arch/i386/kernel/entry.S

   1 /*
   2  *  linux/arch/i386/entry.S
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /*
   8  * entry.S contains the system-call and fault low-level handling routines.
   9  * This also contains the timer-interrupt handler, as well as all interrupts
  10  * and faults that can result in a task-switch.
  11  *
  12  * NOTE: This code handles signal-recognition, which happens every time
  13  * after a timer-interrupt and after each system call.
  14  *
  15  * I changed all the .align's to 4 (16 byte alignment), as that's faster
  16  * on a 486.
  17  *
  18  * Stack layout in 'ret_from_system_call':
  19  *      ptrace needs to have all regs on the stack.
  20  *      if the order here is changed, it needs to be
  21  *      updated in fork.c:copy_process, signal.c:do_signal,
  22  *      ptrace.c and ptrace.h
  23  *
  24  *       0(%esp) - %ebx
  25  *       4(%esp) - %ecx
  26  *       8(%esp) - %edx
  27  *       C(%esp) - %esi
  28  *      10(%esp) - %edi
  29  *      14(%esp) - %ebp
  30  *      18(%esp) - %eax
  31  *      1C(%esp) - %ds
  32  *      20(%esp) - %es
  33  *      24(%esp) - orig_eax
  34  *      28(%esp) - %eip
  35  *      2C(%esp) - %cs
  36  *      30(%esp) - %eflags
  37  *      34(%esp) - %oldesp
  38  *      38(%esp) - %oldss
  39  *
  40  * "current" is in register %ebx during any slow entries.
  41  */
  42
  43 #include <linux/config.h>
  44 #include <linux/linkage.h>
  45 #include <asm/thread_info.h>
  46 #include <asm/errno.h>
  47 #include <asm/segment.h>
  48 #include <asm/smp.h>
  49 #include <asm/page.h>
  50 #include <asm/desc.h>
  51 #include "irq_vectors.h"
  52
  53 #define nr_syscalls ((syscall_table_size)/4)
  54
  55 EBX             = 0x00
  56 ECX             = 0x04
  57 EDX             = 0x08
  58 ESI             = 0x0C
  59 EDI             = 0x10
  60 EBP             = 0x14
  61 EAX             = 0x18
  62 DS              = 0x1C
  63 ES              = 0x20
  64 ORIG_EAX        = 0x24
  65 EIP             = 0x28
  66 CS              = 0x2C
  67 EFLAGS          = 0x30
  68 OLDESP          = 0x34
  69 OLDSS           = 0x38
  70
  71 CF_MASK         = 0x00000001
  72 TF_MASK         = 0x00000100
  73 IF_MASK         = 0x00000200
  74 DF_MASK         = 0x00000400
  75 NT_MASK         = 0x00004000
  76 VM_MASK         = 0x00020000
  77
  78 #ifdef CONFIG_PREEMPT
  79 #define preempt_stop            cli
  80 #else
  81 #define preempt_stop
  82 #define resume_kernel           restore_nocheck
  83 #endif
  84
  85 #define SAVE_ALL \
  86         cld; \
  87         pushl %es; \
  88         pushl %ds; \
  89         pushl %eax; \
  90         pushl %ebp; \
  91         pushl %edi; \
  92         pushl %esi; \
  93         pushl %edx; \
  94         pushl %ecx; \
  95         pushl %ebx; \
  96         movl $(__USER_DS), %edx; \
  97         movl %edx, %ds; \
  98         movl %edx, %es;
  99
 100 #define RESTORE_INT_REGS \
 101         popl %ebx;      \
 102         popl %ecx;      \
 103         popl %edx;      \
 104         popl %esi;      \
 105         popl %edi;      \
 106         popl %ebp;      \
 107         popl %eax
 108
 109 #define RESTORE_REGS    \
 110         RESTORE_INT_REGS; \
 111 1:      popl %ds;       \
 112 2:      popl %es;       \
 113 .section .fixup,"ax";   \
 114 3:      movl $0,(%esp); \
 115         jmp 1b;         \
 116 4:      movl $0,(%esp); \
 117         jmp 2b;         \
 118 .previous;              \
 119 .section __ex_table,"a";\
 120         .align 4;       \
 121         .long 1b,3b;    \
 122         .long 2b,4b;    \
 123 .previous
 124
 125
 126 ENTRY(ret_from_fork)
 127         pushl %eax
 128         call schedule_tail
 129         GET_THREAD_INFO(%ebp)
 130         popl %eax
 131         jmp syscall_exit
 132
 133 /*
 134  * Return to user mode is not as complex as all this looks,
 135  * but we want the default path for a system call return to
 136  * go as quickly as possible which is why some of this is
 137  * less clear than it otherwise should be.
