include/asm-blackfin/entry.h

   1 /*
   2  * U-boot - entry.h Routines for context saving and restoring
   3  *
   4  * Copyright (c) 2005 blackfin.uclinux.org
   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., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 #ifndef __BLACKFIN_ENTRY_H
  26 #define __BLACKFIN_ENTRY_H
  27
  28 #include <linux/config.h>
  29 #include <asm/setup.h>
  30 #include <asm/page.h>
  31
  32 /*
  33  * Stack layout in 'ret_from_exception':
  34  *
  35  */
  36
  37 /*
  38  * Register %p2 is now set to the current task throughout
  39  * the whole kernel.
  40  */
  41
  42 #ifdef __ASSEMBLY__
  43
  44 #define LFLUSH_I_AND_D  0x00000808
  45 #define LSIGTRAP        5
  46
  47 /* process bits for task_struct.flags */
  48 #define PF_TRACESYS_OFF 3
  49 #define PF_TRACESYS_BIT 5
  50 #define PF_PTRACED_OFF  3
  51 #define PF_PTRACED_BIT  4
  52 #define PF_DTRACE_OFF   1
  53 #define PF_DTRACE_BIT   5
  54
  55 #define NEW_PT_REGS
  56
  57 #if defined(NEW_PT_REGS)
  58
  59 #define SAVE_ALL_INT            save_context_no_interrupts
  60 #define SAVE_ALL_SYS            save_context_no_interrupts
  61 #define SAVE_CONTEXT            save_context_with_interrupts
  62
  63 #define RESTORE_ALL             restore_context_no_interrupts
  64 #define RESTORE_ALL_SYS         restore_context_no_interrupts
  65 #define RESTORE_CONTEXT         restore_context_with_interrupts
  66
  67 #else
  68
  69 #define SAVE_ALL_INT            save_all_int
  70 #define SAVE_ALL_SYS            save_all_sys
  71 #define SAVE_CONTEXT            save_context
  72 #define RESTORE_ALL             restore_context
  73 #define RESTORE_CONTEXT         restore_context
  74
  75 #endif
  76
  77 /*
  78  * Code to save processor context.
  79  * We even save the register which are preserved by a function call
  80  * - r4, r5, r6, r7, p3, p4, p5
  81  */
  82 .macro save_context_with_interrupts
  83         [--sp] = R0;
  84         [--sp] = ( R7:0, P5:0 );
  85         [--sp] = fp;
  86         [--sp] = usp;
  87
  88         [--sp] = i0;
  89         [--sp] = i1;
  90         [--sp] = i2;
  91         [--sp] = i3;
  92
  93         [--sp] = m0;
  94         [--sp] = m1;
  95         [--sp] = m2;
  96         [--sp] = m3;
  97
  98         [--sp] = l0;
  99         [--sp] = l1;
 100         [--sp] = l2;
 101         [--sp] = l3;
 102
 103         [--sp] = b0;
 104         [--sp] = b1;
 105         [--sp] = b2;
 106         [--sp] = b3;
 107         [--sp] = a0.x;
 108         [--sp] = a0.w;
 109         [--sp] = a1.x;
 110         [--sp] = a1.w;
 111
 112         [--sp] = LC0;
 113         [--sp] = LC1;
 114         [--sp] = LT0;
 115         [--sp] = LT1;
 116         [--sp] = LB0;
 117         [--sp] = LB1;
 118
 119         [--sp] = ASTAT;
 120
 121         [--sp] = r0;    /* Skip reserved */
 122         [--sp] = RETS;
 123         [--sp] = RETI;
 124         [--sp] = RETX;
 125         [--sp] = RETN;
 126         [--sp] = RETE;
 127         [--sp] = SEQSTAT;
 128         [--sp] = SYSCFG;
 129         [--sp] = r0;    /* Skip IPEND as well. */
 130 .endm
 131
 132 .macro save_context_no_interrupts
