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/* Special support for trampolines
*
* Copyright (C) 1996, 1997, 2000, 2007, 2008 Free Software Foundation, Inc.
* Written By Michael Meissner
*
* This file is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* In addition to the permissions in the GNU General Public License, the
* Free Software Foundation gives you unlimited permission to link the
* compiled version of this file with other programs, and to distribute
* those programs without any restriction coming from the use of this
* file. (The General Public License restrictions do apply in other
* respects; for example, they cover modification of the file, and
* distribution when not linked into another program.)
*
* This file is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* As a special exception, if you link this library with files
* compiled with GCC to produce an executable, this does not cause
* the resulting executable to be covered by the GNU General Public License.
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*/
/* Set up trampolines. */
.section ".text"
#include "ppc-asm.h"
#include "config.h"
#ifndef __powerpc64__
.type trampoline_initial,@object
.align 2
trampoline_initial:
mflr r0
bcl 20,31,1f
.Lfunc = .-trampoline_initial
.long 0 /* will be replaced with function address */
.Lchain = .-trampoline_initial
.long 0 /* will be replaced with static chain */
1: mflr r11
mtlr r0
lwz r0,0(r11) /* function address */
lwz r11,4(r11) /* static chain */
mtctr r0
bctr
trampoline_size = .-trampoline_initial
.size trampoline_initial,trampoline_size
/* R3 = stack address to store trampoline */
/* R4 = length of trampoline area */
/* R5 = function address */
/* R6 = static chain */
FUNC_START(__trampoline_setup)
mflr r0 /* save return address */
bcl 20,31,.LCF0 /* load up __trampoline_initial into r7 */
.LCF0:
mflr r11
addi r7,r11,trampoline_initial-4-.LCF0 /* trampoline address -4 */
li r8,trampoline_size /* verify that the trampoline is big enough */
cmpw cr1,r8,r4
srwi r4,r4,2 /* # words to move */
addi r9,r3,-4 /* adjust pointer for lwzu */
mtctr r4
blt cr1,.Labort
mtlr r0
/* Copy the instructions to the stack */
.Lmove:
lwzu r10,4(r7)
stwu r10,4(r9)
bdnz .Lmove
/* Store correct function and static chain */
stw r5,.Lfunc(r3)
stw r6,.Lchain(r3)
/* Now flush both caches */
mtctr r4
.Lcache:
icbi 0,r3
dcbf 0,r3
addi r3,r3,4
bdnz .Lcache
/* Finally synchronize things & return */
sync
isync
blr
.Labort:
#if (defined __PIC__ || defined __pic__) && defined HAVE_AS_REL16
bcl 20,31,1f
1: mflr r30
addis r30,r30,_GLOBAL_OFFSET_TABLE_-1b@ha
addi r30,r30,_GLOBAL_OFFSET_TABLE_-1b@l
#endif
bl JUMP_TARGET(abort)
FUNC_END(__trampoline_setup)
#endif
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