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