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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 | 28 | #include <linux/hardirq.h> |
48ae077c | 29 | #include <linux/rcupdate.h> |
1da177e4 LT |
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 | ||
1da177e4 LT |
39 | /* |
40 | * Return saved PC of a blocked thread. | |
41 | */ | |
42 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
43 | { | |
44 | return tsk->thread.lr; | |
45 | } | |
46 | ||
47 | /* | |
48 | * Powermanagement idle function, if any.. | |
49 | */ | |
81e48073 | 50 | static void (*pm_idle)(void) = NULL; |
5e38291d EB |
51 | |
52 | void (*pm_power_off)(void) = NULL; | |
53 | EXPORT_SYMBOL(pm_power_off); | |
1da177e4 | 54 | |
1da177e4 LT |
55 | /* |
56 | * We use this is we don't have any better | |
57 | * idle routine.. | |
58 | */ | |
81e48073 | 59 | static void default_idle(void) |
1da177e4 LT |
60 | { |
61 | /* M32R_FIXME: Please use "cpu_sleep" mode. */ | |
62 | cpu_relax(); | |
63 | } | |
64 | ||
65 | /* | |
66 | * On SMP it's slightly faster (but much more power-consuming!) | |
67 | * to poll the ->work.need_resched flag instead of waiting for the | |
68 | * cross-CPU IPI to arrive. Use this option with caution. | |
69 | */ | |
70 | static void poll_idle (void) | |
71 | { | |
72 | /* M32R_FIXME */ | |
73 | cpu_relax(); | |
74 | } | |
75 | ||
76 | /* | |
77 | * The idle thread. There's no useful work to be | |
78 | * done, so just try to conserve power and have a | |
79 | * low exit latency (ie sit in a loop waiting for | |
80 | * somebody to say that they'd like to reschedule) | |
81 | */ | |
82 | void cpu_idle (void) | |
83 | { | |
84 | /* endless idle loop with no priority at all */ | |
85 | while (1) { | |
48ae077c | 86 | rcu_idle_enter(); |
1da177e4 LT |
87 | while (!need_resched()) { |
88 | void (*idle)(void) = pm_idle; | |
89 | ||
90 | if (!idle) | |
91 | idle = default_idle; | |
92 | ||
93 | idle(); | |
94 | } | |
48ae077c | 95 | rcu_idle_exit(); |
bd2f5536 | 96 | schedule_preempt_disabled(); |
1da177e4 LT |
97 | } |
98 | } | |
99 | ||
100 | void machine_restart(char *__unused) | |
101 | { | |
0d34c86c HT |
102 | #if defined(CONFIG_PLAT_MAPPI3) |
103 | outw(1, (unsigned long)PLD_REBOOT); | |
104 | #endif | |
105 | ||
1da177e4 LT |
106 | printk("Please push reset button!\n"); |
107 | while (1) | |
108 | cpu_relax(); | |
109 | } | |
110 | ||
1da177e4 LT |
111 | void machine_halt(void) |
112 | { | |
113 | printk("Please push reset button!\n"); | |
114 | while (1) | |
115 | cpu_relax(); | |
116 | } | |
117 | ||
1da177e4 LT |
118 | void machine_power_off(void) |
119 | { | |
120 | /* M32R_FIXME */ | |
121 | } | |
122 | ||
1da177e4 LT |
123 | static int __init idle_setup (char *str) |
124 | { | |
125 | if (!strncmp(str, "poll", 4)) { | |
126 | printk("using poll in idle threads.\n"); | |
127 | pm_idle = poll_idle; | |
128 | } else if (!strncmp(str, "sleep", 4)) { | |
129 | printk("using sleep in idle threads.\n"); | |
130 | pm_idle = default_idle; | |
131 | } | |
132 | ||
133 | return 1; | |
134 | } | |
135 | ||
136 | __setup("idle=", idle_setup); | |
137 | ||
138 | void show_regs(struct pt_regs * regs) | |
139 | { | |
140 | printk("\n"); | |
141 | printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \ | |
142 | regs->bpc, regs->psw, regs->lr, regs->fp); | |
143 | printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \ | |
144 | regs->bbpc, regs->bbpsw, regs->spu, regs->spi); | |
145 | printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \ | |
146 | regs->r0, regs->r1, regs->r2, regs->r3); | |
147 | printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \ | |
148 | regs->r4, regs->r5, regs->r6, regs->r7); | |
149 | printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \ | |
150 | regs->r8, regs->r9, regs->r10, regs->r11); | |
151 | printk("R12[%08lx]\n", \ | |
152 | regs->r12); | |
153 | ||
154 | #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2) | |
155 | printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \ | |
156 | regs->acc0h, regs->acc0l); | |
157 | printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \ | |
158 | regs->acc1h, regs->acc1l); | |
159 | #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R) | |
160 | printk("ACCH[%08lx]:ACCL[%08lx]\n", \ | |
9674dcf7 | 161 | regs->acc0h, regs->acc0l); |
1da177e4 LT |
162 | #else |
163 | #error unknown isa configuration | |
164 | #endif | |
165 | } | |
166 | ||
167 | /* | |
168 | * Create a kernel thread | |
169 | */ | |
170 | ||
171 | /* | |
172 | * This is the mechanism for creating a new kernel thread. | |
173 | * | |
174 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
175 | * who haven't done an "execve()") should use this: it will work within | |
176 | * a system call from a "real" process, but the process memory space will | |
177 | * not be free'd until both the parent and the child have exited. | |
