5af2ed3669
If a restartable syscall is called using the indirect o32 syscall handler - eg: syscall(__NR_waitid, ...), then it is possible for the incorrect arguments to be passed to the syscall after it has been restarted. This is because the syscall handler tries to shift all the registers down one place in pt_regs so that when the syscall is restarted, the "real" syscall is called instead. Unfortunately it only shifts the arguments passed in registers, not the arguments on the user stack. This causes the 4th argument to be duplicated when the syscall is restarted. Fix by removing all the pt_regs shifting so that the indirect syscall handler is called again when the syscall is restarted. The comment "some syscalls like execve get their arguments from struct pt_regs" is long out of date so this should now be safe. Signed-off-by: James Cowgill <James.Cowgill@imgtec.com> Reviewed-by: James Hogan <james.hogan@imgtec.com> Tested-by: James Hogan <james.hogan@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/15856/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
587 lines
14 KiB
ArmAsm
587 lines
14 KiB
ArmAsm
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1995 - 2000, 2001 by Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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* Copyright (C) 2001 MIPS Technologies, Inc.
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* Copyright (C) 2004 Thiemo Seufer
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*
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* Hairy, the userspace application uses a different argument passing
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* convention than the kernel, so we have to translate things from o32
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* to ABI64 calling convention. 64-bit syscalls are also processed
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* here for now.
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*/
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#include <linux/errno.h>
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#include <asm/asm.h>
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#include <asm/asmmacro.h>
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#include <asm/irqflags.h>
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#include <asm/mipsregs.h>
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#include <asm/regdef.h>
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#include <asm/stackframe.h>
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#include <asm/thread_info.h>
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#include <asm/unistd.h>
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#include <asm/sysmips.h>
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.align 5
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NESTED(handle_sys, PT_SIZE, sp)
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.set noat
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SAVE_SOME
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TRACE_IRQS_ON_RELOAD
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STI
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.set at
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ld t1, PT_EPC(sp) # skip syscall on return
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dsubu t0, v0, __NR_O32_Linux # check syscall number
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sltiu t0, t0, __NR_O32_Linux_syscalls + 1
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daddiu t1, 4 # skip to next instruction
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sd t1, PT_EPC(sp)
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beqz t0, not_o32_scall
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#if 0
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SAVE_ALL
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move a1, v0
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PRINT("Scall %ld\n")
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RESTORE_ALL
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#endif
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/* We don't want to stumble over broken sign extensions from
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userland. O32 does never use the upper half. */
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sll a0, a0, 0
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sll a1, a1, 0
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sll a2, a2, 0
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sll a3, a3, 0
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sd a3, PT_R26(sp) # save a3 for syscall restarting
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/*
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* More than four arguments. Try to deal with it by copying the
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* stack arguments from the user stack to the kernel stack.
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* This Sucks (TM).
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*
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* We intentionally keep the kernel stack a little below the top of
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* userspace so we don't have to do a slower byte accurate check here.
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*/
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ld t0, PT_R29(sp) # get old user stack pointer
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daddu t1, t0, 32
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bltz t1, bad_stack
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load_a4: lw a4, 16(t0) # argument #5 from usp
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load_a5: lw a5, 20(t0) # argument #6 from usp
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load_a6: lw a6, 24(t0) # argument #7 from usp
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load_a7: lw a7, 28(t0) # argument #8 from usp
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loads_done:
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.section __ex_table,"a"
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PTR load_a4, bad_stack_a4
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PTR load_a5, bad_stack_a5
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PTR load_a6, bad_stack_a6
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PTR load_a7, bad_stack_a7
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.previous
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li t1, _TIF_WORK_SYSCALL_ENTRY
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LONG_L t0, TI_FLAGS($28) # syscall tracing enabled?
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and t0, t1, t0
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bnez t0, trace_a_syscall
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syscall_common:
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dsll t0, v0, 3 # offset into table
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ld t2, (sys32_call_table - (__NR_O32_Linux * 8))(t0)
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jalr t2 # Do The Real Thing (TM)
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li t0, -EMAXERRNO - 1 # error?
