mirror of https://gitee.com/openkylin/linux.git
391 lines
8.8 KiB
C
391 lines
8.8 KiB
C
/*
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* User address space access functions.
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* The non inlined parts of asm-m32r/uaccess.h are here.
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*
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* Copyright 1997 Andi Kleen <ak@muc.de>
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* Copyright 1997 Linus Torvalds
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* Copyright 2001, 2002, 2004 Hirokazu Takata
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*/
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#include <linux/prefetch.h>
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#include <linux/string.h>
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#include <linux/thread_info.h>
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#include <asm/uaccess.h>
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unsigned long
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__generic_copy_to_user(void __user *to, const void *from, unsigned long n)
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{
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prefetch(from);
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if (access_ok(VERIFY_WRITE, to, n))
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__copy_user(to,from,n);
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return n;
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}
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unsigned long
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__generic_copy_from_user(void *to, const void __user *from, unsigned long n)
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{
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prefetchw(to);
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if (access_ok(VERIFY_READ, from, n))
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__copy_user_zeroing(to,from,n);
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else
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memset(to, 0, n);
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return n;
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}
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/*
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* Copy a null terminated string from userspace.
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*/
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#ifdef CONFIG_ISA_DUAL_ISSUE
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#define __do_strncpy_from_user(dst,src,count,res) \
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do { \
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int __d0, __d1, __d2; \
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__asm__ __volatile__( \
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" beqz %1, 2f\n" \
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" .fillinsn\n" \
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"0: ldb r14, @%3 || addi %3, #1\n" \
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" stb r14, @%4 || addi %4, #1\n" \
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" beqz r14, 1f\n" \
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" addi %1, #-1\n" \
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" bnez %1, 0b\n" \
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" .fillinsn\n" \
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"1: sub %0, %1\n" \
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" .fillinsn\n" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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" .balign 4\n" \
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"3: seth r14, #high(2b)\n" \
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" or3 r14, r14, #low(2b)\n" \
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" jmp r14 || ldi %0, #%5\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 0b,3b\n" \
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".previous" \
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: "=&r"(res), "=&r"(count), "=&r" (__d0), "=&r" (__d1), \
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"=&r" (__d2) \
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: "i"(-EFAULT), "0"(count), "1"(count), "3"(src), \
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"4"(dst) \
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: "r14", "cbit", "memory"); \
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} while (0)
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#else /* not CONFIG_ISA_DUAL_ISSUE */
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#define __do_strncpy_from_user(dst,src,count,res) \
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do { \
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int __d0, __d1, __d2; \
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__asm__ __volatile__( \
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" beqz %1, 2f\n" \
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" .fillinsn\n" \
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"0: ldb r14, @%3\n" \
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" stb r14, @%4\n" \
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" addi %3, #1\n" \
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" addi %4, #1\n" \
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" beqz r14, 1f\n" \
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" addi %1, #-1\n" \
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" bnez %1, 0b\n" \
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" .fillinsn\n" \
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"1: sub %0, %1\n" \
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" .fillinsn\n" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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" .balign 4\n" \
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"3: ldi %0, #%5\n" \
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" seth r14, #high(2b)\n" \
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" or3 r14, r14, #low(2b)\n" \
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" jmp r14\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 0b,3b\n" \
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".previous" \
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: "=&r"(res), "=&r"(count), "=&r" (__d0), "=&r" (__d1), \
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"=&r" (__d2) \
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: "i"(-EFAULT), "0"(count), "1"(count), "3"(src), \
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"4"(dst) \
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: "r14", "cbit", "memory"); \
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} while (0)
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#endif /* CONFIG_ISA_DUAL_ISSUE */
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long
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__strncpy_from_user(char *dst, const char __user *src, long count)
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{
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long res;
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__do_strncpy_from_user(dst, src, count, res);
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return res;
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}
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long
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strncpy_from_user(char *dst, const char __user *src, long count)
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{
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long res = -EFAULT;
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if (access_ok(VERIFY_READ, src, 1))
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__do_strncpy_from_user(dst, src, count, res);
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return res;
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}
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/*
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* Zero Userspace
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*/
