Jeff Dike | 995473a | 2006-09-27 01:50:40 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) |
| 3 | * Copyright 2003 PathScale, Inc. |
| 4 | * Licensed under the GPL |
| 5 | */ |
| 6 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | #include "linux/kernel.h" |
| 8 | #include "linux/sched.h" |
| 9 | #include "linux/interrupt.h" |
Robert Love | dfe5224 | 2005-06-23 00:09:04 -0700 | [diff] [blame] | 10 | #include "linux/string.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #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 Dike | 8f80e94 | 2006-09-25 23:33:01 -0700 | [diff] [blame] | 25 | #include "linux/personality.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include "kern_util.h" |
Jeff Dike | 4ff83ce | 2007-05-06 14:51:08 -0700 | [diff] [blame] | 36 | #include "as-layout.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include "kern.h" |
| 38 | #include "signal_kern.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include "init.h" |
| 40 | #include "irq_user.h" |
| 41 | #include "mem_user.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include "tlb.h" |
| 43 | #include "frame_kern.h" |
| 44 | #include "sigcontext.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include "os.h" |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame^] | 46 | #include "skas.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | /* This is a per-cpu array. A processor only modifies its entry and it only |
| 49 | * cares about its entry, so it's OK if another processor is modifying its |
| 50 | * entry. |
| 51 | */ |
| 52 | struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } }; |
| 53 | |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 54 | static inline int external_pid(struct task_struct *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | { |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame^] | 56 | /* FIXME: Need to look up userspace_pid by cpu */ |
| 57 | return(userspace_pid[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | } |
| 59 | |
| 60 | int pid_to_processor_id(int pid) |
| 61 | { |
| 62 | int i; |
| 63 | |
| 64 | for(i = 0; i < ncpus; i++){ |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 65 | if(cpu_tasks[i].pid == pid) |
| 66 | return i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | } |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 68 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | } |
| 70 | |
| 71 | void free_stack(unsigned long stack, int order) |
| 72 | { |
| 73 | free_pages(stack, order); |
| 74 | } |
| 75 | |
| 76 | unsigned long alloc_stack(int order, int atomic) |
| 77 | { |
| 78 | unsigned long page; |
Al Viro | 53f9fc9 | 2005-10-21 03:22:24 -0400 | [diff] [blame] | 79 | gfp_t flags = GFP_KERNEL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
Paolo 'Blaisorblade' Giarrusso | 46db4a4 | 2005-09-22 21:44:20 -0700 | [diff] [blame] | 81 | if (atomic) |
| 82 | flags = GFP_ATOMIC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | page = __get_free_pages(flags, order); |
Jeff Dike | 5c8aace | 2007-10-16 01:26:46 -0700 | [diff] [blame] | 84 | if (page == 0) |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 85 | return 0; |
Jeff Dike | 5c8aace | 2007-10-16 01:26:46 -0700 | [diff] [blame] | 86 | |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 87 | return page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) |
| 91 | { |
| 92 | int pid; |
| 93 | |
| 94 | current->thread.request.u.thread.proc = fn; |
| 95 | current->thread.request.u.thread.arg = arg; |
Jeff Dike | e0877f0 | 2005-06-25 14:55:21 -0700 | [diff] [blame] | 96 | pid = do_fork(CLONE_VM | CLONE_UNTRACED | flags, 0, |
| 97 | ¤t->thread.regs, 0, NULL, NULL); |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 98 | return pid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | } |
| 100 | |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 101 | static inline void set_current(struct task_struct *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | { |
Al Viro | ca9bc0b | 2006-01-12 01:05:48 -0800 | [diff] [blame] | 103 | cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | { external_pid(task), task }); |
