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/unistd.h> 25 26#include "entry.h" 27#include "paravirt_inst.h" 28 29/* 30 * See Documentation/ia64/fsys.txt for details on fsyscalls. 31 * 32 * On entry to an fsyscall handler: 33 * r10 = 0 (i.e., defaults to "successful syscall return") 34 * r11 = saved ar.pfs (a user-level value) 35 * r15 = system call number 36 * r16 = "current" task pointer (in normal kernel-mode, this is in r13) 37 * r32-r39 = system call arguments 38 * b6 = return address (a user-level value) 39 * ar.pfs = previous frame-state (a user-level value) 40 * PSR.be = cleared to zero (i.e., little-endian byte order is in effect) 41 * all other registers may contain values passed in from user-mode 42 * 43 * On return from an fsyscall handler: 44 * r11 = saved ar.pfs (as passed into the fsyscall handler) 45 * r15 = system call number (as passed into the fsyscall handler) 46 * r32-r39 = system call arguments (as passed into the fsyscall handler) 47 * b6 = return address (as passed into the fsyscall handler) 48 * ar.pfs = previous frame-state (as passed into the fsyscall handler) 49 */ 50 51ENTRY(fsys_ni_syscall) 52 .prologue 53 .altrp b6 54 .body 55 mov r8=ENOSYS 56 mov r10=-1 57 FSYS_RETURN 58END(fsys_ni_syscall) 59 60ENTRY(fsys_getpid) 61 .prologue 62 .altrp b6 63 .body 64 add r17=IA64_TASK_GROUP_LEADER_OFFSET,r16 65 ;; 66 ld8 r17=[r17] // r17 = current->group_leader 67 add r9=TI_FLAGS+IA64_TASK_SIZE,r16 68 ;; 69 ld4 r9=[r9] 70 add r17=IA64_TASK_TGIDLINK_OFFSET,r17 71 ;; 72 and r9=TIF_ALLWORK_MASK,r9 73 ld8 r17=[r17] // r17 = current->group_leader->pids[PIDTYPE_PID].pid 74 ;; 75 add r8=IA64_PID_LEVEL_OFFSET,r17 76 ;; 77 ld4 r8=[r8] // r8 = pid->level 78 add r17=IA64_PID_UPID_OFFSET,r17 // r17 = &pid->numbers[0] 79 ;; 80 shl r8=r8,IA64_UPID_SHIFT 81 ;; 82 add r17=r17,r8 // r17 = &pid->numbers[pid->level] 83 ;; 84 ld4 r8=[r17] // r8 = pid->numbers[pid->level].nr 85 ;; 86 mov r17=0 87 ;; 88 cmp.ne p8,p0=0,r9 89(p8) br.spnt.many fsys_fallback_syscall 90 FSYS_RETURN 91END(fsys_getpid) 92 93ENTRY(fsys_getppid) 94 .prologue 95 .altrp b6 96 .body 97 add r17=IA64_TASK_GROUP_LEADER_OFFSET,r16 98 ;; 99 ld8 r17=[r17] // r17 = current->group_leader 100 add r9=TI_FLAGS+IA64_TASK_SIZE,r16 101 ;; 102 103 ld4 r9=[r9] 104 add r17=IA64_TASK_REAL_PARENT_OFFSET,r17 // r17 = ¤t->group_leader->real_parent 105 ;; 106 and r9=TIF_ALLWORK_MASK,r9 107 1081: ld8 r18=[r17] // r18 = current->group_leader->real_parent 109 ;; 110 cmp.ne p8,p0=0,r9 111 add r8=IA64_TASK_TGID_OFFSET,r18 // r8 = ¤t->group_leader->real_parent->tgid 112 ;; 113 114 /* 115 * The .acq is needed to ensure that the read of tgid has returned its data before 116 * we re-check "real_parent". 117 */ 118 ld4.acq r8=[r8] // r8 = current->group_leader->real_parent->tgid 119#ifdef CONFIG_SMP 120 /* 121 * Re-read current->group_leader->real_parent. 122 */ 123 ld8 r19=[r17] // r19 = current->group_leader->real_parent 124(p8) br.spnt.many fsys_fallback_syscall 125 ;; 126 cmp.ne p6,p0=r18,r19 // did real_parent change? 127 mov r19=0 // i must not leak kernel bits... 128(p6) br.cond.spnt.few 1b // yes -> redo the read of tgid and the check 129 ;; 130 mov r17=0 // i must not leak kernel bits... 131 mov r18=0 // i must not leak kernel bits... 132#else 133 mov r17=0 // i must not leak kernel bits... 134 mov r18=0 // i must not leak kernel bits... 135 mov r19=0 // i must not leak kernel bits... 136#endif 137 FSYS_RETURN 138END(fsys_getppid) 139 140ENTRY(fsys_set_tid_address) 141 .prologue 142 .altrp b6 143 .body 144 add r9=TI_FLAGS+IA64_TASK_SIZE,r16 145 add r17=IA64_TASK_TGIDLINK_OFFSET,r16 146 ;; 147 ld4 r9=[r9] 148 tnat.z p6,p7=r32 // check argument register for being NaT 149 ld8 r17=[r17] // r17 = current->pids[PIDTYPE_PID].pid 150 ;; 151 and r9=TIF_ALLWORK_MASK,r9 152 add r8=IA64_PID_LEVEL_OFFSET,r17 153 add r18=IA64_TASK_CLEAR_CHILD_TID_OFFSET,r16 154 ;; 155 ld4 r8=[r8] // r8 = pid->level 156 add r17=IA64_PID_UPID_OFFSET,r17 // r17 = &pid->numbers[0] 157 ;; 158 shl r8=r8,IA64_UPID_SHIFT 159 ;; 160 add r17=r17,r8 // r17 = &pid->numbers[pid->level] 161 ;; 162 ld4 r8=[r17] // r8 = pid->numbers[pid->level].nr 163 ;; 164 cmp.ne p8,p0=0,r9 165 mov r17=-1 166 ;; 167(p6) st8 [r18]=r32 168(p7) st8 [r18]=r17 169(p8) br.spnt.many fsys_fallback_syscall 170 ;; 171 mov r17=0 // i must not leak kernel bits... 172 mov r18=0 // i must not leak kernel bits... 173 FSYS_RETURN 174END(fsys_set_tid_address) 175 176#if IA64_GTOD_SEQ_OFFSET !