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Commit | Line | Data |
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aec5e0e1 PM |
1 | /* |
2 | * arch/sh/kernel/process.c | |
1da177e4 | 3 | * |
aec5e0e1 | 4 | * This file handles the architecture-dependent parts of process handling.. |
1da177e4 LT |
5 | * |
6 | * Copyright (C) 1995 Linus Torvalds | |
7 | * | |
8 | * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima | |
8ae91b9a | 9 | * Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC |
e7ab3cd2 PM |
10 | * Copyright (C) 2002 - 2008 Paul Mundt |
11 | * | |
12 | * This file is subject to the terms and conditions of the GNU General Public | |
13 | * License. See the file "COPYING" in the main directory of this archive | |
14 | * for more details. | |
1da177e4 | 15 | */ |
1da177e4 | 16 | #include <linux/module.h> |
1da177e4 LT |
17 | #include <linux/mm.h> |
18 | #include <linux/elfcore.h> | |
a3310bbd | 19 | #include <linux/pm.h> |
1da177e4 | 20 | #include <linux/kallsyms.h> |
a3310bbd | 21 | #include <linux/kexec.h> |
b118ca57 | 22 | #include <linux/kdebug.h> |
57be2b48 | 23 | #include <linux/tick.h> |
e08f457c | 24 | #include <linux/reboot.h> |
e06c4e57 | 25 | #include <linux/fs.h> |
995bb781 | 26 | #include <linux/preempt.h> |
1da177e4 LT |
27 | #include <asm/uaccess.h> |
28 | #include <asm/mmu_context.h> | |
5f8c9908 | 29 | #include <asm/pgalloc.h> |
bd079997 | 30 | #include <asm/system.h> |
b5233d07 | 31 | #include <asm/ubc.h> |
9bbafce2 | 32 | #include <asm/fpu.h> |
fa43972f | 33 | #include <asm/syscalls.h> |
1da177e4 | 34 | |
1da177e4 LT |
35 | int ubc_usercnt = 0; |
36 | ||
1da177e4 LT |
37 | void machine_restart(char * __unused) |
38 | { | |
39 | /* SR.BL=1 and invoke address error to let CPU reset (manual reset) */ | |
40 | asm volatile("ldc %0, sr\n\t" | |
41 | "mov.l @%1, %0" : : "r" (0x10000000), "r" (0x80000001)); | |
42 | } | |
43 | ||
1da177e4 LT |
44 | void machine_halt(void) |
45 | { | |
a3310bbd | 46 | local_irq_disable(); |
1da177e4 | 47 | |
1da177e4 LT |
48 | while (1) |
49 | cpu_sleep(); | |
50 | } | |
51 | ||
1da177e4 LT |
52 | void machine_power_off(void) |
53 | { | |
a3310bbd PM |
54 | if (pm_power_off) |
55 | pm_power_off(); | |
1da177e4 LT |
56 | } |
57 | ||
1da177e4 LT |
58 | void show_regs(struct pt_regs * regs) |
59 | { | |
60 | printk("\n"); | |
75fd24c1 PM |
61 | printk("Pid : %d, Comm: \t\t%s\n", task_pid_nr(current), current->comm); |
62 | printk("CPU : %d \t\t%s (%s %.*s)\n\n", | |
7d96169c PM |
63 | smp_processor_id(), print_tainted(), init_utsname()->release, |
64 | (int)strcspn(init_utsname()->version, " "), | |
65 | init_utsname()->version); | |
66 | ||
6b002230 | 67 | print_symbol("PC is at %s\n", instruction_pointer(regs)); |
7d96169c PM |
68 | print_symbol("PR is at %s\n", regs->pr); |
69 | ||
1da177e4 LT |
70 | printk("PC : %08lx SP : %08lx SR : %08lx ", |
71 | regs->pc, regs->regs[15], regs->sr); | |
72 | #ifdef CONFIG_MMU | |
