639 lines
16 KiB
C
639 lines
16 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
|
|
*
|
|
* vineetg: June 2010
|
|
* -__clear_user( ) called multiple times during elf load was byte loop
|
|
* converted to do as much word clear as possible.
|
|
*
|
|
* vineetg: Dec 2009
|
|
* -Hand crafted constant propagation for "constant" copy sizes
|
|
* -stock kernel shrunk by 33K at -O3
|
|
*
|
|
* vineetg: Sept 2009
|
|
* -Added option to (UN)inline copy_(to|from)_user to reduce code sz
|
|
* -kernel shrunk by 200K even at -O3 (gcc 4.2.1)
|
|
* -Enabled when doing -Os
|
|
*
|
|
* Amit Bhor, Sameer Dhavale: Codito Technologies 2004
|
|
*/
|
|
|
|
#ifndef _ASM_ARC_UACCESS_H
|
|
#define _ASM_ARC_UACCESS_H
|
|
|
|
#include <linux/string.h> /* for generic string functions */
|
|
|
|
/*********** Single byte/hword/word copies ******************/
|
|
|
|
#define __get_user_fn(sz, u, k) \
|
|
({ \
|
|
long __ret = 0; /* success by default */ \
|
|
switch (sz) { \
|
|
case 1: __arc_get_user_one(*(k), u, "ldb", __ret); break; \
|
|
case 2: __arc_get_user_one(*(k), u, "ldw", __ret); break; \
|
|
case 4: __arc_get_user_one(*(k), u, "ld", __ret); break; \
|
|
case 8: __arc_get_user_one_64(*(k), u, __ret); break; \
|
|
} \
|
|
__ret; \
|
|
})
|
|
|
|
/*
|
|
* Returns 0 on success, -EFAULT if not.
|
|
* @ret already contains 0 - given that errors will be less likely
|
|
* (hence +r asm constraint below).
|
|
* In case of error, fixup code will make it -EFAULT
|
|
*/
|
|
#define __arc_get_user_one(dst, src, op, ret) \
|
|
__asm__ __volatile__( \
|
|
"1: "op" %1,[%2]\n" \
|
|
"2: ;nop\n" \
|
|
" .section .fixup, \"ax\"\n" \
|
|
" .align 4\n" \
|
|
"3: # return -EFAULT\n" \
|
|
" mov %0, %3\n" \
|
|
" # zero out dst ptr\n" \
|
|
" mov %1, 0\n" \
|
|
" j 2b\n" \
|
|
" .previous\n" \
|
|
" .section __ex_table, \"a\"\n" \
|
|
" .align 4\n" \
|
|
" .word 1b,3b\n" \
|
|
" .previous\n" \
|
|
\
|
|
: "+r" (ret), "=r" (dst) \
|
|
: "r" (src), "ir" (-EFAULT))
|
|
|
|
#define __arc_get_user_one_64(dst, src, ret) \
|
|
__asm__ __volatile__( \
|
|
"1: ld %1,[%2]\n" \
|
|
"4: ld %R1,[%2, 4]\n" \
|
|
"2: ;nop\n" \
|
|
" .section .fixup, \"ax\"\n" \
|
|
" .align 4\n" \
|
|
"3: # return -EFAULT\n" \
|
|
" mov %0, %3\n" \
|
|
" # zero out dst ptr\n" \
|
|
" mov %1, 0\n" \
|
|
" mov %R1, 0\n" \
|
|
" j 2b\n" \
|
|
" .previous\n" \
|
|
" .section __ex_table, \"a\"\n" \
|
|
" .align 4\n" \
|
|
" .word 1b,3b\n" \
|
|
