sysdeps/unix/sysv/linux/sh/sh4/swapcontext.S

   1 /* Save current context and install the given one.
   2    Copyright (C) 2005 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <sysdep.h>
  21
  22 #include "ucontext_i.h"
  23
  24 /*  int __swapcontext (ucontext_t *ouc, const ucontext_t *uc);  */
  25
  26         .text
  27         .align  5
  28 ENTRY(__swapcontext)
  29
  30         /* Return value of getcontext.  R0 is the only register whose
  31            value is not preserved.  */
  32         mov     #0, r0
  33         mov.l   r0, @(oR0,r4)
  34         mov.l   r1, @(oR1,r4)
  35         mov.l   r2, @(oR2,r4)
  36         mov.l   r3, @(oR3,r4)
  37         mov.l   r4, @(oR4,r4)
  38         mov.l   r5, @(oR5,r4)
  39         mov.l   r6, @(oR6,r4)
  40         mov.l   r7, @(oR7,r4)
  41         mov     r4, r0
  42         add     #(oMACL+4), r0
  43         sts.l   macl, @-r0
  44         sts.l   mach, @-r0
  45         stc.l   gbr, @-r0
  46
  47         /* Save T flag to SR.  */
  48         movt    r1
  49         mov.l   r1, @-r0
  50         sts.l   pr, @-r0
  51
  52         /* The return address of getcontext is the restart pc.  */
  53         sts.l   pr, @-r0
  54
  55         mov.l   r15, @-r0
  56         mov.l   r14, @-r0
  57         mov.l   r13, @-r0
  58         mov.l   r12, @-r0
  59         mov.l   r11, @-r0
  60         mov.l   r10, @-r0
  61         mov.l   r9, @-r0
  62         mov.l   r8, @-r0
  63
  64         mov     r4, r0
  65         /* We need 2 add instruction because oFPUL+4 >= 127.  */
  66         add     #124,r0
  67         add     #(oFPUL+4-124),r0
  68         sts.l   fpul, @-r0
  69         sts.l   fpscr, @-r0
  70         frchg
  71         fmov.s  fr15, @-r0
  72         fmov.s  fr14, @-r0
  73         fmov.s  fr13, @-r0
  74         fmov.s  fr12, @-r0
  75         fmov.s  fr11, @-r0
  76         fmov.s  fr10, @-r0
  77         fmov.s  fr9, @-r0
  78         fmov.s  fr8, @-r0
  79         fmov.s  fr7, @-r0
  80         fmov.s  fr6, @-r0
  81         fmov.s  fr5, @-r0
  82         fmov.s  fr4, @-r0
  83         fmov.s  fr3, @-r0
  84         fmov.s  fr2, @-r0
  85         fmov.s  fr1, @-r0
  86         fmov.s  fr0, @-r0
  87         frchg
  88         fmov.s  fr15, @-r0
  89         fmov.s  fr14, @-r0
  90         fmov.s  fr13, @-r0
  91         fmov.s  fr12, @-r0
  92         fmov.s  fr11, @-r0
  93         fmov.s  fr10, @-r0
  94         fmov.s  fr9, @-r0
  95         fmov.s  fr8, @-r0
  96         fmov.s  fr7, @-r0
  97         fmov.s  fr6, @-r0
  98         fmov.s  fr5, @-r0
  99         fmov.s  fr4, @-r0
 100         fmov.s  fr3, @-r0
 101         fmov.s  fr2, @-r0
 102         fmov.s  fr1, @-r0
 103         fmov.s  fr0, @-r0
 104
 105         mov     r5, r8
 106
 107         /* sigprocmask (SIG_SETMASK, &uc->uc_sigmask, &ouc->uc_sigmask).  */
 108         mov     #oSIGMASK, r1
 109         extu.b  r1, r1
 110         add     r1, r5
 111         mov     r4, r6
 112         add     r1, r6
 113         mov     #SIG_SETMASK, r4
