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1da177e4 LT |
1 | /* |
2 | * linux/arch/m32r/kernel/process.c | |
3 | * | |
4 | * Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata, | |
5 | * Hitoshi Yamamoto | |
6 | * Taken from sh version. | |
7 | * Copyright (C) 1995 Linus Torvalds | |
8 | * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima | |
9 | */ | |
10 | ||
11 | #undef DEBUG_PROCESS | |
12 | #ifdef DEBUG_PROCESS | |
13 | #define DPRINTK(fmt, args...) printk("%s:%d:%s: " fmt, __FILE__, __LINE__, \ | |
14 | __FUNCTION__, ##args) | |
15 | #else | |
16 | #define DPRINTK(fmt, args...) | |
17 | #endif | |
18 | ||
19 | /* | |
20 | * This file handles the architecture-dependent parts of process handling.. | |
21 | */ | |
22 | ||
23 | #include <linux/fs.h> | |
24 | #include <linux/config.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/ptrace.h> | |
27 | #include <linux/unistd.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/hardirq.h> | |
30 | ||
31 | #include <asm/io.h> | |
32 | #include <asm/uaccess.h> | |
33 | #include <asm/mmu_context.h> | |
34 | #include <asm/elf.h> | |
35 | #include <asm/m32r.h> | |
36 | ||
37 | #include <linux/err.h> | |
38 | ||
39 | static int hlt_counter=0; | |
40 | ||
41 | /* | |
42 | * Return saved PC of a blocked thread. | |
43 | */ | |
44 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
45 | { | |
46 | return tsk->thread.lr; | |
47 | } | |
48 | ||
49 | /* | |
50 | * Powermanagement idle function, if any.. | |
51 | */ | |
52 | void (*pm_idle)(void) = NULL; | |
53 | ||
54 | void disable_hlt(void) | |
55 | { | |
56 | hlt_counter++; | |
57 | } | |
58 | ||
59 | EXPORT_SYMBOL(disable_hlt); | |
60 | ||
61 | void enable_hlt(void) | |
62 | { | |
63 | hlt_counter--; | |
64 | } | |
65 | ||
66 | EXPORT_SYMBOL(enable_hlt); | |
67 | ||
68 | /* | |
69 | * We use this is we don't have any better | |
70 | * idle routine.. | |
71 | */ | |
72 | void default_idle(void) | |
73 | { | |
74 | /* M32R_FIXME: Please use "cpu_sleep" mode. */ | |
75 | cpu_relax(); | |
76 | } | |
77 | ||
78 | /* | |
79 | * On SMP it's slightly faster (but much more power-consuming!) | |
80 | * to poll the ->work.need_resched flag instead of waiting for the | |
81 | * cross-CPU IPI to arrive. Use this option with caution. | |
82 | */ | |
83 | static void poll_idle (void) | |
84 | { | |
85 | /* M32R_FIXME */ | |
86 | cpu_relax(); | |
87 | } | |
88 | ||
89 | /* | |
90 | * The idle thread. There's no useful work to be | |
91 | * done, so just try to conserve power and have a | |
92 | * low exit latency (ie sit in a loop waiting for | |
93 | * somebody to say that they'd like to reschedule) | |
94 | */ | |
95 | void cpu_idle (void) | |
96 | { | |
97 | /* endless idle loop with no priority at all */ | |
98 | while (1) { | |
99 | while (!need_resched()) { | |
100 | void (*idle)(void) = pm_idle; | |
101 | ||
102 | if (!idle) | |
103 | idle = default_idle; | |
104 | ||
105 | idle(); | |
106 | } | |
107 | schedule(); | |
108 | } | |
109 | } | |
110 | ||
111 | void machine_restart(char *__unused) | |
112 | { | |
113 | printk("Please push reset button!\n"); | |
114 | while (1) | |
115 | cpu_relax(); | |
116 | } | |
117 | ||
118 | EXPORT_SYMBOL(machine_restart); | |
119 | ||
120 | void machine_halt(void) | |
121 | { | |
122 | printk("Please push reset button!\n"); | |
123 | while (1) | |
124 | cpu_relax(); | |
125 | } | |
126 | ||
127 | EXPORT_SYMBOL(machine_halt); | |
128 | ||
129 | void machine_power_off(void) | |
130 | { | |
131 | /* M32R_FIXME */ | |
132 | } | |
133 | ||
134 | EXPORT_SYMBOL(machine_power_off); | |
135 | ||
136 | static int __init idle_setup (char *str) | |
137 | { | |
138 | if (!strncmp(str, "poll", 4)) { | |
139 | printk("using poll in idle threads.\n"); | |