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#ifdef CONFIG_ISA_DUAL_ISSUE
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#define __do_clear_user(addr,size) \
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do { \
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int __dst, __c; \
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__asm__ __volatile__( \
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" beqz %1, 9f\n" \
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" and3 r14, %0, #3\n" \
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" bnez r14, 2f\n" \
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" and3 r14, %1, #3\n" \
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" bnez r14, 2f\n" \
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" and3 %1, %1, #3\n" \
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" beqz %2, 2f\n" \
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" addi %0, #-4\n" \
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" .fillinsn\n" \
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"0: ; word clear \n" \
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" st %6, @+%0 || addi %2, #-1\n" \
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" bnez %2, 0b\n" \
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" beqz %1, 9f\n" \
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" .fillinsn\n" \
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"2: ; byte clear \n" \
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" stb %6, @%0 || addi %1, #-1\n" \
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" addi %0, #1\n" \
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" bnez %1, 2b\n" \
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" .fillinsn\n" \
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"9:\n" \
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".section .fixup,\"ax\"\n" \
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" .balign 4\n" \
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"4: slli %2, #2\n" \
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" seth r14, #high(9b)\n" \
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" or3 r14, r14, #low(9b)\n" \
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" jmp r14 || add %1, %2\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 0b,4b\n" \
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" .long 2b,9b\n" \
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".previous\n" \
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: "=&r"(__dst), "=&r"(size), "=&r"(__c) \
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: "0"(addr), "1"(size), "2"(size / 4), "r"(0) \
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: "r14", "cbit", "memory"); \
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} while (0)
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#else /* not CONFIG_ISA_DUAL_ISSUE */
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#define __do_clear_user(addr,size) \
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do { \
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int __dst, __c; \
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__asm__ __volatile__( \
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" beqz %1, 9f\n" \
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" and3 r14, %0, #3\n" \
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" bnez r14, 2f\n" \
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" and3 r14, %1, #3\n" \
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" bnez r14, 2f\n" \
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" and3 %1, %1, #3\n" \
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" beqz %2, 2f\n" \
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" addi %0, #-4\n" \
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" .fillinsn\n" \
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"0: st %6, @+%0 ; word clear \n" \
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" addi %2, #-1\n" \
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" bnez %2, 0b\n" \
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" beqz %1, 9f\n" \
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" .fillinsn\n" \
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"2: stb %6, @%0 ; byte clear \n" \
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" addi %1, #-1\n" \
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" addi %0, #1\n" \
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" bnez %1, 2b\n" \
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" .fillinsn\n" \
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"9:\n" \
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".section .fixup,\"ax\"\n" \
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" .balign 4\n" \
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"4: slli %2, #2\n" \
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" add %1, %2\n" \
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" seth r14, #high(9b)\n" \
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" or3 r14, r14, #low(9b)\n" \
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" jmp r14\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 0b,4b\n" \
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" .long 2b,9b\n" \
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".previous\n" \
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: "=&r"(__dst), "=&r"(size), "=&r"(__c) \
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: "0"(addr), "1"(size), "2"(size / 4), "r"(0) \
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: "r14", "cbit", "memory"); \
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} while (0)
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#endif /* not CONFIG_ISA_DUAL_ISSUE */
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unsigned long
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clear_user(void __user *to, unsigned long n)
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{
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if (access_ok(VERIFY_WRITE, to, n))
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__do_clear_user(to, n);
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return n;
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}
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unsigned long
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__clear_user(void __user *to, unsigned long n)
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{
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__do_clear_user(to, n);
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return n;
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}
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/*
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* Return the size of a string (including the ending 0)
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*
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* Return 0 on exception, a value greater than N if too long
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*/
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#ifdef CONFIG_ISA_DUAL_ISSUE
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long strnlen_user(const char __user *s, long n)
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{
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unsigned long mask = -__addr_ok(s);
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unsigned long res;
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__asm__ __volatile__(
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" and %0, %5 || mv r1, %1\n"
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" beqz %0, strnlen_exit\n"
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" and3 r0, %1, #3\n"
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" bnez r0, strnlen_byte_loop\n"
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" cmpui %0, #4\n"
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" bc strnlen_byte_loop\n"
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"strnlen_word_loop:\n"
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"0: ld r0, @%1+\n"
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" pcmpbz r0\n"
