blob: 005ed44d4a8ec4db5e39055709ac912a81028def [file] [log] [blame]
Jeff Dike995473a2006-09-27 01:50:40 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Copyright 2003 PathScale, Inc.
4 * Licensed under the GPL
5 */
6
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#include "linux/kernel.h"
8#include "linux/sched.h"
9#include "linux/interrupt.h"
Robert Lovedfe52242005-06-23 00:09:04 -070010#include "linux/string.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include "linux/mm.h"
12#include "linux/slab.h"
13#include "linux/utsname.h"
14#include "linux/fs.h"
15#include "linux/utime.h"
16#include "linux/smp_lock.h"
17#include "linux/module.h"
18#include "linux/init.h"
19#include "linux/capability.h"
20#include "linux/vmalloc.h"
21#include "linux/spinlock.h"
22#include "linux/proc_fs.h"
23#include "linux/ptrace.h"
24#include "linux/random.h"
Jeff Dike8f80e942006-09-25 23:33:01 -070025#include "linux/personality.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include "asm/unistd.h"
27#include "asm/mman.h"
28#include "asm/segment.h"
29#include "asm/stat.h"
30#include "asm/pgtable.h"
31#include "asm/processor.h"
32#include "asm/tlbflush.h"
33#include "asm/uaccess.h"
34#include "asm/user.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include "kern_util.h"
Jeff Dike4ff83ce2007-05-06 14:51:08 -070036#include "as-layout.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include "kern.h"
38#include "signal_kern.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include "init.h"
40#include "irq_user.h"
41#include "mem_user.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include "tlb.h"
43#include "frame_kern.h"
44#include "sigcontext.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include "os.h"
46#include "mode.h"
47#include "mode_kern.h"
48#include "choose-mode.h"
49
50/* This is a per-cpu array. A processor only modifies its entry and it only
51 * cares about its entry, so it's OK if another processor is modifying its
52 * entry.
53 */
54struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } };
55
Jeff Dike6e21aec2007-05-06 14:51:21 -070056static inline int external_pid(struct task_struct *task)
Linus Torvalds1da177e2005-04-16 15:20:36 -070057{
Jeff Dike6e21aec2007-05-06 14:51:21 -070058 return CHOOSE_MODE_PROC(external_pid_tt, external_pid_skas, task);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059}
60
61int pid_to_processor_id(int pid)
62{
63 int i;
64
65 for(i = 0; i < ncpus; i++){
Jeff Dike6e21aec2007-05-06 14:51:21 -070066 if(cpu_tasks[i].pid == pid)
67 return i;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 }
Jeff Dike6e21aec2007-05-06 14:51:21 -070069 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070}
71
72void free_stack(unsigned long stack, int order)
73{
74 free_pages(stack, order);
75}
76
77unsigned long alloc_stack(int order, int atomic)
78{
79 unsigned long page;
Al Viro53f9fc92005-10-21 03:22:24 -040080 gfp_t flags = GFP_KERNEL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
Paolo 'Blaisorblade' Giarrusso46db4a42005-09-22 21:44:20 -070082 if (atomic)
83 flags = GFP_ATOMIC;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 page = __get_free_pages(flags, order);
Jeff Dike5c8aace2007-10-16 01:26:46 -070085 if (page == 0)
Jeff Dike6e21aec2007-05-06 14:51:21 -070086 return 0;
Jeff Dike5c8aace2007-10-16 01:26:46 -070087
Jeff Dike6e21aec2007-05-06 14:51:21 -070088 return page;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089}
90
91int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
92{
93 int pid;
94
95 current->thread.request.u.thread.proc = fn;
96 current->thread.request.u.thread.arg = arg;
Jeff Dikee0877f02005-06-25 14:55:21 -070097 pid = do_fork(CLONE_VM | CLONE_UNTRACED | flags, 0,
98 &current->thread.regs, 0, NULL, NULL);
Jeff Dike6e21aec2007-05-06 14:51:21 -070099 return pid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100}
101
Jeff Dike6e21aec2007-05-06 14:51:21 -0700102static inline void set_current(struct task_struct *task)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103{
Al Viroca9bc0b2006-01-12 01:05:48 -0800104 cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 { external_pid(task), task });
106}
107
108void *_switch_to(void *prev, void *next, void *last)
109{
Jeff Dike995473a2006-09-27 01:50:40 -0700110 struct task_struct *from = prev;
111 struct task_struct *to= next;
Jeff Dikef6e34c62005-09-16 19:27:43 -0700112
Jeff Dike995473a2006-09-27 01:50:40 -0700113 to->thread.prev_sched = from;
114 set_current(to);
Jeff Dikef6e34c62005-09-16 19:27:43 -0700115
Jeff Dike3eddddc2005-09-16 19:27:46 -0700116 do {
117 current->thread.saved_task = NULL ;
118 CHOOSE_MODE_PROC(switch_to_tt, switch_to_skas, prev, next);
119 if(current->thread.saved_task)
120 show_regs(&(current->thread.regs));
121 next= current->thread.saved_task;
122 prev= current;
123 } while(current->thread.saved_task);
