1/* 2 * Copyright (C) 2014 Andrew Turner 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28#include <machine/asm.h> 29#define PCR_Z (1 << 30) 30#define PCR_C (1 << 29) 31 32/* 33 * These functions return the result in the CPSR register. 34 * 35 * For __aeabi_cdcmple: 36 * Z C 37 * LT 0 0 38 * EQ 1 1 39 * else 0 1 40 * 41 * __aeabi_cdrcmple is the same as __aeabi_cdcmple, however the arguments 42 * have been swapped. 43 */ 44ENTRY(__aeabi_cdcmple) 45 push {r4, r5, r6, r7, ip, lr} 46 47 /* Backup the input registers */ 48 mov r4, r0 49 mov r5, r1 50 mov r6, r2 51 mov r7, r3 52 /* Is it less than? */ 53 bl __aeabi_dcmplt 54 cmp r0, #1 55 bne 1f 56 /* Yes, clear Z and C */ 57 mov ip, #(0) 58 b 99f 59 601: 61 /* Restore the input regsters for the next function call */ 62 mov r0, r4 63 mov r1, r5 64 mov r2, r6 65 mov r3, r7 66 /* Is it equal? */ 67 bl __aeabi_dcmpeq 68 cmp r0, #1 69 bne 2f 70 /* Yes, set Z and C */ 71 mov ip, #(PCR_Z | PCR_C) 72 b 99f 73 742: 75 /* Not less than or equal, set C and clear Z */ 76 mov ip, #(PCR_C) 77 7899: 79 msr cpsr_c, ip 80 pop {r4, r5, r6, r7, ip, pc} 81END(__aeabi_cdcmple) 82 83ENTRY(__aeabi_cdrcmple) 84 /* Swap the first half of the arguments */ 85 mov ip, r0 86 mov r0, r2 87 mov r2, ip 88 89 /* And the second half */ 90 mov ip, r1 91 mov r1, r3 92 mov r3, ip 93 94 b __aeabi_cdcmple 95END(__aeabi_cdrcmple) 96 97/* 98 * This is just like __aeabi_cdcmple except it will not throw an exception 99 * in the presence of a quiet NaN. If either argument is a signalling NaN we 100 * will still signal. 101 */ 102ENTRY(__aeabi_cdcmpeq) 103 /* Check if we can call __aeabi_cfcmple safely */ 104 push {r0, r1, r2, r3, r4, lr} 105 bl __aeabi_cdcmpeq_helper 106 cmp r0, #1 107 pop {r0, r1, r2, r3, r4, lr} 108 beq 1f 109 110 bl __aeabi_cdcmple 111 RET 112 1131: 114 mov ip, #(PCR_C) 115 msr cpsr_c, ip 116 RET 117END(__aeabi_cdcmpeq) 118 119 .section .note.GNU-stack,"",%progbits 120