| /* |
| * 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) __overloadable |
| { |
| 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 |
| } |