Commit | Line | Data |
---|---|---|
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> |
7816fecd | 26 | #include <linux/ftrace.h> |
995bb781 | 27 | #include <linux/preempt.h> |
1da177e4 LT |
28 | #include <asm/uaccess.h> |
29 | #include <asm/mmu_context.h> | |
5f8c9908 | 30 | #include <asm/pgalloc.h> |
bd079997 | 31 | #include <asm/system.h> |
b5233d07 | 32 | #include <asm/ubc.h> |
9bbafce2 | 33 | #include <asm/fpu.h> |
fa43972f | 34 | #include <asm/syscalls.h> |
b46373e0 | 35 | #include <asm/watchdog.h> |
1da177e4 | 36 | |
1da177e4 LT |
37 | int ubc_usercnt = 0; |
38 | ||
b46373e0 JF |
39 | #ifdef CONFIG_32BIT |
40 | static void watchdog_trigger_immediate(void) | |
41 | { | |
42 | sh_wdt_write_cnt(0xFF); | |
43 | sh_wdt_write_csr(0xC2); | |
44 | } | |
45 | ||
46 | void machine_restart(char * __unused) | |
47 | { | |
48 | local_irq_disable(); | |
49 | ||
50 | /* Use watchdog timer to trigger reset */ | |
51 | watchdog_trigger_immediate(); | |
52 | ||
53 | while (1) | |
54 | cpu_sleep(); | |
55 | } | |
56 | #else | |
1da177e4 LT |
57 | void machine_restart(char * __unused) |
58 | { | |
59 | /* SR.BL=1 and invoke address error to let CPU reset (manual reset) */ | |
60 | asm volatile("ldc %0, sr\n\t" | |
61 | "mov.l @%1, %0" : : "r" (0x10000000), "r" (0x80000001)); | |
62 | } | |
b46373e0 | 63 | #endif |
1da177e4 | 64 | |
1da177e4 LT |
65 | void machine_halt(void) |
66 | { | |
a3310bbd | 67 | local_irq_disable(); |
1da177e4 | 68 | |
1da177e4 LT |
69 | while (1) |
70 | cpu_sleep(); | |
71 | } | |
72 | ||
1da177e4 LT |
73 | void machine_power_off(void) |
74 | { | |
a3310bbd PM |
75 | if (pm_power_off) |
76 | pm_power_off(); | |
1da177e4 LT |
77 | } |
78 | ||
1da177e4 LT |
79 | void show_regs(struct pt_regs * regs) |
80 | { | |
81 | printk("\n"); | |
75fd24c1 PM |
82 | printk("Pid : %d, Comm: \t\t%s\n", task_pid_nr(current), current->comm); |
83 | printk("CPU : %d \t\t%s (%s %.*s)\n\n", | |
7d96169c PM |
84 | smp_processor_id(), print_tainted(), init_utsname()->release, |
85 | (int)strcspn(init_utsname()->version, " "), | |
86 | init_utsname()->version); | |
87 | ||
6b002230 | 88 | print_symbol("PC is at %s\n", instruction_pointer(regs)); |
7d96169c PM |
89 | print_symbol("PR is at %s\n", regs->pr); |
90 | ||
1da177e4 LT |
91 | printk("PC : %08lx SP : %08lx SR : %08lx ", |
92 | regs->pc, regs->regs[15], regs->sr); | |
93 | #ifdef CONFIG_MMU | |
7d96169c | 94 | printk("TEA : %08x\n", ctrl_inl(MMU_TEA)); |
1da177e4 | 95 | #else |
7d96169c | 96 | printk("\n"); |
1da177e4 | 97 | #endif |
1da177e4 LT |
98 | |
99 | printk("R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n", | |
100 | regs->regs[0],regs->regs[1], | |
101 | regs->regs[2],regs->regs[3]); | |
102 | printk("R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n", | |
103 | regs->regs[4],regs->regs[5], | |
104 | regs->regs[6],regs->regs[7]); | |
105 | printk("R8 : %08lx R9 : %08lx R10 : %08lx R11 : %08lx\n", | |
