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 7ba180fd4SJeff Dike #include "linux/stddef.h" 8ba180fd4SJeff Dike #include "linux/err.h" 9ba180fd4SJeff Dike #include "linux/hardirq.h" 10995473aeSJeff Dike #include "linux/mm.h" 11ba180fd4SJeff Dike #include "linux/personality.h" 12995473aeSJeff Dike #include "linux/proc_fs.h" 13995473aeSJeff Dike #include "linux/ptrace.h" 14995473aeSJeff Dike #include "linux/random.h" 15ba180fd4SJeff Dike #include "linux/sched.h" 16d2753a6dSJeff Dike #include "linux/tick.h" 17ba180fd4SJeff Dike #include "linux/threads.h" 18995473aeSJeff Dike #include "asm/pgtable.h" 19995473aeSJeff Dike #include "asm/uaccess.h" 204ff83ce1SJeff Dike #include "as-layout.h" 21ba180fd4SJeff Dike #include "kern_util.h" 22995473aeSJeff Dike #include "os.h" 2377bf4400SJeff Dike #include "skas.h" 24ba180fd4SJeff Dike #include "tlb.h" 25995473aeSJeff Dike 26ba180fd4SJeff Dike /* 27ba180fd4SJeff Dike * This is a per-cpu array. A processor only modifies its entry and it only 28995473aeSJeff Dike * cares about its entry, so it's OK if another processor is modifying its 29995473aeSJeff Dike * entry. 30995473aeSJeff Dike */ 31995473aeSJeff Dike struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } }; 32995473aeSJeff Dike 336e21aec3SJeff Dike static inline int external_pid(struct task_struct *task) 34995473aeSJeff Dike { 3577bf4400SJeff Dike /* FIXME: Need to look up userspace_pid by cpu */ 36ba180fd4SJeff Dike return userspace_pid[0]; 37995473aeSJeff Dike } 38995473aeSJeff Dike 39995473aeSJeff Dike int pid_to_processor_id(int pid) 40995473aeSJeff Dike { 41995473aeSJeff Dike int i; 42995473aeSJeff Dike 43995473aeSJeff Dike for(i = 0; i < ncpus; i++) { 446e21aec3SJeff Dike if (cpu_tasks[i].pid == pid) 456e21aec3SJeff Dike return i; 46995473aeSJeff Dike } 476e21aec3SJeff Dike return -1; 48995473aeSJeff Dike } 49995473aeSJeff Dike 50995473aeSJeff Dike void free_stack(unsigned long stack, int order) 51995473aeSJeff Dike { 52995473aeSJeff Dike free_pages(stack, order); 53995473aeSJeff Dike } 54995473aeSJeff Dike 55995473aeSJeff Dike unsigned long alloc_stack(int order, int atomic) 56995473aeSJeff Dike { 57995473aeSJeff Dike unsigned long page; 58995473aeSJeff Dike gfp_t flags = GFP_KERNEL; 59995473aeSJeff Dike 60995473aeSJeff Dike if (atomic) 61995473aeSJeff Dike flags = GFP_ATOMIC; 62995473aeSJeff Dike page = __get_free_pages(flags, order); 63995473aeSJeff Dike if (page == 0) 646e21aec3SJeff Dike return 0; 655c8aaceaSJeff Dike 666e21aec3SJeff Dike return page; 67995473aeSJeff Dike } 68995473aeSJeff Dike 69995473aeSJeff Dike int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) 70995473aeSJeff Dike { 71995473aeSJeff Dike int pid; 72995473aeSJeff Dike 73995473aeSJeff Dike current->thread.request.u.thread.proc = fn; 74995473aeSJeff Dike current->thread.request.u.thread.arg = arg; 75995473aeSJeff Dike pid = do_fork(CLONE_VM | CLONE_UNTRACED | flags, 0, 76995473aeSJeff Dike ¤t->thread.regs, 0, NULL, NULL); 776e21aec3SJeff Dike return pid; 78995473aeSJeff Dike } 79995473aeSJeff Dike 806e21aec3SJeff Dike static inline void set_current(struct task_struct *task) 81995473aeSJeff Dike { 82995473aeSJeff Dike cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task) 83995473aeSJeff Dike { external_pid(task), task }); 84995473aeSJeff Dike } 85995473aeSJeff Dike 8677bf4400SJeff Dike extern void arch_switch_to(struct task_struct *from, struct task_struct *to); 8777bf4400SJeff Dike 88995473aeSJeff Dike void *_switch_to(void *prev, void *next, void *last) 89995473aeSJeff Dike { 90995473aeSJeff Dike struct task_struct *from = prev; 91995473aeSJeff Dike struct task_struct *to= next; 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 9977bf4400SJeff Dike switch_threads(&from->thread.switch_buf, 10077bf4400SJeff Dike &to->thread.switch_buf); 10177bf4400SJeff Dike 10277bf4400SJeff Dike arch_switch_to(current->thread.prev_sched, current); 10377bf4400SJeff Dike 104995473aeSJeff Dike if (current->thread.saved_task) 105995473aeSJeff Dike show_regs(&(current->thread.regs)); 106995473aeSJeff Dike next= current->thread.saved_task; 107995473aeSJeff Dike prev= current; 108995473aeSJeff Dike } while(current->thread.saved_task); 109995473aeSJeff Dike 1106e21aec3SJeff Dike return current->thread.prev_sched; 111995473aeSJeff Dike 112995473aeSJeff Dike } 113995473aeSJeff Dike 114995473aeSJeff Dike void interrupt_end(void) 115995473aeSJeff Dike { 1166e21aec3SJeff Dike if (need_resched()) 1176e21aec3SJeff Dike schedule(); 1186e21aec3SJeff Dike if (test_tsk_thread_flag(current, TIF_SIGPENDING)) 1196e21aec3SJeff Dike do_signal(); 120995473aeSJeff Dike } 121995473aeSJeff Dike 122995473aeSJeff Dike void exit_thread(void) 123995473aeSJeff Dike { 124995473aeSJeff Dike } 125995473aeSJeff Dike 126995473aeSJeff Dike void *get_current(void) 127995473aeSJeff Dike { 1286e21aec3SJeff Dike return current; 129995473aeSJeff Dike } 130995473aeSJeff Dike 13177bf4400SJeff Dike extern void schedule_tail(struct task_struct *prev); 13277bf4400SJeff Dike 133ba180fd4SJeff Dike /* 134ba180fd4SJeff Dike * This is called magically, by its address being stuffed in a jmp_buf 13577bf4400SJeff Dike * and being longjmp-d to. 13677bf4400SJeff Dike */ 13777bf4400SJeff Dike void new_thread_handler(void) 13877bf4400SJeff Dike { 13977bf4400SJeff Dike int (*fn)(void *), n; 14077bf4400SJeff Dike void *arg; 14177bf4400SJeff Dike 14277bf4400SJeff Dike if (current->thread.prev_sched != NULL) 14377bf4400SJeff Dike schedule_tail(current->thread.prev_sched); 14477bf4400SJeff Dike current->thread.prev_sched = NULL; 14577bf4400SJeff Dike 14677bf4400SJeff Dike fn = current->thread.request.u.thread.proc; 14777bf4400SJeff Dike arg = current->thread.request.u.thread.arg; 14877bf4400SJeff Dike 149ba180fd4SJeff Dike /* 150ba180fd4SJeff Dike * The return value is 1 if the kernel thread execs a process, 15177bf4400SJeff Dike * 0 if it just exits 15277bf4400SJeff Dike */ 15377bf4400SJeff Dike n = run_kernel_thread(fn, arg, ¤t->thread.exec_buf); 15477bf4400SJeff Dike if (n == 1) { 15577bf4400SJeff Dike /* Handle any immediate reschedules or signals */ 15677bf4400SJeff Dike interrupt_end(); 15777bf4400SJeff Dike userspace(¤t->thread.regs.regs); 15877bf4400SJeff Dike } 15977bf4400SJeff