parisc: move include/asm-parisc to arch/parisc/include/asm

1 files changed, 244 insertions, 0 deletions

diff --git a/arch/parisc/include/asm/uaccess.h b/arch/parisc/include/asm/uaccess.h
new file mode 100644
index 00000000000..4878b9501f2
--- /dev/null
+++ b/arch/parisc/include/asm/uaccess.h
@@ -0,0 +1,244 @@
+#ifndef __PARISC_UACCESS_H
+#define __PARISC_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+#include <asm/page.h>
+#include <asm/system.h>
+#include <asm/cache.h>
+#include <asm-generic/uaccess.h>
+
+#define VERIFY_READ 0
+#define VERIFY_WRITE 1
+
+#define KERNEL_DS	((mm_segment_t){0})
+#define USER_DS 	((mm_segment_t){1})
+
+#define segment_eq(a,b)	((a).seg == (b).seg)
+
+#define get_ds()	(KERNEL_DS)
+#define get_fs()	(current_thread_info()->addr_limit)
+#define set_fs(x)	(current_thread_info()->addr_limit = (x))
+
+/*
+ * Note that since kernel addresses are in a separate address space on
+ * parisc, we don't need to do anything for access_ok().
+ * We just let the page fault handler do the right thing. This also means
+ * that put_user is the same as __put_user, etc.
+ */
+
+extern int __get_kernel_bad(void);
+extern int __get_user_bad(void);
+extern int __put_kernel_bad(void);
+extern int __put_user_bad(void);
+
+static inline long access_ok(int type, const void __user * addr,
+		unsigned long size)
+{
+	return 1;
+}
+
+#define put_user __put_user
+#define get_user __get_user
+
+#if !defined(CONFIG_64BIT)
+#define LDD_KERNEL(ptr)		__get_kernel_bad();
+#define LDD_USER(ptr)		__get_user_bad();
+#define STD_KERNEL(x, ptr)	__put_kernel_asm64(x,ptr)
+#define STD_USER(x, ptr)	__put_user_asm64(x,ptr)
+#define ASM_WORD_INSN		".word\t"
+#else
+#define LDD_KERNEL(ptr)		__get_kernel_asm("ldd",ptr)
+#define LDD_USER(ptr)		__get_user_asm("ldd",ptr)
+#define STD_KERNEL(x, ptr)	__put_kernel_asm("std",x,ptr)
+#define STD_USER(x, ptr)	__put_user_asm("std",x,ptr)
+#define ASM_WORD_INSN		".dword\t"
+#endif
+
+/*
+ * The exception table contains two values: the first is an address
+ * for an instruction that is allowed to fault, and the second is
+ * the address to the fixup routine. 
+ */
+
+struct exception_table_entry {
+	unsigned long insn;  /* address of insn that is allowed to fault.   */
+	long fixup;          /* fixup routine */
+};
+
+#define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\
+	".section __ex_table,\"aw\"\n"			   \
+	ASM_WORD_INSN #fault_addr ", " #except_addr "\n\t" \
+	".previous\n"
+
+/*
+ * The page fault handler stores, in a per-cpu area, the following information
+ * if a fixup routine is available.
+ */
+struct exception_data {
+	unsigned long fault_ip;
+	unsigned long fault_space;
+	unsigned long fault_addr;
+};
+
+#define __get_user(x,ptr)                               \
+({                                                      \
+	register long __gu_err __asm__ ("r8") = 0;      \
+	register long __gu_val __asm__ ("r9") = 0;      \
+							\
+	if (segment_eq(get_fs(),KERNEL_DS)) {           \
+	    switch (sizeof(*(ptr))) {                   \
+	    case 1: __get_kernel_asm("ldb",ptr); break; \
+	    case 2: __get_kernel_asm("ldh",ptr); break; \
+	    case 4: __get_kernel_asm("ldw",ptr); break; \
+	    case 8: LDD_KERNEL(ptr); break;		\
+	    default: __get_kernel_bad(); break;         \
+	    }                                           \
+	}                                               \
+	else {                                          \
+	    switch (sizeof(*(ptr))) {                   \
+	    case 1: __get_user_asm("ldb",ptr); break;   \
+	    case 2: __get_user_asm("ldh",ptr); break;   \
+	    case 4: __get_user_asm("ldw",ptr); break;   \
+	    case 8: LDD_USER(ptr);  break;		\
+	    default: __get_user_bad(); break;           \
+	    }                                           \
+	}                                               \
+							\
+	(x) = (__typeof__(*(ptr))) __gu_val;            \
+	__gu_err;                                       \
+})
+
+#define __get_kernel_asm(ldx,ptr)                       \
+	__asm__("\n1:\t" ldx "\t0(%2),%0\n\t"		\
+		ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_1)\
+		: "=r"(__gu_val), "=r"(__gu_err)        \
+		: "r"(ptr), "1"(__gu_err)		\
+		: "r1");
+
+#define __get_user_asm(ldx,ptr)                         \
+	__asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n\t"	\
+		ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_get_user_skip_1)\
+		: "=r"(__gu_val), "=r"(__gu_err)        \
+		: "r"(ptr), "1"(__gu_err)		\
+		: "r1");
+
+#define __put_user(x,ptr)                                       \
