54 lines
1.9 KiB
C++
54 lines
1.9 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "common/scummsys.h"
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#ifdef USE_ELF_LOADER
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/**
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* These functions are a hack to workaround a GCC limitation
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* At every function entry, GCC adds a check on the stack size
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* If the stack is too small, the functions _rt_stkovf_split_small or _rt_stkovf_split_big are called
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* This call is done using a PC relative 24 bits address but we want to link back to main executable functions
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* and this is not possible using this relocation type.
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* So we create wrapper functions which will just jump to the main function using a 32 bits relocation.
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* The wrapping is done by ld thanks to its --wrap argument
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*/
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__asm__ (
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".global __wrap___rt_stkovf_split_small\n"
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".type __wrap___rt_stkovf_split_small, %function\n"
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"__wrap___rt_stkovf_split_small:\n"
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"LDR pc, .Lsmall\n"
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".Lsmall:\n"
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".word __real___rt_stkovf_split_small\n"
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);
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__asm__ (
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".global __wrap___rt_stkovf_split_big\n"
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".type __wrap___rt_stkovf_split_big, %function\n"
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"__wrap___rt_stkovf_split_big:\n"
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"LDR pc, .Lbig\n"
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".Lbig:\n"
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".word __real___rt_stkovf_split_big\n"
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);
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#endif
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