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1da177e4 | 1 | /* |
5a4f7c66 | 2 | * arch/sh/kernel/process_64.c |
1da177e4 | 3 | * |
5a4f7c66 | 4 | * This file handles the architecture-dependent parts of process handling.. |
1da177e4 LT |
5 | * |
6 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
5a4f7c66 | 7 | * Copyright (C) 2003 - 2007 Paul Mundt |
1da177e4 LT |
8 | * Copyright (C) 2003, 2004 Richard Curnow |
9 | * | |
10 | * Started from SH3/4 version: | |
11 | * Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima | |
12 | * | |
13 | * In turn started from i386 version: | |
14 | * Copyright (C) 1995 Linus Torvalds | |
15 | * | |
5a4f7c66 PM |
16 | * This file is subject to the terms and conditions of the GNU General Public |
17 | * License. See the file "COPYING" in the main directory of this archive | |
18 | * for more details. | |
1da177e4 | 19 | */ |
1da177e4 | 20 | #include <linux/mm.h> |
78d98277 | 21 | #include <linux/fs.h> |
1da177e4 | 22 | #include <linux/ptrace.h> |
1da177e4 | 23 | #include <linux/reboot.h> |
5a0e3ad6 | 24 | #include <linux/slab.h> |
1da177e4 | 25 | #include <linux/init.h> |
821278a7 | 26 | #include <linux/module.h> |
a7aa92d1 | 27 | #include <linux/io.h> |
b17b0153 | 28 | #include <linux/sched/debug.h> |
29930025 | 29 | #include <linux/sched/task.h> |
68db0cf1 | 30 | #include <linux/sched/task_stack.h> |
fa43972f | 31 | #include <asm/syscalls.h> |
7c0f6ba6 | 32 | #include <linux/uaccess.h> |
1da177e4 | 33 | #include <asm/pgtable.h> |
df0fb256 | 34 | #include <asm/mmu_context.h> |
50387b3e | 35 | #include <asm/fpu.h> |
e839ca52 | 36 | #include <asm/switch_to.h> |
1da177e4 LT |
37 | |
38 | struct task_struct *last_task_used_math = NULL; | |
3a9485da | 39 | struct pt_regs fake_swapper_regs = { 0, }; |
1da177e4 | 40 | |
fbb82b03 | 41 | void show_regs(struct pt_regs *regs) |
1da177e4 LT |
42 | { |
43 | unsigned long long ah, al, bh, bl, ch, cl; | |
44 | ||
45 | printk("\n"); | |
a43cb95d | 46 | show_regs_print_info(KERN_DEFAULT); |
1da177e4 LT |
47 | |
48 | ah = (regs->pc) >> 32; | |
49 | al = (regs->pc) & 0xffffffff; | |
50 | bh = (regs->regs[18]) >> 32; | |
51 | bl = (regs->regs[18]) & 0xffffffff; | |
52 | ch = (regs->regs[15]) >> 32; | |
53 | cl = (regs->regs[15]) & 0xffffffff; | |
54 | printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n", | |
55 | ah, al, bh, bl, ch, cl); | |
56 | ||
57 | ah = (regs->sr) >> 32; | |
58 | al = (regs->sr) & 0xffffffff; | |
59 | asm volatile ("getcon " __TEA ", %0" : "=r" (bh)); | |
60 | asm volatile ("getcon " __TEA ", %0" : "=r" (bl)); | |
61 | bh = (bh) >> 32; | |
62 | bl = (bl) & 0xffffffff; | |
63 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (ch)); | |
64 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (cl)); | |
65 | ch = (ch) >> 32; | |
66 | cl = (cl) & 0xffffffff; | |
67 | printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n", | |
68 | ah, al, bh, bl, ch, cl); | |
69 | ||
70 | ah = (regs->regs[0]) >> 32; | |
71 | al = (regs->regs[0]) & 0xffffffff; | |
72 | bh = (regs->regs[1]) >> 32; | |
73 | bl = (regs->regs[1]) & 0xffffffff; | |
