661 lines
18 KiB
C
661 lines
18 KiB
C
/*
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* Authors: Bjorn Wesen (bjornw@axis.com)
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* Hans-Peter Nilsson (hp@axis.com)
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*
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*/
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#ifndef _CRIS_ARCH_UACCESS_H
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#define _CRIS_ARCH_UACCESS_H
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/*
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* We don't tell gcc that we are accessing memory, but this is OK
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* because we do not write to any memory gcc knows about, so there
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* are no aliasing issues.
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*
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* Note that PC at a fault is the address *after* the faulting
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* instruction.
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*/
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#define __put_user_asm(x, addr, err, op) \
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__asm__ __volatile__( \
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" "op" %1,[%2]\n" \
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"2:\n" \
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" .section .fixup,\"ax\"\n" \
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"3: move.d %3,%0\n" \
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" jump 2b\n" \
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" .previous\n" \
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" .section __ex_table,\"a\"\n" \
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" .dword 2b,3b\n" \
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" .previous\n" \
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: "=r" (err) \
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: "r" (x), "r" (addr), "g" (-EFAULT), "0" (err))
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#define __put_user_asm_64(x, addr, err) \
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__asm__ __volatile__( \
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" move.d %M1,[%2]\n" \
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"2: move.d %H1,[%2+4]\n" \
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"4:\n" \
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" .section .fixup,\"ax\"\n" \
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"3: move.d %3,%0\n" \
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" jump 4b\n" \
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" .previous\n" \
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" .section __ex_table,\"a\"\n" \
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" .dword 2b,3b\n" \
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" .dword 4b,3b\n" \
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" .previous\n" \
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: "=r" (err) \
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: "r" (x), "r" (addr), "g" (-EFAULT), "0" (err))
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/* See comment before __put_user_asm. */
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#define __get_user_asm(x, addr, err, op) \
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__asm__ __volatile__( \
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" "op" [%2],%1\n" \
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"2:\n" \
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" .section .fixup,\"ax\"\n" \
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"3: move.d %3,%0\n" \
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" moveq 0,%1\n" \
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" jump 2b\n" \
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" .previous\n" \
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" .section __ex_table,\"a\"\n" \
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" .dword 2b,3b\n" \
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" .previous\n" \
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: "=r" (err), "=r" (x) \
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: "r" (addr), "g" (-EFAULT), "0" (err))
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#define __get_user_asm_64(x, addr, err) \
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__asm__ __volatile__( \
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" move.d [%2],%M1\n" \
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"2: move.d [%2+4],%H1\n" \
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"4:\n" \
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" .section .fixup,\"ax\"\n" \
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"3: move.d %3,%0\n" \
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" moveq 0,%1\n" \
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" jump 4b\n" \
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" .previous\n" \
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" .section __ex_table,\"a\"\n" \
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" .dword 2b,3b\n" \
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" .dword 4b,3b\n" \
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" .previous\n" \
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: "=r" (err), "=r" (x) \
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: "r" (addr), "g" (-EFAULT), "0" (err))
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/*
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* Copy a null terminated string from userspace.
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*
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* Must return:
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* -EFAULT for an exception
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* count if we hit the buffer limit
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* bytes copied if we hit a null byte
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* (without the null byte)
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*/
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static inline long
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__do_strncpy_from_user(char *dst, const char *src, long count)
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{
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long res;
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if (count == 0)
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return 0;
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/*
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* Currently, in 2.4.0-test9, most ports use a simple byte-copy loop.
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* So do we.
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*
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* This code is deduced from:
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*
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* char tmp2;
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* long tmp1, tmp3
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* tmp1 = count;
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* while ((*dst++ = (tmp2 = *src++)) != 0
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* && --tmp1)
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* ;
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*
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* res = count - tmp1;
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*
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* with tweaks.
