arch/blackfin/mach-common/entry.S

   1 /*
   2  * File:         arch/blackfin/mach-common/entry.S
   3  * Based on:
   4  * Author:       Linus Torvalds
   5  *
   6  * Created:      ?
   7  * Description:  contains the system-call and fault low-level handling routines.
   8  *               This also contains the timer-interrupt handler, as well as all
   9  *               interrupts and faults that can result in a task-switch.
  10  *
  11  * Modified:
  12  *               Copyright 2004-2006 Analog Devices Inc.
  13  *
  14  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, see the file COPYING, or write
  28  * to the Free Software Foundation, Inc.,
  29  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  30  */
  31
  32 /* NOTE: This code handles signal-recognition, which happens every time
  33  * after a timer-interrupt and after each system call.
  34  */
  35
  36 #include <linux/init.h>
  37 #include <linux/linkage.h>
  38 #include <linux/unistd.h>
  39 #include <asm/blackfin.h>
  40 #include <asm/errno.h>
  41 #include <asm/fixed_code.h>
  42 #include <asm/thread_info.h>  /* TIF_NEED_RESCHED */
  43 #include <asm/asm-offsets.h>
  44 #include <asm/trace.h>
  45 #include <asm/traps.h>
  46
  47 #include <asm/context.S>
  48
  49 #if defined(CONFIG_BFIN_SCRATCH_REG_RETN)
  50 # define EX_SCRATCH_REG RETN
  51 #elif defined(CONFIG_BFIN_SCRATCH_REG_RETE)
  52 # define EX_SCRATCH_REG RETE
  53 #else
  54 # define EX_SCRATCH_REG CYCLES
  55 #endif
  56
  57 #ifdef CONFIG_EXCPT_IRQ_SYSC_L1
  58 .section .l1.text
  59 #else
  60 .text
  61 #endif
  62
  63 /* Slightly simplified and streamlined entry point for CPLB misses.
  64  * This one does not lower the level to IRQ5, and thus can be used to
  65  * patch up CPLB misses on the kernel stack.
  66  */
  67 #if ANOMALY_05000261
  68 #define _ex_dviol _ex_workaround_261
  69 #define _ex_dmiss _ex_workaround_261
  70 #define _ex_dmult _ex_workaround_261
  71
  72 ENTRY(_ex_workaround_261)
  73         /*
  74          * Work around an anomaly: if we see a new DCPLB fault, return
  75          * without doing anything.  Then, if we get the same fault again,
  76          * handle it.
  77          */
  78         P4 = R7;        /* Store EXCAUSE */
  79
  80         GET_PDA(p5, r7);
  81         r7 = [p5 + PDA_LFRETX];
  82         r6 = retx;
  83         [p5 + PDA_LFRETX] = r6;
  84         cc = r6 == r7;
  85         if !cc jump _bfin_return_from_exception;
  86         /* fall through */
  87         R7 = P4;
  88         R6 = VEC_CPLB_M;        /* Data CPLB Miss */
  89         cc = R6 == R7;
  90         if cc jump _ex_dcplb_miss (BP);
  91 #ifdef CONFIG_MPU
  92         R6 = VEC_CPLB_VL;       /* Data CPLB Violation */
  93         cc = R6 == R7;
  94         if cc jump _ex_dcplb_viol (BP);
  95 #endif
  96         /* Handle Data CPLB Protection Violation
  97          * and Data CPLB Multiple Hits - Linux Trap Zero
  98          */
  99         jump _ex_trap_c;
 100 ENDPROC(_ex_workaround_261)
 101
 102 #else
 103 #ifdef CONFIG_MPU
 104 #define _ex_dviol _ex_dcplb_viol
 105 #else
 106 #define _ex_dviol _ex_trap_c
 107 #endif
 108 #define _ex_dmiss _ex_dcplb_miss
 109 #define _ex_dmult _ex_trap_c
 110 #endif
 111
 112
 113 ENTRY(_ex_dcplb_viol)
 114 ENTRY(_ex_dcplb_miss)
 115 ENTRY(_ex_icplb_miss)
 116         (R7:6,P5:4) = [sp++];
 117         /* We leave the previously pushed ASTAT on the stack.  */
 118         SAVE_CONTEXT_CPLB
 119
 120         /* We must load R1 here, _before_ DEBUG_HWTRACE_SAVE, since that
 121          * will change the stack pointer.  */
 122         R0 = SEQSTAT;
 123         R1 = SP;
 124
 125         DEBUG_HWTRACE_SAVE(p5, r7)
 126
 127         sp += -12;
 128         call _cplb_hdr;
 129         sp += 12;
 130         CC = R0 == 0;
 131         IF !CC JUMP _handle_bad_cplb;
 132
 133 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 134         /* While we were processing this, did we double fault? */
 135         r7 = SEQSTAT;           /* reason code is in bit 5:0 */
 136         r6.l = lo(SEQSTAT_EXCAUSE);
 137         r6.h = hi(SEQSTAT_EXCAUSE);
 138         r7 = r7 & r6;
 139         r6 = 0x25;
 140         CC = R7 == R6;
 141         if CC JUMP _double_fault;
 142 #endif
 143
 144         DEBUG_HWTRACE_RESTORE(p5, r7)
 145         RESTORE_CONTEXT_CPLB
 146         ASTAT = [SP++];
 147         SP = EX_SCRATCH_REG;
 148         rtx;
 149 ENDPROC(_ex_icplb_miss)
 150
 151 ENTRY(_ex_syscall)
 152         raise 15;               /* invoked by TRAP #0, for sys call */
 153         jump.s _bfin_return_from_exception;
 154 ENDPROC(_ex_syscall)
 155
 156 ENTRY(_ex_single_step)
 157         /* If we just returned from an interrupt, the single step event is
 158            for the RTI instruction.  */
 159         r7 = retx;
 160         r6 = reti;
 161         cc = r7 == r6;
 162         if cc jump _bfin_return_from_exception;
 163
 164 #ifdef CONFIG_KGDB
 165         /* Don't do single step in hardware exception handler */
 166         p5.l = lo(IPEND);
 167         p5.h = hi(IPEND);
 168         r6 = [p5];
 169         cc = bittst(r6, 4);
 170         if cc jump _bfin_return_from_exception;
 171         cc = bittst(r6, 5);
 172         if cc jump _bfin_return_from_exception;
 173
 174         /* skip single step if current interrupt priority is higher than
 175          * that of the first instruction, from which gdb starts single step */
 176         r6 >>= 6;
 177         r7 = 10;
 178 .Lfind_priority_start:
 179         cc = bittst(r6, 0);
 180         if cc jump .Lfind_priority_done;
 181         r6 >>= 1;
 182         r7 += -1;
 183         cc = r7 == 0;
 184         if cc jump .Lfind_priority_done;
 185         jump.s .Lfind_priority_start;
 186 .Lfind_priority_done:
 187         p4.l = _kgdb_single_step;
 188         p4.h = _kgdb_single_step;
 189         r6 = [p4];
 190         cc = r6 == 0;
 191         if cc jump .Ldo_single_step;
 192         r6 += -1;
 193         cc = r6 < r7;
 194         if cc jump 1f;
 195 .Ldo_single_step:
 196 #else
 197         /* If we were in user mode, do the single step normally.  */
 198         p5.l = lo(IPEND);
 199         p5.h = hi(IPEND);
 200         r6 = [p5];
 201         r7 = 0xffe0 (z);
 202         r7 = r7 & r6;
 203         cc = r7 == 0;
 204         if !cc jump 1f;
 205 #endif
 206 #ifdef CONFIG_EXACT_HWERR
 207         /* Read the ILAT, and to check to see if the process we are
 208          * single stepping caused a previous hardware error
 209          * If so, do not single step, (which lowers to IRQ5, and makes
 210          * us miss the error).
 211          */
 212         p5.l = lo(ILAT);
 213         p5.h = hi(ILAT);
 214         r7 = [p5];
 215         cc = bittst(r7, EVT_IVHW_P);
 216         if cc jump 1f;
 217 #endif
 218         /* Single stepping only a single instruction, so clear the trace
 219          * bit here.  */
 220         r7 = syscfg;
 221         bitclr (r7, SYSCFG_SSSTEP_P);
 222         syscfg = R7;
 223         jump _ex_trap_c;
 224
 225 1:
 226         /*
 227          * We were in an interrupt handler.  By convention, all of them save
 228          * SYSCFG with their first instruction, so by checking whether our
 229          * RETX points at the entry point, we can determine whether to allow
 230          * a single step, or whether to clear SYSCFG.
