/* DWARF2 EH unwinding support for TILEPro. Copyright (C) 2011-2015 Free Software Foundation, Inc. Contributed by Walter Lee (walt@tilera.com) 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 . */ #ifndef inhibit_libc #include #include #include #include /* Macro to define a copy of the kernel's __rt_sigreturn function (in arch/tile/kernel/entry.S). If that function is changed, this one needs to be changed to match it. */ #define _sigreturn_asm(REG, NR) asm( \ ".pushsection .text.__rt_sigreturn,\"a\"\n" \ ".global __rt_sigreturn\n" \ ".type __rt_sigreturn,@function\n" \ "__rt_sigreturn:\n" \ "moveli " #REG ", " #NR "\n" \ "swint1\n" \ ".size __rt_sigreturn, . - __rt_sigreturn\n" \ ".popsection") #define sigreturn_asm(REG, NR) _sigreturn_asm(REG, NR) sigreturn_asm (TREG_SYSCALL_NR_NAME, __NR_rt_sigreturn); #define SIGRETURN_LEN 16 extern char __rt_sigreturn[]; #define MD_FALLBACK_FRAME_STATE_FOR tile_fallback_frame_state static _Unwind_Reason_Code tile_fallback_frame_state (struct _Unwind_Context *context, _Unwind_FrameState *fs) { unsigned char *pc = context->ra; struct sigcontext *sc; long new_cfa; int i; struct rt_sigframe { unsigned char save_area[C_ABI_SAVE_AREA_SIZE]; siginfo_t info; struct ucontext uc; } *rt_; /* Return if this is not a signal handler. */ if (memcmp (pc, __rt_sigreturn, SIGRETURN_LEN) != 0) return _URC_END_OF_STACK; /* It was a signal handler; update the reported PC to point to our copy, since that will be findable with dladdr() and therefore somewhat easier to help understand what actually happened. */ context->ra = __rt_sigreturn; rt_ = context->cfa; sc = &rt_->uc.uc_mcontext; new_cfa = sc->sp; fs->regs.cfa_how = CFA_REG_OFFSET; fs->regs.cfa_reg = __LIBGCC_STACK_POINTER_REGNUM__; fs->regs.cfa_offset = new_cfa - (long) context->cfa; for (i = 0; i < 56; ++i) { fs->regs.reg[i].how = REG_SAVED_OFFSET; fs->regs.reg[i].loc.offset = (long)&sc->gregs[i] - new_cfa; } fs->regs.reg[56].how = REG_SAVED_OFFSET; fs->regs.reg[56].loc.offset = (long)&sc->pc - new_cfa; fs->retaddr_column = 56; fs->signal_frame = 1; return _URC_NO_REASON; } #endif /* ifdef inhibit_libc */