1 files changed, 98 insertions, 0 deletions
diff --git a/arch/um/kernel/tt/uaccess_user.c b/arch/um/kernel/tt/uaccess_user.c
new file mode 100644
index 00000000000..f01475512ec
--- /dev/null
+++ b/arch/um/kernel/tt/uaccess_user.c
@@ -0,0 +1,98 @@
+/* 
+ * Copyright (C) 2001 Chris Emerson (cemerson@chiark.greenend.org.uk)
+ * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <setjmp.h>
+#include <string.h>
+#include "user_util.h"
+#include "uml_uaccess.h"
+#include "task.h"
+#include "kern_util.h"
+
+int __do_copy_from_user(void *to, const void *from, int n,
+			void **fault_addr, void **fault_catcher)
+{
+	struct tt_regs save = TASK_REGS(get_current())->tt;
+	unsigned long fault;
+	int faulted;
+
+	fault = __do_user_copy(to, from, n, fault_addr, fault_catcher,
+			       __do_copy, &faulted);
+	TASK_REGS(get_current())->tt = save;
+
+	if(!faulted) return(0);
+	else return(n - (fault - (unsigned long) from));
+}
+
+static void __do_strncpy(void *dst, const void *src, int count)
+{
+	strncpy(dst, src, count);
+}	
+
+int __do_strncpy_from_user(char *dst, const char *src, unsigned long count,
+			   void **fault_addr, void **fault_catcher)
+{
+	struct tt_regs save = TASK_REGS(get_current())->tt;
+	unsigned long fault;
+	int faulted;
+
+	fault = __do_user_copy(dst, src, count, fault_addr, fault_catcher,
+			       __do_strncpy, &faulted);
+	TASK_REGS(get_current())->tt = save;
+
+	if(!faulted) return(strlen(dst));
+	else return(-1);
+}
+
+static void __do_clear(void *to, const void *from, int n)
+{
+	memset(to, 0, n);
+}	
+
+int __do_clear_user(void *mem, unsigned long len,
+		    void **fault_addr, void **fault_catcher)
+{
+	struct tt_regs save = TASK_REGS(get_current())->tt;
+	unsigned long fault;
+	int faulted;
+
+	fault = __do_user_copy(mem, NULL, len, fault_addr, fault_catcher,
+			       __do_clear, &faulted);
+	TASK_REGS(get_current())->tt = save;
+
+	if(!faulted) return(0);
+	else return(len - (fault - (unsigned long) mem));
+}
+
+int __do_strnlen_user(const char *str, unsigned long n,
+		      void **fault_addr, void **fault_catcher)
+{
+	struct tt_regs save = TASK_REGS(get_current())->tt;
+	int ret;
+	unsigned long *faddrp = (unsigned long *)fault_addr;
+	sigjmp_buf jbuf;
+
+	*fault_catcher = &jbuf;
+	if(sigsetjmp(jbuf, 1) == 0)
+		ret = strlen(str) + 1;
+	else ret = *faddrp - (unsigned long) str;
+
+	*fault_addr = NULL;
+	*fault_catcher = NULL;
+
+	TASK_REGS(get_current())->tt = save;
+	return ret;
+}
+
+/*
+ * 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:
+ */