1/* 2 * This file contains the light-weight system call handlers (fsyscall-handlers). 3 * 4 * Copyright (C) 2003 Hewlett-Packard Co 5 * David Mosberger-Tang <davidm@hpl.hp.com> 6 * 7 * 25-Sep-03 davidm Implement fsys_rt_sigprocmask(). 8 * 18-Feb-03 louisk Implement fsys_gettimeofday(). 9 * 28-Feb-03 davidm Fixed several bugs in fsys_gettimeofday(). Tuned it some more, 10 * probably broke it along the way... ;-) 11 * 13-Jul-04 clameter Implement fsys_clock_gettime and revise fsys_gettimeofday to make 12 * it capable of using memory based clocks without falling back to C code. 13 * 08-Feb-07 Fenghua Yu Implement fsys_getcpu. 14 * 15 */ 16 17#include <asm/asmmacro.h> 18#include <asm/errno.h> 19#include <asm/asm-offsets.h> 20#include <asm/percpu.h> 21#include <asm/thread_info.h> 22#include <asm/sal.h> 23#include <asm/signal.h> 24#include <asm/system.h> 25#include <asm/unistd.h> 26 27#include "entry.h" 28#include "paravirt_inst.h" 29 30/* 31 * See Documentation/ia64/fsys.txt for details on fsyscalls. 32 * 33 * On entry to an fsyscall handler: 34 * r10 = 0 (i.e., defaults to "successful syscall return") 35 * r11 = saved ar.pfs (a user-level value) 36 * r15 = system call number 37 * r16 = "current" task pointer (in normal kernel-mode, this is in r13) 38 * r32-r39 = system call arguments 39 * b6 = return address (a user-level value) 40 * ar.pfs = previous frame-state (a user-level value) 41 * PSR.be = cleared to zero (i.e., little-endian byte order is in effect) 42 * all other registers may contain values passed in from user-mode 43 * 44 * On return from an fsyscall handler: 45 * r11 = saved ar.pfs (as passed into the fsyscall handler) 46 * r15 = system call number (as passed into the fsyscall handler) 47 * r32-r39 = system call arguments (as passed into the fsyscall handler) 48 * b6 = return address (as passed into the fsyscall handler) 49 * ar.pfs = previous frame-state (as passed into the fsyscall handler) 50 */ 51 52ENTRY(fsys_ni_syscall) 53 .prologue 54 .altrp b6 55 .body 56 mov r8=ENOSYS 57 mov r10=-1 58 FSYS_RETURN 59END(fsys_ni_syscall) 60 61ENTRY(fsys_getpid) 62 .prologue 63 .altrp b6 64 .body 65 add r17=IA64_TASK_GROUP_LEADER_OFFSET,r16 66 ;; 67 ld8 r17=[r17] // r17 = current->group_leader 68 add r9=TI_FLAGS+IA64_TASK_SIZE,r16 69 ;; 70 ld4 r9=[r9] 71 add r17=IA64_TASK_TGIDLINK_OFFSET,r17 72 ;; 73 and r9=TIF_ALLWORK_MASK,r9 74 ld8 r17=[r17] // r17 = current->group_leader->pids[PIDTYPE_PID].pid 75 ;; 76 add r8=IA64_PID_LEVEL_OFFSET,r17 77 ;; 78 ld4 r8=[r8] // r8 = pid->level 79 add r17=IA64_PID_UPID_OFFSET,r17 // r17 = &pid->numbers[0] 80 ;; 81 shl r8=r8,IA64_UPID_SHIFT 82 ;; 83 add r17=r17,r8 // r17 = &pid->numbers[pid->level] 84 ;; 85 ld4 r8=[r17] // r8 = pid->numbers[pid->level].nr 86 ;; 87 mov r17=0 88 ;; 89 cmp.ne p8,p0=0,r9 90(p8) br.spnt.many fsys_fallback_syscall 91 FSYS_RETURN 92END(fsys_getpid) 93 94ENTRY(fsys_getppid) 95 .prologue 96 .altrp b6 97 .body 98 add r17=IA64_TASK_GROUP_LEADER_OFFSET,r16 99 ;; 100 ld8 r17=[r17] // r17 = current->group_leader 101 add r9=TI_FLAGS+IA64_TASK_SIZE,r16 102 ;; 103 104 ld4 r9=[r9] 105 add r17=IA64_TASK_REAL_PARENT_OFFSET,r17 // r17 = ¤t->group_leader->real_parent 106 ;; 107 and r9=TIF_ALLWORK_MASK,r9 108 1091: ld8 r18=[r17] // r18 = current->group_leader->real_parent 110 ;; 111 cmp.ne p8,p0=0,r9 112 add r8=IA64_TASK_TGID_OFFSET,r18 // r8 = ¤t->group_leader->real_parent->tgid 113 ;; 114 115 /* 116 * The .acq is needed to ensure that the read of tgid has returned its data before 117 * we re-check "real_parent". 118 */ 119 ld4.acq r8=[r8] // r8 = current->group_leader->real_parent->tgid 120#ifdef CONFIG_SMP 121 /* 122 * Re-read current->group_leader->real_parent. 123 */ 124 ld8 r19=[r17] // r19 = current->group_leader->real_parent 125(p8) br.spnt.many fsys_fallback_syscall 126 ;; 127 cmp.ne p6,p0=r18,r19 // did real_parent change? 