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1/*
2 * arch/sh/kernel/process_64.c
3 *
4 * This file handles the architecture-dependent parts of process handling..
5 *
6 * Copyright (C) 2000, 2001 Paolo Alberelli
7 * Copyright (C) 2003 - 2007 Paul Mundt
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 *
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.
19 */
20#include <linux/mm.h>
21#include <linux/fs.h>
22#include <linux/ptrace.h>
23#include <linux/reboot.h>
24#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/module.h>
27#include <linux/io.h>
28#include <asm/syscalls.h>
29#include <asm/uaccess.h>
30#include <asm/pgtable.h>
31#include <asm/mmu_context.h>
32#include <asm/fpu.h>
33
34struct task_struct *last_task_used_math = NULL;
35
36void show_regs(struct pt_regs *regs)
37{
38 unsigned long long ah, al, bh, bl, ch, cl;
39
40 printk("\n");
41
42 ah = (regs->pc) >> 32;
43 al = (regs->pc) & 0xffffffff;
44 bh = (regs->regs[18]) >> 32;
45 bl = (regs->regs[18]) & 0xffffffff;
46 ch = (regs->regs[15]) >> 32;
47 cl = (regs->regs[15]) & 0xffffffff;
48 printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n",
49 ah, al, bh, bl, ch, cl);
50
51 ah = (regs->sr) >> 32;
52 al = (regs->sr) & 0xffffffff;
53 asm volatile ("getcon " __TEA ", %0" : "=r" (bh));
54 asm volatile ("getcon " __TEA ", %0" : "=r" (bl));
55 bh = (bh) >> 32;
56 bl = (bl) & 0xffffffff;
57 asm volatile ("getcon " __KCR0 ", %0" : "=r" (ch));
58 asm volatile ("getcon " __KCR0 ", %0" : "=r" (cl));
59 ch = (ch) >> 32;
60 cl = (cl) & 0xffffffff;
61 printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n",
62 ah, al, bh, bl, ch, cl);
63
64 ah = (regs->regs[0]) >> 32;
65 al = (regs->regs[0]) & 0xffffffff;
66 bh = (regs->regs[1]) >> 32;
67 bl = (regs->regs[1]) & 0xffffffff;
68 ch = (regs->regs[2]) >> 32;
69 cl = (regs->regs[2]) & 0xffffffff;
70 printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n",
71 ah, al, bh, bl, ch, cl);
72
73 ah = (regs->regs[3]) >> 32;
74 al = (regs->regs[3]) & 0xffffffff;
75 bh = (regs->regs[4]) >> 32;
76 bl = (regs->regs[4]) & 0xffffffff;
77 ch = (regs->regs[5]) >> 32;
78 cl = (regs->regs[5]) & 0xffffffff;
79 printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n",
80 ah, al, bh, bl, ch, cl);
81
82 ah = (regs->regs[6]) >> 32;
83 al = (regs->regs[6]) & 0xffffffff;
84 bh = (regs->regs[7]) >> 32;
85 bl = (regs->regs[7]) & 0xffffffff;
86 ch = (regs->regs[8]) >> 32;
87 cl = (regs->regs[8]) & 0xffffffff;
88 printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n",
89 ah, al, bh, bl, ch, cl);
90
91 ah = (regs->regs[9]) >> 32;
92 al = (regs->regs[9]) & 0xffffffff;
93 bh = (regs->regs[10]) >> 32;
94 bl = (regs->regs[10]) & 0xffffffff;
95 ch = (regs->regs[11]) >> 32;
96 cl = (regs->regs[11]) & 0xffffffff;
97 printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n",
98 ah, al, bh, bl, ch, cl);
99
100 ah = (regs->regs[12]) >> 32;
101 al = (regs->regs[12]) & 0xffffffff;
102 bh = (regs->regs[13]) >> 32;
103 bl = (regs->regs[13]) & 0xffffffff;
104 ch = (regs->regs[14]) >> 32;
105 cl = (regs->regs[14]) & 0xffffffff;
106 printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n",
107 ah, al, bh, bl, ch, cl);
