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/thread_info.h>  /* TIF_NEED_RESCHED */
  42 #include <asm/asm-offsets.h>
  43 #include <asm/trace.h>
  44
  45 #include <asm/mach-common/context.S>
  46
  47 #if defined(CONFIG_BFIN_SCRATCH_REG_RETN)
  48 # define EX_SCRATCH_REG RETN
  49 #elif defined(CONFIG_BFIN_SCRATCH_REG_RETE)
  50 # define EX_SCRATCH_REG RETE
  51 #else
  52 # define EX_SCRATCH_REG CYCLES
  53 #endif
  54
  55 #if ANOMALY_05000281
  56 ENTRY(_safe_speculative_execution)
  57         NOP;
  58         NOP;
  59         NOP;
  60         jump _safe_speculative_execution;
  61 ENDPROC(_safe_speculative_execution)
  62 #endif
  63
  64 #ifdef CONFIG_EXCPT_IRQ_SYSC_L1
  65 .section .l1.text
  66 #else
  67 .text
  68 #endif
  69
  70 /* Slightly simplified and streamlined entry point for CPLB misses.
  71  * This one does not lower the level to IRQ5, and thus can be used to
  72  * patch up CPLB misses on the kernel stack.
  73  */
  74 #if ANOMALY_05000261
  75 #define _ex_dviol _ex_workaround_261
  76 #define _ex_dmiss _ex_workaround_261
  77 #define _ex_dmult _ex_workaround_261
  78
  79 ENTRY(_ex_workaround_261)
  80         /*
  81          * Work around an anomaly: if we see a new DCPLB fault, return
  82          * without doing anything.  Then, if we get the same fault again,
  83          * handle it.
  84          */
  85         P4 = R7;        /* Store EXCAUSE */
  86         p5.l = _last_cplb_fault_retx;
  87         p5.h = _last_cplb_fault_retx;
  88         r7 = [p5];
  89         r6 = retx;
  90         [p5] = r6;
  91         cc = r6 == r7;
  92         if !cc jump _bfin_return_from_exception;
  93         /* fall through */
  94         R7 = P4;
  95         R6 = 0x26;      /* Data CPLB Miss */
  96         cc = R6 == R7;
  97         if cc jump _ex_dcplb_miss (BP);
  98         R6 = 0x23;      /* Data CPLB Miss */
  99         cc = R6 == R7;
 100         if cc jump _ex_dcplb_viol (BP);
 101         /* Handle 0x23 Data CPLB Protection Violation
 102          * and Data CPLB Multiple Hits - Linux Trap Zero
 103          */
 104         jump _ex_trap_c;
 105 ENDPROC(_ex_workaround_261)
 106
 107 #else
 108 #ifdef CONFIG_MPU
 109 #define _ex_dviol _ex_dcplb_viol
 110 #else
 111 #define _ex_dviol _ex_trap_c
 112 #endif
 113 #define _ex_dmiss _ex_dcplb_miss
 114 #define _ex_dmult _ex_trap_c
 115 #endif
 116
 117
 118 ENTRY(_ex_dcplb_viol)
 119 ENTRY(_ex_dcplb_miss)
 120 ENTRY(_ex_icplb_miss)
 121         (R7:6,P5:4) = [sp++];
 122         ASTAT = [sp++];
 123         SAVE_ALL_SYS
 124 #ifdef CONFIG_MPU
 125         R0 = SEQSTAT;
 126         R1 = SP;
 127         sp += -12;
 128         call _cplb_hdr;
 129         sp += 12;
 130         CC = R0 == 0;
 131         IF !CC JUMP _handle_bad_cplb;
 132 #else
 133         call __cplb_hdr;
 134 #endif
 135         DEBUG_START_HWTRACE(p5, r7)
 136         RESTORE_ALL_SYS
 137         SP = EX_SCRATCH_REG;
 138         rtx;
 139 ENDPROC(_ex_icplb_miss)
 140
 141 ENTRY(_ex_syscall)
 142         DEBUG_START_HWTRACE(p5, r7)
 143         (R7:6,P5:4) = [sp++];
 144         ASTAT = [sp++];
 145         raise 15;               /* invoked by TRAP #0, for sys call */
 146         sp = EX_SCRATCH_REG;
 147         rtx
 148 ENDPROC(_ex_syscall)
 149
 150 ENTRY(_ex_soft_bp)
 151         r7 = retx;
 152         r7 += -2;
 153         retx = r7;
 154         jump.s _ex_trap_c;
 155 ENDPROC(_ex_soft_bp)
 156
 157 ENTRY(_ex_single_step)
 158         r7 = retx;
 159         r6 = reti;
 160         cc = r7 == r6;
 161         if cc jump _bfin_return_from_exception
 162         r7 = syscfg;
 163         bitclr (r7, 0);
 164         syscfg = R7;
 165
 166         p5.l = lo(IPEND);
 167         p5.h = hi(IPEND);
 168         r6 = [p5];
 169         cc = bittst(r6, 5);
 170         if !cc jump _ex_trap_c;
 171         p4.l = lo(EVT5);
 172         p4.h = hi(EVT5);
 173         r6.h = _exception_to_level5;
 174         r6.l = _exception_to_level5;
 175         r7 = [p4];
 176         cc = r6 == r7;
 177         if !cc jump _ex_trap_c;
 178 ENDPROC(_ex_single_step)
 179
 180 ENTRY(_bfin_return_from_exception)
 181         DEBUG_START_HWTRACE(p5, r7)
 182 #if ANOMALY_05000257
 183         R7=LC0;
 184         LC0=R7;
 185         R7=LC1;
 186         LC1=R7;
 187 #endif
 188         (R7:6,P5:4) = [sp++];
 189         ASTAT = [sp++];
 190         sp = EX_SCRATCH_REG;
 191         rtx;
 192 ENDPROC(_bfin_return_from_exception)
 193
 194 ENTRY(_handle_bad_cplb)
 195         /* To get here, we just tried and failed to change a CPLB
 196          * so, handle things in trap_c (C code), by lowering to
 197          * IRQ5, just like we normally do. Since this is not a
 198          * "normal" return path, we have a do alot of stuff to
 199          * the stack to get ready so, we can fall through - we
 200          * need to make a CPLB exception look like a normal exception
 201          */
 202
 203         DEBUG_START_HWTRACE(p5, r7)
 204         RESTORE_ALL_SYS
 205         [--sp] = ASTAT;
 206         [--sp] = (R7:6, P5:4);
 207
 208 ENTRY(_ex_replaceable)
 209         nop;
 210
 211 ENTRY(_ex_trap_c)
 212         /* Make sure we are not in a double fault */
 213         p4.l = lo(IPEND);
 214         p4.h = hi(IPEND);
 215         r7 = [p4];
 216         CC = BITTST (r7, 5);
 217         if CC jump _double_fault;
 218
 219         /* Call C code (trap_c) to handle the exception, which most
 220          * likely involves sending a signal to the current process.
