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-rw-r--r--include/asm-sh/uaccess.h600
1 files changed, 600 insertions, 0 deletions
diff --git a/include/asm-sh/uaccess.h b/include/asm-sh/uaccess.h
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+++ b/include/asm-sh/uaccess.h
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+/* $Id: uaccess.h,v 1.11 2003/10/13 07:21:20 lethal Exp $
+ *
+ * User space memory access functions
+ *
+ * Copyright (C) 1999, 2002 Niibe Yutaka
+ * Copyright (C) 2003 Paul Mundt
+ *
+ * Based on:
+ * MIPS implementation version 1.15 by
+ * Copyright (C) 1996, 1997, 1998 by Ralf Baechle
+ * and i386 version.
+ */
+#ifndef __ASM_SH_UACCESS_H
+#define __ASM_SH_UACCESS_H
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+
+/*
+ * NOTE: Macro/functions in this file depends on threads_info.h implementation.
+ * Assumes:
+ * TI_FLAGS == 8
+ * TIF_USERSPACE == 31
+ * USER_ADDR_LIMIT == 0x80000000
+ */
+
+#define VERIFY_READ 0
+#define VERIFY_WRITE 1
+
+typedef struct {
+ unsigned int is_user_space;
+} mm_segment_t;
+
+/*
+ * 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 (Data Segment Register?), these macros are misnamed.
+ */
+
+#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
+#define segment_eq(a,b) ((a).is_user_space == (b).is_user_space)
+
+#define USER_ADDR_LIMIT 0x80000000
+
+#define KERNEL_DS MAKE_MM_SEG(0)
+#define USER_DS MAKE_MM_SEG(1)
+
+#define get_ds() (KERNEL_DS)
+
+#if !defined(CONFIG_MMU)
+static inline mm_segment_t get_fs(void)
+{
+ return USER_DS;
+}
+
+static inline void set_fs(mm_segment_t s)
+{
+}
+
+/*
+ * __access_ok: Check if address with size is OK or not.
+ *
+ * If we don't have an MMU (or if its disabled) the only thing we really have
+ * to look out for is if the address resides somewhere outside of what
+ * available RAM we have.
+ *
+ * TODO: This check could probably also stand to be restricted somewhat more..
+ * though it still does the Right Thing(tm) for the time being.
+ */
+static inline int __access_ok(unsigned long addr, unsigned long size)
+{
+ extern unsigned long memory_start, memory_end;
+
+ return ((addr >= memory_start) && ((addr + size) < memory_end));
+}
+#else /* CONFIG_MMU */
+static inline mm_segment_t get_fs(void)
+{
+ return MAKE_MM_SEG(test_thread_flag(TIF_USERSPACE));
+}
+
+static inline void set_fs(mm_segment_t s)
+{
+ unsigned long ti, flag;
+ __asm__ __volatile__(
+ "stc r7_bank, %0\n\t"
+ "mov.l @(8,%0), %1\n\t"
+ "shal %1\n\t"
+ "cmp/pl %2\n\t"
+ "rotcr %1\n\t"
+ "mov.l %1, @(8,%0)"
+ : "=&r" (ti), "=&r" (flag)
+ : "r" (s.is_user_space)
+ : "t");
+/****
+ if (s.is_user_space)
+ set_thread_flag(TIF_USERSPACE);
+ else
+ clear_thread_flag(TIF_USERSPACE);
+****/
+}
+
+/*
+ * __access_ok: Check if address with size is OK or not.
+ *
+ * We do three checks:
+ * (1) is it user space?
+ * (2) addr + size --> carry?
