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
  46 #include <asm/mach-common/context.S>
  47
  48 #if defined(CONFIG_BFIN_SCRATCH_REG_RETN)
  49 # define EX_SCRATCH_REG RETN
  50 #elif defined(CONFIG_BFIN_SCRATCH_REG_RETE)
  51 # define EX_SCRATCH_REG RETE
  52 #else
  53 # define EX_SCRATCH_REG CYCLES
  54 #endif
  55
  56 #ifdef CONFIG_EXCPT_IRQ_SYSC_L1
  57 .section .l1.text
  58 #else
  59 .text
  60 #endif
  61
  62 /* Slightly simplified and streamlined entry point for CPLB misses.
  63  * This one does not lower the level to IRQ5, and thus can be used to
  64  * patch up CPLB misses on the kernel stack.
  65  */
  66 #if ANOMALY_05000261
  67 #define _ex_dviol _ex_workaround_261
  68 #define _ex_dmiss _ex_workaround_261
  69 #define _ex_dmult _ex_workaround_261
  70
  71 ENTRY(_ex_workaround_261)
  72         /*
  73          * Work around an anomaly: if we see a new DCPLB fault, return
  74          * without doing anything.  Then, if we get the same fault again,
  75          * handle it.
  76          */
  77         P4 = R7;        /* Store EXCAUSE */
  78         p5.l = _last_cplb_fault_retx;
  79         p5.h = _last_cplb_fault_retx;
  80         r7 = [p5];
  81         r6 = retx;
  82         [p5] = r6;
  83         cc = r6 == r7;
  84         if !cc jump _bfin_return_from_exception;
  85         /* fall through */
  86         R7 = P4;
  87         R6 = 0x26;      /* Data CPLB Miss */
  88         cc = R6 == R7;
  89         if cc jump _ex_dcplb_miss (BP);
  90         R6 = 0x23;      /* Data CPLB Miss */
  91         cc = R6 == R7;
  92         if cc jump _ex_dcplb_viol (BP);
  93         /* Handle 0x23 Data CPLB Protection Violation
  94          * and Data CPLB Multiple Hits - Linux Trap Zero
  95          */
  96         jump _ex_trap_c;
  97 ENDPROC(_ex_workaround_261)
  98
  99 #else
 100 #ifdef CONFIG_MPU
 101 #define _ex_dviol _ex_dcplb_viol
 102 #else
 103 #define _ex_dviol _ex_trap_c
 104 #endif
 105 #define _ex_dmiss _ex_dcplb_miss
 106 #define _ex_dmult _ex_trap_c
 107 #endif
 108
 109
 110 ENTRY(_ex_dcplb_viol)
 111 ENTRY(_ex_dcplb_miss)
 112 ENTRY(_ex_icplb_miss)
 113         (R7:6,P5:4) = [sp++];
 114         ASTAT = [sp++];
 115         SAVE_ALL_SYS
 116 #ifdef CONFIG_MPU
 117         /* We must load R1 here, _before_ DEBUG_HWTRACE_SAVE, since that
 118          * will change the stack pointer.  */
 119         R0 = SEQSTAT;
 120         R1 = SP;
 121 #endif
 122         DEBUG_HWTRACE_SAVE(p5, r7)
 123 #ifdef CONFIG_MPU
 124         sp += -12;
 125         call _cplb_hdr;
 126         sp += 12;
 127         CC = R0 == 0;
 128         IF !CC JUMP _handle_bad_cplb;
 129 #else
 130         call __cplb_hdr;
 131 #endif
 132         DEBUG_HWTRACE_RESTORE(p5, r7)
 133         RESTORE_ALL_SYS
 134         SP = EX_SCRATCH_REG;
 135         rtx;
 136 ENDPROC(_ex_icplb_miss)
 137
 138 ENTRY(_ex_syscall)
 139         (R7:6,P5:4) = [sp++];
 140         ASTAT = [sp++];
 141         raise 15;               /* invoked by TRAP #0, for sys call */
 142         sp = EX_SCRATCH_REG;
 143         rtx
 144 ENDPROC(_ex_syscall)
 145
 146 ENTRY(_ex_soft_bp)
 147         r7 = retx;
 148         r7 += -2;
 149         retx = r7;
 150         jump.s _ex_trap_c;
 151 ENDPROC(_ex_soft_bp)
 152
 153 ENTRY(_ex_single_step)
 154         /* If we just returned from an interrupt, the single step event is
 155            for the RTI instruction.  */
 156         r7 = retx;
 157         r6 = reti;
 158         cc = r7 == r6;
 159         if cc jump _bfin_return_from_exception;
 160
 161         /* Don't do single step in hardware exception handler */
 162         p5.l = lo(IPEND);
 163         p5.h = hi(IPEND);
 164         r6 = [p5];
 165         cc = bittst(r6, 5);
 166         if cc jump _bfin_return_from_exception;
 167
 168 #ifdef CONFIG_KGDB
 169         /* skip single step if current interrupt priority is higher than
 170          * that of the first instruction, from which gdb starts single step */
 171         r6 >>= 6;
 172         r7 = 10;
 173 .Lfind_priority_start:
 174         cc = bittst(r6, 0);
 175         if cc jump .Lfind_priority_done;
 176         r6 >>= 1;
 177         r7 += -1;
 178         cc = r7 == 0;
 179         if cc jump .Lfind_priority_done;
 180         jump.s .Lfind_priority_start;
 181 .Lfind_priority_done:
 182         p4.l = _debugger_step;
 183         p4.h = _debugger_step;
 184         r6 = [p4];
 185         cc = r6 == 0;
 186         if cc jump .Ldo_single_step;
 187         r6 += -1;
 188         cc = r6 < r7;
 189         if cc jump _bfin_return_from_exception;
 190 .Ldo_single_step:
 191 #endif
 192
 193         /* If we were in user mode, do the single step normally.  */
 194         r6 = [p5];
 195         r7 = 0xffe0 (z);
 196         r7 = r7 & r6;
 197         cc = r7 == 0;
 198         if cc jump 1f;
 199
 200         /*
 201          * We were in an interrupt handler.  By convention, all of them save
 202          * SYSCFG with their first instruction, so by checking whether our
 203          * RETX points at the entry point, we can determine whether to allow
 204          * a single step, or whether to clear SYSCFG.
 205          *
 206          * First, find out the interrupt level and the event vector for it.
