1 files changed, 483 insertions, 0 deletions

diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
new file mode 100644
index 000000000000..fe6c64abda5b
--- /dev/null
+++ b/arch/um/kernel/process.c
@@ -0,0 +1,483 @@
+/*
+ * 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/fs.h"
+#include "linux/utime.h"
+#include "linux/smp_lock.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 "linux/personality.h"
+#include "asm/unistd.h"
+#include "asm/mman.h"
+#include "asm/segment.h"
+#include "asm/stat.h"
+#include "asm/pgtable.h"
+#include "asm/processor.h"
+#include "asm/tlbflush.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 "init.h"
+#include "irq_user.h"
+#include "mem_user.h"
+#include "tlb.h"
+#include "frame_kern.h"
+#include "sigcontext.h"
+#include "os.h"
+#include "mode.h"
+#include "mode_kern.h"
+#include "choose-mode.h"
+
+/* This is a per-cpu array.  A processor only modifies its entry and it only
+ * cares about its entry, so it's OK if another processor is modifying its
+ * entry.
+ */
+struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } };
+
+int external_pid(void *t)
+{
+        struct task_struct *task = t ? t : current;
+
+        return(CHOOSE_MODE_PROC(external_pid_tt, external_pid_skas, task));
+}
+
+int pid_to_processor_id(int pid)
+{
+        int i;
+
+        for(i = 0; i < ncpus; i++){
+                if(cpu_tasks[i].pid == pid) return(i);
+        }
+        return(-1);
+}
+
+void free_stack(unsigned long stack, int order)
+{
+        free_pages(stack, order);
+}
+
+unsigned long alloc_stack(int order, int atomic)
+{
+        unsigned long page;
+        gfp_t flags = GFP_KERNEL;
+
+        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)
+{
+        int pid;
+
+        current->thread.request.u.thread.proc = fn;
+        current->thread.request.u.thread.arg = arg;
+        pid = do_fork(CLONE_VM | CLONE_UNTRACED | flags, 0,
+                      &current->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(task)->cpu] = ((struct cpu_task)
+                { external_pid(task), task });
+}
+
+void *_switch_to(void *prev, void *next, void *last)
+{
+        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();
+}
+
+void release_thread(struct task_struct *task)
+{
+        CHOOSE_MODE(release_thread_tt(task), release_thread_skas(task));
+}
+
+void exit_thread(void)
+{
+        unprotect_stack((unsigned long) current_thread);
+}
+
+void *get_current(void)
+{
+        return(current);
+}
+
+int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
+                unsigned long stack_top, struct task_struct * p,
+                struct pt_regs *regs)
+{
+        int ret;
+
+        p->thread = (struct thread_struct) INIT_THREAD;
+        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)
+{
+        int save_kmalloc_ok = kmalloc_ok;
+
+        kmalloc_ok = 0;
+        CHOOSE_MODE_PROC(initial_thread_cb_tt, initial_thread_cb_skas, proc,
+                         arg);
+        kmalloc_ok = save_kmalloc_ok;
+}
+
+unsigned long stack_sp(unsigned long page)
+{
+        return(page + PAGE_SIZE - sizeof(void *));
+}
+
+int current_pid(void)
+{
+        return(current->pid);
+}
+
+void default_idle(void)
+{
+        CHOOSE_MODE(uml_idle_timer(), (void) 0);
+
+        while(1){
+                /* endless idle loop with no priority at all */
+
+                /*
+                 * although we are an idle CPU, we do not want to
+                 * get into the scheduler unnecessarily.
+                 */
+                if(need_resched())
+                        schedule();
+
+                idle_sleep(10);
+        }
+}
+
+void cpu_idle(void)
+{
+        CHOOSE_MODE(init_idle_tt(), init_idle_skas());
+}
+
+int page_size(void)
+{
+        return(PAGE_SIZE);
+}
+
+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);
+        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);
+        ptent = *pte;
+        if(!pte_present(ptent))
+                return(ERR_PTR(-EINVAL));
+
+        if(pte_out != NULL)
+                *pte_out = ptent;
+        return((void *) (pte_val(ptent) & PAGE_MASK) + (addr & ~PAGE_MASK));
+}
+
+char *current_cmd(void)
+{
+#if defined(CONFIG_SMP) || defined(CONFIG_HIGHMEM)
+        return("(Unknown)");
+#else
+        void *addr = um_virt_to_phys(current, current->mm->arg_start, NULL);
+        return IS_ERR(addr) ? "(Unknown)": __va((unsigned long) addr);
+#endif
+}
+
+void force_sigbus(void)
+{
+        printk(KERN_ERR "Killing pid %d because of a lack of memory\n",
+               current->pid);
+        lock_kernel();
+        sigaddset(&current->pending.signal, SIGBUS);
+        recalc_sigpending();
+        current->flags |= PF_SIGNALED;
+        do_exit(SIGBUS | 0x80);
+}
+
+void dump_thread(struct pt_regs *regs, struct user *u)
+{
+}
+
+void enable_hlt(void)
+{
+        panic("enable_hlt");
+}
+
+EXPORT_SYMBOL(enable_hlt);
+
+void disable_hlt(void)
+{
+        panic("disable_hlt");
+}
+
+EXPORT_SYMBOL(disable_hlt);
+
+void *um_kmalloc(int size)
+{
+        return kmalloc(size, GFP_KERNEL);
+}
+
+void *um_kmalloc_atomic(int size)
+{
+        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)
+{
+        return((unsigned long) current->thread.fault_addr);
+}
+
+EXPORT_SYMBOL(get_fault_addr);
+
+void not_implemented(void)
+{
+        printk(KERN_DEBUG "Something isn't implemented in here\n");
+}
+
+EXPORT_SYMBOL(not_implemented);
+
+int user_context(unsigned long sp)
+{
+        unsigned long stack;
+
+        stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
+        return(stack != (unsigned long) current_thread);
+}
+
+extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end;
+
+void do_uml_exitcalls(void)
+{
+        exitcall_t *call;
+
+        call = &__uml_exitcall_end;
+        while (--call >= &__uml_exitcall_begin)
+                (*call)();
+}
+
+char *uml_strdup(char *string)
+{
+        return kstrdup(string, GFP_KERNEL);
+}
+
+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 __user *from, int size)
+{
+        return(copy_from_user(to, from, 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->cpu;
+        IPI_handler(cpu);
+        if(cpu != 0)
+                return(1);
+#endif
+        return(0);
+}
+
+int cpu(void)
+{
+        return(current_thread->cpu);
+}
+
+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)
+{
+        struct task_struct *task = t ? t : current;
+
+        if ( ! (task->ptrace & PT_DTRACE) )
+                return(0);
+
+        if (task->thread.singlestep_syscall)
+                return(1);
+
+        return 2;
+}
+
+/*
+ * 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 (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
+                sp -= get_random_int() % 8192;
+        return sp & ~0xf;
+}
+#endif