128 mov r19=0 // i must not leak kernel bits... 129(p6) br.cond.spnt.few 1b // yes -> redo the read of tgid and the check 130 ;; 131 mov r17=0 // i must not leak kernel bits... 132 mov r18=0 // i must not leak kernel bits... 133#else 134 mov r17=0 // i must not leak kernel bits... 135 mov r18=0 // i must not leak kernel bits... 136 mov r19=0 // i must not leak kernel bits... 137#endif 138 FSYS_RETURN 139END(fsys_getppid) 140 141ENTRY(fsys_set_tid_address) 142 .prologue 143 .altrp b6 144 .body 145 add r9=TI_FLAGS+IA64_TASK_SIZE,r16 146 add r17=IA64_TASK_TGIDLINK_OFFSET,r16 147 ;; 148 ld4 r9=[r9] 149 tnat.z p6,p7=r32 // check argument register for being NaT 150 ld8 r17=[r17] // r17 = current->pids[PIDTYPE_PID].pid 151 ;; 152 and r9=TIF_ALLWORK_MASK,r9 153 add r8=IA64_PID_LEVEL_OFFSET,r17 154 add r18=IA64_TASK_CLEAR_CHILD_TID_OFFSET,r16 155 ;; 156 ld4 r8=[r8] // r8 = pid->level 157 add r17=IA64_PID_UPID_OFFSET,r17 // r17 = &pid->numbers[0] 158 ;; 159 shl r8=r8,IA64_UPID_SHIFT 160 ;; 161 add r17=r17,r8 // r17 = &pid->numbers[pid->level] 162 ;; 163 ld4 r8=[r17] // r8 = pid->numbers[pid->level].nr 164 ;; 165 cmp.ne p8,p0=0,r9 166 mov r17=-1 167 ;; 168(p6) st8 [r18]=r32 169(p7) st8 [r18]=r17 170(p8) br.spnt.many fsys_fallback_syscall 171 ;; 172 mov r17=0 // i must not leak kernel bits... 173 mov r18=0 // i must not leak kernel bits... 174 FSYS_RETURN 175END(fsys_set_tid_address) 176 177#if IA64_GTOD_LOCK_OFFSET !=0 178#error fsys_gettimeofday incompatible with changes to struct fsyscall_gtod_data_t 179#endif 180#if IA64_ITC_JITTER_OFFSET !=0 181#error fsys_gettimeofday incompatible with changes to struct itc_jitter_data_t 182#endif 183#define CLOCK_REALTIME 0 184#define CLOCK_MONOTONIC 1 185#define CLOCK_DIVIDE_BY_1000 0x4000 186#define CLOCK_ADD_MONOTONIC 0x8000 187 188ENTRY(fsys_gettimeofday) 189 .prologue 190 .altrp b6 191 .body 192 mov r31 = r32 193 tnat.nz p6,p0 = r33 // guard against NaT argument 194(p6) br.cond.spnt.few .fail_einval 195 mov r30 = CLOCK_DIVIDE_BY_1000 196 ;; 197.gettime: 198 // Register map 199 // Incoming r31 = pointer to address where to place result 200 // r30 = flags determining how time is processed 201 // r2,r3 = temp r4-r7 preserved 202 // r8 = result nanoseconds 203 // r9 = result seconds 204 // r10 = temporary storage for clock difference 205 // r11 = preserved: saved ar.pfs 206 // r12 = preserved: memory stack 207 // r13 = preserved: thread pointer 208 // r14 = address of mask / mask value 209 // r15 = preserved: system call number 210 // r16 = preserved: current task pointer 211 // r17 = (not used) 212 // r18 = (not used) 213 // r19 = address of itc_lastcycle 214 // r20 = struct fsyscall_gtod_data (= address of gtod_lock.sequence) 215 // r21 = address of mmio_ptr 216 // r22 = address of wall_time or monotonic_time 217 // r23 = address of shift / value 218 // r24 = address mult factor / cycle_last value 219 // r25 = itc_lastcycle value 220 // r26 = address clocksource cycle_last 221 // r27 = (not used) 222 // r28 = sequence number at the beginning of critcal section 223 // r29 = address of itc_jitter 224 // r30 = time processing flags / memory address 225 // r31 = pointer to result 226 // Predicates 227 // p6,p7 short term use 228 // p8 = timesource ar.itc 229 // p9 = timesource mmio64 230 // p10 = timesource mmio32 - not used 231 // p11 = timesource not to be handled by asm code 232 // p12 = memory time source ( = p9 | p10) - not used 233 // p13 = do cmpxchg with itc_lastcycle 234 // p14 = Divide by 1000 235 // p15 = Add monotonic 236 // 237 // Note that instructions are optimized for McKinley. McKinley can 238 // process two bundles simultaneously and therefore we continuously 239 // try to feed the CPU two bundles and then a stop. 240 241 add r2 = TI_FLAGS+IA64_TASK_SIZE,r16 242 tnat.nz p6,p0 = r31 // guard against Nat argument 243(p6) br.cond.spnt.few .fail_einval 244 movl r20 = fsyscall_gtod_data // load fsyscall gettimeofday data address 245 ;; 246 ld4 r2 = [r2] // process work pending flags 247 movl r29 = itc_jitter_data // itc_jitter 248 add r22 = IA64_GTOD_WALL_TIME_OFFSET,r20 // wall_time 249 add r21 = IA64_CLKSRC_MMIO_OFFSET,r20 250 mov pr = r30,0xc000 // Set predicates according to function 251 ;; 252 and r2 = TIF_ALLWORK_MASK,r2 253 add r19 = IA64_ITC_LASTCYCLE_OFFSET,r29 254(p15) add r22 = IA64_GTOD_MONO_TIME_OFFSET,r20 // monotonic_time 255 ;; 256 add r26 = IA64_CLKSRC_CYCLE_LAST_OFFSET,r20 // clksrc_cycle_last 257 cmp.ne p6, p0 = 0, r2 // Fallback if work is scheduled 258(p6) br.cond.spnt.many fsys_fallback_syscall 259 ;; 260 // Begin critical section 261.time_redo: 262 ld4.acq r28 = [r20] // gtod_lock.sequence, Must take first 263 ;; 264 and r28 = ~1,r28 // And make sequence even to force retry if odd 265 ;; 266 ld8 r30 = [r21] // clocksource->mmio_ptr 267 add r24 = IA64_CLKSRC_MULT_OFFSET,r20 268 ld4 r2 = [r29] // itc_jitter value 269 add r23 = IA64_CLKSRC_SHIFT_OFFSET,r20 270 add r14 = IA64_CLKSRC_MASK_OFFSET,r20 271 ;; 272 ld4 r3 = [r24] // clocksource mult value 273 ld8 r14 = [r14] // clocksource mask value 274 cmp.eq p8,p9 = 0,r30 // use cpu timer if no mmio_ptr 275 ;; 276 setf.sig f7 = r3 // Setup for mult scaling of counter 277(p8) cmp.ne p13,p0 = r2,r0 // need itc_jitter compensation, set p13 278 ld4 r23 = [r23] // clocksource shift value 279 ld8 r24 = [r26] // get clksrc_cycle_last value 280(p9) cmp.eq p13,p0 = 0,r30 // if mmio_ptr, clear p13 jitter control 281 ;; 282 .pred.rel.mutex p8,p9 283 MOV_FROM_ITC(p8, p6, r2, r10) // CPU_TIMER. 36 clocks latency!!! 284(p9) ld8 r2 = [r30] // MMIO_TIMER. Could also have latency issues.. 285(p13) ld8 r25 = [r19] // get itc_lastcycle value 286 ld8 r9 = [r22],IA64_TIMESPEC_TV_NSEC_OFFSET // tv_sec 287 ;; 288 ld8 r8 = [r22],-IA64_TIMESPEC_TV_NSEC_OFFSET // tv_nsec 289(p13) sub r3 = r25,r2 // Diff needed before comparison (thanks davidm) 290 ;; 291(p13) cmp.gt.unc p6,p7 = r3,r0 // check if it is less than last. p6,p7 cleared 292 sub r10 = r2,r24 // current_cycle - last_cycle 293 ;; 294(p6) sub r10 = r25,r24 // time we got was less than last_cycle 295(p7) mov ar.ccv = r25 // more than last_cycle. Prep for cmpxchg 296 ;; 297(p7) cmpxchg8.rel r3 = [r19],r2,ar.ccv 298 ;; 299(p7) cmp.ne p7,p0 = r25,r3 // if cmpxchg not successful 300 ;; 301(p7) sub r10 = r3,r24 // then use new last_cycle instead 302 ;; 303 and r10 = r10,r14 // Apply mask 304 ;; 305 setf.sig f8 = r10 306 nop.i 123 307 ;; 308 // fault check takes 5 cycles and we have spare time 309EX(.fail_efault, probe.w.fault r31, 3) 310 xmpy.l f8 = f8,f7 // nsec_per_cyc*(counter-last_counter) 311 ;; 312 getf.sig r2 = f8 313 mf 314 ;; 315 ld4 r10 = [r20] // gtod_lock.sequence 316 shr.u r2 = r2,r23 // shift by factor 317 ;; 318 add r8 = r8,r2 // Add xtime.nsecs 319 cmp4.ne p7,p0 = r28,r10 320(p7) br.cond.dpnt.few .time_redo // sequence number changed, redo 321 // End critical section. 322 // Now r8=tv->tv_nsec and r9=tv->tv_sec 323 mov r10 = r0 324 movl r2 = 1000000000 325 add r23 = IA64_TIMESPEC_TV_NSEC_OFFSET, r31 326(p14) movl r3 = 2361183241434822607 // Prep for / 1000 hack 327 ;; 328.time_normalize: 329 mov r21 = r8 330 cmp.ge p6,p0 = r8,r2 331(p14) shr.u r20 = r8, 3 // We can repeat this if necessary just wasting time 332 ;; 333(p14) setf.sig f8 = r20 334(p6) sub r8 = r8,r2 335(p6) add r9 = 1,r9 // two nops before the branch. 336(p14) setf.sig f7 = r3 // Chances for repeats are 1 in 10000 for gettod 337(p6) br.cond.dpnt.few .time_normalize 338 ;; 339 // Divided by 8 though shift. Now divide by 125 340 // The compiler was able to do that with a multiply 341 // and a shift and we do the same 342EX(.fail_efault, probe.w.fault r23, 3) // This also costs 5 cycles 343(p14) xmpy.hu f8 = f8, f7 // xmpy has 5 cycles latency so use it 344 ;; 345(p14) getf.sig r2 = f8 346 ;; 347 mov r8 = r0 348(p14) shr.u r21 = r2, 4 349 ;; 350EX(.fail_efault, st8 [r31] = r9) 351EX(.fail_efault, st8 [r23] = r21) 352 FSYS_RETURN 353.fail_einval: 354 mov r8 = EINVAL 355 mov r10 = -1 356 FSYS_RETURN 357.fail_efault: 358 mov r8 = EFAULT 359 mov r10 = -1 360 FSYS_RETURN 361END(fsys_gettimeofday) 362 363ENTRY(fsys_clock_gettime) 364 .prologue 365 .altrp b6 366 .body 367 cmp4.ltu p6, p0 = CLOCK_MONOTONIC, r32 368 // Fallback if this is not CLOCK_REALTIME or CLOCK_MONOTONIC 369(p6) br.spnt.few fsys_fallback_syscall 370 mov r31 = r33 371 shl r30 = r32,15 372 br.many .gettime 373END(fsys_clock_gettime) 374 375/* 376 * long fsys_rt_sigprocmask (int how, sigset_t *set, sigset_t *oset, size_t sigsetsize). 