MIPS: Replace use of <asm-generic/uaccess.h> with native implementations.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 263 insertions, 1 deletions

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
@@ -374,6 +373,269 @@ 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
  */