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 <linux/threads.h>
  40 #include <asm/blackfin.h>
  41 #include <asm/errno.h>
  42 #include <asm/fixed_code.h>
  43 #include <asm/thread_info.h>  /* TIF_NEED_RESCHED */
  44 #include <asm/asm-offsets.h>
  45 #include <asm/trace.h>
  46
  47 #include <asm/context.S>
  48
  49 #if defined(CONFIG_BFIN_SCRATCH_REG_RETN)
  50 # define EX_SCRATCH_REG RETN
  51 #elif defined(CONFIG_BFIN_SCRATCH_REG_RETE)
  52 # define EX_SCRATCH_REG RETE
  53 #else
  54 # define EX_SCRATCH_REG CYCLES
  55 #endif
  56
  57 #ifdef CONFIG_EXCPT_IRQ_SYSC_L1
  58 .section .l1.text
  59 #else
  60 .text
  61 #endif
  62
  63 /* Slightly simplified and streamlined entry point for CPLB misses.
  64  * This one does not lower the level to IRQ5, and thus can be used to
  65  * patch up CPLB misses on the kernel stack.
  66  */
  67 #if ANOMALY_05000261
  68 #define _ex_dviol _ex_workaround_261
  69 #define _ex_dmiss _ex_workaround_261
  70 #define _ex_dmult _ex_workaround_261
  71
  72 ENTRY(_ex_workaround_261)
  73         /*
  74          * Work around an anomaly: if we see a new DCPLB fault, return
  75          * without doing anything.  Then, if we get the same fault again,
  76          * handle it.
  77          */
  78         P4 = R7;        /* Store EXCAUSE */
  79
  80         GET_PDA(p5, r7);
  81         r7 = [p5 + PDA_LFRETX];
  82         r6 = retx;
  83         [p5 + PDA_LFRETX] = r6;
  84         cc = r6 == r7;
  85         if !cc jump _bfin_return_from_exception;
  86         /* fall through */
  87         R7 = P4;
  88         R6 = 0x26;      /* Data CPLB Miss */
  89         cc = R6 == R7;
  90         if cc jump _ex_dcplb_miss (BP);
  91         R6 = 0x23;      /* Data CPLB Miss */
  92         cc = R6 == R7;
  93         if cc jump _ex_dcplb_viol (BP);
  94         /* Handle 0x23 Data CPLB Protection Violation
  95          * and Data CPLB Multiple Hits - Linux Trap Zero
  96          */
  97         jump _ex_trap_c;
  98 ENDPROC(_ex_workaround_261)
  99
 100 #else
 101 #ifdef CONFIG_MPU
 102 #define _ex_dviol _ex_dcplb_viol
 103 #else
 104 #define _ex_dviol _ex_trap_c
 105 #endif
 106 #define _ex_dmiss _ex_dcplb_miss
 107 #define _ex_dmult _ex_trap_c
 108 #endif
 109
 110
 111 ENTRY(_ex_dcplb_viol)
 112 ENTRY(_ex_dcplb_miss)
 113 ENTRY(_ex_icplb_miss)
 114         (R7:6,P5:4) = [sp++];
 115         /* We leave the previously pushed ASTAT on the stack.  */
 116         SAVE_CONTEXT_CPLB
 117
 118         /* We must load R1 here, _before_ DEBUG_HWTRACE_SAVE, since that
 119          * will change the stack pointer.  */
 120         R0 = SEQSTAT;
 121         R1 = SP;
 122
 123         DEBUG_HWTRACE_SAVE(p5, r7)
 124
 125         sp += -12;
 126         call _cplb_hdr;
 127         sp += 12;
 128         CC = R0 == 0;
 129         IF !CC JUMP _handle_bad_cplb;
 130
 131 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 132         /* While we were processing this, did we double fault? */
 133         r7 = SEQSTAT;           /* reason code is in bit 5:0 */
 134         r6.l = lo(SEQSTAT_EXCAUSE);
 135         r6.h = hi(SEQSTAT_EXCAUSE);
 136         r7 = r7 & r6;
 137         r6 = 0x25;
 138         CC = R7 == R6;
 139         if CC JUMP _double_fault;
 140 #endif
 141
 142         DEBUG_HWTRACE_RESTORE(p5, r7)
 143         RESTORE_CONTEXT_CPLB
 144         ASTAT = [SP++];
 145         SP = EX_SCRATCH_REG;
 146         rtx;
 147 ENDPROC(_ex_icplb_miss)
 148
 149 ENTRY(_ex_syscall)
 150         raise 15;               /* invoked by TRAP #0, for sys call */
 151         jump.s _bfin_return_from_exception;
 152 ENDPROC(_ex_syscall)
 153
 154 ENTRY(_ex_single_step)
 155         /* If we just returned from an interrupt, the single step event is
 156            for the RTI instruction.  */
 157         r7 = retx;
 158         r6 = reti;
 159         cc = r7 == r6;
 160         if cc jump _bfin_return_from_exception;
 161
 162 #ifdef CONFIG_KGDB
 163         /* Don't do single step in hardware exception handler */
 164         p5.l = lo(IPEND);
 165         p5.h = hi(IPEND);
 166         r6 = [p5];
 167         cc = bittst(r6, 4);
 168         if cc jump _bfin_return_from_exception;
 169         cc = bittst(r6, 5);
 170         if cc jump _bfin_return_from_exception;
 171
 172         /* skip single step if current interrupt priority is higher than
 173          * that of the first instruction, from which gdb starts single step */
 174         r6 >>= 6;
 175         r7 = 10;
 176 .Lfind_priority_start:
 177         cc = bittst(r6, 0);
 178         if cc jump .Lfind_priority_done;
 179         r6 >>= 1;
 180         r7 += -1;
 181         cc = r7 == 0;
 182         if cc jump .Lfind_priority_done;
 183         jump.s .Lfind_priority_start;
 184 .Lfind_priority_done:
 185         p4.l = _kgdb_single_step;
 186         p4.h = _kgdb_single_step;
 187         r6 = [p4];
 188         cc = r6 == 0;
 189         if cc jump .Ldo_single_step;
 190         r6 += -1;
 191         cc = r6 < r7;
 192         if cc jump 1f;
 193 .Ldo_single_step:
 194 #else
 195         /* If we were in user mode, do the single step normally.  */
 196         p5.l = lo(IPEND);
 197         p5.h = hi(IPEND);
 198         r6 = [p5];
 199         r7 = 0xffe0 (z);
 200         r7 = r7 & r6;
 201         cc = r7 == 0;
 202         if !cc jump 1f;
 203 #endif
 204
 205         /* Single stepping only a single instruction, so clear the trace
 206          * bit here.  */
 207         r7 = syscfg;
 208         bitclr (r7, 0);
 209         syscfg = R7;
 210         jump _ex_trap_c;
 211
 212 1:
 213         /*
 214          * We were in an interrupt handler.  By convention, all of them save
 215          * SYSCFG with their first instruction, so by checking whether our
 216          * RETX points at the entry point, we can determine whether to allow
 217          * a single step, or whether to clear SYSCFG.
 218          *
 219          * First, find out the interrupt level and the event vector for it.
 220          */
 221         p5.l = lo(EVT0);
 222         p5.h = hi(EVT0);
 223         p5 += -4;
 224 2:
 225         r7 = rot r7 by -1;
 226         p5 += 4;
 227         if !cc jump 2b;
 228
 229         /* What we actually do is test for the _second_ instruction in the
 230          * IRQ handler.  That way, if there are insns following the restore
 231          * of SYSCFG after leaving the handler, we will not turn off SYSCFG
 232          * for them.  */
 233
 234         r7 = [p5];
 235         r7 += 2;
 236         r6 = RETX;
 237         cc = R7 == R6;
 238         if !cc jump _bfin_return_from_exception;
 239
 240         r7 = syscfg;
 241         bitclr (r7, 0);
 242         syscfg = R7;
 243
 244         /* Fall through to _bfin_return_from_exception.  */
 245 ENDPROC(_ex_single_step)
 246
 247 ENTRY(_bfin_return_from_exception)
 248 #if ANOMALY_05000257
 249         R7=LC0;
 250         LC0=R7;
 251         R7=LC1;
 252         LC1=R7;
 253 #endif
 254
 255 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 256         /* While we were processing the current exception,
 257          * did we cause another, and double fault?