7d96169c | 73 | printk("TEA : %08x\n", ctrl_inl(MMU_TEA)); |
1da177e4 | 74 | #else |
7d96169c | 75 | printk("\n"); |
1da177e4 | 76 | #endif |
1da177e4 LT |
77 | |
78 | printk("R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n", | |
79 | regs->regs[0],regs->regs[1], | |
80 | regs->regs[2],regs->regs[3]); | |
81 | printk("R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n", | |
82 | regs->regs[4],regs->regs[5], | |
83 | regs->regs[6],regs->regs[7]); | |
84 | printk("R8 : %08lx R9 : %08lx R10 : %08lx R11 : %08lx\n", | |
85 | regs->regs[8],regs->regs[9], | |
86 | regs->regs[10],regs->regs[11]); | |
87 | printk("R12 : %08lx R13 : %08lx R14 : %08lx\n", | |
88 | regs->regs[12],regs->regs[13], | |
89 | regs->regs[14]); | |
90 | printk("MACH: %08lx MACL: %08lx GBR : %08lx PR : %08lx\n", | |
91 | regs->mach, regs->macl, regs->gbr, regs->pr); | |
92 | ||
6b002230 | 93 | show_trace(NULL, (unsigned long *)regs->regs[15], regs); |
9cfc9a9b | 94 | show_code(regs); |
1da177e4 LT |
95 | } |
96 | ||
97 | /* | |
98 | * Create a kernel thread | |
99 | */ | |
43f8f9b9 PM |
100 | ATTRIB_NORET void kernel_thread_helper(void *arg, int (*fn)(void *)) |
101 | { | |
102 | do_exit(fn(arg)); | |
103 | } | |
1da177e4 | 104 | |
aec5e0e1 | 105 | /* Don't use this in BL=1(cli). Or else, CPU resets! */ |
1da177e4 | 106 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) |
aec5e0e1 | 107 | { |
1da177e4 | 108 | struct pt_regs regs; |
3d58695e | 109 | int pid; |
1da177e4 LT |
110 | |
111 | memset(®s, 0, sizeof(regs)); | |
aec5e0e1 PM |
112 | regs.regs[4] = (unsigned long)arg; |
113 | regs.regs[5] = (unsigned long)fn; | |
1da177e4 | 114 | |
aec5e0e1 | 115 | regs.pc = (unsigned long)kernel_thread_helper; |
1da177e4 LT |
116 | regs.sr = (1 << 30); |
117 | ||
118 | /* Ok, create the new process.. */ | |
3d58695e PM |
119 | pid = do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, |
120 | ®s, 0, NULL, NULL); | |
121 | ||
122 | trace_mark(kernel_arch_kthread_create, "pid %d fn %p", pid, fn); | |
123 | ||
124 | return pid; | |
1da177e4 LT |
125 | } |
126 | ||
127 | /* | |
128 | * Free current thread data structures etc.. | |
129 | */ | |
130 | void exit_thread(void) | |
131 | { | |
132 | if (current->thread.ubc_pc) { | |
133 | current->thread.ubc_pc = 0; | |
134 | ubc_usercnt -= 1; | |
135 | } | |
136 | } | |
137 | ||
138 | void flush_thread(void) | |
139 | { | |
140 | #if defined(CONFIG_SH_FPU) | |
141 | struct task_struct *tsk = current; | |
1da177e4 | 142 | /* Forget lazy FPU state */ |
3cf0f4ec | 143 | clear_fpu(tsk, task_pt_regs(tsk)); |
1da177e4 LT |
144 | clear_used_math(); |
145 | #endif | |
146 | } | |
147 | ||
148 | void release_thread(struct task_struct *dead_task) | |
149 | { | |
150 | /* do nothing */ | |
151 | } | |
152 | ||
153 | /* Fill in the fpu structure for a core dump.. */ | |
154 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
155 | { | |
156 | int fpvalid = 0; | |
157 | ||
