517 lines
13 KiB
C
Executable File
517 lines
13 KiB
C
Executable File
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1996, 1997, 1998, 1999, 2000 by Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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*/
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#ifndef _ASM_UACCESS_H
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#define _ASM_UACCESS_H
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#include <linux/errno.h>
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#include <linux/sched.h>
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#define STR(x) __STR(x)
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#define __STR(x) #x
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/*
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* The fs value determines whether argument validity checking should be
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* performed or not. If get_fs() == USER_DS, checking is performed, with
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* get_fs() == KERNEL_DS, checking is bypassed.
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*
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* For historical reasons, these macros are grossly misnamed.
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*/
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#define KERNEL_DS ((mm_segment_t) { (unsigned long) 0L })
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//#define USER_DS ((mm_segment_t) { (unsigned long) -1L })
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#define USER_DS ((mm_segment_t) { (unsigned long) 0L }) //lobo replace
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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#define get_fs() (current->thread.current_ds)
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#define get_ds() (KERNEL_DS)
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#define set_fs(x) (current->thread.current_ds=(x))
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#define segment_eq(a,b) ((a).seg == (b).seg)
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/*
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* Is a address valid? This does a straighforward calculation rather
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* than tests.
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*
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* Address valid if:
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* - "addr" doesn't have any high-bits set
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* - AND "size" doesn't have any high-bits set
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* - AND "addr+size" doesn't have any high-bits set
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* - OR we are in kernel mode.
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*/
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#define __ua_size(size) \
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(__builtin_constant_p(size) && (signed long) (size) > 0 ? 0 : (size))
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//lobo del this
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/*#define __access_ok(addr,size,mask) \
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(((signed long)((mask)&(addr | (addr + size) | __ua_size(size)))) >= 0)*/
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#define __access_ok(addr,size,mask) 1 // lobo add
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#define __access_mask ((long)(get_fs().seg))
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#define access_ok(type,addr,size) \
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__access_ok(((unsigned long)(addr)),(size),__access_mask)
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extern inline int verify_area(int type, const void * addr, unsigned long size)
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{
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return access_ok(type,addr,size) ? 0 : -EFAULT;
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}
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/*
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* Uh, these should become the main single-value transfer routines ...
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* They automatically use the right size if we just have the right
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* pointer type ...
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*
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* As MIPS uses the same address space for kernel and user data, we
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* can just do these as direct assignments.
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*
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* Careful to not
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* (a) re-use the arguments for side effects (sizeof is ok)
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* (b) require any knowledge of processes at this stage
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*/
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#define put_user(x,ptr) \
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__put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
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#define get_user(x,ptr) \
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__get_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
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/*
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* The "__xxx" versions do not do address space checking, useful when
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* doing multiple accesses to the same area (the user has to do the
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* checks by hand with "access_ok()")
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*/
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#define __put_user(x,ptr) \
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__put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
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#define __get_user(x,ptr) \
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__get_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
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struct __large_struct { unsigned long buf[100]; };
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#define __m(x) (*(struct __large_struct *)(x))
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/*
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* Yuck. We need two variants, one for 64bit operation and one
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* for 32 bit mode and old iron.
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*/
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#ifdef __mips64
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#define __GET_USER_DW __get_user_asm("ld")
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#else
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#define __GET_USER_DW __get_user_asm_ll32
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#endif
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/* lobo replace this */
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#define __get_user_nocheck(x,ptr,size) ({ \
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long __gu_err; \
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__typeof__(*(ptr)) __gu_val; \
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long __gu_addr; \
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__asm__("":"=r" (__gu_val)); \
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__gu_addr = (long) (ptr); \
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__asm__("":"=r" (__gu_err)); \
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switch (size) { \
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case 1: __get_user_asm("lb"); break; \
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case 2: __get_user_asm("lh"); break; \
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case 4: __get_user_asm("lw"); break; \
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case 8: __GET_USER_DW; break; \
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default: __get_user_unknown(); break; \
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} x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
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#define __get_user_check(x,ptr,size) ({ \
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long __gu_err; \
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__typeof__(*(ptr)) __gu_val; \
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long __gu_addr; \
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__asm__("":"=r" (__gu_val)); \
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__gu_addr = (long) (ptr); \
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__asm__("":"=r" (__gu_err)); \
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if (__access_ok(__gu_addr,size,__access_mask)) { \
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switch (size) { \
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case 1: __get_user_asm("lb"); break; \
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case 2: __get_user_asm("lh"); break; \
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case 4: __get_user_asm("lw"); break; \
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case 8: __GET_USER_DW; break; \
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default: __get_user_unknown(); break; \
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} } x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
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#define __get_user_asm(insn) \
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({ \
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__asm__ __volatile__( \
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"1:\t" insn "\t%1,%2\n\t" \
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"move\t%0,$0\n" \
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"2:\n\t" \
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".section\t.fixup,\"ax\"\n" \
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"3:\tli\t%0,%3\n\t" \
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"move\t%1,$0\n\t" \
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"j\t2b\n\t" \
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".previous\n\t" \
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".section\t__ex_table,\"a\"\n\t" \
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".word\t1b,3b\n\t" \
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".previous" \
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:"=r" (__gu_err), "=r" (__gu_val) \
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:"o" (__m(__gu_addr)), "i" (-EFAULT)); })
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/*
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* Get a long long 64 using 32 bit registers.
