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 #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 offset=0, _r9=rax
  43         xorl    %eax,%eax
  44         movq    %rax,\offset+R11(%rsp)
  45         movq    %rax,\offset+R10(%rsp)
  46         movq    %\_r9,\offset+R9(%rsp)
  47         movq    %rax,\offset+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 %rax value we should see.  Instead, we just truncate that
  54          * value to 32 bits again as we did on entry from user mode.
  55          * If it's a new value set by user_regset during entry tracing,
  56          * this matches the normal truncation of the user-mode value.
  57          * If it's -1 to make us punt the syscall, then (u32)-1 is still
  58          * an appropriately invalid value.
  59          */
  60         .macro LOAD_ARGS32 offset, _r9=0
  61         .if \_r9
  62         movl \offset+16(%rsp),%r9d
  63         .endif
  64         movl \offset+40(%rsp),%ecx
  65         movl \offset+48(%rsp),%edx
  66         movl \offset+56(%rsp),%esi
  67         movl \offset+64(%rsp),%edi
  68         movl %eax,%eax                  /* zero extension */
  69         .endm
  70
  71         .macro CFI_STARTPROC32 simple
  72         CFI_STARTPROC   \simple
  73         CFI_UNDEFINED   r8
  74         CFI_UNDEFINED   r9
  75         CFI_UNDEFINED   r10
  76         CFI_UNDEFINED   r11
  77         CFI_UNDEFINED   r12
  78         CFI_UNDEFINED   r13
  79         CFI_UNDEFINED   r14
  80         CFI_UNDEFINED   r15
  81         .endm
  82
  83 #ifdef CONFIG_PARAVIRT
  84 ENTRY(native_usergs_sysret32)
  85         swapgs
  86         sysretl
  87 ENDPROC(native_usergs_sysret32)
  88
  89 ENTRY(native_irq_enable_sysexit)
  90         swapgs
  91         sti
  92         sysexit
  93 ENDPROC(native_irq_enable_sysexit)
  94 #endif
  95
  96 /*
  97  * 32bit SYSENTER instruction entry.
  98  *
  99  * Arguments:
 100  * %eax System call number.
 101  * %ebx Arg1
 102  * %ecx Arg2
 103  * %edx Arg3
 104  * %esi Arg4
 105  * %edi Arg5
 106  * %ebp user stack
 107  * 0(%ebp) Arg6
 108  *
 109  * Interrupts off.
 110  *
 111  * This is purely a fast path. For anything complicated we use the int 0x80
 112  * path below.  Set up a complete hardware stack frame to share code
 113  * with the int 0x80 path.
 114  */
 115 ENTRY(ia32_sysenter_target)
 116         CFI_STARTPROC32 simple
 117         CFI_SIGNAL_FRAME
 118         CFI_DEF_CFA     rsp,0
 119         CFI_REGISTER    rsp,rbp
 120         SWAPGS_UNSAFE_STACK
 121         movq    PER_CPU_VAR(kernel_stack), %rsp
 122         addq    $(KERNEL_STACK_OFFSET),%rsp
 123         /*
 124          * No need to follow this irqs on/off section: the syscall
 125          * disabled irqs, here we enable it straight after entry:
 126          */
 127         ENABLE_INTERRUPTS(CLBR_NONE)
 128         movl    %ebp,%ebp               /* zero extension */
 129         pushq   $__USER32_DS
 130         CFI_ADJUST_CFA_OFFSET 8
 131         /*CFI_REL_OFFSET ss,0*/
 132         pushq   %rbp
 133         CFI_ADJUST_CFA_OFFSET 8
 134         CFI_REL_OFFSET rsp,0
 135         pushfq
 136         CFI_ADJUST_CFA_OFFSET 8
 137         /*CFI_REL_OFFSET rflags,0*/
 138         movl    8*3-THREAD_SIZE+TI_sysenter_return(%rsp), %r10d
 139         CFI_REGISTER rip,r10
 140         pushq   $__USER32_CS
 141         CFI_ADJUST_CFA_OFFSET 8
 142         /*CFI_REL_OFFSET cs,0*/
 143         movl    %eax, %eax
 144         pushq   %r10
 145         CFI_ADJUST_CFA_OFFSET 8
 146         CFI_REL_OFFSET rip,0
 147         pushq   %rax
 148         CFI_ADJUST_CFA_OFFSET 8
 149         cld
 150         SAVE_ARGS 0,0,1
 151         /* no need to do an access_ok check here because rbp has been
 152            32bit zero extended */
 153 1:      movl    (%rbp),%ebp
 154         .section __ex_table,"a"
 155         .quad 1b,ia32_badarg
 156         .previous
 157         GET_THREAD_INFO(%r10)
 158         orl    $TS_COMPAT,TI_status(%r10)
 159         testl  $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%r10)
 160         CFI_REMEMBER_STATE
 161         jnz  sysenter_tracesys
 162         cmpq    $(IA32_NR_syscalls-1),%rax
 163         ja      ia32_badsys
 164 sysenter_do_call:
 165         IA32_ARG_FIXUP
