730 lines
17 KiB
ArmAsm
730 lines
17 KiB
ArmAsm
###############################################################################
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#
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# MN10300 Exception and interrupt entry points
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#
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# Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
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# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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# Modified by David Howells (dhowells@redhat.com)
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public Licence
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# as published by the Free Software Foundation; either version
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# 2 of the Licence, or (at your option) any later version.
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#
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###############################################################################
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#include <linux/sys.h>
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#include <linux/linkage.h>
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#include <asm/smp.h>
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#include <asm/system.h>
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#include <asm/thread_info.h>
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#include <asm/intctl-regs.h>
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#include <asm/busctl-regs.h>
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#include <asm/timer-regs.h>
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#include <unit/leds.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/errno.h>
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#include <asm/asm-offsets.h>
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#include <asm/frame.inc>
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#ifdef CONFIG_PREEMPT
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#define preempt_stop __cli
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#else
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#define preempt_stop
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#define resume_kernel restore_all
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#endif
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.macro __cli
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and ~EPSW_IM,epsw
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or EPSW_IE|MN10300_CLI_LEVEL,epsw
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nop
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nop
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nop
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.endm
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.macro __sti
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or EPSW_IE|EPSW_IM_7,epsw
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.endm
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.am33_2
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###############################################################################
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#
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# the return path for a forked child
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# - on entry, D0 holds the address of the previous task to run
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#
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###############################################################################
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ENTRY(ret_from_fork)
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call schedule_tail[],0
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GET_THREAD_INFO a2
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# return 0 to indicate child process
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clr d0
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mov d0,(REG_D0,fp)
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jmp syscall_exit
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###############################################################################
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#
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# system call handler
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#
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###############################################################################
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ENTRY(system_call)
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add -4,sp
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SAVE_ALL
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mov d0,(REG_ORIG_D0,fp)
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GET_THREAD_INFO a2
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cmp nr_syscalls,d0
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bcc syscall_badsys
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btst _TIF_SYSCALL_TRACE,(TI_flags,a2)
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bne syscall_entry_trace
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syscall_call:
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add d0,d0,a1
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add a1,a1
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mov (REG_A0,fp),d0
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mov (sys_call_table,a1),a0
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calls (a0)
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mov d0,(REG_D0,fp)
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syscall_exit:
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# make sure we don't miss an interrupt setting need_resched or
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# sigpending between sampling and the rti
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__cli
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mov (TI_flags,a2),d2
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btst _TIF_ALLWORK_MASK,d2
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bne syscall_exit_work
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restore_all:
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RESTORE_ALL
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###############################################################################
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#
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# perform work that needs to be done immediately before resumption and syscall
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# tracing
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#
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###############################################################################
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ALIGN
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syscall_exit_work:
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btst _TIF_SYSCALL_TRACE,d2
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beq work_pending
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__sti # could let syscall_trace_exit() call
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# schedule() instead
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mov fp,d0
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call syscall_trace_exit[],0 # do_syscall_trace(regs)
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jmp resume_userspace
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ALIGN
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work_pending:
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btst _TIF_NEED_RESCHED,d2
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beq work_notifysig
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work_resched:
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call schedule[],0
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# make sure we don't miss an interrupt setting need_resched or
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# sigpending between sampling and the rti
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__cli
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# is there any work to be done other than syscall tracing?