 138  */
 139
 140         # userspace resumption stub bypassing syscall exit tracing
 141         ALIGN
 142 ret_from_exception:
 143         preempt_stop
 144 ret_from_intr:
 145         GET_THREAD_INFO(%ebp)
 146         movl EFLAGS(%esp), %eax         # mix EFLAGS and CS
 147         movb CS(%esp), %al
 148         testl $(VM_MASK | 3), %eax
 149         jz resume_kernel
 150 ENTRY(resume_userspace)
 151         cli                             # make sure we don't miss an interrupt
 152                                         # setting need_resched or sigpending
 153                                         # between sampling and the iret
 154         movl TI_flags(%ebp), %ecx
 155         andl $_TIF_WORK_MASK, %ecx      # is there any work to be done on
 156                                         # int/exception return?
 157         jne work_pending
 158         jmp restore_all
 159
 160 #ifdef CONFIG_PREEMPT
 161 ENTRY(resume_kernel)
 162         cli
 163         cmpl $0,TI_preempt_count(%ebp)  # non-zero preempt_count ?
 164         jnz restore_nocheck
 165 need_resched:
 166         movl TI_flags(%ebp), %ecx       # need_resched set ?
 167         testb $_TIF_NEED_RESCHED, %cl
 168         jz restore_all
 169         testl $IF_MASK,EFLAGS(%esp)     # interrupts off (exception path) ?
 170         jz restore_all
 171         call preempt_schedule_irq
 172         jmp need_resched
 173 #endif
 174
 175 /* SYSENTER_RETURN points to after the "sysenter" instruction in
 176    the vsyscall page.  See vsyscall-sysentry.S, which defines the symbol.  */
 177
 178         # sysenter call handler stub
 179 ENTRY(sysenter_entry)
 180         movl TSS_sysenter_esp0(%esp),%esp
 181 sysenter_past_esp:
 182         sti
 183         pushl $(__USER_DS)
 184         pushl %ebp
 185         pushfl
 186         pushl $(__USER_CS)
 187         pushl $SYSENTER_RETURN
 188
 189 /*
 190  * Load the potential sixth argument from user stack.
 191  * Careful about security.
 192  */
 193         cmpl $__PAGE_OFFSET-3,%ebp
 194         jae syscall_fault
 195 1:      movl (%ebp),%ebp
 196 .section __ex_table,"a"
 197         .align 4
 198         .long 1b,syscall_fault
 199 .previous
 200
 201         pushl %eax
 202         SAVE_ALL
 203         GET_THREAD_INFO(%ebp)
 204
 205         /* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */
 206         testw $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),TI_flags(%ebp)
 207         jnz syscall_trace_entry
 208         cmpl $(nr_syscalls), %eax
 209         jae syscall_badsys
 210         call *sys_call_table(,%eax,4)
 211         movl %eax,EAX(%esp)
 212         cli
 213         movl TI_flags(%ebp), %ecx
 214         testw $_TIF_ALLWORK_MASK, %cx
 215         jne syscall_exit_work
 216 /* if something modifies registers it must also disable sysexit */
 217         movl EIP(%esp), %edx
 218         movl OLDESP(%esp), %ecx
 219         xorl %ebp,%ebp
 220         sti
 221         sysexit
 222
 223
 224         # system call handler stub
 225 ENTRY(system_call)
 226         pushl %eax                      # save orig_eax
 227         SAVE_ALL
 228         GET_THREAD_INFO(%ebp)
 229                                         # system call tracing in operation
 230         /* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */
 231         testw $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),TI_flags(%ebp)
 232         jnz syscall_trace_entry
 233         cmpl $(nr_syscalls), %eax
 234         jae syscall_badsys
 235 syscall_call:
 236         call *sys_call_table(,%eax,4)
 237         movl %eax,EAX(%esp)             # store the return value
 238 syscall_exit:
 239         cli                             # make sure we don't miss an interrupt
 240                                         # setting need_resched or sigpending
 241                                         # between sampling and the iret
 242         movl TI_flags(%ebp), %ecx
 243         testw $_TIF_ALLWORK_MASK, %cx   # current->work
 244         jne syscall_exit_work
 245
 246 restore_all:
 247         movl EFLAGS(%esp), %eax         # mix EFLAGS, SS and CS
 248         movb OLDSS(%esp), %ah
 249         movb CS(%esp), %al
 250         andl $(VM_MASK | (4 << 8) | 3), %eax
 251         cmpl $((4 << 8) | 3), %eax
 252         je ldt_ss                       # returning to user-space with LDT SS
 253 restore_nocheck:
 254         RESTORE_REGS
 255         addl $4, %esp
 256 1:      iret
 257 .section .fixup,"ax"
 258 iret_exc:
 259         sti
 260         movl $__USER_DS, %edx
 261         movl %edx, %ds
 262         movl %edx, %es
 263         movl $11,%eax
 264         call do_exit
 265 .previous
 266 .section __ex_table,"a"
 267         .align 4
 268         .long 1b,iret_exc
 269 .previous
 270
 271 ldt_ss:
 272         larl OLDSS(%esp), %eax
 273         jnz restore_nocheck
 274         testl $0x00400000, %eax         # returning to 32bit stack?
