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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__, \ | |
80a914dc | 14 | __func__, ##args) |
1da177e4 LT |
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> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
1da177e4 LT |
25 | #include <linux/module.h> |
26 | #include <linux/ptrace.h> | |
27 | #include <linux/unistd.h> | |
1da177e4 LT |
28 | #include <linux/hardirq.h> |
29 | ||
30 | #include <asm/io.h> | |
31 | #include <asm/uaccess.h> | |
32 | #include <asm/mmu_context.h> | |
33 | #include <asm/elf.h> | |
34 | #include <asm/m32r.h> | |
35 | ||
36 | #include <linux/err.h> | |
37 | ||
1da177e4 LT |
38 | /* |
39 | * Return saved PC of a blocked thread. | |
40 | */ | |
41 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
42 | { | |
43 | return tsk->thread.lr; | |
44 | } | |
45 | ||
46 | /* | |
47 | * Powermanagement idle function, if any.. | |
48 | */ | |
81e48073 | 49 | static void (*pm_idle)(void) = NULL; |
5e38291d EB |
50 | |
51 | void (*pm_power_off)(void) = NULL; | |
52 | EXPORT_SYMBOL(pm_power_off); | |
1da177e4 | 53 | |
1da177e4 LT |
54 | /* |
55 | * We use this is we don't have any better | |
56 | * idle routine.. | |
57 | */ | |
81e48073 | 58 | static void default_idle(void) |
1da177e4 LT |
59 | { |
60 | /* M32R_FIXME: Please use "cpu_sleep" mode. */ | |
61 | cpu_relax(); | |
62 | } | |
63 | ||
64 | /* | |
65 | * On SMP it's slightly faster (but much more power-consuming!) | |
66 | * to poll the ->work.need_resched flag instead of waiting for the | |
67 | * cross-CPU IPI to arrive. Use this option with caution. | |
68 | */ | |
69 | static void poll_idle (void) | |
70 | { | |
71 | /* M32R_FIXME */ | |
72 | cpu_relax(); | |
73 | } | |
74 | ||
75 | /* | |
76 | * The idle thread. There's no useful work to be | |
77 | * done, so just try to conserve power and have a | |
78 | * low exit latency (ie sit in a loop waiting for | |
79 | * somebody to say that they'd like to reschedule) | |
80 | */ | |
81 | void cpu_idle (void) | |
82 | { | |
83 | /* endless idle loop with no priority at all */ | |
84 | while (1) { | |
85 | while (!need_resched()) { | |
86 | void (*idle)(void) = pm_idle; | |
87 | ||
88 | if (!idle) | |
89 | idle = default_idle; | |
90 | ||
91 | idle(); | |
92 | } | |
bd2f5536 | 93 | schedule_preempt_disabled(); |
1da177e4 LT |
94 | } |
95 | } | |
96 | ||
97 | void machine_restart(char *__unused) | |
98 | { | |
0d34c86c HT |
99 | #if defined(CONFIG_PLAT_MAPPI3) |
100 | outw(1, (unsigned long)PLD_REBOOT); | |
101 | #endif | |
102 | ||
1da177e4 LT |
103 | printk("Please push reset button!\n"); |
104 | while (1) | |
105 | cpu_relax(); | |
106 | } | |
107 | ||
1da177e4 LT |
108 | void machine_halt(void) |
109 | { | |
110 | printk("Please push reset button!\n"); | |
111 | while (1) | |
112 | cpu_relax(); | |
113 | } | |
114 | ||
1da177e4 LT |
115 | void machine_power_off(void) |
116 | { | |
117 | /* M32R_FIXME */ | |
118 | } | |
119 | ||
1da177e4 LT |
120 | static int __init idle_setup (char *str) |
121 | { | |
122 | if (!strncmp(str, "poll", 4)) { | |
123 | printk("using poll in idle threads.\n"); | |
124 | pm_idle = poll_idle; | |
125 | } else if (!strncmp(str, "sleep", 4)) { | |
126 | printk("using sleep in idle threads.\n"); | |
127 | pm_idle = default_idle; | |
128 | } | |
129 | ||
130 | return 1; | |
131 | } | |
132 | ||
133 | __setup("idle=", idle_setup); | |
134 | ||
135 | void show_regs(struct pt_regs * regs) | |
136 | { | |
137 | printk("\n"); | |
138 | printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \ | |
139 | regs->bpc, regs->psw, regs->lr, regs->fp); | |
140 | printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \ | |
141 | regs->bbpc, regs->bbpsw, regs->spu, regs->spi); | |
142 | printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \ | |
143 | regs->r0, regs->r1, regs->r2, regs->r3); | |
144 | printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \ | |
145 | regs->r4, regs->r5, regs->r6, regs->r7); | |
146 | printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \ | |
147 | regs->r8, regs->r9, regs->r10, regs->r11); | |
148 | printk("R12[%08lx]\n", \ | |
149 | regs->r12); | |
150 | ||
151 | #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2) | |
152 | printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \ | |
153 | regs->acc0h, regs->acc0l); | |
154 | printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \ | |
155 | regs->acc1h, regs->acc1l); | |
156 | #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R) | |
157 | printk("ACCH[%08lx]:ACCL[%08lx]\n", \ | |
9674dcf7 | 158 | regs->acc0h, regs->acc0l); |
1da177e4 LT |
159 | #else |
160 | #error unknown isa configuration | |
161 | #endif | |
162 | } | |
163 | ||
164 | /* | |
165 | * Create a kernel thread | |
166 | */ | |
167 | ||
168 | /* | |
169 | * This is the mechanism for creating a new kernel thread. | |
170 | * | |
171 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
172 | * who haven't done an "execve()") should use this: it will work within | |
