libgcc/config/rs6000/darwin-gpsave.S

   1 /*  This file contains the GPR save and restore routines for Darwin.
   2  *
   3  *   Copyright (C) 2011-2018 Free Software Foundation, Inc.
   4  *
   5  * This file is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 3, or (at your option) any
   8  * later version.
   9  *
  10  * This file is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * Under Section 7 of GPL version 3, you are granted additional
  16  * permissions described in the GCC Runtime Library Exception, version
  17  * 3.1, as published by the Free Software Foundation.
  18  *
  19  * You should have received a copy of the GNU General Public License and
  20  * a copy of the GCC Runtime Library Exception along with this program;
  21  * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  22  * <http://www.gnu.org/licenses/>.
  23  */
  24
  25 /* Contributed by Iain Sandoe  <iains@gcc.gnu.org> */
  26
  27 /* Like their FP and VEC counterparts, these routines have only one externally
  28    visible entry point.  Calls have to be constructed as offsets from this.
  29    (I.E. callers have to jump to "saveGPR+((x-13)*4" to save registers x..31).
  30
  31    Each save/load instruction is 4 bytes long (for both m32 and m64 builds).
  32
  33    The save/restores here are done w.r.t r11.
  34
  35    restGPRx restores the link reg from the stack and returns to the saved
  36    address.
  37
  38    */
  39
  40 #include "darwin-asm.h"
  41
  42         .text
  43         .align 2
  44
  45         .private_extern saveGPR
  46 saveGPR:
  47         stg r13,(-19 * GPR_BYTES)(r11)
  48         stg r14,(-18 * GPR_BYTES)(r11)
  49         stg r15,(-17 * GPR_BYTES)(r11)
  50         stg r16,(-16 * GPR_BYTES)(r11)
  51         stg r17,(-15 * GPR_BYTES)(r11)
  52         stg r18,(-14 * GPR_BYTES)(r11)
  53         stg r19,(-13 * GPR_BYTES)(r11)
  54         stg r20,(-12 * GPR_BYTES)(r11)
  55         stg r21,(-11 * GPR_BYTES)(r11)
  56         stg r22,(-10 * GPR_BYTES)(r11)
  57         stg r23,( -9 * GPR_BYTES)(r11)
  58         stg r24,( -8 * GPR_BYTES)(r11)
  59         stg r25,( -7 * GPR_BYTES)(r11)
  60         stg r26,( -6 * GPR_BYTES)(r11)
  61         stg r27,( -5 * GPR_BYTES)(r11)
  62         stg r28,( -4 * GPR_BYTES)(r11)
  63         stg r29,( -3 * GPR_BYTES)(r11)
  64         stg r30,( -2 * GPR_BYTES)(r11)
  65         stg r31,( -1 * GPR_BYTES)(r11)
  66         blr
  67
  68 /* */
  69
  70         .private_extern restGPR
  71 restGPR:
  72         lg r13,(-19 * GPR_BYTES)(r11)
  73         lg r14,(-18 * GPR_BYTES)(r11)
  74         lg r15,(-17 * GPR_BYTES)(r11)
  75         lg r16,(-16 * GPR_BYTES)(r11)
  76         lg r17,(-15 * GPR_BYTES)(r11)
  77         lg r18,(-14 * GPR_BYTES)(r11)
  78         lg r19,(-13 * GPR_BYTES)(r11)
  79         lg r20,(-12 * GPR_BYTES)(r11)
  80         lg r21,(-11 * GPR_BYTES)(r11)
  81         lg r22,(-10 * GPR_BYTES)(r11)
  82         lg r23,( -9 * GPR_BYTES)(r11)
  83         lg r24,( -8 * GPR_BYTES)(r11)
  84         lg r25,( -7 * GPR_BYTES)(r11)
  85         lg r26,( -6 * GPR_BYTES)(r11)
  86         lg r27,( -5 * GPR_BYTES)(r11)
  87         lg r28,( -4 * GPR_BYTES)(r11)
  88         lg r29,( -3 * GPR_BYTES)(r11)
  89         lg r30,( -2 * GPR_BYTES)(r11)
  90         lg r31,( -1 * GPR_BYTES)(r11)
  91         blr
  92
  93         .private_extern restGPRx
  94 restGPRx:
  95         lg r13,(-19 * GPR_BYTES)(r11)
  96         lg r14,(-18 * GPR_BYTES)(r11)
  97         lg r15,(-17 * GPR_BYTES)(r11)
  98         lg r16,(-16 * GPR_BYTES)(r11)
  99         lg r17,(-15 * GPR_BYTES)(r11)
 100         lg r18,(-14 * GPR_BYTES)(r11)
 101         lg r19,(-13 * GPR_BYTES)(r11)
 102         lg r20,(-12 * GPR_BYTES)(r11)
 103         lg r21,(-11 * GPR_BYTES)(r11)
 104         lg r22,(-10 * GPR_BYTES)(r11)
 105         lg r23,( -9 * GPR_BYTES)(r11)
 106         lg r24,( -8 * GPR_BYTES)(r11)
 107         lg r25,( -7 * GPR_BYTES)(r11)
 108         lg r26,( -6 * GPR_BYTES)(r11)
 109         lg r27,( -5 * GPR_BYTES)(r11)
 110         lg r28,( -4 * GPR_BYTES)(r11)
 111         lg r29,( -3 * GPR_BYTES)(r11)
 112         /* Like the FP restore, we start from the offset for r30
 113            thus a restore of only r31 is not going to work.  */
 114         lg r0,SAVED_LR_OFFSET(r1)
 115         lg r30,( -2 * GPR_BYTES)(r11)
 116         mtlr r0
 117         lg r31,( -1 * GPR_BYTES)(r11)
 118         blr