Dike else do_exit(0); 16077bf4400SJeff Dike } 16177bf4400SJeff Dike 16277bf4400SJeff Dike /* Called magically, see new_thread_handler above */ 16377bf4400SJeff Dike void fork_handler(void) 16477bf4400SJeff Dike { 16577bf4400SJeff Dike force_flush_all(); 16677bf4400SJeff Dike if (current->thread.prev_sched == NULL) 16777bf4400SJeff Dike panic("blech"); 16877bf4400SJeff Dike 16977bf4400SJeff Dike schedule_tail(current->thread.prev_sched); 17077bf4400SJeff Dike 171ba180fd4SJeff Dike /* 172ba180fd4SJeff Dike * XXX: if interrupt_end() calls schedule, this call to 17377bf4400SJeff Dike * arch_switch_to isn't needed. We could want to apply this to 174ba180fd4SJeff Dike * improve performance. -bb 175ba180fd4SJeff Dike */ 17677bf4400SJeff Dike arch_switch_to(current->thread.prev_sched, current); 17777bf4400SJeff Dike 17877bf4400SJeff Dike current->thread.prev_sched = NULL; 17977bf4400SJeff Dike 18077bf4400SJeff Dike /* Handle any immediate reschedules or signals */ 18177bf4400SJeff Dike interrupt_end(); 18277bf4400SJeff Dike 18377bf4400SJeff Dike userspace(¤t->thread.regs.regs); 18477bf4400SJeff Dike } 18577bf4400SJeff Dike 186995473aeSJeff Dike int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, 187995473aeSJeff Dike unsigned long stack_top, struct task_struct * p, 188995473aeSJeff Dike struct pt_regs *regs) 189995473aeSJeff Dike { 19077bf4400SJeff Dike void (*handler)(void); 19177bf4400SJeff Dike int ret = 0; 192995473aeSJeff Dike 193995473aeSJeff Dike p->thread = (struct thread_struct) INIT_THREAD; 194995473aeSJeff Dike 19577bf4400SJeff Dike if (current->thread.forking) { 19677bf4400SJeff Dike memcpy(&p->thread.regs.regs, ®s->regs, 19777bf4400SJeff Dike sizeof(p->thread.regs.regs)); 19818badddaSJeff Dike REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.gp, 0); 19977bf4400SJeff Dike if (sp != 0) 20018badddaSJeff Dike REGS_SP(p->thread.regs.regs.gp) = sp; 201995473aeSJeff Dike 20277bf4400SJeff Dike handler = fork_handler; 20377bf4400SJeff Dike 20477bf4400SJeff Dike arch_copy_thread(¤t->thread.arch, &p->thread.arch); 20577bf4400SJeff Dike } 20677bf4400SJeff Dike else { 20777bf4400SJeff Dike init_thread_registers(&p->thread.regs.regs); 20877bf4400SJeff Dike p->thread.request.u.thread = current->thread.request.u.thread; 20977bf4400SJeff Dike handler = new_thread_handler; 21077bf4400SJeff Dike } 21177bf4400SJeff Dike 21277bf4400SJeff Dike new_thread(task_stack_page(p), &p->thread.switch_buf, handler); 21377bf4400SJeff Dike 21477bf4400SJeff Dike if (current->thread.forking) { 215995473aeSJeff Dike clear_flushed_tls(p); 216995473aeSJeff Dike 217995473aeSJeff Dike /* 218995473aeSJeff Dike * Set a new TLS for the child thread? 