 258          */
 259         r7 = SEQSTAT;           /* reason code is in bit 5:0 */
 260         r6.l = lo(SEQSTAT_EXCAUSE);
 261         r6.h = hi(SEQSTAT_EXCAUSE);
 262         r7 = r7 & r6;
 263         r6 = 0x25;
 264         CC = R7 == R6;
 265         if CC JUMP _double_fault;
 266
 267         /* Did we cause a HW error? */
 268         p5.l = lo(ILAT);
 269         p5.h = hi(ILAT);
 270         r6 = [p5];
 271         r7 = 0x20;              /* Did I just cause anther HW error? */
 272         r6 = r7 & r6;
 273         CC = R7 == R6;
 274         if CC JUMP _double_fault;
 275 #endif
 276
 277         (R7:6,P5:4) = [sp++];
 278         ASTAT = [sp++];
 279         sp = EX_SCRATCH_REG;
 280         rtx;
 281 ENDPROC(_bfin_return_from_exception)
 282
 283 ENTRY(_handle_bad_cplb)
 284         DEBUG_HWTRACE_RESTORE(p5, r7)
 285         /* To get here, we just tried and failed to change a CPLB
 286          * so, handle things in trap_c (C code), by lowering to
 287          * IRQ5, just like we normally do. Since this is not a
 288          * "normal" return path, we have a do alot of stuff to
 289          * the stack to get ready so, we can fall through - we
 290          * need to make a CPLB exception look like a normal exception
 291          */
 292         RESTORE_CONTEXT_CPLB
 293         /* ASTAT is still on the stack, where it is needed.  */
 294         [--sp] = (R7:6,P5:4);
 295
 296 ENTRY(_ex_replaceable)
 297         nop;
 298
 299 ENTRY(_ex_trap_c)
 300         /* Make sure we are not in a double fault */
 301         p4.l = lo(IPEND);
 302         p4.h = hi(IPEND);
 303         r7 = [p4];
 304         CC = BITTST (r7, 5);
 305         if CC jump _double_fault;
 306
 307         /* Call C code (trap_c) to handle the exception, which most
 308          * likely involves sending a signal to the current process.
 309          * To avoid double faults, lower our priority to IRQ5 first.
 310          */
 311         P5.h = _exception_to_level5;
 312         P5.l = _exception_to_level5;
 313         p4.l = lo(EVT5);
 314         p4.h = hi(EVT5);
 315         [p4] = p5;
 316         csync;
 317
 318         GET_PDA(p5, r6);
 319 #ifndef CONFIG_DEBUG_DOUBLEFAULT
 320
 321         /*
 322          * Save these registers, as they are only valid in exception context
 323          *  (where we are now - as soon as we defer to IRQ5, they can change)
 324          * DCPLB_STATUS and ICPLB_STATUS are also only valid in EVT3,
 325          * but they are not very interesting, so don't save them
 326          */
 327
 328         p4.l = lo(DCPLB_FAULT_ADDR);
 329         p4.h = hi(DCPLB_FAULT_ADDR);
 330         r7 = [p4];
 331         [p5 + PDA_DCPLB] = r7;
 332
 333         p4.l = lo(ICPLB_FAULT_ADDR);
 334         p4.h = hi(ICPLB_FAULT_ADDR);
 335         r6 = [p4];
 336         [p5 + PDA_ICPLB] = r6;
 337
 338         r6 = retx;
 339         [p5 + PDA_RETX] = r6;
 340 #endif
 341         r6 = SYSCFG;
 342         [p5 + PDA_SYSCFG] = r6;
 343         BITCLR(r6, 0);
 344         SYSCFG = r6;
 345
 346         /* Disable all interrupts, but make sure level 5 is enabled so
 347          * we can switch to that level.  Save the old mask.  */
 348         cli r6;
 349         [p5 + PDA_EXIMASK] = r6;
 350
 351         p4.l = lo(SAFE_USER_INSTRUCTION);
 352         p4.h = hi(SAFE_USER_INSTRUCTION);
 353         retx = p4;
 354
 355         r6 = 0x3f;
 356         sti r6;
 357
 358         raise 5;
 359         jump.s _bfin_return_from_exception;
 360 ENDPROC(_ex_trap_c)
 361
 362 /* We just realized we got an exception, while we were processing a different
 363  * exception. This is a unrecoverable event, so crash.
 364  * Note: this cannot be ENTRY() as we jump here with "if cc jump" ...
 365  */
 366 _double_fault:
 367         /* Turn caches & protection off, to ensure we don't get any more
 368          * double exceptions
 369          */
 370
 371         P4.L = LO(IMEM_CONTROL);
 372         P4.H = HI(IMEM_CONTROL);
 373
 374         R5 = [P4];              /* Control Register*/
 375         BITCLR(R5,ENICPLB_P);
 376         SSYNC;          /* SSYNC required before writing to IMEM_CONTROL. */
 377         .align 8;
 378         [P4] = R5;
 379         SSYNC;
 380
 381         P4.L = LO(DMEM_CONTROL);
 382         P4.H = HI(DMEM_CONTROL);
 383         R5 = [P4];
 384         BITCLR(R5,ENDCPLB_P);
 385         SSYNC;          /* SSYNC required before writing to DMEM_CONTROL. */
 386         .align 8;
 387         [P4] = R5;
 388         SSYNC;
 389
 390         /* Fix up the stack */
 391         (R7:6,P5:4) = [sp++];
 392         ASTAT = [sp++];
 393         SP = EX_SCRATCH_REG;
 394
 395         /* We should be out of the exception stack, and back down into
 396          * kernel or user space stack
 397          */
 398         SAVE_ALL_SYS
 399
 400         /* The dumping functions expect the return address in the RETI
 401          * slot.  */
 402         r6 = retx;
 403         [sp + PT_PC] = r6;
 404
 405         r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
 406         SP += -12;
 407         call _double_fault_c;
 408         SP += 12;
 409 .L_double_fault_panic:
 410         JUMP .L_double_fault_panic
 411
 412 ENDPROC(_double_fault)
 413
 414 ENTRY(_exception_to_level5)
 415         SAVE_ALL_SYS
 416
 417         GET_PDA(p4, r7);        /* Fetch current PDA */
 418         r6 = [p4 + PDA_RETX];
 419         [sp + PT_PC] = r6;
 420
 421         r6 = [p4 + PDA_SYSCFG];
 422         [sp + PT_SYSCFG] = r6;
 423
 424         /* Restore interrupt mask.  We haven't pushed RETI, so this
 425          * doesn't enable interrupts until we return from this handler.  */
 426         r6 = [p4 + PDA_EXIMASK];
 427         sti r6;
 428
 429         /* Restore the hardware error vector.  */
 430         P5.h = _evt_ivhw;
 431         P5.l = _evt_ivhw;
 432         p4.l = lo(EVT5);
 433         p4.h = hi(EVT5);
 434         [p4] = p5;
 435         csync;
 436
 437         p2.l = lo(IPEND);
 438         p2.h = hi(IPEND);
 439         csync;
 440         r0 = [p2];              /* Read current IPEND */
 441         [sp + PT_IPEND] = r0;   /* Store IPEND */
 442
 443         r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
 444         SP += -12;
 445         call _trap_c;
 446         SP += 12;
 447
 448 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 449         /* Grab ILAT */
 450         p2.l = lo(ILAT);
 451         p2.h = hi(ILAT);
 452         r0 = [p2];
 453         r1 = 0x20;  /* Did I just cause anther HW error? */
 454         r0 = r0 & r1;
 455         CC = R0 == R1;
 456         if CC JUMP _double_fault;
 457 #endif
 458
 459         call _ret_from_exception;
 460         RESTORE_ALL_SYS
 461         rti;
 462 ENDPROC(_exception_to_level5)
 463
 464 ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
 465         /* Since the kernel stack can be anywhere, it's not guaranteed to be
 466          * covered by a CPLB.  Switch to an exception stack; use RETN as a
 467          * scratch register (for want of a better option).