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*/
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#define __get_user_asm_ll32 \
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({ \
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__asm__ __volatile__( \
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"1:\tlw\t%1,%2\n" \
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"2:\tlw\t%D1,%3\n\t" \
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"move\t%0,$0\n" \
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"3:\t.section\t.fixup,\"ax\"\n" \
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"4:\tli\t%0,%4\n\t" \
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"move\t%1,$0\n\t" \
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"move\t%D1,$0\n\t" \
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"j\t3b\n\t" \
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".previous\n\t" \
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".section\t__ex_table,\"a\"\n\t" \
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".word\t1b,4b\n\t" \
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".word\t2b,4b\n\t" \
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".previous" \
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:"=r" (__gu_err), "=&r" (__gu_val) \
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:"o" (__m(__gu_addr)), "o" (__m(__gu_addr + 4)), \
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"i" (-EFAULT)); })
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extern void __get_user_unknown(void);
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/*
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* Yuck. We need two variants, one for 64bit operation and one
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* for 32 bit mode and old iron.
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*/
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#ifdef __mips64
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#define __PUT_USER_DW __put_user_asm("sd")
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#else
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#define __PUT_USER_DW __put_user_asm_ll32
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#endif
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#define __put_user_nocheck(x,ptr,size) ({ \
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long __pu_err; \
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__typeof__(*(ptr)) __pu_val; \
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long __pu_addr; \
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__pu_val = (x); \
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__pu_addr = (long) (ptr); \
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__asm__("":"=r" (__pu_err)); \
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switch (size) { \
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case 1: __put_user_asm("sb"); break; \
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case 2: __put_user_asm("sh"); break; \
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case 4: __put_user_asm("sw"); break; \
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case 8: __PUT_USER_DW; break; \
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default: __put_user_unknown(); break; \
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} __pu_err; })
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#define __put_user_check(x,ptr,size) ({ \
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long __pu_err; \
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__typeof__(*(ptr)) __pu_val; \
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long __pu_addr; \
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__pu_val = (x); \
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__pu_addr = (long) (ptr); \
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__asm__("":"=r" (__pu_err)); \
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if (__access_ok(__pu_addr,size,__access_mask)) { \
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switch (size) { \
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case 1: __put_user_asm("sb"); break; \
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case 2: __put_user_asm("sh"); break; \
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case 4: __put_user_asm("sw"); break; \
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case 8: __PUT_USER_DW; break; \
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default: __put_user_unknown(); break; \
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} } __pu_err; })
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#define __put_user_asm(insn) \
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({ \
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__asm__ __volatile__( \
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"1:\t" insn "\t%z1, %2\t\t\t# __put_user_asm\n\t" \
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"move\t%0, $0\n" \
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"2:\n\t" \
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".section\t.fixup,\"ax\"\n" \
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"3:\tli\t%0,%3\n\t" \
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"j\t2b\n\t" \
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".previous\n\t" \
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".section\t__ex_table,\"a\"\n\t" \
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".word\t1b,3b\n\t" \
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".previous" \
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:"=r" (__pu_err) \
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:"Jr" (__pu_val), "o" (__m(__pu_addr)), "i" (-EFAULT)); })
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#define __put_user_asm_ll32 \
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({ \
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__asm__ __volatile__( \
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"1:\tsw\t%1, %2\t\t\t# __put_user_asm_ll32\n\t" \
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"2:\tsw\t%D1, %3\n" \
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"move\t%0, $0\n" \
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"3:\n\t" \
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".section\t.fixup,\"ax\"\n" \
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"4:\tli\t%0,%4\n\t" \
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"j\t3b\n\t" \
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".previous\n\t" \
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".section\t__ex_table,\"a\"\n\t" \
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".word\t1b,4b\n\t" \
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".word\t2b,4b\n\t" \
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".previous" \
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:"=r" (__pu_err) \
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:"r" (__pu_val), "o" (__m(__pu_addr)), "o" (__m(__pu_addr + 4)), \
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"i" (-EFAULT)); })
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extern void __put_user_unknown(void);
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/*
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* We're generating jump to subroutines which will be outside the range of
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* jump instructions
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*/
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#ifdef MODULE
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#define __MODULE_JAL(destination) \
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".set\tnoat\n\t" \
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"la\t$1, " #destination "\n\t" \
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"jalr\t$1\n\t" \
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".set\tat\n\t"
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#else
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#define __MODULE_JAL(destination) \
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"jal\t" #destination "\n\t"
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#endif
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extern size_t __copy_user(void *__to, const void *__from, size_t __n);
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#define __copy_to_user(to,from,n) ({ \
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void *__cu_to; \
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const void *__cu_from; \