| 105 | } |
| 106 | |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame^] | 107 | extern void arch_switch_to(struct task_struct *from, struct task_struct *to); |
| 108 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | void *_switch_to(void *prev, void *next, void *last) |
| 110 | { |
Jeff Dike | 995473a | 2006-09-27 01:50:40 -0700 | [diff] [blame] | 111 | struct task_struct *from = prev; |
| 112 | struct task_struct *to= next; |
Jeff Dike | f6e34c6 | 2005-09-16 19:27:43 -0700 | [diff] [blame] | 113 | |
Jeff Dike | 995473a | 2006-09-27 01:50:40 -0700 | [diff] [blame] | 114 | to->thread.prev_sched = from; |
| 115 | set_current(to); |
Jeff Dike | f6e34c6 | 2005-09-16 19:27:43 -0700 | [diff] [blame] | 116 | |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 117 | do { |
Jeff Dike | 6aa802c | 2007-10-16 01:26:56 -0700 | [diff] [blame] | 118 | current->thread.saved_task = NULL; |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame^] | 119 | |
| 120 | /* XXX need to check runqueues[cpu].idle */ |
| 121 | if(current->pid == 0) |
| 122 | switch_timers(0); |
| 123 | |
| 124 | switch_threads(&from->thread.switch_buf, |
| 125 | &to->thread.switch_buf); |
| 126 | |
| 127 | arch_switch_to(current->thread.prev_sched, current); |
| 128 | |
| 129 | if(current->pid == 0) |
| 130 | switch_timers(1); |
| 131 | |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 132 | if(current->thread.saved_task) |
| 133 | show_regs(&(current->thread.regs)); |
| 134 | next= current->thread.saved_task; |
| 135 | prev= current; |
| 136 | } while(current->thread.saved_task); |
Jeff Dike | f6e34c6 | 2005-09-16 19:27:43 -0700 | [diff] [blame] | 137 | |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 138 | return current->thread.prev_sched; |
Jeff Dike | f6e34c6 | 2005-09-16 19:27:43 -0700 | [diff] [blame] | 139 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | } |
| 141 | |
| 142 | void interrupt_end(void) |
| 143 | { |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 144 | if(need_resched()) |
| 145 | schedule(); |
| 146 | if(test_tsk_thread_flag(current, TIF_SIGPENDING)) |
| 147 | do_signal(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } |
| 149 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | void exit_thread(void) |
| 151 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | } |
Jeff Dike | 995473a | 2006-09-27 01:50:40 -0700 | [diff] [blame] | 153 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | void *get_current(void) |
| 155 | { |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 156 | return current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | } |
| 158 | |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame^] | 159 | extern void schedule_tail(struct task_struct *prev); |
| 160 | |
| 161 | /* This is called magically, by its address being stuffed in a jmp_buf |
| 162 | * and being longjmp-d to. |
| 163 | */ |
| 164 | void new_thread_handler(void) |
| 165 | { |
| 166 | int (*fn)(void *), n; |
| 167 | void *arg; |
| 168 | |
| 169 | if(current->thread.prev_sched != NULL) |
| 170 | schedule_tail(current->thread.prev_sched); |
| 171 | current->thread.prev_sched = NULL; |
| 172 | |
| 173 | fn = current->thread.request.u.thread.proc; |
| 174 | arg = current->thread.request.u.thread.arg; |
| 175 | |
| 176 | /* The return value is 1 if the kernel thread execs a process, |
| 177 | * 0 if it just exits |
| 178 | */ |
| 179 | n = run_kernel_thread(fn, arg, ¤t->thread.exec_buf); |
| 180 | if(n == 1){ |
| 181 | /* Handle any immediate reschedules or signals */ |
| 182 | interrupt_end(); |
| 183 | userspace(¤t->thread.regs.regs); |
| 184 | } |
| 185 | else do_exit(0); |
| 186 | } |
| 187 | |
| 188 | /* Called magically, see new_thread_handler above */ |
| 189 | void fork_handler(void) |
| 190 | { |
| 191 | force_flush_all(); |
| 192 | if(current->thread.prev_sched == NULL) |
| 193 | panic("blech"); |
| 194 | |
| 195 | schedule_tail(current->thread.prev_sched); |
| 196 | |
| 197 | /* XXX: if interrupt_end() calls schedule, this call to |