 468          */
 469         EX_SCRATCH_REG = sp;
 470         GET_PDA_SAFE(sp);
 471         sp = [sp + PDA_EXSTACK]
 472         /* Try to deal with syscalls quickly.  */
 473         [--sp] = ASTAT;
 474         [--sp] = (R7:6,P5:4);
 475
 476 #if ANOMALY_05000283 || ANOMALY_05000315
 477         cc = r7 == r7;
 478         p5.h = HI(CHIPID);
 479         p5.l = LO(CHIPID);
 480         if cc jump 1f;
 481         r7.l = W[p5];
 482 1:
 483 #endif
 484
 485 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 486         /*
 487          * Save these registers, as they are only valid in exception context
 488          * (where we are now - as soon as we defer to IRQ5, they can change)
 489          * DCPLB_STATUS and ICPLB_STATUS are also only valid in EVT3,
 490          * but they are not very interesting, so don't save them
 491          */
 492
 493         GET_PDA(p5, r7);
 494         p4.l = lo(DCPLB_FAULT_ADDR);
 495         p4.h = hi(DCPLB_FAULT_ADDR);
 496         r7 = [p4];
 497         [p5 + PDA_DCPLB] = r7;
 498
 499         p4.l = lo(ICPLB_FAULT_ADDR);
 500         p4.h = hi(ICPLB_FAULT_ADDR);
 501         r7 = [p4];
 502         [p5 + PDA_ICPLB] = r7;
 503
 504         r6 = retx;
 505         [p5 + PDA_RETX] = r6;
 506
 507         r7 = SEQSTAT;           /* reason code is in bit 5:0 */
 508         [p5 + PDA_SEQSTAT] = r7;
 509 #else
 510         r7 = SEQSTAT;           /* reason code is in bit 5:0 */
 511 #endif
 512         r6.l = lo(SEQSTAT_EXCAUSE);
 513         r6.h = hi(SEQSTAT_EXCAUSE);
 514         r7 = r7 & r6;
 515         p5.h = _ex_table;
 516         p5.l = _ex_table;
 517         p4 = r7;
 518         p5 = p5 + (p4 << 2);
 519         p4 = [p5];
 520         jump (p4);
 521
 522 .Lbadsys:
 523         r7 = -ENOSYS;           /* signextending enough */
 524         [sp + PT_R0] = r7;      /* return value from system call */
 525         jump .Lsyscall_really_exit;
 526 ENDPROC(_trap)
 527
 528 ENTRY(_kernel_execve)
 529         link SIZEOF_PTREGS;
 530         p0 = sp;
 531         r3 = SIZEOF_PTREGS / 4;
 532         r4 = 0(x);
 533 .Lclear_regs:
 534         [p0++] = r4;
 535         r3 += -1;
 536         cc = r3 == 0;
 537         if !cc jump .Lclear_regs (bp);
 538
 539         p0 = sp;
 540         sp += -16;
 541         [sp + 12] = p0;
 542         call _do_execve;
 543         SP += 16;
 544         cc = r0 == 0;
 545         if ! cc jump .Lexecve_failed;
 546         /* Success.  Copy our temporary pt_regs to the top of the kernel
 547          * stack and do a normal exception return.
 548          */
 549         r1 = sp;
 550         r0 = (-KERNEL_STACK_SIZE) (x);
 551         r1 = r1 & r0;
 552         p2 = r1;
 553         p3 = [p2];
 554         r0 = KERNEL_STACK_SIZE - 4 (z);
 555         p1 = r0;
 556         p1 = p1 + p2;
 557
 558         p0 = fp;
 559         r4 = [p0--];
 560         r3 = SIZEOF_PTREGS / 4;
 561 .Lcopy_regs:
 562         r4 = [p0--];
 563         [p1--] = r4;
 564         r3 += -1;
 565         cc = r3 == 0;
 566         if ! cc jump .Lcopy_regs (bp);
 567
 568         r0 = (KERNEL_STACK_SIZE - SIZEOF_PTREGS) (z);
 569         p1 = r0;
 570         p1 = p1 + p2;
 571         sp = p1;
 572         r0 = syscfg;
 573         [SP + PT_SYSCFG] = r0;
 574         [p3 + (TASK_THREAD + THREAD_KSP)] = sp;
 575
 576         RESTORE_CONTEXT;
 577         rti;
 578 .Lexecve_failed:
 579         unlink;
 580         rts;
 581 ENDPROC(_kernel_execve)
 582
 583 ENTRY(_system_call)
 584         /* Store IPEND */
 585         p2.l = lo(IPEND);
 586         p2.h = hi(IPEND);
 587         csync;
 588         r0 = [p2];
 589         [sp + PT_IPEND] = r0;
 590
 591         /* Store RETS for now */
 592         r0 = rets;
 593         [sp + PT_RESERVED] = r0;
 594         /* Set the stack for the current process */
 595         r7 = sp;
 596         r6.l = lo(ALIGN_PAGE_MASK);
 597         r6.h = hi(ALIGN_PAGE_MASK);
 598         r7 = r7 & r6;           /* thread_info */
 599         p2 = r7;
 600         p2 = [p2];
 601
 602         [p2+(TASK_THREAD+THREAD_KSP)] = sp;
 603 #ifdef CONFIG_IPIPE
 604         r0 = sp;
 605         SP += -12;
 606         call ___ipipe_syscall_root;
 607         SP += 12;
 608         cc = r0 == 1;
 609         if cc jump .Lsyscall_really_exit;
 610         cc = r0 == -1;
 611         if cc jump .Lresume_userspace;
 612         r3 = [sp + PT_R3];
 613         r4 = [sp + PT_R4];
 614         p0 = [sp + PT_ORIG_P0];
 615 #endif /* CONFIG_IPIPE */
 616
 617         /* Check the System Call */
 618         r7 = __NR_syscall;
 619         /* System call number is passed in P0 */
 620         r6 = p0;
 621         cc = r6 < r7;
 622         if ! cc jump .Lbadsys;
 623
 624         /* are we tracing syscalls?*/
 625         r7 = sp;
 626         r6.l = lo(ALIGN_PAGE_MASK);
 627         r6.h = hi(ALIGN_PAGE_MASK);
 628         r7 = r7 & r6;
 629         p2 = r7;
 630         r7 = [p2+TI_FLAGS];
 631         CC = BITTST(r7,TIF_SYSCALL_TRACE);
 632         if CC JUMP _sys_trace;
 633
 634         /* Execute the appropriate system call */
 635
 636         p4 = p0;
 637         p5.l = _sys_call_table;
 638         p5.h = _sys_call_table;
 639         p5 = p5 + (p4 << 2);
 640         r0 = [sp + PT_R0];
 641         r1 = [sp + PT_R1];
 642         r2 = [sp + PT_R2];
 643         p5 = [p5];
 644
 645         [--sp] = r5;
 646         [--sp] = r4;
 647         [--sp] = r3;
 648         SP += -12;
 649         call (p5);
 650         SP += 24;
 651         [sp + PT_R0] = r0;
 652
 653 .Lresume_userspace:
 654         r7 = sp;
 655         r4.l = lo(ALIGN_PAGE_MASK);
 656         r4.h = hi(ALIGN_PAGE_MASK);
 657         r7 = r7 & r4;           /* thread_info->flags */
 658         p5 = r7;
 659 .Lresume_userspace_1:
 660         /* Disable interrupts.  */
 661         [--sp] = reti;
 662         reti = [sp++];
 663
 664         r7 = [p5 + TI_FLAGS];
 665         r4.l = lo(_TIF_WORK_MASK);
 666         r4.h = hi(_TIF_WORK_MASK);
 667         r7 =  r7 & r4;
 668
 669 .Lsyscall_resched:
 670 #ifdef CONFIG_IPIPE
 671         cc = BITTST(r7, TIF_IRQ_SYNC);
 672         if !cc jump .Lsyscall_no_irqsync;
 673         [--sp] = reti;
 674         r0 = [sp++];
 675         SP += -12;
 676         call ___ipipe_sync_root;
 677         SP += 12;
 678         jump .Lresume_userspace_1;
 679 .Lsyscall_no_irqsync:
 680 #endif
 681         cc = BITTST(r7, TIF_NEED_RESCHED);
 682         if !cc jump .Lsyscall_sigpending;
 683
 684         /* Reenable interrupts.  */
 685         [--sp] = reti;
 686         r0 = [sp++];
 687
 688         SP += -12;
 689         call _schedule;
 690         SP += 12;
 691
 692         jump .Lresume_userspace_1;
 693
 694 .Lsyscall_sigpending:
 695         cc = BITTST(r7, TIF_RESTORE_SIGMASK);
 696         if cc jump .Lsyscall_do_signals;
 697         cc = BITTST(r7, TIF_SIGPENDING);
 698         if !cc jump .Lsyscall_really_exit;
 699 .Lsyscall_do_signals:
 700         /* Reenable interrupts.  */
 701         [--sp] = reti;
 702         r0 = [sp++];
 703
 704         r0 = sp;
 705         SP += -12;
 706         call _do_signal;
 707         SP += 12;
 708
 709 .Lsyscall_really_exit:
 710         r5 = [sp + PT_RESERVED];
 711         rets = r5;
 712 #ifdef CONFIG_IPIPE
 713         [--sp] = reti;
 714         r5 = [sp++];
 715 #endif /* CONFIG_IPIPE */
 716         rts;
 717 ENDPROC(_system_call)
 718
 719 /* Do not mark as ENTRY() to avoid error in assembler ...
