/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright 2003 PathScale, Inc.
* Licensed under the GPL
*/
#include "linux/kernel.h"
#include "linux/sched.h"
#include "linux/interrupt.h"
+#include "linux/string.h"
#include "linux/mm.h"
#include "linux/slab.h"
#include "linux/utsname.h"
#include "linux/module.h"
#include "linux/init.h"
#include "linux/capability.h"
+#include "linux/vmalloc.h"
+#include "linux/spinlock.h"
+#include "linux/proc_fs.h"
+#include "linux/ptrace.h"
+#include "linux/random.h"
#include "asm/unistd.h"
#include "asm/mman.h"
#include "asm/segment.h"
#include "asm/pgtable.h"
#include "asm/processor.h"
#include "asm/tlbflush.h"
-#include "asm/spinlock.h"
#include "asm/uaccess.h"
#include "asm/user.h"
#include "user_util.h"
#include "kern_util.h"
#include "kern.h"
#include "signal_kern.h"
-#include "signal_user.h"
#include "init.h"
#include "irq_user.h"
#include "mem_user.h"
-#include "time_user.h"
#include "tlb.h"
#include "frame_kern.h"
#include "sigcontext.h"
-#include "2_5compat.h"
#include "os.h"
#include "mode.h"
#include "mode_kern.h"
*/
struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } };
-struct task_struct *get_task(int pid, int require)
-{
- struct task_struct *task, *ret;
-
- ret = NULL;
- read_lock(&tasklist_lock);
- for_each_process(task){
- if(task->pid == pid){
- ret = task;
- break;
- }
- }
- read_unlock(&tasklist_lock);
- if(require && (ret == NULL)) panic("get_task couldn't find a task\n");
- return(ret);
-}
-
int external_pid(void *t)
{
struct task_struct *task = t ? t : current;
unsigned long alloc_stack(int order, int atomic)
{
unsigned long page;
- int flags = GFP_KERNEL;
+ gfp_t flags = GFP_KERNEL;
- if(atomic) flags |= GFP_ATOMIC;
- if((page = __get_free_pages(flags, order)) == 0)
+ if (atomic)
+ flags = GFP_ATOMIC;
+ page = __get_free_pages(flags, order);
+ if(page == 0)
return(0);
stack_protections(page);
return(page);
int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
{
- struct task_struct *p;
+ int pid;
current->thread.request.u.thread.proc = fn;
current->thread.request.u.thread.arg = arg;
- p = do_fork(CLONE_VM | flags, 0, NULL, 0, NULL, NULL);
- if(IS_ERR(p)) panic("do_fork failed in kernel_thread");
- return(p->pid);
-}
-
-void switch_mm(struct mm_struct *prev, struct mm_struct *next,
- struct task_struct *tsk)
-{
- unsigned cpu = smp_processor_id();
- if (prev != next)
- clear_bit(cpu, &prev->cpu_vm_mask);
- set_bit(cpu, &next->cpu_vm_mask);
+ pid = do_fork(CLONE_VM | CLONE_UNTRACED | flags, 0,
+ ¤t->thread.regs, 0, NULL, NULL);
+ if(pid < 0)
+ panic("do_fork failed in kernel_thread, errno = %d", pid);
+ return(pid);
}
void set_current(void *t)
{
struct task_struct *task = t;
- cpu_tasks[task->thread_info->cpu] = ((struct cpu_task)
+ cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task)
{ external_pid(task), task });
}
-void *switch_to(void *prev, void *next, void *last)
+void *_switch_to(void *prev, void *next, void *last)
{
- return(CHOOSE_MODE(switch_to_tt(prev, next),
- switch_to_skas(prev, next)));
+ struct task_struct *from = prev;
+ struct task_struct *to= next;
+
+ to->thread.prev_sched = from;
+ set_current(to);
+
+ do {
+ current->thread.saved_task = NULL ;
+ CHOOSE_MODE_PROC(switch_to_tt, switch_to_skas, prev, next);
+ if(current->thread.saved_task)
+ show_regs(&(current->thread.regs));
