1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "common/scummsys.h"
#ifdef USE_ELF_LOADER
/**
* These functions are a hack to workaround a GCC limitation
* At every function entry, GCC adds a check on the stack size
* If the stack is too small, the functions _rt_stkovf_split_small or _rt_stkovf_split_big are called
* This call is done using a PC relative 24 bits address but we want to link back to main executable functions
* and this is not possible using this relocation type.
* So we create wrapper functions which will just jump to the main function using a 32 bits relocation.
* The wrapping is done by ld thanks to its --wrap argument
*/
__asm__ (
".global __wrap___rt_stkovf_split_small\n"
".type __wrap___rt_stkovf_split_small, %function\n"
"__wrap___rt_stkovf_split_small:\n"
"LDR pc, .Lsmall\n"
".Lsmall:\n"
".word __real___rt_stkovf_split_small\n"
);
__asm__ (
".global __wrap___rt_stkovf_split_big\n"
".type __wrap___rt_stkovf_split_big, %function\n"
"__wrap___rt_stkovf_split_big:\n"
"LDR pc, .Lbig\n"
".Lbig:\n"
".word __real___rt_stkovf_split_big\n"
);
#endif
|
