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1da177e4 LT |
1 | /* |
2 | * PARISC Architecture-dependent parts of process handling | |
3 | * based on the work for i386 | |
4 | * | |
5 | * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org> | |
6 | * Copyright (C) 2000 Martin K Petersen <mkp at mkp.net> | |
7 | * Copyright (C) 2000 John Marvin <jsm at parisc-linux.org> | |
8 | * Copyright (C) 2000 David Huggins-Daines <dhd with pobox.org> | |
9 | * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org> | |
10 | * Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org> | |
11 | * Copyright (C) 2000 David Kennedy <dkennedy with linuxcare.com> | |
b2450cc1 | 12 | * Copyright (C) 2000 Richard Hirst <rhirst with parisc-linux.org> |
1da177e4 LT |
13 | * Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org> |
14 | * Copyright (C) 2001 Alan Modra <amodra at parisc-linux.org> | |
15 | * Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org> | |
a8f44e38 | 16 | * Copyright (C) 2001-2007 Helge Deller <deller at parisc-linux.org> |
1da177e4 LT |
17 | * Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org> |
18 | * | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or modify | |
21 | * it under the terms of the GNU General Public License as published by | |
22 | * the Free Software Foundation; either version 2 of the License, or | |
23 | * (at your option) any later version. | |
24 | * | |
25 | * This program is distributed in the hope that it will be useful, | |
26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28 | * GNU General Public License for more details. | |
29 | * | |
30 | * You should have received a copy of the GNU General Public License | |
31 | * along with this program; if not, write to the Free Software | |
32 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
33 | */ | |
34 | ||
35 | #include <stdarg.h> | |
36 | ||
37 | #include <linux/elf.h> | |
38 | #include <linux/errno.h> | |
39 | #include <linux/kernel.h> | |
40 | #include <linux/mm.h> | |
4e950f6f | 41 | #include <linux/fs.h> |
1da177e4 LT |
42 | #include <linux/module.h> |
43 | #include <linux/personality.h> | |
44 | #include <linux/ptrace.h> | |
45 | #include <linux/sched.h> | |
46 | #include <linux/stddef.h> | |
47 | #include <linux/unistd.h> | |
48 | #include <linux/kallsyms.h> | |
49 | ||
50 | #include <asm/io.h> | |
0013a854 | 51 | #include <asm/asm-offsets.h> |
1da177e4 LT |
52 | #include <asm/pdc.h> |
53 | #include <asm/pdc_chassis.h> | |
54 | #include <asm/pgalloc.h> | |
55 | #include <asm/uaccess.h> | |
56 | #include <asm/unwind.h> | |
57 | ||
1da177e4 LT |
58 | /* |
59 | * The idle thread. There's no useful work to be | |
60 | * done, so just try to conserve power and have a | |
61 | * low exit latency (ie sit in a loop waiting for | |
62 | * somebody to say that they'd like to reschedule) | |
63 | */ | |
64 | void cpu_idle(void) | |
65 | { | |
64c7c8f8 NP |
66 | set_thread_flag(TIF_POLLING_NRFLAG); |
67 | ||
1da177e4 LT |
68 | /* endless idle loop with no priority at all */ |
69 | while (1) { | |
70 | while (!need_resched()) | |
71 | barrier(); | |
5bfb5d69 | 72 | preempt_enable_no_resched(); |
1da177e4 | 73 | schedule(); |
5bfb5d69 | 74 | preempt_disable(); |
1da177e4 LT |
75 | check_pgt_cache(); |
76 | } | |
77 | } | |
78 | ||
79 | ||
10992092 | 80 | #define COMMAND_GLOBAL F_EXTEND(0xfffe0030) |
1da177e4 LT |
81 | #define CMD_RESET 5 /* reset any module */ |
82 | ||
83 | /* | |
84 | ** The Wright Brothers and Gecko systems have a H/W problem | |
85 | ** (Lasi...'nuf said) may cause a broadcast reset to lockup | |
86 | ** the system. An HVERSION dependent PDC call was developed | |
