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129 lines
4.0 KiB
C
129 lines
4.0 KiB
C
/* DWARF2 EH unwinding support for C-SKY Linux.
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Copyright (C) 2018-2019 Free Software Foundation, Inc.
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Contributed by C-SKY Microsystems and Mentor Graphics.
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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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/* Do code reading to identify a signal frame, and set the frame state data
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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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#define TRAP0_V1 0x0008
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#define MOVI_R1_119_V1 (0x6000 + (119 << 4) + 1)
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#define MOVI_R1_127_V1 (0x6000 + (127 << 4) + 1)
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#define ADDI_R1_32_V1 (0x2000 + (31 << 4) + 1)
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#define ADDI_R1_14_V1 (0x2000 + (13 << 4) + 1)
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#define ADDI_R1_12_V1 (0x2000 + (11 << 4) + 1)
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#define TRAP0_V2_PART0 0xc000
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#define TRAP0_V2_PART1 0x2020
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#define MOVI_R7_119_V2_PART0 0xea07
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#define MOVI_R7_119_V2_PART1 119
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#define MOVI_R7_173_V2_PART0 0xea07
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#define MOVI_R7_173_V2_PART1 173
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#define MOVI_R7_139_V2_PART0 0xea07
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#define MOVI_R7_139_V2_PART1 139
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#define sc_pt_regs(x) (sc->sc_pt_regs.x)
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#define sc_pt_regs_lr (sc->sc_pt_regs.lr)
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#define sc_pt_regs_tls(x) sc_pt_regs(x)
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#define MD_FALLBACK_FRAME_STATE_FOR csky_fallback_frame_state
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static _Unwind_Reason_Code
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csky_fallback_frame_state (struct _Unwind_Context *context,
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_Unwind_FrameState *fs)
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{
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u_int16_t *pc = (u_int16_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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/* movi r7, __NR_rt_sigreturn; trap 0 */
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if ((*(pc + 0) == MOVI_R7_139_V2_PART0)
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&& (*(pc + 1) == MOVI_R7_139_V2_PART1) && (*(pc + 2) == TRAP0_V2_PART0)
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&& (*(pc + 3) == TRAP0_V2_PART1))
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{
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struct rt_sigframe
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{
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int sig;
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struct siginfo *pinfo;
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void *puc;
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siginfo_t info;
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ucontext_t uc;
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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_pt_regs (usp);
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fs->regs.cfa_how = CFA_REG_OFFSET;
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fs->regs.cfa_reg = STACK_POINTER_REGNUM;
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fs->regs.cfa_offset = new_cfa - (_Unwind_Ptr) context->cfa;
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fs->regs.reg[0].how = REG_SAVED_OFFSET;
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fs->regs.reg[0].loc.offset = (_Unwind_Ptr) & sc_pt_regs (a0) - new_cfa;
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fs->regs.reg[1].how = REG_SAVED_OFFSET;
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fs->regs.reg[1].loc.offset = (_Unwind_Ptr) & sc_pt_regs (a1) - new_cfa;
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fs->regs.reg[2].how = REG_SAVED_OFFSET;
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fs->regs.reg[2].loc.offset = (_Unwind_Ptr) & sc_pt_regs (a2) - new_cfa;
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fs->regs.reg[3].how = REG_SAVED_OFFSET;
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fs->regs.reg[3].loc.offset = (_Unwind_Ptr) & sc_pt_regs (a3) - new_cfa;
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for (i = 4; i < 14; 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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(_Unwind_Ptr) & sc_pt_regs (regs[i - 4]) - new_cfa;
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}
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for (i = 16; i < 31; 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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(_Unwind_Ptr) & sc_pt_regs (exregs[i - 16]) - new_cfa;
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}
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fs->regs.reg[31].loc.offset =
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(_Unwind_Ptr) & sc_pt_regs_tls (tls) - new_cfa;
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/* FIXME : hi lo ? */
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fs->regs.reg[15].how = REG_SAVED_OFFSET;
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fs->regs.reg[15].loc.offset = (_Unwind_Ptr) & sc_pt_regs_lr - new_cfa;
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fs->regs.reg[32].how = REG_SAVED_OFFSET;
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fs->regs.reg[32].loc.offset = (_Unwind_Ptr) & sc_pt_regs (pc) - new_cfa;
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fs->retaddr_column = 32;
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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
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