106 | regs->regs[8],regs->regs[9], | |
107 | regs->regs[10],regs->regs[11]); | |
108 | printk("R12 : %08lx R13 : %08lx R14 : %08lx\n", | |
109 | regs->regs[12],regs->regs[13], | |
110 | regs->regs[14]); | |
111 | printk("MACH: %08lx MACL: %08lx GBR : %08lx PR : %08lx\n", | |
112 | regs->mach, regs->macl, regs->gbr, regs->pr); | |
113 | ||
6b002230 | 114 | show_trace(NULL, (unsigned long *)regs->regs[15], regs); |
9cfc9a9b | 115 | show_code(regs); |
1da177e4 LT |
116 | } |
117 | ||
118 | /* | |
119 | * Create a kernel thread | |
120 | */ | |
43f8f9b9 PM |
121 | ATTRIB_NORET void kernel_thread_helper(void *arg, int (*fn)(void *)) |
122 | { | |
123 | do_exit(fn(arg)); | |
124 | } | |
1da177e4 | 125 | |
aec5e0e1 | 126 | /* Don't use this in BL=1(cli). Or else, CPU resets! */ |
1da177e4 | 127 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) |
aec5e0e1 | 128 | { |
1da177e4 | 129 | struct pt_regs regs; |
3d58695e | 130 | int pid; |
1da177e4 LT |
131 | |
132 | memset(®s, 0, sizeof(regs)); | |
aec5e0e1 PM |
133 | regs.regs[4] = (unsigned long)arg; |
134 | regs.regs[5] = (unsigned long)fn; | |
1da177e4 | 135 | |
aec5e0e1 | 136 | regs.pc = (unsigned long)kernel_thread_helper; |
1da177e4 LT |
137 | regs.sr = (1 << 30); |
138 | ||
139 | /* Ok, create the new process.. */ | |
3d58695e PM |
140 | pid = do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, |
141 | ®s, 0, NULL, NULL); | |
142 | ||
3d58695e | 143 | return pid; |
1da177e4 LT |
144 | } |
145 | ||
146 | /* | |
147 | * Free current thread data structures etc.. | |
148 | */ | |
149 | void exit_thread(void) | |
150 | { | |
151 | if (current->thread.ubc_pc) { | |
152 | current->thread.ubc_pc = 0; | |
153 | ubc_usercnt -= 1; | |
154 | } | |
155 | } | |
156 | ||
157 | void flush_thread(void) | |
158 | { | |
159 | #if defined(CONFIG_SH_FPU) | |
160 | struct task_struct *tsk = current; | |
1da177e4 | 161 | /* Forget lazy FPU state */ |
3cf0f4ec | 162 | clear_fpu(tsk, task_pt_regs(tsk)); |
1da177e4 LT |
163 | clear_used_math(); |
164 | #endif | |
165 | } | |
166 | ||
167 | void release_thread(struct task_struct *dead_task) | |
168 | { | |
169 | /* do nothing */ | |
170 | } | |
171 | ||
172 | /* Fill in the fpu structure for a core dump.. */ | |
173 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
174 | { | |
175 | int fpvalid = 0; | |
176 | ||
177 | #if defined(CONFIG_SH_FPU) | |
178 | struct task_struct *tsk = current; | |
179 | ||
180 | fpvalid = !!tsk_used_math(tsk); | |
e7ab3cd2 PM |
181 | if (fpvalid) |
182 | fpvalid = !fpregs_get(tsk, NULL, 0, | |
183 | sizeof(struct user_fpu_struct), | |
184 | fpu, NULL); | |
1da177e4 LT |
185 | #endif |
186 | ||
187 | return fpvalid; | |
188 | } | |
189 | ||
190 | asmlinkage void ret_from_fork(void); | |
191 | ||
6f2c55b8 | 192 | int copy_thread(unsigned long clone_flags, unsigned long usp, |
1da177e4 LT |
193 | unsigned long unused, |
