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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 | /* * U-boot - entry.h Routines for context saving and restoring * * Copyright (c) 2005-2007 Analog Devices Inc. * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, * MA 02110-1301 USA */ #ifndef __BLACKFIN_ENTRY_H #define __BLACKFIN_ENTRY_H #include <linux/config.h> #include <asm/setup.h> /* * Stack layout in 'ret_from_exception': * */ /* * Register %p2 is now set to the current task throughout * the whole kernel. */ #ifdef __ASSEMBLY__ #define LFLUSH_I_AND_D 0x00000808 #define LSIGTRAP 5 /* process bits for task_struct.flags */ #define PF_TRACESYS_OFF 3 #define PF_TRACESYS_BIT 5 #define PF_PTRACED_OFF 3 #define PF_PTRACED_BIT 4 #define PF_DTRACE_OFF 1 #define PF_DTRACE_BIT 5 #define NEW_PT_REGS #if defined(NEW_PT_REGS) #define SAVE_ALL_INT save_context_no_interrupts #define SAVE_ALL_SYS save_context_no_interrupts #define SAVE_CONTEXT save_context_with_interrupts #define RESTORE_ALL restore_context_no_interrupts #define RESTORE_ALL_SYS restore_context_no_interrupts #define RESTORE_CONTEXT restore_context_with_interrupts #else #define SAVE_ALL_INT save_all_int #define SAVE_ALL_SYS save_all_sys #define SAVE_CONTEXT save_context #define RESTORE_ALL restore_context #define RESTORE_CONTEXT restore_context #endif /* * Code to save processor context. * We even save the register which are preserved by a function call * - r4, r5, r6, r7, p3, p4, p5 */ .macro save_context_with_interrupts [--sp] = R0; [--sp] = ( R7:0, P5:0 ); [--sp] = fp; [--sp] = usp; [--sp] = i0; [--sp] = i1; [--sp] = i2; [--sp] = i3; [--sp] = m0; [--sp] = m1; [--sp] = m2; [--sp] = m3; [--sp] = l0; [--sp] = l1; [--sp] = l2; [--sp] = l3; [--sp] = b0; [--sp] = b1; [--sp] = b2; [--sp] = b3; [--sp] = a0.x; [--sp] = a0.w; [--sp] = a1.x; [--sp] = a1.w; [--sp] = LC0; [--sp] = LC1; [--sp] = LT0; [--sp] = LT1; [--sp] = LB0; [--sp] = LB1; [--sp] = ASTAT; [--sp] = r0; /* Skip reserved */ [--sp] = RETS; [--sp] = RETI; [--sp] = RETX; [--sp] = RETN; [--sp] = RETE; [--sp] = SEQSTAT; [--sp] = SYSCFG; [--sp] = r0; /* Skip IPEND as well. */ .endm .macro save_context_no_interrupts [--sp] = R0; [--sp] = ( R7:0, P5:0 ); [--sp] = fp; [--sp] = usp; [--sp] = i0; [--sp] = i1; [--sp] = i2; [--sp] = i3; [--sp] = m0; [--sp] = m1; [--sp] = m2; [--sp] = m3; [--sp] = l0; [--sp] = l1; [--sp] = l2; [--sp] = l3; [--sp] = b0; [--sp] = b1; [--sp] = b2; [--sp] = b3; [--sp] = a0.x; [--sp] = a0.w; [--sp] = a1.x; [--sp] = a1.w; [--sp] = LC0; [--sp] = LC1; [--sp] = LT0; [--sp] = LT1; [--sp] = LB0; [--sp] = LB1; [--sp] = ASTAT; [--sp] = r0; /* Skip reserved */ [--sp] = RETS; r0 = RETI; [--sp] = r0; [--sp] = RETX; [--sp] = RETN; [--sp] = RETE; [--sp] = SEQSTAT; [--sp] = SYSCFG; [--sp] = r0; /* Skip IPEND as well. */ .endm .macro restore_context_no_interrupts sp += 4; SYSCFG = [sp++]; SEQSTAT = [sp++]; RETE = [sp++]; RETN = [sp++]; RETX = [sp++]; r0 = [sp++]; RETI = r0; RETS = [sp++]; sp += 4; ASTAT = [sp++]; LB1 = [sp++]; LB0 = [sp++]; LT1 = [sp++]; LT0 = [sp++]; LC1 = [sp++]; LC0 = [sp++]; a1.w = [sp++]; a1.x = [sp++]; a0.w = [sp++]; a0.x = [sp++]; b3 = [sp++]; b2 = [sp++]; b1 = [sp++]; b0 = [sp++]; l3 = [sp++]; l2 = [sp++]; l1 = [sp++]; l0 = [sp++]; m3 = [sp++]; m2 = [sp++]; m1 = [sp++]; m0 = [sp++]; i3 = [sp++]; i2 = [sp++]; i1 = [sp++]; i0 = [sp++]; sp += 4; fp = [sp++]; ( R7 : 0, P5 : 0) = [ SP ++ ]; sp += 4; .endm .macro restore_context_with_interrupts sp += 4; SYSCFG = [sp++]; SEQSTAT = [sp++]; RETE = [sp++]; RETN = [sp++]; RETX = [sp++]; RETI = [sp++]; RETS = [sp++]; sp += 4; ASTAT = [sp++]; LB1 = [sp++]; LB0 = [sp++]; LT1 = [sp++]; LT0 = [sp++]; LC1 = [sp++]; LC0 = [sp++]; a1.w = [sp++]; a1.x = [sp++]; a0.w = [sp++]; a0.x = [sp++]; b3 = [sp++]; b2 = [sp++]; b1 = [sp++]; b0 = [sp++]; l3 = [sp++]; l2 = [sp++]; l1 = [sp++]; l0 = [sp++]; m3 = [sp++]; m2 = [sp++]; m1 = [sp++]; m0 = [sp++]; i3 = [sp++]; i2 = [sp++]; i1 = [sp++]; i0 = [sp++]; sp += 4; fp = [sp++]; ( R7 : 0, P5 : 0) = [ SP ++ ]; sp += 4; .endm #if !defined(NEW_PT_REGS) /* * a -1 in the orig_r0 field signifies * that the stack frame is NOT for syscall */ .macro save_all_int /* reserved and disable the single step of SYSCFG, by Steven Chen 03/07/10 */ [--sp] = r0; r0.l = 0x30; /* Errata for BF533 */ r0.h = 0x0; syscfg = r0; /* disable single step flag in SYSCFG */ r0 = [sp++]; [--sp] = syscfg; /* store SYSCFG */ [--sp] = r0; /* Reserved for IPEND */ [--sp] = fp; [--sp] = usp; [--sp] = r0; [--sp] = r0; r0 = [sp + 8]; [--sp] = a0.x; [--sp] = a1.x; [--sp] = a0.w; [--sp] = a1.w; [--sp] = rets; [--sp] = astat; [--sp] = seqstat; [--sp] = retx; /* current pc when exception happens */ [--sp] = ( r7:5, p5:0 ); [--sp] = r1; [--sp] = r2; [--sp] = r4; [--sp] = r3; .endm .macro save_all_sys [--sp] = r0; [--sp] = r0; [--sp] = a0.x; [--sp] = a1.x; [--sp] = a0.w; [--sp] = a1.w; [--sp] = rets; [--sp] = astat; [--sp] = seqstat; [--sp] = retx; /* current pc when exception happens */ [--sp] = ( r7:5, p5:0 ); [--sp] = r1; [--sp] = r2; [--sp] = r4; [--sp] = r3; .endm .macro restore_all r3 = [sp++]; r4 = [sp++]; r2 = [sp++]; r1 = [sp++]; ( r7:5, p5:0 ) = [sp++]; retx = [sp++]; seqstat = [sp++]; astat = [sp++]; rets = [sp++]; a1.w = [sp++]; a0.w = [sp++]; a1.x = [sp++]; a0.x = [sp++]; sp += 4; /* orig r0 */ r0 = [sp++]; sp += 4; fp = [sp++]; sp +=4; /* Skip the IPEND */ syscfg = [sp++]; .endm #endif #define STR(X) STR1(X) #define STR1(X) #X #if defined(NEW_PT_REGS) #define PT_OFF_ORIG_R0 208 #define PT_OFF_SR 8 #else #define PT_OFF_ORIG_R0 0x54 #define PT_OFF_SR 0x38 /* seqstat in pt_regs */ #endif #endif #endif |