Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/m68knommu/kernel/process.c | |
3 | * | |
4 | * Copyright (C) 1995 Hamish Macdonald | |
5 | * | |
6 | * 68060 fixes by Jesper Skov | |
7 | * | |
8 | * uClinux changes | |
9 | * Copyright (C) 2000-2002, David McCullough <davidm@snapgear.com> | |
10 | */ | |
11 | ||
12 | /* | |
13 | * This file handles the architecture-dependent parts of process handling.. | |
14 | */ | |
15 | ||
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <linux/errno.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/smp.h> | |
22 | #include <linux/smp_lock.h> | |
23 | #include <linux/stddef.h> | |
24 | #include <linux/unistd.h> | |
25 | #include <linux/ptrace.h> | |
1da177e4 | 26 | #include <linux/user.h> |
1da177e4 LT |
27 | #include <linux/interrupt.h> |
28 | #include <linux/reboot.h> | |
07ef3093 | 29 | #include <linux/fs.h> |
5a0e3ad6 | 30 | #include <linux/slab.h> |
1da177e4 LT |
31 | |
32 | #include <asm/uaccess.h> | |
33 | #include <asm/system.h> | |
34 | #include <asm/traps.h> | |
35 | #include <asm/machdep.h> | |
36 | #include <asm/setup.h> | |
37 | #include <asm/pgtable.h> | |
38 | ||
39 | asmlinkage void ret_from_fork(void); | |
40 | ||
10c1f71c GU |
41 | /* |
42 | * The following aren't currently used. | |
43 | */ | |
44 | void (*pm_idle)(void); | |
45 | EXPORT_SYMBOL(pm_idle); | |
46 | ||
47 | void (*pm_power_off)(void); | |
48 | EXPORT_SYMBOL(pm_power_off); | |
1da177e4 LT |
49 | |
50 | /* | |
51 | * The idle loop on an m68knommu.. | |
52 | */ | |
cdb04527 | 53 | static void default_idle(void) |
1da177e4 | 54 | { |
b05a720b GU |
55 | local_irq_disable(); |
56 | while (!need_resched()) { | |
57 | /* This stop will re-enable interrupts */ | |
58 | __asm__("stop #0x2000" : : : "cc"); | |
59 | local_irq_disable(); | |
1da177e4 | 60 | } |
b05a720b | 61 | local_irq_enable(); |
1da177e4 LT |
62 | } |
63 | ||
64 | void (*idle)(void) = default_idle; | |
65 | ||
66 | /* | |
67 | * The idle thread. There's no useful work to be | |
68 | * done, so just try to conserve power and have a | |
69 | * low exit latency (ie sit in a loop waiting for | |
70 | * somebody to say that they'd like to reschedule) | |
71 | */ | |
72 | void cpu_idle(void) | |
73 | { | |
74 | /* endless idle loop with no priority at all */ | |
b05a720b GU |
75 | while (1) { |
76 | idle(); | |
77 | preempt_enable_no_resched(); | |
78 | schedule(); | |
79 | preempt_disable(); | |
80 | } | |
1da177e4 LT |
81 | } |
82 | ||
83 | void machine_restart(char * __unused) | |
84 | { | |
85 | if (mach_reset) | |
86 | mach_reset(); | |
87 | for (;;); | |
88 | } | |
89 | ||
1da177e4 LT |
90 | void machine_halt(void) |
91 | { | |
92 | if (mach_halt) | |
93 | mach_halt(); | |
94 | for (;;); | |
95 | } | |
96 | ||
1da177e4 LT |
97 | void machine_power_off(void) |
98 | { | |
99 | if (mach_power_off) | |
100 | mach_power_off(); | |
101 | for (;;); | |
102 | } | |
103 | ||
1da177e4 LT |
104 | void show_regs(struct pt_regs * regs) |
105 | { | |
106 | printk(KERN_NOTICE "\n"); | |
107 | printk(KERN_NOTICE "Format %02x Vector: %04x PC: %08lx Status: %04x %s\n", | |
108 | regs->format, regs->vector, regs->pc, regs->sr, print_tainted()); | |
109 | printk(KERN_NOTICE "ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n", | |
110 | regs->orig_d0, regs->d0, regs->a2, regs->a1); | |
111 | printk(KERN_NOTICE "A0: %08lx D5: %08lx D4: %08lx\n", | |
