| /* DWARF2 EH unwinding support for TILEPro. |
| Copyright (C) 2011-2021 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef inhibit_libc |
| |
| #include <arch/abi.h> |
| #include <signal.h> |
| #include <sys/ucontext.h> |
| #include <linux/unistd.h> |
| |
| /* 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; |
| ucontext_t 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 */ |