arch/x86/ia32/ia32entry.S

   1 /*
   2  * Compatibility mode system call entry point for x86-64.
   3  *
   4  * Copyright 2000-2002 Andi Kleen, SuSE Labs.
   5  */
   6
   7 #include <asm/dwarf2.h>
   8 #include <asm/calling.h>
   9 #include <asm/asm-offsets.h>
  10 #include <asm/current.h>
  11 #include <asm/errno.h>
  12 #include <asm/ia32_unistd.h>
  13 #include <asm/thread_info.h>
  14 #include <asm/segment.h>
  15 #include <asm/irqflags.h>
  16 #include <linux/linkage.h>
  17
  18 /* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this.  */
  19 #include <linux/elf-em.h>
  20 #define AUDIT_ARCH_I386         (EM_386|__AUDIT_ARCH_LE)
  21 #define __AUDIT_ARCH_LE    0x40000000
  22
  23 #ifndef CONFIG_AUDITSYSCALL
  24 #define sysexit_audit int_ret_from_sys_call
  25 #define sysretl_audit int_ret_from_sys_call
  26 #endif
  27
  28 #define IA32_NR_syscalls ((ia32_syscall_end - ia32_sys_call_table)/8)
  29
  30         .macro IA32_ARG_FIXUP noebp=0
  31         movl    %edi,%r8d
  32         .if \noebp
  33         .else
  34         movl    %ebp,%r9d
  35         .endif
  36         xchg    %ecx,%esi
  37         movl    %ebx,%edi
  38         movl    %edx,%edx       /* zero extension */
  39         .endm
  40
  41         /* clobbers %eax */
  42         .macro  CLEAR_RREGS
  43         xorl    %eax,%eax
  44         movq    %rax,R11(%rsp)
  45         movq    %rax,R10(%rsp)
  46         movq    %rax,R9(%rsp)
  47         movq    %rax,R8(%rsp)
  48         .endm
  49
  50         /*
  51          * Reload arg registers from stack in case ptrace changed them.
  52          * We don't reload %eax because syscall_trace_enter() returned
  53          * the value it wants us to use in the table lookup.
  54          */
  55         .macro LOAD_ARGS32 offset
  56         movl \offset(%rsp),%r11d
  57         movl \offset+8(%rsp),%r10d
  58         movl \offset+16(%rsp),%r9d
  59         movl \offset+24(%rsp),%r8d
  60         movl \offset+40(%rsp),%ecx
  61         movl \offset+48(%rsp),%edx
  62         movl \offset+56(%rsp),%esi
  63         movl \offset+64(%rsp),%edi
  64         .endm
  65
  66         .macro CFI_STARTPROC32 simple
  67         CFI_STARTPROC   \simple
  68         CFI_UNDEFINED   r8
  69         CFI_UNDEFINED   r9
  70         CFI_UNDEFINED   r10
  71         CFI_UNDEFINED   r11
  72         CFI_UNDEFINED   r12
  73         CFI_UNDEFINED   r13
  74         CFI_UNDEFINED   r14
  75         CFI_UNDEFINED   r15
  76         .endm
  77
  78 #ifdef CONFIG_PARAVIRT
  79 ENTRY(native_usergs_sysret32)
  80         swapgs
  81         sysretl
  82 ENDPROC(native_usergs_sysret32)
  83
  84 ENTRY(native_irq_enable_sysexit)
  85         swapgs
  86         sti
  87         sysexit
  88 ENDPROC(native_irq_enable_sysexit)
  89 #endif
  90
  91 /*
  92  * 32bit SYSENTER instruction entry.
  93  *
  94  * Arguments:
  95  * %eax System call number.
  96  * %ebx Arg1
  97  * %ecx Arg2
  98  * %edx Arg3
  99  * %esi Arg4
 100  * %edi Arg5
 101  * %ebp user stack
 102  * 0(%ebp) Arg6
 103  *
 104  * Interrupts off.
 105  *
 106  * This is purely a fast path. For anything complicated we use the int 0x80
 107  * path below.  Set up a complete hardware stack frame to share code
 108  * with the int 0x80 path.
