Adding upstream version 4.19.249.upstream/4.19.249upstream

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

1 files changed, 283 insertions, 0 deletions

diff --git a/arch/sparc/include/asm/uaccess_32.h b/arch/sparc/include/asm/uaccess_32.h
new file mode 100644
index 000000000..de71c65b9
--- /dev/null
+++ b/arch/sparc/include/asm/uaccess_32.h
@@ -0,0 +1,283 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * uaccess.h: User space memore access functions.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+#ifndef _ASM_UACCESS_H
+#define _ASM_UACCESS_H
+
+#include <linux/compiler.h>
+#include <linux/string.h>
+
+#include <asm/processor.h>
+
+#define ARCH_HAS_SORT_EXTABLE
+#define ARCH_HAS_SEARCH_EXTABLE
+
+/* Sparc is not segmented, however we need to be able to fool access_ok()
+ * when doing system calls from kernel mode legitimately.
+ *
+ * "For historical reasons, these macros are grossly misnamed." -Linus
+ */
+
+#define KERNEL_DS   ((mm_segment_t) { 0 })
+#define USER_DS     ((mm_segment_t) { -1 })
+
+#define get_ds()	(KERNEL_DS)
+#define get_fs()	(current->thread.current_ds)
+#define set_fs(val)	((current->thread.current_ds) = (val))
+
+#define segment_eq(a, b) ((a).seg == (b).seg)
+
+/* We have there a nice not-mapped page at PAGE_OFFSET - PAGE_SIZE, so that this test
+ * can be fairly lightweight.
+ * No one can read/write anything from userland in the kernel space by setting
+ * large size and address near to PAGE_OFFSET - a fault will break his intentions.
+ */
+#define __user_ok(addr, size) ({ (void)(size); (addr) < STACK_TOP; })
+#define __kernel_ok (uaccess_kernel())
+#define __access_ok(addr, size) (__user_ok((addr) & get_fs().seg, (size)))
+#define access_ok(type, addr, size) \
+	({ (void)(type); __access_ok((unsigned long)(addr), size); })
+
+/*
+ * 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.
+ *
+ * There is a special way how to put a range of potentially faulting
+ * insns (like twenty ldd/std's with now intervening other instructions)
+ * You specify address of first in insn and 0 in fixup and in the next
+ * exception_table_entry you specify last potentially faulting insn + 1
+ * and in fixup the routine which should handle the fault.
+ * That fixup code will get
+ * (faulting_insn_address - first_insn_in_the_range_address)/4
+ * in %g2 (ie. index of the faulting instruction in the range).
+ */
+
+struct exception_table_entry
+{
+        unsigned long insn, fixup;
+};
+
+/* Returns 0 if exception not found and fixup otherwise.  */
+unsigned long search_extables_range(unsigned long addr, unsigned long *g2);
+
+/* 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_check((__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_check((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr))); \
+})
+
+/*
+ * The "__xxx" versions do not do address space checking, useful when
+ * doing multiple accesses to the same area (the user 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)), __typeof__(*(ptr)))
+
+struct __large_struct { unsigned long buf[100]; };
+#define __m(x) ((struct __large_struct __user *)(x))
+
+#define __put_user_check(x, addr, size) ({ \
+	register int __pu_ret; \
+	if (__access_ok(addr, size)) { \
+		switch (size) { \
+		case 1: \
+			__put_user_asm(x, b, addr, __pu_ret); \
+			break; \
+		case 2: \
+			__put_user_asm(x, h, addr, __pu_ret); \
+			break; \
+		case 4: \
+			__put_user_asm(x, , addr, __pu_ret); \
+			break; \
+		case 8: \
+			__put_user_asm(x, d, addr, __pu_ret); \
