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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/lib/libc/powerpc/gen/_ctx_start.S
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/*

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 * Copyright (c) 2004 Suleiman Souhlal

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 * All rights reserved.

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 *

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 * Redistribution and use in source and binary forms, with or without

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 * modification, are permitted provided that the following conditions

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 * are met:

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 * 1. Redistributions of source code must retain the above copyright

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 *    notice, this list of conditions and the following disclaimer.

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 * 2. Redistributions in binary form must reproduce the above copyright

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 *    notice, this list of conditions and the following disclaimer in the

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 *    documentation and/or other materials provided with the distribution.

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 *

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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

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 * SUCH DAMAGE.

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 */

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 #include <machine/asm.h>

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	.globl  CNAME(_ctx_done)

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	.globl  CNAME(abort)

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 ENTRY(_ctx_start)

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	mtlr	%r14

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	blrl			/* branch to start function */

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	mr	%r3,%r15	/* pass pointer to ucontext as argument */

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	bl	CNAME(_ctx_done) /* branch to ctxt completion func */

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	/*

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	 * we should never return from the

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	 * above branch.

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	 */

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	/* Don't bother saving off %r30, we're already in a bad state. */

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	bcl	20,31,1f

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1:	mflr	%r30

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	mr	%r3,%r30		# save for _DYNAMIC

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	addis	%r30,%r30,_GLOBAL_OFFSET_TABLE_-1b@ha

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	addi	%r30,%r30,_GLOBAL_OFFSET_TABLE_-1b@l

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	bl	PIC_PLT(CNAME(abort))	/* abort */

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 END(_ctx_start)

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

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