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use kernel like macros for user access (will be useful someday to have a better error checking

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@634 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2004-02-22 13:40:13 +00:00
parent 121061dcdf
commit edf779ffcc
4 changed files with 142 additions and 112 deletions
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118
linux-user/qemu.h
View file

@ -4,6 +4,7 @@
#include "thunk.h"
#include <signal.h>
#include <string.h>
#include "syscall_defs.h"
#include "cpu.h"
@ -120,4 +121,121 @@ long target_mremap(unsigned long old_addr, unsigned long old_size,
unsigned long new_addr);
int target_msync(unsigned long start, unsigned long len, int flags);
/* user access */
#define VERIFY_READ 0
#define VERIFY_WRITE 1
#define access_ok(type,addr,size) (1)
#define __put_user(x,ptr)\
({\
int size = sizeof(*ptr);\
switch(size) {\
case 1:\
stb(ptr, (typeof(*ptr))(x));\
break;\
case 2:\
stw(ptr, (typeof(*ptr))(x));\
break;\
case 4:\
stl(ptr, (typeof(*ptr))(x));\
break;\
case 8:\
stq(ptr, (typeof(*ptr))(x));\
break;\
default:\
abort();\
}\
0;\
})
#define __get_user(x, ptr) \
({\
int size = sizeof(*ptr);\
switch(size) {\
case 1:\
x = (typeof(*ptr))ldub(ptr);\
break;\
case 2:\
x = (typeof(*ptr))lduw(ptr);\
break;\
case 4:\
x = (typeof(*ptr))ldl(ptr);\
break;\
case 8:\
x = (typeof(*ptr))ldq(ptr);\
break;\
default:\
abort();\
}\
0;\
})
static inline unsigned long __copy_to_user(void *dst, const void *src,
unsigned long size)
{
memcpy(dst, src, size);
return 0;
}
static inline unsigned long __copy_from_user(void *dst, const void *src,
unsigned long size)
{
memcpy(dst, src, size);
return 0;
}
static inline unsigned long __clear_user(void *dst, unsigned long size)
{
memset(dst, 0, size);
return 0;
}
#define put_user(x,ptr)\
({\
int __ret;\
if (access_ok(VERIFY_WRITE, ptr, sizeof(*ptr)))\
__ret = __put_user(x, ptr);\
else\
__ret = -EFAULT;\
__ret;\
})
#define get_user(x,ptr)\
({\
int __ret;\
if (access_ok(VERIFY_READ, ptr, sizeof(*ptr)))\
__ret = __get_user(x, ptr);\
else\
__ret = -EFAULT;\
__ret;\
})
static inline unsigned long copy_to_user(void *dst, const void *src,
unsigned long size)
{
if (access_ok(VERIFY_WRITE, dst, size))
return __copy_to_user(dst, src, size);
else
return size;
}
static inline unsigned long copy_from_user(void *dst, const void *src,
unsigned long size)
{
if (access_ok(VERIFY_READ, src, size))
return __copy_from_user(dst, src, size);
else
return size;
}
static inline unsigned long clear_user(void *dst, unsigned long size)
{
if (access_ok(VERIFY_WRITE, dst, size))
return __clear_user(dst, size);
else
return size;
}
#endif