 109  */
 110 ENTRY(ia32_sysenter_target)
 111         CFI_STARTPROC32 simple
 112         CFI_SIGNAL_FRAME
 113         CFI_DEF_CFA     rsp,0
 114         CFI_REGISTER    rsp,rbp
 115         SWAPGS_UNSAFE_STACK
 116         movq    %gs:pda_kernelstack, %rsp
 117         addq    $(PDA_STACKOFFSET),%rsp
 118         /*
 119          * No need to follow this irqs on/off section: the syscall
 120          * disabled irqs, here we enable it straight after entry:
 121          */
 122         ENABLE_INTERRUPTS(CLBR_NONE)
 123         movl    %ebp,%ebp               /* zero extension */
 124         pushq   $__USER32_DS
 125         CFI_ADJUST_CFA_OFFSET 8
 126         /*CFI_REL_OFFSET ss,0*/
 127         pushq   %rbp
 128         CFI_ADJUST_CFA_OFFSET 8
 129         CFI_REL_OFFSET rsp,0
 130         pushfq
 131         CFI_ADJUST_CFA_OFFSET 8
 132         /*CFI_REL_OFFSET rflags,0*/
 133         movl    8*3-THREAD_SIZE+TI_sysenter_return(%rsp), %r10d
 134         CFI_REGISTER rip,r10
 135         pushq   $__USER32_CS
 136         CFI_ADJUST_CFA_OFFSET 8
 137         /*CFI_REL_OFFSET cs,0*/
 138         movl    %eax, %eax
 139         pushq   %r10
 140         CFI_ADJUST_CFA_OFFSET 8
 141         CFI_REL_OFFSET rip,0
 142         pushq   %rax
 143         CFI_ADJUST_CFA_OFFSET 8
 144         cld
 145         SAVE_ARGS 0,0,1
 146         /* no need to do an access_ok check here because rbp has been
 147            32bit zero extended */
 148 1:      movl    (%rbp),%r9d
 149         .section __ex_table,"a"
 150         .quad 1b,ia32_badarg
 151         .previous
 152         GET_THREAD_INFO(%r10)
 153         orl    $TS_COMPAT,TI_status(%r10)
 154         testl  $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%r10)
 155         CFI_REMEMBER_STATE
 156         jnz  sysenter_tracesys
 157         cmpl    $(IA32_NR_syscalls-1),%eax
 158         ja      ia32_badsys
 159 sysenter_do_call:
 160         IA32_ARG_FIXUP 1
 161 sysenter_dispatch:
 162         call    *ia32_sys_call_table(,%rax,8)
 163         movq    %rax,RAX-ARGOFFSET(%rsp)
 164         GET_THREAD_INFO(%r10)
 165         DISABLE_INTERRUPTS(CLBR_NONE)
 166         TRACE_IRQS_OFF
 167         testl   $_TIF_ALLWORK_MASK,TI_flags(%r10)
 168         jnz     sysexit_audit
 169 sysexit_from_sys_call:
 170         andl    $~TS_COMPAT,TI_status(%r10)
 171         /* clear IF, that popfq doesn't enable interrupts early */
 172         andl  $~0x200,EFLAGS-R11(%rsp)
 173         movl    RIP-R11(%rsp),%edx              /* User %eip */
 174         CFI_REGISTER rip,rdx
 175         RESTORE_ARGS 1,24,1,1,1,1
 176         popfq
 177         CFI_ADJUST_CFA_OFFSET -8
 178         /*CFI_RESTORE rflags*/
 179         popq    %rcx                            /* User %esp */
 180         CFI_ADJUST_CFA_OFFSET -8
 181         CFI_REGISTER rsp,rcx
 182         TRACE_IRQS_ON
 183         ENABLE_INTERRUPTS_SYSEXIT32
 184
 185 #ifdef CONFIG_AUDITSYSCALL
 186         .macro auditsys_entry_common
 187         movl %esi,%r9d                  /* 6th arg: 4th syscall arg */
 188         movl %edx,%r8d                  /* 5th arg: 3rd syscall arg */
 189         /* (already in %ecx)               4th arg: 2nd syscall arg */
 190         movl %ebx,%edx                  /* 3rd arg: 1st syscall arg */
 191         movl %eax,%esi                  /* 2nd arg: syscall number */
 192         movl $AUDIT_ARCH_I386,%edi      /* 1st arg: audit arch */
 193         call audit_syscall_entry
 194         movl RAX-ARGOFFSET(%rsp),%eax   /* reload syscall number */
 195         cmpl $(IA32_NR_syscalls-1),%eax
 196         ja ia32_badsys
 197         movl %ebx,%edi                  /* reload 1st syscall arg */
 198         movl RCX-ARGOFFSET(%rsp),%esi   /* reload 2nd syscall arg */
 199         movl RDX-ARGOFFSET(%rsp),%edx   /* reload 3rd syscall arg */
 200         movl RSI-ARGOFFSET(%rsp),%ecx   /* reload 4th syscall arg */
 201         movl RDI-ARGOFFSET(%rsp),%r8d   /* reload 5th syscall arg */
 202         .endm
 203
 204         .macro auditsys_exit exit,ebpsave=RBP
