Jeff Dike | 995473a | 2006-09-27 01:50:40 -0700 | [diff] [blame] | 1 | /* |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 2 | * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * Copyright 2003 PathScale, Inc. |
| 4 | * Licensed under the GPL |
| 5 | */ |
| 6 | |
Jeff Dike | c5d4bb1 | 2008-02-04 22:31:14 -0800 | [diff] [blame] | 7 | #include <linux/stddef.h> |
| 8 | #include <linux/err.h> |
| 9 | #include <linux/hardirq.h> |
| 10 | #include <linux/gfp.h> |
| 11 | #include <linux/mm.h> |
| 12 | #include <linux/personality.h> |
| 13 | #include <linux/proc_fs.h> |
| 14 | #include <linux/ptrace.h> |
| 15 | #include <linux/random.h> |
| 16 | #include <linux/sched.h> |
| 17 | #include <linux/tick.h> |
| 18 | #include <linux/threads.h> |
| 19 | #include <asm/current.h> |
| 20 | #include <asm/pgtable.h> |
| 21 | #include <asm/uaccess.h> |
Jeff Dike | 4ff83ce | 2007-05-06 14:51:08 -0700 | [diff] [blame] | 22 | #include "as-layout.h" |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 23 | #include "kern_util.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include "os.h" |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 25 | #include "skas.h" |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 26 | #include "tlb.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 28 | /* |
| 29 | * This is a per-cpu array. A processor only modifies its entry and it only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | * cares about its entry, so it's OK if another processor is modifying its |
| 31 | * entry. |
| 32 | */ |
| 33 | struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } }; |
| 34 | |
Karol Swietlicki | 2dc5802 | 2008-02-04 22:31:03 -0800 | [diff] [blame] | 35 | static inline int external_pid(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | { |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 37 | /* FIXME: Need to look up userspace_pid by cpu */ |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 38 | return userspace_pid[0]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | } |
| 40 | |
| 41 | int pid_to_processor_id(int pid) |
| 42 | { |
| 43 | int i; |
| 44 | |
Jeff Dike | c5d4bb1 | 2008-02-04 22:31:14 -0800 | [diff] [blame] | 45 | for (i = 0; i < ncpus; i++) { |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 46 | if (cpu_tasks[i].pid == pid) |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 47 | return i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | } |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 49 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | void free_stack(unsigned long stack, int order) |
| 53 | { |
| 54 | free_pages(stack, order); |
| 55 | } |
| 56 | |
| 57 | unsigned long alloc_stack(int order, int atomic) |
| 58 | { |
| 59 | unsigned long page; |
Al Viro | 53f9fc9 | 2005-10-21 03:22:24 -0400 | [diff] [blame] | 60 | gfp_t flags = GFP_KERNEL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
Paolo 'Blaisorblade' Giarrusso | 46db4a4 | 2005-09-22 21:44:20 -0700 | [diff] [blame] | 62 | if (atomic) |
| 63 | flags = GFP_ATOMIC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | page = __get_free_pages(flags, order); |
Jeff Dike | 5c8aace | 2007-10-16 01:26:46 -0700 | [diff] [blame] | 65 | |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 66 | return page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | } |
| 68 | |
| 69 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) |
| 70 | { |
| 71 | int pid; |
| 72 | |
| 73 | current->thread.request.u.thread.proc = fn; |
| 74 | current->thread.request.u.thread.arg = arg; |
Jeff Dike | e0877f0 | 2005-06-25 14:55:21 -0700 | [diff] [blame] | 75 | pid = do_fork(CLONE_VM | CLONE_UNTRACED | flags, 0, |
| 76 | ¤t->thread.regs, 0, NULL, NULL); |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 77 | return pid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | } |
| 79 | |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 80 | static inline void set_current(struct task_struct *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | { |
Al Viro | ca9bc0b | 2006-01-12 01:05:48 -0800 | [diff] [blame] | 82 | cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task) |
Karol Swietlicki | 2dc5802 | 2008-02-04 22:31:03 -0800 | [diff] [blame] | 83 | { external_pid(), task }); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | } |
| 85 | |
Karol Swietlicki | 291248f | 2008-02-04 22:30:49 -0800 | [diff] [blame] | 86 | extern void arch_switch_to(struct task_struct *to); |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | void *_switch_to(void *prev, void *next, void *last) |