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*/
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__asm__ __volatile__ (
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" move.d %3,%0\n"
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" move.b [%2+],$r9\n"
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"1: beq 2f\n"
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" move.b $r9,[%1+]\n"
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" subq 1,%0\n"
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" bne 1b\n"
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" move.b [%2+],$r9\n"
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"2: sub.d %3,%0\n"
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" neg.d %0,%0\n"
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"3:\n"
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" .section .fixup,\"ax\"\n"
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"4: move.d %7,%0\n"
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" jump 3b\n"
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/* There's one address for a fault at the first move, and
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two possible PC values for a fault at the second move,
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being a delay-slot filler. However, the branch-target
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for the second move is the same as the first address.
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Just so you don't get confused... */
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" .previous\n"
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" .section __ex_table,\"a\"\n"
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" .dword 1b,4b\n"
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" .dword 2b,4b\n"
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" .previous"
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: "=r" (res), "=r" (dst), "=r" (src), "=r" (count)
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: "3" (count), "1" (dst), "2" (src), "g" (-EFAULT)
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: "r9");
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return res;
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}
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/* A few copy asms to build up the more complex ones from.
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Note again, a post-increment is performed regardless of whether a bus
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fault occurred in that instruction, and PC for a faulted insn is the
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address *after* the insn. */
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#define __asm_copy_user_cont(to, from, ret, COPY, FIXUP, TENTRY) \
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__asm__ __volatile__ ( \
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COPY \
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"1:\n" \
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" .section .fixup,\"ax\"\n" \
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FIXUP \
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" jump 1b\n" \
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" .previous\n" \
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" .section __ex_table,\"a\"\n" \
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TENTRY \
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" .previous\n" \
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: "=r" (to), "=r" (from), "=r" (ret) \
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: "0" (to), "1" (from), "2" (ret) \
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: "r9", "memory")
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#define __asm_copy_from_user_1(to, from, ret) \
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__asm_copy_user_cont(to, from, ret, \
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" move.b [%1+],$r9\n" \
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"2: move.b $r9,[%0+]\n", \
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"3: addq 1,%2\n" \
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" clear.b [%0+]\n", \
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" .dword 2b,3b\n")
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#define __asm_copy_from_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
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__asm_copy_user_cont(to, from, ret, \
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" move.w [%1+],$r9\n" \
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"2: move.w $r9,[%0+]\n" COPY, \
