/* * 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 call __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