74 | ch = (regs->regs[2]) >> 32; | |
75 | cl = (regs->regs[2]) & 0xffffffff; | |
76 | printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n", | |
77 | ah, al, bh, bl, ch, cl); | |
78 | ||
79 | ah = (regs->regs[3]) >> 32; | |
80 | al = (regs->regs[3]) & 0xffffffff; | |
81 | bh = (regs->regs[4]) >> 32; | |
82 | bl = (regs->regs[4]) & 0xffffffff; | |
83 | ch = (regs->regs[5]) >> 32; | |
84 | cl = (regs->regs[5]) & 0xffffffff; | |
85 | printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n", | |
86 | ah, al, bh, bl, ch, cl); | |
87 | ||
88 | ah = (regs->regs[6]) >> 32; | |
89 | al = (regs->regs[6]) & 0xffffffff; | |
90 | bh = (regs->regs[7]) >> 32; | |
91 | bl = (regs->regs[7]) & 0xffffffff; | |
92 | ch = (regs->regs[8]) >> 32; | |
93 | cl = (regs->regs[8]) & 0xffffffff; | |
94 | printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n", | |
95 | ah, al, bh, bl, ch, cl); | |
96 | ||
97 | ah = (regs->regs[9]) >> 32; | |
98 | al = (regs->regs[9]) & 0xffffffff; | |
99 | bh = (regs->regs[10]) >> 32; | |
100 | bl = (regs->regs[10]) & 0xffffffff; | |
101 | ch = (regs->regs[11]) >> 32; | |
102 | cl = (regs->regs[11]) & 0xffffffff; | |
103 | printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n", | |
104 | ah, al, bh, bl, ch, cl); | |
105 | ||
106 | ah = (regs->regs[12]) >> 32; | |
107 | al = (regs->regs[12]) & 0xffffffff; | |
108 | bh = (regs->regs[13]) >> 32; | |
109 | bl = (regs->regs[13]) & 0xffffffff; | |
110 | ch = (regs->regs[14]) >> 32; | |
111 | cl = (regs->regs[14]) & 0xffffffff; | |
112 | printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n", | |
113 | ah, al, bh, bl, ch, cl); | |
114 | ||
115 | ah = (regs->regs[16]) >> 32; | |
116 | al = (regs->regs[16]) & 0xffffffff; | |
117 | bh = (regs->regs[17]) >> 32; | |
118 | bl = (regs->regs[17]) & 0xffffffff; | |
119 | ch = (regs->regs[19]) >> 32; | |
120 | cl = (regs->regs[19]) & 0xffffffff; | |
121 | printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n", | |
122 | ah, al, bh, bl, ch, cl); | |
123 | ||
124 | ah = (regs->regs[20]) >> 32; | |
125 | al = (regs->regs[20]) & 0xffffffff; | |
126 | bh = (regs->regs[21]) >> 32; | |
127 | bl = (regs->regs[21]) & 0xffffffff; | |
128 | ch = (regs->regs[22]) >> 32; | |
129 | cl = (regs->regs[22]) & 0xffffffff; | |
130 | printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n", | |
131 | ah, al, bh, bl, ch, cl); | |
132 | ||
133 | ah = (regs->regs[23]) >> 32; | |
134 | al = (regs->regs[23]) & 0xffffffff; | |
135 | bh = (regs->regs[24]) >> 32; | |
136 | bl = (regs->regs[24]) & 0xffffffff; | |
137 | ch = (regs->regs[25]) >> 32; | |
138 | cl = (regs->regs[25]) & 0xffffffff; | |
139 | printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n", | |
140 | ah, al, bh, bl, ch, cl); | |
141 | ||
142 | ah = (regs->regs[26]) >> 32; | |
143 | al = (regs->regs[26]) & 0xffffffff; | |
144 | bh = (regs->regs[27]) >> 32; | |
145 | bl = (regs->regs[27]) & 0xffffffff; | |
146 | ch = (regs->regs[28]) >> 32; | |
147 | cl = (regs->regs[28]) & 0xffffffff; | |
148 | printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n", | |
