| /* DWARF2 EH unwinding support for AIX. |
| Copyright (C) 2011 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC 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. |
| |
| GCC 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/>. */ |
| |
| /* If the current unwind info (FS) does not contain explicit info |
| saving R2, then we have to do a minor amount of code reading to |
| figure out if it was saved. The big problem here is that the |
| code that does the save/restore is generated by the linker, so |
| we have no good way to determine at compile time what to do. */ |
| |
| #define R_LR 65 |
| |
| #ifdef __64BIT__ |
| #define MD_FROB_UPDATE_CONTEXT(CTX, FS) \ |
| do { \ |
| if ((FS)->regs.reg[2].how == REG_UNSAVED) \ |
| { \ |
| unsigned int *insn \ |
| = (unsigned int *) \ |
| _Unwind_GetGR ((CTX), R_LR); \ |
| if (*insn == 0xE8410028) \ |
| _Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 40); \ |
| } \ |
| } while (0) |
| #else |
| #define MD_FROB_UPDATE_CONTEXT(CTX, FS) \ |
| do { \ |
| if ((FS)->regs.reg[2].how == REG_UNSAVED) \ |
| { \ |
| unsigned int *insn \ |
| = (unsigned int *) \ |
| _Unwind_GetGR ((CTX), R_LR); \ |
| if (*insn == 0x80410014) \ |
| _Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 20); \ |
| } \ |
| } while (0) |
| #endif |