=0 177#error fsys_gettimeofday incompatible with changes to struct fsyscall_gtod_data_t 178#endif 179#if IA64_ITC_JITTER_OFFSET !=0 180#error fsys_gettimeofday incompatible with changes to struct itc_jitter_data_t 181#endif 182#define CLOCK_REALTIME 0 183#define CLOCK_MONOTONIC 1 184#define CLOCK_DIVIDE_BY_1000 0x4000 185#define CLOCK_ADD_MONOTONIC 0x8000 186 187ENTRY(fsys_gettimeofday) 188 .prologue 189 .altrp b6 190 .body 191 mov r31 = r32 192 tnat.nz p6,p0 = r33 // guard against NaT argument 193(p6) br.cond.spnt.few .fail_einval 194 mov r30 = CLOCK_DIVIDE_BY_1000 195 ;; 196.gettime: 197 // Register map 198 // Incoming r31 = pointer to address where to place result 199 // r30 = flags determining how time is processed 200 // r2,r3 = temp r4-r7 preserved 201 // r8 = result nanoseconds 202 // r9 = result seconds 203 // r10 = temporary storage for clock difference 204 // r11 = preserved: saved ar.pfs 205 // r12 = preserved: memory stack 206 // r13 = preserved: thread pointer 207 // r14 = address of mask / mask value 208 // r15 = preserved: system call number 209 // r16 = preserved: current task pointer 210 // r17 = (not used) 211 // r18 = (not used) 212 // r19 = address of itc_lastcycle 213 // r20 = struct fsyscall_gtod_data (= address of gtod_lock.sequence) 214 // r21 = address of mmio_ptr 215 // r22 = address of wall_time or monotonic_time 216 // r23 = address of shift / value 217 // r24 = address mult factor / cycle_last value 218 // r25 = itc_lastcycle value 219 // r26 = address clocksource cycle_last 220 // r27 = (not used) 221 // r28 = sequence number at the beginning of critcal section 222 // r29 = address of itc_jitter 223 // r30 = time processing flags / memory address 224 // r31 = pointer to result 225 // Predicates 226 // p6,p7 short term use 227 // p8 = timesource ar.itc 228 // p9 = timesource mmio64 229 // p10 = timesource mmio32 - not used 230 // p11 = timesource not to be handled by asm code 231 // p12 = memory time source ( = p9 | p10) - not used 232 // p13 = do cmpxchg with itc_lastcycle 233 // p14 = Divide by 1000 234 // p15 = Add monotonic 235 // 236 // Note that instructions are optimized for McKinley. McKinley can 237 // process two bundles simultaneously and therefore we continuously 238 // try to feed the CPU two bundles and then a stop. 239 240 add r2 = TI_FLAGS+IA64_TASK_SIZE,r16 241 tnat.nz p6,p0 = r31 // guard against Nat argument 242(p6) br.cond.spnt.few .fail_einval 243 movl r20 = fsyscall_gtod_data // load fsyscall gettimeofday data address 244 ;; 245 ld4 r2 = [r2] // process work pending flags 246 movl r29 = itc_jitter_data // itc_jitter 247 add r22 = IA64_GTOD_WALL_TIME_OFFSET,r20 // wall_time 248 add r21 = IA64_CLKSRC_MMIO_OFFSET,r20 249 mov pr = r30,0xc000 // Set predicates according to function 250 ;; 251 and r2 = TIF_ALLWORK_MASK,r2 252 add r19 = IA64_ITC_LASTCYCLE_OFFSET,r29 253(p15) add r22 = IA64_GTOD_MONO_TIME_OFFSET,r20 // monotonic_time 254 ;; 255 add r26 = IA64_CLKSRC_CYCLE_LAST_OFFSET,r20 // clksrc_cycle_last 256 cmp.ne p6, p0 = 0, r2 // Fallback if work is scheduled 257(p6) br.cond.spnt.many fsys_fallback_syscall 258 ;; 259 // Begin critical section 260.time_redo: 261 ld4.acq r28 = [r20] // gtod_lock.sequence, Must take first 262 ;; 263 and r28 = ~1,r28 // And make sequence even to force retry if odd 264 ;; 265 ld8 r30 = [r21] // clocksource->mmio_ptr 266 add r24 = IA64_CLKSRC_MULT_OFFSET,r20 267 ld4 r2 = [r29] // itc_jitter value 268 add r23 = IA64_CLKSRC_SHIFT_OFFSET,r20 269 add r14 = IA64_CLKSRC_MASK_OFFSET,r20 270 ;; 271 ld4 r3 = [r24] // clocksource mult value 272 ld8 r14 = [r14] // clocksource mask value 273 cmp.eq p8,p9 = 0,r30 // use cpu timer if no mmio_ptr 274 ;; 275 setf.sig f7 = r3 // Setup for mult scaling of counter 276(p8) cmp.ne p13,p0 = r2,r0 // need itc_jitter compensation, set p13 277 ld4 r23 = [r23] // clocksource shift value 278 ld8 r24 = [r26] // get clksrc_cycle_last value 279(p9) cmp.eq p13,p0 = 0,r30 // if mmio_ptr, clear p13 jitter control 280 ;; 281 .pred.rel.mutex p8,p9 282 MOV_FROM_ITC(p8, p6, r2, r10) // CPU_TIMER. 