377 */ 378#if _NSIG_WORDS != 1 379# error Sorry, fsys_rt_sigprocmask() needs to be updated for _NSIG_WORDS != 1. 380#endif 381ENTRY(fsys_rt_sigprocmask) 382 .prologue 383 .altrp b6 384 .body 385 386 add r2=IA64_TASK_BLOCKED_OFFSET,r16 387 add r9=TI_FLAGS+IA64_TASK_SIZE,r16 388 cmp4.ltu p6,p0=SIG_SETMASK,r32 389 390 cmp.ne p15,p0=r0,r34 // oset != NULL? 391 tnat.nz p8,p0=r34 392 add r31=IA64_TASK_SIGHAND_OFFSET,r16 393 ;; 394 ld8 r3=[r2] // read/prefetch current->blocked 395 ld4 r9=[r9] 396 tnat.nz.or p6,p0=r35 397 398 cmp.ne.or p6,p0=_NSIG_WORDS*8,r35 399 tnat.nz.or p6,p0=r32 400(p6) br.spnt.few .fail_einval // fail with EINVAL 401 ;; 402#ifdef CONFIG_SMP 403 ld8 r31=[r31] // r31 <- current->sighand 404#endif 405 and r9=TIF_ALLWORK_MASK,r9 406 tnat.nz.or p8,p0=r33 407 ;; 408 cmp.ne p7,p0=0,r9 409 cmp.eq p6,p0=r0,r33 // set == NULL? 410 add r31=IA64_SIGHAND_SIGLOCK_OFFSET,r31 // r31 <- current->sighand->siglock 411(p8) br.spnt.few .fail_efault // fail with EFAULT 412(p7) br.spnt.many fsys_fallback_syscall // got pending kernel work... 413(p6) br.dpnt.many .store_mask // -> short-circuit to just reading the signal mask 414 415 /* Argh, we actually have to do some work and _update_ the signal mask: */ 416 417EX(.fail_efault, probe.r.fault r33, 3) // verify user has read-access to *set 418EX(.fail_efault, ld8 r14=[r33]) // r14 <- *set 419 mov r17=(1 << (SIGKILL - 1)) | (1 << (SIGSTOP - 1)) 420 ;; 421 422 RSM_PSR_I(p0, r18, r19) // mask interrupt delivery 423 mov ar.ccv=0 424 andcm r14=r14,r17 // filter out SIGKILL & SIGSTOP 425 426#ifdef CONFIG_SMP 427 mov r17=1 428 ;; 429 cmpxchg4.acq r18=[r31],r17,ar.ccv // try to acquire the lock 430 mov r8=EINVAL // default to EINVAL 431 ;; 432 ld8 r3=[r2] // re-read current->blocked now that we hold the lock 433 cmp4.ne p6,p0=r18,r0 434(p6) br.cond.spnt.many .lock_contention 435 ;; 436#else 437 ld8 r3=[r2] // re-read current->blocked now that we hold the lock 438 mov r8=EINVAL // default to EINVAL 439#endif 440 add r18=IA64_TASK_PENDING_OFFSET+IA64_SIGPENDING_SIGNAL_OFFSET,r16 441 add r19=IA64_TASK_SIGNAL_OFFSET,r16 442 cmp4.eq p6,p0=SIG_BLOCK,r32 443 ;; 444 ld8 r19=[r19] // r19 <- current->signal 445 cmp4.eq p7,p0=SIG_UNBLOCK,r32 446 cmp4.eq p8,p0=SIG_SETMASK,r32 447 ;; 448 ld8 r18=[r18] // r18 <- current->pending.signal 449 .pred.rel.mutex p6,p7,p8 450(p6) or r14=r3,r14 // SIG_BLOCK 451(p7) andcm r14=r3,r14 // SIG_UNBLOCK 452 453(p8) mov r14=r14 // SIG_SETMASK 454(p6) mov r8=0 // clear error code 455 // recalc_sigpending() 456 add r17=IA64_SIGNAL_GROUP_STOP_COUNT_OFFSET,r19 457 458 add r19=IA64_SIGNAL_SHARED_PENDING_OFFSET+IA64_SIGPENDING_SIGNAL_OFFSET,r19 459 ;; 460 ld4 r17=[r17] // r17 <- current->signal->group_stop_count 461(p7) mov r8=0 // clear error code 462 463 ld8 r19=[r19] // r19 <- current->signal->shared_pending 464 ;; 465 cmp4.gt p6,p7=r17,r0 // p6/p7 <- (current->signal->group_stop_count > 0)? 466(p8) mov r8=0 // clear error code 467 468 or r18=r18,r19 // r18 <- current->pending | current->signal->shared_pending 469 ;; 470 // r18 <- (current->pending | current->signal->shared_pending) & ~current->blocked: 471 andcm r18=r18,r14 472 add r9=TI_FLAGS+IA64_TASK_SIZE,r16 473 ;; 474 475(p7) cmp.ne.or.andcm p6,p7=r18,r0 // p6/p7 <- signal pending 476 mov r19=0 // i must not leak kernel bits... 477(p6) br.cond.dpnt.many .sig_pending 478 ;; 479 4801: ld4 r17=[r9] // r17 <- current->thread_info->flags 481 ;; 482 mov ar.ccv=r17 483 and r18=~_TIF_SIGPENDING,r17 // r18 <- r17 & ~(1 << TIF_SIGPENDING) 484 ;; 485 486 st8 [r2]=r14 // update current->blocked with new mask 487 cmpxchg4.acq r8=[r9],r18,ar.ccv // current->thread_info->flags <- r18 488 ;; 489 cmp.ne p6,p0=r17,r8 // update failed? 