158 | #if defined(CONFIG_SH_FPU) | |
159 | struct task_struct *tsk = current; | |
160 | ||
161 | fpvalid = !!tsk_used_math(tsk); | |
e7ab3cd2 PM |
162 | if (fpvalid) |
163 | fpvalid = !fpregs_get(tsk, NULL, 0, | |
164 | sizeof(struct user_fpu_struct), | |
165 | fpu, NULL); | |
1da177e4 LT |
166 | #endif |
167 | ||
168 | return fpvalid; | |
169 | } | |
170 | ||
171 | asmlinkage void ret_from_fork(void); | |
172 | ||
173 | int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, | |
174 | unsigned long unused, | |
175 | struct task_struct *p, struct pt_regs *regs) | |
176 | { | |
2991be72 | 177 | struct thread_info *ti = task_thread_info(p); |
1da177e4 LT |
178 | struct pt_regs *childregs; |
179 | #if defined(CONFIG_SH_FPU) | |
180 | struct task_struct *tsk = current; | |
181 | ||
182 | unlazy_fpu(tsk, regs); | |
183 | p->thread.fpu = tsk->thread.fpu; | |
184 | copy_to_stopped_child_used_math(p); | |
185 | #endif | |
186 | ||
3cf0f4ec | 187 | childregs = task_pt_regs(p); |
1da177e4 LT |
188 | *childregs = *regs; |
189 | ||
190 | if (user_mode(regs)) { | |
191 | childregs->regs[15] = usp; | |
2991be72 | 192 | ti->addr_limit = USER_DS; |
1da177e4 | 193 | } else { |
e6bcf562 | 194 | childregs->regs[15] = (unsigned long)childregs; |
2991be72 | 195 | ti->addr_limit = KERNEL_DS; |
1da177e4 | 196 | } |
aec5e0e1 | 197 | |
e6bcf562 | 198 | if (clone_flags & CLONE_SETTLS) |
1da177e4 | 199 | childregs->gbr = childregs->regs[0]; |
aec5e0e1 | 200 | |
1da177e4 LT |
201 | childregs->regs[0] = 0; /* Set return value for child */ |
202 | ||
203 | p->thread.sp = (unsigned long) childregs; | |
204 | p->thread.pc = (unsigned long) ret_from_fork; | |
205 | ||
206 | p->thread.ubc_pc = 0; | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
1da177e4 | 211 | /* Tracing by user break controller. */ |
aec5e0e1 | 212 | static void ubc_set_tracing(int asid, unsigned long pc) |
1da177e4 | 213 | { |
8ae91b9a RS |
214 | #if defined(CONFIG_CPU_SH4A) |
215 | unsigned long val; | |
216 | ||
217 | val = (UBC_CBR_ID_INST | UBC_CBR_RW_READ | UBC_CBR_CE); | |
218 | val |= (UBC_CBR_AIE | UBC_CBR_AIV_SET(asid)); | |
219 | ||
220 | ctrl_outl(val, UBC_CBR0); | |
221 | ctrl_outl(pc, UBC_CAR0); | |
222 | ctrl_outl(0x0, UBC_CAMR0); | |
223 | ctrl_outl(0x0, UBC_CBCR); | |
224 | ||
225 | val = (UBC_CRR_RES | UBC_CRR_PCB | UBC_CRR_BIE); | |
226 | ctrl_outl(val, UBC_CRR0); | |
227 | ||
aec5e0e1 | 228 | /* Read UBC register that we wrote last, for checking update */ |
8ae91b9a RS |
229 | val = ctrl_inl(UBC_CRR0); |
230 | ||
231 | #else /* CONFIG_CPU_SH4A */ | |
1da177e4 LT |
232 | ctrl_outl(pc, UBC_BARA); |
233 | ||
a2d1a5fa | 234 | #ifdef CONFIG_MMU |
357d5946 | 235 | ctrl_outb(asid, UBC_BASRA); |
a2d1a5fa | 236 | #endif |
1da177e4 LT |
237 | |
238 | ctrl_outl(0, UBC_BAMRA); | |
239 | ||
11c19656 | 240 | if (current_cpu_data.type == CPU_SH7729 || |
3a2e117e PM |
241 | current_cpu_data.type == CPU_SH7710 || |
242 | current_cpu_data.type == CPU_SH7712) { | |
