1995473aeSJeff Dike /* 2ba180fd4SJeff Dike * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 3995473aeSJeff Dike * Copyright 2003 PathScale, Inc. 4995473aeSJeff Dike * Licensed under the GPL 5995473aeSJeff Dike */ 6995473aeSJeff Dike 7c5d4bb17SJeff Dike #include <linux/stddef.h> 8c5d4bb17SJeff Dike #include <linux/err.h> 9c5d4bb17SJeff Dike #include <linux/hardirq.h> 10c5d4bb17SJeff Dike #include <linux/mm.h> 116613c5e8SAlexey Dobriyan #include <linux/module.h> 12c5d4bb17SJeff Dike #include <linux/personality.h> 13c5d4bb17SJeff Dike #include <linux/proc_fs.h> 14c5d4bb17SJeff Dike #include <linux/ptrace.h> 15c5d4bb17SJeff Dike #include <linux/random.h> 165a0e3ad6STejun Heo #include <linux/slab.h> 17c5d4bb17SJeff Dike #include <linux/sched.h> 186613c5e8SAlexey Dobriyan #include <linux/seq_file.h> 19c5d4bb17SJeff Dike #include <linux/tick.h> 20c5d4bb17SJeff Dike #include <linux/threads.h> 21c5d4bb17SJeff Dike #include <asm/current.h> 22c5d4bb17SJeff Dike #include <asm/pgtable.h> 23445c5786SAl Viro #include <asm/mmu_context.h> 24c5d4bb17SJeff Dike #include <asm/uaccess.h> 254ff83ce1SJeff Dike #include "as-layout.h" 26ba180fd4SJeff Dike #include "kern_util.h" 27995473aeSJeff Dike #include "os.h" 2877bf4400SJeff Dike #include "skas.h" 29995473aeSJeff Dike 30ba180fd4SJeff Dike /* 31ba180fd4SJeff Dike * This is a per-cpu array. A processor only modifies its entry and it only 32995473aeSJeff Dike * cares about its entry, so it's OK if another processor is modifying its 33995473aeSJeff Dike * entry. 34995473aeSJeff Dike */ 35995473aeSJeff Dike struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } }; 36995473aeSJeff Dike 372dc5802aSKarol Swietlicki static inline int external_pid(void) 38995473aeSJeff Dike { 3977bf4400SJeff Dike /* FIXME: Need to look up userspace_pid by cpu */ 40ba180fd4SJeff Dike return userspace_pid[0]; 41995473aeSJeff Dike } 42995473aeSJeff Dike 43995473aeSJeff Dike int pid_to_processor_id(int pid) 44995473aeSJeff Dike { 45995473aeSJeff Dike int i; 46995473aeSJeff Dike 47995473aeSJeff Dike for (i = 0; i < ncpus; i++) { 486e21aec3SJeff Dike if (cpu_tasks[i].pid == pid) 496e21aec3SJeff Dike return i; 50995473aeSJeff Dike } 516e21aec3SJeff Dike return -1; 52995473aeSJeff Dike } 53995473aeSJeff Dike 54995473aeSJeff Dike void free_stack(unsigned long stack, int order) 55995473aeSJeff Dike { 56995473aeSJeff Dike free_pages(stack, order); 57995473aeSJeff Dike } 58995473aeSJeff Dike 59995473aeSJeff Dike unsigned long alloc_stack(int order, int atomic) 60995473aeSJeff Dike { 61995473aeSJeff Dike unsigned long page; 62995473aeSJeff Dike gfp_t flags = GFP_KERNEL; 63995473aeSJeff Dike 64995473aeSJeff Dike if (atomic) 65995473aeSJeff Dike flags = GFP_ATOMIC; 66995473aeSJeff Dike page = __get_free_pages(flags, order); 675c8aaceaSJeff Dike 686e21aec3SJeff Dike return page; 69995473aeSJeff Dike } 70995473aeSJeff Dike 71995473aeSJeff Dike int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) 72995473aeSJeff Dike { 73995473aeSJeff Dike int pid; 74995473aeSJeff Dike 75995473aeSJeff Dike current->thread.request.u.thread.proc = fn; 76995473aeSJeff Dike current->thread.request.u.thread.arg = arg; 77995473aeSJeff Dike pid = do_fork(CLONE_VM | CLONE_UNTRACED | flags, 0, 78995473aeSJeff Dike ¤t->thread.regs, 0, NULL, NULL); 796e21aec3SJeff Dike return pid; 80995473aeSJeff Dike } 8173395a00SAl Viro EXPORT_SYMBOL(kernel_thread); 82995473aeSJeff Dike 836e21aec3SJeff Dike static inline void set_current(struct task_struct *task) 84995473aeSJeff Dike { 85995473aeSJeff Dike cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task) 862dc5802aSKarol Swietlicki { external_pid(), task }); 87995473aeSJeff Dike } 88995473aeSJeff Dike 89291248fdSKarol Swietlicki extern void arch_switch_to(struct task_struct *to); 9077bf4400SJeff Dike 9176b278edSRichard Weinberger void *__switch_to(struct task_struct *from, struct task_struct *to) 92995473aeSJeff Dike { 93995473aeSJeff Dike to->thread.prev_sched = from; 94995473aeSJeff Dike set_current(to); 95995473aeSJeff Dike 96995473aeSJeff Dike do { 97995473aeSJeff Dike current->thread.saved_task = NULL; 9877bf4400SJeff Dike 99c5d4bb17SJeff Dike switch_threads(&from->thread.switch_buf, 100c5d4bb17SJeff Dike &to->thread.switch_buf); 10177bf4400SJeff Dike 102291248fdSKarol Swietlicki arch_switch_to(current); 10377bf4400SJeff Dike 104995473aeSJeff Dike if (current->thread.saved_task) 105995473aeSJeff Dike show_regs(&(current->thread.regs)); 106c5d4bb17SJeff Dike to = current->thread.saved_task; 107c5d4bb17SJeff Dike from = current; 108995473aeSJeff Dike } while (current->thread.saved_task); 109995473aeSJeff Dike 1106e21aec3SJeff Dike return current->thread.prev_sched; 111995473aeSJeff Dike } 112995473aeSJeff Dike 113995473aeSJeff Dike void interrupt_end(void) 114995473aeSJeff Dike { 1156e21aec3SJeff Dike if (need_resched()) 1166e21aec3SJeff Dike schedule(); 1176e21aec3SJeff Dike if (test_tsk_thread_flag(current, TIF_SIGPENDING)) 1186e21aec3SJeff Dike do_signal(); 119995473aeSJeff Dike } 120995473aeSJeff Dike 121995473aeSJeff Dike void exit_thread(void) 122995473aeSJeff Dike { 123995473aeSJeff Dike } 124995473aeSJeff Dike 125c2220b2aSAl Viro int get_current_pid(void) 126995473aeSJeff Dike { 127c2220b2aSAl Viro return task_pid_nr(current); 128995473aeSJeff Dike } 129995473aeSJeff Dike 130ba180fd4SJeff Dike /* 131ba180fd4SJeff Dike * This is called magically, by its address being stuffed in a jmp_buf 13277bf4400SJeff Dike * and being longjmp-d to. 13377bf4400SJeff Dike */ 13477bf4400SJeff Dike void new_thread_handler(void) 13577bf4400SJeff Dike { 13677bf4400SJeff Dike int (*fn)(void *), n; 13777bf4400SJeff Dike void *arg; 13877bf4400SJeff Dike 13977bf4400SJeff Dike if (current->thread.prev_sched != NULL) 14077bf4400SJeff Dike schedule_tail(current->thread.prev_sched); 14177bf4400SJeff Dike current->thread.prev_sched = NULL; 14277bf4400SJeff Dike 14377bf4400SJeff Dike fn = current->thread.request.u.thread.proc; 14477bf4400SJeff Dike arg = current->thread.request.u.thread.arg; 14577bf4400SJeff Dike 146ba180fd4SJeff Dike /* 147ba180fd4SJeff Dike * The return value is 1 if the kernel thread execs a process, 14877bf4400SJeff Dike * 0 if it just exits 14977bf4400SJeff Dike */ 15077bf4400SJeff Dike n = run_kernel_thread(fn, arg, ¤t->thread.exec_buf); 15177bf4400SJeff Dike if (n == 1) { 15277bf4400SJeff Dike /* Handle any immediate reschedules or signals */ 15377bf4400SJeff Dike interrupt_end(); 15477bf4400SJeff Dike userspace(¤t->thread.regs.regs); 15577bf4400SJeff