 231          *
 232          * First, find out the interrupt level and the event vector for it.
 233          */
 234         p5.l = lo(EVT0);
 235         p5.h = hi(EVT0);
 236         p5 += -4;
 237 2:
 238         r7 = rot r7 by -1;
 239         p5 += 4;
 240         if !cc jump 2b;
 241
 242         /* What we actually do is test for the _second_ instruction in the
 243          * IRQ handler.  That way, if there are insns following the restore
 244          * of SYSCFG after leaving the handler, we will not turn off SYSCFG
 245          * for them.  */
 246
 247         r7 = [p5];
 248         r7 += 2;
 249         r6 = RETX;
 250         cc = R7 == R6;
 251         if !cc jump _bfin_return_from_exception;
 252
 253         r7 = syscfg;
 254         bitclr (r7, SYSCFG_SSSTEP_P);   /* Turn off single step */
 255         syscfg = R7;
 256
 257         /* Fall through to _bfin_return_from_exception.  */
 258 ENDPROC(_ex_single_step)
 259
 260 ENTRY(_bfin_return_from_exception)
 261 #if ANOMALY_05000257
 262         R7=LC0;
 263         LC0=R7;
 264         R7=LC1;
 265         LC1=R7;
 266 #endif
 267
 268 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 269         /* While we were processing the current exception,
 270          * did we cause another, and double fault?
 271          */
 272         r7 = SEQSTAT;           /* reason code is in bit 5:0 */
 273         r6.l = lo(SEQSTAT_EXCAUSE);
 274         r6.h = hi(SEQSTAT_EXCAUSE);
 275         r7 = r7 & r6;
 276         r6 = VEC_UNCOV;
 277         CC = R7 == R6;
 278         if CC JUMP _double_fault;
 279 #endif
 280
 281         (R7:6,P5:4) = [sp++];
 282         ASTAT = [sp++];
 283         sp = EX_SCRATCH_REG;
 284         rtx;
 285 ENDPROC(_bfin_return_from_exception)
 286
 287 ENTRY(_handle_bad_cplb)
 288         DEBUG_HWTRACE_RESTORE(p5, r7)
 289         /* To get here, we just tried and failed to change a CPLB
 290          * so, handle things in trap_c (C code), by lowering to
 291          * IRQ5, just like we normally do. Since this is not a
 292          * "normal" return path, we have a do alot of stuff to
 293          * the stack to get ready so, we can fall through - we
 294          * need to make a CPLB exception look like a normal exception
 295          */
 296         RESTORE_CONTEXT_CPLB
 297         /* ASTAT is still on the stack, where it is needed.  */
 298         [--sp] = (R7:6,P5:4);
 299
 300 ENTRY(_ex_replaceable)
 301         nop;
 302
 303 ENTRY(_ex_trap_c)
 304         /* The only thing that has been saved in this context is
 305          * (R7:6,P5:4), ASTAT & SP - don't use anything else
 306          */
 307
 308         GET_PDA(p5, r6);
 309
 310         /* Make sure we are not in a double fault */
 311         p4.l = lo(IPEND);
 312         p4.h = hi(IPEND);
 313         r7 = [p4];
 314         CC = BITTST (r7, 5);
 315         if CC jump _double_fault;
 316         [p5 + PDA_EXIPEND] = r7;
 317
 318         /* Call C code (trap_c) to handle the exception, which most
 319          * likely involves sending a signal to the current process.
 320          * To avoid double faults, lower our priority to IRQ5 first.
 321          */
 322         r7.h = _exception_to_level5;
 323         r7.l = _exception_to_level5;
 324         p4.l = lo(EVT5);
 325         p4.h = hi(EVT5);
 326         [p4] = r7;
 327         csync;
 328
 329         /*
 330          * Save these registers, as they are only valid in exception context
 331          *  (where we are now - as soon as we defer to IRQ5, they can change)
 332          * DCPLB_STATUS and ICPLB_STATUS are also only valid in EVT3,
 333          * but they are not very interesting, so don't save them
 334          */
 335
 336         p4.l = lo(DCPLB_FAULT_ADDR);
 337         p4.h = hi(DCPLB_FAULT_ADDR);
 338         r7 = [p4];
 339         [p5 + PDA_DCPLB] = r7;
 340
 341         p4.l = lo(ICPLB_FAULT_ADDR);
 342         p4.h = hi(ICPLB_FAULT_ADDR);
 343         r6 = [p4];
 344         [p5 + PDA_ICPLB] = r6;
 345
 346         r6 = retx;
 347         [p5 + PDA_RETX] = r6;
 348
 349         r6 = SEQSTAT;
 350         [p5 + PDA_SEQSTAT] = r6;
 351
 352         /* Save the state of single stepping */
 353         r6 = SYSCFG;
 354         [p5 + PDA_SYSCFG] = r6;
 355         /* Clear it while we handle the exception in IRQ5 mode */
 356         BITCLR(r6, SYSCFG_SSSTEP_P);
 357         SYSCFG = r6;
 358
 359         /* Save the current IMASK, since we change in order to jump to level 5 */
 360         cli r6;
 361         [p5 + PDA_EXIMASK] = r6;
 362
 363         p4.l = lo(SAFE_USER_INSTRUCTION);
 364         p4.h = hi(SAFE_USER_INSTRUCTION);
 365         retx = p4;
 366
 367         /* Disable all interrupts, but make sure level 5 is enabled so
 368          * we can switch to that level.
 369          */
 370         r6 = 0x3f;
 371         sti r6;
 372
 373         /* In case interrupts are disabled IPEND[4] (global interrupt disable bit)
 374          * clear it (re-enabling interrupts again) by the special sequence of pushing
 375          * RETI onto the stack.  This way we can lower ourselves to IVG5 even if the
 376          * exception was taken after the interrupt handler was called but before it
 377          * got a chance to enable global interrupts itself.
 378          */
 379         [--sp] = reti;
 380         sp += 4;
 381
 382         raise 5;
 383         jump.s _bfin_return_from_exception;
 384 ENDPROC(_ex_trap_c)
 385
 386 /* We just realized we got an exception, while we were processing a different
 387  * exception. This is a unrecoverable event, so crash.
 388  * Note: this cannot be ENTRY() as we jump here with "if cc jump" ...
 389  */
 390 ENTRY(_double_fault)
 391         /* Turn caches & protection off, to ensure we don't get any more
 392          * double exceptions
 393          */
 394
 395         P4.L = LO(IMEM_CONTROL);
 396         P4.H = HI(IMEM_CONTROL);
 397
 398         R5 = [P4];              /* Control Register*/
 399         BITCLR(R5,ENICPLB_P);
 400         CSYNC;          /* Disabling of CPLBs should be proceeded by a CSYNC */
 401         [P4] = R5;
 402         SSYNC;
 403
 404         P4.L = LO(DMEM_CONTROL);
 405         P4.H = HI(DMEM_CONTROL);
 406         R5 = [P4];
 407         BITCLR(R5,ENDCPLB_P);
 408         CSYNC;          /* Disabling of CPLBs should be proceeded by a CSYNC */
 409         [P4] = R5;
 410         SSYNC;
 411
 412         /* Fix up the stack */
 413         (R7:6,P5:4) = [sp++];
 414         ASTAT = [sp++];
 415         SP = EX_SCRATCH_REG;
 416
 417         /* We should be out of the exception stack, and back down into
 418          * kernel or user space stack
 419          */
 420         SAVE_ALL_SYS
 421
 422         /* The dumping functions expect the return address in the RETI
 423          * slot.  */
 424         r6 = retx;
 425         [sp + PT_PC] = r6;
 426
 427         r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
 428         SP += -12;
 429         call _double_fault_c;
 430         SP += 12;
 431 .L_double_fault_panic:
 432         JUMP .L_double_fault_panic
 433
 434 ENDPROC(_double_fault)
 435
 436 ENTRY(_exception_to_level5)
 437         SAVE_ALL_SYS
 438
 439         GET_PDA(p5, r7);        /* Fetch current PDA */
 440         r6 = [p5 + PDA_RETX];
 441         [sp + PT_PC] = r6;
 442
 443         r6 = [p5 + PDA_SYSCFG];
 444         [sp + PT_SYSCFG] = r6;
 445
 446         r6 = [p5 + PDA_SEQSTAT]; /* Read back seqstat */
 447         [sp + PT_SEQSTAT] = r6;
 448
 449         /* Restore the hardware error vector.  */
 450         r7.h = _evt_ivhw;
 451         r7.l = _evt_ivhw;
 452         p4.l = lo(EVT5);
 453         p4.h = hi(EVT5);
 454         [p4] = r7;
 455         csync;
 456
 457 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 458         /* Now that we have the hardware error vector programmed properly
 459          * we can re-enable interrupts (IPEND[4]), so if the _trap_c causes
 460          * another hardware error, we can catch it (self-nesting).