 166 sysenter_dispatch:
 167         call    *ia32_sys_call_table(,%rax,8)
 168         movq    %rax,RAX-ARGOFFSET(%rsp)
 169         GET_THREAD_INFO(%r10)
 170         DISABLE_INTERRUPTS(CLBR_NONE)
 171         TRACE_IRQS_OFF
 172         testl   $_TIF_ALLWORK_MASK,TI_flags(%r10)
 173         jnz     sysexit_audit
 174 sysexit_from_sys_call:
 175         andl    $~TS_COMPAT,TI_status(%r10)
 176         /* clear IF, that popfq doesn't enable interrupts early */
 177         andl  $~0x200,EFLAGS-R11(%rsp)
 178         movl    RIP-R11(%rsp),%edx              /* User %eip */
 179         CFI_REGISTER rip,rdx
 180         RESTORE_ARGS 1,24,1,1,1,1
 181         xorq    %r8,%r8
 182         xorq    %r9,%r9
 183         xorq    %r10,%r10
 184         xorq    %r11,%r11
 185         popfq
 186         CFI_ADJUST_CFA_OFFSET -8
 187         /*CFI_RESTORE rflags*/
 188         popq    %rcx                            /* User %esp */
 189         CFI_ADJUST_CFA_OFFSET -8
 190         CFI_REGISTER rsp,rcx
 191         TRACE_IRQS_ON
 192         ENABLE_INTERRUPTS_SYSEXIT32
 193
 194 #ifdef CONFIG_AUDITSYSCALL
 195         .macro auditsys_entry_common
 196         movl %esi,%r9d                  /* 6th arg: 4th syscall arg */
 197         movl %edx,%r8d                  /* 5th arg: 3rd syscall arg */
 198         /* (already in %ecx)               4th arg: 2nd syscall arg */
 199         movl %ebx,%edx                  /* 3rd arg: 1st syscall arg */
 200         movl %eax,%esi                  /* 2nd arg: syscall number */
 201         movl $AUDIT_ARCH_I386,%edi      /* 1st arg: audit arch */
 202         call audit_syscall_entry
 203         movl RAX-ARGOFFSET(%rsp),%eax   /* reload syscall number */
 204         cmpq $(IA32_NR_syscalls-1),%rax
 205         ja ia32_badsys
 206         movl %ebx,%edi                  /* reload 1st syscall arg */
 207         movl RCX-ARGOFFSET(%rsp),%esi   /* reload 2nd syscall arg */
 208         movl RDX-ARGOFFSET(%rsp),%edx   /* reload 3rd syscall arg */
 209         movl RSI-ARGOFFSET(%rsp),%ecx   /* reload 4th syscall arg */
 210         movl RDI-ARGOFFSET(%rsp),%r8d   /* reload 5th syscall arg */
 211         .endm
 212
 213         .macro auditsys_exit exit
 214         testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),TI_flags(%r10)
 215         jnz ia32_ret_from_sys_call
 216         TRACE_IRQS_ON
 217         sti
 218         movl %eax,%esi          /* second arg, syscall return value */
 219         cmpl $0,%eax            /* is it < 0? */
 220         setl %al                /* 1 if so, 0 if not */
 221         movzbl %al,%edi         /* zero-extend that into %edi */
 222         inc %edi /* first arg, 0->1(AUDITSC_SUCCESS), 1->2(AUDITSC_FAILURE) */
 223         call audit_syscall_exit
 224         GET_THREAD_INFO(%r10)
 225         movl RAX-ARGOFFSET(%rsp),%eax   /* reload syscall return value */
 226         movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi
 227         cli
 228         TRACE_IRQS_OFF
 229         testl %edi,TI_flags(%r10)
 230         jz \exit
 231         CLEAR_RREGS -ARGOFFSET
 232         jmp int_with_check
 233         .endm
 234
 235 sysenter_auditsys:
 236         CFI_RESTORE_STATE
 237         auditsys_entry_common
 238         movl %ebp,%r9d                  /* reload 6th syscall arg */
 239         jmp sysenter_dispatch
 240
 241 sysexit_audit:
 242         auditsys_exit sysexit_from_sys_call
 243 #endif
 244
 245 sysenter_tracesys:
 246 #ifdef CONFIG_AUDITSYSCALL
 247         testl   $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%r10)
 248         jz      sysenter_auditsys
 249 #endif
 250         SAVE_REST
 251         CLEAR_RREGS
 252         movq    $-ENOSYS,RAX(%rsp)/* ptrace can change this for a bad syscall */
 253         movq    %rsp,%rdi        /* &pt_regs -> arg1 */
 254         call    syscall_trace_enter
 255         LOAD_ARGS32 ARGOFFSET  /* reload args from stack in case ptrace changed it */
 256         RESTORE_REST
 257         cmpq    $(IA32_NR_syscalls-1),%rax
 258         ja      int_ret_from_sys_call /* sysenter_tracesys has set RAX(%rsp) */
 259         jmp     sysenter_do_call
 260         CFI_ENDPROC
 261 ENDPROC(ia32_sysenter_target)
 262
 263 /*
 264  * 32bit SYSCALL instruction entry.
