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Linux 2.6.31.6
[linux/fpc-iii.git] / arch / mn10300 / mm / misalignment.c
blob30016251f658507ec5a6501c35028dd74be22716
1 /* MN10300 Misalignment fixup handler
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11 #include <linux/module.h>
12 #include <linux/sched.h>
13 #include <linux/kernel.h>
14 #include <linux/string.h>
15 #include <linux/errno.h>
16 #include <linux/ptrace.h>
17 #include <linux/timer.h>
18 #include <linux/mm.h>
19 #include <linux/smp.h>
20 #include <linux/init.h>
21 #include <linux/delay.h>
22 #include <linux/spinlock.h>
23 #include <linux/interrupt.h>
24 #include <linux/pci.h>
25 #include <asm/processor.h>
26 #include <asm/system.h>
27 #include <asm/uaccess.h>
28 #include <asm/io.h>
29 #include <asm/atomic.h>
30 #include <asm/smp.h>
31 #include <asm/pgalloc.h>
32 #include <asm/cpu-regs.h>
33 #include <asm/busctl-regs.h>
34 #include <asm/fpu.h>
35 #include <asm/gdb-stub.h>
36 #include <asm/asm-offsets.h>
37
38 #if 0
39 #define kdebug(FMT, ...) printk(KERN_DEBUG "MISALIGN: "FMT"\n", ##__VA_ARGS__)
40 #else
41 #define kdebug(FMT, ...) do {} while (0)
42 #endif
43
44 static int misalignment_addr(unsigned long *registers, unsigned long sp,
45 unsigned params, unsigned opcode,
46 unsigned long disp,
47 void **_address, unsigned long **_postinc,
48 unsigned long *_inc);
49
50 static int misalignment_reg(unsigned long *registers, unsigned params,
51 unsigned opcode, unsigned long disp,
52 unsigned long **_register);
53
54 static void misalignment_MOV_Lcc(struct pt_regs *regs, uint32_t opcode);
55
56 static const unsigned Dreg_index[] = {
57 REG_D0 >> 2, REG_D1 >> 2, REG_D2 >> 2, REG_D3 >> 2
58 };
59
60 static const unsigned Areg_index[] = {
61 REG_A0 >> 2, REG_A1 >> 2, REG_A2 >> 2, REG_A3 >> 2
62 };
63
64 static const unsigned Rreg_index[] = {
65 REG_E0 >> 2, REG_E1 >> 2, REG_E2 >> 2, REG_E3 >> 2,
66 REG_E4 >> 2, REG_E5 >> 2, REG_E6 >> 2, REG_E7 >> 2,
67 REG_A0 >> 2, REG_A1 >> 2, REG_A2 >> 2, REG_A3 >> 2,
68 REG_D0 >> 2, REG_D1 >> 2, REG_D2 >> 2, REG_D3 >> 2
69 };
70
71 enum format_id {
72 FMT_S0,
73 FMT_S1,
74 FMT_S2,
75 FMT_S4,
76 FMT_D0,
77 FMT_D1,
78 FMT_D2,
79 FMT_D4,
80 FMT_D6,
81 FMT_D7,
82 FMT_D8,
83 FMT_D9,
84 FMT_D10,
85 };
86
87 static const struct {
88 u_int8_t opsz, dispsz;
89 } format_tbl[16] = {
90 [FMT_S0] = { 8, 0 },
91 [FMT_S1] = { 8, 8 },
92 [FMT_S2] = { 8, 16 },
93 [FMT_S4] = { 8, 32 },
94 [FMT_D0] = { 16, 0 },
95 [FMT_D1] = { 16, 8 },
96 [FMT_D2] = { 16, 16 },
97 [FMT_D4] = { 16, 32 },
98 [FMT_D6] = { 24, 0 },
99 [FMT_D7] = { 24, 8 },
100 [FMT_D8] = { 24, 24 },
101 [FMT_D9] = { 24, 32 },
102 [FMT_D10] = { 32, 0 },
103 };
104
105 enum value_id {
106 DM0, /* data reg in opcode in bits 0-1 */
107 DM1, /* data reg in opcode in bits 2-3 */
108 DM2, /* data reg in opcode in bits 4-5 */
109 AM0, /* addr reg in opcode in bits 0-1 */
110 AM1, /* addr reg in opcode in bits 2-3 */
111 AM2, /* addr reg in opcode in bits 4-5 */
112 RM0, /* reg in opcode in bits 0-3 */
113 RM1, /* reg in opcode in bits 2-5 */
114 RM2, /* reg in opcode in bits 4-7 */
115 RM4, /* reg in opcode in bits 8-11 */
116 RM6, /* reg in opcode in bits 12-15 */
117
118 RD0, /* reg in displacement in bits 0-3 */
119 RD2, /* reg in displacement in bits 4-7 */
120
121 SP, /* stack pointer */
122
123 SD8, /* 8-bit signed displacement */
124 SD16, /* 16-bit signed displacement */
125 SD24, /* 24-bit signed displacement */
126 SIMM4_2, /* 4-bit signed displacement in opcode bits 4-7 */
127 SIMM8, /* 8-bit signed immediate */
128 IMM8, /* 8-bit unsigned immediate */
129 IMM16, /* 16-bit unsigned immediate */
130 IMM24, /* 24-bit unsigned immediate */
131 IMM32, /* 32-bit unsigned immediate */
132 IMM32_HIGH8, /* 32-bit unsigned immediate, LSB in opcode */
133
134 IMM32_MEM, /* 32-bit unsigned displacement */
135 IMM32_HIGH8_MEM, /* 32-bit unsigned displacement, LSB in opcode */
136
137 DN0 = DM0,
138 DN1 = DM1,
139 DN2 = DM2,
140 AN0 = AM0,
141 AN1 = AM1,
142 AN2 = AM2,
143 RN0 = RM0,
144 RN1 = RM1,
145 RN2 = RM2,
146 RN4 = RM4,
147 RN6 = RM6,
148 DI = DM1,
149 RI = RM2,
150
151 };
152
153 struct mn10300_opcode {
154 const char name[8];
155 u_int32_t opcode;
156 u_int32_t opmask;
157 unsigned exclusion;
158
159 enum format_id format;
160
161 unsigned cpu_mask;
162 #define AM33 330
163
164 unsigned params[2];
165 #define MEM(ADDR) (0x80000000 | (ADDR))
166 #define MEM2(ADDR1, ADDR2) (0x80000000 | (ADDR1) << 8 | (ADDR2))
167 #define MEMINC(ADDR) (0x81000000 | (ADDR))
168 #define MEMINC2(ADDR, INC) (0x81000000 | (ADDR) << 8 | (INC))
169 };