 461          */
 462         [--sp] = reti;
 463         sp += 4;
 464 #endif
 465
 466         r7 = [p5 + PDA_EXIPEND] /* Read the IPEND from the Exception state */
 467         [sp + PT_IPEND] = r7;   /* Store IPEND onto the stack */
 468
 469         r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
 470         SP += -12;
 471         call _trap_c;
 472         SP += 12;
 473
 474         /* If interrupts were off during the exception (IPEND[4] = 1), turn them off
 475          * before we return.
 476          */
 477         CC = BITTST(r7, EVT_IRPTEN_P)
 478         if !CC jump 1f;
 479         /* this will load a random value into the reti register - but that is OK,
 480          * since we do restore it to the correct value in the 'RESTORE_ALL_SYS' macro
 481          */
 482         sp += -4;
 483         reti = [sp++];
 484 1:
 485         /* restore the interrupt mask (IMASK) */
 486         r6 = [p5 + PDA_EXIMASK];
 487         sti r6;
 488
 489         call _ret_from_exception;
 490         RESTORE_ALL_SYS
 491         rti;
 492 ENDPROC(_exception_to_level5)
 493
 494 ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
 495         /* Since the kernel stack can be anywhere, it's not guaranteed to be
 496          * covered by a CPLB.  Switch to an exception stack; use RETN as a
 497          * scratch register (for want of a better option).
 498          */
 499         EX_SCRATCH_REG = sp;
 500         GET_PDA_SAFE(sp);
 501         sp = [sp + PDA_EXSTACK];
 502         /* Try to deal with syscalls quickly.  */
 503         [--sp] = ASTAT;
 504         [--sp] = (R7:6,P5:4);
 505
 506 #ifdef CONFIG_EXACT_HWERR
 507         /* Make sure all pending read/writes complete. This will ensure any
 508          * accesses which could cause hardware errors completes, and signal
 509          * the the hardware before we do something silly, like crash the
 510          * kernel. We don't need to work around anomaly 05000312, since
 511          * we are already atomic
 512          */
 513         ssync;
 514 #endif
 515
 516         ANOMALY_283_315_WORKAROUND(p5, r7)
 517
 518 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 519         /*
 520          * Save these registers, as they are only valid in exception context
 521          * (where we are now - as soon as we defer to IRQ5, they can change)
 522          * DCPLB_STATUS and ICPLB_STATUS are also only valid in EVT3,
 523          * but they are not very interesting, so don't save them
 524          */
 525
 526         GET_PDA(p5, r7);
 527         p4.l = lo(DCPLB_FAULT_ADDR);
 528         p4.h = hi(DCPLB_FAULT_ADDR);
 529         r7 = [p4];
 530         [p5 + PDA_DF_DCPLB] = r7;
 531
 532         p4.l = lo(ICPLB_FAULT_ADDR);
 533         p4.h = hi(ICPLB_FAULT_ADDR);
 534         r7 = [p4];
 535         [p5 + PDA_DF_ICPLB] = r7;
 536
 537         r7 = retx;
 538         [p5 + PDA_DF_RETX] = r7;
 539
 540         r7 = SEQSTAT;           /* reason code is in bit 5:0 */
 541         [p5 + PDA_DF_SEQSTAT] = r7;
 542 #else
 543         r7 = SEQSTAT;           /* reason code is in bit 5:0 */
 544 #endif
 545         r6.l = lo(SEQSTAT_EXCAUSE);
 546         r6.h = hi(SEQSTAT_EXCAUSE);
 547         r7 = r7 & r6;
 548         p5.h = _ex_table;
 549         p5.l = _ex_table;
 550         p4 = r7;
 551         p5 = p5 + (p4 << 2);
 552         p4 = [p5];
 553         jump (p4);
 554
 555 .Lbadsys:
 556         r7 = -ENOSYS;           /* signextending enough */
 557         [sp + PT_R0] = r7;      /* return value from system call */
 558         jump .Lsyscall_really_exit;
 559 ENDPROC(_trap)
 560
 561 ENTRY(_kernel_execve)
 562         link SIZEOF_PTREGS;
 563         p0 = sp;
 564         r3 = SIZEOF_PTREGS / 4;
 565         r4 = 0(x);
 566 .Lclear_regs:
 567         [p0++] = r4;
 568         r3 += -1;
 569         cc = r3 == 0;
 570         if !cc jump .Lclear_regs (bp);
 571
 572         p0 = sp;
 573         sp += -16;
 574         [sp + 12] = p0;
 575         call _do_execve;
 576         SP += 16;
 577         cc = r0 == 0;
 578         if ! cc jump .Lexecve_failed;
 579         /* Success.  Copy our temporary pt_regs to the top of the kernel
 580          * stack and do a normal exception return.
 581          */
 582         r1 = sp;
 583         r0 = (-KERNEL_STACK_SIZE) (x);
 584         r1 = r1 & r0;
 585         p2 = r1;
 586         p3 = [p2];
 587         r0 = KERNEL_STACK_SIZE - 4 (z);
 588         p1 = r0;
 589         p1 = p1 + p2;
 590
 591         p0 = fp;
 592         r4 = [p0--];
 593         r3 = SIZEOF_PTREGS / 4;
 594 .Lcopy_regs:
 595         r4 = [p0--];
 596         [p1--] = r4;
 597         r3 += -1;
 598         cc = r3 == 0;
 599         if ! cc jump .Lcopy_regs (bp);
 600
 601         r0 = (KERNEL_STACK_SIZE - SIZEOF_PTREGS) (z);
 602         p1 = r0;
 603         p1 = p1 + p2;
 604         sp = p1;
 605         r0 = syscfg;
 606         [SP + PT_SYSCFG] = r0;
 607         [p3 + (TASK_THREAD + THREAD_KSP)] = sp;
 608
 609         RESTORE_CONTEXT;
 610         rti;
 611 .Lexecve_failed:
 612         unlink;
 613         rts;
 614 ENDPROC(_kernel_execve)
 615
 616 ENTRY(_system_call)
 617         /* Store IPEND */
 618         p2.l = lo(IPEND);
 619         p2.h = hi(IPEND);
 620         csync;
 621         r0 = [p2];
 622         [sp + PT_IPEND] = r0;
 623
 624         /* Store RETS for now */
 625         r0 = rets;
 626         [sp + PT_RESERVED] = r0;
 627         /* Set the stack for the current process */
 628         r7 = sp;
 629         r6.l = lo(ALIGN_PAGE_MASK);
 630         r6.h = hi(ALIGN_PAGE_MASK);
 631         r7 = r7 & r6;           /* thread_info */
 632         p2 = r7;
 633         p2 = [p2];
 634
 635         [p2+(TASK_THREAD+THREAD_KSP)] = sp;
 636 #ifdef CONFIG_IPIPE
 637         r0 = sp;
 638         SP += -12;
 639         call ___ipipe_syscall_root;
 640         SP += 12;
 641         cc = r0 == 1;
 642         if cc jump .Lsyscall_really_exit;
 643         cc = r0 == -1;
 644         if cc jump .Lresume_userspace;
 645         r3 = [sp + PT_R3];
 646         r4 = [sp + PT_R4];
 647         p0 = [sp + PT_ORIG_P0];
 648 #endif /* CONFIG_IPIPE */
 649
 650         /* Check the System Call */
 651         r7 = __NR_syscall;
 652         /* System call number is passed in P0 */
 653         r6 = p0;
 654         cc = r6 < r7;
 655         if ! cc jump .Lbadsys;
 656
 657         /* are we tracing syscalls?*/
 658         r7 = sp;
 659         r6.l = lo(ALIGN_PAGE_MASK);
 660         r6.h = hi(ALIGN_PAGE_MASK);
 661         r7 = r7 & r6;
 662         p2 = r7;
 663         r7 = [p2+TI_FLAGS];
 664         CC = BITTST(r7,TIF_SYSCALL_TRACE);
 665         if CC JUMP _sys_trace;
 666
 667         /* Execute the appropriate system call */
 668
 669         p4 = p0;
 670         p5.l = _sys_call_table;
 671         p5.h = _sys_call_table;
 672         p5 = p5 + (p4 << 2);
 673         r0 = [sp + PT_R0];
 674         r1 = [sp + PT_R1];
 675         r2 = [sp + PT_R2];
 676         p5 = [p5];
 677
 678         [--sp] = r5;
 679         [--sp] = r4;
 680         [--sp] = r3;
 681         SP += -12;
 682         call (p5);
 683         SP += 24;
 684         [sp + PT_R0] = r0;
 685
 686 .Lresume_userspace:
 687         r7 = sp;
 688         r4.l = lo(ALIGN_PAGE_MASK);
 689         r4.h = hi(ALIGN_PAGE_MASK);
 690         r7 = r7 & r4;           /* thread_info->flags */
 691         p5 = r7;
 692 .Lresume_userspace_1:
 693         /* Disable interrupts.  */
 694         [--sp] = reti;
 695         reti = [sp++];
 696
 697         r7 = [p5 + TI_FLAGS];
 698         r4.l = lo(_TIF_WORK_MASK);
 699         r4.h = hi(_TIF_WORK_MASK);
 700         r7 =  r7 & r4;
 701
 702 .Lsyscall_resched:
 703 #ifdef CONFIG_IPIPE
 704         cc = BITTST(r7, TIF_IRQ_SYNC);
 705         if !cc jump .Lsyscall_no_irqsync;
 706         /*
 707          * Clear IPEND[4] manually to undo what resume_userspace_1 just did;
 708          * we need this so that high priority domain interrupts may still
 709          * preempt the current domain while the pipeline log is being played
 710          * back.