 265  *
 266  * Arguments:
 267  * %eax System call number.
 268  * %ebx Arg1
 269  * %ecx return EIP
 270  * %edx Arg3
 271  * %esi Arg4
 272  * %edi Arg5
 273  * %ebp Arg2    [note: not saved in the stack frame, should not be touched]
 274  * %esp user stack
 275  * 0(%esp) Arg6
 276  *
 277  * Interrupts off.
 278  *
 279  * This is purely a fast path. For anything complicated we use the int 0x80
 280  * path below.  Set up a complete hardware stack frame to share code
 281  * with the int 0x80 path.
 282  */
 283 ENTRY(ia32_cstar_target)
 284         CFI_STARTPROC32 simple
 285         CFI_SIGNAL_FRAME
 286         CFI_DEF_CFA     rsp,KERNEL_STACK_OFFSET
 287         CFI_REGISTER    rip,rcx
 288         /*CFI_REGISTER  rflags,r11*/
 289         SWAPGS_UNSAFE_STACK
 290         movl    %esp,%r8d
 291         CFI_REGISTER    rsp,r8
 292         movq    PER_CPU_VAR(kernel_stack),%rsp
 293         /*
 294          * No need to follow this irqs on/off section: the syscall
 295          * disabled irqs and here we enable it straight after entry:
 296          */
 297         ENABLE_INTERRUPTS(CLBR_NONE)
 298         SAVE_ARGS 8,1,1
 299         movl    %eax,%eax       /* zero extension */
 300         movq    %rax,ORIG_RAX-ARGOFFSET(%rsp)
 301         movq    %rcx,RIP-ARGOFFSET(%rsp)
 302         CFI_REL_OFFSET rip,RIP-ARGOFFSET
 303         movq    %rbp,RCX-ARGOFFSET(%rsp) /* this lies slightly to ptrace */
 304         movl    %ebp,%ecx
 305         movq    $__USER32_CS,CS-ARGOFFSET(%rsp)
 306         movq    $__USER32_DS,SS-ARGOFFSET(%rsp)
 307         movq    %r11,EFLAGS-ARGOFFSET(%rsp)
 308         /*CFI_REL_OFFSET rflags,EFLAGS-ARGOFFSET*/
 309         movq    %r8,RSP-ARGOFFSET(%rsp)
 310         CFI_REL_OFFSET rsp,RSP-ARGOFFSET
 311         /* no need to do an access_ok check here because r8 has been
 312            32bit zero extended */
 313         /* hardware stack frame is complete now */
 314 1:      movl    (%r8),%r9d
 315         .section __ex_table,"a"
 316         .quad 1b,ia32_badarg
 317         .previous
 318         GET_THREAD_INFO(%r10)
 319         orl   $TS_COMPAT,TI_status(%r10)
 320         testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%r10)
 321         CFI_REMEMBER_STATE
 322         jnz   cstar_tracesys
 323         cmpq $IA32_NR_syscalls-1,%rax
 324         ja  ia32_badsys
 325 cstar_do_call:
 326         IA32_ARG_FIXUP 1
 327 cstar_dispatch:
 328         call *ia32_sys_call_table(,%rax,8)
 329         movq %rax,RAX-ARGOFFSET(%rsp)
 330         GET_THREAD_INFO(%r10)
 331         DISABLE_INTERRUPTS(CLBR_NONE)
 332         TRACE_IRQS_OFF
 333         testl $_TIF_ALLWORK_MASK,TI_flags(%r10)
 334         jnz sysretl_audit
 335 sysretl_from_sys_call:
 336         andl $~TS_COMPAT,TI_status(%r10)
 337         RESTORE_ARGS 1,-ARG_SKIP,1,1,1
 338         movl RIP-ARGOFFSET(%rsp),%ecx
 339         CFI_REGISTER rip,rcx
 340         movl EFLAGS-ARGOFFSET(%rsp),%r11d
 341         /*CFI_REGISTER rflags,r11*/
 342         xorq    %r10,%r10
