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Diffstat (limited to 'include/asm-ppc/uaccess.h')
-rw-r--r--include/asm-ppc/uaccess.h393
1 files changed, 0 insertions, 393 deletions
diff --git a/include/asm-ppc/uaccess.h b/include/asm-ppc/uaccess.h
deleted file mode 100644
index 63f56224da8..00000000000
--- a/include/asm-ppc/uaccess.h
+++ /dev/null
@@ -1,393 +0,0 @@
-#ifdef __KERNEL__
-#ifndef _PPC_UACCESS_H
-#define _PPC_UACCESS_H
-
-#ifndef __ASSEMBLY__
-#include <linux/sched.h>
-#include <linux/errno.h>
-#include <asm/processor.h>
-
-#define VERIFY_READ 0
-#define VERIFY_WRITE 1
-
-/*
- * The fs value determines whether argument validity checking should be
- * performed or not. If get_fs() == USER_DS, checking is performed, with
- * get_fs() == KERNEL_DS, checking is bypassed.
- *
- * For historical reasons, these macros are grossly misnamed.
- *
- * The fs/ds values are now the highest legal address in the "segment".
- * This simplifies the checking in the routines below.
- */
-
-#define KERNEL_DS ((mm_segment_t) { ~0UL })
-#define USER_DS ((mm_segment_t) { TASK_SIZE - 1 })
-
-#define get_ds() (KERNEL_DS)
-#define get_fs() (current->thread.fs)
-#define set_fs(val) (current->thread.fs = (val))
-
-#define segment_eq(a,b) ((a).seg == (b).seg)
-
-#define __access_ok(addr,size) \
- ((addr) <= current->thread.fs.seg \
- && ((size) == 0 || (size) - 1 <= current->thread.fs.seg - (addr)))
-
-#define access_ok(type, addr, size) \
- (__chk_user_ptr(addr),__access_ok((unsigned long)(addr),(size)))
-
-/*
- * The exception table consists of pairs of addresses: the first is the
- * address of an instruction that is allowed to fault, and the second is
- * the address at which the program should continue. No registers are
- * modified, so it is entirely up to the continuation code to figure out
- * what to do.
- *
- * All the routines below use bits of fixup code that are out of line
- * with the main instruction path. This means when everything is well,
- * we don't even have to jump over them. Further, they do not intrude
- * on our cache or tlb entries.
- */
-
-struct exception_table_entry
-{
- unsigned long insn, fixup;
-};
-
-/*
- * These are the main single-value transfer routines. They automatically
- * use the right size if we just have the right pointer type.
- *
- * This gets kind of ugly. We want to return _two_ values in "get_user()"
- * and yet we don't want to do any pointers, because that is too much
- * of a performance impact. Thus we have a few rather ugly macros here,
- * and hide all the ugliness from the user.
- *
- * The "__xxx" versions of the user access functions are versions that
- * do not verify the address space, that must have been done previously
- * with a separate "access_ok()" call (this is used when we do multiple
- * accesses to the same area of user memory).
- *
- * As we use the same address space for kernel and user data on the
- * PowerPC, we can just do these as direct assignments. (Of course, the
- * exception handling means that it's no longer "just"...)
- *
- * The "user64" versions of the user access functions are versions that
- * allow access of 64-bit data. The "get_user" functions do not
- * properly handle 64-bit data because the value gets down cast to a long.
- * The "put_user" functions already handle 64-bit data properly but we add
- * "user64" versions for completeness
- */
-#define get_user(x,ptr) \
- __get_user_check((x),(ptr),sizeof(*(ptr)))
-#define get_user64(x,ptr) \
- __get_user64_check((x),(ptr),sizeof(*(ptr)))
-#define put_user(x,ptr) \
- __put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
-#define put_user64(x,ptr) put_user(x,ptr)
-
-#define __get_user(x,ptr) \
- __get_user_nocheck((x),(ptr),sizeof(*(ptr)))
-#define __get_user64(x,ptr) \
- __get_user64_nocheck((x),(ptr),sizeof(*(ptr)))
-#define __put_user(x,ptr) \
- __put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
-#define __put_user64(x,ptr) __put_user(x,ptr)
-
-extern long __put_user_bad(void);
-
-#define __put_user_nocheck(x,ptr,size) \
-({ \
- long __pu_err; \
- __chk_user_ptr(ptr); \
- __put_user_size((x),(ptr),(size),__pu_err); \
- __pu_err; \
-})
-
-#define __put_user_check(x,ptr,size) \
-({ \
- long __pu_err = -EFAULT; \
- __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
- if (access_ok(VERIFY_WRITE,__pu_addr,size)) \
- __put_user_size((x),__pu_addr,(size),__pu_err); \
- __pu_err; \
-})
-
-#define __put_user_size(x,ptr,size,retval) \
-do { \
- retval = 0; \
- switch (size) { \
- case 1: \
- __put_user_asm(x, ptr, retval, "stb"); \
- break; \
- case 2: \
- __put_user_asm(x, ptr, retval, "sth"); \
- break; \
- case 4: \
- __put_user_asm(x, ptr, retval, "stw"); \
- break; \
- case 8: \
- __put_user_asm2(x, ptr, retval); \
- break; \
- default: \
- __put_user_bad(); \
- } \
-} while (0)
-
-/*
- * We don't tell gcc that we are accessing memory, but this is OK
- * because we do not write to any memory gcc knows about, so there
- * are no aliasing issues.