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sltu t0, t0, v0
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sd t0, PT_R7(sp) # set error flag
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beqz t0, 1f
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ld t1, PT_R2(sp) # syscall number
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dnegu v0 # error
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sd t1, PT_R0(sp) # save it for syscall restarting
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1: sd v0, PT_R2(sp) # result
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o32_syscall_exit:
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j syscall_exit_partial
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/* ------------------------------------------------------------------------ */
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trace_a_syscall:
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SAVE_STATIC
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sd a4, PT_R8(sp) # Save argument registers
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sd a5, PT_R9(sp)
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sd a6, PT_R10(sp)
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sd a7, PT_R11(sp) # For indirect syscalls
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move a0, sp
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/*
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* absolute syscall number is in v0 unless we called syscall(__NR_###)
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* where the real syscall number is in a0
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* note: NR_syscall is the first O32 syscall but the macro is
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* only defined when compiling with -mabi=32 (CONFIG_32BIT)
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* therefore __NR_O32_Linux is used (4000)
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*/
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.set push
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.set reorder
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subu t1, v0, __NR_O32_Linux
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move a1, v0
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bnez t1, 1f /* __NR_syscall at offset 0 */
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lw a1, PT_R4(sp) /* Arg1 for __NR_syscall case */
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.set pop
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1: jal syscall_trace_enter
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bltz v0, 1f # seccomp failed? Skip syscall
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RESTORE_STATIC
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ld v0, PT_R2(sp) # Restore syscall (maybe modified)
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ld a0, PT_R4(sp) # Restore argument registers
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ld a1, PT_R5(sp)
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ld a2, PT_R6(sp)
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ld a3, PT_R7(sp)
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ld a4, PT_R8(sp)
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ld a5, PT_R9(sp)
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ld a6, PT_R10(sp)
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ld a7, PT_R11(sp) # For indirect syscalls
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dsubu t0, v0, __NR_O32_Linux # check (new) syscall number
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sltiu t0, t0, __NR_O32_Linux_syscalls + 1
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beqz t0, not_o32_scall
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j syscall_common
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1: j syscall_exit
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/* ------------------------------------------------------------------------ */
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/*
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* The stackpointer for a call with more than 4 arguments is bad.
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*/
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bad_stack:
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li v0, EFAULT
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sd v0, PT_R2(sp)
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li t0, 1 # set error flag
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sd t0, PT_R7(sp)
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j o32_syscall_exit
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bad_stack_a4:
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li a4, 0
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b load_a5
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bad_stack_a5:
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li a5, 0
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b load_a6
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bad_stack_a6:
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li a6, 0
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b load_a7
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bad_stack_a7:
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li a7, 0
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b loads_done
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not_o32_scall:
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/*
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* This is not an o32 compatibility syscall, pass it on
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* to the 64-bit syscall handlers.
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*/
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#ifdef CONFIG_MIPS32_N32
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j handle_sysn32
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#else
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j handle_sys64
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#endif
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END(handle_sys)
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LEAF(sys32_syscall)
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subu t0, a0, __NR_O32_Linux # check syscall number
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sltiu v0, t0, __NR_O32_Linux_syscalls + 1
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beqz t0, einval # do not recurse
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dsll t1, t0, 3
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beqz v0, einval
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ld t2, sys32_call_table(t1) # syscall routine
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move a0, a1 # shift argument registers
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move a1, a2
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move a2, a3
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move a3, a4
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move a4, a5
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move a5, a6
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move a6, a7
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jr t2
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/* Unreached */
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einval: li v0, -ENOSYS
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jr ra
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END(sys32_syscall)
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.align 3
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.type sys32_call_table,@object
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EXPORT(sys32_call_table)
