linux/arch/mips/lib/strncpy_user.S
Ralf Baechle c5ec1983e4 [MIPS] Eleminate local symbols from the symbol table.
These symbols appear in oprofile output, stacktraces and similar but only
make the output harder to read.  Many identical symbol names such as
"both_aligned" were also being used in multiple source files making it
impossible to see which file actually was meant.  So let's get rid of them.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-01-29 10:14:59 +00:00

60 lines
1.3 KiB
ArmAsm

/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (c) 1996, 1999 by Ralf Baechle
*/
#include <linux/errno.h>
#include <asm/asm.h>
#include <asm/asm-offsets.h>
#include <asm/regdef.h>
#define EX(insn,reg,addr,handler) \
9: insn reg, addr; \
.section __ex_table,"a"; \
PTR 9b, handler; \
.previous
/*
* Returns: -EFAULT if exception before terminator, N if the entire
* buffer filled, else strlen.
*/
/*
* Ugly special case have to check: we might get passed a user space
* pointer which wraps into the kernel space. We don't deal with that. If
* it happens at most some bytes of the exceptions handlers will be copied.
*/
LEAF(__strncpy_from_user_asm)
LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok?
and v0, a1
bnez v0, .Lfault
FEXPORT(__strncpy_from_user_nocheck_asm)
move v0, zero
move v1, a1
.set noreorder
1: EX(lbu, t0, (v1), .Lfault)
PTR_ADDIU v1, 1
R10KCBARRIER(0(ra))
beqz t0, 2f
sb t0, (a0)
PTR_ADDIU v0, 1
.set reorder
PTR_ADDIU a0, 1
bne v0, a2, 1b
2: PTR_ADDU t0, a1, v0
xor t0, a1
bltz t0, .Lfault
jr ra # return n
END(__strncpy_from_user_asm)
.Lfault: li v0, -EFAULT
jr ra
.section __ex_table,"a"
PTR 1b, .Lfault
.previous