278 lines
5.8 KiB
C
278 lines
5.8 KiB
C
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/*
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* User space memory access functions
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*
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* Copyright (C) 1999, 2002 Niibe Yutaka
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* Copyright (C) 2003 - 2008 Paul Mundt
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*
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* Based on:
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* MIPS implementation version 1.15 by
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* Copyright (C) 1996, 1997, 1998 by Ralf Baechle
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* and i386 version.
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*/
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#ifndef __ASM_SH_UACCESS_32_H
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#define __ASM_SH_UACCESS_32_H
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#if !defined(CONFIG_MMU)
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#define __access_ok(addr, size) \
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(__addr_ok((addr) + (size)))
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#else /* CONFIG_MMU */
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/*
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* __access_ok: Check if address with size is OK or not.
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*
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* Uhhuh, this needs 33-bit arithmetic. We have a carry..
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*
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* sum := addr + size; carry? --> flag = true;
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* if (sum >= addr_limit) flag = true;
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*/
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static inline int __access_ok(unsigned long addr, unsigned long size)
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{
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unsigned long flag, sum;
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__asm__("clrt\n\t"
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"addc %3, %1\n\t"
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"movt %0\n\t"
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"cmp/hi %4, %1\n\t"
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"rotcl %0"
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:"=&r" (flag), "=r" (sum)
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:"1" (addr), "r" (size),
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"r" (current_thread_info()->addr_limit.seg)
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:"t");
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return flag == 0;
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}
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#endif /* CONFIG_MMU */
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#define __get_user_size(x,ptr,size,retval) \
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do { \
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retval = 0; \
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switch (size) { \
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case 1: \
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__get_user_asm(x, ptr, retval, "b"); \
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break; \
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case 2: \
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__get_user_asm(x, ptr, retval, "w"); \
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break; \
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case 4: \
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__get_user_asm(x, ptr, retval, "l"); \
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break; \
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default: \
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__get_user_unknown(); \
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break; \
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} \
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} while (0)
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#ifdef CONFIG_MMU
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#define __get_user_asm(x, addr, err, insn) \
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({ \
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__asm__ __volatile__( \
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"1:\n\t" \
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"mov." insn " %2, %1\n\t" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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"3:\n\t" \
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"mov #0, %1\n\t" \
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"mov.l 4f, %0\n\t" \
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"jmp @%0\n\t" \
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" mov %3, %0\n\t" \
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".balign 4\n" \
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"4: .long 2b\n\t" \
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".previous\n" \
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".section __ex_table,\"a\"\n\t" \
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".long 1b, 3b\n\t" \
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".previous" \
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:"=&r" (err), "=&r" (x) \
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:"m" (__m(addr)), "i" (-EFAULT), "0" (err)); })
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#else
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#define __get_user_asm(x, addr, err, insn) \
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do { \
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__asm__ __volatile__ ( \
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"mov." insn " %1, %0\n\t" \
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: "=&r" (x) \
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: "m" (__m(addr)) \
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); \
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} while (0)
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#endif /* CONFIG_MMU */
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extern void __get_user_unknown(void);
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#define __put_user_size(x,ptr,size,retval) \
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do { \
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retval = 0; \
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switch (size) { \
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case 1: \
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__put_user_asm(x, ptr, retval, "b"); \
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break; \
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case 2: \
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__put_user_asm(x, ptr, retval, "w"); \
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break; \
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case 4: \
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__put_user_asm(x, ptr, retval, "l"); \
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break; \
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case 8: \
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__put_user_u64(x, ptr, retval); \
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break; \
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default: \
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__put_user_unknown(); \
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} \
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} while (0)
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#ifdef CONFIG_MMU
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#define __put_user_asm(x, addr, err, insn) \
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do { \
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__asm__ __volatile__ ( \
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"1:\n\t" \
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"mov." insn " %1, %2\n\t" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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"3:\n\t" \
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"mov.l 4f, %0\n\t" \
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"jmp @%0\n\t" \
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" mov %3, %0\n\t" \
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".balign 4\n" \
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"4: .long 2b\n\t" \
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".previous\n" \
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".section __ex_table,\"a\"\n\t" \
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".long 1b, 3b\n\t" \
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".previous" \
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: "=&r" (err) \
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: "r" (x), "m" (__m(addr)), "i" (-EFAULT), \