 343         xorq    %r9,%r9
 344         xorq    %r8,%r8
 345         TRACE_IRQS_ON
 346         movl RSP-ARGOFFSET(%rsp),%esp
 347         CFI_RESTORE rsp
 348         USERGS_SYSRET32
 349
 350 #ifdef CONFIG_AUDITSYSCALL
 351 cstar_auditsys:
 352         CFI_RESTORE_STATE
 353         movl %r9d,R9-ARGOFFSET(%rsp)    /* register to be clobbered by call */
 354         auditsys_entry_common
 355         movl R9-ARGOFFSET(%rsp),%r9d    /* reload 6th syscall arg */
 356         jmp cstar_dispatch
 357
 358 sysretl_audit:
 359         auditsys_exit sysretl_from_sys_call
 360 #endif
 361
 362 cstar_tracesys:
 363 #ifdef CONFIG_AUDITSYSCALL
 364         testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags(%r10)
 365         jz cstar_auditsys
 366 #endif
 367         xchgl %r9d,%ebp
 368         SAVE_REST
 369         CLEAR_RREGS 0, r9
 370         movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */
 371         movq %rsp,%rdi        /* &pt_regs -> arg1 */
 372         call syscall_trace_enter
 373         LOAD_ARGS32 ARGOFFSET, 1  /* reload args from stack in case ptrace changed it */
 374         RESTORE_REST
 375         xchgl %ebp,%r9d
 376         cmpq $(IA32_NR_syscalls-1),%rax
 377         ja int_ret_from_sys_call /* cstar_tracesys has set RAX(%rsp) */
 378         jmp cstar_do_call
 379 END(ia32_cstar_target)
 380
 381 ia32_badarg:
 382         movq $-EFAULT,%rax
 383         jmp ia32_sysret
 384         CFI_ENDPROC
 385
 386 /*
 387  * Emulated IA32 system calls via int 0x80.
 388  *
 389  * Arguments:
 390  * %eax System call number.
 391  * %ebx Arg1
 392  * %ecx Arg2
 393  * %edx Arg3
 394  * %esi Arg4
 395  * %edi Arg5
 396  * %ebp Arg6    [note: not saved in the stack frame, should not be touched]
 397  *
 398  * Notes:
 399  * Uses the same stack frame as the x86-64 version.
 400  * All registers except %eax must be saved (but ptrace may violate that)
 401  * Arguments are zero extended. For system calls that want sign extension and
 402  * take long arguments a wrapper is needed. Most calls can just be called
 403  * directly.
 404  * Assumes it is only called from user space and entered with interrupts off.
 405  */
 406
 407 ENTRY(ia32_syscall)
 408         CFI_STARTPROC32 simple
 409         CFI_SIGNAL_FRAME
 410         CFI_DEF_CFA     rsp,SS+8-RIP
 411         /*CFI_REL_OFFSET        ss,SS-RIP*/
 412         CFI_REL_OFFSET  rsp,RSP-RIP
 413         /*CFI_REL_OFFSET        rflags,EFLAGS-RIP*/
 414         /*CFI_REL_OFFSET        cs,CS-RIP*/
 415         CFI_REL_OFFSET  rip,RIP-RIP
 416         PARAVIRT_ADJUST_EXCEPTION_FRAME
 417         SWAPGS
 418         /*
 419          * No need to follow this irqs on/off section: the syscall
 420          * disabled irqs and here we enable it straight after entry:
 421          */
 422         ENABLE_INTERRUPTS(CLBR_NONE)
 423         movl %eax,%eax
 424         pushq %rax
 425         CFI_ADJUST_CFA_OFFSET 8
 426         cld
 427         /* note the registers are not zero extended to the sf.