219995473aeSJeff Dike */ 220995473aeSJeff Dike if (clone_flags & CLONE_SETTLS) 221995473aeSJeff Dike ret = arch_copy_tls(p); 22277bf4400SJeff Dike } 223995473aeSJeff Dike 224995473aeSJeff Dike return ret; 225995473aeSJeff Dike } 226995473aeSJeff Dike 227995473aeSJeff Dike void initial_thread_cb(void (*proc)(void *), void *arg) 228995473aeSJeff Dike { 229995473aeSJeff Dike int save_kmalloc_ok = kmalloc_ok; 230995473aeSJeff Dike 231995473aeSJeff Dike kmalloc_ok = 0; 2326aa802ceSJeff Dike initial_thread_cb_skas(proc, arg); 233995473aeSJeff Dike kmalloc_ok = save_kmalloc_ok; 234995473aeSJeff Dike } 235995473aeSJeff Dike 236995473aeSJeff Dike void default_idle(void) 237995473aeSJeff Dike { 238995473aeSJeff Dike while(1) { 239995473aeSJeff Dike /* endless idle loop with no priority at all */ 240995473aeSJeff Dike 241995473aeSJeff Dike /* 242995473aeSJeff Dike * although we are an idle CPU, we do not want to 243995473aeSJeff Dike * get into the scheduler unnecessarily. 244995473aeSJeff Dike */ 245995473aeSJeff Dike if (need_resched()) 246995473aeSJeff Dike schedule(); 247995473aeSJeff Dike 248d2753a6dSJeff Dike tick_nohz_stop_sched_tick(); 249181bde80SJeff Dike switch_timers(1); 250995473aeSJeff Dike idle_sleep(10); 251181bde80SJeff Dike switch_timers(0); 252d2753a6dSJeff Dike tick_nohz_restart_sched_tick(); 253995473aeSJeff Dike } 254995473aeSJeff Dike } 255995473aeSJeff Dike 256995473aeSJeff Dike void cpu_idle(void) 257995473aeSJeff Dike { 25877bf4400SJeff Dike cpu_tasks[current_thread->cpu].pid = os_getpid(); 25977bf4400SJeff Dike default_idle(); 260995473aeSJeff Dike } 261995473aeSJeff Dike 262995473aeSJeff Dike void *um_virt_to_phys(struct task_struct *task, unsigned long addr, 263995473aeSJeff Dike pte_t *pte_out) 264995473aeSJeff Dike { 265995473aeSJeff Dike pgd_t *pgd; 266995473aeSJeff Dike pud_t *pud; 267995473aeSJeff Dike pmd_t *pmd; 268995473aeSJeff Dike pte_t *pte; 269995473aeSJeff Dike pte_t ptent; 270995473aeSJeff Dike 271995473aeSJeff Dike if (task->mm == NULL) 2726e21aec3SJeff Dike return ERR_PTR(-EINVAL); 273995473aeSJeff Dike pgd = pgd_offset(task->mm, addr); 274995473aeSJeff Dike if (!pgd_present(*pgd)) 2756e21aec3SJeff Dike return ERR_PTR(-EINVAL); 276995473aeSJeff Dike 277995473aeSJeff Dike pud = pud_offset(pgd, addr); 278995473aeSJeff Dike if (!pud_present(*pud)) 2796e21aec3SJeff Dike return ERR_PTR(-EINVAL); 280995473aeSJeff Dike 281995473aeSJeff Dike pmd = pmd_offset(pud, addr); 282995473aeSJeff Dike if (!pmd_present(*pmd)) 2836e21aec3SJeff Dike return ERR_PTR(-EINVAL); 284995473aeSJeff Dike 285995473aeSJeff Dike pte = pte_offset_kernel(pmd, addr); 286995473aeSJeff Dike ptent = *pte; 287995473aeSJeff Dike if (!pte_present(ptent)) 2886e21aec3SJeff Dike return ERR_PTR(-EINVAL); 289995473aeSJeff Dike 290995473aeSJeff Dike if (pte_out != NULL) 291995473aeSJeff Dike *pte_out = ptent; 2926e21aec3SJeff Dike return (void *) (pte_val(ptent) & PAGE_MASK) + (addr & ~PAGE_MASK); 293995473aeSJeff Dike } 294995473aeSJeff Dike 295995473aeSJeff Dike char *current_cmd(void) 296995473aeSJeff Dike { 297995473aeSJeff Dike #if defined(CONFIG_SMP) || defined(CONFIG_HIGHMEM) 2986e21aec3SJeff Dike return "(Unknown)"; 299995473aeSJeff Dike #else 300995473aeSJeff Dike void *addr = um_virt_to_phys(current, current->mm->arg_start, NULL); 301995473aeSJeff Dike return IS_ERR(addr) ? "(Unknown)": __va((unsigned long) addr); 302995473aeSJeff Dike #endif 303995473aeSJeff Dike } 304995473aeSJeff Dike 305995473aeSJeff Dike void dump_thread(struct pt_regs *regs, struct user *u) 306995473aeSJeff