170
171 /* LIBOPCODES EXCERPT
172 Assemble Matsushita MN10300 instructions.
173 Copyright 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
174
175 This program is free software; you can redistribute it and/or modify
176 it under the terms of the GNU General Public Licence as published by
177 the Free Software Foundation; either version 2 of the Licence, or
178 (at your option) any later version.
179
180 This program is distributed in the hope that it will be useful,
181 but WITHOUT ANY WARRANTY; without even the implied warranty of
182 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
183 GNU General Public Licence for more details.
184
185 You should have received a copy of the GNU General Public Licence
186 along with this program; if not, write to the Free Software
187 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
188 */
189 static const struct mn10300_opcode mn10300_opcodes[] = {
190 { "mov", 0x4200, 0xf300, 0, FMT_S1, 0, {DM1, MEM2(IMM8, SP)}},
191 { "mov", 0x4300, 0xf300, 0, FMT_S1, 0, {AM1, MEM2(IMM8, SP)}},
192 { "mov", 0x5800, 0xfc00, 0, FMT_S1, 0, {MEM2(IMM8, SP), DN0}},
193 { "mov", 0x5c00, 0xfc00, 0, FMT_S1, 0, {MEM2(IMM8, SP), AN0}},
194 { "mov", 0x60, 0xf0, 0, FMT_S0, 0, {DM1, MEM(AN0)}},
195 { "mov", 0x70, 0xf0, 0, FMT_S0, 0, {MEM(AM0), DN1}},
196 { "mov", 0xf000, 0xfff0, 0, FMT_D0, 0, {MEM(AM0), AN1}},
197 { "mov", 0xf010, 0xfff0, 0, FMT_D0, 0, {AM1, MEM(AN0)}},
198 { "mov", 0xf300, 0xffc0, 0, FMT_D0, 0, {MEM2(DI, AM0), DN2}},
199 { "mov", 0xf340, 0xffc0, 0, FMT_D0, 0, {DM2, MEM2(DI, AN0)}},
200 { "mov", 0xf380, 0xffc0, 0, FMT_D0, 0, {MEM2(DI, AM0), AN2}},
201 { "mov", 0xf3c0, 0xffc0, 0, FMT_D0, 0, {AM2, MEM2(DI, AN0)}},
202 { "mov", 0xf80000, 0xfff000, 0, FMT_D1, 0, {MEM2(SD8, AM0), DN1}},
203 { "mov", 0xf81000, 0xfff000, 0, FMT_D1, 0, {DM1, MEM2(SD8, AN0)}},
204 { "mov", 0xf82000, 0xfff000, 0, FMT_D1, 0, {MEM2(SD8,AM0), AN1}},
205 { "mov", 0xf83000, 0xfff000, 0, FMT_D1, 0, {AM1, MEM2(SD8, AN0)}},
206 { "mov", 0xf90a00, 0xffff00, 0, FMT_D6, AM33, {MEM(RM0), RN2}},
207 { "mov", 0xf91a00, 0xffff00, 0, FMT_D6, AM33, {RM2, MEM(RN0)}},
208 { "mov", 0xf96a00, 0xffff00, 0x12, FMT_D6, AM33, {MEMINC(RM0), RN2}},
209 { "mov", 0xf97a00, 0xffff00, 0, FMT_D6, AM33, {RM2, MEMINC(RN0)}},
210 { "mov", 0xfa000000, 0xfff00000, 0, FMT_D2, 0, {MEM2(SD16, AM0), DN1}},
211 { "mov", 0xfa100000, 0xfff00000, 0, FMT_D2, 0, {DM1, MEM2(SD16, AN0)}},
212 { "mov", 0xfa200000, 0xfff00000, 0, FMT_D2, 0, {MEM2(SD16, AM0), AN1}},
213 { "mov", 0xfa300000, 0xfff00000, 0, FMT_D2, 0, {AM1, MEM2(SD16, AN0)}},
214 { "mov", 0xfa900000, 0xfff30000, 0, FMT_D2, 0, {AM1, MEM2(IMM16, SP)}},
215 { "mov", 0xfa910000, 0xfff30000, 0, FMT_D2, 0, {DM1, MEM2(IMM16, SP)}},
216 { "mov", 0xfab00000, 0xfffc0000, 0, FMT_D2, 0, {MEM2(IMM16, SP), AN0}},
217 { "mov", 0xfab40000, 0xfffc0000, 0, FMT_D2, 0, {MEM2(IMM16, SP), DN0}},
218 { "mov", 0xfb0a0000, 0xffff0000, 0, FMT_D7, AM33, {MEM2(SD8, RM0), RN2}},
219 { "mov", 0xfb1a0000, 0xffff0000, 0, FMT_D7, AM33, {RM2, MEM2(SD8, RN0)}},
220 { "mov", 0xfb6a0000, 0xffff0000, 0x22, FMT_D7, AM33, {MEMINC2 (RM0, SIMM8), RN2}},
221 { "mov", 0xfb7a0000, 0xffff0000, 0, FMT_D7, AM33, {RM2, MEMINC2 (RN0, SIMM8)}},
222 { "mov", 0xfb8a0000, 0xffff0f00, 0, FMT_D7, AM33, {MEM2(IMM8, SP), RN2}},
223 { "mov", 0xfb8e0000, 0xffff000f, 0, FMT_D7, AM33, {MEM2(RI, RM0), RD2}},
224 { "mov", 0xfb9a0000, 0xffff0f00, 0, FMT_D7, AM33, {RM2, MEM2(IMM8, SP)}},
225 { "mov", 0xfb9e0000, 0xffff000f, 0, FMT_D7, AM33, {RD2, MEM2(RI, RN0)}},
226 { "mov", 0xfc000000, 0xfff00000, 0, FMT_D4, 0, {MEM2(IMM32,AM0), DN1}},
227 { "mov", 0xfc100000, 0xfff00000, 0, FMT_D4, 0, {DM1, MEM2(IMM32,AN0)}},
228 { "mov", 0xfc200000, 0xfff00000, 0, FMT_D4, 0, {MEM2(IMM32,AM0), AN1}},
229 { "mov", 0xfc300000, 0xfff00000, 0, FMT_D4, 0, {AM1, MEM2(IMM32,AN0)}},
230 { "mov", 0xfc800000, 0xfff30000, 0, FMT_D4, 0, {AM1, MEM(IMM32_MEM)}},
