diff options
Diffstat (limited to 'gcc-4.9/libgcc/config/rs6000/tramp.S')
| -rw-r--r-- | gcc-4.9/libgcc/config/rs6000/tramp.S | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/gcc-4.9/libgcc/config/rs6000/tramp.S b/gcc-4.9/libgcc/config/rs6000/tramp.S new file mode 100644 index 000000000..6f435b5d8 --- /dev/null +++ b/gcc-4.9/libgcc/config/rs6000/tramp.S @@ -0,0 +1,185 @@ +/* Special support for trampolines + * + * Copyright (C) 1996-2014 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/>. + */ + +/* 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: +/* 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 + +#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 + +#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 |