644 lines
15 KiB
ArmAsm
644 lines
15 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, 96, 97, 98, 99, 2000, 01, 02 by Ralf Baechle
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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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#include <linux/config.h>
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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/mipsregs.h>
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#include <asm/regdef.h>
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#include <asm/stackframe.h>
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#include <asm/isadep.h>
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#include <asm/sysmips.h>
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#include <asm/thread_info.h>
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#include <asm/unistd.h>
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#include <asm/war.h>
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#include <asm/asm-offsets.h>
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/* Highest syscall used of any syscall flavour */
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#define MAX_SYSCALL_NO __NR_O32_Linux + __NR_O32_Linux_syscalls
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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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STI
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.set at
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lw t1, PT_EPC(sp) # skip syscall on return
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#if defined(CONFIG_BINFMT_IRIX)
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sltiu t0, v0, MAX_SYSCALL_NO + 1 # check syscall number
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#else
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subu v0, v0, __NR_O32_Linux # check syscall number
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sltiu t0, v0, __NR_O32_Linux_syscalls + 1
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#endif
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addiu t1, 4 # skip to next instruction
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sw t1, PT_EPC(sp)
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beqz t0, illegal_syscall
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sll t0, v0, 3
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la t1, sys_call_table
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addu t1, t0
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lw t2, (t1) # syscall routine
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lw t3, 4(t1) # >= 0 if we need stack arguments
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beqz t2, illegal_syscall
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sw a3, PT_R26(sp) # save a3 for syscall restarting
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bgez t3, stackargs
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stack_done:
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lw t0, TI_FLAGS($28) # syscall tracing enabled?
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li t1, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
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and t0, t1
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bnez t0, syscall_trace_entry # -> yes
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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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sw t0, PT_R7(sp) # set error flag
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beqz t0, 1f
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negu v0 # error
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sw v0, PT_R0(sp) # set flag for syscall
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# restarting
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1: sw v0, PT_R2(sp) # result
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o32_syscall_exit:
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local_irq_disable # make sure need_resched and
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# signals dont change between
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# sampling and return
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lw a2, TI_FLAGS($28) # current->work
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li t0, _TIF_ALLWORK_MASK
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and t0, a2
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bnez t0, o32_syscall_exit_work
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j restore_partial
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o32_syscall_exit_work:
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j syscall_exit_work_partial
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/* ------------------------------------------------------------------------ */
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syscall_trace_entry:
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SAVE_STATIC
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move s0, t2
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move a0, sp
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li a1, 0
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jal do_syscall_trace
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lw a0, PT_R4(sp) # Restore argument registers
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lw a1, PT_R5(sp)
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lw a2, PT_R6(sp)
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lw a3, PT_R7(sp)
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jalr s0
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li t0, -EMAXERRNO - 1 # error?
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sltu t0, t0, v0
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sw t0, PT_R7(sp) # set error flag
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beqz t0, 1f
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negu v0 # error
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sw v0, PT_R0(sp) # set flag for syscall
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# restarting
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1: sw v0, PT_R2(sp) # result
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j syscall_exit
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/* ------------------------------------------------------------------------ */
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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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stackargs:
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lw t0, PT_R29(sp) # get old user stack pointer
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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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lw t5, TI_ADDR_LIMIT($28)
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addu t4, t0, 32
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and t5, t4
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bltz t5, bad_stack # -> sp is bad
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/* Ok, copy the args from the luser stack to the kernel stack.
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* t3 is the precomputed number of instruction bytes needed to
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* load or store arguments 6-8.
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*/
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la t1, 5f # load up to 3 arguments
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subu t1, t3
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1: lw t5, 16(t0) # argument #5 from usp
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.set push
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.set noreorder
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.set nomacro
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jr t1
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addiu t1, 6f - 5f
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2: lw t8, 28(t0) # argument #8 from usp
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3: lw t7, 24(t0) # argument #7 from usp
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4: lw t6, 20(t0) # argument #6 from usp
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5: jr t1
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sw t5, 16(sp) # argument #5 to ksp
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sw t8, 28(sp) # argument #8 to ksp
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sw t7, 24(sp) # argument #7 to ksp
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sw t6, 20(sp) # argument #6 to ksp
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6: j stack_done # go back
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nop
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.set pop
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.section __ex_table,"a"
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PTR 1b,bad_stack
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PTR 2b,bad_stack
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PTR 3b,bad_stack
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PTR 4b,bad_stack
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.previous
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/*
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* The stackpointer for a call with more than 4 arguments is bad.