 221          * To avoid double faults, lower our priority to IRQ5 first.
 222          */
 223         P5.h = _exception_to_level5;
 224         P5.l = _exception_to_level5;
 225         p4.l = lo(EVT5);
 226         p4.h = hi(EVT5);
 227         [p4] = p5;
 228         csync;
 229
 230         /* Disable all interrupts, but make sure level 5 is enabled so
 231          * we can switch to that level.  Save the old mask.  */
 232         cli r6;
 233         p4.l = _excpt_saved_imask;
 234         p4.h = _excpt_saved_imask;
 235         [p4] = r6;
 236         r6 = 0x3f;
 237         sti r6;
 238
 239         /* Save the excause into a circular buffer, in case the instruction
 240          * which caused this excecptions causes others.
 241          */
 242         P5.l = _in_ptr_excause;
 243         P5.h = _in_ptr_excause;
 244         R7 = [P5];
 245         R7 += 4;
 246         R6 = 0xF;
 247         R7 = R7 & R6;
 248         [P5] = R7;
 249         R6.l = _excause_circ_buf;
 250         R6.h = _excause_circ_buf;
 251         R7 = R7 + R6;
 252         p5 = R7;
 253         R6 = SEQSTAT;
 254         [P5] = R6;
 255
 256         DEBUG_START_HWTRACE(p5, r7)
 257         (R7:6,P5:4) = [sp++];
 258         ASTAT = [sp++];
 259         SP = EX_SCRATCH_REG;
 260         raise 5;
 261         rtx;
 262 ENDPROC(_ex_trap_c)
 263
 264 /* We just realized we got an exception, while we were processing a different
 265  * exception. This is a unrecoverable event, so crash
 266  */
 267 ENTRY(_double_fault)
 268         /* Turn caches & protection off, to ensure we don't get any more
 269          * double exceptions
 270          */
 271
 272         P4.L = LO(IMEM_CONTROL);
 273         P4.H = HI(IMEM_CONTROL);
 274
 275         R5 = [P4];              /* Control Register*/
 276         BITCLR(R5,ENICPLB_P);
 277         SSYNC;          /* SSYNC required before writing to IMEM_CONTROL. */
 278         .align 8;
 279         [P4] = R5;
 280         SSYNC;
 281
 282         P4.L = LO(DMEM_CONTROL);
 283         P4.H = HI(DMEM_CONTROL);
 284         R5 = [P4];
 285         BITCLR(R5,ENDCPLB_P);
 286         SSYNC;          /* SSYNC required before writing to DMEM_CONTROL. */
 287         .align 8;
 288         [P4] = R5;
 289         SSYNC;
 290
 291         /* Fix up the stack */
 292         (R7:6,P5:4) = [sp++];
 293         ASTAT = [sp++];
 294         SP = EX_SCRATCH_REG;
 295
 296         /* We should be out of the exception stack, and back down into
 297          * kernel or user space stack
 298          */
 299         SAVE_ALL_SYS
 300
 301         r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
 302         SP += -12;
 303         call _double_fault_c;
 304         SP += 12;
 305 .L_double_fault_panic:
 306         JUMP .L_double_fault_panic
 307
 308 ENDPROC(_double_fault)
 309
 310 ENTRY(_exception_to_level5)
 311         SAVE_ALL_SYS
 312
 313         /* Restore interrupt mask.  We haven't pushed RETI, so this
 314          * doesn't enable interrupts until we return from this handler.  */
 315         p4.l = _excpt_saved_imask;
 316         p4.h = _excpt_saved_imask;
 317         r6 = [p4];
 318         sti r6;
 319
 320         /* Restore the hardware error vector.  */
 321         P5.h = _evt_ivhw;
 322         P5.l = _evt_ivhw;
 323         p4.l = lo(EVT5);
 324         p4.h = hi(EVT5);
 325         [p4] = p5;
 326         csync;
 327
 328         p2.l = lo(IPEND);
 329         p2.h = hi(IPEND);
 330         csync;
 331         r0 = [p2];              /* Read current IPEND */
 332         [sp + PT_IPEND] = r0;   /* Store IPEND */
 333
 334         /* Pop the excause from the circular buffer and push it on the stack
 335          * (in the right place - if you change the location of SEQSTAT, you
 336          * must change this offset.
 337          */
 338 .L_excep_to_5_again:
 339         P5.l = _out_ptr_excause;
 340         P5.h = _out_ptr_excause;
 341         R7 = [P5];
 342         R7 += 4;
 343         R6 = 0xF;
 344         R7 = R7 & R6;
 345         [P5] = R7;
 346         R6.l = _excause_circ_buf;
 347         R6.h = _excause_circ_buf;
 348         R7 = R7 + R6;
 349         P5 = R7;
 350         R1 = [P5];
 351         [SP + PT_SEQSTAT] = r1;
 352
 353         r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
 354         SP += -12;
 355         call _trap_c;
 356         SP += 12;
 357
 358         /* See if anything else is in the exception buffer
 359          * if there is, process it
 360          */
 361         P5.l = _out_ptr_excause;
 362         P5.h = _out_ptr_excause;
 363         P4.l = _in_ptr_excause;
 364         P4.h = _in_ptr_excause;
 365         R6 = [P5];
 366         R7 = [P4];
 367         CC = R6 == R7;
 368         if ! CC JUMP .L_excep_to_5_again
 369
 370         call _ret_from_exception;
 371         RESTORE_ALL_SYS
 372         rti;
 373 ENDPROC(_exception_to_level5)
 374
 375 ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
 376         /* Since the kernel stack can be anywhere, it's not guaranteed to be
 377          * covered by a CPLB.  Switch to an exception stack; use RETN as a
 378          * scratch register (for want of a better option).
 379          */
 380         EX_SCRATCH_REG = sp;
 381         sp.l = _exception_stack_top;
 382         sp.h = _exception_stack_top;
 383         /* Try to deal with syscalls quickly.  */
 384         [--sp] = ASTAT;
 385         [--sp] = (R7:6, P5:4);
 386         DEBUG_STOP_HWTRACE(p5, r7)
 387         r7 = SEQSTAT;           /* reason code is in bit 5:0 */
 388         r6.l = lo(SEQSTAT_EXCAUSE);
 389         r6.h = hi(SEQSTAT_EXCAUSE);
 390         r7 = r7 & r6;
 391         p5.h = _ex_table;
 392         p5.l = _ex_table;
 393         p4 = r7;
 394         p5 = p5 + (p4 << 2);
 395         p4 = [p5];
 396         jump (p4);
 397
 398 .Lbadsys:
 399         r7 = -ENOSYS;           /* signextending enough */
 400         [sp + PT_R0] = r7;      /* return value from system call */
 401         jump .Lsyscall_really_exit;
 402 ENDPROC(_trap)
 403
 404 ENTRY(_kernel_execve)
 405         link SIZEOF_PTREGS;
 406         p0 = sp;
 407         r3 = SIZEOF_PTREGS / 4;
 408         r4 = 0(x);
 409 0:
 410         [p0++] = r4;
 411         r3 += -1;
 412         cc = r3 == 0;
 413         if !cc jump 0b (bp);
 414
 415         p0 = sp;
 416         sp += -16;
 417         [sp + 12] = p0;
 418         call _do_execve;
 419         SP += 16;
 420         cc = r0 == 0;
 421         if ! cc jump 1f;
 422         /* Success.  Copy our temporary pt_regs to the top of the kernel
 423          * stack and do a normal exception return.