| 89 | { |
Jeff Dike | 995473a | 2006-09-27 01:50:40 -0700 | [diff] [blame] | 90 | struct task_struct *from = prev; |
Karol Swietlicki | 291248f | 2008-02-04 22:30:49 -0800 | [diff] [blame] | 91 | struct task_struct *to = next; |
Jeff Dike | f6e34c6 | 2005-09-16 19:27:43 -0700 | [diff] [blame] | 92 | |
Jeff Dike | 995473a | 2006-09-27 01:50:40 -0700 | [diff] [blame] | 93 | to->thread.prev_sched = from; |
| 94 | set_current(to); |
Jeff Dike | f6e34c6 | 2005-09-16 19:27:43 -0700 | [diff] [blame] | 95 | |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 96 | do { |
Jeff Dike | 6aa802c | 2007-10-16 01:26:56 -0700 | [diff] [blame] | 97 | current->thread.saved_task = NULL; |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 98 | |
Jeff Dike | c5d4bb1 | 2008-02-04 22:31:14 -0800 | [diff] [blame] | 99 | switch_threads(&from->thread.switch_buf, |
| 100 | &to->thread.switch_buf); |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 101 | |
Karol Swietlicki | 291248f | 2008-02-04 22:30:49 -0800 | [diff] [blame] | 102 | arch_switch_to(current); |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 103 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 104 | if (current->thread.saved_task) |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 105 | show_regs(&(current->thread.regs)); |
Jeff Dike | c5d4bb1 | 2008-02-04 22:31:14 -0800 | [diff] [blame] | 106 | to = current->thread.saved_task; |
| 107 | from = current; |
Karol Swietlicki | 291248f | 2008-02-04 22:30:49 -0800 | [diff] [blame] | 108 | } while (current->thread.saved_task); |
Jeff Dike | f6e34c6 | 2005-09-16 19:27:43 -0700 | [diff] [blame] | 109 | |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 110 | return current->thread.prev_sched; |
Jeff Dike | f6e34c6 | 2005-09-16 19:27:43 -0700 | [diff] [blame] | 111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | } |
| 113 | |
| 114 | void interrupt_end(void) |
| 115 | { |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 116 | if (need_resched()) |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 117 | schedule(); |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 118 | if (test_tsk_thread_flag(current, TIF_SIGPENDING)) |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 119 | do_signal(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | } |
| 121 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | void exit_thread(void) |
| 123 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | } |
Jeff Dike | 995473a | 2006-09-27 01:50:40 -0700 | [diff] [blame] | 125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | void *get_current(void) |
| 127 | { |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 128 | return current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | } |
| 130 | |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 131 | extern void schedule_tail(struct task_struct *prev); |
| 132 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 133 | /* |
| 134 | * This is called magically, by its address being stuffed in a jmp_buf |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 135 | * and being longjmp-d to. |
| 136 | */ |
| 137 | void new_thread_handler(void) |
| 138 | { |
| 139 | int (*fn)(void *), n; |
| 140 | void *arg; |
| 141 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 142 | if (current->thread.prev_sched != NULL) |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 143 | schedule_tail(current->thread.prev_sched); |
| 144 | current->thread.prev_sched = NULL; |
| 145 | |
| 146 | fn = current->thread.request.u.thread.proc; |
| 147 | arg = current->thread.request.u.thread.arg; |
| 148 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 149 | /* |
| 150 | * The return value is 1 if the kernel thread execs a process, |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 151 | * 0 if it just exits |
| 152 | */ |
| 153 | n = run_kernel_thread(fn, arg, ¤t->thread.exec_buf); |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 154 | if (n == 1) { |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 155 | /* Handle any immediate reschedules or signals */ |
| 156 | interrupt_end(); |
| 157 | userspace(¤t->thread.regs.regs); |
| 158 | } |
| 159 | else do_exit(0); |
| 160 | } |
| 161 | |
| 162 | /* Called magically, see new_thread_handler above */ |
| 163 | void fork_handler(void) |
| 164 | { |
