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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> | |
9dabf60d | 16 | * Copyright (C) 2001-2014 Helge Deller <deller@gmx.de> |
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> | |
b17b0153 | 46 | #include <linux/sched/debug.h> |
29930025 | 47 | #include <linux/sched/task.h> |
5a0e3ad6 | 48 | #include <linux/slab.h> |
1da177e4 LT |
49 | #include <linux/stddef.h> |
50 | #include <linux/unistd.h> | |
51 | #include <linux/kallsyms.h> | |
b609308e | 52 | #include <linux/uaccess.h> |
fbe75218 | 53 | #include <linux/rcupdate.h> |
9dabf60d | 54 | #include <linux/random.h> |
1da177e4 LT |
55 | |
56 | #include <asm/io.h> | |
0013a854 | 57 | #include <asm/asm-offsets.h> |
ff0ab8af | 58 | #include <asm/assembly.h> |
1da177e4 LT |
59 | #include <asm/pdc.h> |
60 | #include <asm/pdc_chassis.h> | |
61 | #include <asm/pgalloc.h> | |
1da177e4 | 62 | #include <asm/unwind.h> |
b609308e | 63 | #include <asm/sections.h> |
1da177e4 | 64 | |
10992092 | 65 | #define COMMAND_GLOBAL F_EXTEND(0xfffe0030) |
1da177e4 LT |
66 | #define CMD_RESET 5 /* reset any module */ |
67 | ||
68 | /* | |
69 | ** The Wright Brothers and Gecko systems have a H/W problem | |
70 | ** (Lasi...'nuf said) may cause a broadcast reset to lockup | |
71 | ** the system. An HVERSION dependent PDC call was developed | |
72 | ** to perform a "safe", platform specific broadcast reset instead | |
73 | ** of kludging up all the code. | |
74 | ** | |
75 | ** Older machines which do not implement PDC_BROADCAST_RESET will | |
76 | ** return (with an error) and the regular broadcast reset can be | |
77 | ** issued. Obviously, if the PDC does implement PDC_BROADCAST_RESET | |
78 | ** the PDC call will not return (the system will be reset). | |
79 | */ | |
80 | void machine_restart(char *cmd) | |
81 | { | |
82 | #ifdef FASTBOOT_SELFTEST_SUPPORT | |
83 | /* | |
84 | ** If user has modified the Firmware Selftest Bitmap, | |
85 | ** run the tests specified in the bitmap after the | |
86 | ** system is rebooted w/PDC_DO_RESET. | |
87 | ** | |
88 | ** ftc_bitmap = 0x1AUL "Skip destructive memory tests" | |
89 | ** | |
90 | ** Using "directed resets" at each processor with the MEM_TOC | |
91 | ** vector cleared will also avoid running destructive | |
92 | ** memory self tests. (Not implemented yet) | |
93 | */ | |
94 | if (ftc_bitmap) { | |
95 | pdc_do_firm_test_reset(ftc_bitmap); | |
96 | } | |
97 | #endif | |
98 | /* set up a new led state on systems shipped with a LED State panel */ | |
99 | pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN); | |
100 | ||
101 | /* "Normal" system reset */ | |
102 | pdc_do_reset(); | |
103 | ||
104 | /* Nope...box should reset with just CMD_RESET now */ | |
105 | gsc_writel(CMD_RESET, COMMAND_GLOBAL); | |
106 | ||
107 | /* Wait for RESET to lay us to rest. */ | |
108 | while (1) ; | |
109 | ||
110 | } | |
111 | ||
1da177e4 LT |
112 | void machine_halt(void) |
113 | { | |
114 | /* | |
115 | ** The LED/ChassisCodes are updated by the led_halt() | |
116 | ** function, called by the reboot notifier chain. | |
117 | */ | |
118 | } | |
119 | ||
85509c00 | 120 | void (*chassis_power_off)(void); |
1da177e4 LT |
121 | |
122 | /* | |
123 | * This routine is called from sys_reboot to actually turn off the | |
124 | * machine | |
125 | */ | |
126 | void machine_power_off(void) | |
127 | { | |
128 | /* If there is a registered power off handler, call it. */ | |
85509c00 KM |
129 | if (chassis_power_off) |
130 | chassis_power_off(); | |
1da177e4 LT |
131 | |
132 | /* Put the soft power button back under hardware control. | |
133 | * If the user had already pressed the power button, the | |
134 | * following call will immediately power off. */ | |
135 | pdc_soft_power_button(0); | |
136 | ||
137 | pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN); | |
138 | ||
139 | /* It seems we have no way to power the system off via | |
140 | * software. The user has to press the button himself. */ | |
141 | ||
142 | printk(KERN_EMERG "System shut down completed.\n" | |
ad361c98 | 143 | "Please power this system off now."); |
1da177e4 LT |
144 | } |
145 | ||
85509c00 KM |
146 | void (*pm_power_off)(void) = machine_power_off; |
147 | EXPORT_SYMBOL(pm_power_off); | |
1da177e4 | 148 | |
1da177e4 LT |
149 | void flush_thread(void) |
150 | { | |
151 | /* Only needs to handle fpu stuff or perf monitors. | |
152 | ** REVISIT: several arches implement a "lazy fpu state". | |
153 | */ | |
1da177e4 LT |
154 | } |
155 | ||
