xref: /openbsd-src/lib/csu/sh/md_init.h (revision 1e43641e997f17b3e752e4bc940b17070ff580a3)

/*	$OpenBSD: md_init.h,v 1.11 2023/11/18 16:26:16 deraadt Exp $	*/
/*	$NetBSD: dot_init.h,v 1.3 2005/12/24 22:02:10 perry Exp $	*/

/*-
 * Copyright (c) 2001 Ross Harvey
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the NetBSD
 *      Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#define MD_SECTION_PROLOGUE(sect, entry_pt)		    \
		__asm (					    \
		".section "#sect",\"ax\",@progbits	\n" \
		"	.globl " #entry_pt "		\n" \
		"	.type " #entry_pt ",@function	\n" \
		#entry_pt":				\n" \
		"	sts.l	pr, @-r15		\n" \
		"	.align	2			\n" \
		"	/* fall thru */			\n" \
		".previous")

#define MD_SECTION_EPILOGUE(sect)			    \
		__asm (					    \
		".section "#sect",\"ax\",@progbits	\n" \
		"	lds.l	@r15+, pr		\n" \
		"	rts				\n" \
		"	nop				\n" \
		".previous")

/*
 * We need to put the function pointer in our own constant
 * pool (otherwise it might be too far away to reference).
 */
#define MD_SECT_CALL_FUNC(section, func) \
__asm(".section " #section "\n"		\
"    mov.l 1f, r1	\n"		\
"    mova 2f, r0	\n"		\
"    braf r1		\n"		\
"     lds r0, pr	\n"		\
"0:  .p2align 2		\n"		\
"1:  .long " #func " - 0b \n"		\
"2:  .previous");


#if defined(__SH4__) && !defined(__SH4_NOFPU__)
#include <machine/fpu.h>

#define	MD_FPU_START				\
	void __set_fpscr(unsigned int);		\
	unsigned int __fpscr_values[2];

#define	MD_START_SETUP				\
	__set_fpscr(0);				\
	__fpscr_values[0] |= FPSCR_DN;		\
	__fpscr_values[1] |= FPSCR_DN;		\
	__asm volatile ("lds %0, fpscr"		\
	    : : "r" (__fpscr_values[1]));
#else
#define	MD_FPU_START
#endif /* defined(__SH4__) && !defined(__SH4_NOFPU__) */

#define	MD_CRT0_START							\
	MD_FPU_START							\
	__asm (".globl __start; __start = ___start")

#define	MD_RCRT0_START							\
	MD_FPU_START							\
	__asm (								\
	".text								\n" \
	"	.align	2						\n" \
	"	.globl	__start						\n" \
	"	.type	__start,@function				\n" \
	"__start:							\n" \
	"	mov	r15, r12					\n" \
	"	mov	r15, r4						\n" \
	"	add	#-72, r15					\n" \
	"	mov	r15, r5						\n" \
	"	bsr	1f						\n" \
	"	 nop							\n" \
	"1:								\n" \
	".L_offbase:							\n" \
	"	sts	pr, r0						\n" \
	"	mov.l	.L_dynamic, r6					\n" \
	"	add	r0, r6						\n" \
	"	mov.l	.L_boot_bind, r0				\n" \
	"	bsrf	r0						\n" \
	"	 nop							\n" \
	".L_call_boot_bind:						\n" \
	"	mov	r12, r15					\n" \
	"	mov.l	@r15, r4	/* argc */			\n" \
	"	mov	r15, r5						\n" \
	"	add	#4, r5		/* argv */			\n" \
	"	mov	r4, r6						\n" \
	"	add	#1, r6						\n" \
	"	shll2	r6						\n" \
	"	add	r5, r6		/* envp */			\n" \
	"	bra	___start					\n" \
	"	 mov	#0, r7		/* cleanup */			\n" \
	"	.align	2						\n" \
	".L_boot_bind:							\n" \
	"	.long	_dl_boot_bind - .L_call_boot_bind		\n" \
	".L_datasize:							\n" \
	"	.long	4 + 4 + (16 * 4)				\n" \
	".L_dynamic:							\n" \
	"	.long	_DYNAMIC - .L_offbase				\n" \
									\
	"	.align	2						\n" \
	"	.globl	_csu_abort					\n" \
	"	.type	_csu_abort,@function				\n" \
	"_csu_abort:							\n" \
	"	sleep	/* illegal */					\n" \
	".previous")