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* We probably should handle this case a bit more drastic.
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*/
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bad_stack:
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negu v0 # error
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sw v0, PT_R0(sp)
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sw v0, PT_R2(sp)
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li t0, 1 # set error flag
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sw t0, PT_R7(sp)
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j o32_syscall_exit
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/*
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* The system call does not exist in this kernel
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*/
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illegal_syscall:
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li v0, -ENOSYS # error
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sw v0, PT_R2(sp)
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li t0, 1 # set error flag
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sw t0, PT_R7(sp)
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j o32_syscall_exit
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END(handle_sys)
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LEAF(mips_atomic_set)
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andi v0, a1, 3 # must be word aligned
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bnez v0, bad_alignment
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lw v1, TI_ADDR_LIMIT($28) # in legal address range?
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addiu a0, a1, 4
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or a0, a0, a1
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and a0, a0, v1
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bltz a0, bad_address
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#ifdef CONFIG_CPU_HAS_LLSC
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/* Ok, this is the ll/sc case. World is sane :-) */
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1: ll v0, (a1)
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move a0, a2
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2: sc a0, (a1)
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#if R10000_LLSC_WAR
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beqzl a0, 1b
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#else
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beqz a0, 1b
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#endif
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.section __ex_table,"a"
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PTR 1b, bad_stack
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PTR 2b, bad_stack
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.previous
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#else
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sw a1, 16(sp)
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sw a2, 20(sp)
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move a0, sp
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move a2, a1
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li a1, 1
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jal do_page_fault
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lw a1, 16(sp)
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lw a2, 20(sp)
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/*
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* At this point the page should be readable and writable unless
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* there was no more memory available.
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*/
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1: lw v0, (a1)
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2: sw a2, (a1)
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.section __ex_table,"a"
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PTR 1b, no_mem
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PTR 2b, no_mem
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.previous
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#endif
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sw zero, PT_R7(sp) # success
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sw v0, PT_R2(sp) # result
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/* Success, so skip usual error handling garbage. */
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lw a2, TI_FLAGS($28) # syscall tracing enabled?
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li t0, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
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and t0, a2, t0
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bnez t0, 1f
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j o32_syscall_exit
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1: SAVE_STATIC
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move a0, sp
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li a1, 1
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jal do_syscall_trace
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j syscall_exit
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no_mem: li v0, -ENOMEM
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jr ra
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bad_address:
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li v0, -EFAULT
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jr ra
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bad_alignment:
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li v0, -EINVAL
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jr ra
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END(mips_atomic_set)
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LEAF(sys_sysmips)
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beq a0, MIPS_ATOMIC_SET, mips_atomic_set
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j _sys_sysmips
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END(sys_sysmips)
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LEAF(sys_syscall)
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#if defined(CONFIG_BINFMT_IRIX)
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sltiu v0, a0, MAX_SYSCALL_NO + 1 # check syscall number
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#else
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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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#endif
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sll t1, t0, 3
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beqz v0, einval
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lw t2, sys_call_table(t1) # syscall routine
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#if defined(CONFIG_BINFMT_IRIX)
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li v1, 4000 # nr of sys_syscall
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#else
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li v1, 4000 - __NR_O32_Linux # index of sys_syscall
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#endif
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beq t0, v1, einval # do not recurse
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/* Some syscalls like execve get their arguments from struct pt_regs
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and claim zero arguments in the syscall table. Thus we have to
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assume the worst case and shuffle around all potential arguments.