112 | regs->a0, regs->d5, regs->d4); | |
113 | printk(KERN_NOTICE "D3: %08lx D2: %08lx D1: %08lx\n", | |
114 | regs->d3, regs->d2, regs->d1); | |
115 | if (!(regs->sr & PS_S)) | |
116 | printk(KERN_NOTICE "USP: %08lx\n", rdusp()); | |
117 | } | |
118 | ||
119 | /* | |
120 | * Create a kernel thread | |
121 | */ | |
122 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
123 | { | |
124 | int retval; | |
125 | long clone_arg = flags | CLONE_VM; | |
126 | mm_segment_t fs; | |
127 | ||
128 | fs = get_fs(); | |
129 | set_fs(KERNEL_DS); | |
130 | ||
131 | __asm__ __volatile__ ( | |
132 | "movel %%sp, %%d2\n\t" | |
133 | "movel %5, %%d1\n\t" | |
134 | "movel %1, %%d0\n\t" | |
135 | "trap #0\n\t" | |
136 | "cmpl %%sp, %%d2\n\t" | |
137 | "jeq 1f\n\t" | |
138 | "movel %3, %%sp@-\n\t" | |
139 | "jsr %4@\n\t" | |
140 | "movel %2, %%d0\n\t" | |
141 | "trap #0\n" | |
142 | "1:\n\t" | |
143 | "movel %%d0, %0\n" | |
144 | : "=d" (retval) | |
145 | : "i" (__NR_clone), | |
146 | "i" (__NR_exit), | |
147 | "a" (arg), | |
148 | "a" (fn), | |
149 | "a" (clone_arg) | |
150 | : "cc", "%d0", "%d1", "%d2"); | |
151 | ||
152 | set_fs(fs); | |
153 | return retval; | |
154 | } | |
155 | ||
156 | void flush_thread(void) | |
157 | { | |
158 | #ifdef CONFIG_FPU | |
159 | unsigned long zero = 0; | |
160 | #endif | |
161 | set_fs(USER_DS); | |
162 | current->thread.fs = __USER_DS; | |
163 | #ifdef CONFIG_FPU | |
164 | if (!FPU_IS_EMU) | |
165 | asm volatile (".chip 68k/68881\n\t" | |
166 | "frestore %0@\n\t" | |
167 | ".chip 68k" : : "a" (&zero)); | |
168 | #endif | |
169 | } | |
170 | ||
171 | /* | |
172 | * "m68k_fork()".. By the time we get here, the | |
173 | * non-volatile registers have also been saved on the | |
174 | * stack. We do some ugly pointer stuff here.. (see | |
175 | * also copy_thread) | |
176 | */ | |
177 | ||
178 | asmlinkage int m68k_fork(struct pt_regs *regs) | |
179 | { | |
180 | /* fork almost works, enough to trick you into looking elsewhere :-( */ | |
181 | return(-EINVAL); | |
182 | } | |
183 | ||
184 | asmlinkage int m68k_vfork(struct pt_regs *regs) | |
185 | { | |
186 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL); | |
187 | } | |
188 | ||
189 | asmlinkage int m68k_clone(struct pt_regs *regs) | |
190 | { | |
191 | unsigned long clone_flags; | |
192 | unsigned long newsp; | |
193 | ||
194 | /* syscall2 puts clone_flags in d1 and usp in d2 */ | |
195 | clone_flags = regs->d1; | |
196 | newsp = regs->d2; | |
197 | if (!newsp) | |
198 | newsp = rdusp(); | |
199 | return do_fork(clone_flags, newsp, regs, 0, NULL, NULL); | |
200 | } | |
201 | ||
6f2c55b8 | 202 | int copy_thread(unsigned long clone_flags, |
1da177e4 LT |
203 | unsigned long usp, unsigned long topstk, |
204 | struct task_struct * p, struct pt_regs * regs) | |
205 | { | |
206 | struct pt_regs * childregs; | |
207 | struct switch_stack * childstack, *stack; | |
513091ba | 208 | unsigned long *retp; |
1da177e4 | 209 | |
513091ba | 210 | childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1; |
1da177e4 LT |
211 | |
212 | *childregs = *regs; | |
213 | childregs->d0 = 0; | |
214 | ||
215 | retp = ((unsigned long *) regs); | |
216 | stack = ((struct switch_stack *) retp) - 1; | |
217 | ||
218 | childstack = ((struct switch_stack *) childregs) - 1; | |
219 | *childstack = *stack; | |
220 | childstack->retpc = (unsigned long)ret_from_fork; | |
