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 ia32_ret_from_sys_call
  25 #define sysretl_audit ia32_ret_from_sys_call
  26 #endif
  27
  28         .section .entry.text, "ax"
  29
  30 #define IA32_NR_syscalls ((ia32_syscall_end - ia32_sys_call_table)/8)
  31
  32         .macro IA32_ARG_FIXUP noebp=0
  33         movl    %edi,%r8d
  34         .if \noebp
  35         .else
  36         movl    %ebp,%r9d
  37         .endif
  38         xchg    %ecx,%esi
  39         movl    %ebx,%edi
  40         movl    %edx,%edx       /* zero extension */
  41         .endm
  42
  43         /* clobbers %eax */
  44         .macro  CLEAR_RREGS offset=0, _r9=rax
  45         xorl    %eax,%eax
  46         movq    %rax,\offset+R11(%rsp)
  47         movq    %rax,\offset+R10(%rsp)
  48         movq    %\_r9,\offset+R9(%rsp)
  49         movq    %rax,\offset+R8(%rsp)
  50         .endm
  51
  52         /*
  53          * Reload arg registers from stack in case ptrace changed them.
  54          * We don't reload %eax because syscall_trace_enter() returned
  55          * the %rax value we should see.  Instead, we just truncate that
  56          * value to 32 bits again as we did on entry from user mode.
  57          * If it's a new value set by user_regset during entry tracing,
  58          * this matches the normal truncation of the user-mode value.
  59          * If it's -1 to make us punt the syscall, then (u32)-1 is still
  60          * an appropriately invalid value.
  61          */
  62         .macro LOAD_ARGS32 offset, _r9=0
  63         .if \_r9
  64         movl \offset+16(%rsp),%r9d
  65         .endif
  66         movl \offset+40(%rsp),%ecx
  67         movl \offset+48(%rsp),%edx
  68         movl \offset+56(%rsp),%esi
  69         movl \offset+64(%rsp),%edi
  70         movl %eax,%eax                  /* zero extension */
  71         .endm
  72
  73         .macro CFI_STARTPROC32 simple
  74         CFI_STARTPROC   \simple
  75         CFI_UNDEFINED   r8
  76         CFI_UNDEFINED   r9
  77         CFI_UNDEFINED   r10
  78         CFI_UNDEFINED   r11
  79         CFI_UNDEFINED   r12
  80         CFI_UNDEFINED   r13
  81         CFI_UNDEFINED   r14
  82         CFI_UNDEFINED   r15
  83         .endm
  84
  85 #ifdef CONFIG_PARAVIRT
  86 ENTRY(native_usergs_sysret32)
  87         swapgs
  88         sysretl
  89 ENDPROC(native_usergs_sysret32)
  90
  91 ENTRY(native_irq_enable_sysexit)
  92         swapgs
  93         sti
  94         sysexit
  95 ENDPROC(native_irq_enable_sysexit)
  96 #endif
  97
  98 /*
  99  * 32bit SYSENTER instruction entry.
 100  *
 101  * Arguments:
 102  * %eax System call number.
 103  * %ebx Arg1
 104  * %ecx Arg2
 105  * %edx Arg3
 106  * %esi Arg4
 107  * %edi Arg5
 108  * %ebp user stack
 109  * 0(%ebp) Arg6
 110  *
 111  * Interrupts off.
 112  *
 113  * This is purely a fast path. For anything complicated we use the int 0x80
 114  * path below.  Set up a complete hardware stack frame to share code
 115  * with the int 0x80 path.