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If you want performance, don't use indirect syscalls. */
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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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lw a3, 16(sp)
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lw t4, 20(sp)
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lw t5, 24(sp)
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lw t6, 28(sp)
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sw t4, 16(sp)
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sw t5, 20(sp)
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sw t6, 24(sp)
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sw a0, PT_R4(sp) # .. and push back a0 - a3, some
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sw a1, PT_R5(sp) # syscalls expect them there
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sw a2, PT_R6(sp)
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sw a3, PT_R7(sp)
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sw 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, -EINVAL
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jr ra
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END(sys_syscall)
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.macro fifty ptr, nargs, from=1, to=50
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sys \ptr \nargs
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.if \to-\from
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fifty \ptr,\nargs,"(\from+1)",\to
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.endif
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.endm
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.macro mille ptr, nargs, from=1, to=20
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fifty \ptr,\nargs
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.if \to-\from
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mille \ptr,\nargs,"(\from+1)",\to
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.endif
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.endm
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.macro syscalltable
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#if defined(CONFIG_BINFMT_IRIX)
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mille sys_ni_syscall 0 /* 0 - 999 SVR4 flavour */
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mille sys_ni_syscall 0 /* 1000 - 1999 32-bit IRIX */
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mille sys_ni_syscall 0 /* 2000 - 2999 BSD43 flavour */
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mille sys_ni_syscall 0 /* 3000 - 3999 POSIX flavour */
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#endif
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sys sys_syscall 8 /* 4000 */
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sys sys_exit 1
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sys sys_fork 0
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sys sys_read 3
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sys sys_write 3
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sys sys_open 3 /* 4005 */
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sys sys_close 1
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sys sys_waitpid 3
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sys sys_creat 2
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sys sys_link 2
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sys sys_unlink 1 /* 4010 */
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sys sys_execve 0
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sys sys_chdir 1
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sys sys_time 1
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sys sys_mknod 3
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sys sys_chmod 2 /* 4015 */
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sys sys_lchown 3
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sys sys_ni_syscall 0
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sys sys_ni_syscall 0 /* was sys_stat */
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sys sys_lseek 3
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sys sys_getpid 0 /* 4020 */
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sys sys_mount 5
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sys sys_oldumount 1
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sys sys_setuid 1
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sys sys_getuid 0
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sys sys_stime 1 /* 4025 */
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sys sys_ptrace 4
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sys sys_alarm 1
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sys sys_ni_syscall 0 /* was sys_fstat */
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sys sys_pause 0
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sys sys_utime 2 /* 4030 */
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sys sys_ni_syscall 0
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sys sys_ni_syscall 0
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sys sys_access 2
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sys sys_nice 1
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sys sys_ni_syscall 0 /* 4035 */
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sys sys_sync 0
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sys sys_kill 2
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sys sys_rename 2
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sys sys_mkdir 2
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sys sys_rmdir 1 /* 4040 */
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sys sys_dup 1
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sys sys_pipe 0
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sys sys_times 1
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sys sys_ni_syscall 0
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sys sys_brk 1 /* 4045 */
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sys sys_setgid 1
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sys sys_getgid 0
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sys sys_ni_syscall 0 /* was signal(2) */
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sys sys_geteuid 0
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sys sys_getegid 0 /* 4050 */
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sys sys_acct 1