Dike } 15677bf4400SJeff Dike else do_exit(0); 15777bf4400SJeff Dike } 15877bf4400SJeff Dike 15977bf4400SJeff Dike /* Called magically, see new_thread_handler above */ 16077bf4400SJeff Dike void fork_handler(void) 16177bf4400SJeff Dike { 16277bf4400SJeff Dike force_flush_all(); 16377bf4400SJeff Dike 16477bf4400SJeff Dike schedule_tail(current->thread.prev_sched); 16577bf4400SJeff Dike 166ba180fd4SJeff Dike /* 167ba180fd4SJeff Dike * XXX: if interrupt_end() calls schedule, this call to 16877bf4400SJeff Dike * arch_switch_to isn't needed. We could want to apply this to 169ba180fd4SJeff Dike * improve performance. -bb 170ba180fd4SJeff Dike */ 171291248fdSKarol Swietlicki arch_switch_to(current); 17277bf4400SJeff Dike 17377bf4400SJeff Dike current->thread.prev_sched = NULL; 17477bf4400SJeff Dike 17577bf4400SJeff Dike /* Handle any immediate reschedules or signals */ 17677bf4400SJeff Dike interrupt_end(); 17777bf4400SJeff Dike 17877bf4400SJeff Dike userspace(¤t->thread.regs.regs); 17977bf4400SJeff Dike } 18077bf4400SJeff Dike 1816f2c55b8SAlexey Dobriyan int copy_thread(unsigned long clone_flags, unsigned long sp, 182995473aeSJeff Dike unsigned long stack_top, struct task_struct * p, 183995473aeSJeff Dike struct pt_regs *regs) 184995473aeSJeff Dike { 18577bf4400SJeff Dike void (*handler)(void); 18677bf4400SJeff Dike int ret = 0; 187995473aeSJeff Dike 188995473aeSJeff Dike p->thread = (struct thread_struct) INIT_THREAD; 189995473aeSJeff Dike 19077bf4400SJeff Dike if (current->thread.forking) { 19177bf4400SJeff Dike memcpy(&p->thread.regs.regs, ®s->regs, 19277bf4400SJeff Dike sizeof(p->thread.regs.regs)); 19318badddaSJeff Dike REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.gp, 0); 19477bf4400SJeff Dike if (sp != 0) 19518badddaSJeff Dike REGS_SP(p->thread.regs.regs.gp) = sp; 196995473aeSJeff Dike 19777bf4400SJeff Dike handler = fork_handler; 19877bf4400SJeff Dike 19977bf4400SJeff Dike arch_copy_thread(¤t->thread.arch, &p->thread.arch); 20077bf4400SJeff Dike } 20177bf4400SJeff Dike else { 202fbfe9c84SIngo van Lil get_safe_registers(p->thread.regs.regs.gp, p->thread.regs.regs.fp); 20377bf4400SJeff Dike p->thread.request.u.thread = current->thread.request.u.thread; 20477bf4400SJeff Dike handler = new_thread_handler; 20577bf4400SJeff Dike } 20677bf4400SJeff Dike 20777bf4400SJeff Dike new_thread(task_stack_page(p), &p->thread.switch_buf, handler); 20877bf4400SJeff Dike 20977bf4400SJeff Dike if (current->thread.forking) { 210995473aeSJeff Dike clear_flushed_tls(p); 211995473aeSJeff Dike 212995473aeSJeff Dike /* 213995473aeSJeff Dike * Set a new TLS for the child thread? 214995473aeSJeff Dike */ 215995473aeSJeff Dike if (clone_flags & CLONE_SETTLS) 216995473aeSJeff Dike ret = arch_copy_tls(p); 21777bf4400SJeff Dike } 218995473aeSJeff Dike 219995473aeSJeff Dike return ret; 220995473aeSJeff Dike } 221995473aeSJeff Dike 222995473aeSJeff Dike void initial_thread_cb(void (*proc)(void *), void *arg) 223995473aeSJeff Dike { 224995473aeSJeff Dike int save_kmalloc_ok = kmalloc_ok; 225995473aeSJeff Dike 226995473aeSJeff Dike kmalloc_ok = 0; 2276aa802ceSJeff Dike initial_thread_cb_skas(proc, arg); 228995473aeSJeff Dike kmalloc_ok = save_kmalloc_ok; 229995473aeSJeff Dike } 230995473aeSJeff Dike 231995473aeSJeff Dike void default_idle(void) 232995473aeSJeff Dike { 233b160fb63SJeff Dike unsigned long long nsecs; 234b160fb63SJeff Dike 235995473aeSJeff Dike while (1) { 236995473aeSJeff Dike /* endless idle loop with no priority at all */ 237995473aeSJeff Dike 238995473aeSJeff Dike /* 239995473aeSJeff Dike * although we are an idle CPU, we do not want to 240995473aeSJeff Dike * get into the scheduler unnecessarily. 