 720  * this symbol need not be global anyways, so ...
 721  */
 722 _sys_trace:
 723         call _syscall_trace;
 724
 725         /* Execute the appropriate system call */
 726
 727         p4 = [SP + PT_P0];
 728         p5.l = _sys_call_table;
 729         p5.h = _sys_call_table;
 730         p5 = p5 + (p4 << 2);
 731         r0 = [sp + PT_R0];
 732         r1 = [sp + PT_R1];
 733         r2 = [sp + PT_R2];
 734         r3 = [sp + PT_R3];
 735         r4 = [sp + PT_R4];
 736         r5 = [sp + PT_R5];
 737         p5 = [p5];
 738
 739         [--sp] = r5;
 740         [--sp] = r4;
 741         [--sp] = r3;
 742         SP += -12;
 743         call (p5);
 744         SP += 24;
 745         [sp + PT_R0] = r0;
 746
 747         call _syscall_trace;
 748         jump .Lresume_userspace;
 749 ENDPROC(_sys_trace)
 750
 751 ENTRY(_resume)
 752         /*
 753          * Beware - when entering resume, prev (the current task) is
 754          * in r0, next (the new task) is in r1.
 755          */
 756         p0 = r0;
 757         p1 = r1;
 758         [--sp] = rets;
 759         [--sp] = fp;
 760         [--sp] = (r7:4, p5:3);
 761
 762         /* save usp */
 763         p2 = usp;
 764         [p0+(TASK_THREAD+THREAD_USP)] = p2;
 765
 766         /* save current kernel stack pointer */
 767         [p0+(TASK_THREAD+THREAD_KSP)] = sp;
 768
 769         /* save program counter */
 770         r1.l = _new_old_task;
 771         r1.h = _new_old_task;
 772         [p0+(TASK_THREAD+THREAD_PC)] = r1;
 773
 774         /* restore the kernel stack pointer */
 775         sp = [p1+(TASK_THREAD+THREAD_KSP)];
 776
 777         /* restore user stack pointer */
 778         p0 = [p1+(TASK_THREAD+THREAD_USP)];
 779         usp = p0;
 780
 781         /* restore pc */
 782         p0 = [p1+(TASK_THREAD+THREAD_PC)];
 783         jump (p0);
 784
 785         /*
 786          * Following code actually lands up in a new (old) task.
 787          */
 788
 789 _new_old_task:
 790         (r7:4, p5:3) = [sp++];
 791         fp = [sp++];
 792         rets = [sp++];
 793
 794         /*
 795          * When we come out of resume, r0 carries "old" task, becuase we are
 796          * in "new" task.
 797          */
 798         rts;
 799 ENDPROC(_resume)
 800
 801 ENTRY(_ret_from_exception)
 802 #ifdef CONFIG_IPIPE
 803         [--sp] = rets;
 804         SP += -12;
 805         call ___ipipe_check_root
 806         SP += 12
 807         rets = [sp++];
 808         cc = r0 == 0;
 809         if cc jump 4f;                /* not on behalf of Linux, get out */
 810 #endif /* CONFIG_IPIPE */
 811         p2.l = lo(IPEND);
 812         p2.h = hi(IPEND);
 813
 814         csync;
 815         r0 = [p2];
 816         [sp + PT_IPEND] = r0;
 817
 818 1:
 819         r2 = LO(~0x37) (Z);
 820         r0 = r2 & r0;
 821         cc = r0 == 0;
 822         if !cc jump 4f; /* if not return to user mode, get out */
 823
 824         /* Make sure any pending system call or deferred exception
 825          * return in ILAT for this process to get executed, otherwise
 826          * in case context switch happens, system call of
 827          * first process (i.e in ILAT) will be carried
 828          * forward to the switched process
 829          */
 830
 831         p2.l = lo(ILAT);
 832         p2.h = hi(ILAT);
 833         r0 = [p2];
 834         r1 = (EVT_IVG14 | EVT_IVG15) (z);
 835         r0 = r0 & r1;
 836         cc = r0 == 0;
 837         if !cc jump 5f;
 838
 839         /* Set the stack for the current process */
 840         r7 = sp;
 841         r4.l = lo(ALIGN_PAGE_MASK);
 842         r4.h = hi(ALIGN_PAGE_MASK);
 843         r7 = r7 & r4;           /* thread_info->flags */
 844         p5 = r7;
 845         r7 = [p5 + TI_FLAGS];
 846         r4.l = lo(_TIF_WORK_MASK);
 847         r4.h = hi(_TIF_WORK_MASK);
 848         r7 =  r7 & r4;
 849         cc = r7 == 0;
 850         if cc jump 4f;
 851
 852         p0.l = lo(EVT15);
 853         p0.h = hi(EVT15);
 854         p1.l = _schedule_and_signal;
 855         p1.h = _schedule_and_signal;
 856         [p0] = p1;
 857         csync;
 858         raise 15;               /* raise evt14 to do signal or reschedule */
 859 4:
 860         r0 = syscfg;
 861         bitclr(r0, 0);
 862         syscfg = r0;
 863 5:
 864         rts;
 865 ENDPROC(_ret_from_exception)
 866
 867 #ifdef CONFIG_IPIPE
 868
 869 _sync_root_irqs:
 870         [--sp] = reti;          /* Reenable interrupts */
 871         r0 = [sp++];
 872         jump.l ___ipipe_sync_root
 873
 874 _resume_kernel_from_int:
 875         r0.l = _sync_root_irqs
 876         r0.h = _sync_root_irqs
 877         [--sp] = rets;
 878         [--sp] = ( r7:4, p5:3 );
 879         SP += -12;
 880         call ___ipipe_call_irqtail
 881         SP += 12;
 882         ( r7:4, p5:3 ) = [sp++];
 883         rets = [sp++];
 884         rts
 885 #else
 886 #define _resume_kernel_from_int  2f
 887 #endif
 888
 889 ENTRY(_return_from_int)
 890         /* If someone else already raised IRQ 15, do nothing.  */
 891         csync;
 892         p2.l = lo(ILAT);
 893         p2.h = hi(ILAT);
 894         r0 = [p2];
 895         cc = bittst (r0, EVT_IVG15_P);
 896         if cc jump 2f;
 897
 898         /* if not return to user mode, get out */
 899         p2.l = lo(IPEND);
 900         p2.h = hi(IPEND);
 901         r0 = [p2];
 902         r1 = 0x17(Z);
 903         r2 = ~r1;
 904         r2.h = 0;
 905         r0 = r2 & r0;
 906         r1 = 1;
 907         r1 = r0 - r1;
 908         r2 = r0 & r1;
 909         cc = r2 == 0;
 910         if !cc jump _resume_kernel_from_int;
 911
 912         /* Lower the interrupt level to 15.  */
 913         p0.l = lo(EVT15);
 914         p0.h = hi(EVT15);
 915         p1.l = _schedule_and_signal_from_int;
 916         p1.h = _schedule_and_signal_from_int;
 917         [p0] = p1;
 918         csync;
 919 #if ANOMALY_05000281
 920         r0.l = lo(SAFE_USER_INSTRUCTION);
 921         r0.h = hi(SAFE_USER_INSTRUCTION);
 922         reti = r0;
 923 #endif
 924         r0 = 0x801f (z);
 925         STI r0;
 926         raise 15;       /* raise evt15 to do signal or reschedule */
 927         rti;
 928 2:
 929         rts;
 930 ENDPROC(_return_from_int)
 931
 932 ENTRY(_lower_to_irq14)
 933 #if ANOMALY_05000281
 934         r0.l = lo(SAFE_USER_INSTRUCTION);
 935         r0.h = hi(SAFE_USER_INSTRUCTION);
 936         reti = r0;
 937 #endif
 938         r0 = 0x401f;
 939         sti r0;
 940         raise 14;
 941         rti;
 942 ENTRY(_evt14_softirq)
 943 #ifdef CONFIG_DEBUG_HWERR
 944         r0 = 0x3f;
 945         sti r0;
