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/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright © 2019 Keith Packard
*
* 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.
*
* 3. Neither the name of the copyright holder 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 HOLDER 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 "../../crt0.h"
static void __used __section(".text.startup")
_cstart(void)
{
__start();
}
extern char __stack[];
#define FPSCR_FR (1 << 21)
#define FPSCR_SZ (1 << 20)
#define FPSCR_PR (1 << 19)
#define FPSCR_DN (1 << 18)
#define FPSCR_RN (0 << 0)
#define FPSCR_RM (3 << 0)
void __section(".init") __used
_start(void)
{
/* Set up the stack pointer */
__asm__("mov %0, r15" : : "r" (__stack));
/* Initialize the FPU */
#ifdef __SH_FPU_ANY__
long fpscr;
__asm__("sts fpscr,%0" : "=r" (fpscr));
/* enable denorms */
fpscr &= ~FPSCR_DN;
/* set round to nearest */
fpscr &= ~FPSCR_RM;
fpscr |= FPSCR_RN;
#if defined(__SH_FPU_DOUBLE__) && !defined(__SH2A_SINGLE__) && !defined(__SH4_SINGLE__)
fpscr |= FPSCR_PR;
#else
fpscr &= ~FPSCR_PR;
#endif
__asm__("lds %0,fpscr" : : "r" (fpscr));
#endif
/* Branch to C code */
__asm__("jmp @%0" : : "r" (_cstart));
/* Fill in any delay slot */
__asm__("nop");
}
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