Dike { 307995473aeSJeff Dike } 308995473aeSJeff Dike 309995473aeSJeff Dike int __cant_sleep(void) { 310995473aeSJeff Dike return in_atomic() || irqs_disabled() || in_interrupt(); 311995473aeSJeff Dike /* Is in_interrupt() really needed? */ 312995473aeSJeff Dike } 313995473aeSJeff Dike 314995473aeSJeff Dike int user_context(unsigned long sp) 315995473aeSJeff Dike { 316995473aeSJeff Dike unsigned long stack; 317995473aeSJeff Dike 318995473aeSJeff Dike stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER); 3196e21aec3SJeff Dike return stack != (unsigned long) current_thread; 320995473aeSJeff Dike } 321995473aeSJeff Dike 322995473aeSJeff Dike extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end; 323995473aeSJeff Dike 324995473aeSJeff Dike void do_uml_exitcalls(void) 325995473aeSJeff Dike { 326995473aeSJeff Dike exitcall_t *call; 327995473aeSJeff Dike 328995473aeSJeff Dike call = &__uml_exitcall_end; 329995473aeSJeff Dike while (--call >= &__uml_exitcall_begin) 330995473aeSJeff Dike (*call)(); 331995473aeSJeff Dike } 332995473aeSJeff Dike 333995473aeSJeff Dike char *uml_strdup(char *string) 334995473aeSJeff Dike { 335995473aeSJeff Dike return kstrdup(string, GFP_KERNEL); 336995473aeSJeff Dike } 337995473aeSJeff Dike 338995473aeSJeff Dike int copy_to_user_proc(void __user *to, void *from, int size) 339995473aeSJeff Dike { 3406e21aec3SJeff Dike return copy_to_user(to, from, size); 341995473aeSJeff Dike } 342995473aeSJeff Dike 343995473aeSJeff Dike int copy_from_user_proc(void *to, void __user *from, int size) 344995473aeSJeff Dike { 3456e21aec3SJeff Dike return copy_from_user(to, from, size); 346995473aeSJeff Dike } 347995473aeSJeff Dike 348995473aeSJeff Dike int clear_user_proc(void __user *buf, int size) 349995473aeSJeff Dike { 3506e21aec3SJeff Dike return clear_user(buf, size); 351995473aeSJeff Dike } 352995473aeSJeff Dike 353995473aeSJeff Dike int strlen_user_proc(char __user *str) 354995473aeSJeff Dike { 3556e21aec3SJeff Dike return strlen_user(str); 356995473aeSJeff Dike } 357995473aeSJeff Dike 358995473aeSJeff Dike int smp_sigio_handler(void) 359995473aeSJeff Dike { 360995473aeSJeff Dike #ifdef CONFIG_SMP 361995473aeSJeff Dike int cpu = current_thread->cpu; 362995473aeSJeff Dike IPI_handler(cpu); 363995473aeSJeff Dike if (cpu != 0) 3646e21aec3SJeff Dike return 1; 365995473aeSJeff Dike #endif 3666e21aec3SJeff Dike return 0; 367995473aeSJeff Dike } 368995473aeSJeff Dike 369995473aeSJeff Dike int cpu(void) 370995473aeSJeff Dike { 3716e21aec3SJeff Dike return current_thread->cpu; 372995473aeSJeff Dike } 373995473aeSJeff Dike 374995473aeSJeff Dike static atomic_t using_sysemu = ATOMIC_INIT(0); 375995473aeSJeff Dike int sysemu_supported; 376995473aeSJeff Dike 377995473aeSJeff Dike void set_using_sysemu(int value) 378995473aeSJeff Dike { 379995473aeSJeff Dike if (value > sysemu_supported) 380995473aeSJeff Dike return; 381995473aeSJeff Dike atomic_set(&using_sysemu, value); 382995473aeSJeff Dike } 383995473aeSJeff Dike 384995473aeSJeff Dike int get_using_sysemu(void) 385995473aeSJeff Dike { 386995473aeSJeff Dike return atomic_read(&using_sysemu); 