newlib/libc/machine/cris/setjmp.c

   1 /* A setjmp.c for CRIS
   2    Copyright (C) 1993-2005 Axis Communications.
   3    All rights reserved.
   4
   5    Redistribution and use in source and binary forms, with or without
   6    modification, are permitted provided that the following conditions
   7    are met:
   8
   9    1. Redistributions of source code must retain the above copyright
  10       notice, this list of conditions and the following disclaimer.
  11
  12    2. Neither the name of Axis Communications nor the names of its
  13       contributors may be used to endorse or promote products derived
  14       from this software without specific prior written permission.
  15
  16    THIS SOFTWARE IS PROVIDED BY AXIS COMMUNICATIONS AND ITS CONTRIBUTORS
  17    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL AXIS
  20    COMMUNICATIONS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  21    INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  23    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  25    STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  26    IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  27    POSSIBILITY OF SUCH DAMAGE.  */
  28
  29 /* For benefit of CRIS v0..v3, we save and restore CCR to be able to
  30    correctly handle DI/EI; otherwise there would be no reason to save it.
  31    Note also that the "move x,ccr" does NOT affect
  32    the DMA enable bits (E and D) of v0..v3.
  33
  34    We do not save mof; it is call-clobbered.  It also does not exist in
  35    v0..v8; it should be safe to read or write to it there, but better not.
  36
  37    jmp_buf[0] - PC
  38    jmp_buf[1] - SP (R14)
  39    jmp_buf[2] - R13
  40    jmp_buf[3] - R12
  41    jmp_buf[4] - R11
  42    jmp_buf[5] - R10
  43    jmp_buf[6] - R9
  44    jmp_buf[7] - R8
  45    jmp_buf[8] - R7
  46    jmp_buf[9] - R6
  47    jmp_buf[10] - R5
  48    jmp_buf[11] - R4
  49    jmp_buf[12] - R3
  50    jmp_buf[13] - R2
  51    jmp_buf[14] - R1
  52    jmp_buf[15] - R0
  53    jmp_buf[16] - SRP
  54    jmp_buf[17] - CCR
  55    */
  56
  57 #include <setjmp.h>
  58
  59 int
  60 setjmp (jmp_buf buf)
  61 {
  62   int ret;
  63 #if defined (__arch_common_v10_v32) || defined (__arch_v32)
  64   /* No offsets in the compatibility mode.  Also, movem saves in
  65      different order on v10 than on v32, so we use single move
  66      instructions instead, this not being a speed-prioritized operation.
  67      And we don't save CCR or CCS; since long unuseful.  */
  68   __asm__ __volatile__
  69     ("move.d %1,$r13                                                    \n\
  70       move 0f,$mof                                                      \n\
  71       move $mof,[$r13+]                                                 \n\
  72       move.d $sp,[$r13+]                                                \n\
  73       clear.d [$r13+]                                                   \n\
  74       move.d $r12,[$r13+]                                               \n\
  75       move.d $r11,[$r13+]                                               \n\
  76       move.d $r10,[$r13+]                                               \n\
  77       moveq 1,$r9                                                       \n\
  78       move.d $r9,[$r13+]                                                \n\
  79       move.d $r8,[$r13+]                                                \n\
  80       move.d $r7,[$r13+]                                                \n\
  81       move.d $r6,[$r13+]                                                \n\
  82       move.d $r5,[$r13+]                                                \n\
  83       move.d $r4,[$r13+]                                                \n\
  84       move.d $r3,[$r13+]                                                \n\
  85       move.d $r2,[$r13+]                                                \n\
  86       move.d $r1,[$r13+]                                                \n\
  87       move.d $r0,[$r13+]                                                \n\
  88       move $srp,[$r13+]                                                 \n\
  89       clear.d [$r13+]                                                   \n\
  90       clear.d $r9                                                       \n\
  91 0:                                                                      \n\
  92       move.d $r9,%0"
  93
  94      /* Output.  */
  95      : "=&r" (ret)
  96
  97      /* Input.  */
  98      : "r" (buf)
  99
 100      /* Clobber.  */
 101      : "r9", "r13", "memory");
 102 #else /* not __arch_common_v10_v32 or __arch_v32 */
 103 #ifdef __PIC__
 104   __asm__ __volatile__
 105     ("moveq 1,$r9                                                       \n\
 106       movem $sp,[%1+1*4]                                                \n\
 107       move.d $pc,$r9                                                    \n\
 108       addq 0f-.,$r9                                                     \n\