108
109 ah = (regs->regs[16]) >> 32;
110 al = (regs->regs[16]) & 0xffffffff;
111 bh = (regs->regs[17]) >> 32;
112 bl = (regs->regs[17]) & 0xffffffff;
113 ch = (regs->regs[19]) >> 32;
114 cl = (regs->regs[19]) & 0xffffffff;
115 printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n",
116 ah, al, bh, bl, ch, cl);
117
118 ah = (regs->regs[20]) >> 32;
119 al = (regs->regs[20]) & 0xffffffff;
120 bh = (regs->regs[21]) >> 32;
121 bl = (regs->regs[21]) & 0xffffffff;
122 ch = (regs->regs[22]) >> 32;
123 cl = (regs->regs[22]) & 0xffffffff;
124 printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n",
125 ah, al, bh, bl, ch, cl);
126
127 ah = (regs->regs[23]) >> 32;
128 al = (regs->regs[23]) & 0xffffffff;
129 bh = (regs->regs[24]) >> 32;
130 bl = (regs->regs[24]) & 0xffffffff;
131 ch = (regs->regs[25]) >> 32;
132 cl = (regs->regs[25]) & 0xffffffff;
133 printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n",
134 ah, al, bh, bl, ch, cl);
135
136 ah = (regs->regs[26]) >> 32;
137 al = (regs->regs[26]) & 0xffffffff;
138 bh = (regs->regs[27]) >> 32;
139 bl = (regs->regs[27]) & 0xffffffff;
140 ch = (regs->regs[28]) >> 32;
141 cl = (regs->regs[28]) & 0xffffffff;
142 printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n",
143 ah, al, bh, bl, ch, cl);
144
145 ah = (regs->regs[29]) >> 32;
146 al = (regs->regs[29]) & 0xffffffff;
147 bh = (regs->regs[30]) >> 32;
148 bl = (regs->regs[30]) & 0xffffffff;
149 ch = (regs->regs[31]) >> 32;
150 cl = (regs->regs[31]) & 0xffffffff;
151 printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n",
152 ah, al, bh, bl, ch, cl);
153
154 ah = (regs->regs[32]) >> 32;
155 al = (regs->regs[32]) & 0xffffffff;
156 bh = (regs->regs[33]) >> 32;
157 bl = (regs->regs[33]) & 0xffffffff;
158 ch = (regs->regs[34]) >> 32;
159 cl = (regs->regs[34]) & 0xffffffff;
160 printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n",
161 ah, al, bh, bl, ch, cl);
162
163 ah = (regs->regs[35]) >> 32;
164 al = (regs->regs[35]) & 0xffffffff;
165 bh = (regs->regs[36]) >> 32;
166 bl = (regs->regs[36]) & 0xffffffff;
167 ch = (regs->regs[37]) >> 32;
168 cl = (regs->regs[37]) & 0xffffffff;
169 printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n",
170 ah, al, bh, bl, ch, cl);
171
172 ah = (regs->regs[38]) >> 32;
173 al = (regs->regs[38]) & 0xffffffff;
174 bh = (regs->regs[39]) >> 32;
175 bl = (regs->regs[39]) & 0xffffffff;
176 ch = (regs->regs[40]) >> 32;
177 cl = (regs->regs[40]) & 0xffffffff;
178 printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n",
179 ah, al, bh, bl, ch, cl);
180
181 ah = (regs->regs[41]) >> 32;
182 al = (regs->regs[41]) & 0xffffffff;
183 bh = (regs->regs[42]) >> 32;
184 bl = (regs->regs[42]) & 0xffffffff;
185 ch = (regs->regs[43]) >> 32;
186 cl = (regs->regs[43]) & 0xffffffff;
187 printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n",
188 ah, al, bh, bl, ch, cl);
189
190 ah = (regs->regs[44]) >> 32;
191 al = (regs->regs[44]) & 0xffffffff;
192 bh = (regs->regs[45]) >> 32;
193 bl = (regs->regs[45]) & 0xffffffff;
194 ch = (regs->regs[46]) >> 32;
195 cl = (regs->regs[46]) & 0xffffffff;
196 printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n",