| 165 | force_flush_all(); |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 166 | |
| 167 | schedule_tail(current->thread.prev_sched); |
| 168 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 169 | /* |
| 170 | * XXX: if interrupt_end() calls schedule, this call to |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 171 | * arch_switch_to isn't needed. We could want to apply this to |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 172 | * improve performance. -bb |
| 173 | */ |
Karol Swietlicki | 291248f | 2008-02-04 22:30:49 -0800 | [diff] [blame] | 174 | arch_switch_to(current); |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 175 | |
| 176 | current->thread.prev_sched = NULL; |
| 177 | |
| 178 | /* Handle any immediate reschedules or signals */ |
| 179 | interrupt_end(); |
| 180 | |
| 181 | userspace(¤t->thread.regs.regs); |
| 182 | } |
| 183 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, |
Jeff Dike | 995473a | 2006-09-27 01:50:40 -0700 | [diff] [blame] | 185 | unsigned long stack_top, struct task_struct * p, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | struct pt_regs *regs) |
| 187 | { |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 188 | void (*handler)(void); |
| 189 | int ret = 0; |
Paolo 'Blaisorblade' Giarrusso | aa6758d | 2006-03-31 02:30:22 -0800 | [diff] [blame] | 190 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | p->thread = (struct thread_struct) INIT_THREAD; |
Paolo 'Blaisorblade' Giarrusso | aa6758d | 2006-03-31 02:30:22 -0800 | [diff] [blame] | 192 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 193 | if (current->thread.forking) { |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 194 | memcpy(&p->thread.regs.regs, ®s->regs, |
| 195 | sizeof(p->thread.regs.regs)); |
Jeff Dike | 18baddd | 2007-10-16 01:27:07 -0700 | [diff] [blame] | 196 | REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.gp, 0); |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 197 | if (sp != 0) |
Jeff Dike | 18baddd | 2007-10-16 01:27:07 -0700 | [diff] [blame] | 198 | REGS_SP(p->thread.regs.regs.gp) = sp; |
Paolo 'Blaisorblade' Giarrusso | aa6758d | 2006-03-31 02:30:22 -0800 | [diff] [blame] | 199 | |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 200 | handler = fork_handler; |
Paolo 'Blaisorblade' Giarrusso | aa6758d | 2006-03-31 02:30:22 -0800 | [diff] [blame] | 201 | |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 202 | arch_copy_thread(¤t->thread.arch, &p->thread.arch); |
| 203 | } |
| 204 | else { |
Jeff Dike | d25f2e1 | 2008-02-04 22:30:57 -0800 | [diff] [blame] | 205 | get_safe_registers(p->thread.regs.regs.gp); |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 206 | p->thread.request.u.thread = current->thread.request.u.thread; |
| 207 | handler = new_thread_handler; |
| 208 | } |
Paolo 'Blaisorblade' Giarrusso | aa6758d | 2006-03-31 02:30:22 -0800 | [diff] [blame] | 209 | |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 210 | new_thread(task_stack_page(p), &p->thread.switch_buf, handler); |
| 211 | |
| 212 | if (current->thread.forking) { |
| 213 | clear_flushed_tls(p); |
| 214 | |
| 215 | /* |
| 216 | * Set a new TLS for the child thread? |
| 217 | */ |
| 218 | if (clone_flags & CLONE_SETTLS) |
| 219 | ret = arch_copy_tls(p); |
| 220 | } |
| 221 | |
Paolo 'Blaisorblade' Giarrusso | aa6758d | 2006-03-31 02:30:22 -0800 | [diff] [blame] | 222 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | } |
| 224 | |
| 225 | void initial_thread_cb(void (*proc)(void *), void *arg) |
| 226 | { |
| 227 | int save_kmalloc_ok = kmalloc_ok; |
| 228 | |
| 229 | kmalloc_ok = 0; |
Jeff Dike | 6aa802c | 2007-10-16 01:26:56 -0700 | [diff] [blame] | 230 | initial_thread_cb_skas(proc, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | kmalloc_ok = save_kmalloc_ok; |
| 232 | } |
Jeff Dike | 995473a | 2006-09-27 01:50:40 -0700 | [diff] [blame] | 233 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | void default_idle(void) |
| 235 | { |
Jeff Dike | b160fb6 | 2007-10-16 01:27:26 -0700 | [diff] [blame] | 236 | unsigned long long nsecs; |
| 237 | |
Jeff Dike | c5d4bb1 | 2008-02-04 22:31:14 -0800 | [diff] [blame] | 238 | while (1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | /* endless idle loop with no priority at all */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | |
| 241 | /* |
| 242 | * although we are an idle CPU, we do not want to |
| 243 | * get into the scheduler unnecessarily. |