 711          */
 712         [--sp] = reti;
 713         SP += 4; /* don't merge with next insn to keep the pattern obvious */
 714         SP += -12;
 715         call ___ipipe_sync_root;
 716         SP += 12;
 717         jump .Lresume_userspace_1;
 718 .Lsyscall_no_irqsync:
 719 #endif
 720         cc = BITTST(r7, TIF_NEED_RESCHED);
 721         if !cc jump .Lsyscall_sigpending;
 722
 723         /* Reenable interrupts.  */
 724         [--sp] = reti;
 725         sp += 4;
 726
 727         SP += -12;
 728         call _schedule;
 729         SP += 12;
 730
 731         jump .Lresume_userspace_1;
 732
 733 .Lsyscall_sigpending:
 734         cc = BITTST(r7, TIF_RESTORE_SIGMASK);
 735         if cc jump .Lsyscall_do_signals;
 736         cc = BITTST(r7, TIF_SIGPENDING);
 737         if !cc jump .Lsyscall_really_exit;
 738 .Lsyscall_do_signals:
 739         /* Reenable interrupts.  */
 740         [--sp] = reti;
 741         sp += 4;
 742
 743         r0 = sp;
 744         SP += -12;
 745         call _do_signal;
 746         SP += 12;
 747
 748 .Lsyscall_really_exit:
 749         r5 = [sp + PT_RESERVED];
 750         rets = r5;
 751         rts;
 752 ENDPROC(_system_call)
 753
 754 /* Do not mark as ENTRY() to avoid error in assembler ...
 755  * this symbol need not be global anyways, so ...
 756  */
 757 _sys_trace:
 758         call _syscall_trace;
 759
 760         /* Execute the appropriate system call */
 761
 762         p4 = [SP + PT_P0];
 763         p5.l = _sys_call_table;
 764         p5.h = _sys_call_table;
 765         p5 = p5 + (p4 << 2);
 766         r0 = [sp + PT_R0];
 767         r1 = [sp + PT_R1];
 768         r2 = [sp + PT_R2];
 769         r3 = [sp + PT_R3];
 770         r4 = [sp + PT_R4];
 771         r5 = [sp + PT_R5];
 772         p5 = [p5];
 773
 774         [--sp] = r5;
 775         [--sp] = r4;
 776         [--sp] = r3;
 777         SP += -12;
 778         call (p5);
 779         SP += 24;
 780         [sp + PT_R0] = r0;
 781
 782         call _syscall_trace;
 783         jump .Lresume_userspace;
 784 ENDPROC(_sys_trace)
 785
 786 ENTRY(_resume)
 787         /*
 788          * Beware - when entering resume, prev (the current task) is
 789          * in r0, next (the new task) is in r1.
 790          */
 791         p0 = r0;
 792         p1 = r1;
 793         [--sp] = rets;
 794         [--sp] = fp;
 795         [--sp] = (r7:4, p5:3);
 796
 797         /* save usp */
 798         p2 = usp;
 799         [p0+(TASK_THREAD+THREAD_USP)] = p2;
 800
 801         /* save current kernel stack pointer */
 802         [p0+(TASK_THREAD+THREAD_KSP)] = sp;
 803
 804         /* save program counter */
 805         r1.l = _new_old_task;
 806         r1.h = _new_old_task;
 807         [p0+(TASK_THREAD+THREAD_PC)] = r1;
 808
 809         /* restore the kernel stack pointer */
 810         sp = [p1+(TASK_THREAD+THREAD_KSP)];
 811
 812         /* restore user stack pointer */
 813         p0 = [p1+(TASK_THREAD+THREAD_USP)];
 814         usp = p0;
 815
 816         /* restore pc */
 817         p0 = [p1+(TASK_THREAD+THREAD_PC)];
 818         jump (p0);
 819
 820         /*
 821          * Following code actually lands up in a new (old) task.
 822          */
 823
 824 _new_old_task:
 825         (r7:4, p5:3) = [sp++];
 826         fp = [sp++];
 827         rets = [sp++];
 828
 829         /*
 830          * When we come out of resume, r0 carries "old" task, becuase we are
 831          * in "new" task.
