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51 lines
1.7 KiB
C
51 lines
1.7 KiB
C
/* DWARF2 EH unwinding support for RISC-V Linux.
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Copyright (C) 2014 Free Software Foundation, Inc.
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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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/* Examine the code and attempt to identify a signal frame. */
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#include <stdlib.h>
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#include <asm-generic/unistd.h>
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#define MD_FALLBACK_FRAME_STATE_FOR riscv_fallback_frame_state
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static _Unwind_Reason_Code
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riscv_fallback_frame_state (struct _Unwind_Context *context,
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_Unwind_FrameState *fs)
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{
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unsigned int *pc = (unsigned int *) context->ra;
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/* Signal frames begin with the following code sequence:
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li v0, __NR_rt_sigreturn
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scall */
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if (((unsigned long)pc & 0x3) != 0
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|| pc[0] != RISCV_ITYPE (ADDI, GP_RETURN, 0, __NR_rt_sigreturn)
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|| pc[1] != RISCV_ITYPE (SCALL, 0, 0, 0))
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return _URC_END_OF_STACK;
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/* TODO: Actually implement this. */
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abort();
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}
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#endif
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