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Linux/arch/sh/kernel/process_64.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * arch/sh/kernel/process_64.c
  4  *
  5  * This file handles the architecture-dependent parts of process handling..
  6  *
  7  * Copyright (C) 2000, 2001  Paolo Alberelli
  8  * Copyright (C) 2003 - 2007  Paul Mundt
  9  * Copyright (C) 2003, 2004 Richard Curnow
 10  *
 11  * Started from SH3/4 version:
 12  *   Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
 13  *
 14  *   In turn started from i386 version:
 15  *     Copyright (C) 1995  Linus Torvalds
 16  */
 17 #include <linux/mm.h>
 18 #include <linux/fs.h>
 19 #include <linux/ptrace.h>
 20 #include <linux/reboot.h>
 21 #include <linux/slab.h>
 22 #include <linux/init.h>
 23 #include <linux/module.h>
 24 #include <linux/io.h>
 25 #include <linux/sched/debug.h>
 26 #include <linux/sched/task.h>
 27 #include <linux/sched/task_stack.h>
 28 #include <asm/syscalls.h>
 29 #include <linux/uaccess.h>
 30 #include <asm/pgtable.h>
 31 #include <asm/mmu_context.h>
 32 #include <asm/fpu.h>
 33 #include <asm/switch_to.h>
 34 
 35 struct task_struct *last_task_used_math = NULL;
 36 struct pt_regs fake_swapper_regs = { 0, };
 37 
 38 void show_regs(struct pt_regs *regs)
 39 {
 40         unsigned long long ah, al, bh, bl, ch, cl;
 41 
 42         printk("\n");
 43         show_regs_print_info(KERN_DEFAULT);
 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 
288 /*
289  * Free current thread data structures etc..
290  */
291 void exit_thread(struct task_struct *tsk)
292 {
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          */
309 #ifdef CONFIG_SH_FPU
310         if (last_task_used_math == tsk)
311                 last_task_used_math = NULL;
312 #endif
313 }
314 
315 void flush_thread(void)
316 {
317 
318         /* Called by fs/exec.c (setup_new_exec) to remove traces of a
319          * previously running executable. */
320 #ifdef CONFIG_SH_FPU
321         if (last_task_used_math == current) {
322                 last_task_used_math = NULL;
323         }
324         /* Force FPU state to be reinitialised after exec */
325         clear_used_math();
326 #endif
327 
328         /* if we are a kernel thread, about to change to user thread,
329          * update kreg
330          */
331         if(current->thread.kregs==&fake_swapper_regs) {
332           current->thread.kregs =
333              ((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1);
334           current->thread.uregs = current->thread.kregs;
335         }
336 }
337 
338 void release_thread(struct task_struct *dead_task)
339 {
340         /* do nothing */
341 }
342 
343 /* Fill in the fpu structure for a core dump.. */
344 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
345 {
346 #ifdef CONFIG_SH_FPU
347         int fpvalid;
348         struct task_struct *tsk = current;
349 
350         fpvalid = !!tsk_used_math(tsk);
351         if (fpvalid) {
352                 if (current == last_task_used_math) {
353                         enable_fpu();
354                         save_fpu(tsk);
355                         disable_fpu();
356                         last_task_used_math = 0;
357                         regs->sr |= SR_FD;
358                 }
359 
360                 memcpy(fpu, &tsk->thread.xstate->hardfpu, sizeof(*fpu));
361         }
362 
363         return fpvalid;
364 #else
365         return 0; /* Task didn't use the fpu at all. */
366 #endif
367 }
368 EXPORT_SYMBOL(dump_fpu);
369 
370 asmlinkage void ret_from_fork(void);
371 asmlinkage void ret_from_kernel_thread(void);
372 
373 int copy_thread(unsigned long clone_flags, unsigned long usp,
374                 unsigned long arg, struct task_struct *p)
375 {
376         struct pt_regs *childregs;
377 
378 #ifdef CONFIG_SH_FPU
379         /* can't happen for a kernel thread */
380         if (last_task_used_math == current) {
381                 enable_fpu();
382                 save_fpu(current);
383                 disable_fpu();
384                 last_task_used_math = NULL;
385                 current_pt_regs()->sr |= SR_FD;
386         }
387 #endif
388         /* Copy from sh version */
389         childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1;
390         p->thread.sp = (unsigned long) childregs;
391 
392         if (unlikely(p->flags & PF_KTHREAD)) {
393                 memset(childregs, 0, sizeof(struct pt_regs));
394                 childregs->regs[2] = (unsigned long)arg;
395                 childregs->regs[3] = (unsigned long)usp;
396                 childregs->sr = (1 << 30); /* not user_mode */
397                 childregs->sr |= SR_FD; /* Invalidate FPU flag */
398                 p->thread.pc = (unsigned long) ret_from_kernel_thread;
399                 return 0;
400         }
401         *childregs = *current_pt_regs();
402 
403         /*
404          * Sign extend the edited stack.
405          * Note that thread.pc and thread.pc will stay
406          * 32-bit wide and context switch must take care
407          * of NEFF sign extension.
408          */
409         if (usp)
410                 childregs->regs[15] = neff_sign_extend(usp);
411         p->thread.uregs = childregs;
412 
413         childregs->regs[9] = 0; /* Set return value for child */
414         childregs->sr |= SR_FD; /* Invalidate FPU flag */
415 
416         p->thread.pc = (unsigned long) ret_from_fork;
417 
418         return 0;
419 }
420 
421 #ifdef CONFIG_FRAME_POINTER
422 static int in_sh64_switch_to(unsigned long pc)
423 {
424         extern char __sh64_switch_to_end;
425         /* For a sleeping task, the PC is somewhere in the middle of the function,
426            so we don't have to worry about masking the LSB off */
427         return (pc >= (unsigned long) sh64_switch_to) &&
428                (pc < (unsigned long) &__sh64_switch_to_end);
429 }
430 #endif
431 
432 unsigned long get_wchan(struct task_struct *p)
433 {
434         unsigned long pc;
435 
436         if (!p || p == current || p->state == TASK_RUNNING)
437                 return 0;
438 
439         /*
440          * The same comment as on the Alpha applies here, too ...
441          */
442         pc = thread_saved_pc(p);
443 
444 #ifdef CONFIG_FRAME_POINTER
445         if (in_sh64_switch_to(pc)) {
446                 unsigned long schedule_fp;
447                 unsigned long sh64_switch_to_fp;
448                 unsigned long schedule_caller_pc;
449 
450                 sh64_switch_to_fp = (long) p->thread.sp;
451                 /* r14 is saved at offset 4 in the sh64_switch_to frame */
452                 schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4);
453 
454                 /* and the caller of 'schedule' is (currently!) saved at offset 24
455                    in the frame of schedule (from disasm) */
456                 schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24);
457                 return schedule_caller_pc;
458         }
459 #endif
460         return pc;
461 }
462 

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