Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 295 insertions, 0 deletions

diff --git a/arch/ia64/include/asm/uaccess.h b/arch/ia64/include/asm/uaccess.h
new file mode 100644
index 000000000..a74524f2d
--- /dev/null
+++ b/arch/ia64/include/asm/uaccess.h
@@ -0,0 +1,295 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_IA64_UACCESS_H
+#define _ASM_IA64_UACCESS_H
+
+/*
+ * This file defines various macros to transfer memory areas across
+ * the user/kernel boundary.  This needs to be done carefully because
+ * this code is executed in kernel mode and uses user-specified
+ * addresses.  Thus, we need to be careful not to let the user to
+ * trick us into accessing kernel memory that would normally be
+ * inaccessible.  This code is also fairly performance sensitive,
+ * so we want to spend as little time doing safety checks as
+ * possible.
+ *
+ * To make matters a bit more interesting, these macros sometimes also
+ * called from within the kernel itself, in which case the address
+ * validity check must be skipped.  The get_fs() macro tells us what
+ * to do: if get_fs()==USER_DS, checking is performed, if
+ * get_fs()==KERNEL_DS, checking is bypassed.
+ *
+ * Note that even if the memory area specified by the user is in a
+ * valid address range, it is still possible that we'll get a page
+ * fault while accessing it.  This is handled by filling out an
+ * exception handler fixup entry for each instruction that has the
+ * potential to fault.  When such a fault occurs, the page fault
+ * handler checks to see whether the faulting instruction has a fixup
+ * associated and, if so, sets r8 to -EFAULT and clears r9 to 0 and
+ * then resumes execution at the continuation point.
+ *
+ * Based on <asm-alpha/uaccess.h>.
+ *
+ * Copyright (C) 1998, 1999, 2001-2004 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+
+#include <linux/compiler.h>
+#include <linux/page-flags.h>
+#include <linux/mm.h>
+
+#include <asm/intrinsics.h>
+#include <asm/pgtable.h>
+#include <asm/io.h>
+#include <asm/extable.h>
+
+/*
+ * For historical reasons, the following macros are grossly misnamed:
+ */
+#define KERNEL_DS	((mm_segment_t) { ~0UL })		/* cf. access_ok() */
+#define USER_DS		((mm_segment_t) { TASK_SIZE-1 })	/* cf. access_ok() */
+
+#define get_ds()  (KERNEL_DS)
+#define get_fs()  (current_thread_info()->addr_limit)
+#define set_fs(x) (current_thread_info()->addr_limit = (x))
+
+#define segment_eq(a, b)	((a).seg == (b).seg)
+
+/*
+ * When accessing user memory, we need to make sure the entire area really is in
+ * user-level space.  In order to do this efficiently, we make sure that the page at
+ * address TASK_SIZE is never valid.  We also need to make sure that the address doesn't
+ * point inside the virtually mapped linear page table.
+ */
+static inline int __access_ok(const void __user *p, unsigned long size)
+{
+	unsigned long addr = (unsigned long)p;
+	unsigned long seg = get_fs().seg;
+	return likely(addr <= seg) &&
+	 (seg == KERNEL_DS.seg || likely(REGION_OFFSET(addr) < RGN_MAP_LIMIT));
+}
+#define access_ok(type, addr, size)	__access_ok((addr), (size))
+
+/*
+ * These are the main single-value transfer routines.  They automatically
+ * use the right size if we just have the right pointer type.
