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/* Special support for trampolines
*
* Copyright (C) 1996-2020 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 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/>.
*/
#include "darwin-asm.h"
/* Set up trampolines. */
.text
.align LOG2_GPR_BYTES
Ltrampoline_initial:
mflr r0
bl 1f
Lfunc = .-Ltrampoline_initial
.g_long 0 /* will be replaced with function address */
Lchain = .-Ltrampoline_initial
.g_long 0 /* will be replaced with static chain */
1: mflr r11
lg r12,0(r11) /* function address */
mtlr r0
mtctr r12
lg r11,GPR_BYTES(r11) /* static chain */
bctr
trampoline_size = .-Ltrampoline_initial
/* R3 = stack address to store trampoline */
/* R4 = length of trampoline area */
/* R5 = function address */
/* R6 = static chain */
.globl ___trampoline_setup
___trampoline_setup:
mflr r0 /* save return address */
bcl 20,31,LCF0 /* load up __trampoline_initial into r7 */
LCF0:
mflr r11
addis r7,r11,ha16(LTRAMP-LCF0)
lg r7,lo16(LTRAMP-LCF0)(r7)
subi r7,r7,4
li r8,trampoline_size /* verify trampoline big enough */
cmpg cr1,r8,r4
srwi r4,r4,2 /* # words to move (insns always 4-byte) */
addi r9,r3,-4 /* adjust pointer for lgu */
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 */
stg r5,Lfunc(r3)
stg r6,Lchain(r3)
/* Now flush both caches */
mtctr r4
Lcache:
icbi 0,r3
dcbf 0,r3
addi r3,r3,4
bdnz Lcache
/* Ensure cache-flushing has finished. */
sync
isync
/* Make stack writeable. */
b ___enable_execute_stack
Labort:
#ifdef __DYNAMIC__
bl L_abort$stub
.data
.section __TEXT,__picsymbolstub1,symbol_stubs,pure_instructions,32
.align 2
L_abort$stub:
.indirect_symbol _abort
mflr r0
bcl 20,31,L0$_abort
L0$_abort:
mflr r11
addis r11,r11,ha16(L_abort$lazy_ptr-L0$_abort)
mtlr r0
lgu r12,lo16(L_abort$lazy_ptr-L0$_abort)(r11)
mtctr r12
bctr
.data
.lazy_symbol_pointer
L_abort$lazy_ptr:
.indirect_symbol _abort
.g_long dyld_stub_binding_helper
#else
bl _abort
#endif
.data
.align LOG2_GPR_BYTES
LTRAMP:
.g_long Ltrampoline_initial
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