 946 #else
 947         cli r0;
 948 #endif
 949         [--sp] = RETI;
 950         SP += 4;
 951         rts;
 952
 953 _schedule_and_signal_from_int:
 954         /* To end up here, vector 15 was changed - so we have to change it
 955          * back.
 956          */
 957         p0.l = lo(EVT15);
 958         p0.h = hi(EVT15);
 959         p1.l = _evt_system_call;
 960         p1.h = _evt_system_call;
 961         [p0] = p1;
 962         csync;
 963
 964         /* Set orig_p0 to -1 to indicate this isn't the end of a syscall.  */
 965         r0 = -1 (x);
 966         [sp + PT_ORIG_P0] = r0;
 967
 968         p1 = rets;
 969         [sp + PT_RESERVED] = p1;
 970
 971 #ifdef CONFIG_SMP
 972         GET_PDA(p0, r0);        /* Fetch current PDA (can't migrate to other CPU here) */
 973         r0 = [p0 + PDA_IRQFLAGS];
 974 #else
 975         p0.l = _bfin_irq_flags;
 976         p0.h = _bfin_irq_flags;
 977         r0 = [p0];
 978 #endif
 979         sti r0;
 980
 981         r0 = sp;
 982         sp += -12;
 983         call _finish_atomic_sections;
 984         sp += 12;
 985         jump.s .Lresume_userspace;
 986
 987 _schedule_and_signal:
 988         SAVE_CONTEXT_SYSCALL
 989         /* To end up here, vector 15 was changed - so we have to change it
 990          * back.
 991          */
 992         p0.l = lo(EVT15);
 993         p0.h = hi(EVT15);
 994         p1.l = _evt_system_call;
 995         p1.h = _evt_system_call;
 996         [p0] = p1;
 997         csync;
 998         p0.l = 1f;
 999         p0.h = 1f;
1000         [sp + PT_RESERVED] = P0;
1001         call .Lresume_userspace;
1002 1:
1003         RESTORE_CONTEXT
1004         rti;
1005 ENDPROC(_lower_to_irq14)
1006
1007 /* We handle this 100% in exception space - to reduce overhead
1008  * Only potiential problem is if the software buffer gets swapped out of the
1009  * CPLB table - then double fault. - so we don't let this happen in other places
1010  */
1011 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
1012 ENTRY(_ex_trace_buff_full)
1013         [--sp] = P3;
1014         [--sp] = P2;
1015         [--sp] = LC0;
1016         [--sp] = LT0;
1017         [--sp] = LB0;
1018         P5.L = _trace_buff_offset;
1019         P5.H = _trace_buff_offset;
1020         P3 = [P5];              /* trace_buff_offset */
1021         P5.L = lo(TBUFSTAT);
1022         P5.H = hi(TBUFSTAT);
1023         R7 = [P5];
1024         R7 <<= 1;               /* double, since we need to read twice */
1025         LC0 = R7;
1026         R7 <<= 2;               /* need to shift over again,
1027                                  * to get the number of bytes */
1028         P5.L = lo(TBUF);
1029         P5.H = hi(TBUF);
1030         R6 = ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*1024) - 1;
1031
1032         P2 = R7;
1033         P3 = P3 + P2;
1034         R7 = P3;
1035         R7 = R7 & R6;
1036         P3 = R7;
1037         P2.L = _trace_buff_offset;
1038         P2.H = _trace_buff_offset;
1039         [P2] = P3;
1040
1041         P2.L = _software_trace_buff;
1042         P2.H = _software_trace_buff;
1043
1044         LSETUP (.Lstart, .Lend) LC0;
1045 .Lstart:
1046         R7 = [P5];      /* read TBUF */
1047         P4 = P3 + P2;
1048         [P4] = R7;
1049         P3 += -4;
1050         R7 = P3;
1051         R7 = R7 & R6;
1052 .Lend:
1053         P3 = R7;
1054
1055         LB0 = [sp++];
1056         LT0 = [sp++];
1057         LC0 = [sp++];
1058         P2 = [sp++];
1059         P3 = [sp++];
1060         jump _bfin_return_from_exception;
1061 ENDPROC(_ex_trace_buff_full)
1062
1063 #if CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN == 4
1064 .data
1065 #else
1066 .section .l1.data.B
1067 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN */
1068 ENTRY(_trace_buff_offset)
1069         .long 0;
1070 ALIGN
1071 ENTRY(_software_trace_buff)
1072         .rept ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*256);
1073         .long 0
1074         .endr
1075 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND */
1076
1077 #if CONFIG_EARLY_PRINTK
1078 __INIT
1079 ENTRY(_early_trap)
1080         SAVE_ALL_SYS
1081         trace_buffer_stop(p0,r0);
1082
1083 #if ANOMALY_05000283 || ANOMALY_05000315
1084         cc = r5 == r5;
1085         p4.h = HI(CHIPID);
1086         p4.l = LO(CHIPID);
1087         if cc jump 1f;
1088         r5.l = W[p4];
1089 1:
1090 #endif
1091
1092         /* Turn caches off, to ensure we don't get double exceptions */
1093
1094         P4.L = LO(IMEM_CONTROL);
1095         P4.H = HI(IMEM_CONTROL);
1096
1097         R5 = [P4];              /* Control Register*/
1098         BITCLR(R5,ENICPLB_P);
1099         CLI R1;
1100         SSYNC;          /* SSYNC required before writing to IMEM_CONTROL. */
1101         .align 8;
1102         [P4] = R5;
1103         SSYNC;
1104
1105         P4.L = LO(DMEM_CONTROL);
1106         P4.H = HI(DMEM_CONTROL);
1107         R5 = [P4];
1108         BITCLR(R5,ENDCPLB_P);
1109         SSYNC;          /* SSYNC required before writing to DMEM_CONTROL. */
1110         .align 8;
1111         [P4] = R5;
1112         SSYNC;
1113         STI R1;
1114
1115         r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
1116         r1 = RETX;
1117
1118         SP += -12;
1119         call _early_trap_c;
1120         SP += 12;
1121 ENDPROC(_early_trap)
1122 __FINIT
1123 #endif /* CONFIG_EARLY_PRINTK */
1124
1125 /*
1126  * Put these in the kernel data section - that should always be covered by
1127  * a CPLB. This is needed to ensure we don't get double fault conditions
1128  */
1129
1130 #ifdef CONFIG_SYSCALL_TAB_L1
1131 .section .l1.data
1132 #else
1133 .data
1134 #endif
1135
1136 ENTRY(_ex_table)
1137         /* entry for each EXCAUSE[5:0]
1138          * This table must be in sync with the table in ./kernel/traps.c
1139          * EXCPT instruction can provide 4 bits of EXCAUSE, allowing 16 to be user defined
1140          */
1141         .long _ex_syscall       /* 0x00 - User Defined - Linux Syscall */
1142         .long _ex_trap_c        /* 0x01 - User Defined - Software breakpoint */
1143 #ifdef  CONFIG_KGDB
1144         .long _ex_trap_c        /* 0x02 - User Defined - KGDB initial connection
1145                                                          and break signal trap */
1146 #else
1147         .long _ex_replaceable   /* 0x02 - User Defined */
1148 #endif
1149         .long _ex_trap_c        /* 0x03 - User Defined - userspace stack overflow */
1150         .long _ex_trap_c        /* 0x04 - User Defined - dump trace buffer */
1151         .long _ex_replaceable   /* 0x05 - User Defined */
