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

   1 /* Save current context.
   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 __getcontext (ucontext_t *uc);  */
  25
  26         .text
  27         .align  5
  28 ENTRY(__getcontext)
  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         /* sigprocmask (SIG_BLOCK, NULL, &uc->uc_sigmask).  */
 106         mov     r4, r6
 107         /* We need 2 add instruction because oSIGMASK > 127.  */
 108         add     #(oSIGMASK/2), r6
 109         add     #(oSIGMASK/2), r6
 110         mov     #SIG_BLOCK, r4
 111         mov     #0, r5
 112         mov     #+SYS_ify(sigprocmask), r3
 113         trapa   #0x13
 114         mov     r0, r1
 115         mov     #-12, r2
 116         shad    r2, r1
 117         not     r1, r1                  // r1=0 means r0 = -1 to -4095
 118         tst     r1, r1                  // i.e. error in linux
 119         bf      .Lgetcontext_end
 120 .Lsyscall_error:
 121         SYSCALL_ERROR_HANDLER
 122 .Lgetcontext_end:
 123         /* All done, return 0 for success.  */
 124         mov     #0, r0
 125 .Lpseudo_end:
 126         rts
 127          nop
 128
 129 PSEUDO_END(__getcontext)
 130
 131 weak_alias (__getcontext, getcontext)