 275         jnz restore_nocheck             # allright, normal return
 276         /* If returning to userspace with 16bit stack,
 277          * try to fix the higher word of ESP, as the CPU
 278          * won't restore it.
 279          * This is an "official" bug of all the x86-compatible
 280          * CPUs, which we can try to work around to make
 281          * dosemu and wine happy. */
 282         subl $8, %esp           # reserve space for switch16 pointer
 283         cli
 284         movl %esp, %eax
 285         /* Set up the 16bit stack frame with switch32 pointer on top,
 286          * and a switch16 pointer on top of the current frame. */
 287         call setup_x86_bogus_stack
 288         RESTORE_REGS
 289         lss 20+4(%esp), %esp    # switch to 16bit stack
 290 1:      iret
 291 .section __ex_table,"a"
 292         .align 4
 293         .long 1b,iret_exc
 294 .previous
 295
 296         # perform work that needs to be done immediately before resumption
 297         ALIGN
 298 work_pending:
 299         testb $_TIF_NEED_RESCHED, %cl
 300         jz work_notifysig
 301 work_resched:
 302         call schedule
 303         cli                             # make sure we don't miss an interrupt
 304                                         # setting need_resched or sigpending
 305                                         # between sampling and the iret
 306         movl TI_flags(%ebp), %ecx
 307         andl $_TIF_WORK_MASK, %ecx      # is there any work to be done other
 308                                         # than syscall tracing?
 309         jz restore_all
 310         testb $_TIF_NEED_RESCHED, %cl
 311         jnz work_resched
 312
 313 work_notifysig:                         # deal with pending signals and
 314                                         # notify-resume requests
 315         testl $VM_MASK, EFLAGS(%esp)
 316         movl %esp, %eax
 317         jne work_notifysig_v86          # returning to kernel-space or
 318                                         # vm86-space
 319         xorl %edx, %edx
 320         call do_notify_resume
 321         jmp restore_all
 322
 323         ALIGN
 324 work_notifysig_v86:
 325         pushl %ecx                      # save ti_flags for do_notify_resume
 326         call save_v86_state             # %eax contains pt_regs pointer
 327         popl %ecx
 328         movl %eax, %esp
 329         xorl %edx, %edx
 330         call do_notify_resume
 331         jmp restore_all
 332
 333         # perform syscall exit tracing
 334         ALIGN
 335 syscall_trace_entry:
 336         movl $-ENOSYS,EAX(%esp)
 337         movl %esp, %eax
 338         xorl %edx,%edx
 339         call do_syscall_trace
 340         movl ORIG_EAX(%esp), %eax
 341         cmpl $(nr_syscalls), %eax
 342         jnae syscall_call
 343         jmp syscall_exit
 344
 345         # perform syscall exit tracing
 346         ALIGN
 347 syscall_exit_work:
 348         testb $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP), %cl
 349         jz work_pending
 350         sti                             # could let do_syscall_trace() call
 351                                         # schedule() instead
 352         movl %esp, %eax
 353         movl $1, %edx
 354         call do_syscall_trace
 355         jmp resume_userspace
 356
 357         ALIGN
 358 syscall_fault:
 359         pushl %eax                      # save orig_eax
 360         SAVE_ALL
 361         GET_THREAD_INFO(%ebp)
 362         movl $-EFAULT,EAX(%esp)
 363         jmp resume_userspace
 364
 365         ALIGN
 366 syscall_badsys:
 367         movl $-ENOSYS,EAX(%esp)
 368         jmp resume_userspace
 369
 370 #define FIXUP_ESPFIX_STACK \