149 | ah, al, bh, bl, ch, cl); | |
150 | ||
151 | ah = (regs->regs[29]) >> 32; | |
152 | al = (regs->regs[29]) & 0xffffffff; | |
153 | bh = (regs->regs[30]) >> 32; | |
154 | bl = (regs->regs[30]) & 0xffffffff; | |
155 | ch = (regs->regs[31]) >> 32; | |
156 | cl = (regs->regs[31]) & 0xffffffff; | |
157 | printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n", | |
158 | ah, al, bh, bl, ch, cl); | |
159 | ||
160 | ah = (regs->regs[32]) >> 32; | |
161 | al = (regs->regs[32]) & 0xffffffff; | |
162 | bh = (regs->regs[33]) >> 32; | |
163 | bl = (regs->regs[33]) & 0xffffffff; | |
164 | ch = (regs->regs[34]) >> 32; | |
165 | cl = (regs->regs[34]) & 0xffffffff; | |
166 | printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n", | |
167 | ah, al, bh, bl, ch, cl); | |
168 | ||
169 | ah = (regs->regs[35]) >> 32; | |
170 | al = (regs->regs[35]) & 0xffffffff; | |
171 | bh = (regs->regs[36]) >> 32; | |
172 | bl = (regs->regs[36]) & 0xffffffff; | |
173 | ch = (regs->regs[37]) >> 32; | |
174 | cl = (regs->regs[37]) & 0xffffffff; | |
175 | printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n", | |
176 | ah, al, bh, bl, ch, cl); | |
177 | ||
178 | ah = (regs->regs[38]) >> 32; | |
179 | al = (regs->regs[38]) & 0xffffffff; | |
180 | bh = (regs->regs[39]) >> 32; | |
181 | bl = (regs->regs[39]) & 0xffffffff; | |
182 | ch = (regs->regs[40]) >> 32; | |
183 | cl = (regs->regs[40]) & 0xffffffff; | |
184 | printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n", | |
185 | ah, al, bh, bl, ch, cl); | |
186 | ||
187 | ah = (regs->regs[41]) >> 32; | |
188 | al = (regs->regs[41]) & 0xffffffff; | |
189 | bh = (regs->regs[42]) >> 32; | |
190 | bl = (regs->regs[42]) & 0xffffffff; | |
191 | ch = (regs->regs[43]) >> 32; | |
192 | cl = (regs->regs[43]) & 0xffffffff; | |
193 | printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n", | |
194 | ah, al, bh, bl, ch, cl); | |
195 | ||
196 | ah = (regs->regs[44]) >> 32; | |
197 | al = (regs->regs[44]) & 0xffffffff; | |
198 | bh = (regs->regs[45]) >> 32; | |
199 | bl = (regs->regs[45]) & 0xffffffff; | |
200 | ch = (regs->regs[46]) >> 32; | |
201 | cl = (regs->regs[46]) & 0xffffffff; | |
202 | printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n", | |
203 | ah, al, bh, bl, ch, cl); | |
204 | ||
205 | ah = (regs->regs[47]) >> 32; | |
206 | al = (regs->regs[47]) & 0xffffffff; | |
207 | bh = (regs->regs[48]) >> 32; | |
208 | bl = (regs->regs[48]) & 0xffffffff; | |
209 | ch = (regs->regs[49]) >> 32; | |
210 | cl = (regs->regs[49]) & 0xffffffff; | |
211 | printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n", | |
212 | ah, al, bh, bl, ch, cl); | |
213 | ||
214 | ah = (regs->regs[50]) >> 32; | |
215 | al = (regs->regs[50]) & 0xffffffff; | |
216 | bh = (regs->regs[51]) >> 32; | |
217 | bl = (regs->regs[51]) & 0xffffffff; | |
218 | ch = (regs->regs[52]) >> 32; | |
219 | cl = (regs->regs[52]) & 0xffffffff; | |
220 | printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n", | |
221 | ah, al, bh, bl, ch, cl); | |
222 | ||
223 | ah = (regs->regs[53]) >> 32; | |
224 | al = (regs->regs[53]) & 0xffffffff; | |
