2012-03-27 23:13:14 +00:00
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/* Special support for trampolines
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*
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2017-04-10 11:32:00 +00:00
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* Copyright (C) 1996-2016 Free Software Foundation, Inc.
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2012-03-27 23:13:14 +00:00
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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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#include "darwin-asm.h"
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/* Set up trampolines. */
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.text
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.align LOG2_GPR_BYTES
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Ltrampoline_initial:
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mflr r0
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bl 1f
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Lfunc = .-Ltrampoline_initial
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.g_long 0 /* will be replaced with function address */
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Lchain = .-Ltrampoline_initial
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.g_long 0 /* will be replaced with static chain */
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1: mflr r11
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lg r12,0(r11) /* function address */
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mtlr r0
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mtctr r12
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lg r11,GPR_BYTES(r11) /* static chain */
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bctr
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trampoline_size = .-Ltrampoline_initial
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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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.globl ___trampoline_setup
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___trampoline_setup:
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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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LCF0:
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mflr r11
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addis r7,r11,ha16(LTRAMP-LCF0)
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lg r7,lo16(LTRAMP-LCF0)(r7)
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subi r7,r7,4
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li r8,trampoline_size /* verify trampoline big enough */
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cmpg cr1,r8,r4
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srwi r4,r4,2 /* # words to move (insns always 4-byte) */
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addi r9,r3,-4 /* adjust pointer for lgu */
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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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stg r5,Lfunc(r3)
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stg 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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/* Ensure cache-flushing has finished. */
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sync
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isync
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/* Make stack writeable. */
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b ___enable_execute_stack
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Labort:
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#ifdef __DYNAMIC__
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bl L_abort$stub
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.data
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.section __TEXT,__picsymbolstub1,symbol_stubs,pure_instructions,32
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.align 2
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L_abort$stub:
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.indirect_symbol _abort
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mflr r0
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bcl 20,31,L0$_abort
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L0$_abort:
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mflr r11
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addis r11,r11,ha16(L_abort$lazy_ptr-L0$_abort)
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mtlr r0
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lgu r12,lo16(L_abort$lazy_ptr-L0$_abort)(r11)
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mtctr r12
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bctr
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.data
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.lazy_symbol_pointer
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L_abort$lazy_ptr:
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.indirect_symbol _abort
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.g_long dyld_stub_binding_helper
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#else
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bl _abort
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#endif
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.data
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.align LOG2_GPR_BYTES
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LTRAMP:
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.g_long Ltrampoline_initial
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