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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [config/] [xtensa/] [linux-unwind.h] - Rev 289
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/* DWARF2 EH unwinding support for Xtensa. Copyright (C) 2008, 2009 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/>. */ /* Do code reading to identify a signal frame, and set the frame state data appropriately. See unwind-dw2-xtensa.c for the structs. Don't use this at all if inhibit_libc is used. */ #ifndef inhibit_libc #include <signal.h> #include <sys/ucontext.h> /* Encoded bytes for Xtensa instructions: movi a2, __NR_rt_sigreturn syscall entry (first byte only) Some of the bytes are endian-dependent. */ #define MOVI_BYTE0 0x22 #define MOVI_BYTE2 225 /* __NR_rt_sigreturn */ #define SYSC_BYTE0 0 #define SYSC_BYTE2 0 #ifdef __XTENSA_EB__ #define MOVI_BYTE1 0x0a #define SYSC_BYTE1 0x05 #define ENTRY_BYTE 0x6c #else #define MOVI_BYTE1 0xa0 #define SYSC_BYTE1 0x50 #define ENTRY_BYTE 0x36 #endif #define MD_FALLBACK_FRAME_STATE_FOR xtensa_fallback_frame_state static _Unwind_Reason_Code xtensa_fallback_frame_state (struct _Unwind_Context *context, _Unwind_FrameState *fs) { unsigned char *pc = context->ra; struct sigcontext *sc; struct rt_sigframe { struct siginfo info; struct ucontext uc; } *rt_; /* movi a2, __NR_rt_sigreturn; syscall */ if (pc[0] != MOVI_BYTE0 || pc[1] != MOVI_BYTE1 || pc[2] != MOVI_BYTE2 || pc[3] != SYSC_BYTE0 || pc[4] != SYSC_BYTE1 || pc[5] != SYSC_BYTE2) return _URC_END_OF_STACK; rt_ = context->sp; sc = &rt_->uc.uc_mcontext; fs->signal_regs = (_Unwind_Word *) sc->sc_a; /* If the signal arrived just before an ENTRY instruction, find the return address and pretend the signal arrived before executing the CALL. */ if (*(unsigned char *) sc->sc_pc == ENTRY_BYTE) { unsigned callinc = (sc->sc_ps >> 16) & 3; fs->signal_ra = ((sc->sc_a[callinc << 2] & XTENSA_RA_FIELD_MASK) | context->ra_high_bits) - 3; } else fs->signal_ra = sc->sc_pc; fs->signal_frame = 1; return _URC_NO_REASON; } #endif /* ifdef inhibit_libc */
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