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