patch-2.1.6 linux/include/asm-alpha/segment.h
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- Lines: 305
- Date:
Tue Oct 29 17:11:33 1996
- Orig file:
v2.1.5/linux/include/asm-alpha/segment.h
- Orig date:
Sat Oct 19 10:07:32 1996
diff -u --recursive --new-file v2.1.5/linux/include/asm-alpha/segment.h linux/include/asm-alpha/segment.h
@@ -1,300 +1,6 @@
-#ifndef _ASM_SEGMENT_H
-#define _ASM_SEGMENT_H
+#ifndef __ALPHA_SEGMENT_H
+#define __ALPHA_SEGMENT_H
-/*
- * 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.
- */
+/* Only here because we have some old header files that expect it.. */
-#define KERNEL_DS 0
-#define USER_DS 1
-
-#define get_fs() (current->tss.flags & 0x1)
-#define set_fs(x) (current->tss.flags = (current->tss.flags & ~0x1) | ((x) & 0x1))
-
-static inline unsigned long get_ds(void)
-{
- return 0;
-}
-
-/*
- * Is a address valid? This does a straighforward calculation rather
- * than tests.
- *
- * Address valid if:
- * - "addr" doesn't have any high-bits set
- * - AND "size" doesn't have any high-bits set
- * - AND "addr+size" doesn't have any high-bits set
- * - OR we are in kernel mode.
- */
-#define __access_ok(addr,size,mask) \
- (((mask)&((addr | size | (addr+size)) >> 42))==0)
-#define __access_mask (-(long)get_fs())
-
-#define access_ok(type,addr,size) \
- __access_ok(((unsigned long)(addr)),(size),__access_mask)
-
-/*
- * These are the main single-value transfer routines. They automatically
- * use the right size if we just have the right pointer type.
- *
- * As the alpha uses the same address space for kernel and user
- * data, we can just do these as direct assignments. (Of course, the
- * exception handling means that it's no longer "just"...)
- *
- * Careful to not
- * (a) re-use the arguments for side effects (sizeof/typeof is ok)
- * (b) require any knowledge of processes at this stage
- */
-#define put_user(x,ptr) __put_user((x),(ptr),sizeof(*(ptr)),__access_mask)
-#define get_user(x,ptr) __get_user((x),(ptr),sizeof(*(ptr)),__access_mask)
-
-#define copy_to_user(to,from,n) __copy_tofrom_user((to),(from),(n),__cu_to)
-#define copy_from_user(to,from,n) __copy_tofrom_user((to),(from),(n),__cu_from)
-
-/*
- * Not pretty? What do you mean not "not pretty"?
- */
-extern void __copy_user(void);
-
-#define __copy_tofrom_user(to,from,n,v) \
-({ \
- register void * __cu_to __asm__("$6") = (to); \
- register const void * __cu_from __asm__("$7") = (from); \
- register long __cu_len __asm__("$0") = (n); \
- if (__access_ok(((long)(v)),__cu_len,__access_mask)) { \
- register void * __cu_ex __asm__("$8"); \
- __cu_ex = ¤t->tss.ex; \
- __asm__ __volatile__( \
- "jsr $28,(%7),__copy_user" \
- : "=r" (__cu_len), "=r" (__cu_from), "=r" (__cu_to) \
- : "0" (__cu_len), "1" (__cu_from), "2" (__cu_to), \
- "r" (__cu_ex), "r" (__copy_user) \
- : "$1","$2","$3","$4","$5","$28","memory"); \
- } \
- __cu_len; \
-})
-
-extern void __get_user_unknown(void);
-
-#define __get_user(x,ptr,size,mask) \
-({ \
- long __gu_err = -EFAULT, __gu_val = 0; \
- const __typeof__(*(ptr)) *__gu_addr = (ptr); \
- if (__access_ok((long)__gu_addr,size,mask)) { \
- long __gu_ex_count = current->tss.ex.count; \
- switch (size) { \
- case 1: __get_user_8; break; \
- case 2: __get_user_16; break; \
- case 4: __get_user_32; break; \
- case 8: __get_user_64; break; \
- default: __get_user_unknown(); break; \
- } \
- } \