231 { "mov", 0xfc810000, 0xfff30000, 0, FMT_D4, 0, {DM1, MEM(IMM32_MEM)}},
232 { "mov", 0xfc900000, 0xfff30000, 0, FMT_D4, 0, {AM1, MEM2(IMM32, SP)}},
233 { "mov", 0xfc910000, 0xfff30000, 0, FMT_D4, 0, {DM1, MEM2(IMM32, SP)}},
234 { "mov", 0xfca00000, 0xfffc0000, 0, FMT_D4, 0, {MEM(IMM32_MEM), AN0}},
235 { "mov", 0xfca40000, 0xfffc0000, 0, FMT_D4, 0, {MEM(IMM32_MEM), DN0}},
236 { "mov", 0xfcb00000, 0xfffc0000, 0, FMT_D4, 0, {MEM2(IMM32, SP), AN0}},
237 { "mov", 0xfcb40000, 0xfffc0000, 0, FMT_D4, 0, {MEM2(IMM32, SP), DN0}},
238 { "mov", 0xfd0a0000, 0xffff0000, 0, FMT_D8, AM33, {MEM2(SD24, RM0), RN2}},
239 { "mov", 0xfd1a0000, 0xffff0000, 0, FMT_D8, AM33, {RM2, MEM2(SD24, RN0)}},
240 { "mov", 0xfd6a0000, 0xffff0000, 0x22, FMT_D8, AM33, {MEMINC2 (RM0, IMM24), RN2}},
241 { "mov", 0xfd7a0000, 0xffff0000, 0, FMT_D8, AM33, {RM2, MEMINC2 (RN0, IMM24)}},
242 { "mov", 0xfd8a0000, 0xffff0f00, 0, FMT_D8, AM33, {MEM2(IMM24, SP), RN2}},
243 { "mov", 0xfd9a0000, 0xffff0f00, 0, FMT_D8, AM33, {RM2, MEM2(IMM24, SP)}},
244 { "mov", 0xfe0a0000, 0xffff0000, 0, FMT_D9, AM33, {MEM2(IMM32_HIGH8,RM0), RN2}},
245 { "mov", 0xfe0a0000, 0xffff0000, 0, FMT_D9, AM33, {MEM2(IMM32_HIGH8,RM0), RN2}},
246 { "mov", 0xfe0e0000, 0xffff0f00, 0, FMT_D9, AM33, {MEM(IMM32_HIGH8_MEM), RN2}},
247 { "mov", 0xfe1a0000, 0xffff0000, 0, FMT_D9, AM33, {RM2, MEM2(IMM32_HIGH8, RN0)}},
248 { "mov", 0xfe1a0000, 0xffff0000, 0, FMT_D9, AM33, {RM2, MEM2(IMM32_HIGH8, RN0)}},
249 { "mov", 0xfe1e0000, 0xffff0f00, 0, FMT_D9, AM33, {RM2, MEM(IMM32_HIGH8_MEM)}},
250 { "mov", 0xfe6a0000, 0xffff0000, 0x22, FMT_D9, AM33, {MEMINC2 (RM0, IMM32_HIGH8), RN2}},
251 { "mov", 0xfe7a0000, 0xffff0000, 0, FMT_D9, AM33, {RN2, MEMINC2 (RM0, IMM32_HIGH8)}},
252 { "mov", 0xfe8a0000, 0xffff0f00, 0, FMT_D9, AM33, {MEM2(IMM32_HIGH8, SP), RN2}},
253 { "mov", 0xfe9a0000, 0xffff0f00, 0, FMT_D9, AM33, {RM2, MEM2(IMM32_HIGH8, SP)}},
254
255 { "movhu", 0xf060, 0xfff0, 0, FMT_D0, 0, {MEM(AM0), DN1}},
256 { "movhu", 0xf070, 0xfff0, 0, FMT_D0, 0, {DM1, MEM(AN0)}},
257 { "movhu", 0xf480, 0xffc0, 0, FMT_D0, 0, {MEM2(DI, AM0), DN2}},
258 { "movhu", 0xf4c0, 0xffc0, 0, FMT_D0, 0, {DM2, MEM2(DI, AN0)}},
259 { "movhu", 0xf86000, 0xfff000, 0, FMT_D1, 0, {MEM2(SD8, AM0), DN1}},
260 { "movhu", 0xf87000, 0xfff000, 0, FMT_D1, 0, {DM1, MEM2(SD8, AN0)}},
261 { "movhu", 0xf89300, 0xfff300, 0, FMT_D1, 0, {DM1, MEM2(IMM8, SP)}},
262 { "movhu", 0xf8bc00, 0xfffc00, 0, FMT_D1, 0, {MEM2(IMM8, SP), DN0}},
263 { "movhu", 0xf94a00, 0xffff00, 0, FMT_D6, AM33, {MEM(RM0), RN2}},
264 { "movhu", 0xf95a00, 0xffff00, 0, FMT_D6, AM33, {RM2, MEM(RN0)}},
265 { "movhu", 0xf9ea00, 0xffff00, 0x12, FMT_D6, AM33, {MEMINC(RM0), RN2}},
266 { "movhu", 0xf9fa00, 0xffff00, 0, FMT_D6, AM33, {RM2, MEMINC(RN0)}},
267 { "movhu", 0xfa600000, 0xfff00000, 0, FMT_D2, 0, {MEM2(SD16, AM0), DN1}},
268 { "movhu", 0xfa700000, 0xfff00000, 0, FMT_D2, 0, {DM1, MEM2(SD16, AN0)}},
269 { "movhu", 0xfa930000, 0xfff30000, 0, FMT_D2, 0, {DM1, MEM2(IMM16, SP)}},
270 { "movhu", 0xfabc0000, 0xfffc0000, 0, FMT_D2, 0, {MEM2(IMM16, SP), DN0}},
271 { "movhu", 0xfb4a0000, 0xffff0000, 0, FMT_D7, AM33, {MEM2(SD8, RM0), RN2}},
272 { "movhu", 0xfb5a0000, 0xffff0000, 0, FMT_D7, AM33, {RM2, MEM2(SD8, RN0)}},
273 { "movhu", 0xfbca0000, 0xffff0f00, 0, FMT_D7, AM33, {MEM2(IMM8, SP), RN2}},
274 { "movhu", 0xfbce0000, 0xffff000f, 0, FMT_D7, AM33, {MEM2(RI, RM0), RD2}},
275 { "movhu", 0xfbda0000, 0xffff0f00, 0, FMT_D7, AM33, {RM2, MEM2(IMM8, SP)}},
276 { "movhu", 0xfbde0000, 0xffff000f, 0, FMT_D7, AM33, {RD2, MEM2(RI, RN0)}},
277 { "movhu", 0xfbea0000, 0xffff0000, 0x22, FMT_D7, AM33, {MEMINC2 (RM0, SIMM8), RN2}},
278 { "movhu", 0xfbfa0000, 0xffff0000, 0, FMT_D7, AM33, {RM2, MEMINC2 (RN0, SIMM8)}},
279 { "movhu", 0xfc600000, 0xfff00000, 0, FMT_D4, 0, {MEM2(IMM32,AM0), DN1}},
280 { "movhu", 0xfc700000, 0xfff00000, 0, FMT_D4, 0, {DM1, MEM2(IMM32,AN0)}},