 205         testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),TI_flags(%r10)
 206         jnz int_ret_from_sys_call
 207         TRACE_IRQS_ON
 208         sti
 209         movl %eax,%esi          /* second arg, syscall return value */
 210         cmpl $0,%eax            /* is it < 0? */
 211         setl %al                /* 1 if so, 0 if not */
 212         movzbl %al,%edi         /* zero-extend that into %edi */
 213         inc %edi /* first arg, 0->1(AUDITSC_SUCCESS), 1->2(AUDITSC_FAILURE) */
 214         call audit_syscall_exit
 215         GET_THREAD_INFO(%r10)
 216         movl RAX-ARGOFFSET(%rsp),%eax   /* reload syscall return value */
 217         movl \ebpsave-ARGOFFSET(%rsp),%ebp /* reload user register value */
 218         movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi
 219         cli
 220         TRACE_IRQS_OFF
 221         testl %edi,TI_flags(%r10)
 222         jnz int_with_check
 223         jmp \exit
 224         .endm
 225
 226 sysenter_auditsys:
 227         CFI_RESTORE_STATE
 228         auditsys_entry_common
 229         movl %ebp,%r9d                  /* reload 6th syscall arg */
 230         jmp sysenter_dispatch
 231
 232 sysexit_audit:
 233         auditsys_exit sysexit_from_sys_call
 234 #endif
 235
 236 sysenter_tracesys:
 237         xchgl   %r9d,%ebp
 238 #ifdef CONFIG_AUDITSYSCALL
 239         testl   $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%r10)
 240         jz      sysenter_auditsys
 241 #endif
 242         SAVE_REST
 243         CLEAR_RREGS
 244         movq    %r9,R9(%rsp)
 245         movq    $-ENOSYS,RAX(%rsp)/* ptrace can change this for a bad syscall */
 246         movq    %rsp,%rdi        /* &pt_regs -> arg1 */
 247         call    syscall_trace_enter
 248         LOAD_ARGS32 ARGOFFSET  /* reload args from stack in case ptrace changed it */
 249         RESTORE_REST
 250         xchgl   %ebp,%r9d
 251         cmpl    $(IA32_NR_syscalls-1),%eax
 252         ja      int_ret_from_sys_call /* sysenter_tracesys has set RAX(%rsp) */
 253         jmp     sysenter_do_call
 254         CFI_ENDPROC
 255 ENDPROC(ia32_sysenter_target)
 256
 257 /*
 258  * 32bit SYSCALL instruction entry.
 259  *
 260  * Arguments:
 261  * %eax System call number.
 262  * %ebx Arg1
 263  * %ecx return EIP
 264  * %edx Arg3
 265  * %esi Arg4
 266  * %edi Arg5
 267  * %ebp Arg2    [note: not saved in the stack frame, should not be touched]
 268  * %esp user stack
 269  * 0(%esp) Arg6
 270  *
 271  * Interrupts off.
 272  *
 273  * This is purely a fast path. For anything complicated we use the int 0x80
 274  * path below.  Set up a complete hardware stack frame to share code
 275  * with the int 0x80 path.
 276  */
 277 ENTRY(ia32_cstar_target)
 278         CFI_STARTPROC32 simple
 279         CFI_SIGNAL_FRAME
 280         CFI_DEF_CFA     rsp,PDA_STACKOFFSET
 281         CFI_REGISTER    rip,rcx
 282         /*CFI_REGISTER  rflags,r11*/
 283         SWAPGS_UNSAFE_STACK
 284         movl    %esp,%r8d
 285         CFI_REGISTER    rsp,r8
 286         movq    %gs:pda_kernelstack,%rsp
 287         /*
 288          * No need to follow this irqs on/off section: the syscall
 289          * disabled irqs and here we enable it straight after entry:
 290          */
 291         ENABLE_INTERRUPTS(CLBR_NONE)
 292         SAVE_ARGS 8,1,1
 293         movl    %eax,%eax       /* zero extension */
 294         movq    %rax,ORIG_RAX-ARGOFFSET(%rsp)
 295         movq    %rcx,RIP-ARGOFFSET(%rsp)
 296         CFI_REL_OFFSET rip,RIP-ARGOFFSET
 297         movq    %rbp,RCX-ARGOFFSET(%rsp) /* this lies slightly to ptrace */
 298         movl    %ebp,%ecx
 299         movq    $__USER32_CS,CS-ARGOFFSET(%rsp)
 300         movq    $__USER32_DS,SS-ARGOFFSET(%rsp)
 301         movq    %r11,EFLAGS-ARGOFFSET(%rsp)
 302         /*CFI_REL_OFFSET rflags,EFLAGS-ARGOFFSET*/
 303         movq    %r8,RSP-ARGOFFSET(%rsp)
 304         CFI_REL_OFFSET rsp,RSP-ARGOFFSET
 305         /* no need to do an access_ok check here because r8 has been
 306            32bit zero extended */
 307         /* hardware stack frame is complete now */