+ next= current->thread.saved_task;
+ prev= current;
+ } while(current->thread.saved_task);
+
+ return(current->thread.prev_sched);
+
}
void interrupt_end(void)
{
if(need_resched()) schedule();
- if(test_tsk_thread_flag(current, TIF_SIGPENDING)) do_signal(0);
+ if(test_tsk_thread_flag(current, TIF_SIGPENDING)) do_signal();
}
void release_thread(struct task_struct *task)
void exit_thread(void)
{
- CHOOSE_MODE(exit_thread_tt(), exit_thread_skas());
- unprotect_stack((unsigned long) current->thread_info);
+ unprotect_stack((unsigned long) current_thread);
}
void *get_current(void)
unsigned long stack_top, struct task_struct * p,
struct pt_regs *regs)
{
+ int ret;
+
p->thread = (struct thread_struct) INIT_THREAD;
- p->thread.kernel_stack =
- (unsigned long) p->thread_info + 2 * PAGE_SIZE;
- return(CHOOSE_MODE_PROC(copy_thread_tt, copy_thread_skas, nr,
- clone_flags, sp, stack_top, p, regs));
+ ret = CHOOSE_MODE_PROC(copy_thread_tt, copy_thread_skas, nr,
+ clone_flags, sp, stack_top, p, regs);
+
+ if (ret || !current->thread.forking)
+ goto out;
+
+ clear_flushed_tls(p);
+
+ /*
+ * Set a new TLS for the child thread?
+ */
+ if (clone_flags & CLONE_SETTLS)
+ ret = arch_copy_tls(p);
+
+out:
+ return ret;
}
void initial_thread_cb(void (*proc)(void *), void *arg)
void default_idle(void)
{
- idle_timer();
-
- atomic_inc(&init_mm.mm_count);
- current->mm = &init_mm;
- current->active_mm = &init_mm;
+ CHOOSE_MODE(uml_idle_timer(), (void) 0);
while(1){
/* endless idle loop with no priority at all */
- SET_PRI(current);
/*
* although we are an idle CPU, we do not want to
* get into the scheduler unnecessarily.
*/
- irq_stat[smp_processor_id()].idle_timestamp = jiffies;
if(need_resched())
schedule();
return(PAGE_SIZE);
}
-int page_mask(void)
-{
- return(PAGE_MASK);
-}
-
void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
pte_t *pte_out)
{
pgd_t *pgd;
+ pud_t *pud;
pmd_t *pmd;
pte_t *pte;
+ pte_t ptent;
if(task->mm == NULL)
return(ERR_PTR(-EINVAL));
pgd = pgd_offset(task->mm, addr);
- pmd = pmd_offset(pgd, addr);
+ if(!pgd_present(*pgd))
+ return(ERR_PTR(-EINVAL));
+
+ pud = pud_offset(pgd, addr);
+ if(!pud_present(*pud))
+ return(ERR_PTR(-EINVAL));
+
+ pmd = pmd_offset(pud, addr);
if(!pmd_present(*pmd))
return(ERR_PTR(-EINVAL));
+
pte = pte_offset_kernel(pmd, addr);
- if(!pte_present(*pte))
+ ptent = *pte;
+ if(!pte_present(ptent))
return(ERR_PTR(-EINVAL));
+
if(pte_out != NULL)
- *pte_out = *pte;
- return((void *) (pte_val(*pte) & PAGE_MASK) + (addr & ~PAGE_MASK));
+ *pte_out = ptent;
+ return((void *) (pte_val(ptent) & PAGE_MASK) + (addr & ~PAGE_MASK));
}
char *current_cmd(void)
EXPORT_SYMBOL(disable_hlt);
-extern int signal_frame_size;
-
void *um_kmalloc(int size)
{
- return(kmalloc(size, GFP_KERNEL));
+ return kmalloc(size, GFP_KERNEL);
}
void *um_kmalloc_atomic(int size)
{
- return(kmalloc(size, GFP_ATOMIC));
+ return kmalloc(size, GFP_ATOMIC);
+}
+
+void *um_vmalloc(int size)
+{
+ return vmalloc(size);
+}
+
+void *um_vmalloc_atomic(int size)
+{
+ return __vmalloc(size, GFP_ATOMIC | __GFP_HIGHMEM, PAGE_KERNEL);
+}
+
+int __cant_sleep(void) {
+ return in_atomic() || irqs_disabled() || in_interrupt();
+ /* Is in_interrupt() really needed? */
}
unsigned long get_fault_addr(void)
unsigned long stack;
stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
- stack += 2 * PAGE_SIZE;
