This commit was manufactured by cvs2svn to create tag

[linux-2.6.git] / arch / um / kernel / skas / process_kern.c

diff --git a/arch/um/kernel/skas/process_kern.c b/arch/um/kernel/skas/process_kern.c
index b0c53a4..5418f08 100644 (file)
--- a/arch/um/kernel/skas/process_kern.c
+++ b/arch/um/kernel/skas/process_kern.c
@@ -24,6 +24,69 @@
 #include "mode.h"
 #include "proc_mm.h"
 
+static atomic_t using_sysemu;
+int sysemu_supported;
+
+void set_using_sysemu(int value)
+{
+       atomic_set(&using_sysemu, sysemu_supported && value);
+}
+
+int get_using_sysemu(void)
+{
+       return atomic_read(&using_sysemu);
+}
+
+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);
+}
+
+int proc_write_sysemu(struct file *file,const char *buf, unsigned long count,void *data)
+{
+       char tmp[2];
+
+       if (copy_from_user(tmp, buf, 1))
+               return -EFAULT;
+
+       if (tmp[0] == '0' || tmp[0] == '1')
+               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 (mode_tt || !sysemu_supported)
+               return 0;
+
+       ent = create_proc_entry("sysemu", 0600, &proc_root);
+
+       if (ent == NULL)
+       {
+               printk("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_skas(void)
+{
+       int ret = current->ptrace & PT_DTRACE;
+
+       current->ptrace &= ~PT_DTRACE;
+       return(ret);
+}
+
 void *switch_to_skas(void *prev, void *next)
 {
        struct task_struct *from, *to;