+({								\
+	register long __pu_err __asm__ ("r8") = 0;      	\
+        __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x);	\
+								\
+	if (segment_eq(get_fs(),KERNEL_DS)) {                   \
+	    switch (sizeof(*(ptr))) {                           \
+	    case 1: __put_kernel_asm("stb",__x,ptr); break;     \
+	    case 2: __put_kernel_asm("sth",__x,ptr); break;     \
+	    case 4: __put_kernel_asm("stw",__x,ptr); break;     \
+	    case 8: STD_KERNEL(__x,ptr); break;			\
+	    default: __put_kernel_bad(); break;			\
+	    }                                                   \
+	}                                                       \
+	else {                                                  \
+	    switch (sizeof(*(ptr))) {                           \
+	    case 1: __put_user_asm("stb",__x,ptr); break;       \
+	    case 2: __put_user_asm("sth",__x,ptr); break;       \
+	    case 4: __put_user_asm("stw",__x,ptr); break;       \
+	    case 8: STD_USER(__x,ptr); break;			\
+	    default: __put_user_bad(); break;			\
+	    }                                                   \
+	}                                                       \
+								\
+	__pu_err;						\
+})
+
+/*
+ * The "__put_user/kernel_asm()" macros tell gcc they read from memory
+ * instead of writing. This is because they do not write to any memory
+ * gcc knows about, so there are no aliasing issues. These macros must
+ * also be aware that "fixup_put_user_skip_[12]" are executed in the
+ * context of the fault, and any registers used there must be listed
+ * as clobbers. In this case only "r1" is used by the current routines.
+ * r8/r9 are already listed as err/val.
+ */
+
+#define __put_kernel_asm(stx,x,ptr)                         \
+	__asm__ __volatile__ (                              \
+		"\n1:\t" stx "\t%2,0(%1)\n\t"		    \
+		ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
+		: "=r"(__pu_err)                            \
+		: "r"(ptr), "r"(x), "0"(__pu_err)	    \
+	    	: "r1")
+
+#define __put_user_asm(stx,x,ptr)                           \
+	__asm__ __volatile__ (                              \
+		"\n1:\t" stx "\t%2,0(%%sr3,%1)\n\t"	    \
+		ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
+		: "=r"(__pu_err)                            \
+		: "r"(ptr), "r"(x), "0"(__pu_err)	    \
+		: "r1")
+
+
+#if !defined(CONFIG_64BIT)
+
+#define __put_kernel_asm64(__val,ptr) do {		    \
+	u64 __val64 = (u64)(__val);			    \
+	u32 hi = (__val64) >> 32;			    \
+	u32 lo = (__val64) & 0xffffffff;		    \
+	__asm__ __volatile__ (				    \
+		"\n1:\tstw %2,0(%1)"			    \
+		"\n2:\tstw %3,4(%1)\n\t"		    \
+		ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\
+		ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\
+		: "=r"(__pu_err)                            \
+		: "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
+		: "r1");				    \
+} while (0)
+
+#define __put_user_asm64(__val,ptr) do {	    	    \
+	u64 __val64 = (u64)(__val);			    \
+	u32 hi = (__val64) >> 32;			    \
+	u32 lo = (__val64) & 0xffffffff;		    \
+	__asm__ __volatile__ (				    \
+		"\n1:\tstw %2,0(%%sr3,%1)"		    \
+		"\n2:\tstw %3,4(%%sr3,%1)\n\t"		    \
+		ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\
+		ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\
+		: "=r"(__pu_err)                            \
+		: "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
+		: "r1");				    \
+} while (0)
+
+#endif /* !defined(CONFIG_64BIT) */
+
+
+/*
+ * Complex access routines -- external declarations
+ */
+
+extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long);
+extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long);
+extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long);
+extern long lstrncpy_from_user(char *, const char __user *, long);
+extern unsigned lclear_user(void __user *,unsigned long);
+extern long lstrnlen_user(const char __user *,long);
+
+/*
+ * Complex access routines -- macros
+ */
+
+#define strncpy_from_user lstrncpy_from_user
+#define strnlen_user lstrnlen_user
+#define strlen_user(str) lstrnlen_user(str, 0x7fffffffL)
+#define clear_user lclear_user
+#define __clear_user lclear_user
+
+unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len);
+#define __copy_to_user copy_to_user
+unsigned long copy_from_user(void *dst, const void __user *src, unsigned long len);
+#define __copy_from_user copy_from_user
+unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len);
+#define __copy_in_user copy_in_user
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+
+#endif /* __PARISC_UACCESS_H */