 371         movl %esp, %eax; \
 372         /* switch to 32bit stack using the pointer on top of 16bit stack */ \
 373         lss %ss:CPU_16BIT_STACK_SIZE-8, %esp; \
 374         /* copy data from 16bit stack to 32bit stack */ \
 375         call fixup_x86_bogus_stack; \
 376         /* put ESP to the proper location */ \
 377         movl %eax, %esp;
 378 #define UNWIND_ESPFIX_STACK \
 379         pushl %eax; \
 380         movl %ss, %eax; \
 381         /* see if on 16bit stack */ \
 382         cmpw $__ESPFIX_SS, %ax; \
 383         jne 28f; \
 384         movl $__KERNEL_DS, %edx; \
 385         movl %edx, %ds; \
 386         movl %edx, %es; \
 387         /* switch to 32bit stack */ \
 388         FIXUP_ESPFIX_STACK \
 389 28:     popl %eax;
 390
 391 /*
 392  * Build the entry stubs and pointer table with
 393  * some assembler magic.
 394  */
 395 .data
 396 ENTRY(interrupt)
 397 .text
 398
 399 vector=0
 400 ENTRY(irq_entries_start)
 401 .rept NR_IRQS
 402         ALIGN
 403 1:      pushl $vector-256
 404         jmp common_interrupt
 405 .data
 406         .long 1b
 407 .text
 408 vector=vector+1
 409 .endr
 410
 411         ALIGN
 412 common_interrupt:
 413         SAVE_ALL
 414         movl %esp,%eax
 415         call do_IRQ
 416         jmp ret_from_intr
 417
 418 #define BUILD_INTERRUPT(name, nr)       \
 419 ENTRY(name)                             \
 420         pushl $nr-256;                  \
 421         SAVE_ALL                        \
 422         movl %esp,%eax;                 \
 423         call smp_/**/name;              \
 424         jmp ret_from_intr;
 425
 426 /* The include is where all of the SMP etc. interrupts come from */
 427 #include "entry_arch.h"
 428
 429 ENTRY(divide_error)
 430         pushl $0                        # no error code
 431         pushl $do_divide_error
 432         ALIGN
 433 error_code:
 434         pushl %ds
 435         pushl %eax
 436         xorl %eax, %eax
 437         pushl %ebp
 438         pushl %edi
 439         pushl %esi
 440         pushl %edx
 441         decl %eax                       # eax = -1
 442         pushl %ecx
 443         pushl %ebx
 444         cld
 445         pushl %es
 446         UNWIND_ESPFIX_STACK
 447         popl %ecx
 448         movl ES(%esp), %edi             # get the function address
 449         movl ORIG_EAX(%esp), %edx       # get the error code
 450         movl %eax, ORIG_EAX(%esp)
 451         movl %ecx, ES(%esp)
 452         movl $(__USER_DS), %ecx
 453         movl %ecx, %ds
 454         movl %ecx, %es
 455         movl %esp,%eax                  # pt_regs pointer
 456         call *%edi
 457         jmp ret_from_exception
 458
 459 ENTRY(coprocessor_error)
 460         pushl $0
 461         pushl $do_coprocessor_error
 462         jmp error_code
 463
 464 ENTRY(simd_coprocessor_error)
 465         pushl $0
 466         pushl $do_simd_coprocessor_error
 467         jmp error_code
 468
 469 ENTRY(device_not_available)
 470         pushl $-1                       # mark this as an int
 471         SAVE_ALL
 472         movl %cr0, %eax
 473         testl $0x4, %eax                # EM (math emulation bit)
 474         jne device_not_available_emulate
 475         preempt_stop
 476         call math_state_restore
 477         jmp ret_from_exception
 478 device_not_available_emulate:
 479         pushl $0                        # temporary storage for ORIG_EIP
 480         call math_emulate
 481         addl $4, %esp
 482         jmp ret_from_exception
 483
 484 /*
 485  * Debug traps and NMI can happen at the one SYSENTER instruction
 486  * that sets up the real kernel stack. Check here, since we can't
 487  * allow the wrong stack to be used.
