1 /* DWARF2 EH unwinding support for AIX.
2 Copyright (C) 2011 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
11 GCC is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
14 License for more details.
16 Under Section 7 of GPL version 3, you are granted additional
17 permissions described in the GCC Runtime Library Exception, version
18 3.1, as published by the Free Software Foundation.
20 You should have received a copy of the GNU General Public License and
21 a copy of the GCC Runtime Library Exception along with this program;
22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 <http://www.gnu.org/licenses/>. */
25 /* If the current unwind info (FS) does not contain explicit info
26 saving R2, then we have to do a minor amount of code reading to
27 figure out if it was saved. The big problem here is that the
28 code that does the save/restore is generated by the linker, so
29 we have no good way to determine at compile time what to do. */
34 #define MD_FROB_UPDATE_CONTEXT(CTX, FS) \
36 if ((FS)->regs.reg[2].how == REG_UNSAVED) \
40 _Unwind_GetGR ((CTX), R_LR); \
41 if (*insn == 0xE8410028) \
42 _Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 40); \
46 #define MD_FROB_UPDATE_CONTEXT(CTX, FS) \
48 if ((FS)->regs.reg[2].how == REG_UNSAVED) \
52 _Unwind_GetGR ((CTX), R_LR); \
53 if (*insn == 0x80410014) \
54 _Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 20); \