libsa/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 <mach/machine/asm.h>
  47
  48 .private_extern _longjmp
  49 .private_extern _setjmp
  50
  51 /*
  52  * setjmp : ARG0 (r3) contains the address of
  53  *          the structure where we are to
  54  *          store the context
  55  *          Uses r0 as scratch register
  56  *
  57  * NOTE :    MUST BE KEPT CONSISTENT WITH gdb/config/powerpc/tm-ppc-eabi.h
  58  *           (which needs to know where to find the destination address)
  59  */
  60
  61 ENTRY(setjmp,TAG_NO_FRAME_USED)
  62                                  /* first entry is used for r1 - stack ptr */
  63         stw     r13,    4(ARG0)  /* GPR context. We avoid multiple-word */
  64         stw     r14,    8(ARG0)  /* instructions as they're slower (?) */
  65         stw     r15,   12(ARG0)
  66         stw     r16,   16(ARG0)
  67         stw     r17,   20(ARG0)
  68         stw     r18,   24(ARG0)
  69         stw     r19,   28(ARG0)
  70         stw     r20,   32(ARG0)
  71         stw     r21,   36(ARG0)
  72         stw     r22,   40(ARG0)
  73         stw     r23,   44(ARG0)
  74         stw     r24,   48(ARG0)
  75         stw     r25,   52(ARG0)
  76         stw     r26,   56(ARG0)
  77         stw     r27,   60(ARG0)
  78         stw     r28,   64(ARG0)
  79         stw     r29,   68(ARG0)
  80         stw     r30,   72(ARG0)
  81         stw     r31,   76(ARG0)
  82
  83         mfcr    r0
  84         stw     r0,    80(ARG0)  /* Condition register */
  85
  86         mflr    r0
  87         stw     r0,    84(ARG0)  /* Link register */
  88
  89         mfxer   r0
  90         stw     r0,    88(ARG0)  /* Fixed point exception register */
  91
  92 #if FLOATING_POINT_SUPPORT      /* TODO NMGS probably not needed for kern */
  93         mffs    f0                              /* get FPSCR in low 32 bits of f0 */
  94         stfiwx  f0,    92(ARG0)  /* Floating point status register */
  95
  96         stfd    f14,   96(ARG0)  /* Floating point context - 8 byte aligned */
  97         stfd    f15,  104(ARG0)
  98         stfd    f16,  112(ARG0)
  99         stfd    f17,  120(ARG0)
 100         stfd    f18,  138(ARG0)
 101         stfd    f19,  146(ARG0)
 102         stfd    f20,  144(ARG0)
 103         stfd    f21,  152(ARG0)
 104         stfd    f22,  160(ARG0)
 105         stfd    f23,  178(ARG0)
 106         stfd    f24,  186(ARG0)
 107         stfd    f25,  184(ARG0)
 108         stfd    f26,  192(ARG0)
 109         stfd    f27,  200(ARG0)
 110         stfd    f28,  218(ARG0)
 111         stfd    f29,  226(ARG0)
 112         stfd    f30,  224(ARG0)
 113         stfd    f31,  232(ARG0)
 114
 115 #endif
 116
 117         stw     r1,     0(ARG0)  /* finally, save the stack pointer */
 118         li      ARG0,   0        /* setjmp must return zero */
 119         blr
 120
 121 /*
 122  * longjmp : ARG0 (r3) contains the address of
 123  *           the structure from where we are to
 124  *           restore the context.
 125  *           ARG1 (r4) contains the non-zero
 126  *           value that we must return to
 127  *           that context.
 128  *           Uses r0 as scratch register
 129  *
 130  * NOTE :    MUST BE KEPT CONSISTENT WITH gdb/config/powerpc/tm-ppc-eabi.h
 131  *           (which needs to know where to find the destination address)
 132  */
 133
 134 ENTRY(longjmp, TAG_NO_FRAME_USED)  /* TODO NMGS - need correct tag */
 135         lwz     r13,    4(ARG0)  /* GPR context. We avoid multiple-word */
 136         lwz     r14,    8(ARG0)  /* instructions as they're slower (?) */
 137         lwz     r15,   12(ARG0)
 138         lwz     r16,   16(ARG0)
 139         lwz     r17,   20(ARG0)
 140         lwz     r18,   24(ARG0)
 141         lwz     r19,   28(ARG0)
 142         lwz     r20,   32(ARG0)
 143         lwz     r21,   36(ARG0)
 144         lwz     r22,   40(ARG0)
 145         lwz     r23,   44(ARG0)
 146         lwz     r24,   48(ARG0)
 147         lwz     r25,   52(ARG0)
 148         lwz     r26,   56(ARG0)
 149         lwz     r27,   60(ARG0)
 150         lwz     r28,   64(ARG0)
 151         lwz     r29,   68(ARG0)
 152         lwz     r30,   72(ARG0)
 153         lwz     r31,   76(ARG0)
 154
 155         lwz     r0,    80(ARG0)  /* Condition register */
 156         mtcr    r0               /* Use r5 as scratch register */
 157
 158         lwz     r0,    84(ARG0)  /* Link register */
 159         mtlr    r0
 160
 161         lwz     r0,    88(ARG0)  /* Fixed point exception register */
 162         mtxer   r0
 163
 164 #ifdef FLOATING_POINT_SUPPORT
 165         lfd     f0,  92-4(ARG0)  /* get Floating point status register in low 32 bits of f0 */
 166         mtfsf    0xFF,f0         /* restore FPSCR */
 167
 168         lfd     f14,   96(ARG0)  /* Floating point context - 8 byte aligned */
 169         lfd     f15,  104(ARG0)
 170         lfd     f16,  112(ARG0)
 171         lfd     f17,  120(ARG0)
 172         lfd     f18,  128(ARG0)
 173         lfd     f19,  136(ARG0)
 174         lfd     f20,  144(ARG0)
 175         lfd     f21,  152(ARG0)
 176         lfd     f22,  160(ARG0)
 177         lfd     f23,  168(ARG0)
 178         lfd     f24,  176(ARG0)
 179         lfd     f25,  184(ARG0)
 180         lfd     f26,  192(ARG0)
 181         lfd     f27,  200(ARG0)
 182         lfd     f28,  208(ARG0)
 183         lfd     f29,  216(ARG0)
 184         lfd     f30,  224(ARG0)
 185         lfd     f31,  232(ARG0)
 186
 187 #endif /* FLOATING_POINT_SUPPORT */
 188
 189
 190         lwz     r1,     0(ARG0)  /* finally, restore the stack pointer */
 191
 192         mr.     ARG0,   ARG1     /* set the return value */
 193         bnelr                    /* return if non-zero */
 194
 195         li      ARG0,   1
 196         blr                     /* never return 0, return 1 instead */
 197