173 | * a system call from a "real" process, but the process memory space will | |
174 | * not be free'd until both the parent and the child have exited. | |
175 | */ | |
176 | static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg) | |
177 | { | |
178 | fn(arg); | |
179 | do_exit(-1); | |
180 | } | |
181 | ||
182 | int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) | |
183 | { | |
184 | struct pt_regs regs; | |
185 | ||
186 | memset(®s, 0, sizeof (regs)); | |
187 | regs.r1 = (unsigned long)fn; | |
188 | regs.r2 = (unsigned long)arg; | |
189 | ||
190 | regs.bpc = (unsigned long)kernel_thread_helper; | |
191 | ||
192 | regs.psw = M32R_PSW_BIE; | |
193 | ||
194 | /* Ok, create the new process. */ | |
195 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, | |
196 | NULL); | |
197 | } | |
198 | ||
199 | /* | |
200 | * Free current thread data structures etc.. | |
201 | */ | |
202 | void exit_thread(void) | |
203 | { | |
204 | /* Nothing to do. */ | |
205 | DPRINTK("pid = %d\n", current->pid); | |
206 | } | |
207 | ||
208 | void flush_thread(void) | |
209 | { | |
210 | DPRINTK("pid = %d\n", current->pid); | |
211 | memset(¤t->thread.debug_trap, 0, sizeof(struct debug_trap)); | |
212 | } | |
213 | ||
214 | void release_thread(struct task_struct *dead_task) | |
215 | { | |
216 | /* do nothing */ | |
217 | DPRINTK("pid = %d\n", dead_task->pid); | |
218 | } | |
219 | ||
220 | /* Fill in the fpu structure for a core dump.. */ | |
221 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
222 | { | |
223 | return 0; /* Task didn't use the fpu at all. */ | |
224 | } | |
225 | ||
6f2c55b8 | 226 | int copy_thread(unsigned long clone_flags, unsigned long spu, |
1da177e4 LT |
227 | unsigned long unused, struct task_struct *tsk, struct pt_regs *regs) |
228 | { | |
6c3559fc | 229 | struct pt_regs *childregs = task_pt_regs(tsk); |
1da177e4 LT |
230 | extern void ret_from_fork(void); |
231 | ||
232 | /* Copy registers */ | |
1da177e4 LT |
233 | *childregs = *regs; |
234 | ||
235 | childregs->spu = spu; | |
236 | childregs->r0 = 0; /* Child gets zero as return value */ | |
237 | regs->r0 = tsk->pid; | |
238 | tsk->thread.sp = (unsigned long)childregs; | |
239 | tsk->thread.lr = (unsigned long)ret_from_fork; | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
1da177e4 LT |
244 | asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2, |
245 | unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6, | |
246 | struct pt_regs regs) | |
247 | { | |
248 | #ifdef CONFIG_MMU | |
249 | return do_fork(SIGCHLD, regs.spu, ®s, 0, NULL, NULL); | |
250 | #else | |
251 | return -EINVAL; | |
252 | #endif /* CONFIG_MMU */ | |
253 | } | |
254 | ||
255 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
256 | unsigned long parent_tidptr, | |
257 | unsigned long child_tidptr, | |
258 | unsigned long r4, unsigned long r5, unsigned long r6, | |
259 | struct pt_regs regs) | |
260 | { | |
261 | if (!newsp) | |
262 | newsp = regs.spu; | |
263 | ||
264 | return do_fork(clone_flags, newsp, ®s, 0, | |
265 | (int __user *)parent_tidptr, (int __user *)child_tidptr); | |
266 | } | |
267 | ||
268 | /* | |
269 | * This is trivial, and on the face of it looks like it | |
270 | * could equally well be done in user mode. | |
271 | * | |
272 | * Not so, for quite unobvious reasons - register pressure. | |
273 | * In user mode vfork() cannot have a stack frame, and if | |
274 | * done by calling the "clone()" system call directly, you | |
275 | * do not have enough call-clobbered registers to hold all | |
276 | * the information you need. | |
277 | */ | |
278 | asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2, | |
279 | unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6, | |
280 | struct pt_regs regs) | |
281 | { | |
282 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, ®s, 0, | |
283 | NULL, NULL); | |
284 | } | |
285 | ||
286 | /* | |
287 | * sys_execve() executes a new program. | |
288 | */ | |
c7887325 | 289 | asmlinkage int sys_execve(const char __user *ufilename, |
d7627467 DH |
290 | const char __user *const __user *uargv, |
291 | const char __user *const __user *uenvp, | |
1da177e4 LT |
292 | unsigned long r3, unsigned long r4, unsigned long r5, |
293 | unsigned long r6, struct pt_regs regs) | |
294 | { | |
295 | int error; | |
296 | char *filename; | |
297 | ||
298 | filename = getname(ufilename); | |
299 | error = PTR_ERR(filename); | |
300 | if (IS_ERR(filename)) | |
301 | goto out; | |
302 | ||
303 | error = do_execve(filename, uargv, uenvp, ®s); | |
1da177e4 LT |
304 | putname(filename); |
305 | out: | |
306 | return error; | |
307 | } | |
308 | ||
309 | /* | |
310 | * These bracket the sleeping functions.. | |
311 | */ | |
312 | #define first_sched ((unsigned long) scheduling_functions_start_here) | |
313 | #define last_sched ((unsigned long) scheduling_functions_end_here) | |
314 | ||
315 | unsigned long get_wchan(struct task_struct *p) | |
316 | { | |
317 | /* M32R_FIXME */ | |
318 | return (0); | |
319 | } |