1da177e4 LT |
243 | ctrl_outw(BBR_INST | BBR_READ | BBR_CPU, UBC_BBRA); |
244 | ctrl_outl(BRCR_PCBA | BRCR_PCTE, UBC_BRCR); | |
245 | } else { | |
246 | ctrl_outw(BBR_INST | BBR_READ, UBC_BBRA); | |
247 | ctrl_outw(BRCR_PCBA, UBC_BRCR); | |
248 | } | |
8ae91b9a | 249 | #endif /* CONFIG_CPU_SH4A */ |
1da177e4 LT |
250 | } |
251 | ||
252 | /* | |
253 | * switch_to(x,y) should switch tasks from x to y. | |
254 | * | |
255 | */ | |
aec5e0e1 PM |
256 | struct task_struct *__switch_to(struct task_struct *prev, |
257 | struct task_struct *next) | |
1da177e4 LT |
258 | { |
259 | #if defined(CONFIG_SH_FPU) | |
3cf0f4ec | 260 | unlazy_fpu(prev, task_pt_regs(prev)); |
1da177e4 LT |
261 | #endif |
262 | ||
a2d1a5fa | 263 | #ifdef CONFIG_MMU |
1da177e4 LT |
264 | /* |
265 | * Restore the kernel mode register | |
aec5e0e1 | 266 | * k7 (r7_bank1) |
1da177e4 LT |
267 | */ |
268 | asm volatile("ldc %0, r7_bank" | |
269 | : /* no output */ | |
cafcfcaa | 270 | : "r" (task_thread_info(next))); |
a2d1a5fa | 271 | #endif |
1da177e4 | 272 | |
1da177e4 LT |
273 | /* If no tasks are using the UBC, we're done */ |
274 | if (ubc_usercnt == 0) | |
275 | /* If no tasks are using the UBC, we're done */; | |
276 | else if (next->thread.ubc_pc && next->mm) { | |
a2d1a5fa YS |
277 | int asid = 0; |
278 | #ifdef CONFIG_MMU | |
aec5e0e1 | 279 | asid |= cpu_asid(smp_processor_id(), next->mm); |
a2d1a5fa YS |
280 | #endif |
281 | ubc_set_tracing(asid, next->thread.ubc_pc); | |
1da177e4 | 282 | } else { |
8ae91b9a RS |
283 | #if defined(CONFIG_CPU_SH4A) |
284 | ctrl_outl(UBC_CBR_INIT, UBC_CBR0); | |
285 | ctrl_outl(UBC_CRR_INIT, UBC_CRR0); | |
286 | #else | |
1da177e4 LT |
287 | ctrl_outw(0, UBC_BBRA); |
288 | ctrl_outw(0, UBC_BBRB); | |
8ae91b9a | 289 | #endif |
1da177e4 | 290 | } |
1da177e4 LT |
291 | |
292 | return prev; | |
293 | } | |
294 | ||
295 | asmlinkage int sys_fork(unsigned long r4, unsigned long r5, | |
296 | unsigned long r6, unsigned long r7, | |
f0bc814c | 297 | struct pt_regs __regs) |
1da177e4 LT |
298 | { |
299 | #ifdef CONFIG_MMU | |
882c12c4 | 300 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
f0bc814c | 301 | return do_fork(SIGCHLD, regs->regs[15], regs, 0, NULL, NULL); |
1da177e4 LT |
302 | #else |
303 | /* fork almost works, enough to trick you into looking elsewhere :-( */ | |
304 | return -EINVAL; | |
305 | #endif | |
306 | } | |
307 | ||
308 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
309 | unsigned long parent_tidptr, | |
310 | unsigned long child_tidptr, | |
f0bc814c | 311 | struct pt_regs __regs) |
1da177e4 | 312 | { |
f0bc814c | 313 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
1da177e4 | 314 | if (!newsp) |
f0bc814c SM |
315 | newsp = regs->regs[15]; |
316 | return do_fork(clone_flags, newsp, regs, 0, | |
aec5e0e1 PM |
317 | (int __user *)parent_tidptr, |
318 | (int __user *)child_tidptr); | |
1da177e4 LT |
319 | } |
320 | ||
321 | /* | |
