include/asm-blackfin/entry.h

   1 /*
   2  * entry.h - routines for context saving and restoring (for interrupts/exceptions)
   3  *
   4  * Copyright (c) 2005-2007 Analog Devices Inc.
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  22  * MA 02110-1301 USA
  23  */
  24
  25 #ifndef __BLACKFIN_ENTRY_H
  26 #define __BLACKFIN_ENTRY_H
  27 #ifdef __ASSEMBLY__
  28
  29 #define SAVE_ALL_INT            save_context_no_interrupts
  30 #define SAVE_ALL_SYS            save_context_no_interrupts
  31 #define SAVE_CONTEXT            save_context_with_interrupts
  32
  33 #define RESTORE_ALL             restore_context_no_interrupts
  34 #define RESTORE_ALL_SYS         restore_context_no_interrupts
  35 #define RESTORE_CONTEXT         restore_context_with_interrupts
  36
  37 /*
  38  * Code to save processor context.
  39  * We even save the register which are preserved by a function call
  40  * - r4, r5, r6, r7, p3, p4, p5
  41  */
  42 .macro save_context_with_interrupts
  43         [--sp] = R0;
  44         [--sp] = ( R7:0, P5:0 );
  45         [--sp] = fp;
  46         [--sp] = usp;
  47
  48         [--sp] = i0;
  49         [--sp] = i1;
  50         [--sp] = i2;
  51         [--sp] = i3;
  52
  53         [--sp] = m0;
  54         [--sp] = m1;
  55         [--sp] = m2;
  56         [--sp] = m3;
  57
  58         [--sp] = l0;
  59         [--sp] = l1;
  60         [--sp] = l2;
  61         [--sp] = l3;
  62
  63         [--sp] = b0;
  64         [--sp] = b1;
  65         [--sp] = b2;
  66         [--sp] = b3;
  67         [--sp] = a0.x;
  68         [--sp] = a0.w;
  69         [--sp] = a1.x;
  70         [--sp] = a1.w;
  71
  72         [--sp] = LC0;
  73         [--sp] = LC1;
  74         [--sp] = LT0;
  75         [--sp] = LT1;
  76         [--sp] = LB0;
  77         [--sp] = LB1;
  78
  79         [--sp] = ASTAT;
  80
  81         [--sp] = r0;    /* Skip reserved */
  82         [--sp] = RETS;
  83         [--sp] = RETI;
  84         [--sp] = RETX;
  85         [--sp] = RETN;
  86         [--sp] = RETE;
  87         [--sp] = SEQSTAT;
  88         [--sp] = SYSCFG;
  89         [--sp] = r0;    /* Skip IPEND as well. */
  90 .endm
  91
  92 .macro save_context_no_interrupts
  93         [--sp] = R0;
  94         [--sp] = ( R7:0, P5:0 );
  95         [--sp] = fp;
  96         [--sp] = usp;
  97
  98         [--sp] = i0;
  99         [--sp] = i1;
 100         [--sp] = i2;
 101         [--sp] = i3;
 102
 103         [--sp] = m0;
 104         [--sp] = m1;
 105         [--sp] = m2;
 106         [--sp] = m3;
 107
 108         [--sp] = l0;
 109         [--sp] = l1;
 110         [--sp] = l2;
 111         [--sp] = l3;
 112
 113         [--sp] = b0;
 114         [--sp] = b1;
 115         [--sp] = b2;
 116         [--sp] = b3;
 117         [--sp] = a0.x;
 118         [--sp] = a0.w;
 119         [--sp] = a1.x;
 120         [--sp] = a1.w;
 121
 122         [--sp] = LC0;
 123         [--sp] = LC1;
 124         [--sp] = LT0;
 125         [--sp] = LT1;
 126         [--sp] = LB0;
 127         [--sp] = LB1;
 128
 129         [--sp] = ASTAT;
 130
 131         [--sp] = r0;    /* Skip reserved */
 132         [--sp] = RETS;
 133         r0 = RETI;
 134         [--sp] = r0;
 135         [--sp] = RETX;
 136         [--sp] = RETN;
 137         [--sp] = RETE;
 138         [--sp] = SEQSTAT;
 139         [--sp] = SYSCFG;
 140         [--sp] = r0;    /* Skip IPEND as well. */
 141 .endm
 142
 143 .macro restore_context_no_interrupts
 144         sp += 4;
 145         SYSCFG = [sp++];
 146         SEQSTAT = [sp++];
 147         RETE = [sp++];
 148         RETN = [sp++];
 149         RETX = [sp++];
 150         r0 = [sp++];
 151         RETI = r0;
 152         RETS = [sp++];
 153
 154         sp += 4;
 155
 156         ASTAT = [sp++];
 157
 158         LB1 = [sp++];
 159         LB0 = [sp++];
 160         LT1 = [sp++];
 161         LT0 = [sp++];
 162         LC1 = [sp++];
 163         LC0 = [sp++];
 164
 165         a1.w = [sp++];
 166         a1.x = [sp++];
 167         a0.w = [sp++];
 168         a0.x = [sp++];
 169         b3 = [sp++];
 170         b2 = [sp++];
 171         b1 = [sp++];
 172         b0 = [sp++];
 173
 174         l3 = [sp++];
 175         l2 = [sp++];
 176         l1 = [sp++];
 177         l0 = [sp++];
 178
 179         m3 = [sp++];
 180         m2 = [sp++];
 181         m1 = [sp++];
 182         m0 = [sp++];
 183
 184         i3 = [sp++];
 185         i2 = [sp++];
 186         i1 = [sp++];
 187         i0 = [sp++];
 188
 189         sp += 4;
 190         fp = [sp++];
 191
 192         ( R7 : 0, P5 : 0) = [ SP ++ ];
 193         sp += 4;
 194 .endm
 195
 196 .macro restore_context_with_interrupts
 197         sp += 4;
 198         SYSCFG = [sp++];
 199         SEQSTAT = [sp++];
 200         RETE = [sp++];
 201         RETN = [sp++];
 202         RETX = [sp++];
 203         RETI = [sp++];
 204         RETS = [sp++];
 205
 206         sp += 4;
 207
 208         ASTAT = [sp++];
 209
 210         LB1 = [sp++];
 211         LB0 = [sp++];
 212         LT1 = [sp++];
 213         LT0 = [sp++];
 214         LC1 = [sp++];
 215         LC0 = [sp++];
 216
 217         a1.w = [sp++];
 218         a1.x = [sp++];
 219         a0.w = [sp++];
 220         a0.x = [sp++];
 221         b3 = [sp++];
 222         b2 = [sp++];
 223         b1 = [sp++];
 224         b0 = [sp++];
 225
 226         l3 = [sp++];
 227         l2 = [sp++];
 228         l1 = [sp++];
 229         l0 = [sp++];
 230
 231         m3 = [sp++];
 232         m2 = [sp++];
 233         m1 = [sp++];
 234         m0 = [sp++];
 235
 236         i3 = [sp++];
 237         i2 = [sp++];
 238         i1 = [sp++];
 239         i0 = [sp++];
 240
 241         sp += 4;
 242         fp = [sp++];
 243
 244         ( R7 : 0, P5 : 0) = [ SP ++ ];
 245         sp += 4;
 246 .endm
 247
 248 #endif
 249 #endif