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"0" (err) \
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: "memory" \
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); \
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} while (0)
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#else
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#define __put_user_asm(x, addr, err, insn) \
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do { \
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__asm__ __volatile__ ( \
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"mov." insn " %0, %1\n\t" \
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: /* no outputs */ \
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: "r" (x), "m" (__m(addr)) \
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: "memory" \
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); \
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} while (0)
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#endif /* CONFIG_MMU */
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#if defined(CONFIG_CPU_LITTLE_ENDIAN)
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#define __put_user_u64(val,addr,retval) \
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({ \
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__asm__ __volatile__( \
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"1:\n\t" \
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"mov.l %R1,%2\n\t" \
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"mov.l %S1,%T2\n\t" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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"3:\n\t" \
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"mov.l 4f,%0\n\t" \
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"jmp @%0\n\t" \
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" mov %3,%0\n\t" \
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".balign 4\n" \
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"4: .long 2b\n\t" \
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".previous\n" \
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".section __ex_table,\"a\"\n\t" \
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".long 1b, 3b\n\t" \
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".previous" \
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: "=r" (retval) \
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: "r" (val), "m" (__m(addr)), "i" (-EFAULT), "0" (retval) \
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: "memory"); })
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#else
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#define __put_user_u64(val,addr,retval) \
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({ \
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__asm__ __volatile__( \
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"1:\n\t" \
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"mov.l %S1,%2\n\t" \
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"mov.l %R1,%T2\n\t" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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"3:\n\t" \
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"mov.l 4f,%0\n\t" \
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"jmp @%0\n\t" \
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" mov %3,%0\n\t" \
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".balign 4\n" \
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"4: .long 2b\n\t" \
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".previous\n" \
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".section __ex_table,\"a\"\n\t" \
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".long 1b, 3b\n\t" \
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".previous" \
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: "=r" (retval) \
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: "r" (val), "m" (__m(addr)), "i" (-EFAULT), "0" (retval) \
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: "memory"); })
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#endif
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extern void __put_user_unknown(void);
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static inline int
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__strncpy_from_user(unsigned long __dest, unsigned long __user __src, int __count)
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{
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__kernel_size_t res;
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unsigned long __dummy, _d, _s, _c;
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__asm__ __volatile__(
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"9:\n"
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"mov.b @%2+, %1\n\t"
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"cmp/eq #0, %1\n\t"
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"bt/s 2f\n"
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"1:\n"
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"mov.b %1, @%3\n\t"
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"dt %4\n\t"
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"bf/s 9b\n\t"
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" add #1, %3\n\t"
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"2:\n\t"
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"sub %4, %0\n"
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"3:\n"
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".section .fixup,\"ax\"\n"
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"4:\n\t"
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"mov.l 5f, %1\n\t"
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"jmp @%1\n\t"
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" mov %9, %0\n\t"
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".balign 4\n"
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"5: .long 3b\n"
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".previous\n"
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".section __ex_table,\"a\"\n"
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" .balign 4\n"
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" .long 9b,4b\n"
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".previous"
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: "=r" (res), "=&z" (__dummy), "=r" (_s), "=r" (_d), "=r"(_c)
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: "0" (__count), "2" (__src), "3" (__dest), "4" (__count),
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"i" (-EFAULT)
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: "memory", "t");
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return res;
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}
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/*
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* Return the size of a string (including the ending 0 even when we have
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* exceeded the maximum string length).
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*/
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static inline long __strnlen_user(const char __user *__s, long __n)
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{
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unsigned long res;
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unsigned long __dummy;
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__asm__ __volatile__(
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"1:\t"
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"mov.b @(%0,%3), %1\n\t"
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"cmp/eq %4, %0\n\t"
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"bt/s 2f\n\t"
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" add #1, %0\n\t"
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"tst %1, %1\n\t"
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"bf 1b\n\t"
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"2:\n"
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".section .fixup,\"ax\"\n"
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"3:\n\t"
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"mov.l 4f, %1\n\t"
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"jmp @%1\n\t"
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" mov #0, %0\n"
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".balign 4\n"
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"4: .long 2b\n"
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".previous\n"
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".section __ex_table,\"a\"\n"
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" .balign 4\n"
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" .long 1b,3b\n"
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".previous"
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: "=z" (res), "=&r" (__dummy)
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: "0" (0), "r" (__s), "r" (__n)
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: "t");
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return res;
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}
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#endif /* __ASM_SH_UACCESS_32_H */
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