[ARM] move include/asm-arm to arch/arm/include/asm

Move platform independent header files to arch/arm/include/asm, leaving
those in asm/arch* and asm/plat* alone.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 444 insertions, 0 deletions

diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h
new file mode 100644
index 00000000000..d0f51ff900b
--- /dev/null
+++ b/arch/arm/include/asm/uaccess.h
@@ -0,0 +1,444 @@
+/*
+ *  arch/arm/include/asm/uaccess.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef _ASMARM_UACCESS_H
+#define _ASMARM_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+#include <linux/sched.h>
+#include <asm/errno.h>
+#include <asm/memory.h>
+#include <asm/domain.h>
+#include <asm/system.h>
+
+#define VERIFY_READ 0
+#define VERIFY_WRITE 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);
+
+/*
+ * These two are intentionally not defined anywhere - if the kernel
+ * code generates any references to them, that's a bug.
+ */
+extern int __get_user_bad(void);
+extern int __put_user_bad(void);
+
+/*
+ * Note that this is actually 0x1,0000,0000
+ */
+#define KERNEL_DS	0x00000000
+#define get_ds()	(KERNEL_DS)
+
+#ifdef CONFIG_MMU
+
+#define USER_DS		TASK_SIZE
+#define get_fs()	(current_thread_info()->addr_limit)
+
+static inline void set_fs(mm_segment_t fs)
+{
+	current_thread_info()->addr_limit = fs;
+	modify_domain(DOMAIN_KERNEL, fs ? DOMAIN_CLIENT : DOMAIN_MANAGER);
+}
+
+#define segment_eq(a,b)	((a) == (b))
+
+#define __addr_ok(addr) ({ \
+	unsigned long flag; \
+	__asm__("cmp %2, %0; movlo %0, #0" \
+		: "=&r" (flag) \
+		: "0" (current_thread_info()->addr_limit), "r" (addr) \
+		: "cc"); \
+	(flag == 0); })
+
+/* We use 33-bit arithmetic here... */
+#define __range_ok(addr,size) ({ \
+	unsigned long flag, roksum; \
+	__chk_user_ptr(addr);	\
+	__asm__("adds %1, %2, %3; sbcccs %1, %1, %0; movcc %0, #0" \
+		: "=&r" (flag), "=&r" (roksum) \
+		: "r" (addr), "Ir" (size), "0" (current_thread_info()->addr_limit) \
+		: "cc"); \
+	flag; })
+
+/*
+ * Single-value transfer routines.  They automatically use the right
+ * size if we just have the right pointer type.  Note that the functions
+ * which read from user space (*get_*) need to take care not to leak
+ * kernel data even if the calling code is buggy and fails to check
+ * the return value.  This means zeroing out the destination variable
+ * or buffer on error.  Normally this is done out of line by the
+ * fixup code, but there are a few places where it intrudes on the
+ * main code path.  When we only write to user space, there is no
+ * problem.