225 | bh = (regs->regs[54]) >> 32; | |
226 | bl = (regs->regs[54]) & 0xffffffff; | |
227 | ch = (regs->regs[55]) >> 32; | |
228 | cl = (regs->regs[55]) & 0xffffffff; | |
229 | printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n", | |
230 | ah, al, bh, bl, ch, cl); | |
231 | ||
232 | ah = (regs->regs[56]) >> 32; | |
233 | al = (regs->regs[56]) & 0xffffffff; | |
234 | bh = (regs->regs[57]) >> 32; | |
235 | bl = (regs->regs[57]) & 0xffffffff; | |
236 | ch = (regs->regs[58]) >> 32; | |
237 | cl = (regs->regs[58]) & 0xffffffff; | |
238 | printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n", | |
239 | ah, al, bh, bl, ch, cl); | |
240 | ||
241 | ah = (regs->regs[59]) >> 32; | |
242 | al = (regs->regs[59]) & 0xffffffff; | |
243 | bh = (regs->regs[60]) >> 32; | |
244 | bl = (regs->regs[60]) & 0xffffffff; | |
245 | ch = (regs->regs[61]) >> 32; | |
246 | cl = (regs->regs[61]) & 0xffffffff; | |
247 | printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n", | |
248 | ah, al, bh, bl, ch, cl); | |
249 | ||
250 | ah = (regs->regs[62]) >> 32; | |
251 | al = (regs->regs[62]) & 0xffffffff; | |
252 | bh = (regs->tregs[0]) >> 32; | |
253 | bl = (regs->tregs[0]) & 0xffffffff; | |
254 | ch = (regs->tregs[1]) >> 32; | |
255 | cl = (regs->tregs[1]) & 0xffffffff; | |
256 | printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n", | |
257 | ah, al, bh, bl, ch, cl); | |
258 | ||
259 | ah = (regs->tregs[2]) >> 32; | |
260 | al = (regs->tregs[2]) & 0xffffffff; | |
261 | bh = (regs->tregs[3]) >> 32; | |
262 | bl = (regs->tregs[3]) & 0xffffffff; | |
263 | ch = (regs->tregs[4]) >> 32; | |
264 | cl = (regs->tregs[4]) & 0xffffffff; | |
265 | printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n", | |
266 | ah, al, bh, bl, ch, cl); | |
267 | ||
268 | ah = (regs->tregs[5]) >> 32; | |
269 | al = (regs->tregs[5]) & 0xffffffff; | |
270 | bh = (regs->tregs[6]) >> 32; | |
271 | bl = (regs->tregs[6]) & 0xffffffff; | |
272 | ch = (regs->tregs[7]) >> 32; | |
273 | cl = (regs->tregs[7]) & 0xffffffff; | |
274 | printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n", | |
275 | ah, al, bh, bl, ch, cl); | |
276 | ||
277 | /* | |
278 | * If we're in kernel mode, dump the stack too.. | |
279 | */ | |
280 | if (!user_mode(regs)) { | |
281 | void show_stack(struct task_struct *tsk, unsigned long *sp); | |
282 | unsigned long sp = regs->regs[15] & 0xffffffff; | |
283 | struct task_struct *tsk = get_current(); | |
284 | ||
285 | tsk->thread.kregs = regs; | |
286 | ||
287 | show_stack(tsk, (unsigned long *)sp); | |
288 | } | |
289 | } | |
290 | ||
1da177e4 LT |
291 | /* |
292 | * Free current thread data structures etc.. | |
293 | */ | |
e6464694 | 294 | void exit_thread(struct task_struct *tsk) |
1da177e4 | 295 | { |
a23ba435 PM |
296 | /* |
297 | * See arch/sparc/kernel/process.c for the precedent for doing | |
298 | * this -- RPC. | |
299 | * | |
300 | * The SH-5 FPU save/restore approach relies on | |
301 | * last_task_used_math pointing to a live task_struct. When | |
302 | * another task tries to use the FPU for the 1st time, the FPUDIS | |