36 clocks latency!!! 283(p9) ld8 r2 = [r30] // MMIO_TIMER. Could also have latency issues.. 284(p13) ld8 r25 = [r19] // get itc_lastcycle value 285 ld8 r9 = [r22],IA64_TIMESPEC_TV_NSEC_OFFSET // tv_sec 286 ;; 287 ld8 r8 = [r22],-IA64_TIMESPEC_TV_NSEC_OFFSET // tv_nsec 288(p13) sub r3 = r25,r2 // Diff needed before comparison (thanks davidm) 289 ;; 290(p13) cmp.gt.unc p6,p7 = r3,r0 // check if it is less than last. p6,p7 cleared 291 sub r10 = r2,r24 // current_cycle - last_cycle 292 ;; 293(p6) sub r10 = r25,r24 // time we got was less than last_cycle 294(p7) mov ar.ccv = r25 // more than last_cycle. Prep for cmpxchg 295 ;; 296(p7) cmpxchg8.rel r3 = [r19],r2,ar.ccv 297 ;; 298(p7) cmp.ne p7,p0 = r25,r3 // if cmpxchg not successful 299 ;; 300(p7) sub r10 = r3,r24 // then use new last_cycle instead 301 ;; 302 and r10 = r10,r14 // Apply mask 303 ;; 304 setf.sig f8 = r10 305 nop.i 123 306 ;; 307 // fault check takes 5 cycles and we have spare time 308EX(.fail_efault, probe.w.fault r31, 3) 309 xmpy.l f8 = f8,f7 // nsec_per_cyc*(counter-last_counter) 310 ;; 311 getf.sig r2 = f8 312 mf 313 ;; 314 ld4 r10 = [r20] // gtod_lock.sequence 315 shr.u r2 = r2,r23 // shift by factor 316 ;; 317 add r8 = r8,r2 // Add xtime.nsecs 318 cmp4.ne p7,p0 = r28,r10 319(p7) br.cond.dpnt.few .time_redo // sequence number changed, redo 320 // End critical section. 321 // Now r8=tv->tv_nsec and r9=tv->tv_sec 322 mov r10 = r0 323 movl r2 = 1000000000 324 add r23 = IA64_TIMESPEC_TV_NSEC_OFFSET, r31 325(p14) movl r3 = 2361183241434822607 // Prep for / 1000 hack 326 ;; 327.time_normalize: 328 mov r21 = r8 329 cmp.ge p6,p0 = r8,r2 330(p14) shr.u r20 = r8, 3 // We can repeat this if necessary just wasting time 331 ;; 332(p14) setf.sig f8 = r20 333(p6) sub r8 = r8,r2 334(p6) add r9 = 1,r9 // two nops before the branch. 335(p14) setf.sig f7 = r3 // Chances for repeats are 1 in 10000 for gettod 336(p6) br.cond.dpnt.few .time_normalize 337 ;; 338 // Divided by 8 though shift. Now divide by 125 339 // The compiler was able to do that with a multiply 340 // and a shift and we do the same 341EX(.fail_efault, probe.w.fault r23, 3) // This also costs 5 cycles 342(p14) xmpy.hu f8 = f8, f7 // xmpy has 5 cycles latency so use it 343 ;; 344(p14) getf.sig r2 = f8 345 ;; 346 mov r8 = r0 347(p14) shr.u r21 = r2, 4 348 ;; 349EX(.fail_efault, st8 [r31] = r9) 350EX(.fail_efault, st8 [r23] = r21) 351 FSYS_RETURN 352.fail_einval: 353 mov r8 = EINVAL 354 mov r10 = -1 355 FSYS_RETURN 356.fail_efault: 357 mov r8 = EFAULT 358 mov r10 = -1 359 FSYS_RETURN 360END(fsys_gettimeofday) 361 362ENTRY(fsys_clock_gettime) 363 .prologue 364 .altrp b6 365 .body 366 cmp4.ltu p6, p0 = CLOCK_MONOTONIC, r32 367 // Fallback if this is not CLOCK_REALTIME or CLOCK_MONOTONIC 368(p6) br.spnt.few fsys_fallback_syscall 369 mov r31 = r33 370 shl r30 = r32,15 371 br.many .gettime 372END(fsys_clock_gettime) 373 374/* 375 * long fsys_rt_sigprocmask (int how, sigset_t *set, sigset_t *oset, size_t sigsetsize). 376 */ 377#if _NSIG_WORDS != 1 378# error Sorry, fsys_rt_sigprocmask() needs to be updated for _NSIG_WORDS != 1. 