 424          */
 425         r1 = sp;
 426         r0 = (-KERNEL_STACK_SIZE) (x);
 427         r1 = r1 & r0;
 428         p2 = r1;
 429         p3 = [p2];
 430         r0 = KERNEL_STACK_SIZE - 4 (z);
 431         p1 = r0;
 432         p1 = p1 + p2;
 433
 434         p0 = fp;
 435         r4 = [p0--];
 436         r3 = SIZEOF_PTREGS / 4;
 437 0:
 438         r4 = [p0--];
 439         [p1--] = r4;
 440         r3 += -1;
 441         cc = r3 == 0;
 442         if ! cc jump 0b (bp);
 443
 444         r0 = (KERNEL_STACK_SIZE - SIZEOF_PTREGS) (z);
 445         p1 = r0;
 446         p1 = p1 + p2;
 447         sp = p1;
 448         r0 = syscfg;
 449         [SP + PT_SYSCFG] = r0;
 450         [p3 + (TASK_THREAD + THREAD_KSP)] = sp;
 451
 452         RESTORE_CONTEXT;
 453         rti;
 454 1:
 455         unlink;
 456         rts;
 457 ENDPROC(_kernel_execve)
 458
 459 ENTRY(_system_call)
 460         /* Store IPEND */
 461         p2.l = lo(IPEND);
 462         p2.h = hi(IPEND);
 463         csync;
 464         r0 = [p2];
 465         [sp + PT_IPEND] = r0;
 466
 467         /* Store RETS for now */
 468         r0 = rets;
 469         [sp + PT_RESERVED] = r0;
 470         /* Set the stack for the current process */
 471         r7 = sp;
 472         r6.l = lo(ALIGN_PAGE_MASK);
 473         r6.h = hi(ALIGN_PAGE_MASK);
 474         r7 = r7 & r6;           /* thread_info */
 475         p2 = r7;
 476         p2 = [p2];
 477
 478         [p2+(TASK_THREAD+THREAD_KSP)] = sp;
 479
 480         /* Check the System Call */
 481         r7 = __NR_syscall;
 482         /* System call number is passed in P0 */
 483         r6 = p0;
 484         cc = r6 < r7;
 485         if ! cc jump .Lbadsys;
 486
 487         /* are we tracing syscalls?*/
 488         r7 = sp;
 489         r6.l = lo(ALIGN_PAGE_MASK);
 490         r6.h = hi(ALIGN_PAGE_MASK);
 491         r7 = r7 & r6;
 492         p2 = r7;
 493         r7 = [p2+TI_FLAGS];
 494         CC = BITTST(r7,TIF_SYSCALL_TRACE);
 495         if CC JUMP _sys_trace;
 496
 497         /* Execute the appropriate system call */
 498
 499         p4 = p0;
 500         p5.l = _sys_call_table;
 501         p5.h = _sys_call_table;
 502         p5 = p5 + (p4 << 2);
 503         r0 = [sp + PT_R0];
 504         r1 = [sp + PT_R1];
 505         r2 = [sp + PT_R2];
 506         p5 = [p5];
 507
 508         [--sp] = r5;
 509         [--sp] = r4;
 510         [--sp] = r3;
 511         SP += -12;
 512         call (p5);
 513         SP += 24;
 514         [sp + PT_R0] = r0;
 515
 516 .Lresume_userspace:
 517         r7 = sp;
 518         r4.l = lo(ALIGN_PAGE_MASK);
 519         r4.h = hi(ALIGN_PAGE_MASK);
 520         r7 = r7 & r4;           /* thread_info->flags */
 521         p5 = r7;
 522 .Lresume_userspace_1:
 523         /* Disable interrupts.  */
 524         [--sp] = reti;
 525         reti = [sp++];
 526
 527         r7 = [p5 + TI_FLAGS];
 528         r4.l = lo(_TIF_WORK_MASK);
 529         r4.h = hi(_TIF_WORK_MASK);
 530         r7 =  r7 & r4;
 531
 532 .Lsyscall_resched:
 533         cc = BITTST(r7, TIF_NEED_RESCHED);
 534         if !cc jump .Lsyscall_sigpending;
 535
 536         /* Reenable interrupts.  */
 537         [--sp] = reti;
 538         r0 = [sp++];
 539
 540         SP += -12;
 541         call _schedule;
 542         SP += 12;
 543
 544         jump .Lresume_userspace_1;
 545
 546 .Lsyscall_sigpending:
 547         cc = BITTST(r7, TIF_RESTORE_SIGMASK);
 548         if cc jump .Lsyscall_do_signals;
 549         cc = BITTST(r7, TIF_SIGPENDING);
 550         if !cc jump .Lsyscall_really_exit;
 551 .Lsyscall_do_signals:
 552         /* Reenable interrupts.  */
 553         [--sp] = reti;
 554         r0 = [sp++];
 555
 556         r0 = sp;
 557         SP += -12;
 558         call _do_signal;
 559         SP += 12;
 560
 561 .Lsyscall_really_exit:
 562         r5 = [sp + PT_RESERVED];
 563         rets = r5;
 564         rts;
 565 ENDPROC(_system_call)
 566
 567 _sys_trace:
 568         call _syscall_trace;
 569
 570         /* Execute the appropriate system call */
 571
 572         p4 = [SP + PT_P0];
 573         p5.l = _sys_call_table;
 574         p5.h = _sys_call_table;
 575         p5 = p5 + (p4 << 2);
 576         r0 = [sp + PT_R0];
 577         r1 = [sp + PT_R1];
 578         r2 = [sp + PT_R2];
 579         r3 = [sp + PT_R3];
 580         r4 = [sp + PT_R4];
 581         r5 = [sp + PT_R5];
 582         p5 = [p5];
 583
 584         [--sp] = r5;
 585         [--sp] = r4;
 586         [--sp] = r3;
 587         SP += -12;
 588         call (p5);
 589         SP += 24;
 590         [sp + PT_R0] = r0;
 591
 592         call _syscall_trace;
 593         jump .Lresume_userspace;
 594 ENDPROC(_sys_trace)
 595
 596 ENTRY(_resume)
 597         /*
 598          * Beware - when entering resume, prev (the current task) is
 599          * in r0, next (the new task) is in r1.