| 198 | * arch_switch_to isn't needed. We could want to apply this to |
| 199 | * improve performance. -bb */ |
| 200 | arch_switch_to(current->thread.prev_sched, current); |
| 201 | |
| 202 | current->thread.prev_sched = NULL; |
| 203 | |
| 204 | /* Handle any immediate reschedules or signals */ |
| 205 | interrupt_end(); |
| 206 | |
| 207 | userspace(¤t->thread.regs.regs); |
| 208 | } |
| 209 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, |
Jeff Dike | 995473a | 2006-09-27 01:50:40 -0700 | [diff] [blame] | 211 | unsigned long stack_top, struct task_struct * p, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | struct pt_regs *regs) |
| 213 | { |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame^] | 214 | void (*handler)(void); |
| 215 | int ret = 0; |
Paolo 'Blaisorblade' Giarrusso | aa6758d | 2006-03-31 02:30:22 -0800 | [diff] [blame] | 216 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | p->thread = (struct thread_struct) INIT_THREAD; |
Paolo 'Blaisorblade' Giarrusso | aa6758d | 2006-03-31 02:30:22 -0800 | [diff] [blame] | 218 | |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame^] | 219 | if(current->thread.forking){ |
| 220 | memcpy(&p->thread.regs.regs, ®s->regs, |
| 221 | sizeof(p->thread.regs.regs)); |
| 222 | REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.regs, 0); |
| 223 | if(sp != 0) |
| 224 | REGS_SP(p->thread.regs.regs.regs) = sp; |
Paolo 'Blaisorblade' Giarrusso | aa6758d | 2006-03-31 02:30:22 -0800 | [diff] [blame] | 225 | |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame^] | 226 | handler = fork_handler; |
Paolo 'Blaisorblade' Giarrusso | aa6758d | 2006-03-31 02:30:22 -0800 | [diff] [blame] | 227 | |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame^] | 228 | arch_copy_thread(¤t->thread.arch, &p->thread.arch); |
| 229 | } |
| 230 | else { |
| 231 | init_thread_registers(&p->thread.regs.regs); |
| 232 | p->thread.request.u.thread = current->thread.request.u.thread; |
| 233 | handler = new_thread_handler; |
| 234 | } |
Paolo 'Blaisorblade' Giarrusso | aa6758d | 2006-03-31 02:30:22 -0800 | [diff] [blame] | 235 | |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame^] | 236 | new_thread(task_stack_page(p), &p->thread.switch_buf, handler); |
| 237 | |
| 238 | if (current->thread.forking) { |
| 239 | clear_flushed_tls(p); |
| 240 | |
| 241 | /* |
| 242 | * Set a new TLS for the child thread? |
| 243 | */ |
| 244 | if (clone_flags & CLONE_SETTLS) |
| 245 | ret = arch_copy_tls(p); |
| 246 | } |
| 247 | |
Paolo 'Blaisorblade' Giarrusso | aa6758d | 2006-03-31 02:30:22 -0800 | [diff] [blame] | 248 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | } |
| 250 | |
| 251 | void initial_thread_cb(void (*proc)(void *), void *arg) |
| 252 | { |
| 253 | int save_kmalloc_ok = kmalloc_ok; |
| 254 | |
| 255 | kmalloc_ok = 0; |
Jeff Dike | 6aa802c | 2007-10-16 01:26:56 -0700 | [diff] [blame] | 256 | initial_thread_cb_skas(proc, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | kmalloc_ok = save_kmalloc_ok; |
| 258 | } |
Jeff Dike | 995473a | 2006-09-27 01:50:40 -0700 | [diff] [blame] | 259 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | void default_idle(void) |
| 261 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | while(1){ |
| 263 | /* endless idle loop with no priority at all */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | |
| 265 | /* |
| 266 | * although we are an idle CPU, we do not want to |
| 267 | * get into the scheduler unnecessarily. |
| 268 | */ |
| 269 | if(need_resched()) |
| 270 | schedule(); |
Jeff Dike | 995473a | 2006-09-27 01:50:40 -0700 | [diff] [blame] | 271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | idle_sleep(10); |
| 273 | } |
| 274 | } |
| 275 | |
| 276 | void cpu_idle(void) |
| 277 | { |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame^] | 278 | cpu_tasks[current_thread->cpu].pid = os_getpid(); |
| 279 | default_idle(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | } |
| 281 | |
Jeff Dike | 995473a | 2006-09-27 01:50:40 -0700 | [diff] [blame] | 282 | void *um_virt_to_phys(struct task_struct *task, unsigned long addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | pte_t *pte_out) |
