1 /* SPDX-License-Identifier: GPL-2.0-or-later
2 *
3 * entry.S -- interrupt and exception proces
4 *
5 * Copyright (C) 1999-2007, Greg Ungerer (ger
6 * Copyright (C) 1998 D. Jeff Dionne <jeff@li
7 * Kenneth Albanowski <kja
8 * Copyright (C) 2000 Lineo Inc. (www.lineo.
9 * Copyright (C) 2004-2006 Macq Electronique
10 *
11 * Based on:
12 *
13 * linux/arch/m68k/kernel/entry.S
14 *
15 * Copyright (C) 1991, 1992 Linus Torvalds
16 *
17 * Linux/m68k support by Hamish Macdonald
18 *
19 * 68060 fixes by Jesper Skov
20 * ColdFire support by Greg Ungerer (gerg@snap
21 * 5307 fixes by David W. Miller
22 * linux 2.4 support David McCullough <davidm@s
23 * Bug, speed and maintainability fixes by Phi<
24 */
25
26 #include <linux/linkage.h>
27 #include <asm/unistd.h>
28 #include <asm/thread_info.h>
29 #include <asm/errno.h>
30 #include <asm/setup.h>
31 #include <asm/asm-offsets.h>
32 #include <asm/entry.h>
33
34 #ifdef CONFIG_COLDFIRE_SW_A7
35 /*
36 * Define software copies of the supervis
37 */
38 .bss
39 sw_ksp:
40 .long 0
41 sw_usp:
42 .long 0
43 #endif /* CONFIG_COLDFIRE_SW_A7 */
44
45 .text
46
47 .globl system_call
48 .globl resume
49 .globl ret_from_exception
50 .globl sys_call_table
51 .globl inthandler
52
53 enosys:
54 mov.l #sys_ni_syscall,%d3
55 bra 1f
56
57 ENTRY(system_call)
58 SAVE_ALL_SYS
59 move #0x2000,%sr /* ena
60 GET_CURRENT(%d2)
61
62 cmpl #NR_syscalls,%d0
63 jcc enosys
64 lea sys_call_table,%a0
65 lsll #2,%d0 /* mov
66 movel %a0@(%d0),%d3
67 jeq enosys
68
69 1:
70 movel %sp,%d2 /* get
71 andl #-THREAD_SIZE,%d2 /* at
72 movel %d2,%a0
73 movel %a0@,%a1 /* sav
74 movel %sp,%a1@(TASK_THREAD+THREAD_ES
75 btst #(TIF_SYSCALL_TRACE%8),%a0@(TI
76 bnes 1f
77
78 movel %d3,%a0
79 jbsr %a0@
80 movel %d0,%sp@(PT_OFF_D0) /* sav
81 jra ret_from_exception
82 1:
83 movel #-ENOSYS,%d2 /* str
84 movel %d2,PT_OFF_D0(%sp) /* on
85 subql #4,%sp
86 SAVE_SWITCH_STACK
87 jbsr syscall_trace_enter
88 RESTORE_SWITCH_STACK
89 addql #4,%sp
90 addql #1,%d0
91 jeq ret_from_exception
92 movel %d3,%a0
93 jbsr %a0@
94 movel %d0,%sp@(PT_OFF_D0)
95 subql #4,%sp /* dum
96 SAVE_SWITCH_STACK
97 jbsr syscall_trace_leave
98 RESTORE_SWITCH_STACK
99 addql #4,%sp
100
101 ret_from_exception:
102 move #0x2700,%sr /* dis
103 btst #5,%sp@(PT_OFF_SR) /* che
104 jeq Luser_return /* if
105
106 #ifdef CONFIG_PREEMPTION
107 movel %sp,%d1 /* get
108 andl #-THREAD_SIZE,%d1 /* at
109 movel %d1,%a0
110 movel %a0@(TINFO_FLAGS),%d1 /* get
111 andl #(1<<TIF_NEED_RESCHED),%d1
112 jeq Lkernel_return
113
114 movel %a0@(TINFO_PREEMPT),%d1
115 cmpl #0,%d1
116 jne Lkernel_return
117
118 pea Lkernel_return
119 jmp preempt_schedule_irq /* pre
120 #endif
121
122 Lkernel_return:
123 moveml %sp@,%d1-%d5/%a0-%a2
124 lea %sp@(32),%sp /* spa
125 movel %sp@+,%d0
126 addql #4,%sp /* ori
127 addl %sp@+,%sp /* stk
128 rte
129
130 Luser_return:
131 movel %sp,%d1 /* get
132 andl #-THREAD_SIZE,%d1 /* at
133 movel %d1,%a0
134 moveb %a0@(TINFO_FLAGS+3),%d1 /* thr
135 jne Lwork_to_do /* sti
136
137 Lreturn:
138 RESTORE_USER
139
140 Lwork_to_do:
141 movel %a0@(TINFO_FLAGS),%d1 /* get
142 move #0x2000,%sr /* ena
143 btst #TIF_NEED_RESCHED,%d1
144 jne reschedule
145
146 Lsignal_return:
147 subql #4,%sp /* dum
148 SAVE_SWITCH_STACK
149 pea %sp@(SWITCH_STACK_SIZE)
150 jsr do_notify_resume
151 addql #4,%sp
152 RESTORE_SWITCH_STACK
153 addql #4,%sp
154 jmp Luser_return
155
156 /*
157 * This is the generic interrupt handler (for
158 * sources). Calls up to high level code to do
159 */
160 ENTRY(inthandler)
161 SAVE_ALL_INT
162 GET_CURRENT(%d2)
163
164 movew %sp@(PT_OFF_FORMATVEC),%d0 /*
165 andl #0x03fc,%d0 /* mas
166
167 movel %sp,%sp@- /* pus
168 lsrl #2,%d0 /* cal
169 movel %d0,%sp@- /* pus
170 jbsr do_IRQ /* cal
171 lea %sp@(8),%sp /* pop
172
173 bra ret_from_exception
174
175 /*
176 * Beware - when entering resume, prev (the cu
177 * in a0, next (the new task) is in a1, so don
178 * registers until their contents are no longe
179 */
180 ENTRY(resume)
181 movew %sr,%d1
182 movew %d1,%a0@(TASK_THREAD+THREAD_SR
183 movel %a0,%d1
184 SAVE_SWITCH_STACK
185 movel %sp,%a0@(TASK_THREAD+THREAD_KS
186 RDUSP
187 movel %a3,%a0@(TASK_THREAD+THREAD_US
188 #ifdef CONFIG_MMU
189 movel %a1,%a2
190 #endif
191 movel %a1@(TASK_THREAD+THREAD_USP),%
192 WRUSP
193 movel %a1@(TASK_THREAD+THREAD_KSP),%
194 movew %a1@(TASK_THREAD+THREAD_SR),%d
195 movew %d7,%sr
196 RESTORE_SWITCH_STACK
197 rts
198
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