Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 292 insertions, 0 deletions

diff --git a/arch/alpha/include/asm/uaccess.h b/arch/alpha/include/asm/uaccess.h
new file mode 100644
index 000000000..c32c2584c
--- /dev/null
+++ b/arch/alpha/include/asm/uaccess.h
@@ -0,0 +1,292 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ALPHA_UACCESS_H
+#define __ALPHA_UACCESS_H
+
+#include <asm-generic/access_ok.h>
+/*
+ * 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_check((__typeof__(*(ptr)))(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 programmer 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)))
+  
+/*
+ * The "lda %1, 2b-1b(%0)" bits are magic to get the assembler to
+ * encode the bits we need for resolving the exception.  See the
+ * more extensive comments with fixup_inline_exception below for
+ * more information.
+ */
+#define EXC(label,cont,res,err)				\
+	".section __ex_table,\"a\"\n"			\
+	"	.long "#label"-.\n"			\
+	"	lda "#res","#cont"-"#label"("#err")\n"	\
+	".previous\n"
+
+extern void __get_user_unknown(void);
+
+#define __get_user_nocheck(x, ptr, size)			\
+({								\
+	long __gu_err = 0;					\
+	unsigned long __gu_val;					\
+	__chk_user_ptr(ptr);					\
+	switch (size) {						\
+	  case 1: __get_user_8(ptr); break;			\
+	  case 2: __get_user_16(ptr); break;			\
+	  case 4: __get_user_32(ptr); break;			\
+	  case 8: __get_user_64(ptr); break;			\
+	  default: __get_user_unknown(); break;			\
+	}							\
+	(x) = (__force __typeof__(*(ptr))) __gu_val;		\
+	__gu_err;						\
+})
+
+#define __get_user_check(x, ptr, size)				\
+({								\
+	long __gu_err = -EFAULT;				\
+	unsigned long __gu_val = 0;				\
+	const __typeof__(*(ptr)) __user *__gu_addr = (ptr);	\
+	if (__access_ok(__gu_addr, size)) {			\
+		__gu_err = 0;					\
+		switch (size) {					\
+		  case 1: __get_user_8(__gu_addr); break;	\
+		  case 2: __get_user_16(__gu_addr); break;	\
+		  case 4: __get_user_32(__gu_addr); break;	\
+		  case 8: __get_user_64(__gu_addr); break;	\
+		  default: __get_user_unknown(); break;		\
+		}						\
+	}							\
+	(x) = (__force __typeof__(*(ptr))) __gu_val;		\
+	__gu_err;						\
+})
+
+struct __large_struct { unsigned long buf[100]; };
+#define __m(x) (*(struct __large_struct __user *)(x))
+
+#define __get_user_64(addr)				\
+	__asm__("1: ldq %0,%2\n"			\
+	"2:\n"						\
+	EXC(1b,2b,%0,%1)				\
+		: "=r"(__gu_val), "=r"(__gu_err)	\
+		: "m"(__m(addr)), "1"(__gu_err))
+
+#define __get_user_32(addr)				\
+	__asm__("1: ldl %0,%2\n"			\
+	"2:\n"						\
+	EXC(1b,2b,%0,%1)				\
+		: "=r"(__gu_val), "=r"(__gu_err)	\
+		: "m"(__m(addr)), "1"(__gu_err))
+
+#ifdef __alpha_bwx__
+/* Those lucky bastards with ev56 and later CPUs can do byte/word moves.  */
+
+#define __get_user_16(addr)				\
+	__asm__("1: ldwu %0,%2\n"			\
+	"2:\n"						\
+	EXC(1b,2b,%0,%1)				\
+		: "=r"(__gu_val), "=r"(__gu_err)	\
+		: "m"(__m(addr)), "1"(__gu_err))
+
+#define __get_user_8(addr)				\
+	__asm__("1: ldbu %0,%2\n"			\
+	"2:\n"						\
+	EXC(1b,2b,%0,%1)				\
+		: "=r"(__gu_val), "=r"(__gu_err)	\
+		: "m"(__m(addr)), "1"(__gu_err))
+#else
+/* Unfortunately, we can't get an unaligned access trap for the sub-word
+   load, so we have to do a general unaligned operation.  */
+
+#define __get_user_16(addr)						\
+{									\
+	long __gu_tmp;							\
+	__asm__("1: ldq_u %0,0(%3)\n"					\
+	"2:	ldq_u %1,1(%3)\n"					\
+	"	extwl %0,%3,%0\n"					\
+	"	extwh %1,%3,%1\n"					\
+	"	or %0,%1,%0\n"						\
+	"3:\n"								\
+	EXC(1b,3b,%0,%2)						\
+	EXC(2b,3b,%0,%2)						\
+		: "=&r"(__gu_val), "=&r"(__gu_tmp), "=r"(__gu_err)	\
+		: "r"(addr), "2"(__gu_err));				\
+}
+
+#define __get_user_8(addr)						\
+	__asm__("1: ldq_u %0,0(%2)\n"					\
+	"	extbl %0,%2,%0\n"					\
+	"2:\n"								\
+	EXC(1b,2b,%0,%1)						\
+		: "=&r"(__gu_val), "=r"(__gu_err)			\
+		: "r"(addr), "1"(__gu_err))
+#endif
+
+extern void __put_user_unknown(void);
+
+#define __put_user_nocheck(x, ptr, size)			\
+({								\
+	long __pu_err = 0;					\