 116  */
 117 ENTRY(ia32_sysenter_target)
 118         CFI_STARTPROC32 simple
 119         CFI_SIGNAL_FRAME
 120         CFI_DEF_CFA     rsp,0
 121         CFI_REGISTER    rsp,rbp
 122         SWAPGS_UNSAFE_STACK
 123         movq    PER_CPU_VAR(kernel_stack), %rsp
 124         addq    $(KERNEL_STACK_OFFSET),%rsp
 125         /*
 126          * No need to follow this irqs on/off section: the syscall
 127          * disabled irqs, here we enable it straight after entry:
 128          */
 129         ENABLE_INTERRUPTS(CLBR_NONE)
 130         movl    %ebp,%ebp               /* zero extension */
 131         pushq_cfi $__USER32_DS
 132         /*CFI_REL_OFFSET ss,0*/
 133         pushq_cfi %rbp
 134         CFI_REL_OFFSET rsp,0
 135         pushfq_cfi
 136         /*CFI_REL_OFFSET rflags,0*/
 137         movl    8*3-THREAD_SIZE+TI_sysenter_return(%rsp), %r10d
 138         CFI_REGISTER rip,r10
 139         pushq_cfi $__USER32_CS
 140         /*CFI_REL_OFFSET cs,0*/
 141         movl    %eax, %eax
 142         pushq_cfi %r10
 143         CFI_REL_OFFSET rip,0
 144         pushq_cfi %rax
 145         cld
 146         SAVE_ARGS 0,0,1
 147         /* no need to do an access_ok check here because rbp has been
 148            32bit zero extended */
 149 1:      movl    (%rbp),%ebp
 150         .section __ex_table,"a"
 151         .quad 1b,ia32_badarg
 152         .previous
 153         GET_THREAD_INFO(%r10)
 154         orl    $TS_COMPAT,TI_status(%r10)
 155         testl  $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%r10)
 156         CFI_REMEMBER_STATE
 157         jnz  sysenter_tracesys
 158         cmpq    $(IA32_NR_syscalls-1),%rax
 159         ja      ia32_badsys
 160 sysenter_do_call:
 161         IA32_ARG_FIXUP
 162 sysenter_dispatch:
 163         call    *ia32_sys_call_table(,%rax,8)
 164         movq    %rax,RAX-ARGOFFSET(%rsp)
 165         GET_THREAD_INFO(%r10)
 166         DISABLE_INTERRUPTS(CLBR_NONE)
 167         TRACE_IRQS_OFF
 168         testl   $_TIF_ALLWORK_MASK,TI_flags(%r10)
 169         jnz     sysexit_audit
 170 sysexit_from_sys_call:
 171         andl    $~TS_COMPAT,TI_status(%r10)
 172         /* clear IF, that popfq doesn't enable interrupts early */
 173         andl  $~0x200,EFLAGS-R11(%rsp)
 174         movl    RIP-R11(%rsp),%edx              /* User %eip */
 175         CFI_REGISTER rip,rdx
 176         RESTORE_ARGS 1,24,1,1,1,1
 177         xorq    %r8,%r8
 178         xorq    %r9,%r9
 179         xorq    %r10,%r10
 180         xorq    %r11,%r11
 181         popfq_cfi
 182         /*CFI_RESTORE rflags*/
 183         popq_cfi %rcx                           /* User %esp */
 184         CFI_REGISTER rsp,rcx
 185         TRACE_IRQS_ON
 186         ENABLE_INTERRUPTS_SYSEXIT32
 187
 188 #ifdef CONFIG_AUDITSYSCALL
 189         .macro auditsys_entry_common
 190         movl %esi,%r9d                  /* 6th arg: 4th syscall arg */
 191         movl %edx,%r8d                  /* 5th arg: 3rd syscall arg */
 192         /* (already in %ecx)               4th arg: 2nd syscall arg */
 193         movl %ebx,%edx                  /* 3rd arg: 1st syscall arg */
 194         movl %eax,%esi                  /* 2nd arg: syscall number */
 195         movl $AUDIT_ARCH_I386,%edi      /* 1st arg: audit arch */
 196         call audit_syscall_entry
 197         movl RAX-ARGOFFSET(%rsp),%eax   /* reload syscall number */
 198         cmpq $(IA32_NR_syscalls-1),%rax
 199         ja ia32_badsys
 200         movl %ebx,%edi                  /* reload 1st syscall arg */
 201         movl RCX-ARGOFFSET(%rsp),%esi   /* reload 2nd syscall arg */
 202         movl RDX-ARGOFFSET(%rsp),%edx   /* reload 3rd syscall arg */
 203         movl RSI-ARGOFFSET(%rsp),%ecx   /* reload 4th syscall arg */
 204         movl RDI-ARGOFFSET(%rsp),%r8d   /* reload 5th syscall arg */