197 ah, al, bh, bl, ch, cl);
198
199 ah = (regs->regs[47]) >> 32;
200 al = (regs->regs[47]) & 0xffffffff;
201 bh = (regs->regs[48]) >> 32;
202 bl = (regs->regs[48]) & 0xffffffff;
203 ch = (regs->regs[49]) >> 32;
204 cl = (regs->regs[49]) & 0xffffffff;
205 printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n",
206 ah, al, bh, bl, ch, cl);
207
208 ah = (regs->regs[50]) >> 32;
209 al = (regs->regs[50]) & 0xffffffff;
210 bh = (regs->regs[51]) >> 32;
211 bl = (regs->regs[51]) & 0xffffffff;
212 ch = (regs->regs[52]) >> 32;
213 cl = (regs->regs[52]) & 0xffffffff;
214 printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n",
215 ah, al, bh, bl, ch, cl);
216
217 ah = (regs->regs[53]) >> 32;
218 al = (regs->regs[53]) & 0xffffffff;
219 bh = (regs->regs[54]) >> 32;
220 bl = (regs->regs[54]) & 0xffffffff;
221 ch = (regs->regs[55]) >> 32;
222 cl = (regs->regs[55]) & 0xffffffff;
223 printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n",
224 ah, al, bh, bl, ch, cl);
225
226 ah = (regs->regs[56]) >> 32;
227 al = (regs->regs[56]) & 0xffffffff;
228 bh = (regs->regs[57]) >> 32;
229 bl = (regs->regs[57]) & 0xffffffff;
230 ch = (regs->regs[58]) >> 32;
231 cl = (regs->regs[58]) & 0xffffffff;
232 printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n",
233 ah, al, bh, bl, ch, cl);
234
235 ah = (regs->regs[59]) >> 32;
236 al = (regs->regs[59]) & 0xffffffff;
237 bh = (regs->regs[60]) >> 32;
238 bl = (regs->regs[60]) & 0xffffffff;
239 ch = (regs->regs[61]) >> 32;
240 cl = (regs->regs[61]) & 0xffffffff;
241 printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n",
242 ah, al, bh, bl, ch, cl);
243
244 ah = (regs->regs[62]) >> 32;
245 al = (regs->regs[62]) & 0xffffffff;
246 bh = (regs->tregs[0]) >> 32;
247 bl = (regs->tregs[0]) & 0xffffffff;
248 ch = (regs->tregs[1]) >> 32;
249 cl = (regs->tregs[1]) & 0xffffffff;
250 printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n",
251 ah, al, bh, bl, ch, cl);
252
253 ah = (regs->tregs[2]) >> 32;
254 al = (regs->tregs[2]) & 0xffffffff;
255 bh = (regs->tregs[3]) >> 32;
256 bl = (regs->tregs[3]) & 0xffffffff;
257 ch = (regs->tregs[4]) >> 32;
258 cl = (regs->tregs[4]) & 0xffffffff;
259 printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n",
260 ah, al, bh, bl, ch, cl);
261
262 ah = (regs->tregs[5]) >> 32;
263 al = (regs->tregs[5]) & 0xffffffff;
264 bh = (regs->tregs[6]) >> 32;
265 bl = (regs->tregs[6]) & 0xffffffff;
266 ch = (regs->tregs[7]) >> 32;
267 cl = (regs->tregs[7]) & 0xffffffff;
268 printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n",
269 ah, al, bh, bl, ch, cl);
270
271 /*
272 * If we're in kernel mode, dump the stack too..
273 */
274 if (!user_mode(regs)) {
275 void show_stack(struct task_struct *tsk, unsigned long *sp);
276 unsigned long sp = regs->regs[15] & 0xffffffff;
277 struct task_struct *tsk = get_current();
278
279 tsk->thread.kregs = regs;
280
281 show_stack(tsk, (unsigned long *)sp);
282 }
283}
284
285/*
286 * Create a kernel thread
287 */
288ATTRIB_NORET void kernel_thread_helper(void *arg, int (*fn)(void *))
289{
290 do_exit(fn(arg));
291}
292
293/*
294 * This is the mechanism for creating a new kernel thread.