+ * (3) addr + size >= 0x80000000 (USER_ADDR_LIMIT)
+ *
+ * (1) (2) (3) | RESULT
+ * 0 0 0 | ok
+ * 0 0 1 | ok
+ * 0 1 0 | bad
+ * 0 1 1 | bad
+ * 1 0 0 | ok
+ * 1 0 1 | bad
+ * 1 1 0 | bad
+ * 1 1 1 | bad
+ */
+static inline int __access_ok(unsigned long addr, unsigned long size)
+{
+ unsigned long flag, tmp;
+
+ __asm__("stc r7_bank, %0\n\t"
+ "mov.l @(8,%0), %0\n\t"
+ "clrt\n\t"
+ "addc %2, %1\n\t"
+ "and %1, %0\n\t"
+ "rotcl %0\n\t"
+ "rotcl %0\n\t"
+ "and #3, %0"
+ : "=&z" (flag), "=r" (tmp)
+ : "r" (addr), "1" (size)
+ : "t");
+
+ return flag == 0;
+}
+#endif /* CONFIG_MMU */
+
+static inline int access_ok(int type, const void __user *p, unsigned long size)
+{
+ unsigned long addr = (unsigned long)p;
+ return __access_ok(addr, size);
+}
+
+/* this function will go away soon - use access_ok() instead */
+static inline int __deprecated verify_area(int type, const void __user * addr, unsigned long size)
+{
+ return access_ok(type,addr,size) ? 0 : -EFAULT;
+}
+
+/*
+ * Uh, these should become the main single-value transfer routines ...
+ * They automatically use the right size if we just have the right
+ * pointer type ...
+ *
+ * As SuperH uses the same address space for kernel and user data, we
+ * can just do these as direct assignments.
+ *
+ * Careful to not
+ * (a) re-use the arguments for side effects (sizeof is ok)
+ * (b) require any knowledge of processes at this stage
+ */
+#define put_user(x,ptr) __put_user_check((x),(ptr),sizeof(*(ptr)))
+#define get_user(x,ptr) __get_user_check((x),(ptr),sizeof(*(ptr)))
+
+/*
+ * The "__xxx" versions do not do address space checking, useful when
+ * doing multiple accesses to the same area (the user has to do the
+ * checks by hand with "access_ok()")
+ */
+#define __put_user(x,ptr) \
+ __put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
+#define __get_user(x,ptr) \
+ __get_user_nocheck((x),(ptr),sizeof(*(ptr)))
+
+struct __large_struct { unsigned long buf[100]; };
+#define __m(x) (*(struct __large_struct *)(x))
+
+#define __get_user_size(x,ptr,size,retval) \
+do { \
+ retval = 0; \
+ switch (size) { \
+ case 1: \
+ __get_user_asm(x, ptr, retval, "b"); \
+ break; \
+ case 2: \
+ __get_user_asm(x, ptr, retval, "w"); \
+ break; \
+ case 4: \
+ __get_user_asm(x, ptr, retval, "l"); \
+ break; \
+ default: \
+ __get_user_unknown(); \
+ break; \
+ } \
+} while (0)
+
+#define __get_user_nocheck(x,ptr,size) \
+({ \
+ long __gu_err, __gu_val; \
+ __get_user_size(__gu_val, (ptr), (size), __gu_err); \
+ (x) = (__typeof__(*(ptr)))__gu_val; \
+ __gu_err; \
+})
+
+#define __get_user_check(x,ptr,size) \
+({ \
+ long __gu_err, __gu_val; \
+ switch (size) { \
+ case 1: \
+ __get_user_1(__gu_val, (ptr), __gu_err); \
+ break; \
+ case 2: \
+ __get_user_2(__gu_val, (ptr), __gu_err); \
+ break; \
+ case 4: \