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mov (TI_flags,a2),d2
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btst _TIF_WORK_MASK,d2
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beq restore_all
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btst _TIF_NEED_RESCHED,d2
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bne work_resched
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# deal with pending signals and notify-resume requests
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work_notifysig:
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mov fp,d0
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mov d2,d1
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call do_notify_resume[],0
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jmp resume_userspace
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# perform syscall entry tracing
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syscall_entry_trace:
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mov -ENOSYS,d0
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mov d0,(REG_D0,fp)
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mov fp,d0
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call syscall_trace_entry[],0 # returns the syscall number to actually use
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mov (REG_D1,fp),d1
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cmp nr_syscalls,d0
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bcs syscall_call
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jmp syscall_exit
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syscall_badsys:
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mov -ENOSYS,d0
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mov d0,(REG_D0,fp)
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jmp resume_userspace
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# userspace resumption stub bypassing syscall exit tracing
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.globl ret_from_exception, ret_from_intr
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ALIGN
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ret_from_exception:
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preempt_stop
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ret_from_intr:
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GET_THREAD_INFO a2
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mov (REG_EPSW,fp),d0 # need to deliver signals before
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# returning to userspace
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and EPSW_nSL,d0
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beq resume_kernel # returning to supervisor mode
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ENTRY(resume_userspace)
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# make sure we don't miss an interrupt setting need_resched or
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# sigpending between sampling and the rti
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__cli
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# is there any work to be done on int/exception return?
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mov (TI_flags,a2),d2
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btst _TIF_WORK_MASK,d2
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bne work_pending
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jmp restore_all
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#ifdef CONFIG_PREEMPT
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ENTRY(resume_kernel)
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__cli
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mov (TI_preempt_count,a2),d0 # non-zero preempt_count ?
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cmp 0,d0
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bne restore_all
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need_resched:
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btst _TIF_NEED_RESCHED,(TI_flags,a2)
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beq restore_all
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mov (REG_EPSW,fp),d0
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and EPSW_IM,d0
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cmp EPSW_IM_7,d0 # interrupts off (exception path) ?
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bne restore_all
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call preempt_schedule_irq[],0
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jmp need_resched
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#endif
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###############################################################################
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#
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# IRQ handler entry point
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# - intended to be entered at multiple priorities
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#
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###############################################################################
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ENTRY(irq_handler)
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add -4,sp
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SAVE_ALL
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# it's not a syscall
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mov 0xffffffff,d0
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mov d0,(REG_ORIG_D0,fp)
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mov fp,d0
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call do_IRQ[],0 # do_IRQ(regs)
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jmp ret_from_intr
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###############################################################################
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#
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# Monitor Signal handler entry point
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#
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###############################################################################
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ENTRY(monitor_signal)
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movbu (0xae000001),d1
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cmp 1,d1
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beq monsignal
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ret [],0
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monsignal:
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or EPSW_NMID,epsw
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mov d0,a0
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mov a0,sp
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mov (REG_EPSW,fp),d1
