linux/arch/avr32/lib/strnlen_user.S
Haavard Skinnemoen 5f97f7f940 [PATCH] avr32 architecture
This adds support for the Atmel AVR32 architecture as well as the AT32AP7000
CPU and the AT32STK1000 development board.

AVR32 is a new high-performance 32-bit RISC microprocessor core, designed for
cost-sensitive embedded applications, with particular emphasis on low power
consumption and high code density.  The AVR32 architecture is not binary
compatible with earlier 8-bit AVR architectures.

The AVR32 architecture, including the instruction set, is described by the
AVR32 Architecture Manual, available from

http://www.atmel.com/dyn/resources/prod_documents/doc32000.pdf

The Atmel AT32AP7000 is the first CPU implementing the AVR32 architecture.  It
features a 7-stage pipeline, 16KB instruction and data caches and a full
Memory Management Unit.  It also comes with a large set of integrated
peripherals, many of which are shared with the AT91 ARM-based controllers from
Atmel.

Full data sheet is available from

http://www.atmel.com/dyn/resources/prod_documents/doc32003.pdf

while the CPU core implementation including caches and MMU is documented by
the AVR32 AP Technical Reference, available from

http://www.atmel.com/dyn/resources/prod_documents/doc32001.pdf

Information about the AT32STK1000 development board can be found at

http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3918

including a BSP CD image with an earlier version of this patch, development
tools (binaries and source/patches) and a root filesystem image suitable for
booting from SD card.

Alternatively, there's a preliminary "getting started" guide available at
http://avr32linux.org/twiki/bin/view/Main/GettingStarted which provides links
to the sources and patches you will need in order to set up a cross-compiling
environment for avr32-linux.

This patch, as well as the other patches included with the BSP and the
toolchain patches, is actively supported by Atmel Corporation.

[dmccr@us.ibm.com: Fix more pxx_page macro locations]
[bunk@stusta.de: fix `make defconfig']
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Dave McCracken <dmccr@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-09-26 08:48:54 -07:00

68 lines
1.2 KiB
ArmAsm

/*
* Copy to/from userspace with optional address space checking.
*
* Copyright 2004-2006 Atmel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <asm/page.h>
#include <asm/thread_info.h>
#include <asm/processor.h>
#include <asm/asm.h>
.text
.align 1
.global strnlen_user
.type strnlen_user, "function"
strnlen_user:
branch_if_kernel r8, __strnlen_user
sub r8, r11, 1
add r8, r12
retcs 0
brmi adjust_length /* do a closer inspection */
.global __strnlen_user
.type __strnlen_user, "function"
__strnlen_user:
mov r10, r12
10: ld.ub r8, r12++
cp.w r8, 0
breq 2f
sub r11, 1
brne 10b
sub r12, -1
2: sub r12, r10
retal r12
.type adjust_length, "function"
adjust_length:
cp.w r12, 0 /* addr must always be < TASK_SIZE */
retmi 0
pushm lr
lddpc lr, _task_size
sub r11, lr, r12
mov r9, r11
rcall __strnlen_user
cp.w r12, r9
brgt 1f
popm pc
1: popm pc, r12=0
.align 2
_task_size:
.long TASK_SIZE
.section .fixup, "ax"
.align 1
19: retal 0
.section __ex_table, "a"
.align 2
.long 10b, 19b