2 * arch/sh/kernel/process_64.c
4 * This file handles the architecture-dependent parts of process handling..
6 * Copyright (C) 2000, 2001 Paolo Alberelli
7 * Copyright (C) 2003 - 2007 Paul Mundt
8 * Copyright (C) 2003, 2004 Richard Curnow
10 * Started from SH3/4 version:
11 * Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
13 * In turn started from i386 version:
14 * Copyright (C) 1995 Linus Torvalds
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
22 #include <linux/ptrace.h>
23 #include <linux/reboot.h>
24 #include <linux/init.h>
25 #include <linux/module.h>
27 #include <asm/syscalls.h>
28 #include <asm/uaccess.h>
29 #include <asm/pgtable.h>
30 #include <asm/mmu_context.h>
33 struct task_struct *last_task_used_math = NULL;
35 void show_regs(struct pt_regs *regs)
37 unsigned long long ah, al, bh, bl, ch, cl;
41 ah = (regs->pc) >> 32;
42 al = (regs->pc) & 0xffffffff;
43 bh = (regs->regs[18]) >> 32;
44 bl = (regs->regs[18]) & 0xffffffff;
45 ch = (regs->regs[15]) >> 32;
46 cl = (regs->regs[15]) & 0xffffffff;
47 printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n",
48 ah, al, bh, bl, ch, cl);
50 ah = (regs->sr) >> 32;
51 al = (regs->sr) & 0xffffffff;
52 asm volatile ("getcon " __TEA ", %0" : "=r" (bh));
53 asm volatile ("getcon " __TEA ", %0" : "=r" (bl));
55 bl = (bl) & 0xffffffff;
56 asm volatile ("getcon " __KCR0 ", %0" : "=r" (ch));
57 asm volatile ("getcon " __KCR0 ", %0" : "=r" (cl));
59 cl = (cl) & 0xffffffff;
60 printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n",
61 ah, al, bh, bl, ch, cl);
63 ah = (regs->regs[0]) >> 32;
64 al = (regs->regs[0]) & 0xffffffff;
65 bh = (regs->regs[1]) >> 32;
66 bl = (regs->regs[1]) & 0xffffffff;
67 ch = (regs->regs[2]) >> 32;
68 cl = (regs->regs[2]) & 0xffffffff;
69 printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n",
70 ah, al, bh, bl, ch, cl);
72 ah = (regs->regs[3]) >> 32;
73 al = (regs->regs[3]) & 0xffffffff;
74 bh = (regs->regs[4]) >> 32;
75 bl = (regs->regs[4]) & 0xffffffff;
76 ch = (regs->regs[5]) >> 32;
77 cl = (regs->regs[5]) & 0xffffffff;
78 printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n",
79 ah, al, bh, bl, ch, cl);
81 ah = (regs->regs[6]) >> 32;
82 al = (regs->regs[6]) & 0xffffffff;
83 bh = (regs->regs[7]) >> 32;
84 bl = (regs->regs[7]) & 0xffffffff;
85 ch = (regs->regs[8]) >> 32;
86 cl = (regs->regs[8]) & 0xffffffff;
87 printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n",
88 ah, al, bh, bl, ch, cl);
90 ah = (regs->regs[9]) >> 32;
91 al = (regs->regs[9]) & 0xffffffff;
92 bh = (regs->regs[10]) >> 32;
93 bl = (regs->regs[10]) & 0xffffffff;
94 ch = (regs->regs[11]) >> 32;
95 cl = (regs->regs[11]) & 0xffffffff;
96 printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n",
97 ah, al, bh, bl, ch, cl);
99 ah = (regs->regs[12]) >> 32;
100 al = (regs->regs[12]) & 0xffffffff;
101 bh = (regs->regs[13]) >> 32;
102 bl = (regs->regs[13]) & 0xffffffff;
103 ch = (regs->regs[14]) >> 32;
104 cl = (regs->regs[14]) & 0xffffffff;
105 printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n",
106 ah, al, bh, bl, ch, cl);
108 ah = (regs->regs[16]) >> 32;
109 al = (regs->regs[16]) & 0xffffffff;
110 bh = (regs->regs[17]) >> 32;
111 bl = (regs->regs[17]) & 0xffffffff;
112 ch = (regs->regs[19]) >> 32;
113 cl = (regs->regs[19]) & 0xffffffff;
114 printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n",
115 ah, al, bh, bl, ch, cl);
117 ah = (regs->regs[20]) >> 32;
118 al = (regs->regs[20]) & 0xffffffff;
119 bh = (regs->regs[21]) >> 32;
120 bl = (regs->regs[21]) & 0xffffffff;
121 ch = (regs->regs[22]) >> 32;