Jeff Dikef6e34c62005-09-16 19:27:43 -0700124
Jeff Dike6e21aec2007-05-06 14:51:21 -0700125 return current->thread.prev_sched;
Jeff Dikef6e34c62005-09-16 19:27:43 -0700126
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127}
128
129void interrupt_end(void)
130{
Jeff Dike6e21aec2007-05-06 14:51:21 -0700131 if(need_resched())
132 schedule();
133 if(test_tsk_thread_flag(current, TIF_SIGPENDING))
134 do_signal();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135}
136
137void release_thread(struct task_struct *task)
138{
139 CHOOSE_MODE(release_thread_tt(task), release_thread_skas(task));
140}
Jeff Dike995473a2006-09-27 01:50:40 -0700141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142void exit_thread(void)
143{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144}
Jeff Dike995473a2006-09-27 01:50:40 -0700145
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146void *get_current(void)
147{
Jeff Dike6e21aec2007-05-06 14:51:21 -0700148 return current;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149}
150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
Jeff Dike995473a2006-09-27 01:50:40 -0700152 unsigned long stack_top, struct task_struct * p,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 struct pt_regs *regs)
154{
Paolo 'Blaisorblade' Giarrussoaa6758d2006-03-31 02:30:22 -0800155 int ret;
156
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 p->thread = (struct thread_struct) INIT_THREAD;
Paolo 'Blaisorblade' Giarrussoaa6758d2006-03-31 02:30:22 -0800158 ret = CHOOSE_MODE_PROC(copy_thread_tt, copy_thread_skas, nr,
159 clone_flags, sp, stack_top, p, regs);
160
161 if (ret || !current->thread.forking)
162 goto out;
163
164 clear_flushed_tls(p);
165
166 /*
167 * Set a new TLS for the child thread?
168 */
169 if (clone_flags & CLONE_SETTLS)
170 ret = arch_copy_tls(p);
171
172out:
173 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174}
175
176void initial_thread_cb(void (*proc)(void *), void *arg)
177{
178 int save_kmalloc_ok = kmalloc_ok;
179
180 kmalloc_ok = 0;
Jeff Dike995473a2006-09-27 01:50:40 -0700181 CHOOSE_MODE_PROC(initial_thread_cb_tt, initial_thread_cb_skas, proc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 arg);
183 kmalloc_ok = save_kmalloc_ok;
184}
Jeff Dike995473a2006-09-27 01:50:40 -0700185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186void default_idle(void)
187{
Jeff Dikea6f4e3c2005-06-25 14:55:22 -0700188 CHOOSE_MODE(uml_idle_timer(), (void) 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 while(1){
191 /* endless idle loop with no priority at all */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
193 /*
194 * although we are an idle CPU, we do not want to
195 * get into the scheduler unnecessarily.
196 */
197 if(need_resched())
198 schedule();
Jeff Dike995473a2006-09-27 01:50:40 -0700199
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 idle_sleep(10);
201 }
202}
203
204void cpu_idle(void)
205{
206 CHOOSE_MODE(init_idle_tt(), init_idle_skas());
207}
208
Jeff Dike995473a2006-09-27 01:50:40 -0700209void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 pte_t *pte_out)
211{
212 pgd_t *pgd;
213 pud_t *pud;
214 pmd_t *pmd;
215 pte_t *pte;
Hugh Dickins8f5cd762005-10-29 18:16:38 -0700216 pte_t ptent;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Jeff Dike995473a2006-09-27 01:50:40 -0700218 if(task->mm == NULL)
Jeff Dike6e21aec2007-05-06 14:51:21 -0700219 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 pgd = pgd_offset(task->mm, addr);
221 if(!pgd_present(*pgd))
Jeff Dike6e21aec2007-05-06 14:51:21 -0700222 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224 pud = pud_offset(pgd, addr);
225 if(!pud_present(*pud))
Jeff Dike6e21aec2007-05-06 14:51:21 -0700226 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228 pmd = pmd_offset(pud, addr);
Jeff Dike995473a2006-09-27 01:50:40 -0700229 if(!pmd_present(*pmd))
Jeff Dike6e21aec2007-05-06 14:51:21 -0700230 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232 pte = pte_offset_kernel(pmd, addr);
Hugh Dickins8f5cd762005-10-29 18:16:38 -0700233 ptent = *pte;
234 if(!pte_present(ptent))
Jeff Dike6e21aec2007-05-06 14:51:21 -0700235 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237 if(pte_out != NULL)
Hugh Dickins8f5cd762005-10-29 18:16:38 -0700238 *pte_out = ptent;
Jeff Dike6e21aec2007-05-06 14:51:21 -0700239 return (void *) (pte_val(ptent) & PAGE_MASK) + (addr & ~PAGE_MASK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240}
241
242char *current_cmd(void)
243{
244#if defined(CONFIG_SMP) || defined(CONFIG_HIGHMEM)
Jeff Dike6e21aec2007-05-06 14:51:21 -0700245 return "(Unknown)";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246#else
247 void *addr = um_virt_to_phys(current, current->mm->arg_start, NULL);
248 return IS_ERR(addr) ? "(Unknown)": __va((unsigned long) addr);
249#endif
250}