 205         .endm
 206
 207         .macro auditsys_exit exit
 208         testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),TI_flags(%r10)
 209         jnz ia32_ret_from_sys_call
 210         TRACE_IRQS_ON
 211         sti
 212         movl %eax,%esi          /* second arg, syscall return value */
 213         cmpl $0,%eax            /* is it < 0? */
 214         setl %al                /* 1 if so, 0 if not */
 215         movzbl %al,%edi         /* zero-extend that into %edi */
 216         inc %edi /* first arg, 0->1(AUDITSC_SUCCESS), 1->2(AUDITSC_FAILURE) */
 217         call audit_syscall_exit
 218         GET_THREAD_INFO(%r10)
 219         movl RAX-ARGOFFSET(%rsp),%eax   /* reload syscall return value */
 220         movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi
 221         cli
 222         TRACE_IRQS_OFF
 223         testl %edi,TI_flags(%r10)
 224         jz \exit
 225         CLEAR_RREGS -ARGOFFSET
 226         jmp int_with_check
 227         .endm
 228
 229 sysenter_auditsys:
 230         CFI_RESTORE_STATE
 231         auditsys_entry_common
 232         movl %ebp,%r9d                  /* reload 6th syscall arg */
 233         jmp sysenter_dispatch
 234
 235 sysexit_audit:
 236         auditsys_exit sysexit_from_sys_call
 237 #endif
 238
 239 sysenter_tracesys:
 240 #ifdef CONFIG_AUDITSYSCALL
 241         testl   $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%r10)
 242         jz      sysenter_auditsys
 243 #endif
 244         SAVE_REST
 245         CLEAR_RREGS
 246         movq    $-ENOSYS,RAX(%rsp)/* ptrace can change this for a bad syscall */
 247         movq    %rsp,%rdi        /* &pt_regs -> arg1 */
 248         call    syscall_trace_enter
 249         LOAD_ARGS32 ARGOFFSET  /* reload args from stack in case ptrace changed it */
 250         RESTORE_REST
 251         cmpq    $(IA32_NR_syscalls-1),%rax
 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,KERNEL_STACK_OFFSET
 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    PER_CPU_VAR(kernel_stack),%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         cmpq $IA32_NR_syscalls-1,%rax
 318         ja  ia32_badsys
 319 cstar_do_call:
 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         xorq    %r10,%r10
 337         xorq    %r9,%r9
 338         xorq    %r8,%r8
 339         TRACE_IRQS_ON
 340         movl RSP-ARGOFFSET(%rsp),%esp
 341         CFI_RESTORE rsp
 342         USERGS_SYSRET32
 343
 344 #ifdef CONFIG_AUDITSYSCALL
 345 cstar_auditsys:
 346         CFI_RESTORE_STATE
 347         movl %r9d,R9-ARGOFFSET(%rsp)    /* register to be clobbered by call */
 348         auditsys_entry_common
 349         movl R9-ARGOFFSET(%rsp),%r9d    /* reload 6th syscall arg */
 350         jmp cstar_dispatch
 351
 352 sysretl_audit:
 353         auditsys_exit sysretl_from_sys_call
 354 #endif
 355
 356 cstar_tracesys:
 357 #ifdef CONFIG_AUDITSYSCALL
 358         testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%r10)
 359         jz cstar_auditsys
 360 #endif
 361         xchgl %r9d,%ebp
 362         SAVE_REST
 363         CLEAR_RREGS 0, r9
 364         movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */
 365         movq %rsp,%rdi        /* &pt_regs -> arg1 */
 366         call syscall_trace_enter
 367         LOAD_ARGS32 ARGOFFSET, 1  /* reload args from stack in case ptrace changed it */
 368         RESTORE_REST
 369         xchgl %ebp,%r9d
 370         cmpq $(IA32_NR_syscalls-1),%rax
 371         ja int_ret_from_sys_call /* cstar_tracesys has set RAX(%rsp) */
 372         jmp cstar_do_call
 373 END(ia32_cstar_target)
 374
 375 ia32_badarg:
 376         movq $-EFAULT,%rax
 377         jmp ia32_sysret
 378         CFI_ENDPROC
 379
 380 /*
 381  * Emulated IA32 system calls via int 0x80.
