LXR linux/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
  44ENTRY(_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;
  72ENDPROC(_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
  85ENTRY(_ex_dcplb_viol)
  86ENTRY(_ex_dcplb_miss)
  87ENTRY(_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;
 121ENDPROC(_ex_icplb_miss)
 122
 123ENTRY(_ex_syscall)
 124        raise 15;               /* invoked by TRAP #0, for sys call */
 125        jump.s _bfin_return_from_exception;
 126ENDPROC(_ex_syscall)
 127
 128ENTRY(_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
 1971:
 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;
 2092:
 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.  */
 230ENDPROC(_ex_single_step)
 231
 232ENTRY(_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;
 257ENDPROC(_bfin_return_from_exception)
 258
 259ENTRY(_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
 272ENTRY(_ex_replaceable)
 273        nop;
 274
 275ENTRY(_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;
 356ENDPROC(_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 */
 362ENTRY(_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
 406ENDPROC(_double_fault)
 407
 408ENTRY(_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++];
 4561:
 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;
 464ENDPROC(_exception_to_level5)
 465
 466ENTRY(_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;
 531ENDPROC(_trap)
 532
 533ENTRY(_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;
 670ENDPROC(_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;
 710ENDPROC(_sys_trace)
 711
 712ENTRY(_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;
 760ENDPROC(_resume)
 761
 762ENTRY(_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
 7791:
 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 */
 8204:
 821        r0 = syscfg;
 822        bitclr(r0, SYSCFG_SSSTEP_P);            /* Turn off single step */
 823        syscfg = r0;
 8245:
 825        rts;
 826ENDPROC(_ret_from_exception)
 827
 828#if defined(CONFIG_PREEMPT)
 829
 830ENTRY(_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;
 8541:
 855        jump 1b;
 856ENDPROC(_up_to_irq14)
 857
 858ENTRY(_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;
 884ENDPROC(_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
 962ENTRY(_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;
1003ENDPROC(_return_from_int)
1004
1005ENTRY(_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;
1022ENDPROC(_lower_to_irq14)
1023
1024ENTRY(_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;
1041ENDPROC(_evt_evt14)
1042
1043ENTRY(_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;
1092ENDPROC(_schedule_and_signal_from_int)
1093
1094ENTRY(_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;
11091:
1110        RESTORE_CONTEXT
1111        rti;
1112ENDPROC(_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
1119ENTRY(_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;
1168ENDPROC(_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 */
1175ENTRY(_trace_buff_offset)
1176        .long 0;
1177ALIGN
1178ENTRY(_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
1186ENTRY(_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;
1217ENDPROC(_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
1232ENTRY(_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 */
1311END(_ex_table)
1312
1313ENTRY(_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
1701END(_sys_call_table)
1702