 428            this could be a problem. */
 429         SAVE_ARGS 0,0,1
 430         GET_THREAD_INFO(%r10)
 431         orl   $TS_COMPAT,TI_status(%r10)
 432         testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%r10)
 433         jnz ia32_tracesys
 434         cmpq $(IA32_NR_syscalls-1),%rax
 435         ja ia32_badsys
 436 ia32_do_call:
 437         IA32_ARG_FIXUP
 438         call *ia32_sys_call_table(,%rax,8) # xxx: rip relative
 439 ia32_sysret:
 440         movq %rax,RAX-ARGOFFSET(%rsp)
 441 ia32_ret_from_sys_call:
 442         CLEAR_RREGS -ARGOFFSET
 443         jmp int_ret_from_sys_call
 444
 445 ia32_tracesys:
 446         SAVE_REST
 447         CLEAR_RREGS
 448         movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */
 449         movq %rsp,%rdi        /* &pt_regs -> arg1 */
 450         call syscall_trace_enter
 451         LOAD_ARGS32 ARGOFFSET  /* reload args from stack in case ptrace changed it */
 452         RESTORE_REST
 453         cmpq $(IA32_NR_syscalls-1),%rax
 454         ja  int_ret_from_sys_call       /* ia32_tracesys has set RAX(%rsp) */
 455         jmp ia32_do_call
 456 END(ia32_syscall)
 457
 458 ia32_badsys:
 459         movq $0,ORIG_RAX-ARGOFFSET(%rsp)
 460         movq $-ENOSYS,%rax
 461         jmp ia32_sysret
 462
 463 quiet_ni_syscall:
 464         movq $-ENOSYS,%rax
 465         ret
 466         CFI_ENDPROC
 467
 468         .macro PTREGSCALL label, func, arg
 469         .globl \label
 470 \label:
 471         leaq \func(%rip),%rax
 472         leaq -ARGOFFSET+8(%rsp),\arg    /* 8 for return address */
 473         jmp  ia32_ptregs_common
 474         .endm
 475
 476         CFI_STARTPROC32
 477
 478         PTREGSCALL stub32_rt_sigreturn, sys32_rt_sigreturn, %rdi
 479         PTREGSCALL stub32_sigreturn, sys32_sigreturn, %rdi
 480         PTREGSCALL stub32_sigaltstack, sys32_sigaltstack, %rdx
 481         PTREGSCALL stub32_execve, sys32_execve, %rcx
 482         PTREGSCALL stub32_fork, sys_fork, %rdi
 483         PTREGSCALL stub32_clone, sys32_clone, %rdx
 484         PTREGSCALL stub32_vfork, sys_vfork, %rdi
 485         PTREGSCALL stub32_iopl, sys_iopl, %rsi
 486
 487 ENTRY(ia32_ptregs_common)
 488         popq %r11
 489         CFI_ENDPROC
 490         CFI_STARTPROC32 simple
 491         CFI_SIGNAL_FRAME
 492         CFI_DEF_CFA     rsp,SS+8-ARGOFFSET
 493         CFI_REL_OFFSET  rax,RAX-ARGOFFSET
 494         CFI_REL_OFFSET  rcx,RCX-ARGOFFSET
 495         CFI_REL_OFFSET  rdx,RDX-ARGOFFSET
 496         CFI_REL_OFFSET  rsi,RSI-ARGOFFSET
 497         CFI_REL_OFFSET  rdi,RDI-ARGOFFSET
 498         CFI_REL_OFFSET  rip,RIP-ARGOFFSET
 499 /*      CFI_REL_OFFSET  cs,CS-ARGOFFSET*/
 500 /*      CFI_REL_OFFSET  rflags,EFLAGS-ARGOFFSET*/
 501         CFI_REL_OFFSET  rsp,RSP-ARGOFFSET
 502 /*      CFI_REL_OFFSET  ss,SS-ARGOFFSET*/
 503         SAVE_REST
 504         call *%rax
 505         RESTORE_REST
 506         jmp  ia32_sysret        /* misbalances the return cache */
 507         CFI_ENDPROC
 508 END(ia32_ptregs_common)
 509
 510         .section .rodata,"a"
 511         .align 8
 512 ia32_sys_call_table:
 513         .quad sys_restart_syscall
 514         .quad sys_exit
 515         .quad stub32_fork
 516         .quad sys_read
 517         .quad sys_write
 518         .quad compat_sys_open           /* 5 */
 519         .quad sys_close
 520         .quad sys32_waitpid
 521         .quad sys_creat
 522         .quad sys_link
 523         .quad sys_unlink                /* 10 */
 524         .quad stub32_execve
 525         .quad sys_chdir
 526         .quad compat_sys_time
 527         .quad sys_mknod
 528         .quad sys_chmod         /* 15 */
 529         .quad sys_lchown16
 530         .quad quiet_ni_syscall                  /* old break syscall holder */
 531         .quad sys_stat
 532         .quad sys32_lseek
 533         .quad sys_getpid                /* 20 */
 534         .quad compat_sys_mount  /* mount  */
 535         .quad sys_oldumount     /* old_umount  */
 536         .quad sys_setuid16
 537         .quad sys_getuid16
 538         .quad compat_sys_stime  /* stime */             /* 25 */
 539         .quad compat_sys_ptrace /* ptrace */
 540         .quad sys_alarm
 541         .quad sys_fstat /* (old)fstat */
 542         .quad sys_pause