 207          */
 208         p5.l = lo(EVT0);
 209         p5.h = hi(EVT0);
 210         p5 += -4;
 211 2:
 212         r7 = rot r7 by -1;
 213         p5 += 4;
 214         if !cc jump 2b;
 215
 216         /* What we actually do is test for the _second_ instruction in the
 217          * IRQ handler.  That way, if there are insns following the restore
 218          * of SYSCFG after leaving the handler, we will not turn off SYSCFG
 219          * for them.  */
 220
 221         r7 = [p5];
 222         r7 += 2;
 223         r6 = RETX;
 224         cc = R7 == R6;
 225         if !cc jump _bfin_return_from_exception;
 226
 227 1:
 228         /* Single stepping only a single instruction, so clear the trace
 229          * bit here.  */
 230         r7 = syscfg;
 231         bitclr (r7, 0);
 232         syscfg = R7;
 233
 234         jump _ex_trap_c;
 235
 236 ENDPROC(_ex_single_step)
 237
 238 ENTRY(_bfin_return_from_exception)
 239 #if ANOMALY_05000257
 240         R7=LC0;
 241         LC0=R7;
 242         R7=LC1;
 243         LC1=R7;
 244 #endif
 245         (R7:6,P5:4) = [sp++];
 246         ASTAT = [sp++];
 247         sp = EX_SCRATCH_REG;
 248         rtx;
 249 ENDPROC(_bfin_return_from_exception)
 250
 251 ENTRY(_handle_bad_cplb)
 252         DEBUG_HWTRACE_RESTORE(p5, r7)
 253         /* To get here, we just tried and failed to change a CPLB
 254          * so, handle things in trap_c (C code), by lowering to
 255          * IRQ5, just like we normally do. Since this is not a
 256          * "normal" return path, we have a do alot of stuff to
 257          * the stack to get ready so, we can fall through - we
 258          * need to make a CPLB exception look like a normal exception
 259          */
 260
 261         RESTORE_ALL_SYS
 262         [--sp] = ASTAT;
 263         [--sp] = (R7:6,P5:4);
 264
 265 ENTRY(_ex_replaceable)
 266         nop;
 267
 268 ENTRY(_ex_trap_c)
 269         /* Make sure we are not in a double fault */
 270         p4.l = lo(IPEND);
 271         p4.h = hi(IPEND);
 272         r7 = [p4];
 273         CC = BITTST (r7, 5);
 274         if CC jump _double_fault;
 275
 276         /* Call C code (trap_c) to handle the exception, which most
 277          * likely involves sending a signal to the current process.
 278          * To avoid double faults, lower our priority to IRQ5 first.
 279          */
 280         P5.h = _exception_to_level5;
 281         P5.l = _exception_to_level5;
 282         p4.l = lo(EVT5);
 283         p4.h = hi(EVT5);
 284         [p4] = p5;
 285         csync;
 286
 287         p4.l = lo(DCPLB_FAULT_ADDR);
 288         p4.h = hi(DCPLB_FAULT_ADDR);
 289         r7 = [p4];
 290         p5.h = _saved_dcplb_fault_addr;
 291         p5.l = _saved_dcplb_fault_addr;
 292         [p5] = r7;
 293
 294         r7 = [p4 + (ICPLB_FAULT_ADDR - DCPLB_FAULT_ADDR)];
 295         p5.h = _saved_icplb_fault_addr;
 296         p5.l = _saved_icplb_fault_addr;
 297         [p5] = r7;
 298
 299         p4.l = _excpt_saved_stuff;
 300         p4.h = _excpt_saved_stuff;
 301
 302         r6 = retx;
 303         [p4] = r6;
 304
 305         r6 = SYSCFG;
 306         [p4 + 4] = r6;
 307         BITCLR(r6, 0);
 308         SYSCFG = r6;
 309
 310         /* Disable all interrupts, but make sure level 5 is enabled so
 311          * we can switch to that level.  Save the old mask.  */
 312         cli r6;
 313         [p4 + 8] = r6;
 314
 315         p4.l = lo(SAFE_USER_INSTRUCTION);
 316         p4.h = hi(SAFE_USER_INSTRUCTION);
 317         retx = p4;
 318
 319         r6 = 0x3f;
 320         sti r6;
 321
 322         (R7:6,P5:4) = [sp++];
 323         ASTAT = [sp++];
 324         SP = EX_SCRATCH_REG;
 325         raise 5;
 326         rtx;
 327 ENDPROC(_ex_trap_c)
 328
 329 /* We just realized we got an exception, while we were processing a different
 330  * exception. This is a unrecoverable event, so crash
 331  */
 332 ENTRY(_double_fault)
 333         /* Turn caches & protection off, to ensure we don't get any more
 334          * double exceptions
 335          */
 336
 337         P4.L = LO(IMEM_CONTROL);
 338         P4.H = HI(IMEM_CONTROL);
 339
 340         R5 = [P4];              /* Control Register*/
 341         BITCLR(R5,ENICPLB_P);
 342         SSYNC;          /* SSYNC required before writing to IMEM_CONTROL. */
 343         .align 8;
 344         [P4] = R5;
 345         SSYNC;
 346
 347         P4.L = LO(DMEM_CONTROL);
 348         P4.H = HI(DMEM_CONTROL);
 349         R5 = [P4];
 350         BITCLR(R5,ENDCPLB_P);
 351         SSYNC;          /* SSYNC required before writing to DMEM_CONTROL. */
 352         .align 8;
 353         [P4] = R5;
 354         SSYNC;
 355
 356         /* Fix up the stack */
 357         (R7:6,P5:4) = [sp++];
 358         ASTAT = [sp++];
 359         SP = EX_SCRATCH_REG;
 360
 361         /* We should be out of the exception stack, and back down into
 362          * kernel or user space stack
 363          */
 364         SAVE_ALL_SYS
 365
 366         /* The dumping functions expect the return address in the RETI
 367          * slot.  */
 368         r6 = retx;
 369         [sp + PT_PC] = r6;
 370
 371         r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
 372         SP += -12;
 373         call _double_fault_c;
 374         SP += 12;
 375 .L_double_fault_panic:
 376         JUMP .L_double_fault_panic
 377
 378 ENDPROC(_double_fault)
 379
 380 ENTRY(_exception_to_level5)
 381         SAVE_ALL_SYS
 382
 383         p4.l = _excpt_saved_stuff;
 384         p4.h = _excpt_saved_stuff;
 385         r6 = [p4];
 386         [sp + PT_PC] = r6;
 387
 388         r6 = [p4 + 4];
 389         [sp + PT_SYSCFG] = r6;
 390
 391         /* Restore interrupt mask.  We haven't pushed RETI, so this
 392          * doesn't enable interrupts until we return from this handler.  */
 393         r6 = [p4 + 8];
 394         sti r6;
 395
 396         /* Restore the hardware error vector.  */
 397         P5.h = _evt_ivhw;
 398         P5.l = _evt_ivhw;
 399         p4.l = lo(EVT5);
 400         p4.h = hi(EVT5);
 401         [p4] = p5;
 402         csync;
 403
 404         p2.l = lo(IPEND);
 405         p2.h = hi(IPEND);
 406         csync;
 407         r0 = [p2];              /* Read current IPEND */
 408         [sp + PT_IPEND] = r0;   /* Store IPEND */
 409
 410         r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
 411         SP += -12;
 412         call _trap_c;
 413         SP += 12;
 414
 415         call _ret_from_exception;
 416         RESTORE_ALL_SYS
 417         rti;
 418 ENDPROC(_exception_to_level5)
 419
 420 ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
 421         /* Since the kernel stack can be anywhere, it's not guaranteed to be
 422          * covered by a CPLB.  Switch to an exception stack; use RETN as a
 423          * scratch register (for want of a better option).