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"3: addq 2,%2\n" \
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" clear.w [%0+]\n" FIXUP, \
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" .dword 2b,3b\n" TENTRY)
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#define __asm_copy_from_user_2(to, from, ret) \
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__asm_copy_from_user_2x_cont(to, from, ret, "", "", "")
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#define __asm_copy_from_user_3(to, from, ret) \
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__asm_copy_from_user_2x_cont(to, from, ret, \
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" move.b [%1+],$r9\n" \
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"4: move.b $r9,[%0+]\n", \
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"5: addq 1,%2\n" \
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" clear.b [%0+]\n", \
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" .dword 4b,5b\n")
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#define __asm_copy_from_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
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__asm_copy_user_cont(to, from, ret, \
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" move.d [%1+],$r9\n" \
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"2: move.d $r9,[%0+]\n" COPY, \
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"3: addq 4,%2\n" \
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" clear.d [%0+]\n" FIXUP, \
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" .dword 2b,3b\n" TENTRY)
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#define __asm_copy_from_user_4(to, from, ret) \
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__asm_copy_from_user_4x_cont(to, from, ret, "", "", "")
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#define __asm_copy_from_user_5(to, from, ret) \
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__asm_copy_from_user_4x_cont(to, from, ret, \
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" move.b [%1+],$r9\n" \
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"4: move.b $r9,[%0+]\n", \
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"5: addq 1,%2\n" \
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" clear.b [%0+]\n", \
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" .dword 4b,5b\n")
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#define __asm_copy_from_user_6x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
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__asm_copy_from_user_4x_cont(to, from, ret, \
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" move.w [%1+],$r9\n" \
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"4: move.w $r9,[%0+]\n" COPY, \
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"5: addq 2,%2\n" \
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" clear.w [%0+]\n" FIXUP, \
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" .dword 4b,5b\n" TENTRY)
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#define __asm_copy_from_user_6(to, from, ret) \
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__asm_copy_from_user_6x_cont(to, from, ret, "", "", "")
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#define __asm_copy_from_user_7(to, from, ret) \
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__asm_copy_from_user_6x_cont(to, from, ret, \
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" move.b [%1+],$r9\n" \
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"6: move.b $r9,[%0+]\n", \
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"7: addq 1,%2\n" \
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" clear.b [%0+]\n", \
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" .dword 6b,7b\n")
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#define __asm_copy_from_user_8x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
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__asm_copy_from_user_4x_cont(to, from, ret, \
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" move.d [%1+],$r9\n" \
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"4: move.d $r9,[%0+]\n" COPY, \
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"5: addq 4,%2\n" \
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" clear.d [%0+]\n" FIXUP, \
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" .dword 4b,5b\n" TENTRY)
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#define __asm_copy_from_user_8(to, from, ret) \
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__asm_copy_from_user_8x_cont(to, from, ret, "", "", "")
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#define __asm_copy_from_user_9(to, from, ret) \
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__asm_copy_from_user_8x_cont(to, from, ret, \
