xref: /src/lib/libc/arch/sh3/gen/setjmp.S

/*	$NetBSD: setjmp.S,v 1.12 2024/07/17 07:11:57 uwe Exp $	*/

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * 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 University 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 REGENTS 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 REGENTS 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.
 *
 *	from: @(#)setjmp.s	5.1 (Berkeley) 4/23/90
 */

#include <machine/asm.h>
#include <machine/setjmp.h>

#if defined(LIBC_SCCS)
	RCSID("$NetBSD: setjmp.S,v 1.12 2024/07/17 07:11:57 uwe Exp $")
#endif

/*
 * C library -- setjmp, longjmp
 *
 *	longjmp(a,v)
 * will generate a "return(v)" from the last call to
 *	setjmp(a)
 * by restoring registers from the stack.
 * The previous signal state is restored.
 */

ENTRY(__setjmp14)
	PIC_PROLOGUE(.L_got_1)
	sts.l	pr, @-sp
	mov.l	r4, @-sp

	mov.l	.L___sigprocmask14_1, r0
	mov	r4, r6
	mov	#0, r4			/* how is ignored */
	mov	#0, r5			/* set = NULL */
1:	CALL	r0
	 add	#(_JB_SIGMASK * 4), r6	/* oset = &sigmask */

	mov.l	@sp+, r4
	lds.l	@sp+, pr
	PIC_EPILOGUE

	/* identical to _setjmp except that _JB_HAS_MASK is non-zero */
	add	#((_JB_HAS_MASK + 1) * 4), r4
	mov	#1, r0
	mov.l	r0, @-r4		/* has signal mask */
	mov.l	r15, @-r4
	mov.l	r14, @-r4
	mov.l	r13, @-r4
	mov.l	r12, @-r4
	mov.l	r11, @-r4
	mov.l	r10, @-r4
	mov.l	r9, @-r4
	mov.l	r8, @-r4
	sts.l	pr, @-r4
	rts
	 xor	r0, r0

	.align	2
.L_got_1:		PIC_GOT_DATUM
.L___sigprocmask14_1:	CALL_DATUM(_C_LABEL(__sigprocmask14), 1b)
	SET_ENTRY_SIZE(__setjmp14)


ENTRY(__longjmp14)
	// return value can't be zero, adjust to 1 if it is
	tst	r5, r5
	bf/s	0f
	 mov.l	@(_JB_REG_PR * 4, r4), r0
	mov	#1, r5
0:
	// restore context first (callee-saved regs)
	mov.l	@(_JB_REG_R8  * 4, r4), r8
	mov.l	@(_JB_REG_R9  * 4, r4), r9
	mov.l	@(_JB_REG_R10 * 4, r4), r10
	mov.l	@(_JB_REG_R11 * 4, r4), r11
	mov.l	@(_JB_REG_R12 * 4, r4), r12
	mov.l	@(_JB_REG_R13 * 4, r4), r13
	mov.l	@(_JB_REG_R14 * 4, r4), r14
	mov.l	@(_JB_REG_R15 * 4, r4), r15

	// create a frame
	mov.l	r5, @-sp	// future return value (pre-adjusted)
	mov.l	r0, @-sp	// caller's PR from the jumpbuf
	PIC_PROLOGUE(.L_got_2)

	// restore signal mask from &a[_JB_SIGMASK]
	mov	#0, r6			// oset = NULL
	mov	r4, r5
	mov.l	.L___sigprocmask14_2, r0
	add	#(_JB_SIGMASK * 4), r5	// set = &a[_JB_SIGMASK]
1:	CALL	r0
	 mov	#3, r4			// how = SIG_SETMASK

	// return "from" setjmp
	PIC_EPILOGUE
	lds.l	@sp+, pr
	rts
	 mov.l	@sp+, r0

	.align	2
.L_got_2:		PIC_GOT_DATUM
.L___sigprocmask14_2:	CALL_DATUM(_C_LABEL(__sigprocmask14), 1b)
	SET_ENTRY_SIZE(__longjmp14)