root / hostregs_helper.h @ 0e607a80
History | View | Annotate | Download (1.8 kB)
1 |
/*
|
---|---|
2 |
* Save/restore host registers.
|
3 |
*
|
4 |
* Copyright (c) 2007 CodeSourcery
|
5 |
*
|
6 |
* This library is free software; you can redistribute it and/or
|
7 |
* modify it under the terms of the GNU Lesser General Public
|
8 |
* License as published by the Free Software Foundation; either
|
9 |
* version 2 of the License, or (at your option) any later version.
|
10 |
*
|
11 |
* This library is distributed in the hope that it will be useful,
|
12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
14 |
* Lesser General Public License for more details.
|
15 |
*
|
16 |
* You should have received a copy of the GNU Lesser General Public
|
17 |
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
|
18 |
*/
|
19 |
|
20 |
/* The GCC global register variable extension is used to reserve some
|
21 |
host registers for use by generated code. However only the core parts of
|
22 |
the translation engine are compiled with these settings. We must manually
|
23 |
save/restore these registers when called from regular code.
|
24 |
It is not sufficient to save/restore T0 et. al. as these may be declared
|
25 |
with a datatype smaller than the actual register. */
|
26 |
|
27 |
#if defined(DECLARE_HOST_REGS)
|
28 |
|
29 |
#define DO_REG(REG) \
|
30 |
register host_reg_t reg_AREG##REG asm(AREG##REG); \ |
31 |
volatile host_reg_t saved_AREG##REG; |
32 |
|
33 |
#elif defined(SAVE_HOST_REGS)
|
34 |
|
35 |
#define DO_REG(REG) \
|
36 |
__asm__ __volatile__ ("" : "=r" (reg_AREG##REG)); \ |
37 |
saved_AREG##REG = reg_AREG##REG; |
38 |
|
39 |
#else
|
40 |
|
41 |
#define DO_REG(REG) \
|
42 |
reg_AREG##REG = saved_AREG##REG; \ |
43 |
__asm__ __volatile__ ("" : : "r" (reg_AREG##REG)); |
44 |
|
45 |
#endif
|
46 |
|
47 |
#ifdef AREG0
|
48 |
DO_REG(0)
|
49 |
#endif
|
50 |
|
51 |
#ifdef AREG1
|
52 |
DO_REG(1)
|
53 |
#endif
|
54 |
|
55 |
#ifdef AREG2
|
56 |
DO_REG(2)
|
57 |
#endif
|
58 |
|
59 |
#undef SAVE_HOST_REGS
|
60 |
#undef DECLARE_HOST_REGS
|
61 |
#undef DO_REG
|