Commit | Line | Data |
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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> | |
5a0e3ad6 | 46 | #include <linux/slab.h> |
1da177e4 LT |
47 | #include <linux/stddef.h> |
48 | #include <linux/unistd.h> | |
49 | #include <linux/kallsyms.h> | |
b609308e | 50 | #include <linux/uaccess.h> |
fbe75218 | 51 | #include <linux/rcupdate.h> |
1da177e4 LT |
52 | |
53 | #include <asm/io.h> | |
0013a854 | 54 | #include <asm/asm-offsets.h> |
1da177e4 LT |
55 | #include <asm/pdc.h> |
56 | #include <asm/pdc_chassis.h> | |
57 | #include <asm/pgalloc.h> | |
1da177e4 | 58 | #include <asm/unwind.h> |
b609308e | 59 | #include <asm/sections.h> |
1da177e4 | 60 | |
1da177e4 LT |
61 | /* |
62 | * The idle thread. There's no useful work to be | |
63 | * done, so just try to conserve power and have a | |
64 | * low exit latency (ie sit in a loop waiting for | |
65 | * somebody to say that they'd like to reschedule) | |
66 | */ | |
67 | void cpu_idle(void) | |
68 | { | |
64c7c8f8 NP |
69 | set_thread_flag(TIF_POLLING_NRFLAG); |
70 | ||
1da177e4 LT |
71 | /* endless idle loop with no priority at all */ |
72 | while (1) { | |
fbe75218 | 73 | rcu_idle_enter(); |
1da177e4 LT |
74 | while (!need_resched()) |
75 | barrier(); | |
fbe75218 | 76 | rcu_idle_exit(); |
bd2f5536 | 77 | schedule_preempt_disabled(); |
1da177e4 LT |
78 | check_pgt_cache(); |
79 | } | |
80 | } | |
81 | ||
82 | ||
10992092 | 83 | #define COMMAND_GLOBAL F_EXTEND(0xfffe0030) |
1da177e4 LT |
84 | #define CMD_RESET 5 /* reset any module */ |
85 | ||
86 | /* | |
87 | ** The Wright Brothers and Gecko systems have a H/W problem | |
88 | ** (Lasi...'nuf said) may cause a broadcast reset to lockup | |
89 | ** the system. An HVERSION dependent PDC call was developed | |
90 | ** to perform a "safe", platform specific broadcast reset instead | |
91 | ** of kludging up all the code. | |
92 | ** | |
93 | ** Older machines which do not implement PDC_BROADCAST_RESET will | |
94 | ** return (with an error) and the regular broadcast reset can be | |
95 | ** issued. Obviously, if the PDC does implement PDC_BROADCAST_RESET | |
96 | ** the PDC call will not return (the system will be reset). | |
97 | */ | |
98 | void machine_restart(char *cmd) | |
99 | { | |
100 | #ifdef FASTBOOT_SELFTEST_SUPPORT | |
101 | /* | |
102 | ** If user has modified the Firmware Selftest Bitmap, | |
103 | ** run the tests specified in the bitmap after the | |
104 | ** system is rebooted w/PDC_DO_RESET. | |
105 | ** | |
106 | ** ftc_bitmap = 0x1AUL "Skip destructive memory tests" | |
107 | ** | |
108 | ** Using "directed resets" at each processor with the MEM_TOC | |
109 | ** vector cleared will also avoid running destructive | |
110 | ** memory self tests. (Not implemented yet) | |
111 | */ | |
112 | if (ftc_bitmap) { | |
113 | pdc_do_firm_test_reset(ftc_bitmap); | |
114 | } | |
115 | #endif | |
116 | /* set up a new led state on systems shipped with a LED State panel */ | |
117 | pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN); | |
118 | ||
119 | /* "Normal" system reset */ | |
120 | pdc_do_reset(); | |
121 | ||
122 | /* Nope...box should reset with just CMD_RESET now */ | |
123 | gsc_writel(CMD_RESET, COMMAND_GLOBAL); | |
124 | ||
125 | /* Wait for RESET to lay us to rest. */ | |
126 | while (1) ; | |
127 | ||
128 | } | |
129 | ||
1da177e4 LT |
130 | void machine_halt(void) |
131 | { | |
132 | /* | |
133 | ** The LED/ChassisCodes are updated by the led_halt() | |
134 | ** function, called by the reboot notifier chain. | |
135 | */ | |
136 | } | |
137 | ||
85509c00 | 138 | void (*chassis_power_off)(void); |
1da177e4 LT |
139 | |
140 | /* | |
141 | * This routine is called from sys_reboot to actually turn off the | |
142 | * machine | |
143 | */ | |
144 | void machine_power_off(void) | |
145 | { | |
146 | /* If there is a registered power off handler, call it. */ | |
85509c00 KM |
147 | if (chassis_power_off) |
148 | chassis_power_off(); | |
1da177e4 LT |
149 | |
150 | /* Put the soft power button back under hardware control. | |
151 | * If the user had already pressed the power button, the | |
152 | * following call will immediately power off. */ | |
153 | pdc_soft_power_button(0); | |
154 | ||