490(p6) br.cond.spnt.few 1b // yes -> retry 491 492#ifdef CONFIG_SMP 493 st4.rel [r31]=r0 // release the lock 494#endif 495 SSM_PSR_I(p0, p9, r31) 496 ;; 497 498 srlz.d // ensure psr.i is set again 499 mov r18=0 // i must not leak kernel bits... 500 501.store_mask: 502EX(.fail_efault, (p15) probe.w.fault r34, 3) // verify user has write-access to *oset 503EX(.fail_efault, (p15) st8 [r34]=r3) 504 mov r2=0 // i must not leak kernel bits... 505 mov r3=0 // i must not leak kernel bits... 506 mov r8=0 // return 0 507 mov r9=0 // i must not leak kernel bits... 508 mov r14=0 // i must not leak kernel bits... 509 mov r17=0 // i must not leak kernel bits... 510 mov r31=0 // i must not leak kernel bits... 511 FSYS_RETURN 512 513.sig_pending: 514#ifdef CONFIG_SMP 515 st4.rel [r31]=r0 // release the lock 516#endif 517 SSM_PSR_I(p0, p9, r17) 518 ;; 519 srlz.d 520 br.sptk.many fsys_fallback_syscall // with signal pending, do the heavy-weight syscall 521 522#ifdef CONFIG_SMP 523.lock_contention: 524 /* Rather than spinning here, fall back on doing a heavy-weight syscall. */ 525 SSM_PSR_I(p0, p9, r17) 526 ;; 527 srlz.d 528 br.sptk.many fsys_fallback_syscall 529#endif 530END(fsys_rt_sigprocmask) 531 532/* 533 * fsys_getcpu doesn't use the third parameter in this implementation. It reads 534 * current_thread_info()->cpu and corresponding node in cpu_to_node_map. 535 */ 536ENTRY(fsys_getcpu) 537 .prologue 538 .altrp b6 539 .body 540 ;; 541 add r2=TI_FLAGS+IA64_TASK_SIZE,r16 542 tnat.nz p6,p0 = r32 // guard against NaT argument 543 add r3=TI_CPU+IA64_TASK_SIZE,r16 544 ;; 545 ld4 r3=[r3] // M r3 = thread_info->cpu 546 ld4 r2=[r2] // M r2 = thread_info->flags 547(p6) br.cond.spnt.few .fail_einval // B 548 ;; 549 tnat.nz p7,p0 = r33 // I guard against NaT argument 550(p7) br.cond.spnt.few .fail_einval // B 551#ifdef CONFIG_NUMA 552 movl r17=cpu_to_node_map 553 ;; 554EX(.fail_efault, probe.w.fault r32, 3) // M This takes 5 cycles 555EX(.fail_efault, probe.w.fault r33, 3) // M This takes 5 cycles 556 shladd r18=r3,1,r17 557 ;; 558 ld2 r20=[r18] // r20 = cpu_to_node_map[cpu] 559 and r2 = TIF_ALLWORK_MASK,r2 560 ;; 561 cmp.ne p8,p0=0,r2 562(p8) br.spnt.many fsys_fallback_syscall 563 ;; 564 ;; 565EX(.fail_efault, st4 [r32] = r3) 566EX(.fail_efault, st2 [r33] = r20) 567 mov r8=0 568 ;; 569#else 570EX(.fail_efault, probe.w.fault r32, 3) // M This takes 5 cycles 571EX(.fail_efault, probe.w.fault r33, 3) // M This takes 5 cycles 572 and r2 = TIF_ALLWORK_MASK,r2 573 ;; 574 cmp.ne p8,p0=0,r2 575(p8) br.spnt.many fsys_fallback_syscall 576 ;; 577EX(.fail_efault, st4 [r32] = r3) 578EX(.fail_efault, st2 [r33] = r0) 579 mov r8=0 580 ;; 581#endif 582 FSYS_RETURN 583END(fsys_getcpu) 584 585ENTRY(fsys_fallback_syscall) 586 .prologue 587 .altrp b6 588 .body 589 /* 590 * We only get here from light-weight syscall handlers. Thus, we already 591 * know that r15 contains a valid syscall number. No need to re-check. 592 */ 593 adds r17=-1024,r15 594 movl r14=sys_call_table 595 ;; 596 RSM_PSR_I(p0, r26, r27) 597 shladd r18=r17,3,r14 598 ;; 599 ld8 r18=[r18] // load normal (heavy-weight) syscall entry-point 600 MOV_FROM_PSR(p0, r29, r26) // read psr (12 cyc load latency) 601 mov r27=ar.rsc 602 mov r21=ar.fpsr 603 mov r26=ar.pfs 604END(fsys_fallback_syscall) 605 /* FALL THROUGH */ 606GLOBAL_ENTRY(paravirt_fsys_bubble_down) 607 .prologue 608 .altrp b6 609 .body 610 /* 611 * We get here for syscalls that don't have a lightweight 612 * handler. For those, we need to bubble down into the kernel 613 * and that requires setting up a minimal pt_regs structure, 614 * and initializing the CPU state more or less as if an 615 * interruption had occurred. To make syscall-restarts work, 616 * we setup pt_regs such that cr_iip points to the second 617 * instruction in syscall_via_break. Decrementing the IP 618 * hence will restart the syscall via break and not 619 * decrementing IP will return us to the caller, as usual. 620 * Note that we preserve the value of psr.pp rather than 621 * initializing it from dcr.pp. This makes it possible to 622 * distinguish fsyscall execution from other privileged 623 * execution. 