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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 | ############################################################################### # # switch_to.S: context switch operation # # Copyright (C) 2003 Red Hat, Inc. All Rights Reserved. # Written by David Howells (dhowells@redhat.com) # # 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. # ############################################################################### #include <linux/linkage.h> #include <asm/thread_info.h> #include <asm/processor.h> #include <asm/registers.h> #include <asm/spr-regs.h> .macro LEDS val setlos #~\val,gr27 st gr27,@(gr30,gr0) membar dcf @(gr30,gr0) .endm .section .sdata .balign 8 # address of frame 0 (userspace) on current kernel stack .globl __kernel_frame0_ptr __kernel_frame0_ptr: .long init_thread_union + THREAD_SIZE - FRV_FRAME0_SIZE # address of current task .globl __kernel_current_task __kernel_current_task: .long init_task .section .text .balign 4 ############################################################################### # # struct task_struct *__switch_to(struct thread_struct *prev_thread, # struct thread_struct *next_thread, # struct task_struct *prev) # ############################################################################### .globl __switch_to __switch_to: # save outgoing process's context sethi.p %hi(__switch_back),gr13 setlo %lo(__switch_back),gr13 movsg lr,gr12 stdi gr28,@(gr8,#__THREAD_FRAME) sti sp ,@(gr8,#__THREAD_SP) sti fp ,@(gr8,#__THREAD_FP) stdi gr12,@(gr8,#__THREAD_LR) stdi gr16,@(gr8,#__THREAD_GR(16)) stdi gr18,@(gr8,#__THREAD_GR(18)) stdi gr20,@(gr8,#__THREAD_GR(20)) stdi gr22,@(gr8,#__THREAD_GR(22)) stdi gr24,@(gr8,#__THREAD_GR(24)) stdi.p gr26,@(gr8,#__THREAD_GR(26)) or gr8,gr8,gr22 ldi.p @(gr8,#__THREAD_USER),gr8 call save_user_regs or gr22,gr22,gr8 # retrieve the new context sethi.p %hi(__kernel_frame0_ptr),gr6 setlo %lo(__kernel_frame0_ptr),gr6 movsg psr,gr4 lddi.p @(gr9,#__THREAD_FRAME),gr10 or gr10,gr10,gr27 ; save prev for the return value ldi @(gr11,#4),gr19 ; get new_current->thread_info lddi @(gr9,#__THREAD_SP),gr12 ldi @(gr9,#__THREAD_LR),gr14 ldi @(gr9,#__THREAD_PC),gr18 ldi.p @(gr9,#__THREAD_FRAME0),gr7 # actually switch kernel contexts with ordinary exceptions disabled andi gr4,#~PSR_ET,gr5 movgs gr5,psr or.p gr10,gr0,gr28 ; set __frame or gr11,gr0,gr29 ; set __current