87 | ** to perform a "safe", platform specific broadcast reset instead | |
88 | ** of kludging up all the code. | |
89 | ** | |
90 | ** Older machines which do not implement PDC_BROADCAST_RESET will | |
91 | ** return (with an error) and the regular broadcast reset can be | |
92 | ** issued. Obviously, if the PDC does implement PDC_BROADCAST_RESET | |
93 | ** the PDC call will not return (the system will be reset). | |
94 | */ | |
95 | void machine_restart(char *cmd) | |
96 | { | |
97 | #ifdef FASTBOOT_SELFTEST_SUPPORT | |
98 | /* | |
99 | ** If user has modified the Firmware Selftest Bitmap, | |
100 | ** run the tests specified in the bitmap after the | |
101 | ** system is rebooted w/PDC_DO_RESET. | |
102 | ** | |
103 | ** ftc_bitmap = 0x1AUL "Skip destructive memory tests" | |
104 | ** | |
105 | ** Using "directed resets" at each processor with the MEM_TOC | |
106 | ** vector cleared will also avoid running destructive | |
107 | ** memory self tests. (Not implemented yet) | |
108 | */ | |
109 | if (ftc_bitmap) { | |
110 | pdc_do_firm_test_reset(ftc_bitmap); | |
111 | } | |
112 | #endif | |
113 | /* set up a new led state on systems shipped with a LED State panel */ | |
114 | pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN); | |
115 | ||
116 | /* "Normal" system reset */ | |
117 | pdc_do_reset(); | |
118 | ||
119 | /* Nope...box should reset with just CMD_RESET now */ | |
120 | gsc_writel(CMD_RESET, COMMAND_GLOBAL); | |
121 | ||
122 | /* Wait for RESET to lay us to rest. */ | |
123 | while (1) ; | |
124 | ||
125 | } | |
126 | ||
1da177e4 LT |
127 | void machine_halt(void) |
128 | { | |
129 | /* | |
130 | ** The LED/ChassisCodes are updated by the led_halt() | |
131 | ** function, called by the reboot notifier chain. | |
132 | */ | |
133 | } | |
134 | ||
85509c00 | 135 | void (*chassis_power_off)(void); |
1da177e4 LT |
136 | |
137 | /* | |
138 | * This routine is called from sys_reboot to actually turn off the | |
139 | * machine | |
140 | */ | |
141 | void machine_power_off(void) | |
142 | { | |
143 | /* If there is a registered power off handler, call it. */ | |
85509c00 KM |
144 | if (chassis_power_off) |
145 | chassis_power_off(); | |
1da177e4 LT |
146 | |
147 | /* Put the soft power button back under hardware control. | |
148 | * If the user had already pressed the power button, the | |
149 | * following call will immediately power off. */ | |
150 | pdc_soft_power_button(0); | |
151 | ||
152 | pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN); | |
153 | ||
154 | /* It seems we have no way to power the system off via | |
155 | * software. The user has to press the button himself. */ | |
156 | ||
157 | printk(KERN_EMERG "System shut down completed.\n" | |
158 | KERN_EMERG "Please power this system off now."); | |
159 | } | |
160 | ||
85509c00 KM |
161 | void (*pm_power_off)(void) = machine_power_off; |
162 | EXPORT_SYMBOL(pm_power_off); | |
1da177e4 LT |
163 | |
164 | /* | |
165 | * Create a kernel thread | |
166 | */ | |
167 | ||
168 | extern pid_t __kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); | |
169 | pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) | |
170 | { | |
171 | ||
172 | /* | |
173 | * FIXME: Once we are sure we don't need any debug here, | |
174 | * kernel_thread can become a #define. | |
175 | */ | |
176 | ||
177 | return __kernel_thread(fn, arg, flags); | |
178 | } | |
179 | EXPORT_SYMBOL(kernel_thread); | |
180 | ||
181 | /* | |
182 | * Free current thread data structures etc.. | |
183 | */ | |
184 | void exit_thread(void) | |
185 | { | |
186 | } | |
187 | ||