156 | void release_thread(struct task_struct *dead_task) | |
157 | { | |
158 | } | |
159 | ||
160 | /* | |
161 | * Fill in the FPU structure for a core dump. | |
162 | */ | |
163 | ||
164 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t *r) | |
165 | { | |
166 | if (regs == NULL) | |
167 | return 0; | |
168 | ||
169 | memcpy(r, regs->fr, sizeof *r); | |
170 | return 1; | |
171 | } | |
172 | ||
173 | int dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *r) | |
174 | { | |
175 | memcpy(r, tsk->thread.regs.fr, sizeof(*r)); | |
176 | return 1; | |
177 | } | |
178 | ||
5fec97d0 AD |
179 | /* |
180 | * Copy architecture-specific thread state | |
181 | */ | |
1da177e4 | 182 | int |
6f2c55b8 | 183 | copy_thread(unsigned long clone_flags, unsigned long usp, |
5fec97d0 | 184 | unsigned long kthread_arg, struct task_struct *p) |
1da177e4 | 185 | { |
afa86fc4 | 186 | struct pt_regs *cregs = &(p->thread.regs); |
40f1f0de | 187 | void *stack = task_stack_page(p); |
1da177e4 LT |
188 | |
189 | /* We have to use void * instead of a function pointer, because | |
190 | * function pointers aren't a pointer to the function on 64-bit. | |
191 | * Make them const so the compiler knows they live in .text */ | |
192 | extern void * const ret_from_kernel_thread; | |
193 | extern void * const child_return; | |
c78c2b7e | 194 | |
ff0ab8af | 195 | if (unlikely(p->flags & PF_KTHREAD)) { |
5fec97d0 | 196 | /* kernel thread */ |
a44e060f | 197 | memset(cregs, 0, sizeof(struct pt_regs)); |
ff0ab8af AV |
198 | if (!usp) /* idle thread */ |
199 | return 0; | |
1da177e4 LT |
200 | /* Must exit via ret_from_kernel_thread in order |
201 | * to call schedule_tail() | |
202 | */ | |
ff0ab8af | 203 | cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE; |
1da177e4 LT |
204 | cregs->kpc = (unsigned long) &ret_from_kernel_thread; |
205 | /* | |
206 | * Copy function and argument to be called from | |
207 | * ret_from_kernel_thread. | |
208 | */ | |
a8f44e38 | 209 | #ifdef CONFIG_64BIT |
a44e060f AV |
210 | cregs->gr[27] = ((unsigned long *)usp)[3]; |
211 | cregs->gr[26] = ((unsigned long *)usp)[2]; | |
212 | #else | |
213 | cregs->gr[26] = usp; | |
1da177e4 | 214 | #endif |
5fec97d0 | 215 | cregs->gr[25] = kthread_arg; |
1da177e4 LT |
216 | } else { |
217 | /* user thread */ | |
415bfae9 AV |
218 | /* usp must be word aligned. This also prevents users from |
219 | * passing in the value 1 (which is the signal for a special | |
220 | * return for a kernel thread) */ | |
221 | if (usp) { | |
222 | usp = ALIGN(usp, 4); | |
223 | if (likely(usp)) | |
224 | cregs->gr[30] = usp; | |
225 | } | |
ff0ab8af | 226 | cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE; |
c78c2b7e HD |
227 | cregs->kpc = (unsigned long) &child_return; |
228 | ||
b2450cc1 CD |
229 | /* Setup thread TLS area from the 4th parameter in clone */ |
230 | if (clone_flags & CLONE_SETTLS) | |
415bfae9 | 231 | cregs->cr27 = cregs->gr[23]; |
1da177e4 LT |
232 | } |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | unsigned long thread_saved_pc(struct task_struct *t) | |
238 | { | |
239 | return t->thread.regs.kpc; | |
240 | } | |
241 | ||
3db03b4a | 242 | unsigned long |
1da177e4 LT |
243 | get_wchan(struct task_struct *p) |
244 | { | |
245 | struct unwind_frame_info info; | |
246 | unsigned long ip; | |
247 | int count = 0; | |
cc650a7a KM |
248 | |
249 | if (!p || p == current || p->state == TASK_RUNNING) | |
250 | return 0; | |
251 | ||
1da177e4 LT |
252 | /* |
253 | * These bracket the sleeping functions.. | |
254 | */ | |
255 | ||
256 | unwind_frame_init_from_blocked_task(&info, p); | |
257 | do { | |
258 | if (unwind_once(&info) < 0) | |
259 | return 0; | |
260 | ip = info.ip; | |
261 | if (!in_sched_functions(ip)) | |
262 | return ip; | |
263 | } while (count++ < 16); | |
264 | return 0; | |
265 | } | |
b609308e KM |
266 | |
267 | #ifdef CONFIG_64BIT | |
268 | void *dereference_function_descriptor(void *ptr) | |
269 | { | |
270 | Elf64_Fdesc *desc = ptr; | |
271 | void *p; | |
272 | ||
273 | if (!probe_kernel_address(&desc->addr, p)) | |
274 | ptr = p; | |
275 | return ptr; | |
276 | } | |
277 | #endif | |
9dabf60d HD |
278 | |
279 | static inline unsigned long brk_rnd(void) | |
280 | { | |
18d98a79 | 281 | return (get_random_int() & BRK_RND_MASK) << PAGE_SHIFT; |
9dabf60d HD |
282 | } |
283 | ||
284 | unsigned long arch_randomize_brk(struct mm_struct *mm) | |
285 | { | |
286 | unsigned long ret = PAGE_ALIGN(mm->brk + brk_rnd()); | |
287 | ||
288 | if (ret < mm->brk) | |
289 | return mm->brk; | |
290 | return ret; | |
291 | } |