arch/blackfin/mach-common/entry.S

   1 /*
   2  * Contains the system-call and fault low-level handling routines.
   3  * This also contains the timer-interrupt handler, as well as all
   4  * interrupts and faults that can result in a task-switch.
   5  *
   6  * Copyright 2005-2009 Analog Devices Inc.
   7  *
   8  * Licensed under the GPL-2 or later.
   9  */
  10
  11 /* NOTE: This code handles signal-recognition, which happens every time
  12  * after a timer-interrupt and after each system call.
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/linkage.h>
  17 #include <linux/unistd.h>
  18 #include <asm/blackfin.h>
  19 #include <asm/errno.h>
  20 #include <asm/fixed_code.h>
  21 #include <asm/thread_info.h>  /* TIF_NEED_RESCHED */
  22 #include <asm/asm-offsets.h>
  23 #include <asm/trace.h>
  24 #include <asm/traps.h>
  25
  26 #include <asm/context.S>
  27
  28
  29 #ifdef CONFIG_EXCPT_IRQ_SYSC_L1
  30 .section .l1.text
  31 #else
  32 .text
  33 #endif
  34
  35 /* Slightly simplified and streamlined entry point for CPLB misses.
  36  * This one does not lower the level to IRQ5, and thus can be used to
  37  * patch up CPLB misses on the kernel stack.
  38  */
  39 #if ANOMALY_05000261
  40 #define _ex_dviol _ex_workaround_261
  41 #define _ex_dmiss _ex_workaround_261
  42 #define _ex_dmult _ex_workaround_261
  43
  44 ENTRY(_ex_workaround_261)
  45         /*
  46          * Work around an anomaly: if we see a new DCPLB fault, return
  47          * without doing anything.  Then, if we get the same fault again,
  48          * handle it.
  49          */
  50         P4 = R7;        /* Store EXCAUSE */
  51
  52         GET_PDA(p5, r7);
  53         r7 = [p5 + PDA_LFRETX];
  54         r6 = retx;
  55         [p5 + PDA_LFRETX] = r6;
  56         cc = r6 == r7;
  57         if !cc jump _bfin_return_from_exception;
  58         /* fall through */
  59         R7 = P4;
  60         R6 = VEC_CPLB_M;        /* Data CPLB Miss */
  61         cc = R6 == R7;
  62         if cc jump _ex_dcplb_miss (BP);
  63 #ifdef CONFIG_MPU
  64         R6 = VEC_CPLB_VL;       /* Data CPLB Violation */
  65         cc = R6 == R7;
  66         if cc jump _ex_dcplb_viol (BP);
  67 #endif
  68         /* Handle Data CPLB Protection Violation
  69          * and Data CPLB Multiple Hits - Linux Trap Zero
  70          */
  71         jump _ex_trap_c;
  72 ENDPROC(_ex_workaround_261)
  73
  74 #else
  75 #ifdef CONFIG_MPU
  76 #define _ex_dviol _ex_dcplb_viol
  77 #else
  78 #define _ex_dviol _ex_trap_c
  79 #endif
  80 #define _ex_dmiss _ex_dcplb_miss
  81 #define _ex_dmult _ex_trap_c
  82 #endif
  83
  84
  85 ENTRY(_ex_dcplb_viol)
  86 ENTRY(_ex_dcplb_miss)
  87 ENTRY(_ex_icplb_miss)
  88         (R7:6,P5:4) = [sp++];
  89         /* We leave the previously pushed ASTAT on the stack.  */
  90         SAVE_CONTEXT_CPLB
  91
  92         /* We must load R1 here, _before_ DEBUG_HWTRACE_SAVE, since that
  93          * will change the stack pointer.  */
  94         R0 = SEQSTAT;
  95         R1 = SP;
  96
  97         DEBUG_HWTRACE_SAVE(p5, r7)
  98
  99         sp += -12;
 100         call _cplb_hdr;
 101         sp += 12;
 102         CC = R0 == 0;
 103         IF !CC JUMP _handle_bad_cplb;
 104
 105 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 106         /* While we were processing this, did we double fault? */
 107         r7 = SEQSTAT;           /* reason code is in bit 5:0 */
 108         r6.l = lo(SEQSTAT_EXCAUSE);
 109         r6.h = hi(SEQSTAT_EXCAUSE);
 110         r7 = r7 & r6;
 111         r6 = 0x25;
 112         CC = R7 == R6;
 113         if CC JUMP _double_fault;
 114 #endif
 115
 116         DEBUG_HWTRACE_RESTORE(p5, r7)
 117         RESTORE_CONTEXT_CPLB
 118         ASTAT = [SP++];
 119         SP = EX_SCRATCH_REG;
 120         rtx;
 121 ENDPROC(_ex_icplb_miss)
 122
 123 ENTRY(_ex_syscall)
 124         raise 15;               /* invoked by TRAP #0, for sys call */
 125         jump.s _bfin_return_from_exception;
 126 ENDPROC(_ex_syscall)
 127
 128 ENTRY(_ex_single_step)
 129         /* If we just returned from an interrupt, the single step event is
 130            for the RTI instruction.  */
 131         r7 = retx;
 132         r6 = reti;
 133         cc = r7 == r6;
 134         if cc jump _bfin_return_from_exception;
 135
 136 #ifdef CONFIG_KGDB
 137         /* Don't do single step in hardware exception handler */
 138         p5.l = lo(IPEND);
 139         p5.h = hi(IPEND);
 140         r6 = [p5];
 141         cc = bittst(r6, 4);
 142         if cc jump _bfin_return_from_exception;
 143         cc = bittst(r6, 5);
 144         if cc jump _bfin_return_from_exception;
 145
 146         /* skip single step if current interrupt priority is higher than
 147          * that of the first instruction, from which gdb starts single step */
 148         r6 >>= 6;
 149         r7 = 10;
 150 .Lfind_priority_start:
 151         cc = bittst(r6, 0);
 152         if cc jump .Lfind_priority_done;
 153         r6 >>= 1;
 154         r7 += -1;
 155         cc = r7 == 0;
 156         if cc jump .Lfind_priority_done;
 157         jump.s .Lfind_priority_start;
 158 .Lfind_priority_done:
 159         p4.l = _kgdb_single_step;
 160         p4.h = _kgdb_single_step;
 161         r6 = [p4];
 162         cc = r6 == 0;
 163         if cc jump .Ldo_single_step;
 164         r6 += -1;
 165         cc = r6 < r7;
 166         if cc jump 1f;
 167 .Ldo_single_step:
 168 #else
 169         /* If we were in user mode, do the single step normally.  */
 170         p5.l = lo(IPEND);
 171         p5.h = hi(IPEND);
 172         r6 = [p5];
 173         r7 = 0xffe0 (z);
 174         r7 = r7 & r6;
 175         cc = r7 == 0;
 176         if !cc jump 1f;
 177 #endif
 178 #ifdef CONFIG_EXACT_HWERR
 179         /* Read the ILAT, and to check to see if the process we are
 180          * single stepping caused a previous hardware error
 181          * If so, do not single step, (which lowers to IRQ5, and makes
 182          * us miss the error).
 183          */
 184         p5.l = lo(ILAT);
 185         p5.h = hi(ILAT);
 186         r7 = [p5];
 187         cc = bittst(r7, EVT_IVHW_P);
 188         if cc jump 1f;
 189 #endif
 190         /* Single stepping only a single instruction, so clear the trace
 191          * bit here.  */
 192         r7 = syscfg;
 193         bitclr (r7, SYSCFG_SSSTEP_P);
 194         syscfg = R7;
 195         jump _ex_trap_c;
 196
 197 1:
 198         /*
 199          * We were in an interrupt handler.  By convention, all of them save
 200          * SYSCFG with their first instruction, so by checking whether our
 201          * RETX points at the entry point, we can determine whether to allow
 202          * a single step, or whether to clear SYSCFG.
 203          *
 204          * First, find out the interrupt level and the event vector for it.
 205          */
 206         p5.l = lo(EVT0);
 207         p5.h = hi(EVT0);
 208         p5 += -4;
 209 2:
 210         r7 = rot r7 by -1;
 211         p5 += 4;
 212         if !cc jump 2b;
 213
 214         /* What we actually do is test for the _second_ instruction in the
 215          * IRQ handler.  That way, if there are insns following the restore
 216          * of SYSCFG after leaving the handler, we will not turn off SYSCFG
 217          * for them.  */
 218
 219         r7 = [p5];
 220         r7 += 2;
 221         r6 = RETX;
 222         cc = R7 == R6;
 223         if !cc jump _bfin_return_from_exception;
 224
 225         r7 = syscfg;
 226         bitclr (r7, SYSCFG_SSSTEP_P);   /* Turn off single step */
 227         syscfg = R7;
 228
 229         /* Fall through to _bfin_return_from_exception.  */
 230 ENDPROC(_ex_single_step)
 231
 232 ENTRY(_bfin_return_from_exception)
 233 #if ANOMALY_05000257
 234         R7=LC0;
 235         LC0=R7;
 236         R7=LC1;
 237         LC1=R7;
 238 #endif
 239
 240 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 241         /* While we were processing the current exception,
 242          * did we cause another, and double fault?