 109       move.d $r9,[%1]                                                   \n\
 110       move $srp,[%1+16*4]                                               \n\
 111       move $ccr,[%1+17*4]                                               \n\
 112       clear.d $r9                                                       \n\
 113 0:                                                                      \n\
 114       move.d $r9,%0"
 115
 116      /* Output.  */
 117      : "=&r" (ret)
 118
 119      /* Input.  */
 120      : "r" (buf)
 121
 122      /* Clobber.  */
 123      : "r9", "memory");
 124 #else  /* not PIC */
 125   __asm__ __volatile__
 126     ("moveq 1,$r9                                                       \n\
 127       movem $sp,[%1+1*4]                                                \n\
 128       move.d 0f,$r9                                                     \n\
 129       move.d $r9,[%1]                                                   \n\
 130       move $srp,[%1+16*4]                                               \n\
 131       move $ccr,[%1+17*4]                                               \n\
 132       clear.d $r9                                                       \n\
 133 0:                                                                      \n\
 134       move.d $r9,%0"
 135
 136      /* Output.  */
 137      : "=&r" (ret)
 138
 139      /* Input.  */
 140      : "r" (buf)
 141
 142      /* Clobber.  */
 143      : "r9");
 144 #endif /* not PIC */
 145 #endif /* not __arch_common_v10_v32 or __arch_v32 */
 146   return ret;
 147 }
 148
 149 void
 150 longjmp(jmp_buf buf, int val)
 151 {
 152 #if defined (__arch_common_v10_v32) || defined (__arch_v32)
 153   __asm__ __volatile__
 154     ("cmpq 0,%1                                                         \n\
 155       beq 0f                                                            \n\
 156       move.d %0,$r13    ; In delay-slot.                                \n\
 157       addq 6*4,$r13                                                     \n\
 158       move.d %1,[$r13]                                                  \n\
 159       subq 6*4,$r13                                                     \n\
 160 0:\n"
 161 #ifdef __arch_common_v10_v32
 162      /* Cater to branch offset difference between v32 and v10.  We
 163         assume the branch above is 8-bit.  */
 164 "     setf\n"
 165 #endif
 166 "     move [$r13+],$mof                                                 \n\
 167       move.d [$r13+],$sp                                                \n\
 168       addq 4,$r13                                                       \n\
 169       move.d [$r13+],$r12                                               \n\
 170       move.d [$r13+],$r11                                               \n\
 171       move.d [$r13+],$r10                                               \n\
 172       move.d [$r13+],$r9                                                \n\
 173       move.d [$r13+],$r8                                                \n\
 174       move.d [$r13+],$r7                                                \n\
 175       move.d [$r13+],$r6                                                \n\
 176       move.d [$r13+],$r5                                                \n\
 177       move.d [$r13+],$r4                                                \n\
 178       move.d [$r13+],$r3                                                \n\
 179       move.d [$r13+],$r2                                                \n\
 180       move.d [$r13+],$r1                                                \n\
 181       move.d [$r13+],$r0                                                \n\
 182       move [$r13+],$srp                                                 \n\
 183       move $mof,$r13                                                    \n\
 184       jump $r13                                                         \n\
 185       setf"
 186
 187      /* No outputs.  */
 188      :
 189
 190      /* Inputs.  */
 191      : "r" (buf), "r" (val)
 192      : "r13", "memory");
 193
 194 #else /* not __arch_common_v10_v32 or __arch_v32 */
 195   __asm__ __volatile__
 196     ("move [%0+17*4],$ccr                                               \n\
 197       move [%0+16*4],$srp                                               \n\
 198       test.d %1                                                         \n\
 199       beq 0f                                                            \n\
 200       nop                                                               \n\
 201       move.d %1,[%0+6*4]        ; Offset for r9.                        \n\
 202 0:                                                                      \n\
 203       movem [%0],$pc"
 204
 205      /* No outputs.  */
 206      :
 207
 208      /* Inputs.  */
 209      : "r" (buf), "r" (val)
 210      : "memory");
 211 #endif /* not __arch_common_v10_v32 or __arch_v32 */
 212 }