 832          */
 833         rts;
 834 ENDPROC(_resume)
 835
 836 ENTRY(_ret_from_exception)
 837 #ifdef CONFIG_IPIPE
 838         p2.l = _per_cpu__ipipe_percpu_domain;
 839         p2.h = _per_cpu__ipipe_percpu_domain;
 840         r0.l = _ipipe_root;
 841         r0.h = _ipipe_root;
 842         r2 = [p2];
 843         cc = r0 == r2;
 844         if !cc jump 4f;  /* not on behalf of the root domain, get out */
 845 #endif /* CONFIG_IPIPE */
 846         p2.l = lo(IPEND);
 847         p2.h = hi(IPEND);
 848
 849         csync;
 850         r0 = [p2];
 851         [sp + PT_IPEND] = r0;
 852
 853 1:
 854         r2 = LO(~0x37) (Z);
 855         r0 = r2 & r0;
 856         cc = r0 == 0;
 857         if !cc jump 4f; /* if not return to user mode, get out */
 858
 859         /* Make sure any pending system call or deferred exception
 860          * return in ILAT for this process to get executed, otherwise
 861          * in case context switch happens, system call of
 862          * first process (i.e in ILAT) will be carried
 863          * forward to the switched process
 864          */
 865
 866         p2.l = lo(ILAT);
 867         p2.h = hi(ILAT);
 868         r0 = [p2];
 869         r1 = (EVT_IVG14 | EVT_IVG15) (z);
 870         r0 = r0 & r1;
 871         cc = r0 == 0;
 872         if !cc jump 5f;
 873
 874         /* Set the stack for the current process */
 875         r7 = sp;
 876         r4.l = lo(ALIGN_PAGE_MASK);
 877         r4.h = hi(ALIGN_PAGE_MASK);
 878         r7 = r7 & r4;           /* thread_info->flags */
 879         p5 = r7;
 880         r7 = [p5 + TI_FLAGS];
 881         r4.l = lo(_TIF_WORK_MASK);
 882         r4.h = hi(_TIF_WORK_MASK);
 883         r7 =  r7 & r4;
 884         cc = r7 == 0;
 885         if cc jump 4f;
 886
 887         p0.l = lo(EVT15);
 888         p0.h = hi(EVT15);
 889         p1.l = _schedule_and_signal;
 890         p1.h = _schedule_and_signal;
 891         [p0] = p1;
 892         csync;
 893         raise 15;               /* raise evt15 to do signal or reschedule */
 894 4:
 895         r0 = syscfg;
 896         bitclr(r0, SYSCFG_SSSTEP_P);            /* Turn off single step */
 897         syscfg = r0;
 898 5:
 899         rts;
 900 ENDPROC(_ret_from_exception)
 901
 902 #ifdef CONFIG_IPIPE
 903
 904 _resume_kernel_from_int:
 905         r0.l = ___ipipe_sync_root;
 906         r0.h = ___ipipe_sync_root;
 907         [--sp] = rets;
 908         [--sp] = ( r7:4, p5:3 );
 909         SP += -12;
 910         call ___ipipe_call_irqtail
 911         SP += 12;
 912         ( r7:4, p5:3 ) = [sp++];
 913         rets = [sp++];
 914         rts
 915 #else
 916 #define _resume_kernel_from_int  2f
 917 #endif
 918
 919 ENTRY(_return_from_int)
 920         /* If someone else already raised IRQ 15, do nothing.  */
 921         csync;
 922         p2.l = lo(ILAT);
 923         p2.h = hi(ILAT);
 924         r0 = [p2];
 925         cc = bittst (r0, EVT_IVG15_P);
 926         if cc jump 2f;
 927
 928         /* if not return to user mode, get out */
 929         p2.l = lo(IPEND);
 930         p2.h = hi(IPEND);
 931         r0 = [p2];
 932         r1 = 0x17(Z);
 933         r2 = ~r1;
 934         r2.h = 0;
 935         r0 = r2 & r0;
 936         r1 = 1;
 937         r1 = r0 - r1;
 938         r2 = r0 & r1;
 939         cc = r2 == 0;
 940         if !cc jump _resume_kernel_from_int;
 941
 942         /* Lower the interrupt level to 15.  */
 943         p0.l = lo(EVT15);
 944         p0.h = hi(EVT15);
 945         p1.l = _schedule_and_signal_from_int;
 946         p1.h = _schedule_and_signal_from_int;
 947         [p0] = p1;
 948         csync;
 949 #if ANOMALY_05000281 || ANOMALY_05000461
 950         r0.l = lo(SAFE_USER_INSTRUCTION);
 951         r0.h = hi(SAFE_USER_INSTRUCTION);
 952         reti = r0;
 953 #endif
 954         r0 = 0x801f (z);
 955         STI r0;
 956         raise 15;       /* raise evt15 to do signal or reschedule */
 957         rti;
 958 2:
 959         rts;
 960 ENDPROC(_return_from_int)
 961
 962 ENTRY(_lower_to_irq14)
 963 #if ANOMALY_05000281 || ANOMALY_05000461
 964         r0.l = lo(SAFE_USER_INSTRUCTION);
 965         r0.h = hi(SAFE_USER_INSTRUCTION);
 966         reti = r0;
 967 #endif
 968
 969 #ifdef CONFIG_DEBUG_HWERR
 970         /* enable irq14 & hwerr interrupt, until we transition to _evt_evt14 */
 971         r0 = (EVT_IVG14 | EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
 972 #else
 973         /* Only enable irq14 interrupt, until we transition to _evt_evt14 */
 974         r0 = (EVT_IVG14 | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
 975 #endif
 976         sti r0;
 977         raise 14;
 978         rti;
 979 ENDPROC(_lower_to_irq14)
 980
 981 ENTRY(_evt_evt14)
 982 #ifdef CONFIG_DEBUG_HWERR
 983         r0 = (EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
 984         sti r0;
 985 #else
 986         cli r0;
 987 #endif
 988         [--sp] = RETI;
 989         SP += 4;
 990         rts;
 991 ENDPROC(_evt_evt14)
 992
 993 ENTRY(_schedule_and_signal_from_int)
 994         /* To end up here, vector 15 was changed - so we have to change it
 995          * back.
 996          */
 997         p0.l = lo(EVT15);
 998         p0.h = hi(EVT15);
 999         p1.l = _evt_system_call;
1000         p1.h = _evt_system_call;
1001         [p0] = p1;
1002         csync;
1003
1004         /* Set orig_p0 to -1 to indicate this isn't the end of a syscall.  */
1005         r0 = -1 (x);
1006         [sp + PT_ORIG_P0] = r0;
1007
1008         p1 = rets;
1009         [sp + PT_RESERVED] = p1;
1010
1011 #ifdef CONFIG_SMP
1012         GET_PDA(p0, r0);        /* Fetch current PDA (can't migrate to other CPU here) */
1013         r0 = [p0 + PDA_IRQFLAGS];
1014 #else
1015         p0.l = _bfin_irq_flags;
1016         p0.h = _bfin_irq_flags;
1017         r0 = [p0];
1018 #endif
1019         sti r0;
1020
1021         /* finish the userspace "atomic" functions for it */
1022         r1 = FIXED_CODE_END;
1023         r2 = [sp + PT_PC];
1024         cc = r1 <= r2;
1025         if cc jump .Lresume_userspace (bp);
1026
1027         r0 = sp;
1028         sp += -12;
1029         call _finish_atomic_sections;
1030         sp += 12;
1031         jump.s .Lresume_userspace;
1032 ENDPROC(_schedule_and_signal_from_int)
1033
1034 ENTRY(_schedule_and_signal)
1035         SAVE_CONTEXT_SYSCALL
1036         /* To end up here, vector 15 was changed - so we have to change it
1037          * back.