+ */
+extern int __get_user_1(void *);
+extern int __get_user_2(void *);
+extern int __get_user_4(void *);
+
+#define __get_user_x(__r2,__p,__e,__s,__i...)				\
+	   __asm__ __volatile__ (					\
+		__asmeq("%0", "r0") __asmeq("%1", "r2")			\
+		"bl	__get_user_" #__s				\
+		: "=&r" (__e), "=r" (__r2)				\
+		: "0" (__p)						\
+		: __i, "cc")
+
+#define get_user(x,p)							\
+	({								\
+		register const typeof(*(p)) __user *__p asm("r0") = (p);\
+		register unsigned long __r2 asm("r2");			\
+		register int __e asm("r0");				\
+		switch (sizeof(*(__p))) {				\
+		case 1:							\
+			__get_user_x(__r2, __p, __e, 1, "lr");		\
+	       		break;						\
+		case 2:							\
+			__get_user_x(__r2, __p, __e, 2, "r3", "lr");	\
+			break;						\
+		case 4:							\
+	       		__get_user_x(__r2, __p, __e, 4, "lr");		\
+			break;						\
+		default: __e = __get_user_bad(); break;			\
+		}							\
+		x = (typeof(*(p))) __r2;				\
+		__e;							\
+	})
+
+extern int __put_user_1(void *, unsigned int);
+extern int __put_user_2(void *, unsigned int);
+extern int __put_user_4(void *, unsigned int);
+extern int __put_user_8(void *, unsigned long long);
+
+#define __put_user_x(__r2,__p,__e,__s)					\
+	   __asm__ __volatile__ (					\
+		__asmeq("%0", "r0") __asmeq("%2", "r2")			\
+		"bl	__put_user_" #__s				\
+		: "=&r" (__e)						\
+		: "0" (__p), "r" (__r2)					\
+		: "ip", "lr", "cc")
+
+#define put_user(x,p)							\
+	({								\
+		register const typeof(*(p)) __r2 asm("r2") = (x);	\
+		register const typeof(*(p)) __user *__p asm("r0") = (p);\
+		register int __e asm("r0");				\
+		switch (sizeof(*(__p))) {				\
+		case 1:							\
+			__put_user_x(__r2, __p, __e, 1);		\
+			break;						\
+		case 2:							\
+			__put_user_x(__r2, __p, __e, 2);		\
+			break;						\
+		case 4:							\
+			__put_user_x(__r2, __p, __e, 4);		\
+			break;						\
+		case 8:							\
+			__put_user_x(__r2, __p, __e, 8);		\
+			break;						\
+		default: __e = __put_user_bad(); break;			\
+		}							\
+		__e;							\
+	})
+
+#else /* CONFIG_MMU */
+
+/*
+ * uClinux has only one addr space, so has simplified address limits.
+ */
+#define USER_DS			KERNEL_DS
+
+#define segment_eq(a,b)		(1)
+#define __addr_ok(addr)		(1)
+#define __range_ok(addr,size)	(0)
+#define get_fs()		(KERNEL_DS)
+
+static inline void set_fs(mm_segment_t fs)
+{
+}
+
+#define get_user(x,p)	__get_user(x,p)
+#define put_user(x,p)	__put_user(x,p)
+
+#endif /* CONFIG_MMU */
+
+#define access_ok(type,addr,size)	(__range_ok(addr,size) == 0)
+
+/*
+ * The "__xxx" versions of the user access functions do not verify the
+ * address space - it must have been done previously with a separate
+ * "access_ok()" call.
+ *
+ * The "xxx_error" versions set the third argument to EFAULT if an
+ * error occurs, and leave it unchanged on success.  Note that these
+ * versions are void (ie, don't return a value as such).
+ */
+#define __get_user(x,ptr)						\
+({									\
+	long __gu_err = 0;						\
+	__get_user_err((x),(ptr),__gu_err);				\
+	__gu_err;							\
+})
+
+#define __get_user_error(x,ptr,err)					\
+({									\
+	__get_user_err((x),(ptr),err);					\
+	(void) 0;							\
+})
+
+#define __get_user_err(x,ptr,err)					\
+do {									\
+	unsigned long __gu_addr = (unsigned long)(ptr);			\
