2 * linux/arch/m68knommu/platform/68328/entry.S
4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file README.legal in the main directory of this archive
10 * Linux/m68k support by Hamish Macdonald
13 #include <linux/sys.h>
14 #include <linux/linkage.h>
15 #include <asm/thread_info.h>
16 #include <asm/unistd.h>
17 #include <asm/errno.h>
18 #include <asm/setup.h>
19 #include <asm/segment.h>
20 #include <asm/traps.h>
21 #include <asm/asm-offsets.h>
22 #include <asm/entry.h>
28 .globl ret_from_exception
29 .globl ret_from_signal
31 .globl ret_from_interrupt
42 movel #-ENOSYS,%sp@(PT_OFF_D0)
43 jra ret_from_exception
46 movel #-ENOSYS,%sp@(PT_OFF_D0) /* needed for strace*/
49 jbsr syscall_trace_enter
52 movel %sp@(PT_OFF_ORIG_D0),%d1
57 lea sys_call_table, %a0
60 1: movel %d0,%sp@(PT_OFF_D0) /* save the return value */
61 subql #4,%sp /* dummy return address */
63 jbsr syscall_trace_leave
68 jra ret_from_exception
73 /* save top of frame*/
78 movel %sp@(PT_OFF_ORIG_D0),%d0
80 movel %sp,%d1 /* get thread_info pointer */
81 andl #-THREAD_SIZE,%d1
83 btst #(TIF_SYSCALL_TRACE%8),%a2@(TI_FLAGS+(31-TIF_SYSCALL_TRACE)/8)
88 lea sys_call_table,%a0
91 movel %d0,%sp@(PT_OFF_D0) /* save the return value*/
94 btst #5,%sp@(PT_OFF_SR) /* check if returning to kernel*/
95 jeq Luser_return /* if so, skip resched, signals*/
101 /* only allow interrupts when we are really the last one on the*/
102 /* kernel stack, otherwise stack overflow can occur during*/
103 /* heavy interrupt load*/
106 movel %sp,%d1 /* get thread_info pointer */
107 andl #-THREAD_SIZE,%d1
110 move %a2@(TI_FLAGS),%d1 /* thread_info->flags */
111 andl #_TIF_WORK_MASK,%d1
116 movel %a2@(TI_FLAGS),%d1 /* thread_info->flags */
117 btst #TIF_NEED_RESCHED,%d1
121 subql #4,%sp /* dummy return address*/
123 pea %sp@(SWITCH_STACK_SIZE)
131 * This is the main interrupt handler, responsible for calling process_int()
135 movew %sp@(PT_OFF_FORMATVEC), %d0
139 movel #65,%sp@- /* put vector # on stack*/
140 jbsr process_int /* process the IRQ*/
141 3: addql #8,%sp /* pop parameters off stack*/
142 bra ret_from_interrupt
146 movew %sp@(PT_OFF_FORMATVEC), %d0
150 movel #66,%sp@- /* put vector # on stack*/
151 jbsr process_int /* process the IRQ*/
152 3: addql #8,%sp /* pop parameters off stack*/
153 bra ret_from_interrupt
157 movew %sp@(PT_OFF_FORMATVEC), %d0
161 movel #67,%sp@- /* put vector # on stack*/
162 jbsr process_int /* process the IRQ*/
163 3: addql #8,%sp /* pop parameters off stack*/
164 bra ret_from_interrupt
168 movew %sp@(PT_OFF_FORMATVEC), %d0
172 movel #68,%sp@- /* put vector # on stack*/
173 jbsr process_int /* process the IRQ*/
174 3: addql #8,%sp /* pop parameters off stack*/
175 bra ret_from_interrupt
179 movew %sp@(PT_OFF_FORMATVEC), %d0
183 movel #69,%sp@- /* put vector # on stack*/
184 jbsr process_int /* process the IRQ*/
185 3: addql #8,%sp /* pop parameters off stack*/
186 bra ret_from_interrupt
190 movew %sp@(PT_OFF_FORMATVEC), %d0
194 movel #70,%sp@- /* put vector # on stack*/
195 jbsr process_int /* process the IRQ*/
196 3: addql #8,%sp /* pop parameters off stack*/
197 bra ret_from_interrupt
201 movew %sp@(PT_OFF_FORMATVEC), %d0
205 movel #71,%sp@- /* put vector # on stack*/
206 jbsr process_int /* process the IRQ*/
207 3: addql #8,%sp /* pop parameters off stack*/
208 bra ret_from_interrupt
212 movew %sp@(PT_OFF_FORMATVEC), %d0
216 movel %d0,%sp@- /* put vector # on stack*/
217 jbsr process_int /* process the IRQ*/
218 3: addql #8,%sp /* pop parameters off stack*/
219 bra ret_from_interrupt
226 moveb %sp@(PT_OFF_SR), %d0
230 /* check if we need to do software interrupts */
231 jeq ret_from_exception
233 pea ret_from_exception
238 * Handler for uninitialized and spurious interrupts.
241 addql #1,num_spurious
245 * Beware - when entering resume, prev (the current task) is
246 * in a0, next (the new task) is in a1,so don't change these
247 * registers until their contents are no longer needed.
250 movel %a0,%d1 /* save prev thread in d1 */
251 movew %sr,%a0@(TASK_THREAD+THREAD_SR) /* save sr */
252 movel %usp,%a2 /* save usp */
253 movel %a2,%a0@(TASK_THREAD+THREAD_USP)
256 movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack */
257 movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new thread stack */
260 movel %a1@(TASK_THREAD+THREAD_USP),%a0 /* restore user stack */
262 movew %a1@(TASK_THREAD+THREAD_SR),%sr /* restore thread status reg */