281 { "movhu", 0xfc830000, 0xfff30000, 0, FMT_D4, 0, {DM1, MEM(IMM32_MEM)}},
282 { "movhu", 0xfc930000, 0xfff30000, 0, FMT_D4, 0, {DM1, MEM2(IMM32, SP)}},
283 { "movhu", 0xfcac0000, 0xfffc0000, 0, FMT_D4, 0, {MEM(IMM32_MEM), DN0}},
284 { "movhu", 0xfcbc0000, 0xfffc0000, 0, FMT_D4, 0, {MEM2(IMM32, SP), DN0}},
285 { "movhu", 0xfd4a0000, 0xffff0000, 0, FMT_D8, AM33, {MEM2(SD24, RM0), RN2}},
286 { "movhu", 0xfd5a0000, 0xffff0000, 0, FMT_D8, AM33, {RM2, MEM2(SD24, RN0)}},
287 { "movhu", 0xfdca0000, 0xffff0f00, 0, FMT_D8, AM33, {MEM2(IMM24, SP), RN2}},
288 { "movhu", 0xfdda0000, 0xffff0f00, 0, FMT_D8, AM33, {RM2, MEM2(IMM24, SP)}},
289 { "movhu", 0xfdea0000, 0xffff0000, 0x22, FMT_D8, AM33, {MEMINC2 (RM0, IMM24), RN2}},
290 { "movhu", 0xfdfa0000, 0xffff0000, 0, FMT_D8, AM33, {RM2, MEMINC2 (RN0, IMM24)}},
291 { "movhu", 0xfe4a0000, 0xffff0000, 0, FMT_D9, AM33, {MEM2(IMM32_HIGH8,RM0), RN2}},
292 { "movhu", 0xfe4e0000, 0xffff0f00, 0, FMT_D9, AM33, {MEM(IMM32_HIGH8_MEM), RN2}},
293 { "movhu", 0xfe5a0000, 0xffff0000, 0, FMT_D9, AM33, {RM2, MEM2(IMM32_HIGH8, RN0)}},
294 { "movhu", 0xfe5e0000, 0xffff0f00, 0, FMT_D9, AM33, {RM2, MEM(IMM32_HIGH8_MEM)}},
295 { "movhu", 0xfeca0000, 0xffff0f00, 0, FMT_D9, AM33, {MEM2(IMM32_HIGH8, SP), RN2}},
296 { "movhu", 0xfeda0000, 0xffff0f00, 0, FMT_D9, AM33, {RM2, MEM2(IMM32_HIGH8, SP)}},
297 { "movhu", 0xfeea0000, 0xffff0000, 0x22, FMT_D9, AM33, {MEMINC2 (RM0, IMM32_HIGH8), RN2}},
298 { "movhu", 0xfefa0000, 0xffff0000, 0, FMT_D9, AM33, {RN2, MEMINC2 (RM0, IMM32_HIGH8)}},
299
300 { "mov_llt", 0xf7e00000, 0xffff000f, 0x22, FMT_D10, AM33, {MEMINC2 (RN4,SIMM4_2), RM6}},
301 { "mov_lgt", 0xf7e00001, 0xffff000f, 0x22, FMT_D10, AM33, {MEMINC2 (RN4,SIMM4_2), RM6}},
302 { "mov_lge", 0xf7e00002, 0xffff000f, 0x22, FMT_D10, AM33, {MEMINC2 (RN4,SIMM4_2), RM6}},
303 { "mov_lle", 0xf7e00003, 0xffff000f, 0x22, FMT_D10, AM33, {MEMINC2 (RN4,SIMM4_2), RM6}},
304 { "mov_lcs", 0xf7e00004, 0xffff000f, 0x22, FMT_D10, AM33, {MEMINC2 (RN4,SIMM4_2), RM6}},
305 { "mov_lhi", 0xf7e00005, 0xffff000f, 0x22, FMT_D10, AM33, {MEMINC2 (RN4,SIMM4_2), RM6}},
306 { "mov_lcc", 0xf7e00006, 0xffff000f, 0x22, FMT_D10, AM33, {MEMINC2 (RN4,SIMM4_2), RM6}},
307 { "mov_lls", 0xf7e00007, 0xffff000f, 0x22, FMT_D10, AM33, {MEMINC2 (RN4,SIMM4_2), RM6}},
308 { "mov_leq", 0xf7e00008, 0xffff000f, 0x22, FMT_D10, AM33, {MEMINC2 (RN4,SIMM4_2), RM6}},
309 { "mov_lne", 0xf7e00009, 0xffff000f, 0x22, FMT_D10, AM33, {MEMINC2 (RN4,SIMM4_2), RM6}},
310 { "mov_lra", 0xf7e0000a, 0xffff000f, 0x22, FMT_D10, AM33, {MEMINC2 (RN4,SIMM4_2), RM6}},
311
312 { "", 0, 0, 0, 0, 0, {0}},
313 };
314
315 /*
316 * fix up misalignment problems where possible
317 */
318 asmlinkage void misalignment(struct pt_regs *regs, enum exception_code code)
319 {
320 const struct exception_table_entry *fixup;
321 const struct mn10300_opcode *pop;
322 unsigned long *registers = (unsigned long *) regs;
323 unsigned long data, *store, *postinc, disp, inc, sp;
324 mm_segment_t seg;
325 siginfo_t info;
326 uint32_t opcode, noc, xo, xm;
327 uint8_t *pc, byte, datasz;
328 void *address;
329 unsigned tmp, npop, dispsz, loop;
330
331 /* we don't fix up userspace misalignment faults */
332 if (user_mode(regs))
333 goto bus_error;
334
335 sp = (unsigned long) regs + sizeof(*regs);
336
337 kdebug("==>misalignment({pc=%lx,sp=%lx})", regs->pc, sp);
338
339 if (regs->epsw & EPSW_IE)
340 asm volatile("or %0,epsw" : : "i"(EPSW_IE));
341
342 seg = get_fs();
343 set_fs(KERNEL_DS);
344
345 fixup = search_exception_tables(regs->pc);
346
347 /* first thing to do is to match the opcode */
348 pc = (u_int8_t *) regs->pc;
349
350 if (__get_user(byte, pc) != 0)
351 goto fetch_error;
352 opcode = byte;
353 noc = 8;
354
355 for (pop = mn10300_opcodes; pop->name[0]; pop++) {
356 npop = ilog2(pop->opcode | pop->opmask);
357 if (npop <= 0 || npop > 31)
