From 71ec6ccfdc2706e767189d40016fc802305067bb Mon Sep 17 00:00:00 2001
From: Ralf Baechle <ralf@linux-mips.org>
Date: Tue, 31 Oct 2006 02:52:56 +0000
Subject: [PATCH] MIPS: Replace use of <asm-generic/uaccess.h> with native
implementations.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
arch/mips/include/asm/uaccess.h | 264 +++++++++++++++++++++++++++++++-
1 file changed, 263 insertions(+), 1 deletion(-)
diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h
index b895144d577a..09ff5bb17445 100644
--- a/arch/mips/include/asm/uaccess.h
+++ b/arch/mips/include/asm/uaccess.h
@@ -13,7 +13,6 @@
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/thread_info.h>
-#include <asm-generic/uaccess.h>
/*
* The fs value determines whether argument validity checking should be
@@ -373,6 +372,269 @@ do { \
extern void __put_user_unknown(void);
+/*
+ * put_user_unaligned: - Write a simple value into user space.
+ * @x: Value to copy to user space.
+ * @ptr: Destination address, in user space.
+ *
+ * Context: User context only. This function may sleep.
+ *
+ * This macro copies a single simple value from kernel space to user
+ * space. It supports simple types like char and int, but not larger
+ * data types like structures or arrays.
+ *
+ * @ptr must have pointer-to-simple-variable type, and @x must be assignable
+ * to the result of dereferencing @ptr.
+ *
+ * Returns zero on success, or -EFAULT on error.
+ */
+#define put_user_unaligned(x,ptr) \
+ __put_user_unaligned_check((x),(ptr),sizeof(*(ptr)))
+
+/*
+ * get_user_unaligned: - Get a simple variable from user space.
+ * @x: Variable to store result.
+ * @ptr: Source address, in user space.
+ *
+ * Context: User context only. This function may sleep.
+ *
+ * This macro copies a single simple variable from user space to kernel
+ * space. It supports simple types like char and int, but not larger
+ * data types like structures or arrays.
+ *
+ * @ptr must have pointer-to-simple-variable type, and the result of
+ * dereferencing @ptr must be assignable to @x without a cast.
+ *
+ * Returns zero on success, or -EFAULT on error.
+ * On error, the variable @x is set to zero.
+ */
+#define get_user_unaligned(x,ptr) \
+ __get_user_unaligned_check((x),(ptr),sizeof(*(ptr)))
+
+/*
+ * __put_user_unaligned: - Write a simple value into user space, with less checking.
+ * @x: Value to copy to user space.
+ * @ptr: Destination address, in user space.
+ *
+ * Context: User context only. This function may sleep.
+ *
+ * This macro copies a single simple value from kernel space to user
+ * space. It supports simple types like char and int, but not larger
+ * data types like structures or arrays.
+ *
+ * @ptr must have pointer-to-simple-variable type, and @x must be assignable
+ * to the result of dereferencing @ptr.
+ *
+ * Caller must check the pointer with access_ok() before calling this
+ * function.
+ *
+ * Returns zero on success, or -EFAULT on error.
+ */
+#define __put_user_unaligned(x,ptr) \
+ __put_user_unaligned_nocheck((x),(ptr),sizeof(*(ptr)))
+
+/*
+ * __get_user_unaligned: - Get a simple variable from user space, with less checking.
+ * @x: Variable to store result.
+ * @ptr: Source address, in user space.
+ *
+ * Context: User context only. This function may sleep.
+ *
+ * This macro copies a single simple variable from user space to kernel
+ * space. It supports simple types like char and int, but not larger
+ * data types like structures or arrays.
+ *
+ * @ptr must have pointer-to-simple-variable type, and the result of
+ * dereferencing @ptr must be assignable to @x without a cast.
+ *
+ * Caller must check the pointer with access_ok() before calling this
+ * function.
+ *
+ * Returns zero on success, or -EFAULT on error.
+ * On error, the variable @x is set to zero.
+ */
+#define __get_user_unaligned(x,ptr) \
+ __get_user__unalignednocheck((x),(ptr),sizeof(*(ptr)))
+
+/*
+ * Yuck. We need two variants, one for 64bit operation and one
+ * for 32 bit mode and old iron.
+ */
+#ifdef CONFIG_32BIT
+#define __GET_USER_UNALIGNED_DW(val, ptr) \
+ __get_user_unaligned_asm_ll32(val, ptr)
+#endif
+#ifdef CONFIG_64BIT
+#define __GET_USER_UNALIGNED_DW(val, ptr) \
+ __get_user_unaligned_asm(val, "uld", ptr)
+#endif
+
+extern void __get_user_unaligned_unknown(void);
+
+#define __get_user_unaligned_common(val, size, ptr) \
+do { \
+ switch (size) { \
+ case 1: __get_user_asm(val, "lb", ptr); break; \
+ case 2: __get_user_unaligned_asm(val, "ulh", ptr); break; \
+ case 4: __get_user_unaligned_asm(val, "ulw", ptr); break; \
+ case 8: __GET_USER_UNALIGNED_DW(val, ptr); break; \
+ default: __get_user_unaligned_unknown(); break; \
+ } \
+} while (0)
+
+#define __get_user_unaligned_nocheck(x,ptr,size) \
+({ \
+ int __gu_err; \
+ \
+ __get_user_unaligned_common((x), size, ptr); \
+ __gu_err; \
+})
+
+#define __get_user_unaligned_check(x,ptr,size) \
+({ \
+ int __gu_err = -EFAULT; \
+ const __typeof__(*(ptr)) __user * __gu_ptr = (ptr); \
+ \
+ if (likely(access_ok(VERIFY_READ, __gu_ptr, size))) \
+ __get_user_unaligned_common((x), size, __gu_ptr); \
+ \
+ __gu_err; \
+})
+
+#define __get_user_unaligned_asm(val, insn, addr) \
+{ \
+ long __gu_tmp; \
+ \
+ __asm__ __volatile__( \
+ "1: " insn " %1, %3 \n" \
+ "2: \n" \
+ " .section .fixup,\"ax\" \n" \
+ "3: li %0, %4 \n" \
+ " j 2b \n" \
+ " .previous \n" \
+ " .section __ex_table,\"a\" \n" \
+ " "__UA_ADDR "\t1b, 3b \n" \
+ " "__UA_ADDR "\t1b + 4, 3b \n" \
+ " .previous \n" \
+ : "=r" (__gu_err), "=r" (__gu_tmp) \
+ : "0" (0), "o" (__m(addr)), "i" (-EFAULT)); \
+ \
+ (val) = (__typeof__(*(addr))) __gu_tmp; \
+}
+
+/*
+ * Get a long long 64 using 32 bit registers.