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" bc strnlen_last_bytes_fixup\n"
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" addi %0, #-4\n"
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" beqz %0, strnlen_exit\n"
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" bgtz %0, strnlen_word_loop\n"
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"strnlen_last_bytes:\n"
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" mv %0, %4\n"
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"strnlen_last_bytes_fixup:\n"
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" addi %1, #-4\n"
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"strnlen_byte_loop:\n"
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"1: ldb r0, @%1 || addi %0, #-1\n"
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" beqz r0, strnlen_exit\n"
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" addi %1, #1\n"
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" bnez %0, strnlen_byte_loop\n"
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"strnlen_exit:\n"
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" sub %1, r1\n"
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" add3 %0, %1, #1\n"
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" .fillinsn\n"
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"9:\n"
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".section .fixup,\"ax\"\n"
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" .balign 4\n"
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"4: addi %1, #-4\n"
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" .fillinsn\n"
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"5: seth r1, #high(9b)\n"
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" or3 r1, r1, #low(9b)\n"
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" jmp r1 || ldi %0, #0\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 0b,4b\n"
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" .long 1b,5b\n"
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".previous"
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: "=&r" (res), "=r" (s)
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: "0" (n), "1" (s), "r" (n & 3), "r" (mask), "r"(0x01010101)
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: "r0", "r1", "cbit");
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/* NOTE: strnlen_user() algorism:
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* {
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* char *p;
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* for (p = s; n-- && *p != '\0'; ++p)
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* ;
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* return p - s + 1;
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* }
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*/
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/* NOTE: If a null char. exists, return 0.
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* if ((x - 0x01010101) & ~x & 0x80808080)\n"
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* return 0;\n"
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*/
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return res & mask;
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}
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#else /* not CONFIG_ISA_DUAL_ISSUE */
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long strnlen_user(const char __user *s, long n)
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{
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unsigned long mask = -__addr_ok(s);
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unsigned long res;
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__asm__ __volatile__(
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" and %0, %5\n"
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" mv r1, %1\n"
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" beqz %0, strnlen_exit\n"
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" and3 r0, %1, #3\n"
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" bnez r0, strnlen_byte_loop\n"
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" cmpui %0, #4\n"
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" bc strnlen_byte_loop\n"
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" sll3 r3, %6, #7\n"
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"strnlen_word_loop:\n"
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"0: ld r0, @%1+\n"
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" not r2, r0\n"
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" sub r0, %6\n"
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" and r2, r3\n"
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" and r2, r0\n"
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" bnez r2, strnlen_last_bytes_fixup\n"
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" addi %0, #-4\n"
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" beqz %0, strnlen_exit\n"
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" bgtz %0, strnlen_word_loop\n"
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"strnlen_last_bytes:\n"
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" mv %0, %4\n"
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"strnlen_last_bytes_fixup:\n"
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" addi %1, #-4\n"
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"strnlen_byte_loop:\n"
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"1: ldb r0, @%1\n"
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" addi %0, #-1\n"
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" beqz r0, strnlen_exit\n"
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" addi %1, #1\n"
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" bnez %0, strnlen_byte_loop\n"
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"strnlen_exit:\n"
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" sub %1, r1\n"
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" add3 %0, %1, #1\n"
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" .fillinsn\n"
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"9:\n"
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".section .fixup,\"ax\"\n"
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" .balign 4\n"
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"4: addi %1, #-4\n"
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" .fillinsn\n"
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"5: ldi %0, #0\n"
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" seth r1, #high(9b)\n"
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" or3 r1, r1, #low(9b)\n"
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" jmp r1\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 0b,4b\n"
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" .long 1b,5b\n"
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".previous"
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: "=&r" (res), "=r" (s)
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: "0" (n), "1" (s), "r" (n & 3), "r" (mask), "r"(0x01010101)
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: "r0", "r1", "r2", "r3", "cbit");
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/* NOTE: strnlen_user() algorism:
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* {
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* char *p;
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* for (p = s; n-- && *p != '\0'; ++p)
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* ;
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* return p - s + 1;
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* }
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*/
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/* NOTE: If a null char. exists, return 0.
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* if ((x - 0x01010101) & ~x & 0x80808080)\n"
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* return 0;\n"
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*/
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return res & mask;
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}
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#endif /* CONFIG_ISA_DUAL_ISSUE */
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