2012-03-27 23:13:14 +00:00
|
|
|
/* Special support for trampolines
|
|
|
|
|
*
|
2017-10-07 00:16:47 +00:00
|
|
|
* Copyright (C) 1996-2017 Free Software Foundation, Inc.
|
2012-03-27 23:13:14 +00:00
|
|
|
* 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 3, or (at your option) any
|
|
|
|
|
* later version.
|
|
|
|
|
*
|
|
|
|
|
* 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.
|
|
|
|
|
*
|
|
|
|
|
* Under Section 7 of GPL version 3, you are granted additional
|
|
|
|
|
* permissions described in the GCC Runtime Library Exception, version
|
|
|
|
|
* 3.1, as published by the Free Software Foundation.
|
|
|
|
|
*
|
|
|
|
|
* You should have received a copy of the GNU General Public License and
|
|
|
|
|
* a copy of the GCC Runtime Library Exception along with this program;
|
|
|
|
|
* see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
|
|
|
* <http://www.gnu.org/licenses/>.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
/* 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:
|
2014-09-21 17:33:12 +00:00
|
|
|
/* Use a longcall sequence in the non PIC case on VxWorks, to prevent
|
|
|
|
|
possible relocation errors if this is module-loaded very far away from
|
|
|
|
|
the 'abort' entry point. */
|
|
|
|
|
#if defined (__VXWORKS__) && ! (defined __PIC__ || defined __pic__)
|
|
|
|
|
lis r11,JUMP_TARGET(abort)@ha
|
|
|
|
|
addic r11,r11,JUMP_TARGET(abort)@l
|
|
|
|
|
mtlr r11
|
|
|
|
|
blrl
|
|
|
|
|
#else
|
|
|
|
|
|
2012-03-27 23:13:14 +00:00
|
|
|
#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
|
2014-09-21 17:33:12 +00:00
|
|
|
|
|
|
|
|
#elif _CALL_ELF == 2
|
|
|
|
|
.type trampoline_initial,@object
|
|
|
|
|
.align 3
|
|
|
|
|
trampoline_initial:
|
|
|
|
|
ld r11,.Lchain(r12)
|
|
|
|
|
ld r12,.Lfunc(r12)
|
|
|
|
|
mtctr r12
|
|
|
|
|
bctr
|
|
|
|
|
.Lfunc = .-trampoline_initial
|
|
|
|
|
.quad 0 /* will be replaced with function address */
|
|
|
|
|
.Lchain = .-trampoline_initial
|
|
|
|
|
.quad 0 /* will be replaced with static chain */
|
|
|
|
|
|
|
|
|
|
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 */
|
|
|
|
|
|
|
|
|
|
.pushsection ".toc","aw"
|
|
|
|
|
.LC0:
|
|
|
|
|
.quad trampoline_initial-8
|
|
|
|
|
.popsection
|
|
|
|
|
|
|
|
|
|
FUNC_START(__trampoline_setup)
|
|
|
|
|
addis 7,2,.LC0@toc@ha
|
|
|
|
|
ld 7,.LC0@toc@l(7) /* trampoline address -8 */
|
|
|
|
|
|
|
|
|
|
li r8,trampoline_size /* verify that the trampoline is big enough */
|
|
|
|
|
cmpw cr1,r8,r4
|
|
|
|
|
srwi r4,r4,3 /* # doublewords to move */
|
|
|
|
|
addi r9,r3,-8 /* adjust pointer for stdu */
|
|
|
|
|
mtctr r4
|
|
|
|
|
blt cr1,.Labort
|
|
|
|
|
|
|
|
|
|
/* Copy the instructions to the stack */
|
|
|
|
|
.Lmove:
|
|
|
|
|
ldu r10,8(r7)
|
|
|
|
|
stdu r10,8(r9)
|
|
|
|
|
bdnz .Lmove
|
|
|
|
|
|
|
|
|
|
/* Store correct function and static chain */
|
|
|
|
|
std r5,.Lfunc(r3)
|
|
|
|
|
std r6,.Lchain(r3)
|
|
|
|
|
|
|
|
|
|
/* Now flush both caches */
|
|
|
|
|
mtctr r4
|
|
|
|
|
.Lcache:
|
|
|
|
|
icbi 0,r3
|
|
|
|
|
dcbf 0,r3
|
|
|
|
|
addi r3,r3,8
|
|
|
|
|
bdnz .Lcache
|
|
|
|
|
|
|
|
|
|
/* Finally synchronize things & return */
|
|
|
|
|
sync
|
|
|
|
|
isync
|
|
|
|
|
blr
|
|
|
|
|
|
|
|
|
|
.Labort:
|
|
|
|
|
bl JUMP_TARGET(abort)
|
|
|
|
|
nop
|
|
|
|
|
FUNC_END(__trampoline_setup)
|
|
|
|
|
|
|
|
|
|
#endif
|