 600          */
 601         p0 = r0;
 602         p1 = r1;
 603         [--sp] = rets;
 604         [--sp] = fp;
 605         [--sp] = (r7:4, p5:3);
 606
 607         /* save usp */
 608         p2 = usp;
 609         [p0+(TASK_THREAD+THREAD_USP)] = p2;
 610
 611         /* save current kernel stack pointer */
 612         [p0+(TASK_THREAD+THREAD_KSP)] = sp;
 613
 614         /* save program counter */
 615         r1.l = _new_old_task;
 616         r1.h = _new_old_task;
 617         [p0+(TASK_THREAD+THREAD_PC)] = r1;
 618
 619         /* restore the kernel stack pointer */
 620         sp = [p1+(TASK_THREAD+THREAD_KSP)];
 621
 622         /* restore user stack pointer */
 623         p0 = [p1+(TASK_THREAD+THREAD_USP)];
 624         usp = p0;
 625
 626         /* restore pc */
 627         p0 = [p1+(TASK_THREAD+THREAD_PC)];
 628         jump (p0);
 629
 630         /*
 631          * Following code actually lands up in a new (old) task.
 632          */
 633
 634 _new_old_task:
 635         (r7:4, p5:3) = [sp++];
 636         fp = [sp++];
 637         rets = [sp++];
 638
 639         /*
 640          * When we come out of resume, r0 carries "old" task, becuase we are
 641          * in "new" task.
 642          */
 643         rts;
 644 ENDPROC(_resume)
 645
 646 ENTRY(_ret_from_exception)
 647         p2.l = lo(IPEND);
 648         p2.h = hi(IPEND);
 649
 650         csync;
 651         r0 = [p2];
 652         [sp + PT_IPEND] = r0;
 653
 654 1:
 655         r2 = LO(~0x37) (Z);
 656         r0 = r2 & r0;
 657         cc = r0 == 0;
 658         if !cc jump 4f; /* if not return to user mode, get out */
 659
 660         /* Make sure any pending system call or deferred exception
 661          * return in ILAT for this process to get executed, otherwise
 662          * in case context switch happens, system call of
 663          * first process (i.e in ILAT) will be carried
 664          * forward to the switched process
 665          */
 666
 667         p2.l = lo(ILAT);
 668         p2.h = hi(ILAT);
 669         r0 = [p2];
 670         r1 = (EVT_IVG14 | EVT_IVG15) (z);
 671         r0 = r0 & r1;
 672         cc = r0 == 0;
 673         if !cc jump 5f;
 674
 675         /* Set the stack for the current process */
 676         r7 = sp;
 677         r4.l = lo(ALIGN_PAGE_MASK);
 678         r4.h = hi(ALIGN_PAGE_MASK);
 679         r7 = r7 & r4;           /* thread_info->flags */
 680         p5 = r7;
 681         r7 = [p5 + TI_FLAGS];
 682         r4.l = lo(_TIF_WORK_MASK);
 683         r4.h = hi(_TIF_WORK_MASK);
 684         r7 =  r7 & r4;
 685         cc = r7 == 0;
 686         if cc jump 4f;
 687
 688         p0.l = lo(EVT15);
 689         p0.h = hi(EVT15);
 690         p1.l = _schedule_and_signal;
 691         p1.h = _schedule_and_signal;
 692         [p0] = p1;
 693         csync;
 694         raise 15;               /* raise evt14 to do signal or reschedule */
 695 4:
 696         r0 = syscfg;
 697         bitclr(r0, 0);
 698         syscfg = r0;
 699 5:
 700         rts;
 701 ENDPROC(_ret_from_exception)
 702
 703 ENTRY(_return_from_int)
 704         /* If someone else already raised IRQ 15, do nothing.  */
 705         csync;
 706         p2.l = lo(ILAT);
 707         p2.h = hi(ILAT);
 708         r0 = [p2];
 709         cc = bittst (r0, EVT_IVG15_P);
 710         if cc jump 2f;
 711
 712         /* if not return to user mode, get out */
 713         p2.l = lo(IPEND);
 714         p2.h = hi(IPEND);
 715         r0 = [p2];
 716         r1 = 0x17(Z);
 717         r2 = ~r1;
 718         r2.h = 0;
 719         r0 = r2 & r0;
 720         r1 = 1;
 721         r1 = r0 - r1;
 722         r2 = r0 & r1;
 723         cc = r2 == 0;
 724         if !cc jump 2f;
 725
 726         /* Lower the interrupt level to 15.  */
 727         p0.l = lo(EVT15);
 728         p0.h = hi(EVT15);
 729         p1.l = _schedule_and_signal_from_int;
 730         p1.h = _schedule_and_signal_from_int;
 731         [p0] = p1;
 732         csync;
 733 #if ANOMALY_05000281
 734         r0.l = _safe_speculative_execution;
 735         r0.h = _safe_speculative_execution;
 736         reti = r0;
 737 #endif
 738         r0 = 0x801f (z);
 739         STI r0;
 740         raise 15;       /* raise evt15 to do signal or reschedule */
 741         rti;
 742 2:
 743         rts;
 744 ENDPROC(_return_from_int)
 745
 746 ENTRY(_lower_to_irq14)
 747 #if ANOMALY_05000281
 748         r0.l = _safe_speculative_execution;
 749         r0.h = _safe_speculative_execution;
 750         reti = r0;
 751 #endif
 752         r0 = 0x401f;
 753         sti r0;
 754         raise 14;
 755         rti;
 756 ENTRY(_evt14_softirq)
 757 #ifdef CONFIG_DEBUG_HWERR
 758         r0 = 0x3f;
 759         sti r0;
 760 #else
 761         cli r0;
 762 #endif
 763         [--sp] = RETI;
 764         SP += 4;
 765         rts;
 766
 767 _schedule_and_signal_from_int:
 768         /* To end up here, vector 15 was changed - so we have to change it
 769          * back.
 770          */
 771         p0.l = lo(EVT15);
 772         p0.h = hi(EVT15);
 773         p1.l = _evt_system_call;
 774         p1.h = _evt_system_call;
 775         [p0] = p1;
 776         csync;
 777
 778         /* Set orig_p0 to -1 to indicate this isn't the end of a syscall.  */
 779         r0 = -1 (x);
 780         [sp + PT_ORIG_P0] = r0;
 781
 782         p1 = rets;
 783         [sp + PT_RESERVED] = p1;
 784
 785         p0.l = _irq_flags;
 786         p0.h = _irq_flags;
 787         r0 = [p0];
 788         sti r0;
 789
 790         r0 = sp;
 791         sp += -12;
 792         call _finish_atomic_sections;
 793         sp += 12;
 794         jump.s .Lresume_userspace;
 795
 796 _schedule_and_signal:
 797         SAVE_CONTEXT_SYSCALL
 798         /* To end up here, vector 15 was changed - so we have to change it
 799          * back.