1152         .long _ex_replaceable   /* 0x06 - User Defined */
1153         .long _ex_replaceable   /* 0x07 - User Defined */
1154         .long _ex_replaceable   /* 0x08 - User Defined */
1155         .long _ex_replaceable   /* 0x09 - User Defined */
1156         .long _ex_replaceable   /* 0x0A - User Defined */
1157         .long _ex_replaceable   /* 0x0B - User Defined */
1158         .long _ex_replaceable   /* 0x0C - User Defined */
1159         .long _ex_replaceable   /* 0x0D - User Defined */
1160         .long _ex_replaceable   /* 0x0E - User Defined */
1161         .long _ex_replaceable   /* 0x0F - User Defined */
1162         .long _ex_single_step   /* 0x10 - HW Single step */
1163 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
1164         .long _ex_trace_buff_full /* 0x11 - Trace Buffer Full */
1165 #else
1166         .long _ex_trap_c        /* 0x11 - Trace Buffer Full */
1167 #endif
1168         .long _ex_trap_c        /* 0x12 - Reserved */
1169         .long _ex_trap_c        /* 0x13 - Reserved */
1170         .long _ex_trap_c        /* 0x14 - Reserved */
1171         .long _ex_trap_c        /* 0x15 - Reserved */
1172         .long _ex_trap_c        /* 0x16 - Reserved */
1173         .long _ex_trap_c        /* 0x17 - Reserved */
1174         .long _ex_trap_c        /* 0x18 - Reserved */
1175         .long _ex_trap_c        /* 0x19 - Reserved */
1176         .long _ex_trap_c        /* 0x1A - Reserved */
1177         .long _ex_trap_c        /* 0x1B - Reserved */
1178         .long _ex_trap_c        /* 0x1C - Reserved */
1179         .long _ex_trap_c        /* 0x1D - Reserved */
1180         .long _ex_trap_c        /* 0x1E - Reserved */
1181         .long _ex_trap_c        /* 0x1F - Reserved */
1182         .long _ex_trap_c        /* 0x20 - Reserved */
1183         .long _ex_trap_c        /* 0x21 - Undefined Instruction */
1184         .long _ex_trap_c        /* 0x22 - Illegal Instruction Combination */
1185         .long _ex_dviol         /* 0x23 - Data CPLB Protection Violation */
1186         .long _ex_trap_c        /* 0x24 - Data access misaligned */
1187         .long _ex_trap_c        /* 0x25 - Unrecoverable Event */
1188         .long _ex_dmiss         /* 0x26 - Data CPLB Miss */
1189         .long _ex_dmult         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero */
1190         .long _ex_trap_c        /* 0x28 - Emulation Watchpoint */
1191         .long _ex_trap_c        /* 0x29 - Instruction fetch access error (535 only) */
1192         .long _ex_trap_c        /* 0x2A - Instruction fetch misaligned */
1193         .long _ex_trap_c        /* 0x2B - Instruction CPLB protection Violation */
1194         .long _ex_icplb_miss    /* 0x2C - Instruction CPLB miss */
1195         .long _ex_trap_c        /* 0x2D - Instruction CPLB Multiple Hits */
1196         .long _ex_trap_c        /* 0x2E - Illegal use of Supervisor Resource */
1197         .long _ex_trap_c        /* 0x2E - Illegal use of Supervisor Resource */
1198         .long _ex_trap_c        /* 0x2F - Reserved */
1199         .long _ex_trap_c        /* 0x30 - Reserved */
1200         .long _ex_trap_c        /* 0x31 - Reserved */
1201         .long _ex_trap_c        /* 0x32 - Reserved */
1202         .long _ex_trap_c        /* 0x33 - Reserved */
1203         .long _ex_trap_c        /* 0x34 - Reserved */
1204         .long _ex_trap_c        /* 0x35 - Reserved */
1205         .long _ex_trap_c        /* 0x36 - Reserved */
1206         .long _ex_trap_c        /* 0x37 - Reserved */
1207         .long _ex_trap_c        /* 0x38 - Reserved */
1208         .long _ex_trap_c        /* 0x39 - Reserved */
1209         .long _ex_trap_c        /* 0x3A - Reserved */
1210         .long _ex_trap_c        /* 0x3B - Reserved */
1211         .long _ex_trap_c        /* 0x3C - Reserved */
1212         .long _ex_trap_c        /* 0x3D - Reserved */
1213         .long _ex_trap_c        /* 0x3E - Reserved */
1214         .long _ex_trap_c        /* 0x3F - Reserved */
1215 END(_ex_table)
1216
1217 ENTRY(_sys_call_table)
1218         .long _sys_restart_syscall      /* 0 */
1219         .long _sys_exit
1220         .long _sys_fork
1221         .long _sys_read
1222         .long _sys_write
1223         .long _sys_open         /* 5 */
1224         .long _sys_close
1225         .long _sys_ni_syscall   /* old waitpid */
1226         .long _sys_creat
1227         .long _sys_link
1228         .long _sys_unlink       /* 10 */
1229         .long _sys_execve
1230         .long _sys_chdir
1231         .long _sys_time
1232         .long _sys_mknod
1233         .long _sys_chmod                /* 15 */
1234         .long _sys_chown        /* chown16 */
1235         .long _sys_ni_syscall   /* old break syscall holder */
1236         .long _sys_ni_syscall   /* old stat */
1237         .long _sys_lseek
1238         .long _sys_getpid       /* 20 */
1239         .long _sys_mount
1240         .long _sys_ni_syscall   /* old umount */
1241         .long _sys_setuid
1242         .long _sys_getuid
1243         .long _sys_stime                /* 25 */
1244         .long _sys_ptrace
1245         .long _sys_alarm
1246         .long _sys_ni_syscall   /* old fstat */
1247         .long _sys_pause
1248         .long _sys_ni_syscall   /* old utime */ /* 30 */
1249         .long _sys_ni_syscall   /* old stty syscall holder */
1250         .long _sys_ni_syscall   /* old gtty syscall holder */
1251         .long _sys_access
1252         .long _sys_nice
1253         .long _sys_ni_syscall   /* 35 */ /* old ftime syscall holder */
1254         .long _sys_sync
1255         .long _sys_kill
1256         .long _sys_rename
1257         .long _sys_mkdir
1258         .long _sys_rmdir                /* 40 */
1259         .long _sys_dup
1260         .long _sys_pipe
1261         .long _sys_times
1262         .long _sys_ni_syscall   /* old prof syscall holder */
1263         .long _sys_brk          /* 45 */
1264         .long _sys_setgid
1265         .long _sys_getgid
1266         .long _sys_ni_syscall   /* old sys_signal */
1267         .long _sys_geteuid      /* geteuid16 */
1268         .long _sys_getegid      /* getegid16 */ /* 50 */
1269         .long _sys_acct
1270         .long _sys_umount       /* recycled never used phys() */
1271         .long _sys_ni_syscall   /* old lock syscall holder */
1272         .long _sys_ioctl
1273         .long _sys_fcntl                /* 55 */
1274         .long _sys_ni_syscall   /* old mpx syscall holder */
1275         .long _sys_setpgid
1276         .long _sys_ni_syscall   /* old ulimit syscall holder */
1277         .long _sys_ni_syscall   /* old old uname */
1278         .long _sys_umask                /* 60 */
1279         .long _sys_chroot
1280         .long _sys_ustat
1281         .long _sys_dup2
1282         .long _sys_getppid
1283         .long _sys_getpgrp      /* 65 */
1284         .long _sys_setsid
1285         .long _sys_ni_syscall   /* old sys_sigaction */
1286         .long _sys_sgetmask
1287         .long _sys_ssetmask
1288         .long _sys_setreuid     /* setreuid16 */        /* 70 */
1289         .long _sys_setregid     /* setregid16 */
1290         .long _sys_ni_syscall   /* old sys_sigsuspend */
1291         .long _sys_ni_syscall   /* old sys_sigpending */
1292         .long _sys_sethostname
1293         .long _sys_setrlimit    /* 75 */
1294         .long _sys_ni_syscall   /* old getrlimit */
1295         .long _sys_getrusage
1296         .long _sys_gettimeofday
1297         .long _sys_settimeofday
1298         .long _sys_getgroups    /* getgroups16 */       /* 80 */
1299         .long _sys_setgroups    /* setgroups16 */
1300         .long _sys_ni_syscall   /* old_select */
1301         .long _sys_symlink
1302         .long _sys_ni_syscall   /* old lstat */
1303         .long _sys_readlink     /* 85 */
1304         .long _sys_uselib
1305         .long _sys_ni_syscall   /* sys_swapon */
1306         .long _sys_reboot
1307         .long _sys_ni_syscall   /* old_readdir */
1308         .long _sys_ni_syscall   /* sys_mmap */  /* 90 */
1309         .long _sys_munmap
1310         .long _sys_truncate
1311         .long _sys_ftruncate
1312         .long _sys_fchmod
1313         .long _sys_fchown       /* fchown16 */  /* 95 */
1314         .long _sys_getpriority
1315         .long _sys_setpriority
1316         .long _sys_ni_syscall   /* old profil syscall holder */
1317         .long _sys_statfs
1318         .long _sys_fstatfs      /* 100 */
1319         .long _sys_ni_syscall
1320         .long _sys_ni_syscall   /* old sys_socketcall */
1321         .long _sys_syslog
1322         .long _sys_setitimer
1323         .long _sys_getitimer    /* 105 */
1324         .long _sys_newstat
1325         .long _sys_newlstat
1326         .long _sys_newfstat
1327         .long _sys_ni_syscall   /* old uname */
1328         .long _sys_ni_syscall   /* iopl for i386 */ /* 110 */
1329         .long _sys_vhangup
1330         .long _sys_ni_syscall   /* obsolete idle() syscall */
1331         .long _sys_ni_syscall   /* vm86old for i386 */
1332         .long _sys_wait4
1333         .long _sys_ni_syscall   /* 115 */ /* sys_swapoff */
1334         .long _sys_sysinfo
1335         .long _sys_ni_syscall   /* old sys_ipc */
1336         .long _sys_fsync
1337         .long _sys_ni_syscall   /* old sys_sigreturn */
1338         .long _sys_clone                /* 120 */
1339         .long _sys_setdomainname
1340         .long _sys_newuname
1341         .long _sys_ni_syscall   /* old sys_modify_ldt */
1342         .long _sys_adjtimex
1343         .long _sys_ni_syscall   /* 125 */ /* sys_mprotect */
1344         .long _sys_ni_syscall   /* old sys_sigprocmask */
1345         .long _sys_ni_syscall   /* old "creat_module" */
1346         .long _sys_init_module
1347         .long _sys_delete_module
1348         .long _sys_ni_syscall   /* 130: old "get_kernel_syms" */
1349         .long _sys_quotactl
1350         .long _sys_getpgid
1351         .long _sys_fchdir
1352         .long _sys_bdflush
1353         .long _sys_ni_syscall   /* 135 */ /* sys_sysfs */
1354         .long _sys_personality
1355         .long _sys_ni_syscall   /* for afs_syscall */
1356         .long _sys_setfsuid     /* setfsuid16 */
1357         .long _sys_setfsgid     /* setfsgid16 */
1358         .long _sys_llseek       /* 140 */
1359         .long _sys_getdents
1360         .long _sys_ni_syscall   /* sys_select */
1361         .long _sys_flock
1362         .long _sys_ni_syscall   /* sys_msync */
1363         .long _sys_readv                /* 145 */
1364         .long _sys_writev
1365         .long _sys_getsid
1366         .long _sys_fdatasync
1367         .long _sys_sysctl
1368         .long _sys_ni_syscall   /* 150 */ /* sys_mlock */
1369         .long _sys_ni_syscall   /* sys_munlock */
1370         .long _sys_ni_syscall   /* sys_mlockall */
1371         .long _sys_ni_syscall   /* sys_munlockall */
1372         .long _sys_sched_setparam
1373         .long _sys_sched_getparam /* 155 */
1374         .long _sys_sched_setscheduler
1375         .long _sys_sched_getscheduler
1376         .long _sys_sched_yield
1377         .long _sys_sched_get_priority_max
1378         .long _sys_sched_get_priority_min  /* 160 */
1379         .long _sys_sched_rr_get_interval
1380         .long _sys_nanosleep
1381         .long _sys_mremap
1382         .long _sys_setresuid    /* setresuid16 */
1383         .long _sys_getresuid    /* getresuid16 */       /* 165 */
1384         .long _sys_ni_syscall   /* for vm86 */
1385         .long _sys_ni_syscall   /* old "query_module" */
1386         .long _sys_ni_syscall   /* sys_poll */
1387         .long _sys_nfsservctl
1388         .long _sys_setresgid    /* setresgid16 */       /* 170 */
1389         .long _sys_getresgid    /* getresgid16 */
1390         .long _sys_prctl
1391         .long _sys_rt_sigreturn
1392         .long _sys_rt_sigaction
1393         .long _sys_rt_sigprocmask /* 175 */
1394         .long _sys_rt_sigpending
1395         .long _sys_rt_sigtimedwait
1396         .long _sys_rt_sigqueueinfo
1397         .long _sys_rt_sigsuspend
1398         .long _sys_pread64      /* 180 */
1399         .long _sys_pwrite64
1400         .long _sys_lchown       /* lchown16 */
1401         .long _sys_getcwd
1402         .long _sys_capget
1403         .long _sys_capset       /* 185 */
1404         .long _sys_sigaltstack
1405         .long _sys_sendfile
1406         .long _sys_ni_syscall   /* streams1 */
1407         .long _sys_ni_syscall   /* streams2 */
1408         .long _sys_vfork                /* 190 */
1409         .long _sys_getrlimit
1410         .long _sys_mmap2
1411         .long _sys_truncate64
1412         .long _sys_ftruncate64
1413         .long _sys_stat64       /* 195 */
1414         .long _sys_lstat64
1415         .long _sys_fstat64
1416         .long _sys_chown
1417         .long _sys_getuid
1418         .long _sys_getgid       /* 200 */
1419         .long _sys_geteuid
1420         .long _sys_getegid
1421         .long _sys_setreuid
1422         .long _sys_setregid
1423         .long _sys_getgroups    /* 205 */
1424         .long _sys_setgroups
1425         .long _sys_fchown
1426         .long _sys_setresuid
1427         .long _sys_getresuid