251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252void dump_thread(struct pt_regs *regs, struct user *u)
253{
254}
255
Paolo 'Blaisorblade' Giarrussob6316292006-01-18 17:42:58 -0800256int __cant_sleep(void) {
257 return in_atomic() || irqs_disabled() || in_interrupt();
258 /* Is in_interrupt() really needed? */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259}
260
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261int user_context(unsigned long sp)
262{
263 unsigned long stack;
264
265 stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
Jeff Dike6e21aec2007-05-06 14:51:21 -0700266 return stack != (unsigned long) current_thread;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267}
268
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end;
270
271void do_uml_exitcalls(void)
272{
273 exitcall_t *call;
274
275 call = &__uml_exitcall_end;
276 while (--call >= &__uml_exitcall_begin)
277 (*call)();
278}
279
280char *uml_strdup(char *string)
281{
Robert Lovedfe52242005-06-23 00:09:04 -0700282 return kstrdup(string, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285int copy_to_user_proc(void __user *to, void *from, int size)
286{
Jeff Dike6e21aec2007-05-06 14:51:21 -0700287 return copy_to_user(to, from, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288}
289
290int copy_from_user_proc(void *to, void __user *from, int size)
291{
Jeff Dike6e21aec2007-05-06 14:51:21 -0700292 return copy_from_user(to, from, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293}
294
295int clear_user_proc(void __user *buf, int size)
296{
Jeff Dike6e21aec2007-05-06 14:51:21 -0700297 return clear_user(buf, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298}
299
300int strlen_user_proc(char __user *str)
301{
Jeff Dike6e21aec2007-05-06 14:51:21 -0700302 return strlen_user(str);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303}
304
305int smp_sigio_handler(void)
306{
307#ifdef CONFIG_SMP
308 int cpu = current_thread->cpu;
309 IPI_handler(cpu);
310 if(cpu != 0)
Jeff Dike6e21aec2007-05-06 14:51:21 -0700311 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312#endif
Jeff Dike6e21aec2007-05-06 14:51:21 -0700313 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314}
315
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316int cpu(void)
317{
Jeff Dike6e21aec2007-05-06 14:51:21 -0700318 return current_thread->cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319}
320
321static atomic_t using_sysemu = ATOMIC_INIT(0);
322int sysemu_supported;
323
324void set_using_sysemu(int value)
325{
326 if (value > sysemu_supported)
327 return;
328 atomic_set(&using_sysemu, value);
329}
330
331int get_using_sysemu(void)
332{
333 return atomic_read(&using_sysemu);
334}
335
336static int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int *eof, void *data)
337{
338 if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size) /*No overflow*/
339 *eof = 1;
340
341 return strlen(buf);
342}
343
Al Viro4d338e12006-03-31 02:30:15 -0800344static int proc_write_sysemu(struct file *file,const char __user *buf, unsigned long count,void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345{
346 char tmp[2];
347
348 if (copy_from_user(tmp, buf, 1))
349 return -EFAULT;
350
351 if (tmp[0] >= '0' && tmp[0] <= '2')
352 set_using_sysemu(tmp[0] - '0');
353 return count; /*We use the first char, but pretend to write everything*/
354}
355
356int __init make_proc_sysemu(void)
357{
358 struct proc_dir_entry *ent;
359 if (!sysemu_supported)
360 return 0;
361
362 ent = create_proc_entry("sysemu", 0600, &proc_root);
363
364 if (ent == NULL)
365 {
Christophe Lucas30f417c2005-07-28 21:16:12 -0700366 printk(KERN_WARNING "Failed to register /proc/sysemu\n");
Jeff Dike6e21aec2007-05-06 14:51:21 -0700367 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 }
369
370 ent->read_proc = proc_read_sysemu;
371 ent->write_proc = proc_write_sysemu;
372
373 return 0;
374}
375
376late_initcall(make_proc_sysemu);
377
378int singlestepping(void * t)
379{
380 struct task_struct *task = t ? t : current;
381
382 if ( ! (task->ptrace & PT_DTRACE) )
383 return(0);
384
385 if (task->thread.singlestep_syscall)
386 return(1);
387
388 return 2;
389}
390
Bodo Stroesserb8bd0222005-05-06 21:30:53 -0700391/*
392 * Only x86 and x86_64 have an arch_align_stack().
393 * All other arches have "#define arch_align_stack(x) (x)"
394 * in their asm/system.h
395 * As this is included in UML from asm-um/system-generic.h,
396 * we can use it to behave as the subarch does.
397 */
398#ifndef arch_align_stack
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399unsigned long arch_align_stack(unsigned long sp)
400{
Jeff Dike8f80e942006-09-25 23:33:01 -0700401 if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 sp -= get_random_int() % 8192;
403 return sp & ~0xf;
404}
Bodo Stroesserb8bd0222005-05-06 21:30:53 -0700405#endif