379#endif 380ENTRY(fsys_rt_sigprocmask) 381 .prologue 382 .altrp b6 383 .body 384 385 add r2=IA64_TASK_BLOCKED_OFFSET,r16 386 add r9=TI_FLAGS+IA64_TASK_SIZE,r16 387 cmp4.ltu p6,p0=SIG_SETMASK,r32 388 389 cmp.ne p15,p0=r0,r34 // oset != NULL? 390 tnat.nz p8,p0=r34 391 add r31=IA64_TASK_SIGHAND_OFFSET,r16 392 ;; 393 ld8 r3=[r2] // read/prefetch current->blocked 394 ld4 r9=[r9] 395 tnat.nz.or p6,p0=r35 396 397 cmp.ne.or p6,p0=_NSIG_WORDS*8,r35 398 tnat.nz.or p6,p0=r32 399(p6) br.spnt.few .fail_einval // fail with EINVAL 400 ;; 401#ifdef CONFIG_SMP 402 ld8 r31=[r31] // r31 <- current->sighand 403#endif 404 and r9=TIF_ALLWORK_MASK,r9 405 tnat.nz.or p8,p0=r33 406 ;; 407 cmp.ne p7,p0=0,r9 408 cmp.eq p6,p0=r0,r33 // set == NULL? 409 add r31=IA64_SIGHAND_SIGLOCK_OFFSET,r31 // r31 <- current->sighand->siglock 410(p8) br.spnt.few .fail_efault // fail with EFAULT 411(p7) br.spnt.many fsys_fallback_syscall // got pending kernel work... 412(p6) br.dpnt.many .store_mask // -> short-circuit to just reading the signal mask 413 414 /* Argh, we actually have to do some work and _update_ the signal mask: */ 415 416EX(.fail_efault, probe.r.fault r33, 3) // verify user has read-access to *set 417EX(.fail_efault, ld8 r14=[r33]) // r14 <- *set 418 mov r17=(1 << (SIGKILL - 1)) | (1 << (SIGSTOP - 1)) 419 ;; 420 421 RSM_PSR_I(p0, r18, r19) // mask interrupt delivery 422 andcm r14=r14,r17 // filter out SIGKILL & SIGSTOP 423 mov r8=EINVAL // default to EINVAL 424 425#ifdef CONFIG_SMP 426 // __ticket_spin_trylock(r31) 427 ld4 r17=[r31] 428 ;; 429 mov.m ar.ccv=r17 430 extr.u r9=r17,17,15 431 adds r19=1,r17 432 extr.u r18=r17,0,15 433 ;; 434 cmp.eq p6,p7=r9,r18 435 ;; 436(p6) cmpxchg4.acq r9=[r31],r19,ar.ccv 437(p6) dep.z r20=r19,1,15 // next serving ticket for unlock 438(p7) br.cond.spnt.many .lock_contention 439 ;; 440 cmp4.eq p0,p7=r9,r17 441 adds r31=2,r31 442(p7) br.cond.spnt.many .lock_contention 443 ld8 r3=[r2] // re-read current->blocked now that we hold the lock 444 ;; 445#else 446 ld8 r3=[r2] // re-read current->blocked now that we hold the lock 447#endif 448 add r18=IA64_TASK_PENDING_OFFSET+IA64_SIGPENDING_SIGNAL_OFFSET,r16 449 add r19=IA64_TASK_SIGNAL_OFFSET,r16 450 cmp4.eq p6,p0=SIG_BLOCK,r32 451 ;; 452 ld8 r19=[r19] // r19 <- current->signal 453 cmp4.eq p7,p0=SIG_UNBLOCK,r32 454 cmp4.eq p8,p0=SIG_SETMASK,r32 455 ;; 456 ld8 r18=[r18] // r18 <- current->pending.signal 457 .pred.rel.mutex p6,p7,p8 458(p6) or r14=r3,r14 // SIG_BLOCK 459(p7) andcm r14=r3,r14 // SIG_UNBLOCK 460 461(p8) mov r14=r14 // SIG_SETMASK 462(p6) mov r8=0 // clear error code 463 // recalc_sigpending() 464 add r17=IA64_SIGNAL_GROUP_STOP_COUNT_OFFSET,r19 465 466 add r19=IA64_SIGNAL_SHARED_PENDING_OFFSET+IA64_SIGPENDING_SIGNAL_OFFSET,r19 467 ;; 468 ld4 r17=[r17] // r17 <- current->signal->group_stop_count 469(p7) mov r8=0 // clear error code 470 471 ld8 r19=[r19] // r19 <- current->signal->shared_pending 472 ;; 473 cmp4.gt p6,p7=r17,r0 // p6/p7 <- (current->signal->group_stop_count > 0)? 474(p8) mov r8=0 // clear error code 475 476 or r18=r18,r19 // r18 <- current->pending | current->signal->shared_pending 477 ;; 478 // r18 <- (current->pending | current->signal->shared_pending) & ~current->blocked: 479 andcm r18=r18,r14 480 add r9=TI_FLAGS+IA64_TASK_SIZE,r16 481 ;; 482 483(p7) cmp.ne.or.andcm p6,p7=r18,r0 // p6/p7 <- signal pending 484 mov r19=0 // i must not leak kernel bits... 485(p6) br.cond.dpnt.many .sig_pending 486 ;; 487 4881: ld4 r17=[r9] // r17 <- current->thread_info->flags 489 ;; 490 mov ar.ccv=r17 491 and r18=~_TIF_SIGPENDING,r17 // r18 <- r17 & ~(1 << TIF_SIGPENDING) 492 ;; 493 494 st8 [r2]=r14 // update current->blocked with new mask 495 cmpxchg4.acq r8=[r9],r18,ar.ccv // current->thread_info->flags <- r18 496 ;; 497 cmp.ne p6,p0=r17,r8 // update failed? 