or.p gr12,gr0,sp or gr13,gr0,fp or gr19,gr0,gr15 ; set __current_thread_info sti gr7,@(gr6,#0) ; set __kernel_frame0_ptr sti gr29,@(gr6,#4) ; set __kernel_current_task movgs gr14,lr bar # jump to __switch_back or ret_from_fork as appropriate # - move prev to GR8 movgs gr4,psr jmpl.p @(gr18,gr0) or gr27,gr27,gr8 ############################################################################### # # restore incoming process's context # - on entry: # - SP, FP, LR, GR15, GR28 and GR29 will have been set up appropriately # - GR8 will point to the outgoing task_struct # - GR9 will point to the incoming thread_struct # ############################################################################### __switch_back: lddi @(gr9,#__THREAD_GR(16)),gr16 lddi @(gr9,#__THREAD_GR(18)),gr18 lddi @(gr9,#__THREAD_GR(20)),gr20 lddi @(gr9,#__THREAD_GR(22)),gr22 lddi @(gr9,#__THREAD_GR(24)),gr24 lddi @(gr9,#__THREAD_GR(26)),gr26 # fall through into restore_user_regs() ldi.p @(gr9,#__THREAD_USER),gr8 or gr8,gr8,gr9 ############################################################################### # # restore extra general regs and FP/Media regs # - void *restore_user_regs(const struct user_context *target, void *retval) # - on entry: # - GR8 will point to the user context to swap in # - GR9 will contain the value to be returned in GR8 (prev task on context switch) # ############################################################################### .globl restore_user_regs restore_user_regs: movsg hsr0,gr6 ori gr6,#HSR0_GRHE|HSR0_FRLE|HSR0_FRHE,gr6 movgs gr6,hsr0 movsg hsr0,gr6 movsg psr,gr7 ori gr7,#PSR_EF|PSR_EM,gr7 movgs gr7,psr movsg psr,gr7 srli gr7,#24,gr7 bar lddi @(gr8,#__FPMEDIA_MSR(0)),gr4 movgs gr4,msr0 movgs gr5,msr1 lddfi @(gr8,#__FPMEDIA_ACC(0)),fr16 lddfi @(gr8,#__FPMEDIA_ACC(2)),fr18 ldbfi @(gr8,#__FPMEDIA_ACCG(0)),fr20 ldbfi @(gr8,#__FPMEDIA_ACCG(1)),fr21 ldbfi @(gr8,#__FPMEDIA_ACCG(2)),fr22 ldbfi @(gr8,#__FPMEDIA_ACCG(3)),fr23 mwtacc fr16,acc0 mwtacc fr17,acc1 mwtacc fr18,acc2 mwtacc fr19,acc3 mwtaccg fr20,accg0 mwtaccg fr21,accg1 mwtaccg fr22,accg2 mwtaccg fr23,accg3 # some CPUs have extra ACCx and ACCGx regs and maybe FSRx regs subicc.p gr7,#0x50,gr0,icc0 subicc gr7,#0x31,gr0,icc1 beq icc0,#0,__restore_acc_fr451 beq icc1,#0,__restore_acc_fr555 __restore_acc_cont: # some CPU's have GR32-GR63 setlos #HSR0_FRHE,gr4 andcc gr6,gr4,gr0,icc0 beq icc0,#1,__restore_skip_gr32_gr63 