 424          */
 425         EX_SCRATCH_REG = sp;
 426         sp.l = _exception_stack_top;
 427         sp.h = _exception_stack_top;
 428         /* Try to deal with syscalls quickly.  */
 429         [--sp] = ASTAT;
 430         [--sp] = (R7:6,P5:4);
 431         r7 = SEQSTAT;           /* reason code is in bit 5:0 */
 432         r6.l = lo(SEQSTAT_EXCAUSE);
 433         r6.h = hi(SEQSTAT_EXCAUSE);
 434         r7 = r7 & r6;
 435         p5.h = _ex_table;
 436         p5.l = _ex_table;
 437         p4 = r7;
 438         p5 = p5 + (p4 << 2);
 439         p4 = [p5];
 440         jump (p4);
 441
 442 .Lbadsys:
 443         r7 = -ENOSYS;           /* signextending enough */
 444         [sp + PT_R0] = r7;      /* return value from system call */
 445         jump .Lsyscall_really_exit;
 446 ENDPROC(_trap)
 447
 448 ENTRY(_kernel_execve)
 449         link SIZEOF_PTREGS;
 450         p0 = sp;
 451         r3 = SIZEOF_PTREGS / 4;
 452         r4 = 0(x);
 453 0:
 454         [p0++] = r4;
 455         r3 += -1;
 456         cc = r3 == 0;
 457         if !cc jump 0b (bp);
 458
 459         p0 = sp;
 460         sp += -16;
 461         [sp + 12] = p0;
 462         call _do_execve;
 463         SP += 16;
 464         cc = r0 == 0;
 465         if ! cc jump 1f;
 466         /* Success.  Copy our temporary pt_regs to the top of the kernel
 467          * stack and do a normal exception return.
 468          */
 469         r1 = sp;
 470         r0 = (-KERNEL_STACK_SIZE) (x);
 471         r1 = r1 & r0;
 472         p2 = r1;
 473         p3 = [p2];
 474         r0 = KERNEL_STACK_SIZE - 4 (z);
 475         p1 = r0;
 476         p1 = p1 + p2;
 477
 478         p0 = fp;
 479         r4 = [p0--];
 480         r3 = SIZEOF_PTREGS / 4;
 481 0:
 482         r4 = [p0--];
 483         [p1--] = r4;
 484         r3 += -1;
 485         cc = r3 == 0;
 486         if ! cc jump 0b (bp);
 487
 488         r0 = (KERNEL_STACK_SIZE - SIZEOF_PTREGS) (z);
 489         p1 = r0;
 490         p1 = p1 + p2;
 491         sp = p1;
 492         r0 = syscfg;
 493         [SP + PT_SYSCFG] = r0;
 494         [p3 + (TASK_THREAD + THREAD_KSP)] = sp;
 495
 496         RESTORE_CONTEXT;
 497         rti;
 498 1:
 499         unlink;
 500         rts;
 501 ENDPROC(_kernel_execve)
 502
 503 ENTRY(_system_call)
 504         /* Store IPEND */
 505         p2.l = lo(IPEND);
 506         p2.h = hi(IPEND);
 507         csync;
 508         r0 = [p2];
 509         [sp + PT_IPEND] = r0;
 510
 511         /* Store RETS for now */
 512         r0 = rets;
 513         [sp + PT_RESERVED] = r0;
 514         /* Set the stack for the current process */
 515         r7 = sp;
 516         r6.l = lo(ALIGN_PAGE_MASK);
 517         r6.h = hi(ALIGN_PAGE_MASK);
 518         r7 = r7 & r6;           /* thread_info */
 519         p2 = r7;
 520         p2 = [p2];
 521
 522         [p2+(TASK_THREAD+THREAD_KSP)] = sp;
 523
 524         /* Check the System Call */
 525         r7 = __NR_syscall;
 526         /* System call number is passed in P0 */
 527         r6 = p0;
 528         cc = r6 < r7;
 529         if ! cc jump .Lbadsys;
 530
 531         /* are we tracing syscalls?*/
 532         r7 = sp;
 533         r6.l = lo(ALIGN_PAGE_MASK);
 534         r6.h = hi(ALIGN_PAGE_MASK);
 535         r7 = r7 & r6;
 536         p2 = r7;
 537         r7 = [p2+TI_FLAGS];
 538         CC = BITTST(r7,TIF_SYSCALL_TRACE);
 539         if CC JUMP _sys_trace;
 540
 541         /* Execute the appropriate system call */
 542
 543         p4 = p0;
 544         p5.l = _sys_call_table;
 545         p5.h = _sys_call_table;
 546         p5 = p5 + (p4 << 2);
 547         r0 = [sp + PT_R0];
 548         r1 = [sp + PT_R1];
 549         r2 = [sp + PT_R2];
 550         p5 = [p5];
 551
 552         [--sp] = r5;
 553         [--sp] = r4;
 554         [--sp] = r3;
 555         SP += -12;
 556         call (p5);
 557         SP += 24;
 558         [sp + PT_R0] = r0;
 559
 560 .Lresume_userspace:
 561         r7 = sp;
 562         r4.l = lo(ALIGN_PAGE_MASK);
 563         r4.h = hi(ALIGN_PAGE_MASK);
 564         r7 = r7 & r4;           /* thread_info->flags */
 565         p5 = r7;
 566 .Lresume_userspace_1:
 567         /* Disable interrupts.  */
 568         [--sp] = reti;
 569         reti = [sp++];
 570
 571         r7 = [p5 + TI_FLAGS];
 572         r4.l = lo(_TIF_WORK_MASK);
 573         r4.h = hi(_TIF_WORK_MASK);
 574         r7 =  r7 & r4;
 575
 576 .Lsyscall_resched:
 577         cc = BITTST(r7, TIF_NEED_RESCHED);
 578         if !cc jump .Lsyscall_sigpending;
 579
 580         /* Reenable interrupts.  */
 581         [--sp] = reti;
 582         r0 = [sp++];
 583
 584         SP += -12;
 585         call _schedule;
 586         SP += 12;
 587
 588         jump .Lresume_userspace_1;
 589
 590 .Lsyscall_sigpending:
 591         cc = BITTST(r7, TIF_RESTORE_SIGMASK);
 592         if cc jump .Lsyscall_do_signals;
 593         cc = BITTST(r7, TIF_SIGPENDING);
 594         if !cc jump .Lsyscall_really_exit;
 595 .Lsyscall_do_signals:
 596         /* Reenable interrupts.  */
 597         [--sp] = reti;
 598         r0 = [sp++];
 599
 600         r0 = sp;
 601         SP += -12;
 602         call _do_signal;
 603         SP += 12;
 604
 605 .Lsyscall_really_exit:
 606         r5 = [sp + PT_RESERVED];
 607         rets = r5;
 608         rts;
 609 ENDPROC(_system_call)
 610
 611 _sys_trace:
 612         call _syscall_trace;
 613
 614         /* Execute the appropriate system call */
 615
 616         p4 = [SP + PT_P0];
 617         p5.l = _sys_call_table;
 618         p5.h = _sys_call_table;
 619         p5 = p5 + (p4 << 2);
 620         r0 = [sp + PT_R0];
 621         r1 = [sp + PT_R1];
 622         r2 = [sp + PT_R2];
 623         r3 = [sp + PT_R3];
 624         r4 = [sp + PT_R4];
 625         r5 = [sp + PT_R5];
 626         p5 = [p5];
 627
 628         [--sp] = r5;
 629         [--sp] = r4;
 630         [--sp] = r3;
 631         SP += -12;
 632         call (p5);
 633         SP += 24;
 634         [sp + PT_R0] = r0;
 635
 636         call _syscall_trace;
 637         jump .Lresume_userspace;
 638 ENDPROC(_sys_trace)
 639
 640 ENTRY(_resume)
 641         /*
 642          * Beware - when entering resume, prev (the current task) is
 643          * in r0, next (the new task) is in r1.