+ *
+ * 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)))
+
+#ifdef ASM_SUPPORTED
+  struct __large_struct { unsigned long buf[100]; };
+# define __m(x) (*(struct __large_struct __user *)(x))
+
+/* We need to declare the __ex_table section before we can use it in .xdata.  */
+asm (".section \"__ex_table\", \"a\"\n\t.previous");
+
+# define __get_user_size(val, addr, n, err)							\
+do {												\
+	register long __gu_r8 asm ("r8") = 0;							\
+	register long __gu_r9 asm ("r9");							\
+	asm ("\n[1:]\tld"#n" %0=%2%P2\t// %0 and %1 get overwritten by exception handler\n"	\
+	     "\t.xdata4 \"__ex_table\", 1b-., 1f-.+4\n"						\
+	     "[1:]"										\
+	     : "=r"(__gu_r9), "=r"(__gu_r8) : "m"(__m(addr)), "1"(__gu_r8));			\
+	(err) = __gu_r8;									\
+	(val) = __gu_r9;									\
+} while (0)
+
+/*
+ * The "__put_user_size()" macro tells gcc it reads from memory instead of writing it.  This
+ * is because they do not write to any memory gcc knows about, so there are no aliasing
+ * issues.
+ */
+# define __put_user_size(val, addr, n, err)							\
+do {												\
+	register long __pu_r8 asm ("r8") = 0;							\
+	asm volatile ("\n[1:]\tst"#n" %1=%r2%P1\t// %0 gets overwritten by exception handler\n"	\
+		      "\t.xdata4 \"__ex_table\", 1b-., 1f-.\n"					\
+		      "[1:]"									\
+		      : "=r"(__pu_r8) : "m"(__m(addr)), "rO"(val), "0"(__pu_r8));		\
+	(err) = __pu_r8;									\
+} while (0)
+
+#else /* !ASM_SUPPORTED */
+# define RELOC_TYPE	2	/* ip-rel */
+# define __get_user_size(val, addr, n, err)				\
+do {									\
+	__ld_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE);	\
+	(err) = ia64_getreg(_IA64_REG_R8);				\
+	(val) = ia64_getreg(_IA64_REG_R9);				\
+} while (0)
+# define __put_user_size(val, addr, n, err)				\
+do {									\
+	__st_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE,	\
+		  (__force unsigned long) (val));			\
+	(err) = ia64_getreg(_IA64_REG_R8);				\
+} while (0)
+#endif /* !ASM_SUPPORTED */
+
+extern void __get_user_unknown (void);
+
+/*
+ * Evaluating arguments X, PTR, SIZE, and SEGMENT may involve subroutine-calls, which
+ * could clobber r8 and r9 (among others).  Thus, be careful not to evaluate it while
+ * using r8/r9.
+ */
+#define __do_get_user(check, x, ptr, size)						\
+({											\
+	const __typeof__(*(ptr)) __user *__gu_ptr = (ptr);				\
+	__typeof__ (size) __gu_size = (size);						\
+	long __gu_err = -EFAULT;							\
+	unsigned long __gu_val = 0;							\
+	if (!check || __access_ok(__gu_ptr, size))					\
+		switch (__gu_size) {							\
+		      case 1: __get_user_size(__gu_val, __gu_ptr, 1, __gu_err); break;	\
+		      case 2: __get_user_size(__gu_val, __gu_ptr, 2, __gu_err); break;	\
+		      case 4: __get_user_size(__gu_val, __gu_ptr, 4, __gu_err); break;	\
+		      case 8: __get_user_size(__gu_val, __gu_ptr, 8, __gu_err); break;	\
+		      default: __get_user_unknown(); break;				\
+		}									\
+	(x) = (__force __typeof__(*(__gu_ptr))) __gu_val;				\
+	__gu_err;									\
+})
+
+#define __get_user_nocheck(x, ptr, size)	__do_get_user(0, x, ptr, size)
+#define __get_user_check(x, ptr, size)	__do_get_user(1, x, ptr, size)
+
+extern void __put_user_unknown (void);
+
+/*
+ * Evaluating arguments X, PTR, SIZE, and SEGMENT may involve subroutine-calls, which
+ * could clobber r8 (among others).  Thus, be careful not to evaluate them while using r8.