 308 1:      movl    (%r8),%r9d
 309         .section __ex_table,"a"
 310         .quad 1b,ia32_badarg
 311         .previous
 312         GET_THREAD_INFO(%r10)
 313         orl   $TS_COMPAT,TI_status(%r10)
 314         testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%r10)
 315         CFI_REMEMBER_STATE
 316         jnz   cstar_tracesys
 317 cstar_do_call:
 318         cmpl $IA32_NR_syscalls-1,%eax
 319         ja  ia32_badsys
 320         IA32_ARG_FIXUP 1
 321 cstar_dispatch:
 322         call *ia32_sys_call_table(,%rax,8)
 323         movq %rax,RAX-ARGOFFSET(%rsp)
 324         GET_THREAD_INFO(%r10)
 325         DISABLE_INTERRUPTS(CLBR_NONE)
 326         TRACE_IRQS_OFF
 327         testl $_TIF_ALLWORK_MASK,TI_flags(%r10)
 328         jnz sysretl_audit
 329 sysretl_from_sys_call:
 330         andl $~TS_COMPAT,TI_status(%r10)
 331         RESTORE_ARGS 1,-ARG_SKIP,1,1,1
 332         movl RIP-ARGOFFSET(%rsp),%ecx
 333         CFI_REGISTER rip,rcx
 334         movl EFLAGS-ARGOFFSET(%rsp),%r11d
 335         /*CFI_REGISTER rflags,r11*/
 336         TRACE_IRQS_ON
 337         movl RSP-ARGOFFSET(%rsp),%esp
 338         CFI_RESTORE rsp
 339         USERGS_SYSRET32
 340
 341 #ifdef CONFIG_AUDITSYSCALL
 342 cstar_auditsys:
 343         CFI_RESTORE_STATE
 344         movl %r9d,R9-ARGOFFSET(%rsp)    /* register to be clobbered by call */
 345         auditsys_entry_common
 346         movl R9-ARGOFFSET(%rsp),%r9d    /* reload 6th syscall arg */
 347         jmp cstar_dispatch
 348
 349 sysretl_audit:
 350         auditsys_exit sysretl_from_sys_call, RCX /* user %ebp in RCX slot */
 351 #endif
 352
 353 cstar_tracesys:
 354 #ifdef CONFIG_AUDITSYSCALL
 355         testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%r10)
 356         jz cstar_auditsys
 357 #endif
 358         xchgl %r9d,%ebp
 359         SAVE_REST
 360         CLEAR_RREGS
 361         movq %r9,R9(%rsp)
 362         movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */
 363         movq %rsp,%rdi        /* &pt_regs -> arg1 */
 364         call syscall_trace_enter
 365         LOAD_ARGS32 ARGOFFSET  /* reload args from stack in case ptrace changed it */
 366         RESTORE_REST
 367         xchgl %ebp,%r9d
 368         movl RSP-ARGOFFSET(%rsp), %r8d
 369         cmpl $(IA32_NR_syscalls-1),%eax
 370         ja int_ret_from_sys_call /* cstar_tracesys has set RAX(%rsp) */
 371         jmp cstar_do_call
 372 END(ia32_cstar_target)
 373
 374 ia32_badarg:
 375         movq $-EFAULT,%rax
 376         jmp ia32_sysret
 377         CFI_ENDPROC
 378
 379 /*
 380  * Emulated IA32 system calls via int 0x80.
 381  *
 382  * Arguments:
 383  * %eax System call number.
 384  * %ebx Arg1
 385  * %ecx Arg2
 386  * %edx Arg3
 387  * %esi Arg4
 388  * %edi Arg5
 389  * %ebp Arg6    [note: not saved in the stack frame, should not be touched]
 390  *
 391  * Notes:
 392  * Uses the same stack frame as the x86-64 version.
 393  * All registers except %eax must be saved (but ptrace may violate that)
 394  * Arguments are zero extended. For system calls that want sign extension and
 395  * take long arguments a wrapper is needed. Most calls can just be called
 396  * directly.
 397  * Assumes it is only called from user space and entered with interrupts off.
 398  */
 399
 400 ENTRY(ia32_syscall)
 401         CFI_STARTPROC32 simple
 402         CFI_SIGNAL_FRAME
 403         CFI_DEF_CFA     rsp,SS+8-RIP
 404         /*CFI_REL_OFFSET        ss,SS-RIP*/
 405         CFI_REL_OFFSET  rsp,RSP-RIP
 406         /*CFI_REL_OFFSET        rflags,EFLAGS-RIP*/
 407         /*CFI_REL_OFFSET        cs,CS-RIP*/
 408         CFI_REL_OFFSET  rip,RIP-RIP
 409         PARAVIRT_ADJUST_EXCEPTION_FRAME
 410         SWAPGS
 411         /*
 412          * No need to follow this irqs on/off section: the syscall
 413          * disabled irqs and here we enable it straight after entry:
 414          */
 415         ENABLE_INTERRUPTS(CLBR_NONE)
 416         movl %eax,%eax
 417         pushq %rax
 418         CFI_ADJUST_CFA_OFFSET 8
 419         cld
 420         /* note the registers are not zero extended to the sf.