322 | * This is trivial, and on the face of it looks like it | |
323 | * could equally well be done in user mode. | |
324 | * | |
325 | * Not so, for quite unobvious reasons - register pressure. | |
326 | * In user mode vfork() cannot have a stack frame, and if | |
327 | * done by calling the "clone()" system call directly, you | |
328 | * do not have enough call-clobbered registers to hold all | |
329 | * the information you need. | |
330 | */ | |
331 | asmlinkage int sys_vfork(unsigned long r4, unsigned long r5, | |
332 | unsigned long r6, unsigned long r7, | |
f0bc814c | 333 | struct pt_regs __regs) |
1da177e4 | 334 | { |
f0bc814c SM |
335 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
336 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->regs[15], regs, | |
1da177e4 LT |
337 | 0, NULL, NULL); |
338 | } | |
339 | ||
340 | /* | |
341 | * sys_execve() executes a new program. | |
342 | */ | |
e08f457c PM |
343 | asmlinkage int sys_execve(char __user *ufilename, char __user * __user *uargv, |
344 | char __user * __user *uenvp, unsigned long r7, | |
f0bc814c | 345 | struct pt_regs __regs) |
1da177e4 | 346 | { |
f0bc814c | 347 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
1da177e4 LT |
348 | int error; |
349 | char *filename; | |
350 | ||
e08f457c | 351 | filename = getname(ufilename); |
1da177e4 LT |
352 | error = PTR_ERR(filename); |
353 | if (IS_ERR(filename)) | |
354 | goto out; | |
355 | ||
e08f457c | 356 | error = do_execve(filename, uargv, uenvp, regs); |
1da177e4 LT |
357 | if (error == 0) { |
358 | task_lock(current); | |
359 | current->ptrace &= ~PT_DTRACE; | |
360 | task_unlock(current); | |
361 | } | |
362 | putname(filename); | |
363 | out: | |
364 | return error; | |
365 | } | |
366 | ||
367 | unsigned long get_wchan(struct task_struct *p) | |
368 | { | |
1da177e4 LT |
369 | unsigned long pc; |
370 | ||
371 | if (!p || p == current || p->state == TASK_RUNNING) | |
372 | return 0; | |
373 | ||
374 | /* | |
375 | * The same comment as on the Alpha applies here, too ... | |
376 | */ | |
377 | pc = thread_saved_pc(p); | |
c64ac9f0 DM |
378 | |
379 | #ifdef CONFIG_FRAME_POINTER | |
1da177e4 | 380 | if (in_sched_functions(pc)) { |
c64ac9f0 | 381 | unsigned long schedule_frame = (unsigned long)p->thread.sp; |
b652c23c | 382 | return ((unsigned long *)schedule_frame)[21]; |
1da177e4 | 383 | } |
c64ac9f0 | 384 | #endif |
b652c23c | 385 | |
1da177e4 LT |
386 | return pc; |
387 | } | |
388 | ||
f0bc814c | 389 | asmlinkage void break_point_trap(void) |
1da177e4 LT |
390 | { |
391 | /* Clear tracing. */ | |
8ae91b9a RS |
392 | #if defined(CONFIG_CPU_SH4A) |
393 | ctrl_outl(UBC_CBR_INIT, UBC_CBR0); | |
394 | ctrl_outl(UBC_CRR_INIT, UBC_CRR0); | |
395 | #else | |
1da177e4 LT |
396 | ctrl_outw(0, UBC_BBRA); |
397 | ctrl_outw(0, UBC_BBRB); | |
8ae91b9a | 398 | #endif |
1da177e4 LT |
399 | current->thread.ubc_pc = 0; |
400 | ubc_usercnt -= 1; | |
401 | ||
402 | force_sig(SIGTRAP, current); | |
403 | } |