/*
|
* Copyright (c) 2017 Imagination Technologies.
|
*
|
* All rights reserved.
|
*
|
* Redistribution and use in source and binary forms, with or without
|
* modification, are permitted provided that the following conditions
|
* are met:
|
*
|
* * Redistributions of source code must retain the above copyright
|
* notice, this list of conditions and the following disclaimer.
|
* * Redistributions in binary form must reproduce the above copyright
|
* notice, this list of conditions and the following disclaimer
|
* in the documentation and/or other materials provided with
|
* the distribution.
|
* * Neither the name of Imagination Technologies nor the names of its
|
* contributors may be used to endorse or promote products derived
|
* from this software without specific prior written permission.
|
*
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
*/
|
|
#include <string.h>
|
|
#if !defined(UNALIGNED_INSTR_SUPPORT)
|
/* does target have unaligned lw/ld/ualw/uald instructions? */
|
#define UNALIGNED_INSTR_SUPPORT 0
|
#if __mips_isa_rev < 6 && !__mips1
|
#undef UNALIGNED_INSTR_SUPPORT
|
#define UNALIGNED_INSTR_SUPPORT 1
|
#endif
|
#endif
|
|
#if !defined(HW_UNALIGNED_SUPPORT)
|
/* Does target have hardware support for unaligned accesses? */
|
#define HW_UNALIGNED_SUPPORT 0
|
#if __mips_isa_rev >= 6
|
#undef HW_UNALIGNED_SUPPORT
|
#define HW_UNALIGNED_SUPPORT 1
|
#endif
|
#endif
|
|
#define ENABLE_PREFETCH 1
|
|
#if ENABLE_PREFETCH
|
#define PREFETCH(addr) __builtin_prefetch (addr, 0, 1);
|
#else
|
#define PREFETCH(addr)
|
#endif
|
|
#if _MIPS_SIM == _ABIO32
|
typedef unsigned long reg_t;
|
typedef struct
|
{
|
reg_t B0:8, B1:8, B2:8, B3:8;
|
} bits_t;
|
#else
|
typedef unsigned long long reg_t;
|
typedef struct
|
{
|
reg_t B0:8, B1:8, B2:8, B3:8, B4:8, B5:8, B6:8, B7:8;
|
} bits_t;
|
#endif
|
|
typedef union
|
{
|
reg_t v;
|
bits_t b;
|
} bitfields_t;
|
|
#define DO_BYTE(a, i) \
|
a[i] = bw.b.B##i; \
|
len--; \
|
if(!len) return ret; \
|
|
/* This code is called when aligning a pointer, there are remaining bytes
|
after doing word compares, or architecture does not have some form
|
of unaligned support. */
|
static inline void * __attribute__ ((always_inline))
|
do_bytes (void *a, const void *b, unsigned long len, void *ret)
|
{
|
unsigned char *x = (unsigned char *) a;
|
unsigned char *y = (unsigned char *) b;
|
unsigned long i;
|
|
/* 'len' might be zero here, so preloading the first two values
|
before the loop may access unallocated memory. */
|
for (i = 0; i < len; i++) {
|
*x = *y;
|
x++;
|
y++;
|
}
|
return ret;
|
}
|
|
/* This code is called to copy only remaining bytes within word or doubleword */
|
static inline void * __attribute__ ((always_inline))
|
do_bytes_remaining (void *a, const void *b, unsigned long len, void *ret)
|
{
|
unsigned char *x = (unsigned char *) a;
|
|
if(len > 0) {
|
bitfields_t bw;
|
bw.v = *((reg_t*) b);
|
|
#if __mips64
|
DO_BYTE(x, 0);
|
DO_BYTE(x, 1);
|
DO_BYTE(x, 2);
|
DO_BYTE(x, 3);
|
DO_BYTE(x, 4);
|
DO_BYTE(x, 5);
|
DO_BYTE(x, 6);
|
DO_BYTE(x, 7);
|
#else
|
DO_BYTE(x, 0);
|
DO_BYTE(x, 1);
|
DO_BYTE(x, 2);
|
DO_BYTE(x, 3);
|
#endif
|
}
|
|
return ret;
|
}
|
|
#if !HW_UNALIGNED_SUPPORT
|
#if UNALIGNED_INSTR_SUPPORT
|
/* for MIPS GCC, there are no unaligned builtins - so this struct forces
|
the compiler to treat the pointer access as unaligned. */
|
struct ulw
|
{
|
reg_t uli;
|
} __attribute__ ((packed));
|
|
/* first pointer is not aligned while second pointer is. */
|
static void *
|
unaligned_words (struct ulw *a, const reg_t * b,
|
unsigned long words, unsigned long bytes, void *ret)
|
{
|
#if ((_MIPS_SIM == _ABIO32) || _MIPS_TUNE_I6400)
|
unsigned long i, words_by_8, words_by_1;
|
words_by_1 = words % 8;
|
words_by_8 = words >> 3;
|
for (; words_by_8 > 0; words_by_8--) {
|
if(words_by_8 != 1)
|
PREFETCH (b + 8);
|
reg_t y0 = b[0], y1 = b[1], y2 = b[2], y3 = b[3];
|
