/*
 * Copyright (C) 2014 Andrew Turner
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <machine/asm.h>
#define PCR_Z   (1 << 30)
#define PCR_C   (1 << 29)

/*
 * These functions return the result in the CPSR register.
 *
 * For __aeabi_cfcmple:
 *      Z C
 *   LT 0 0
 *   EQ 1 1
 * else 0 1
 *
 * __aeabi_cfrcmple is the same as __aeabi_cfcmple, however the arguments
 * have been swapped.
 */
ENTRY(__aeabi_cfcmple)
        push    {r4, r5, ip, lr}

        /* Backup the input registers */
        mov     r4, r0
        mov     r5, r1
        /* Is it less than? */
        bl      __aeabi_fcmplt
        cmp     r0, #1
        bne     1f
        /* Yes, clear Z and C */
        mov     ip, #(0)
        b       99f

1:
        /* Restore the input regsters for the next function call */
        mov     r0, r4
        mov     r1, r5
        /* Is it equal? */
        bl      __aeabi_fcmpeq
        cmp     r0, #1
        bne     2f
        /* Yes, set Z and C */
        mov     ip, #(PCR_Z | PCR_C)
        b 99f

2:
        /* Not less than or equal, set C and clear Z */
        mov     ip, #(PCR_C)

99:
        msr     cpsr_c, ip
        pop     {r4, r5, ip, pc}
END(__aeabi_cfcmple)

ENTRY(__aeabi_cfrcmple)
        /* Swap the arguments */
        mov     ip, r0
        mov     r0, r1
        mov     r1, ip

        b       __aeabi_cfcmple
END(__aeabi_cfrcmple)

/*
 * This is just like __aeabi_cfcmple except it will not throw an exception
 * in the presence of a quiet NaN. If either argument is a signalling NaN we
 * will still signal.
 */
ENTRY(__aeabi_cfcmpeq)
        /* Check if we can call __aeabi_cfcmple safely */
        push    {r0, r1, r2, lr}
        bl      __aeabi_cfcmpeq_helper
        cmp     r0, #1
        pop     {r0, r1, r2, lr}
        beq     1f

        bl      __aeabi_cfcmple
        RET

1:
        mov     ip, #(PCR_C)
        msr     cpsr_c, ip
        RET
END(__aeabi_cfcmpeq)

        .section .note.GNU-stack,"",%progbits