 243          */
 244         r7 = SEQSTAT;           /* reason code is in bit 5:0 */
 245         r6.l = lo(SEQSTAT_EXCAUSE);
 246         r6.h = hi(SEQSTAT_EXCAUSE);
 247         r7 = r7 & r6;
 248         r6 = VEC_UNCOV;
 249         CC = R7 == R6;
 250         if CC JUMP _double_fault;
 251 #endif
 252
 253         (R7:6,P5:4) = [sp++];
 254         ASTAT = [sp++];
 255         sp = EX_SCRATCH_REG;
 256         rtx;
 257 ENDPROC(_bfin_return_from_exception)
 258
 259 ENTRY(_handle_bad_cplb)
 260         DEBUG_HWTRACE_RESTORE(p5, r7)
 261         /* To get here, we just tried and failed to change a CPLB
 262          * so, handle things in trap_c (C code), by lowering to
 263          * IRQ5, just like we normally do. Since this is not a
 264          * "normal" return path, we have a do a lot of stuff to
 265          * the stack to get ready so, we can fall through - we
 266          * need to make a CPLB exception look like a normal exception
 267          */
 268         RESTORE_CONTEXT_CPLB
 269         /* ASTAT is still on the stack, where it is needed.  */
 270         [--sp] = (R7:6,P5:4);
 271
 272 ENTRY(_ex_replaceable)
 273         nop;
 274
 275 ENTRY(_ex_trap_c)
 276         /* The only thing that has been saved in this context is
 277          * (R7:6,P5:4), ASTAT & SP - don't use anything else
 278          */
 279
 280         GET_PDA(p5, r6);
 281
 282         /* Make sure we are not in a double fault */
 283         p4.l = lo(IPEND);
 284         p4.h = hi(IPEND);
 285         r7 = [p4];
 286         CC = BITTST (r7, 5);
 287         if CC jump _double_fault;
 288         [p5 + PDA_EXIPEND] = r7;
 289
 290         /* Call C code (trap_c) to handle the exception, which most
 291          * likely involves sending a signal to the current process.
 292          * To avoid double faults, lower our priority to IRQ5 first.
 293          */
 294         r7.h = _exception_to_level5;
 295         r7.l = _exception_to_level5;
 296         p4.l = lo(EVT5);
 297         p4.h = hi(EVT5);
 298         [p4] = r7;
 299         csync;
 300
 301         /*
 302          * Save these registers, as they are only valid in exception context
 303          *  (where we are now - as soon as we defer to IRQ5, they can change)
 304          * DCPLB_STATUS and ICPLB_STATUS are also only valid in EVT3,
 305          * but they are not very interesting, so don't save them
 306          */
 307
 308         p4.l = lo(DCPLB_FAULT_ADDR);
 309         p4.h = hi(DCPLB_FAULT_ADDR);
 310         r7 = [p4];
 311         [p5 + PDA_DCPLB] = r7;
 312
 313         p4.l = lo(ICPLB_FAULT_ADDR);
 314         p4.h = hi(ICPLB_FAULT_ADDR);
 315         r6 = [p4];
 316         [p5 + PDA_ICPLB] = r6;
 317
 318         r6 = retx;
 319         [p5 + PDA_RETX] = r6;
 320
 321         r6 = SEQSTAT;
 322         [p5 + PDA_SEQSTAT] = r6;
 323
 324         /* Save the state of single stepping */
 325         r6 = SYSCFG;
 326         [p5 + PDA_SYSCFG] = r6;
 327         /* Clear it while we handle the exception in IRQ5 mode */
 328         BITCLR(r6, SYSCFG_SSSTEP_P);
 329         SYSCFG = r6;
 330
 331         /* Save the current IMASK, since we change in order to jump to level 5 */
 332         cli r6;
 333         [p5 + PDA_EXIMASK] = r6;
 334
 335         p4.l = lo(SAFE_USER_INSTRUCTION);
 336         p4.h = hi(SAFE_USER_INSTRUCTION);
 337         retx = p4;
 338
 339         /* Disable all interrupts, but make sure level 5 is enabled so
 340          * we can switch to that level.
 341          */
 342         r6 = 0x3f;
 343         sti r6;
 344
 345         /* In case interrupts are disabled IPEND[4] (global interrupt disable bit)
 346          * clear it (re-enabling interrupts again) by the special sequence of pushing
 347          * RETI onto the stack.  This way we can lower ourselves to IVG5 even if the
 348          * exception was taken after the interrupt handler was called but before it
 349          * got a chance to enable global interrupts itself.
 350          */
 351         [--sp] = reti;
 352         sp += 4;
 353
 354         raise 5;
 355         jump.s _bfin_return_from_exception;
 356 ENDPROC(_ex_trap_c)
 357
 358 /* We just realized we got an exception, while we were processing a different
 359  * exception. This is a unrecoverable event, so crash.
 360  * Note: this cannot be ENTRY() as we jump here with "if cc jump" ...
 361  */
 362 ENTRY(_double_fault)
 363         /* Turn caches & protection off, to ensure we don't get any more
 364          * double exceptions
 365          */
 366
 367         P4.L = LO(IMEM_CONTROL);
 368         P4.H = HI(IMEM_CONTROL);
 369
 370         R5 = [P4];              /* Control Register*/
 371         BITCLR(R5,ENICPLB_P);
 372         CSYNC;          /* Disabling of CPLBs should be proceeded by a CSYNC */
 373         [P4] = R5;
 374         SSYNC;
 375
 376         P4.L = LO(DMEM_CONTROL);
 377         P4.H = HI(DMEM_CONTROL);
 378         R5 = [P4];
 379         BITCLR(R5,ENDCPLB_P);
 380         CSYNC;          /* Disabling of CPLBs should be proceeded by a CSYNC */
 381         [P4] = R5;
 382         SSYNC;
 383
 384         /* Fix up the stack */
 385         (R7:6,P5:4) = [sp++];
 386         ASTAT = [sp++];
 387         SP = EX_SCRATCH_REG;
 388
 389         /* We should be out of the exception stack, and back down into
 390          * kernel or user space stack
 391          */
 392         SAVE_ALL_SYS
 393
 394         /* The dumping functions expect the return address in the RETI
 395          * slot.  */
 396         r6 = retx;
 397         [sp + PT_PC] = r6;
 398
 399         r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
 400         SP += -12;
 401         pseudo_long_call _double_fault_c, p5;
 402         SP += 12;
 403 .L_double_fault_panic:
 404         JUMP .L_double_fault_panic
 405
 406 ENDPROC(_double_fault)
 407
 408 ENTRY(_exception_to_level5)
 409         SAVE_ALL_SYS
 410
 411         GET_PDA(p5, r7);        /* Fetch current PDA */
 412         r6 = [p5 + PDA_RETX];
 413         [sp + PT_PC] = r6;
 414
 415         r6 = [p5 + PDA_SYSCFG];
 416         [sp + PT_SYSCFG] = r6;
 417
 418         r6 = [p5 + PDA_SEQSTAT]; /* Read back seqstat */
 419         [sp + PT_SEQSTAT] = r6;
 420
 421         /* Restore the hardware error vector.  */
 422         r7.h = _evt_ivhw;
 423         r7.l = _evt_ivhw;
 424         p4.l = lo(EVT5);
 425         p4.h = hi(EVT5);
 426         [p4] = r7;
 427         csync;
 428
 429 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 430         /* Now that we have the hardware error vector programmed properly
 431          * we can re-enable interrupts (IPEND[4]), so if the _trap_c causes
 432          * another hardware error, we can catch it (self-nesting).
 433          */
 434         [--sp] = reti;
 435         sp += 4;
 436 #endif
 437
 438         r7 = [p5 + PDA_EXIPEND] /* Read the IPEND from the Exception state */
 439         [sp + PT_IPEND] = r7;   /* Store IPEND onto the stack */
 440
 441         r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
 442         SP += -12;
 443         pseudo_long_call _trap_c, p4;
 444         SP += 12;
 445
 446         /* If interrupts were off during the exception (IPEND[4] = 1), turn them off
 447          * before we return.