lddi @(gr8,#__INT_GR(32)),gr32 lddi @(gr8,#__INT_GR(34)),gr34 lddi @(gr8,#__INT_GR(36)),gr36 lddi @(gr8,#__INT_GR(38)),gr38 lddi @(gr8,#__INT_GR(40)),gr40 lddi @(gr8,#__INT_GR(42)),gr42 lddi @(gr8,#__INT_GR(44)),gr44 lddi @(gr8,#__INT_GR(46)),gr46 lddi @(gr8,#__INT_GR(48)),gr48 lddi @(gr8,#__INT_GR(50)),gr50 lddi @(gr8,#__INT_GR(52)),gr52 lddi @(gr8,#__INT_GR(54)),gr54 lddi @(gr8,#__INT_GR(56)),gr56 lddi @(gr8,#__INT_GR(58)),gr58 lddi @(gr8,#__INT_GR(60)),gr60 lddi @(gr8,#__INT_GR(62)),gr62 __restore_skip_gr32_gr63: # all CPU's have FR0-FR31 lddfi @(gr8,#__FPMEDIA_FR( 0)),fr0 lddfi @(gr8,#__FPMEDIA_FR( 2)),fr2 lddfi @(gr8,#__FPMEDIA_FR( 4)),fr4 lddfi @(gr8,#__FPMEDIA_FR( 6)),fr6 lddfi @(gr8,#__FPMEDIA_FR( 8)),fr8 lddfi @(gr8,#__FPMEDIA_FR(10)),fr10 lddfi @(gr8,#__FPMEDIA_FR(12)),fr12 lddfi @(gr8,#__FPMEDIA_FR(14)),fr14 lddfi @(gr8,#__FPMEDIA_FR(16)),fr16 lddfi @(gr8,#__FPMEDIA_FR(18)),fr18 lddfi @(gr8,#__FPMEDIA_FR(20)),fr20 lddfi @(gr8,#__FPMEDIA_FR(22)),fr22 lddfi @(gr8,#__FPMEDIA_FR(24)),fr24 lddfi @(gr8,#__FPMEDIA_FR(26)),fr26 lddfi @(gr8,#__FPMEDIA_FR(28)),fr28 lddfi.p @(gr8,#__FPMEDIA_FR(30)),fr30 # some CPU's have FR32-FR63 setlos #HSR0_FRHE,gr4 andcc gr6,gr4,gr0,icc0 beq icc0,#1,__restore_skip_fr32_fr63 lddfi @(gr8,#__FPMEDIA_FR(32)),fr32 lddfi @(gr8,#__FPMEDIA_FR(34)),fr34 lddfi @(gr8,#__FPMEDIA_FR(36)),fr36 lddfi @(gr8,#__FPMEDIA_FR(38)),fr38 lddfi @(gr8,#__FPMEDIA_FR(40)),fr40 lddfi @(gr8,#__FPMEDIA_FR(42)),fr42 lddfi @(gr8,#__FPMEDIA_FR(44)),fr44 lddfi @(gr8,#__FPMEDIA_FR(46)),fr46 lddfi @(gr8,#__FPMEDIA_FR(48)),fr48 lddfi @(gr8,#__FPMEDIA_FR(50)),fr50 lddfi @(gr8,#__FPMEDIA_FR(52)),fr52 lddfi @(gr8,#__FPMEDIA_FR(54)),fr54 lddfi @(gr8,#__FPMEDIA_FR(56)),fr56 lddfi @(gr8,#__FPMEDIA_FR(58)),fr58 lddfi @(gr8,#__FPMEDIA_FR(60)),fr60 lddfi @(gr8,#__FPMEDIA_FR(62)),fr62 __restore_skip_fr32_fr63: lddi @(gr8,#__FPMEDIA_FNER(0)),gr4 movsg fner0,gr4 movsg fner1,gr5 or.p gr9,gr9,gr8 bralr # the FR451 also has ACC8-11/ACCG8-11 regs (but not 4-7...) __restore_acc_fr451: lddfi @(gr8,#__FPMEDIA_ACC(4)),fr16 lddfi @(gr8,#__FPMEDIA_ACC(6)),fr18 ldbfi @(gr8,#__FPMEDIA_ACCG(4)),fr20 ldbfi @(gr8,#__FPMEDIA_ACCG(5)),fr21 ldbfi @(gr8,#__FPMEDIA_ACCG(6)),fr22 ldbfi @(gr8,#__FPMEDIA_ACCG(7)),fr23 mwtacc fr16,acc8 mwtacc fr17,acc9 mwtacc fr18,acc10 mwtacc fr19,acc11 mwtaccg fr20,accg8 mwtaccg fr21,accg9 mwtaccg fr22,accg10 mwtaccg fr23,accg11 bra __restore_acc_cont # the FR555 also has ACC4-7/ACCG4-7 regs and an FSR0 reg __restore_acc_fr555: lddfi @(gr8,#__FPMEDIA_ACC(4)),fr16 lddfi @(gr8,#__FPMEDIA_ACC(6)),fr18 ldbfi @(gr8,#__FPMEDIA_ACCG(4)),fr20 ldbfi @(gr8,#__FPMEDIA_ACCG(5)),fr21 ldbfi @(gr8,#__FPMEDIA_ACCG(6)),fr22 ldbfi @(gr8,#__FPMEDIA_ACCG(7)),fr23 mnop.p mwtacc fr16,acc4 mnop.p mwtacc fr17,acc5 mnop.p mwtacc fr18,acc6 mnop.p mwtacc fr19,acc7 mnop.p mwtaccg fr20,accg4 mnop.p mwtaccg fr21,accg5 mnop.p mwtaccg fr22,accg6 mnop.p mwtaccg fr23,accg7 ldi @(gr8,#__FPMEDIA_FSR(0)),gr4 movgs gr4,fsr0 bra __restore_acc_cont ############################################################################### # # save extra general regs and FP/Media regs # - void save_user_regs(struct user_context *target) # ############################################################################### .globl save_user_regs save_user_regs: movsg hsr0,gr6 ori gr6,#HSR0_GRHE|HSR0_FRLE|HSR0_FRHE,gr6 movgs gr6,hsr0 movsg hsr0,gr6 movsg psr,gr7 ori gr7,#PSR_EF|PSR_EM,gr7 movgs gr7,psr movsg psr,gr7 srli gr7,#24,gr7 bar movsg fner0,gr4 movsg fner1,gr5 stdi.p gr4,@(gr8,#__FPMEDIA_FNER(0)) # some CPU's have GR32-GR63 setlos #HSR0_GRHE,gr4 andcc gr6,gr4,gr0,icc0 beq icc0,#1,__save_skip_gr32_gr63 stdi gr32,@(gr8,#__INT_GR(32)) stdi gr34,@(gr8,#__INT_GR(34)) stdi gr36,@(gr8,#__INT_GR(36)) stdi gr38,@(gr8,#__INT_GR(38)) stdi gr40,@(gr8,#__INT_GR(40)) stdi gr42,@(gr8,#__INT_GR(42)) stdi gr44,@(gr8,#__INT_GR(44)) stdi gr46,@(gr8,#__INT_GR(46)) stdi gr48,@(gr8,#__INT_GR(48)) stdi gr50,@(gr8,#__INT_GR(50)) stdi gr52,@(gr8,#__INT_GR(52)) stdi gr54,@(gr8,#__INT_GR(54)) stdi gr56,@(gr8,#__INT_GR(56)) stdi gr58,@(gr8,#__INT_GR(58)) stdi gr60,@(gr8,#__INT_GR(60)) stdi gr62,@(gr8,#__INT_GR(62)) __save_skip_gr32_gr63: # all CPU's have FR0-FR31 stdfi fr0 ,@(gr8,#__FPMEDIA_FR( 0)) stdfi fr2 ,@(gr8,#__FPMEDIA_FR( 2)) stdfi fr4 ,@(gr8,#__FPMEDIA_FR( 4)) stdfi fr6 ,@(gr8,#__FPMEDIA_FR( 6)) stdfi fr8 ,@(gr8,#__FPMEDIA_FR( 8)) stdfi fr10,@(gr8,#__FPMEDIA_FR(10)) stdfi fr12,@(gr8,#__FPMEDIA_FR(12)) stdfi fr14,@(gr8,#__FPMEDIA_FR(14)) stdfi fr16,@(gr8,#__FPMEDIA_FR(16)) stdfi fr18,@(gr8,#__FPMEDIA_FR(18)) stdfi fr20,@(gr8,#__FPMEDIA_FR(20)) stdfi fr22,@(gr8,#__FPMEDIA_FR(22)) stdfi fr24,@(gr8,#__FPMEDIA_FR(24)) stdfi fr26,@(gr8,#__FPMEDIA_FR(26)) stdfi fr28,@(gr8,#__FPMEDIA_FR(28)) stdfi.p fr30,@(gr8,#__FPMEDIA_FR(30)) # some CPU's have FR32-FR63 setlos #HSR0_FRHE,gr4 