+ __get_user_4(__gu_val, (ptr), __gu_err); \
+ break; \
+ default: \
+ __get_user_unknown(); \
+ break; \
+ } \
+ \
+ (x) = (__typeof__(*(ptr)))__gu_val; \
+ __gu_err; \
+})
+
+#define __get_user_1(x,addr,err) ({ \
+__asm__("stc r7_bank, %1\n\t" \
+ "mov.l @(8,%1), %1\n\t" \
+ "and %2, %1\n\t" \
+ "cmp/pz %1\n\t" \
+ "bt/s 1f\n\t" \
+ " mov #0, %0\n\t" \
+ "0:\n" \
+ "mov #-14, %0\n\t" \
+ "bra 2f\n\t" \
+ " mov #0, %1\n" \
+ "1:\n\t" \
+ "mov.b @%2, %1\n\t" \
+ "extu.b %1, %1\n" \
+ "2:\n" \
+ ".section __ex_table,\"a\"\n\t" \
+ ".long 1b, 0b\n\t" \
+ ".previous" \
+ : "=&r" (err), "=&r" (x) \
+ : "r" (addr) \
+ : "t"); \
+})
+
+#define __get_user_2(x,addr,err) ({ \
+__asm__("stc r7_bank, %1\n\t" \
+ "mov.l @(8,%1), %1\n\t" \
+ "and %2, %1\n\t" \
+ "cmp/pz %1\n\t" \
+ "bt/s 1f\n\t" \
+ " mov #0, %0\n\t" \
+ "0:\n" \
+ "mov #-14, %0\n\t" \
+ "bra 2f\n\t" \
+ " mov #0, %1\n" \
+ "1:\n\t" \
+ "mov.w @%2, %1\n\t" \
+ "extu.w %1, %1\n" \
+ "2:\n" \
+ ".section __ex_table,\"a\"\n\t" \
+ ".long 1b, 0b\n\t" \
+ ".previous" \
+ : "=&r" (err), "=&r" (x) \
+ : "r" (addr) \
+ : "t"); \
+})
+
+#define __get_user_4(x,addr,err) ({ \
+__asm__("stc r7_bank, %1\n\t" \
+ "mov.l @(8,%1), %1\n\t" \
+ "and %2, %1\n\t" \
+ "cmp/pz %1\n\t" \
+ "bt/s 1f\n\t" \
+ " mov #0, %0\n\t" \
+ "0:\n" \
+ "mov #-14, %0\n\t" \
+ "bra 2f\n\t" \
+ " mov #0, %1\n" \
+ "1:\n\t" \
+ "mov.l @%2, %1\n\t" \
+ "2:\n" \
+ ".section __ex_table,\"a\"\n\t" \
+ ".long 1b, 0b\n\t" \
+ ".previous" \
+ : "=&r" (err), "=&r" (x) \
+ : "r" (addr) \
+ : "t"); \
+})
+
+#define __get_user_asm(x, addr, err, insn) \
+({ \
+__asm__ __volatile__( \
+ "1:\n\t" \
+ "mov." insn " %2, %1\n\t" \
+ "mov #0, %0\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3:\n\t" \
+ "mov #0, %1\n\t" \
+ "mov.l 4f, %0\n\t" \
+ "jmp @%0\n\t" \
+ " mov %3, %0\n" \
+ "4: .long 2b\n\t" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n\t" \
+ ".long 1b, 3b\n\t" \
+ ".previous" \
+ :"=&r" (err), "=&r" (x) \
+ :"m" (__m(addr)), "i" (-EFAULT)); })
+
+extern void __get_user_unknown(void);
+
+#define __put_user_size(x,ptr,size,retval) \
+do { \
+ retval = 0; \
+ switch (size) { \
+ case 1: \
+ __put_user_asm(x, ptr, retval, "b"); \
+ break; \
+ case 2: \
+ __put_user_asm(x, ptr, retval, "w"); \
+ break; \
+ case 4: \
+ __put_user_asm(x, ptr, retval, "l"); \
+ break; \
+ case 8: \
+ __put_user_u64(x, ptr, retval); \
+ break; \
+ default: \
+ __put_user_unknown(); \
+ } \
+} while (0)
+
+#define __put_user_nocheck(x,ptr,size) \
+({ \
+ long __pu_err; \
+ __put_user_size((x),(ptr),(size),__pu_err); \
+ __pu_err; \
+})
+
+#define __put_user_check(x,ptr,size) \
+({ \
+ long __pu_err = -EFAULT; \
+ __typeof__(*(ptr)) *__pu_addr = (ptr); \
+ \
+ if (__access_ok((unsigned long)__pu_addr,size)) \
+ __put_user_size((x),__pu_addr,(size),__pu_err); \