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PTR sys32_syscall /* 4000 */
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PTR sys_exit
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PTR __sys_fork
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PTR sys_read
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PTR sys_write
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PTR compat_sys_open /* 4005 */
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PTR sys_close
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PTR sys_waitpid
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PTR sys_creat
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PTR sys_link
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PTR sys_unlink /* 4010 */
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PTR compat_sys_execve
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PTR sys_chdir
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PTR compat_sys_time
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PTR sys_mknod
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PTR sys_chmod /* 4015 */
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PTR sys_lchown
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PTR sys_ni_syscall
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PTR sys_ni_syscall /* was sys_stat */
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PTR sys_lseek
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PTR sys_getpid /* 4020 */
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PTR compat_sys_mount
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PTR sys_oldumount
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PTR sys_setuid
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PTR sys_getuid
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PTR compat_sys_stime /* 4025 */
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PTR compat_sys_ptrace
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PTR sys_alarm
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PTR sys_ni_syscall /* was sys_fstat */
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PTR sys_pause
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PTR compat_sys_utime /* 4030 */
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PTR sys_ni_syscall
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PTR sys_ni_syscall
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PTR sys_access
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PTR sys_nice
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PTR sys_ni_syscall /* 4035 */
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PTR sys_sync
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PTR sys_kill
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PTR sys_rename
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PTR sys_mkdir
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PTR sys_rmdir /* 4040 */
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PTR sys_dup
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PTR sysm_pipe
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PTR compat_sys_times
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PTR sys_ni_syscall
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PTR sys_brk /* 4045 */
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PTR sys_setgid
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PTR sys_getgid
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PTR sys_ni_syscall /* was signal 2 */
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PTR sys_geteuid
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PTR sys_getegid /* 4050 */
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PTR sys_acct
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PTR sys_umount
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PTR sys_ni_syscall
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PTR compat_sys_ioctl
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PTR compat_sys_fcntl /* 4055 */
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PTR sys_ni_syscall
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PTR sys_setpgid
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PTR sys_ni_syscall
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PTR sys_olduname
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PTR sys_umask /* 4060 */
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PTR sys_chroot
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PTR compat_sys_ustat
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PTR sys_dup2
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PTR sys_getppid
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PTR sys_getpgrp /* 4065 */
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PTR sys_setsid
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PTR sys_32_sigaction
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PTR sys_sgetmask
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PTR sys_ssetmask
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PTR sys_setreuid /* 4070 */
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PTR sys_setregid
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PTR sys32_sigsuspend
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PTR compat_sys_sigpending
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PTR sys_sethostname
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PTR compat_sys_setrlimit /* 4075 */
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PTR compat_sys_getrlimit
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PTR compat_sys_getrusage
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PTR compat_sys_gettimeofday
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PTR compat_sys_settimeofday
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PTR sys_getgroups /* 4080 */
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PTR sys_setgroups
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PTR sys_ni_syscall /* old_select */
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PTR sys_symlink
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PTR sys_ni_syscall /* was sys_lstat */
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PTR sys_readlink /* 4085 */
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PTR sys_uselib
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PTR sys_swapon
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PTR sys_reboot
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PTR compat_sys_old_readdir
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PTR sys_mips_mmap /* 4090 */
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PTR sys_munmap
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PTR compat_sys_truncate
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PTR compat_sys_ftruncate
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PTR sys_fchmod
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PTR sys_fchown /* 4095 */
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PTR sys_getpriority
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PTR sys_setpriority
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PTR sys_ni_syscall
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PTR compat_sys_statfs
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PTR compat_sys_fstatfs /* 4100 */
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PTR sys_ni_syscall /* sys_ioperm */
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PTR compat_sys_socketcall
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PTR sys_syslog
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PTR compat_sys_setitimer
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PTR compat_sys_getitimer /* 4105 */
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PTR compat_sys_newstat