 644          */
 645         p0 = r0;
 646         p1 = r1;
 647         [--sp] = rets;
 648         [--sp] = fp;
 649         [--sp] = (r7:4, p5:3);
 650
 651         /* save usp */
 652         p2 = usp;
 653         [p0+(TASK_THREAD+THREAD_USP)] = p2;
 654
 655         /* save current kernel stack pointer */
 656         [p0+(TASK_THREAD+THREAD_KSP)] = sp;
 657
 658         /* save program counter */
 659         r1.l = _new_old_task;
 660         r1.h = _new_old_task;
 661         [p0+(TASK_THREAD+THREAD_PC)] = r1;
 662
 663         /* restore the kernel stack pointer */
 664         sp = [p1+(TASK_THREAD+THREAD_KSP)];
 665
 666         /* restore user stack pointer */
 667         p0 = [p1+(TASK_THREAD+THREAD_USP)];
 668         usp = p0;
 669
 670         /* restore pc */
 671         p0 = [p1+(TASK_THREAD+THREAD_PC)];
 672         jump (p0);
 673
 674         /*
 675          * Following code actually lands up in a new (old) task.
 676          */
 677
 678 _new_old_task:
 679         (r7:4, p5:3) = [sp++];
 680         fp = [sp++];
 681         rets = [sp++];
 682
 683         /*
 684          * When we come out of resume, r0 carries "old" task, becuase we are
 685          * in "new" task.
 686          */
 687         rts;
 688 ENDPROC(_resume)
 689
 690 ENTRY(_ret_from_exception)
 691         p2.l = lo(IPEND);
 692         p2.h = hi(IPEND);
 693
 694         csync;
 695         r0 = [p2];
 696         [sp + PT_IPEND] = r0;
 697
 698 1:
 699         r2 = LO(~0x37) (Z);
 700         r0 = r2 & r0;
 701         cc = r0 == 0;
 702         if !cc jump 4f; /* if not return to user mode, get out */
 703
 704         /* Make sure any pending system call or deferred exception
 705          * return in ILAT for this process to get executed, otherwise
 706          * in case context switch happens, system call of
 707          * first process (i.e in ILAT) will be carried
 708          * forward to the switched process
 709          */
 710
 711         p2.l = lo(ILAT);
 712         p2.h = hi(ILAT);
 713         r0 = [p2];
 714         r1 = (EVT_IVG14 | EVT_IVG15) (z);
 715         r0 = r0 & r1;
 716         cc = r0 == 0;
 717         if !cc jump 5f;
 718
 719         /* Set the stack for the current process */
 720         r7 = sp;
 721         r4.l = lo(ALIGN_PAGE_MASK);
 722         r4.h = hi(ALIGN_PAGE_MASK);
 723         r7 = r7 & r4;           /* thread_info->flags */
 724         p5 = r7;
 725         r7 = [p5 + TI_FLAGS];
 726         r4.l = lo(_TIF_WORK_MASK);
 727         r4.h = hi(_TIF_WORK_MASK);
 728         r7 =  r7 & r4;
 729         cc = r7 == 0;
 730         if cc jump 4f;
 731
 732         p0.l = lo(EVT15);
 733         p0.h = hi(EVT15);
 734         p1.l = _schedule_and_signal;
 735         p1.h = _schedule_and_signal;
 736         [p0] = p1;
 737         csync;
 738         raise 15;               /* raise evt14 to do signal or reschedule */
 739 4:
 740         r0 = syscfg;
 741         bitclr(r0, 0);
 742         syscfg = r0;
 743 5:
 744         rts;
 745 ENDPROC(_ret_from_exception)
 746
 747 ENTRY(_return_from_int)
 748         /* If someone else already raised IRQ 15, do nothing.  */
 749         csync;
 750         p2.l = lo(ILAT);
 751         p2.h = hi(ILAT);
 752         r0 = [p2];
 753         cc = bittst (r0, EVT_IVG15_P);
 754         if cc jump 2f;
 755
 756         /* if not return to user mode, get out */
 757         p2.l = lo(IPEND);
 758         p2.h = hi(IPEND);
 759         r0 = [p2];
 760         r1 = 0x17(Z);
 761         r2 = ~r1;
 762         r2.h = 0;
 763         r0 = r2 & r0;
 764         r1 = 1;
 765         r1 = r0 - r1;
 766         r2 = r0 & r1;
 767         cc = r2 == 0;
 768         if !cc jump 2f;
 769
 770         /* Lower the interrupt level to 15.  */
 771         p0.l = lo(EVT15);
 772         p0.h = hi(EVT15);
 773         p1.l = _schedule_and_signal_from_int;
 774         p1.h = _schedule_and_signal_from_int;
 775         [p0] = p1;
 776         csync;
 777 #if ANOMALY_05000281
 778         r0.l = lo(SAFE_USER_INSTRUCTION);
 779         r0.h = hi(SAFE_USER_INSTRUCTION);
 780         reti = r0;
 781 #endif
 782         r0 = 0x801f (z);
 783         STI r0;
 784         raise 15;       /* raise evt15 to do signal or reschedule */
 785         rti;
 786 2:
 787         rts;
 788 ENDPROC(_return_from_int)
 789
 790 ENTRY(_lower_to_irq14)
 791 #if ANOMALY_05000281
 792         r0.l = lo(SAFE_USER_INSTRUCTION);
 793         r0.h = hi(SAFE_USER_INSTRUCTION);
 794         reti = r0;
 795 #endif
 796         r0 = 0x401f;
 797         sti r0;
 798         raise 14;
 799         rti;
 800 ENTRY(_evt14_softirq)
 801 #ifdef CONFIG_DEBUG_HWERR
 802         r0 = 0x3f;
 803         sti r0;
 804 #else
 805         cli r0;
 806 #endif
 807         [--sp] = RETI;
 808         SP += 4;
 809         rts;
 810
 811 _schedule_and_signal_from_int:
 812         /* To end up here, vector 15 was changed - so we have to change it
 813          * back.
