diff options
Diffstat (limited to 'include/asm-cris/arch-v10/uaccess.h')
| -rw-r--r-- | include/asm-cris/arch-v10/uaccess.h | 660 |
1 files changed, 0 insertions, 660 deletions
diff --git a/include/asm-cris/arch-v10/uaccess.h b/include/asm-cris/arch-v10/uaccess.h deleted file mode 100644 index 65b02d9b605..00000000000 --- a/include/asm-cris/arch-v10/uaccess.h +++ /dev/null @@ -1,660 +0,0 @@ -/* - * Authors: Bjorn Wesen (bjornw@axis.com) - * Hans-Peter Nilsson (hp@axis.com) - * - */ -#ifndef _CRIS_ARCH_UACCESS_H -#define _CRIS_ARCH_UACCESS_H - -/* - * We don't tell gcc that we are accessing memory, but this is OK - * because we do not write to any memory gcc knows about, so there - * are no aliasing issues. - * - * Note that PC at a fault is the address *after* the faulting - * instruction. - */ -#define __put_user_asm(x, addr, err, op) \ - __asm__ __volatile__( \ - " "op" %1,[%2]\n" \ - "2:\n" \ - " .section .fixup,\"ax\"\n" \ - "3: move.d %3,%0\n" \ - " jump 2b\n" \ - " .previous\n" \ - " .section __ex_table,\"a\"\n" \ - " .dword 2b,3b\n" \ - " .previous\n" \ - : "=r" (err) \ - : "r" (x), "r" (addr), "g" (-EFAULT), "0" (err)) - -#define __put_user_asm_64(x, addr, err) \ - __asm__ __volatile__( \ - " move.d %M1,[%2]\n" \ - "2: move.d %H1,[%2+4]\n" \ - "4:\n" \ - " .section .fixup,\"ax\"\n" \ - "3: move.d %3,%0\n" \ - " jump 4b\n" \ - " .previous\n" \ - " .section __ex_table,\"a\"\n" \ - " .dword 2b,3b\n" \ - " .dword 4b,3b\n" \ - " .previous\n" \ - : "=r" (err) \ - : "r" (x), "r" (addr), "g" (-EFAULT), "0" (err)) - -/* See comment before __put_user_asm. */ - -#define __get_user_asm(x, addr, err, op) \ - __asm__ __volatile__( \ - " "op" [%2],%1\n" \ - "2:\n" \ - " .section .fixup,\"ax\"\n" \ - "3: move.d %3,%0\n" \ - " moveq 0,%1\n" \ - " jump 2b\n" \ - " .previous\n" \ - " .section __ex_table,\"a\"\n" \ - " .dword 2b,3b\n" \ - " .previous\n" \ - : "=r" (err), "=r" (x) \ - : "r" (addr), "g" (-EFAULT), "0" (err)) - -#define __get_user_asm_64(x, addr, err) \ - __asm__ __volatile__( \ - " move.d [%2],%M1\n" \ - "2: move.d [%2+4],%H1\n" \ - "4:\n" \ - " .section .fixup,\"ax\"\n" \ - "3: move.d %3,%0\n" \ - " moveq 0,%1\n" \ - " jump 4b\n" \ - " .previous\n" \ - " .section __ex_table,\"a\"\n" \ - " .dword 2b,3b\n" \ - " .dword 4b,3b\n" \ - " .previous\n" \ - : "=r" (err), "=r" (x) \ - : "r" (addr), "g" (-EFAULT), "0" (err)) - -/* - * Copy a null terminated string from userspace. - * - * Must return: - * -EFAULT for an exception - * count if we hit the buffer limit - * bytes copied if we hit a null byte - * (without the null byte) - */ -static inline long -__do_strncpy_from_user(char *dst, const char *src, long count) -{ - long res; - - if (count == 0) - return 0; - - /* - * Currently, in 2.4.0-test9, most ports use a simple byte-copy loop. - * So do we. - * - * This code is deduced from: - * - * char tmp2; - * long tmp1, tmp3 - * tmp1 = count; - * while ((*dst++ = (tmp2 = *src++)) != 0 - * && --tmp1) - * ; - * - * res = count - tmp1; - * - * with tweaks. - */ - - __asm__ __volatile__ ( - " move.d %3,%0\n" - " move.b [%2+],$r9\n" - "1: beq 2f\n" - " move.b $r9,[%1+]\n" - - " subq 1,%0\n" - " bne 1b\n" - " move.b [%2+],$r9\n" - - "2: sub.d %3,%0\n" - " neg.d %0,%0\n" - "3:\n" - " .section .fixup,\"ax\"\n" - "4: move.d %7,%0\n" - " jump 3b\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 1b,4b\n" - " .dword 2b,4b\n" - " .previous" - : "=r" (res), "=r" (dst), "=r" (src), "=r" (count) - : "3" (count), "1" (dst), "2" (src), "g" (-EFAULT) - : "r9"); - - return res; -} - -/* A few copy asms to build up the more complex ones from. - - Note again, a post-increment is performed regardless of whether a bus - fault occurred in that instruction, and PC for a faulted insn is the - address *after* the insn. */ - -#define __asm_copy_user_cont(to, from, ret, COPY, FIXUP, TENTRY) \ - __asm__ __volatile__ ( \ - COPY \ - "1:\n" \ - " .section .fixup,\"ax\"\n" \ - FIXUP \ - " jump 1b\n" \ - " .previous\n" \ - " .section __ex_table,\"a\"\n" \ - TENTRY \ - " .previous\n" \ - : "=r" (to), "=r" (from), "=r" (ret) \ - : "0" (to), "1" (from), "2" (ret) \ - : "r9", "memory") - -#define __asm_copy_from_user_1(to, from, ret) \ - __asm_copy_user_cont(to, from, ret, \ - " move.b [%1+],$r9\n" \ - "2: move.b $r9,[%0+]\n", \ - "3: addq 1,%2\n" \ - " clear.b [%0+]\n", \ - " .dword 2b,3b\n") - -#define __asm_copy_from_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ - __asm_copy_user_cont(to, from, ret, \ - " move.w [%1+],$r9\n" \ - "2: move.w $r9,[%0+]\n" COPY, \ - "3: addq 2,%2\n" \ - " clear.w [%0+]\n" FIXUP, \ - " .dword 2b,3b\n" TENTRY) - -#define __asm_copy_from_user_2(to, from, ret) \ - __asm_copy_from_user_2x_cont(to, from, ret, "", "", "") - -#define __asm_copy_from_user_3(to, from, ret) \ - __asm_copy_from_user_2x_cont(to, from, ret, \ - " move.b [%1+],$r9\n" \ - "4: move.b $r9,[%0+]\n", \ - "5: addq 1,%2\n" \ - " clear.b [%0+]\n", \ - " .dword 4b,5b\n") - -#define __asm_copy_from_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ - __asm_copy_user_cont(to, from, ret, \ - " move.d [%1+],$r9\n" \ - "2: move.d $r9,[%0+]\n" COPY, \ - "3: addq 4,%2\n" \ - " clear.d [%0+]\n" FIXUP, \ - " .dword 2b,3b\n" TENTRY) - -#define __asm_copy_from_user_4(to, from, ret) \ - __asm_copy_from_user_4x_cont(to, from, ret, "", "", "") - -#define __asm_copy_from_user_5(to, from, ret) \ - __asm_copy_from_user_4x_cont(to, from, ret, \ - " move.b [%1+],$r9\n" \ - "4: move.b $r9,[%0+]\n", \ - "5: addq 1,%2\n" \ - " clear.b [%0+]\n", \ - " .dword 4b,5b\n") - -#define __asm_copy_from_user_6x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ - __asm_copy_from_user_4x_cont(to, from, ret, \ - " move.w [%1+],$r9\n" \ - "4: move.w $r9,[%0+]\n" COPY, \ - "5: addq 2,%2\n" \ - " clear.w [%0+]\n" FIXUP, \ - " .dword 4b,5b\n" TENTRY) - -#define __asm_copy_from_user_6(to, from, ret) \ - __asm_copy_from_user_6x_cont(to, from, ret, "", "", "") - -#define __asm_copy_from_user_7(to, from, ret) \ - __asm_copy_from_user_6x_cont(to, from, ret, \ - " move.b [%1+],$r9\n" \ - "6: move.b $r9,[%0+]\n", \ - "7: addq 1,%2\n" \ - " clear.b [%0+]\n", \ - " .dword 6b,7b\n") - -#define __asm_copy_from_user_8x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ - __asm_copy_from_user_4x_cont(to, from, ret, \ - " move.d [%1+],$r9\n" \ - "4: move.d $r9,[%0+]\n" COPY, \ - "5: addq 4,%2\n" \ - " clear.d [%0+]\n" FIXUP, \ - " .dword 4b,5b\n" TENTRY) - -#define __asm_copy_from_user_8(to, from, ret) \ - __asm_copy_from_user_8x_cont(to, from, ret, "", "", "") - -#define __asm_copy_from_user_9(to, from, ret) \ - __asm_copy_from_user_8x_cont(to, from, ret, \ - " move.b [%1+],$r9\n" \ - "6: move.b $r9,[%0+]\n", \ - "7: addq 1,%2\n" \ - " clear.b [%0+]\n", \ - " .dword 6b,7b\n") - -#define __asm_copy_from_user_10x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ - __asm_copy_from_user_8x_cont(to, from, ret, \ - " move.w [%1+],$r9\n" \ - "6: move.w $r9,[%0+]\n" COPY, \ - "7: addq 2,%2\n" \ - " clear.w [%0+]\n" FIXUP, \ - " .dword 6b,7b\n" TENTRY) - -#define __asm_copy_from_user_10(to, from, ret) \ - __asm_copy_from_user_10x_cont(to, from, ret, "", "", "") - -#define __asm_copy_from_user_11(to, from, ret) \ - __asm_copy_from_user_10x_cont(to, from, ret, \ - " move.b [%1+],$r9\n" \ - "8: move.b $r9,[%0+]\n", \ - "9: addq 1,%2\n" \ - " clear.b [%0+]\n", \ - " .dword 8b,9b\n") - -#define __asm_copy_from_user_12x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ - __asm_copy_from_user_8x_cont(to, from, ret, \ - " move.d [%1+],$r9\n" \ - "6: move.d $r9,[%0+]\n" COPY, \ - "7: addq 4,%2\n" \ - " clear.d [%0+]\n" FIXUP, \ - " .dword 6b,7b\n" TENTRY) - -#define __asm_copy_from_user_12(to, from, ret) \ - __asm_copy_from_user_12x_cont(to, from, ret, "", "", "") - -#define __asm_copy_from_user_13(to, from, ret) \ - __asm_copy_from_user_12x_cont(to, from, ret, \ - " move.b [%1+],$r9\n" \ - "8: move.b $r9,[%0+]\n", \ - "9: addq 1,%2\n" \ - " clear.b [%0+]\n", \ - " .dword 8b,9b\n") - -#define __asm_copy_from_user_14x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ - __asm_copy_from_user_12x_cont(to, from, ret, \ - " move.w [%1+],$r9\n" \ - "8: move.w $r9,[%0+]\n" COPY, \ - "9: addq 2,%2\n" \ - " clear.w [%0+]\n" FIXUP, \ - " .dword 8b,9b\n" TENTRY) - -#define __asm_copy_from_user_14(to, from, ret) \ - __asm_copy_from_user_14x_cont(to, from, ret, "", "", "") - -#define __asm_copy_from_user_15(to, from, ret) \ - __asm_copy_from_user_14x_cont(to, from, ret, \ - " move.b [%1+],$r9\n" \ - "10: move.b $r9,[%0+]\n", \ - "11: addq 1,%2\n" \ - " clear.b [%0+]\n", \ - " .dword 10b,11b\n") - -#define __asm_copy_from_user_16x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ - __asm_copy_from_user_12x_cont(to, from, ret, \ - " move.d [%1+],$r9\n" \ - "8: move.d $r9,[%0+]\n" COPY, \ - "9: addq 4,%2\n" \ - " clear.d [%0+]\n" FIXUP, \ - " .dword 8b,9b\n" TENTRY) - -#define __asm_copy_from_user_16(to, from, ret) \ - __asm_copy_from_user_16x_cont(to, from, ret, "", "", "") - -#define __asm_copy_from_user_20x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ - __asm_copy_from_user_16x_cont(to, from, ret, \ - " move.d [%1+],$r9\n" \ - "10: move.d $r9,[%0+]\n" COPY, \ - "11: addq 4,%2\n" \ - " clear.d [%0+]\n" FIXUP, \ - " .dword 10b,11b\n" TENTRY) - -#define __asm_copy_from_user_20(to, from, ret) \ - __asm_copy_from_user_20x_cont(to, from, ret, "", "", "") - -#define __asm_copy_from_user_24x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ - __asm_copy_from_user_20x_cont(to, from, ret, \ - " move.d [%1+],$r9\n" \ - "12: move.d $r9,[%0+]\n" COPY, \ - "13: addq 4,%2\n" \ - " clear.d [%0+]\n" FIXUP, \ - " .dword 12b,13b\n" TENTRY) - -#define __asm_copy_from_user_24(to, from, ret) \ - __asm_copy_from_user_24x_cont(to, from, ret, "", "", "") - -/* And now, the to-user ones. */ - -#define __asm_copy_to_user_1(to, from, ret) \ - __asm_copy_user_cont(to, from, ret, \ - " move.b [%1+],$r9\n" \ - " move.b $r9,[%0+]\n2:\n", \ - "3: addq 1,%2\n", \ - " .dword 2b,3b\n") - -#define __asm_copy_to_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ - __asm_copy_user_cont(to, from, ret, \ - " move.w [%1+],$r9\n" \ - " move.w $r9,[%0+]\n2:\n" COPY, \ - "3: addq 2,%2\n" FIXUP, \ - " .dword 2b,3b\n" TENTRY) - -#define __asm_copy_to_user_2(to, from, ret) \ - __asm_copy_to_user_2x_cont(to, from, ret, "", "", "") - -#define __asm_copy_to_user_3(to, from, ret) \ - __asm_copy_to_user_2x_cont(to, from, ret, \ - " move.b [%1+],$r9\n" \ - " move.b $r9,[%0+]\n4:\n", \ - "5: addq 1,%2\n", \ - " .dword 4b,5b\n") - -#define __asm_copy_to_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ - __asm_copy_user_cont(to, from, ret, \ - " move.d [%1+],$r9\n" \ - " move.d $r9,[%0+]\n2:\n" COPY, \ - "3: addq 4,%2\n" FIXUP, \ - " .dword 2b,3b\n" TENTRY) - -#define __asm_copy_to_user_4(to, from, ret) \ - __asm_copy_to_user_4x_cont(to, from, ret, "", "", "") - -#define __asm_copy_to_user_5(to, from, ret) \ - __asm_copy_to_user_4x_cont(to, from, ret, \ - " move.b [%1+],$r9\n" \ - " move.b $r9,[%0+]\n4:\n", \ - "5: addq 1,%2\n", \ - " .dword 4b,5b\n") - -#define __asm_copy_to_user_6x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ - __asm_copy_to_user_4x_cont(to, from, ret, \ - " move.w [%1+],$r9\n" \ - " move.w $r9,[%0+]\n4:\n" COPY, \ - "5: addq 2,%2\n" FIXUP, \ - " .dword 4b,5b\n" TENTRY) - -#define __asm_copy_to_user_6(to, from, ret) \ - __asm_copy_to_user_6x_cont(to, from, ret, "", "", "") - -#define __asm_copy_to_user_7(to, from, ret) \ - __asm_copy_to_user_6x_cont(to, from, ret, \ - " move.b [%1+],$r9\n" \ - " move.b $r9,[%0+]\n6:\n", \ - "7: addq 1,%2\n", \ - " .dword 6b,7b\n") - -#define __asm_copy_to_user_8x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ - __asm_copy_to_user_4x_cont(to, from, ret, \ - " move.d [%1+],$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 |