194 | struct task_struct *p, struct pt_regs *regs) | |
195 | { | |
2991be72 | 196 | struct thread_info *ti = task_thread_info(p); |
1da177e4 | 197 | struct pt_regs *childregs; |
01ab1039 | 198 | #if defined(CONFIG_SH_FPU) || defined(CONFIG_SH_DSP) |
1da177e4 | 199 | struct task_struct *tsk = current; |
01ab1039 | 200 | #endif |
1da177e4 | 201 | |
01ab1039 | 202 | #if defined(CONFIG_SH_FPU) |
1da177e4 LT |
203 | unlazy_fpu(tsk, regs); |
204 | p->thread.fpu = tsk->thread.fpu; | |
205 | copy_to_stopped_child_used_math(p); | |
206 | #endif | |
207 | ||
01ab1039 MT |
208 | #if defined(CONFIG_SH_DSP) |
209 | if (is_dsp_enabled(tsk)) { | |
210 | /* We can use the __save_dsp or just copy the struct: | |
211 | * __save_dsp(p); | |
212 | * p->thread.dsp_status.status |= SR_DSP | |
213 | */ | |
214 | p->thread.dsp_status = tsk->thread.dsp_status; | |
215 | } | |
216 | #endif | |
217 | ||
3cf0f4ec | 218 | childregs = task_pt_regs(p); |
1da177e4 LT |
219 | *childregs = *regs; |
220 | ||
221 | if (user_mode(regs)) { | |
222 | childregs->regs[15] = usp; | |
2991be72 | 223 | ti->addr_limit = USER_DS; |
1da177e4 | 224 | } else { |
e6bcf562 | 225 | childregs->regs[15] = (unsigned long)childregs; |
2991be72 | 226 | ti->addr_limit = KERNEL_DS; |
1da177e4 | 227 | } |
aec5e0e1 | 228 | |
e6bcf562 | 229 | if (clone_flags & CLONE_SETTLS) |
1da177e4 | 230 | childregs->gbr = childregs->regs[0]; |
aec5e0e1 | 231 | |
1da177e4 LT |
232 | childregs->regs[0] = 0; /* Set return value for child */ |
233 | ||
234 | p->thread.sp = (unsigned long) childregs; | |
235 | p->thread.pc = (unsigned long) ret_from_fork; | |
236 | ||
237 | p->thread.ubc_pc = 0; | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
1da177e4 | 242 | /* Tracing by user break controller. */ |
aec5e0e1 | 243 | static void ubc_set_tracing(int asid, unsigned long pc) |
1da177e4 | 244 | { |
8ae91b9a RS |
245 | #if defined(CONFIG_CPU_SH4A) |
246 | unsigned long val; | |
247 | ||
248 | val = (UBC_CBR_ID_INST | UBC_CBR_RW_READ | UBC_CBR_CE); | |
249 | val |= (UBC_CBR_AIE | UBC_CBR_AIV_SET(asid)); | |
250 | ||
251 | ctrl_outl(val, UBC_CBR0); | |
252 | ctrl_outl(pc, UBC_CAR0); | |
253 | ctrl_outl(0x0, UBC_CAMR0); | |
254 | ctrl_outl(0x0, UBC_CBCR); | |
255 | ||
256 | val = (UBC_CRR_RES | UBC_CRR_PCB | UBC_CRR_BIE); | |
257 | ctrl_outl(val, UBC_CRR0); | |
258 | ||
aec5e0e1 | 259 | /* Read UBC register that we wrote last, for checking update */ |
8ae91b9a RS |
260 | val = ctrl_inl(UBC_CRR0); |
261 | ||
262 | #else /* CONFIG_CPU_SH4A */ | |
1da177e4 LT |
263 | ctrl_outl(pc, UBC_BARA); |
264 | ||
a2d1a5fa | 265 | #ifdef CONFIG_MMU |
357d5946 | 266 | ctrl_outb(asid, UBC_BASRA); |
a2d1a5fa | 267 | #endif |
1da177e4 LT |
268 | |
269 | ctrl_outl(0, UBC_BAMRA); | |
270 | ||
11c19656 | 271 | if (current_cpu_data.type == CPU_SH7729 || |
3a2e117e | 272 | current_cpu_data.type == CPU_SH7710 || |
e73173db KB |
273 | current_cpu_data.type == CPU_SH7712 || |
