713 lines
16 KiB
ArmAsm
713 lines
16 KiB
ArmAsm
/* -*- mode: asm -*-
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*
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* linux/arch/m68k/kernel/entry.S
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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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 README.legal in the main directory of this archive
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* for more details.
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*
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* Linux/m68k support by Hamish Macdonald
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*
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* 68060 fixes by Jesper Skov
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*
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*/
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/*
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* entry.S contains the system-call and fault low-level handling routines.
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* This also contains the timer-interrupt handler, as well as all interrupts
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* and faults that can result in a task-switch.
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*
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* NOTE: This code handles signal-recognition, which happens every time
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* after a timer-interrupt and after each system call.
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*
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*/
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/*
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* 12/03/96 Jes: Currently we only support m68k single-cpu systems, so
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* all pointers that used to be 'current' are now entry
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* number 0 in the 'current_set' list.
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*
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* 6/05/00 RZ: addedd writeback completion after return from sighandler
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* for 68040
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*/
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#include <linux/config.h>
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#include <linux/linkage.h>
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#include <asm/entry.h>
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#include <asm/errno.h>
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#include <asm/setup.h>
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#include <asm/segment.h>
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#include <asm/traps.h>
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#include <asm/unistd.h>
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#include <asm/asm-offsets.h>
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.globl system_call, buserr, trap
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.globl resume, ret_from_exception
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.globl ret_from_signal
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.globl inthandler, sys_call_table
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.globl sys_fork, sys_clone, sys_vfork
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.globl ret_from_interrupt, bad_interrupt
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.text
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ENTRY(buserr)
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SAVE_ALL_INT
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GET_CURRENT(%d0)
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movel %sp,%sp@- | stack frame pointer argument
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bsrl buserr_c
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addql #4,%sp
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jra ret_from_exception
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ENTRY(trap)
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SAVE_ALL_INT
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GET_CURRENT(%d0)
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movel %sp,%sp@- | stack frame pointer argument
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bsrl trap_c
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addql #4,%sp
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jra ret_from_exception
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| After a fork we jump here directly from resume,
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| so that %d1 contains the previous task
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| schedule_tail now used regardless of CONFIG_SMP
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ENTRY(ret_from_fork)
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movel %d1,%sp@-
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jsr schedule_tail
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addql #4,%sp
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jra ret_from_exception
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badsys:
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movel #-ENOSYS,%sp@(PT_D0)
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jra ret_from_exception
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do_trace:
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movel #-ENOSYS,%sp@(PT_D0) | needed for strace
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subql #4,%sp
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SAVE_SWITCH_STACK
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jbsr syscall_trace
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RESTORE_SWITCH_STACK
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addql #4,%sp
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movel %sp@(PT_ORIG_D0),%d1
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movel #-ENOSYS,%d0
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cmpl #NR_syscalls,%d1
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jcc 1f
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jbsr @(sys_call_table,%d1:l:4)@(0)
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1: movel %d0,%sp@(PT_D0) | save the return value
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subql #4,%sp | dummy return address
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SAVE_SWITCH_STACK
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jbsr syscall_trace
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ret_from_signal:
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RESTORE_SWITCH_STACK
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addql #4,%sp
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/* on 68040 complete pending writebacks if any */
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#ifdef CONFIG_M68040
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bfextu %sp@(PT_VECTOR){#0,#4},%d0
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subql #7,%d0 | bus error frame ?
