ports/sysdeps/unix/sysv/linux/hppa/setcontext.S

   1 /* Install given context.
   2    Copyright (C) 2008-2013 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Helge Deller <deller@gmx.de>, 2008.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library.  If not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <sysdep.h>
  21
  22 #include "ucontext_i.h"
  23
  24
  25 ENTRY(__setcontext)
  26         /* Prologue */
  27         stwm    %r3, 64(%sp)
  28 #ifdef PIC
  29         stw     %r19, -32(%sp)
  30 #endif
  31
  32         /* Save ucp.  */
  33         copy    %r26, %r3
  34
  35 .Lagain:
  36         /* Set the current signal mask.  */
  37         /* sigprocmask(SIG_BLOCK, &ucp->uc_sigmask, NULL);  */
  38         copy    %r0, %r24
  39         ldo     oSIGMASK(%r3), %r25
  40         bl      sigprocmask, %r2
  41         ldi     SIG_SETMASK, %r26
  42
  43         comib,<>,n 0,%ret0,.Lerror
  44
  45         /* Save %sp, %dp.  */
  46         copy    %sp, %r4
  47         copy    %dp, %r5
  48         copy    %r19, %r6
  49
  50         /* Get the registers.  */
  51         ldw     oR1(%r3), %r1
  52         ldw     oR2(%r3), %r2
  53         /* ldw  oR3(%r3), %r3 - used for ucp pointer.   */
  54         /* ldw  oR4(%r3), %r4 - used for original %sp.  */
  55         /* ldw  oR5(%r3), %r5 - used for %dp / %r27.    */
  56         /* ldw  oR6(%r3), %r6 - used for %r19.          */
  57         ldw     oR7(%r3), %r7
  58         ldw     oR8(%r3), %r8
  59         ldw     oR9(%r3), %r9
  60         ldw     oR10(%r3), %r10
  61         ldw     oR11(%r3), %r11
  62         ldw     oR12(%r3), %r12
  63         ldw     oR13(%r3), %r13
  64         ldw     oR14(%r3), %r14
  65         ldw     oR15(%r3), %r15
  66         ldw     oR16(%r3), %r16
  67         ldw     oR17(%r3), %r17
  68         ldw     oR18(%r3), %r18
  69         ldw     oR19(%r3), %r19
  70         ldw     oR20(%r3), %r20
  71         ldw     oR21(%r3), %r21
  72         /* ldw  oR22(%r3), %r22 - dyncall arg.  */
  73         ldw     oR23(%r3), %r23
  74         ldw     oR24(%r3), %r24
  75         ldw     oR25(%r3), %r25
  76         ldw     oR26(%r3), %r26
  77         ldw     oR27(%r3), %r27
  78         ldw     oR28(%r3), %r28
  79         ldw     oR29(%r3), %r29
  80         ldw     oR30(%r3), %sp
  81         /* ldw  oR31(%r3), %r31 - dyncall scratch register */
  82
  83         /* Restore floating-point registers.  */
  84         ldo      oFPREGS31(%r3), %r22
  85         fldds     0(%r22), %fr31
  86         fldds,mb -8(%r22), %fr30
  87         fldds,mb -8(%r22), %fr29
  88         fldds,mb -8(%r22), %fr28
  89         fldds,mb -8(%r22), %fr27
  90         fldds,mb -8(%r22), %fr26
  91         fldds,mb -8(%r22), %fr25
  92         fldds,mb -8(%r22), %fr24
  93         fldds,mb -8(%r22), %fr23
  94         fldds,mb -8(%r22), %fr22
  95         fldds,mb -8(%r22), %fr21
  96         fldds,mb -8(%r22), %fr20
  97         fldds,mb -8(%r22), %fr19
  98         fldds,mb -8(%r22), %fr18
  99         fldds,mb -8(%r22), %fr17
 100         fldds,mb -8(%r22), %fr16
 101         fldds,mb -8(%r22), %fr15
 102         fldds,mb -8(%r22), %fr14
 103         fldds,mb -8(%r22), %fr13
 104         fldds,mb -8(%r22), %fr12
 105         fldds,mb -8(%r22), %fr11
 106         fldds,mb -8(%r22), %fr10
 107         fldds,mb -8(%r22), %fr9
 108         fldds,mb -8(%r22), %fr8
 109         fldds,mb -8(%r22), %fr7
 110         fldds,mb -8(%r22), %fr6
 111         fldds,mb -8(%r22), %fr5
 112         fldds,mb -8(%r22), %fr4
 113         fldds,mb -8(%r22), %fr3
 114         fldds,mb -8(%r22), %fr2
 115         fldds,mb -8(%r22), %fr1
 116         fldds,mb -8(%r22), %fr0
 117
 118         /* Do not load oSS_SP into %sp. The value of oSS_SP indicates
 119            the start of the user allocated stack, but not the sp that
 120            should be used by the new context. In fact makecontext
 121            will create a frame, and adjust sp as required. We do not
 122            support calling getcontext and modifying ss_sp without
 123            a call to makecontext to synchronize ss_sp into the machine
 124            context.  */
 125
 126         /* Call external function.  */
 127         copy    %r2, %r22
 128         bl      $$dyncall, %r31
 129         copy    %r31, %r2
 130
 131         /* We return here. Get new ucp in %r3, reload %sp.  */
 132         ldw     oUC_LINK(%r3), %r3
 133         copy    %r4, %sp
 134         copy    %r5, %dp
 135         copy    %r6, %r19
 136
 137         /* Continue until ucp == NULL.  */
 138         comib,<> 0,%r3,.Lagain
 139         nop
 140
 141         /* No further context available. Exit now.  */
 142         bl      _exit, %r2
 143         ldi     -1, %r26
 144
 145
 146 .Lerror:
 147         /* Epilogue */
 148         ldw     -84(%r30), %r2
 149 #ifdef PIC
 150         ldw     -96(%r30), %r19
 151 #endif
 152         bv      %r0(%r2)
 153         ldwm    -64(%r30), %r3
 154 L(pseudo_end):
 155 PSEUDO_END(__setcontext)
 156
 157 weak_alias(__setcontext, setcontext)