1d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand/* Copyright (C) 2002, 2003 Free Software Foundation, Inc. 2d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand This file is part of the GNU C Library. 3d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand Contributed by Hartvig Ekner <hartvige@mips.com>, 2002. 4d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 5d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand The GNU C Library is free software; you can redistribute it and/or 6d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand modify it under the terms of the GNU Lesser General Public 7d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand License as published by the Free Software Foundation; either 8d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand version 2.1 of the License, or (at your option) any later version. 9d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 10d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand The GNU C Library is distributed in the hope that it will be useful, 11d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand but WITHOUT ANY WARRANTY; without even the implied warranty of 12d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand Lesser General Public License for more details. 14d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 15d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand You should have received a copy of the GNU Lesser General Public 16d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand License along with the GNU C Library; if not, write to the Free 17d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 02111-1307 USA. */ 19d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 20d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand/* void *memset_omips(void *s, int c, size_t n). */ 21d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 22d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand#include "machine/asm.h" 23d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 24d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand#ifdef __mips64 25d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand#error mips32 code being compiled for mips64! 26d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand#endif 27d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 28d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand#if defined(__MIPSEB__) 29d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand#error big-endian is not supported in Broadcom MIPS Android platform 30d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand# define SWHI swl /* high part is left in big-endian */ 31d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand#else 32d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand# define SWHI swr /* high part is right in little-endian */ 33d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand#endif 34d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 35d4a80984fcf1066e244a8909354df03ba1e3f786Duane SandLEAF (memset_omips,0) 36d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand .set noreorder 37d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 38d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand slti t1, a2, 8 # Less than 8? 39d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand bne t1, zero, .Llast8 40d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand move v0, a0 # Setup exit value before too late 41d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 42d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand beq a1, zero, .Lueven # If zero pattern, no need to extend 43d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand andi a1, 0xff # Avoid problems with bogus arguments 44d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand sll t0, a1, 8 45d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand or a1, t0 46d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand sll t0, a1, 16 47d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand or a1, t0 # a1 is now pattern in full word 48d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 49d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand.Lueven: 50d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand subu t0, zero, a0 # Unaligned address? 51d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand andi t0, 0x3 52d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand beq t0, zero, .Lchkw 53d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand subu a2, t0 54d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand SWHI a1, 0(a0) # Yes, handle first unaligned part 55d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand addu a0, t0 # Now both a0 and a2 are updated 56d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 57d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand.Lchkw: 58d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand andi t0, a2, 0x7 # Enough left for one loop iteration? 59d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand beq t0, a2, .Lchkl 60d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand subu a3, a2, t0 61d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand addu a3, a0 # a3 is last loop address +1 62d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand move a2, t0 # a2 is now # of bytes left after loop 63d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand.Lloopw: 64d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand addiu a0, 8 # Handle 2 words pr. iteration 65d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand sw a1, -8(a0) 66d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand bne a0, a3, .Lloopw 67d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand sw a1, -4(a0) 68d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 69d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand.Lchkl: 70d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand andi t0, a2, 0x4 # Check if there is at least a full 71d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand beq t0, zero, .Llast8 # word remaining after the loop 72d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand subu a2, t0 73d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand sw a1, 0(a0) # Yes... 74d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand addiu a0, 4 75d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 76d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand.Llast8: 77d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand blez a2, .Lexit # Handle last 8 bytes (if cnt>0) 78d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand addu a3, a2, a0 # a3 is last address +1 79d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand.Llst8l: 80d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand addiu a0, 1 81d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand bne a0, a3, .Llst8l 82d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand sb a1, -1(a0) 83d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand.Lexit: 84d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand j ra # Bye, bye 85d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand nop 86d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 87d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand .set reorder 88d4a80984fcf1066e244a8909354df03ba1e3f786Duane SandEND (memset_omips) 89d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 90d4a80984fcf1066e244a8909354df03ba1e3f786Duane Sand 91