 814          */
 815         p0.l = lo(EVT15);
 816         p0.h = hi(EVT15);
 817         p1.l = _evt_system_call;
 818         p1.h = _evt_system_call;
 819         [p0] = p1;
 820         csync;
 821
 822         /* Set orig_p0 to -1 to indicate this isn't the end of a syscall.  */
 823         r0 = -1 (x);
 824         [sp + PT_ORIG_P0] = r0;
 825
 826         p1 = rets;
 827         [sp + PT_RESERVED] = p1;
 828
 829         p0.l = _irq_flags;
 830         p0.h = _irq_flags;
 831         r0 = [p0];
 832         sti r0;
 833
 834         r0 = sp;
 835         sp += -12;
 836         call _finish_atomic_sections;
 837         sp += 12;
 838         jump.s .Lresume_userspace;
 839
 840 _schedule_and_signal:
 841         SAVE_CONTEXT_SYSCALL
 842         /* To end up here, vector 15 was changed - so we have to change it
 843          * back.
 844          */
 845         p0.l = lo(EVT15);
 846         p0.h = hi(EVT15);
 847         p1.l = _evt_system_call;
 848         p1.h = _evt_system_call;
 849         [p0] = p1;
 850         csync;
 851         p0.l = 1f;
 852         p0.h = 1f;
 853         [sp + PT_RESERVED] = P0;
 854         call .Lresume_userspace;
 855 1:
 856         RESTORE_CONTEXT
 857         rti;
 858 ENDPROC(_lower_to_irq14)
 859
 860 /* We handle this 100% in exception space - to reduce overhead
 861  * Only potiential problem is if the software buffer gets swapped out of the
 862  * CPLB table - then double fault. - so we don't let this happen in other places
 863  */
 864 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 865 ENTRY(_ex_trace_buff_full)
 866         [--sp] = P3;
 867         [--sp] = P2;
 868         [--sp] = LC0;
 869         [--sp] = LT0;
 870         [--sp] = LB0;
 871         P5.L = _trace_buff_offset;
 872         P5.H = _trace_buff_offset;
 873         P3 = [P5];              /* trace_buff_offset */
 874         P5.L = lo(TBUFSTAT);
 875         P5.H = hi(TBUFSTAT);
 876         R7 = [P5];
 877         R7 <<= 1;               /* double, since we need to read twice */
 878         LC0 = R7;
 879         R7 <<= 2;               /* need to shift over again,
 880                                  * to get the number of bytes */
 881         P5.L = lo(TBUF);
 882         P5.H = hi(TBUF);
 883         R6 = ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*1024) - 1;
 884
 885         P2 = R7;
 886         P3 = P3 + P2;
 887         R7 = P3;
 888         R7 = R7 & R6;
 889         P3 = R7;
 890         P2.L = _trace_buff_offset;
 891         P2.H = _trace_buff_offset;
 892         [P2] = P3;
 893
 894         P2.L = _software_trace_buff;
 895         P2.H = _software_trace_buff;
 896
 897         LSETUP (.Lstart, .Lend) LC0;
 898 .Lstart:
 899         R7 = [P5];      /* read TBUF */
 900         P4 = P3 + P2;
 901         [P4] = R7;
 902         P3 += -4;
 903         R7 = P3;
 904         R7 = R7 & R6;
 905 .Lend:
 906         P3 = R7;
 907
 908         LB0 = [sp++];
 909         LT0 = [sp++];
 910         LC0 = [sp++];
 911         P2 = [sp++];
 912         P3 = [sp++];
 913         jump _bfin_return_from_exception;
 914 ENDPROC(_ex_trace_buff_full)
 915
 916 #if CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN == 4
 917 .data
 918 #else
 919 .section .l1.data.B
 920 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN */
 921 ENTRY(_trace_buff_offset)
 922         .long 0;
 923 ALIGN
 924 ENTRY(_software_trace_buff)
 925         .rept ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*256);
 926         .long 0
 927         .endr
 928 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND */
 929
 930 #if CONFIG_EARLY_PRINTK
 931 __INIT
 932 ENTRY(_early_trap)
 933         SAVE_ALL_SYS
 934         trace_buffer_stop(p0,r0);
 935
 936         /* Turn caches off, to ensure we don't get double exceptions */
 937
 938         P4.L = LO(IMEM_CONTROL);
 939         P4.H = HI(IMEM_CONTROL);
 940
 941         R5 = [P4];              /* Control Register*/
 942         BITCLR(R5,ENICPLB_P);
 943         CLI R1;
 944         SSYNC;          /* SSYNC required before writing to IMEM_CONTROL. */
 945         .align 8;
 946         [P4] = R5;
 947         SSYNC;
 948
 949         P4.L = LO(DMEM_CONTROL);
 950         P4.H = HI(DMEM_CONTROL);
 951         R5 = [P4];
 952         BITCLR(R5,ENDCPLB_P);
 953         SSYNC;          /* SSYNC required before writing to DMEM_CONTROL. */
 954         .align 8;
 955         [P4] = R5;
 956         SSYNC;
 957         STI R1;
 958
 959         r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
 960         r1 = RETX;
 961
 962         SP += -12;
 963         call _early_trap_c;
 964         SP += 12;
 965 ENDPROC(_early_trap)
 966 __FINIT
 967 #endif /* CONFIG_EARLY_PRINTK */
 968
 969 /*
 970  * Put these in the kernel data section - that should always be covered by
 971  * a CPLB. This is needed to ensure we don't get double fault conditions
 972  */
 973
 974 #ifdef CONFIG_SYSCALL_TAB_L1
 975 .section .l1.data
 976 #else
 977 .data
 978 #endif
 979
 980 ENTRY(_ex_table)
 981         /* entry for each EXCAUSE[5:0]
 982          * This table must be in sync with the table in ./kernel/traps.c
 983          * EXCPT instruction can provide 4 bits of EXCAUSE, allowing 16 to be user defined
 984          */
 985         .long _ex_syscall       /* 0x00 - User Defined - Linux Syscall */
 986         .long _ex_soft_bp       /* 0x01 - User Defined - Software breakpoint */
 987         .long _ex_replaceable   /* 0x02 - User Defined */
 988         .long _ex_trap_c        /* 0x03 - User Defined - userspace stack overflow */
 989         .long _ex_trap_c        /* 0x04 - User Defined - dump trace buffer */
 990         .long _ex_replaceable   /* 0x05 - User Defined */
 991         .long _ex_replaceable   /* 0x06 - User Defined */
 992         .long _ex_replaceable   /* 0x07 - User Defined */
 993         .long _ex_replaceable   /* 0x08 - User Defined */
 994         .long _ex_replaceable   /* 0x09 - User Defined */
 995         .long _ex_replaceable   /* 0x0A - User Defined */
 996         .long _ex_replaceable   /* 0x0B - User Defined */
 997         .long _ex_replaceable   /* 0x0C - User Defined */
 998         .long _ex_replaceable   /* 0x0D - User Defined */
 999         .long _ex_replaceable   /* 0x0E - User Defined */
1000         .long _ex_replaceable   /* 0x0F - User Defined */