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long __cu_len; \
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\
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__cu_to = (to); \
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__cu_from = (from); \
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__cu_len = (n); \
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__asm__ __volatile__( \
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"move\t$4, %1\n\t" \
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"move\t$5, %2\n\t" \
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"move\t$6, %3\n\t" \
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__MODULE_JAL(__copy_user) \
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"move\t%0, $6" \
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: "=r" (__cu_len) \
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: "r" (__cu_to), "r" (__cu_from), "r" (__cu_len) \
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: "$4", "$5", "$6", "$8", "$9", "$10", "$11", "$12", "$15", \
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"$24", "$31","memory"); \
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__cu_len; \
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})
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#define __copy_from_user(to,from,n) ({ \
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void *__cu_to; \
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const void *__cu_from; \
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long __cu_len; \
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\
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__cu_to = (to); \
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__cu_from = (from); \
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__cu_len = (n); \
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__asm__ __volatile__( \
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"move\t$4, %1\n\t" \
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"move\t$5, %2\n\t" \
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"move\t$6, %3\n\t" \
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".set\tnoreorder\n\t" \
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__MODULE_JAL(__copy_user) \
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".set\tnoat\n\t" \
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"addu\t$1, %2, %3\n\t" \
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".set\tat\n\t" \
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".set\treorder\n\t" \
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"move\t%0, $6" \
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: "=r" (__cu_len) \
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: "r" (__cu_to), "r" (__cu_from), "r" (__cu_len) \
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: "$4", "$5", "$6", "$8", "$9", "$10", "$11", "$12", "$15", \
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"$24", "$31","memory"); \
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__cu_len; \
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})
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#define copy_to_user(to,from,n) ({ \
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void *__cu_to; \
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const void *__cu_from; \
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long __cu_len; \
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\
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__cu_to = (to); \
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__cu_from = (from); \
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__cu_len = (n); \
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if (access_ok(VERIFY_WRITE, __cu_to, __cu_len)) \
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__asm__ __volatile__( \
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"move\t$4, %1\n\t" \
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"move\t$5, %2\n\t" \
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"move\t$6, %3\n\t" \
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__MODULE_JAL(__copy_user) \
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"move\t%0, $6" \
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: "=r" (__cu_len) \
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: "r" (__cu_to), "r" (__cu_from), "r" (__cu_len) \
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: "$4", "$5", "$6", "$8", "$9", "$10", "$11", "$12", \
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"$15", "$24", "$31","memory"); \
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__cu_len; \
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})
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#define copy_from_user(to,from,n) ({ \
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void *__cu_to; \
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const void *__cu_from; \
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long __cu_len; \
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\
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__cu_to = (to); \
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__cu_from = (from); \
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__cu_len = (n); \
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if (access_ok(VERIFY_READ, __cu_from, __cu_len)) \
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__asm__ __volatile__( \
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"move\t$4, %1\n\t" \
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"move\t$5, %2\n\t" \
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"move\t$6, %3\n\t" \
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".set\tnoreorder\n\t" \
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__MODULE_JAL(__copy_user) \
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".set\tnoat\n\t" \
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"addu\t$1, %2, %3\n\t" \
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".set\tat\n\t" \
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".set\treorder\n\t" \
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"move\t%0, $6" \
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: "=r" (__cu_len) \
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: "r" (__cu_to), "r" (__cu_from), "r" (__cu_len) \
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: "$4", "$5", "$6", "$8", "$9", "$10", "$11", "$12", \
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"$15", "$24", "$31","memory"); \
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__cu_len; \
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})
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extern inline __kernel_size_t
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__clear_user(void *addr, __kernel_size_t size)
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{
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__kernel_size_t res;
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__asm__ __volatile__(
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"move\t$4, %1\n\t"
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"move\t$5, $0\n\t"
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"move\t$6, %2\n\t"
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__MODULE_JAL(__bzero)
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"move\t%0, $6"
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: "=r" (res)
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: "r" (addr), "r" (size)
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: "$4", "$5", "$6", "$8", "$9", "$31");
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return res;
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}
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#define clear_user(addr,n) ({ \
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void * __cl_addr = (addr); \
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unsigned long __cl_size = (n); \
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if (__cl_size && access_ok(VERIFY_WRITE, ((unsigned long)(__cl_addr)), __cl_size)) \
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__cl_size = __clear_user(__cl_addr, __cl_size); \
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__cl_size; })
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/*
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* Returns: -EFAULT if exception before terminator, N if the entire
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* buffer filled, else strlen.
