Adding upstream version 4.19.249.upstream/4.19.249upstream

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

1 files changed, 204 insertions, 0 deletions

diff --git a/arch/sparc/include/asm/uaccess_64.h b/arch/sparc/include/asm/uaccess_64.h
new file mode 100644
index 000000000..cbb308cee
--- /dev/null
+++ b/arch/sparc/include/asm/uaccess_64.h
@@ -0,0 +1,204 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_UACCESS_H
+#define _ASM_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+
+#include <linux/compiler.h>
+#include <linux/string.h>
+#include <asm/asi.h>
+#include <asm/spitfire.h>
+#include <asm/extable_64.h>
+
+#include <asm/processor.h>
+
+/*
+ * Sparc64 is segmented, though more like the M68K than the I386.
+ * We use the secondary ASI to address user memory, which references a
+ * completely different VM map, thus there is zero chance of the user
+ * doing something queer and tricking us into poking kernel memory.
+ *
+ * What is left here is basically what is needed for the other parts of
+ * the kernel that expect to be able to manipulate, erum, "segments".
+ * Or perhaps more properly, permissions.
+ *
+ * "For historical reasons, these macros are grossly misnamed." -Linus
+ */
+
+#define KERNEL_DS   ((mm_segment_t) { ASI_P })
+#define USER_DS     ((mm_segment_t) { ASI_AIUS })	/* har har har */
+
+#define get_fs() ((mm_segment_t){(current_thread_info()->current_ds)})
+#define get_ds() (KERNEL_DS)
+
+#define segment_eq(a, b)  ((a).seg == (b).seg)
+
+#define set_fs(val)								\
+do {										\
+	current_thread_info()->current_ds = (val).seg;				\
+	__asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg));	\
+} while(0)
+
+/*
+ * Test whether a block of memory is a valid user space address.
+ * Returns 0 if the range is valid, nonzero otherwise.
+ */
+static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit)
+{
+	if (__builtin_constant_p(size))
+		return addr > limit - size;
+
+	addr += size;
+	if (addr < size)
+		return true;
+
+	return addr > limit;
+}
+
+#define __range_not_ok(addr, size, limit)                               \
+({                                                                      \
+	__chk_user_ptr(addr);                                           \
+	__chk_range_not_ok((unsigned long __force)(addr), size, limit); \
+})
+
+static inline int __access_ok(const void __user * addr, unsigned long size)
+{
+	return 1;
+}
+
+static inline int access_ok(int type, const void __user * addr, unsigned long size)
+{
+	return 1;
+}
+
+void __retl_efault(void);
+
+/* Uh, these should become the main single-value transfer routines..
+ * They automatically use the right size if we just have the right
+ * pointer type..
+ *
+ * This gets kind of ugly. We want to return _two_ values in "get_user()"
+ * and yet we don't want to do any pointers, because that is too much
+ * of a performance impact. Thus we have a few rather ugly macros here,
+ * and hide all the ugliness from the user.
+ */
+#define put_user(x, ptr) ({ \
+	unsigned long __pu_addr = (unsigned long)(ptr); \
+	__chk_user_ptr(ptr); \
+	__put_user_nocheck((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr)));\
+})
+
+#define get_user(x, ptr) ({ \
+	unsigned long __gu_addr = (unsigned long)(ptr); \
+	__chk_user_ptr(ptr); \
+	__get_user_nocheck((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr)));\
+})