624 * 625 * On entry: 626 * - normal fsyscall handler register usage, except 627 * that we also have: 628 * - r18: address of syscall entry point 629 * - r21: ar.fpsr 630 * - r26: ar.pfs 631 * - r27: ar.rsc 632 * - r29: psr 633 * 634 * We used to clear some PSR bits here but that requires slow 635 * serialization. Fortuntely, that isn't really necessary. 636 * The rationale is as follows: we used to clear bits 637 * ~PSR_PRESERVED_BITS in PSR.L. Since 638 * PSR_PRESERVED_BITS==PSR.{UP,MFL,MFH,PK,DT,PP,SP,RT,IC}, we 639 * ended up clearing PSR.{BE,AC,I,DFL,DFH,DI,DB,SI,TB}. 640 * However, 641 * 642 * PSR.BE : already is turned off in __kernel_syscall_via_epc() 643 * PSR.AC : don't care (kernel normally turns PSR.AC on) 644 * PSR.I : already turned off by the time paravirt_fsys_bubble_down gets 645 * invoked 646 * PSR.DFL: always 0 (kernel never turns it on) 647 * PSR.DFH: don't care --- kernel never touches f32-f127 on its own 648 * initiative 649 * PSR.DI : always 0 (kernel never turns it on) 650 * PSR.SI : always 0 (kernel never turns it on) 651 * PSR.DB : don't care --- kernel never enables kernel-level 652 * breakpoints 653 * PSR.TB : must be 0 already; if it wasn't zero on entry to 654 * __kernel_syscall_via_epc, the branch to paravirt_fsys_bubble_down 655 * will trigger a taken branch; the taken-trap-handler then 656 * converts the syscall into a break-based system-call. 657 */ 658 /* 659 * Reading psr.l gives us only bits 0-31, psr.it, and psr.mc. 660 * The rest we have to synthesize. 661 */ 662# define PSR_ONE_BITS ((3 << IA64_PSR_CPL0_BIT) \ 663 | (0x1 << IA64_PSR_RI_BIT) \ 664 | IA64_PSR_BN | IA64_PSR_I) 665 666 invala // M0|1 667 movl r14=ia64_ret_from_syscall // X 668 669 nop.m 0 670 movl r28=__kernel_syscall_via_break // X create cr.iip 671 ;; 672 673 mov r2=r16 // A get task addr to addl-addressable register 674 adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16 // A 675 mov r31=pr // I0 save pr (2 cyc) 676 ;; 677 st1 [r16]=r0 // M2|3 clear current->thread.on_ustack flag 678 addl r22=IA64_RBS_OFFSET,r2 // A compute base of RBS 679 add r3=TI_FLAGS+IA64_TASK_SIZE,r2 // A 680 ;; 681 ld4 r3=[r3] // M0|1 r3 = current_thread_info()->flags 682 lfetch.fault.excl.nt1 [r22] // M0|1 prefetch register backing-store 683 nop.i 0 684 ;; 685 mov ar.rsc=0 // M2 set enforced lazy mode, pl 0, LE, loadrs=0 686#ifdef CONFIG_VIRT_CPU_ACCOUNTING 687 MOV_FROM_ITC(p0, p6, r30, r23) // M get cycle for accounting 688#else 689 nop.m 0 690#endif 691 nop.i 0 692 ;; 693 mov r23=ar.bspstore // M2 (12 cyc) save ar.bspstore 694 mov.m r24=ar.rnat // M2 (5 cyc) read ar.rnat (dual-issues!) 695 nop.i 0 696 ;; 697 mov ar.bspstore=r22 // M2 (6 cyc) switch to kernel RBS 698 movl r8=PSR_ONE_BITS // X 699 ;; 700 mov r25=ar.unat // M2 (5 cyc) save ar.unat 701 mov r19=b6 // I0 save b6 (2 cyc) 702 mov r20=r1 // A save caller's gp in r20 703 ;; 704 or r29=r8,r29 // A construct cr.ipsr value to save 705 mov b6=r18 // I0 copy syscall entry-point to b6 (7 cyc) 706 addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r2 // A compute base of memory stack 707 708 mov r18=ar.bsp // M2 save (kernel) ar.bsp (12 cyc) 709 cmp.ne pKStk,pUStk=r0,r0 // A set pKStk <- 0, pUStk <- 1 710 br.call.sptk.many b7=ia64_syscall_setup // B 711 ;; 712#ifdef CONFIG_VIRT_CPU_ACCOUNTING 713 // mov.m r30=ar.itc is called in advance 714 add r16=TI_AC_STAMP+IA64_TASK_SIZE,r2 715 add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r2 716 ;; 717 ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP // time at last check in kernel 718 ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE // time at leave kernel 719 ;; 720 ld8 r20=[r16],TI_AC_STAMP-TI_AC_STIME // cumulated stime 721 ld8 r21=[r17] // cumulated utime 722 sub r22=r19,r18 // stime before leave kernel 723 ;; 724 st8 [r16]=r30,TI_AC_STIME-TI_AC_STAMP // update stamp 725 sub r18=r30,r19 // elapsed time in user mode 726 ;; 727 add r20=r20,r22 // sum stime 728 add r21=r21,r18 // sum utime 729 ;; 730 st8 [r16]=r20 // update stime 731 st8 [r17]=r21 // update utime 732 ;; 733#endif 734 mov ar.rsc=0x3 // M2 set eager