122 cl = (regs->regs[22]) & 0xffffffff;
123 printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n",
124 ah, al, bh, bl, ch, cl);
126 ah = (regs->regs[23]) >> 32;
127 al = (regs->regs[23]) & 0xffffffff;
128 bh = (regs->regs[24]) >> 32;
129 bl = (regs->regs[24]) & 0xffffffff;
130 ch = (regs->regs[25]) >> 32;
131 cl = (regs->regs[25]) & 0xffffffff;
132 printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n",
133 ah, al, bh, bl, ch, cl);
135 ah = (regs->regs[26]) >> 32;
136 al = (regs->regs[26]) & 0xffffffff;
137 bh = (regs->regs[27]) >> 32;
138 bl = (regs->regs[27]) & 0xffffffff;
139 ch = (regs->regs[28]) >> 32;
140 cl = (regs->regs[28]) & 0xffffffff;
141 printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n",
142 ah, al, bh, bl, ch, cl);
144 ah = (regs->regs[29]) >> 32;
145 al = (regs->regs[29]) & 0xffffffff;
146 bh = (regs->regs[30]) >> 32;
147 bl = (regs->regs[30]) & 0xffffffff;
148 ch = (regs->regs[31]) >> 32;
149 cl = (regs->regs[31]) & 0xffffffff;
150 printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n",
151 ah, al, bh, bl, ch, cl);
153 ah = (regs->regs[32]) >> 32;
154 al = (regs->regs[32]) & 0xffffffff;
155 bh = (regs->regs[33]) >> 32;
156 bl = (regs->regs[33]) & 0xffffffff;
157 ch = (regs->regs[34]) >> 32;
158 cl = (regs->regs[34]) & 0xffffffff;
159 printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n",
160 ah, al, bh, bl, ch, cl);
162 ah = (regs->regs[35]) >> 32;
163 al = (regs->regs[35]) & 0xffffffff;
164 bh = (regs->regs[36]) >> 32;
165 bl = (regs->regs[36]) & 0xffffffff;
166 ch = (regs->regs[37]) >> 32;
167 cl = (regs->regs[37]) & 0xffffffff;
168 printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n",
169 ah, al, bh, bl, ch, cl);
171 ah = (regs->regs[38]) >> 32;
172 al = (regs->regs[38]) & 0xffffffff;
173 bh = (regs->regs[39]) >> 32;
174 bl = (regs->regs[39]) & 0xffffffff;
175 ch = (regs->regs[40]) >> 32;
176 cl = (regs->regs[40]) & 0xffffffff;
177 printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n",
178 ah, al, bh, bl, ch, cl);
180 ah = (regs->regs[41]) >> 32;
181 al = (regs->regs[41]) & 0xffffffff;
182 bh = (regs->regs[42]) >> 32;
183 bl = (regs->regs[42]) & 0xffffffff;
184 ch = (regs->regs[43]) >> 32;
185 cl = (regs->regs[43]) & 0xffffffff;
186 printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n",
187 ah, al, bh, bl, ch, cl);
189 ah = (regs->regs[44]) >> 32;
190 al = (regs->regs[44]) & 0xffffffff;
191 bh = (regs->regs[45]) >> 32;
192 bl = (regs->regs[45]) & 0xffffffff;
193 ch = (regs->regs[46]) >> 32;
194 cl = (regs->regs[46]) & 0xffffffff;
195 printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n",
196 ah, al, bh, bl, ch, cl);
198 ah = (regs->regs[47]) >> 32;
199 al = (regs->regs[47]) & 0xffffffff;
200 bh = (regs->regs[48]) >> 32;
201 bl = (regs->regs[48]) & 0xffffffff;
202 ch = (regs->regs[49]) >> 32;
203 cl = (regs->regs[49]) & 0xffffffff;
204 printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n",
205 ah, al, bh, bl, ch, cl);
207 ah = (regs->regs[50]) >> 32;
208 al = (regs->regs[50]) & 0xffffffff;
209 bh = (regs->regs[51]) >> 32;
210 bl = (regs->regs[51]) & 0xffffffff;
211 ch = (regs->regs[52]) >> 32;
212 cl = (regs->regs[52]) & 0xffffffff;
213 printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n",
214 ah, al, bh, bl, ch, cl);
216 ah = (regs->regs[53]) >> 32;
217 al = (regs->regs[53]) & 0xffffffff;
218 bh = (regs->regs[54]) >> 32;
219 bl = (regs->regs[54]) & 0xffffffff;
220 ch = (regs->regs[55]) >> 32;
221 cl = (regs->regs[55]) & 0xffffffff;
222 printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n",