 448          */
 449         CC = BITTST(r7, EVT_IRPTEN_P)
 450         if !CC jump 1f;
 451         /* this will load a random value into the reti register - but that is OK,
 452          * since we do restore it to the correct value in the 'RESTORE_ALL_SYS' macro
 453          */
 454         sp += -4;
 455         reti = [sp++];
 456 1:
 457         /* restore the interrupt mask (IMASK) */
 458         r6 = [p5 + PDA_EXIMASK];
 459         sti r6;
 460
 461         call _ret_from_exception;
 462         RESTORE_ALL_SYS
 463         rti;
 464 ENDPROC(_exception_to_level5)
 465
 466 ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
 467         /* Since the kernel stack can be anywhere, it's not guaranteed to be
 468          * covered by a CPLB.  Switch to an exception stack; use RETN as a
 469          * scratch register (for want of a better option).
 470          */
 471         EX_SCRATCH_REG = sp;
 472         GET_PDA_SAFE(sp);
 473         sp = [sp + PDA_EXSTACK];
 474         /* Try to deal with syscalls quickly.  */
 475         [--sp] = ASTAT;
 476         [--sp] = (R7:6,P5:4);
 477
 478         ANOMALY_283_315_WORKAROUND(p5, r7)
 479
 480 #ifdef CONFIG_EXACT_HWERR
 481         /* Make sure all pending read/writes complete. This will ensure any
 482          * accesses which could cause hardware errors completes, and signal
 483          * the the hardware before we do something silly, like crash the
 484          * kernel. We don't need to work around anomaly 05000312, since
 485          * we are already atomic
 486          */
 487         ssync;
 488 #endif
 489
 490 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 491         /*
 492          * Save these registers, as they are only valid in exception context
 493          * (where we are now - as soon as we defer to IRQ5, they can change)
 494          * DCPLB_STATUS and ICPLB_STATUS are also only valid in EVT3,
 495          * but they are not very interesting, so don't save them
 496          */
 497
 498         GET_PDA(p5, r7);
 499         p4.l = lo(DCPLB_FAULT_ADDR);
 500         p4.h = hi(DCPLB_FAULT_ADDR);
 501         r7 = [p4];
 502         [p5 + PDA_DF_DCPLB] = r7;
 503
 504         p4.l = lo(ICPLB_FAULT_ADDR);
 505         p4.h = hi(ICPLB_FAULT_ADDR);
 506         r7 = [p4];
 507         [p5 + PDA_DF_ICPLB] = r7;
 508
 509         r7 = retx;
 510         [p5 + PDA_DF_RETX] = r7;
 511
 512         r7 = SEQSTAT;           /* reason code is in bit 5:0 */
 513         [p5 + PDA_DF_SEQSTAT] = r7;
 514 #else
 515         r7 = SEQSTAT;           /* reason code is in bit 5:0 */
 516 #endif
 517         r6.l = lo(SEQSTAT_EXCAUSE);
 518         r6.h = hi(SEQSTAT_EXCAUSE);
 519         r7 = r7 & r6;
 520         p5.h = _ex_table;
 521         p5.l = _ex_table;
 522         p4 = r7;
 523         p5 = p5 + (p4 << 2);
 524         p4 = [p5];
 525         jump (p4);
 526
 527 .Lbadsys:
 528         r7 = -ENOSYS;           /* signextending enough */
 529         [sp + PT_R0] = r7;      /* return value from system call */
 530         jump .Lsyscall_really_exit;
 531 ENDPROC(_trap)
 532
 533 ENTRY(_system_call)
 534         /* Store IPEND */
 535         p2.l = lo(IPEND);
 536         p2.h = hi(IPEND);
 537         csync;
 538         r0 = [p2];
 539         [sp + PT_IPEND] = r0;
 540
 541         /* Store RETS for now */
 542         r0 = rets;
 543         [sp + PT_RESERVED] = r0;
 544         /* Set the stack for the current process */
 545         r7 = sp;
 546         r6.l = lo(ALIGN_PAGE_MASK);
 547         r6.h = hi(ALIGN_PAGE_MASK);
 548         r7 = r7 & r6;           /* thread_info */
 549         p2 = r7;
 550         p2 = [p2];
 551
 552         [p2+(TASK_THREAD+THREAD_KSP)] = sp;
 553 #ifdef CONFIG_IPIPE
 554         r0 = sp;
 555         SP += -12;
 556         pseudo_long_call ___ipipe_syscall_root, p0;
 557         SP += 12;
 558         cc = r0 == 1;
 559         if cc jump .Lsyscall_really_exit;
 560         cc = r0 == -1;
 561         if cc jump .Lresume_userspace;
 562         r3 = [sp + PT_R3];
 563         r4 = [sp + PT_R4];
 564         p0 = [sp + PT_ORIG_P0];
 565 #endif /* CONFIG_IPIPE */
 566
 567         /* are we tracing syscalls?*/
 568         r7 = sp;
 569         r6.l = lo(ALIGN_PAGE_MASK);
 570         r6.h = hi(ALIGN_PAGE_MASK);
 571         r7 = r7 & r6;
 572         p2 = r7;
 573         r7 = [p2+TI_FLAGS];
 574         CC = BITTST(r7,TIF_SYSCALL_TRACE);
 575         if CC JUMP _sys_trace;
 576         CC = BITTST(r7,TIF_SINGLESTEP);
 577         if CC JUMP _sys_trace;
 578
 579         /* Make sure the system call # is valid */
 580         p4 = __NR_syscall;
 581         /* System call number is passed in P0 */
 582         cc = p4 <= p0;
 583         if cc jump .Lbadsys;
 584
 585         /* Execute the appropriate system call */
 586
 587         p4 = p0;
 588         p5.l = _sys_call_table;
 589         p5.h = _sys_call_table;
 590         p5 = p5 + (p4 << 2);
 591         r0 = [sp + PT_R0];
 592         r1 = [sp + PT_R1];
 593         r2 = [sp + PT_R2];
 594         p5 = [p5];
 595
 596         [--sp] = r5;
 597         [--sp] = r4;
 598         [--sp] = r3;
 599         SP += -12;
 600         call (p5);
 601         SP += 24;
 602         [sp + PT_R0] = r0;
 603
 604 .Lresume_userspace:
 605         r7 = sp;
 606         r4.l = lo(ALIGN_PAGE_MASK);
 607         r4.h = hi(ALIGN_PAGE_MASK);
 608         r7 = r7 & r4;           /* thread_info->flags */
 609         p5 = r7;
 610 .Lresume_userspace_1:
 611         /* Disable interrupts.  */
 612         [--sp] = reti;
 613         reti = [sp++];
 614
 615         r7 = [p5 + TI_FLAGS];
 616         r4.l = lo(_TIF_WORK_MASK);
 617         r4.h = hi(_TIF_WORK_MASK);
 618         r7 =  r7 & r4;
 619
 620 .Lsyscall_resched:
 621 #ifdef CONFIG_IPIPE
 622         cc = BITTST(r7, TIF_IRQ_SYNC);
 623         if !cc jump .Lsyscall_no_irqsync;
 624         /*
 625          * Clear IPEND[4] manually to undo what resume_userspace_1 just did;
 626          * we need this so that high priority domain interrupts may still
 627          * preempt the current domain while the pipeline log is being played
 628          * back.
 629          */
 630         [--sp] = reti;
 631         SP += 4; /* don't merge with next insn to keep the pattern obvious */
 632         SP += -12;
 633         pseudo_long_call ___ipipe_sync_root, p4;
 634         SP += 12;
 635         jump .Lresume_userspace_1;
 636 .Lsyscall_no_irqsync:
 637 #endif
 638         cc = BITTST(r7, TIF_NEED_RESCHED);
 639         if !cc jump .Lsyscall_sigpending;
 640
 641         /* Reenable interrupts.  */
 642         [--sp] = reti;
 643         sp += 4;
 644
 645         SP += -12;
 646         pseudo_long_call _schedule, p4;
 647         SP += 12;
 648
 649         jump .Lresume_userspace_1;
 650
 651 .Lsyscall_sigpending:
 652         cc = BITTST(r7, TIF_SIGPENDING);
 653         if cc jump .Lsyscall_do_signals;
 654         cc = BITTST(r7, TIF_NOTIFY_RESUME);
 655         if !cc jump .Lsyscall_really_exit;
 656 .Lsyscall_do_signals:
 657         /* Reenable interrupts.  */
 658         [--sp] = reti;
 659         sp += 4;
 660
 661         r0 = sp;
 662         SP += -12;
 663         pseudo_long_call _do_notify_resume, p5;
 664         SP += 12;
 665
 666 .Lsyscall_really_exit:
 667         r5 = [sp + PT_RESERVED];
 668         rets = r5;
 669         rts;
 670 ENDPROC(_system_call)
 671
 672 /* Do not mark as ENTRY() to avoid error in assembler ...