 382  *
 383  * Arguments:
 384  * %eax System call number.
 385  * %ebx Arg1
 386  * %ecx Arg2
 387  * %edx Arg3
 388  * %esi Arg4
 389  * %edi Arg5
 390  * %ebp Arg6    [note: not saved in the stack frame, should not be touched]
 391  *
 392  * Notes:
 393  * Uses the same stack frame as the x86-64 version.
 394  * All registers except %eax must be saved (but ptrace may violate that)
 395  * Arguments are zero extended. For system calls that want sign extension and
 396  * take long arguments a wrapper is needed. Most calls can just be called
 397  * directly.
 398  * Assumes it is only called from user space and entered with interrupts off.
 399  */
 400
 401 ENTRY(ia32_syscall)
 402         CFI_STARTPROC32 simple
 403         CFI_SIGNAL_FRAME
 404         CFI_DEF_CFA     rsp,SS+8-RIP
 405         /*CFI_REL_OFFSET        ss,SS-RIP*/
 406         CFI_REL_OFFSET  rsp,RSP-RIP
 407         /*CFI_REL_OFFSET        rflags,EFLAGS-RIP*/
 408         /*CFI_REL_OFFSET        cs,CS-RIP*/
 409         CFI_REL_OFFSET  rip,RIP-RIP
 410         PARAVIRT_ADJUST_EXCEPTION_FRAME
 411         SWAPGS
 412         /*
 413          * No need to follow this irqs on/off section: the syscall
 414          * disabled irqs and here we enable it straight after entry:
 415          */
 416         ENABLE_INTERRUPTS(CLBR_NONE)
 417         movl %eax,%eax
 418         pushq_cfi %rax
 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         cmpq $(IA32_NR_syscalls-1),%rax
 428         ja ia32_badsys
 429 ia32_do_call:
 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 ia32_ret_from_sys_call:
 435         CLEAR_RREGS -ARGOFFSET
 436         jmp int_ret_from_sys_call
 437
 438 ia32_tracesys:
 439         SAVE_REST
 440         CLEAR_RREGS
 441         movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */
 442         movq %rsp,%rdi        /* &pt_regs -> arg1 */
 443         call syscall_trace_enter
 444         LOAD_ARGS32 ARGOFFSET  /* reload args from stack in case ptrace changed it */
 445         RESTORE_REST
 446         cmpq $(IA32_NR_syscalls-1),%rax
 447         ja  int_ret_from_sys_call       /* ia32_tracesys has set RAX(%rsp) */
 448         jmp ia32_do_call
 449 END(ia32_syscall)
 450
 451 ia32_badsys:
 452         movq $0,ORIG_RAX-ARGOFFSET(%rsp)
 453         movq $-ENOSYS,%rax
 454         jmp ia32_sysret
 455
 456 quiet_ni_syscall:
 457         movq $-ENOSYS,%rax
 458         ret
 459         CFI_ENDPROC
 460
 461         .macro PTREGSCALL label, func, arg
 462         .globl \label
 463 \label:
 464         leaq \func(%rip),%rax
 465         leaq -ARGOFFSET+8(%rsp),\arg    /* 8 for return address */
 466         jmp  ia32_ptregs_common
 467         .endm
 468
 469         CFI_STARTPROC32
 470
 471         PTREGSCALL stub32_rt_sigreturn, sys32_rt_sigreturn, %rdi
 472         PTREGSCALL stub32_sigreturn, sys32_sigreturn, %rdi
 473         PTREGSCALL stub32_sigaltstack, sys32_sigaltstack, %rdx
 474         PTREGSCALL stub32_execve, sys32_execve, %rcx
 475         PTREGSCALL stub32_fork, sys_fork, %rdi
 476         PTREGSCALL stub32_clone, sys32_clone, %rdx
 477         PTREGSCALL stub32_vfork, sys_vfork, %rdi
 478         PTREGSCALL stub32_iopl, sys_iopl, %rsi
 479
 480 ENTRY(ia32_ptregs_common)
 481         popq %r11
 482         CFI_ENDPROC
 483         CFI_STARTPROC32 simple
 484         CFI_SIGNAL_FRAME
 485         CFI_DEF_CFA     rsp,SS+8-ARGOFFSET
 486         CFI_REL_OFFSET  rax,RAX-ARGOFFSET
 487         CFI_REL_OFFSET  rcx,RCX-ARGOFFSET
 488         CFI_REL_OFFSET  rdx,RDX-ARGOFFSET
 489         CFI_REL_OFFSET  rsi,RSI-ARGOFFSET
 490         CFI_REL_OFFSET  rdi,RDI-ARGOFFSET
 491         CFI_REL_OFFSET  rip,RIP-ARGOFFSET