358 continue;
359 npop = (npop + 8) & ~7;
360
361 got_more_bits:
362 if (npop == noc) {
363 if ((opcode & pop->opmask) == pop->opcode)
364 goto found_opcode;
365 } else if (npop > noc) {
366 xo = pop->opcode >> (npop - noc);
367 xm = pop->opmask >> (npop - noc);
368
369 if ((opcode & xm) != xo)
370 continue;
371
372 /* we've got a partial match (an exact match on the
373 * first N bytes), so we need to get some more data */
374 pc++;
375 if (__get_user(byte, pc) != 0)
376 goto fetch_error;
377 opcode = opcode << 8 | byte;
378 noc += 8;
379 goto got_more_bits;
380 } else {
381 /* there's already been a partial match as long as the
382 * complete match we're now considering, so this one
383 * should't match */
384 continue;
385 }
386 }
387
388 /* didn't manage to find a fixup */
389 printk(KERN_CRIT "MISALIGN: %lx: unsupported instruction %x\n",
390 regs->pc, opcode);
391
392 failed:
393 set_fs(seg);
394 if (die_if_no_fixup("misalignment error", regs, code))
395 return;
396
397 bus_error:
398 info.si_signo = SIGBUS;
399 info.si_errno = 0;
400 info.si_code = BUS_ADRALN;
401 info.si_addr = (void *) regs->pc;
402 force_sig_info(SIGBUS, &info, current);
403 return;
404
405 /* error reading opcodes */
406 fetch_error:
407 printk(KERN_CRIT
408 "MISALIGN: %p: fault whilst reading instruction data\n",
409 pc);
410 goto failed;
411
412 bad_addr_mode:
413 printk(KERN_CRIT
414 "MISALIGN: %lx: unsupported addressing mode %x\n",
415 regs->pc, opcode);
416 goto failed;
417
418 bad_reg_mode:
419 printk(KERN_CRIT
420 "MISALIGN: %lx: unsupported register mode %x\n",
421 regs->pc, opcode);
422 goto failed;
423
424 unsupported_instruction:
425 printk(KERN_CRIT
426 "MISALIGN: %lx: unsupported instruction %x (%s)\n",
427 regs->pc, opcode, pop->name);
428 goto failed;
429
430 transfer_failed:
431 set_fs(seg);
432 if (fixup) {
433 regs->pc = fixup->fixup;
434 return;
435 }
436 if (die_if_no_fixup("misalignment fixup", regs, code))
437 return;
438
439 info.si_signo = SIGSEGV;
440 info.si_errno = 0;
441 info.si_code = 0;
442 info.si_addr = (void *) regs->pc;
443 force_sig_info(SIGSEGV, &info, current);
444 return;
445
446 /* we matched the opcode */
447 found_opcode:
448 kdebug("%lx: %x==%x { %x, %x }",
449 regs->pc, opcode, pop->opcode, pop->params[0], pop->params[1]);
450
451 tmp = format_tbl[pop->format].opsz;
452 if (tmp > noc)
453 BUG(); /* match was less complete than it ought to have been */
454
455 if (tmp < noc) {
456 tmp = noc - tmp;
457 opcode >>= tmp;
458 pc -= tmp >> 3;
459 }
460
461 /* grab the extra displacement (note it's LSB first) */
462 disp = 0;
463 dispsz = format_tbl[pop->format].dispsz;
464 for (loop = 0; loop < dispsz; loop += 8) {
465 pc++;
466 if (__get_user(byte, pc) != 0)
467 goto fetch_error;
468 disp |= byte << loop;
469 kdebug("{%p} disp[%02x]=%02x", pc, loop, byte);
470 }
471
472 kdebug("disp=%lx", disp);
473
474 set_fs(KERNEL_XDS);
475 if (fixup)
476 set_fs(seg);
477
478 tmp = (pop->params[0] ^ pop->params[1]) & 0x80000000;
479 if (!tmp) {
480 printk(KERN_CRIT
481 "MISALIGN: %lx: insn not move to/from memory %x\n",
482 regs->pc, opcode);
483 goto failed;
484 }
485
486 /* determine the data transfer size of the move */
487 if (pop->name[3] == 0 || /* "mov" */
488 pop->name[4] == 'l') /* mov_lcc */
489 inc = datasz = 4;
490 else if (pop->name[3] == 'h') /* movhu */
491 inc = datasz = 2;
492 else
493 goto unsupported_instruction;
494
495 if (pop->params[0] & 0x80000000) {
496 /* move memory to register */
497 if (!misalignment_addr(registers, sp,
498 pop->params[0], opcode, disp,
499 &address, &postinc, &inc))
500 goto bad_addr_mode;
501
502 if (!misalignment_reg(registers, pop->params[1], opcode, disp,
503 &store))
504 goto bad_reg_mode;
505
506 kdebug("mov%u (%p),DARn", datasz, address);
507 if (copy_from_user(&data, (void *) address, datasz) != 0)