295 *
296 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
297 * who haven't done an "execve()") should use this: it will work within
298 * a system call from a "real" process, but the process memory space will
299 * not be freed until both the parent and the child have exited.
300 */
301int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
302{
303 struct pt_regs regs;
304
305 memset(®s, 0, sizeof(regs));
306 regs.regs[2] = (unsigned long)arg;
307 regs.regs[3] = (unsigned long)fn;
308
309 regs.pc = (unsigned long)kernel_thread_helper;
310 regs.sr = (1 << 30);
311
312 /* Ok, create the new process.. */
313 return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
314 ®s, 0, NULL, NULL);
315}
316EXPORT_SYMBOL(kernel_thread);
317
318/*
319 * Free current thread data structures etc..
320 */
321void exit_thread(void)
322{
323 /*
324 * See arch/sparc/kernel/process.c for the precedent for doing
325 * this -- RPC.
326 *
327 * The SH-5 FPU save/restore approach relies on
328 * last_task_used_math pointing to a live task_struct. When
329 * another task tries to use the FPU for the 1st time, the FPUDIS
330 * trap handling (see arch/sh/kernel/cpu/sh5/fpu.c) will save the
331 * existing FPU state to the FP regs field within
332 * last_task_used_math before re-loading the new task's FPU state
333 * (or initialising it if the FPU has been used before). So if
334 * last_task_used_math is stale, and its page has already been
335 * re-allocated for another use, the consequences are rather
336 * grim. Unless we null it here, there is no other path through
337 * which it would get safely nulled.
338 */
339#ifdef CONFIG_SH_FPU
340 if (last_task_used_math == current) {
341 last_task_used_math = NULL;
342 }
343#endif
344}
345
346void flush_thread(void)
347{
348
349 /* Called by fs/exec.c (setup_new_exec) to remove traces of a
350 * previously running executable. */
351#ifdef CONFIG_SH_FPU
352 if (last_task_used_math == current) {
353 last_task_used_math = NULL;
354 }
355 /* Force FPU state to be reinitialised after exec */
356 clear_used_math();
357#endif
358
359 /* if we are a kernel thread, about to change to user thread,
360 * update kreg
361 */
362 if(current->thread.kregs==&fake_swapper_regs) {
363 current->thread.kregs =
364 ((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1);
365 current->thread.uregs = current->thread.kregs;
366 }
367}
368
369void release_thread(struct task_struct *dead_task)
370{
371 /* do nothing */
372}
373
374/* Fill in the fpu structure for a core dump.. */
375int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
376{
377#ifdef CONFIG_SH_FPU
378 int fpvalid;
379 struct task_struct *tsk = current;
380
381 fpvalid = !!tsk_used_math(tsk);
382 if (fpvalid) {
383 if (current == last_task_used_math) {
384 enable_fpu();
385 save_fpu(tsk);
386 disable_fpu();
387 last_task_used_math = 0;
388 regs->sr |= SR_FD;
389 }
390
391 memcpy(fpu, &tsk->thread.xstate->hardfpu, sizeof(*fpu));
392 }
393
394 return fpvalid;
395#else
396 return 0; /* Task didn't use the fpu at all. */
397#endif
398}
399EXPORT_SYMBOL(dump_fpu);
400
401asmlinkage void ret_from_fork(void);
402
403int copy_thread(unsigned long clone_flags, unsigned long usp,
404 unsigned long unused,
405 struct task_struct *p, struct pt_regs *regs)
406{
407 struct pt_regs *childregs;
408
409#ifdef CONFIG_SH_FPU
410 if(last_task_used_math == current) {
411 enable_fpu();
412 save_fpu(current);
413 disable_fpu();
414 last_task_used_math = NULL;
415 regs->sr |= SR_FD;
416 }
417#endif
418 /* Copy from sh version */
419 childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1;
420
421 *childregs = *regs;
422
423 /*
424 * Sign extend the edited stack.