+
+#define __put_user(x, ptr) put_user(x, ptr)
+#define __get_user(x, ptr) get_user(x, ptr)
+
+struct __large_struct { unsigned long buf[100]; };
+#define __m(x) ((struct __large_struct *)(x))
+
+#define __put_user_nocheck(data, addr, size) ({			\
+	register int __pu_ret;					\
+	switch (size) {						\
+	case 1: __put_user_asm(data, b, addr, __pu_ret); break;	\
+	case 2: __put_user_asm(data, h, addr, __pu_ret); break;	\
+	case 4: __put_user_asm(data, w, addr, __pu_ret); break;	\
+	case 8: __put_user_asm(data, x, addr, __pu_ret); break;	\
+	default: __pu_ret = __put_user_bad(); break;		\
+	}							\
+	__pu_ret;						\
+})
+
+#define __put_user_asm(x, size, addr, ret)				\
+__asm__ __volatile__(							\
+		"/* Put user asm, inline. */\n"				\
+	"1:\t"	"st"#size "a %1, [%2] %%asi\n\t"			\
+		"clr	%0\n"						\
+	"2:\n\n\t"							\
+		".section .fixup,#alloc,#execinstr\n\t"			\
+		".align	4\n"						\
+	"3:\n\t"							\
+		"sethi	%%hi(2b), %0\n\t"				\
+		"jmpl	%0 + %%lo(2b), %%g0\n\t"			\
+		" mov	%3, %0\n\n\t"					\
+		".previous\n\t"						\
+		".section __ex_table,\"a\"\n\t"				\
+		".align	4\n\t"						\
+		".word	1b, 3b\n\t"					\
+		".previous\n\n\t"					\
+	       : "=r" (ret) : "r" (x), "r" (__m(addr)),			\
+		 "i" (-EFAULT))
+
+int __put_user_bad(void);
+
+#define __get_user_nocheck(data, addr, size, type) ({			     \
+	register int __gu_ret;						     \
+	register unsigned long __gu_val;				     \
+	switch (size) {							     \
+		case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \
+		case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \
+		case 4: __get_user_asm(__gu_val, uw, addr, __gu_ret); break; \
+		case 8: __get_user_asm(__gu_val, x, addr, __gu_ret); break;  \
+		default:						     \
+			__gu_val = 0;					     \
+			__gu_ret = __get_user_bad();			     \
+			break;						     \
+	} 								     \
+	data = (__force type) __gu_val;					     \
+	 __gu_ret;							     \
+})
+
+#define __get_user_asm(x, size, addr, ret)				\
+__asm__ __volatile__(							\
+		"/* Get user asm, inline. */\n"				\
+	"1:\t"	"ld"#size "a [%2] %%asi, %1\n\t"			\
+		"clr	%0\n"						\
+	"2:\n\n\t"							\
+		".section .fixup,#alloc,#execinstr\n\t"			\
+		".align	4\n"						\
+	"3:\n\t"							\
+		"sethi	%%hi(2b), %0\n\t"				\
+		"clr	%1\n\t"						\
+		"jmpl	%0 + %%lo(2b), %%g0\n\t"			\
+		" mov	%3, %0\n\n\t"					\
+		".previous\n\t"						\
+		".section __ex_table,\"a\"\n\t"				\
+		".align	4\n\t"						\
+		".word	1b, 3b\n\n\t"					\
+		".previous\n\t"						\
+	       : "=r" (ret), "=r" (x) : "r" (__m(addr)),		\
+		 "i" (-EFAULT))
+
+int __get_user_bad(void);
+
+unsigned long __must_check raw_copy_from_user(void *to,
+					     const void __user *from,
+					     unsigned long size);
+
+unsigned long __must_check raw_copy_to_user(void __user *to,
+					   const void *from,
+					   unsigned long size);
+#define INLINE_COPY_FROM_USER
+#define INLINE_COPY_TO_USER
+
+unsigned long __must_check raw_copy_in_user(void __user *to,
+					   const void __user *from,
+					   unsigned long size);
+
+unsigned long __must_check __clear_user(void __user *, unsigned long);
+
+#define clear_user __clear_user
+
+__must_check long strnlen_user(const char __user *str, long n);
+
+struct pt_regs;
+unsigned long compute_effective_address(struct pt_regs *,
+					unsigned int insn,
+					unsigned int rd);
+
+#endif /* _ASM_UACCESS_H */