241995473aeSJeff Dike */ 242995473aeSJeff Dike if (need_resched()) 243995473aeSJeff Dike schedule(); 244995473aeSJeff Dike 2451268fbc7SFrederic Weisbecker tick_nohz_idle_enter(); 2461268fbc7SFrederic Weisbecker rcu_idle_enter(); 247b160fb63SJeff Dike nsecs = disable_timer(); 248b160fb63SJeff Dike idle_sleep(nsecs); 2491268fbc7SFrederic Weisbecker rcu_idle_exit(); 2501268fbc7SFrederic Weisbecker tick_nohz_idle_exit(); 251995473aeSJeff Dike } 252995473aeSJeff Dike } 253995473aeSJeff Dike 254995473aeSJeff Dike void cpu_idle(void) 255995473aeSJeff Dike { 256a5a678c8SJeff Dike cpu_tasks[current_thread_info()->cpu].pid = os_getpid(); 25777bf4400SJeff Dike default_idle(); 258995473aeSJeff Dike } 259995473aeSJeff Dike 260995473aeSJeff Dike int __cant_sleep(void) { 261995473aeSJeff Dike return in_atomic() || irqs_disabled() || in_interrupt(); 262995473aeSJeff Dike /* Is in_interrupt() really needed? */ 263995473aeSJeff Dike } 264995473aeSJeff Dike 265995473aeSJeff Dike int user_context(unsigned long sp) 266995473aeSJeff Dike { 267995473aeSJeff Dike unsigned long stack; 268995473aeSJeff Dike 269995473aeSJeff Dike stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER); 270a5a678c8SJeff Dike return stack != (unsigned long) current_thread_info(); 271995473aeSJeff Dike } 272995473aeSJeff Dike 273995473aeSJeff Dike extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end; 274995473aeSJeff Dike 275995473aeSJeff Dike void do_uml_exitcalls(void) 276995473aeSJeff Dike { 277995473aeSJeff Dike exitcall_t *call; 278995473aeSJeff Dike 279995473aeSJeff Dike call = &__uml_exitcall_end; 280995473aeSJeff Dike while (--call >= &__uml_exitcall_begin) 281995473aeSJeff Dike (*call)(); 282995473aeSJeff Dike } 283995473aeSJeff Dike 284c0a9290eSWANG Cong char *uml_strdup(const char *string) 285995473aeSJeff Dike { 286995473aeSJeff Dike return kstrdup(string, GFP_KERNEL); 287995473aeSJeff Dike } 28873395a00SAl Viro EXPORT_SYMBOL(uml_strdup); 289995473aeSJeff Dike 290995473aeSJeff Dike int copy_to_user_proc(void __user *to, void *from, int size) 291995473aeSJeff Dike { 2926e21aec3SJeff Dike return copy_to_user(to, from, size); 293995473aeSJeff Dike } 294995473aeSJeff Dike 295995473aeSJeff Dike int copy_from_user_proc(void *to, void __user *from, int size) 296995473aeSJeff Dike { 2976e21aec3SJeff Dike return copy_from_user(to, from, size); 298995473aeSJeff Dike } 299995473aeSJeff Dike 300995473aeSJeff Dike int clear_user_proc(void __user *buf, int size) 301995473aeSJeff Dike { 3026e21aec3SJeff Dike return clear_user(buf, size); 303995473aeSJeff Dike } 304995473aeSJeff Dike 305995473aeSJeff Dike int strlen_user_proc(char __user *str) 306995473aeSJeff Dike { 3076e21aec3SJeff Dike return strlen_user(str); 308995473aeSJeff Dike } 309995473aeSJeff Dike 310995473aeSJeff Dike int smp_sigio_handler(void) 311995473aeSJeff