274 | current_cpu_data.type == CPU_SH7203){ | |
1da177e4 LT |
275 | ctrl_outw(BBR_INST | BBR_READ | BBR_CPU, UBC_BBRA); |
276 | ctrl_outl(BRCR_PCBA | BRCR_PCTE, UBC_BRCR); | |
277 | } else { | |
278 | ctrl_outw(BBR_INST | BBR_READ, UBC_BBRA); | |
279 | ctrl_outw(BRCR_PCBA, UBC_BRCR); | |
280 | } | |
8ae91b9a | 281 | #endif /* CONFIG_CPU_SH4A */ |
1da177e4 LT |
282 | } |
283 | ||
284 | /* | |
285 | * switch_to(x,y) should switch tasks from x to y. | |
286 | * | |
287 | */ | |
7816fecd MF |
288 | __notrace_funcgraph struct task_struct * |
289 | __switch_to(struct task_struct *prev, struct task_struct *next) | |
1da177e4 LT |
290 | { |
291 | #if defined(CONFIG_SH_FPU) | |
3cf0f4ec | 292 | unlazy_fpu(prev, task_pt_regs(prev)); |
1da177e4 LT |
293 | #endif |
294 | ||
a2d1a5fa | 295 | #ifdef CONFIG_MMU |
1da177e4 LT |
296 | /* |
297 | * Restore the kernel mode register | |
aec5e0e1 | 298 | * k7 (r7_bank1) |
1da177e4 LT |
299 | */ |
300 | asm volatile("ldc %0, r7_bank" | |
301 | : /* no output */ | |
cafcfcaa | 302 | : "r" (task_thread_info(next))); |
a2d1a5fa | 303 | #endif |
1da177e4 | 304 | |
1da177e4 LT |
305 | /* If no tasks are using the UBC, we're done */ |
306 | if (ubc_usercnt == 0) | |
307 | /* If no tasks are using the UBC, we're done */; | |
308 | else if (next->thread.ubc_pc && next->mm) { | |
a2d1a5fa YS |
309 | int asid = 0; |
310 | #ifdef CONFIG_MMU | |
aec5e0e1 | 311 | asid |= cpu_asid(smp_processor_id(), next->mm); |
a2d1a5fa YS |
312 | #endif |
313 | ubc_set_tracing(asid, next->thread.ubc_pc); | |
1da177e4 | 314 | } else { |
8ae91b9a RS |
315 | #if defined(CONFIG_CPU_SH4A) |
316 | ctrl_outl(UBC_CBR_INIT, UBC_CBR0); | |
317 | ctrl_outl(UBC_CRR_INIT, UBC_CRR0); | |
318 | #else | |
1da177e4 LT |
319 | ctrl_outw(0, UBC_BBRA); |
320 | ctrl_outw(0, UBC_BBRB); | |
8ae91b9a | 321 | #endif |
1da177e4 | 322 | } |
1da177e4 LT |
323 | |
324 | return prev; | |
325 | } | |
326 | ||
327 | asmlinkage int sys_fork(unsigned long r4, unsigned long r5, | |
328 | unsigned long r6, unsigned long r7, | |
f0bc814c | 329 | struct pt_regs __regs) |
1da177e4 LT |
330 | { |
331 | #ifdef CONFIG_MMU | |
882c12c4 | 332 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
f0bc814c | 333 | return do_fork(SIGCHLD, regs->regs[15], regs, 0, NULL, NULL); |
1da177e4 LT |
334 | #else |
335 | /* fork almost works, enough to trick you into looking elsewhere :-( */ | |
336 | return -EINVAL; | |
337 | #endif | |
338 | } | |
339 | ||
340 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
341 | unsigned long parent_tidptr, | |
342 | unsigned long child_tidptr, | |
f0bc814c | 343 | struct pt_regs __regs) |
1da177e4 | 344 | { |
f0bc814c | 345 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
1da177e4 | 346 | if (!newsp) |
f0bc814c SM |
347 | newsp = regs->regs[15]; |
348 | return do_fork(clone_flags, newsp, regs, 0, | |
aec5e0e1 PM |
349 | (int __user *)parent_tidptr, |
350 | (int __user *)child_tidptr); | |
