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Diffstat (limited to 'gcc-4.2.1-5666.3/gcc/config/rs6000/darwin-tramp.asm')
| -rw-r--r-- | gcc-4.2.1-5666.3/gcc/config/rs6000/darwin-tramp.asm | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/gcc-4.2.1-5666.3/gcc/config/rs6000/darwin-tramp.asm b/gcc-4.2.1-5666.3/gcc/config/rs6000/darwin-tramp.asm new file mode 100644 index 000000000..62522b9e3 --- /dev/null +++ b/gcc-4.2.1-5666.3/gcc/config/rs6000/darwin-tramp.asm @@ -0,0 +1,135 @@ +/* Special support for trampolines + * + * Copyright (C) 1996, 1997, 2000, 2004, 2005 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. + */ + +#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 + |