+ */
+#define __get_user_unaligned_asm_ll32(val, addr) \
+{ \
+ unsigned long long __gu_tmp; \
+ \
+ __asm__ __volatile__( \
+ "1: ulw %1, (%3) \n" \
+ "2: ulw %D1, 4(%3) \n" \
+ " move %0, $0 \n" \
+ "3: .section .fixup,\"ax\" \n" \
+ "4: li %0, %4 \n" \
+ " move %1, $0 \n" \
+ " move %D1, $0 \n" \
+ " j 3b \n" \
+ " .previous \n" \
+ " .section __ex_table,\"a\" \n" \
+ " " __UA_ADDR " 1b, 4b \n" \
+ " " __UA_ADDR " 1b + 4, 4b \n" \
+ " " __UA_ADDR " 2b, 4b \n" \
+ " " __UA_ADDR " 2b + 4, 4b \n" \
+ " .previous \n" \
+ : "=r" (__gu_err), "=&r" (__gu_tmp) \
+ : "0" (0), "r" (addr), "i" (-EFAULT)); \
+ (val) = (__typeof__(*(addr))) __gu_tmp; \
+}
+
+/*
+ * Yuck. We need two variants, one for 64bit operation and one
+ * for 32 bit mode and old iron.
+ */
+#ifdef CONFIG_32BIT
+#define __PUT_USER_UNALIGNED_DW(ptr) __put_user_unaligned_asm_ll32(ptr)
+#endif
+#ifdef CONFIG_64BIT
+#define __PUT_USER_UNALIGNED_DW(ptr) __put_user_unaligned_asm("usd", ptr)
+#endif
+
+#define __put_user_unaligned_nocheck(x,ptr,size) \
+({ \
+ __typeof__(*(ptr)) __pu_val; \
+ int __pu_err = 0; \
+ \
+ __pu_val = (x); \
+ switch (size) { \
+ case 1: __put_user_asm("sb", ptr); break; \
+ case 2: __put_user_unaligned_asm("ush", ptr); break; \
+ case 4: __put_user_unaligned_asm("usw", ptr); break; \
+ case 8: __PUT_USER_UNALIGNED_DW(ptr); break; \
+ default: __put_user_unaligned_unknown(); break; \
+ } \
+ __pu_err; \
+})
+
+#define __put_user_unaligned_check(x,ptr,size) \
+({ \
+ __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
+ __typeof__(*(ptr)) __pu_val = (x); \
+ int __pu_err = -EFAULT; \
+ \
+ if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) { \
+ switch (size) { \
+ case 1: __put_user_asm("sb", __pu_addr); break; \
+ case 2: __put_user_unaligned_asm("ush", __pu_addr); break; \
+ case 4: __put_user_unaligned_asm("usw", __pu_addr); break; \
+ case 8: __PUT_USER_UNALGINED_DW(__pu_addr); break; \
+ default: __put_user_unaligned_unknown(); break; \
+ } \
+ } \
+ __pu_err; \
+})
+
+#define __put_user_unaligned_asm(insn, ptr) \
+{ \
+ __asm__ __volatile__( \
+ "1: " insn " %z2, %3 # __put_user_unaligned_asm\n" \
+ "2: \n" \
+ " .section .fixup,\"ax\" \n" \
+ "3: li %0, %4 \n" \
+ " j 2b \n" \
+ " .previous \n" \
+ " .section __ex_table,\"a\" \n" \
+ " " __UA_ADDR " 1b, 3b \n" \
+ " .previous \n" \
+ : "=r" (__pu_err) \
+ : "0" (0), "Jr" (__pu_val), "o" (__m(ptr)), \
+ "i" (-EFAULT)); \
+}
+
+#define __put_user_unaligned_asm_ll32(ptr) \
+{ \
+ __asm__ __volatile__( \
+ "1: sw %2, (%3) # __put_user_unaligned_asm_ll32 \n" \
+ "2: sw %D2, 4(%3) \n" \
+ "3: \n" \
+ " .section .fixup,\"ax\" \n" \
+ "4: li %0, %4 \n" \
+ " j 3b \n" \
+ " .previous \n" \
+ " .section __ex_table,\"a\" \n" \
+ " " __UA_ADDR " 1b, 4b \n" \
+ " " __UA_ADDR " 1b + 4, 4b \n" \
+ " " __UA_ADDR " 2b, 4b \n" \
+ " " __UA_ADDR " 2b + 4, 4b \n" \
+ " .previous" \
+ : "=r" (__pu_err) \
+ : "0" (0), "r" (__pu_val), "r" (ptr), \
+ "i" (-EFAULT)); \
+}
+
+extern void __put_user_unaligned_unknown(void);
+
/*
* We're generating jump to subroutines which will be outside the range of
* jump instructions
--
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