| 284 | { |
| 285 | pgd_t *pgd; |
| 286 | pud_t *pud; |
| 287 | pmd_t *pmd; |
| 288 | pte_t *pte; |
Hugh Dickins | 8f5cd76 | 2005-10-29 18:16:38 -0700 | [diff] [blame] | 289 | pte_t ptent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
Jeff Dike | 995473a | 2006-09-27 01:50:40 -0700 | [diff] [blame] | 291 | if(task->mm == NULL) |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 292 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | pgd = pgd_offset(task->mm, addr); |
| 294 | if(!pgd_present(*pgd)) |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 295 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | |
| 297 | pud = pud_offset(pgd, addr); |
| 298 | if(!pud_present(*pud)) |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 299 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | |
| 301 | pmd = pmd_offset(pud, addr); |
Jeff Dike | 995473a | 2006-09-27 01:50:40 -0700 | [diff] [blame] | 302 | if(!pmd_present(*pmd)) |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 303 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
| 305 | pte = pte_offset_kernel(pmd, addr); |
Hugh Dickins | 8f5cd76 | 2005-10-29 18:16:38 -0700 | [diff] [blame] | 306 | ptent = *pte; |
| 307 | if(!pte_present(ptent)) |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 308 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | |
| 310 | if(pte_out != NULL) |
Hugh Dickins | 8f5cd76 | 2005-10-29 18:16:38 -0700 | [diff] [blame] | 311 | *pte_out = ptent; |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 312 | return (void *) (pte_val(ptent) & PAGE_MASK) + (addr & ~PAGE_MASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | } |
| 314 | |
| 315 | char *current_cmd(void) |
| 316 | { |
| 317 | #if defined(CONFIG_SMP) || defined(CONFIG_HIGHMEM) |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 318 | return "(Unknown)"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | #else |
| 320 | void *addr = um_virt_to_phys(current, current->mm->arg_start, NULL); |
| 321 | return IS_ERR(addr) ? "(Unknown)": __va((unsigned long) addr); |
| 322 | #endif |
| 323 | } |
| 324 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | void dump_thread(struct pt_regs *regs, struct user *u) |
| 326 | { |
| 327 | } |
| 328 | |
Paolo 'Blaisorblade' Giarrusso | b631629 | 2006-01-18 17:42:58 -0800 | [diff] [blame] | 329 | int __cant_sleep(void) { |
| 330 | return in_atomic() || irqs_disabled() || in_interrupt(); |
| 331 | /* Is in_interrupt() really needed? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | } |
| 333 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | int user_context(unsigned long sp) |
| 335 | { |
| 336 | unsigned long stack; |
| 337 | |
| 338 | stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER); |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 339 | return stack != (unsigned long) current_thread; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | } |
| 341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end; |
| 343 | |
| 344 | void do_uml_exitcalls(void) |
| 345 | { |
| 346 | exitcall_t *call; |
| 347 | |
| 348 | call = &__uml_exitcall_end; |
| 349 | while (--call >= &__uml_exitcall_begin) |
| 350 | (*call)(); |
| 351 | } |
| 352 | |
| 353 | char *uml_strdup(char *string) |
| 354 | { |
Robert Love | dfe5224 | 2005-06-23 00:09:04 -0700 | [diff] [blame] | 355 | return kstrdup(string, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | } |
| 357 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | int copy_to_user_proc(void __user *to, void *from, int size) |
| 359 | { |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 360 | return copy_to_user(to, from, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | } |
| 362 | |
| 363 | int copy_from_user_proc(void *to, void __user *from, int size) |
| 364 | { |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 365 | return copy_from_user(to, from, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | } |
| 367 | |
| 368 | int clear_user_proc(void __user *buf, int size) |