mode, pl 0, LE, loadrs=0 735 mov rp=r14 // I0 set the real return addr 736 and r3=_TIF_SYSCALL_TRACEAUDIT,r3 // A 737 ;; 738 SSM_PSR_I(p0, p6, r22) // M2 we're on kernel stacks now, reenable irqs 739 cmp.eq p8,p0=r3,r0 // A 740(p10) br.cond.spnt.many ia64_ret_from_syscall // B return if bad call-frame or r15 is a NaT 741 742 nop.m 0 743(p8) br.call.sptk.many b6=b6 // B (ignore return address) 744 br.cond.spnt ia64_trace_syscall // B 745END(paravirt_fsys_bubble_down) 746 747 .rodata 748 .align 8 749 .globl paravirt_fsyscall_table 750 751 data8 paravirt_fsys_bubble_down 752paravirt_fsyscall_table: 753 data8 fsys_ni_syscall 754 data8 0 // exit // 1025 755 data8 0 // read 756 data8 0 // write 757 data8 0 // open 758 data8 0 // close 759 data8 0 // creat // 1030 760 data8 0 // link 761 data8 0 // unlink 762 data8 0 // execve 763 data8 0 // chdir 764 data8 0 // fchdir // 1035 765 data8 0 // utimes 766 data8 0 // mknod 767 data8 0 // chmod 768 data8 0 // chown 769 data8 0 // lseek // 1040 770 data8 fsys_getpid // getpid 771 data8 fsys_getppid // getppid 772 data8 0 // mount 773 data8 0 // umount 774 data8 0 // setuid // 1045 775 data8 0 // getuid 776 data8 0 // geteuid 777 data8 0 // ptrace 778 data8 0 // access 779 data8 0 // sync // 1050 780 data8 0 // fsync 781 data8 0 // fdatasync 782 data8 0 // kill 783 data8 0 // rename 784 data8 0 // mkdir // 1055 785 data8 0 // rmdir 786 data8 0 // dup 787 data8 0 // pipe 788 data8 0 // times 789 data8 0 // brk // 1060 790 data8 0 // setgid 791 data8 0 // getgid 792 data8 0 // getegid 793 data8 0 // acct 794 data8 0 // ioctl // 1065 795 data8 0 // fcntl 796 data8 0 // umask 797 data8 0 // chroot 798 data8 0 // ustat 799 data8 0 // dup2 // 1070 800 data8 0 // setreuid 801 data8 0 // setregid 802 data8 0 // getresuid 803 data8 0 // setresuid 804 data8 0 // getresgid // 1075 805 data8 0 // setresgid 806 data8 0 // getgroups 807 data8 0 // setgroups 808 data8 0 // getpgid 809 data8 0 // setpgid // 1080 810 data8 0 // setsid 811 data8 0 // getsid 812 data8 0 // sethostname 813 data8 0 // setrlimit 814 data8 0 // getrlimit // 1085 815 data8 0 // getrusage 816 data8 fsys_gettimeofday // gettimeofday 817 data8 0 // settimeofday 818 data8 0 // select 819 data8 0 // poll // 1090 820 data8 0 // symlink 821 data8 0 // readlink 822 data8 0 // uselib 823 data8 0 // swapon 824 data8 0 // swapoff // 1095 825 data8 0 // reboot 826 data8 0 // truncate 827 data8 0 // ftruncate 828 data8 0 // fchmod 829 data8 0 // fchown // 1100 830 data8 0 // getpriority 831 data8 0 // setpriority 832 data8 0 // statfs 833 data8 0 // fstatfs 834 data8 0 // gettid // 1105 835 data8 0 // semget 836 data8 0 // semop 837 data8 0 // semctl 838 data8 0 // msgget 839 data8 0 // msgsnd // 1110 840 data8 0 // msgrcv 841 data8 0 // msgctl 842 data8 0 // shmget 843 data8 0 // shmat 844 data8 0 // shmdt // 1115 845 data8 0 // shmctl 846 data8 0 // syslog 847 data8 0 // setitimer 848 data8 0 // getitimer 849 data8 0 // 1120 850 data8 0 851 data8 0 852 data8 0 // vhangup 853 data8 0 // lchown 854 data8 0 // remap_file_pages // 1125 855 data8 0 // wait4 856 data8 0 // sysinfo 857 data8 0 // clone 858 data8 0 // setdomainname 859 data8 0 // newuname // 1130 860 data8 0 // adjtimex 861 data8 0 862 data8 0 // init_module 863 data8 0 // delete_module 864 data8 0 // 1135 865 data8 0 866 data8 0 // quotactl 867 data8 0 // bdflush 868 data8 0 // sysfs 869 data8 0 // personality // 1140 870 data8 0 // afs_syscall 871 data8 0 // setfsuid 872 data8 0 // setfsgid 873 data8 0 // getdents 874 data8 0 // flock // 1145 875 data8 0 // readv 876 data8 0 // writev 877 data8 0 // pread64 878 data8 0 // pwrite64 879 data8 0 // sysctl // 1150 880 data8 0 // mmap 881 data8 0 // munmap 882 data8 0 // mlock 883 data8 0 // mlockall 884 data8 0 // mprotect // 1155 885 data8 0 // mremap 886 data8 0 // msync 887 data8 0 // munlock 888 data8 0 // munlockall 889 data8 0 // sched_getparam // 1160 890 data8 0 // sched_setparam 891 data8 0 // sched_getscheduler 892 data8 0 // sched_setscheduler 893 data8 0 // sched_yield 