 492 /*      CFI_REL_OFFSET  cs,CS-ARGOFFSET*/
 493 /*      CFI_REL_OFFSET  rflags,EFLAGS-ARGOFFSET*/
 494         CFI_REL_OFFSET  rsp,RSP-ARGOFFSET
 495 /*      CFI_REL_OFFSET  ss,SS-ARGOFFSET*/
 496         SAVE_REST
 497         call *%rax
 498         RESTORE_REST
 499         jmp  ia32_sysret        /* misbalances the return cache */
 500         CFI_ENDPROC
 501 END(ia32_ptregs_common)
 502
 503         .section .rodata,"a"
 504         .align 8
 505 ia32_sys_call_table:
 506         .quad sys_restart_syscall
 507         .quad sys_exit
 508         .quad stub32_fork
 509         .quad sys_read
 510         .quad sys_write
 511         .quad compat_sys_open           /* 5 */
 512         .quad sys_close
 513         .quad sys32_waitpid
 514         .quad sys_creat
 515         .quad sys_link
 516         .quad sys_unlink                /* 10 */
 517         .quad stub32_execve
 518         .quad sys_chdir
 519         .quad compat_sys_time
 520         .quad sys_mknod
 521         .quad sys_chmod         /* 15 */
 522         .quad sys_lchown16
 523         .quad quiet_ni_syscall                  /* old break syscall holder */
 524         .quad sys_stat
 525         .quad sys32_lseek
 526         .quad sys_getpid                /* 20 */
 527         .quad compat_sys_mount  /* mount  */
 528         .quad sys_oldumount     /* old_umount  */
 529         .quad sys_setuid16
 530         .quad sys_getuid16
 531         .quad compat_sys_stime  /* stime */             /* 25 */
 532         .quad compat_sys_ptrace /* ptrace */
 533         .quad sys_alarm
 534         .quad sys_fstat /* (old)fstat */
 535         .quad sys_pause
 536         .quad compat_sys_utime  /* 30 */
 537         .quad quiet_ni_syscall  /* old stty syscall holder */
 538         .quad quiet_ni_syscall  /* old gtty syscall holder */
 539         .quad sys_access
 540         .quad sys_nice
 541         .quad quiet_ni_syscall  /* 35 */        /* old ftime syscall holder */
 542         .quad sys_sync
 543         .quad sys32_kill
 544         .quad sys_rename
 545         .quad sys_mkdir
 546         .quad sys_rmdir         /* 40 */
 547         .quad sys_dup
 548         .quad sys_pipe
 549         .quad compat_sys_times
 550         .quad quiet_ni_syscall                  /* old prof syscall holder */
 551         .quad sys_brk           /* 45 */
 552         .quad sys_setgid16
 553         .quad sys_getgid16
 554         .quad sys_signal
 555         .quad sys_geteuid16
 556         .quad sys_getegid16     /* 50 */
 557         .quad sys_acct
 558         .quad sys_umount                        /* new_umount */
 559         .quad quiet_ni_syscall                  /* old lock syscall holder */
 560         .quad compat_sys_ioctl
 561         .quad compat_sys_fcntl64                /* 55 */
 562         .quad quiet_ni_syscall                  /* old mpx syscall holder */
 563         .quad sys_setpgid
 564         .quad quiet_ni_syscall                  /* old ulimit syscall holder */
 565         .quad sys_olduname
 566         .quad sys_umask         /* 60 */
 567         .quad sys_chroot
 568         .quad compat_sys_ustat
 569         .quad sys_dup2
 570         .quad sys_getppid
 571         .quad sys_getpgrp               /* 65 */
 572         .quad sys_setsid
 573         .quad sys32_sigaction
 574         .quad sys_sgetmask
 575         .quad sys_ssetmask
 576         .quad sys_setreuid16    /* 70 */
 577         .quad sys_setregid16
 578         .quad sys32_sigsuspend
 579         .quad compat_sys_sigpending
 580         .quad sys_sethostname
 581         .quad compat_sys_setrlimit      /* 75 */
 582         .quad compat_sys_old_getrlimit  /* old_getrlimit */