508 goto transfer_failed;
509 if (pop->params[0] & 0x1000000) {
510 kdebug("inc=%lx", inc);
511 *postinc += inc;
512 }
513
514 *store = data;
515 kdebug("loaded %lx", data);
516 } else {
517 /* move register to memory */
518 if (!misalignment_reg(registers, pop->params[0], opcode, disp,
519 &store))
520 goto bad_reg_mode;
521
522 if (!misalignment_addr(registers, sp,
523 pop->params[1], opcode, disp,
524 &address, &postinc, &inc))
525 goto bad_addr_mode;
526
527 data = *store;
528
529 kdebug("mov%u %lx,(%p)", datasz, data, address);
530 if (copy_to_user((void *) address, &data, datasz) != 0)
531 goto transfer_failed;
532 if (pop->params[1] & 0x1000000)
533 *postinc += inc;
534 }
535
536 tmp = format_tbl[pop->format].opsz + format_tbl[pop->format].dispsz;
537 regs->pc += tmp >> 3;
538
539 /* handle MOV_Lcc, which are currently the only FMT_D10 insns that
540 * access memory */
541 if (pop->format == FMT_D10)
542 misalignment_MOV_Lcc(regs, opcode);
543
544 set_fs(seg);
545 }
546
547 /*
548 * determine the address that was being accessed
549 */
550 static int misalignment_addr(unsigned long *registers, unsigned long sp,
551 unsigned params, unsigned opcode,
552 unsigned long disp,
553 void **_address, unsigned long **_postinc,
554 unsigned long *_inc)
555 {
556 unsigned long *postinc = NULL, address = 0, tmp;
557
558 if (!(params & 0x1000000)) {
559 kdebug("noinc");
560 *_inc = 0;
561 _inc = NULL;
562 }
563
564 params &= 0x00ffffff;
565
566 do {
567 switch (params & 0xff) {
568 case DM0:
569 postinc = &registers[Dreg_index[opcode & 0x03]];
570 address += *postinc;
571 break;
572 case DM1:
573 postinc = &registers[Dreg_index[opcode >> 2 & 0x03]];
574 address += *postinc;
575 break;
576 case DM2:
577 postinc = &registers[Dreg_index[opcode >> 4 & 0x03]];
578 address += *postinc;
579 break;
580 case AM0:
581 postinc = &registers[Areg_index[opcode & 0x03]];
582 address += *postinc;
583 break;
584 case AM1:
585 postinc = &registers[Areg_index[opcode >> 2 & 0x03]];
586 address += *postinc;
587 break;
588 case AM2:
589 postinc = &registers[Areg_index[opcode >> 4 & 0x03]];
590 address += *postinc;
591 break;
592 case RM0:
593 postinc = &registers[Rreg_index[opcode & 0x0f]];
594 address += *postinc;
595 break;
596 case RM1:
597 postinc = &registers[Rreg_index[opcode >> 2 & 0x0f]];
598 address += *postinc;
599 break;
600 case RM2:
601 postinc = &registers[Rreg_index[opcode >> 4 & 0x0f]];
602 address += *postinc;
603 break;
604 case RM4:
605 postinc = &registers[Rreg_index[opcode >> 8 & 0x0f]];
606 address += *postinc;
607 break;
608 case RM6:
609 postinc = &registers[Rreg_index[opcode >> 12 & 0x0f]];
610 address += *postinc;
611 break;
612 case RD0:
613 postinc = &registers[Rreg_index[disp & 0x0f]];
614 address += *postinc;
615 break;
616 case RD2:
617 postinc = &registers[Rreg_index[disp >> 4 & 0x0f]];
618 address += *postinc;
619 break;
620 case SP:
621 address += sp;
622 break;
623
624 /* displacements are either to be added to the address
625 * before use, or, in the case of post-inc addressing,
626 * to be added into the base register after use */
627 case SD8:
628 case SIMM8:
629 disp = (long) (int8_t) (disp & 0xff);
630 goto displace_or_inc;
631 case SD16:
632 disp = (long) (int16_t) (disp & 0xffff);
633 goto displace_or_inc;
634 case SD24:
635 tmp = disp << 8;
636 asm("asr 8,%0" : "=r"(tmp) : "0"(tmp));
637 disp = (long) tmp;
638 goto displace_or_inc;
639 case SIMM4_2:
640 tmp = opcode >> 4 & 0x0f;
641 tmp <<= 28;
642 asm("asr 28,%0" : "=r"(tmp) : "0"(tmp));
643 disp = (long) tmp;
644 goto displace_or_inc;
645 case IMM8:
646 disp &= 0x000000ff;
647 goto displace_or_inc;
648 case IMM16:
649 disp &= 0x0000ffff;
650 goto displace_or_inc;
651 case IMM24:
652 disp &= 0x00ffffff;
653 goto displace_or_inc;
654 case IMM32:
655 case IMM32_MEM:
656 case IMM32_HIGH8:
657 case IMM32_HIGH8_MEM:
658 displace_or_inc:
659 kdebug("%s %lx", _inc ? "incr" : "disp", disp);
660 if (!_inc)
661 address += disp;
662 else
663 *_inc = disp;
664 break;
665 default:
666 BUG();
667 return 0;
668 }
669 } while ((params >>= 8));
670
671 *_address = (void *) address;
672 *_postinc = postinc;
673 return 1;
674 }
675
676 /*
677 * determine the register that is acting as source/dest
678 */
679 static int misalignment_reg(unsigned long *registers, unsigned params,
680 unsigned opcode, unsigned long disp,
681 unsigned long **_register)
682 {
683 params &= 0x7fffffff;
684
685 if (params & 0xffffff00)
686 return 0;
687
688 switch (params & 0xff) {
689 case DM0:
690 *_register = &registers[Dreg_index[opcode & 0x03]];
691 break;
692 case DM1:
693 *_register = &registers[Dreg_index[opcode >> 2 & 0x03]];
694 break;
695 case DM2:
696 *_register = &registers[Dreg_index[opcode >> 4 & 0x03]];
697 break;
698 case AM0:
699 *_register = &registers[Areg_index[opcode & 0x03]];
700 break;
701 case AM1:
702 *_register = &registers[Areg_index[opcode >> 2 & 0x03]];
703 break;
704 case AM2:
705 *_register = &registers[Areg_index[opcode >> 4 & 0x03]];
706 break;
707 case RM0:
708 *_register = &registers[Rreg_index[opcode & 0x0f]];
709 break;
710 case RM1:
711 *_register = &registers[Rreg_index[opcode >> 2 & 0x0f]];
712 break;
713 case RM2:
714 *_register = &registers[Rreg_index[opcode >> 4 & 0x0f]];
715 break;
716 case RM4:
717 *_register = &registers[Rreg_index[opcode >> 8 & 0x0f]];
718 break;
719 case RM6:
720 *_register = &registers[Rreg_index[opcode >> 12 & 0x0f]];
721 break;
722 case RD0:
723 *_register = &registers[Rreg_index[disp & 0x0f]];
724 break;
725 case RD2:
726 *_register = &registers[Rreg_index[disp >> 4 & 0x0f]];
727 break;
728 case SP:
729 *_register = &registers[REG_SP >> 2];
730 break;
731
732 default:
733 BUG();
734 return 0;
735 }
736
737 return 1;
738 }
739
740 /*
741 * handle the conditional loop part of the move-and-loop instructions
742 */
743 static void misalignment_MOV_Lcc(struct pt_regs *regs, uint32_t opcode)
744 {
745 unsigned long epsw = regs->epsw;
746 unsigned long NxorV;
747
748 kdebug("MOV_Lcc %x [flags=%lx]", opcode, epsw & 0xf);
749
750 /* calculate N^V and shift onto the same bit position as Z */
751 NxorV = ((epsw >> 3) ^ epsw >> 1) & 1;
752
753 switch (opcode & 0xf) {
754 case 0x0: /* MOV_LLT: N^V */
755 if (NxorV)
756 goto take_the_loop;
757 return;
758 case 0x1: /* MOV_LGT: ~(Z or (N^V))*/
759 if (!((epsw & EPSW_FLAG_Z) | NxorV))
760 goto take_the_loop;
761 return;
762 case 0x2: /* MOV_LGE: ~(N^V) */
763 if (!NxorV)
764 goto take_the_loop;
765 return;
766 case 0x3: /* MOV_LLE: Z or (N^V) */
767 if ((epsw & EPSW_FLAG_Z) | NxorV)
768 goto take_the_loop;
769 return;
770
771 case 0x4: /* MOV_LCS: C */
772 if (epsw & EPSW_FLAG_C)
773 goto take_the_loop;
774 return;
775 case 0x5: /* MOV_LHI: ~(C or Z) */
776 if (!(epsw & (EPSW_FLAG_C | EPSW_FLAG_Z)))
777 goto take_the_loop;
778 return;
779 case 0x6: /* MOV_LCC: ~C */
780 if (!(epsw & EPSW_FLAG_C))
781 goto take_the_loop;
782 return;
783 case 0x7: /* MOV_LLS: C or Z */
784 if (epsw & (EPSW_FLAG_C | EPSW_FLAG_Z))
785 goto take_the_loop;
786 return;
787
788 case 0x8: /* MOV_LEQ: Z */
789 if (epsw & EPSW_FLAG_Z)
790 goto take_the_loop;
791 return;
792 case 0x9: /* MOV_LNE: ~Z */
793 if (!(epsw & EPSW_FLAG_Z))
794 goto take_the_loop;
795 return;
796 case 0xa: /* MOV_LRA: always */
797 goto take_the_loop;
798
799 default:
800 BUG();
801 }
802
803 take_the_loop:
804 /* wind the PC back to just after the SETLB insn */
805 kdebug("loop LAR=%lx", regs->lar);
806 regs->pc = regs->lar - 4;
807 }
808
809 /*
810 * misalignment handler tests
811 */
812 #ifdef CONFIG_TEST_MISALIGNMENT_HANDLER
813 static u8 __initdata testbuf[512] __attribute__((aligned(16))) = {
814 [257] = 0x11,
815 [258] = 0x22,
816 [259] = 0x33,
817 [260] = 0x44,