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PTR compat_sys_newlstat
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PTR compat_sys_newfstat
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PTR sys_uname
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PTR sys_ni_syscall /* sys_ioperm *//* 4110 */
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PTR sys_vhangup
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PTR sys_ni_syscall /* was sys_idle */
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PTR sys_ni_syscall /* sys_vm86 */
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PTR compat_sys_wait4
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PTR sys_swapoff /* 4115 */
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PTR compat_sys_sysinfo
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PTR compat_sys_ipc
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PTR sys_fsync
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PTR sys32_sigreturn
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PTR __sys_clone /* 4120 */
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PTR sys_setdomainname
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PTR sys_newuname
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PTR sys_ni_syscall /* sys_modify_ldt */
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PTR compat_sys_adjtimex
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PTR sys_mprotect /* 4125 */
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PTR compat_sys_sigprocmask
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PTR sys_ni_syscall /* was creat_module */
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PTR sys_init_module
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PTR sys_delete_module
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PTR sys_ni_syscall /* 4130, get_kernel_syms */
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PTR sys_quotactl
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PTR sys_getpgid
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PTR sys_fchdir
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PTR sys_bdflush
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PTR sys_sysfs /* 4135 */
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PTR sys_32_personality
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PTR sys_ni_syscall /* for afs_syscall */
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PTR sys_setfsuid
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PTR sys_setfsgid
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PTR sys_32_llseek /* 4140 */
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PTR compat_sys_getdents
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PTR compat_sys_select
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PTR sys_flock
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PTR sys_msync
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PTR compat_sys_readv /* 4145 */
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PTR compat_sys_writev
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PTR sys_cacheflush
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PTR sys_cachectl
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PTR __sys_sysmips
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PTR sys_ni_syscall /* 4150 */
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PTR sys_getsid
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PTR sys_fdatasync
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PTR compat_sys_sysctl
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PTR sys_mlock
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PTR sys_munlock /* 4155 */
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PTR sys_mlockall
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PTR sys_munlockall
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PTR sys_sched_setparam
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PTR sys_sched_getparam
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PTR sys_sched_setscheduler /* 4160 */
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PTR sys_sched_getscheduler
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PTR sys_sched_yield
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PTR sys_sched_get_priority_max
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PTR sys_sched_get_priority_min
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PTR compat_sys_sched_rr_get_interval /* 4165 */
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PTR compat_sys_nanosleep
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PTR sys_mremap
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PTR sys_accept
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PTR sys_bind
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PTR sys_connect /* 4170 */
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PTR sys_getpeername
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PTR sys_getsockname
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PTR compat_sys_getsockopt
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PTR sys_listen
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PTR compat_sys_recv /* 4175 */
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PTR compat_sys_recvfrom
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PTR compat_sys_recvmsg
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PTR sys_send
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PTR compat_sys_sendmsg
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PTR sys_sendto /* 4180 */
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PTR compat_sys_setsockopt
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PTR sys_shutdown
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PTR sys_socket
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PTR sys_socketpair
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PTR sys_setresuid /* 4185 */
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PTR sys_getresuid
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PTR sys_ni_syscall /* was query_module */
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PTR sys_poll
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PTR sys_ni_syscall /* was nfsservctl */
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PTR sys_setresgid /* 4190 */
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PTR sys_getresgid
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PTR sys_prctl
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PTR sys32_rt_sigreturn
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PTR compat_sys_rt_sigaction
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PTR compat_sys_rt_sigprocmask /* 4195 */
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PTR compat_sys_rt_sigpending
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PTR compat_sys_rt_sigtimedwait
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PTR compat_sys_rt_sigqueueinfo
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PTR compat_sys_rt_sigsuspend
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PTR sys_32_pread /* 4200 */
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PTR sys_32_pwrite
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PTR sys_chown
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PTR sys_getcwd
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PTR sys_capget
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PTR sys_capset /* 4205 */
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PTR compat_sys_sigaltstack
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PTR compat_sys_sendfile
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PTR sys_ni_syscall
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PTR sys_ni_syscall
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PTR sys_mips_mmap2 /* 4210 */