221 | ||
222 | p->thread.usp = usp; | |
223 | p->thread.ksp = (unsigned long)childstack; | |
a58f7534 MK |
224 | |
225 | if (clone_flags & CLONE_SETTLS) | |
226 | task_thread_info(p)->tp_value = regs->d5; | |
227 | ||
1da177e4 LT |
228 | /* |
229 | * Must save the current SFC/DFC value, NOT the value when | |
230 | * the parent was last descheduled - RGH 10-08-96 | |
231 | */ | |
232 | p->thread.fs = get_fs().seg; | |
233 | ||
234 | #ifdef CONFIG_FPU | |
235 | if (!FPU_IS_EMU) { | |
236 | /* Copy the current fpu state */ | |
237 | asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory"); | |
238 | ||
239 | if (p->thread.fpstate[0]) | |
240 | asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t" | |
241 | "fmoveml %/fpiar/%/fpcr/%/fpsr,%1" | |
242 | : : "m" (p->thread.fp[0]), "m" (p->thread.fpcntl[0]) | |
243 | : "memory"); | |
244 | /* Restore the state in case the fpu was busy */ | |
245 | asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0])); | |
246 | } | |
247 | #endif | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | /* Fill in the fpu structure for a core dump. */ | |
253 | ||
254 | int dump_fpu(struct pt_regs *regs, struct user_m68kfp_struct *fpu) | |
255 | { | |
256 | #ifdef CONFIG_FPU | |
257 | char fpustate[216]; | |
258 | ||
259 | if (FPU_IS_EMU) { | |
260 | int i; | |
261 | ||
262 | memcpy(fpu->fpcntl, current->thread.fpcntl, 12); | |
263 | memcpy(fpu->fpregs, current->thread.fp, 96); | |
264 | /* Convert internal fpu reg representation | |
265 | * into long double format | |
266 | */ | |
267 | for (i = 0; i < 24; i += 3) | |
268 | fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) | | |
269 | ((fpu->fpregs[i] & 0x0000ffff) << 16); | |
270 | return 1; | |
271 | } | |
272 | ||
273 | /* First dump the fpu context to avoid protocol violation. */ | |
274 | asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory"); | |
275 | if (!fpustate[0]) | |
276 | return 0; | |
277 | ||
278 | asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0" | |
279 | :: "m" (fpu->fpcntl[0]) | |
280 | : "memory"); | |
281 | asm volatile ("fmovemx %/fp0-%/fp7,%0" | |
282 | :: "m" (fpu->fpregs[0]) | |
283 | : "memory"); | |
284 | #endif | |
285 | return 1; | |
286 | } | |
287 | ||
1da177e4 LT |
288 | /* |
289 | * Generic dumping code. Used for panic and debug. | |
290 | */ | |
291 | void dump(struct pt_regs *fp) | |
292 | { | |
293 | unsigned long *sp; | |
294 | unsigned char *tp; | |
295 | int i; | |
296 | ||
ad361c98 | 297 | printk(KERN_EMERG "\nCURRENT PROCESS:\n\n"); |
1da177e4 LT |
298 | printk(KERN_EMERG "COMM=%s PID=%d\n", current->comm, current->pid); |
299 | ||
300 | if (current->mm) { | |
301 | printk(KERN_EMERG "TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n", | |
302 | (int) current->mm->start_code, | |
303 | (int) current->mm->end_code, | |
304 | (int) current->mm->start_data, | |
305 | (int) current->mm->end_data, | |
306 | (int) current->mm->end_data, | |
307 | (int) current->mm->brk); | |
ad361c98 | 308 | printk(KERN_EMERG "USER-STACK=%08x KERNEL-STACK=%08x\n\n", |
1da177e4 LT |
309 | (int) current->mm->start_stack, |
310 | (int)(((unsigned long) current) + THREAD_SIZE)); | |
311 | } | |
312 | ||
313 | printk(KERN_EMERG "PC: %08lx\n", fp->pc); | |
314 | printk(KERN_EMERG "SR: %08lx SP: %08lx\n", (long) fp->sr, (long) fp); | |
315 | printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n", | |
316 | fp->d0, fp->d1, fp->d2, fp->d3); | |
317 | printk(KERN_EMERG "d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n", | |
318 | fp->d4, fp->d5, fp->a0, fp->a1); | |
c7484cf4 KV |
319 | printk(KERN_EMERG "\nUSP: %08x TRAPFRAME: %p\n", |
320 | (unsigned int) rdusp(), fp); | |
1da177e4 | 321 | |
ad361c98 | 322 | printk(KERN_EMERG "\nCODE:"); |
1da177e4 LT |
323 | tp = ((unsigned char *) fp->pc) - 0x20; |
324 | for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) { | |
325 | if ((i % 0x10) == 0) | |
c7484cf4 | 326 | printk(KERN_EMERG "%p: ", tp + i); |
19127e2b | 327 | printk("%08x ", (int) *sp++); |
1da177e4 | 328 | } |
ad361c98 | 329 | printk(KERN_EMERG "\n"); |
1da177e4 | 330 | |
19127e2b | 331 | printk(KERN_EMERG "KERNEL STACK:"); |
1da177e4 LT |
332 | tp = ((unsigned char *) fp) - 0x40; |
333 | for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) { | |
334 | if ((i % 0x10) == 0) | |
c7484cf4 | 335 | printk(KERN_EMERG "%p: ", tp + i); |
19127e2b | 336 | printk("%08x ", (int) *sp++); |
1da177e4 | 337 | } |
ad361c98 | 338 | printk(KERN_EMERG "\n"); |
1da177e4 | 339 | |
19127e2b | 340 | printk(KERN_EMERG "USER STACK:"); |
1da177e4 LT |
341 | tp = (unsigned char *) (rdusp() - 0x10); |
342 | for (sp = (unsigned long *) tp, i = 0; (i < 0x80); i += 4) { | |
343 | if ((i % 0x10) == 0) | |
c7484cf4 | 344 | printk(KERN_EMERG "%p: ", tp + i); |
19127e2b | 345 | printk("%08x ", (int) *sp++); |
1da177e4 | 346 | } |
ad361c98 | 347 | printk(KERN_EMERG "\n"); |
1da177e4 LT |
348 | } |
349 | ||
350 | /* | |
351 | * sys_execve() executes a new program. | |
352 | */ | |
d7627467 DH |
353 | asmlinkage int sys_execve(const char *name, |
354 | const char *const *argv, | |
355 | const char *const *envp) | |
1da177e4 LT |
356 | { |
357 | int error; | |
358 | char * filename; | |
359 | struct pt_regs *regs = (struct pt_regs *) &name; | |
360 | ||
1da177e4 LT |
361 | filename = getname(name); |
362 | error = PTR_ERR(filename); | |
363 | if (IS_ERR(filename)) | |
eb7371d4 | 364 | return error; |
1da177e4 LT |
365 | error = do_execve(filename, argv, envp, regs); |
366 | putname(filename); | |
1da177e4 LT |
367 | return error; |
368 | } | |
369 | ||
370 | unsigned long get_wchan(struct task_struct *p) | |
371 | { | |
372 | unsigned long fp, pc; | |
373 | unsigned long stack_page; | |
374 | int count = 0; | |
375 | if (!p || p == current || p->state == TASK_RUNNING) | |
376 | return 0; | |
377 | ||
378 | stack_page = (unsigned long)p; | |
379 | fp = ((struct switch_stack *)p->thread.ksp)->a6; | |
380 | do { | |
381 | if (fp < stack_page+sizeof(struct thread_info) || | |
45a82f51 | 382 | fp >= THREAD_SIZE-8+stack_page) |
1da177e4 LT |
383 | return 0; |
384 | pc = ((unsigned long *)fp)[1]; | |
385 | if (!in_sched_functions(pc)) | |
386 | return pc; | |
387 | fp = *(unsigned long *) fp; | |
388 | } while (count++ < 16); | |
389 | return 0; | |
390 | } | |
391 | ||
392 | /* | |
393 | * Return saved PC of a blocked thread. | |
394 | */ | |
395 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
396 | { | |
397 | struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp; | |
398 | ||
399 | /* Check whether the thread is blocked in resume() */ | |
400 | if (in_sched_functions(sw->retpc)) | |
401 | return ((unsigned long *)sw->a6)[1]; | |
402 | else | |
403 | return sw->retpc; | |
404 | } | |
405 |