 800          */
 801         p0.l = lo(EVT15);
 802         p0.h = hi(EVT15);
 803         p1.l = _evt_system_call;
 804         p1.h = _evt_system_call;
 805         [p0] = p1;
 806         csync;
 807         p0.l = 1f;
 808         p0.h = 1f;
 809         [sp + PT_RESERVED] = P0;
 810         call .Lresume_userspace;
 811 1:
 812         RESTORE_CONTEXT
 813         rti;
 814 ENDPROC(_lower_to_irq14)
 815
 816 /* Make sure when we start, that the circular buffer is initialized properly
 817  * R0 and P0 are call clobbered, so we can use them here.
 818  */
 819 ENTRY(_init_exception_buff)
 820         r0 = 0;
 821         p0.h = _in_ptr_excause;
 822         p0.l = _in_ptr_excause;
 823         [p0] = r0;
 824         p0.h = _out_ptr_excause;
 825         p0.l = _out_ptr_excause;
 826         [p0] = r0;
 827         rts;
 828 ENDPROC(_init_exception_buff)
 829
 830 /* We handle this 100% in exception space - to reduce overhead
 831  * Only potiential problem is if the software buffer gets swapped out of the
 832  * CPLB table - then double fault. - so we don't let this happen in other places
 833  */
 834 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 835 ENTRY(_ex_trace_buff_full)
 836         [--sp] = P3;
 837         [--sp] = P2;
 838         [--sp] = LC0;
 839         [--sp] = LT0;
 840         [--sp] = LB0;
 841         P5.L = _trace_buff_offset;
 842         P5.H = _trace_buff_offset;
 843         P3 = [P5];              /* trace_buff_offset */
 844         P5.L = lo(TBUFSTAT);
 845         P5.H = hi(TBUFSTAT);
 846         R7 = [P5];
 847         R7 <<= 1;               /* double, since we need to read twice */
 848         LC0 = R7;
 849         R7 <<= 2;               /* need to shift over again,
 850                                  * to get the number of bytes */
 851         P5.L = lo(TBUF);
 852         P5.H = hi(TBUF);
 853         R6 = ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*1024) - 1;
 854
 855         P2 = R7;
 856         P3 = P3 + P2;
 857         R7 = P3;
 858         R7 = R7 & R6;
 859         P3 = R7;
 860         P2.L = _trace_buff_offset;
 861         P2.H = _trace_buff_offset;
 862         [P2] = P3;
 863
 864         P2.L = _software_trace_buff;
 865         P2.H = _software_trace_buff;
 866
 867         LSETUP (.Lstart, .Lend) LC0;
 868 .Lstart:
 869         R7 = [P5];      /* read TBUF */
 870         P4 = P3 + P2;
 871         [P4] = R7;
 872         P3 += -4;
 873         R7 = P3;
 874         R7 = R7 & R6;
 875 .Lend:
 876         P3 = R7;
 877
 878         LB0 = [sp++];
 879         LT0 = [sp++];
 880         LC0 = [sp++];
 881         P2 = [sp++];
 882         P3 = [sp++];
 883         jump _bfin_return_from_exception;
 884 ENDPROC(_ex_trace_buff_full)
 885
 886 #if CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN == 4
 887 .data
 888 #else
 889 .section .l1.data.B
 890 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN */
 891 ENTRY(_trace_buff_offset)
 892         .long 0;
 893 ALIGN
 894 ENTRY(_software_trace_buff)
 895         .rept ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*256);
 896         .long 0
 897         .endr
 898 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND */
 899
 900 #if CONFIG_EARLY_PRINTK
 901 __INIT
 902 ENTRY(_early_trap)
 903         SAVE_ALL_SYS
 904         trace_buffer_stop(p0,r0);
 905
 906         /* Turn caches off, to ensure we don't get double exceptions */
 907
 908         P4.L = LO(IMEM_CONTROL);
 909         P4.H = HI(IMEM_CONTROL);
 910
 911         R5 = [P4];              /* Control Register*/
 912         BITCLR(R5,ENICPLB_P);
 913         CLI R1;
 914         SSYNC;          /* SSYNC required before writing to IMEM_CONTROL. */
 915         .align 8;
 916         [P4] = R5;
 917         SSYNC;
 918
 919         P4.L = LO(DMEM_CONTROL);
 920         P4.H = HI(DMEM_CONTROL);
 921         R5 = [P4];
 922         BITCLR(R5,ENDCPLB_P);
 923         SSYNC;          /* SSYNC required before writing to DMEM_CONTROL. */
 924         .align 8;
 925         [P4] = R5;
 926         SSYNC;
 927         STI R1;
 928
 929         r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
 930         r1 = RETX;
 931
 932         SP += -12;
 933         call _early_trap_c;
 934         SP += 12;
 935 ENDPROC(_early_trap)
 936 __FINIT
 937 #endif /* CONFIG_EARLY_PRINTK */
 938
 939 /*
 940  * Put these in the kernel data section - that should always be covered by
 941  * a CPLB. This is needed to ensure we don't get double fault conditions
 942  */
 943
 944 #ifdef CONFIG_SYSCALL_TAB_L1
 945 .section .l1.data
 946 #else
 947 .data
 948 #endif
 949
 950 ENTRY(_ex_table)
 951         /* entry for each EXCAUSE[5:0]
 952          * This table must be in sync with the table in ./kernel/traps.c
 953          * EXCPT instruction can provide 4 bits of EXCAUSE, allowing 16 to be user defined
 954          */
 955         .long _ex_syscall       /* 0x00 - User Defined - Linux Syscall */
 956         .long _ex_soft_bp       /* 0x01 - User Defined - Software breakpoint */
 957         .long _ex_replaceable   /* 0x02 - User Defined */
 958         .long _ex_trap_c        /* 0x03 - User Defined - userspace stack overflow */
 959         .long _ex_trap_c        /* 0x04 - User Defined - dump trace buffer */
 960         .long _ex_replaceable   /* 0x05 - User Defined */
 961         .long _ex_replaceable   /* 0x06 - User Defined */
 962         .long _ex_replaceable   /* 0x07 - User Defined */
 963         .long _ex_replaceable   /* 0x08 - User Defined */
 964         .long _ex_replaceable   /* 0x09 - User Defined */
 965         .long _ex_replaceable   /* 0x0A - User Defined */
 966         .long _ex_replaceable   /* 0x0B - User Defined */
 967         .long _ex_replaceable   /* 0x0C - User Defined */
 968         .long _ex_replaceable   /* 0x0D - User Defined */
 969         .long _ex_replaceable   /* 0x0E - User Defined */
 970         .long _ex_replaceable   /* 0x0F - User Defined */
 971         .long _ex_single_step   /* 0x10 - HW Single step */
 972 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 973         .long _ex_trace_buff_full /* 0x11 - Trace Buffer Full */
 974 #else
 975         .long _ex_trap_c        /* 0x11 - Trace Buffer Full */
 976 #endif