+			break; \
+		default: \
+			__pu_ret = __put_user_bad(); \
+			break; \
+		} \
+	} else { \
+		__pu_ret = -EFAULT; \
+	} \
+	__pu_ret; \
+})
+
+#define __put_user_nocheck(x, addr, size) ({			\
+	register int __pu_ret;					\
+	switch (size) {						\
+	case 1: __put_user_asm(x, b, addr, __pu_ret); break;	\
+	case 2: __put_user_asm(x, h, addr, __pu_ret); break;	\
+	case 4: __put_user_asm(x, , addr, __pu_ret); break;	\
+	case 8: __put_user_asm(x, d, 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 " %1, %2\n\t"					\
+		"clr	%0\n"						\
+	"2:\n\n\t"							\
+		".section .fixup,#alloc,#execinstr\n\t"			\
+		".align	4\n"						\
+	"3:\n\t"							\
+		"b	2b\n\t"						\
+		" mov	%3, %0\n\t"					\
+		".previous\n\n\t"					\
+		".section __ex_table,#alloc\n\t"			\
+		".align	4\n\t"						\
+		".word	1b, 3b\n\t"					\
+		".previous\n\n\t"					\
+	       : "=&r" (ret) : "r" (x), "m" (*__m(addr)),		\
+		 "i" (-EFAULT))
+
+int __put_user_bad(void);
+
+#define __get_user_check(x, addr, size, type) ({ \
+	register int __gu_ret; \
+	register unsigned long __gu_val; \
+	if (__access_ok(addr, size)) { \
+		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, , addr, __gu_ret); \
+			break; \
+		case 8: \
+			__get_user_asm(__gu_val, d, addr, __gu_ret); \
+			break; \
+		default: \
+			__gu_val = 0; \
+			__gu_ret = __get_user_bad(); \
+			break; \
+		} \
+	 } else { \
+		 __gu_val = 0; \
+		 __gu_ret = -EFAULT; \
+	} \
+	x = (__force type) __gu_val; \
+	__gu_ret; \
+})
+
+#define __get_user_nocheck(x, 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, , addr, __gu_ret); break;	\
+	case 8: __get_user_asm(__gu_val, d, addr, __gu_ret); break;	\
+	default:							\
+		__gu_val = 0;						\
+		__gu_ret = __get_user_bad();				\
+		break;							\
+	}								\
+	x = (__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 " %2, %1\n\t"					\
+		"clr	%0\n"						\
+	"2:\n\n\t"							\
+		".section .fixup,#alloc,#execinstr\n\t"			\
+		".align	4\n"						\
+	"3:\n\t"							\
+		"clr	%1\n\t"						\
+		"b	2b\n\t"						\
+		" mov	%3, %0\n\n\t"					\
+		".previous\n\t"						\
+		".section __ex_table,#alloc\n\t"			\
+		".align	4\n\t"						\
+		".word	1b, 3b\n\n\t"					\
+		".previous\n\t"						\
+	       : "=&r" (ret), "=&r" (x) : "m" (*__m(addr)),		\
+		 "i" (-EFAULT))
+
+int __get_user_bad(void);
+
+unsigned long __copy_user(void __user *to, const void __user *from, unsigned long size);
+
+static inline unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+	return __copy_user(to, (__force void __user *) from, n);
+}
+
+static inline unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+	return __copy_user((__force void __user *) to, from, n);
+}
+
+#define INLINE_COPY_FROM_USER
+#define INLINE_COPY_TO_USER
+
+static inline unsigned long __clear_user(void __user *addr, unsigned long size)
+{
+	unsigned long ret;
+
+	__asm__ __volatile__ (
+		".section __ex_table,#alloc\n\t"
+		".align 4\n\t"
+		".word 1f,3\n\t"
+		".previous\n\t"
+		"mov %2, %%o1\n"
+		"1:\n\t"
+		"call __bzero\n\t"
+		" mov %1, %%o0\n\t"
+		"mov %%o0, %0\n"
+		: "=r" (ret) : "r" (addr), "r" (size) :
+		"o0", "o1", "o2", "o3", "o4", "o5", "o7",
+		"g1", "g2", "g3", "g4", "g5", "g7", "cc");
+
+	return ret;
+}
+
+static inline unsigned long clear_user(void __user *addr, unsigned long n)
+{
+	if (n && __access_ok((unsigned long) addr, n))
+		return __clear_user(addr, n);
+	else
+		return n;
+}
+
+__must_check long strnlen_user(const char __user *str, long n);
+
+#endif /* _ASM_UACCESS_H */