 421            this could be a problem. */
 422         SAVE_ARGS 0,0,1
 423         GET_THREAD_INFO(%r10)
 424         orl   $TS_COMPAT,TI_status(%r10)
 425         testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%r10)
 426         jnz ia32_tracesys
 427 ia32_do_syscall:
 428         cmpl $(IA32_NR_syscalls-1),%eax
 429         ja  int_ret_from_sys_call       /* ia32_tracesys has set RAX(%rsp) */
 430         IA32_ARG_FIXUP
 431         call *ia32_sys_call_table(,%rax,8) # xxx: rip relative
 432 ia32_sysret:
 433         movq %rax,RAX-ARGOFFSET(%rsp)
 434         jmp int_ret_from_sys_call
 435
 436 ia32_tracesys:
 437         SAVE_REST
 438         CLEAR_RREGS
 439         movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */
 440         movq %rsp,%rdi        /* &pt_regs -> arg1 */
 441         call syscall_trace_enter
 442         LOAD_ARGS32 ARGOFFSET  /* reload args from stack in case ptrace changed it */
 443         RESTORE_REST
 444         jmp ia32_do_syscall
 445 END(ia32_syscall)
 446
 447 ia32_badsys:
 448         movq $0,ORIG_RAX-ARGOFFSET(%rsp)
 449         movq $-ENOSYS,RAX-ARGOFFSET(%rsp)
 450         jmp int_ret_from_sys_call
 451
 452 quiet_ni_syscall:
 453         movq $-ENOSYS,%rax
 454         ret
 455         CFI_ENDPROC
 456
 457         .macro PTREGSCALL label, func, arg
 458         .globl \label
 459 \label:
 460         leaq \func(%rip),%rax
 461         leaq -ARGOFFSET+8(%rsp),\arg    /* 8 for return address */
 462         jmp  ia32_ptregs_common
 463         .endm
 464
 465         CFI_STARTPROC32
 466
 467         PTREGSCALL stub32_rt_sigreturn, sys32_rt_sigreturn, %rdi
 468         PTREGSCALL stub32_sigreturn, sys32_sigreturn, %rdi
 469         PTREGSCALL stub32_sigaltstack, sys32_sigaltstack, %rdx
 470         PTREGSCALL stub32_execve, sys32_execve, %rcx
 471         PTREGSCALL stub32_fork, sys_fork, %rdi
 472         PTREGSCALL stub32_clone, sys32_clone, %rdx
 473         PTREGSCALL stub32_vfork, sys_vfork, %rdi
 474         PTREGSCALL stub32_iopl, sys_iopl, %rsi
 475
 476 ENTRY(ia32_ptregs_common)
 477         popq %r11
 478         CFI_ENDPROC
 479         CFI_STARTPROC32 simple
 480         CFI_SIGNAL_FRAME
 481         CFI_DEF_CFA     rsp,SS+8-ARGOFFSET
 482         CFI_REL_OFFSET  rax,RAX-ARGOFFSET
 483         CFI_REL_OFFSET  rcx,RCX-ARGOFFSET
 484         CFI_REL_OFFSET  rdx,RDX-ARGOFFSET
 485         CFI_REL_OFFSET  rsi,RSI-ARGOFFSET
 486         CFI_REL_OFFSET  rdi,RDI-ARGOFFSET
 487         CFI_REL_OFFSET  rip,RIP-ARGOFFSET
 488 /*      CFI_REL_OFFSET  cs,CS-ARGOFFSET*/
 489 /*      CFI_REL_OFFSET  rflags,EFLAGS-ARGOFFSET*/
 490         CFI_REL_OFFSET  rsp,RSP-ARGOFFSET
 491 /*      CFI_REL_OFFSET  ss,SS-ARGOFFSET*/
 492         SAVE_REST
 493         call *%rax
 494         RESTORE_REST
 495         jmp  ia32_sysret        /* misbalances the return cache */
 496         CFI_ENDPROC
 497 END(ia32_ptregs_common)
 498
 499         .section .rodata,"a"
 500         .align 8
 501 ia32_sys_call_table:
 502         .quad sys_restart_syscall
 503         .quad sys_exit
 504         .quad stub32_fork
 505         .quad sys_read
 506         .quad sys_write
 507         .quad compat_sys_open           /* 5 */
 508         .quad sys_close
 509         .quad sys32_waitpid
 510         .quad sys_creat
 511         .quad sys_link
 512         .quad sys_unlink                /* 10 */
 513         .quad stub32_execve
 514         .quad sys_chdir
 515         .quad compat_sys_time
 516         .quad sys_mknod
 517         .quad sys_chmod         /* 15 */
 518         .quad sys_lchown16
 519         .quad quiet_ni_syscall                  /* old break syscall holder */
 520         .quad sys_stat
 521         .quad sys32_lseek
 522         .quad sys_getpid                /* 20 */
 523         .quad compat_sys_mount  /* mount  */
 524         .quad sys_oldumount     /* old_umount  */
 525         .quad sys_setuid16
 526         .quad sys_getuid16
 527         .quad compat_sys_stime  /* stime */             /* 25 */
 528         .quad compat_sys_ptrace /* ptrace */
 529         .quad sys_alarm
 530         .quad sys_fstat /* (old)fstat */
 531         .quad sys_pause