188 | void flush_thread(void) | |
189 | { | |
190 | /* Only needs to handle fpu stuff or perf monitors. | |
191 | ** REVISIT: several arches implement a "lazy fpu state". | |
192 | */ | |
193 | set_fs(USER_DS); | |
194 | } | |
195 | ||
196 | void release_thread(struct task_struct *dead_task) | |
197 | { | |
198 | } | |
199 | ||
200 | /* | |
201 | * Fill in the FPU structure for a core dump. | |
202 | */ | |
203 | ||
204 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t *r) | |
205 | { | |
206 | if (regs == NULL) | |
207 | return 0; | |
208 | ||
209 | memcpy(r, regs->fr, sizeof *r); | |
210 | return 1; | |
211 | } | |
212 | ||
213 | int dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *r) | |
214 | { | |
215 | memcpy(r, tsk->thread.regs.fr, sizeof(*r)); | |
216 | return 1; | |
217 | } | |
218 | ||
219 | /* Note that "fork()" is implemented in terms of clone, with | |
220 | parameters (SIGCHLD, regs->gr[30], regs). */ | |
221 | int | |
222 | sys_clone(unsigned long clone_flags, unsigned long usp, | |
223 | struct pt_regs *regs) | |
224 | { | |
b2450cc1 CD |
225 | /* Arugments from userspace are: |
226 | r26 = Clone flags. | |
227 | r25 = Child stack. | |
228 | r24 = parent_tidptr. | |
229 | r23 = Is the TLS storage descriptor | |
230 | r22 = child_tidptr | |
231 | ||
232 | However, these last 3 args are only examined | |
233 | if the proper flags are set. */ | |
234 | int __user *child_tidptr; | |
235 | int __user *parent_tidptr; | |
1da177e4 LT |
236 | |
237 | /* usp must be word aligned. This also prevents users from | |
238 | * passing in the value 1 (which is the signal for a special | |
239 | * return for a kernel thread) */ | |
240 | usp = ALIGN(usp, 4); | |
241 | ||
242 | /* A zero value for usp means use the current stack */ | |
b2450cc1 CD |
243 | if (usp == 0) |
244 | usp = regs->gr[30]; | |
1da177e4 | 245 | |
b2450cc1 CD |
246 | if (clone_flags & CLONE_PARENT_SETTID) |
247 | parent_tidptr = (int __user *)regs->gr[24]; | |
248 | else | |
249 | parent_tidptr = NULL; | |
250 | ||
251 | if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) | |
252 | child_tidptr = (int __user *)regs->gr[22]; | |
253 | else | |
254 | child_tidptr = NULL; | |
255 | ||
256 | return do_fork(clone_flags, usp, regs, 0, parent_tidptr, child_tidptr); | |
1da177e4 LT |
257 | } |
258 | ||
259 | int | |
260 | sys_vfork(struct pt_regs *regs) | |
261 | { | |
262 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gr[30], regs, 0, NULL, NULL); | |
263 | } | |
264 | ||
265 | int | |
266 | copy_thread(int nr, unsigned long clone_flags, unsigned long usp, | |
267 | unsigned long unused, /* in ia64 this is "user_stack_size" */ | |
268 | struct task_struct * p, struct pt_regs * pregs) | |
269 | { | |
270 | struct pt_regs * cregs = &(p->thread.regs); | |
40f1f0de | 271 | void *stack = task_stack_page(p); |
1da177e4 LT |
272 | |
273 | /* We have to use void * instead of a function pointer, because | |
274 | * function pointers aren't a pointer to the function on 64-bit. | |
275 | * Make them const so the compiler knows they live in .text */ | |
276 | extern void * const ret_from_kernel_thread; | |
277 | extern void * const child_return; | |
278 | #ifdef CONFIG_HPUX | |
279 | extern void * const hpux_child_return; | |
280 | #endif | |
281 | ||
282 | *cregs = *pregs; | |
283 | ||
284 | /* Set the return value for the child. Note that this is not | |
285 | actually restored by the syscall exit path, but we put it | |
286 | here for consistency in case of signals. */ | |
287 | cregs->gr[28] = 0; /* child */ | |
288 | ||
289 | /* | |
290 | * We need to differentiate between a user fork and a | |