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" move.b [%1+],$r9\n" \
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"6: move.b $r9,[%0+]\n", \
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"7: addq 1,%2\n" \
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" clear.b [%0+]\n", \
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" .dword 6b,7b\n")
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#define __asm_copy_from_user_10x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
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__asm_copy_from_user_8x_cont(to, from, ret, \
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" move.w [%1+],$r9\n" \
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"6: move.w $r9,[%0+]\n" COPY, \
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"7: addq 2,%2\n" \
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" clear.w [%0+]\n" FIXUP, \
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" .dword 6b,7b\n" TENTRY)
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#define __asm_copy_from_user_10(to, from, ret) \
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__asm_copy_from_user_10x_cont(to, from, ret, "", "", "")
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#define __asm_copy_from_user_11(to, from, ret) \
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__asm_copy_from_user_10x_cont(to, from, ret, \
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" move.b [%1+],$r9\n" \
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"8: move.b $r9,[%0+]\n", \
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"9: addq 1,%2\n" \
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" clear.b [%0+]\n", \
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" .dword 8b,9b\n")
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#define __asm_copy_from_user_12x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
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__asm_copy_from_user_8x_cont(to, from, ret, \
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" move.d [%1+],$r9\n" \
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"6: move.d $r9,[%0+]\n" COPY, \
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"7: addq 4,%2\n" \
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" clear.d [%0+]\n" FIXUP, \
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" .dword 6b,7b\n" TENTRY)
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#define __asm_copy_from_user_12(to, from, ret) \
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__asm_copy_from_user_12x_cont(to, from, ret, "", "", "")
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#define __asm_copy_from_user_13(to, from, ret) \
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__asm_copy_from_user_12x_cont(to, from, ret, \
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" move.b [%1+],$r9\n" \
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"8: move.b $r9,[%0+]\n", \
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"9: addq 1,%2\n" \
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" clear.b [%0+]\n", \
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" .dword 8b,9b\n")
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#define __asm_copy_from_user_14x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
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__asm_copy_from_user_12x_cont(to, from, ret, \
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" move.w [%1+],$r9\n" \
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"8: move.w $r9,[%0+]\n" COPY, \
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"9: addq 2,%2\n" \
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" clear.w [%0+]\n" FIXUP, \
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" .dword 8b,9b\n" TENTRY)
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#define __asm_copy_from_user_14(to, from, ret) \
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__asm_copy_from_user_14x_cont(to, from, ret, "", "", "")
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#define __asm_copy_from_user_15(to, from, ret) \
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__asm_copy_from_user_14x_cont(to, from, ret, \
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" move.b [%1+],$r9\n" \
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"10: move.b $r9,[%0+]\n", \
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"11: addq 1,%2\n" \
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" clear.b [%0+]\n", \
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" .dword 10b,11b\n")
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#define __asm_copy_from_user_16x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