140 | pm_idle = poll_idle; | |
141 | } else if (!strncmp(str, "sleep", 4)) { | |
142 | printk("using sleep in idle threads.\n"); | |
143 | pm_idle = default_idle; | |
144 | } | |
145 | ||
146 | return 1; | |
147 | } | |
148 | ||
149 | __setup("idle=", idle_setup); | |
150 | ||
151 | void show_regs(struct pt_regs * regs) | |
152 | { | |
153 | printk("\n"); | |
154 | printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \ | |
155 | regs->bpc, regs->psw, regs->lr, regs->fp); | |
156 | printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \ | |
157 | regs->bbpc, regs->bbpsw, regs->spu, regs->spi); | |
158 | printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \ | |
159 | regs->r0, regs->r1, regs->r2, regs->r3); | |
160 | printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \ | |
161 | regs->r4, regs->r5, regs->r6, regs->r7); | |
162 | printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \ | |
163 | regs->r8, regs->r9, regs->r10, regs->r11); | |
164 | printk("R12[%08lx]\n", \ | |
165 | regs->r12); | |
166 | ||
167 | #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2) | |
168 | printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \ | |
169 | regs->acc0h, regs->acc0l); | |
170 | printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \ | |
171 | regs->acc1h, regs->acc1l); | |
172 | #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R) | |
173 | printk("ACCH[%08lx]:ACCL[%08lx]\n", \ | |
174 | regs->acch, regs->accl); | |
175 | #else | |
176 | #error unknown isa configuration | |
177 | #endif | |
178 | } | |
179 | ||
180 | /* | |
181 | * Create a kernel thread | |
182 | */ | |
183 | ||
184 | /* | |
185 | * This is the mechanism for creating a new kernel thread. | |
186 | * | |
187 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
188 | * who haven't done an "execve()") should use this: it will work within | |
189 | * a system call from a "real" process, but the process memory space will | |
190 | * not be free'd until both the parent and the child have exited. | |
191 | */ | |
192 | static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg) | |
193 | { | |
194 | fn(arg); | |
195 | do_exit(-1); | |
196 | } | |
197 | ||
198 | int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) | |
199 | { | |
200 | struct pt_regs regs; | |
201 | ||
202 | memset(®s, 0, sizeof (regs)); | |
203 | regs.r1 = (unsigned long)fn; | |
204 | regs.r2 = (unsigned long)arg; | |
205 | ||
206 | regs.bpc = (unsigned long)kernel_thread_helper; | |
207 | ||
208 | regs.psw = M32R_PSW_BIE; | |
209 | ||
210 | /* Ok, create the new process. */ | |
211 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, | |
212 | NULL); | |
213 | } | |
214 | ||
215 | /* | |
216 | * Free current thread data structures etc.. | |
217 | */ | |
218 | void exit_thread(void) | |
219 | { | |
220 | /* Nothing to do. */ | |
221 | DPRINTK("pid = %d\n", current->pid); | |
222 | } | |
223 | ||
224 | void flush_thread(void) | |
225 | { | |
226 | DPRINTK("pid = %d\n", current->pid); | |
227 | memset(¤t->thread.debug_trap, 0, sizeof(struct debug_trap)); | |
228 | } | |
229 | ||
230 | void release_thread(struct task_struct *dead_task) | |
231 | { | |
232 | /* do nothing */ | |
233 | DPRINTK("pid = %d\n", dead_task->pid); | |
234 | } | |
235 | ||
236 | /* Fill in the fpu structure for a core dump.. */ | |
237 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
238 | { | |
239 | return 0; /* Task didn't use the fpu at all. */ | |
240 | } | |
241 | ||
242 | int copy_thread(int nr, unsigned long clone_flags, unsigned long spu, | |
243 | unsigned long unused, struct task_struct *tsk, struct pt_regs *regs) | |
244 | { | |
245 | struct pt_regs *childregs; | |
246 | unsigned long sp = (unsigned long)tsk->thread_info + THREAD_SIZE; | |