155 | pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN); | |
156 | ||
157 | /* It seems we have no way to power the system off via | |
158 | * software. The user has to press the button himself. */ | |
159 | ||
160 | printk(KERN_EMERG "System shut down completed.\n" | |
ad361c98 | 161 | "Please power this system off now."); |
1da177e4 LT |
162 | } |
163 | ||
85509c00 KM |
164 | void (*pm_power_off)(void) = machine_power_off; |
165 | EXPORT_SYMBOL(pm_power_off); | |
1da177e4 LT |
166 | |
167 | /* | |
168 | * Create a kernel thread | |
169 | */ | |
170 | ||
171 | extern pid_t __kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); | |
172 | pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) | |
173 | { | |
174 | ||
175 | /* | |
176 | * FIXME: Once we are sure we don't need any debug here, | |
177 | * kernel_thread can become a #define. | |
178 | */ | |
179 | ||
180 | return __kernel_thread(fn, arg, flags); | |
181 | } | |
182 | EXPORT_SYMBOL(kernel_thread); | |
183 | ||
184 | /* | |
185 | * Free current thread data structures etc.. | |
186 | */ | |
187 | void exit_thread(void) | |
188 | { | |
189 | } | |
190 | ||
191 | void flush_thread(void) | |
192 | { | |
193 | /* Only needs to handle fpu stuff or perf monitors. | |
194 | ** REVISIT: several arches implement a "lazy fpu state". | |
195 | */ | |
1da177e4 LT |
196 | } |
197 | ||
198 | void release_thread(struct task_struct *dead_task) | |
199 | { | |
200 | } | |
201 | ||
202 | /* | |
203 | * Fill in the FPU structure for a core dump. | |
204 | */ | |
205 | ||
206 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t *r) | |
207 | { | |
208 | if (regs == NULL) | |
209 | return 0; | |
210 | ||
211 | memcpy(r, regs->fr, sizeof *r); | |
212 | return 1; | |
213 | } | |
214 | ||
215 | int dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *r) | |
216 | { | |
217 | memcpy(r, tsk->thread.regs.fr, sizeof(*r)); | |
218 | return 1; | |
219 | } | |
220 | ||
221 | /* Note that "fork()" is implemented in terms of clone, with | |
222 | parameters (SIGCHLD, regs->gr[30], regs). */ | |
223 | int | |
224 | sys_clone(unsigned long clone_flags, unsigned long usp, | |
225 | struct pt_regs *regs) | |
226 | { | |
b2450cc1 CD |
227 | /* Arugments from userspace are: |
228 | r26 = Clone flags. | |
229 | r25 = Child stack. | |
230 | r24 = parent_tidptr. | |
231 | r23 = Is the TLS storage descriptor | |
232 | r22 = child_tidptr | |
233 | ||
234 | However, these last 3 args are only examined | |
235 | if the proper flags are set. */ | |
803094f4 HD |
236 | int __user *parent_tidptr = (int __user *)regs->gr[24]; |
237 | int __user *child_tidptr = (int __user *)regs->gr[22]; | |
1da177e4 LT |
238 | |
239 | /* usp must be word aligned. This also prevents users from | |
240 | * passing in the value 1 (which is the signal for a special | |
241 | * return for a kernel thread) */ | |
242 | usp = ALIGN(usp, 4); | |
243 | ||
244 | /* A zero value for usp means use the current stack */ | |
b2450cc1 CD |
245 | if (usp == 0) |
246 | usp = regs->gr[30]; | |
1da177e4 | 247 | |
b2450cc1 | 248 | return do_fork(clone_flags, usp, regs, 0, parent_tidptr, child_tidptr); |
1da177e4 LT |
249 | } |
250 | ||
251 | int | |
252 | sys_vfork(struct pt_regs *regs) | |
253 | { | |
254 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gr[30], regs, 0, NULL, NULL); | |
255 | } | |
256 | ||
257 | int | |
6f2c55b8 | 258 | copy_thread(unsigned long clone_flags, unsigned long usp, |
1da177e4 LT |
259 | unsigned long unused, /* in ia64 this is "user_stack_size" */ |
260 | struct task_struct * p, struct pt_regs * pregs) | |
261 | { | |
262 | struct pt_regs * cregs = &(p->thread.regs); | |
40f1f0de | 263 | void *stack = task_stack_page(p); |
1da177e4 LT |
264 | |
265 | /* We have to use void * instead of a function pointer, because | |
266 | * function pointers aren't a pointer to the function on 64-bit. | |
267 | * Make them const so the compiler knows they live in .text */ | |
268 | extern void * const ret_from_kernel_thread; | |
269 | extern void * const child_return; | |
270 | #ifdef CONFIG_HPUX | |
271 | extern void * const hpux_child_return; | |
272 | #endif | |
273 | ||
274 | *cregs = *pregs; | |
275 | ||
276 | /* Set the return value for the child. Note that this is not | |