1001         .long _ex_single_step   /* 0x10 - HW Single step */
1002 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
1003         .long _ex_trace_buff_full /* 0x11 - Trace Buffer Full */
1004 #else
1005         .long _ex_trap_c        /* 0x11 - Trace Buffer Full */
1006 #endif
1007         .long _ex_trap_c        /* 0x12 - Reserved */
1008         .long _ex_trap_c        /* 0x13 - Reserved */
1009         .long _ex_trap_c        /* 0x14 - Reserved */
1010         .long _ex_trap_c        /* 0x15 - Reserved */
1011         .long _ex_trap_c        /* 0x16 - Reserved */
1012         .long _ex_trap_c        /* 0x17 - Reserved */
1013         .long _ex_trap_c        /* 0x18 - Reserved */
1014         .long _ex_trap_c        /* 0x19 - Reserved */
1015         .long _ex_trap_c        /* 0x1A - Reserved */
1016         .long _ex_trap_c        /* 0x1B - Reserved */
1017         .long _ex_trap_c        /* 0x1C - Reserved */
1018         .long _ex_trap_c        /* 0x1D - Reserved */
1019         .long _ex_trap_c        /* 0x1E - Reserved */
1020         .long _ex_trap_c        /* 0x1F - Reserved */
1021         .long _ex_trap_c        /* 0x20 - Reserved */
1022         .long _ex_trap_c        /* 0x21 - Undefined Instruction */
1023         .long _ex_trap_c        /* 0x22 - Illegal Instruction Combination */
1024         .long _ex_dviol         /* 0x23 - Data CPLB Protection Violation */
1025         .long _ex_trap_c        /* 0x24 - Data access misaligned */
1026         .long _ex_trap_c        /* 0x25 - Unrecoverable Event */
1027         .long _ex_dmiss         /* 0x26 - Data CPLB Miss */
1028         .long _ex_dmult         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero */
1029         .long _ex_trap_c        /* 0x28 - Emulation Watchpoint */
1030         .long _ex_trap_c        /* 0x29 - Instruction fetch access error (535 only) */
1031         .long _ex_trap_c        /* 0x2A - Instruction fetch misaligned */
1032         .long _ex_trap_c        /* 0x2B - Instruction CPLB protection Violation */
1033         .long _ex_icplb_miss    /* 0x2C - Instruction CPLB miss */
1034         .long _ex_trap_c        /* 0x2D - Instruction CPLB Multiple Hits */
1035         .long _ex_trap_c        /* 0x2E - Illegal use of Supervisor Resource */
1036         .long _ex_trap_c        /* 0x2E - Illegal use of Supervisor Resource */
1037         .long _ex_trap_c        /* 0x2F - Reserved */
1038         .long _ex_trap_c        /* 0x30 - Reserved */
1039         .long _ex_trap_c        /* 0x31 - Reserved */
1040         .long _ex_trap_c        /* 0x32 - Reserved */
1041         .long _ex_trap_c        /* 0x33 - Reserved */
1042         .long _ex_trap_c        /* 0x34 - Reserved */
1043         .long _ex_trap_c        /* 0x35 - Reserved */
1044         .long _ex_trap_c        /* 0x36 - Reserved */
1045         .long _ex_trap_c        /* 0x37 - Reserved */
1046         .long _ex_trap_c        /* 0x38 - Reserved */
1047         .long _ex_trap_c        /* 0x39 - Reserved */
1048         .long _ex_trap_c        /* 0x3A - Reserved */
1049         .long _ex_trap_c        /* 0x3B - Reserved */
1050         .long _ex_trap_c        /* 0x3C - Reserved */
1051         .long _ex_trap_c        /* 0x3D - Reserved */
1052         .long _ex_trap_c        /* 0x3E - Reserved */
1053         .long _ex_trap_c        /* 0x3F - Reserved */
1054 END(_ex_table)
1055
1056 ENTRY(_sys_call_table)
1057         .long _sys_restart_syscall      /* 0 */
1058         .long _sys_exit
1059         .long _sys_fork
1060         .long _sys_read
1061         .long _sys_write
1062         .long _sys_open         /* 5 */
1063         .long _sys_close
1064         .long _sys_ni_syscall   /* old waitpid */
1065         .long _sys_creat
1066         .long _sys_link
1067         .long _sys_unlink       /* 10 */
1068         .long _sys_execve
1069         .long _sys_chdir
1070         .long _sys_time
1071         .long _sys_mknod
1072         .long _sys_chmod                /* 15 */
1073         .long _sys_chown        /* chown16 */
1074         .long _sys_ni_syscall   /* old break syscall holder */
1075         .long _sys_ni_syscall   /* old stat */
1076         .long _sys_lseek
1077         .long _sys_getpid       /* 20 */
1078         .long _sys_mount
1079         .long _sys_ni_syscall   /* old umount */
1080         .long _sys_setuid
1081         .long _sys_getuid
1082         .long _sys_stime                /* 25 */
1083         .long _sys_ptrace
1084         .long _sys_alarm
1085         .long _sys_ni_syscall   /* old fstat */
1086         .long _sys_pause
1087         .long _sys_ni_syscall   /* old utime */ /* 30 */
1088         .long _sys_ni_syscall   /* old stty syscall holder */
1089         .long _sys_ni_syscall   /* old gtty syscall holder */
1090         .long _sys_access
1091         .long _sys_nice
1092         .long _sys_ni_syscall   /* 35 */ /* old ftime syscall holder */
1093         .long _sys_sync
1094         .long _sys_kill
1095         .long _sys_rename
1096         .long _sys_mkdir
1097         .long _sys_rmdir                /* 40 */
1098         .long _sys_dup
1099         .long _sys_pipe
1100         .long _sys_times
1101         .long _sys_ni_syscall   /* old prof syscall holder */
1102         .long _sys_brk          /* 45 */
1103         .long _sys_setgid
1104         .long _sys_getgid
1105         .long _sys_ni_syscall   /* old sys_signal */
1106         .long _sys_geteuid      /* geteuid16 */
1107         .long _sys_getegid      /* getegid16 */ /* 50 */
1108         .long _sys_acct
1109         .long _sys_umount       /* recycled never used phys() */
1110         .long _sys_ni_syscall   /* old lock syscall holder */
1111         .long _sys_ioctl
1112         .long _sys_fcntl                /* 55 */
1113         .long _sys_ni_syscall   /* old mpx syscall holder */
1114         .long _sys_setpgid
1115         .long _sys_ni_syscall   /* old ulimit syscall holder */
1116         .long _sys_ni_syscall   /* old old uname */
1117         .long _sys_umask                /* 60 */
1118         .long _sys_chroot
1119         .long _sys_ustat
1120         .long _sys_dup2
1121         .long _sys_getppid
1122         .long _sys_getpgrp      /* 65 */
1123         .long _sys_setsid
1124         .long _sys_ni_syscall   /* old sys_sigaction */
1125         .long _sys_sgetmask
1126         .long _sys_ssetmask