1038          */
1039         p0.l = lo(EVT15);
1040         p0.h = hi(EVT15);
1041         p1.l = _evt_system_call;
1042         p1.h = _evt_system_call;
1043         [p0] = p1;
1044         csync;
1045         p0.l = 1f;
1046         p0.h = 1f;
1047         [sp + PT_RESERVED] = P0;
1048         call .Lresume_userspace;
1049 1:
1050         RESTORE_CONTEXT
1051         rti;
1052 ENDPROC(_schedule_and_signal)
1053
1054 /* We handle this 100% in exception space - to reduce overhead
1055  * Only potiential problem is if the software buffer gets swapped out of the
1056  * CPLB table - then double fault. - so we don't let this happen in other places
1057  */
1058 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
1059 ENTRY(_ex_trace_buff_full)
1060         [--sp] = P3;
1061         [--sp] = P2;
1062         [--sp] = LC0;
1063         [--sp] = LT0;
1064         [--sp] = LB0;
1065         P5.L = _trace_buff_offset;
1066         P5.H = _trace_buff_offset;
1067         P3 = [P5];              /* trace_buff_offset */
1068         P5.L = lo(TBUFSTAT);
1069         P5.H = hi(TBUFSTAT);
1070         R7 = [P5];
1071         R7 <<= 1;               /* double, since we need to read twice */
1072         LC0 = R7;
1073         R7 <<= 2;               /* need to shift over again,
1074                                  * to get the number of bytes */
1075         P5.L = lo(TBUF);
1076         P5.H = hi(TBUF);
1077         R6 = ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*1024) - 1;
1078
1079         P2 = R7;
1080         P3 = P3 + P2;
1081         R7 = P3;
1082         R7 = R7 & R6;
1083         P3 = R7;
1084         P2.L = _trace_buff_offset;
1085         P2.H = _trace_buff_offset;
1086         [P2] = P3;
1087
1088         P2.L = _software_trace_buff;
1089         P2.H = _software_trace_buff;
1090
1091         LSETUP (.Lstart, .Lend) LC0;
1092 .Lstart:
1093         R7 = [P5];      /* read TBUF */
1094         P4 = P3 + P2;
1095         [P4] = R7;
1096         P3 += -4;
1097         R7 = P3;
1098         R7 = R7 & R6;
1099 .Lend:
1100         P3 = R7;
1101
1102         LB0 = [sp++];
1103         LT0 = [sp++];
1104         LC0 = [sp++];
1105         P2 = [sp++];
1106         P3 = [sp++];
1107         jump _bfin_return_from_exception;
1108 ENDPROC(_ex_trace_buff_full)
1109
1110 #if CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN == 4
1111 .data
1112 #else
1113 .section .l1.data.B
1114 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN */
1115 ENTRY(_trace_buff_offset)
1116         .long 0;
1117 ALIGN
1118 ENTRY(_software_trace_buff)
1119         .rept ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*256);
1120         .long 0
1121         .endr
1122 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND */
1123
1124 #if CONFIG_EARLY_PRINTK
1125 __INIT
1126 ENTRY(_early_trap)
1127         SAVE_ALL_SYS
1128         trace_buffer_stop(p0,r0);
1129
1130         ANOMALY_283_315_WORKAROUND(p4, r5)
1131
1132         /* Turn caches off, to ensure we don't get double exceptions */
1133
1134         P4.L = LO(IMEM_CONTROL);
1135         P4.H = HI(IMEM_CONTROL);
1136
1137         R5 = [P4];              /* Control Register*/
1138         BITCLR(R5,ENICPLB_P);
1139         CSYNC;          /* Disabling of CPLBs should be proceeded by a CSYNC */
1140         [P4] = R5;
1141         SSYNC;
1142
1143         P4.L = LO(DMEM_CONTROL);
1144         P4.H = HI(DMEM_CONTROL);
1145         R5 = [P4];
1146         BITCLR(R5,ENDCPLB_P);
1147         CSYNC;          /* Disabling of CPLBs should be proceeded by a CSYNC */
1148         [P4] = R5;
1149         SSYNC;
1150
1151         r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
1152         r1 = RETX;
1153
1154         SP += -12;
1155         call _early_trap_c;
1156         SP += 12;
1157 ENDPROC(_early_trap)
1158 __FINIT
1159 #endif /* CONFIG_EARLY_PRINTK */
1160
1161 /*
1162  * Put these in the kernel data section - that should always be covered by
1163  * a CPLB. This is needed to ensure we don't get double fault conditions
1164  */
1165
1166 #ifdef CONFIG_SYSCALL_TAB_L1
1167 .section .l1.data
1168 #else
1169 .data
1170 #endif
1171
1172 ENTRY(_ex_table)
1173         /* entry for each EXCAUSE[5:0]
1174          * This table must be in sync with the table in ./kernel/traps.c
1175          * EXCPT instruction can provide 4 bits of EXCAUSE, allowing 16 to be user defined
1176          */
1177         .long _ex_syscall       /* 0x00 - User Defined - Linux Syscall */
1178         .long _ex_trap_c        /* 0x01 - User Defined - Software breakpoint */
1179 #ifdef  CONFIG_KGDB
1180         .long _ex_trap_c        /* 0x02 - User Defined - KGDB initial connection
1181                                                          and break signal trap */
1182 #else
1183         .long _ex_replaceable   /* 0x02 - User Defined */
1184 #endif
1185         .long _ex_trap_c        /* 0x03 - User Defined - userspace stack overflow */
1186         .long _ex_trap_c        /* 0x04 - User Defined - dump trace buffer */
1187         .long _ex_replaceable   /* 0x05 - User Defined */
1188         .long _ex_replaceable   /* 0x06 - User Defined */
1189         .long _ex_replaceable   /* 0x07 - User Defined */
1190         .long _ex_replaceable   /* 0x08 - User Defined */
1191         .long _ex_replaceable   /* 0x09 - User Defined */
1192         .long _ex_replaceable   /* 0x0A - User Defined */
1193         .long _ex_replaceable   /* 0x0B - User Defined */
1194         .long _ex_replaceable   /* 0x0C - User Defined */
1195         .long _ex_replaceable   /* 0x0D - User Defined */
1196         .long _ex_replaceable   /* 0x0E - User Defined */
1197         .long _ex_replaceable   /* 0x0F - User Defined */
1198         .long _ex_single_step   /* 0x10 - HW Single step */
1199 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
1200         .long _ex_trace_buff_full /* 0x11 - Trace Buffer Full */
1201 #else
1202         .long _ex_trap_c        /* 0x11 - Trace Buffer Full */
1203 #endif
1204         .long _ex_trap_c        /* 0x12 - Reserved */
1205         .long _ex_trap_c        /* 0x13 - Reserved */
1206         .long _ex_trap_c        /* 0x14 - Reserved */
1207         .long _ex_trap_c        /* 0x15 - Reserved */
1208         .long _ex_trap_c        /* 0x16 - Reserved */
1209         .long _ex_trap_c        /* 0x17 - Reserved */
1210         .long _ex_trap_c        /* 0x18 - Reserved */
1211         .long _ex_trap_c        /* 0x19 - Reserved */
1212         .long _ex_trap_c        /* 0x1A - Reserved */
1213         .long _ex_trap_c        /* 0x1B - Reserved */
1214         .long _ex_trap_c        /* 0x1C - Reserved */
1215         .long _ex_trap_c        /* 0x1D - Reserved */
1216         .long _ex_trap_c        /* 0x1E - Reserved */
1217         .long _ex_trap_c        /* 0x1F - Reserved */
1218         .long _ex_trap_c        /* 0x20 - Reserved */
1219         .long _ex_trap_c        /* 0x21 - Undefined Instruction */
1220         .long _ex_trap_c        /* 0x22 - Illegal Instruction Combination */
1221         .long _ex_dviol         /* 0x23 - Data CPLB Protection Violation */
1222         .long _ex_trap_c        /* 0x24 - Data access misaligned */
1223         .long _ex_trap_c        /* 0x25 - Unrecoverable Event */
1224         .long _ex_dmiss         /* 0x26 - Data CPLB Miss */
1225         .long _ex_dmult         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero */
1226         .long _ex_trap_c        /* 0x28 - Emulation Watchpoint */
1227         .long _ex_trap_c        /* 0x29 - Instruction fetch access error (535 only) */
1228         .long _ex_trap_c        /* 0x2A - Instruction fetch misaligned */
1229         .long _ex_trap_c        /* 0x2B - Instruction CPLB protection Violation */
1230         .long _ex_icplb_miss    /* 0x2C - Instruction CPLB miss */
1231         .long _ex_trap_c        /* 0x2D - Instruction CPLB Multiple Hits */
1232         .long _ex_trap_c        /* 0x2E - Illegal use of Supervisor Resource */
1233         .long _ex_trap_c        /* 0x2E - Illegal use of Supervisor Resource */
1234         .long _ex_trap_c        /* 0x2F - Reserved */
1235         .long _ex_trap_c        /* 0x30 - Reserved */