818 };
819
820 #define ASSERTCMP(X, OP, Y) \
821 do { \
822 if (unlikely(!((X) OP (Y)))) { \
823 printk(KERN_ERR "\n"); \
824 printk(KERN_ERR "MISALIGN: Assertion failed at line %u\n", \
825 __LINE__); \
826 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
827 (unsigned long)(X), (unsigned long)(Y)); \
828 BUG(); \
829 } \
830 } while(0)
831
832 static int __init test_misalignment(void)
833 {
834 register void *r asm("e0");
835 register u32 y asm("e1");
836 void *p = testbuf, *q;
837 u32 tmp, tmp2, x;
838
839 printk(KERN_NOTICE "==>test_misalignment() [testbuf=%p]\n", p);
840 p++;
841
842 printk(KERN_NOTICE "___ MOV (Am),Dn ___\n");
843 q = p + 256;
844 asm volatile("mov (%0),%1" : "+a"(q), "=d"(x));
845 ASSERTCMP(q, ==, p + 256);
846 ASSERTCMP(x, ==, 0x44332211);
847
848 printk(KERN_NOTICE "___ MOV (256,Am),Dn ___\n");
849 q = p;
850 asm volatile("mov (256,%0),%1" : "+a"(q), "=d"(x));
851 ASSERTCMP(q, ==, p);
852 ASSERTCMP(x, ==, 0x44332211);
853
854 printk(KERN_NOTICE "___ MOV (Di,Am),Dn ___\n");
855 tmp = 256;
856 q = p;
857 asm volatile("mov (%2,%0),%1" : "+a"(q), "=d"(x), "+d"(tmp));
858 ASSERTCMP(q, ==, p);
859 ASSERTCMP(x, ==, 0x44332211);
860 ASSERTCMP(tmp, ==, 256);
861
862 printk(KERN_NOTICE "___ MOV (256,Rm),Rn ___\n");
863 r = p;
864 asm volatile("mov (256,%0),%1" : "+r"(r), "=r"(y));
865 ASSERTCMP(r, ==, p);
866 ASSERTCMP(y, ==, 0x44332211);
867
868 printk(KERN_NOTICE "___ MOV (Rm+),Rn ___\n");
869 r = p + 256;
870 asm volatile("mov (%0+),%1" : "+r"(r), "=r"(y));
871 ASSERTCMP(r, ==, p + 256 + 4);
872 ASSERTCMP(y, ==, 0x44332211);
873
874 printk(KERN_NOTICE "___ MOV (Rm+,8),Rn ___\n");
875 r = p + 256;
876 asm volatile("mov (%0+,8),%1" : "+r"(r), "=r"(y));
877 ASSERTCMP(r, ==, p + 256 + 8);
878 ASSERTCMP(y, ==, 0x44332211);
879
880 printk(KERN_NOTICE "___ MOV (7,SP),Rn ___\n");
881 asm volatile(
882 "add -16,sp \n"
883 "mov +0x11,%0 \n"
884 "movbu %0,(7,sp) \n"
885 "mov +0x22,%0 \n"
886 "movbu %0,(8,sp) \n"
887 "mov +0x33,%0 \n"
888 "movbu %0,(9,sp) \n"
889 "mov +0x44,%0 \n"
890 "movbu %0,(10,sp) \n"
891 "mov (7,sp),%1 \n"
892 "add +16,sp \n"
893 : "+a"(q), "=d"(x));
894 ASSERTCMP(x, ==, 0x44332211);
895
896 printk(KERN_NOTICE "___ MOV (259,SP),Rn ___\n");
897 asm volatile(
898 "add -264,sp \n"
899 "mov +0x11,%0 \n"
900 "movbu %0,(259,sp) \n"
901 "mov +0x22,%0 \n"
902 "movbu %0,(260,sp) \n"
903 "mov +0x33,%0 \n"
904 "movbu %0,(261,sp) \n"
905 "mov +0x55,%0 \n"
906 "movbu %0,(262,sp) \n"
907 "mov (259,sp),%1 \n"
908 "add +264,sp \n"
909 : "+d"(tmp), "=d"(x));
910 ASSERTCMP(x, ==, 0x55332211);
911
912 printk(KERN_NOTICE "___ MOV (260,SP),Rn ___\n");
913 asm volatile(
914 "add -264,sp \n"
915 "mov +0x11,%0 \n"
916 "movbu %0,(260,sp) \n"
917 "mov +0x22,%0 \n"
918 "movbu %0,(261,sp) \n"
919 "mov +0x33,%0 \n"
920 "movbu %0,(262,sp) \n"
921 "mov +0x55,%0 \n"
922 "movbu %0,(263,sp) \n"
923 "mov (260,sp),%1 \n"
924 "add +264,sp \n"
925 : "+d"(tmp), "=d"(x));
926 ASSERTCMP(x, ==, 0x55332211);
927
928
929 printk(KERN_NOTICE "___ MOV_LNE ___\n");
930 tmp = 1;
931 tmp2 = 2;
932 q = p + 256;
933 asm volatile(
934 "setlb \n"
935 "mov %2,%3 \n"
936 "mov %1,%2 \n"
937 "cmp +0,%1 \n"
938 "mov_lne (%0+,4),%1"
939 : "+r"(q), "+d"(tmp), "+d"(tmp2), "=d"(x)
940 :
941 : "cc");
942 ASSERTCMP(q, ==, p + 256 + 12);
943 ASSERTCMP(x, ==, 0x44332211);
944
945 printk(KERN_NOTICE "___ MOV in SETLB ___\n");
946 tmp = 1;
947 tmp2 = 2;
948 q = p + 256;
949 asm volatile(
950 "setlb \n"
951 "mov %1,%3 \n"
952 "mov (%0+),%1 \n"
953 "cmp +0,%1 \n"
954 "lne "
955 : "+a"(q), "+d"(tmp), "+d"(tmp2), "=d"(x)
956 :
957 : "cc");
958
959 ASSERTCMP(q, ==, p + 256 + 8);
960 ASSERTCMP(x, ==, 0x44332211);
961
962 printk(KERN_NOTICE "<==test_misalignment()\n");
963 return 0;
964 }
965
966 arch_initcall(test_misalignment);
967
968 #endif /* CONFIG_TEST_MISALIGNMENT_HANDLER */
Linux with added FPC-III support