1127         .long _sys_setreuid     /* setreuid16 */        /* 70 */
1128         .long _sys_setregid     /* setregid16 */
1129         .long _sys_ni_syscall   /* old sys_sigsuspend */
1130         .long _sys_ni_syscall   /* old sys_sigpending */
1131         .long _sys_sethostname
1132         .long _sys_setrlimit    /* 75 */
1133         .long _sys_ni_syscall   /* old getrlimit */
1134         .long _sys_getrusage
1135         .long _sys_gettimeofday
1136         .long _sys_settimeofday
1137         .long _sys_getgroups    /* getgroups16 */       /* 80 */
1138         .long _sys_setgroups    /* setgroups16 */
1139         .long _sys_ni_syscall   /* old_select */
1140         .long _sys_symlink
1141         .long _sys_ni_syscall   /* old lstat */
1142         .long _sys_readlink     /* 85 */
1143         .long _sys_uselib
1144         .long _sys_ni_syscall   /* sys_swapon */
1145         .long _sys_reboot
1146         .long _sys_ni_syscall   /* old_readdir */
1147         .long _sys_ni_syscall   /* sys_mmap */  /* 90 */
1148         .long _sys_munmap
1149         .long _sys_truncate
1150         .long _sys_ftruncate
1151         .long _sys_fchmod
1152         .long _sys_fchown       /* fchown16 */  /* 95 */
1153         .long _sys_getpriority
1154         .long _sys_setpriority
1155         .long _sys_ni_syscall   /* old profil syscall holder */
1156         .long _sys_statfs
1157         .long _sys_fstatfs      /* 100 */
1158         .long _sys_ni_syscall
1159         .long _sys_ni_syscall   /* old sys_socketcall */
1160         .long _sys_syslog
1161         .long _sys_setitimer
1162         .long _sys_getitimer    /* 105 */
1163         .long _sys_newstat
1164         .long _sys_newlstat
1165         .long _sys_newfstat
1166         .long _sys_ni_syscall   /* old uname */
1167         .long _sys_ni_syscall   /* iopl for i386 */ /* 110 */
1168         .long _sys_vhangup
1169         .long _sys_ni_syscall   /* obsolete idle() syscall */
1170         .long _sys_ni_syscall   /* vm86old for i386 */
1171         .long _sys_wait4
1172         .long _sys_ni_syscall   /* 115 */ /* sys_swapoff */
1173         .long _sys_sysinfo
1174         .long _sys_ni_syscall   /* old sys_ipc */
1175         .long _sys_fsync
1176         .long _sys_ni_syscall   /* old sys_sigreturn */
1177         .long _sys_clone                /* 120 */
1178         .long _sys_setdomainname
1179         .long _sys_newuname
1180         .long _sys_ni_syscall   /* old sys_modify_ldt */
1181         .long _sys_adjtimex
1182         .long _sys_ni_syscall   /* 125 */ /* sys_mprotect */
1183         .long _sys_ni_syscall   /* old sys_sigprocmask */
1184         .long _sys_ni_syscall   /* old "creat_module" */
1185         .long _sys_init_module
1186         .long _sys_delete_module
1187         .long _sys_ni_syscall   /* 130: old "get_kernel_syms" */
1188         .long _sys_quotactl
1189         .long _sys_getpgid
1190         .long _sys_fchdir
1191         .long _sys_bdflush
1192         .long _sys_ni_syscall   /* 135 */ /* sys_sysfs */
1193         .long _sys_personality
1194         .long _sys_ni_syscall   /* for afs_syscall */
1195         .long _sys_setfsuid     /* setfsuid16 */
1196         .long _sys_setfsgid     /* setfsgid16 */
1197         .long _sys_llseek       /* 140 */
1198         .long _sys_getdents
1199         .long _sys_ni_syscall   /* sys_select */
1200         .long _sys_flock
1201         .long _sys_ni_syscall   /* sys_msync */
1202         .long _sys_readv                /* 145 */
1203         .long _sys_writev
1204         .long _sys_getsid
1205         .long _sys_fdatasync
1206         .long _sys_sysctl
1207         .long _sys_ni_syscall   /* 150 */ /* sys_mlock */
1208         .long _sys_ni_syscall   /* sys_munlock */
1209         .long _sys_ni_syscall   /* sys_mlockall */
1210         .long _sys_ni_syscall   /* sys_munlockall */
1211         .long _sys_sched_setparam
1212         .long _sys_sched_getparam /* 155 */
1213         .long _sys_sched_setscheduler
1214         .long _sys_sched_getscheduler
1215         .long _sys_sched_yield
1216         .long _sys_sched_get_priority_max
1217         .long _sys_sched_get_priority_min  /* 160 */
1218         .long _sys_sched_rr_get_interval
1219         .long _sys_nanosleep
1220         .long _sys_mremap
1221         .long _sys_setresuid    /* setresuid16 */
1222         .long _sys_getresuid    /* getresuid16 */       /* 165 */
1223         .long _sys_ni_syscall   /* for vm86 */
1224         .long _sys_ni_syscall   /* old "query_module" */
1225         .long _sys_ni_syscall   /* sys_poll */
1226         .long _sys_nfsservctl
1227         .long _sys_setresgid    /* setresgid16 */       /* 170 */
1228         .long _sys_getresgid    /* getresgid16 */
1229         .long _sys_prctl
1230         .long _sys_rt_sigreturn
1231         .long _sys_rt_sigaction
1232         .long _sys_rt_sigprocmask /* 175 */
1233         .long _sys_rt_sigpending
1234         .long _sys_rt_sigtimedwait
1235         .long _sys_rt_sigqueueinfo
1236         .long _sys_rt_sigsuspend
1237         .long _sys_pread64      /* 180 */
1238         .long _sys_pwrite64
1239         .long _sys_lchown       /* lchown16 */
1240         .long _sys_getcwd
1241         .long _sys_capget
1242         .long _sys_capset       /* 185 */
1243         .long _sys_sigaltstack
1244         .long _sys_sendfile
1245         .long _sys_ni_syscall   /* streams1 */
1246         .long _sys_ni_syscall   /* streams2 */
1247         .long _sys_vfork                /* 190 */
1248         .long _sys_getrlimit
1249         .long _sys_mmap2
1250         .long _sys_truncate64
1251         .long _sys_ftruncate64
1252         .long _sys_stat64       /* 195 */
1253         .long _sys_lstat64
1254         .long _sys_fstat64
1255         .long _sys_chown
1256         .long _sys_getuid
1257         .long _sys_getgid       /* 200 */
1258         .long _sys_geteuid
1259         .long _sys_getegid
1260         .long _sys_setreuid
1261         .long _sys_setregid
1262         .long _sys_getgroups    /* 205 */
1263         .long _sys_setgroups
1264         .long _sys_fchown
1265         .long _sys_setresuid
1266         .long _sys_getresuid
1267         .long _sys_setresgid    /* 210 */
1268         .long _sys_getresgid
1269         .long _sys_lchown
1270         .long _sys_setuid