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PTR sys_32_truncate64
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PTR sys_32_ftruncate64
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PTR sys_newstat
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PTR sys_newlstat
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PTR sys_newfstat /* 4215 */
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PTR sys_pivot_root
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PTR sys_mincore
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PTR sys_madvise
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PTR sys_getdents64
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PTR compat_sys_fcntl64 /* 4220 */
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PTR sys_ni_syscall
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PTR sys_gettid
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PTR sys32_readahead
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PTR sys_setxattr
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PTR sys_lsetxattr /* 4225 */
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PTR sys_fsetxattr
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PTR sys_getxattr
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PTR sys_lgetxattr
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PTR sys_fgetxattr
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PTR sys_listxattr /* 4230 */
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PTR sys_llistxattr
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PTR sys_flistxattr
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PTR sys_removexattr
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PTR sys_lremovexattr
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PTR sys_fremovexattr /* 4235 */
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PTR sys_tkill
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PTR sys_sendfile64
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PTR compat_sys_futex
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PTR compat_sys_sched_setaffinity
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PTR compat_sys_sched_getaffinity /* 4240 */
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PTR compat_sys_io_setup
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PTR sys_io_destroy
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PTR compat_sys_io_getevents
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PTR compat_sys_io_submit
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PTR sys_io_cancel /* 4245 */
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PTR sys_exit_group
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PTR compat_sys_lookup_dcookie
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PTR sys_epoll_create
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PTR sys_epoll_ctl
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PTR sys_epoll_wait /* 4250 */
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PTR sys_remap_file_pages
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PTR sys_set_tid_address
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PTR sys_restart_syscall
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PTR sys32_fadvise64_64
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PTR compat_sys_statfs64 /* 4255 */
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PTR compat_sys_fstatfs64
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PTR compat_sys_timer_create
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PTR compat_sys_timer_settime
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PTR compat_sys_timer_gettime
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PTR sys_timer_getoverrun /* 4260 */
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PTR sys_timer_delete
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PTR compat_sys_clock_settime
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PTR compat_sys_clock_gettime
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PTR compat_sys_clock_getres
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PTR compat_sys_clock_nanosleep /* 4265 */
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PTR sys_tgkill
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PTR compat_sys_utimes
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PTR compat_sys_mbind
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PTR compat_sys_get_mempolicy
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PTR compat_sys_set_mempolicy /* 4270 */
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PTR compat_sys_mq_open
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PTR sys_mq_unlink
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PTR compat_sys_mq_timedsend
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PTR compat_sys_mq_timedreceive
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PTR compat_sys_mq_notify /* 4275 */
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PTR compat_sys_mq_getsetattr
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PTR sys_ni_syscall /* sys_vserver */
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PTR compat_sys_waitid
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PTR sys_ni_syscall /* available, was setaltroot */
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PTR sys_add_key /* 4280 */
|
|
PTR sys_request_key
|
|
PTR compat_sys_keyctl
|
|
PTR sys_set_thread_area
|
|
PTR sys_inotify_init
|
|
PTR sys_inotify_add_watch /* 4285 */
|
|
PTR sys_inotify_rm_watch
|
|
PTR compat_sys_migrate_pages
|
|
PTR compat_sys_openat
|
|
PTR sys_mkdirat
|
|
PTR sys_mknodat /* 4290 */
|
|
PTR sys_fchownat
|
|
PTR compat_sys_futimesat
|
|
PTR sys_newfstatat
|
|
PTR sys_unlinkat
|
|
PTR sys_renameat /* 4295 */
|
|
PTR sys_linkat
|
|
PTR sys_symlinkat
|
|
PTR sys_readlinkat
|
|
PTR sys_fchmodat
|
|
PTR sys_faccessat /* 4300 */
|
|
PTR compat_sys_pselect6
|
|
PTR compat_sys_ppoll
|
|
PTR sys_unshare
|
|
PTR sys_splice
|
|
PTR sys32_sync_file_range /* 4305 */
|
|
PTR sys_tee
|
|
PTR compat_sys_vmsplice
|
|
PTR compat_sys_move_pages
|
|
PTR compat_sys_set_robust_list
|
|
PTR compat_sys_get_robust_list /* 4310 */
|
|
PTR compat_sys_kexec_load
|
|
PTR sys_getcpu
|
|
PTR compat_sys_epoll_pwait
|
|
PTR sys_ioprio_set
|
|
PTR sys_ioprio_get /* 4315 */
|
|
PTR compat_sys_utimensat
|
|
PTR compat_sys_signalfd
|
|
PTR sys_ni_syscall /* was timerfd */
|
|
PTR sys_eventfd
|
|
PTR sys32_fallocate /* 4320 */
|
|
PTR sys_timerfd_create
|
|
PTR compat_sys_timerfd_gettime
|
|
PTR compat_sys_timerfd_settime
|
|
PTR compat_sys_signalfd4
|
|
PTR sys_eventfd2 /* 4325 */
|
|
PTR sys_epoll_create1
|
|
PTR sys_dup3
|
|
PTR sys_pipe2
|
|
PTR sys_inotify_init1
|
|
PTR compat_sys_preadv /* 4330 */
|
|
PTR compat_sys_pwritev
|
|
PTR compat_sys_rt_tgsigqueueinfo
|
|
PTR sys_perf_event_open
|
|
PTR sys_accept4
|
|
PTR compat_sys_recvmmsg /* 4335 */
|
|
PTR sys_fanotify_init
|
|
PTR compat_sys_fanotify_mark
|
|
PTR sys_prlimit64
|
|
PTR sys_name_to_handle_at
|
|
PTR compat_sys_open_by_handle_at /* 4340 */
|
|
PTR compat_sys_clock_adjtime
|
|
PTR sys_syncfs
|
|
PTR compat_sys_sendmmsg
|
|
PTR sys_setns
|
|
PTR compat_sys_process_vm_readv /* 4345 */
|
|
PTR compat_sys_process_vm_writev
|
|
PTR sys_kcmp
|
|
PTR sys_finit_module
|
|
PTR sys_sched_setattr
|
|
PTR sys_sched_getattr /* 4350 */
|
|
PTR sys_renameat2
|
|
PTR sys_seccomp
|
|
PTR sys_getrandom
|
|
PTR sys_memfd_create
|
|
PTR sys_bpf /* 4355 */
|
|
PTR compat_sys_execveat
|
|
PTR sys_userfaultfd
|
|
PTR sys_membarrier
|
|
PTR sys_mlock2
|
|
PTR sys_copy_file_range /* 4360 */
|
|
PTR compat_sys_preadv2
|
|
PTR compat_sys_pwritev2
|
|
PTR sys_pkey_mprotect
|
|
PTR sys_pkey_alloc
|
|
PTR sys_pkey_free /* 4365 */
|
|
PTR sys_statx
|
|
.size sys32_call_table,.-sys32_call_table
|