+ __pu_err; \
+})
+
+#define __put_user_asm(x, addr, err, insn) \
+({ \
+__asm__ __volatile__( \
+ "1:\n\t" \
+ "mov." insn " %1, %2\n\t" \
+ "mov #0, %0\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3:\n\t" \
+ "nop\n\t" \
+ "mov.l 4f, %0\n\t" \
+ "jmp @%0\n\t" \
+ "mov %3, %0\n" \
+ "4: .long 2b\n\t" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n\t" \
+ ".long 1b, 3b\n\t" \
+ ".previous" \
+ :"=&r" (err) \
+ :"r" (x), "m" (__m(addr)), "i" (-EFAULT) \
+ :"memory"); })
+
+#if defined(__LITTLE_ENDIAN__)
+#define __put_user_u64(val,addr,retval) \
+({ \
+__asm__ __volatile__( \
+ "1:\n\t" \
+ "mov.l %R1,%2\n\t" \
+ "mov.l %S1,%T2\n\t" \
+ "mov #0,%0\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3:\n\t" \
+ "nop\n\t" \
+ "mov.l 4f,%0\n\t" \
+ "jmp @%0\n\t" \
+ " mov %3,%0\n" \
+ "4: .long 2b\n\t" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n\t" \
+ ".long 1b, 3b\n\t" \
+ ".previous" \
+ : "=r" (retval) \
+ : "r" (val), "m" (__m(addr)), "i" (-EFAULT) \
+ : "memory"); })
+#else
+#define __put_user_u64(val,addr,retval) \
+({ \
+__asm__ __volatile__( \
+ "1:\n\t" \
+ "mov.l %S1,%2\n\t" \
+ "mov.l %R1,%T2\n\t" \
+ "mov #0,%0\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3:\n\t" \
+ "nop\n\t" \
+ "mov.l 4f,%0\n\t" \
+ "jmp @%0\n\t" \
+ " mov %3,%0\n" \
+ "4: .long 2b\n\t" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n\t" \
+ ".long 1b, 3b\n\t" \
+ ".previous" \
+ : "=r" (retval) \
+ : "r" (val), "m" (__m(addr)), "i" (-EFAULT) \
+ : "memory"); })
+#endif
+
+extern void __put_user_unknown(void);
+
+/* Generic arbitrary sized copy. */
+/* Return the number of bytes NOT copied */
+extern __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
+
+#define copy_to_user(to,from,n) ({ \
+void *__copy_to = (void *) (to); \
+__kernel_size_t __copy_size = (__kernel_size_t) (n); \
+__kernel_size_t __copy_res; \
+if(__copy_size && __access_ok((unsigned long)__copy_to, __copy_size)) { \
+__copy_res = __copy_user(__copy_to, (void *) (from), __copy_size); \
+} else __copy_res = __copy_size; \
+__copy_res; })
+
+#define __copy_to_user(to,from,n) \
+ __copy_user((void *)(to), \
+ (void *)(from), n)
+
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+
+
+#define copy_from_user(to,from,n) ({ \
+void *__copy_to = (void *) (to); \
+void *__copy_from = (void *) (from); \
+__kernel_size_t __copy_size = (__kernel_size_t) (n); \
+__kernel_size_t __copy_res; \
+if(__copy_size && __access_ok((unsigned long)__copy_from, __copy_size)) { \
+__copy_res = __copy_user(__copy_to, __copy_from, __copy_size); \
+} else __copy_res = __copy_size; \
+__copy_res; })
+
+#define __copy_from_user(to,from,n) \
+ __copy_user((void *)(to), \
+ (void *)(from), n)
+
+/*
+ * Clear the area and return remaining number of bytes
+ * (on failure. Usually it's 0.)