 583         .quad compat_sys_getrusage
 584         .quad compat_sys_gettimeofday
 585         .quad compat_sys_settimeofday
 586         .quad sys_getgroups16   /* 80 */
 587         .quad sys_setgroups16
 588         .quad compat_sys_old_select
 589         .quad sys_symlink
 590         .quad sys_lstat
 591         .quad sys_readlink              /* 85 */
 592         .quad sys_uselib
 593         .quad sys_swapon
 594         .quad sys_reboot
 595         .quad compat_sys_old_readdir
 596         .quad sys32_mmap                /* 90 */
 597         .quad sys_munmap
 598         .quad sys_truncate
 599         .quad sys_ftruncate
 600         .quad sys_fchmod
 601         .quad sys_fchown16              /* 95 */
 602         .quad sys_getpriority
 603         .quad sys_setpriority
 604         .quad quiet_ni_syscall                  /* old profil syscall holder */
 605         .quad compat_sys_statfs
 606         .quad compat_sys_fstatfs                /* 100 */
 607         .quad sys_ioperm
 608         .quad compat_sys_socketcall
 609         .quad sys_syslog
 610         .quad compat_sys_setitimer
 611         .quad compat_sys_getitimer      /* 105 */
 612         .quad compat_sys_newstat
 613         .quad compat_sys_newlstat
 614         .quad compat_sys_newfstat
 615         .quad sys_uname
 616         .quad stub32_iopl               /* 110 */
 617         .quad sys_vhangup
 618         .quad quiet_ni_syscall  /* old "idle" system call */
 619         .quad sys32_vm86_warning        /* vm86old */
 620         .quad compat_sys_wait4
 621         .quad sys_swapoff               /* 115 */
 622         .quad compat_sys_sysinfo
 623         .quad sys32_ipc
 624         .quad sys_fsync
 625         .quad stub32_sigreturn
 626         .quad stub32_clone              /* 120 */
 627         .quad sys_setdomainname
 628         .quad sys_newuname
 629         .quad sys_modify_ldt
 630         .quad compat_sys_adjtimex
 631         .quad sys32_mprotect            /* 125 */
 632         .quad compat_sys_sigprocmask
 633         .quad quiet_ni_syscall          /* create_module */
 634         .quad sys_init_module
 635         .quad sys_delete_module
 636         .quad quiet_ni_syscall          /* 130  get_kernel_syms */
 637         .quad sys32_quotactl
 638         .quad sys_getpgid
 639         .quad sys_fchdir
 640         .quad quiet_ni_syscall  /* bdflush */
 641         .quad sys_sysfs         /* 135 */
 642         .quad sys_personality
 643         .quad quiet_ni_syscall  /* for afs_syscall */
 644         .quad sys_setfsuid16
 645         .quad sys_setfsgid16
 646         .quad sys_llseek                /* 140 */
 647         .quad compat_sys_getdents
 648         .quad compat_sys_select
 649         .quad sys_flock
 650         .quad sys_msync
 651         .quad compat_sys_readv          /* 145 */
 652         .quad compat_sys_writev
 653         .quad sys_getsid
 654         .quad sys_fdatasync
 655         .quad compat_sys_sysctl /* sysctl */
 656         .quad sys_mlock         /* 150 */
 657         .quad sys_munlock
 658         .quad sys_mlockall
 659         .quad sys_munlockall
 660         .quad sys_sched_setparam
 661         .quad sys_sched_getparam   /* 155 */
 662         .quad sys_sched_setscheduler
 663         .quad sys_sched_getscheduler
 664         .quad sys_sched_yield
 665         .quad sys_sched_get_priority_max
 666         .quad sys_sched_get_priority_min  /* 160 */
 667         .quad sys32_sched_rr_get_interval
 668         .quad compat_sys_nanosleep
 669         .quad sys_mremap
 670         .quad sys_setresuid16
 671         .quad sys_getresuid16   /* 165 */