- */
-#define __put_user_asm(x, addr, err, op) \
- __asm__ __volatile__( \
- "1: "op" %1,0(%2)\n" \
- "2:\n" \
- ".section .fixup,\"ax\"\n" \
- "3: li %0,%3\n" \
- " b 2b\n" \
- ".previous\n" \
- ".section __ex_table,\"a\"\n" \
- " .align 2\n" \
- " .long 1b,3b\n" \
- ".previous" \
- : "=r" (err) \
- : "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
-
-#define __put_user_asm2(x, addr, err) \
- __asm__ __volatile__( \
- "1: stw %1,0(%2)\n" \
- "2: stw %1+1,4(%2)\n" \
- "3:\n" \
- ".section .fixup,\"ax\"\n" \
- "4: li %0,%3\n" \
- " b 3b\n" \
- ".previous\n" \
- ".section __ex_table,\"a\"\n" \
- " .align 2\n" \
- " .long 1b,4b\n" \
- " .long 2b,4b\n" \
- ".previous" \
- : "=r" (err) \
- : "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
-
-#define __get_user_nocheck(x, ptr, size) \
-({ \
- long __gu_err; \
- unsigned long __gu_val; \
- __chk_user_ptr(ptr); \
- __get_user_size(__gu_val, (ptr), (size), __gu_err); \
- (x) = (__typeof__(*(ptr)))__gu_val; \
- __gu_err; \
-})
-
-#define __get_user64_nocheck(x, ptr, size) \
-({ \
- long __gu_err; \
- long long __gu_val; \
- __chk_user_ptr(ptr); \
- __get_user_size64(__gu_val, (ptr), (size), __gu_err); \
- (x) = (__typeof__(*(ptr)))__gu_val; \
- __gu_err; \
-})
-
-#define __get_user_check(x, ptr, size) \
-({ \
- long __gu_err = -EFAULT; \
- unsigned long __gu_val = 0; \
- const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
- if (access_ok(VERIFY_READ, __gu_addr, (size))) \
- __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
- (x) = (__typeof__(*(ptr)))__gu_val; \
- __gu_err; \
-})
-
-#define __get_user64_check(x, ptr, size) \
-({ \
- long __gu_err = -EFAULT; \
- long long __gu_val = 0; \
- const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
- if (access_ok(VERIFY_READ, __gu_addr, (size))) \
- __get_user_size64(__gu_val, __gu_addr, (size), __gu_err); \
- (x) = (__typeof__(*(ptr)))__gu_val; \
- __gu_err; \
-})
-
-extern long __get_user_bad(void);
-
-#define __get_user_size(x, ptr, size, retval) \
-do { \
- retval = 0; \
- switch (size) { \
- case 1: \
- __get_user_asm(x, ptr, retval, "lbz"); \
- break; \
- case 2: \
- __get_user_asm(x, ptr, retval, "lhz"); \
- break; \
- case 4: \
- __get_user_asm(x, ptr, retval, "lwz"); \
- break; \
- default: \
- x = __get_user_bad(); \
- } \
-} while (0)
-
-#define __get_user_size64(x, ptr, size, retval) \
-do { \
- retval = 0; \
- switch (size) { \
- case 1: \
- __get_user_asm(x, ptr, retval, "lbz"); \
- break; \
- case 2: \
- __get_user_asm(x, ptr, retval, "lhz"); \
- break; \
- case 4: \
- __get_user_asm(x, ptr, retval, "lwz"); \
- break; \
- case 8: \
- __get_user_asm2(x, ptr, retval); \
- break; \
- default: \
- x = __get_user_bad(); \
- } \
-} while (0)
-
-#define __get_user_asm(x, addr, err, op) \
- __asm__ __volatile__( \
- "1: "op" %1,0(%2)\n" \
- "2:\n" \
- ".section .fixup,\"ax\"\n" \
- "3: li %0,%3\n" \
- " li %1,0\n" \
- " b 2b\n" \
- ".previous\n" \
- ".section __ex_table,\"a\"\n" \
- " .align 2\n" \
- " .long 1b,3b\n" \
- ".previous" \
- : "=r"(err), "=r"(x) \
- : "b"(addr), "i"(-EFAULT), "0"(err))
-
-#define __get_user_asm2(x, addr, err) \
- __asm__ __volatile__( \
- "1: lwz %1,0(%2)\n" \
- "2: lwz %1+1,4(%2)\n" \
- "3:\n" \
- ".section .fixup,\"ax\"\n" \
- "4: li %0,%3\n" \