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sys sys_umount 2
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sys sys_ni_syscall 0
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sys sys_ioctl 3
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sys sys_fcntl 3 /* 4055 */
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sys sys_ni_syscall 2
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sys sys_setpgid 2
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sys sys_ni_syscall 0
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sys sys_olduname 1
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sys sys_umask 1 /* 4060 */
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sys sys_chroot 1
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sys sys_ustat 2
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sys sys_dup2 2
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sys sys_getppid 0
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sys sys_getpgrp 0 /* 4065 */
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sys sys_setsid 0
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sys sys_sigaction 3
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sys sys_sgetmask 0
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sys sys_ssetmask 1
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sys sys_setreuid 2 /* 4070 */
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sys sys_setregid 2
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sys sys_sigsuspend 0
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sys sys_sigpending 1
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sys sys_sethostname 2
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sys sys_setrlimit 2 /* 4075 */
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sys sys_getrlimit 2
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sys sys_getrusage 2
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sys sys_gettimeofday 2
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sys sys_settimeofday 2
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sys sys_getgroups 2 /* 4080 */
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sys sys_setgroups 2
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sys sys_ni_syscall 0 /* old_select */
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sys sys_symlink 2
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sys sys_ni_syscall 0 /* was sys_lstat */
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sys sys_readlink 3 /* 4085 */
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sys sys_uselib 1
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sys sys_swapon 2
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sys sys_reboot 3
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sys old_readdir 3
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sys old_mmap 6 /* 4090 */
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sys sys_munmap 2
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sys sys_truncate 2
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sys sys_ftruncate 2
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sys sys_fchmod 2
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sys sys_fchown 3 /* 4095 */
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sys sys_getpriority 2
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sys sys_setpriority 3
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sys sys_ni_syscall 0
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sys sys_statfs 2
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sys sys_fstatfs 2 /* 4100 */
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sys sys_ni_syscall 0 /* was ioperm(2) */
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sys sys_socketcall 2
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sys sys_syslog 3
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sys sys_setitimer 3
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sys sys_getitimer 2 /* 4105 */
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sys sys_newstat 2
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sys sys_newlstat 2
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sys sys_newfstat 2
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sys sys_uname 1
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sys sys_ni_syscall 0 /* 4110 was iopl(2) */
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sys sys_vhangup 0
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sys sys_ni_syscall 0 /* was sys_idle() */
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sys sys_ni_syscall 0 /* was sys_vm86 */
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sys sys_wait4 4
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sys sys_swapoff 1 /* 4115 */
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sys sys_sysinfo 1
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sys sys_ipc 6
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sys sys_fsync 1
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sys sys_sigreturn 0
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sys sys_clone 0 /* 4120 */
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sys sys_setdomainname 2
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sys sys_newuname 1
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sys sys_ni_syscall 0 /* sys_modify_ldt */
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sys sys_adjtimex 1
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sys sys_mprotect 3 /* 4125 */
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sys sys_sigprocmask 3
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sys sys_ni_syscall 0 /* was create_module */
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sys sys_init_module 5
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sys sys_delete_module 1
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sys sys_ni_syscall 0 /* 4130 was get_kernel_syms */
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sys sys_quotactl 4
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sys sys_getpgid 1
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sys sys_fchdir 1
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sys sys_bdflush 2
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sys sys_sysfs 3 /* 4135 */
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sys sys_personality 1
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sys sys_ni_syscall 0 /* for afs_syscall */
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sys sys_setfsuid 1