223 ah, al, bh, bl, ch, cl);
225 ah = (regs->regs[56]) >> 32;
226 al = (regs->regs[56]) & 0xffffffff;
227 bh = (regs->regs[57]) >> 32;
228 bl = (regs->regs[57]) & 0xffffffff;
229 ch = (regs->regs[58]) >> 32;
230 cl = (regs->regs[58]) & 0xffffffff;
231 printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n",
232 ah, al, bh, bl, ch, cl);
234 ah = (regs->regs[59]) >> 32;
235 al = (regs->regs[59]) & 0xffffffff;
236 bh = (regs->regs[60]) >> 32;
237 bl = (regs->regs[60]) & 0xffffffff;
238 ch = (regs->regs[61]) >> 32;
239 cl = (regs->regs[61]) & 0xffffffff;
240 printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n",
241 ah, al, bh, bl, ch, cl);
243 ah = (regs->regs[62]) >> 32;
244 al = (regs->regs[62]) & 0xffffffff;
245 bh = (regs->tregs[0]) >> 32;
246 bl = (regs->tregs[0]) & 0xffffffff;
247 ch = (regs->tregs[1]) >> 32;
248 cl = (regs->tregs[1]) & 0xffffffff;
249 printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n",
250 ah, al, bh, bl, ch, cl);
252 ah = (regs->tregs[2]) >> 32;
253 al = (regs->tregs[2]) & 0xffffffff;
254 bh = (regs->tregs[3]) >> 32;
255 bl = (regs->tregs[3]) & 0xffffffff;
256 ch = (regs->tregs[4]) >> 32;
257 cl = (regs->tregs[4]) & 0xffffffff;
258 printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n",
259 ah, al, bh, bl, ch, cl);
261 ah = (regs->tregs[5]) >> 32;
262 al = (regs->tregs[5]) & 0xffffffff;
263 bh = (regs->tregs[6]) >> 32;
264 bl = (regs->tregs[6]) & 0xffffffff;
265 ch = (regs->tregs[7]) >> 32;
266 cl = (regs->tregs[7]) & 0xffffffff;
267 printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n",
268 ah, al, bh, bl, ch, cl);
271 * If we're in kernel mode, dump the stack too..
273 if (!user_mode(regs)) {
274 void show_stack(struct task_struct *tsk, unsigned long *sp);
275 unsigned long sp = regs->regs[15] & 0xffffffff;
276 struct task_struct *tsk = get_current();
278 tsk->thread.kregs = regs;
280 show_stack(tsk, (unsigned long *)sp);
285 * Create a kernel thread
287 ATTRIB_NORET void kernel_thread_helper(void *arg, int (*fn)(void *))
293 * This is the mechanism for creating a new kernel thread.
295 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
296 * who haven't done an "execve()") should use this: it will work within
297 * a system call from a "real" process, but the process memory space will
298 * not be freed until both the parent and the child have exited.
300 int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
304 memset(®s, 0, sizeof(regs));
305 regs.regs[2] = (unsigned long)arg;
306 regs.regs[3] = (unsigned long)fn;
308 regs.pc = (unsigned long)kernel_thread_helper;
311 /* Ok, create the new process.. */
312 return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
313 ®s, 0, NULL, NULL);
315 EXPORT_SYMBOL(kernel_thread);
318 * Free current thread data structures etc..
320 void exit_thread(void)
323 * See arch/sparc/kernel/process.c for the precedent for doing
326 * The SH-5 FPU save/restore approach relies on
327 * last_task_used_math pointing to a live task_struct. When
328 * another task tries to use the FPU for the 1st time, the FPUDIS
329 * trap handling (see arch/sh/kernel/cpu/sh5/fpu.c) will save the
330 * existing FPU state to the FP regs field within
331 * last_task_used_math before re-loading the new task's FPU state
332 * (or initialising it if the FPU has been used before). So if
333 * last_task_used_math is stale, and its page has already been
334 * re-allocated for another use, the consequences are rather
335 * grim. Unless we null it here, there is no other path through
336 * which it would get safely nulled.
