Adding upstream version 4.19.249.upstream/4.19.249upstream

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

1 files changed, 158 insertions, 0 deletions

diff --git a/arch/m68k/include/asm/uaccess_no.h b/arch/m68k/include/asm/uaccess_no.h
new file mode 100644
index 000000000..892efb56b
--- /dev/null
+++ b/arch/m68k/include/asm/uaccess_no.h
@@ -0,0 +1,158 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __M68KNOMMU_UACCESS_H
+#define __M68KNOMMU_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+#include <linux/mm.h>
+#include <linux/string.h>
+
+#include <asm/segment.h>
+
+#define access_ok(type,addr,size)	_access_ok((unsigned long)(addr),(size))
+
+/*
+ * It is not enough to just have access_ok check for a real RAM address.
+ * This would disallow the case of code/ro-data running XIP in flash/rom.
+ * Ideally we would check the possible flash ranges too, but that is
+ * currently not so easy.
+ */
+static inline int _access_ok(unsigned long addr, unsigned long size)
+{
+	return 1;
+}
+
+/*
+ * 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, ptr)				\
+({							\
+    int __pu_err = 0;					\
+    typeof(*(ptr)) __pu_val = (x);			\
+    switch (sizeof (*(ptr))) {				\
+    case 1:						\
+	__put_user_asm(__pu_err, __pu_val, ptr, b);	\
+	break;						\
+    case 2:						\
+	__put_user_asm(__pu_err, __pu_val, ptr, w);	\
+	break;						\
+    case 4:						\
+	__put_user_asm(__pu_err, __pu_val, ptr, l);	\
+	break;						\
+    case 8:						\
+	memcpy(ptr, &__pu_val, sizeof (*(ptr))); \
+	break;						\
+    default:						\
+	__pu_err = __put_user_bad();			\
+	break;						\
+    }							\
+    __pu_err;						\
+})
+#define __put_user(x, ptr) put_user(x, ptr)
+
+extern int __put_user_bad(void);
+
+/*
+ * 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(err,x,ptr,bwl)				\
+	__asm__ ("move" #bwl " %0,%1"				\
+		: /* no outputs */						\
+		:"d" (x),"m" (*__ptr(ptr)) : "memory")
+
+#define get_user(x, ptr)					\
+({								\
+    int __gu_err = 0;						\
+    typeof(x) __gu_val = 0;					\
+    switch (sizeof(*(ptr))) {					\
+    case 1:							\
+	__get_user_asm(__gu_err, __gu_val, ptr, b, "=d");	\
+	break;							\
+    case 2:							\
+	__get_user_asm(__gu_err, __gu_val, ptr, w, "=r");	\
+	break;							\
+    case 4:							\
+	__get_user_asm(__gu_err, __gu_val, ptr, l, "=r");	\
+	break;							\
+    case 8:							\
+	memcpy((void *) &__gu_val, ptr, sizeof (*(ptr)));	\
+	break;							\
+    default:							\
+	__gu_val = 0;						\
+	__gu_err = __get_user_bad();				\
+	break;							\
+    }								\
+    (x) = (typeof(*(ptr))) __gu_val;				\
+    __gu_err;							\
+})
+#define __get_user(x, ptr) get_user(x, ptr)
+
+extern int __get_user_bad(void);
+
+#define __get_user_asm(err,x,ptr,bwl,reg)			\
+	__asm__ ("move" #bwl " %1,%0"				\
+		 : "=d" (x)					\
+		 : "m" (*__ptr(ptr)))
+
+static inline unsigned long
+raw_copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+	memcpy(to, (__force const void *)from, n);
+	return 0;
+}
+
+static inline unsigned long
+raw_copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+	memcpy((__force void *)to, from, n);
+	return 0;
+}
+#define INLINE_COPY_FROM_USER
+#define INLINE_COPY_TO_USER
+
+/*
+ * Copy a null terminated string from userspace.
+ */
+
+static inline long
+strncpy_from_user(char *dst, const char *src, long count)
+{
+	char *tmp;
+	strncpy(dst, src, count);
+	for (tmp = dst; *tmp && count > 0; tmp++, count--)
+		;
+	return(tmp - dst); /* DAVIDM should we count a NUL ?  check getname */
+}
+
+/*
+ * 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); /* DAVIDM make safer */
+}
+
+/*
+ * 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 /* _M68KNOMMU_UACCESS_H */