 488  *
 489  * "TSS_sysenter_esp0+12" is because the NMI/debug handler will have
 490  * already pushed 3 words if it hits on the sysenter instruction:
 491  * eflags, cs and eip.
 492  *
 493  * We just load the right stack, and push the three (known) values
 494  * by hand onto the new stack - while updating the return eip past
 495  * the instruction that would have done it for sysenter.
 496  */
 497 #define FIX_STACK(offset, ok, label)            \
 498         cmpw $__KERNEL_CS,4(%esp);              \
 499         jne ok;                                 \
 500 label:                                          \
 501         movl TSS_sysenter_esp0+offset(%esp),%esp;       \
 502         pushfl;                                 \
 503         pushl $__KERNEL_CS;                     \
 504         pushl $sysenter_past_esp
 505
 506 ENTRY(debug)
 507         cmpl $sysenter_entry,(%esp)
 508         jne debug_stack_correct
 509         FIX_STACK(12, debug_stack_correct, debug_esp_fix_insn)
 510 debug_stack_correct:
 511         pushl $-1                       # mark this as an int
 512         SAVE_ALL
 513         xorl %edx,%edx                  # error code 0
 514         movl %esp,%eax                  # pt_regs pointer
 515         call do_debug
 516         testl %eax,%eax
 517         jnz restore_all
 518         jmp ret_from_exception
 519
 520 /*
 521  * NMI is doubly nasty. It can happen _while_ we're handling
 522  * a debug fault, and the debug fault hasn't yet been able to
 523  * clear up the stack. So we first check whether we got  an
 524  * NMI on the sysenter entry path, but after that we need to
 525  * check whether we got an NMI on the debug path where the debug
 526  * fault happened on the sysenter path.
 527  */
 528 ENTRY(nmi)
 529         pushl %eax
 530         movl %ss, %eax
 531         cmpw $__ESPFIX_SS, %ax
 532         popl %eax
 533         je nmi_16bit_stack
 534         cmpl $sysenter_entry,(%esp)
 535         je nmi_stack_fixup
 536         pushl %eax
 537         movl %esp,%eax
 538         /* Do not access memory above the end of our stack page,
 539          * it might not exist.
 540          */
 541         andl $(THREAD_SIZE-1),%eax
 542         cmpl $(THREAD_SIZE-20),%eax
 543         popl %eax
 544         jae nmi_stack_correct
 545         cmpl $sysenter_entry,12(%esp)
 546         je nmi_debug_stack_check
 547 nmi_stack_correct:
 548         pushl %eax
 549         SAVE_ALL
 550         xorl %edx,%edx          # zero error code
 551         movl %esp,%eax          # pt_regs pointer
 552         call do_nmi
 553         jmp restore_all
 554
 555 nmi_stack_fixup:
 556         FIX_STACK(12,nmi_stack_correct, 1)
 557         jmp nmi_stack_correct
 558 nmi_debug_stack_check:
 559         cmpw $__KERNEL_CS,16(%esp)
 560         jne nmi_stack_correct
 561         cmpl $debug - 1,(%esp)
 562         jle nmi_stack_correct
 563         cmpl $debug_esp_fix_insn,(%esp)
 564         jle nmi_debug_stack_fixup
 565 nmi_debug_stack_fixup:
 566         FIX_STACK(24,nmi_stack_correct, 1)
 567         jmp nmi_stack_correct
 568
 569 nmi_16bit_stack:
 570         /* create the pointer to lss back */
 571         pushl %ss
 572         pushl %esp
 573         movzwl %sp, %esp
 574         addw $4, (%esp)
 575         /* copy the iret frame of 12 bytes */
 576         .rept 3
 577         pushl 16(%esp)
 578         .endr
 579         pushl %eax
 580         SAVE_ALL
 581         FIXUP_ESPFIX_STACK              # %eax == %esp
 582         xorl %edx,%edx                  # zero error code
 583         call do_nmi
 584         RESTORE_REGS
 585         lss 12+4(%esp), %esp            # back to 16bit stack
 586 1:      iret
 587 .section __ex_table,"a"
 588         .align 4
 589         .long 1b,iret_exc
 590 .previous
 591
 592 ENTRY(int3)
 593         pushl $-1                       # mark this as an int
 594         SAVE_ALL
 595         xorl %edx,%edx          # zero error code
 596         movl %esp,%eax          # pt_regs pointer
 597         call do_int3
 598         testl %eax,%eax
 599         jnz restore_all
 600         jmp ret_from_exception