 532         .quad compat_sys_utime  /* 30 */
 533         .quad quiet_ni_syscall  /* old stty syscall holder */
 534         .quad quiet_ni_syscall  /* old gtty syscall holder */
 535         .quad sys_access
 536         .quad sys_nice
 537         .quad quiet_ni_syscall  /* 35 */        /* old ftime syscall holder */
 538         .quad sys_sync
 539         .quad sys32_kill
 540         .quad sys_rename
 541         .quad sys_mkdir
 542         .quad sys_rmdir         /* 40 */
 543         .quad sys_dup
 544         .quad sys32_pipe
 545         .quad compat_sys_times
 546         .quad quiet_ni_syscall                  /* old prof syscall holder */
 547         .quad sys_brk           /* 45 */
 548         .quad sys_setgid16
 549         .quad sys_getgid16
 550         .quad sys_signal
 551         .quad sys_geteuid16
 552         .quad sys_getegid16     /* 50 */
 553         .quad sys_acct
 554         .quad sys_umount                        /* new_umount */
 555         .quad quiet_ni_syscall                  /* old lock syscall holder */
 556         .quad compat_sys_ioctl
 557         .quad compat_sys_fcntl64                /* 55 */
 558         .quad quiet_ni_syscall                  /* old mpx syscall holder */
 559         .quad sys_setpgid
 560         .quad quiet_ni_syscall                  /* old ulimit syscall holder */
 561         .quad sys32_olduname
 562         .quad sys_umask         /* 60 */
 563         .quad sys_chroot
 564         .quad sys32_ustat
 565         .quad sys_dup2
 566         .quad sys_getppid
 567         .quad sys_getpgrp               /* 65 */
 568         .quad sys_setsid
 569         .quad sys32_sigaction
 570         .quad sys_sgetmask
 571         .quad sys_ssetmask
 572         .quad sys_setreuid16    /* 70 */
 573         .quad sys_setregid16
 574         .quad sys32_sigsuspend
 575         .quad compat_sys_sigpending
 576         .quad sys_sethostname
 577         .quad compat_sys_setrlimit      /* 75 */
 578         .quad compat_sys_old_getrlimit  /* old_getrlimit */
 579         .quad compat_sys_getrusage
 580         .quad sys32_gettimeofday
 581         .quad sys32_settimeofday
 582         .quad sys_getgroups16   /* 80 */
 583         .quad sys_setgroups16
 584         .quad sys32_old_select
 585         .quad sys_symlink
 586         .quad sys_lstat
 587         .quad sys_readlink              /* 85 */
 588         .quad sys_uselib
 589         .quad sys_swapon
 590         .quad sys_reboot
 591         .quad compat_sys_old_readdir
 592         .quad sys32_mmap                /* 90 */
 593         .quad sys_munmap
 594         .quad sys_truncate
 595         .quad sys_ftruncate
 596         .quad sys_fchmod
 597         .quad sys_fchown16              /* 95 */
 598         .quad sys_getpriority
 599         .quad sys_setpriority
 600         .quad quiet_ni_syscall                  /* old profil syscall holder */
 601         .quad compat_sys_statfs
 602         .quad compat_sys_fstatfs                /* 100 */
 603         .quad sys_ioperm
 604         .quad compat_sys_socketcall
 605         .quad sys_syslog
 606         .quad compat_sys_setitimer
 607         .quad compat_sys_getitimer      /* 105 */
 608         .quad compat_sys_newstat
 609         .quad compat_sys_newlstat
 610         .quad compat_sys_newfstat
 611         .quad sys32_uname
 612         .quad stub32_iopl               /* 110 */
 613         .quad sys_vhangup
 614         .quad quiet_ni_syscall  /* old "idle" system call */
 615         .quad sys32_vm86_warning        /* vm86old */
 616         .quad compat_sys_wait4
 617         .quad sys_swapoff               /* 115 */
 618         .quad compat_sys_sysinfo
 619         .quad sys32_ipc
 620         .quad sys_fsync
 621         .quad stub32_sigreturn
 622         .quad stub32_clone              /* 120 */
 623         .quad sys_setdomainname
 624         .quad sys_uname
 625         .quad sys_modify_ldt
 626         .quad compat_sys_adjtimex
 627         .quad sys32_mprotect            /* 125 */
 628         .quad compat_sys_sigprocmask
 629         .quad quiet_ni_syscall          /* create_module */
