02ffdc2796
git-svn-id: http://svn.lfbs.rwth-aachen.de/svn/scc/trunk/MetalSVM@235 315a16e6-25f9-4109-90ae-ca3045a26c18
122 lines
2.6 KiB
C
122 lines
2.6 KiB
C
/*
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* Copyright 2010 Stefan Lankes, Chair for Operating Systems,
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* RWTH Aachen University
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of MetalSVM.
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*/
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#ifndef __ARCH_STRING_H__
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#define __ARCH_STRING_H__
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#include <metalsvm/stddef.h>
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#include <asm/scc_memcpy.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef HAVE_ARCH_MEMCPY
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#if 0
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inline static void *memcpy(void *dest, const void *src, size_t count)
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{
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int32_t i, j, k;
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if (BUILTIN_EXPECT(!dest || !src, 0))
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return dest;
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asm volatile (
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"cld; rep ; movsl\n\t"
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"movl %4, %%ecx\n\t"
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"andl $3, %%ecx\n\t"
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"rep ; movsb\n\t"
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: "=&c"(i), "=&D"(j), "=&S"(k)
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: "0"(count/4), "g"(count), "1"(dest), "2"(src) : "memory");
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return dest;
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}
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#else
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inline static void *memcpy(void *dest, const void *src, size_t count)
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{
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int32_t h, i, j, k, l, m;
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if (BUILTIN_EXPECT(!dest || !src, 0))
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return dest;
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asm volatile (
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"cld;\n\t"
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"1: cmpl $0, %%eax ; je 2f\n\t"
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"movl (%%edi), %%edx\n\t"
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"movl $8, %%ecx\n\t"
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"rep ; movsl\n\t"
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"dec %%eax ; jmp 1b\n\t"
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"2: movl (%%edi), %%edx\n\t"
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"movl %%ebx, %%ecx\n\t"
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"andl $31, %%ecx\n\t"
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"rep ; movsb\n\t"
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: "=&a"(h), "=&D"(i), "=&S"(j), "=&b"(k), "=&c"(l), "=&d"(m)
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: "0"(count/32), "1"(dest), "2"(src), "3"(count) : "memory");
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return dest;
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}
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#endif
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#endif
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#ifdef HAVE_ARCH_MEMSET
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inline static void *memset(void *dest, int val, size_t count)
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{
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int32_t i, j;
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if (BUILTIN_EXPECT(!dest, 0))
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return dest;
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asm volatile ("cld; rep ; stosb"
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: "=&c"(i), "=&D"(j)
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: "a"(val), "1"(dest), "0"(count) : "memory");
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return dest;
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}
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#endif
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#ifdef HAVE_ARCH_STRLEN
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inline static size_t strlen(const char *str)
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{
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size_t len = 0;
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uint32_t i, j;
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if (BUILTIN_EXPECT(!str, 0))
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return len;
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asm volatile("not %%ecx; cld; repne ; scasb; not %%ecx; dec %%ecx"
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: "=&c"(len), "=&D"(i), "=&a"(j)
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: "2"(0), "1"(str), "0"(len)
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: "memory");
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return len;
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}
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#endif
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#ifdef HAVE_ARCH_STRNCPY
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char* strncpy(char *dest, const char *src, size_t n);
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#endif
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#ifdef HAVE_ARCH_STRCPY
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char* strcpy(char *dest, const char *src);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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