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and ~EPSW_nSL,d1
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mov d1,(REG_EPSW,fp)
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movm (sp),[d2,d3,a2,a3,exreg0,exreg1,exother]
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mov (sp),a1
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mov a1,usp
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movm (sp),[other]
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add 4,sp
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here: jmp 0x8e000008-here+0x8e000008
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###############################################################################
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#
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# Double Fault handler entry point
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# - note that there will not be a stack, D0/A0 will hold EPSW/PC as were
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#
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###############################################################################
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.section .bss
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.balign THREAD_SIZE
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.space THREAD_SIZE
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__df_stack:
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.previous
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ENTRY(double_fault)
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mov a0,(__df_stack-4) # PC as was
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mov d0,(__df_stack-8) # EPSW as was
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mn10300_set_dbfleds # display 'db-f' on the LEDs
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mov 0xaa55aa55,d0
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mov d0,(__df_stack-12) # no ORIG_D0
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mov sp,a0 # save corrupted SP
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mov __df_stack-12,sp # emergency supervisor stack
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SAVE_ALL
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mov a0,(REG_A0,fp) # save corrupted SP as A0 (which got
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# clobbered by the CPU)
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mov fp,d0
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calls do_double_fault
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double_fault_loop:
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bra double_fault_loop
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###############################################################################
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#
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# Bus Error handler entry point
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# - handle external (async) bus errors separately
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#
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###############################################################################
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ENTRY(raw_bus_error)
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add -4,sp
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mov d0,(sp)
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mov (BCBERR),d0 # what
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btst BCBERR_BEMR_DMA,d0 # see if it was an external bus error
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beq __common_exception_aux # it wasn't
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SAVE_ALL
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mov (BCBEAR),d1 # destination of erroneous access
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mov (REG_ORIG_D0,fp),d2
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mov d2,(REG_D0,fp)
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mov -1,d2
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mov d2,(REG_ORIG_D0,fp)
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add -4,sp
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mov fp,(12,sp) # frame pointer
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call io_bus_error[],0
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jmp restore_all
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###############################################################################
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#
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# Miscellaneous exception entry points
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#
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###############################################################################
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ENTRY(nmi_handler)
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add -4,sp
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mov d0,(sp)
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mov (TBR),d0
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bra __common_exception_nonmi
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ENTRY(__common_exception)
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add -4,sp
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mov d0,(sp)
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__common_exception_aux:
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mov (TBR),d0
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and ~EPSW_NMID,epsw # turn NMIs back on if not NMI
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or EPSW_IE,epsw
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__common_exception_nonmi:
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and 0x0000FFFF,d0 # turn the exception code into a vector
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# table index
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btst 0x00000007,d0
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bne 1f
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cmp 0x00000400,d0
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bge 1f
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SAVE_ALL # build the stack frame
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mov (REG_D0,fp),a2 # get the exception number
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mov (REG_ORIG_D0,fp),d0
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mov d0,(REG_D0,fp)
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mov -1,d0
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mov d0,(REG_ORIG_D0,fp)
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#ifdef CONFIG_GDBSTUB
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btst 0x01,(gdbstub_busy)