- " li %1,0\n" \
- " li %1+1,0\n" \
- " b 3b\n" \
- ".previous\n" \
- ".section __ex_table,\"a\"\n" \
- " .align 2\n" \
- " .long 1b,4b\n" \
- " .long 2b,4b\n" \
- ".previous" \
- : "=r"(err), "=&r"(x) \
- : "b"(addr), "i"(-EFAULT), "0"(err))
-
-/* more complex routines */
-
-extern int __copy_tofrom_user(void __user *to, const void __user *from,
- unsigned long size);
-
-extern inline unsigned long
-copy_from_user(void *to, const void __user *from, unsigned long n)
-{
- unsigned long over;
-
- if (access_ok(VERIFY_READ, from, n))
- return __copy_tofrom_user((__force void __user *)to, from, n);
- if ((unsigned long)from < TASK_SIZE) {
- over = (unsigned long)from + n - TASK_SIZE;
- return __copy_tofrom_user((__force void __user *)to, from, n - over) + over;
- }
- return n;
-}
-
-extern inline unsigned long
-copy_to_user(void __user *to, const void *from, unsigned long n)
-{
- unsigned long over;
-
- if (access_ok(VERIFY_WRITE, to, n))
- return __copy_tofrom_user(to, (__force void __user *) from, n);
- if ((unsigned long)to < TASK_SIZE) {
- over = (unsigned long)to + n - TASK_SIZE;
- return __copy_tofrom_user(to, (__force void __user *) from, n - over) + over;
- }
- return n;
-}
-
-static inline unsigned long __copy_from_user(void *to, const void __user *from, unsigned long size)
-{
- return __copy_tofrom_user((__force void __user *)to, from, size);
-}
-
-static inline unsigned long __copy_to_user(void __user *to, const void *from, unsigned long size)
-{
- return __copy_tofrom_user(to, (__force void __user *)from, size);
-}
-
-#define __copy_to_user_inatomic __copy_to_user
-#define __copy_from_user_inatomic __copy_from_user
-
-extern unsigned long __clear_user(void __user *addr, unsigned long size);
-
-extern inline unsigned long
-clear_user(void __user *addr, unsigned long size)
-{
- if (access_ok(VERIFY_WRITE, addr, size))
- return __clear_user(addr, size);
- if ((unsigned long)addr < TASK_SIZE) {
- unsigned long over = (unsigned long)addr + size - TASK_SIZE;
- return __clear_user(addr, size - over) + over;
- }
- return size;
-}
-
-extern int __strncpy_from_user(char *dst, const char __user *src, long count);
-
-extern inline long
-strncpy_from_user(char *dst, const char __user *src, long count)
-{
- if (access_ok(VERIFY_READ, src, 1))
- return __strncpy_from_user(dst, src, count);
- return -EFAULT;
-}
-
-/*
- * Return the size of a string (including the ending 0)
- *
- * Return 0 for error
- */
-
-extern int __strnlen_user(const char __user *str, long len, unsigned long top);
-
-/*
- * Returns the length of the string at str (including the null byte),
- * or 0 if we hit a page we can't access,
- * or something > len if we didn't find a null byte.
- *
- * The `top' parameter to __strnlen_user is to make sure that
- * we can never overflow from the user area into kernel space.
- */
-extern __inline__ int strnlen_user(const char __user *str, long len)
-{
- unsigned long top = current->thread.fs.seg;
-
- if ((unsigned long)str > top)
- return 0;
- return __strnlen_user(str, len, top);
-}
-
-#define strlen_user(str) strnlen_user((str), 0x7ffffffe)
-
-#endif /* __ASSEMBLY__ */
-
-#endif /* _PPC_UACCESS_H */
-#endif /* __KERNEL__ */
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-22 19:34:21 +0000