andcc gr6,gr4,gr0,icc0 beq icc0,#1,__save_skip_fr32_fr63 stdfi fr32,@(gr8,#__FPMEDIA_FR(32)) stdfi fr34,@(gr8,#__FPMEDIA_FR(34)) stdfi fr36,@(gr8,#__FPMEDIA_FR(36)) stdfi fr38,@(gr8,#__FPMEDIA_FR(38)) stdfi fr40,@(gr8,#__FPMEDIA_FR(40)) stdfi fr42,@(gr8,#__FPMEDIA_FR(42)) stdfi fr44,@(gr8,#__FPMEDIA_FR(44)) stdfi fr46,@(gr8,#__FPMEDIA_FR(46)) stdfi fr48,@(gr8,#__FPMEDIA_FR(48)) stdfi fr50,@(gr8,#__FPMEDIA_FR(50)) stdfi fr52,@(gr8,#__FPMEDIA_FR(52)) stdfi fr54,@(gr8,#__FPMEDIA_FR(54)) stdfi fr56,@(gr8,#__FPMEDIA_FR(56)) stdfi fr58,@(gr8,#__FPMEDIA_FR(58)) stdfi fr60,@(gr8,#__FPMEDIA_FR(60)) stdfi fr62,@(gr8,#__FPMEDIA_FR(62)) __save_skip_fr32_fr63: mrdacc acc0 ,fr4 mrdacc acc1 ,fr5 stdfi.p fr4 ,@(gr8,#__FPMEDIA_ACC(0)) mrdacc acc2 ,fr6 mrdacc acc3 ,fr7 stdfi.p fr6 ,@(gr8,#__FPMEDIA_ACC(2)) mrdaccg accg0,fr4 stbfi.p fr4 ,@(gr8,#__FPMEDIA_ACCG(0)) mrdaccg accg1,fr5 stbfi.p fr5 ,@(gr8,#__FPMEDIA_ACCG(1)) mrdaccg accg2,fr6 stbfi.p fr6 ,@(gr8,#__FPMEDIA_ACCG(2)) mrdaccg accg3,fr7 stbfi fr7 ,@(gr8,#__FPMEDIA_ACCG(3)) movsg msr0 ,gr4 movsg msr1 ,gr5 stdi gr4 ,@(gr8,#__FPMEDIA_MSR(0)) # some CPUs have extra ACCx and ACCGx regs and maybe FSRx regs subicc.p gr7,#0x50,gr0,icc0 subicc gr7,#0x31,gr0,icc1 beq icc0,#0,__save_acc_fr451 beq icc1,#0,__save_acc_fr555 __save_acc_cont: lddfi @(gr8,#__FPMEDIA_FR(4)),fr4 lddfi.p @(gr8,#__FPMEDIA_FR(6)),fr6 bralr # the FR451 also has ACC8-11/ACCG8-11 regs (but not 4-7...) __save_acc_fr451: mrdacc acc8 ,fr4 mrdacc acc9 ,fr5 stdfi.p fr4 ,@(gr8,#__FPMEDIA_ACC(4)) mrdacc acc10,fr6 mrdacc acc11,fr7 stdfi.p fr6 ,@(gr8,#__FPMEDIA_ACC(6)) mrdaccg accg8,fr4 stbfi.p fr4 ,@(gr8,#__FPMEDIA_ACCG(4)) mrdaccg accg9,fr5 stbfi.p fr5 ,@(gr8,#__FPMEDIA_ACCG(5)) mrdaccg accg10,fr6 stbfi.p fr6 ,@(gr8,#__FPMEDIA_ACCG(6)) mrdaccg accg11,fr7 stbfi fr7 ,@(gr8,#__FPMEDIA_ACCG(7)) bra __save_acc_cont # the FR555 also has ACC4-7/ACCG4-7 regs and an FSR0 reg __save_acc_fr555: mnop.p mrdacc acc4 ,fr4 mnop.p mrdacc acc5 ,fr5 stdfi fr4 ,@(gr8,#__FPMEDIA_ACC(4)) mnop.p mrdacc acc6 ,fr6 mnop.p mrdacc acc7 ,fr7 stdfi fr6 ,@(gr8,#__FPMEDIA_ACC(6)) mnop.p mrdaccg accg4,fr4 stbfi fr4 ,@(gr8,#__FPMEDIA_ACCG(4)) mnop.p mrdaccg accg5,fr5 stbfi fr5 ,@(gr8,#__FPMEDIA_ACCG(5)) mnop.p mrdaccg accg6,fr6 stbfi fr6 ,@(gr8,#__FPMEDIA_ACCG(6)) mnop.p mrdaccg accg7,fr7 stbfi fr7 ,@(gr8,#__FPMEDIA_ACCG(7)) movsg fsr0 ,gr4 sti gr4 ,@(gr8,#__FPMEDIA_FSR(0)) bra __save_acc_cont |