| 244 | */ |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 245 | if (need_resched()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | schedule(); |
Jeff Dike | 995473a | 2006-09-27 01:50:40 -0700 | [diff] [blame] | 247 | |
Jeff Dike | d2753a6d | 2007-10-16 01:27:25 -0700 | [diff] [blame] | 248 | tick_nohz_stop_sched_tick(); |
Jeff Dike | b160fb6 | 2007-10-16 01:27:26 -0700 | [diff] [blame] | 249 | nsecs = disable_timer(); |
| 250 | idle_sleep(nsecs); |
Jeff Dike | d2753a6d | 2007-10-16 01:27:25 -0700 | [diff] [blame] | 251 | tick_nohz_restart_sched_tick(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | } |
| 253 | } |
| 254 | |
| 255 | void cpu_idle(void) |
| 256 | { |
Jeff Dike | a5a678c | 2008-02-04 22:30:54 -0800 | [diff] [blame] | 257 | cpu_tasks[current_thread_info()->cpu].pid = os_getpid(); |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 258 | default_idle(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | } |
| 260 | |
Paolo 'Blaisorblade' Giarrusso | b631629 | 2006-01-18 17:42:58 -0800 | [diff] [blame] | 261 | int __cant_sleep(void) { |
| 262 | return in_atomic() || irqs_disabled() || in_interrupt(); |
| 263 | /* Is in_interrupt() really needed? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | } |
| 265 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | int user_context(unsigned long sp) |
| 267 | { |
| 268 | unsigned long stack; |
| 269 | |
| 270 | stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER); |
Jeff Dike | a5a678c | 2008-02-04 22:30:54 -0800 | [diff] [blame] | 271 | return stack != (unsigned long) current_thread_info(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | } |
| 273 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end; |
| 275 | |
| 276 | void do_uml_exitcalls(void) |
| 277 | { |
| 278 | exitcall_t *call; |
| 279 | |
| 280 | call = &__uml_exitcall_end; |
| 281 | while (--call >= &__uml_exitcall_begin) |
| 282 | (*call)(); |
| 283 | } |
| 284 | |
WANG Cong | c0a9290 | 2008-02-04 22:30:41 -0800 | [diff] [blame] | 285 | char *uml_strdup(const char *string) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | { |
Robert Love | dfe5224 | 2005-06-23 00:09:04 -0700 | [diff] [blame] | 287 | return kstrdup(string, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | } |
| 289 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | int copy_to_user_proc(void __user *to, void *from, int size) |
| 291 | { |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 292 | return copy_to_user(to, from, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | int copy_from_user_proc(void *to, void __user *from, int size) |
| 296 | { |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 297 | return copy_from_user(to, from, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | } |
| 299 | |
| 300 | int clear_user_proc(void __user *buf, int size) |
| 301 | { |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 302 | return clear_user(buf, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | } |
| 304 | |
| 305 | int strlen_user_proc(char __user *str) |
| 306 | { |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 307 | return strlen_user(str); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | } |
| 309 | |
| 310 | int smp_sigio_handler(void) |
| 311 | { |
| 312 | #ifdef CONFIG_SMP |
Jeff Dike | a5a678c | 2008-02-04 22:30:54 -0800 | [diff] [blame] | 313 | int cpu = current_thread_info()->cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | IPI_handler(cpu); |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 315 | if (cpu != 0) |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 316 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | #endif |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 318 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | } |
| 320 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | int cpu(void) |
| 322 | { |
Jeff Dike | a5a678c | 2008-02-04 22:30:54 -0800 | [diff] [blame] | 323 | return current_thread_info()->cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | } |
| 325 | |
| 326 | static atomic_t using_sysemu = ATOMIC_INIT(0); |
| 327 | int sysemu_supported; |
| 328 | |
| 329 | void set_using_sysemu(int value) |
| 330 | { |
| 331 | if (value > sysemu_supported) |
| 332 | return; |
| 333 | atomic_set(&using_sysemu, value); |
| 334 | } |
| 335 | |
| 336 | int get_using_sysemu(void) |
| 337 | { |
| 338 | return atomic_read(&using_sysemu); |
| 339 | } |
| 340 | |
| 341 | static int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int *eof, void *data) |