1428         .long _sys_setresgid    /* 210 */
1429         .long _sys_getresgid
1430         .long _sys_lchown
1431         .long _sys_setuid
1432         .long _sys_setgid
1433         .long _sys_setfsuid     /* 215 */
1434         .long _sys_setfsgid
1435         .long _sys_pivot_root
1436         .long _sys_ni_syscall   /* sys_mincore */
1437         .long _sys_ni_syscall   /* sys_madvise */
1438         .long _sys_getdents64   /* 220 */
1439         .long _sys_fcntl64
1440         .long _sys_ni_syscall   /* reserved for TUX */
1441         .long _sys_ni_syscall
1442         .long _sys_gettid
1443         .long _sys_readahead    /* 225 */
1444         .long _sys_setxattr
1445         .long _sys_lsetxattr
1446         .long _sys_fsetxattr
1447         .long _sys_getxattr
1448         .long _sys_lgetxattr    /* 230 */
1449         .long _sys_fgetxattr
1450         .long _sys_listxattr
1451         .long _sys_llistxattr
1452         .long _sys_flistxattr
1453         .long _sys_removexattr  /* 235 */
1454         .long _sys_lremovexattr
1455         .long _sys_fremovexattr
1456         .long _sys_tkill
1457         .long _sys_sendfile64
1458         .long _sys_futex                /* 240 */
1459         .long _sys_sched_setaffinity
1460         .long _sys_sched_getaffinity
1461         .long _sys_ni_syscall   /* sys_set_thread_area */
1462         .long _sys_ni_syscall   /* sys_get_thread_area */
1463         .long _sys_io_setup     /* 245 */
1464         .long _sys_io_destroy
1465         .long _sys_io_getevents
1466         .long _sys_io_submit
1467         .long _sys_io_cancel
1468         .long _sys_ni_syscall   /* 250 */ /* sys_alloc_hugepages */
1469         .long _sys_ni_syscall   /* sys_freec_hugepages */
1470         .long _sys_exit_group
1471         .long _sys_lookup_dcookie
1472         .long _sys_bfin_spinlock
1473         .long _sys_epoll_create /* 255 */
1474         .long _sys_epoll_ctl
1475         .long _sys_epoll_wait
1476         .long _sys_ni_syscall /* remap_file_pages */
1477         .long _sys_set_tid_address
1478         .long _sys_timer_create /* 260 */
1479         .long _sys_timer_settime
1480         .long _sys_timer_gettime
1481         .long _sys_timer_getoverrun
1482         .long _sys_timer_delete
1483         .long _sys_clock_settime /* 265 */
1484         .long _sys_clock_gettime
1485         .long _sys_clock_getres
1486         .long _sys_clock_nanosleep
1487         .long _sys_statfs64
1488         .long _sys_fstatfs64    /* 270 */
1489         .long _sys_tgkill
1490         .long _sys_utimes
1491         .long _sys_fadvise64_64
1492         .long _sys_ni_syscall /* vserver */
1493         .long _sys_ni_syscall /* 275, mbind */
1494         .long _sys_ni_syscall /* get_mempolicy */
1495         .long _sys_ni_syscall /* set_mempolicy */
1496         .long _sys_mq_open
1497         .long _sys_mq_unlink
1498         .long _sys_mq_timedsend /* 280 */
1499         .long _sys_mq_timedreceive
1500         .long _sys_mq_notify
1501         .long _sys_mq_getsetattr
1502         .long _sys_ni_syscall /* kexec_load */
1503         .long _sys_waitid       /* 285 */
1504         .long _sys_add_key
1505         .long _sys_request_key
1506         .long _sys_keyctl
1507         .long _sys_ioprio_set
1508         .long _sys_ioprio_get   /* 290 */
1509         .long _sys_inotify_init
1510         .long _sys_inotify_add_watch
1511         .long _sys_inotify_rm_watch
1512         .long _sys_ni_syscall /* migrate_pages */
1513         .long _sys_openat       /* 295 */
1514         .long _sys_mkdirat
1515         .long _sys_mknodat
1516         .long _sys_fchownat
1517         .long _sys_futimesat
1518         .long _sys_fstatat64    /* 300 */
1519         .long _sys_unlinkat
1520         .long _sys_renameat
1521         .long _sys_linkat
1522         .long _sys_symlinkat
1523         .long _sys_readlinkat   /* 305 */
1524         .long _sys_fchmodat
1525         .long _sys_faccessat
1526         .long _sys_pselect6
1527         .long _sys_ppoll
1528         .long _sys_unshare      /* 310 */
1529         .long _sys_sram_alloc
1530         .long _sys_sram_free
1531         .long _sys_dma_memcpy
1532         .long _sys_accept
1533         .long _sys_bind         /* 315 */
1534         .long _sys_connect
1535         .long _sys_getpeername
1536         .long _sys_getsockname
1537         .long _sys_getsockopt
1538         .long _sys_listen       /* 320 */
1539         .long _sys_recv
1540         .long _sys_recvfrom
1541         .long _sys_recvmsg
1542         .long _sys_send
1543         .long _sys_sendmsg      /* 325 */
1544         .long _sys_sendto
1545         .long _sys_setsockopt
1546         .long _sys_shutdown
1547         .long _sys_socket
1548         .long _sys_socketpair   /* 330 */
1549         .long _sys_semctl
1550         .long _sys_semget
1551         .long _sys_semop
1552         .long _sys_msgctl
1553         .long _sys_msgget       /* 335 */
1554         .long _sys_msgrcv
1555         .long _sys_msgsnd
1556         .long _sys_shmat
1557         .long _sys_shmctl
1558         .long _sys_shmdt        /* 340 */
1559         .long _sys_shmget
1560         .long _sys_splice
1561         .long _sys_sync_file_range
1562         .long _sys_tee
1563         .long _sys_vmsplice     /* 345 */
1564         .long _sys_epoll_pwait
1565         .long _sys_utimensat
1566         .long _sys_signalfd
1567         .long _sys_timerfd_create
1568         .long _sys_eventfd      /* 350 */
1569         .long _sys_pread64
1570         .long _sys_pwrite64
1571         .long _sys_fadvise64
1572         .long _sys_set_robust_list
1573         .long _sys_get_robust_list      /* 355 */
1574         .long _sys_fallocate
1575         .long _sys_semtimedop
1576         .long _sys_timerfd_settime
1577         .long _sys_timerfd_gettime
1578         .long _sys_signalfd4            /* 360 */
1579         .long _sys_eventfd2
1580         .long _sys_epoll_create1
1581         .long _sys_dup3
1582         .long _sys_pipe2
1583         .long _sys_inotify_init1        /* 365 */
1584
1585         .rept NR_syscalls-(.-_sys_call_table)/4
1586         .long _sys_ni_syscall
1587         .endr
1588 END(_sys_call_table)
1589
1590 #ifdef CONFIG_EXCEPTION_L1_SCRATCH
1591 /* .section .l1.bss.scratch */
1592 .set _exception_stack_top, L1_SCRATCH_START + L1_SCRATCH_LENGTH
1593 #else
1594 #ifdef CONFIG_SYSCALL_TAB_L1
1595 .section .l1.bss
1596 #else
1597 .bss
1598 #endif
1599 ENTRY(_exception_stack)
1600         .rept 1024 * NR_CPUS
1601         .long 0
1602         .endr
1603 _exception_stack_top:
1604 #endif