summaryrefslogtreecommitdiff
path: root/arch/sh/include/asm/uaccess_32.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sh/include/asm/uaccess_32.h')
-rw-r--r--arch/sh/include/asm/uaccess_32.h249
1 files changed, 249 insertions, 0 deletions
diff --git a/arch/sh/include/asm/uaccess_32.h b/arch/sh/include/asm/uaccess_32.h
new file mode 100644
index 000000000000..892fd6dea9db
--- /dev/null
+++ b/arch/sh/include/asm/uaccess_32.h
@@ -0,0 +1,249 @@
+/*
+ * User space memory access functions
+ *
+ * Copyright (C) 1999, 2002 Niibe Yutaka
+ * Copyright (C) 2003 - 2008 Paul Mundt
+ *
+ * Based on:
+ * MIPS implementation version 1.15 by
+ * Copyright (C) 1996, 1997, 1998 by Ralf Baechle
+ * and i386 version.
+ */
+#ifndef __ASM_SH_UACCESS_32_H
+#define __ASM_SH_UACCESS_32_H
+
+#define __get_user_size(x,ptr,size,retval) \
+do { \
+ retval = 0; \
+ switch (size) { \
+ case 1: \
+ __get_user_asm(x, ptr, retval, "b"); \
+ break; \
+ case 2: \
+ __get_user_asm(x, ptr, retval, "w"); \
+ break; \
+ case 4: \
+ __get_user_asm(x, ptr, retval, "l"); \
+ break; \
+ default: \
+ __get_user_unknown(); \
+ break; \
+ } \
+} while (0)
+
+#ifdef CONFIG_MMU
+#define __get_user_asm(x, addr, err, insn) \
+({ \
+__asm__ __volatile__( \
+ "1:\n\t" \
+ "mov." insn " %2, %1\n\t" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3:\n\t" \
+ "mov #0, %1\n\t" \
+ "mov.l 4f, %0\n\t" \
+ "jmp @%0\n\t" \
+ " mov %3, %0\n\t" \
+ ".balign 4\n" \
+ "4: .long 2b\n\t" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n\t" \
+ ".long 1b, 3b\n\t" \
+ ".previous" \
+ :"=&r" (err), "=&r" (x) \
+ :"m" (__m(addr)), "i" (-EFAULT), "0" (err)); })
+#else
+#define __get_user_asm(x, addr, err, insn) \
+do { \
+ __asm__ __volatile__ ( \
+ "mov." insn " %1, %0\n\t" \
+ : "=&r" (x) \
+ : "m" (__m(addr)) \
+ ); \
+} while (0)
+#endif /* CONFIG_MMU */
+
+extern void __get_user_unknown(void);
+
+#define __put_user_size(x,ptr,size,retval) \
+do { \
+ retval = 0; \
+ switch (size) { \
+ case 1: \
+ __put_user_asm(x, ptr, retval, "b"); \
+ break; \
+ case 2: \
+ __put_user_asm(x, ptr, retval, "w"); \
+ break; \
+ case 4: \
+ __put_user_asm((u32)x, ptr, \
+ retval, "l"); \
+ break; \
+ case 8: \
+ __put_user_u64(x, ptr, retval); \
+ break; \
+ default: \
+ __put_user_unknown(); \
+ } \
+} while (0)
+
+#ifdef CONFIG_MMU
+#define __put_user_asm(x, addr, err, insn) \
+do { \
+ __asm__ __volatile__ ( \
+ "1:\n\t" \
+ "mov." insn " %1, %2\n\t" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3:\n\t" \
+ "mov.l 4f, %0\n\t" \
+ "jmp @%0\n\t" \
+ " mov %3, %0\n\t" \
+ ".balign 4\n" \
+ "4: .long 2b\n\t" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n\t" \
+ ".long 1b, 3b\n\t" \
+ ".previous" \
+ : "=&r" (err) \
+ : "r" (x), "m" (__m(addr)), "i" (-EFAULT), \
+ "0" (err) \
+ : "memory" \
+ ); \
+} while (0)
+#else
+#define __put_user_asm(x, addr, err, insn) \
+do { \