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sys sys_setfsgid 1
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sys sys_llseek 5 /* 4140 */
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sys sys_getdents 3
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sys sys_select 5
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sys sys_flock 2
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sys sys_msync 3
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sys sys_readv 3 /* 4145 */
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sys sys_writev 3
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sys sys_cacheflush 3
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sys sys_cachectl 3
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sys sys_sysmips 4
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sys sys_ni_syscall 0 /* 4150 */
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sys sys_getsid 1
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sys sys_fdatasync 1
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sys sys_sysctl 1
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sys sys_mlock 2
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sys sys_munlock 2 /* 4155 */
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sys sys_mlockall 1
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sys sys_munlockall 0
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sys sys_sched_setparam 2
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sys sys_sched_getparam 2
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sys sys_sched_setscheduler 3 /* 4160 */
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sys sys_sched_getscheduler 1
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sys sys_sched_yield 0
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sys sys_sched_get_priority_max 1
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sys sys_sched_get_priority_min 1
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sys sys_sched_rr_get_interval 2 /* 4165 */
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sys sys_nanosleep, 2
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sys sys_mremap, 4
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sys sys_accept 3
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sys sys_bind 3
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sys sys_connect 3 /* 4170 */
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sys sys_getpeername 3
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sys sys_getsockname 3
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sys sys_getsockopt 5
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sys sys_listen 2
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sys sys_recv 4 /* 4175 */
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sys sys_recvfrom 6
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sys sys_recvmsg 3
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sys sys_send 4
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sys sys_sendmsg 3
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sys sys_sendto 6 /* 4180 */
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sys sys_setsockopt 5
|
|
sys sys_shutdown 2
|
|
sys sys_socket 3
|
|
sys sys_socketpair 4
|
|
sys sys_setresuid 3 /* 4185 */
|
|
sys sys_getresuid 3
|
|
sys sys_ni_syscall 0 /* was sys_query_module */
|
|
sys sys_poll 3
|
|
sys sys_nfsservctl 3
|
|
sys sys_setresgid 3 /* 4190 */
|
|
sys sys_getresgid 3
|
|
sys sys_prctl 5
|
|
sys sys_rt_sigreturn 0
|
|
sys sys_rt_sigaction 4
|
|
sys sys_rt_sigprocmask 4 /* 4195 */
|
|
sys sys_rt_sigpending 2
|
|
sys sys_rt_sigtimedwait 4
|
|
sys sys_rt_sigqueueinfo 3
|
|
sys sys_rt_sigsuspend 0
|
|
sys sys_pread64 6 /* 4200 */
|
|
sys sys_pwrite64 6
|
|
sys sys_chown 3
|
|
sys sys_getcwd 2
|
|
sys sys_capget 2
|
|
sys sys_capset 2 /* 4205 */
|
|
sys sys_sigaltstack 0
|
|
sys sys_sendfile 4
|
|
sys sys_ni_syscall 0
|
|
sys sys_ni_syscall 0
|
|
sys sys_mmap2 6 /* 4210 */
|
|
sys sys_truncate64 4
|
|
sys sys_ftruncate64 4
|
|
sys sys_stat64 2
|
|
sys sys_lstat64 2
|
|
sys sys_fstat64 2 /* 4215 */
|
|
sys sys_pivot_root 2
|
|
sys sys_mincore 3
|
|
sys sys_madvise 3
|
|
sys sys_getdents64 3
|
|
sys sys_fcntl64 3 /* 4220 */
|
|
sys sys_ni_syscall 0
|
|
sys sys_gettid 0
|
|
sys sys_readahead 5
|
|
sys sys_setxattr 5
|
|
sys sys_lsetxattr 5 /* 4225 */
|
|
sys sys_fsetxattr 5
|
|
sys sys_getxattr 4
|
|
sys sys_lgetxattr 4
|
|
sys sys_fgetxattr 4
|
|
sys sys_listxattr 3 /* 4230 */
|
|
sys sys_llistxattr 3
|
|
sys sys_flistxattr 3
|
|
sys sys_removexattr 2
|
|
sys sys_lremovexattr 2
|
|
sys sys_fremovexattr 2 /* 4235 */
|
|
sys sys_tkill 2
|
|
sys sys_sendfile64 5
|
|
sys sys_futex 6
|
|
sys sys_sched_setaffinity 3
|
|
sys sys_sched_getaffinity 3 /* 4240 */
|
|
sys sys_io_setup 2
|
|
sys sys_io_destroy 1
|
|
sys sys_io_getevents 5
|
|
sys sys_io_submit 3
|
|
sys sys_io_cancel 3 /* 4245 */
|
|
sys sys_exit_group 1
|
|
sys sys_lookup_dcookie 3
|
|
sys sys_epoll_create 1
|
|
sys sys_epoll_ctl 4
|
|
sys sys_epoll_wait 3 /* 4250 */
|
|
sys sys_remap_file_pages 5
|
|
sys sys_set_tid_address 1
|
|
sys sys_restart_syscall 0
|
|
sys sys_fadvise64_64 7
|
|
sys sys_statfs64 3 /* 4255 */
|
|
sys sys_fstatfs64 2
|
|
sys sys_timer_create 3
|
|
sys sys_timer_settime 4
|
|
sys sys_timer_gettime 2
|
|
sys sys_timer_getoverrun 1 /* 4260 */
|
|
sys sys_timer_delete 1
|
|
sys sys_clock_settime 2
|
|
sys sys_clock_gettime 2
|
|
sys sys_clock_getres 2
|
|
sys sys_clock_nanosleep 4 /* 4265 */
|
|
sys sys_tgkill 3
|
|
sys sys_utimes 2
|
|
sys sys_mbind 4
|
|
sys sys_ni_syscall 0 /* sys_get_mempolicy */
|
|
sys sys_ni_syscall 0 /* 4270 sys_set_mempolicy */
|
|
sys sys_mq_open 4
|
|
sys sys_mq_unlink 1
|
|
sys sys_mq_timedsend 5
|
|
sys sys_mq_timedreceive 5
|
|
sys sys_mq_notify 2 /* 4275 */
|
|
sys sys_mq_getsetattr 3
|
|
sys sys_ni_syscall 0 /* sys_vserver */
|
|
sys sys_waitid 5
|
|
sys sys_ni_syscall 0 /* available, was setaltroot */
|
|
sys sys_add_key 5 /* 4280 */
|
|
sys sys_request_key 4
|
|
sys sys_keyctl 5
|
|
sys sys_set_thread_area 1
|
|
sys sys_inotify_init 0
|
|
sys sys_inotify_add_watch 3 /* 4285 */
|
|
sys sys_inotify_rm_watch 2
|
|
.endm
|
|
|
|
/* We pre-compute the number of _instruction_ bytes needed to
|
|
load or store the arguments 6-8. Negative values are ignored. */
|
|
|
|
.macro sys function, nargs
|
|
PTR \function
|
|
LONG (\nargs << 2) - (5 << 2)
|
|
.endm
|
|
|
|
.align 3
|
|
.type sys_call_table,@object
|
|
EXPORT(sys_call_table)
|
|
syscalltable
|
|
.size sys_call_table, . - sys_call_table
|