387995473aeSJeff Dike } 388995473aeSJeff Dike 389995473aeSJeff Dike static int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int *eof, void *data) 390995473aeSJeff Dike { 391ba180fd4SJeff Dike if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size) 392ba180fd4SJeff Dike /* No overflow */ 393995473aeSJeff Dike *eof = 1; 394995473aeSJeff Dike 395995473aeSJeff Dike return strlen(buf); 396995473aeSJeff Dike } 397995473aeSJeff Dike 398995473aeSJeff Dike static int proc_write_sysemu(struct file *file,const char __user *buf, unsigned long count,void *data) 399995473aeSJeff Dike { 400995473aeSJeff Dike char tmp[2]; 401995473aeSJeff Dike 402995473aeSJeff Dike if (copy_from_user(tmp, buf, 1)) 403995473aeSJeff Dike return -EFAULT; 404995473aeSJeff Dike 405995473aeSJeff Dike if (tmp[0] >= '0' && tmp[0] <= '2') 406995473aeSJeff Dike set_using_sysemu(tmp[0] - '0'); 407ba180fd4SJeff Dike /* We use the first char, but pretend to write everything */ 408ba180fd4SJeff Dike return count; 409995473aeSJeff Dike } 410995473aeSJeff Dike 411995473aeSJeff Dike int __init make_proc_sysemu(void) 412995473aeSJeff Dike { 413995473aeSJeff Dike struct proc_dir_entry *ent; 414995473aeSJeff Dike if (!sysemu_supported) 415995473aeSJeff Dike return 0; 416995473aeSJeff Dike 417995473aeSJeff Dike ent = create_proc_entry("sysemu", 0600, &proc_root); 418995473aeSJeff Dike 419995473aeSJeff Dike if (ent == NULL) 420995473aeSJeff Dike { 421995473aeSJeff Dike printk(KERN_WARNING "Failed to register /proc/sysemu\n"); 4226e21aec3SJeff Dike return 0; 423995473aeSJeff Dike } 424995473aeSJeff Dike 425995473aeSJeff Dike ent->read_proc = proc_read_sysemu; 426995473aeSJeff Dike ent->write_proc = proc_write_sysemu; 427995473aeSJeff Dike 428995473aeSJeff Dike return 0; 429995473aeSJeff Dike } 430995473aeSJeff Dike 431995473aeSJeff Dike late_initcall(make_proc_sysemu); 432995473aeSJeff Dike 433995473aeSJeff Dike int singlestepping(void * t) 434995473aeSJeff Dike { 435995473aeSJeff Dike struct task_struct *task = t ? t : current; 436995473aeSJeff Dike 437995473aeSJeff Dike if ( ! (task->ptrace & PT_DTRACE) ) 438ba180fd4SJeff Dike return 0; 439995473aeSJeff Dike 440995473aeSJeff Dike if (task->thread.singlestep_syscall) 441ba180fd4SJeff Dike return 1; 442995473aeSJeff Dike 443995473aeSJeff Dike return 2; 444995473aeSJeff Dike } 445995473aeSJeff Dike 446995473aeSJeff Dike /* 447995473aeSJeff Dike * Only x86 and x86_64 have an arch_align_stack(). 448995473aeSJeff Dike * All other arches have "#define arch_align_stack(x) (x)" 449995473aeSJeff Dike * in their asm/system.h 450995473aeSJeff Dike * As this is included in UML from asm-um/system-generic.h, 451995473aeSJeff Dike * we can use it to behave as the subarch does. 452995473aeSJeff Dike */ 453995473aeSJeff Dike #ifndef arch_align_stack 454995473aeSJeff Dike unsigned long arch_align_stack(unsigned long sp) 455995473aeSJeff Dike { 456995473aeSJeff Dike if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) 457995473aeSJeff Dike sp -= get_random_int() % 8192; 458995473aeSJeff Dike return sp & ~0xf; 459995473aeSJeff Dike } 460995473aeSJeff Dike #endif 461