 601
 602 ENTRY(overflow)
 603         pushl $0
 604         pushl $do_overflow
 605         jmp error_code
 606
 607 ENTRY(bounds)
 608         pushl $0
 609         pushl $do_bounds
 610         jmp error_code
 611
 612 ENTRY(invalid_op)
 613         pushl $0
 614         pushl $do_invalid_op
 615         jmp error_code
 616
 617 ENTRY(coprocessor_segment_overrun)
 618         pushl $0
 619         pushl $do_coprocessor_segment_overrun
 620         jmp error_code
 621
 622 ENTRY(invalid_TSS)
 623         pushl $do_invalid_TSS
 624         jmp error_code
 625
 626 ENTRY(segment_not_present)
 627         pushl $do_segment_not_present
 628         jmp error_code
 629
 630 ENTRY(stack_segment)
 631         pushl $do_stack_segment
 632         jmp error_code
 633
 634 ENTRY(general_protection)
 635         pushl $do_general_protection
 636         jmp error_code
 637
 638 ENTRY(alignment_check)
 639         pushl $do_alignment_check
 640         jmp error_code
 641
 642 ENTRY(page_fault)
 643         pushl $do_page_fault
 644         jmp error_code
 645
 646 #ifdef CONFIG_X86_MCE
 647 ENTRY(machine_check)
 648         pushl $0
 649         pushl machine_check_vector
 650         jmp error_code
 651 #endif
 652
 653 ENTRY(spurious_interrupt_bug)
 654         pushl $0
 655         pushl $do_spurious_interrupt_bug
 656         jmp error_code
 657
 658 .data
 659 ENTRY(sys_call_table)
 660         .long sys_restart_syscall       /* 0 - old "setup()" system call, used for restarting */
 661         .long sys_exit
 662         .long sys_fork
 663         .long sys_read
 664         .long sys_write
 665         .long sys_open          /* 5 */
 666         .long sys_close
 667         .long sys_waitpid
 668         .long sys_creat
 669         .long sys_link
 670         .long sys_unlink        /* 10 */
 671         .long sys_execve
 672         .long sys_chdir
 673         .long sys_time
 674         .long sys_mknod
 675         .long sys_chmod         /* 15 */
 676         .long sys_lchown16
 677         .long sys_ni_syscall    /* old break syscall holder */
 678         .long sys_stat
 679         .long sys_lseek
 680         .long sys_getpid        /* 20 */
 681         .long sys_mount
 682         .long sys_oldumount
 683         .long sys_setuid16
 684         .long sys_getuid16
 685         .long sys_stime         /* 25 */
 686         .long sys_ptrace
 687         .long sys_alarm
 688         .long sys_fstat
 689         .long sys_pause
 690         .long sys_utime         /* 30 */
 691         .long sys_ni_syscall    /* old stty syscall holder */
 692         .long sys_ni_syscall    /* old gtty syscall holder */
 693         .long sys_access
 694         .long sys_nice
 695         .long sys_ni_syscall    /* 35 - old ftime syscall holder */
 696         .long sys_sync
 697         .long sys_kill
 698         .long sys_rename
 699         .long sys_mkdir
 700         .long sys_rmdir         /* 40 */
 701         .long sys_dup
 702         .long sys_pipe
 703         .long sys_times
 704         .long sys_ni_syscall    /* old prof syscall holder */
 705         .long sys_brk           /* 45 */
 706         .long sys_setgid16
 707         .long sys_getgid16
 708         .long sys_signal
 709         .long sys_geteuid16
 710         .long sys_getegid16     /* 50 */
 711         .long sys_acct
 712         .long sys_umount        /* recycled never used phys() */
 713         .long sys_ni_syscall    /* old lock syscall holder */
 714         .long sys_ioctl
 715         .long sys_fcntl         /* 55 */
 716         .long sys_ni_syscall    /* old mpx syscall holder */
 717         .long sys_setpgid
 718         .long sys_ni_syscall    /* old ulimit syscall holder */
 719         .long sys_olduname
 720         .long sys_umask         /* 60 */
 721         .long sys_chroot
 722         .long sys_ustat
 723         .long sys_dup2
 724         .long sys_getppid
 725         .long sys_getpgrp       /* 65 */
 726         .long sys_setsid
 727         .long sys_sigaction
 728         .long sys_sgetmask
 729         .long sys_ssetmask
 730         .long sys_setreuid16    /* 70 */