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jbne 1f
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movel %sp,%sp@-
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jbsr berr_040cleanup
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addql #4,%sp
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1:
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#endif
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jra ret_from_exception
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ENTRY(system_call)
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SAVE_ALL_SYS
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GET_CURRENT(%d1)
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| save top of frame
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movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
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tstb %curptr@(TASK_SYSCALL_TRACE)
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jne do_trace
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cmpl #NR_syscalls,%d0
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jcc badsys
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jbsr @(sys_call_table,%d0:l:4)@(0)
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movel %d0,%sp@(PT_D0) | save the return value
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|oriw #0x0700,%sr
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movel %curptr@(TASK_WORK),%d0
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jne syscall_exit_work
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1: RESTORE_ALL
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syscall_exit_work:
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btst #5,%sp@(PT_SR) | check if returning to kernel
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bnes 1b | if so, skip resched, signals
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tstw %d0
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jeq do_signal_return
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tstb %d0
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jne do_delayed_trace
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pea resume_userspace
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jmp schedule
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ret_from_exception:
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btst #5,%sp@(PT_SR) | check if returning to kernel
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bnes 1f | if so, skip resched, signals
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| only allow interrupts when we are really the last one on the
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| kernel stack, otherwise stack overflow can occur during
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| heavy interrupt load
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andw #ALLOWINT,%sr
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resume_userspace:
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movel %curptr@(TASK_WORK),%d0
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lsrl #8,%d0
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jne exit_work
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1: RESTORE_ALL
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exit_work:
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| save top of frame
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movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
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tstb %d0
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jeq do_signal_return
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pea resume_userspace
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jmp schedule
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do_signal_return:
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|andw #ALLOWINT,%sr
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subql #4,%sp | dummy return address
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SAVE_SWITCH_STACK
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pea %sp@(SWITCH_STACK_SIZE)
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clrl %sp@-
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bsrl do_signal
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addql #8,%sp
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RESTORE_SWITCH_STACK
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addql #4,%sp
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jbra resume_userspace
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do_delayed_trace:
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bclr #7,%sp@(PT_SR) | clear trace bit in SR
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pea 1 | send SIGTRAP
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movel %curptr,%sp@-
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pea LSIGTRAP
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jbsr send_sig
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addql #8,%sp
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addql #4,%sp
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jbra resume_userspace
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#if 0
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#ifdef CONFIG_AMIGA
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ami_inthandler:
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addql #1,irq_stat+CPUSTAT_LOCAL_IRQ_COUNT
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SAVE_ALL_INT
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GET_CURRENT(%d0)
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bfextu %sp@(PT_VECTOR){#4,#12},%d0
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movel %d0,%a0
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addql #1,%a0@(kstat+STAT_IRQ-VECOFF(VEC_SPUR))
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movel %a0@(autoirq_list-VECOFF(VEC_SPUR)),%a0
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| amiga vector int handler get the req mask instead of irq vector
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lea CUSTOMBASE,%a1
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movew %a1@(C_INTREQR),%d0
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andw %a1@(C_INTENAR),%d0
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| prepare stack (push frame pointer, dev_id & req mask)
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pea %sp@
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movel %a0@(IRQ_DEVID),%sp@-
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movel %d0,%sp@-
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pea %pc@(ret_from_interrupt:w)
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jbra @(IRQ_HANDLER,%a0)@(0)
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ENTRY(nmi_handler)
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rte
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#endif
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#endif
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/*
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** This is the main interrupt handler, responsible for calling process_int()
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*/
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inthandler:
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SAVE_ALL_INT
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GET_CURRENT(%d0)
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addqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+2)
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| put exception # in d0
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bfextu %sp@(PT_VECTOR){#4,#10},%d0
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movel %sp,%sp@-
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movel %d0,%sp@- | put vector # on stack
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#if defined(MACH_Q40_ONLY) && defined(CONFIG_BLK_DEV_FD)
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btstb #4,0xff000000 | Q40 floppy needs very special treatment ...
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jbeq 1f
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btstb #3,0xff000004
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jbeq 1f
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jbsr floppy_hardint
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jbra 3f
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1:
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#endif
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jbsr process_int | process the IRQ
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3: addql #8,%sp | pop parameters off stack
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ret_from_interrupt:
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subqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+2)
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jeq 1f
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2:
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RESTORE_ALL
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1:
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moveq #(~ALLOWINT>>8)&0xff,%d0
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andb %sp@(PT_SR),%d0
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jne 2b
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/* check if we need to do software interrupts */
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tstl irq_stat+CPUSTAT_SOFTIRQ_PENDING
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jeq ret_from_exception
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pea ret_from_exception
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jra do_softirq
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/* Handler for uninitialized and spurious interrupts */
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bad_interrupt:
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addql #1,num_spurious
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rte
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ENTRY(sys_fork)
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SAVE_SWITCH_STACK
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pea %sp@(SWITCH_STACK_SIZE)
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jbsr m68k_fork
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addql #4,%sp
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RESTORE_SWITCH_STACK
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rts
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ENTRY(sys_clone)
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SAVE_SWITCH_STACK
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pea %sp@(SWITCH_STACK_SIZE)
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jbsr m68k_clone
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addql #4,%sp
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RESTORE_SWITCH_STACK
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rts
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ENTRY(sys_vfork)
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SAVE_SWITCH_STACK
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pea %sp@(SWITCH_STACK_SIZE)
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jbsr m68k_vfork
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addql #4,%sp
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RESTORE_SWITCH_STACK
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rts
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ENTRY(sys_sigsuspend)
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SAVE_SWITCH_STACK
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pea %sp@(SWITCH_STACK_SIZE)
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jbsr do_sigsuspend
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addql #4,%sp
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RESTORE_SWITCH_STACK
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rts
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ENTRY(sys_rt_sigsuspend)
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SAVE_SWITCH_STACK
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pea %sp@(SWITCH_STACK_SIZE)
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jbsr do_rt_sigsuspend
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addql #4,%sp
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RESTORE_SWITCH_STACK
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rts
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ENTRY(sys_sigreturn)
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SAVE_SWITCH_STACK
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jbsr do_sigreturn
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RESTORE_SWITCH_STACK
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rts
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ENTRY(sys_rt_sigreturn)
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SAVE_SWITCH_STACK
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jbsr do_rt_sigreturn
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RESTORE_SWITCH_STACK
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rts
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resume:
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/*
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* Beware - when entering resume, prev (the current task) is
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* in a0, next (the new task) is in a1,so don't change these
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* registers until their contents are no longer needed.
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*/
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/* save sr */
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movew %sr,%a0@(TASK_THREAD+THREAD_SR)
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/* save fs (sfc,%dfc) (may be pointing to kernel memory) */
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movec %sfc,%d0
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movew %d0,%a0@(TASK_THREAD+THREAD_FS)
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/* save usp */
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/* it is better to use a movel here instead of a movew 8*) */
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movec %usp,%d0
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movel %d0,%a0@(TASK_THREAD+THREAD_USP)
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/* save non-scratch registers on stack */
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SAVE_SWITCH_STACK
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/* save current kernel stack pointer */
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movel %sp,%a0@(TASK_THREAD+THREAD_KSP)
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/* save floating point context */
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#ifndef CONFIG_M68KFPU_EMU_ONLY
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#ifdef CONFIG_M68KFPU_EMU
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tstl m68k_fputype
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jeq 3f
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#endif
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fsave %a0@(TASK_THREAD+THREAD_FPSTATE)
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#if defined(CONFIG_M68060)
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#if !defined(CPU_M68060_ONLY)
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btst #3,m68k_cputype+3
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beqs 1f
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#endif
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/* The 060 FPU keeps status in bits 15-8 of the first longword */
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tstb %a0@(TASK_THREAD+THREAD_FPSTATE+2)
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jeq 3f
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#if !defined(CPU_M68060_ONLY)
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jra 2f
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#endif
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#endif /* CONFIG_M68060 */
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#if !defined(CPU_M68060_ONLY)
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1: tstb %a0@(TASK_THREAD+THREAD_FPSTATE)
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jeq 3f
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#endif
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2: fmovemx %fp0-%fp7,%a0@(TASK_THREAD+THREAD_FPREG)
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fmoveml %fpcr/%fpsr/%fpiar,%a0@(TASK_THREAD+THREAD_FPCNTL)
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3:
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#endif /* CONFIG_M68KFPU_EMU_ONLY */
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/* Return previous task in %d1 */
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movel %curptr,%d1
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/* switch to new task (a1 contains new task) */
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movel %a1,%curptr
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/* restore floating point context */
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#ifndef CONFIG_M68KFPU_EMU_ONLY
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#ifdef CONFIG_M68KFPU_EMU
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tstl m68k_fputype
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jeq 4f
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#endif
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#if defined(CONFIG_M68060)
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#if !defined(CPU_M68060_ONLY)
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btst #3,m68k_cputype+3
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beqs 1f
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#endif
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/* The 060 FPU keeps status in bits 15-8 of the first longword */
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tstb %a1@(TASK_THREAD+THREAD_FPSTATE+2)
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jeq 3f
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#if !defined(CPU_M68060_ONLY)
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jra 2f
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#endif
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#endif /* CONFIG_M68060 */
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#if !defined(CPU_M68060_ONLY)
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1: tstb %a1@(TASK_THREAD+THREAD_FPSTATE)
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jeq 3f
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#endif
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2: fmovemx %a1@(TASK_THREAD+THREAD_FPREG),%fp0-%fp7
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fmoveml %a1@(TASK_THREAD+THREAD_FPCNTL),%fpcr/%fpsr/%fpiar
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3: frestore %a1@(TASK_THREAD+THREAD_FPSTATE)
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4:
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#endif /* CONFIG_M68KFPU_EMU_ONLY */
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/* restore the kernel stack pointer */
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movel %a1@(TASK_THREAD+THREAD_KSP),%sp
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/* restore non-scratch registers */
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RESTORE_SWITCH_STACK
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/* restore user stack pointer */
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movel %a1@(TASK_THREAD+THREAD_USP),%a0
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movel %a0,%usp
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/* restore fs (sfc,%dfc) */
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movew %a1@(TASK_THREAD+THREAD_FS),%a0
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movec %a0,%sfc
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movec %a0,%dfc
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/* restore status register */
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movew %a1@(TASK_THREAD+THREAD_SR),%sr
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rts
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.data
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ALIGN
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sys_call_table:
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.long sys_ni_syscall /* 0 - old "setup()" system call*/
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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_chown16
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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
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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 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
|
|
.long sys_fchmod
|
|
.long sys_fchown16 /* 95 */
|
|
.long sys_getpriority
|
|
.long sys_setpriority
|
|
.long sys_ni_syscall /* old profil syscall holder */
|
|
.long sys_statfs
|
|
.long sys_fstatfs /* 100 */
|
|
.long sys_ni_syscall /* ioperm for i386 */
|
|
.long sys_socketcall
|
|
.long sys_syslog
|
|
.long sys_setitimer
|
|
.long sys_getitimer /* 105 */
|
|
.long sys_newstat
|
|
.long sys_newlstat
|
|
.long sys_newfstat
|
|
.long sys_ni_syscall
|
|
.long sys_ni_syscall /* 110 */ /* iopl for i386 */
|
|
.long sys_vhangup
|
|
.long sys_ni_syscall /* obsolete idle() syscall */
|
|
.long sys_ni_syscall /* vm86old for i386 */
|
|
.long sys_wait4
|
|
.long sys_swapoff /* 115 */
|
|
.long sys_sysinfo
|
|
.long sys_ipc
|
|
.long sys_fsync
|
|
.long sys_sigreturn
|
|
.long sys_clone /* 120 */
|
|
.long sys_setdomainname
|
|
.long sys_newuname
|
|
.long sys_cacheflush /* modify_ldt for i386 */
|
|
.long sys_adjtimex
|
|
.long sys_mprotect /* 125 */
|
|
.long sys_sigprocmask
|
|
.long sys_ni_syscall /* old "create_module" */
|
|
.long sys_init_module
|
|
.long sys_delete_module
|
|
.long sys_ni_syscall /* 130 - old "get_kernel_syms" */
|
|
.long sys_quotactl
|
|
.long sys_getpgid
|
|
.long sys_fchdir
|
|
.long sys_bdflush
|
|
.long sys_sysfs /* 135 */
|
|
.long sys_personality
|
|
.long sys_ni_syscall /* for afs_syscall */
|
|
.long sys_setfsuid16
|
|
.long sys_setfsgid16
|
|
.long sys_llseek /* 140 */
|
|
.long sys_getdents
|
|
.long sys_select
|
|
.long sys_flock
|
|
.long sys_msync
|
|
.long sys_readv /* 145 */
|
|
.long sys_writev
|
|
.long sys_getsid
|
|
.long sys_fdatasync
|
|
.long sys_sysctl
|
|
.long sys_mlock /* 150 */
|
|
.long sys_munlock
|
|
.long sys_mlockall
|
|
.long sys_munlockall
|
|
.long sys_sched_setparam
|
|
.long sys_sched_getparam /* 155 */
|
|
.long sys_sched_setscheduler
|
|
.long sys_sched_getscheduler
|
|
.long sys_sched_yield
|
|
.long sys_sched_get_priority_max
|
|
.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_getpagesize
|
|
.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_lchown16;
|
|
.long sys_getcwd
|
|
.long sys_capget
|
|
.long sys_capset /* 185 */
|
|
.long sys_sigaltstack
|
|
.long sys_sendfile
|
|
.long sys_ni_syscall /* streams1 */
|
|
.long sys_ni_syscall /* 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_chown
|
|
.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_lchown
|
|
.long sys_setuid
|
|
.long sys_setgid
|
|
.long sys_setfsuid /* 215 */
|
|
.long sys_setfsgid
|
|
.long sys_pivot_root
|
|
.long sys_ni_syscall
|
|
.long sys_ni_syscall
|
|
.long sys_getdents64 /* 220 */
|
|
.long sys_gettid
|
|
.long sys_tkill
|
|
.long sys_setxattr
|
|
.long sys_lsetxattr
|
|
.long sys_fsetxattr /* 225 */
|
|
.long sys_getxattr
|
|
.long sys_lgetxattr
|
|
.long sys_fgetxattr
|
|
.long sys_listxattr
|
|
.long sys_llistxattr /* 230 */
|
|
.long sys_flistxattr
|
|
.long sys_removexattr
|
|
.long sys_lremovexattr
|
|
.long sys_fremovexattr
|
|
.long sys_futex /* 235 */
|
|
.long sys_sendfile64
|
|
.long sys_mincore
|
|
.long sys_madvise
|
|
.long sys_fcntl64
|
|
.long sys_readahead /* 240 */
|
|
.long sys_io_setup
|
|
.long sys_io_destroy
|
|
.long sys_io_getevents
|
|
.long sys_io_submit
|
|
.long sys_io_cancel /* 245 */
|
|
.long sys_fadvise64
|
|
.long sys_exit_group
|
|
.long sys_lookup_dcookie
|
|
.long sys_epoll_create
|
|
.long sys_epoll_ctl /* 250 */
|
|
.long sys_epoll_wait
|
|
.long sys_remap_file_pages
|
|
.long sys_set_tid_address
|
|
.long sys_timer_create
|
|
.long sys_timer_settime /* 255 */
|
|
.long sys_timer_gettime
|
|
.long sys_timer_getoverrun
|
|
.long sys_timer_delete
|
|
.long sys_clock_settime
|
|
.long sys_clock_gettime /* 260 */
|
|
.long sys_clock_getres
|
|
.long sys_clock_nanosleep
|
|
.long sys_statfs64
|
|
.long sys_fstatfs64
|
|
.long sys_tgkill /* 265 */
|
|
.long sys_utimes
|
|
.long sys_fadvise64_64
|
|
.long sys_mbind
|
|
.long sys_get_mempolicy
|
|
.long sys_set_mempolicy /* 270 */
|
|
.long sys_mq_open
|
|
.long sys_mq_unlink
|
|
.long sys_mq_timedsend
|
|
.long sys_mq_timedreceive
|
|
.long sys_mq_notify /* 275 */
|
|
.long sys_mq_getsetattr
|
|
.long sys_waitid
|
|
.long sys_ni_syscall /* for sys_vserver */
|
|
.long sys_add_key
|
|
.long sys_request_key /* 280 */
|
|
.long sys_keyctl
|
|
|