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linux-next/arch/cris/arch-v10/lib/csumcpfruser.S
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

65 lines
1.6 KiB
ArmAsm

/*
* Add-on to transform csum_partial_copy_nocheck in checksumcopy.S into
* csum_partial_copy_from_user by adding exception records.
*
* Copyright (C) 2001 Axis Communications AB.
*
* Author: Hans-Peter Nilsson.
*/
#include <asm/errno.h>
/* Same function body, but a different name. If we just added exception
records to _csum_partial_copy_nocheck and made it generic, we wouldn't
know a user fault from a kernel fault and we would have overhead in
each kernel caller for the error-pointer argument.
unsigned int csum_partial_copy_from_user
(const char *src, char *dst, int len, unsigned int sum, int *errptr);
Note that the errptr argument is only set if we encounter an error.
It is conveniently located on the stack, so the normal function body
does not have to handle it. */
#define csum_partial_copy_nocheck csum_partial_copy_from_user
/* There are local labels numbered 1, 2 and 3 present to mark the
different from-user accesses. */
#include "checksumcopy.S"
.section .fixup,"ax"
;; Here from the movem loop; restore stack.
4:
movem [$sp+],$r8
;; r12 is already decremented. Add back chunk_size-2.
addq 40-2,$r12
;; Here from the word loop; r12 is off by 2; add it back.
5:
addq 2,$r12
;; Here from a failing single byte.
6:
;; Signal in *errptr that we had a failing access.
moveq -EFAULT,$r9
move.d $r9,[[$sp]]
;; Clear the rest of the destination area using memset. Preserve the
;; checksum for the readable bytes.
push $srp
push $r13
move.d $r11,$r10
clear.d $r11
jsr memset
pop $r10
jump [$sp+]
.previous
.section __ex_table,"a"
.dword 1b,4b
.dword 2b,5b
.dword 3b,6b
.previous