 731         .long sys_setregid16
 732         .long sys_sigsuspend
 733         .long sys_sigpending
 734         .long sys_sethostname
 735         .long sys_setrlimit     /* 75 */
 736         .long sys_old_getrlimit
 737         .long sys_getrusage
 738         .long sys_gettimeofday
 739         .long sys_settimeofday
 740         .long sys_getgroups16   /* 80 */
 741         .long sys_setgroups16
 742         .long old_select
 743         .long sys_symlink
 744         .long sys_lstat
 745         .long sys_readlink      /* 85 */
 746         .long sys_uselib
 747         .long sys_swapon
 748         .long sys_reboot
 749         .long old_readdir
 750         .long old_mmap          /* 90 */
 751         .long sys_munmap
 752         .long sys_truncate
 753         .long sys_ftruncate
 754         .long sys_fchmod
 755         .long sys_fchown16      /* 95 */
 756         .long sys_getpriority
 757         .long sys_setpriority
 758         .long sys_ni_syscall    /* old profil syscall holder */
 759         .long sys_statfs
 760         .long sys_fstatfs       /* 100 */
 761         .long sys_ioperm
 762         .long sys_socketcall
 763         .long sys_syslog
 764         .long sys_setitimer
 765         .long sys_getitimer     /* 105 */
 766         .long sys_newstat
 767         .long sys_newlstat
 768         .long sys_newfstat
 769         .long sys_uname
 770         .long sys_iopl          /* 110 */
 771         .long sys_vhangup
 772         .long sys_ni_syscall    /* old "idle" system call */
 773         .long sys_vm86old
 774         .long sys_wait4
 775         .long sys_swapoff       /* 115 */
 776         .long sys_sysinfo
 777         .long sys_ipc
 778         .long sys_fsync
 779         .long sys_sigreturn
 780         .long sys_clone         /* 120 */
 781         .long sys_setdomainname
 782         .long sys_newuname
 783         .long sys_modify_ldt
 784         .long sys_adjtimex
 785         .long sys_mprotect      /* 125 */
 786         .long sys_sigprocmask
 787         .long sys_ni_syscall    /* old "create_module" */
 788         .long sys_init_module
 789         .long sys_delete_module
 790         .long sys_ni_syscall    /* 130: old "get_kernel_syms" */
 791         .long sys_quotactl
 792         .long sys_getpgid
 793         .long sys_fchdir
 794         .long sys_bdflush
 795         .long sys_sysfs         /* 135 */
 796         .long sys_personality
 797         .long sys_ni_syscall    /* reserved for afs_syscall */
 798         .long sys_setfsuid16
 799         .long sys_setfsgid16
 800         .long sys_llseek        /* 140 */
 801         .long sys_getdents
 802         .long sys_select
 803         .long sys_flock
 804         .long sys_msync
 805         .long sys_readv         /* 145 */
 806         .long sys_writev
 807         .long sys_getsid
 808         .long sys_fdatasync
 809         .long sys_sysctl
 810         .long sys_mlock         /* 150 */
 811         .long sys_munlock
 812         .long sys_mlockall
 813         .long sys_munlockall
 814         .long sys_sched_setparam
 815         .long sys_sched_getparam   /* 155 */
 816         .long sys_sched_setscheduler
 817         .long sys_sched_getscheduler
 818         .long sys_sched_yield
 819         .long sys_sched_get_priority_max
 820         .long sys_sched_get_priority_min  /* 160 */
 821         .long sys_sched_rr_get_interval
 822         .long sys_nanosleep
 823         .long sys_mremap
 824         .long sys_setresuid16
 825         .long sys_getresuid16   /* 165 */
 826         .long sys_vm86
 827         .long sys_ni_syscall    /* Old sys_query_module */
 828         .long sys_poll
 829         .long sys_nfsservctl
 830         .long sys_setresgid16   /* 170 */
 831         .long sys_getresgid16
 832         .long sys_prctl
 833         .long sys_rt_sigreturn
 834         .long sys_rt_sigaction
 835         .long sys_rt_sigprocmask        /* 175 */
 836         .long sys_rt_sigpending
 837         .long sys_rt_sigtimedwait
 838         .long sys_rt_sigqueueinfo
 839         .long sys_rt_sigsuspend
 840         .long sys_pread64       /* 180 */
