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1/* SPDX-License-Identifier: GPL-2.0-or-later
2 *
3 * entry.S -- interrupt and exception processing for ColdFire
4 *
5 * Copyright (C) 1999-2007, Greg Ungerer (gerg@snapgear.com)
6 * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
7 * Kenneth Albanowski <kjahds@kjahds.com>,
8 * Copyright (C) 2000 Lineo Inc. (www.lineo.com)
9 * Copyright (C) 2004-2006 Macq Electronique SA. (www.macqel.com)
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@snapgear.com)
21 * 5307 fixes by David W. Miller
22 * linux 2.4 support David McCullough <davidm@snapgear.com>
23 * Bug, speed and maintainability fixes by Philippe De Muyter <phdm@macqel.be>
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 supervisor and user stack pointers.
37 */
38.bss
39sw_ksp:
40.long 0
41sw_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
53enosys:
54 mov.l #sys_ni_syscall,%d3
55 bra 1f
56
57ENTRY(system_call)
58 SAVE_ALL_SYS
59 move #0x2000,%sr /* enable intrs again */
60 GET_CURRENT(%d2)
61
62 cmpl #NR_syscalls,%d0
63 jcc enosys
64 lea sys_call_table,%a0
65 lsll #2,%d0 /* movel %a0@(%d0:l:4),%d3 */
66 movel %a0@(%d0),%d3
67 jeq enosys
68
691:
70 movel %sp,%d2 /* get thread_info pointer */
71 andl #-THREAD_SIZE,%d2 /* at start of kernel stack */
72 movel %d2,%a0
73 movel %a0@,%a1 /* save top of frame */
74 movel %sp,%a1@(TASK_THREAD+THREAD_ESP0)
75 btst #(TIF_SYSCALL_TRACE%8),%a0@(TINFO_FLAGS+(31-TIF_SYSCALL_TRACE)/8)
76 bnes 1f
77
78 movel %d3,%a0
79 jbsr %a0@
80 movel %d0,%sp@(PT_OFF_D0) /* save the return value */
81 jra ret_from_exception
821:
83 movel #-ENOSYS,%d2 /* strace needs -ENOSYS in PT_OFF_D0 */
84 movel %d2,PT_OFF_D0(%sp) /* on syscall entry */
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) /* save the return value */
95 subql #4,%sp /* dummy return address */
96 SAVE_SWITCH_STACK
97 jbsr syscall_trace_leave
98 RESTORE_SWITCH_STACK
99 addql #4,%sp
100
101ret_from_exception:
102 move #0x2700,%sr /* disable intrs */
103 btst #5,%sp@(PT_OFF_SR) /* check if returning to kernel */
104 jeq Luser_return /* if so, skip resched, signals */
105
106#ifdef CONFIG_PREEMPTION
107 movel %sp,%d1 /* get thread_info pointer */
108 andl #-THREAD_SIZE,%d1 /* at base of kernel stack */
109 movel %d1,%a0
110 movel %a0@(TINFO_FLAGS),%d1 /* get thread_info->flags */
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 /* preempt the kernel */
120#endif
121
122Lkernel_return:
123 moveml %sp@,%d1-%d5/%a0-%a2
124 lea %sp@(32),%sp /* space for 8 regs */
125 movel %sp@+,%d0
126 addql #4,%sp /* orig d0 */
127 addl %sp@+,%sp /* stk adj */
128 rte
129
130Luser_return:
131 movel %sp,%d1 /* get thread_info pointer */
132 andl #-THREAD_SIZE,%d1 /* at base of kernel stack */
133 movel %d1,%a0
134 moveb %a0@(TINFO_FLAGS+3),%d1 /* thread_info->flags (low 8 bits) */
135 jne Lwork_to_do /* still work to do */
136
137Lreturn:
138 RESTORE_USER
139
140Lwork_to_do:
141 movel %a0@(TINFO_FLAGS),%d1 /* get thread_info->flags */
142 move #0x2000,%sr /* enable intrs again */
143 btst #TIF_NEED_RESCHED,%d1
144 jne reschedule
145
146Lsignal_return:
147 subql #4,%sp /* dummy return address */
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 all hardware interrupt
158 * sources). Calls up to high level code to do all the work.
159 */
160ENTRY(inthandler)
161 SAVE_ALL_INT
162 GET_CURRENT(%d2)
163
164 movew %sp@(PT_OFF_FORMATVEC),%d0 /* put exception # in d0 */
165 andl #0x03fc,%d0 /* mask out vector only */
166
167 movel %sp,%sp@- /* push regs arg */
168 lsrl #2,%d0 /* calculate real vector # */
169 movel %d0,%sp@- /* push vector number */
170 jbsr do_IRQ /* call high level irq handler */
171 lea %sp@(8),%sp /* pop args off stack */
172
173 bra ret_from_exception
174
175/*
176 * Beware - when entering resume, prev (the current task) is
177 * in a0, next (the new task) is in a1, so don't change these
178 * registers until their contents are no longer needed.
179 */
180ENTRY(resume)
181 movew %sr,%d1 /* save current status */
182 movew %d1,%a0@(TASK_THREAD+THREAD_SR)
183 movel %a0,%d1 /* get prev thread in d1 */
184 SAVE_SWITCH_STACK
185 movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack pointer */
186 RDUSP /* movel %usp,%a3 */
187 movel %a3,%a0@(TASK_THREAD+THREAD_USP) /* save thread user stack */
188#ifdef CONFIG_MMU
189 movel %a1,%a2 /* set new current */
190#endif
191 movel %a1@(TASK_THREAD+THREAD_USP),%a3 /* restore thread user stack */
192 WRUSP /* movel %a3,%usp */
193 movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new kernel stack */
194 movew %a1@(TASK_THREAD+THREAD_SR),%d7 /* restore new status */
195 movew %d7,%sr
196 RESTORE_SWITCH_STACK
197 rts
198
1/*
2 * entry.S -- interrupt and exception processing for ColdFire
3 *
4 * Copyright (C) 1999-2007, 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 * Copyright (C) 2004-2006 Macq Electronique SA. (www.macqel.com)
9 *
10 * Based on:
11 *
12 * linux/arch/m68k/kernel/entry.S
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 *
16 * This file is subject to the terms and conditions of the GNU General Public
17 * License. See the file README.legal in the main directory of this archive
18 * for more details.
19 *
20 * Linux/m68k support by Hamish Macdonald
21 *
22 * 68060 fixes by Jesper Skov
23 * ColdFire support by Greg Ungerer (gerg@snapgear.com)
24 * 5307 fixes by David W. Miller
25 * linux 2.4 support David McCullough <davidm@snapgear.com>
26 * Bug, speed and maintainability fixes by Philippe De Muyter <phdm@macqel.be>
27 */
28
29#include <linux/linkage.h>
30#include <asm/unistd.h>
31#include <asm/thread_info.h>
32#include <asm/errno.h>
33#include <asm/setup.h>
34#include <asm/asm-offsets.h>
35#include <asm/entry.h>
36
37#ifdef CONFIG_COLDFIRE_SW_A7
38/*
39 * Define software copies of the supervisor and user stack pointers.
40 */
41.bss
42sw_ksp:
43.long 0
44sw_usp:
45.long 0
46#endif /* CONFIG_COLDFIRE_SW_A7 */
47
48.text
49
50.globl system_call
51.globl resume
52.globl ret_from_exception
53.globl sys_call_table
54.globl inthandler
55
56enosys:
57 mov.l #sys_ni_syscall,%d3
58 bra 1f
59
60ENTRY(system_call)
61 SAVE_ALL_SYS
62 move #0x2000,%sr /* enable intrs again */
63 GET_CURRENT(%d2)
64
65 cmpl #NR_syscalls,%d0
66 jcc enosys
67 lea sys_call_table,%a0
68 lsll #2,%d0 /* movel %a0@(%d0:l:4),%d3 */
69 movel %a0@(%d0),%d3
70 jeq enosys
71
721:
73 movel %sp,%d2 /* get thread_info pointer */
74 andl #-THREAD_SIZE,%d2 /* at start of kernel stack */
75 movel %d2,%a0
76 movel %a0@,%a1 /* save top of frame */
77 movel %sp,%a1@(TASK_THREAD+THREAD_ESP0)
78 btst #(TIF_SYSCALL_TRACE%8),%a0@(TINFO_FLAGS+(31-TIF_SYSCALL_TRACE)/8)
79 bnes 1f
80
81 movel %d3,%a0
82 jbsr %a0@
83 movel %d0,%sp@(PT_OFF_D0) /* save the return value */
84 jra ret_from_exception
851:
86 movel #-ENOSYS,%d2 /* strace needs -ENOSYS in PT_OFF_D0 */
87 movel %d2,PT_OFF_D0(%sp) /* on syscall entry */
88 subql #4,%sp
89 SAVE_SWITCH_STACK
90 jbsr syscall_trace_enter
91 RESTORE_SWITCH_STACK
92 addql #4,%sp
93 movel %d3,%a0
94 jbsr %a0@
95 movel %d0,%sp@(PT_OFF_D0) /* save the return value */
96 subql #4,%sp /* dummy return address */
97 SAVE_SWITCH_STACK
98 jbsr syscall_trace_leave
99 RESTORE_SWITCH_STACK
100 addql #4,%sp
101
102ret_from_exception:
103 move #0x2700,%sr /* disable intrs */
104 btst #5,%sp@(PT_OFF_SR) /* check if returning to kernel */
105 jeq Luser_return /* if so, skip resched, signals */
106
107#ifdef CONFIG_PREEMPTION
108 movel %sp,%d1 /* get thread_info pointer */
109 andl #-THREAD_SIZE,%d1 /* at base of kernel stack */
110 movel %d1,%a0
111 movel %a0@(TINFO_FLAGS),%d1 /* get thread_info->flags */
112 andl #(1<<TIF_NEED_RESCHED),%d1
113 jeq Lkernel_return
114
115 movel %a0@(TINFO_PREEMPT),%d1
116 cmpl #0,%d1
117 jne Lkernel_return
118
119 pea Lkernel_return
120 jmp preempt_schedule_irq /* preempt the kernel */
121#endif
122
123Lkernel_return:
124 moveml %sp@,%d1-%d5/%a0-%a2
125 lea %sp@(32),%sp /* space for 8 regs */
126 movel %sp@+,%d0
127 addql #4,%sp /* orig d0 */
128 addl %sp@+,%sp /* stk adj */
129 rte
130
131Luser_return:
132 movel %sp,%d1 /* get thread_info pointer */
133 andl #-THREAD_SIZE,%d1 /* at base of kernel stack */
134 movel %d1,%a0
135 moveb %a0@(TINFO_FLAGS+3),%d1 /* thread_info->flags (low 8 bits) */
136 jne Lwork_to_do /* still work to do */
137
138Lreturn:
139 RESTORE_USER
140
141Lwork_to_do:
142 movel %a0@(TINFO_FLAGS),%d1 /* get thread_info->flags */
143 move #0x2000,%sr /* enable intrs again */
144 btst #TIF_NEED_RESCHED,%d1
145 jne reschedule
146
147Lsignal_return:
148 subql #4,%sp /* dummy return address */
149 SAVE_SWITCH_STACK
150 pea %sp@(SWITCH_STACK_SIZE)
151 jsr do_notify_resume
152 addql #4,%sp
153 RESTORE_SWITCH_STACK
154 addql #4,%sp
155 jmp Luser_return
156
157/*
158 * This is the generic interrupt handler (for all hardware interrupt
159 * sources). Calls up to high level code to do all the work.
160 */
161ENTRY(inthandler)
162 SAVE_ALL_INT
163 GET_CURRENT(%d2)
164
165 movew %sp@(PT_OFF_FORMATVEC),%d0 /* put exception # in d0 */
166 andl #0x03fc,%d0 /* mask out vector only */
167
168 movel %sp,%sp@- /* push regs arg */
169 lsrl #2,%d0 /* calculate real vector # */
170 movel %d0,%sp@- /* push vector number */
171 jbsr do_IRQ /* call high level irq handler */
172 lea %sp@(8),%sp /* pop args off stack */
173
174 bra ret_from_exception
175
176/*
177 * Beware - when entering resume, prev (the current task) is
178 * in a0, next (the new task) is in a1, so don't change these
179 * registers until their contents are no longer needed.
180 */
181ENTRY(resume)
182 movew %sr,%d1 /* save current status */
183 movew %d1,%a0@(TASK_THREAD+THREAD_SR)
184 movel %a0,%d1 /* get prev thread in d1 */
185 SAVE_SWITCH_STACK
186 movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack pointer */
187 RDUSP /* movel %usp,%a3 */
188 movel %a3,%a0@(TASK_THREAD+THREAD_USP) /* save thread user stack */
189#ifdef CONFIG_MMU
190 movel %a1,%a2 /* set new current */
191#endif
192 movel %a1@(TASK_THREAD+THREAD_USP),%a3 /* restore thread user stack */
193 WRUSP /* movel %a3,%usp */
194 movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new kernel stack */
195 movew %a1@(TASK_THREAD+THREAD_SR),%d7 /* restore new status */
196 movew %d7,%sr
197 RESTORE_SWITCH_STACK
198 rts
199