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__FBSDID("$FreeBSD$"); 30 31#define PCR_Z (1 << 30) 32#define PCR_C (1 << 29) 33 34/* 35 * These functions return the result in the CPSR register. 36 * 37 * For __aeabi_cfcmple: 38 * Z C 39 * LT 0 0 40 * EQ 1 1 41 * else 0 1 42 * 43 * __aeabi_cfrcmple is the same as __aeabi_cfcmple, however the arguments 44 * have been swapped. 45 */ 46ENTRY(__aeabi_cfcmple) 47 push {r4, r5, ip, lr} 48 49 /* Backup the input registers */ 50 mov r4, r0 51 mov r5, r1 52 /* Is it less than? */ 53 bl __aeabi_fcmplt 54 cmp r0, #1 55 bne 1f 56 /* Yes, clear Z and C */ 57 msr cpsr_c, #(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 /* Is it equal? */ 65 bl __aeabi_fcmpeq 66 cmp r0, #1 67 bne 2f 68 /* Yes, set Z and C */ 69 msr cpsr_c, #(PCR_Z | PCR_C) 70 b 99f 71 722: 73 /* Not less than or equal, set C and clear Z */ 74 msr cpsr_c, #(PCR_C) 75 7699: 77 pop {r4, r5, ip, pc} 78END(__aeabi_cfcmple) 79 80ENTRY(__aeabi_cfrcmple) 81 /* Swap the arguments */ 82 mov ip, r0 83 mov r0, r1 84 mov r1, ip 85 86 b __aeabi_cfcmple 87END(__aeabi_cfrcmple) 88 89/* 90 * This is just like __aeabi_cfcmple except it will not throw an exception 91 * in the presence of a quiet NaN. If either argument is a signalling NaN we 92 * will still signal. 93 */ 94ENTRY(__aeabi_cfcmpeq) 95 /* Check if we can call __aeabi_cfcmple safely */ 96 push {r0, r1, r2, lr} 97 bl __aeabi_cfcmpeq_helper 98 cmp r0, #1 99 pop {r0, r1, r2, lr} 100 beq 1f 101 102 bl __aeabi_cfcmple 103 RET 104 1051: 106 msreq cpsr_c, #(PCR_C) 107 RET 108END(__aeabi_cfcmpeq) 109