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   1 /*
   2  *  linux/arch/m68knommu/kernel/entry.S
   3  *
   4  *  Copyright (C) 1999-2002, Greg Ungerer (gerg@snapgear.com)
   5  *  Copyright (C) 1998  D. Jeff Dionne <jeff@lineo.ca>,
   6  *                      Kenneth Albanowski <kjahds@kjahds.com>,
   7  *  Copyright (C) 2000  Lineo Inc. (www.lineo.com)
   8  *
   9  * Based on:
  10  *
  11  *  linux/arch/m68k/kernel/entry.S
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  *
  15  * This file is subject to the terms and conditions of the GNU General Public
  16  * License.  See the file README.legal in the main directory of this archive
  17  * for more details.
  18  *
  19  * Linux/m68k support by Hamish Macdonald
  20  *
  21  * 68060 fixes by Jesper Skov
  22  * ColdFire support by Greg Ungerer (gerg@snapgear.com)
  23  * 5307 fixes by David W. Miller
  24  * linux 2.4 support David McCullough <davidm@snapgear.com>
  25  */
  26
  27 #include <linux/sys.h>
  28 #include <linux/linkage.h>
  29 #include <asm/thread_info.h>
  30 #include <asm/errno.h>
  31 #include <asm/setup.h>
  32 #include <asm/segment.h>
  33 #include <asm/asm-offsets.h>
  34 #include <asm/entry.h>
  35 #include <asm/unistd.h>
  36
  37 .text
  38
  39 .globl buserr
  40 .globl trap
  41 .globl ret_from_exception
  42 .globl ret_from_signal
  43 .globl sys_fork
  44 .globl sys_clone
  45 .globl sys_vfork
  46
  47 ENTRY(buserr)
  48         SAVE_ALL
  49         moveq   #-1,%d0
  50         movel   %d0,%sp@(PT_ORIG_D0)
  51         movel   %sp,%sp@-               /* stack frame pointer argument */
  52         jsr     buserr_c
  53         addql   #4,%sp
  54         jra     ret_from_exception
  55
  56 ENTRY(trap)
  57         SAVE_ALL
  58         moveq   #-1,%d0
  59         movel   %d0,%sp@(PT_ORIG_D0)
  60         movel   %sp,%sp@-               /* stack frame pointer argument */
  61         jsr     trap_c
  62         addql   #4,%sp
  63         jra     ret_from_exception
  64
  65 #ifdef TRAP_DBG_INTERRUPT
  66
  67 .globl dbginterrupt
  68 ENTRY(dbginterrupt)
  69         SAVE_ALL
  70         moveq   #-1,%d0
  71         movel   %d0,%sp@(PT_ORIG_D0)
  72         movel   %sp,%sp@-               /* stack frame pointer argument */
  73         jsr     dbginterrupt_c
  74         addql   #4,%sp
  75         jra     ret_from_exception
  76 #endif
  77
  78 ENTRY(reschedule)
  79         /* save top of frame */
  80         pea     %sp@
  81         jbsr    set_esp0
  82         addql   #4,%sp
  83         pea     ret_from_exception
  84         jmp     schedule
  85
  86 ENTRY(ret_from_fork)
  87         movel   %d1,%sp@-
  88         jsr     schedule_tail
  89         addql   #4,%sp
  90         jra     ret_from_exception
  91
  92 ENTRY(sys_fork)
  93         SAVE_SWITCH_STACK
  94         pea     %sp@(SWITCH_STACK_SIZE)
  95         jbsr    m68k_fork
  96         addql   #4,%sp
  97         RESTORE_SWITCH_STACK
  98         rts
  99
 100 ENTRY(sys_vfork)
 101         SAVE_SWITCH_STACK
 102         pea     %sp@(SWITCH_STACK_SIZE)
 103         jbsr    m68k_vfork
 104         addql   #4,%sp
 105         RESTORE_SWITCH_STACK
 106         rts
 107
 108 ENTRY(sys_clone)
 109         SAVE_SWITCH_STACK
 110         pea     %sp@(SWITCH_STACK_SIZE)
 111         jbsr    m68k_clone
 112         addql   #4,%sp
 113         RESTORE_SWITCH_STACK
 114         rts
 115
 116 ENTRY(sys_sigsuspend)
 117         SAVE_SWITCH_STACK
 118         pea     %sp@(SWITCH_STACK_SIZE)
 119         jbsr    do_sigsuspend
 120         addql   #4,%sp
 121         RESTORE_SWITCH_STACK
 122         rts
 123
 124 ENTRY(sys_rt_sigsuspend)
 125         SAVE_SWITCH_STACK
 126         pea     %sp@(SWITCH_STACK_SIZE)
 127         jbsr    do_rt_sigsuspend
 128         addql   #4,%sp
 129         RESTORE_SWITCH_STACK
 130         rts
 131
 132 ENTRY(sys_sigreturn)
 133         SAVE_SWITCH_STACK
 134         jbsr    do_sigreturn
 135         RESTORE_SWITCH_STACK
 136         rts
 137
 138 ENTRY(sys_rt_sigreturn)
 139         SAVE_SWITCH_STACK
 140         jbsr    do_rt_sigreturn
 141         RESTORE_SWITCH_STACK
 142         rts
 143
 144 ENTRY(ret_from_user_signal)
 145         moveq #__NR_sigreturn,%d0
 146         trap #0
 147
 148 ENTRY(ret_from_user_rt_signal)
 149         move #__NR_rt_sigreturn,%d0
 150         trap #0
 151