894 data8 0 // sched_get_priority_max // 1165 895 data8 0 // sched_get_priority_min 896 data8 0 // sched_rr_get_interval 897 data8 0 // nanosleep 898 data8 0 // nfsservctl 899 data8 0 // prctl // 1170 900 data8 0 // getpagesize 901 data8 0 // mmap2 902 data8 0 // pciconfig_read 903 data8 0 // pciconfig_write 904 data8 0 // perfmonctl // 1175 905 data8 0 // sigaltstack 906 data8 0 // rt_sigaction 907 data8 0 // rt_sigpending 908 data8 fsys_rt_sigprocmask // rt_sigprocmask 909 data8 0 // rt_sigqueueinfo // 1180 910 data8 0 // rt_sigreturn 911 data8 0 // rt_sigsuspend 912 data8 0 // rt_sigtimedwait 913 data8 0 // getcwd 914 data8 0 // capget // 1185 915 data8 0 // capset 916 data8 0 // sendfile 917 data8 0 918 data8 0 919 data8 0 // socket // 1190 920 data8 0 // bind 921 data8 0 // connect 922 data8 0 // listen 923 data8 0 // accept 924 data8 0 // getsockname // 1195 925 data8 0 // getpeername 926 data8 0 // socketpair 927 data8 0 // send 928 data8 0 // sendto 929 data8 0 // recv // 1200 930 data8 0 // recvfrom 931 data8 0 // shutdown 932 data8 0 // setsockopt 933 data8 0 // getsockopt 934 data8 0 // sendmsg // 1205 935 data8 0 // recvmsg 936 data8 0 // pivot_root 937 data8 0 // mincore 938 data8 0 // madvise 939 data8 0 // newstat // 1210 940 data8 0 // newlstat 941 data8 0 // newfstat 942 data8 0 // clone2 943 data8 0 // getdents64 944 data8 0 // getunwind // 1215 945 data8 0 // readahead 946 data8 0 // setxattr 947 data8 0 // lsetxattr 948 data8 0 // fsetxattr 949 data8 0 // getxattr // 1220 950 data8 0 // lgetxattr 951 data8 0 // fgetxattr 952 data8 0 // listxattr 953 data8 0 // llistxattr 954 data8 0 // flistxattr // 1225 955 data8 0 // removexattr 956 data8 0 // lremovexattr 957 data8 0 // fremovexattr 958 data8 0 // tkill 959 data8 0 // futex // 1230 960 data8 0 // sched_setaffinity 961 data8 0 // sched_getaffinity 962 data8 fsys_set_tid_address // set_tid_address 963 data8 0 // fadvise64_64 964 data8 0 // tgkill // 1235 965 data8 0 // exit_group 966 data8 0 // lookup_dcookie 967 data8 0 // io_setup 968 data8 0 // io_destroy 969 data8 0 // io_getevents // 1240 970 data8 0 // io_submit 971 data8 0 // io_cancel 972 data8 0 // epoll_create 973 data8 0 // epoll_ctl 974 data8 0 // epoll_wait // 1245 975 data8 0 // restart_syscall 976 data8 0 // semtimedop 977 data8 0 // timer_create 978 data8 0 // timer_settime 979 data8 0 // timer_gettime // 1250 980 data8 0 // timer_getoverrun 981 data8 0 // timer_delete 982 data8 0 // clock_settime 983 data8 fsys_clock_gettime // clock_gettime 984 data8 0 // clock_getres // 1255 985 data8 0 // clock_nanosleep 986 data8 0 // fstatfs64 987 data8 0 // statfs64 988 data8 0 // mbind 989 data8 0 // get_mempolicy // 1260 990 data8 0 // set_mempolicy 991 data8 0 // mq_open 992 data8 0 // mq_unlink 993 data8 0 // mq_timedsend 994 data8 0 // mq_timedreceive // 1265 995 data8 0 // mq_notify 996 data8 0 // mq_getsetattr 997 data8 0 // kexec_load 998 data8 0 // vserver 999 data8 0 // waitid // 1270 1000 data8 0 // add_key 1001 data8 0 // request_key 1002 data8 0 // keyctl 1003 data8 0 // ioprio_set 1004 data8 0 // ioprio_get // 1275 1005 data8 0 // move_pages 1006 data8 0 // inotify_init 1007 data8 0 // inotify_add_watch 1008 data8 0 // inotify_rm_watch 1009 data8 0 // migrate_pages // 1280 1010 data8 0 // openat 1011 data8 0 // mkdirat 1012 data8 0 // mknodat 1013 data8 0 // fchownat 1014 data8 0 // futimesat // 1285 1015 data8 0 // newfstatat 1016 data8 0 // unlinkat 1017 data8 0 // renameat 1018 data8 0 // linkat 1019 data8 0 // symlinkat // 1290 1020 data8 0 // readlinkat 1021 data8 0 // fchmodat 1022 data8 0 // faccessat 1023 data8 0 1024 data8 0 // 1295 1025 data8 0 // unshare 1026 data8 0 // splice 1027 data8 0 // set_robust_list 1028 data8 0 // get_robust_list 1029 data8 0 // sync_file_range // 1300 1030 data8 0 // tee 1031 data8 0 // vmsplice 1032 data8 0 1033 data8 fsys_getcpu // getcpu // 1304 1034 1035 // fill in zeros for the remaining entries 1036 .zero: 1037 .space paravirt_fsyscall_table + 8*NR_syscalls - .zero, 0 1038