" .word 4b,3b\n" \
|
|
" .previous\n" \
|
|
\
|
|
: "+r" (ret), "=r" (dst) \
|
|
: "r" (src), "ir" (-EFAULT))
|
|
|
|
#define __put_user_fn(sz, u, k) \
|
|
({ \
|
|
long __ret = 0; /* success by default */ \
|
|
switch (sz) { \
|
|
case 1: __arc_put_user_one(*(k), u, "stb", __ret); break; \
|
|
case 2: __arc_put_user_one(*(k), u, "stw", __ret); break; \
|
|
case 4: __arc_put_user_one(*(k), u, "st", __ret); break; \
|
|
case 8: __arc_put_user_one_64(*(k), u, __ret); break; \
|
|
} \
|
|
__ret; \
|
|
})
|
|
|
|
#define __arc_put_user_one(src, dst, op, ret) \
|
|
__asm__ __volatile__( \
|
|
"1: "op" %1,[%2]\n" \
|
|
"2: ;nop\n" \
|
|
" .section .fixup, \"ax\"\n" \
|
|
" .align 4\n" \
|
|
"3: mov %0, %3\n" \
|
|
" j 2b\n" \
|
|
" .previous\n" \
|
|
" .section __ex_table, \"a\"\n" \
|
|
" .align 4\n" \
|
|
" .word 1b,3b\n" \
|
|
" .previous\n" \
|
|
\
|
|
: "+r" (ret) \
|
|
: "r" (src), "r" (dst), "ir" (-EFAULT))
|
|
|
|
#define __arc_put_user_one_64(src, dst, ret) \
|
|
__asm__ __volatile__( \
|
|
"1: st %1,[%2]\n" \
|
|
"4: st %R1,[%2, 4]\n" \
|
|
"2: ;nop\n" \
|
|
" .section .fixup, \"ax\"\n" \
|
|
" .align 4\n" \
|
|
"3: mov %0, %3\n" \
|
|
" j 2b\n" \
|
|
" .previous\n" \
|
|
" .section __ex_table, \"a\"\n" \
|
|
" .align 4\n" \
|
|
" .word 1b,3b\n" \
|
|
" .word 4b,3b\n" \
|
|
" .previous\n" \
|
|
\
|
|
: "+r" (ret) \
|
|
: "r" (src), "r" (dst), "ir" (-EFAULT))
|
|
|
|
|
|
static inline unsigned long
|
|
raw_copy_from_user(void *to, const void __user *from, unsigned long n)
|
|
{
|
|
long res = 0;
|
|
char val;
|
|
unsigned long tmp1, tmp2, tmp3, tmp4;
|
|
unsigned long orig_n = n;
|
|
|
|
if (n == 0)
|
|
return 0;
|
|
|
|
/* fallback for unaligned access when hardware doesn't support */
|
|
if (!IS_ENABLED(CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS) &&
|
|
(((unsigned long)to & 0x3) || ((unsigned long)from & 0x3))) {
|
|
|
|
unsigned char tmp;
|
|
|
|
__asm__ __volatile__ (
|
|
" mov.f lp_count, %0 \n"
|
|
" lpnz 2f \n"
|
|
"1: ldb.ab %1, [%3, 1] \n"
|
|
" stb.ab %1, [%2, 1] \n"
|
|
" sub %0,%0,1 \n"
|
|
"2: ;nop \n"
|
|
" .section .fixup, \"ax\" \n"
|
|
" .align 4 \n"
|
|
"3: j 2b \n"
|
|
" .previous \n"
|
|
" .section __ex_table, \"a\" \n"
|
|
" .align 4 \n"
|
|
" .word 1b, 3b \n"
|
|
" .previous \n"
|
|
|
|
: "+r" (n),
|
|
/*
|
|
* Note as an '&' earlyclobber operand to make sure the
|
|
* temporary register inside the loop is not the same as
|
|
* FROM or TO.
|
|
*/
|
|
"=&r" (tmp), "+r" (to), "+r" (from)
|
|
:
|
|
: "lp_count", "memory");
|
|
|
|
return n;
|
|
}
|
|
|
|
/*
|
|
* Hand-crafted constant propagation to reduce code sz of the
|
|
* laddered copy 16x,8,4,2,1
|
|
*/
|
|
if (__builtin_constant_p(orig_n)) {
|
|
res = orig_n;
|
|
|
|
if (orig_n / 16) {
|
|
orig_n = orig_n % 16;
|
|
|
|
__asm__ __volatile__(
|
|
" lsr lp_count, %7,4 \n"
|
|
" lp 3f \n"
|
|
"1: ld.ab %3, [%2, 4] \n"
|
|
"11: ld.ab %4, [%2, 4] \n"
|
|
"12: ld.ab %5, [%2, 4] \n"
|
|
"13: ld.ab %6, [%2, 4] \n"
|
|
" st.ab %3, [%1, 4] \n"
|
|
" st.ab %4, [%1, 4] \n"
|
|
" st.ab %5, [%1, 4] \n"
|
|
" st.ab %6, [%1, 4] \n"
|
|
" sub %0,%0,16 \n"
|
|
"3: ;nop \n"
|
|
" .section .fixup, \"ax\" \n"
|
|
" .align 4 \n"
|
|
"4: j 3b \n"
|
|
" .previous \n"
|
|
" .section __ex_table, \"a\" \n"
|
|
" .align 4 \n"
|
|
" .word 1b, 4b \n"
|
|
" .word 11b,4b \n"
|
|
" .word 12b,4b \n"
|
|
" .word 13b,4b \n"
|
|
" .previous \n"
|
|
: "+r" (res), "+r"(to), "+r"(from),
|
|
"=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4)
|
|
: "ir"(n)
|
|
: "lp_count", "memory");
|
|
}
|
|
if (orig_n / 8) {
|
|
orig_n = orig_n % 8;
|
|
|
|
__asm__ __volatile__(
|
|
"14: ld.ab %3, [%2,4] \n"
|
|
"15: ld.ab %4, [%2,4] \n"
|
|
" st.ab %3, [%1,4] \n"
|
|
" st.ab %4, [%1,4] \n"
|
|
" sub %0,%0,8 \n"
|
|
"31: ;nop \n"
|
|
" .section .fixup, \"ax\" \n"
|
|
" .align 4 \n"
|
|
"4: j 31b \n"
|
|
" .previous \n"
|
|
" .section __ex_table, \"a\" \n"
|
|
" .align 4 \n"
|
|
" .word 14b,4b \n"
|
|
" .word 15b,4b \n"
|
|
" .previous \n"
|
|
: "+r" (res), "+r"(to), "+r"(from),
|
|
"=r"(tmp1), "=r"(tmp2)
|
|
:
|
|
: "memory");
|
|
}
|
|
if (orig_n / 4) {
|
|
orig_n = orig_n % 4;
|
|
|
|
__asm__ __volatile__(
|
|
"16: ld.ab %3, [%2,4] \n"
|
|
" st.ab %3, [%1,4] \n"
|
|
" sub %0,%0,4 \n"
|
|
"32: ;nop \n"
|
|
" .section .fixup, \"ax\" \n"
|
|
" .align 4 \n"
|
|
"4: j 32b \n"
|
|
" .previous \n"
|
|
" .section __ex_table, \"a\" \n"
|
|
" .align 4 \n"
|
|
" .word 16b,4b \n"
|
|
" .previous \n"
|
|
: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
|
|
:
|
|
: "memory");
|
|
}
|
|
if (orig_n / 2) {
|
|
orig_n = orig_n % 2;
|
|
|
|
__asm__ __volatile__(
|
|
"17: ldw.ab %3, [%2,2] \n"
|
|
" stw.ab %3, [%1,2] \n"
|
|
" sub %0,%0,2 \n"
|
|
"33: ;nop \n"
|
|
" .section .fixup, \"ax\" \n"
|
|
" .align 4 \n"
|
|
"4: j 33b \n"
|
|
" .previous \n"
|
|
" .section __ex_table, \"a\" \n"
|
|
" .align 4 \n"
|
|
" .word 17b,4b \n"
|
|
" .previous \n"
|
|
: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
|
|
:
|
|
: "memory");
|
|
}
|
|
if (orig_n & 1) {
|
|
__asm__ __volatile__(
|
|
"18: ldb.ab %3, [%2,2] \n"
|
|
" stb.ab %3, [%1,2] \n"
|
|
" sub %0,%0,1 \n"
|
|
"34: ; nop \n"
|
|
" .section .fixup, \"ax\" \n"
|
|
" .align 4 \n"
|
|
"4: j 34b \n"
|
|
" .previous \n"
|
|
" .section __ex_table, \"a\" \n"
|
|
" .align 4 \n"
|
|
" .word 18b,4b \n"
|
|
" .previous \n"
|
|
: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
|
|
:
|
|
: "memory");
|
|
}
|
|
} else { /* n is NOT constant, so laddered copy of 16x,8,4,2,1 */
|
|
|
|
__asm__ __volatile__(
|
|
" mov %0,%3 \n"
|
|
" lsr.f lp_count, %3,4 \n" /* 16x bytes */
|
|
" lpnz 3f \n"
|
|
"1: ld.ab %5, [%2, 4] \n"
|
|
"11: ld.ab %6, [%2, 4] \n"
|
|
"12: ld.ab %7, [%2, 4] \n"
|
|
"13: ld.ab %8, [%2, 4] \n"
|
|
" st.ab %5, [%1, 4] \n"
|
|
" st.ab %6, [%1, 4] \n"
|
|
" st.ab %7, [%1, 4] \n"
|
|
" st.ab %8, [%1, 4] \n"
|
|
" sub %0,%0,16 \n"
|
|
"3: and.f %3,%3,0xf \n" /* stragglers */
|
|
" bz 34f \n"
|
|
" bbit0 %3,3,31f \n" /* 8 bytes left */
|
|
"14: ld.ab %5, [%2,4] \n"
|
|
"15: ld.ab %6, [%2,4] \n"
|
|
" st.ab %5, [%1,4] \n"
|
|
" st.ab %6, [%1,4] \n"
|
|
" sub.f %0,%0,8 \n"
|
|
"31: bbit0 %3,2,32f \n" /* 4 bytes left */
|
|
"16: ld.ab %5, [%2,4] \n"
|
|
" st.ab %5, [%1,4] \n"
|
|
" sub.f %0,%0,4 \n"
|
|
"32: bbit0 %3,1,33f \n" /* 2 bytes left */
|
|
"17: ldw.ab %5, [%2,2] \n"
|
|
" stw.ab %5, [%1,2] \n"
|
|
" sub.f %0,%0,2 \n"
|
|
"33: bbit0 %3,0,34f \n"
|
|
"18: ldb.ab %5, [%2,1] \n" /* 1 byte left */
|
|
" stb.ab %5, [%1,1] \n"
|
|
" sub.f %0,%0,1 \n"
|
|
"34: ;nop \n"
|
|
" .section .fixup, \"ax\" \n"
|
|
" .align 4 \n"
|
|
"4: j 34b \n"
|
|
" .previous \n"
|
|
" .section __ex_table, \"a\" \n"
|
|
" .align 4 \n"
|
|
" .word 1b, 4b \n"
|
|
" .word 11b,4b \n"
|
|
" .word 12b,4b \n"
|
|
" .word 13b,4b \n"
|
|
" .word 14b,4b \n"
|
|
" .word 15b,4b \n"
|
|
" .word 16b,4b \n"
|
|
" .word 17b,4b \n"
|
|
" .word 18b,4b \n"
|
|
" .previous \n"
|
|
: "=r" (res), "+r"(to), "+r"(from), "+r"(n), "=r"(val),
|
|
"=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4)
|
|
:
|
|
: "lp_count", "memory");
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static inline unsigned long
|
|
raw_copy_to_user(void __user *to, const void *from, unsigned long n)
|
|
{
|
|
long res = 0;
|
|
char val;
|
|
unsigned long tmp1, tmp2, tmp3, tmp4;
|
|
unsigned long orig_n = n;
|
|
|
|
if (n == 0)
|
|
return 0;
|
|
|
|
/* fallback for unaligned access when hardware doesn't support */
|
|
if (!IS_ENABLED(CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS) &&
|
|
(((unsigned long)to & 0x3) || ((unsigned long)from & 0x3))) {
|
|
|
|
unsigned char tmp;
|
|
|
|
__asm__ __volatile__(
|
|
" mov.f lp_count, %0 \n"
|
|
" lpnz 3f \n"
|
|
" ldb.ab %1, [%3, 1] \n"
|
|
"1: stb.ab %1, [%2, 1] \n"
|
|
" sub %0, %0, 1 \n"
|
|
"3: ;nop \n"
|
|
" .section .fixup, \"ax\" \n"
|
|
" .align 4 \n"
|
|
"4: j 3b \n"
|
|
" .previous \n"
|
|
" .section __ex_table, \"a\" \n"
|
|
" .align 4 \n"
|
|
" .word 1b, 4b \n"
|
|
" .previous \n"
|
|
|
|
: "+r" (n),
|
|
/* Note as an '&' earlyclobber operand to make sure the
|
|
* temporary register inside the loop is not the same as
|
|
* FROM or TO.
|
|
*/
|
|
"=&r" (tmp), "+r" (to), "+r" (from)
|
|
:
|
|
: "lp_count", "memory");
|
|
|
|
return n;
|
|
}
|
|
|
|
if (__builtin_constant_p(orig_n)) {
|
|
res = orig_n;
|
|
|
|
if (orig_n / 16) {
|
|
orig_n = orig_n % 16;
|
|
|
|
__asm__ __volatile__(
|
|
" lsr lp_count, %7,4 \n"
|
|
" lp 3f \n"
|
|
" ld.ab %3, [%2, 4] \n"
|
|
" ld.ab %4, [%2, 4] \n"
|
|
" ld.ab %5, [%2, 4] \n"
|
|
" ld.ab %6, [%2, 4] \n"
|
|
"1: st.ab %3, [%1, 4] \n"
|
|
"11: st.ab %4, [%1, 4] \n"
|
|
"12: st.ab %5, [%1, 4] \n"
|
|
"13: st.ab %6, [%1, 4] \n"
|
|
" sub %0, %0, 16 \n"
|
|
"3:;nop \n"
|
|
" .section .fixup, \"ax\" \n"
|
|
" .align 4 \n"
|
|
"4: j 3b \n"
|
|
" .previous \n"
|
|
" .section __ex_table, \"a\" \n"
|
|
" .align 4 \n"
|
|
" .word 1b, 4b \n"
|
|
" .word 11b,4b \n"
|
|
" .word 12b,4b \n"
|
|
" .word 13b,4b \n"
|
|
" .previous \n"
|
|
: "+r" (res), "+r"(to), "+r"(from),
|
|
"=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4)
|
|
: "ir"(n)
|
|
: "lp_count", "memory");
|
|
}
|
|
if (orig_n / 8) {
|
|
orig_n = orig_n % 8;
|
|
|
|
__asm__ __volatile__(
|
|
" ld.ab %3, [%2,4] \n"
|
|
" ld.ab %4, [%2,4] \n"
|
|
"14: st.ab %3, [%1,4] \n"
|
|
"15: st.ab %4, [%1,4] \n"
|
|
" sub %0, %0, 8 \n"
|
|
"31:;nop \n"
|
|
" .section .fixup, \"ax\" \n"
|
|
" .align 4 \n"
|
|
"4: j 31b \n"
|
|
" .previous \n"
|
|
" .section __ex_table, \"a\" \n"
|
|
" .align 4 \n"
|
|
" .word 14b,4b \n"
|
|
" .word 15b,4b \n"
|
|
" .previous \n"
|
|
: "+r" (res), "+r"(to), "+r"(from),
|
|
"=r"(tmp1), "=r"(tmp2)
|
|
:
|
|
: "memory");
|
|
}
|
|
if (orig_n / 4) {
|
|
orig_n = orig_n % 4;
|
|
|
|
__asm__ __volatile__(
|
|
" ld.ab %3, [%2,4] \n"
|
|
"16: st.ab %3, [%1,4] \n"
|
|
" sub %0, %0, 4 \n"
|
|
"32:;nop \n"
|
|
" .section .fixup, \"ax\" \n"
|
|
" .align 4 \n"
|
|
"4: j 32b \n"
|
|
" .previous \n"
|
|
" .section __ex_table, \"a\" \n"
|
|
" .align 4 \n"
|
|
" .word 16b,4b \n"
|
|
" .previous \n"
|
|
: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
|
|
:
|
|
: "memory");
|
|
}
|
|
if (orig_n / 2) {
|
|
orig_n = orig_n % 2;
|
|
|
|
__asm__ __volatile__(
|
|
" ldw.ab %3, [%2,2] \n"
|
|
"17: stw.ab %3, [%1,2] \n"
|
|
" sub %0, %0, 2 \n"
|
|
"33:;nop \n"
|
|
" .section .fixup, \"ax\" \n"
|
|
" .align 4 \n"
|
|
"4: j 33b \n"
|
|
" .previous \n"
|
|
" .section __ex_table, \"a\" \n"
|
|
" .align 4 \n"
|
|
" .word 17b,4b \n"
|
|
" .previous \n"
|
|
: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
|
|
:
|
|
: "memory");
|
|
}
|
|
if (orig_n & 1) {
|
|
__asm__ __volatile__(
|
|
" ldb.ab %3, [%2,1] \n"
|
|
"18: stb.ab %3, [%1,1] \n"
|
|
" sub %0, %0, 1 \n"
|
|
"34: ;nop \n"
|
|
" .section .fixup, \"ax\" \n"
|
|
" .align 4 \n"
|
|
"4: j 34b \n"
|
|
" .previous \n"
|
|
" .section __ex_table, \"a\" \n"
|
|
" .align 4 \n"
|
|
" .word 18b,4b \n"
|
|
" .previous \n"
|
|
: "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1)
|
|
:
|
|
: "memory");
|
|
}
|
|
} else { /* n is NOT constant, so laddered copy of 16x,8,4,2,1 */
|
|
|
|
__asm__ __volatile__(
|
|
" mov %0,%3 \n"
|
|
" lsr.f lp_count, %3,4 \n" /* 16x bytes */
|
|
" lpnz 3f \n"
|
|
" ld.ab %5, [%2, 4] \n"
|
|
" ld.ab %6, [%2, 4] \n"
|
|
" ld.ab %7, [%2, 4] \n"
|
|
" ld.ab %8, [%2, 4] \n"
|
|
"1: st.ab %5, [%1, 4] \n"
|
|
"11: st.ab %6, [%1, 4] \n"
|
|
"12: st.ab %7, [%1, 4] \n"
|
|
"13: st.ab %8, [%1, 4] \n"
|
|
" sub %0, %0, 16 \n"
|
|
"3: and.f %3,%3,0xf \n" /* stragglers */
|
|
" bz 34f \n"
|
|
" bbit0 %3,3,31f \n" /* 8 bytes left */
|
|
" ld.ab %5, [%2,4] \n"
|
|
" ld.ab %6, [%2,4] \n"
|
|
"14: st.ab %5, [%1,4] \n"
|
|
"15: st.ab %6, [%1,4] \n"
|
|
" sub.f %0, %0, 8 \n"
|
|
"31: bbit0 %3,2,32f \n" /* 4 bytes left */
|
|
" ld.ab %5, [%2,4] \n"
|
|
"16: st.ab %5, [%1,4] \n"
|
|
" sub.f %0, %0, 4 \n"
|
|
"32: bbit0 %3,1,33f \n" /* 2 bytes left */
|
|
" ldw.ab %5, [%2,2] \n"
|
|
"17: stw.ab %5, [%1,2] \n"
|
|
" sub.f %0, %0, 2 \n"
|
|
"33: bbit0 %3,0,34f \n"
|
|
" ldb.ab %5, [%2,1] \n" /* 1 byte left */
|
|
"18: stb.ab %5, [%1,1] \n"
|
|
" sub.f %0, %0, 1 \n"
|
|
"34: ;nop \n"
|
|
" .section .fixup, \"ax\" \n"
|
|
" .align 4 \n"
|
|
"4: j 34b \n"
|
|
" .previous \n"
|
|
" .section __ex_table, \"a\" \n"
|
|
" .align 4 \n"
|
|
" .word 1b, 4b \n"
|
|
" .word 11b,4b \n"
|
|
" .word 12b,4b \n"
|
|
" .word 13b,4b \n"
|
|
" .word 14b,4b \n"
|
|
" .word 15b,4b \n"
|
|
" .word 16b,4b \n"
|
|
" .word 17b,4b \n"
|
|
" .word 18b,4b \n"
|
|
" .previous \n"
|
|
: "=r" (res), "+r"(to), "+r"(from), "+r"(n), "=r"(val),
|
|
"=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4)
|
|
:
|
|
: "lp_count", "memory");
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static inline unsigned long __clear_user(void __user *to, unsigned long n)
|
|
{
|
|
long res = n;
|
|
unsigned char *d_char = to;
|
|
|
|
__asm__ __volatile__(
|
|
" bbit0 %0, 0, 1f \n"
|
|
"75: stb.ab %2, [%0,1] \n"
|
|
" sub %1, %1, 1 \n"
|
|
"1: bbit0 %0, 1, 2f \n"
|
|
"76: stw.ab %2, [%0,2] \n"
|
|
" sub %1, %1, 2 \n"
|
|
"2: asr.f lp_count, %1, 2 \n"
|
|
" lpnz 3f \n"
|
|
"77: st.ab %2, [%0,4] \n"
|
|
" sub %1, %1, 4 \n"
|
|
"3: bbit0 %1, 1, 4f \n"
|
|
"78: stw.ab %2, [%0,2] \n"
|
|
" sub %1, %1, 2 \n"
|
|
"4: bbit0 %1, 0, 5f \n"
|
|
"79: stb.ab %2, [%0,1] \n"
|
|
" sub %1, %1, 1 \n"
|
|
"5: \n"
|
|
" .section .fixup, \"ax\" \n"
|
|
" .align 4 \n"
|
|
"3: j 5b \n"
|
|
" .previous \n"
|
|
" .section __ex_table, \"a\" \n"
|
|
" .align 4 \n"
|
|
" .word 75b, 3b \n"
|
|
" .word 76b, 3b \n"
|
|
" .word 77b, 3b \n"
|
|
" .word 78b, 3b \n"
|
|
" .word 79b, 3b \n"
|
|
" .previous \n"
|
|
: "+r"(d_char), "+r"(res)
|
|
: "i"(0)
|
|
: "lp_count", "memory");
|
|
|
|
return res;
|
|
}
|
|
|
|
#define INLINE_COPY_TO_USER
|
|
#define INLINE_COPY_FROM_USER
|
|
|
|
#define __clear_user __clear_user
|
|
|
|
#include <asm-generic/uaccess.h>
|
|
|
|
#endif
|