1 /* DWARF2 EH unwinding support for OpenRISC. 2 Copyright (C) 2011, 2012 3 Free Software Foundation, Inc. 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3, or (at your option) 10 any later version. 11 12 GCC is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 Under Section 7 of GPL version 3, you are granted additional 18 permissions described in the GCC Runtime Library Exception, version 19 3.1, as published by the Free Software Foundation. 20 21 You should have received a copy of the GNU General Public License and 22 a copy of the GCC Runtime Library Exception along with this program; 23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 <http://www.gnu.org/licenses/>. */ 25 26 #ifndef inhibit_libc 27 28 #include <signal.h> 29 #include <sys/ucontext.h> 30 #include <linux/unistd.h> 31 32 #define MD_FALLBACK_FRAME_STATE_FOR or1k_fallback_frame_state 33 34 static _Unwind_Reason_Code 35 or1k_fallback_frame_state (struct _Unwind_Context *context, 36 _Unwind_FrameState *fs) 37 { 38 struct rt_sigframe { 39 siginfo_t info; 40 struct ucontext uc; 41 } *frame = context->cfa; 42 43 struct sigcontext *sc; 44 unsigned char *pc = context->ra; 45 long new_cfa; 46 int i; 47 48 /* 49 * Note: These have to be the same as in the kernel. 50 * Please see arch/openrisc/kernel/signal.c 51 */ 52 if (!(*(unsigned short *)(pc + 0) == 0xa960 53 && *(unsigned short *)(pc + 2) == __NR_rt_sigreturn 54 && *(unsigned long *)(pc + 4) == 0x20000001 55 && *(unsigned long *)(pc + 8) == 0x15000000)) 56 return _URC_END_OF_STACK; 57 58 sc = (struct sigcontext *) &frame->uc.uc_mcontext; 59 60 new_cfa = sc->regs.gpr[1]; 61 fs->regs.cfa_how = CFA_REG_OFFSET; 62 fs->regs.cfa_reg = STACK_POINTER_REGNUM; 63 fs->regs.cfa_offset = new_cfa - (long) context->cfa; 64 65 for (i = 0; i < 32; ++i) 66 { 67 fs->regs.reg[i].how = REG_SAVED_OFFSET; 68 fs->regs.reg[i].loc.offset = (long)&sc->regs.gpr[i] - new_cfa; 69 } 70 71 fs->retaddr_column = 9; 72 fs->signal_frame = 1; 73 74 return _URC_NO_REASON; 75 } 76 77 #endif /* ifdef inhibit_libc */ 78