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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/linux/regset.h
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..
@@ -1,11 +1,8 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  * User-mode machine state access
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  *
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  * Copyright (C) 2007 Red Hat, Inc.  All rights reserved.
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- *
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- * This copyrighted material is made available to anyone wishing to use,
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- * modify, copy, or redistribute it subject to the terms and conditions
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- * of the GNU General Public License v.2.
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  *
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  * Red Hat Author: Roland McGrath.
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  */
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@@ -20,6 +17,52 @@
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 struct task_struct;
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 struct user_regset;
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19
 
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+struct membuf {
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+	void *p;
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+	size_t left;
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+};
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+
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+static inline int membuf_zero(struct membuf *s, size_t size)
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+{
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+	if (s->left) {
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+		if (size > s->left)
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+			size = s->left;
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+		memset(s->p, 0, size);
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+		s->p += size;
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+		s->left -= size;
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+	}
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+	return s->left;
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+}
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+
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+static inline int membuf_write(struct membuf *s, const void *v, size_t size)
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+{
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+	if (s->left) {
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+		if (size > s->left)
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+			size = s->left;
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+		memcpy(s->p, v, size);
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+		s->p += size;
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+		s->left -= size;
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+	}
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+	return s->left;
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+}
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+
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+/* current s->p must be aligned for v; v must be a scalar */
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+#define membuf_store(s, v)				\
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+({							\
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+	struct membuf *__s = (s);			\
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+        if (__s->left) {				\
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+		typeof(v) __v = (v);			\
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+		size_t __size = sizeof(__v);		\
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+		if (unlikely(__size > __s->left)) {	\
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+			__size = __s->left;		\
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+			memcpy(__s->p, &__v, __size);	\
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+		} else {				\
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+			*(typeof(__v + 0) *)__s->p = __v;	\
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+		}					\
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+		__s->p += __size;			\
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+		__s->left -= __size;			\
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+	}						\
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+	__s->left;})
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66
 
