193 lines
4.5 KiB
ArmAsm
193 lines
4.5 KiB
ArmAsm
/* Special support for trampolines
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*
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* Copyright (C) 1996-2022 Free Software Foundation, Inc.
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* Written By Michael Meissner
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*
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* This file is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 3, or (at your option) any
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* later version.
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*
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* This file is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* Under Section 7 of GPL version 3, you are granted additional
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* permissions described in the GCC Runtime Library Exception, version
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* 3.1, as published by the Free Software Foundation.
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*
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* You should have received a copy of the GNU General Public License and
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* a copy of the GCC Runtime Library Exception along with this program;
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* see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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/* Set up trampolines. */
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.section ".text"
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#include "ppc-asm.h"
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#include "config.h"
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#ifndef __powerpc64__
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.type trampoline_initial,@object
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.align 2
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trampoline_initial:
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mflr r0
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bcl 20,31,1f
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.Lfunc = .-trampoline_initial
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.long 0 /* will be replaced with function address */
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.Lchain = .-trampoline_initial
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.long 0 /* will be replaced with static chain */
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1: mflr r11
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mtlr r0
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lwz r0,0(r11) /* function address */
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lwz r11,4(r11) /* static chain */
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mtctr r0
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bctr
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trampoline_size = .-trampoline_initial
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.size trampoline_initial,trampoline_size
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/* R3 = stack address to store trampoline */
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/* R4 = length of trampoline area */
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/* R5 = function address */
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/* R6 = static chain */
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FUNC_START(__trampoline_setup)
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.cfi_startproc
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mflr r0 /* save return address */
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bcl 20,31,.LCF0 /* load up __trampoline_initial into r7 */
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.cfi_register lr,r0
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.LCF0:
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mflr r11
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addi r7,r11,trampoline_initial-4-.LCF0 /* trampoline address -4 */
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cmpwi cr1,r4,trampoline_size /* verify that the trampoline is big enough */
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srwi r4,r4,2 /* # words to move */
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addi r9,r3,-4 /* adjust pointer for lwzu */
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mtctr r4
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blt cr1,.Labort
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mtlr r0
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/* Copy the instructions to the stack */
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.Lmove:
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lwzu r10,4(r7)
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stwu r10,4(r9)
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bdnz .Lmove
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/* Store correct function and static chain */
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stw r5,.Lfunc(r3)
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stw r6,.Lchain(r3)
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/* Now flush both caches */
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mtctr r4
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.Lcache:
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icbi 0,r3
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dcbf 0,r3
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addi r3,r3,4
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bdnz .Lcache
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/* Finally synchronize things & return */
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sync
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isync
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blr
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.Labort:
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/* Use a longcall sequence in the non PIC case on VxWorks, to prevent
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possible relocation errors if this is module-loaded very far away from
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the 'abort' entry point. */
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#if defined (__VXWORKS__) && ! (defined __PIC__ || defined __pic__)
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lis r11,JUMP_TARGET(abort)@ha
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addic r11,r11,JUMP_TARGET(abort)@l
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mtlr r11
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blrl
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#else
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#if (defined __PIC__ || defined __pic__) && defined HAVE_AS_REL16
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bcl 20,31,1f
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1: mflr r30
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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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#endif
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bl JUMP_TARGET(abort)
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#endif
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.cfi_endproc
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FUNC_END(__trampoline_setup)
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#elif _CALL_ELF == 2
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.type trampoline_initial,@object
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.align 3
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trampoline_initial:
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ld r11,.Lchain(r12)
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ld r12,.Lfunc(r12)
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mtctr r12
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bctr
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.Lfunc = .-trampoline_initial
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.quad 0 /* will be replaced with function address */
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.Lchain = .-trampoline_initial
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.quad 0 /* will be replaced with static chain */
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trampoline_size = .-trampoline_initial
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.size trampoline_initial,trampoline_size
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/* R3 = stack address to store trampoline */
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/* R4 = length of trampoline area */
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/* R5 = function address */
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/* R6 = static chain */
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#ifndef __PCREL__
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.pushsection ".toc","aw"
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.LC0:
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.quad trampoline_initial-8
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.popsection
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#endif
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FUNC_START(__trampoline_setup)
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.cfi_startproc
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#ifdef __PCREL__
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pla 7,(trampoline_initial-8)@pcrel
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#else
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addis 7,2,.LC0@toc@ha
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ld 7,.LC0@toc@l(7) /* trampoline address -8 */
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#endif
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cmpwi cr1,r4,trampoline_size /* verify that the trampoline is big enough */
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srwi r4,r4,3 /* # doublewords to move */
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addi r9,r3,-8 /* adjust pointer for stdu */
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mtctr r4
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blt cr1,.Labort
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/* Copy the instructions to the stack */
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.Lmove:
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ldu r10,8(r7)
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stdu r10,8(r9)
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bdnz .Lmove
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/* Store correct function and static chain */
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std r5,.Lfunc(r3)
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std r6,.Lchain(r3)
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/* Now flush both caches */
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mtctr r4
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.Lcache:
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icbi 0,r3
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dcbf 0,r3
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addi r3,r3,8
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bdnz .Lcache
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/* Finally synchronize things & return */
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sync
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isync
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blr
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.Labort:
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bl JUMP_TARGET(abort)
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nop
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.cfi_endproc
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FUNC_END(__trampoline_setup)
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#endif
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