1236         .long _ex_trap_c        /* 0x31 - Reserved */
1237         .long _ex_trap_c        /* 0x32 - Reserved */
1238         .long _ex_trap_c        /* 0x33 - Reserved */
1239         .long _ex_trap_c        /* 0x34 - Reserved */
1240         .long _ex_trap_c        /* 0x35 - Reserved */
1241         .long _ex_trap_c        /* 0x36 - Reserved */
1242         .long _ex_trap_c        /* 0x37 - Reserved */
1243         .long _ex_trap_c        /* 0x38 - Reserved */
1244         .long _ex_trap_c        /* 0x39 - Reserved */
1245         .long _ex_trap_c        /* 0x3A - Reserved */
1246         .long _ex_trap_c        /* 0x3B - Reserved */
1247         .long _ex_trap_c        /* 0x3C - Reserved */
1248         .long _ex_trap_c        /* 0x3D - Reserved */
1249         .long _ex_trap_c        /* 0x3E - Reserved */
1250         .long _ex_trap_c        /* 0x3F - Reserved */
1251 END(_ex_table)
1252
1253 ENTRY(_sys_call_table)
1254         .long _sys_restart_syscall      /* 0 */
1255         .long _sys_exit
1256         .long _sys_fork
1257         .long _sys_read
1258         .long _sys_write
1259         .long _sys_open         /* 5 */
1260         .long _sys_close
1261         .long _sys_ni_syscall   /* old waitpid */
1262         .long _sys_creat
1263         .long _sys_link
1264         .long _sys_unlink       /* 10 */
1265         .long _sys_execve
1266         .long _sys_chdir
1267         .long _sys_time
1268         .long _sys_mknod
1269         .long _sys_chmod                /* 15 */
1270         .long _sys_chown        /* chown16 */
1271         .long _sys_ni_syscall   /* old break syscall holder */
1272         .long _sys_ni_syscall   /* old stat */
1273         .long _sys_lseek
1274         .long _sys_getpid       /* 20 */
1275         .long _sys_mount
1276         .long _sys_ni_syscall   /* old umount */
1277         .long _sys_setuid
1278         .long _sys_getuid
1279         .long _sys_stime                /* 25 */
1280         .long _sys_ptrace
1281         .long _sys_alarm
1282         .long _sys_ni_syscall   /* old fstat */
1283         .long _sys_pause
1284         .long _sys_ni_syscall   /* old utime */ /* 30 */
1285         .long _sys_ni_syscall   /* old stty syscall holder */
1286         .long _sys_ni_syscall   /* old gtty syscall holder */
1287         .long _sys_access
1288         .long _sys_nice
1289         .long _sys_ni_syscall   /* 35 */ /* old ftime syscall holder */
1290         .long _sys_sync
1291         .long _sys_kill
1292         .long _sys_rename
1293         .long _sys_mkdir
1294         .long _sys_rmdir                /* 40 */
1295         .long _sys_dup
1296         .long _sys_pipe
1297         .long _sys_times
1298         .long _sys_ni_syscall   /* old prof syscall holder */
1299         .long _sys_brk          /* 45 */
1300         .long _sys_setgid
1301         .long _sys_getgid
1302         .long _sys_ni_syscall   /* old sys_signal */
1303         .long _sys_geteuid      /* geteuid16 */
1304         .long _sys_getegid      /* getegid16 */ /* 50 */
1305         .long _sys_acct
1306         .long _sys_umount       /* recycled never used phys() */
1307         .long _sys_ni_syscall   /* old lock syscall holder */
1308         .long _sys_ioctl
1309         .long _sys_fcntl                /* 55 */
1310         .long _sys_ni_syscall   /* old mpx syscall holder */
1311         .long _sys_setpgid
1312         .long _sys_ni_syscall   /* old ulimit syscall holder */
1313         .long _sys_ni_syscall   /* old old uname */
1314         .long _sys_umask                /* 60 */
1315         .long _sys_chroot
1316         .long _sys_ustat
1317         .long _sys_dup2
1318         .long _sys_getppid
1319         .long _sys_getpgrp      /* 65 */
1320         .long _sys_setsid
1321         .long _sys_ni_syscall   /* old sys_sigaction */
1322         .long _sys_sgetmask
1323         .long _sys_ssetmask
1324         .long _sys_setreuid     /* setreuid16 */        /* 70 */
1325         .long _sys_setregid     /* setregid16 */
1326         .long _sys_ni_syscall   /* old sys_sigsuspend */
1327         .long _sys_ni_syscall   /* old sys_sigpending */
1328         .long _sys_sethostname
1329         .long _sys_setrlimit    /* 75 */
1330         .long _sys_ni_syscall   /* old getrlimit */
1331         .long _sys_getrusage
1332         .long _sys_gettimeofday
1333         .long _sys_settimeofday
1334         .long _sys_getgroups    /* getgroups16 */       /* 80 */
1335         .long _sys_setgroups    /* setgroups16 */
1336         .long _sys_ni_syscall   /* old_select */
1337         .long _sys_symlink
1338         .long _sys_ni_syscall   /* old lstat */
1339         .long _sys_readlink     /* 85 */
1340         .long _sys_uselib
1341         .long _sys_ni_syscall   /* sys_swapon */
1342         .long _sys_reboot
1343         .long _sys_ni_syscall   /* old_readdir */
1344         .long _sys_ni_syscall   /* sys_mmap */  /* 90 */
1345         .long _sys_munmap
1346         .long _sys_truncate
1347         .long _sys_ftruncate
1348         .long _sys_fchmod
1349         .long _sys_fchown       /* fchown16 */  /* 95 */
1350         .long _sys_getpriority
1351         .long _sys_setpriority
1352         .long _sys_ni_syscall   /* old profil syscall holder */
1353         .long _sys_statfs
1354         .long _sys_fstatfs      /* 100 */
1355         .long _sys_ni_syscall
1356         .long _sys_ni_syscall   /* old sys_socketcall */
1357         .long _sys_syslog
1358         .long _sys_setitimer
1359         .long _sys_getitimer    /* 105 */
1360         .long _sys_newstat
1361         .long _sys_newlstat
1362         .long _sys_newfstat
1363         .long _sys_ni_syscall   /* old uname */
1364         .long _sys_ni_syscall   /* iopl for i386 */ /* 110 */
1365         .long _sys_vhangup
1366         .long _sys_ni_syscall   /* obsolete idle() syscall */
1367         .long _sys_ni_syscall   /* vm86old for i386 */
1368         .long _sys_wait4
1369         .long _sys_ni_syscall   /* 115 */ /* sys_swapoff */
1370         .long _sys_sysinfo
1371         .long _sys_ni_syscall   /* old sys_ipc */
1372         .long _sys_fsync
1373         .long _sys_ni_syscall   /* old sys_sigreturn */
1374         .long _sys_clone                /* 120 */
1375         .long _sys_setdomainname
1376         .long _sys_newuname
1377         .long _sys_ni_syscall   /* old sys_modify_ldt */
1378         .long _sys_adjtimex
1379         .long _sys_ni_syscall   /* 125 */ /* sys_mprotect */
1380         .long _sys_ni_syscall   /* old sys_sigprocmask */
1381         .long _sys_ni_syscall   /* old "creat_module" */
1382         .long _sys_init_module
1383         .long _sys_delete_module
1384         .long _sys_ni_syscall   /* 130: old "get_kernel_syms" */
1385         .long _sys_quotactl
1386         .long _sys_getpgid
1387         .long _sys_fchdir
1388         .long _sys_bdflush
1389         .long _sys_ni_syscall   /* 135 */ /* sys_sysfs */
1390         .long _sys_personality
1391         .long _sys_ni_syscall   /* for afs_syscall */
1392         .long _sys_setfsuid     /* setfsuid16 */
1393         .long _sys_setfsgid     /* setfsgid16 */
1394         .long _sys_llseek       /* 140 */
1395         .long _sys_getdents
1396         .long _sys_ni_syscall   /* sys_select */
1397         .long _sys_flock
1398         .long _sys_ni_syscall   /* sys_msync */
1399         .long _sys_readv                /* 145 */
1400         .long _sys_writev
1401         .long _sys_getsid
1402         .long _sys_fdatasync
1403         .long _sys_sysctl
1404         .long _sys_ni_syscall   /* 150 */ /* sys_mlock */
1405         .long _sys_ni_syscall   /* sys_munlock */
1406         .long _sys_ni_syscall   /* sys_mlockall */
1407         .long _sys_ni_syscall   /* sys_munlockall */
1408         .long _sys_sched_setparam
1409         .long _sys_sched_getparam /* 155 */
1410         .long _sys_sched_setscheduler
1411         .long _sys_sched_getscheduler
1412         .long _sys_sched_yield
1413         .long _sys_sched_get_priority_max
1414         .long _sys_sched_get_priority_min  /* 160 */
1415         .long _sys_sched_rr_get_interval
1416         .long _sys_nanosleep
1417         .long _sys_mremap
1418         .long _sys_setresuid    /* setresuid16 */