+	unsigned long __gu_val;						\
+	__chk_user_ptr(ptr);						\
+	switch (sizeof(*(ptr))) {					\
+	case 1:	__get_user_asm_byte(__gu_val,__gu_addr,err);	break;	\
+	case 2:	__get_user_asm_half(__gu_val,__gu_addr,err);	break;	\
+	case 4:	__get_user_asm_word(__gu_val,__gu_addr,err);	break;	\
+	default: (__gu_val) = __get_user_bad();				\
+	}								\
+	(x) = (__typeof__(*(ptr)))__gu_val;				\
+} while (0)
+
+#define __get_user_asm_byte(x,addr,err)				\
+	__asm__ __volatile__(					\
+	"1:	ldrbt	%1,[%2],#0\n"				\
+	"2:\n"							\
+	"	.section .fixup,\"ax\"\n"			\
+	"	.align	2\n"					\
+	"3:	mov	%0, %3\n"				\
+	"	mov	%1, #0\n"				\
+	"	b	2b\n"					\
+	"	.previous\n"					\
+	"	.section __ex_table,\"a\"\n"			\
+	"	.align	3\n"					\
+	"	.long	1b, 3b\n"				\
+	"	.previous"					\
+	: "+r" (err), "=&r" (x)					\
+	: "r" (addr), "i" (-EFAULT)				\
+	: "cc")
+
+#ifndef __ARMEB__
+#define __get_user_asm_half(x,__gu_addr,err)			\
+({								\
+	unsigned long __b1, __b2;				\
+	__get_user_asm_byte(__b1, __gu_addr, err);		\
+	__get_user_asm_byte(__b2, __gu_addr + 1, err);		\
+	(x) = __b1 | (__b2 << 8);				\
+})
+#else
+#define __get_user_asm_half(x,__gu_addr,err)			\
+({								\
+	unsigned long __b1, __b2;				\
+	__get_user_asm_byte(__b1, __gu_addr, err);		\
+	__get_user_asm_byte(__b2, __gu_addr + 1, err);		\
+	(x) = (__b1 << 8) | __b2;				\
+})
+#endif
+
+#define __get_user_asm_word(x,addr,err)				\
+	__asm__ __volatile__(					\
+	"1:	ldrt	%1,[%2],#0\n"				\
+	"2:\n"							\
+	"	.section .fixup,\"ax\"\n"			\
+	"	.align	2\n"					\
+	"3:	mov	%0, %3\n"				\
+	"	mov	%1, #0\n"				\
+	"	b	2b\n"					\
+	"	.previous\n"					\
+	"	.section __ex_table,\"a\"\n"			\
+	"	.align	3\n"					\
+	"	.long	1b, 3b\n"				\
+	"	.previous"					\
+	: "+r" (err), "=&r" (x)					\
+	: "r" (addr), "i" (-EFAULT)				\
+	: "cc")
+
+#define __put_user(x,ptr)						\
+({									\
+	long __pu_err = 0;						\
+	__put_user_err((x),(ptr),__pu_err);				\
+	__pu_err;							\
+})
+
+#define __put_user_error(x,ptr,err)					\
+({									\
+	__put_user_err((x),(ptr),err);					\
+	(void) 0;							\
+})
+
+#define __put_user_err(x,ptr,err)					\
+do {									\
+	unsigned long __pu_addr = (unsigned long)(ptr);			\
+	__typeof__(*(ptr)) __pu_val = (x);				\
+	__chk_user_ptr(ptr);						\
+	switch (sizeof(*(ptr))) {					\
+	case 1: __put_user_asm_byte(__pu_val,__pu_addr,err);	break;	\
+	case 2: __put_user_asm_half(__pu_val,__pu_addr,err);	break;	\
+	case 4: __put_user_asm_word(__pu_val,__pu_addr,err);	break;	\
+	case 8:	__put_user_asm_dword(__pu_val,__pu_addr,err);	break;	\
+	default: __put_user_bad();					\
+	}								\
+} while (0)
+
+#define __put_user_asm_byte(x,__pu_addr,err)			\
+	__asm__ __volatile__(					\
+	"1:	strbt	%1,[%2],#0\n"				\
+	"2:\n"							\
+	"	.section .fixup,\"ax\"\n"			\
+	"	.align	2\n"					\
+	"3:	mov	%0, %3\n"				\
+	"	b	2b\n"					\
+	"	.previous\n"					\
+	"	.section __ex_table,\"a\"\n"			\
+	"	.align	3\n"					\
+	"	.long	1b, 3b\n"				\
+	"	.previous"					\
+	: "+r" (err)						\
+	: "r" (x), "r" (__pu_addr), "i" (-EFAULT)		\
+	: "cc")
+
+#ifndef __ARMEB__
+#define __put_user_asm_half(x,__pu_addr,err)			\
+({								\
+	unsigned long __temp = (unsigned long)(x);		\
