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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/lib/libc/powerpc64/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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#if !defined(_CALL_ELF) || _CALL_ELF == 1

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	/* Load values from function descriptor */

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	ld	%r2,8(%r14)

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	ld	%r14,0(%r14)

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#else

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	/*

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	 * The stack frame was already set up in makecontext(),

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	 * so we can safely use the guaranteed fields here.

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	 *

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	 * Note we do step on the allocated stack frame's TOC,

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	 * but since we never return from this function (i.e.

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	 * never restore the stack frame) this should be safe.

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	 */

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	std	%r2,24(%r1)	/* save TOC */

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	/* Load global entry point */

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	mr	%r12,%r14

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#endif

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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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	nop

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#if defined(_CALL_ELF) && _CALL_ELF != 1

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	/* Restore TOC */

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	ld	%r2,24(%r1)

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#endif

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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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	nop

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	bl	CNAME(abort)	/* abort */

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	nop

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 END(_ctx_start)

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

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