 977         .long _ex_trap_c        /* 0x12 - Reserved */
 978         .long _ex_trap_c        /* 0x13 - Reserved */
 979         .long _ex_trap_c        /* 0x14 - Reserved */
 980         .long _ex_trap_c        /* 0x15 - Reserved */
 981         .long _ex_trap_c        /* 0x16 - Reserved */
 982         .long _ex_trap_c        /* 0x17 - Reserved */
 983         .long _ex_trap_c        /* 0x18 - Reserved */
 984         .long _ex_trap_c        /* 0x19 - Reserved */
 985         .long _ex_trap_c        /* 0x1A - Reserved */
 986         .long _ex_trap_c        /* 0x1B - Reserved */
 987         .long _ex_trap_c        /* 0x1C - Reserved */
 988         .long _ex_trap_c        /* 0x1D - Reserved */
 989         .long _ex_trap_c        /* 0x1E - Reserved */
 990         .long _ex_trap_c        /* 0x1F - Reserved */
 991         .long _ex_trap_c        /* 0x20 - Reserved */
 992         .long _ex_trap_c        /* 0x21 - Undefined Instruction */
 993         .long _ex_trap_c        /* 0x22 - Illegal Instruction Combination */
 994         .long _ex_dviol         /* 0x23 - Data CPLB Protection Violation */
 995         .long _ex_trap_c        /* 0x24 - Data access misaligned */
 996         .long _ex_trap_c        /* 0x25 - Unrecoverable Event */
 997         .long _ex_dmiss         /* 0x26 - Data CPLB Miss */
 998         .long _ex_dmult         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero */
 999         .long _ex_trap_c        /* 0x28 - Emulation Watchpoint */
1000         .long _ex_trap_c        /* 0x29 - Instruction fetch access error (535 only) */
1001         .long _ex_trap_c        /* 0x2A - Instruction fetch misaligned */
1002         .long _ex_trap_c        /* 0x2B - Instruction CPLB protection Violation */
1003         .long _ex_icplb_miss    /* 0x2C - Instruction CPLB miss */
1004         .long _ex_trap_c        /* 0x2D - Instruction CPLB Multiple Hits */
1005         .long _ex_trap_c        /* 0x2E - Illegal use of Supervisor Resource */
1006         .long _ex_trap_c        /* 0x2E - Illegal use of Supervisor Resource */
1007         .long _ex_trap_c        /* 0x2F - Reserved */
1008         .long _ex_trap_c        /* 0x30 - Reserved */
1009         .long _ex_trap_c        /* 0x31 - Reserved */
1010         .long _ex_trap_c        /* 0x32 - Reserved */
1011         .long _ex_trap_c        /* 0x33 - Reserved */
1012         .long _ex_trap_c        /* 0x34 - Reserved */
1013         .long _ex_trap_c        /* 0x35 - Reserved */
1014         .long _ex_trap_c        /* 0x36 - Reserved */
1015         .long _ex_trap_c        /* 0x37 - Reserved */
1016         .long _ex_trap_c        /* 0x38 - Reserved */
1017         .long _ex_trap_c        /* 0x39 - Reserved */
1018         .long _ex_trap_c        /* 0x3A - Reserved */
1019         .long _ex_trap_c        /* 0x3B - Reserved */
1020         .long _ex_trap_c        /* 0x3C - Reserved */
1021         .long _ex_trap_c        /* 0x3D - Reserved */
1022         .long _ex_trap_c        /* 0x3E - Reserved */
1023         .long _ex_trap_c        /* 0x3F - Reserved */
1024 END(_ex_table)
1025
1026 ENTRY(_sys_call_table)
1027         .long _sys_restart_syscall      /* 0 */
1028         .long _sys_exit
1029         .long _sys_fork
1030         .long _sys_read
1031         .long _sys_write
1032         .long _sys_open         /* 5 */
1033         .long _sys_close
1034         .long _sys_ni_syscall   /* old waitpid */
1035         .long _sys_creat
1036         .long _sys_link
1037         .long _sys_unlink       /* 10 */
1038         .long _sys_execve
1039         .long _sys_chdir
1040         .long _sys_time
1041         .long _sys_mknod
1042         .long _sys_chmod                /* 15 */
1043         .long _sys_chown        /* chown16 */
1044         .long _sys_ni_syscall   /* old break syscall holder */
1045         .long _sys_ni_syscall   /* old stat */
1046         .long _sys_lseek
1047         .long _sys_getpid       /* 20 */
1048         .long _sys_mount
1049         .long _sys_ni_syscall   /* old umount */
1050         .long _sys_setuid
1051         .long _sys_getuid
1052         .long _sys_stime                /* 25 */
1053         .long _sys_ptrace
1054         .long _sys_alarm
1055         .long _sys_ni_syscall   /* old fstat */
1056         .long _sys_pause
1057         .long _sys_ni_syscall   /* old utime */ /* 30 */
1058         .long _sys_ni_syscall   /* old stty syscall holder */
1059         .long _sys_ni_syscall   /* old gtty syscall holder */
1060         .long _sys_access
1061         .long _sys_nice
1062         .long _sys_ni_syscall   /* 35 */ /* old ftime syscall holder */
1063         .long _sys_sync
1064         .long _sys_kill
1065         .long _sys_rename
1066         .long _sys_mkdir
1067         .long _sys_rmdir                /* 40 */
1068         .long _sys_dup
1069         .long _sys_pipe
1070         .long _sys_times
1071         .long _sys_ni_syscall   /* old prof syscall holder */
1072         .long _sys_brk          /* 45 */
1073         .long _sys_setgid
1074         .long _sys_getgid
1075         .long _sys_ni_syscall   /* old sys_signal */
1076         .long _sys_geteuid      /* geteuid16 */
1077         .long _sys_getegid      /* getegid16 */ /* 50 */
1078         .long _sys_acct
1079         .long _sys_umount       /* recycled never used phys() */
1080         .long _sys_ni_syscall   /* old lock syscall holder */
1081         .long _sys_ioctl
1082         .long _sys_fcntl                /* 55 */
1083         .long _sys_ni_syscall   /* old mpx syscall holder */
1084         .long _sys_setpgid
1085         .long _sys_ni_syscall   /* old ulimit syscall holder */
1086         .long _sys_ni_syscall   /* old old uname */
1087         .long _sys_umask                /* 60 */
1088         .long _sys_chroot
1089         .long _sys_ustat
1090         .long _sys_dup2
1091         .long _sys_getppid
1092         .long _sys_getpgrp      /* 65 */
1093         .long _sys_setsid
1094         .long _sys_ni_syscall   /* old sys_sigaction */
1095         .long _sys_sgetmask
1096         .long _sys_ssetmask
1097         .long _sys_setreuid     /* setreuid16 */        /* 70 */
1098         .long _sys_setregid     /* setregid16 */
1099         .long _sys_ni_syscall   /* old sys_sigsuspend */
1100         .long _sys_ni_syscall   /* old sys_sigpending */
