mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 14:36:46 +07:00
49955d84cd
The MIPS sysmips system call handler may return directly from the
MIPS_ATOMIC_SET case (mips_atomic_set()) to syscall_exit. This path
restores the static (callee saved) registers, however they won't have
been saved on entry to the system call.
Use the save_static_function() macro to create a __sys_sysmips wrapper
function which saves the static registers before calling sys_sysmips, so
that the correct static register state is restored by syscall_exit.
Fixes: f1e39a4a61 ("MIPS: Rewrite sysmips(MIPS_ATOMIC_SET, ...) in C with inline assembler")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: stable@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16149/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
593 lines
14 KiB
ArmAsm
593 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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sd a0, PT_R2(sp) # call routine directly on restart
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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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sd a0, PT_R4(sp) # ... and push back a0 - a3, some
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sd a1, PT_R5(sp) # syscalls expect them there
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sd a2, PT_R6(sp)
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sd a3, PT_R7(sp)
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sd a3, PT_R26(sp) # update a3 for syscall restarting
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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
|
|
PTR sys_mq_unlink
|
|
PTR compat_sys_mq_timedsend
|
|
PTR compat_sys_mq_timedreceive
|
|
PTR compat_sys_mq_notify /* 4275 */
|
|
PTR compat_sys_mq_getsetattr
|
|
PTR sys_ni_syscall /* sys_vserver */
|
|
PTR compat_sys_waitid
|
|
PTR sys_ni_syscall /* available, was setaltroot */
|
|
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
|