 841         .long sys_pwrite64
 842         .long sys_chown16
 843         .long sys_getcwd
 844         .long sys_capget
 845         .long sys_capset        /* 185 */
 846         .long sys_sigaltstack
 847         .long sys_sendfile
 848         .long sys_ni_syscall    /* reserved for streams1 */
 849         .long sys_ni_syscall    /* reserved for streams2 */
 850         .long sys_vfork         /* 190 */
 851         .long sys_getrlimit
 852         .long sys_mmap2
 853         .long sys_truncate64
 854         .long sys_ftruncate64
 855         .long sys_stat64        /* 195 */
 856         .long sys_lstat64
 857         .long sys_fstat64
 858         .long sys_lchown
 859         .long sys_getuid
 860         .long sys_getgid        /* 200 */
 861         .long sys_geteuid
 862         .long sys_getegid
 863         .long sys_setreuid
 864         .long sys_setregid
 865         .long sys_getgroups     /* 205 */
 866         .long sys_setgroups
 867         .long sys_fchown
 868         .long sys_setresuid
 869         .long sys_getresuid
 870         .long sys_setresgid     /* 210 */
 871         .long sys_getresgid
 872         .long sys_chown
 873         .long sys_setuid
 874         .long sys_setgid
 875         .long sys_setfsuid      /* 215 */
 876         .long sys_setfsgid
 877         .long sys_pivot_root
 878         .long sys_mincore
 879         .long sys_madvise
 880         .long sys_getdents64    /* 220 */
 881         .long sys_fcntl64
 882         .long sys_ni_syscall    /* reserved for TUX */
 883         .long sys_ni_syscall
 884         .long sys_gettid
 885         .long sys_readahead     /* 225 */
 886         .long sys_setxattr
 887         .long sys_lsetxattr
 888         .long sys_fsetxattr
 889         .long sys_getxattr
 890         .long sys_lgetxattr     /* 230 */
 891         .long sys_fgetxattr
 892         .long sys_listxattr
 893         .long sys_llistxattr
 894         .long sys_flistxattr
 895         .long sys_removexattr   /* 235 */
 896         .long sys_lremovexattr
 897         .long sys_fremovexattr
 898         .long sys_tkill
 899         .long sys_sendfile64
 900         .long sys_futex         /* 240 */
 901         .long sys_sched_setaffinity
 902         .long sys_sched_getaffinity
 903         .long sys_set_thread_area
 904         .long sys_get_thread_area
 905         .long sys_io_setup      /* 245 */
 906         .long sys_io_destroy
 907         .long sys_io_getevents
 908         .long sys_io_submit
 909         .long sys_io_cancel
 910         .long sys_fadvise64     /* 250 */
 911         .long sys_ni_syscall
 912         .long sys_exit_group
 913         .long sys_lookup_dcookie
 914         .long sys_epoll_create
 915         .long sys_epoll_ctl     /* 255 */
 916         .long sys_epoll_wait
 917         .long sys_remap_file_pages
 918         .long sys_set_tid_address
 919         .long sys_timer_create
 920         .long sys_timer_settime         /* 260 */
 921         .long sys_timer_gettime
 922         .long sys_timer_getoverrun
 923         .long sys_timer_delete
 924         .long sys_clock_settime
 925         .long sys_clock_gettime         /* 265 */
 926         .long sys_clock_getres
 927         .long sys_clock_nanosleep
 928         .long sys_statfs64
 929         .long sys_fstatfs64
 930         .long sys_tgkill        /* 270 */
 931         .long sys_utimes
 932         .long sys_fadvise64_64
 933         .long sys_ni_syscall    /* sys_vserver */
 934         .long sys_mbind
 935         .long sys_get_mempolicy
 936         .long sys_set_mempolicy
 937         .long sys_mq_open
 938         .long sys_mq_unlink
 939         .long sys_mq_timedsend
 940         .long sys_mq_timedreceive       /* 280 */
 941         .long sys_mq_notify
 942         .long sys_mq_getsetattr
 943         .long sys_ni_syscall            /* reserved for kexec */
 944         .long sys_waitid
 945         .long sys_ni_syscall            /* 285 */ /* available */
 946         .long sys_add_key
 947         .long sys_request_key
 948         .long sys_keyctl
 949
 950 syscall_table_size=(.-sys_call_table)