 673  * this symbol need not be global anyways, so ...
 674  */
 675 _sys_trace:
 676         r0 = sp;
 677         pseudo_long_call _syscall_trace_enter, p5;
 678
 679         /* Make sure the system call # is valid */
 680         p4 = [SP + PT_P0];
 681         p3 = __NR_syscall;
 682         cc = p3 <= p4;
 683         r0 = -ENOSYS;
 684         if cc jump .Lsys_trace_badsys;
 685
 686         /* Execute the appropriate system call */
 687         p5.l = _sys_call_table;
 688         p5.h = _sys_call_table;
 689         p5 = p5 + (p4 << 2);
 690         r0 = [sp + PT_R0];
 691         r1 = [sp + PT_R1];
 692         r2 = [sp + PT_R2];
 693         r3 = [sp + PT_R3];
 694         r4 = [sp + PT_R4];
 695         r5 = [sp + PT_R5];
 696         p5 = [p5];
 697
 698         [--sp] = r5;
 699         [--sp] = r4;
 700         [--sp] = r3;
 701         SP += -12;
 702         call (p5);
 703         SP += 24;
 704 .Lsys_trace_badsys:
 705         [sp + PT_R0] = r0;
 706
 707         r0 = sp;
 708         pseudo_long_call _syscall_trace_leave, p5;
 709         jump .Lresume_userspace;
 710 ENDPROC(_sys_trace)
 711
 712 ENTRY(_resume)
 713         /*
 714          * Beware - when entering resume, prev (the current task) is
 715          * in r0, next (the new task) is in r1.
 716          */
 717         p0 = r0;
 718         p1 = r1;
 719         [--sp] = rets;
 720         [--sp] = fp;
 721         [--sp] = (r7:4, p5:3);
 722
 723         /* save usp */
 724         p2 = usp;
 725         [p0+(TASK_THREAD+THREAD_USP)] = p2;
 726
 727         /* save current kernel stack pointer */
 728         [p0+(TASK_THREAD+THREAD_KSP)] = sp;
 729
 730         /* save program counter */
 731         r1.l = _new_old_task;
 732         r1.h = _new_old_task;
 733         [p0+(TASK_THREAD+THREAD_PC)] = r1;
 734
 735         /* restore the kernel stack pointer */
 736         sp = [p1+(TASK_THREAD+THREAD_KSP)];
 737
 738         /* restore user stack pointer */
 739         p0 = [p1+(TASK_THREAD+THREAD_USP)];
 740         usp = p0;
 741
 742         /* restore pc */
 743         p0 = [p1+(TASK_THREAD+THREAD_PC)];
 744         jump (p0);
 745
 746         /*
 747          * Following code actually lands up in a new (old) task.
 748          */
 749
 750 _new_old_task:
 751         (r7:4, p5:3) = [sp++];
 752         fp = [sp++];
 753         rets = [sp++];
 754
 755         /*
 756          * When we come out of resume, r0 carries "old" task, because we are
 757          * in "new" task.
 758          */
 759         rts;
 760 ENDPROC(_resume)
 761
 762 ENTRY(_ret_from_exception)
 763 #ifdef CONFIG_IPIPE
 764         p2.l = _ipipe_percpu_domain;
 765         p2.h = _ipipe_percpu_domain;
 766         r0.l = _ipipe_root;
 767         r0.h = _ipipe_root;
 768         r2 = [p2];
 769         cc = r0 == r2;
 770         if !cc jump 4f;  /* not on behalf of the root domain, get out */
 771 #endif /* CONFIG_IPIPE */
 772         p2.l = lo(IPEND);
 773         p2.h = hi(IPEND);
 774
 775         csync;
 776         r0 = [p2];
 777         [sp + PT_IPEND] = r0;
 778
 779 1:
 780         r2 = LO(~0x37) (Z);
 781         r0 = r2 & r0;
 782         cc = r0 == 0;
 783         if !cc jump 4f; /* if not return to user mode, get out */
 784
 785         /* Make sure any pending system call or deferred exception
 786          * return in ILAT for this process to get executed, otherwise
 787          * in case context switch happens, system call of
 788          * first process (i.e in ILAT) will be carried
 789          * forward to the switched process
 790          */
 791
 792         p2.l = lo(ILAT);
 793         p2.h = hi(ILAT);
 794         r0 = [p2];
 795         r1 = (EVT_IVG14 | EVT_IVG15) (z);
 796         r0 = r0 & r1;
 797         cc = r0 == 0;
 798         if !cc jump 5f;
 799
 800         /* Set the stack for the current process */
 801         r7 = sp;
 802         r4.l = lo(ALIGN_PAGE_MASK);
 803         r4.h = hi(ALIGN_PAGE_MASK);
 804         r7 = r7 & r4;           /* thread_info->flags */
 805         p5 = r7;
 806         r7 = [p5 + TI_FLAGS];
 807         r4.l = lo(_TIF_WORK_MASK);
 808         r4.h = hi(_TIF_WORK_MASK);
 809         r7 =  r7 & r4;
 810         cc = r7 == 0;
 811         if cc jump 4f;
 812
 813         p0.l = lo(EVT15);
 814         p0.h = hi(EVT15);
 815         p1.l = _schedule_and_signal;
 816         p1.h = _schedule_and_signal;
 817         [p0] = p1;
 818         csync;
 819         raise 15;               /* raise evt15 to do signal or reschedule */
 820 4:
 821         r0 = syscfg;
 822         bitclr(r0, SYSCFG_SSSTEP_P);            /* Turn off single step */
 823         syscfg = r0;
 824 5:
 825         rts;
 826 ENDPROC(_ret_from_exception)
 827
 828 #if defined(CONFIG_PREEMPT)
 829
 830 ENTRY(_up_to_irq14)
 831 #if ANOMALY_05000281 || ANOMALY_05000461
 832         r0.l = lo(SAFE_USER_INSTRUCTION);
 833         r0.h = hi(SAFE_USER_INSTRUCTION);
 834         reti = r0;
 835 #endif
 836
 837 #ifdef CONFIG_DEBUG_HWERR
 838         /* enable irq14 & hwerr interrupt, until we transition to _evt_evt14 */
 839         r0 = (EVT_IVG14 | EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
 840 #else
 841         /* Only enable irq14 interrupt, until we transition to _evt_evt14 */
 842         r0 = (EVT_IVG14 | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
 843 #endif
 844         sti r0;
 845
 846         p0.l = lo(EVT14);
 847         p0.h = hi(EVT14);
 848         p1.l = _evt_up_evt14;
 849         p1.h = _evt_up_evt14;
 850         [p0] = p1;
 851         csync;
 852
 853         raise 14;
 854 1:
 855         jump 1b;
 856 ENDPROC(_up_to_irq14)
 857
 858 ENTRY(_evt_up_evt14)
 859 #ifdef CONFIG_DEBUG_HWERR
 860         r0 = (EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
 861         sti r0;
 862 #else
 863         cli r0;
 864 #endif
 865 #ifdef CONFIG_TRACE_IRQFLAGS
 866         [--sp] = rets;
 867         sp += -12;
 868         call _trace_hardirqs_off;
 869         sp += 12;
 870         rets = [sp++];
 871 #endif
 872         [--sp] = RETI;
 873         SP += 4;
 874
 875         /* restore normal evt14 */
 876         p0.l = lo(EVT14);
 877         p0.h = hi(EVT14);
 878         p1.l = _evt_evt14;
 879         p1.h = _evt_evt14;
 880         [p0] = p1;
 881         csync;
 882
 883         rts;
 884 ENDPROC(_evt_up_evt14)
 885
 886 #endif
 887
 888 #ifdef CONFIG_IPIPE
 889
 890 _resume_kernel_from_int:
 891         r1 = LO(~0x8000) (Z);
 892         r1 = r0 & r1;
 893         r0 = 1;