339 if (last_task_used_math == current) {
340 last_task_used_math = NULL;
345 void flush_thread(void)
348 /* Called by fs/exec.c (setup_new_exec) to remove traces of a
349 * previously running executable. */
351 if (last_task_used_math == current) {
352 last_task_used_math = NULL;
354 /* Force FPU state to be reinitialised after exec */
358 /* if we are a kernel thread, about to change to user thread,
361 if(current->thread.kregs==&fake_swapper_regs) {
362 current->thread.kregs =
363 ((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1);
364 current->thread.uregs = current->thread.kregs;
368 void release_thread(struct task_struct *dead_task)
373 /* Fill in the fpu structure for a core dump.. */
374 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
378 struct task_struct *tsk = current;
380 fpvalid = !!tsk_used_math(tsk);
382 if (current == last_task_used_math) {
386 last_task_used_math = 0;
390 memcpy(fpu, &tsk->thread.xstate->hardfpu, sizeof(*fpu));
395 return 0; /* Task didn't use the fpu at all. */
398 EXPORT_SYMBOL(dump_fpu);
400 asmlinkage void ret_from_fork(void);
402 int copy_thread(unsigned long clone_flags, unsigned long usp,
403 unsigned long unused,
404 struct task_struct *p, struct pt_regs *regs)
406 struct pt_regs *childregs;
409 if(last_task_used_math == current) {
413 last_task_used_math = NULL;
417 /* Copy from sh version */
418 childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1;
423 * Sign extend the edited stack.
424 * Note that thread.pc and thread.pc will stay
425 * 32-bit wide and context switch must take care
426 * of NEFF sign extension.
428 if (user_mode(regs)) {
429 childregs->regs[15] = neff_sign_extend(usp);
430 p->thread.uregs = childregs;
432 childregs->regs[15] =
433 neff_sign_extend((unsigned long)task_stack_page(p) +
437 childregs->regs[9] = 0; /* Set return value for child */
438 childregs->sr |= SR_FD; /* Invalidate FPU flag */
440 p->thread.sp = (unsigned long) childregs;
441 p->thread.pc = (unsigned long) ret_from_fork;
446 asmlinkage int sys_fork(unsigned long r2, unsigned long r3,
447 unsigned long r4, unsigned long r5,
448 unsigned long r6, unsigned long r7,
449 struct pt_regs *pregs)
451 return do_fork(SIGCHLD, pregs->regs[15], pregs, 0, 0, 0);
454 asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
455 unsigned long r4, unsigned long r5,
456 unsigned long r6, unsigned long r7,
457 struct pt_regs *pregs)
460 newsp = pregs->regs[15];
461 return do_fork(clone_flags, newsp, pregs, 0, 0, 0);
465 * This is trivial, and on the face of it looks like it
466 * could equally well be done in user mode.
468 * Not so, for quite unobvious reasons - register pressure.
469 * In user mode vfork() cannot have a stack frame, and if
470 * done by calling the "clone()" system call directly, you
471 * do not have enough call-clobbered registers to hold all
472 * the information you need.
474 asmlinkage int sys_vfork(unsigned long r2, unsigned long r3,
475 unsigned long r4, unsigned long r5,
476 unsigned long r6, unsigned long r7,
477 struct pt_regs *pregs)
479 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, pregs->regs[15], pregs, 0, 0, 0);
483 * sys_execve() executes a new program.
485 asmlinkage int sys_execve(char *ufilename, char **uargv,
486 char **uenvp, unsigned long r5,
487 unsigned long r6, unsigned long r7,
488 struct pt_regs *pregs)
493 filename = getname((char __user *)ufilename);
494 error = PTR_ERR(filename);
495 if (IS_ERR(filename))
498 error = do_execve(filename,
499 (char __user * __user *)uargv,
500 (char __user * __user *)uenvp,
508 * These bracket the sleeping functions..
510 extern void interruptible_sleep_on(wait_queue_head_t *q);
512 #define mid_sched ((unsigned long) interruptible_sleep_on)
514 #ifdef CONFIG_FRAME_POINTER
515 static int in_sh64_switch_to(unsigned long pc)
517 extern char __sh64_switch_to_end;
518 /* For a sleeping task, the PC is somewhere in the middle of the function,
519 so we don't have to worry about masking the LSB off */
520 return (pc >= (unsigned long) sh64_switch_to) &&
521 (pc < (unsigned long) &__sh64_switch_to_end);
525 unsigned long get_wchan(struct task_struct *p)
529 if (!p || p == current || p->state == TASK_RUNNING)
533 * The same comment as on the Alpha applies here, too ...
535 pc = thread_saved_pc(p);
537 #ifdef CONFIG_FRAME_POINTER
538 if (in_sh64_switch_to(pc)) {
539 unsigned long schedule_fp;
540 unsigned long sh64_switch_to_fp;
541 unsigned long schedule_caller_pc;
543 sh64_switch_to_fp = (long) p->thread.sp;
544 /* r14 is saved at offset 4 in the sh64_switch_to frame */
545 schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4);
547 /* and the caller of 'schedule' is (currently!) saved at offset 24
548 in the frame of schedule (from disasm) */
549 schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24);
550 return schedule_caller_pc;