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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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