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beq 2f
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and ~EPSW_IE,epsw
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mov fp,d0
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mov a2,d1
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call gdbstub_exception[],0 # gdbstub itself caused an exception
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bra restore_all
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2:
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#endif
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mov fp,d0 # arg 0: stacked register file
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mov a2,d1 # arg 1: exception number
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lsr 1,a2
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mov (exception_table,a2),a2
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calls (a2)
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jmp ret_from_exception
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1: pi # BUG() equivalent
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###############################################################################
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#
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# Exception handler functions table
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#
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###############################################################################
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.data
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ENTRY(exception_table)
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.rept 0x400>>1
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.long uninitialised_exception
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.endr
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.previous
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###############################################################################
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#
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# Change an entry in the exception table
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# - D0 exception code, D1 handler
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#
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###############################################################################
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ENTRY(set_excp_vector)
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lsr 1,d0
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add exception_table,d0
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mov d1,(d0)
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mov 4,d1
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#if defined(CONFIG_MN10300_CACHE_WBACK)
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jmp mn10300_dcache_flush_inv_range2
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#else
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ret [],0
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#endif
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###############################################################################
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#
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# System call table
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#
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###############################################################################
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.data
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ENTRY(sys_call_table)
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.long sys_restart_syscall /* 0 */
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.long sys_exit
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.long sys_fork
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.long sys_read
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.long sys_write
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.long sys_open /* 5 */
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.long sys_close
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.long sys_waitpid
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.long sys_creat
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.long sys_link
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.long sys_unlink /* 10 */
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.long sys_execve
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.long sys_chdir
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.long sys_time
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.long sys_mknod
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.long sys_chmod /* 15 */
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.long sys_lchown16
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.long sys_ni_syscall /* old break syscall holder */
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.long sys_stat
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.long sys_lseek
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.long sys_getpid /* 20 */
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.long sys_mount
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.long sys_oldumount
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.long sys_setuid16
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.long sys_getuid16
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.long sys_stime /* 25 */
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.long sys_ptrace
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.long sys_alarm
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.long sys_fstat
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.long sys_pause
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.long sys_utime /* 30 */
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.long sys_ni_syscall /* old stty syscall holder */
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.long sys_ni_syscall /* old gtty syscall holder */
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.long sys_access
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.long sys_nice
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.long sys_ni_syscall /* 35 - old ftime syscall holder */
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.long sys_sync
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.long sys_kill
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.long sys_rename
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.long sys_mkdir
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.long sys_rmdir /* 40 */
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.long sys_dup
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.long sys_pipe