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__asm_copy_from_user_12x_cont(to, from, ret, \
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" move.d [%1+],$r9\n" \
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"8: move.d $r9,[%0+]\n" COPY, \
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"9: addq 4,%2\n" \
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" clear.d [%0+]\n" FIXUP, \
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" .dword 8b,9b\n" TENTRY)
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#define __asm_copy_from_user_16(to, from, ret) \
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__asm_copy_from_user_16x_cont(to, from, ret, "", "", "")
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#define __asm_copy_from_user_20x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
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__asm_copy_from_user_16x_cont(to, from, ret, \
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" move.d [%1+],$r9\n" \
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"10: move.d $r9,[%0+]\n" COPY, \
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"11: addq 4,%2\n" \
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" clear.d [%0+]\n" FIXUP, \
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" .dword 10b,11b\n" TENTRY)
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#define __asm_copy_from_user_20(to, from, ret) \
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__asm_copy_from_user_20x_cont(to, from, ret, "", "", "")
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#define __asm_copy_from_user_24x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
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__asm_copy_from_user_20x_cont(to, from, ret, \
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" move.d [%1+],$r9\n" \
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"12: move.d $r9,[%0+]\n" COPY, \
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"13: addq 4,%2\n" \
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" clear.d [%0+]\n" FIXUP, \
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" .dword 12b,13b\n" TENTRY)
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#define __asm_copy_from_user_24(to, from, ret) \
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__asm_copy_from_user_24x_cont(to, from, ret, "", "", "")
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/* And now, the to-user ones. */
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#define __asm_copy_to_user_1(to, from, ret) \
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__asm_copy_user_cont(to, from, ret, \
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" move.b [%1+],$r9\n" \
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" move.b $r9,[%0+]\n2:\n", \
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"3: addq 1,%2\n", \
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" .dword 2b,3b\n")
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#define __asm_copy_to_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
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__asm_copy_user_cont(to, from, ret, \
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" move.w [%1+],$r9\n" \
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" move.w $r9,[%0+]\n2:\n" COPY, \
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"3: addq 2,%2\n" FIXUP, \
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" .dword 2b,3b\n" TENTRY)
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#define __asm_copy_to_user_2(to, from, ret) \
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__asm_copy_to_user_2x_cont(to, from, ret, "", "", "")
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#define __asm_copy_to_user_3(to, from, ret) \
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__asm_copy_to_user_2x_cont(to, from, ret, \
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" move.b [%1+],$r9\n" \
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" move.b $r9,[%0+]\n4:\n", \
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"5: addq 1,%2\n", \
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" .dword 4b,5b\n")
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#define __asm_copy_to_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
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__asm_copy_user_cont(to, from, ret, \
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" move.d [%1+],$r9\n" \
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" move.d $r9,[%0+]\n2:\n" COPY, \
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"3: addq 4,%2\n" FIXUP, \
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" .dword 2b,3b\n" TENTRY)
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#define __asm_copy_to_user_4(to, from, ret) \