- return(stack != current->thread.kernel_stack);
+ return(stack != (unsigned long) current_thread);
}
-extern void remove_umid_dir(void);
-
-__uml_exitcall(remove_umid_dir);
-
extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end;
void do_uml_exitcalls(void)
char *uml_strdup(char *string)
{
- char *new;
-
- new = kmalloc(strlen(string) + 1, GFP_KERNEL);
- if(new == NULL) return(NULL);
- strcpy(new, string);
- return(new);
-}
-
-void *get_init_task(void)
-{
- return(&init_thread_union.thread_info.task);
+ return kstrdup(string, GFP_KERNEL);
}
-int copy_to_user_proc(void *to, void *from, int size)
+int copy_to_user_proc(void __user *to, void *from, int size)
{
return(copy_to_user(to, from, size));
}
-int copy_from_user_proc(void *to, void *from, int size)
+int copy_from_user_proc(void *to, void __user *from, int size)
{
return(copy_from_user(to, from, size));
}
-int clear_user_proc(void *buf, int size)
+int clear_user_proc(void __user *buf, int size)
{
return(clear_user(buf, size));
}
+int strlen_user_proc(char __user *str)
+{
+ return(strlen_user(str));
+}
+
int smp_sigio_handler(void)
{
#ifdef CONFIG_SMP
- int cpu = current->thread_info->cpu;
+ int cpu = current_thread->cpu;
IPI_handler(cpu);
if(cpu != 0)
return(1);
return(0);
}
-int um_in_interrupt(void)
+int cpu(void)
{
- return(in_interrupt());
+ return(current_thread->cpu);
}
-int cpu(void)
+static atomic_t using_sysemu = ATOMIC_INIT(0);
+int sysemu_supported;
+
+void set_using_sysemu(int value)
+{
+ if (value > sysemu_supported)
+ return;
+ atomic_set(&using_sysemu, value);
+}
+
+int get_using_sysemu(void)
+{
+ return atomic_read(&using_sysemu);
+}
+
+static int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int *eof, void *data)
+{
+ if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size) /*No overflow*/
+ *eof = 1;
+
+ return strlen(buf);
+}
+
+static int proc_write_sysemu(struct file *file,const char __user *buf, unsigned long count,void *data)
+{
+ char tmp[2];
+
+ if (copy_from_user(tmp, buf, 1))
+ return -EFAULT;
+
+ if (tmp[0] >= '0' && tmp[0] <= '2')
+ set_using_sysemu(tmp[0] - '0');
+ return count; /*We use the first char, but pretend to write everything*/
+}
+
+int __init make_proc_sysemu(void)
+{
+ struct proc_dir_entry *ent;
+ if (!sysemu_supported)
+ return 0;
+
+ ent = create_proc_entry("sysemu", 0600, &proc_root);
+
+ if (ent == NULL)
+ {
+ printk(KERN_WARNING "Failed to register /proc/sysemu\n");
+ return(0);
+ }
+
+ ent->read_proc = proc_read_sysemu;
+ ent->write_proc = proc_write_sysemu;
+
+ return 0;
+}
+
+late_initcall(make_proc_sysemu);
+
+int singlestepping(void * t)
{
- return(current->thread_info->cpu);
+ struct task_struct *task = t ? t : current;
+
+ if ( ! (task->ptrace & PT_DTRACE) )
+ return(0);
+
+ if (task->thread.singlestep_syscall)
+ return(1);
+
+ return 2;
}
/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
+ * Only x86 and x86_64 have an arch_align_stack().
+ * All other arches have "#define arch_align_stack(x) (x)"
+ * in their asm/system.h
+ * As this is included in UML from asm-um/system-generic.h,
+ * we can use it to behave as the subarch does.
*/
+#ifndef arch_align_stack
+unsigned long arch_align_stack(unsigned long sp)
+{
+ if (randomize_va_space)
+ sp -= get_random_int() % 8192;
+ return sp & ~0xf;
+}
+#endif
git://git.onelab.eu / linux-2.6.git / blobdiff