 672         .quad sys32_vm86_warning        /* vm86 */
 673         .quad quiet_ni_syscall  /* query_module */
 674         .quad sys_poll
 675         .quad compat_sys_nfsservctl
 676         .quad sys_setresgid16   /* 170 */
 677         .quad sys_getresgid16
 678         .quad sys_prctl
 679         .quad stub32_rt_sigreturn
 680         .quad sys32_rt_sigaction
 681         .quad sys32_rt_sigprocmask      /* 175 */
 682         .quad sys32_rt_sigpending
 683         .quad compat_sys_rt_sigtimedwait
 684         .quad sys32_rt_sigqueueinfo
 685         .quad sys_rt_sigsuspend
 686         .quad sys32_pread               /* 180 */
 687         .quad sys32_pwrite
 688         .quad sys_chown16
 689         .quad sys_getcwd
 690         .quad sys_capget
 691         .quad sys_capset
 692         .quad stub32_sigaltstack
 693         .quad sys32_sendfile
 694         .quad quiet_ni_syscall          /* streams1 */
 695         .quad quiet_ni_syscall          /* streams2 */
 696         .quad stub32_vfork            /* 190 */
 697         .quad compat_sys_getrlimit
 698         .quad sys_mmap_pgoff
 699         .quad sys32_truncate64
 700         .quad sys32_ftruncate64
 701         .quad sys32_stat64              /* 195 */
 702         .quad sys32_lstat64
 703         .quad sys32_fstat64
 704         .quad sys_lchown
 705         .quad sys_getuid
 706         .quad sys_getgid                /* 200 */
 707         .quad sys_geteuid
 708         .quad sys_getegid
 709         .quad sys_setreuid
 710         .quad sys_setregid
 711         .quad sys_getgroups     /* 205 */
 712         .quad sys_setgroups
 713         .quad sys_fchown
 714         .quad sys_setresuid
 715         .quad sys_getresuid
 716         .quad sys_setresgid     /* 210 */
 717         .quad sys_getresgid
 718         .quad sys_chown
 719         .quad sys_setuid
 720         .quad sys_setgid
 721         .quad sys_setfsuid              /* 215 */
 722         .quad sys_setfsgid
 723         .quad sys_pivot_root
 724         .quad sys_mincore
 725         .quad sys_madvise
 726         .quad compat_sys_getdents64     /* 220 getdents64 */
 727         .quad compat_sys_fcntl64
 728         .quad quiet_ni_syscall          /* tux */
 729         .quad quiet_ni_syscall          /* security */
 730         .quad sys_gettid
 731         .quad sys32_readahead   /* 225 */
 732         .quad sys_setxattr
 733         .quad sys_lsetxattr
 734         .quad sys_fsetxattr
 735         .quad sys_getxattr
 736         .quad sys_lgetxattr     /* 230 */
 737         .quad sys_fgetxattr
 738         .quad sys_listxattr
 739         .quad sys_llistxattr
 740         .quad sys_flistxattr
 741         .quad sys_removexattr   /* 235 */
 742         .quad sys_lremovexattr
 743         .quad sys_fremovexattr
 744         .quad sys_tkill
 745         .quad sys_sendfile64
 746         .quad compat_sys_futex          /* 240 */
 747         .quad compat_sys_sched_setaffinity
 748         .quad compat_sys_sched_getaffinity
 749         .quad sys_set_thread_area
 750         .quad sys_get_thread_area
 751         .quad compat_sys_io_setup       /* 245 */
 752         .quad sys_io_destroy
 753         .quad compat_sys_io_getevents
 754         .quad compat_sys_io_submit
 755         .quad sys_io_cancel
 756         .quad sys32_fadvise64           /* 250 */
 757         .quad quiet_ni_syscall  /* free_huge_pages */
 758         .quad sys_exit_group
 759         .quad sys32_lookup_dcookie
 760         .quad sys_epoll_create
 761         .quad sys_epoll_ctl             /* 255 */
 762         .quad sys_epoll_wait
 763         .quad sys_remap_file_pages
 764         .quad sys_set_tid_address