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__asm_copy_to_user_4x_cont(to, from, ret, "", "", "")
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#define __asm_copy_to_user_5(to, from, ret) \
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__asm_copy_to_user_4x_cont(to, from, ret, \
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" move.b [%1+],$r9\n" \
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" move.b $r9,[%0+]\n4:\n", \
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"5: addq 1,%2\n", \
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" .dword 4b,5b\n")
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#define __asm_copy_to_user_6x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
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__asm_copy_to_user_4x_cont(to, from, ret, \
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" move.w [%1+],$r9\n" \
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" move.w $r9,[%0+]\n4:\n" COPY, \
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"5: addq 2,%2\n" FIXUP, \
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" .dword 4b,5b\n" TENTRY)
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#define __asm_copy_to_user_6(to, from, ret) \
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__asm_copy_to_user_6x_cont(to, from, ret, "", "", "")
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#define __asm_copy_to_user_7(to, from, ret) \
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__asm_copy_to_user_6x_cont(to, from, ret, \
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" move.b [%1+],$r9\n" \
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" move.b $r9,[%0+]\n6:\n", \
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"7: addq 1,%2\n", \
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" .dword 6b,7b\n")
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#define __asm_copy_to_user_8x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
|
|
__asm_copy_to_user_4x_cont(to, from, ret, \
|
|
" move.d [%1+],$r9\n" \
|
|
" move.d $r9,[%0+]\n4:\n" COPY, \
|
|
"5: addq 4,%2\n" FIXUP, \
|
|
" .dword 4b,5b\n" TENTRY)
|
|
|
|
#define __asm_copy_to_user_8(to, from, ret) \
|
|
__asm_copy_to_user_8x_cont(to, from, ret, "", "", "")
|
|
|
|
#define __asm_copy_to_user_9(to, from, ret) \
|
|
__asm_copy_to_user_8x_cont(to, from, ret, \
|
|
" move.b [%1+],$r9\n" \
|
|
" move.b $r9,[%0+]\n6:\n", \
|
|
"7: addq 1,%2\n", \
|
|
" .dword 6b,7b\n")
|
|
|
|
#define __asm_copy_to_user_10x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
|
|
__asm_copy_to_user_8x_cont(to, from, ret, \
|
|
" move.w [%1+],$r9\n" \
|
|
" move.w $r9,[%0+]\n6:\n" COPY, \
|
|
"7: addq 2,%2\n" FIXUP, \
|
|
" .dword 6b,7b\n" TENTRY)
|
|
|
|
#define __asm_copy_to_user_10(to, from, ret) \
|
|
__asm_copy_to_user_10x_cont(to, from, ret, "", "", "")
|
|
|
|
#define __asm_copy_to_user_11(to, from, ret) \
|
|
__asm_copy_to_user_10x_cont(to, from, ret, \
|
|
" move.b [%1+],$r9\n" \
|
|
" move.b $r9,[%0+]\n8:\n", \
|
|
"9: addq 1,%2\n", \
|
|
" .dword 8b,9b\n")
|
|
|
|
#define __asm_copy_to_user_12x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
|
|
__asm_copy_to_user_8x_cont(to, from, ret, \
|
|
" move.d [%1+],$r9\n" \
|
|
" move.d $r9,[%0+]\n6:\n" COPY, \
|
|
"7: addq 4,%2\n" FIXUP, \
|
|
" .dword 6b,7b\n" TENTRY)
|
|
|
|
#define __asm_copy_to_user_12(to, from, ret) \
|
|
__asm_copy_to_user_12x_cont(to, from, ret, "", "", "")
|
|
|
|
#define __asm_copy_to_user_13(to, from, ret) \
|
|
__asm_copy_to_user_12x_cont(to, from, ret, \
|
|
" move.b [%1+],$r9\n" \
|
|
" move.b $r9,[%0+]\n8:\n", \
|
|
"9: addq 1,%2\n", \
|
|
" .dword 8b,9b\n")
|
|
|
|
#define __asm_copy_to_user_14x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
|
|
__asm_copy_to_user_12x_cont(to, from, ret, \
|
|
" move.w [%1+],$r9\n" \
|
|
" move.w $r9,[%0+]\n8:\n" COPY, \
|
|
"9: addq 2,%2\n" FIXUP, \
|
|
" .dword 8b,9b\n" TENTRY)
|
|
|
|
#define __asm_copy_to_user_14(to, from, ret) \
|
|
__asm_copy_to_user_14x_cont(to, from, ret, "", "", "")
|
|
|
|
#define __asm_copy_to_user_15(to, from, ret) \
|
|
__asm_copy_to_user_14x_cont(to, from, ret, \
|
|
" move.b [%1+],$r9\n" \
|
|
" move.b $r9,[%0+]\n10:\n", \
|
|
"11: addq 1,%2\n", \
|
|
" .dword 10b,11b\n")
|
|
|
|
#define __asm_copy_to_user_16x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
|
|
__asm_copy_to_user_12x_cont(to, from, ret, \
|
|
" move.d [%1+],$r9\n" \
|
|
" move.d $r9,[%0+]\n8:\n" COPY, \
|
|
"9: addq 4,%2\n" FIXUP, \
|
|
" .dword 8b,9b\n" TENTRY)
|
|
|
|
#define __asm_copy_to_user_16(to, from, ret) \
|
|
__asm_copy_to_user_16x_cont(to, from, ret, "", "", "")
|
|
|
|
#define __asm_copy_to_user_20x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
|
|
