154 lines
4.0 KiB
C
154 lines
4.0 KiB
C
/* DWARF2 EH unwinding support for ARC Linux.
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Copyright (C) 2017-2019 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 it
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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, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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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
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and a copy of the GCC Runtime Library Exception along with this
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program; see the files COPYING3 and COPYING.RUNTIME respectively.
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If not, see <http://www.gnu.org/licenses/>. */
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/* This order is defined by a structure in the kernel, in file
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arch/arc/kernel/signal.c. */
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#define REGISTER_IN_STACK(REG_NAME, ID) \
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REG_NAME,
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enum registers_stack_order {
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REGISTER_STACK_ORDER_START = -1,
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#include "config/arc/linux-unwind-reg.def"
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REGISTER_STACK_ORDER_SIZE,
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};
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struct register_position {
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int reg_id;
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int offset_in_stack;
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};
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#undef REGISTER_IN_STACK
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#define REGISTER_SIZE_IN_WORDS 4
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#define REGISTER_IN_STACK(REG_NAME, ID) (int) ID,
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int
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register_id_for_index[REGISTER_STACK_ORDER_SIZE] = {
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#include "config/arc/linux-unwind-reg.def"
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};
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#undef REGISTER_IN_STACK
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#ifndef inhibit_libc
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/* Do code reading to identify a signal frame, and set the frame
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state data appropriately. See unwind-dw2.c for the structs. */
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#include <signal.h>
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#include <asm/unistd.h>
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/*
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00010edc <__default_rt_sa_restorer>:
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10edc: 208a 12c2 mov r8,139
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10ee0: 781e trap_s 0
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10ee2: 7ee0 j_s [blink]
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*/
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#if __BIG_ENDIAN__
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#define MOV_R8_139 0x8a20c212
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#define TRAP_S_J_S_BLINK 0x1e78e07e
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#define SWI 0x6f223f00
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#elif __LITTLE_ENDIAN__
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#define MOV_R8_139 0x12c2208a
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#define TRAP_S_J_S_BLINK 0x7ee0781e
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#define SWI 0x003f226f
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#endif
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#define MD_FALLBACK_FRAME_STATE_FOR arc_fallback_frame_state
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static __attribute__((noinline)) _Unwind_Reason_Code
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arc_fallback_frame_state (struct _Unwind_Context *context,
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_Unwind_FrameState *fs)
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{
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struct rt_sigframe {
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siginfo_t info;
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ucontext_t uc;
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unsigned int sigret_magic;
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};
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struct rt_sigframe *rt_;
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u_int32_t *pc = (u_int32_t *) context->ra;
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struct sigcontext *sc;
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_Unwind_Ptr new_cfa;
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int i;
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#ifdef __ARC700__
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if (pc[1] != SWI)
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return _URC_END_OF_STACK;
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#else
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if (pc[1] != TRAP_S_J_S_BLINK)
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return _URC_END_OF_STACK;
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#endif
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if (pc[0] == MOV_R8_139)
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{
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rt_ = context->cfa;
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sc = &rt_->uc.uc_mcontext;
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}
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else
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return _URC_END_OF_STACK;
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new_cfa = (_Unwind_Ptr) sc;
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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 - (_Unwind_Ptr) context->cfa;
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unsigned long *regs = &sc->regs.scratch.bta;
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for (i = 0; i < REGISTER_STACK_ORDER_SIZE; i++)
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{
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if (register_id_for_index[i] == -1)
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continue;
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fs->regs.reg[register_id_for_index[i]].how = REG_SAVED_OFFSET;
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fs->regs.reg[register_id_for_index[i]].loc.offset
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= ((_Unwind_Ptr) &(regs[i])) - new_cfa;
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}
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fs->regs.reg[31].how = REG_SAVED_VAL_OFFSET;
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fs->regs.reg[31].loc.offset = ((_Unwind_Ptr) (regs[ret])) - new_cfa;
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fs->retaddr_column = 31;
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return _URC_NO_REASON;
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}
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#endif
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#define MD_FROB_UPDATE_CONTEXT arc_frob_update_context
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/* Save fp register for unwinding to work. */
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static void
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arc_frob_update_context (struct _Unwind_Context *context,
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_Unwind_FrameState *fs)
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{
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_Unwind_Word fp_val;
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asm ("mov %0,fp" : "=r" (fp_val));
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switch (fs->regs.reg[27].how)
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{
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case REG_UNSAVED:
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case REG_UNDEFINED:
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if (context->reg[27] == NULL)
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_Unwind_SetGRValue (context, 27, fp_val);
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break;
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default:
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break;
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}
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}
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