178 | */ | |
179 | static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg) | |
180 | { | |
181 | fn(arg); | |
182 | do_exit(-1); | |
183 | } | |
184 | ||
185 | int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) | |
186 | { | |
187 | struct pt_regs regs; | |
188 | ||
189 | memset(®s, 0, sizeof (regs)); | |
190 | regs.r1 = (unsigned long)fn; | |
191 | regs.r2 = (unsigned long)arg; | |
192 | ||
193 | regs.bpc = (unsigned long)kernel_thread_helper; | |
194 | ||
195 | regs.psw = M32R_PSW_BIE; | |
196 | ||
197 | /* Ok, create the new process. */ | |
198 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, | |
199 | NULL); | |
200 | } | |
201 | ||
202 | /* | |
203 | * Free current thread data structures etc.. | |
204 | */ | |
205 | void exit_thread(void) | |
206 | { | |
207 | /* Nothing to do. */ | |
208 | DPRINTK("pid = %d\n", current->pid); | |
209 | } | |
210 | ||
211 | void flush_thread(void) | |
212 | { | |
213 | DPRINTK("pid = %d\n", current->pid); | |
214 | memset(¤t->thread.debug_trap, 0, sizeof(struct debug_trap)); | |
215 | } | |
216 | ||
217 | void release_thread(struct task_struct *dead_task) | |
218 | { | |
219 | /* do nothing */ | |
220 | DPRINTK("pid = %d\n", dead_task->pid); | |
221 | } | |
222 | ||
223 | /* Fill in the fpu structure for a core dump.. */ | |
224 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
225 | { | |
226 | return 0; /* Task didn't use the fpu at all. */ | |
227 | } | |
228 | ||
6f2c55b8 | 229 | int copy_thread(unsigned long clone_flags, unsigned long spu, |
1da177e4 LT |
230 | unsigned long unused, struct task_struct *tsk, struct pt_regs *regs) |
231 | { | |
6c3559fc | 232 | struct pt_regs *childregs = task_pt_regs(tsk); |
1da177e4 LT |
233 | extern void ret_from_fork(void); |
234 | ||
235 | /* Copy registers */ | |
1da177e4 LT |
236 | *childregs = *regs; |
237 | ||
238 | childregs->spu = spu; | |
239 | childregs->r0 = 0; /* Child gets zero as return value */ | |
240 | regs->r0 = tsk->pid; | |
241 | tsk->thread.sp = (unsigned long)childregs; | |
242 | tsk->thread.lr = (unsigned long)ret_from_fork; | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
1da177e4 LT |
247 | asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2, |
248 | unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6, | |
249 | struct pt_regs regs) | |
250 | { | |
251 | #ifdef CONFIG_MMU | |
252 | return do_fork(SIGCHLD, regs.spu, ®s, 0, NULL, NULL); | |
253 | #else | |
254 | return -EINVAL; | |
255 | #endif /* CONFIG_MMU */ | |
256 | } | |
257 | ||
258 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
259 | unsigned long parent_tidptr, | |
260 | unsigned long child_tidptr, | |
261 | unsigned long r4, unsigned long r5, unsigned long r6, | |
262 | struct pt_regs regs) | |
263 | { | |
264 | if (!newsp) | |
265 | newsp = regs.spu; | |
266 | ||
267 | return do_fork(clone_flags, newsp, ®s, 0, | |
268 | (int __user *)parent_tidptr, (int __user *)child_tidptr); | |
269 | } | |
270 | ||
271 | /* | |
272 | * This is trivial, and on the face of it looks like it | |
273 | * could equally well be done in user mode. | |
274 | * | |
275 | * Not so, for quite unobvious reasons - register pressure. | |
276 | * In user mode vfork() cannot have a stack frame, and if | |
277 | * done by calling the "clone()" system call directly, you | |
278 | * do not have enough call-clobbered registers to hold all | |
279 | * the information you need. | |
280 | */ | |
281 | asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2, | |
282 | unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6, | |
283 | struct pt_regs regs) | |
284 | { | |
285 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, ®s, 0, | |
286 | NULL, NULL); | |
287 | } | |
288 | ||
289 | /* | |
290 | * sys_execve() executes a new program. | |
291 | */ | |
c7887325 | 292 | asmlinkage int sys_execve(const char __user *ufilename, |
d7627467 DH |
293 | const char __user *const __user *uargv, |
294 | const char __user *const __user *uenvp, | |
1da177e4 LT |
295 | unsigned long r3, unsigned long r4, unsigned long r5, |
296 | unsigned long r6, struct pt_regs regs) | |
297 | { | |
298 | int error; | |
91a27b2a | 299 | struct filename *filename; |
1da177e4 LT |
300 | |
301 | filename = getname(ufilename); | |
302 | error = PTR_ERR(filename); | |
303 | if (IS_ERR(filename)) | |
304 | goto out; | |
305 | ||
91a27b2a | 306 | error = do_execve(filename->name, uargv, uenvp, ®s); |
1da177e4 LT |
307 | putname(filename); |
308 | out: | |
309 | return error; | |
310 | } | |
311 | ||
312 | /* | |
313 | * These bracket the sleeping functions.. | |
314 | */ | |
315 | #define first_sched ((unsigned long) scheduling_functions_start_here) | |
316 | #define last_sched ((unsigned long) scheduling_functions_end_here) | |
317 | ||
318 | unsigned long get_wchan(struct task_struct *p) | |
319 | { | |
320 | /* M32R_FIXME */ | |
321 | return (0); | |
322 | } |