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linux-next/arch/sparc/lib/user_fixup.c
Sam Ravnborg 917c3660d6 sparc64: move EXPORT_SYMBOL to the symbols definition
Move all applicable EXPORT_SYMBOL()s to the file where the respective
symbol is defined.

Removed all the includes that are no longer needed in sparc_ksyms_64.c

Comment all remaining EXPORT_SYMBOL()s in sparc_ksyms_64.c

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

Additions by Julian Calaby:
* Moved EXPORT_SYMBOL()s for prom functions to their rightful places.
* Made some minor cleanups to the includes and comments of sparc_ksyms_64.c
* Updated and tidied commit message.
* Rebased patch over sparc-2.6.git HEAD.
* Ensured that all modified files have the correct includes.

Signed-off-by: Julian Calaby <julian.calaby@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-08 16:58:20 -08:00

72 lines
1.8 KiB
C

/* user_fixup.c: Fix up user copy faults.
*
* Copyright (C) 2004 David S. Miller <davem@redhat.com>
*/
#include <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <asm/uaccess.h>
/* Calculating the exact fault address when using
* block loads and stores can be very complicated.
*
* Instead of trying to be clever and handling all
* of the cases, just fix things up simply here.
*/
static unsigned long compute_size(unsigned long start, unsigned long size, unsigned long *offset)
{
unsigned long fault_addr = current_thread_info()->fault_address;
unsigned long end = start + size;
if (fault_addr < start || fault_addr >= end) {
*offset = 0;
} else {
*offset = fault_addr - start;
size = end - fault_addr;
}
return size;
}
unsigned long copy_from_user_fixup(void *to, const void __user *from, unsigned long size)
{
unsigned long offset;
size = compute_size((unsigned long) from, size, &offset);
if (likely(size))
memset(to + offset, 0, size);
return size;
}
EXPORT_SYMBOL(copy_from_user_fixup);
unsigned long copy_to_user_fixup(void __user *to, const void *from, unsigned long size)
{
unsigned long offset;
return compute_size((unsigned long) to, size, &offset);
}
EXPORT_SYMBOL(copy_to_user_fixup);
unsigned long copy_in_user_fixup(void __user *to, void __user *from, unsigned long size)
{
unsigned long fault_addr = current_thread_info()->fault_address;
unsigned long start = (unsigned long) to;
unsigned long end = start + size;
if (fault_addr >= start && fault_addr < end)
return end - fault_addr;
start = (unsigned long) from;
end = start + size;
if (fault_addr >= start && fault_addr < end)
return end - fault_addr;
return size;
}
EXPORT_SYMBOL(copy_in_user_fixup);