 630         .quad sys_init_module
 631         .quad sys_delete_module
 632         .quad quiet_ni_syscall          /* 130  get_kernel_syms */
 633         .quad sys32_quotactl
 634         .quad sys_getpgid
 635         .quad sys_fchdir
 636         .quad quiet_ni_syscall  /* bdflush */
 637         .quad sys_sysfs         /* 135 */
 638         .quad sys_personality
 639         .quad quiet_ni_syscall  /* for afs_syscall */
 640         .quad sys_setfsuid16
 641         .quad sys_setfsgid16
 642         .quad sys_llseek                /* 140 */
 643         .quad compat_sys_getdents
 644         .quad compat_sys_select
 645         .quad sys_flock
 646         .quad sys_msync
 647         .quad compat_sys_readv          /* 145 */
 648         .quad compat_sys_writev
 649         .quad sys_getsid
 650         .quad sys_fdatasync
 651         .quad sys32_sysctl      /* sysctl */
 652         .quad sys_mlock         /* 150 */
 653         .quad sys_munlock
 654         .quad sys_mlockall
 655         .quad sys_munlockall
 656         .quad sys_sched_setparam
 657         .quad sys_sched_getparam   /* 155 */
 658         .quad sys_sched_setscheduler
 659         .quad sys_sched_getscheduler
 660         .quad sys_sched_yield
 661         .quad sys_sched_get_priority_max
 662         .quad sys_sched_get_priority_min  /* 160 */
 663         .quad sys32_sched_rr_get_interval
 664         .quad compat_sys_nanosleep
 665         .quad sys_mremap
 666         .quad sys_setresuid16
 667         .quad sys_getresuid16   /* 165 */
 668         .quad sys32_vm86_warning        /* vm86 */
 669         .quad quiet_ni_syscall  /* query_module */
 670         .quad sys_poll
 671         .quad compat_sys_nfsservctl
 672         .quad sys_setresgid16   /* 170 */
 673         .quad sys_getresgid16
 674         .quad sys_prctl
 675         .quad stub32_rt_sigreturn
 676         .quad sys32_rt_sigaction
 677         .quad sys32_rt_sigprocmask      /* 175 */
 678         .quad sys32_rt_sigpending
 679         .quad compat_sys_rt_sigtimedwait
 680         .quad sys32_rt_sigqueueinfo
 681         .quad sys_rt_sigsuspend
 682         .quad sys32_pread               /* 180 */
 683         .quad sys32_pwrite
 684         .quad sys_chown16
 685         .quad sys_getcwd
 686         .quad sys_capget
 687         .quad sys_capset
 688         .quad stub32_sigaltstack
 689         .quad sys32_sendfile
 690         .quad quiet_ni_syscall          /* streams1 */
 691         .quad quiet_ni_syscall          /* streams2 */
 692         .quad stub32_vfork            /* 190 */
 693         .quad compat_sys_getrlimit
 694         .quad sys32_mmap2
 695         .quad sys32_truncate64
 696         .quad sys32_ftruncate64
 697         .quad sys32_stat64              /* 195 */
 698         .quad sys32_lstat64
 699         .quad sys32_fstat64
 700         .quad sys_lchown
 701         .quad sys_getuid
 702         .quad sys_getgid                /* 200 */
 703         .quad sys_geteuid
 704         .quad sys_getegid
 705         .quad sys_setreuid
 706         .quad sys_setregid
 707         .quad sys_getgroups     /* 205 */
 708         .quad sys_setgroups
 709         .quad sys_fchown
 710         .quad sys_setresuid
 711         .quad sys_getresuid
 712         .quad sys_setresgid     /* 210 */
 713         .quad sys_getresgid
 714         .quad sys_chown
 715         .quad sys_setuid
 716         .quad sys_setgid
 717         .quad sys_setfsuid              /* 215 */
 718         .quad sys_setfsgid
 719         .quad sys_pivot_root
 720         .quad sys_mincore
 721         .quad sys_madvise
 722         .quad compat_sys_getdents64     /* 220 getdents64 */
 723         .quad compat_sys_fcntl64
 724         .quad quiet_ni_syscall          /* tux */
 725         .quad quiet_ni_syscall          /* security */
 726         .quad sys_gettid
 727         .quad sys32_readahead   /* 225 */
 728         .quad sys_setxattr
 729         .quad sys_lsetxattr
 730         .quad sys_fsetxattr
 731         .quad sys_getxattr
 732         .quad sys_lgetxattr     /* 230 */
 733         .quad sys_fgetxattr
 734         .quad sys_listxattr
