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authorBryan Wu <cooloney@kernel.org>2008-08-27 10:51:02 +0800
committerBryan Wu <cooloney@kernel.org>2008-08-27 10:51:02 +0800
commit639f6571458948b5112be2cf00c0c2c04db2897d (patch)
treea4dd7af33d0e92c935ba1e904f6fb7e923ac825e /arch/blackfin/include/asm/uaccess.h
parent3d9b7a5ce534f3963afcf8f4777267e5899fe007 (diff)
downloadlinux-2.6.38-lt-ux500-639f6571458948b5112be2cf00c0c2c04db2897d.tar.gz
Blackfin arch: move include/asm-blackfin header files to arch/blackfin
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Diffstat (limited to 'arch/blackfin/include/asm/uaccess.h')
-rw-r--r--arch/blackfin/include/asm/uaccess.h271
1 files changed, 271 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/uaccess.h b/arch/blackfin/include/asm/uaccess.h
new file mode 100644
index 00000000000..d928b809905
--- /dev/null
+++ b/arch/blackfin/include/asm/uaccess.h
@@ -0,0 +1,271 @@
+/* Changes made by Lineo Inc. May 2001
+ *
+ * Based on: include/asm-m68knommu/uaccess.h
+ */
+
+#ifndef __BLACKFIN_UACCESS_H
+#define __BLACKFIN_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+
+#include <asm/segment.h>
+#ifdef CONFIG_ACCESS_CHECK
+# include <asm/bfin-global.h>
+#endif
+
+#define get_ds() (KERNEL_DS)
+#define get_fs() (current_thread_info()->addr_limit)
+
+static inline void set_fs(mm_segment_t fs)
+{
+ current_thread_info()->addr_limit = fs;
+}
+
+#define segment_eq(a,b) ((a) == (b))
+
+#define VERIFY_READ 0
+#define VERIFY_WRITE 1
+
+#define access_ok(type, addr, size) _access_ok((unsigned long)(addr), (size))
+
+static inline int is_in_rom(unsigned long addr)
+{
+ /*
+ * What we are really trying to do is determine if addr is
+ * in an allocated kernel memory region. If not then assume
+ * we cannot free it or otherwise de-allocate it. Ideally
+ * we could restrict this to really being in a ROM or flash,
+ * but that would need to be done on a board by board basis,
+ * not globally.
+ */
+ if ((addr < _ramstart) || (addr >= _ramend))
+ return (1);
+
+ /* Default case, not in ROM */
+ return (0);
+}
+
+/*
+ * 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.
+ */
+
+#ifndef CONFIG_ACCESS_CHECK
+static inline int _access_ok(unsigned long addr, unsigned long size) { return 1; }
+#else
+#ifdef CONFIG_ACCESS_OK_L1
+extern int _access_ok(unsigned long addr, unsigned long size)__attribute__((l1_text));
+#else
+extern int _access_ok(unsigned long addr, unsigned long size);
+#endif
+#endif
+
+/*
+ * 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;
+};
+
+/* Returns 0 if exception not found and fixup otherwise. */
+extern unsigned long search_exception_table(unsigned long);
+
+/*
+ * These are the main single-value transfer routines. They automatically
+ * use the right size if we just have the right pointer type.
+ */
+
+#define put_user(x,p) \
+ ({ \
+ int _err = 0; \
+ typeof(*(p)) _x = (x); \
+ typeof(*(p)) *_p = (p); \
+ if (!access_ok(VERIFY_WRITE, _p, sizeof(*(_p)))) {\
+ _err = -EFAULT; \
+ } \
+ else { \
+ switch (sizeof (*(_p))) { \
+ case 1: \
+ __put_user_asm(_x, _p, B); \
+ break; \
+ case 2: \
+ __put_user_asm(_x, _p, W); \
+ break; \
+ case 4: \
+ __put_user_asm(_x, _p, ); \
+ break; \
+ case 8: { \
+ long _xl, _xh; \
+ _xl = ((long *)&_x)[0]; \
+ _xh = ((long *)&_x)[1]; \
+ __put_user_asm(_xl, ((long *)_p)+0, ); \
+ __put_user_asm(_xh, ((long *)_p)+1, ); \
+ } break; \
+ default: \
+ _err = __put_user_bad(); \
+ break; \
+ } \
+ } \
+ _err; \
+ })
+
+#define __put_user(x,p) put_user(x,p)
+static inline int bad_user_access_length(void)
+{
+ panic("bad_user_access_length");
+ return -1;
+}
+
+#define __put_user_bad() (printk(KERN_INFO "put_user_bad %s:%d %s\n",\
+ __FILE__, __LINE__, __func__),\
+ bad_user_access_length(), (-EFAULT))
+
+/*
+ * Tell gcc we read from memory instead of writing: this is because
+ * we do not write to any memory gcc knows about, so there are no
+ * aliasing issues.