303 | * trap handling (see arch/sh/kernel/cpu/sh5/fpu.c) will save the | |
304 | * existing FPU state to the FP regs field within | |
305 | * last_task_used_math before re-loading the new task's FPU state | |
306 | * (or initialising it if the FPU has been used before). So if | |
307 | * last_task_used_math is stale, and its page has already been | |
308 | * re-allocated for another use, the consequences are rather | |
309 | * grim. Unless we null it here, there is no other path through | |
310 | * which it would get safely nulled. | |
311 | */ | |
1da177e4 | 312 | #ifdef CONFIG_SH_FPU |
e6464694 | 313 | if (last_task_used_math == tsk) |
1da177e4 | 314 | last_task_used_math = NULL; |
1da177e4 LT |
315 | #endif |
316 | } | |
317 | ||
318 | void flush_thread(void) | |
319 | { | |
320 | ||
221af7f8 | 321 | /* Called by fs/exec.c (setup_new_exec) to remove traces of a |
1da177e4 LT |
322 | * previously running executable. */ |
323 | #ifdef CONFIG_SH_FPU | |
324 | if (last_task_used_math == current) { | |
325 | last_task_used_math = NULL; | |
326 | } | |
327 | /* Force FPU state to be reinitialised after exec */ | |
328 | clear_used_math(); | |
329 | #endif | |
330 | ||
331 | /* if we are a kernel thread, about to change to user thread, | |
332 | * update kreg | |
333 | */ | |
334 | if(current->thread.kregs==&fake_swapper_regs) { | |
335 | current->thread.kregs = | |
336 | ((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1); | |
337 | current->thread.uregs = current->thread.kregs; | |
338 | } | |
339 | } | |
340 | ||
341 | void release_thread(struct task_struct *dead_task) | |
342 | { | |
343 | /* do nothing */ | |
344 | } | |
345 | ||
346 | /* Fill in the fpu structure for a core dump.. */ | |
347 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
348 | { | |
349 | #ifdef CONFIG_SH_FPU | |
350 | int fpvalid; | |
351 | struct task_struct *tsk = current; | |
352 | ||
353 | fpvalid = !!tsk_used_math(tsk); | |
354 | if (fpvalid) { | |
355 | if (current == last_task_used_math) { | |
600ee240 | 356 | enable_fpu(); |
61cc7b0a | 357 | save_fpu(tsk); |
600ee240 | 358 | disable_fpu(); |
1da177e4 LT |
359 | last_task_used_math = 0; |
360 | regs->sr |= SR_FD; | |
361 | } | |
362 | ||
3ef2932b | 363 | memcpy(fpu, &tsk->thread.xstate->hardfpu, sizeof(*fpu)); |
1da177e4 LT |
364 | } |
365 | ||
366 | return fpvalid; | |
367 | #else | |
368 | return 0; /* Task didn't use the fpu at all. */ | |
369 | #endif | |
370 | } | |
4c978ca3 | 371 | EXPORT_SYMBOL(dump_fpu); |
1da177e4 LT |
372 | |
373 | asmlinkage void ret_from_fork(void); | |
7147e215 | 374 | asmlinkage void ret_from_kernel_thread(void); |
1da177e4 | 375 | |
6f2c55b8 | 376 | int copy_thread(unsigned long clone_flags, unsigned long usp, |
afa86fc4 | 377 | unsigned long arg, struct task_struct *p) |
1da177e4 | 378 | { |
8d28df81 | 379 | struct pt_regs *childregs; |
1da177e4 LT |
380 | |
381 | #ifdef CONFIG_SH_FPU | |
7147e215 AV |
382 | /* can't happen for a kernel thread */ |
383 | if (last_task_used_math == current) { | |
600ee240 | 384 | enable_fpu(); |
61cc7b0a | 385 | save_fpu(current); |
600ee240 | 386 | disable_fpu(); |