+ */
+#define __do_put_user(check, x, ptr, size)						\
+({											\
+	__typeof__ (x) __pu_x = (x);							\
+	__typeof__ (*(ptr)) __user *__pu_ptr = (ptr);					\
+	__typeof__ (size) __pu_size = (size);						\
+	long __pu_err = -EFAULT;							\
+											\
+	if (!check || __access_ok(__pu_ptr, __pu_size))					\
+		switch (__pu_size) {							\
+		      case 1: __put_user_size(__pu_x, __pu_ptr, 1, __pu_err); break;	\
+		      case 2: __put_user_size(__pu_x, __pu_ptr, 2, __pu_err); break;	\
+		      case 4: __put_user_size(__pu_x, __pu_ptr, 4, __pu_err); break;	\
+		      case 8: __put_user_size(__pu_x, __pu_ptr, 8, __pu_err); break;	\
+		      default: __put_user_unknown(); break;				\
+		}									\
+	__pu_err;									\
+})
+
+#define __put_user_nocheck(x, ptr, size)	__do_put_user(0, x, ptr, size)
+#define __put_user_check(x, ptr, size)	__do_put_user(1, x, ptr, size)
+
+/*
+ * Complex access routines
+ */
+extern unsigned long __must_check __copy_user (void __user *to, const void __user *from,
+					       unsigned long count);
+
+static inline unsigned long
+raw_copy_to_user(void __user *to, const void *from, unsigned long count)
+{
+	return __copy_user(to, (__force void __user *) from, count);
+}
+
+static inline unsigned long
+raw_copy_from_user(void *to, const void __user *from, unsigned long count)
+{
+	return __copy_user((__force void __user *) to, from, count);
+}
+
+#define INLINE_COPY_FROM_USER
+#define INLINE_COPY_TO_USER
+
+extern unsigned long __do_clear_user (void __user *, unsigned long);
+
+#define __clear_user(to, n)		__do_clear_user(to, n)
+
+#define clear_user(to, n)					\
+({								\
+	unsigned long __cu_len = (n);				\
+	if (__access_ok(to, __cu_len))				\
+		__cu_len = __do_clear_user(to, __cu_len);	\
+	__cu_len;						\
+})
+
+
+/*
+ * Returns: -EFAULT if exception before terminator, N if the entire buffer filled, else
+ * strlen.
+ */
+extern long __must_check __strncpy_from_user (char *to, const char __user *from, long to_len);
+
+#define strncpy_from_user(to, from, n)					\
+({									\
+	const char __user * __sfu_from = (from);			\
+	long __sfu_ret = -EFAULT;					\
+	if (__access_ok(__sfu_from, 0))					\
+		__sfu_ret = __strncpy_from_user((to), __sfu_from, (n));	\
+	__sfu_ret;							\
+})
+
+/*
+ * Returns: 0 if exception before NUL or reaching the supplied limit
+ * (N), a value greater than N if the limit would be exceeded, else
+ * strlen.
+ */
+extern unsigned long __strnlen_user (const char __user *, long);
+
+#define strnlen_user(str, len)					\
+({								\
+	const char __user *__su_str = (str);			\
+	unsigned long __su_ret = 0;				\
+	if (__access_ok(__su_str, 0))				\
+		__su_ret = __strnlen_user(__su_str, len);	\
+	__su_ret;						\
+})
+
+#define ARCH_HAS_TRANSLATE_MEM_PTR	1
+static __inline__ void *
+xlate_dev_mem_ptr(phys_addr_t p)
+{
+	struct page *page;
+	void *ptr;
+
+	page = pfn_to_page(p >> PAGE_SHIFT);
+	if (PageUncached(page))
+		ptr = (void *)p + __IA64_UNCACHED_OFFSET;
+	else
+		ptr = __va(p);
+
+	return ptr;
+}
+
+/*
+ * Convert a virtual cached kernel memory pointer to an uncached pointer
+ */
+static __inline__ void *
+xlate_dev_kmem_ptr(void *p)
+{
+	struct page *page;
+	void *ptr;
+
+	page = virt_to_page((unsigned long)p);
+	if (PageUncached(page))
+		ptr = (void *)__pa(p) + __IA64_UNCACHED_OFFSET;
+	else
+		ptr = p;
+
+	return ptr;
+}
+
+#endif /* _ASM_IA64_UACCESS_H */