 735         .quad sys_llistxattr
 736         .quad sys_flistxattr
 737         .quad sys_removexattr   /* 235 */
 738         .quad sys_lremovexattr
 739         .quad sys_fremovexattr
 740         .quad sys_tkill
 741         .quad sys_sendfile64
 742         .quad compat_sys_futex          /* 240 */
 743         .quad compat_sys_sched_setaffinity
 744         .quad compat_sys_sched_getaffinity
 745         .quad sys_set_thread_area
 746         .quad sys_get_thread_area
 747         .quad compat_sys_io_setup       /* 245 */
 748         .quad sys_io_destroy
 749         .quad compat_sys_io_getevents
 750         .quad compat_sys_io_submit
 751         .quad sys_io_cancel
 752         .quad sys32_fadvise64           /* 250 */
 753         .quad quiet_ni_syscall  /* free_huge_pages */
 754         .quad sys_exit_group
 755         .quad sys32_lookup_dcookie
 756         .quad sys_epoll_create
 757         .quad sys_epoll_ctl             /* 255 */
 758         .quad sys_epoll_wait
 759         .quad sys_remap_file_pages
 760         .quad sys_set_tid_address
 761         .quad compat_sys_timer_create
 762         .quad compat_sys_timer_settime  /* 260 */
 763         .quad compat_sys_timer_gettime
 764         .quad sys_timer_getoverrun
 765         .quad sys_timer_delete
 766         .quad compat_sys_clock_settime
 767         .quad compat_sys_clock_gettime  /* 265 */
 768         .quad compat_sys_clock_getres
 769         .quad compat_sys_clock_nanosleep
 770         .quad compat_sys_statfs64
 771         .quad compat_sys_fstatfs64
 772         .quad sys_tgkill                /* 270 */
 773         .quad compat_sys_utimes
 774         .quad sys32_fadvise64_64
 775         .quad quiet_ni_syscall  /* sys_vserver */
 776         .quad sys_mbind
 777         .quad compat_sys_get_mempolicy  /* 275 */
 778         .quad sys_set_mempolicy
 779         .quad compat_sys_mq_open
 780         .quad sys_mq_unlink
 781         .quad compat_sys_mq_timedsend
 782         .quad compat_sys_mq_timedreceive        /* 280 */
 783         .quad compat_sys_mq_notify
 784         .quad compat_sys_mq_getsetattr
 785         .quad compat_sys_kexec_load     /* reserved for kexec */
 786         .quad compat_sys_waitid
 787         .quad quiet_ni_syscall          /* 285: sys_altroot */
 788         .quad sys_add_key
 789         .quad sys_request_key
 790         .quad sys_keyctl
 791         .quad sys_ioprio_set
 792         .quad sys_ioprio_get            /* 290 */
 793         .quad sys_inotify_init
 794         .quad sys_inotify_add_watch
 795         .quad sys_inotify_rm_watch
 796         .quad sys_migrate_pages
 797         .quad compat_sys_openat         /* 295 */
 798         .quad sys_mkdirat
 799         .quad sys_mknodat
 800         .quad sys_fchownat
 801         .quad compat_sys_futimesat
 802         .quad sys32_fstatat             /* 300 */
 803         .quad sys_unlinkat
 804         .quad sys_renameat
 805         .quad sys_linkat
 806         .quad sys_symlinkat
 807         .quad sys_readlinkat            /* 305 */
 808         .quad sys_fchmodat
 809         .quad sys_faccessat
 810         .quad compat_sys_pselect6
 811         .quad compat_sys_ppoll
 812         .quad sys_unshare               /* 310 */
 813         .quad compat_sys_set_robust_list
 814         .quad compat_sys_get_robust_list
 815         .quad sys_splice
 816         .quad sys32_sync_file_range
 817         .quad sys_tee                   /* 315 */
 818         .quad compat_sys_vmsplice
 819         .quad compat_sys_move_pages
 820         .quad sys_getcpu
 821         .quad sys_epoll_pwait
 822         .quad compat_sys_utimensat      /* 320 */
 823         .quad compat_sys_signalfd
 824         .quad sys_timerfd_create
 825         .quad sys_eventfd
 826         .quad sys32_fallocate
 827         .quad compat_sys_timerfd_settime        /* 325 */
 828         .quad compat_sys_timerfd_gettime
 829         .quad compat_sys_signalfd4
 830         .quad sys_eventfd2
 831         .quad sys_epoll_create1
 832         .quad sys_dup3                  /* 330 */
 833         .quad sys_pipe2
 834         .quad sys_inotify_init1
 835 ia32_syscall_end: