| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * 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 $r9,[%0+]\n", \ |
| "3: addq 1,%2\n", \ |
| " .dword 2b,3b\n") |
| |
| #define __asm_copy_from_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ |
| __asm_copy_user_cont(to, from, ret, \ |
| " move.w [%1+],$r9\n" \ |
| "2: move.w $r9,[%0+]\n" COPY, \ |
| "3: addq 2,%2\n" FIXUP, \ |
| " .dword 2b,3b\n" TENTRY) |
| |
| #define __asm_copy_from_user_2(to, from, ret) \ |
| __asm_copy_from_user_2x_cont(to, from, ret, "", "", "") |
| |
| #define __asm_copy_from_user_3(to, from, ret) \ |
| __asm_copy_from_user_2x_cont(to, from, ret, \ |
| " move.b [%1+],$r9\n" \ |
| "4: move.b $r9,[%0+]\n", \ |
| "5: addq 1,%2\n", \ |
| " .dword 4b,5b\n") |
| |
| #define __asm_copy_from_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ |
| __asm_copy_user_cont(to, from, ret, \ |
| " move.d [%1+],$r9\n" \ |
| "2: move.d $r9,[%0+]\n" COPY, \ |
| "3: addq 4,%2\n" FIXUP, \ |
| " .dword 2b,3b\n" TENTRY) |
| |
| #define __asm_copy_from_user_4(to, from, ret) \ |
| __asm_copy_from_user_4x_cont(to, from, ret, "", "", "") |
| |
| #define __asm_copy_from_user_5(to, from, ret) \ |
| __asm_copy_from_user_4x_cont(to, from, ret, \ |
| " move.b [%1+],$r9\n" \ |
| "4: move.b $r9,[%0+]\n", \ |
| "5: addq 1,%2\n", \ |
| " .dword 4b,5b\n") |
| |
| #define __asm_copy_from_user_6x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ |
| __asm_copy_from_user_4x_cont(to, from, ret, \ |
| " move.w [%1+],$r9\n" \ |
| "4: move.w $r9,[%0+]\n" COPY, \ |
| "5: addq 2,%2\n" \ |
| FIXUP, \ |
| " .dword 4b,5b\n" TENTRY) |
| |
| #define __asm_copy_from_user_6(to, from, ret) \ |
| __asm_copy_from_user_6x_cont(to, from, ret, "", "", "") |
| |
| #define __asm_copy_from_user_7(to, from, ret) \ |
| __asm_copy_from_user_6x_cont(to, from, ret, \ |
| " move.b [%1+],$r9\n" \ |
| "6: move.b $r9,[%0+]\n", \ |
| "7: addq 1,%2\n", \ |
| " .dword 6b,7b\n") |
| |
| #define __asm_copy_from_user_8x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ |
| __asm_copy_from_user_4x_cont(to, from, ret, \ |
| " move.d [%1+],$r9\n" \ |
| "4: move.d $r9,[%0+]\n" COPY, \ |
| "5: addq 4,%2\n" \ |
| FIXUP, \ |
| " .dword 4b,5b\n" TENTRY) |
| |
| #define __asm_copy_from_user_8(to, from, ret) \ |
| __asm_copy_from_user_8x_cont(to, from, ret, "", "", "") |
| |
| #define __asm_copy_from_user_9(to, from, ret) \ |
| __asm_copy_from_user_8x_cont(to, from, ret, \ |
| " move.b [%1+],$r9\n" \ |
| "6: move.b $r9,[%0+]\n", \ |
| "7: addq 1,%2\n", \ |
| " .dword 6b,7b\n") |
| |
| #define __asm_copy_from_user_10x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ |
| __asm_copy_from_user_8x_cont(to, from, ret, \ |
| " move.w [%1+],$r9\n" \ |
| "6: move.w $r9,[%0+]\n" COPY, \ |
| "7: addq 2,%2\n" \ |
| FIXUP, \ |
| " .dword 6b,7b\n" TENTRY) |
| |
| #define __asm_copy_from_user_10(to, from, ret) \ |
| __asm_copy_from_user_10x_cont(to, from, ret, "", "", "") |
| |
| #define __asm_copy_from_user_11(to, from, ret) \ |
| __asm_copy_from_user_10x_cont(to, from, ret, \ |
| " move.b [%1+],$r9\n" \ |
| "8: move.b $r9,[%0+]\n", \ |
| "9: addq 1,%2\n", \ |
| " .dword 8b,9b\n") |
| |
| #define __asm_copy_from_user_12x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ |
| __asm_copy_from_user_8x_cont(to, from, ret, \ |
| " move.d [%1+],$r9\n" \ |
| "6: move.d $r9,[%0+]\n" COPY, \ |
| "7: addq 4,%2\n" \ |
| FIXUP, \ |
| " .dword 6b,7b\n" TENTRY) |
| |
| #define __asm_copy_from_user_12(to, from, ret) \ |
| __asm_copy_from_user_12x_cont(to, from, ret, "", "", "") |
| |
| #define __asm_copy_from_user_13(to, from, ret) \ |
| __asm_copy_from_user_12x_cont(to, from, ret, \ |
| " move.b [%1+],$r9\n" \ |
| "8: move.b $r9,[%0+]\n", \ |
| "9: addq 1,%2\n", \ |
| " .dword 8b,9b\n") |
| |
| #define __asm_copy_from_user_14x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ |
| __asm_copy_from_user_12x_cont(to, from, ret, \ |
| " move.w [%1+],$r9\n" \ |
| "8: move.w $r9,[%0+]\n" COPY, \ |
| "9: addq 2,%2\n" \ |
| FIXUP, \ |
| " .dword 8b,9b\n" TENTRY) |
| |
| #define __asm_copy_from_user_14(to, from, ret) \ |
| __asm_copy_from_user_14x_cont(to, from, ret, "", "", "") |
| |
| #define __asm_copy_from_user_15(to, from, ret) \ |
| __asm_copy_from_user_14x_cont(to, from, ret, \ |
| " move.b [%1+],$r9\n" \ |
| "10: move.b $r9,[%0+]\n", \ |
| "11: addq 1,%2\n", \ |
| " .dword 10b,11b\n") |
| |
| #define __asm_copy_from_user_16x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ |
| __asm_copy_from_user_12x_cont(to, from, ret, \ |
| " move.d [%1+],$r9\n" \ |
| "8: move.d $r9,[%0+]\n" COPY, \ |
| "9: addq 4,%2\n" \ |
| FIXUP, \ |
| " .dword 8b,9b\n" TENTRY) |
| |
| #define __asm_copy_from_user_16(to, from, ret) \ |
| __asm_copy_from_user_16x_cont(to, from, ret, "", "", "") |
| |
| #define __asm_copy_from_user_20x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ |
| __asm_copy_from_user_16x_cont(to, from, ret, \ |
| " move.d [%1+],$r9\n" \ |
| "10: move.d $r9,[%0+]\n" COPY, \ |
| "11: addq 4,%2\n" \ |
| FIXUP, \ |
| " .dword 10b,11b\n" TENTRY) |
| |
| #define __asm_copy_from_user_20(to, from, ret) \ |
| __asm_copy_from_user_20x_cont(to, from, ret, "", "", "") |
| |
| #define __asm_copy_from_user_24x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ |
| __asm_copy_from_user_20x_cont(to, from, ret, \ |
| " move.d [%1+],$r9\n" \ |
| "12: move.d $r9,[%0+]\n" COPY, \ |
| "13: addq 4,%2\n" \ |
| FIXUP, \ |
| " .dword 12b,13b\n" TENTRY) |
| |
| #define __asm_copy_from_user_24(to, from, ret) \ |
| __asm_copy_from_user_24x_cont(to, from, ret, "", "", "") |
| |
| /* And now, the to-user ones. */ |
| |
| #define __asm_copy_to_user_1(to, from, ret) \ |
| __asm_copy_user_cont(to, from, ret, \ |
| " move.b [%1+],$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 |