498(p6) br.cond.spnt.few 1b // yes -> retry 499 500#ifdef CONFIG_SMP 501 // __ticket_spin_unlock(r31) 502 st2.rel [r31]=r20 503 mov r20=0 // i must not leak kernel bits... 504#endif 505 SSM_PSR_I(p0, p9, r31) 506 ;; 507 508 srlz.d // ensure psr.i is set again 509 mov r18=0 // i must not leak kernel bits... 510 511.store_mask: 512EX(.fail_efault, (p15) probe.w.fault r34, 3) // verify user has write-access to *oset 513EX(.fail_efault, (p15) st8 [r34]=r3) 514 mov r2=0 // i must not leak kernel bits... 515 mov r3=0 // i must not leak kernel bits... 516 mov r8=0 // return 0 517 mov r9=0 // i must not leak kernel bits... 518 mov r14=0 // i must not leak kernel bits... 519 mov r17=0 // i must not leak kernel bits... 520 mov r31=0 // i must not leak kernel bits... 521 FSYS_RETURN 522 523.sig_pending: 524#ifdef CONFIG_SMP 525 // __ticket_spin_unlock(r31) 526 st2.rel [r31]=r20 // release the lock 527#endif 528 SSM_PSR_I(p0, p9, r17) 529 ;; 530 srlz.d 531 br.sptk.many fsys_fallback_syscall // with signal pending, do the heavy-weight syscall 532 533#ifdef CONFIG_SMP 534.lock_contention: 535 /* Rather than spinning here, fall back on doing a heavy-weight syscall. */ 536 SSM_PSR_I(p0, p9, r17) 537 ;; 538 srlz.d 539 br.sptk.many fsys_fallback_syscall 540#endif 541END(fsys_rt_sigprocmask) 542 543/* 544 * fsys_getcpu doesn't use the third parameter in this implementation. It reads 545 * current_thread_info()->cpu and corresponding node in cpu_to_node_map. 546 */ 547ENTRY(fsys_getcpu) 548 .prologue 549 .altrp b6 550 .body 551 ;; 552 add r2=TI_FLAGS+IA64_TASK_SIZE,r16 553 tnat.nz p6,p0 = r32 // guard against NaT argument 554 add r3=TI_CPU+IA64_TASK_SIZE,r16 555 ;; 556 ld4 r3=[r3] // M r3 = thread_info->cpu 557 ld4 r2=[r2] // M r2 = thread_info->flags 558(p6) br.cond.spnt.few .fail_einval // B 559 ;; 560 tnat.nz p7,p0 = r33 // I guard against NaT argument 561(p7) br.cond.spnt.few .fail_einval // B 562#ifdef CONFIG_NUMA 563 movl r17=cpu_to_node_map 564 ;; 565EX(.fail_efault, probe.w.fault r32, 3) // M This takes 5 cycles 566EX(.fail_efault, probe.w.fault r33, 3) // M This takes 5 cycles 567 shladd r18=r3,1,r17 568 ;; 569 ld2 r20=[r18] // r20 = cpu_to_node_map[cpu] 570 and r2 = TIF_ALLWORK_MASK,r2 571 ;; 572 cmp.ne p8,p0=0,r2 573(p8) br.spnt.many fsys_fallback_syscall 574 ;; 575 ;; 576EX(.fail_efault, st4 [r32] = r3) 577EX(.fail_efault, st2 [r33] = r20) 578 mov r8=0 579 ;; 580#else 581EX(.fail_efault, probe.w.fault r32, 3) // M This takes 5 cycles 582EX(.fail_efault, probe.w.fault r33, 3) // M This takes 5 cycles 583 and r2 = TIF_ALLWORK_MASK,r2 584 ;; 585 cmp.ne p8,p0=0,r2 586(p8) br.spnt.many fsys_fallback_syscall 587 ;; 588EX(.fail_efault, st4 [r32] = r3) 589EX(.fail_efault, st2 [r33] = r0) 590 mov r8=0 591 ;; 592#endif 593 FSYS_RETURN 594END(fsys_getcpu) 595 596ENTRY(fsys_fallback_syscall) 597 .prologue 598 .altrp b6 599 .body 600 /* 601 * We only get here from light-weight syscall handlers. Thus, we already 602 * know that r15 contains a valid syscall number. No need to re-check. 603 */ 604 adds r17=-1024,r15 605 movl r14=sys_call_table 606 ;; 607 RSM_PSR_I(p0, r26, r27) 608 shladd r18=r17,3,r14 609 ;; 610 ld8 r18=[r18] // load normal (heavy-weight) syscall entry-point 611 MOV_FROM_PSR(p0, r29, r26) // read psr (12 cyc load latency) 612 mov r27=ar.rsc 613 mov r21=ar.fpsr 614 mov r26=ar.pfs 615END(fsys_fallback_syscall) 616 /* FALL THROUGH */ 617GLOBAL_ENTRY(paravirt_fsys_bubble_down) 618 .prologue 619 .altrp b6 620 .body 621 /* 622 * We get here for syscalls that don't have a lightweight 623 * handler. For those, we need to bubble down into the kernel 624 * and that requires setting up a minimal pt_regs structure, 625 * and initializing the CPU state more or less as if an 626 * interruption had occurred. To make syscall-restarts work, 627 * we setup pt_regs such that cr_iip points to the second 628 * instruction in syscall_via_break. Decrementing the IP 629 * hence will restart the syscall via break and not 630 * decrementing IP will return us to the caller, as usual. 631 * Note that we preserve the value of psr.pp rather than 632 * initializing it from dcr.pp. This makes it possible to 633 * distinguish fsyscall execution from other privileged 634 * execution. 635 * 636 * On entry: 637 * - normal fsyscall handler register usage, except 638 * that we also have: 639 * - r18: address of syscall entry point 640 * - r21: ar.fpsr 641 * - r26: ar.pfs 642 * - r27: ar.rsc 643 * - r29: psr 644 * 645 * We used to clear some PSR bits here but that requires slow 646 * serialization. Fortuntely, that isn't really necessary. 647 * The rationale is as follows: we used to clear bits 648 * ~PSR_PRESERVED_BITS in PSR.L. Since 649 * PSR_PRESERVED_BITS==PSR.{UP,MFL,MFH,PK,DT,PP,SP,RT,IC}, we 650 * ended up clearing PSR.{BE,AC,I,DFL,DFH,DI,DB,SI,TB}. 651 * However, 652 * 653 * PSR.BE : already is turned off in __kernel_syscall_via_epc() 654 * PSR.AC : don't care (kernel normally turns PSR.AC on) 655 * PSR.I : already turned off by the time paravirt_fsys_bubble_down gets 656 * invoked 657 * PSR.DFL: always 0 (kernel never turns it on) 658 * PSR.DFH: don't care --- kernel never touches f32-f127 on its own 659 * initiative 660 * PSR.DI : always 0 (kernel never turns it on) 661 * PSR.SI : always 0 (kernel never turns it on) 662 * PSR.DB : don't care --- kernel never enables kernel-level 663 * breakpoints 664 * PSR.TB : must be 0 already; if it wasn't zero on entry to 665 * __kernel_syscall_via_epc, the branch to paravirt_fsys_bubble_down 666 * will trigger a taken branch; the taken-trap-handler then 667 * converts the syscall into a break-based system-call. 668 */ 669 /* 670 * Reading psr.l gives us only bits 0-31, psr.it, and psr.mc. 671 * The rest we have to synthesize. 672 */ 673# define PSR_ONE_BITS ((3 << IA64_PSR_CPL0_BIT) \ 674 | (0x1 << IA64_PSR_RI_BIT) \ 675 | IA64_PSR_BN | IA64_PSR_I) 676 677 invala // M0|1 678 movl r14=ia64_ret_from_syscall // X 679 680 nop.m 0 681 movl r28=__kernel_syscall_via_break // X create cr.iip 682 ;; 683 684 mov r2=r16 // A get task addr to addl-addressable register 685 adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16 // A 686 mov r31=pr // I0 save pr (2 cyc) 687 ;; 688 st1 [r16]=r0 // M2|3 clear current->thread.on_ustack flag 689 addl r22=IA64_RBS_OFFSET,r2 // A compute base of RBS 690 add r3=TI_FLAGS+IA64_TASK_SIZE,r2 // A 691 ;; 692 ld4 r3=[r3] // M0|1 r3 = current_thread_info()->flags 693 lfetch.fault.excl.nt1 [r22] // M0|1 prefetch register backing-store 694 nop.i 0 695 ;; 696 mov ar.rsc=0 // M2 set enforced lazy mode, pl 0, LE, loadrs=0 697#ifdef CONFIG_VIRT_CPU_ACCOUNTING 698 MOV_FROM_ITC(p0, p6, r30, r23) // M get cycle for accounting 699#else 700 nop.m 0 701#endif 702 nop.i 0 703 ;; 704 mov r23=ar.bspstore // M2 (12 cyc) save ar.bspstore 705 mov.m r24=ar.rnat // M2 (5 cyc) read ar.rnat (dual-issues!) 706 nop.i 0 707 ;; 708 mov ar.bspstore=r22 // M2 (6 cyc) switch to kernel RBS 709 movl r8=PSR_ONE_BITS // X 710 ;; 711 mov r25=ar.unat // M2 (5 cyc) save ar.unat 712 mov r19=b6 // I0 save b6 (2 cyc) 713 mov r20=r1 // A save caller's gp in r20 714 ;; 715 or r29=r8,r29 // A construct cr.ipsr value to save 716 mov b6=r18 // I0 copy syscall entry-point to b6 (7 cyc) 717 addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r2 // A compute base of memory stack 718 719 mov r18=ar.bsp // M2 save (kernel) ar.bsp (12 cyc) 720 cmp.ne pKStk,pUStk=r0,r0 // A set pKStk <- 0, pUStk <- 1 721 br.call.sptk.many b7=ia64_syscall_setup // B 722 ;; 723#ifdef CONFIG_VIRT_CPU_ACCOUNTING 724 // mov.m r30=ar.itc is called in advance 725 add r16=TI_AC_STAMP+IA64_TASK_SIZE,r2 726 add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r2 727 ;; 728 ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP // time at last check in kernel 729 ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE // time at leave kernel 730 ;; 731 ld8 r20=[r16],TI_AC_STAMP-TI_AC_STIME // cumulated stime 732 ld8 r21=[r17] // cumulated utime 733 sub r22=r19,r18 // stime before leave kernel 734 ;; 735 st8 [r16]=r30,TI_AC_STIME-TI_AC_STAMP // update stamp 736 sub r18=r30,r19 // elapsed time in user mode 737 ;; 738 add r20=r20,r22 // sum stime 739 add r21=r21,r18 // sum utime 740 ;; 741 st8 [r16]=r20 // update stime 742 st8 [r17]=r21 // update utime 743 ;; 744#endif 745 mov ar.rsc=0x3 // M2 set eager mode, pl 0, LE, loadrs=0 746 mov rp=r14 // I0 set the real return addr 747 and r3=_TIF_SYSCALL_TRACEAUDIT,r3 // A 748 ;; 749 SSM_PSR_I(p0, p6, r22) // M2 we're on kernel stacks now, reenable irqs 750 cmp.eq p8,p0=r3,r0 // A 751(p10) br.cond.spnt.many ia64_ret_from_syscall // B return if bad call-frame or r15 is a NaT 752 753 nop.m 0 754(p8) br.call.sptk.many b6=b6 // B (ignore return address) 755 br.cond.spnt ia64_trace_syscall // B 756END(paravirt_fsys_bubble_down) 757 758 .rodata 759 .align 8 760 .globl paravirt_fsyscall_table 761 762 data8 paravirt_fsys_bubble_down 763paravirt_fsyscall_table: 764 data8 fsys_ni_syscall 765 data8 0 // exit // 1025 766 data8 0 // read 767 data8 0 // write 768 data8 0 // open 769 data8 0 // close 770 data8 0 // creat // 1030 771 data8 0 // link 772 data8 0 // unlink 773 data8 0 // execve 774 data8 0 // chdir 775 data8 0 // fchdir // 1035 776 data8 0 // utimes 777 data8 0 // mknod 778 data8 0 // chmod 779 data8 0 // chown 780 data8 0 // lseek // 1040 781 data8 fsys_getpid // getpid 782 data8 fsys_getppid // getppid 783 data8 0 // mount 784 data8 0 // umount 785 data8 0 // setuid // 1045 786 data8 0 // getuid 787 data8 0 // geteuid 788 data8 0 // ptrace 789 data8 0 // access 790 data8 0 // sync // 1050 791 data8 0 // fsync 792 data8 0 // fdatasync 793 data8 0 // kill 794 data8 0 // rename 795 data8 0 // mkdir // 1055 796 data8 0 // rmdir 797 data8 0 // dup 798 data8 0 // pipe 799 data8 0 // times 800 data8 0 // brk // 1060 801 data8 0 // setgid 802 data8 0 // getgid 803 data8 0 // getegid 804 data8 0 // acct 805 data8 0 // ioctl // 1065 806 data8 0 // fcntl 807 data8 0 // umask 808 data8 0 // chroot 809 data8 0 // ustat 810 data8 0 // dup2 // 1070 811 data8 0 // setreuid 812 data8 0 // setregid 813 data8 0 // getresuid 814 data8 0 // setresuid 815 data8 0 // getresgid // 1075 816 data8 0 // setresgid 817 data8 0 // getgroups 818 data8 0 // setgroups 819 data8 0 // getpgid 820 data8 0 // setpgid // 1080 821 data8 0 // setsid 822 data8 0 // getsid 823 data8 0 // sethostname 824 data8 0 // setrlimit 825 data8 0 // getrlimit // 1085 826 data8 0 // getrusage 827 data8 fsys_gettimeofday // gettimeofday 828 data8 0 // settimeofday 829 data8 0 // select 830 data8 0 // poll // 1090 831 data8 0 // symlink 832 data8 0 // readlink 833 data8 0 // uselib 834 data8 0 // swapon 835 data8 0 // swapoff // 1095 836 data8 0 // reboot 837 data8 0 // truncate 838 data8 0 // ftruncate 839 data8 0 // fchmod 840 data8 0 // fchown // 1100 841 data8 0 // getpriority 842 data8 0 // setpriority 843 data8 0 // statfs 844 data8 0 // fstatfs 845 data8 0 // gettid // 1105 846 data8 0 // semget 847 data8 0 // semop 848 data8 0 // semctl 849 data8 0 // msgget 850 data8 0 // msgsnd // 1110 851 data8 0 // msgrcv 852 data8 0 // msgctl 853 data8 0 // shmget 854 data8 0 // shmat 855 data8 0 // shmdt // 1115 856 data8 0 // shmctl 857 data8 0 // syslog 858 data8 0 // setitimer 859 data8 0 // getitimer 860 data8 0 // 1120 861 data8 0 862 data8 0 863 data8 0 // vhangup 864 data8 0 // lchown 865 data8 0 // remap_file_pages // 1125 866 data8 0 // wait4 867 data8 0 // sysinfo 868 data8 0 // clone 869 data8 0 // setdomainname 870 data8 0 // newuname // 1130 871 data8 0 // adjtimex 872 data8 0 873 data8 0 // init_module 874 data8 0 // delete_module 875 data8 0 // 1135 876 data8 0 877 data8 0 // quotactl 878 data8 0 // bdflush 879 data8 0 // sysfs 880 data8 0 // personality // 1140 881 data8 0 // afs_syscall 882 data8 0 // setfsuid 883 data8 0 // setfsgid 884 data8 0 // getdents 885 data8 0 // flock // 1145 886 data8 0 // readv 887 data8 0 // writev 888 data8 0 // pread64 889 data8 0 // pwrite64 890 data8 0 // sysctl // 1150 891 data8 0 // mmap 892 data8 0 // munmap 893 data8 0 // mlock 894 data8 0 // mlockall 895 data8 0 // mprotect // 1155 896 data8 0 // mremap 897 data8 0 // msync 898 data8 0 // munlock 899 data8 0 // munlockall 900 data8 0 // sched_getparam // 1160 901 data8 0 // sched_setparam 902 data8 0 // sched_getscheduler 903 data8 0 // sched_setscheduler 904 data8 0 // sched_yield 905 data8 0 // sched_get_priority_max // 1165 906 data8 0 // sched_get_priority_min 907 data8 0 // sched_rr_get_interval 908 data8 0 // nanosleep 909 data8 0 // nfsservctl 910 data8 0 // prctl // 1170 911 data8 0 // getpagesize 912 data8 0 // mmap2 913 data8 0 // pciconfig_read 914 data8 0 // pciconfig_write 915 data8 0 // perfmonctl // 1175 916 data8 0 // sigaltstack 917 data8 0 // rt_sigaction 918 data8 0 // rt_sigpending 919 data8 fsys_rt_sigprocmask // rt_sigprocmask 920 data8 0 // rt_sigqueueinfo // 1180 921 data8 0 // rt_sigreturn 922 data8 0 // rt_sigsuspend 923 data8 0 // rt_sigtimedwait 924 data8 0 // getcwd 925 data8 0 // capget // 1185 926 data8 0 // capset 927 data8 0 // sendfile 928 data8 0 929 data8 0 930 data8 0 // socket // 1190 931 data8 0 // bind 932 data8 0 // connect 933 data8 0 // listen 934 data8 0 // accept 935 data8 0 // getsockname // 1195 936 data8 0 // getpeername 937 data8 0 // socketpair 938 data8 0 // send 939 data8 0 // sendto 940 data8 0 // recv // 1200 941 data8 0 // recvfrom 942 data8 0 // shutdown 943 data8 0 // setsockopt 944 data8 0 // getsockopt 945 data8 0 // sendmsg // 1205 946 data8 0 // recvmsg 947 data8 0 // pivot_root 948 data8 0 // mincore 949 data8 0 // madvise 950 data8 0 // newstat // 1210 951 data8 0 // newlstat 952 data8 0 // newfstat 953 data8 0 // clone2 954 data8 0 // getdents64 955 data8 0 // getunwind // 1215 956 data8 0 // readahead 957 data8 0 // setxattr 958 data8 0 // lsetxattr 959 data8 0 // fsetxattr 960 data8 0 // getxattr // 1220 961 data8 0 // lgetxattr 962 data8 0 // fgetxattr 963 data8 0 // listxattr 964 data8 0 // llistxattr 965 data8 0 // flistxattr // 1225 966 data8 0 // removexattr 967 data8 0 // lremovexattr 968 data8 0 // fremovexattr 969 data8 0 // tkill 970 data8 0 // futex // 1230 971 data8 0 // sched_setaffinity 972 data8 0 // sched_getaffinity 973 data8 fsys_set_tid_address // set_tid_address 974 data8 0 // fadvise64_64 975 data8 0 // tgkill // 1235 976 data8 0 // exit_group 977 data8 0 // lookup_dcookie 978 data8 0 // io_setup 979 data8 0 // io_destroy 980 data8 0 // io_getevents // 1240 981 data8 0 // io_submit 982 data8 0 // io_cancel 983 data8 0 // epoll_create 984 data8 0 // epoll_ctl 985 data8 0 // epoll_wait // 1245 986 data8 0 // restart_syscall 987 data8 0 // semtimedop 988 data8 0 // timer_create 989 data8 0 // timer_settime 990 data8 0 // timer_gettime // 1250 991 data8 0 // timer_getoverrun 992 data8 0 // timer_delete 993 data8 0 // clock_settime 994 data8 fsys_clock_gettime // clock_gettime 995 data8 0 // clock_getres // 1255 996 data8 0 // clock_nanosleep 997 data8 0 // fstatfs64 998 data8 0 // statfs64 999 data8 0 // mbind 1000 data8 0 // get_mempolicy // 1260 1001 data8 0 // set_mempolicy 1002 data8 0 // mq_open 1003 data8 0 // mq_unlink 1004 data8 0 // mq_timedsend 1005 data8 0 // mq_timedreceive // 1265 1006 data8 0 // mq_notify 1007 data8 0 // mq_getsetattr 1008 data8 0 // kexec_load 1009 data8 0 // vserver 1010 data8 0 // waitid // 1270 1011 data8 0 // add_key 1012 data8 0 // request_key 1013 data8 0 // keyctl 1014 data8 0 // ioprio_set 1015 data8 0 // ioprio_get // 1275 1016 data8 0 // move_pages 1017 data8 0 // inotify_init 1018 data8 0 // inotify_add_watch 1019 data8 0 // inotify_rm_watch 1020 data8 0 // migrate_pages // 1280 1021 data8 0 // openat 1022 data8 0 // mkdirat 1023 data8 0 // mknodat 1024 data8 0 // fchownat 1025 data8 0 // futimesat // 1285 1026 data8 0 // newfstatat 1027 data8 0 // unlinkat 1028 data8 0 // renameat 1029 data8 0 // linkat 1030 data8 0 // symlinkat // 1290 1031 data8 0 // readlinkat 1032 data8 0 // fchmodat 1033 data8 0 // faccessat 1034 data8 0 1035 data8 0 // 1295 1036 data8 0 // unshare 1037 data8 0 // splice 1038 data8 0 // set_robust_list 1039 data8 0 // get_robust_list 1040 data8 0 // sync_file_range // 1300 1041 data8 0 // tee 1042 data8 0 // vmsplice 1043 data8 0 1044 data8 fsys_getcpu // getcpu // 1304 1045 1046 // fill in zeros for the remaining entries 1047 .zero: 1048 .space paravirt_fsyscall_table + 8*NR_syscalls - .zero, 0 1049