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 /**
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  * user_regset_active_fn - type of @active function in &struct user_regset
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@@ -39,26 +82,9 @@
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 typedef int user_regset_active_fn(struct task_struct *target,
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 				  const struct user_regset *regset);
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-/**
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- * user_regset_get_fn - type of @get function in &struct user_regset
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- * @target:	thread being examined
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- * @regset:	regset being examined
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- * @pos:	offset into the regset data to access, in bytes
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- * @count:	amount of data to copy, in bytes
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- * @kbuf:	if not %NULL, a kernel-space pointer to copy into
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- * @ubuf:	if @kbuf is %NULL, a user-space pointer to copy into
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- *
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- * Fetch register values.  Return %0 on success; -%EIO or -%ENODEV
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- * are usual failure returns.  The @pos and @count values are in
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- * bytes, but must be properly aligned.  If @kbuf is non-null, that
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- * buffer is used and @ubuf is ignored.  If @kbuf is %NULL, then
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- * ubuf gives a userland pointer to access directly, and an -%EFAULT
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- * return value is possible.
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- */
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-typedef int user_regset_get_fn(struct task_struct *target,
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+typedef int user_regset_get2_fn(struct task_struct *target,
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 			       const struct user_regset *regset,
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-			       unsigned int pos, unsigned int count,
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-			       void *kbuf, void __user *ubuf);
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+			       struct membuf to);
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 /**
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  * user_regset_set_fn - type of @set function in &struct user_regset
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@@ -107,28 +133,6 @@
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 				     int immediate);
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 /**
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- * user_regset_get_size_fn - type of @get_size function in &struct user_regset
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- * @target:	thread being examined
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- * @regset:	regset being examined
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- *
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- * This call is optional; usually the pointer is %NULL.
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- *
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- * When provided, this function must return the current size of regset
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- * data, as observed by the @get function in &struct user_regset.  The
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- * value returned must be a multiple of @size.  The returned size is
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- * required to be valid only until the next time (if any) @regset is
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- * modified for @target.
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- *
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- * This function is intended for dynamically sized regsets.  A regset
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- * that is statically sized does not need to implement it.
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- *
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- * This function should not be called directly: instead, callers should
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- * call regset_size() to determine the current size of a regset.
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- */
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-typedef unsigned int user_regset_get_size_fn(struct task_struct *target,
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-					     const struct user_regset *regset);
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-
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-/**
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  * struct user_regset - accessible thread CPU state
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  * @n:			Number of slots (registers).
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  * @size:		Size in bytes of a slot (register).
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@@ -139,7 +143,6 @@
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  * @set:		Function to store values.
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  * @active:		Function to report if regset is active, or %NULL.
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  * @writeback:		Function to write data back to user memory, or %NULL.
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- * @get_size:		Function to return the regset's size, or %NULL.
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  *
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  * This data structure describes a machine resource we call a register set.
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  * This is part of the state of an individual thread, not necessarily
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@@ -147,12 +150,7 @@
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  * similar slots, given by @n.  Each slot is @size bytes, and aligned to
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  * @align bytes (which is at least @size).  For dynamically-sized
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  * regsets, @n must contain the maximum possible number of slots for the
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- * regset, and @get_size must point to a function that returns the
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- * current regset size.
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- *
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- * Callers that need to know only the current size of the regset and do
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- * not care about its internal structure should call regset_size()
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- * instead of inspecting @n or calling @get_size.
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+ * regset.
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  *
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  * For backward compatibility, the @get and @set methods must pad to, or
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  * accept, @n * @size bytes, even if the current regset size is smaller.
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@@ -188,11 +186,10 @@
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  * omitted when there is an @active function and it returns zero.
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  */
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 struct user_regset {
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-	user_regset_get_fn		*get;
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+	user_regset_get2_fn		*regset_get;
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 	user_regset_set_fn		*set;
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 	user_regset_active_fn		*active;
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 	user_regset_writeback_fn	*writeback;
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-	user_regset_get_size_fn		*get_size;
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 	unsigned int			n;
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 	unsigned int 			size;
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 	unsigned int 			align;
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@@ -241,44 +238,6 @@
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  */
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 const struct user_regset_view *task_user_regset_view(struct task_struct *tsk);
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-
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-/*
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- * These are helpers for writing regset get/set functions in arch code.
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- * Because @start_pos and @end_pos are always compile-time constants,
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- * these are inlined into very little code though they look large.
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- *
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- * Use one or more calls sequentially for each chunk of regset data stored
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- * contiguously in memory.  Call with constants for @start_pos and @end_pos,
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- * giving the range of byte positions in the regset that data corresponds
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- * to; @end_pos can be -1 if this chunk is at the end of the regset layout.
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- * Each call updates the arguments to point past its chunk.
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- */
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-
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-static inline int user_regset_copyout(unsigned int *pos, unsigned int *count,
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-				      void **kbuf,
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-				      void __user **ubuf, const void *data,
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-				      const int start_pos, const int end_pos)
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-{
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-	if (*count == 0)
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-		return 0;
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-	BUG_ON(*pos < start_pos);
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-	if (end_pos < 0 || *pos < end_pos) {
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-		unsigned int copy = (end_pos < 0 ? *count
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-				     : min(*count, end_pos - *pos));
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-		data += *pos - start_pos;
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-		if (*kbuf) {
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-			memcpy(*kbuf, data, copy);
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-			*kbuf += copy;
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-		} else if (__copy_to_user(*ubuf, data, copy))
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-			return -EFAULT;
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-		else
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-			*ubuf += copy;
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-		*pos += copy;
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-		*count -= copy;
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-	}
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-	return 0;
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-}
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-
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 static inline int user_regset_copyin(unsigned int *pos, unsigned int *count,
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 				     const void **kbuf,
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 				     const void __user **ubuf, void *data,
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@@ -295,35 +254,6 @@
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 			memcpy(data, *kbuf, copy);
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 			*kbuf += copy;
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 		} else if (__copy_from_user(data, *ubuf, copy))
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-			return -EFAULT;
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-		else
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-			*ubuf += copy;
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-		*pos += copy;
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-		*count -= copy;
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-	}
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-	return 0;
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-}
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-
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-/*
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- * These two parallel the two above, but for portions of a regset layout
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- * that always read as all-zero or for which writes are ignored.
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- */
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-static inline int user_regset_copyout_zero(unsigned int *pos,
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-					   unsigned int *count,
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-					   void **kbuf, void __user **ubuf,
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-					   const int start_pos,
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-					   const int end_pos)
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-{
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-	if (*count == 0)
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-		return 0;
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-	BUG_ON(*pos < start_pos);
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-	if (end_pos < 0 || *pos < end_pos) {
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-		unsigned int copy = (end_pos < 0 ? *count
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-				     : min(*count, end_pos - *pos));
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-		if (*kbuf) {
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-			memset(*kbuf, 0, copy);
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-			*kbuf += copy;
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-		} else if (__clear_user(*ubuf, copy))
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 			return -EFAULT;
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 		else
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 			*ubuf += copy;
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@@ -356,31 +286,19 @@
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 	return 0;
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 }
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-/**
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- * copy_regset_to_user - fetch a thread's user_regset data into user memory
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- * @target:	thread to be examined
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- * @view:	&struct user_regset_view describing user thread machine state
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- * @setno:	index in @view->regsets
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- * @offset:	offset into the regset data, in bytes
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- * @size:	amount of data to copy, in bytes
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- * @data:	user-mode pointer to copy into
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- */
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-static inline int copy_regset_to_user(struct task_struct *target,
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-				      const struct user_regset_view *view,
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-				      unsigned int setno,
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-				      unsigned int offset, unsigned int size,
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-				      void __user *data)
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-{
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-	const struct user_regset *regset = &view->regsets[setno];
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+extern int regset_get(struct task_struct *target,
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+		      const struct user_regset *regset,
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+		      unsigned int size, void *data);
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292
 
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-	if (!regset->get)
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-		return -EOPNOTSUPP;
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+extern int regset_get_alloc(struct task_struct *target,
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+			    const struct user_regset *regset,
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+			    unsigned int size,
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+			    void **data);
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-	if (!access_ok(VERIFY_WRITE, data, size))
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-		return -EFAULT;
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-
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-	return regset->get(target, regset, offset, size, NULL, data);
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-}
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+extern int copy_regset_to_user(struct task_struct *target,
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+			       const struct user_regset_view *view,
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+			       unsigned int setno, unsigned int offset,
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+			       unsigned int size, void __user *data);
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 /**
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  * copy_regset_from_user - store into thread's user_regset data from user memory
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@@ -402,27 +320,10 @@
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 	if (!regset->set)
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 		return -EOPNOTSUPP;
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-	if (!access_ok(VERIFY_READ, data, size))
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+	if (!access_ok(data, size))
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 		return -EFAULT;
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 	return regset->set(target, regset, offset, size, NULL, data);
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-}
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-
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-/**
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- * regset_size - determine the current size of a regset
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- * @target:	thread to be examined
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- * @regset:	regset to be examined
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- *
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- * Note that the returned size is valid only until the next time
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- * (if any) @regset is modified for @target.
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- */
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-static inline unsigned int regset_size(struct task_struct *target,
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-				       const struct user_regset *regset)
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-{
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-	if (!regset->get_size)
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-		return regset->n * regset->size;
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-	else
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-		return regset->get_size(target, regset);
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 }
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 #endif	/* <linux/regset.h> */