| 342 | { |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 343 | if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size) |
| 344 | /* No overflow */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | *eof = 1; |
| 346 | |
| 347 | return strlen(buf); |
| 348 | } |
| 349 | |
Al Viro | 4d338e1 | 2006-03-31 02:30:15 -0800 | [diff] [blame] | 350 | 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] | 351 | { |
| 352 | char tmp[2]; |
| 353 | |
| 354 | if (copy_from_user(tmp, buf, 1)) |
| 355 | return -EFAULT; |
| 356 | |
| 357 | if (tmp[0] >= '0' && tmp[0] <= '2') |
| 358 | set_using_sysemu(tmp[0] - '0'); |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 359 | /* We use the first char, but pretend to write everything */ |
| 360 | return count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | } |
| 362 | |
| 363 | int __init make_proc_sysemu(void) |
| 364 | { |
| 365 | struct proc_dir_entry *ent; |
| 366 | if (!sysemu_supported) |
| 367 | return 0; |
| 368 | |
| 369 | ent = create_proc_entry("sysemu", 0600, &proc_root); |
| 370 | |
| 371 | if (ent == NULL) |
| 372 | { |
Christophe Lucas | 30f417c | 2005-07-28 21:16:12 -0700 | [diff] [blame] | 373 | printk(KERN_WARNING "Failed to register /proc/sysemu\n"); |
Jeff Dike | 6e21aec | 2007-05-06 14:51:21 -0700 | [diff] [blame] | 374 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | } |
| 376 | |
| 377 | ent->read_proc = proc_read_sysemu; |
| 378 | ent->write_proc = proc_write_sysemu; |
| 379 | |
| 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | late_initcall(make_proc_sysemu); |
| 384 | |
| 385 | int singlestepping(void * t) |
| 386 | { |
| 387 | struct task_struct *task = t ? t : current; |
| 388 | |
Jeff Dike | c5d4bb1 | 2008-02-04 22:31:14 -0800 | [diff] [blame] | 389 | if (!(task->ptrace & PT_DTRACE)) |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 390 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | |
| 392 | if (task->thread.singlestep_syscall) |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 393 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
| 395 | return 2; |
| 396 | } |
| 397 | |
Bodo Stroesser | b8bd022 | 2005-05-06 21:30:53 -0700 | [diff] [blame] | 398 | /* |
| 399 | * Only x86 and x86_64 have an arch_align_stack(). |
| 400 | * All other arches have "#define arch_align_stack(x) (x)" |
| 401 | * in their asm/system.h |
| 402 | * As this is included in UML from asm-um/system-generic.h, |
| 403 | * we can use it to behave as the subarch does. |
| 404 | */ |
| 405 | #ifndef arch_align_stack |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | unsigned long arch_align_stack(unsigned long sp) |
| 407 | { |
Jeff Dike | 8f80e94 | 2006-09-25 23:33:01 -0700 | [diff] [blame] | 408 | if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | sp -= get_random_int() % 8192; |
| 410 | return sp & ~0xf; |
| 411 | } |
Bodo Stroesser | b8bd022 | 2005-05-06 21:30:53 -0700 | [diff] [blame] | 412 | #endif |
Jeff Dike | c112746 | 2008-02-04 22:30:36 -0800 | [diff] [blame] | 413 | |
| 414 | unsigned long get_wchan(struct task_struct *p) |
| 415 | { |
| 416 | unsigned long stack_page, sp, ip; |
| 417 | bool seen_sched = 0; |
| 418 | |
| 419 | if ((p == NULL) || (p == current) || (p->state == TASK_RUNNING)) |
| 420 | return 0; |
| 421 | |
| 422 | stack_page = (unsigned long) task_stack_page(p); |
| 423 | /* Bail if the process has no kernel stack for some reason */ |
| 424 | if (stack_page == 0) |
| 425 | return 0; |
| 426 | |
| 427 | sp = p->thread.switch_buf->JB_SP; |
| 428 | /* |
| 429 | * Bail if the stack pointer is below the bottom of the kernel |
| 430 | * stack for some reason |
| 431 | */ |
| 432 | if (sp < stack_page) |
| 433 | return 0; |
| 434 | |
| 435 | while (sp < stack_page + THREAD_SIZE) { |
| 436 | ip = *((unsigned long *) sp); |
| 437 | if (in_sched_functions(ip)) |
| 438 | /* Ignore everything until we're above the scheduler */ |
| 439 | seen_sched = 1; |
| 440 | else if (kernel_text_address(ip) && seen_sched) |
| 441 | return ip; |
| 442 | |
| 443 | sp += sizeof(unsigned long); |
| 444 | } |
| 445 | |
| 446 | return 0; |
| 447 | } |
Jeff Dike | 8192ab4 | 2008-02-04 22:30:53 -0800 | [diff] [blame] | 448 | |
| 449 | int elf_core_copy_fpregs(struct task_struct *t, elf_fpregset_t *fpu) |
| 450 | { |
| 451 | int cpu = current_thread_info()->cpu; |
| 452 | |
| 453 | return save_fp_registers(userspace_pid[cpu], (unsigned long *) fpu); |
| 454 | } |
| 455 | |