1271         .long _sys_setgid
1272         .long _sys_setfsuid     /* 215 */
1273         .long _sys_setfsgid
1274         .long _sys_pivot_root
1275         .long _sys_ni_syscall   /* sys_mincore */
1276         .long _sys_ni_syscall   /* sys_madvise */
1277         .long _sys_getdents64   /* 220 */
1278         .long _sys_fcntl64
1279         .long _sys_ni_syscall   /* reserved for TUX */
1280         .long _sys_ni_syscall
1281         .long _sys_gettid
1282         .long _sys_readahead    /* 225 */
1283         .long _sys_setxattr
1284         .long _sys_lsetxattr
1285         .long _sys_fsetxattr
1286         .long _sys_getxattr
1287         .long _sys_lgetxattr    /* 230 */
1288         .long _sys_fgetxattr
1289         .long _sys_listxattr
1290         .long _sys_llistxattr
1291         .long _sys_flistxattr
1292         .long _sys_removexattr  /* 235 */
1293         .long _sys_lremovexattr
1294         .long _sys_fremovexattr
1295         .long _sys_tkill
1296         .long _sys_sendfile64
1297         .long _sys_futex                /* 240 */
1298         .long _sys_sched_setaffinity
1299         .long _sys_sched_getaffinity
1300         .long _sys_ni_syscall   /* sys_set_thread_area */
1301         .long _sys_ni_syscall   /* sys_get_thread_area */
1302         .long _sys_io_setup     /* 245 */
1303         .long _sys_io_destroy
1304         .long _sys_io_getevents
1305         .long _sys_io_submit
1306         .long _sys_io_cancel
1307         .long _sys_ni_syscall   /* 250 */ /* sys_alloc_hugepages */
1308         .long _sys_ni_syscall   /* sys_freec_hugepages */
1309         .long _sys_exit_group
1310         .long _sys_lookup_dcookie
1311         .long _sys_bfin_spinlock
1312         .long _sys_epoll_create /* 255 */
1313         .long _sys_epoll_ctl
1314         .long _sys_epoll_wait
1315         .long _sys_ni_syscall /* remap_file_pages */
1316         .long _sys_set_tid_address
1317         .long _sys_timer_create /* 260 */
1318         .long _sys_timer_settime
1319         .long _sys_timer_gettime
1320         .long _sys_timer_getoverrun
1321         .long _sys_timer_delete
1322         .long _sys_clock_settime /* 265 */
1323         .long _sys_clock_gettime
1324         .long _sys_clock_getres
1325         .long _sys_clock_nanosleep
1326         .long _sys_statfs64
1327         .long _sys_fstatfs64    /* 270 */
1328         .long _sys_tgkill
1329         .long _sys_utimes
1330         .long _sys_fadvise64_64
1331         .long _sys_ni_syscall /* vserver */
1332         .long _sys_ni_syscall /* 275, mbind */
1333         .long _sys_ni_syscall /* get_mempolicy */
1334         .long _sys_ni_syscall /* set_mempolicy */
1335         .long _sys_mq_open
1336         .long _sys_mq_unlink
1337         .long _sys_mq_timedsend /* 280 */
1338         .long _sys_mq_timedreceive
1339         .long _sys_mq_notify
1340         .long _sys_mq_getsetattr
1341         .long _sys_ni_syscall /* kexec_load */
1342         .long _sys_waitid       /* 285 */
1343         .long _sys_add_key
1344         .long _sys_request_key
1345         .long _sys_keyctl
1346         .long _sys_ioprio_set
1347         .long _sys_ioprio_get   /* 290 */
1348         .long _sys_inotify_init
1349         .long _sys_inotify_add_watch
1350         .long _sys_inotify_rm_watch
1351         .long _sys_ni_syscall /* migrate_pages */
1352         .long _sys_openat       /* 295 */
1353         .long _sys_mkdirat
1354         .long _sys_mknodat
1355         .long _sys_fchownat
1356         .long _sys_futimesat
1357         .long _sys_fstatat64    /* 300 */
1358         .long _sys_unlinkat
1359         .long _sys_renameat
1360         .long _sys_linkat
1361         .long _sys_symlinkat
1362         .long _sys_readlinkat   /* 305 */
1363         .long _sys_fchmodat
1364         .long _sys_faccessat
1365         .long _sys_pselect6
1366         .long _sys_ppoll
1367         .long _sys_unshare      /* 310 */
1368         .long _sys_sram_alloc
1369         .long _sys_sram_free
1370         .long _sys_dma_memcpy
1371         .long _sys_accept
1372         .long _sys_bind         /* 315 */
1373         .long _sys_connect
1374         .long _sys_getpeername
1375         .long _sys_getsockname
1376         .long _sys_getsockopt
1377         .long _sys_listen       /* 320 */
1378         .long _sys_recv
1379         .long _sys_recvfrom
1380         .long _sys_recvmsg
1381         .long _sys_send
1382         .long _sys_sendmsg      /* 325 */
1383         .long _sys_sendto
1384         .long _sys_setsockopt
1385         .long _sys_shutdown
1386         .long _sys_socket
1387         .long _sys_socketpair   /* 330 */
1388         .long _sys_semctl
1389         .long _sys_semget
1390         .long _sys_semop
1391         .long _sys_msgctl
1392         .long _sys_msgget       /* 335 */
1393         .long _sys_msgrcv
1394         .long _sys_msgsnd
1395         .long _sys_shmat
1396         .long _sys_shmctl
1397         .long _sys_shmdt        /* 340 */
1398         .long _sys_shmget
1399         .long _sys_splice
1400         .long _sys_sync_file_range
1401         .long _sys_tee
1402         .long _sys_vmsplice     /* 345 */
1403         .long _sys_epoll_pwait
1404         .long _sys_utimensat
1405         .long _sys_signalfd
1406         .long _sys_timerfd_create
1407         .long _sys_eventfd      /* 350 */
1408         .long _sys_pread64
1409         .long _sys_pwrite64
1410         .long _sys_fadvise64
1411         .long _sys_set_robust_list
1412         .long _sys_get_robust_list      /* 355 */
1413         .long _sys_fallocate
1414         .long _sys_semtimedop
1415         .long _sys_timerfd_settime
1416         .long _sys_timerfd_gettime
1417
1418         .rept NR_syscalls-(.-_sys_call_table)/4
1419         .long _sys_ni_syscall
1420         .endr
1421
1422         /*
1423          * Used to save the real RETX, IMASK and SYSCFG when temporarily
1424          * storing safe values across the transition from exception to IRQ5.
1425          */
1426 _excpt_saved_stuff:
1427         .long 0;
1428         .long 0;
1429         .long 0;
1430
1431 _exception_stack:
1432         .rept 1024
1433         .long 0;
1434         .endr
1435 _exception_stack_top:
1436
1437 #if ANOMALY_05000261
1438 /* Used by the assembly entry point to work around an anomaly.  */
1439 _last_cplb_fault_retx:
1440         .long 0;
1441 #endif