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.long sys_times
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.long sys_ni_syscall /* old prof syscall holder */
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.long sys_brk /* 45 */
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.long sys_setgid16
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.long sys_getgid16
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.long sys_signal
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.long sys_geteuid16
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.long sys_getegid16 /* 50 */
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.long sys_acct
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.long sys_umount /* recycled never used phys() */
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.long sys_ni_syscall /* old lock syscall holder */
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.long sys_ioctl
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.long sys_fcntl /* 55 */
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.long sys_ni_syscall /* old mpx syscall holder */
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.long sys_setpgid
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.long sys_ni_syscall /* old ulimit syscall holder */
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.long sys_ni_syscall /* old sys_olduname */
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.long sys_umask /* 60 */
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.long sys_chroot
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.long sys_ustat
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.long sys_dup2
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.long sys_getppid
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.long sys_getpgrp /* 65 */
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.long sys_setsid
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.long sys_sigaction
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.long sys_sgetmask
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.long sys_ssetmask
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.long sys_setreuid16 /* 70 */
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.long sys_setregid16
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.long sys_sigsuspend
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.long sys_sigpending
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.long sys_sethostname
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.long sys_setrlimit /* 75 */
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.long sys_old_getrlimit
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.long sys_getrusage
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.long sys_gettimeofday
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.long sys_settimeofday
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.long sys_getgroups16 /* 80 */
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.long sys_setgroups16
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.long old_select
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.long sys_symlink
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.long sys_lstat
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.long sys_readlink /* 85 */
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.long sys_uselib
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.long sys_swapon
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.long sys_reboot
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.long sys_old_readdir
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.long old_mmap /* 90 */
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.long sys_munmap
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.long sys_truncate
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.long sys_ftruncate
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.long sys_fchmod
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.long sys_fchown16 /* 95 */
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.long sys_getpriority
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.long sys_setpriority
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.long sys_ni_syscall /* old profil syscall holder */
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.long sys_statfs
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.long sys_fstatfs /* 100 */
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.long sys_ni_syscall /* ioperm */
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.long sys_socketcall
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.long sys_syslog
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.long sys_setitimer
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.long sys_getitimer /* 105 */
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.long sys_newstat
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.long sys_newlstat
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.long sys_newfstat
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.long sys_ni_syscall /* old sys_uname */
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.long sys_ni_syscall /* 110 - iopl */
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.long sys_vhangup
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.long sys_ni_syscall /* old "idle" system call */
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.long sys_ni_syscall /* vm86old */
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.long sys_wait4
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.long sys_swapoff /* 115 */
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.long sys_sysinfo
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.long sys_ipc
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.long sys_fsync
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.long sys_sigreturn
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.long sys_clone /* 120 */
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.long sys_setdomainname
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.long sys_newuname
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.long sys_ni_syscall /* modify_ldt */
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.long sys_adjtimex
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.long sys_mprotect /* 125 */
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.long sys_sigprocmask
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.long sys_ni_syscall /* old "create_module" */
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.long sys_init_module
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.long sys_delete_module
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.long sys_ni_syscall /* 130: old "get_kernel_syms" */
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.long sys_quotactl
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.long sys_getpgid
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.long sys_fchdir
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.long sys_bdflush
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.long sys_sysfs /* 135 */
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.long sys_personality
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.long sys_ni_syscall /* reserved for afs_syscall */
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.long sys_setfsuid16
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.long sys_setfsgid16
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.long sys_llseek /* 140 */
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.long sys_getdents
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.long sys_select
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.long sys_flock
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.long sys_msync
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.long sys_readv /* 145 */
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.long sys_writev
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.long sys_getsid
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.long sys_fdatasync
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.long sys_sysctl
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.long sys_mlock /* 150 */
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.long sys_munlock
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.long sys_mlockall
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.long sys_munlockall
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.long sys_sched_setparam
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.long sys_sched_getparam /* 155 */
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.long sys_sched_setscheduler
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.long sys_sched_getscheduler
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.long sys_sched_yield
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.long sys_sched_get_priority_max
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.long sys_sched_get_priority_min /* 160 */
|
|
.long sys_sched_rr_get_interval
|
|
.long sys_nanosleep
|
|
.long sys_mremap
|
|
.long sys_setresuid16
|
|
.long sys_getresuid16 /* 165 */
|
|
.long sys_ni_syscall /* vm86 */
|
|
.long sys_ni_syscall /* Old sys_query_module */
|
|
.long sys_poll
|
|
.long sys_nfsservctl
|
|
.long sys_setresgid16 /* 170 */
|
|
.long sys_getresgid16
|
|
.long sys_prctl
|
|
.long sys_rt_sigreturn
|
|
.long sys_rt_sigaction
|
|
.long sys_rt_sigprocmask /* 175 */
|
|
.long sys_rt_sigpending
|
|
.long sys_rt_sigtimedwait
|
|
.long sys_rt_sigqueueinfo
|
|
.long sys_rt_sigsuspend
|
|
.long sys_pread64 /* 180 */
|
|
.long sys_pwrite64
|
|
.long sys_chown16
|
|
.long sys_getcwd
|
|
.long sys_capget
|
|
.long sys_capset /* 185 */
|
|
.long sys_sigaltstack
|
|
.long sys_sendfile
|
|
.long sys_ni_syscall /* reserved for streams1 */
|
|
.long sys_ni_syscall /* reserved for streams2 */
|
|
.long sys_vfork /* 190 */
|
|
.long sys_getrlimit
|
|
.long sys_mmap2
|
|
.long sys_truncate64
|
|
.long sys_ftruncate64
|
|
.long sys_stat64 /* 195 */
|
|
.long sys_lstat64
|
|
.long sys_fstat64
|
|
.long sys_lchown
|
|
.long sys_getuid
|
|
.long sys_getgid /* 200 */
|
|
.long sys_geteuid
|
|
.long sys_getegid
|
|
.long sys_setreuid
|
|
.long sys_setregid
|
|
.long sys_getgroups /* 205 */
|
|
.long sys_setgroups
|
|
.long sys_fchown
|
|
.long sys_setresuid
|
|
.long sys_getresuid
|
|
.long sys_setresgid /* 210 */
|
|
.long sys_getresgid
|
|
.long sys_chown
|
|
.long sys_setuid
|
|
.long sys_setgid
|
|
.long sys_setfsuid /* 215 */
|
|
.long sys_setfsgid
|
|
.long sys_pivot_root
|
|
.long sys_mincore
|
|
.long sys_madvise
|
|
.long sys_getdents64 /* 220 */
|
|
.long sys_fcntl64
|
|
.long sys_ni_syscall /* reserved for TUX */
|
|
.long sys_ni_syscall
|
|
.long sys_gettid
|
|
.long sys_readahead /* 225 */
|
|
.long sys_setxattr
|
|
.long sys_lsetxattr
|
|
.long sys_fsetxattr
|
|
.long sys_getxattr
|
|
.long sys_lgetxattr /* 230 */
|
|
.long sys_fgetxattr
|
|
.long sys_listxattr
|
|
.long sys_llistxattr
|
|
.long sys_flistxattr
|
|
.long sys_removexattr /* 235 */
|
|
.long sys_lremovexattr
|
|
.long sys_fremovexattr
|
|
.long sys_tkill
|
|
.long sys_sendfile64
|
|
.long sys_futex /* 240 */
|
|
.long sys_sched_setaffinity
|
|
.long sys_sched_getaffinity
|
|
.long sys_ni_syscall /* sys_set_thread_area */
|
|
.long sys_ni_syscall /* sys_get_thread_area */
|
|
.long sys_io_setup /* 245 */
|
|
.long sys_io_destroy
|
|
.long sys_io_getevents
|
|
.long sys_io_submit
|
|
.long sys_io_cancel
|
|
.long sys_fadvise64 /* 250 */
|
|
.long sys_ni_syscall
|
|
.long sys_exit_group
|
|
.long sys_lookup_dcookie
|
|
.long sys_epoll_create
|
|
.long sys_epoll_ctl /* 255 */
|
|
.long sys_epoll_wait
|
|
.long sys_remap_file_pages
|
|
.long sys_set_tid_address
|
|
.long sys_timer_create
|
|
.long sys_timer_settime /* 260 */
|
|
.long sys_timer_gettime
|
|
.long sys_timer_getoverrun
|
|
.long sys_timer_delete
|
|
.long sys_clock_settime
|
|
.long sys_clock_gettime /* 265 */
|
|
.long sys_clock_getres
|
|
.long sys_clock_nanosleep
|
|
.long sys_statfs64
|
|
.long sys_fstatfs64
|
|
.long sys_tgkill /* 270 */
|
|
.long sys_utimes
|
|
.long sys_fadvise64_64
|
|
.long sys_ni_syscall /* sys_vserver */
|
|
.long sys_mbind
|
|
.long sys_get_mempolicy /* 275 */
|
|
.long sys_set_mempolicy
|
|
.long sys_mq_open
|
|
.long sys_mq_unlink
|
|
.long sys_mq_timedsend
|
|
.long sys_mq_timedreceive /* 280 */
|
|
.long sys_mq_notify
|
|
.long sys_mq_getsetattr
|
|
.long sys_kexec_load
|
|
.long sys_waitid
|
|
.long sys_ni_syscall /* 285 */ /* available */
|
|
.long sys_add_key
|
|
.long sys_request_key
|
|
.long sys_keyctl
|
|
.long sys_cacheflush
|
|
.long sys_ioprio_set /* 290 */
|
|
.long sys_ioprio_get
|
|
.long sys_inotify_init
|
|
.long sys_inotify_add_watch
|
|
.long sys_inotify_rm_watch
|
|
.long sys_migrate_pages /* 295 */
|
|
.long sys_openat
|
|
.long sys_mkdirat
|
|
.long sys_mknodat
|
|
.long sys_fchownat
|
|
.long sys_futimesat /* 300 */
|
|
.long sys_fstatat64
|
|
.long sys_unlinkat
|
|
.long sys_renameat
|
|
.long sys_linkat
|
|
.long sys_symlinkat /* 305 */
|
|
.long sys_readlinkat
|
|
.long sys_fchmodat
|
|
.long sys_faccessat
|
|
.long sys_pselect6
|
|
.long sys_ppoll /* 310 */
|
|
.long sys_unshare
|
|
.long sys_set_robust_list
|
|
.long sys_get_robust_list
|
|
.long sys_splice
|
|
.long sys_sync_file_range /* 315 */
|
|
.long sys_tee
|
|
.long sys_vmsplice
|
|
.long sys_move_pages
|
|
.long sys_getcpu
|
|
.long sys_epoll_pwait /* 320 */
|
|
.long sys_utimensat
|
|
.long sys_signalfd
|
|
.long sys_timerfd_create
|
|
.long sys_eventfd
|
|
.long sys_fallocate /* 325 */
|
|
.long sys_timerfd_settime
|
|
.long sys_timerfd_gettime
|
|
.long sys_signalfd4
|
|
.long sys_eventfd2
|
|
.long sys_epoll_create1 /* 330 */
|
|
.long sys_dup3
|
|
.long sys_pipe2
|
|
.long sys_inotify_init1
|
|
.long sys_preadv
|
|
.long sys_pwritev /* 335 */
|
|
.long sys_rt_tgsigqueueinfo
|
|
.long sys_perf_counter_open
|
|
|
|
|
|
nr_syscalls=(.-sys_call_table)/4
|