[PATCH] uml: separate libc-dependent uaccess code

The serial UML OS-abstraction layer patch (um/kernel dir).

This moves all systemcalls from uaccess_user.c file under os-Linux dir
Signed-off-by: Gennady Sharapov <Gennady.V.Sharapov@intel.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/include/os.h

@@ -199,6 +199,12 @@ extern void forward_pending_sigio(int target);
 extern int start_fork_tramp(void *arg, unsigned long temp_stack,
 			    int clone_flags, int (*tramp)(void *));
 
+/* uaccess.c */
+extern unsigned long __do_user_copy(void *to, const void *from, int n,
+				    void **fault_addr, void **fault_catcher,
+				    void (*op)(void *to, const void *from,
+					       int n), int *faulted_out);
+
 #endif
 
 /*

arch/um/include/uml_uaccess.h

@@ -8,10 +8,6 @@
 
 extern int __do_copy_to_user(void *to, const void *from, int n,
 			     void **fault_addr, void **fault_catcher);
-extern unsigned long __do_user_copy(void *to, const void *from, int n,
-				    void **fault_addr, void **fault_catcher,
-				    void (*op)(void *to, const void *from,
-					       int n), int *faulted_out);
 void __do_copy(void *to, const void *from, int n);
 
 #endif

arch/um/kernel/Makefile

@@ -10,7 +10,7 @@ obj-y = config.o exec_kern.o exitcode.o \
 	helper.o init_task.o irq.o irq_user.o ksyms.o main.o mem.o physmem.o \
 	process_kern.o ptrace.o reboot.o resource.o sigio_user.o sigio_kern.o \
 	signal_kern.o signal_user.o smp.o syscall_kern.o sysrq.o time.o \
-	time_kern.o tlb.o trap_kern.o trap_user.o uaccess_user.o um_arch.o \
+	time_kern.o tlb.o trap_kern.o trap_user.o uaccess.o um_arch.o \
 	umid.o user_util.o
 
 obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o

arch/um/kernel/tt/uaccess_user.c

@@ -10,6 +10,7 @@
 #include "uml_uaccess.h"
 #include "task.h"
 #include "kern_util.h"
+#include "os.h"
 
 int __do_copy_from_user(void *to, const void *from, int n,
 			void **fault_addr, void **fault_catcher)

arch/um/kernel/uaccess_user.c → arch/um/kernel/uaccess.c

@@ -4,35 +4,12 @@
  * Licensed under the GPL
  */
 
-#include <setjmp.h>
-#include <string.h>
-
 /* These are here rather than tt/uaccess.c because skas mode needs them in
  * order to do SIGBUS recovery when a tmpfs mount runs out of room.
  */
 
-unsigned long __do_user_copy(void *to, const void *from, int n,
-			     void **fault_addr, void **fault_catcher,
-			     void (*op)(void *to, const void *from,
-					int n), int *faulted_out)
-{
-	unsigned long *faddrp = (unsigned long *) fault_addr, ret;
-
-	sigjmp_buf jbuf;
-	*fault_catcher = &jbuf;
-	if(sigsetjmp(jbuf, 1) == 0){
-		(*op)(to, from, n);
-		ret = 0;
-		*faulted_out = 0;
-	} 
-	else {
-		ret = *faddrp;
-		*faulted_out = 1;
-	}
-	*fault_addr = NULL;
-	*fault_catcher = NULL;
-	return ret;
-}
+#include <linux/string.h>
+#include "os.h"
 
 void __do_copy(void *to, const void *from, int n)
 {
@@ -51,14 +28,3 @@ int __do_copy_to_user(void *to, const void *from, int n,
 	if(!faulted) return(0);
 	else return(n - (fault - (unsigned long) to));
 }
-
-/*
- * 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:
- */

arch/um/os-Linux/Makefile

@@ -4,10 +4,10 @@
 #
 
 obj-y = aio.o elf_aux.o file.o mem.o process.o signal.o start_up.o time.o \
-	tt.o tty.o user_syms.o drivers/ sys-$(SUBARCH)/
+	tt.o tty.o uaccess.o user_syms.o drivers/ sys-$(SUBARCH)/
 
 USER_OBJS := aio.o elf_aux.o file.o mem.o process.o signal.o start_up.o \
-	time.o tt.o tty.o
+	time.o tt.o tty.o uaccess.o
 
 elf_aux.o: $(ARCH_DIR)/kernel-offsets.h
 CFLAGS_elf_aux.o += -I$(objtree)/arch/um

arch/um/os-Linux/uaccess.c

+/*
+ * Copyright (C) 2001 Chris Emerson (cemerson@chiark.greenend.org.uk)
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <setjmp.h>
+#include <string.h>
+
+unsigned long __do_user_copy(void *to, const void *from, int n,
+			     void **fault_addr, void **fault_catcher,
+			     void (*op)(void *to, const void *from,
+					int n), int *faulted_out)
+{
+	unsigned long *faddrp = (unsigned long *) fault_addr, ret;
+
+	sigjmp_buf jbuf;
+	*fault_catcher = &jbuf;
+	if(sigsetjmp(jbuf, 1) == 0){
+		(*op)(to, from, n);
+		ret = 0;
+		*faulted_out = 0;
+	}
+	else {
+		ret = *faddrp;
+		*faulted_out = 1;
+	}
+	*fault_addr = NULL;
+	*fault_catcher = NULL;
+	return ret;
+}
+