reg_t y4 = b[4], y5 = b[5], y6 = b[6], y7 = b[7];
|
a[0].uli = y0;
|
a[1].uli = y1;
|
a[2].uli = y2;
|
a[3].uli = y3;
|
a[4].uli = y4;
|
a[5].uli = y5;
|
a[6].uli = y6;
|
a[7].uli = y7;
|
a += 8;
|
b += 8;
|
}
|
#else
|
unsigned long i, words_by_4, words_by_1;
|
words_by_1 = words % 4;
|
words_by_4 = words >> 2;
|
for (; words_by_4 > 0; words_by_4--) {
|
if(words_by_4 != 1)
|
PREFETCH (b + 4);
|
reg_t y0 = b[0], y1 = b[1], y2 = b[2], y3 = b[3];
|
a[0].uli = y0;
|
a[1].uli = y1;
|
a[2].uli = y2;
|
a[3].uli = y3;
|
a += 4;
|
b += 4;
|
}
|
#endif
|
|
/* do remaining words. */
|
for (i = 0; i < words_by_1; i++) {
|
a->uli = *b;
|
a += 1;
|
b += 1;
|
}
|
|
/* mop up any remaining bytes. */
|
return do_bytes_remaining (a, b, bytes, ret);
|
}
|
#else
|
/* no HW support or unaligned lw/ld/ualw/uald instructions. */
|
static void *
|
unaligned_words (reg_t * a, const reg_t * b,
|
unsigned long words, unsigned long bytes, void *ret)
|
{
|
unsigned long i;
|
unsigned char *x = (unsigned char *) a;
|
|
for (i = 0; i < words; i++) {
|
bitfields_t bw;
|
bw.v = *((reg_t*) b);
|
x = (unsigned char *) a;
|
#if __mips64
|
x[0] = bw.b.B0;
|
x[1] = bw.b.B1;
|
x[2] = bw.b.B2;
|
x[3] = bw.b.B3;
|
x[4] = bw.b.B4;
|
x[5] = bw.b.B5;
|
x[6] = bw.b.B6;
|
x[7] = bw.b.B7;
|
#else
|
x[0] = bw.b.B0;
|
x[1] = bw.b.B1;
|
x[2] = bw.b.B2;
|
x[3] = bw.b.B3;
|
#endif
|
a += 1;
|
b += 1;
|
}
|
|
/* mop up any remaining bytes */
|
return do_bytes_remaining (a, b, bytes, ret);
|
}
|
#endif /* UNALIGNED_INSTR_SUPPORT */
|
#endif /* HW_UNALIGNED_SUPPORT */
|
|
/* both pointers are aligned, or first isn't and HW support for unaligned. */
|
static void *
|
aligned_words (reg_t * a, const reg_t * b,
|
unsigned long words, unsigned long bytes, void *ret)
|
{
|
#if ((_MIPS_SIM == _ABIO32) || _MIPS_TUNE_I6400)
|
unsigned long i, words_by_8, words_by_1;
|
words_by_1 = words % 8;
|
words_by_8 = words >> 3;
|
for (; words_by_8 > 0; words_by_8--) {
|
if(words_by_8 != 1)
|
PREFETCH (b + 8);
|
reg_t x0 = b[0], x1 = b[1], x2 = b[2], x3 = b[3];
|
reg_t x4 = b[4], x5 = b[5], x6 = b[6], x7 = b[7];
|
a[0] = x0;
|
a[1] = x1;
|
a[2] = x2;
|
a[3] = x3;
|
a[4] = x4;
|
a[5] = x5;
|
a[6] = x6;
|
a[7] = x7;
|
a += 8;
|
b += 8;
|
}
|
#else
|
unsigned long i, words_by_4, words_by_1;
|
words_by_1 = words % 4;
|
words_by_4 = words >> 2;
|
for (; words_by_4 > 0; words_by_4--) {
|
if(words_by_4 != 1)
|
PREFETCH (b + 4);
|
reg_t x0 = b[0], x1 = b[1], x2 = b[2], x3 = b[3];
|
a[0] = x0;
|
a[1] = x1;
|
a[2] = x2;
|
a[3] = x3;
|
a += 4;
|
b += 4;
|
}
|
#endif
|
|
/* do remaining words. */
|
for (i = 0; i < words_by_1; i++) {
|
*a = *b;
|
a += 1;
|
b += 1;
|
}
|
|
/* mop up any remaining bytes. */
|
return do_bytes_remaining (a, b, bytes, ret);
|
}
|
|
void *
|
memcpy (void *a, const void *b, size_t len)
|
{
|
unsigned long bytes, words;
|
void *ret = a;
|
|
/* shouldn't hit that often. */
|
if (len < sizeof (reg_t) * 4) {
|
return do_bytes (a, b, len, a);
|
}
|
|
/* Align the second pointer to word/dword alignment.
|
Note that the pointer is only 32-bits for o32/n32 ABIs. For
|
n32, loads are done as 64-bit while address remains 32-bit. */
|
bytes = ((unsigned long) b) % sizeof (reg_t);
|
if (bytes) {
|
bytes = sizeof (reg_t) - bytes;
|
if (bytes > len)
|
bytes = len;
|
do_bytes (a, b, bytes, ret);
|
if (len == bytes)
|
return ret;
|
len -= bytes;
|
a = (void *) (((unsigned char *) a) + bytes);
|
b = (const void *) (((unsigned char *) b) + bytes);
|
}
|
|
/* Second pointer now aligned. */
|
words = len / sizeof (reg_t);
|
bytes = len % sizeof (reg_t);
|
#if HW_UNALIGNED_SUPPORT
|
/* treat possible unaligned first pointer as aligned. */
|
return aligned_words (a, b, words, bytes, ret);
|
#else
|
if (((unsigned long) a) % sizeof (reg_t) == 0) {
|
return aligned_words (a, b, words, bytes, ret);
|
}
|
/* need to use unaligned instructions on first pointer. */
|
return unaligned_words (a, b, words, bytes, ret);
|
#endif
|
}
|