 765         .quad compat_sys_timer_create
 766         .quad compat_sys_timer_settime  /* 260 */
 767         .quad compat_sys_timer_gettime
 768         .quad sys_timer_getoverrun
 769         .quad sys_timer_delete
 770         .quad compat_sys_clock_settime
 771         .quad compat_sys_clock_gettime  /* 265 */
 772         .quad compat_sys_clock_getres
 773         .quad compat_sys_clock_nanosleep
 774         .quad compat_sys_statfs64
 775         .quad compat_sys_fstatfs64
 776         .quad sys_tgkill                /* 270 */
 777         .quad compat_sys_utimes
 778         .quad sys32_fadvise64_64
 779         .quad quiet_ni_syscall  /* sys_vserver */
 780         .quad sys_mbind
 781         .quad compat_sys_get_mempolicy  /* 275 */
 782         .quad sys_set_mempolicy
 783         .quad compat_sys_mq_open
 784         .quad sys_mq_unlink
 785         .quad compat_sys_mq_timedsend
 786         .quad compat_sys_mq_timedreceive        /* 280 */
 787         .quad compat_sys_mq_notify
 788         .quad compat_sys_mq_getsetattr
 789         .quad compat_sys_kexec_load     /* reserved for kexec */
 790         .quad compat_sys_waitid
 791         .quad quiet_ni_syscall          /* 285: sys_altroot */
 792         .quad sys_add_key
 793         .quad sys_request_key
 794         .quad sys_keyctl
 795         .quad sys_ioprio_set
 796         .quad sys_ioprio_get            /* 290 */
 797         .quad sys_inotify_init
 798         .quad sys_inotify_add_watch
 799         .quad sys_inotify_rm_watch
 800         .quad sys_migrate_pages
 801         .quad compat_sys_openat         /* 295 */
 802         .quad sys_mkdirat
 803         .quad sys_mknodat
 804         .quad sys_fchownat
 805         .quad compat_sys_futimesat
 806         .quad sys32_fstatat             /* 300 */
 807         .quad sys_unlinkat
 808         .quad sys_renameat
 809         .quad sys_linkat
 810         .quad sys_symlinkat
 811         .quad sys_readlinkat            /* 305 */
 812         .quad sys_fchmodat
 813         .quad sys_faccessat
 814         .quad compat_sys_pselect6
 815         .quad compat_sys_ppoll
 816         .quad sys_unshare               /* 310 */
 817         .quad compat_sys_set_robust_list
 818         .quad compat_sys_get_robust_list
 819         .quad sys_splice
 820         .quad sys32_sync_file_range
 821         .quad sys_tee                   /* 315 */
 822         .quad compat_sys_vmsplice
 823         .quad compat_sys_move_pages
 824         .quad sys_getcpu
 825         .quad sys_epoll_pwait
 826         .quad compat_sys_utimensat      /* 320 */
 827         .quad compat_sys_signalfd
 828         .quad sys_timerfd_create
 829         .quad sys_eventfd
 830         .quad sys32_fallocate
 831         .quad compat_sys_timerfd_settime        /* 325 */
 832         .quad compat_sys_timerfd_gettime
 833         .quad compat_sys_signalfd4
 834         .quad sys_eventfd2
 835         .quad sys_epoll_create1
 836         .quad sys_dup3                          /* 330 */
 837         .quad sys_pipe2
 838         .quad sys_inotify_init1
 839         .quad compat_sys_preadv
 840         .quad compat_sys_pwritev
 841         .quad compat_sys_rt_tgsigqueueinfo      /* 335 */
 842         .quad sys_perf_event_open
 843         .quad compat_sys_recvmmsg
 844         .quad sys_fanotify_init
 845         .quad sys32_fanotify_mark
 846         .quad sys_prlimit64             /* 340 */
 847         .quad sys_name_to_handle_at
 848         .quad compat_sys_open_by_handle_at
 849         .quad compat_sys_clock_adjtime
 850         .quad sys_syncfs
 851         .quad compat_sys_sendmmsg       /* 345 */
 852         .quad sys_setns
 853 ia32_syscall_end: