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1da177e4 LT |
1 | /* |
2 | * linux/arch/m68k/kernel/process.c | |
3 | * | |
4 | * Copyright (C) 1995 Hamish Macdonald | |
5 | * | |
6 | * 68060 fixes by Jesper Skov | |
7 | */ | |
8 | ||
9 | /* | |
10 | * This file handles the architecture-dependent parts of process handling.. | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/errno.h> |
14 | #include <linux/module.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/mm.h> | |
4e950f6f | 18 | #include <linux/fs.h> |
1da177e4 LT |
19 | #include <linux/smp.h> |
20 | #include <linux/smp_lock.h> | |
21 | #include <linux/stddef.h> | |
22 | #include <linux/unistd.h> | |
23 | #include <linux/ptrace.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/user.h> | |
1da177e4 LT |
26 | #include <linux/reboot.h> |
27 | #include <linux/init_task.h> | |
28 | #include <linux/mqueue.h> | |
29 | ||
30 | #include <asm/uaccess.h> | |
31 | #include <asm/system.h> | |
32 | #include <asm/traps.h> | |
33 | #include <asm/machdep.h> | |
34 | #include <asm/setup.h> | |
35 | #include <asm/pgtable.h> | |
36 | ||
37 | /* | |
38 | * Initial task/thread structure. Make this a per-architecture thing, | |
39 | * because different architectures tend to have different | |
40 | * alignment requirements and potentially different initial | |
41 | * setup. | |
42 | */ | |
1da177e4 LT |
43 | static struct signal_struct init_signals = INIT_SIGNALS(init_signals); |
44 | static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); | |
d200c922 JP |
45 | union thread_union init_thread_union __init_task_data |
46 | __attribute__((aligned(THREAD_SIZE))) = | |
47 | { INIT_THREAD_INFO(init_task) }; | |
1da177e4 LT |
48 | |
49 | /* initial task structure */ | |
50 | struct task_struct init_task = INIT_TASK(init_task); | |
51 | ||
52 | EXPORT_SYMBOL(init_task); | |
53 | ||
54 | asmlinkage void ret_from_fork(void); | |
55 | ||
56 | ||
57 | /* | |
58 | * Return saved PC from a blocked thread | |
59 | */ | |
60 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
61 | { | |
62 | struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp; | |
63 | /* Check whether the thread is blocked in resume() */ | |
64 | if (in_sched_functions(sw->retpc)) | |
65 | return ((unsigned long *)sw->a6)[1]; | |
66 | else | |
67 | return sw->retpc; | |
68 | } | |
69 | ||
70 | /* | |
71 | * The idle loop on an m68k.. | |
72 | */ | |
cdb04527 | 73 | static void default_idle(void) |
1da177e4 LT |
74 | { |
75 | if (!need_resched()) | |
29c8a246 | 76 | #if defined(MACH_ATARI_ONLY) |
1da177e4 LT |
77 | /* block out HSYNC on the atari (falcon) */ |
78 | __asm__("stop #0x2200" : : : "cc"); | |
79 | #else | |
80 | __asm__("stop #0x2000" : : : "cc"); | |
81 | #endif | |
82 | } | |
83 | ||
84 | void (*idle)(void) = default_idle; | |
85 | ||
86 | /* | |
87 | * The idle thread. There's no useful work to be | |
88 | * done, so just try to conserve power and have a | |
89 | * low exit latency (ie sit in a loop waiting for | |
90 | * somebody to say that they'd like to reschedule) | |
91 | */ | |
92 | void cpu_idle(void) | |
93 | { | |
94 | /* endless idle loop with no priority at all */ | |
95 | while (1) { | |
96 | while (!need_resched()) | |
97 | idle(); | |
5bfb5d69 | 98 | preempt_enable_no_resched(); |
1da177e4 | 99 | schedule(); |
5bfb5d69 | 100 | preempt_disable(); |
1da177e4 LT |
101 | } |
102 | } | |
103 | ||
104 | void machine_restart(char * __unused) | |
105 | { | |
106 | if (mach_reset) | |
107 | mach_reset(); | |
108 | for (;;); | |
109 | } | |
110 | ||
1da177e4 LT |
111 | void machine_halt(void) |
112 | { | |
113 | if (mach_halt) | |
114 | mach_halt(); | |
115 | for (;;); | |
116 | } | |
117 | ||
1da177e4 LT |
118 | void machine_power_off(void) |
119 | { | |
120 | if (mach_power_off) | |
121 | mach_power_off(); | |
122 | for (;;); | |
123 | } | |
124 | ||
cead14da AV |
125 | void (*pm_power_off)(void) = machine_power_off; |
126 | EXPORT_SYMBOL(pm_power_off); | |
127 | ||
1da177e4 LT |
128 | void show_regs(struct pt_regs * regs) |
129 | { | |
130 | printk("\n"); | |
131 | printk("Format %02x Vector: %04x PC: %08lx Status: %04x %s\n", | |
132 | regs->format, regs->vector, regs->pc, regs->sr, print_tainted()); | |
133 | printk("ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n", | |
134 | regs->orig_d0, regs->d0, regs->a2, regs->a1); | |
135 | printk("A0: %08lx D5: %08lx D4: %08lx\n", | |
136 | regs->a0, regs->d5, regs->d4); | |
137 | printk("D3: %08lx D2: %08lx D1: %08lx\n", | |
138 | regs->d3, regs->d2, regs->d1); | |
139 | if (!(regs->sr & PS_S)) | |
140 | printk("USP: %08lx\n", rdusp()); | |
141 | } | |
142 | ||
143 | /* | |
144 | * Create a kernel thread | |
145 | */ | |
146 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
147 | { | |
148 | int pid; | |
149 | mm_segment_t fs; | |
150 | ||
151 | fs = get_fs(); | |
152 | set_fs (KERNEL_DS); | |
153 | ||
154 | { | |
155 | register long retval __asm__ ("d0"); | |
156 | register long clone_arg __asm__ ("d1") = flags | CLONE_VM | CLONE_UNTRACED; | |
157 | ||
158 | retval = __NR_clone; | |
159 | __asm__ __volatile__ | |
160 | ("clrl %%d2\n\t" | |
161 | "trap #0\n\t" /* Linux/m68k system call */ | |
162 | "tstl %0\n\t" /* child or parent */ | |
163 | "jne 1f\n\t" /* parent - jump */ | |
164 | "lea %%sp@(%c7),%6\n\t" /* reload current */ | |
165 | "movel %6@,%6\n\t" | |
166 | "movel %3,%%sp@-\n\t" /* push argument */ | |
167 | "jsr %4@\n\t" /* call fn */ | |
168 | "movel %0,%%d1\n\t" /* pass exit value */ | |
169 | "movel %2,%%d0\n\t" /* exit */ | |
170 | "trap #0\n" | |
171 | "1:" | |
172 | : "+d" (retval) | |
173 | : "i" (__NR_clone), "i" (__NR_exit), | |
174 | "r" (arg), "a" (fn), "d" (clone_arg), "r" (current), | |
175 | "i" (-THREAD_SIZE) | |
176 | : "d2"); | |
177 | ||
178 | pid = retval; | |
179 | } | |
180 | ||
181 | set_fs (fs); | |
182 | return pid; | |
183 | } | |
2e811488 | 184 | EXPORT_SYMBOL(kernel_thread); |
1da177e4 LT |
185 | |
186 | void flush_thread(void) | |
187 | { | |
188 | unsigned long zero = 0; | |
189 | set_fs(USER_DS); | |
190 | current->thread.fs = __USER_DS; | |
191 | if (!FPU_IS_EMU) | |
192 | asm volatile (".chip 68k/68881\n\t" | |
193 | "frestore %0@\n\t" | |
194 | ".chip 68k" : : "a" (&zero)); | |
195 | } | |
196 | ||
197 | /* | |
198 | * "m68k_fork()".. By the time we get here, the | |
199 | * non-volatile registers have also been saved on the | |
200 | * stack. We do some ugly pointer stuff here.. (see | |
201 | * also copy_thread) | |
202 | */ | |
203 | ||
204 | asmlinkage int m68k_fork(struct pt_regs *regs) | |
205 | { | |
206 | return do_fork(SIGCHLD, rdusp(), regs, 0, NULL, NULL); | |
207 | } | |
208 | ||
209 | asmlinkage int m68k_vfork(struct pt_regs *regs) | |
210 | { | |
211 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, | |
212 | NULL, NULL); | |
213 | } | |
214 | ||
215 | asmlinkage int m68k_clone(struct pt_regs *regs) | |
216 | { | |
217 | unsigned long clone_flags; | |
218 | unsigned long newsp; | |
1e5c374d | 219 | int __user *parent_tidptr, *child_tidptr; |
1da177e4 LT |
220 | |
221 | /* syscall2 puts clone_flags in d1 and usp in d2 */ | |
222 | clone_flags = regs->d1; | |
223 | newsp = regs->d2; | |
1e5c374d AV |
224 | parent_tidptr = (int __user *)regs->d3; |
225 | child_tidptr = (int __user *)regs->d4; | |
1da177e4 LT |
226 | if (!newsp) |
227 | newsp = rdusp(); | |
228 | return do_fork(clone_flags, newsp, regs, 0, | |
229 | parent_tidptr, child_tidptr); | |
230 | } | |
231 | ||
6f2c55b8 | 232 | int copy_thread(unsigned long clone_flags, unsigned long usp, |
1da177e4 LT |
233 | unsigned long unused, |
234 | struct task_struct * p, struct pt_regs * regs) | |
235 | { | |
236 | struct pt_regs * childregs; | |
237 | struct switch_stack * childstack, *stack; | |
768595ff | 238 | unsigned long *retp; |
1da177e4 | 239 | |
768595ff | 240 | childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1; |
1da177e4 LT |
241 | |
242 | *childregs = *regs; | |
243 | childregs->d0 = 0; | |
244 | ||
245 | retp = ((unsigned long *) regs); | |
246 | stack = ((struct switch_stack *) retp) - 1; | |
247 | ||
248 | childstack = ((struct switch_stack *) childregs) - 1; | |
249 | *childstack = *stack; | |
250 | childstack->retpc = (unsigned long)ret_from_fork; | |
251 | ||
252 | p->thread.usp = usp; | |
253 | p->thread.ksp = (unsigned long)childstack; | |
254 | /* | |
255 | * Must save the current SFC/DFC value, NOT the value when | |
256 | * the parent was last descheduled - RGH 10-08-96 | |
257 | */ | |
258 | p->thread.fs = get_fs().seg; | |
259 | ||
260 | if (!FPU_IS_EMU) { | |
261 | /* Copy the current fpu state */ | |
262 | asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory"); | |
263 | ||
264 | if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2]) | |
265 | asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t" | |
266 | "fmoveml %/fpiar/%/fpcr/%/fpsr,%1" | |
267 | : : "m" (p->thread.fp[0]), "m" (p->thread.fpcntl[0]) | |
268 | : "memory"); | |
269 | /* Restore the state in case the fpu was busy */ | |
270 | asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0])); | |
271 | } | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | /* Fill in the fpu structure for a core dump. */ | |
277 | ||
278 | int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu) | |
279 | { | |
280 | char fpustate[216]; | |
281 | ||
282 | if (FPU_IS_EMU) { | |
283 | int i; | |
284 | ||
285 | memcpy(fpu->fpcntl, current->thread.fpcntl, 12); | |
286 | memcpy(fpu->fpregs, current->thread.fp, 96); | |
287 | /* Convert internal fpu reg representation | |
288 | * into long double format | |
289 | */ | |
290 | for (i = 0; i < 24; i += 3) | |
291 | fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) | | |
292 | ((fpu->fpregs[i] & 0x0000ffff) << 16); | |
293 | return 1; | |
294 | } | |
295 | ||
296 | /* First dump the fpu context to avoid protocol violation. */ | |
297 | asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory"); | |
298 | if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2]) | |
299 | return 0; | |
300 | ||
301 | asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0" | |
302 | :: "m" (fpu->fpcntl[0]) | |
303 | : "memory"); | |
304 | asm volatile ("fmovemx %/fp0-%/fp7,%0" | |
305 | :: "m" (fpu->fpregs[0]) | |
306 | : "memory"); | |
307 | return 1; | |
308 | } | |
2e811488 | 309 | EXPORT_SYMBOL(dump_fpu); |
1da177e4 | 310 | |
1da177e4 LT |
311 | /* |
312 | * sys_execve() executes a new program. | |
313 | */ | |
1e5c374d | 314 | asmlinkage int sys_execve(char __user *name, char __user * __user *argv, char __user * __user *envp) |
1da177e4 LT |
315 | { |
316 | int error; | |
317 | char * filename; | |
318 | struct pt_regs *regs = (struct pt_regs *) &name; | |
319 | ||
1da177e4 LT |
320 | filename = getname(name); |
321 | error = PTR_ERR(filename); | |
322 | if (IS_ERR(filename)) | |
87fbaf6a | 323 | return error; |
1da177e4 LT |
324 | error = do_execve(filename, argv, envp, regs); |
325 | putname(filename); | |
1da177e4 LT |
326 | return error; |
327 | } | |
328 | ||
329 | unsigned long get_wchan(struct task_struct *p) | |
330 | { | |
331 | unsigned long fp, pc; | |
332 | unsigned long stack_page; | |
333 | int count = 0; | |
334 | if (!p || p == current || p->state == TASK_RUNNING) | |
335 | return 0; | |
336 | ||
768595ff | 337 | stack_page = (unsigned long)task_stack_page(p); |
1da177e4 LT |
338 | fp = ((struct switch_stack *)p->thread.ksp)->a6; |
339 | do { | |
340 | if (fp < stack_page+sizeof(struct thread_info) || | |
341 | fp >= 8184+stack_page) | |
342 | return 0; | |
343 | pc = ((unsigned long *)fp)[1]; | |
344 | if (!in_sched_functions(pc)) | |
345 | return pc; | |
346 | fp = *(unsigned long *) fp; | |
347 | } while (count++ < 16); | |
348 | return 0; | |
349 | } |