 543         .quad compat_sys_utime  /* 30 */
 544         .quad quiet_ni_syscall  /* old stty syscall holder */
 545         .quad quiet_ni_syscall  /* old gtty syscall holder */
 546         .quad sys_access
 547         .quad sys_nice
 548         .quad quiet_ni_syscall  /* 35 */        /* old ftime syscall holder */
 549         .quad sys_sync
 550         .quad sys32_kill
 551         .quad sys_rename
 552         .quad sys_mkdir
 553         .quad sys_rmdir         /* 40 */
 554         .quad sys_dup
 555         .quad sys_pipe
 556         .quad compat_sys_times
 557         .quad quiet_ni_syscall                  /* old prof syscall holder */
 558         .quad sys_brk           /* 45 */
 559         .quad sys_setgid16
 560         .quad sys_getgid16
 561         .quad sys_signal
 562         .quad sys_geteuid16
 563         .quad sys_getegid16     /* 50 */
 564         .quad sys_acct
 565         .quad sys_umount                        /* new_umount */
 566         .quad quiet_ni_syscall                  /* old lock syscall holder */
 567         .quad compat_sys_ioctl
 568         .quad compat_sys_fcntl64                /* 55 */
 569         .quad quiet_ni_syscall                  /* old mpx syscall holder */
 570         .quad sys_setpgid
 571         .quad quiet_ni_syscall                  /* old ulimit syscall holder */
 572         .quad sys_olduname
 573         .quad sys_umask         /* 60 */
 574         .quad sys_chroot
 575         .quad compat_sys_ustat
 576         .quad sys_dup2
 577         .quad sys_getppid
 578         .quad sys_getpgrp               /* 65 */
 579         .quad sys_setsid
 580         .quad sys32_sigaction
 581         .quad sys_sgetmask
 582         .quad sys_ssetmask
 583         .quad sys_setreuid16    /* 70 */
 584         .quad sys_setregid16
 585         .quad sys32_sigsuspend
 586         .quad compat_sys_sigpending
 587         .quad sys_sethostname
 588         .quad compat_sys_setrlimit      /* 75 */
 589         .quad compat_sys_old_getrlimit  /* old_getrlimit */
 590         .quad compat_sys_getrusage
 591         .quad compat_sys_gettimeofday
 592         .quad compat_sys_settimeofday
 593         .quad sys_getgroups16   /* 80 */
 594         .quad sys_setgroups16
 595         .quad compat_sys_old_select
 596         .quad sys_symlink
 597         .quad sys_lstat
 598         .quad sys_readlink              /* 85 */
 599         .quad sys_uselib
 600         .quad sys_swapon
 601         .quad sys_reboot
 602         .quad compat_sys_old_readdir
 603         .quad sys32_mmap                /* 90 */
 604         .quad sys_munmap
 605         .quad sys_truncate
 606         .quad sys_ftruncate
 607         .quad sys_fchmod
 608         .quad sys_fchown16              /* 95 */
 609         .quad sys_getpriority
 610         .quad sys_setpriority
 611         .quad quiet_ni_syscall                  /* old profil syscall holder */
 612         .quad compat_sys_statfs
 613         .quad compat_sys_fstatfs                /* 100 */
 614         .quad sys_ioperm
 615         .quad compat_sys_socketcall
 616         .quad sys_syslog
 617         .quad compat_sys_setitimer
 618         .quad compat_sys_getitimer      /* 105 */
 619         .quad compat_sys_newstat
 620         .quad compat_sys_newlstat
 621         .quad compat_sys_newfstat
 622         .quad sys_uname
 623         .quad stub32_iopl               /* 110 */
 624         .quad sys_vhangup
 625         .quad quiet_ni_syscall  /* old "idle" system call */
 626         .quad sys32_vm86_warning        /* vm86old */
 627         .quad compat_sys_wait4
 628         .quad sys_swapoff               /* 115 */
 629         .quad compat_sys_sysinfo
 630         .quad sys32_ipc
 631         .quad sys_fsync
 632         .quad stub32_sigreturn
 633         .quad stub32_clone              /* 120 */
 634         .quad sys_setdomainname
 635         .quad sys_newuname
 636         .quad sys_modify_ldt
 637         .quad compat_sys_adjtimex
 638         .quad sys32_mprotect            /* 125 */
 639         .quad compat_sys_sigprocmask
 640         .quad quiet_ni_syscall          /* create_module */
 641         .quad sys_init_module
 642         .quad sys_delete_module
 643         .quad quiet_ni_syscall          /* 130  get_kernel_syms */