+ */
+extern __kernel_size_t __clear_user(void *addr, __kernel_size_t size);
+
+#define clear_user(addr,n) ({ \
+void * __cl_addr = (addr); \
+unsigned long __cl_size = (n); \
+if (__cl_size && __access_ok(((unsigned long)(__cl_addr)), __cl_size)) \
+__cl_size = __clear_user(__cl_addr, __cl_size); \
+__cl_size; })
+
+static __inline__ int
+__strncpy_from_user(unsigned long __dest, unsigned long __user __src, int __count)
+{
+ __kernel_size_t res;
+ unsigned long __dummy, _d, _s;
+
+ __asm__ __volatile__(
+ "9:\n"
+ "mov.b @%2+, %1\n\t"
+ "cmp/eq #0, %1\n\t"
+ "bt/s 2f\n"
+ "1:\n"
+ "mov.b %1, @%3\n\t"
+ "dt %7\n\t"
+ "bf/s 9b\n\t"
+ " add #1, %3\n\t"
+ "2:\n\t"
+ "sub %7, %0\n"
+ "3:\n"
+ ".section .fixup,\"ax\"\n"
+ "4:\n\t"
+ "mov.l 5f, %1\n\t"
+ "jmp @%1\n\t"
+ " mov %8, %0\n\t"
+ ".balign 4\n"
+ "5: .long 3b\n"
+ ".previous\n"
+ ".section __ex_table,\"a\"\n"
+ " .balign 4\n"
+ " .long 9b,4b\n"
+ ".previous"
+ : "=r" (res), "=&z" (__dummy), "=r" (_s), "=r" (_d)
+ : "0" (__count), "2" (__src), "3" (__dest), "r" (__count),
+ "i" (-EFAULT)
+ : "memory", "t");
+
+ return res;
+}
+
+#define strncpy_from_user(dest,src,count) ({ \
+unsigned long __sfu_src = (unsigned long) (src); \
+int __sfu_count = (int) (count); \
+long __sfu_res = -EFAULT; \
+if(__access_ok(__sfu_src, __sfu_count)) { \
+__sfu_res = __strncpy_from_user((unsigned long) (dest), __sfu_src, __sfu_count); \
+} __sfu_res; })
+
+/*
+ * Return the size of a string (including the ending 0!)
+ */
+static __inline__ long __strnlen_user(const char __user *__s, long __n)
+{
+ unsigned long res;
+ unsigned long __dummy;
+
+ __asm__ __volatile__(
+ "9:\n"
+ "cmp/eq %4, %0\n\t"
+ "bt 2f\n"
+ "1:\t"
+ "mov.b @(%0,%3), %1\n\t"
+ "tst %1, %1\n\t"
+ "bf/s 9b\n\t"
+ " add #1, %0\n"
+ "2:\n"
+ ".section .fixup,\"ax\"\n"
+ "3:\n\t"
+ "mov.l 4f, %1\n\t"
+ "jmp @%1\n\t"
+ " mov %5, %0\n"
+ ".balign 4\n"
+ "4: .long 2b\n"
+ ".previous\n"
+ ".section __ex_table,\"a\"\n"
+ " .balign 4\n"
+ " .long 1b,3b\n"
+ ".previous"
+ : "=z" (res), "=&r" (__dummy)
+ : "0" (0), "r" (__s), "r" (__n), "i" (-EFAULT)
+ : "t");
+ return res;
+}
+
+static __inline__ long strnlen_user(const char __user *s, long n)
+{
+ if (!access_ok(VERIFY_READ, s, n))
+ return 0;
+ else
+ return __strnlen_user(s, n);
+}
+
+static __inline__ long strlen_user(const char __user *s)
+{
+ if (!access_ok(VERIFY_READ, s, 0))
+ return 0;
+ else
+ return __strnlen_user(s, ~0UL >> 1);
+}
+
+/*
+ * 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;
+};
+
+extern int fixup_exception(struct pt_regs *regs);
+
+#endif /* __ASM_SH_UACCESS_H */
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