+	__put_user_asm_byte(__temp, __pu_addr, err);		\
+	__put_user_asm_byte(__temp >> 8, __pu_addr + 1, err);	\
+})
+#else
+#define __put_user_asm_half(x,__pu_addr,err)			\
+({								\
+	unsigned long __temp = (unsigned long)(x);		\
+	__put_user_asm_byte(__temp >> 8, __pu_addr, err);	\
+	__put_user_asm_byte(__temp, __pu_addr + 1, err);	\
+})
+#endif
+
+#define __put_user_asm_word(x,__pu_addr,err)			\
+	__asm__ __volatile__(					\
+	"1:	strt	%1,[%2],#0\n"				\
+	"2:\n"							\
+	"	.section .fixup,\"ax\"\n"			\
+	"	.align	2\n"					\
+	"3:	mov	%0, %3\n"				\
+	"	b	2b\n"					\
+	"	.previous\n"					\
+	"	.section __ex_table,\"a\"\n"			\
+	"	.align	3\n"					\
+	"	.long	1b, 3b\n"				\
+	"	.previous"					\
+	: "+r" (err)						\
+	: "r" (x), "r" (__pu_addr), "i" (-EFAULT)		\
+	: "cc")
+
+#ifndef __ARMEB__
+#define	__reg_oper0	"%R2"
+#define	__reg_oper1	"%Q2"
+#else
+#define	__reg_oper0	"%Q2"
+#define	__reg_oper1	"%R2"
+#endif
+
+#define __put_user_asm_dword(x,__pu_addr,err)			\
+	__asm__ __volatile__(					\
+	"1:	strt	" __reg_oper1 ", [%1], #4\n"		\
+	"2:	strt	" __reg_oper0 ", [%1], #0\n"		\
+	"3:\n"							\
+	"	.section .fixup,\"ax\"\n"			\
+	"	.align	2\n"					\
+	"4:	mov	%0, %3\n"				\
+	"	b	3b\n"					\
+	"	.previous\n"					\
+	"	.section __ex_table,\"a\"\n"			\
+	"	.align	3\n"					\
+	"	.long	1b, 4b\n"				\
+	"	.long	2b, 4b\n"				\
+	"	.previous"					\
+	: "+r" (err), "+r" (__pu_addr)				\
+	: "r" (x), "i" (-EFAULT)				\
+	: "cc")
+
+
+#ifdef CONFIG_MMU
+extern unsigned long __must_check __copy_from_user(void *to, const void __user *from, unsigned long n);
+extern unsigned long __must_check __copy_to_user(void __user *to, const void *from, unsigned long n);
+extern unsigned long __must_check __clear_user(void __user *addr, unsigned long n);
+#else
+#define __copy_from_user(to,from,n)	(memcpy(to, (void __force *)from, n), 0)
+#define __copy_to_user(to,from,n)	(memcpy((void __force *)to, from, n), 0)
+#define __clear_user(addr,n)		(memset((void __force *)addr, 0, n), 0)
+#endif
+
+extern unsigned long __must_check __strncpy_from_user(char *to, const char __user *from, unsigned long count);
+extern unsigned long __must_check __strnlen_user(const char __user *s, long n);
+
+static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+	if (access_ok(VERIFY_READ, from, n))
+		n = __copy_from_user(to, from, n);
+	else /* security hole - plug it */
+		memzero(to, n);
+	return n;
+}
+
+static inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+	if (access_ok(VERIFY_WRITE, to, n))
+		n = __copy_to_user(to, from, n);
+	return n;
+}
+
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+
+static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
+{
+	if (access_ok(VERIFY_WRITE, to, n))
+		n = __clear_user(to, n);
+	return n;
+}
+
+static inline long __must_check strncpy_from_user(char *dst, const char __user *src, long count)
+{
+	long res = -EFAULT;
+	if (access_ok(VERIFY_READ, src, 1))
+		res = __strncpy_from_user(dst, src, count);
+	return res;
+}
+
+#define strlen_user(s)	strnlen_user(s, ~0UL >> 1)
+
+static inline long __must_check strnlen_user(const char __user *s, long n)
+{
+	unsigned long res = 0;
+
+	if (__addr_ok(s))
+		res = __strnlen_user(s, n);
+
+	return res;
+}
+
+#endif /* _ASMARM_UACCESS_H */