154 lines
5.0 KiB
C
154 lines
5.0 KiB
C
/*
|
|
* linux/include/asm-arm/proc-armo/uaccess.h
|
|
*
|
|
* Copyright (C) 1996 Russell King
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* The fs functions are implemented on the ARM2 and ARM3 architectures
|
|
* manually.
|
|
* Use *_user functions to access user memory with faulting behaving
|
|
* as though the user is accessing the memory.
|
|
* Use set_fs(get_ds()) and then the *_user functions to allow them to
|
|
* access kernel memory.
|
|
*/
|
|
|
|
/*
|
|
* These are the values used to represent the user `fs' and the kernel `ds'
|
|
* FIXME - the KERNEL_DS should end at 0x03000000 but we want to access ROM at
|
|
* 0x03400000. ideally we want to forbid access to the IO space inbetween.
|
|
*/
|
|
#define KERNEL_DS 0x03FFFFFF
|
|
#define USER_DS 0x02000000
|
|
|
|
extern uaccess_t uaccess_user, uaccess_kernel;
|
|
|
|
static inline void set_fs (mm_segment_t fs)
|
|
{
|
|
current_thread_info()->addr_limit = fs;
|
|
current->thread.uaccess = (fs == USER_DS ? &uaccess_user : &uaccess_kernel);
|
|
}
|
|
|
|
#define __range_ok(addr,size) ({ \
|
|
unsigned long flag, sum; \
|
|
__asm__ __volatile__("subs %1, %0, %3; cmpcs %1, %2; movcs %0, #0" \
|
|
: "=&r" (flag), "=&r" (sum) \
|
|
: "r" (addr), "Ir" (size), "0" (current_thread_info()->addr_limit) \
|
|
: "cc"); \
|
|
flag; })
|
|
|
|
#define __addr_ok(addr) ({ \
|
|
unsigned long flag; \
|
|
__asm__ __volatile__("cmp %2, %0; movlo %0, #0" \
|
|
: "=&r" (flag) \
|
|
: "0" (current_thread_info()->addr_limit), "r" (addr) \
|
|
: "cc"); \
|
|
(flag == 0); })
|
|
|
|
#define __put_user_asm_byte(x,addr,err) \
|
|
__asm__ __volatile__( \
|
|
" mov r0, %1\n" \
|
|
" mov r1, %2\n" \
|
|
" mov r2, %0\n" \
|
|
" mov lr, pc\n" \
|
|
" mov pc, %3\n" \
|
|
" mov %0, r2\n" \
|
|
: "=r" (err) \
|
|
: "r" (x), "r" (addr), "r" (current->thread.uaccess->put_byte), \
|
|
"0" (err) \
|
|
: "r0", "r1", "r2", "lr")
|
|
|
|
#define __put_user_asm_half(x,addr,err) \
|
|
__asm__ __volatile__( \
|
|
" mov r0, %1\n" \
|
|
" mov r1, %2\n" \
|
|
" mov r2, %0\n" \
|
|
" mov lr, pc\n" \
|
|
" mov pc, %3\n" \
|
|
" mov %0, r2\n" \
|
|
: "=r" (err) \
|
|
: "r" (x), "r" (addr), "r" (current->thread.uaccess->put_half), \
|
|
"0" (err) \
|
|
: "r0", "r1", "r2", "lr")
|
|
|
|
#define __put_user_asm_word(x,addr,err) \
|
|
__asm__ __volatile__( \
|
|
" mov r0, %1\n" \
|
|
" mov r1, %2\n" \
|
|
" mov r2, %0\n" \
|
|
" mov lr, pc\n" \
|
|
" mov pc, %3\n" \
|
|
" mov %0, r2\n" \
|
|
: "=r" (err) \
|
|
: "r" (x), "r" (addr), "r" (current->thread.uaccess->put_word), \
|
|
"0" (err) \
|
|
: "r0", "r1", "r2", "lr")
|
|
|
|
#define __put_user_asm_dword(x,addr,err) \
|
|
__asm__ __volatile__( \
|
|
" mov r0, %1\n" \
|
|
" mov r1, %2\n" \
|
|
" mov r2, %0\n" \
|
|
" mov lr, pc\n" \
|
|
" mov pc, %3\n" \
|
|
" mov %0, r2\n" \
|
|
: "=r" (err) \
|
|
: "r" (x), "r" (addr), "r" (current->thread.uaccess->put_dword), \
|
|
"0" (err) \
|
|
: "r0", "r1", "r2", "lr")
|
|
|
|
#define __get_user_asm_byte(x,addr,err) \
|
|
__asm__ __volatile__( \
|
|
" mov r0, %2\n" \
|
|
" mov r1, %0\n" \
|
|
" mov lr, pc\n" \
|
|
" mov pc, %3\n" \
|
|
" mov %0, r1\n" \
|
|
" mov %1, r0\n" \
|
|
: "=r" (err), "=r" (x) \
|
|
: "r" (addr), "r" (current->thread.uaccess->get_byte), "0" (err) \
|
|
: "r0", "r1", "r2", "lr")
|
|
|
|
#define __get_user_asm_half(x,addr,err) \
|
|
__asm__ __volatile__( \
|
|
" mov r0, %2\n" \
|
|
" mov r1, %0\n" \
|
|
" mov lr, pc\n" \
|
|
" mov pc, %3\n" \
|
|
" mov %0, r1\n" \
|
|
" mov %1, r0\n" \
|
|
: "=r" (err), "=r" (x) \
|
|
: "r" (addr), "r" (current->thread.uaccess->get_half), "0" (err) \
|
|
: "r0", "r1", "r2", "lr")
|
|
|
|
#define __get_user_asm_word(x,addr,err) \
|
|
__asm__ __volatile__( \
|
|
" mov r0, %2\n" \
|
|
" mov r1, %0\n" \
|
|
" mov lr, pc\n" \
|
|
" mov pc, %3\n" \
|
|
" mov %0, r1\n" \
|
|
" mov %1, r0\n" \
|
|
: "=r" (err), "=r" (x) \
|
|
: "r" (addr), "r" (current->thread.uaccess->get_word), "0" (err) \
|
|
: "r0", "r1", "r2", "lr")
|
|
|
|
#define __do_copy_from_user(to,from,n) \
|
|
(n) = current->thread.uaccess->copy_from_user((to),(from),(n))
|
|
|
|
#define __do_copy_to_user(to,from,n) \
|
|
(n) = current->thread.uaccess->copy_to_user((to),(from),(n))
|
|
|
|
#define __do_clear_user(addr,sz) \
|
|
(sz) = current->thread.uaccess->clear_user((addr),(sz))
|
|
|
|
#define __do_strncpy_from_user(dst,src,count,res) \
|
|
(res) = current->thread.uaccess->strncpy_from_user(dst,src,count)
|
|
|
|
#define __do_strnlen_user(s,n,res) \
|
|
(res) = current->thread.uaccess->strnlen_user(s,n)
|