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1276 |
phoenix |
/*
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* linux/include/asm-arm/proc-armo/segment.h
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*
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* Copyright (C) 1996 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/*
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* The fs functions are implemented on the ARM2 and ARM3 architectures
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* manually.
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* Use *_user functions to access user memory with faulting behaving
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* as though the user is accessing the memory.
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* Use set_fs(get_ds()) and then the *_user functions to allow them to
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* access kernel memory.
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*/
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/*
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* These are the values used to represent the user `fs' and the kernel `ds'
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*/
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#define KERNEL_DS 0x03000000
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#define USER_DS 0x02000000
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extern uaccess_t uaccess_user, uaccess_kernel;
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static inline void set_fs (mm_segment_t fs)
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{
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current->addr_limit = fs;
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current->thread.uaccess = fs == USER_DS ? &uaccess_user : &uaccess_kernel;
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}
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#define __range_ok(addr,size) ({ \
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unsigned long flag, sum; \
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__asm__ __volatile__("subs %1, %0, %3; cmpcs %1, %2; movcs %0, #0" \
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: "=&r" (flag), "=&r" (sum) \
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: "r" (addr), "Ir" (size), "0" (current->addr_limit) \
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: "cc"); \
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flag; })
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#define __addr_ok(addr) ({ \
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unsigned long flag; \
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__asm__ __volatile__("cmp %2, %0; movlo %0, #0" \
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: "=&r" (flag) \
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: "0" (current->addr_limit), "r" (addr) \
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: "cc"); \
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(flag == 0); })
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#define __put_user_asm_byte(x,addr,err) \
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__asm__ __volatile__( \
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" mov r0, %1\n" \
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" mov r1, %2\n" \
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" mov r2, %0\n" \
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" mov lr, pc\n" \
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" mov pc, %3\n" \
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" mov %0, r2\n" \
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: "=r" (err) \
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: "r" (x), "r" (addr), "r" (current->thread.uaccess->put_byte), \
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"0" (err) \
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: "r0", "r1", "r2", "lr")
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#define __put_user_asm_half(x,addr,err) \
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__asm__ __volatile__( \
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" mov r0, %1\n" \
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" mov r1, %2\n" \
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" mov r2, %0\n" \
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" mov lr, pc\n" \
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" mov pc, %3\n" \
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" mov %0, r2\n" \
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: "=r" (err) \
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: "r" (x), "r" (addr), "r" (current->thread.uaccess->put_half), \
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"0" (err) \
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: "r0", "r1", "r2", "lr")
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#define __put_user_asm_word(x,addr,err) \
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__asm__ __volatile__( \
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" mov r0, %1\n" \
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" mov r1, %2\n" \
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" mov r2, %0\n" \
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" mov lr, pc\n" \
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" mov pc, %3\n" \
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" mov %0, r2\n" \
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: "=r" (err) \
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: "r" (x), "r" (addr), "r" (current->thread.uaccess->put_word), \
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"0" (err) \
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: "r0", "r1", "r2", "lr")
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#define __get_user_asm_byte(x,addr,err) \
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__asm__ __volatile__( \
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" mov r0, %2\n" \
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" mov r1, %0\n" \
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" mov lr, pc\n" \
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" mov pc, %3\n" \
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" mov %0, r1\n" \
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" mov %1, r0\n" \
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: "=r" (err), "=r" (x) \
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: "r" (addr), "r" (current->thread.uaccess->get_byte), "0" (err) \
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: "r0", "r1", "r2", "lr")
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#define __get_user_asm_half(x,addr,err) \
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__asm__ __volatile__( \
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" mov r0, %2\n" \
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" mov r1, %0\n" \
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" mov lr, pc\n" \
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" mov pc, %3\n" \
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" mov %0, r1\n" \
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" mov %1, r0\n" \
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: "=r" (err), "=r" (x) \
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: "r" (addr), "r" (current->thread.uaccess->get_half), "0" (err) \
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: "r0", "r1", "r2", "lr")
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#define __get_user_asm_word(x,addr,err) \
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__asm__ __volatile__( \
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" mov r0, %2\n" \
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" mov r1, %0\n" \
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" mov lr, pc\n" \
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" mov pc, %3\n" \
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" mov %0, r1\n" \
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" mov %1, r0\n" \
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: "=r" (err), "=r" (x) \
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: "r" (addr), "r" (current->thread.uaccess->get_word), "0" (err) \
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: "r0", "r1", "r2", "lr")
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#define __do_copy_from_user(to,from,n) \
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(n) = current->thread.uaccess->copy_from_user((to),(from),(n))
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#define __do_copy_to_user(to,from,n) \
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(n) = current->thread.uaccess->copy_to_user((to),(from),(n))
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#define __do_clear_user(addr,sz) \
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(sz) = current->thread.uaccess->clear_user((addr),(sz))
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#define __do_strncpy_from_user(dst,src,count,res) \
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(res) = current->thread.uaccess->strncpy_from_user(dst,src,count)
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#define __do_strnlen_user(s,n,res) \
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(res) = current->thread.uaccess->strnlen_user(s,n)
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