1da177e4 LT |
351 | } |
352 | ||
353 | /* | |
354 | * This is trivial, and on the face of it looks like it | |
355 | * could equally well be done in user mode. | |
356 | * | |
357 | * Not so, for quite unobvious reasons - register pressure. | |
358 | * In user mode vfork() cannot have a stack frame, and if | |
359 | * done by calling the "clone()" system call directly, you | |
360 | * do not have enough call-clobbered registers to hold all | |
361 | * the information you need. | |
362 | */ | |
363 | asmlinkage int sys_vfork(unsigned long r4, unsigned long r5, | |
364 | unsigned long r6, unsigned long r7, | |
f0bc814c | 365 | struct pt_regs __regs) |
1da177e4 | 366 | { |
f0bc814c SM |
367 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
368 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->regs[15], regs, | |
1da177e4 LT |
369 | 0, NULL, NULL); |
370 | } | |
371 | ||
372 | /* | |
373 | * sys_execve() executes a new program. | |
374 | */ | |
e08f457c PM |
375 | asmlinkage int sys_execve(char __user *ufilename, char __user * __user *uargv, |
376 | char __user * __user *uenvp, unsigned long r7, | |
f0bc814c | 377 | struct pt_regs __regs) |
1da177e4 | 378 | { |
f0bc814c | 379 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
1da177e4 LT |
380 | int error; |
381 | char *filename; | |
382 | ||
e08f457c | 383 | filename = getname(ufilename); |
1da177e4 LT |
384 | error = PTR_ERR(filename); |
385 | if (IS_ERR(filename)) | |
386 | goto out; | |
387 | ||
e08f457c | 388 | error = do_execve(filename, uargv, uenvp, regs); |
1da177e4 LT |
389 | putname(filename); |
390 | out: | |
391 | return error; | |
392 | } | |
393 | ||
394 | unsigned long get_wchan(struct task_struct *p) | |
395 | { | |
1da177e4 LT |
396 | unsigned long pc; |
397 | ||
398 | if (!p || p == current || p->state == TASK_RUNNING) | |
399 | return 0; | |
400 | ||
401 | /* | |
402 | * The same comment as on the Alpha applies here, too ... | |
403 | */ | |
404 | pc = thread_saved_pc(p); | |
c64ac9f0 DM |
405 | |
406 | #ifdef CONFIG_FRAME_POINTER | |
1da177e4 | 407 | if (in_sched_functions(pc)) { |
c64ac9f0 | 408 | unsigned long schedule_frame = (unsigned long)p->thread.sp; |
b652c23c | 409 | return ((unsigned long *)schedule_frame)[21]; |
1da177e4 | 410 | } |
c64ac9f0 | 411 | #endif |
b652c23c | 412 | |
1da177e4 LT |
413 | return pc; |
414 | } | |
415 | ||
f0bc814c | 416 | asmlinkage void break_point_trap(void) |
1da177e4 LT |
417 | { |
418 | /* Clear tracing. */ | |
8ae91b9a RS |
419 | #if defined(CONFIG_CPU_SH4A) |
420 | ctrl_outl(UBC_CBR_INIT, UBC_CBR0); | |
421 | ctrl_outl(UBC_CRR_INIT, UBC_CRR0); | |
422 | #else | |
1da177e4 LT |
423 | ctrl_outw(0, UBC_BBRA); |
424 | ctrl_outw(0, UBC_BBRB); | |
e73173db | 425 | ctrl_outl(0, UBC_BRCR); |
8ae91b9a | 426 | #endif |
1da177e4 LT |
427 | current->thread.ubc_pc = 0; |
428 | ubc_usercnt -= 1; | |
429 | ||
430 | force_sig(SIGTRAP, current); | |
431 | } |