1da177e4 | 387 | last_task_used_math = NULL; |
0ad9513d | 388 | current_pt_regs()->sr |= SR_FD; |
1da177e4 LT |
389 | } |
390 | #endif | |
391 | /* Copy from sh version */ | |
ee8c1dd4 | 392 | childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1; |
7147e215 | 393 | p->thread.sp = (unsigned long) childregs; |
1da177e4 | 394 | |
7147e215 AV |
395 | if (unlikely(p->flags & PF_KTHREAD)) { |
396 | memset(childregs, 0, sizeof(struct pt_regs)); | |
397 | childregs->regs[2] = (unsigned long)arg; | |
42b43341 | 398 | childregs->regs[3] = (unsigned long)usp; |
7147e215 AV |
399 | childregs->sr = (1 << 30); /* not user_mode */ |
400 | childregs->sr |= SR_FD; /* Invalidate FPU flag */ | |
401 | p->thread.pc = (unsigned long) ret_from_kernel_thread; | |
402 | return 0; | |
403 | } | |
0ad9513d | 404 | *childregs = *current_pt_regs(); |
1da177e4 | 405 | |
c7914834 PM |
406 | /* |
407 | * Sign extend the edited stack. | |
408 | * Note that thread.pc and thread.pc will stay | |
409 | * 32-bit wide and context switch must take care | |
410 | * of NEFF sign extension. | |
411 | */ | |
0ad9513d AV |
412 | if (usp) |
413 | childregs->regs[15] = neff_sign_extend(usp); | |
7147e215 | 414 | p->thread.uregs = childregs; |
1da177e4 LT |
415 | |
416 | childregs->regs[9] = 0; /* Set return value for child */ | |
417 | childregs->sr |= SR_FD; /* Invalidate FPU flag */ | |
418 | ||
1da177e4 LT |
419 | p->thread.pc = (unsigned long) ret_from_fork; |
420 | ||
1da177e4 LT |
421 | return 0; |
422 | } | |
423 | ||
43081e18 | 424 | #ifdef CONFIG_FRAME_POINTER |
1da177e4 LT |
425 | static int in_sh64_switch_to(unsigned long pc) |
426 | { | |
427 | extern char __sh64_switch_to_end; | |
428 | /* For a sleeping task, the PC is somewhere in the middle of the function, | |
429 | so we don't have to worry about masking the LSB off */ | |
430 | return (pc >= (unsigned long) sh64_switch_to) && | |
431 | (pc < (unsigned long) &__sh64_switch_to_end); | |
432 | } | |
43081e18 | 433 | #endif |
1da177e4 LT |
434 | |
435 | unsigned long get_wchan(struct task_struct *p) | |
436 | { | |
1da177e4 LT |
437 | unsigned long pc; |
438 | ||
439 | if (!p || p == current || p->state == TASK_RUNNING) | |
440 | return 0; | |
441 | ||
442 | /* | |
443 | * The same comment as on the Alpha applies here, too ... | |
444 | */ | |
445 | pc = thread_saved_pc(p); | |
446 | ||
447 | #ifdef CONFIG_FRAME_POINTER | |
448 | if (in_sh64_switch_to(pc)) { | |
43081e18 PM |
449 | unsigned long schedule_fp; |
450 | unsigned long sh64_switch_to_fp; | |
451 | unsigned long schedule_caller_pc; | |
452 | ||
1da177e4 LT |
453 | sh64_switch_to_fp = (long) p->thread.sp; |
454 | /* r14 is saved at offset 4 in the sh64_switch_to frame */ | |
455 | schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4); | |
456 | ||
457 | /* and the caller of 'schedule' is (currently!) saved at offset 24 | |
458 | in the frame of schedule (from disasm) */ | |
459 | schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24); | |
460 | return schedule_caller_pc; | |
461 | } | |
462 | #endif | |
463 | return pc; | |
464 | } |