__asm_copy_to_user_16x_cont(to, from, ret, \
|
|
" move.d [%1+],$r9\n" \
|
|
" move.d $r9,[%0+]\n10:\n" COPY, \
|
|
"11: addq 4,%2\n" FIXUP, \
|
|
" .dword 10b,11b\n" TENTRY)
|
|
|
|
#define __asm_copy_to_user_20(to, from, ret) \
|
|
__asm_copy_to_user_20x_cont(to, from, ret, "", "", "")
|
|
|
|
#define __asm_copy_to_user_24x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
|
|
__asm_copy_to_user_20x_cont(to, from, ret, \
|
|
" move.d [%1+],$r9\n" \
|
|
" move.d $r9,[%0+]\n12:\n" COPY, \
|
|
"13: addq 4,%2\n" FIXUP, \
|
|
" .dword 12b,13b\n" TENTRY)
|
|
|
|
#define __asm_copy_to_user_24(to, from, ret) \
|
|
__asm_copy_to_user_24x_cont(to, from, ret, "", "", "")
|
|
|
|
/* Define a few clearing asms with exception handlers. */
|
|
|
|
/* This frame-asm is like the __asm_copy_user_cont one, but has one less
|
|
input. */
|
|
|
|
#define __asm_clear(to, ret, CLEAR, FIXUP, TENTRY) \
|
|
__asm__ __volatile__ ( \
|
|
CLEAR \
|
|
"1:\n" \
|
|
" .section .fixup,\"ax\"\n" \
|
|
FIXUP \
|
|
" jump 1b\n" \
|
|
" .previous\n" \
|
|
" .section __ex_table,\"a\"\n" \
|
|
TENTRY \
|
|
" .previous" \
|
|
: "=r" (to), "=r" (ret) \
|
|
: "0" (to), "1" (ret) \
|
|
: "memory")
|
|
|
|
#define __asm_clear_1(to, ret) \
|
|
__asm_clear(to, ret, \
|
|
" clear.b [%0+]\n2:\n", \
|
|
"3: addq 1,%1\n", \
|
|
" .dword 2b,3b\n")
|
|
|
|
#define __asm_clear_2(to, ret) \
|
|
__asm_clear(to, ret, \
|
|
" clear.w [%0+]\n2:\n", \
|
|
"3: addq 2,%1\n", \
|
|
" .dword 2b,3b\n")
|
|
|
|
#define __asm_clear_3(to, ret) \
|
|
__asm_clear(to, ret, \
|
|
" clear.w [%0+]\n" \
|
|
"2: clear.b [%0+]\n3:\n", \
|
|
"4: addq 2,%1\n" \
|
|
"5: addq 1,%1\n", \
|
|
" .dword 2b,4b\n" \
|
|
" .dword 3b,5b\n")
|
|
|
|
#define __asm_clear_4x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
|
|
__asm_clear(to, ret, \
|
|
" clear.d [%0+]\n2:\n" CLEAR, \
|
|
"3: addq 4,%1\n" FIXUP, \
|
|
" .dword 2b,3b\n" TENTRY)
|
|
|
|
#define __asm_clear_4(to, ret) \
|
|
__asm_clear_4x_cont(to, ret, "", "", "")
|
|
|
|
#define __asm_clear_8x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
|
|
__asm_clear_4x_cont(to, ret, \
|
|
" clear.d [%0+]\n4:\n" CLEAR, \
|
|
"5: addq 4,%1\n" FIXUP, \
|
|
" .dword 4b,5b\n" TENTRY)
|
|
|
|
#define __asm_clear_8(to, ret) \
|
|
__asm_clear_8x_cont(to, ret, "", "", "")
|
|
|
|
#define __asm_clear_12x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
|
|
__asm_clear_8x_cont(to, ret, \
|
|
" clear.d [%0+]\n6:\n" CLEAR, \
|
|
"7: addq 4,%1\n" FIXUP, \
|
|
" .dword 6b,7b\n" TENTRY)
|
|
|
|
#define __asm_clear_12(to, ret) \
|
|
__asm_clear_12x_cont(to, ret, "", "", "")
|
|
|
|
#define __asm_clear_16x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
|
|
__asm_clear_12x_cont(to, ret, \
|
|
" clear.d [%0+]\n8:\n" CLEAR, \
|
|
"9: addq 4,%1\n" FIXUP, \
|
|
" .dword 8b,9b\n" TENTRY)
|
|
|
|
#define __asm_clear_16(to, ret) \
|
|
__asm_clear_16x_cont(to, ret, "", "", "")
|
|
|
|
#define __asm_clear_20x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
|
|
__asm_clear_16x_cont(to, ret, \
|
|
" clear.d [%0+]\n10:\n" CLEAR, \
|
|
"11: addq 4,%1\n" FIXUP, \
|
|
" .dword 10b,11b\n" TENTRY)
|
|
|
|
#define __asm_clear_20(to, ret) \
|
|
__asm_clear_20x_cont(to, ret, "", "", "")
|
|
|
|
#define __asm_clear_24x_cont(to, ret, CLEAR, FIXUP, TENTRY) \
|
|
__asm_clear_20x_cont(to, ret, \
|
|
" clear.d [%0+]\n12:\n" CLEAR, \
|
|
"13: addq 4,%1\n" FIXUP, \
|
|
" .dword 12b,13b\n" TENTRY)
|
|
|
|
#define __asm_clear_24(to, ret) \
|
|
__asm_clear_24x_cont(to, ret, "", "", "")
|
|
|
|
/*
|
|
* Return the size of a string (including the ending 0)
|
|
*
|
|
* Return length of string in userspace including terminating 0
|
|
* or 0 for error. Return a value greater than N if too long.
|
|
*/
|
|
|
|
static inline long
|
|
strnlen_user(const char *s, long n)
|
|
{
|
|
long res, tmp1;
|
|
|
|
if (!access_ok(VERIFY_READ, s, 0))
|
|
return 0;
|
|
|
|
/*
|
|
* This code is deduced from:
|
|
*
|
|
* tmp1 = n;
|
|
* while (tmp1-- > 0 && *s++)
|
|
* ;
|
|
*
|
|
* res = n - tmp1;
|
|
*
|
|
* (with tweaks).
|
|
*/
|
|
|
|
__asm__ __volatile__ (
|
|
" move.d %1,$r9\n"
|
|
"0:\n"
|
|
" ble 1f\n"
|
|
" subq 1,$r9\n"
|
|
|
|
" test.b [%0+]\n"
|
|
" bne 0b\n"
|
|
" test.d $r9\n"
|
|
"1:\n"
|
|
" move.d %1,%0\n"
|
|
" sub.d $r9,%0\n"
|
|
"2:\n"
|
|
" .section .fixup,\"ax\"\n"
|
|
|
|
"3: clear.d %0\n"
|
|
" jump 2b\n"
|
|
|
|
/* There's one address for a fault at the first move, and
|
|
two possible PC values for a fault at the second move,
|
|
being a delay-slot filler. However, the branch-target
|
|
for the second move is the same as the first address.
|
|
Just so you don't get confused... */
|
|
" .previous\n"
|
|
" .section __ex_table,\"a\"\n"
|
|
" .dword 0b,3b\n"
|
|
" .dword 1b,3b\n"
|
|
" .previous\n"
|
|
: "=r" (res), "=r" (tmp1)
|
|
: "0" (s), "1" (n)
|
|
: "r9");
|
|
|
|
return res;
|
|
}
|
|
|
|
#endif
|