+	__chk_user_ptr(ptr);					\
+	switch (size) {						\
+	  case 1: __put_user_8(x, ptr); break;			\
+	  case 2: __put_user_16(x, ptr); break;			\
+	  case 4: __put_user_32(x, ptr); break;			\
+	  case 8: __put_user_64(x, ptr); break;			\
+	  default: __put_user_unknown(); break;			\
+	}							\
+	__pu_err;						\
+})
+
+#define __put_user_check(x, ptr, size)				\
+({								\
+	long __pu_err = -EFAULT;				\
+	__typeof__(*(ptr)) __user *__pu_addr = (ptr);		\
+	if (__access_ok(__pu_addr, size)) {			\
+		__pu_err = 0;					\
+		switch (size) {					\
+		  case 1: __put_user_8(x, __pu_addr); break;	\
+		  case 2: __put_user_16(x, __pu_addr); break;	\
+		  case 4: __put_user_32(x, __pu_addr); break;	\
+		  case 8: __put_user_64(x, __pu_addr); break;	\
+		  default: __put_user_unknown(); break;		\
+		}						\
+	}							\
+	__pu_err;						\
+})
+
+/*
+ * The "__put_user_xx()" 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
+ */
+#define __put_user_64(x, addr)					\
+__asm__ __volatile__("1: stq %r2,%1\n"				\
+	"2:\n"							\
+	EXC(1b,2b,$31,%0)					\
+		: "=r"(__pu_err)				\
+		: "m" (__m(addr)), "rJ" (x), "0"(__pu_err))
+
+#define __put_user_32(x, addr)					\
+__asm__ __volatile__("1: stl %r2,%1\n"				\
+	"2:\n"							\
+	EXC(1b,2b,$31,%0)					\
+		: "=r"(__pu_err)				\
+		: "m"(__m(addr)), "rJ"(x), "0"(__pu_err))
+
+#ifdef __alpha_bwx__
+/* Those lucky bastards with ev56 and later CPUs can do byte/word moves.  */
+
+#define __put_user_16(x, addr)					\
+__asm__ __volatile__("1: stw %r2,%1\n"				\
+	"2:\n"							\
+	EXC(1b,2b,$31,%0)					\
+		: "=r"(__pu_err)				\
+		: "m"(__m(addr)), "rJ"(x), "0"(__pu_err))
+
+#define __put_user_8(x, addr)					\
+__asm__ __volatile__("1: stb %r2,%1\n"				\
+	"2:\n"							\
+	EXC(1b,2b,$31,%0)					\
+		: "=r"(__pu_err)				\
+		: "m"(__m(addr)), "rJ"(x), "0"(__pu_err))
+#else
+/* Unfortunately, we can't get an unaligned access trap for the sub-word
+   write, so we have to do a general unaligned operation.  */
+
+#define __put_user_16(x, addr)					\
+{								\
+	long __pu_tmp1, __pu_tmp2, __pu_tmp3, __pu_tmp4;	\
+	__asm__ __volatile__(					\
+	"1:	ldq_u %2,1(%5)\n"				\
+	"2:	ldq_u %1,0(%5)\n"				\
+	"	inswh %6,%5,%4\n"				\
+	"	inswl %6,%5,%3\n"				\
+	"	mskwh %2,%5,%2\n"				\
+	"	mskwl %1,%5,%1\n"				\
+	"	or %2,%4,%2\n"					\
+	"	or %1,%3,%1\n"					\
+	"3:	stq_u %2,1(%5)\n"				\
+	"4:	stq_u %1,0(%5)\n"				\
+	"5:\n"							\
+	EXC(1b,5b,$31,%0)					\
+	EXC(2b,5b,$31,%0)					\
+	EXC(3b,5b,$31,%0)					\
+	EXC(4b,5b,$31,%0)					\
+		: "=r"(__pu_err), "=&r"(__pu_tmp1), 		\
+		  "=&r"(__pu_tmp2), "=&r"(__pu_tmp3), 		\
+		  "=&r"(__pu_tmp4)				\
+		: "r"(addr), "r"((unsigned long)(x)), "0"(__pu_err)); \
+}
+
+#define __put_user_8(x, addr)					\
+{								\
+	long __pu_tmp1, __pu_tmp2;				\
+	__asm__ __volatile__(					\
+	"1:	ldq_u %1,0(%4)\n"				\
+	"	insbl %3,%4,%2\n"				\
+	"	mskbl %1,%4,%1\n"				\
+	"	or %1,%2,%1\n"					\
+	"2:	stq_u %1,0(%4)\n"				\
+	"3:\n"							\
+	EXC(1b,3b,$31,%0)					\
+	EXC(2b,3b,$31,%0)					\
+		: "=r"(__pu_err), 				\
+	  	  "=&r"(__pu_tmp1), "=&r"(__pu_tmp2)		\
+		: "r"((unsigned long)(x)), "r"(addr), "0"(__pu_err)); \
+}
+#endif
+
+
+/*
+ * Complex access routines
+ */
+
+extern long __copy_user(void *to, const void *from, long len);
+
+static inline unsigned long
+raw_copy_from_user(void *to, const void __user *from, unsigned long len)
+{
+	return __copy_user(to, (__force const void *)from, len);
+}
+
+static inline unsigned long
+raw_copy_to_user(void __user *to, const void *from, unsigned long len)
+{
+	return __copy_user((__force void *)to, from, len);
+}
+
+extern long __clear_user(void __user *to, long len);
+
+static inline long
+clear_user(void __user *to, long len)
+{
+	if (__access_ok(to, len))
+		len = __clear_user(to, len);
+	return len;
+}
+
+extern long strncpy_from_user(char *dest, const char __user *src, long count);
+extern __must_check long strnlen_user(const char __user *str, long n);
+
+#include <asm/extable.h>
+
+#endif /* __ALPHA_UACCESS_H */