1419         .long _sys_getresuid    /* getresuid16 */       /* 165 */
1420         .long _sys_ni_syscall   /* for vm86 */
1421         .long _sys_ni_syscall   /* old "query_module" */
1422         .long _sys_ni_syscall   /* sys_poll */
1423         .long _sys_nfsservctl
1424         .long _sys_setresgid    /* setresgid16 */       /* 170 */
1425         .long _sys_getresgid    /* getresgid16 */
1426         .long _sys_prctl
1427         .long _sys_rt_sigreturn
1428         .long _sys_rt_sigaction
1429         .long _sys_rt_sigprocmask /* 175 */
1430         .long _sys_rt_sigpending
1431         .long _sys_rt_sigtimedwait
1432         .long _sys_rt_sigqueueinfo
1433         .long _sys_rt_sigsuspend
1434         .long _sys_pread64      /* 180 */
1435         .long _sys_pwrite64
1436         .long _sys_lchown       /* lchown16 */
1437         .long _sys_getcwd
1438         .long _sys_capget
1439         .long _sys_capset       /* 185 */
1440         .long _sys_sigaltstack
1441         .long _sys_sendfile
1442         .long _sys_ni_syscall   /* streams1 */
1443         .long _sys_ni_syscall   /* streams2 */
1444         .long _sys_vfork                /* 190 */
1445         .long _sys_getrlimit
1446         .long _sys_mmap2
1447         .long _sys_truncate64
1448         .long _sys_ftruncate64
1449         .long _sys_stat64       /* 195 */
1450         .long _sys_lstat64
1451         .long _sys_fstat64
1452         .long _sys_chown
1453         .long _sys_getuid
1454         .long _sys_getgid       /* 200 */
1455         .long _sys_geteuid
1456         .long _sys_getegid
1457         .long _sys_setreuid
1458         .long _sys_setregid
1459         .long _sys_getgroups    /* 205 */
1460         .long _sys_setgroups
1461         .long _sys_fchown
1462         .long _sys_setresuid
1463         .long _sys_getresuid
1464         .long _sys_setresgid    /* 210 */
1465         .long _sys_getresgid
1466         .long _sys_lchown
1467         .long _sys_setuid
1468         .long _sys_setgid
1469         .long _sys_setfsuid     /* 215 */
1470         .long _sys_setfsgid
1471         .long _sys_pivot_root
1472         .long _sys_ni_syscall   /* sys_mincore */
1473         .long _sys_ni_syscall   /* sys_madvise */
1474         .long _sys_getdents64   /* 220 */
1475         .long _sys_fcntl64
1476         .long _sys_ni_syscall   /* reserved for TUX */
1477         .long _sys_ni_syscall
1478         .long _sys_gettid
1479         .long _sys_readahead    /* 225 */
1480         .long _sys_setxattr
1481         .long _sys_lsetxattr
1482         .long _sys_fsetxattr
1483         .long _sys_getxattr
1484         .long _sys_lgetxattr    /* 230 */
1485         .long _sys_fgetxattr
1486         .long _sys_listxattr
1487         .long _sys_llistxattr
1488         .long _sys_flistxattr
1489         .long _sys_removexattr  /* 235 */
1490         .long _sys_lremovexattr
1491         .long _sys_fremovexattr
1492         .long _sys_tkill
1493         .long _sys_sendfile64
1494         .long _sys_futex                /* 240 */
1495         .long _sys_sched_setaffinity
1496         .long _sys_sched_getaffinity
1497         .long _sys_ni_syscall   /* sys_set_thread_area */
1498         .long _sys_ni_syscall   /* sys_get_thread_area */
1499         .long _sys_io_setup     /* 245 */
1500         .long _sys_io_destroy
1501         .long _sys_io_getevents
1502         .long _sys_io_submit
1503         .long _sys_io_cancel
1504         .long _sys_ni_syscall   /* 250 */ /* sys_alloc_hugepages */
1505         .long _sys_ni_syscall   /* sys_freec_hugepages */
1506         .long _sys_exit_group
1507         .long _sys_lookup_dcookie
1508         .long _sys_bfin_spinlock
1509         .long _sys_epoll_create /* 255 */
1510         .long _sys_epoll_ctl
1511         .long _sys_epoll_wait
1512         .long _sys_ni_syscall /* remap_file_pages */
1513         .long _sys_set_tid_address
1514         .long _sys_timer_create /* 260 */
1515         .long _sys_timer_settime
1516         .long _sys_timer_gettime
1517         .long _sys_timer_getoverrun
1518         .long _sys_timer_delete
1519         .long _sys_clock_settime /* 265 */
1520         .long _sys_clock_gettime
1521         .long _sys_clock_getres
1522         .long _sys_clock_nanosleep
1523         .long _sys_statfs64
1524         .long _sys_fstatfs64    /* 270 */
1525         .long _sys_tgkill
1526         .long _sys_utimes
1527         .long _sys_fadvise64_64
1528         .long _sys_ni_syscall /* vserver */
1529         .long _sys_ni_syscall /* 275, mbind */
1530         .long _sys_ni_syscall /* get_mempolicy */
1531         .long _sys_ni_syscall /* set_mempolicy */
1532         .long _sys_mq_open
1533         .long _sys_mq_unlink
1534         .long _sys_mq_timedsend /* 280 */
1535         .long _sys_mq_timedreceive
1536         .long _sys_mq_notify
1537         .long _sys_mq_getsetattr
1538         .long _sys_ni_syscall /* kexec_load */
1539         .long _sys_waitid       /* 285 */
1540         .long _sys_add_key
1541         .long _sys_request_key
1542         .long _sys_keyctl
1543         .long _sys_ioprio_set
1544         .long _sys_ioprio_get   /* 290 */
1545         .long _sys_inotify_init
1546         .long _sys_inotify_add_watch
1547         .long _sys_inotify_rm_watch
1548         .long _sys_ni_syscall /* migrate_pages */
1549         .long _sys_openat       /* 295 */
1550         .long _sys_mkdirat
1551         .long _sys_mknodat
1552         .long _sys_fchownat
1553         .long _sys_futimesat
1554         .long _sys_fstatat64    /* 300 */
1555         .long _sys_unlinkat
1556         .long _sys_renameat
1557         .long _sys_linkat
1558         .long _sys_symlinkat
1559         .long _sys_readlinkat   /* 305 */
1560         .long _sys_fchmodat
1561         .long _sys_faccessat
1562         .long _sys_pselect6
1563         .long _sys_ppoll
1564         .long _sys_unshare      /* 310 */
1565         .long _sys_sram_alloc
1566         .long _sys_sram_free
1567         .long _sys_dma_memcpy
1568         .long _sys_accept
1569         .long _sys_bind         /* 315 */
1570         .long _sys_connect
1571         .long _sys_getpeername
1572         .long _sys_getsockname
1573         .long _sys_getsockopt
1574         .long _sys_listen       /* 320 */
1575         .long _sys_recv
1576         .long _sys_recvfrom
1577         .long _sys_recvmsg
1578         .long _sys_send
1579         .long _sys_sendmsg      /* 325 */
1580         .long _sys_sendto
1581         .long _sys_setsockopt
1582         .long _sys_shutdown
1583         .long _sys_socket
1584         .long _sys_socketpair   /* 330 */
1585         .long _sys_semctl
1586         .long _sys_semget
1587         .long _sys_semop
1588         .long _sys_msgctl
1589         .long _sys_msgget       /* 335 */
1590         .long _sys_msgrcv
1591         .long _sys_msgsnd
1592         .long _sys_shmat
1593         .long _sys_shmctl
1594         .long _sys_shmdt        /* 340 */
1595         .long _sys_shmget
1596         .long _sys_splice
1597         .long _sys_sync_file_range
1598         .long _sys_tee
1599         .long _sys_vmsplice     /* 345 */
1600         .long _sys_epoll_pwait
1601         .long _sys_utimensat
1602         .long _sys_signalfd
1603         .long _sys_timerfd_create
1604         .long _sys_eventfd      /* 350 */
1605         .long _sys_pread64
1606         .long _sys_pwrite64
1607         .long _sys_fadvise64
1608         .long _sys_set_robust_list
1609         .long _sys_get_robust_list      /* 355 */
1610         .long _sys_fallocate
1611         .long _sys_semtimedop
1612         .long _sys_timerfd_settime
1613         .long _sys_timerfd_gettime
1614         .long _sys_signalfd4            /* 360 */
1615         .long _sys_eventfd2
1616         .long _sys_epoll_create1
1617         .long _sys_dup3
1618         .long _sys_pipe2
1619         .long _sys_inotify_init1        /* 365 */
1620         .long _sys_preadv
1621         .long _sys_pwritev
1622         .long _sys_rt_tgsigqueueinfo
1623         .long _sys_perf_event_open
1624
1625         .rept NR_syscalls-(.-_sys_call_table)/4
1626         .long _sys_ni_syscall
1627         .endr
1628 END(_sys_call_table)