- (x) = (__typeof__(*(ptr))) __gu_val; \
- __gu_err; \
-})
-
-#define __get_user_64 \
- __asm__("/* Inline __get_user_64 */\n\t" \
- "br $28,1f\n\t" /* set up exception address */ \
- "br 2f\n" /* exception! */ \
- "1:\t" \
- "stq %5,%3\n\t" /* store inc'ed exception count */ \
- "ldq %1,%2\n\t" /* actual data load */ \
- "stq %4,%3\n\t" /* restore exception count */ \
- "clr %0\n" /* no exception: error = 0 */ \
- "2:\t/* End __get_user_64 */" \
- : "=r"(__gu_err), "=r"(__gu_val) \
- : "m"(*__gu_addr), "m"(current->tss.ex.count), \
- "r"(__gu_ex_count), "r"(__gu_ex_count+1), \
- "0"(__gu_err), "1"(__gu_val) \
- : "$28")
-
-#define __get_user_32 \
- __asm__("/* Inline __get_user_32 */\n\t" \
- "br $28,1f\n\t" /* set up exception address */ \
- "br 2f\n" /* exception! */ \
- "1:\t" \
- "stq %5,%3\n\t" /* store inc'ed exception count */ \
- "ldl %1,%2\n\t" /* actual data load */ \
- "stq %4,%3\n\t" /* restore exception count */ \
- "clr %0\n" /* no exception: error = 0 */ \
- "2:\t/* End __get_user_32 */" \
- : "=r"(__gu_err), "=r"(__gu_val) \
- : "m"(*__gu_addr), "m"(current->tss.ex.count), \
- "r"(__gu_ex_count), "r"(__gu_ex_count+1), \
- "0"(__gu_err), "1"(__gu_val) \
- : "$28")
-
-#define __get_user_16 \
- __asm__("/* Inline __get_user_16 */\n\t" \
- "br $28,1f\n\t" /* set up exception address */ \
- "br 2f\n" /* exception! */ \
- "1:\t" \
- "stq %6,%4\n\t" /* store inc'ed exception count */ \
- "ldq_u %1,%2\n\t" /* actual data load */ \
- "stq %5,%4\n\t" /* restore exception count */ \
- "clr %0\n\t" /* no exception: error = 0 */ \
- "extwl %1,%3,%1\n" /* extract the short */ \
- "2:\t/* End __get_user_16 */" \
- : "=r"(__gu_err), "=r"(__gu_val) \
- : "m"(*__gu_addr), "r"(__gu_addr), \
- "m"(current->tss.ex.count), "r"(__gu_ex_count), \
- "r"(__gu_ex_count+1), "0"(__gu_err), "1"(__gu_val) \
- : "$28")
-
-#define __get_user_8 \
- __asm__("/* Inline __get_user_8 */\n\t" \
- "br $28,1f\n\t" /* set up exception address */ \
- "br 2f\n" /* exception! */ \
- "1:\t" \
- "stq %6,%4\n\t" /* store inc'ed exception count */ \
- "ldq_u %1,%2\n\t" /* actual data load */ \
- "stq %5,%4\n\t" /* restore exception count */ \
- "clr %0\n\t" /* no exception: error = 0 */ \
- "extbl %1,%3,%1\n" /* extract the byte */ \
- "2:\t/* End __get_user_8 */" \
- : "=r"(__gu_err), "=r"(__gu_val) \
- : "m"(*__gu_addr), "r"(__gu_addr), \
- "m"(current->tss.ex.count), "r"(__gu_ex_count), \
- "r"(__gu_ex_count+1), "0"(__gu_err), "1"(__gu_val) \
- : "$28")
-
-extern void __put_user_unknown(void);
-
-#define __put_user(x,ptr,size,mask) \
-({ \
- long __pu_err = -EFAULT; \
- __typeof__(*(ptr)) *__pu_addr = (ptr); \
- __typeof__(*(ptr)) __pu_val = (x); \
- if (__access_ok((long)__pu_addr,size,mask)) { \
- long __pu_ex_count = current->tss.ex.count; \
- switch (size) { \
- case 1: __put_user_8; break; \
- case 2: __put_user_16; break; \
- case 4: __put_user_32; break; \
- case 8: __put_user_64; break; \
- default: __put_user_unknown(); break; \
- } \
- } \
- __pu_err; \
-})
-
-#define __put_user_64 \
- __asm__("/* Inline __put_user_64 */\n\t" \
- "br $28,1f\n\t" /* set up exception address */ \
- "br 2f\n" /* exception! */ \
- "1:\t" \
- "stq %5,%3\n\t" /* store inc'ed exception count */ \
- "stq %2,%1\n\t" /* actual data store */ \
- "stq %4,%3\n\t" /* restore exception count */ \
- "clr %0\n" /* no exception: error = 0 */ \
- "2:\t/* End __put_user_64 */" \
