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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgcc/] [config/] [rs6000/] [aix-unwind.h] - Blame information for rev 734

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1 734 jeremybenn
/* DWARF2 EH unwinding support for AIX.
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   Copyright (C) 2011 Free Software Foundation, Inc.
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   This file is part of GCC.
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   GCC is free software; you can redistribute it and/or modify it
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   under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3, or (at your option)
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   any later version.
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   GCC is distributed in the hope that it will be useful, but WITHOUT
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   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
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   License for more details.
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   Under Section 7 of GPL version 3, you are granted additional
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   permissions described in the GCC Runtime Library Exception, version
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   3.1, as published by the Free Software Foundation.
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   You should have received a copy of the GNU General Public License and
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   a copy of the GCC Runtime Library Exception along with this program;
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   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
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   <http://www.gnu.org/licenses/>.  */
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/* If the current unwind info (FS) does not contain explicit info
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   saving R2, then we have to do a minor amount of code reading to
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   figure out if it was saved.  The big problem here is that the
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   code that does the save/restore is generated by the linker, so
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   we have no good way to determine at compile time what to do.  */
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#define R_LR 65
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#ifdef __64BIT__
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#define MD_FROB_UPDATE_CONTEXT(CTX, FS)                                 \
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  do {                                                                  \
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    if ((FS)->regs.reg[2].how == REG_UNSAVED)                           \
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      {                                                                 \
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        unsigned int *insn                                              \
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          = (unsigned int *)                                            \
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            _Unwind_GetGR ((CTX), R_LR);                                \
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        if (*insn == 0xE8410028)                                        \
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          _Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 40);                 \
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      }                                                                 \
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  } while (0)
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#else
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#define MD_FROB_UPDATE_CONTEXT(CTX, FS)                                 \
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  do {                                                                  \
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    if ((FS)->regs.reg[2].how == REG_UNSAVED)                           \
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      {                                                                 \
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        unsigned int *insn                                              \
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          = (unsigned int *)                                            \
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            _Unwind_GetGR ((CTX), R_LR);                                \
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        if (*insn == 0x80410014)                                        \
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          _Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 20);                 \
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      }                                                                 \
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  } while (0)
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#endif

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