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Matheus
37 lines
1.4 KiB
C
37 lines
1.4 KiB
C
#ifndef _USERCOPY_H
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#define _USERCOPY_H
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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//IS_USER_ADDRESS(a) is provided by arch/mmu.h
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#include <arch/mmu.h>
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static inline int _usercopy_memcpy_wrapper(void *dst, void *src, size_t size) {
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memcpy(dst, src, size);
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return 0;
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}
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static inline int _usercopy_strlen_wrapper(void *str, size_t *size) {
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*size = strlen(str);
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return 0;
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}
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static inline int _usercopy_memset_wrapper(void *dst, uint8_t byte, size_t size) {
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memset(dst, byte, size);
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return 0;
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}
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#define USERCOPY_POSSIBLY_FROM_USER(kernel, user, size) (IS_USER_ADDRESS(user) ? usercopy_fromuser(kernel, user, size) : _usercopy_memcpy_wrapper(kernel, user, size))
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#define USERCOPY_POSSIBLY_TO_USER(user, kernel, size) (IS_USER_ADDRESS(user) ? usercopy_touser(user, kernel, size) : _usercopy_memcpy_wrapper(user, kernel, size))
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#define USERCOPY_POSSIBLY_STRLEN_FROM_USER(user, sizep) (IS_USER_ADDRESS(user) ? usercopy_strlen(user, sizep) : _usercopy_strlen_wrapper(user, sizep))
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#define USERCOPY_POSSIBLY_MEMSET_TO_USER(user, byte, size) (IS_USER_ADDRESS(user) ? usercopy_memset(user, byte, size) : _usercopy_memset_wrapper(user, byte, size))
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int usercopy_touser(void *user, void *kernel, size_t size);
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int usercopy_fromuser(void *kernel, void *user, size_t size);
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int usercopy_fromuseratomic32(uint32_t *user32, uint32_t *value);
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int usercopy_strlen(const char *, size_t *size);
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int usercopy_memset(void *user, uint8_t byte, size_t size);
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#endif
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