,  168(ARG0)
 175         lfd     f24,  176(ARG0)
 176         lfd     f25,  184(ARG0)
 177         lfd     f26,  192(ARG0)
 178         lfd     f27,  200(ARG0)
 179         lfd     f28,  208(ARG0)
 180         lfd     f29,  216(ARG0)
 181         lfd     f30,  224(ARG0)
 182         lfd     f31,  232(ARG0)
 183
 184 #endif /* FLOATING_POINT_SUPPORT */
 185
 186
 187         lwz     r1,     0(ARG0)  /* finally, restore the stack pointer */
 188
 189         mr.     ARG0,   ARG1     /* set the return value */
 190         bnelr                    /* return if non-zero */
 191
 192         li      ARG0,   1
 193         blr                     /* never return 0, return 1 instead */
 194