425 * Note that thread.pc and thread.pc will stay
426 * 32-bit wide and context switch must take care
427 * of NEFF sign extension.
428 */
429 if (user_mode(regs)) {
430 childregs->regs[15] = neff_sign_extend(usp);
431 p->thread.uregs = childregs;
432 } else {
433 childregs->regs[15] =
434 neff_sign_extend((unsigned long)task_stack_page(p) +
435 THREAD_SIZE);
436 }
437
438 childregs->regs[9] = 0; /* Set return value for child */
439 childregs->sr |= SR_FD; /* Invalidate FPU flag */
440
441 p->thread.sp = (unsigned long) childregs;
442 p->thread.pc = (unsigned long) ret_from_fork;
443
444 return 0;
445}
446
447asmlinkage int sys_fork(unsigned long r2, unsigned long r3,
448 unsigned long r4, unsigned long r5,
449 unsigned long r6, unsigned long r7,
450 struct pt_regs *pregs)
451{
452 return do_fork(SIGCHLD, pregs->regs[15], pregs, 0, 0, 0);
453}
454
455asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
456 unsigned long r4, unsigned long r5,
457 unsigned long r6, unsigned long r7,
458 struct pt_regs *pregs)
459{
460 if (!newsp)
461 newsp = pregs->regs[15];
462 return do_fork(clone_flags, newsp, pregs, 0, 0, 0);
463}
464
465/*
466 * This is trivial, and on the face of it looks like it
467 * could equally well be done in user mode.
468 *
469 * Not so, for quite unobvious reasons - register pressure.
470 * In user mode vfork() cannot have a stack frame, and if
471 * done by calling the "clone()" system call directly, you
472 * do not have enough call-clobbered registers to hold all
473 * the information you need.
474 */
475asmlinkage int sys_vfork(unsigned long r2, unsigned long r3,
476 unsigned long r4, unsigned long r5,
477 unsigned long r6, unsigned long r7,
478 struct pt_regs *pregs)
479{
480 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, pregs->regs[15], pregs, 0, 0, 0);
481}
482
483/*
484 * sys_execve() executes a new program.
485 */
486asmlinkage int sys_execve(const char *ufilename, char **uargv,
487 char **uenvp, unsigned long r5,
488 unsigned long r6, unsigned long r7,
489 struct pt_regs *pregs)
490{
491 int error;
492 char *filename;
493
494 filename = getname((char __user *)ufilename);
495 error = PTR_ERR(filename);
496 if (IS_ERR(filename))
497 goto out;
498
499 error = do_execve(filename,
500 (const char __user *const __user *)uargv,
501 (const char __user *const __user *)uenvp,
502 pregs);
503 putname(filename);
504out:
505 return error;
506}
507
508#ifdef CONFIG_FRAME_POINTER
509static int in_sh64_switch_to(unsigned long pc)
510{
511 extern char __sh64_switch_to_end;
512 /* For a sleeping task, the PC is somewhere in the middle of the function,
513 so we don't have to worry about masking the LSB off */
514 return (pc >= (unsigned long) sh64_switch_to) &&
515 (pc < (unsigned long) &__sh64_switch_to_end);
516}
517#endif
518
519unsigned long get_wchan(struct task_struct *p)
520{
521 unsigned long pc;
522
523 if (!p || p == current || p->state == TASK_RUNNING)
524 return 0;
525
526 /*
527 * The same comment as on the Alpha applies here, too ...
528 */
529 pc = thread_saved_pc(p);
530
531#ifdef CONFIG_FRAME_POINTER
532 if (in_sh64_switch_to(pc)) {
533 unsigned long schedule_fp;
534 unsigned long sh64_switch_to_fp;
535 unsigned long schedule_caller_pc;
536
537 sh64_switch_to_fp = (long) p->thread.sp;
538 /* r14 is saved at offset 4 in the sh64_switch_to frame */
539 schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4);
540
541 /* and the caller of 'schedule' is (currently!) saved at offset 24
542 in the frame of schedule (from disasm) */
543 schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24);
544 return schedule_caller_pc;
545 }
546#endif
547 return pc;
548}