291 | * kernel fork. We can't use user_mode, because the | |
292 | * the syscall path doesn't save iaoq. Right now | |
293 | * We rely on the fact that kernel_thread passes | |
294 | * in zero for usp. | |
295 | */ | |
296 | if (usp == 1) { | |
297 | /* kernel thread */ | |
40f1f0de | 298 | cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN; |
1da177e4 LT |
299 | /* Must exit via ret_from_kernel_thread in order |
300 | * to call schedule_tail() | |
301 | */ | |
302 | cregs->kpc = (unsigned long) &ret_from_kernel_thread; | |
303 | /* | |
304 | * Copy function and argument to be called from | |
305 | * ret_from_kernel_thread. | |
306 | */ | |
a8f44e38 | 307 | #ifdef CONFIG_64BIT |
1da177e4 LT |
308 | cregs->gr[27] = pregs->gr[27]; |
309 | #endif | |
310 | cregs->gr[26] = pregs->gr[26]; | |
311 | cregs->gr[25] = pregs->gr[25]; | |
312 | } else { | |
313 | /* user thread */ | |
314 | /* | |
315 | * Note that the fork wrappers are responsible | |
316 | * for setting gr[21]. | |
317 | */ | |
318 | ||
319 | /* Use same stack depth as parent */ | |
40f1f0de | 320 | cregs->ksp = (unsigned long)stack |
1da177e4 LT |
321 | + (pregs->gr[21] & (THREAD_SIZE - 1)); |
322 | cregs->gr[30] = usp; | |
323 | if (p->personality == PER_HPUX) { | |
324 | #ifdef CONFIG_HPUX | |
325 | cregs->kpc = (unsigned long) &hpux_child_return; | |
326 | #else | |
327 | BUG(); | |
328 | #endif | |
329 | } else { | |
330 | cregs->kpc = (unsigned long) &child_return; | |
331 | } | |
b2450cc1 CD |
332 | /* Setup thread TLS area from the 4th parameter in clone */ |
333 | if (clone_flags & CLONE_SETTLS) | |
334 | cregs->cr27 = pregs->gr[23]; | |
335 | ||
1da177e4 LT |
336 | } |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
341 | unsigned long thread_saved_pc(struct task_struct *t) | |
342 | { | |
343 | return t->thread.regs.kpc; | |
344 | } | |
345 | ||
346 | /* | |
347 | * sys_execve() executes a new program. | |
348 | */ | |
349 | ||
350 | asmlinkage int sys_execve(struct pt_regs *regs) | |
351 | { | |
352 | int error; | |
353 | char *filename; | |
354 | ||
355 | filename = getname((const char __user *) regs->gr[26]); | |
356 | error = PTR_ERR(filename); | |
357 | if (IS_ERR(filename)) | |
358 | goto out; | |
c2c4798e MW |
359 | error = do_execve(filename, (char __user * __user *) regs->gr[25], |
360 | (char __user * __user *) regs->gr[24], regs); | |
1da177e4 LT |
361 | if (error == 0) { |
362 | task_lock(current); | |
363 | current->ptrace &= ~PT_DTRACE; | |
364 | task_unlock(current); | |
365 | } | |
366 | putname(filename); | |
367 | out: | |
368 | ||
369 | return error; | |
370 | } | |
371 | ||
3db03b4a AB |
372 | extern int __execve(const char *filename, char *const argv[], |
373 | char *const envp[], struct task_struct *task); | |
374 | int kernel_execve(const char *filename, char *const argv[], char *const envp[]) | |
375 | { | |
376 | return __execve(filename, argv, envp, current); | |
377 | } | |
378 | ||
379 | unsigned long | |
1da177e4 LT |
380 | get_wchan(struct task_struct *p) |
381 | { | |
382 | struct unwind_frame_info info; | |
383 | unsigned long ip; | |
384 | int count = 0; | |
cc650a7a KM |
385 | |
386 | if (!p || p == current || p->state == TASK_RUNNING) | |
387 | return 0; | |
388 | ||
1da177e4 LT |
389 | /* |
390 | * These bracket the sleeping functions.. | |
391 | */ | |
392 | ||
393 | unwind_frame_init_from_blocked_task(&info, p); | |
394 | do { | |
395 | if (unwind_once(&info) < 0) | |
396 | return 0; | |
397 | ip = info.ip; | |
398 | if (!in_sched_functions(ip)) | |
399 | return ip; | |
400 | } while (count++ < 16); | |
401 | return 0; | |
402 | } |