+ */
+
+#define __ptr(x) ((unsigned long *)(x))
+
+#define __put_user_asm(x,p,bhw) \
+ __asm__ (#bhw"[%1] = %0;\n\t" \
+ : /* no outputs */ \
+ :"d" (x),"a" (__ptr(p)) : "memory")
+
+#define get_user(x,p) \
+ ({ \
+ int _err = 0; \
+ typeof(*(p)) *_p = (p); \
+ if (!access_ok(VERIFY_READ, _p, sizeof(*(_p)))) { \
+ _err = -EFAULT; \
+ } \
+ else { \
+ switch (sizeof(*(_p))) { \
+ case 1: \
+ __get_user_asm(x, _p, B,(Z)); \
+ break; \
+ case 2: \
+ __get_user_asm(x, _p, W,(Z)); \
+ break; \
+ case 4: \
+ __get_user_asm(x, _p, , ); \
+ break; \
+ case 8: { \
+ unsigned long _xl, _xh; \
+ __get_user_asm(_xl, ((unsigned long *)_p)+0, , ); \
+ __get_user_asm(_xh, ((unsigned long *)_p)+1, , ); \
+ ((unsigned long *)&x)[0] = _xl; \
+ ((unsigned long *)&x)[1] = _xh; \
+ } break; \
+ default: \
+ x = 0; \
+ printk(KERN_INFO "get_user_bad: %s:%d %s\n", \
+ __FILE__, __LINE__, __func__); \
+ _err = __get_user_bad(); \
+ break; \
+ } \
+ } \
+ _err; \
+ })
+
+#define __get_user(x,p) get_user(x,p)
+
+#define __get_user_bad() (bad_user_access_length(), (-EFAULT))
+
+#define __get_user_asm(x,p,bhw,option) \
+ { \
+ unsigned long _tmp; \
+ __asm__ ("%0 =" #bhw "[%1]"#option";\n\t" \
+ : "=d" (_tmp) \
+ : "a" (__ptr(p))); \
+ (x) = (__typeof__(*(p))) _tmp; \
+ }
+
+#define __copy_from_user(to, from, n) copy_from_user(to, from, n)
+#define __copy_to_user(to, from, n) copy_to_user(to, from, n)
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+
+#define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n))\
+ return retval; })
+
+#define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n))\
+ return retval; })
+
+static inline long copy_from_user(void *to,
+ const void __user * from, unsigned long n)
+{
+ if (access_ok(VERIFY_READ, from, n))
+ memcpy(to, from, n);
+ else
+ return n;
+ return 0;
+}
+
+static inline long copy_to_user(void *to,
+ const void __user * from, unsigned long n)
+{
+ if (access_ok(VERIFY_WRITE, to, n))
+ memcpy(to, from, n);
+ else
+ return n;
+ return 0;
+}
+
+/*
+ * Copy a null terminated string from userspace.
+ */
+
+static inline long strncpy_from_user(char *dst,
+ const char *src, long count)
+{
+ char *tmp;
+ if (!access_ok(VERIFY_READ, src, 1))
+ return -EFAULT;
+ strncpy(dst, src, count);
+ for (tmp = dst; *tmp && count > 0; tmp++, count--) ;
+ return (tmp - dst);
+}
+
+/*
+ * Return the size of a string (including the ending 0)
+ *
+ * Return 0 on exception, a value greater than N if too long
+ */
+static inline long strnlen_user(const char *src, long n)
+{
+ return (strlen(src) + 1);
+}
+
+#define strlen_user(str) strnlen_user(str, 32767)
+
+/*
+ * Zero Userspace
+ */
+
+static inline unsigned long __clear_user(void *to, unsigned long n)
+{
+ memset(to, 0, n);
+ return 0;
+}
+
+#define clear_user(to, n) __clear_user(to, n)
+
+#endif /* _BLACKFIN_UACCESS_H */