 114         mov     #+SYS_ify(sigprocmask), r3
 115         trapa   #0x13
 116         mov     r0, r1
 117         mov     #-12, r2
 118         shad    r2, r1
 119         not     r1, r1                  // r1=0 means r0 = -1 to -4095
 120         tst     r1, r1                  // i.e. error in linux
 121         bf      .Lswapcontext_restore
 122 .Lsyscall_error:
 123         SYSCALL_ERROR_HANDLER
 124 .Lpseudo_end:
 125         rts
 126          nop
 127 .Lswapcontext_restore:
 128         mov     r8, r0
 129         add     #(oFR0),r0
 130         fmov.s  @r0+, fr0
 131         fmov.s  @r0+, fr1
 132         fmov.s  @r0+, fr2
 133         fmov.s  @r0+, fr3
 134         fmov.s  @r0+, fr4
 135         fmov.s  @r0+, fr5
 136         fmov.s  @r0+, fr6
 137         fmov.s  @r0+, fr7
 138         fmov.s  @r0+, fr8
 139         fmov.s  @r0+, fr9
 140         fmov.s  @r0+, fr10
 141         fmov.s  @r0+, fr11
 142         fmov.s  @r0+, fr12
 143         fmov.s  @r0+, fr13
 144         fmov.s  @r0+, fr14
 145         fmov.s  @r0+, fr15
 146         frchg
 147         fmov.s  @r0+, fr0
 148         fmov.s  @r0+, fr1
 149         fmov.s  @r0+, fr2
 150         fmov.s  @r0+, fr3
 151         fmov.s  @r0+, fr4
 152         fmov.s  @r0+, fr5
 153         fmov.s  @r0+, fr6
 154         fmov.s  @r0+, fr7
 155         fmov.s  @r0+, fr8
 156         fmov.s  @r0+, fr9
 157         fmov.s  @r0+, fr10
 158         fmov.s  @r0+, fr11
 159         fmov.s  @r0+, fr12
 160         fmov.s  @r0+, fr13
 161         fmov.s  @r0+, fr14
 162         fmov.s  @r0+, fr15
 163         frchg
 164         lds.l   @r0+, fpscr
 165         lds.l   @r0+, fpul
 166
 167         mov     r8, r0
 168         add     #(oPC), r0
 169         mov.l   @r0+, r2
 170         lds.l   @r0+, pr
 171
 172         /* Restore T frag.  */
 173         mov.l   @r0+, r1
 174         shlr    r1
 175         /* Skip GBR which is used for thread pointer.  */
 176         add     #4, r0
 177
 178         lds.l   @r0+, mach
 179         lds.l   @r0+, macl
 180
 181         mov     r8, r0
 182         add     #(oR9), r0
 183         mov.l   @r0+, r9
 184         mov.l   @r0+, r10
 185         mov.l   @r0+, r11
 186         mov.l   @r0+, r12
 187         mov.l   @r0+, r13
 188         mov.l   @r0+, r14
 189         mov.l   @r0+, r15
 190
 191         mov     r8, r0
 192         mov.l   @(oR0,r0), r1
 193         mov.l   r1, @-r15
 194         cfi_adjust_cfa_offset(4)
 195         cfi_rel_offset (r1, 0)
 196         mov.l   r2, @-r15
 197         cfi_adjust_cfa_offset(4)
 198         cfi_rel_offset (r2, 0)
 199
 200         mov.l   @(oR1,r0), r1
 201         mov.l   @(oR2,r0), r2
 202         mov.l   @(oR3,r0), r3
 203         mov.l   @(oR4,r0), r4
 204         mov.l   @(oR5,r0), r5
 205         mov.l   @(oR6,r0), r6
 206         mov.l   @(oR7,r0), r7
 207         mov.l   @(oR8,r0), r8
 208         mov.l   @r15+, r0
 209         jmp     @r0
 210          mov.l  @r15+, r0
 211
 212 PSEUDO_END(__swapcontext)
 213
 214 weak_alias (__swapcontext, swapcontext)