+ __asm__ __volatile__ ( \
+ "mov." insn " %0, %1\n\t" \
+ : /* no outputs */ \
+ : "r" (x), "m" (__m(addr)) \
+ : "memory" \
+ ); \
+} while (0)
+#endif /* CONFIG_MMU */
+
+#if defined(CONFIG_CPU_LITTLE_ENDIAN)
+#define __put_user_u64(val,addr,retval) \
+({ \
+__asm__ __volatile__( \
+ "1:\n\t" \
+ "mov.l %R1,%2\n\t" \
+ "mov.l %S1,%T2\n\t" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3:\n\t" \
+ "mov.l 4f,%0\n\t" \
+ "jmp @%0\n\t" \
+ " mov %3,%0\n\t" \
+ ".balign 4\n" \
+ "4: .long 2b\n\t" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n\t" \
+ ".long 1b, 3b\n\t" \
+ ".previous" \
+ : "=r" (retval) \
+ : "r" (val), "m" (__m(addr)), "i" (-EFAULT), "0" (retval) \
+ : "memory"); })
+#else
+#define __put_user_u64(val,addr,retval) \
+({ \
+__asm__ __volatile__( \
+ "1:\n\t" \
+ "mov.l %S1,%2\n\t" \
+ "mov.l %R1,%T2\n\t" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3:\n\t" \
+ "mov.l 4f,%0\n\t" \
+ "jmp @%0\n\t" \
+ " mov %3,%0\n\t" \
+ ".balign 4\n" \
+ "4: .long 2b\n\t" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n\t" \
+ ".long 1b, 3b\n\t" \
+ ".previous" \
+ : "=r" (retval) \
+ : "r" (val), "m" (__m(addr)), "i" (-EFAULT), "0" (retval) \
+ : "memory"); })
+#endif
+
+extern void __put_user_unknown(void);
+
+static inline int
+__strncpy_from_user(unsigned long __dest, unsigned long __user __src, int __count)
+{
+ __kernel_size_t res;
+ unsigned long __dummy, _d, _s, _c;
+
+ __asm__ __volatile__(
+ "9:\n"
+ "mov.b @%2+, %1\n\t"
+ "cmp/eq #0, %1\n\t"
+ "bt/s 2f\n"
+ "1:\n"
+ "mov.b %1, @%3\n\t"
+ "dt %4\n\t"
+ "bf/s 9b\n\t"
+ " add #1, %3\n\t"
+ "2:\n\t"
+ "sub %4, %0\n"
+ "3:\n"
+ ".section .fixup,\"ax\"\n"
+ "4:\n\t"
+ "mov.l 5f, %1\n\t"
+ "jmp @%1\n\t"
+ " mov %9, %0\n\t"
+ ".balign 4\n"
+ "5: .long 3b\n"
+ ".previous\n"
+ ".section __ex_table,\"a\"\n"
+ " .balign 4\n"
+ " .long 9b,4b\n"
+ ".previous"
+ : "=r" (res), "=&z" (__dummy), "=r" (_s), "=r" (_d), "=r"(_c)
+ : "0" (__count), "2" (__src), "3" (__dest), "4" (__count),
+ "i" (-EFAULT)
+ : "memory", "t");
+
+ return res;
+}
+
+/*
+ * Return the size of a string (including the ending 0 even when we have
+ * exceeded the maximum string length).
+ */
+static inline long __strnlen_user(const char __user *__s, long __n)
+{
+ unsigned long res;
+ unsigned long __dummy;
+
+ __asm__ __volatile__(
+ "1:\t"
+ "mov.b @(%0,%3), %1\n\t"
+ "cmp/eq %4, %0\n\t"
+ "bt/s 2f\n\t"
+ " add #1, %0\n\t"
+ "tst %1, %1\n\t"
+ "bf 1b\n\t"
+ "2:\n"
+ ".section .fixup,\"ax\"\n"
+ "3:\n\t"
+ "mov.l 4f, %1\n\t"
+ "jmp @%1\n\t"
+ " mov #0, %0\n"
+ ".balign 4\n"
+ "4: .long 2b\n"
+ ".previous\n"
+ ".section __ex_table,\"a\"\n"
+ " .balign 4\n"
+ " .long 1b,3b\n"
+ ".previous"
+ : "=z" (res), "=&r" (__dummy)
+ : "0" (0), "r" (__s), "r" (__n)
+ : "t");
+ return res;
+}
+
+#endif /* __ASM_SH_UACCESS_32_H */
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-03 02:35:45 +0300