 644         .quad sys32_quotactl
 645         .quad sys_getpgid
 646         .quad sys_fchdir
 647         .quad quiet_ni_syscall  /* bdflush */
 648         .quad sys_sysfs         /* 135 */
 649         .quad sys_personality
 650         .quad quiet_ni_syscall  /* for afs_syscall */
 651         .quad sys_setfsuid16
 652         .quad sys_setfsgid16
 653         .quad sys_llseek                /* 140 */
 654         .quad compat_sys_getdents
 655         .quad compat_sys_select
 656         .quad sys_flock
 657         .quad sys_msync
 658         .quad compat_sys_readv          /* 145 */
 659         .quad compat_sys_writev
 660         .quad sys_getsid
 661         .quad sys_fdatasync
 662         .quad compat_sys_sysctl /* sysctl */
 663         .quad sys_mlock         /* 150 */
 664         .quad sys_munlock
 665         .quad sys_mlockall
 666         .quad sys_munlockall
 667         .quad sys_sched_setparam
 668         .quad sys_sched_getparam   /* 155 */
 669         .quad sys_sched_setscheduler
 670         .quad sys_sched_getscheduler
 671         .quad sys_sched_yield
 672         .quad sys_sched_get_priority_max
 673         .quad sys_sched_get_priority_min  /* 160 */
 674         .quad sys32_sched_rr_get_interval
 675         .quad compat_sys_nanosleep
 676         .quad sys_mremap
 677         .quad sys_setresuid16
 678         .quad sys_getresuid16   /* 165 */
 679         .quad sys32_vm86_warning        /* vm86 */
 680         .quad quiet_ni_syscall  /* query_module */
 681         .quad sys_poll
 682         .quad compat_sys_nfsservctl
 683         .quad sys_setresgid16   /* 170 */
 684         .quad sys_getresgid16
 685         .quad sys_prctl
 686         .quad stub32_rt_sigreturn
 687         .quad sys32_rt_sigaction
 688         .quad sys32_rt_sigprocmask      /* 175 */
 689         .quad sys32_rt_sigpending
 690         .quad compat_sys_rt_sigtimedwait
 691         .quad sys32_rt_sigqueueinfo
 692         .quad sys_rt_sigsuspend
 693         .quad sys32_pread               /* 180 */
 694         .quad sys32_pwrite
 695         .quad sys_chown16
 696         .quad sys_getcwd
 697         .quad sys_capget
 698         .quad sys_capset
 699         .quad stub32_sigaltstack
 700         .quad sys32_sendfile
 701         .quad quiet_ni_syscall          /* streams1 */
 702         .quad quiet_ni_syscall          /* streams2 */
 703         .quad stub32_vfork            /* 190 */
 704         .quad compat_sys_getrlimit
 705         .quad sys_mmap_pgoff
 706         .quad sys32_truncate64
 707         .quad sys32_ftruncate64
 708         .quad sys32_stat64              /* 195 */
 709         .quad sys32_lstat64
 710         .quad sys32_fstat64
 711         .quad sys_lchown
 712         .quad sys_getuid
 713         .quad sys_getgid                /* 200 */
 714         .quad sys_geteuid
 715         .quad sys_getegid
 716         .quad sys_setreuid
 717         .quad sys_setregid
 718         .quad sys_getgroups     /* 205 */
 719         .quad sys_setgroups
 720         .quad sys_fchown
 721         .quad sys_setresuid
 722         .quad sys_getresuid
 723         .quad sys_setresgid     /* 210 */
 724         .quad sys_getresgid
 725         .quad sys_chown
 726         .quad sys_setuid
 727         .quad sys_setgid
 728         .quad sys_setfsuid              /* 215 */
 729         .quad sys_setfsgid
 730         .quad sys_pivot_root
 731         .quad sys_mincore
 732         .quad sys_madvise
 733         .quad compat_sys_getdents64     /* 220 getdents64 */
 734         .quad compat_sys_fcntl64
 735         .quad quiet_ni_syscall          /* tux */
 736         .quad quiet_ni_syscall          /* security */
 737         .quad sys_gettid
 738         .quad sys32_readahead   /* 225 */
 739         .quad sys_setxattr
 740         .quad sys_lsetxattr
 741         .quad sys_fsetxattr
 742         .quad sys_getxattr
 743         .quad sys_lgetxattr     /* 230 */
 744         .quad sys_fgetxattr
 745         .quad sys_listxattr
 746         .quad sys_llistxattr
 747         .quad sys_flistxattr
 748         .quad sys_removexattr   /* 235 */
 749         .quad sys_lremovexattr
 750         .quad sys_fremovexattr
 751         .quad sys_tkill
 752         .quad sys_sendfile64