 894         r0 = r1 - r0;
 895         r2 = r1 & r0;
 896         cc = r2 == 0;
 897         /* Sync the root stage only from the outer interrupt level. */
 898         if !cc jump .Lnosync;
 899         r0.l = ___ipipe_sync_root;
 900         r0.h = ___ipipe_sync_root;
 901         [--sp] = reti;
 902         [--sp] = rets;
 903         [--sp] = ( r7:4, p5:3 );
 904         SP += -12;
 905         call ___ipipe_call_irqtail
 906         SP += 12;
 907         ( r7:4, p5:3 ) = [sp++];
 908         rets = [sp++];
 909         reti = [sp++];
 910 .Lnosync:
 911         rts
 912 #elif defined(CONFIG_PREEMPT)
 913
 914 _resume_kernel_from_int:
 915         /* check preempt_count */
 916         r7 = sp;
 917         r4.l = lo(ALIGN_PAGE_MASK);
 918         r4.h = hi(ALIGN_PAGE_MASK);
 919         r7 = r7 & r4;
 920         p5 = r7;
 921         r7 = [p5 + TI_PREEMPT];
 922         cc = r7 == 0x0;
 923         if !cc jump .Lreturn_to_kernel;
 924 .Lneed_schedule:
 925         r7 = [p5 + TI_FLAGS];
 926         r4.l = lo(_TIF_WORK_MASK);
 927         r4.h = hi(_TIF_WORK_MASK);
 928         r7 =  r7 & r4;
 929         cc = BITTST(r7, TIF_NEED_RESCHED);
 930         if !cc jump .Lreturn_to_kernel;
 931         /*
 932          * let schedule done at level 15, otherwise sheduled process will run
 933          * at high level and block low level interrupt
 934          */
 935         r6 = reti;  /* save reti */
 936         r5.l = .Lkernel_schedule;
 937         r5.h = .Lkernel_schedule;
 938         reti = r5;
 939         rti;
 940 .Lkernel_schedule:
 941         [--sp] = rets;
 942         sp += -12;
 943         pseudo_long_call _preempt_schedule_irq, p4;
 944         sp += 12;
 945         rets = [sp++];
 946
 947         [--sp] = rets;
 948         sp += -12;
 949         /* up to irq14 so that reti after restore_all can return to irq15(kernel) */
 950         pseudo_long_call _up_to_irq14, p4;
 951         sp += 12;
 952         rets = [sp++];
 953
 954         reti = r6; /* restore reti so that origin process can return to interrupted point */
 955
 956         jump .Lneed_schedule;
 957 #else
 958
 959 #define _resume_kernel_from_int .Lreturn_to_kernel
 960 #endif
 961
 962 ENTRY(_return_from_int)
 963         /* If someone else already raised IRQ 15, do nothing.  */
 964         csync;
 965         p2.l = lo(ILAT);
 966         p2.h = hi(ILAT);
 967         r0 = [p2];
 968         cc = bittst (r0, EVT_IVG15_P);
 969         if cc jump .Lreturn_to_kernel;
 970
 971         /* if not return to user mode, get out */
 972         p2.l = lo(IPEND);
 973         p2.h = hi(IPEND);
 974         r0 = [p2];
 975         r1 = 0x17(Z);
 976         r2 = ~r1;
 977         r2.h = 0;
 978         r0 = r2 & r0;
 979         r1 = 1;
 980         r1 = r0 - r1;
 981         r2 = r0 & r1;
 982         cc = r2 == 0;
 983         if !cc jump _resume_kernel_from_int;
 984
 985         /* Lower the interrupt level to 15.  */
 986         p0.l = lo(EVT15);
 987         p0.h = hi(EVT15);
 988         p1.l = _schedule_and_signal_from_int;
 989         p1.h = _schedule_and_signal_from_int;
 990         [p0] = p1;
 991         csync;
 992 #if ANOMALY_05000281 || ANOMALY_05000461
 993         r0.l = lo(SAFE_USER_INSTRUCTION);
 994         r0.h = hi(SAFE_USER_INSTRUCTION);
 995         reti = r0;
 996 #endif
 997         r0 = 0x801f (z);
 998         STI r0;
 999         raise 15;       /* raise evt15 to do signal or reschedule */
1000         rti;
1001 .Lreturn_to_kernel:
1002         rts;
1003 ENDPROC(_return_from_int)
1004
1005 ENTRY(_lower_to_irq14)
1006 #if ANOMALY_05000281 || ANOMALY_05000461
1007         r0.l = lo(SAFE_USER_INSTRUCTION);
1008         r0.h = hi(SAFE_USER_INSTRUCTION);
1009         reti = r0;
1010 #endif
1011
1012 #ifdef CONFIG_DEBUG_HWERR
1013         /* enable irq14 & hwerr interrupt, until we transition to _evt_evt14 */
1014         r0 = (EVT_IVG14 | EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
1015 #else
1016         /* Only enable irq14 interrupt, until we transition to _evt_evt14 */
1017         r0 = (EVT_IVG14 | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
1018 #endif
1019         sti r0;
1020         raise 14;
1021         rti;
1022 ENDPROC(_lower_to_irq14)
1023
1024 ENTRY(_evt_evt14)
1025 #ifdef CONFIG_DEBUG_HWERR
1026         r0 = (EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
1027         sti r0;
1028 #else
1029         cli r0;
1030 #endif
1031 #ifdef CONFIG_TRACE_IRQFLAGS
1032         [--sp] = rets;
1033         sp += -12;
1034         call _trace_hardirqs_off;
1035         sp += 12;
1036         rets = [sp++];
1037 #endif
1038         [--sp] = RETI;
1039         SP += 4;
1040         rts;
1041 ENDPROC(_evt_evt14)
1042
1043 ENTRY(_schedule_and_signal_from_int)
1044         /* To end up here, vector 15 was changed - so we have to change it
1045          * back.
1046          */
1047         p0.l = lo(EVT15);
1048         p0.h = hi(EVT15);
1049         p1.l = _evt_system_call;
1050         p1.h = _evt_system_call;
1051         [p0] = p1;
1052         csync;
1053
1054         /* Set orig_p0 to -1 to indicate this isn't the end of a syscall.  */
1055         r0 = -1 (x);
1056         [sp + PT_ORIG_P0] = r0;
1057
1058         p1 = rets;
1059         [sp + PT_RESERVED] = p1;
1060
1061 #ifdef CONFIG_TRACE_IRQFLAGS
1062         /* trace_hardirqs_on() checks if all irqs are disabled. But here IRQ 15
1063          * is turned on, so disable all irqs. */
1064         cli r0;
1065         sp += -12;
1066         call _trace_hardirqs_on;
1067         sp += 12;
1068 #endif
1069 #ifdef CONFIG_SMP
1070         GET_PDA(p0, r0);        /* Fetch current PDA (can't migrate to other CPU here) */
1071         r0 = [p0 + PDA_IRQFLAGS];
1072 #else
1073         p0.l = _bfin_irq_flags;
1074         p0.h = _bfin_irq_flags;
1075         r0 = [p0];
1076 #endif
1077         sti r0;
1078
1079         /* finish the userspace "atomic" functions for it */
1080         r1.l = lo(FIXED_CODE_END);
1081         r1.h = hi(FIXED_CODE_END);
1082         r2 = [sp + PT_PC];
1083         cc = r1 <= r2;
1084         if cc jump .Lresume_userspace (bp);
1085
1086         r0 = sp;
1087         sp += -12;
1088
1089         pseudo_long_call _finish_atomic_sections, p5;
1090         sp += 12;
1091         jump.s .Lresume_userspace;
1092 ENDPROC(_schedule_and_signal_from_int)
1093
1094 ENTRY(_schedule_and_signal)
1095         SAVE_CONTEXT_SYSCALL
1096         /* To end up here, vector 15 was changed - so we have to change it
1097          * back.
1098          */
1099         p0.l = lo(EVT15);
1100         p0.h = hi(EVT15);
1101         p1.l = _evt_system_call;
1102         p1.h = _evt_system_call;
1103         [p0] = p1;
1104         csync;
1105         p0.l = 1f;
1106         p0.h = 1f;
1107         [sp + PT_RESERVED] = P0;
1108         call .Lresume_userspace;
1109 1:
1110         RESTORE_CONTEXT
1111         rti;
1112 ENDPROC(_schedule_and_signal)
1113
1114 /* We handle this 100% in exception space - to reduce overhead
1115  * Only potiential problem is if the software buffer gets swapped out of the
1116  * CPLB table - then double fault. - so we don't let this happen in other places
1117  */
1118 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
1119 ENTRY(_ex_trace_buff_full)
1120         [--sp] = P3;
1121         [--sp] = P2;
1122         [--sp] = LC0;
1123         [--sp] = LT0;
1124         [--sp] = LB0;
1125         P5.L = _trace_buff_offset;
1126         P5.H = _trace_buff_offset;
1127         P3 = [P5];              /* trace_buff_offset */
1128         P5.L = lo(TBUFSTAT);
1129         P5.H = hi(TBUFSTAT);
1130         R7 = [P5];
1131         R7 <<= 1;               /* double, since we need to read twice */
1132         LC0 = R7;
1133         R7 <<= 2;               /* need to shift over again,
1134                                  * to get the number of bytes */
1135         P5.L = lo(TBUF);
1136         P5.H = hi(TBUF);
1137         R6 = ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*1024) - 1;
1138
1139         P2 = R7;
1140         P3 = P3 + P2;
1141         R7 = P3;
1142         R7 = R7 & R6;
1143         P3 = R7;
1144         P2.L = _trace_buff_offset;
1145         P2.H = _trace_buff_offset;
1146         [P2] = P3;
1147
1148         P2.L = _software_trace_buff;
1149         P2.H = _software_trace_buff;
1150
1151         LSETUP (.Lstart, .Lend) LC0;
1152 .Lstart:
1153         R7 = [P5];      /* read TBUF */
1154         P4 = P3 + P2;
1155         [P4] = R7;
1156         P3 += -4;
1157         R7 = P3;
1158         R7 = R7 & R6;
1159 .Lend:
1160         P3 = R7;
1161
1162         LB0 = [sp++];
1163         LT0 = [sp++];
1164         LC0 = [sp++];
1165         P2 = [sp++];
1166         P3 = [sp++];
1167         jump _bfin_return_from_exception;
1168 ENDPROC(_ex_trace_buff_full)
1169
1170 #if CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN == 4
1171 .data
1172 #else
1173 .section .l1.data.B
1174 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN */
1175 ENTRY(_trace_buff_offset)
1176         .long 0;
1177 ALIGN
1178 ENTRY(_software_trace_buff)
1179         .rept ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*256);
1180         .long 0
1181         .endr
1182 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND */
1183
1184 #ifdef CONFIG_EARLY_PRINTK
1185 __INIT
1186 ENTRY(_early_trap)
1187         SAVE_ALL_SYS
1188         trace_buffer_stop(p0,r0);
1189
1190         ANOMALY_283_315_WORKAROUND(p4, r5)
1191
1192         /* Turn caches off, to ensure we don't get double exceptions */
1193
1194         P4.L = LO(IMEM_CONTROL);
1195         P4.H = HI(IMEM_CONTROL);
1196
1197         R5 = [P4];              /* Control Register*/
1198         BITCLR(R5,ENICPLB_P);
1199         CSYNC;          /* Disabling of CPLBs should be proceeded by a CSYNC */
1200         [P4] = R5;
1201         SSYNC;
1202
1203         P4.L = LO(DMEM_CONTROL);
1204         P4.H = HI(DMEM_CONTROL);
1205         R5 = [P4];
1206         BITCLR(R5,ENDCPLB_P);
1207         CSYNC;          /* Disabling of CPLBs should be proceeded by a CSYNC */
1208         [P4] = R5;
1209         SSYNC;
1210
1211         r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
1212         r1 = RETX;
1213
1214         SP += -12;
1215         call _early_trap_c;
1216         SP += 12;
1217 ENDPROC(_early_trap)
1218 __FINIT
1219 #endif /* CONFIG_EARLY_PRINTK */
1220
1221 /*
1222  * Put these in the kernel data section - that should always be covered by
1223  * a CPLB. This is needed to ensure we don't get double fault conditions
1224  */
1225
1226 #ifdef CONFIG_SYSCALL_TAB_L1
1227 .section .l1.data
1228 #else
1229 .data
1230 #endif
1231
1232 ENTRY(_ex_table)
1233         /* entry for each EXCAUSE[5:0]
1234          * This table must be in sync with the table in ./kernel/traps.c
1235          * EXCPT instruction can provide 4 bits of EXCAUSE, allowing 16 to be user defined
1236          */
1237         .long _ex_syscall       /* 0x00 - User Defined - Linux Syscall */
1238         .long _ex_trap_c        /* 0x01 - User Defined - Software breakpoint */
1239 #ifdef  CONFIG_KGDB
1240         .long _ex_trap_c        /* 0x02 - User Defined - KGDB initial connection
1241                                                          and break signal trap */
1242 #else
1243         .long _ex_replaceable   /* 0x02 - User Defined */
1244 #endif
1245         .long _ex_trap_c        /* 0x03 - User Defined - userspace stack overflow */
1246         .long _ex_trap_c        /* 0x04 - User Defined - dump trace buffer */
1247         .long _ex_replaceable   /* 0x05 - User Defined */
1248         .long _ex_replaceable   /* 0x06 - User Defined */
1249         .long _ex_replaceable   /* 0x07 - User Defined */
1250         .long _ex_replaceable   /* 0x08 - User Defined */
1251         .long _ex_replaceable   /* 0x09 - User Defined */
1252         .long _ex_replaceable   /* 0x0A - User Defined */
1253         .long _ex_replaceable   /* 0x0B - User Defined */
1254         .long _ex_replaceable   /* 0x0C - User Defined */
1255         .long _ex_replaceable   /* 0x0D - User Defined */
1256         .long _ex_replaceable   /* 0x0E - User Defined */
1257         .long _ex_replaceable   /* 0x0F - User Defined */
1258         .long _ex_single_step   /* 0x10 - HW Single step */
1259 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
1260         .long _ex_trace_buff_full /* 0x11 - Trace Buffer Full */
1261 #else
1262         .long _ex_trap_c        /* 0x11 - Trace Buffer Full */
1263 #endif
1264         .long _ex_trap_c        /* 0x12 - Reserved */
1265         .long _ex_trap_c        /* 0x13 - Reserved */
1266         .long _ex_trap_c        /* 0x14 - Reserved */
1267         .long _ex_trap_c        /* 0x15 - Reserved */
1268         .long _ex_trap_c        /* 0x16 - Reserved */
1269         .long _ex_trap_c        /* 0x17 - Reserved */
1270         .long _ex_trap_c        /* 0x18 - Reserved */
1271         .long _ex_trap_c        /* 0x19 - Reserved */
1272         .long _ex_trap_c        /* 0x1A - Reserved */
1273         .long _ex_trap_c        /* 0x1B - Reserved */
1274         .long _ex_trap_c        /* 0x1C - Reserved */
1275         .long _ex_trap_c        /* 0x1D - Reserved */
1276         .long _ex_trap_c        /* 0x1E - Reserved */
1277         .long _ex_trap_c        /* 0x1F - Reserved */
1278         .long _ex_trap_c        /* 0x20 - Reserved */
1279         .long _ex_trap_c        /* 0x21 - Undefined Instruction */
1280         .long _ex_trap_c        /* 0x22 - Illegal Instruction Combination */
1281         .long _ex_dviol         /* 0x23 - Data CPLB Protection Violation */
1282         .long _ex_trap_c        /* 0x24 - Data access misaligned */
1283         .long _ex_trap_c        /* 0x25 - Unrecoverable Event */
1284         .long _ex_dmiss         /* 0x26 - Data CPLB Miss */
1285         .long _ex_dmult         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero */
1286         .long _ex_trap_c        /* 0x28 - Emulation Watchpoint */
1287         .long _ex_trap_c        /* 0x29 - Instruction fetch access error (535 only) */
1288         .long _ex_trap_c        /* 0x2A - Instruction fetch misaligned */
1289         .long _ex_trap_c        /* 0x2B - Instruction CPLB protection Violation */
1290         .long _ex_icplb_miss    /* 0x2C - Instruction CPLB miss */
1291         .long _ex_trap_c        /* 0x2D - Instruction CPLB Multiple Hits */
1292         .long _ex_trap_c        /* 0x2E - Illegal use of Supervisor Resource */
1293         .long _ex_trap_c        /* 0x2E - Illegal use of Supervisor Resource */
1294         .long _ex_trap_c        /* 0x2F - Reserved */
1295         .long _ex_trap_c        /* 0x30 - Reserved */
1296         .long _ex_trap_c        /* 0x31 - Reserved */
1297         .long _ex_trap_c        /* 0x32 - Reserved */
1298         .long _ex_trap_c        /* 0x33 - Reserved */
1299         .long _ex_trap_c        /* 0x34 - Reserved */
1300         .long _ex_trap_c        /* 0x35 - Reserved */
1301         .long _ex_trap_c        /* 0x36 - Reserved */
1302         .long _ex_trap_c        /* 0x37 - Reserved */
1303         .long _ex_trap_c        /* 0x38 - Reserved */
1304         .long _ex_trap_c        /* 0x39 - Reserved */
1305         .long _ex_trap_c        /* 0x3A - Reserved */
1306         .long _ex_trap_c        /* 0x3B - Reserved */
1307         .long _ex_trap_c        /* 0x3C - Reserved */
1308         .long _ex_trap_c        /* 0x3D - Reserved */
1309         .long _ex_trap_c        /* 0x3E - Reserved */
1310         .long _ex_trap_c        /* 0x3F - Reserved */
1311 END(_ex_table)
1312
1313 ENTRY(_sys_call_table)
1314         .long _sys_restart_syscall      /* 0 */
1315         .long _sys_exit
1316         .long _sys_ni_syscall   /* fork */
1317         .long _sys_read
1318         .long _sys_write
1319         .long _sys_open         /* 5 */
1320         .long _sys_close
1321         .long _sys_ni_syscall   /* old waitpid */
1322         .long _sys_creat
1323         .long _sys_link
1324         .long _sys_unlink       /* 10 */
1325         .long _sys_execve
1326         .long _sys_chdir
1327         .long _sys_time
1328         .long _sys_mknod
1329         .long _sys_chmod                /* 15 */
1330         .long _sys_chown        /* chown16 */
1331         .long _sys_ni_syscall   /* old break syscall holder */
1332         .long _sys_ni_syscall   /* old stat */
1333         .long _sys_lseek
1334         .long _sys_getpid       /* 20 */
1335         .long _sys_mount
1336         .long _sys_ni_syscall   /* old umount */
1337         .long _sys_setuid
1338         .long _sys_getuid
1339         .long _sys_stime                /* 25 */
1340         .long _sys_ptrace
1341         .long _sys_alarm
1342         .long _sys_ni_syscall   /* old fstat */
1343         .long _sys_pause
1344         .long _sys_ni_syscall   /* old utime */ /* 30 */
1345         .long _sys_ni_syscall   /* old stty syscall holder */
1346         .long _sys_ni_syscall   /* old gtty syscall holder */
1347         .long _sys_access
1348         .long _sys_nice
1349         .long _sys_ni_syscall   /* 35 */ /* old ftime syscall holder */
1350         .long _sys_sync
1351         .long _sys_kill
1352         .long _sys_rename
1353         .long _sys_mkdir
1354         .long _sys_rmdir                /* 40 */
1355         .long _sys_dup
1356         .long _sys_pipe
1357         .long _sys_times
1358         .long _sys_ni_syscall   /* old prof syscall holder */
1359         .long _sys_brk          /* 45 */
1360         .long _sys_setgid
1361         .long _sys_getgid
1362         .long _sys_ni_syscall   /* old sys_signal */
1363         .long _sys_geteuid      /* geteuid16 */
1364         .long _sys_getegid      /* getegid16 */ /* 50 */
1365         .long _sys_acct
1366         .long _sys_umount       /* recycled never used phys() */
1367         .long _sys_ni_syscall   /* old lock syscall holder */
1368         .long _sys_ioctl
1369         .long _sys_fcntl                /* 55 */
1370         .long _sys_ni_syscall   /* old mpx syscall holder */
1371         .long _sys_setpgid
1372         .long _sys_ni_syscall   /* old ulimit syscall holder */
1373         .long _sys_ni_syscall   /* old old uname */
1374         .long _sys_umask                /* 60 */
1375         .long _sys_chroot
1376         .long _sys_ustat
1377         .long _sys_dup2
1378         .long _sys_getppid
1379         .long _sys_getpgrp      /* 65 */
1380         .long _sys_setsid
1381         .long _sys_ni_syscall   /* old sys_sigaction */
1382         .long _sys_sgetmask
1383         .long _sys_ssetmask
1384         .long _sys_setreuid     /* setreuid16 */        /* 70 */
1385         .long _sys_setregid     /* setregid16 */
1386         .long _sys_ni_syscall   /* old sys_sigsuspend */
1387         .long _sys_ni_syscall   /* old sys_sigpending */
1388         .long _sys_sethostname
1389         .long _sys_setrlimit    /* 75 */
1390         .long _sys_ni_syscall   /* old getrlimit */
1391         .long _sys_getrusage
1392         .long _sys_gettimeofday
1393         .long _sys_settimeofday
1394         .long _sys_getgroups    /* getgroups16 */       /* 80 */
1395         .long _sys_setgroups    /* setgroups16 */
1396         .long _sys_ni_syscall   /* old_select */
1397         .long _sys_symlink
1398         .long _sys_ni_syscall   /* old lstat */
1399         .long _sys_readlink     /* 85 */
1400         .long _sys_uselib
1401         .long _sys_ni_syscall   /* sys_swapon */
1402         .long _sys_reboot
1403         .long _sys_ni_syscall   /* old_readdir */
1404         .long _sys_ni_syscall   /* sys_mmap */  /* 90 */
1405         .long _sys_munmap
1406         .long _sys_truncate
1407         .long _sys_ftruncate
1408         .long _sys_fchmod
1409         .long _sys_fchown       /* fchown16 */  /* 95 */
1410         .long _sys_getpriority
1411         .long _sys_setpriority
1412         .long _sys_ni_syscall   /* old profil syscall holder */
1413         .long _sys_statfs
1414         .long _sys_fstatfs      /* 100 */
1415         .long _sys_ni_syscall
1416         .long _sys_ni_syscall   /* old sys_socketcall */
1417         .long _sys_syslog
1418         .long _sys_setitimer
1419         .long _sys_getitimer    /* 105 */
1420         .long _sys_newstat
1421         .long _sys_newlstat
1422         .long _sys_newfstat
1423         .long _sys_ni_syscall   /* old uname */
1424         .long _sys_ni_syscall   /* iopl for i386 */ /* 110 */
1425         .long _sys_vhangup
1426         .long _sys_ni_syscall   /* obsolete idle() syscall */
1427         .long _sys_ni_syscall   /* vm86old for i386 */
1428         .long _sys_wait4
1429         .long _sys_ni_syscall   /* 115 */ /* sys_swapoff */
1430         .long _sys_sysinfo
1431         .long _sys_ni_syscall   /* old sys_ipc */
1432         .long _sys_fsync
1433         .long _sys_ni_syscall   /* old sys_sigreturn */
1434         .long _bfin_clone               /* 120 */
1435         .long _sys_setdomainname
1436         .long _sys_newuname
1437         .long _sys_ni_syscall   /* old sys_modify_ldt */
1438         .long _sys_adjtimex
1439         .long _sys_mprotect     /* 125 */
1440         .long _sys_ni_syscall   /* old sys_sigprocmask */
1441         .long _sys_ni_syscall   /* old "creat_module" */
1442         .long _sys_init_module
1443         .long _sys_delete_module
1444         .long _sys_ni_syscall   /* 130: old "get_kernel_syms" */
1445         .long _sys_quotactl
1446         .long _sys_getpgid
1447         .long _sys_fchdir
1448         .long _sys_bdflush
1449         .long _sys_ni_syscall   /* 135 */ /* sys_sysfs */
1450         .long _sys_personality
1451         .long _sys_ni_syscall   /* for afs_syscall */
1452         .long _sys_setfsuid     /* setfsuid16 */
1453         .long _sys_setfsgid     /* setfsgid16 */
1454         .long _sys_llseek       /* 140 */
1455         .long _sys_getdents
1456         .long _sys_ni_syscall   /* sys_select */
1457         .long _sys_flock
1458         .long _sys_msync
1459         .long _sys_readv                /* 145 */
1460         .long _sys_writev
1461         .long _sys_getsid
1462         .long _sys_fdatasync
1463         .long _sys_sysctl
1464         .long _sys_mlock        /* 150 */
1465         .long _sys_munlock
1466         .long _sys_mlockall
1467         .long _sys_munlockall
1468         .long _sys_sched_setparam
1469         .long _sys_sched_getparam /* 155 */
1470         .long _sys_sched_setscheduler
1471         .long _sys_sched_getscheduler
1472         .long _sys_sched_yield
1473         .long _sys_sched_get_priority_max
1474         .long _sys_sched_get_priority_min  /* 160 */
1475         .long _sys_sched_rr_get_interval
1476         .long _sys_nanosleep
1477         .long _sys_mremap
1478         .long _sys_setresuid    /* setresuid16 */
1479         .long _sys_getresuid    /* getresuid16 */       /* 165 */
1480         .long _sys_ni_syscall   /* for vm86 */
1481         .long _sys_ni_syscall   /* old "query_module" */
1482         .long _sys_ni_syscall   /* sys_poll */
1483         .long _sys_ni_syscall   /* old nfsservctl */
1484         .long _sys_setresgid    /* setresgid16 */       /* 170 */
1485         .long _sys_getresgid    /* getresgid16 */
1486         .long _sys_prctl
1487         .long _sys_rt_sigreturn
1488         .long _sys_rt_sigaction
1489         .long _sys_rt_sigprocmask /* 175 */
1490         .long _sys_rt_sigpending
1491         .long _sys_rt_sigtimedwait
1492         .long _sys_rt_sigqueueinfo
1493         .long _sys_rt_sigsuspend
1494         .long _sys_pread64      /* 180 */
1495         .long _sys_pwrite64
1496         .long _sys_lchown       /* lchown16 */
1497         .long _sys_getcwd
1498         .long _sys_capget
1499         .long _sys_capset       /* 185 */
1500         .long _sys_sigaltstack
1501         .long _sys_sendfile
1502         .long _sys_ni_syscall   /* streams1 */
1503         .long _sys_ni_syscall   /* streams2 */
1504         .long _sys_vfork                /* 190 */
1505         .long _sys_getrlimit
1506         .long _sys_mmap_pgoff
1507         .long _sys_truncate64
1508         .long _sys_ftruncate64
1509         .long _sys_stat64       /* 195 */
1510         .long _sys_lstat64
1511         .long _sys_fstat64
1512         .long _sys_chown
1513         .long _sys_getuid
1514         .long _sys_getgid       /* 200 */
1515         .long _sys_geteuid
1516         .long _sys_getegid
1517         .long _sys_setreuid
1518         .long _sys_setregid
1519         .long _sys_getgroups    /* 205 */
1520         .long _sys_setgroups
1521         .long _sys_fchown
1522         .long _sys_setresuid
1523         .long _sys_getresuid
1524         .long _sys_setresgid    /* 210 */
1525         .long _sys_getresgid
1526         .long _sys_lchown
1527         .long _sys_setuid
1528         .long _sys_setgid
1529         .long _sys_setfsuid     /* 215 */
1530         .long _sys_setfsgid
1531         .long _sys_pivot_root
1532         .long _sys_mincore
1533         .long _sys_madvise
1534         .long _sys_getdents64   /* 220 */
1535         .long _sys_fcntl64
1536         .long _sys_ni_syscall   /* reserved for TUX */
1537         .long _sys_ni_syscall
1538         .long _sys_gettid
1539         .long _sys_readahead    /* 225 */
1540         .long _sys_setxattr
1541         .long _sys_lsetxattr
1542         .long _sys_fsetxattr
1543         .long _sys_getxattr
1544         .long _sys_lgetxattr    /* 230 */
1545         .long _sys_fgetxattr
1546         .long _sys_listxattr
1547         .long _sys_llistxattr
1548         .long _sys_flistxattr
1549         .long _sys_removexattr  /* 235 */
1550         .long _sys_lremovexattr
1551         .long _sys_fremovexattr
1552         .long _sys_tkill
1553         .long _sys_sendfile64
1554         .long _sys_futex                /* 240 */
1555         .long _sys_sched_setaffinity
1556         .long _sys_sched_getaffinity
1557         .long _sys_ni_syscall   /* sys_set_thread_area */
1558         .long _sys_ni_syscall   /* sys_get_thread_area */
1559         .long _sys_io_setup     /* 245 */
1560         .long _sys_io_destroy
1561         .long _sys_io_getevents
1562         .long _sys_io_submit
1563         .long _sys_io_cancel
1564         .long _sys_ni_syscall   /* 250 */ /* sys_alloc_hugepages */
1565         .long _sys_ni_syscall   /* sys_freec_hugepages */
1566         .long _sys_exit_group
1567         .long _sys_lookup_dcookie
1568         .long _sys_bfin_spinlock
1569         .long _sys_epoll_create /* 255 */
1570         .long _sys_epoll_ctl
1571         .long _sys_epoll_wait
1572         .long _sys_ni_syscall /* remap_file_pages */
1573         .long _sys_set_tid_address
1574         .long _sys_timer_create /* 260 */
1575         .long _sys_timer_settime
1576         .long _sys_timer_gettime
1577         .long _sys_timer_getoverrun
1578         .long _sys_timer_delete
1579         .long _sys_clock_settime /* 265 */
1580         .long _sys_clock_gettime
1581         .long _sys_clock_getres
1582         .long _sys_clock_nanosleep
1583         .long _sys_statfs64
1584         .long _sys_fstatfs64    /* 270 */
1585         .long _sys_tgkill
1586         .long _sys_utimes
1587         .long _sys_fadvise64_64
1588         .long _sys_ni_syscall /* vserver */
1589         .long _sys_mbind        /* 275 */
1590         .long _sys_ni_syscall /* get_mempolicy */
1591         .long _sys_ni_syscall /* set_mempolicy */
1592         .long _sys_mq_open
1593         .long _sys_mq_unlink
1594         .long _sys_mq_timedsend /* 280 */
1595         .long _sys_mq_timedreceive
1596         .long _sys_mq_notify
1597         .long _sys_mq_getsetattr
1598         .long _sys_ni_syscall /* kexec_load */
1599         .long _sys_waitid       /* 285 */
1600         .long _sys_add_key
1601         .long _sys_request_key
1602         .long _sys_keyctl
1603         .long _sys_ioprio_set
1604         .long _sys_ioprio_get   /* 290 */
1605         .long _sys_inotify_init
1606         .long _sys_inotify_add_watch
1607         .long _sys_inotify_rm_watch
1608         .long _sys_ni_syscall /* migrate_pages */
1609         .long _sys_openat       /* 295 */
1610         .long _sys_mkdirat
1611         .long _sys_mknodat
1612         .long _sys_fchownat
1613         .long _sys_futimesat
1614         .long _sys_fstatat64    /* 300 */
1615         .long _sys_unlinkat
1616         .long _sys_renameat
1617         .long _sys_linkat
1618         .long _sys_symlinkat
1619         .long _sys_readlinkat   /* 305 */
1620         .long _sys_fchmodat
1621         .long _sys_faccessat
1622         .long _sys_pselect6
1623         .long _sys_ppoll
1624         .long _sys_unshare      /* 310 */
1625         .long _sys_sram_alloc
1626         .long _sys_sram_free
1627         .long _sys_dma_memcpy
1628         .long _sys_accept
1629         .long _sys_bind         /* 315 */
1630         .long _sys_connect
1631         .long _sys_getpeername
1632         .long _sys_getsockname
1633         .long _sys_getsockopt
1634         .long _sys_listen       /* 320 */
1635         .long _sys_recv
1636         .long _sys_recvfrom
1637         .long _sys_recvmsg
1638         .long _sys_send
1639         .long _sys_sendmsg      /* 325 */
1640         .long _sys_sendto
1641         .long _sys_setsockopt
1642         .long _sys_shutdown
1643         .long _sys_socket
1644         .long _sys_socketpair   /* 330 */
1645         .long _sys_semctl
1646         .long _sys_semget
1647         .long _sys_semop
1648         .long _sys_msgctl
1649         .long _sys_msgget       /* 335 */
1650         .long _sys_msgrcv
1651         .long _sys_msgsnd
1652         .long _sys_shmat
1653         .long _sys_shmctl
1654         .long _sys_shmdt        /* 340 */
1655         .long _sys_shmget
1656         .long _sys_splice
1657         .long _sys_sync_file_range
1658         .long _sys_tee
1659         .long _sys_vmsplice     /* 345 */
1660         .long _sys_epoll_pwait
1661         .long _sys_utimensat
1662         .long _sys_signalfd
1663         .long _sys_timerfd_create
1664         .long _sys_eventfd      /* 350 */
1665         .long _sys_pread64
1666         .long _sys_pwrite64
1667         .long _sys_fadvise64
1668         .long _sys_set_robust_list
1669         .long _sys_get_robust_list      /* 355 */
1670         .long _sys_fallocate
1671         .long _sys_semtimedop
1672         .long _sys_timerfd_settime
1673         .long _sys_timerfd_gettime
1674         .long _sys_signalfd4            /* 360 */
1675         .long _sys_eventfd2
1676         .long _sys_epoll_create1
1677         .long _sys_dup3
1678         .long _sys_pipe2
1679         .long _sys_inotify_init1        /* 365 */
1680         .long _sys_preadv
1681         .long _sys_pwritev
1682         .long _sys_rt_tgsigqueueinfo
1683         .long _sys_perf_event_open
1684         .long _sys_recvmmsg             /* 370 */
1685         .long _sys_fanotify_init
1686         .long _sys_fanotify_mark
1687         .long _sys_prlimit64
1688         .long _sys_cacheflush
1689         .long _sys_name_to_handle_at    /* 375 */
1690         .long _sys_open_by_handle_at
1691         .long _sys_clock_adjtime
1692         .long _sys_syncfs
1693         .long _sys_setns
1694         .long _sys_sendmmsg             /* 380 */
1695         .long _sys_process_vm_readv
1696         .long _sys_process_vm_writev
1697
1698         .rept NR_syscalls-(.-_sys_call_table)/4
1699         .long _sys_ni_syscall
1700         .endr
1701 END(_sys_call_table)