277 | actually restored by the syscall exit path, but we put it | |
278 | here for consistency in case of signals. */ | |
279 | cregs->gr[28] = 0; /* child */ | |
280 | ||
281 | /* | |
282 | * We need to differentiate between a user fork and a | |
283 | * kernel fork. We can't use user_mode, because the | |
284 | * the syscall path doesn't save iaoq. Right now | |
285 | * We rely on the fact that kernel_thread passes | |
286 | * in zero for usp. | |
287 | */ | |
288 | if (usp == 1) { | |
289 | /* kernel thread */ | |
40f1f0de | 290 | cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN; |
1da177e4 LT |
291 | /* Must exit via ret_from_kernel_thread in order |
292 | * to call schedule_tail() | |
293 | */ | |
294 | cregs->kpc = (unsigned long) &ret_from_kernel_thread; | |
295 | /* | |
296 | * Copy function and argument to be called from | |
297 | * ret_from_kernel_thread. | |
298 | */ | |
a8f44e38 | 299 | #ifdef CONFIG_64BIT |
1da177e4 LT |
300 | cregs->gr[27] = pregs->gr[27]; |
301 | #endif | |
302 | cregs->gr[26] = pregs->gr[26]; | |
303 | cregs->gr[25] = pregs->gr[25]; | |
304 | } else { | |
305 | /* user thread */ | |
306 | /* | |
307 | * Note that the fork wrappers are responsible | |
308 | * for setting gr[21]. | |
309 | */ | |
310 | ||
311 | /* Use same stack depth as parent */ | |
40f1f0de | 312 | cregs->ksp = (unsigned long)stack |
1da177e4 LT |
313 | + (pregs->gr[21] & (THREAD_SIZE - 1)); |
314 | cregs->gr[30] = usp; | |
5b24c421 | 315 | if (personality(p->personality) == PER_HPUX) { |
1da177e4 LT |
316 | #ifdef CONFIG_HPUX |
317 | cregs->kpc = (unsigned long) &hpux_child_return; | |
318 | #else | |
319 | BUG(); | |
320 | #endif | |
321 | } else { | |
322 | cregs->kpc = (unsigned long) &child_return; | |
323 | } | |
b2450cc1 CD |
324 | /* Setup thread TLS area from the 4th parameter in clone */ |
325 | if (clone_flags & CLONE_SETTLS) | |
326 | cregs->cr27 = pregs->gr[23]; | |
327 | ||
1da177e4 LT |
328 | } |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
333 | unsigned long thread_saved_pc(struct task_struct *t) | |
334 | { | |
335 | return t->thread.regs.kpc; | |
336 | } | |
337 | ||
338 | /* | |
339 | * sys_execve() executes a new program. | |
340 | */ | |
341 | ||
342 | asmlinkage int sys_execve(struct pt_regs *regs) | |
343 | { | |
344 | int error; | |
91a27b2a | 345 | struct filename *filename; |
1da177e4 LT |
346 | |
347 | filename = getname((const char __user *) regs->gr[26]); | |
348 | error = PTR_ERR(filename); | |
349 | if (IS_ERR(filename)) | |
350 | goto out; | |
91a27b2a | 351 | error = do_execve(filename->name, |
d7627467 DH |
352 | (const char __user *const __user *) regs->gr[25], |
353 | (const char __user *const __user *) regs->gr[24], | |
354 | regs); | |
1da177e4 LT |
355 | putname(filename); |
356 | out: | |
357 | ||
358 | return error; | |
359 | } | |
360 | ||
d7627467 DH |
361 | extern int __execve(const char *filename, |
362 | const char *const argv[], | |
363 | const char *const envp[], struct task_struct *task); | |
364 | int kernel_execve(const char *filename, | |
365 | const char *const argv[], | |
366 | const char *const envp[]) | |
3db03b4a AB |
367 | { |
368 | return __execve(filename, argv, envp, current); | |
369 | } | |
370 | ||
371 | unsigned long | |
1da177e4 LT |
372 | get_wchan(struct task_struct *p) |
373 | { | |
374 | struct unwind_frame_info info; | |
375 | unsigned long ip; | |
376 | int count = 0; | |
cc650a7a KM |
377 | |
378 | if (!p || p == current || p->state == TASK_RUNNING) | |
379 | return 0; | |
380 | ||
1da177e4 LT |
381 | /* |
382 | * These bracket the sleeping functions.. | |
383 | */ | |
384 | ||
385 | unwind_frame_init_from_blocked_task(&info, p); | |
386 | do { | |
387 | if (unwind_once(&info) < 0) | |
388 | return 0; | |
389 | ip = info.ip; | |
390 | if (!in_sched_functions(ip)) | |
391 | return ip; | |
392 | } while (count++ < 16); | |
393 | return 0; | |
394 | } | |
b609308e KM |
395 | |
396 | #ifdef CONFIG_64BIT | |
397 | void *dereference_function_descriptor(void *ptr) | |
398 | { | |
399 | Elf64_Fdesc *desc = ptr; | |
400 | void *p; | |
401 | ||
402 | if (!probe_kernel_address(&desc->addr, p)) | |
403 | ptr = p; | |
404 | return ptr; | |
405 | } | |
406 | #endif |