100 lines
3.3 KiB
C
100 lines
3.3 KiB
C
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/* DWARF2 EH unwinding support for TILEPro.
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Copyright (C) 2011-2022 Free Software Foundation, Inc.
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Contributed by Walter Lee (walt@tilera.com)
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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
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it 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,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public 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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#ifndef inhibit_libc
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#include <arch/abi.h>
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#include <signal.h>
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#include <sys/ucontext.h>
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#include <linux/unistd.h>
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/* Macro to define a copy of the kernel's __rt_sigreturn function
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(in arch/tile/kernel/entry.S). If that function is changed,
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this one needs to be changed to match it. */
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#define _sigreturn_asm(REG, NR) asm( \
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".pushsection .text.__rt_sigreturn,\"a\"\n" \
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".global __rt_sigreturn\n" \
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".type __rt_sigreturn,@function\n" \
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"__rt_sigreturn:\n" \
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"moveli " #REG ", " #NR "\n" \
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"swint1\n" \
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".size __rt_sigreturn, . - __rt_sigreturn\n" \
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".popsection")
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#define sigreturn_asm(REG, NR) _sigreturn_asm(REG, NR)
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sigreturn_asm (TREG_SYSCALL_NR_NAME, __NR_rt_sigreturn);
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#define SIGRETURN_LEN 16
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extern char __rt_sigreturn[];
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#define MD_FALLBACK_FRAME_STATE_FOR tile_fallback_frame_state
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static _Unwind_Reason_Code
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tile_fallback_frame_state (struct _Unwind_Context *context,
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_Unwind_FrameState *fs)
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{
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unsigned char *pc = context->ra;
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struct sigcontext *sc;
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long new_cfa;
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int i;
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struct rt_sigframe {
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unsigned char save_area[C_ABI_SAVE_AREA_SIZE];
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siginfo_t info;
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ucontext_t uc;
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} *rt_;
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/* Return if this is not a signal handler. */
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if (memcmp (pc, __rt_sigreturn, SIGRETURN_LEN) != 0)
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return _URC_END_OF_STACK;
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/* It was a signal handler; update the reported PC to point to our
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copy, since that will be findable with dladdr() and therefore
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somewhat easier to help understand what actually happened. */
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context->ra = __rt_sigreturn;
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rt_ = context->cfa;
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sc = &rt_->uc.uc_mcontext;
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new_cfa = sc->sp;
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fs->regs.cfa_how = CFA_REG_OFFSET;
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fs->regs.cfa_reg = __LIBGCC_STACK_POINTER_REGNUM__;
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fs->regs.cfa_offset = new_cfa - (long) context->cfa;
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for (i = 0; i < 56; ++i)
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{
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fs->regs.reg[i].how = REG_SAVED_OFFSET;
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fs->regs.reg[i].loc.offset
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= (long)&sc->gregs[i] - new_cfa;
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}
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fs->regs.reg[56].how = REG_SAVED_OFFSET;
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fs->regs.reg[56].loc.offset = (long)&sc->pc - new_cfa;
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fs->retaddr_column = 56;
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fs->signal_frame = 1;
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return _URC_NO_REASON;
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}
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#endif /* ifdef inhibit_libc */
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