diff options
Diffstat (limited to 'arch/sh/include/asm/uaccess_32.h')
-rw-r--r-- | arch/sh/include/asm/uaccess_32.h | 249 |
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 00000000000..892fd6dea9d --- /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 */ |