 753         .quad compat_sys_futex          /* 240 */
 754         .quad compat_sys_sched_setaffinity
 755         .quad compat_sys_sched_getaffinity
 756         .quad sys_set_thread_area
 757         .quad sys_get_thread_area
 758         .quad compat_sys_io_setup       /* 245 */
 759         .quad sys_io_destroy
 760         .quad compat_sys_io_getevents
 761         .quad compat_sys_io_submit
 762         .quad sys_io_cancel
 763         .quad sys32_fadvise64           /* 250 */
 764         .quad quiet_ni_syscall  /* free_huge_pages */
 765         .quad sys_exit_group
 766         .quad sys32_lookup_dcookie
 767         .quad sys_epoll_create
 768         .quad sys_epoll_ctl             /* 255 */
 769         .quad sys_epoll_wait
 770         .quad sys_remap_file_pages
 771         .quad sys_set_tid_address
 772         .quad compat_sys_timer_create
 773         .quad compat_sys_timer_settime  /* 260 */
 774         .quad compat_sys_timer_gettime
 775         .quad sys_timer_getoverrun
 776         .quad sys_timer_delete
 777         .quad compat_sys_clock_settime
 778         .quad compat_sys_clock_gettime  /* 265 */
 779         .quad compat_sys_clock_getres
 780         .quad compat_sys_clock_nanosleep
 781         .quad compat_sys_statfs64
 782         .quad compat_sys_fstatfs64
 783         .quad sys_tgkill                /* 270 */
 784         .quad compat_sys_utimes
 785         .quad sys32_fadvise64_64
 786         .quad quiet_ni_syscall  /* sys_vserver */
 787         .quad sys_mbind
 788         .quad compat_sys_get_mempolicy  /* 275 */
 789         .quad sys_set_mempolicy
 790         .quad compat_sys_mq_open
 791         .quad sys_mq_unlink
 792         .quad compat_sys_mq_timedsend
 793         .quad compat_sys_mq_timedreceive        /* 280 */
 794         .quad compat_sys_mq_notify
 795         .quad compat_sys_mq_getsetattr
 796         .quad compat_sys_kexec_load     /* reserved for kexec */
 797         .quad compat_sys_waitid
 798         .quad quiet_ni_syscall          /* 285: sys_altroot */
 799         .quad sys_add_key
 800         .quad sys_request_key
 801         .quad sys_keyctl
 802         .quad sys_ioprio_set
 803         .quad sys_ioprio_get            /* 290 */
 804         .quad sys_inotify_init
 805         .quad sys_inotify_add_watch
 806         .quad sys_inotify_rm_watch
 807         .quad sys_migrate_pages
 808         .quad compat_sys_openat         /* 295 */
 809         .quad sys_mkdirat
 810         .quad sys_mknodat
 811         .quad sys_fchownat
 812         .quad compat_sys_futimesat
 813         .quad sys32_fstatat             /* 300 */
 814         .quad sys_unlinkat
 815         .quad sys_renameat
 816         .quad sys_linkat
 817         .quad sys_symlinkat
 818         .quad sys_readlinkat            /* 305 */
 819         .quad sys_fchmodat
 820         .quad sys_faccessat
 821         .quad compat_sys_pselect6
 822         .quad compat_sys_ppoll
 823         .quad sys_unshare               /* 310 */
 824         .quad compat_sys_set_robust_list
 825         .quad compat_sys_get_robust_list
 826         .quad sys_splice
 827         .quad sys32_sync_file_range
 828         .quad sys_tee                   /* 315 */
 829         .quad compat_sys_vmsplice
 830         .quad compat_sys_move_pages
 831         .quad sys_getcpu
 832         .quad sys_epoll_pwait
 833         .quad compat_sys_utimensat      /* 320 */
 834         .quad compat_sys_signalfd
 835         .quad sys_timerfd_create
 836         .quad sys_eventfd
 837         .quad sys32_fallocate
 838         .quad compat_sys_timerfd_settime        /* 325 */
 839         .quad compat_sys_timerfd_gettime
 840         .quad compat_sys_signalfd4
 841         .quad sys_eventfd2
 842         .quad sys_epoll_create1
 843         .quad sys_dup3                          /* 330 */
 844         .quad sys_pipe2
 845         .quad sys_inotify_init1
 846         .quad compat_sys_preadv
 847         .quad compat_sys_pwritev
 848         .quad compat_sys_rt_tgsigqueueinfo      /* 335 */
 849         .quad sys_perf_event_open
 850         .quad compat_sys_recvmmsg
 851         .quad sys_fanotify_init
 852         .quad sys32_fanotify_mark
 853         .quad sys_prlimit64             /* 340 */
 854 ia32_syscall_end: