1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
/*
* arch/sh/kernel/cpu/sh2a/entry.S
*
* The SH-2A exception entry
*
* Copyright (C) 2008 Yoshinori Sato
* Based on arch/sh/kernel/cpu/sh2/entry.S
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/linkage.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
#include <cpu/mmu_context.h>
#include <asm/unistd.h>
#include <asm/errno.h>
#include <asm/page.h>
/* Offsets to the stack */
OFF_R0 = 0 /* Return value. New ABI also arg4 */
OFF_R1 = 4 /* New ABI: arg5 */
OFF_R2 = 8 /* New ABI: arg6 */
OFF_R3 = 12 /* New ABI: syscall_nr */
OFF_R4 = 16 /* New ABI: arg0 */
OFF_R5 = 20 /* New ABI: arg1 */
OFF_R6 = 24 /* New ABI: arg2 */
OFF_R7 = 28 /* New ABI: arg3 */
OFF_SP = (15*4)
OFF_PC = (16*4)
OFF_SR = (16*4+2*4)
OFF_TRA = (16*4+6*4)
#include <asm/entry-macros.S>
ENTRY(exception_handler)
! stack
! r0 <- point sp
! r1
! pc
! sr
! r0 = temporary
! r1 = vector (pseudo EXPEVT / INTEVT / TRA)
mov.l r2,@-sp
cli
mov.l $cpu_mode,r2
bld.b #6,@(0,r2) !previus SR.MD
bst.b #6,@(4*4,r15) !set cpu mode to SR.MD
bt 1f
! switch to kernel mode
bset.b #6,@(0,r2) !set SR.MD
mov.l $current_thread_info,r2
mov.l @r2,r2
mov #(THREAD_SIZE >> 8),r0
shll8 r0
add r2,r0 ! r0 = kernel stack tail
mov r15,r2 ! r2 = user stack top
mov r0,r15 ! switch kernel stack
mov.l r1,@-r15 ! TRA
sts.l macl, @-r15
sts.l mach, @-r15
stc.l gbr, @-r15
mov.l @(4*4,r2),r0
mov.l r0,@-r15 ! original SR
sts.l pr,@-r15
mov.l @(3*4,r2),r0
mov.l r0,@-r15 ! original PC
mov r2,r0
add #(3+2)*4,r0 ! rewind r0 - r3 + exception frame
lds r0,pr ! pr = original SP
movmu.l r3,@-r15 ! save regs
mov r2,r8 ! r8 = previus stack top
mov r1,r9 ! r9 = interrupt vector
! restore previous stack
mov.l @r8+,r2
mov.l @r8+,r0
mov.l @r8+,r1
bra 2f
movml.l r2,@-r15
1:
! in kernel exception
mov r15,r2
add #-((OFF_TRA + 4) - OFF_PC) + 5*4,r15
movmu.l r3,@-r15
mov r2,r8 ! r8 = previous stack top
mov r1,r9 ! r9 = interrupt vector
! restore exception frame & regs
mov.l @r8+,r2 ! old R2
mov.l @r8+,r0 ! old R0
mov.l @r8+,r1 ! old R1
mov.l @r8+,r10 ! old PC
mov.l @r8+,r11 ! old SR
movml.l r2,@-r15
mov.l r10,@(OFF_PC,r15)
mov.l r11,@(OFF_SR,r15)
mov.l r8,@(OFF_SP,r15) ! save old sp
mov r15,r8
add #OFF_TRA + 4,r8
mov.l r9,@-r8
sts.l macl,@-r8
sts.l mach,@-r8
stc.l gbr,@-r8
add #-4,r8
sts.l pr,@-r8
2:
! dispatch exception / interrupt
mov #64,r8
cmp/hs r8,r9
bt interrupt_entry ! vec >= 64 is interrupt
mov #31,r8
cmp/hs r8,r9
bt trap_entry ! 64 > vec >= 31 is trap
mov.l 4f,r8
mov r9,r4
shll2 r9
add r9,r8
mov.l @r8,r8 ! exception handler address
tst r8,r8
bf 3f
mov.l 8f,r8 ! unhandled exception
3:
mov.l 5f,r10
jmp @r8
lds r10,pr
interrupt_entry:
mov r9,r4
mov r15,r5
mov.l 7f,r8
mov.l 6f,r9
jmp @r8
lds r9,pr
.align 2
4: .long exception_handling_table
5: .long ret_from_exception
6: .long ret_from_irq
7: .long do_IRQ
8: .long exception_error
trap_entry:
mov #0x30,r8
cmp/ge r8,r9 ! vector 0x1f-0x2f is systemcall
bt 1f
mov #0x1f,r9 ! convert to unified SH2/3/4 trap number
1:
shll2 r9 ! TRA
bra system_call ! jump common systemcall entry
mov r9,r8
#if defined(CONFIG_SH_STANDARD_BIOS)
/* Unwind the stack and jmp to the debug entry */
ENTRY(sh_bios_handler)
mov r15,r0
add #(22-4)*4-4,r0
ldc.l @r0+,gbr
lds.l @r0+,mach
lds.l @r0+,macl
mov r15,r0
mov.l @(OFF_SP,r0),r1
mov.l @(OFF_SR,r2),r3
mov.l r3,@-r1
mov.l @(OFF_SP,r2),r3
mov.l r3,@-r1
mov r15,r0
add #(22-4)*4-8,r0
mov.l 1f,r2
mov.l @r2,r2
stc sr,r3
mov.l r2,@r0
mov.l r3,@(4,r0)
mov.l r1,@(8,r0)
movml.l @r15+,r14
add #8,r15
lds.l @r15+, pr
mov.l @r15+,r15
rte
nop
.align 2
1: .long gdb_vbr_vector
#endif /* CONFIG_SH_STANDARD_BIOS */
ENTRY(address_error_trap_handler)
mov r15,r4 ! regs
mov.l @(OFF_PC,r15),r6 ! pc
mov.l 1f,r0
jmp @r0
mov #0,r5 ! writeaccess is unknown
.align 2
1: .long do_address_error
restore_all:
stc sr,r0
or #0xf0,r0
ldc r0,sr ! all interrupt block (same BL = 1)
! restore special register
! overlap exception frame
mov r15,r0
add #17*4,r0
lds.l @r0+,pr
add #4,r0
ldc.l @r0+,gbr
lds.l @r0+,mach
lds.l @r0+,macl
mov r15,r0
mov.l $cpu_mode,r2
bld.b #6,@(OFF_SR,r15)
bst.b #6,@(0,r2) ! save CPU mode
mov.l @(OFF_SR,r0),r1
shll2 r1
shlr2 r1 ! clear MD bit
mov.l @(OFF_SP,r0),r2
add #-8,r2
mov.l r2,@(OFF_SP,r0) ! point exception frame top
mov.l r1,@(4,r2) ! set sr
mov.l @(OFF_PC,r0),r1
mov.l r1,@r2 ! set pc
get_current_thread_info r0, r1
mov.l $current_thread_info,r1
mov.l r0,@r1
movml.l @r15+,r14
mov.l @r15,r15
rte
nop
.align 2
$current_thread_info:
.long __current_thread_info
$cpu_mode:
.long __cpu_mode
! common exception handler
#include "../../entry-common.S"
.data
! cpu operation mode
! bit30 = MD (compatible SH3/4)
__cpu_mode:
.long 0x40000000
.section .bss
__current_thread_info:
.long 0
ENTRY(exception_handling_table)
.space 4*32
|