| 369 | { |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 370 | return clear_user(buf, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | } |
| 372 | |
| 373 | int strlen_user_proc(char __user *str) |
| 374 | { |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 375 | return strlen_user(str); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | } |
| 377 | |
| 378 | int smp_sigio_handler(void) |
| 379 | { |
| 380 | #ifdef CONFIG_SMP |
| 381 | int cpu = current_thread->cpu; |
| 382 | IPI_handler(cpu); |
| 383 | if(cpu != 0) |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 384 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | #endif |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 386 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | } |
| 388 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | int cpu(void) |
| 390 | { |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 391 | return current_thread->cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | } |
| 393 | |
| 394 | static atomic_t using_sysemu = ATOMIC_INIT(0); |
| 395 | int sysemu_supported; |
| 396 | |
| 397 | void set_using_sysemu(int value) |
| 398 | { |
| 399 | if (value > sysemu_supported) |
| 400 | return; |
| 401 | atomic_set(&using_sysemu, value); |
| 402 | } |
| 403 | |
| 404 | int get_using_sysemu(void) |
| 405 | { |
| 406 | return atomic_read(&using_sysemu); |
| 407 | } |
| 408 | |
| 409 | static int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int *eof, void *data) |
| 410 | { |
| 411 | if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size) /*No overflow*/ |
| 412 | *eof = 1; |
| 413 | |
| 414 | return strlen(buf); |
| 415 | } |
| 416 | |
Al Viro | 4d338e1 | 2006-03-31 02:30:15 -0800 | [diff] [blame] | 417 | static int proc_write_sysemu(struct file *file,const char __user *buf, unsigned long count,void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | { |
| 419 | char tmp[2]; |
| 420 | |
| 421 | if (copy_from_user(tmp, buf, 1)) |
| 422 | return -EFAULT; |
| 423 | |
| 424 | if (tmp[0] >= '0' && tmp[0] <= '2') |
| 425 | set_using_sysemu(tmp[0] - '0'); |
| 426 | return count; /*We use the first char, but pretend to write everything*/ |
| 427 | } |
| 428 | |
| 429 | int __init make_proc_sysemu(void) |
| 430 | { |
| 431 | struct proc_dir_entry *ent; |
| 432 | if (!sysemu_supported) |
| 433 | return 0; |
| 434 | |
| 435 | ent = create_proc_entry("sysemu", 0600, &proc_root); |
| 436 | |
| 437 | if (ent == NULL) |
| 438 | { |
Christophe Lucas | 30f417c | 2005-07-28 21:16:12 -0700 | [diff] [blame] | 439 | printk(KERN_WARNING "Failed to register /proc/sysemu\n"); |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 440 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | } |
| 442 | |
| 443 | ent->read_proc = proc_read_sysemu; |
| 444 | ent->write_proc = proc_write_sysemu; |
| 445 | |
| 446 | return 0; |
| 447 | } |
| 448 | |
| 449 | late_initcall(make_proc_sysemu); |
| 450 | |
| 451 | int singlestepping(void * t) |
| 452 | { |
| 453 | struct task_struct *task = t ? t : current; |
| 454 | |
| 455 | if ( ! (task->ptrace & PT_DTRACE) ) |
| 456 | return(0); |
| 457 | |
| 458 | if (task->thread.singlestep_syscall) |
| 459 | return(1); |
| 460 | |
| 461 | return 2; |
| 462 | } |
| 463 | |
Bodo Stroesser | b8bd022 | 2005-05-06 21:30:53 -0700 | [diff] [blame] | 464 | /* |
| 465 | * Only x86 and x86_64 have an arch_align_stack(). |
| 466 | * All other arches have "#define arch_align_stack(x) (x)" |
| 467 | * in their asm/system.h |
| 468 | * As this is included in UML from asm-um/system-generic.h, |
| 469 | * we can use it to behave as the subarch does. |
| 470 | */ |
| 471 | #ifndef arch_align_stack |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | unsigned long arch_align_stack(unsigned long sp) |
| 473 | { |
Jeff Dike | 8f80e94 | 2006-09-25 23:33:01 -0700 | [diff] [blame] | 474 | if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | sp -= get_random_int() % 8192; |
| 476 | return sp & ~0xf; |
| 477 | } |
Bodo Stroesser | b8bd022 | 2005-05-06 21:30:53 -0700 | [diff] [blame] | 478 | #endif |