- : "=r"(__pu_err), "=m"(*__pu_addr) \
- : "r"(__pu_val), "m"(current->tss.ex.count), \
- "r"(__pu_ex_count), "r"(__pu_ex_count+1), \
- "0"(__pu_err) \
- : "$28")
-
-#define __put_user_32 \
- __asm__("/* Inline __put_user_32 */\n\t" \
- "br $28,1f\n\t" /* set up exception address */ \
- "br 2f\n" /* exception! */ \
- "1:\t" \
- "stq %5,%3\n\t" /* store inc'ed exception count */ \
- "stl %2,%1\n\t" /* actual data store */ \
- "stq %4,%3\n\t" /* restore exception count */ \
- "clr %0\n" /* no exception: error = 0 */ \
- "2:\t/* End __put_user_32 */" \
- : "=r"(__pu_err), "=m"(*__pu_addr) \
- : "r"(__pu_val), "m"(current->tss.ex.count), \
- "r"(__pu_ex_count), "r"(__pu_ex_count+1), \
- "0"(__pu_err) \
- : "$28")
-
-#define __put_user_16 \
- __asm__("/* Inline __put_user_16 */\n\t" \
- "br $28,1f\n\t" /* set up exception address */ \
- "lda %0,%7\n\t" /* exception! error = -EFAULT */ \
- "br 2f\n" \
- "1:\t" \
- "stq %6,%4\n\t" /* store inc'ed exception count */ \
- "ldq_u %0,%1\n\t" /* masked data store */ \
- "inswl %2,%3,%2\n\t" \
- "mskwl %0,%3,%0\n\t" \
- "or %0,%2,%2\n\t" \
- "stq_u %2,%1\n\t" \
- "stq %5,%4\n\t" /* restore exception count */ \
- "clr %0\n" /* no exception: error = 0 */ \
- "2:\t/* End __put_user_16 */" \
- : "=r"(__pu_err), "=m"(*__pu_addr), "=r"(__pu_val) \
- : "r"(__pu_addr), "m"(current->tss.ex.count), \
- "r"(__pu_ex_count), "r"(__pu_ex_count+1), "i"(-EFAULT), \
- "2"(__pu_val) \
- : "$28")
-
-#define __put_user_8 \
- __asm__("/* Inline __put_user_8 */\n\t" \
- "br $28,1f\n\t" /* set up exception address */ \
- "lda %0,%7\n\t" /* exception! error = -EFAULT */ \
- "br 2f\n" \
- "1:\t" \
- "stq %6,%4\n\t" /* store inc'ed exception count */ \
- "ldq_u %0,%1\n\t" /* masked data store */ \
- "insbl %2,%3,%2\n\t" \
- "mskbl %0,%3,%0\n\t" \
- "or %0,%2,%2\n\t" \
- "stq_u %2,%1\n\t" \
- "stq %5,%4\n\t" /* restore exception count */ \
- "clr %0\n" /* no exception: error = 0 */ \
- "2:\t/* End __put_user_8 */" \
- : "=r"(__pu_err), "=m"(*__pu_addr), "=r"(__pu_val) \
- : "r"(__pu_addr), "m"(current->tss.ex.count), \
- "r"(__pu_ex_count), "r"(__pu_ex_count+1), "i"(-EFAULT), \
- "2"(__pu_val) \
- : "$28")
-
-
-extern void __clear_user(void);
-
-#define clear_user(to,n) \
-({ \
- register void * __cl_to __asm__("$6") = (to); \
- register long __cl_len __asm__("$0") = (n); \
- if (__access_ok(((long)__cl_to),__cl_len,__access_mask)) { \
- register void * __cl_ex __asm__("$7"); \
- __cl_ex = ¤t->tss.ex; \
- __asm__ __volatile__( \
- "jsr $28,(%2),__clear_user" \
- : "=r"(__cl_len), "=r"(__cl_to) \
- : "r"(__clear_user), "r"(__cl_ex), \
- "0"(__cl_len), "1"(__cl_to) \
- : "$1","$2","$3","$4","$5","$28","memory"); \
- } \
- __cl_len; \
-})
-
-
-/* Returns: -EFAULT if exception before terminator, N if the entire
- buffer filled, else strlen. */
-
-struct exception_struct;
-extern long __strncpy_from_user(char *__to, const char *__from,
- long __to_len, struct exception_struct *);
-
-#define strncpy_from_user(to,from,n) \
-({ \
- char * __sfu_to = (to); \
- const char * __sfu_from = (from); \
- long __sfu_len = (n), __sfu_ret = -EFAULT; \
- if (__access_ok(((long)__sfu_from),__sfu_len,__access_mask)) { \
- __sfu_ret = __strncpy_from_user(__sfu_to,__sfu_from, \
- __sfu_len, ¤t->tss.ex); \
- __sfu_ret; \
-})
-
-#endif /* _ASM_SEGMENT_H */
+#endif
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