1101         .long _sys_sethostname
1102         .long _sys_setrlimit    /* 75 */
1103         .long _sys_ni_syscall   /* old getrlimit */
1104         .long _sys_getrusage
1105         .long _sys_gettimeofday
1106         .long _sys_settimeofday
1107         .long _sys_getgroups    /* getgroups16 */       /* 80 */
1108         .long _sys_setgroups    /* setgroups16 */
1109         .long _sys_ni_syscall   /* old_select */
1110         .long _sys_symlink
1111         .long _sys_ni_syscall   /* old lstat */
1112         .long _sys_readlink     /* 85 */
1113         .long _sys_uselib
1114         .long _sys_ni_syscall   /* sys_swapon */
1115         .long _sys_reboot
1116         .long _sys_ni_syscall   /* old_readdir */
1117         .long _sys_ni_syscall   /* sys_mmap */  /* 90 */
1118         .long _sys_munmap
1119         .long _sys_truncate
1120         .long _sys_ftruncate
1121         .long _sys_fchmod
1122         .long _sys_fchown       /* fchown16 */  /* 95 */
1123         .long _sys_getpriority
1124         .long _sys_setpriority
1125         .long _sys_ni_syscall   /* old profil syscall holder */
1126         .long _sys_statfs
1127         .long _sys_fstatfs      /* 100 */
1128         .long _sys_ni_syscall
1129         .long _sys_ni_syscall   /* old sys_socketcall */
1130         .long _sys_syslog
1131         .long _sys_setitimer
1132         .long _sys_getitimer    /* 105 */
1133         .long _sys_newstat
1134         .long _sys_newlstat
1135         .long _sys_newfstat
1136         .long _sys_ni_syscall   /* old uname */
1137         .long _sys_ni_syscall   /* iopl for i386 */ /* 110 */
1138         .long _sys_vhangup
1139         .long _sys_ni_syscall   /* obsolete idle() syscall */
1140         .long _sys_ni_syscall   /* vm86old for i386 */
1141         .long _sys_wait4
1142         .long _sys_ni_syscall   /* 115 */ /* sys_swapoff */
1143         .long _sys_sysinfo
1144         .long _sys_ni_syscall   /* old sys_ipc */
1145         .long _sys_fsync
1146         .long _sys_ni_syscall   /* old sys_sigreturn */
1147         .long _sys_clone                /* 120 */
1148         .long _sys_setdomainname
1149         .long _sys_newuname
1150         .long _sys_ni_syscall   /* old sys_modify_ldt */
1151         .long _sys_adjtimex
1152         .long _sys_ni_syscall   /* 125 */ /* sys_mprotect */
1153         .long _sys_ni_syscall   /* old sys_sigprocmask */
1154         .long _sys_ni_syscall   /* old "creat_module" */
1155         .long _sys_init_module
1156         .long _sys_delete_module
1157         .long _sys_ni_syscall   /* 130: old "get_kernel_syms" */
1158         .long _sys_quotactl
1159         .long _sys_getpgid
1160         .long _sys_fchdir
1161         .long _sys_bdflush
1162         .long _sys_ni_syscall   /* 135 */ /* sys_sysfs */
1163         .long _sys_personality
1164         .long _sys_ni_syscall   /* for afs_syscall */
1165         .long _sys_setfsuid     /* setfsuid16 */
1166         .long _sys_setfsgid     /* setfsgid16 */
1167         .long _sys_llseek       /* 140 */
1168         .long _sys_getdents
1169         .long _sys_ni_syscall   /* sys_select */
1170         .long _sys_flock
1171         .long _sys_ni_syscall   /* sys_msync */
1172         .long _sys_readv                /* 145 */
1173         .long _sys_writev
1174         .long _sys_getsid
1175         .long _sys_fdatasync
1176         .long _sys_sysctl
1177         .long _sys_ni_syscall   /* 150 */ /* sys_mlock */
1178         .long _sys_ni_syscall   /* sys_munlock */
1179         .long _sys_ni_syscall   /* sys_mlockall */
1180         .long _sys_ni_syscall   /* sys_munlockall */
1181         .long _sys_sched_setparam
1182         .long _sys_sched_getparam /* 155 */
1183         .long _sys_sched_setscheduler
1184         .long _sys_sched_getscheduler
1185         .long _sys_sched_yield
1186         .long _sys_sched_get_priority_max
1187         .long _sys_sched_get_priority_min  /* 160 */
1188         .long _sys_sched_rr_get_interval
1189         .long _sys_nanosleep
1190         .long _sys_mremap
1191         .long _sys_setresuid    /* setresuid16 */
1192         .long _sys_getresuid    /* getresuid16 */       /* 165 */
1193         .long _sys_ni_syscall   /* for vm86 */
1194         .long _sys_ni_syscall   /* old "query_module" */
1195         .long _sys_ni_syscall   /* sys_poll */
1196         .long _sys_nfsservctl
1197         .long _sys_setresgid    /* setresgid16 */       /* 170 */
1198         .long _sys_getresgid    /* getresgid16 */
1199         .long _sys_prctl
1200         .long _sys_rt_sigreturn
1201         .long _sys_rt_sigaction
1202         .long _sys_rt_sigprocmask /* 175 */
1203         .long _sys_rt_sigpending
1204         .long _sys_rt_sigtimedwait
1205         .long _sys_rt_sigqueueinfo
1206         .long _sys_rt_sigsuspend
1207         .long _sys_pread64      /* 180 */
1208         .long _sys_pwrite64
1209         .long _sys_lchown       /* lchown16 */
1210         .long _sys_getcwd
1211         .long _sys_capget
1212         .long _sys_capset       /* 185 */
1213         .long _sys_sigaltstack
1214         .long _sys_sendfile
1215         .long _sys_ni_syscall   /* streams1 */
1216         .long _sys_ni_syscall   /* streams2 */
1217         .long _sys_vfork                /* 190 */
1218         .long _sys_getrlimit
1219         .long _sys_mmap2
1220         .long _sys_truncate64
1221         .long _sys_ftruncate64
1222         .long _sys_stat64       /* 195 */
1223         .long _sys_lstat64
1224         .long _sys_fstat64
1225         .long _sys_chown
1226         .long _sys_getuid
1227         .long _sys_getgid       /* 200 */
1228         .long _sys_geteuid
1229         .long _sys_getegid
1230         .long _sys_setreuid
1231         .long _sys_setregid
1232         .long _sys_getgroups    /* 205 */
1233         .long _sys_setgroups
1234         .long _sys_fchown
1235         .long _sys_setresuid
1236         .long _sys_getresuid
1237         .long _sys_setresgid    /* 210 */
1238         .long _sys_getresgid
1239         .long _sys_lchown
1240         .long _sys_setuid
1241         .long _sys_setgid
1242         .long _sys_setfsuid     /* 215 */
1243         .long _sys_setfsgid
1244         .long _sys_pivot_root