Dike { 312995473aeSJeff Dike #ifdef CONFIG_SMP 313a5a678c8SJeff Dike int cpu = current_thread_info()->cpu; 314995473aeSJeff Dike IPI_handler(cpu); 315995473aeSJeff Dike if (cpu != 0) 3166e21aec3SJeff Dike return 1; 317995473aeSJeff Dike #endif 3186e21aec3SJeff Dike return 0; 319995473aeSJeff Dike } 320995473aeSJeff Dike 321995473aeSJeff Dike int cpu(void) 322995473aeSJeff Dike { 323a5a678c8SJeff Dike return current_thread_info()->cpu; 324995473aeSJeff Dike } 325995473aeSJeff Dike 326995473aeSJeff Dike static atomic_t using_sysemu = ATOMIC_INIT(0); 327995473aeSJeff Dike int sysemu_supported; 328995473aeSJeff Dike 329995473aeSJeff Dike void set_using_sysemu(int value) 330995473aeSJeff Dike { 331995473aeSJeff Dike if (value > sysemu_supported) 332995473aeSJeff Dike return; 333995473aeSJeff Dike atomic_set(&using_sysemu, value); 334995473aeSJeff Dike } 335995473aeSJeff Dike 336995473aeSJeff Dike int get_using_sysemu(void) 337995473aeSJeff Dike { 338995473aeSJeff Dike return atomic_read(&using_sysemu); 339995473aeSJeff Dike } 340995473aeSJeff Dike 3416613c5e8SAlexey Dobriyan static int sysemu_proc_show(struct seq_file *m, void *v) 342995473aeSJeff Dike { 3436613c5e8SAlexey Dobriyan seq_printf(m, "%d\n", get_using_sysemu()); 3446613c5e8SAlexey Dobriyan return 0; 345995473aeSJeff Dike } 346995473aeSJeff Dike 3476613c5e8SAlexey Dobriyan static int sysemu_proc_open(struct inode *inode, struct file *file) 3486613c5e8SAlexey Dobriyan { 3496613c5e8SAlexey Dobriyan return single_open(file, sysemu_proc_show, NULL); 3506613c5e8SAlexey Dobriyan } 3516613c5e8SAlexey Dobriyan 3526613c5e8SAlexey Dobriyan static ssize_t sysemu_proc_write(struct file *file, const char __user *buf, 3536613c5e8SAlexey Dobriyan size_t count, loff_t *pos) 354995473aeSJeff Dike { 355995473aeSJeff Dike char tmp[2]; 356995473aeSJeff Dike 357995473aeSJeff Dike if (copy_from_user(tmp, buf, 1)) 358995473aeSJeff Dike return -EFAULT; 359995473aeSJeff Dike 360995473aeSJeff Dike if (tmp[0] >= '0' && tmp[0] <= '2') 361995473aeSJeff Dike set_using_sysemu(tmp[0] - '0'); 362ba180fd4SJeff Dike /* We use the first char, but pretend to write everything */ 363ba180fd4SJeff Dike return count; 364995473aeSJeff Dike } 365995473aeSJeff Dike 3666613c5e8SAlexey Dobriyan static const struct file_operations sysemu_proc_fops = { 3676613c5e8SAlexey Dobriyan .owner = THIS_MODULE, 3686613c5e8SAlexey Dobriyan .open = sysemu_proc_open, 3696613c5e8SAlexey Dobriyan .read = seq_read, 3706613c5e8SAlexey Dobriyan .llseek = seq_lseek, 3716613c5e8SAlexey Dobriyan .release = single_release, 3726613c5e8SAlexey Dobriyan .write = sysemu_proc_write, 3736613c5e8SAlexey Dobriyan }; 3746613c5e8SAlexey Dobriyan 375995473aeSJeff Dike int __init make_proc_sysemu(void) 376995473aeSJeff Dike { 377995473aeSJeff Dike struct proc_dir_entry *ent; 378995473aeSJeff Dike if (!sysemu_supported) 379995473aeSJeff Dike return 0; 380995473aeSJeff Dike 3816613c5e8SAlexey Dobriyan ent = proc_create("sysemu", 0600, NULL, &sysemu_proc_fops); 382995473aeSJeff Dike 383995473aeSJeff Dike if (ent == NULL) 384995473aeSJeff Dike { 385995473aeSJeff Dike printk(KERN_WARNING "Failed to register /proc/sysemu\n"); 3866e21aec3SJeff Dike return 0; 387995473aeSJeff Dike } 388995473aeSJeff Dike 389995473aeSJeff Dike return 0; 390995473aeSJeff Dike } 391995473aeSJeff Dike 392995473aeSJeff Dike late_initcall(make_proc_sysemu); 393995473aeSJeff Dike 394995473aeSJeff Dike int singlestepping(void * t) 395995473aeSJeff Dike { 396995473aeSJeff Dike struct task_struct *task = t ? t : current; 397995473aeSJeff Dike 398995473aeSJeff Dike if (!