 133         [--sp] = R0;
 134         [--sp] = ( R7:0, P5:0 );
 135         [--sp] = fp;
 136         [--sp] = usp;
 137
 138         [--sp] = i0;
 139         [--sp] = i1;
 140         [--sp] = i2;
 141         [--sp] = i3;
 142
 143         [--sp] = m0;
 144         [--sp] = m1;
 145         [--sp] = m2;
 146         [--sp] = m3;
 147
 148         [--sp] = l0;
 149         [--sp] = l1;
 150         [--sp] = l2;
 151         [--sp] = l3;
 152
 153         [--sp] = b0;
 154         [--sp] = b1;
 155         [--sp] = b2;
 156         [--sp] = b3;
 157         [--sp] = a0.x;
 158         [--sp] = a0.w;
 159         [--sp] = a1.x;
 160         [--sp] = a1.w;
 161
 162         [--sp] = LC0;
 163         [--sp] = LC1;
 164         [--sp] = LT0;
 165         [--sp] = LT1;
 166         [--sp] = LB0;
 167         [--sp] = LB1;
 168
 169         [--sp] = ASTAT;
 170
 171         [--sp] = r0;    /* Skip reserved */
 172         [--sp] = RETS;
 173         r0 = RETI;
 174         [--sp] = r0;
 175         [--sp] = RETX;
 176         [--sp] = RETN;
 177         [--sp] = RETE;
 178         [--sp] = SEQSTAT;
 179         [--sp] = SYSCFG;
 180         [--sp] = r0;    /* Skip IPEND as well. */
 181 .endm
 182
 183 .macro restore_context_no_interrupts
 184         sp += 4;
 185         SYSCFG = [sp++];
 186         SEQSTAT = [sp++];
 187         RETE = [sp++];
 188         RETN = [sp++];
 189         RETX = [sp++];
 190         r0 = [sp++];
 191         RETI = r0;
 192         RETS = [sp++];
 193
 194         sp += 4;
 195
 196         ASTAT = [sp++];
 197
 198         LB1 = [sp++];
 199         LB0 = [sp++];
 200         LT1 = [sp++];
 201         LT0 = [sp++];
 202         LC1 = [sp++];
 203         LC0 = [sp++];
 204
 205         a1.w = [sp++];
 206         a1.x = [sp++];
 207         a0.w = [sp++];
 208         a0.x = [sp++];
 209         b3 = [sp++];
 210         b2 = [sp++];
 211         b1 = [sp++];
 212         b0 = [sp++];
 213
 214         l3 = [sp++];
 215         l2 = [sp++];
 216         l1 = [sp++];
 217         l0 = [sp++];
 218
 219         m3 = [sp++];
 220         m2 = [sp++];
 221         m1 = [sp++];
 222         m0 = [sp++];
 223
 224         i3 = [sp++];
 225         i2 = [sp++];
 226         i1 = [sp++];
 227         i0 = [sp++];
 228
 229         sp += 4;
 230         fp = [sp++];
 231
 232         ( R7 : 0, P5 : 0) = [ SP ++ ];
 233         sp += 4;
 234 .endm
 235
 236 .macro restore_context_with_interrupts
 237         sp += 4;
 238         SYSCFG = [sp++];
 239         SEQSTAT = [sp++];
 240         RETE = [sp++];
 241         RETN = [sp++];
 242         RETX = [sp++];
 243         RETI = [sp++];
 244         RETS = [sp++];
 245
 246         sp += 4;
 247
 248         ASTAT = [sp++];
 249
 250         LB1 = [sp++];
 251         LB0 = [sp++];
 252         LT1 = [sp++];
 253         LT0 = [sp++];
 254         LC1 = [sp++];
 255         LC0 = [sp++];
 256
 257         a1.w = [sp++];
 258         a1.x = [sp++];
 259         a0.w = [sp++];
 260         a0.x = [sp++];
 261         b3 = [sp++];
 262         b2 = [sp++];
 263         b1 = [sp++];
 264         b0 = [sp++];
