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