(task->ptrace & PT_DTRACE)) 399ba180fd4SJeff Dike return 0; 400995473aeSJeff Dike 401995473aeSJeff Dike if (task->thread.singlestep_syscall) 402ba180fd4SJeff Dike return 1; 403995473aeSJeff Dike 404995473aeSJeff Dike return 2; 405995473aeSJeff Dike } 406995473aeSJeff Dike 407995473aeSJeff Dike /* 408995473aeSJeff Dike * Only x86 and x86_64 have an arch_align_stack(). 409995473aeSJeff Dike * All other arches have "#define arch_align_stack(x) (x)" 410995473aeSJeff Dike * in their asm/system.h 411995473aeSJeff Dike * As this is included in UML from asm-um/system-generic.h, 412995473aeSJeff Dike * we can use it to behave as the subarch does. 413995473aeSJeff Dike */ 414995473aeSJeff Dike #ifndef arch_align_stack 415995473aeSJeff Dike unsigned long arch_align_stack(unsigned long sp) 416995473aeSJeff Dike { 417995473aeSJeff Dike if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) 418995473aeSJeff Dike sp -= get_random_int() % 8192; 419995473aeSJeff Dike return sp & ~0xf; 420995473aeSJeff Dike } 421995473aeSJeff Dike #endif 422c1127465SJeff Dike 423c1127465SJeff Dike unsigned long get_wchan(struct task_struct *p) 424c1127465SJeff Dike { 425c1127465SJeff Dike unsigned long stack_page, sp, ip; 426c1127465SJeff Dike bool seen_sched = 0; 427c1127465SJeff Dike 428c1127465SJeff Dike if ((p == NULL) || (p == current) || (p->state == TASK_RUNNING)) 429c1127465SJeff Dike return 0; 430c1127465SJeff Dike 431c1127465SJeff Dike stack_page = (unsigned long) task_stack_page(p); 432c1127465SJeff Dike /* Bail if the process has no kernel stack for some reason */ 433c1127465SJeff Dike if (stack_page == 0) 434c1127465SJeff Dike return 0; 435c1127465SJeff Dike 436c1127465SJeff Dike sp = p->thread.switch_buf->JB_SP; 437c1127465SJeff Dike /* 438c1127465SJeff Dike * Bail if the stack pointer is below the bottom of the kernel 439c1127465SJeff Dike * stack for some reason 440c1127465SJeff Dike */ 441c1127465SJeff Dike if (sp < stack_page) 442c1127465SJeff Dike return 0; 443c1127465SJeff Dike 444c1127465SJeff Dike while (sp < stack_page + THREAD_SIZE) { 445c1127465SJeff Dike ip = *((unsigned long *) sp); 446c1127465SJeff Dike if (in_sched_functions(ip)) 447c1127465SJeff Dike /* Ignore everything until we're above the scheduler */ 448c1127465SJeff Dike seen_sched = 1; 449c1127465SJeff Dike else if (kernel_text_address(ip) && seen_sched) 450c1127465SJeff Dike return ip; 451c1127465SJeff Dike 452c1127465SJeff Dike sp += sizeof(unsigned long); 453c1127465SJeff Dike } 454c1127465SJeff Dike 455c1127465SJeff Dike return 0; 456c1127465SJeff Dike } 4578192ab42SJeff Dike 4588192ab42SJeff Dike int elf_core_copy_fpregs(struct task_struct *t, elf_fpregset_t *fpu) 4598192ab42SJeff Dike { 4608192ab42SJeff Dike int cpu = current_thread_info()->cpu; 4618192ab42SJeff Dike 4628192ab42SJeff Dike return save_fp_registers(userspace_pid[cpu], (unsigned long *) fpu); 4638192ab42SJeff Dike } 4648192ab42SJeff Dike 465