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> |
1da177e4 LT |
51 | |
52 | #include <asm/io.h> | |
0013a854 | 53 | #include <asm/asm-offsets.h> |
1da177e4 LT |
54 | #include <asm/pdc.h> |
55 | #include <asm/pdc_chassis.h> | |
56 | #include <asm/pgalloc.h> | |
1da177e4 | 57 | #include <asm/unwind.h> |
b609308e | 58 | #include <asm/sections.h> |
1da177e4 | 59 | |
1da177e4 LT |
60 | /* |
61 | * The idle thread. There's no useful work to be | |
62 | * done, so just try to conserve power and have a | |
63 | * low exit latency (ie sit in a loop waiting for | |
64 | * somebody to say that they'd like to reschedule) | |
65 | */ | |
66 | void cpu_idle(void) | |
67 | { | |
64c7c8f8 NP |
68 | set_thread_flag(TIF_POLLING_NRFLAG); |
69 | ||
1da177e4 LT |
70 | /* endless idle loop with no priority at all */ |
71 | while (1) { | |
72 | while (!need_resched()) | |
73 | barrier(); | |
bd2f5536 | 74 | schedule_preempt_disabled(); |
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" | |
ad361c98 | 158 | "Please power this system off now."); |
1da177e4 LT |
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 | */ | |
1da177e4 LT |
193 | } |
194 | ||
195 | void release_thread(struct task_struct *dead_task) | |
196 | { | |
197 | } | |
198 | ||
199 | /* | |
200 | * Fill in the FPU structure for a core dump. | |
201 | */ | |
202 | ||
203 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t *r) | |
204 | { | |
205 | if (regs == NULL) | |
206 | return 0; | |
207 | ||
208 | memcpy(r, regs->fr, sizeof *r); | |
209 | return 1; | |
210 | } | |
211 | ||
212 | int dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *r) | |
213 | { | |
214 | memcpy(r, tsk->thread.regs.fr, sizeof(*r)); | |
215 | return 1; | |
216 | } | |
217 | ||
218 | /* Note that "fork()" is implemented in terms of clone, with | |
219 | parameters (SIGCHLD, regs->gr[30], regs). */ | |
220 | int | |
221 | sys_clone(unsigned long clone_flags, unsigned long usp, | |
222 | struct pt_regs *regs) | |
223 | { | |
b2450cc1 CD |
224 | /* Arugments from userspace are: |
225 | r26 = Clone flags. | |
226 | r25 = Child stack. | |
227 | r24 = parent_tidptr. | |
228 | r23 = Is the TLS storage descriptor | |
229 | r22 = child_tidptr | |
230 | ||
231 | However, these last 3 args are only examined | |
232 | if the proper flags are set. */ | |
803094f4 HD |
233 | int __user *parent_tidptr = (int __user *)regs->gr[24]; |
234 | int __user *child_tidptr = (int __user *)regs->gr[22]; | |
1da177e4 LT |
235 | |
236 | /* usp must be word aligned. This also prevents users from | |
237 | * passing in the value 1 (which is the signal for a special | |
238 | * return for a kernel thread) */ | |
239 | usp = ALIGN(usp, 4); | |
240 | ||
241 | /* A zero value for usp means use the current stack */ | |
b2450cc1 CD |
242 | if (usp == 0) |
243 | usp = regs->gr[30]; | |
1da177e4 | 244 | |
b2450cc1 | 245 | return do_fork(clone_flags, usp, regs, 0, parent_tidptr, child_tidptr); |
1da177e4 LT |
246 | } |
247 | ||
248 | int | |
249 | sys_vfork(struct pt_regs *regs) | |
250 | { | |
251 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gr[30], regs, 0, NULL, NULL); | |
252 | } | |
253 | ||
254 | int | |
6f2c55b8 | 255 | copy_thread(unsigned long clone_flags, unsigned long usp, |
1da177e4 LT |
256 | unsigned long unused, /* in ia64 this is "user_stack_size" */ |
257 | struct task_struct * p, struct pt_regs * pregs) | |
258 | { | |
259 | struct pt_regs * cregs = &(p->thread.regs); | |
40f1f0de | 260 | void *stack = task_stack_page(p); |
1da177e4 LT |
261 | |
262 | /* We have to use void * instead of a function pointer, because | |
263 | * function pointers aren't a pointer to the function on 64-bit. | |
264 | * Make them const so the compiler knows they live in .text */ | |
265 | extern void * const ret_from_kernel_thread; | |
266 | extern void * const child_return; | |
267 | #ifdef CONFIG_HPUX | |
268 | extern void * const hpux_child_return; | |
269 | #endif | |
270 | ||
271 | *cregs = *pregs; | |
272 | ||
273 | /* Set the return value for the child. Note that this is not | |
274 | actually restored by the syscall exit path, but we put it | |