247 | extern void ret_from_fork(void); | |
248 | ||
249 | /* Copy registers */ | |
250 | sp -= sizeof (struct pt_regs); | |
251 | childregs = (struct pt_regs *)sp; | |
252 | *childregs = *regs; | |
253 | ||
254 | childregs->spu = spu; | |
255 | childregs->r0 = 0; /* Child gets zero as return value */ | |
256 | regs->r0 = tsk->pid; | |
257 | tsk->thread.sp = (unsigned long)childregs; | |
258 | tsk->thread.lr = (unsigned long)ret_from_fork; | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
263 | /* | |
264 | * fill in the user structure for a core dump.. | |
265 | */ | |
266 | void dump_thread(struct pt_regs * regs, struct user * dump) | |
267 | { | |
268 | /* M32R_FIXME */ | |
269 | } | |
270 | ||
271 | /* | |
272 | * Capture the user space registers if the task is not running (in user space) | |
273 | */ | |
274 | int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs) | |
275 | { | |
276 | /* M32R_FIXME */ | |
277 | return 1; | |
278 | } | |
279 | ||
280 | asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2, | |
281 | unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6, | |
282 | struct pt_regs regs) | |
283 | { | |
284 | #ifdef CONFIG_MMU | |
285 | return do_fork(SIGCHLD, regs.spu, ®s, 0, NULL, NULL); | |
286 | #else | |
287 | return -EINVAL; | |
288 | #endif /* CONFIG_MMU */ | |
289 | } | |
290 | ||
291 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
292 | unsigned long parent_tidptr, | |
293 | unsigned long child_tidptr, | |
294 | unsigned long r4, unsigned long r5, unsigned long r6, | |
295 | struct pt_regs regs) | |
296 | { | |
297 | if (!newsp) | |
298 | newsp = regs.spu; | |
299 | ||
300 | return do_fork(clone_flags, newsp, ®s, 0, | |
301 | (int __user *)parent_tidptr, (int __user *)child_tidptr); | |
302 | } | |
303 | ||
304 | /* | |
305 | * This is trivial, and on the face of it looks like it | |
306 | * could equally well be done in user mode. | |
307 | * | |
308 | * Not so, for quite unobvious reasons - register pressure. | |
309 | * In user mode vfork() cannot have a stack frame, and if | |
310 | * done by calling the "clone()" system call directly, you | |
311 | * do not have enough call-clobbered registers to hold all | |
312 | * the information you need. | |
313 | */ | |
314 | asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2, | |
315 | unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6, | |
316 | struct pt_regs regs) | |
317 | { | |
318 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, ®s, 0, | |
319 | NULL, NULL); | |
320 | } | |
321 | ||
322 | /* | |
323 | * sys_execve() executes a new program. | |
324 | */ | |
325 | asmlinkage int sys_execve(char __user *ufilename, char __user * __user *uargv, | |
326 | char __user * __user *uenvp, | |
327 | unsigned long r3, unsigned long r4, unsigned long r5, | |
328 | unsigned long r6, struct pt_regs regs) | |
329 | { | |
330 | int error; | |
331 | char *filename; | |
332 | ||
333 | filename = getname(ufilename); | |
334 | error = PTR_ERR(filename); | |
335 | if (IS_ERR(filename)) | |
336 | goto out; | |
337 | ||
338 | error = do_execve(filename, uargv, uenvp, ®s); | |
339 | if (error == 0) { | |
340 | task_lock(current); | |
341 | current->ptrace &= ~PT_DTRACE; | |
342 | task_unlock(current); | |
343 | } | |
344 | putname(filename); | |
345 | out: | |
346 | return error; | |
347 | } | |
348 | ||
349 | /* | |
350 | * These bracket the sleeping functions.. | |
351 | */ | |
352 | #define first_sched ((unsigned long) scheduling_functions_start_here) | |
353 | #define last_sched ((unsigned long) scheduling_functions_end_here) | |
354 | ||
355 | unsigned long get_wchan(struct task_struct *p) | |
356 | { | |
357 | /* M32R_FIXME */ | |
358 | return (0); | |
359 | } |