 265
 266         l3 = [sp++];
 267         l2 = [sp++];
 268         l1 = [sp++];
 269         l0 = [sp++];
 270
 271         m3 = [sp++];
 272         m2 = [sp++];
 273         m1 = [sp++];
 274         m0 = [sp++];
 275
 276         i3 = [sp++];
 277         i2 = [sp++];
 278         i1 = [sp++];
 279         i0 = [sp++];
 280
 281         sp += 4;
 282         fp = [sp++];
 283
 284         ( R7 : 0, P5 : 0) = [ SP ++ ];
 285         sp += 4;
 286 .endm
 287
 288 #if !defined(NEW_PT_REGS)
 289 /*
 290  * a -1 in the orig_r0 field signifies
 291  * that the stack frame is NOT for syscall
 292  */
 293 .macro  save_all_int
 294 /* reserved and disable the single step of SYSCFG, by Steven Chen 03/07/10 */
 295         [--sp] = r0;
 296         r0.l = 0x30;            /* Errata for BF533 */
 297         r0.h = 0x0;
 298         syscfg = r0;            /* disable single step flag in SYSCFG */
 299         r0 = [sp++];
 300         [--sp] = syscfg;        /* store SYSCFG */
 301
 302         [--sp] = r0;    /* Reserved for IPEND */
 303         [--sp] = fp;
 304         [--sp] = usp;
 305         [--sp] = r0;
 306
 307         [--sp] = r0;
 308         r0 = [sp + 8];
 309         [--sp] = a0.x;
 310         [--sp] = a1.x;
 311         [--sp] = a0.w;
 312         [--sp] = a1.w;
 313         [--sp] = rets;
 314         [--sp] = astat;
 315         [--sp] = seqstat;
 316         [--sp] = retx;  /* current pc when exception happens */
 317         [--sp] = ( r7:5, p5:0 );
 318         [--sp] = r1;
 319         [--sp] = r2;
 320         [--sp] = r4;
 321         [--sp] = r3;
 322 .endm
 323
 324 .macro  save_all_sys
 325         [--sp] = r0;
 326         [--sp] = r0;
 327         [--sp] = a0.x;
 328         [--sp] = a1.x;
 329         [--sp] = a0.w;
 330         [--sp] = a1.w;
 331         [--sp] = rets;
 332         [--sp] = astat;
 333         [--sp] = seqstat;
 334         [--sp] = retx;  /* current pc when exception happens */
 335         [--sp] = ( r7:5, p5:0 );
 336         [--sp] = r1;
 337         [--sp] = r2;
 338         [--sp] = r4;
 339         [--sp] = r3;
 340 .endm
 341
 342 .macro  restore_all
 343         r3 = [sp++];
 344         r4 = [sp++];
 345         r2 = [sp++];
 346         r1 = [sp++];
 347         ( r7:5, p5:0 ) = [sp++];
 348         retx = [sp++];
 349         seqstat = [sp++];
 350         astat = [sp++];
 351         rets = [sp++];
 352         a1.w = [sp++];
 353         a0.w = [sp++];
 354         a1.x = [sp++];
 355         a0.x = [sp++];
 356         sp += 4;        /* orig r0 */
 357         r0 = [sp++];
 358
 359         sp += 4;
 360         fp = [sp++];
 361         sp +=4;         /* Skip the IPEND */
 362
 363         syscfg = [sp++];
 364
 365 .endm
 366
 367 #endif
 368
 369 #define STR(X)                  STR1(X)
 370 #define STR1(X)                 #X
 371
 372 #if defined(NEW_PT_REGS)
 373
 374 #define PT_OFF_ORIG_R0          208
 375 #define PT_OFF_SR               8
 376
 377 #else
 378
 379 #define PT_OFF_ORIG_R0          0x54
 380 #define PT_OFF_SR               0x38    /* seqstat in pt_regs */
 381
 382 #endif
 383 #endif
 384
 385 #endif