275 | here for consistency in case of signals. */ | |
276 | cregs->gr[28] = 0; /* child */ | |
277 | ||
278 | /* | |
279 | * We need to differentiate between a user fork and a | |
280 | * kernel fork. We can't use user_mode, because the | |
281 | * the syscall path doesn't save iaoq. Right now | |
282 | * We rely on the fact that kernel_thread passes | |
283 | * in zero for usp. | |
284 | */ | |
285 | if (usp == 1) { | |
286 | /* kernel thread */ | |
40f1f0de | 287 | cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN; |
1da177e4 LT |
288 | /* Must exit via ret_from_kernel_thread in order |
289 | * to call schedule_tail() | |
290 | */ | |
291 | cregs->kpc = (unsigned long) &ret_from_kernel_thread; | |
292 | /* | |
293 | * Copy function and argument to be called from | |
294 | * ret_from_kernel_thread. | |
295 | */ | |
a8f44e38 | 296 | #ifdef CONFIG_64BIT |
1da177e4 LT |
297 | cregs->gr[27] = pregs->gr[27]; |
298 | #endif | |
299 | cregs->gr[26] = pregs->gr[26]; | |
300 | cregs->gr[25] = pregs->gr[25]; | |
301 | } else { | |
302 | /* user thread */ | |
303 | /* | |
304 | * Note that the fork wrappers are responsible | |
305 | * for setting gr[21]. | |
306 | */ | |
307 | ||
308 | /* Use same stack depth as parent */ | |
40f1f0de | 309 | cregs->ksp = (unsigned long)stack |
1da177e4 LT |
310 | + (pregs->gr[21] & (THREAD_SIZE - 1)); |
311 | cregs->gr[30] = usp; | |
312 | if (p->personality == PER_HPUX) { | |
313 | #ifdef CONFIG_HPUX | |
314 | cregs->kpc = (unsigned long) &hpux_child_return; | |
315 | #else | |
316 | BUG(); | |
317 | #endif | |
318 | } else { | |
319 | cregs->kpc = (unsigned long) &child_return; | |
320 | } | |
b2450cc1 CD |
321 | /* Setup thread TLS area from the 4th parameter in clone */ |
322 | if (clone_flags & CLONE_SETTLS) | |
323 | cregs->cr27 = pregs->gr[23]; | |
324 | ||
1da177e4 LT |
325 | } |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
330 | unsigned long thread_saved_pc(struct task_struct *t) | |
331 | { | |
332 | return t->thread.regs.kpc; | |
333 | } | |
334 | ||
335 | /* | |
336 | * sys_execve() executes a new program. | |
337 | */ | |
338 | ||
339 | asmlinkage int sys_execve(struct pt_regs *regs) | |
340 | { | |
341 | int error; | |
342 | char *filename; | |
343 | ||
344 | filename = getname((const char __user *) regs->gr[26]); | |
345 | error = PTR_ERR(filename); | |
346 | if (IS_ERR(filename)) | |
347 | goto out; | |
d7627467 DH |
348 | error = do_execve(filename, |
349 | (const char __user *const __user *) regs->gr[25], | |
350 | (const char __user *const __user *) regs->gr[24], | |
351 | regs); | |
1da177e4 LT |
352 | putname(filename); |
353 | out: | |
354 | ||
355 | return error; | |
356 | } | |
357 | ||
d7627467 DH |
358 | extern int __execve(const char *filename, |
359 | const char *const argv[], | |
360 | const char *const envp[], struct task_struct *task); | |
361 | int kernel_execve(const char *filename, | |
362 | const char *const argv[], | |
363 | const char *const envp[]) | |
3db03b4a AB |
364 | { |
365 | return __execve(filename, argv, envp, current); | |
366 | } | |
367 | ||
368 | unsigned long | |
1da177e4 LT |
369 | get_wchan(struct task_struct *p) |
370 | { | |
371 | struct unwind_frame_info info; | |
372 | unsigned long ip; | |
373 | int count = 0; | |
cc650a7a KM |
374 | |
375 | if (!p || p == current || p->state == TASK_RUNNING) | |
376 | return 0; | |
377 | ||
1da177e4 LT |
378 | /* |
379 | * These bracket the sleeping functions.. | |
380 | */ | |
381 | ||
382 | unwind_frame_init_from_blocked_task(&info, p); | |
383 | do { | |
384 | if (unwind_once(&info) < 0) | |
385 | return 0; | |
386 | ip = info.ip; | |
387 | if (!in_sched_functions(ip)) | |
388 | return ip; | |
389 | } while (count++ < 16); | |
390 | return 0; | |
391 | } | |
b609308e KM |
392 | |
393 | #ifdef CONFIG_64BIT | |
394 | void *dereference_function_descriptor(void *ptr) | |
395 | { | |
396 | Elf64_Fdesc *desc = ptr; | |
397 | void *p; | |
398 | ||
399 | if (!probe_kernel_address(&desc->addr, p)) | |
400 | ptr = p; | |
401 | return ptr; | |
402 | } | |
403 | #endif |