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*/
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extern inline long
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__strncpy_from_user(char *__to, const char *__from, long __len)
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{
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long res;
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__asm__ __volatile__(
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"move\t$4, %1\n\t"
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"move\t$5, %2\n\t"
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"move\t$6, %3\n\t"
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__MODULE_JAL(__strncpy_from_user_nocheck_asm)
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"move\t%0, $2"
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: "=r" (res)
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: "r" (__to), "r" (__from), "r" (__len)
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: "$2", "$3", "$4", "$5", "$6", "$8", "$31", "memory");
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return res;
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}
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extern inline long
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strncpy_from_user(char *__to, const char *__from, long __len)
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{
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long res;
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__asm__ __volatile__(
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"move\t$4, %1\n\t"
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"move\t$5, %2\n\t"
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"move\t$6, %3\n\t"
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__MODULE_JAL(__strncpy_from_user_asm)
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"move\t%0, $2"
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: "=r" (res)
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: "r" (__to), "r" (__from), "r" (__len)
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: "$2", "$3", "$4", "$5", "$6", "$8", "$31", "memory");
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return res;
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}
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/* Returns: 0 if bad, string length+1 (memory size) of string if ok */
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extern inline long __strlen_user(const char *s)
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{
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long res;
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__asm__ __volatile__(
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"move\t$4, %1\n\t"
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__MODULE_JAL(__strlen_user_nocheck_asm)
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"move\t%0, $2"
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: "=r" (res)
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: "r" (s)
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: "$2", "$4", "$8", "$31");
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return res;
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|
}
|
|
|
|
extern inline long strlen_user(const char *s)
|
|
{
|
|
long res;
|
|
|
|
__asm__ __volatile__(
|
|
"move\t$4, %1\n\t"
|
|
__MODULE_JAL(__strlen_user_asm)
|
|
"move\t%0, $2"
|
|
: "=r" (res)
|
|
: "r" (s)
|
|
: "$2", "$4", "$8", "$31");
|
|
|
|
return res;
|
|
}
|
|
|
|
/* Returns: 0 if bad, string length+1 (memory size) of string if ok */
|
|
extern inline long __strnlen_user(const char *s, long n)
|
|
{
|
|
long res;
|
|
|
|
__asm__ __volatile__(
|
|
"move\t$4, %1\n\t"
|
|
"move\t$5, %2\n\t"
|
|
__MODULE_JAL(__strnlen_user_nocheck_asm)
|
|
"move\t%0, $2"
|
|
: "=r" (res)
|
|
: "r" (s), "r" (n)
|
|
: "$2", "$4", "$5", "$8", "$31");
|
|
|
|
return res;
|
|
}
|
|
|
|
extern inline long strnlen_user(const char *s, long n)
|
|
{
|
|
long res;
|
|
|
|
__asm__ __volatile__(
|
|
"move\t$4, %1\n\t"
|
|
"move\t$5, %2\n\t"
|
|
__MODULE_JAL(__strnlen_user_asm)
|
|
"move\t%0, $2"
|
|
: "=r" (res)
|
|
: "r" (s), "r" (n)
|
|
: "$2", "$4", "$5", "$8", "$31");
|
|
|
|
return res;
|
|
}
|
|
|
|
struct exception_table_entry
|
|
{
|
|
unsigned long insn;
|
|
unsigned long nextinsn;
|
|
};
|
|
|
|
/* Returns 0 if exception not found and fixup.unit otherwise. */
|
|
extern unsigned long search_exception_table(unsigned long addr);
|
|
|
|
/* Returns the new pc */
|
|
#define fixup_exception(map_reg, fixup_unit, pc) \
|
|
({ \
|
|
fixup_unit; \
|
|
})
|
|
|
|
#endif /* _ASM_UACCESS_H */
|