1245         .long _sys_ni_syscall   /* sys_mincore */
1246         .long _sys_ni_syscall   /* sys_madvise */
1247         .long _sys_getdents64   /* 220 */
1248         .long _sys_fcntl64
1249         .long _sys_ni_syscall   /* reserved for TUX */
1250         .long _sys_ni_syscall
1251         .long _sys_gettid
1252         .long _sys_readahead    /* 225 */
1253         .long _sys_setxattr
1254         .long _sys_lsetxattr
1255         .long _sys_fsetxattr
1256         .long _sys_getxattr
1257         .long _sys_lgetxattr    /* 230 */
1258         .long _sys_fgetxattr
1259         .long _sys_listxattr
1260         .long _sys_llistxattr
1261         .long _sys_flistxattr
1262         .long _sys_removexattr  /* 235 */
1263         .long _sys_lremovexattr
1264         .long _sys_fremovexattr
1265         .long _sys_tkill
1266         .long _sys_sendfile64
1267         .long _sys_futex                /* 240 */
1268         .long _sys_sched_setaffinity
1269         .long _sys_sched_getaffinity
1270         .long _sys_ni_syscall   /* sys_set_thread_area */
1271         .long _sys_ni_syscall   /* sys_get_thread_area */
1272         .long _sys_io_setup     /* 245 */
1273         .long _sys_io_destroy
1274         .long _sys_io_getevents
1275         .long _sys_io_submit
1276         .long _sys_io_cancel
1277         .long _sys_ni_syscall   /* 250 */ /* sys_alloc_hugepages */
1278         .long _sys_ni_syscall   /* sys_freec_hugepages */
1279         .long _sys_exit_group
1280         .long _sys_lookup_dcookie
1281         .long _sys_bfin_spinlock
1282         .long _sys_epoll_create /* 255 */
1283         .long _sys_epoll_ctl
1284         .long _sys_epoll_wait
1285         .long _sys_ni_syscall /* remap_file_pages */
1286         .long _sys_set_tid_address
1287         .long _sys_timer_create /* 260 */
1288         .long _sys_timer_settime
1289         .long _sys_timer_gettime
1290         .long _sys_timer_getoverrun
1291         .long _sys_timer_delete
1292         .long _sys_clock_settime /* 265 */
1293         .long _sys_clock_gettime
1294         .long _sys_clock_getres
1295         .long _sys_clock_nanosleep
1296         .long _sys_statfs64
1297         .long _sys_fstatfs64    /* 270 */
1298         .long _sys_tgkill
1299         .long _sys_utimes
1300         .long _sys_fadvise64_64
1301         .long _sys_ni_syscall /* vserver */
1302         .long _sys_ni_syscall /* 275, mbind */
1303         .long _sys_ni_syscall /* get_mempolicy */
1304         .long _sys_ni_syscall /* set_mempolicy */
1305         .long _sys_mq_open
1306         .long _sys_mq_unlink
1307         .long _sys_mq_timedsend /* 280 */
1308         .long _sys_mq_timedreceive
1309         .long _sys_mq_notify
1310         .long _sys_mq_getsetattr
1311         .long _sys_ni_syscall /* kexec_load */
1312         .long _sys_waitid       /* 285 */
1313         .long _sys_add_key
1314         .long _sys_request_key
1315         .long _sys_keyctl
1316         .long _sys_ioprio_set
1317         .long _sys_ioprio_get   /* 290 */
1318         .long _sys_inotify_init
1319         .long _sys_inotify_add_watch
1320         .long _sys_inotify_rm_watch
1321         .long _sys_ni_syscall /* migrate_pages */
1322         .long _sys_openat       /* 295 */
1323         .long _sys_mkdirat
1324         .long _sys_mknodat
1325         .long _sys_fchownat
1326         .long _sys_futimesat
1327         .long _sys_fstatat64    /* 300 */
1328         .long _sys_unlinkat
1329         .long _sys_renameat
1330         .long _sys_linkat
1331         .long _sys_symlinkat
1332         .long _sys_readlinkat   /* 305 */
1333         .long _sys_fchmodat
1334         .long _sys_faccessat
1335         .long _sys_pselect6
1336         .long _sys_ppoll
1337         .long _sys_unshare      /* 310 */
1338         .long _sys_sram_alloc
1339         .long _sys_sram_free
1340         .long _sys_dma_memcpy
1341         .long _sys_accept
1342         .long _sys_bind         /* 315 */
1343         .long _sys_connect
1344         .long _sys_getpeername
1345         .long _sys_getsockname
1346         .long _sys_getsockopt
1347         .long _sys_listen       /* 320 */
1348         .long _sys_recv
1349         .long _sys_recvfrom
1350         .long _sys_recvmsg
1351         .long _sys_send
1352         .long _sys_sendmsg      /* 325 */
1353         .long _sys_sendto
1354         .long _sys_setsockopt
1355         .long _sys_shutdown
1356         .long _sys_socket
1357         .long _sys_socketpair   /* 330 */
1358         .long _sys_semctl
1359         .long _sys_semget
1360         .long _sys_semop
1361         .long _sys_msgctl
1362         .long _sys_msgget       /* 335 */
1363         .long _sys_msgrcv
1364         .long _sys_msgsnd
1365         .long _sys_shmat
1366         .long _sys_shmctl
1367         .long _sys_shmdt        /* 340 */
1368         .long _sys_shmget
1369         .long _sys_splice
1370         .long _sys_sync_file_range
1371         .long _sys_tee
1372         .long _sys_vmsplice     /* 345 */
1373         .long _sys_epoll_pwait
1374         .long _sys_utimensat
1375         .long _sys_signalfd
1376         .long _sys_ni_syscall
1377         .long _sys_eventfd      /* 350 */
1378         .long _sys_pread64
1379         .long _sys_pwrite64
1380         .long _sys_fadvise64
1381         .long _sys_set_robust_list
1382         .long _sys_get_robust_list      /* 355 */
1383         .long _sys_fallocate
1384         .long _sys_semtimedop
1385         .rept NR_syscalls-(.-_sys_call_table)/4
1386         .long _sys_ni_syscall
1387         .endr
1388 _excpt_saved_imask:
1389         .long 0;
1390
1391 _exception_stack:
1392         .rept 1024
1393         .long 0;
1394         .endr
1395 _exception_stack_top:
1396
1397 #if ANOMALY_05000261
1398 /* Used by the assembly entry point to work around an anomaly.  */
1399 _last_cplb_fault_retx:
1400         .long 0;
1401 #endif
1402 /*
1403  * Single instructions can have multiple faults, which need to be
1404  * handled by traps.c, in irq5. We store the exception cause to ensure
1405  * we don't miss a double fault condition
1406  */
1407 ENTRY(_in_ptr_excause)
1408         .long 0;
1409 ENTRY(_out_ptr_excause)
1410         .long 0;
1411 ALIGN
1412 ENTRY(_excause_circ_buf)
1413         .rept 4
1414         .long 0
1415         .endr