1/* DWARF2 EH unwinding support for Blackfin. 2 Copyright (C) 2007-2020 Free Software Foundation, Inc. 3 4This file is part of GCC. 5 6GCC is free software; you can redistribute it and/or modify 7it under the terms of the GNU General Public License as published by 8the Free Software Foundation; either version 3, or (at your option) 9any later version. 10 11GCC is distributed in the hope that it will be useful, 12but WITHOUT ANY WARRANTY; without even the implied warranty of 13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14GNU General Public License for more details. 15 16Under Section 7 of GPL version 3, you are granted additional 17permissions described in the GCC Runtime Library Exception, version 183.1, as published by the Free Software Foundation. 19 20You should have received a copy of the GNU General Public License and 21a copy of the GCC Runtime Library Exception along with this program; 22see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23<http://www.gnu.org/licenses/>. */ 24 25/* Do code reading to identify a signal frame, and set the frame 26 state data appropriately. See unwind-dw2.c for the structs. 27 Don't use this at all if inhibit_libc is used. */ 28 29#ifndef inhibit_libc 30 31#include <signal.h> 32#include <sys/ucontext.h> 33 34#define MD_FALLBACK_FRAME_STATE_FOR bfin_fallback_frame_state 35 36static _Unwind_Reason_Code 37bfin_fallback_frame_state (struct _Unwind_Context *context, 38 _Unwind_FrameState *fs) 39{ 40 unsigned char *pc = context->ra; 41 struct sigcontext *sc; 42 long new_cfa; 43 44 /* P0=__NR_rt_sigreturn (X); EXCPT 0x0; */ 45 if (*(unsigned short *)pc == 0xe128 46 && *(unsigned short *)(pc + 2) == 0x00ad 47 && *(unsigned short *)(pc + 4) == 0x00a0) 48 { 49 struct rt_sigframe { 50 int sig; 51 siginfo_t *pinfo; 52 void *puc; 53 char retcode[8]; 54 siginfo_t info; 55 ucontext_t uc; 56 } *rt_ = context->cfa; 57 58 /* The void * cast is necessary to avoid an aliasing warning. 59 The aliasing warning is correct, but should not be a problem 60 because it does not alias anything. */ 61 sc = (struct sigcontext *)(void *)&rt_->uc.uc_mcontext.gregs; 62 } 63 else 64 return _URC_END_OF_STACK; 65 66 new_cfa = sc->sc_usp; 67 fs->regs.cfa_how = CFA_REG_OFFSET; 68 fs->regs.cfa_reg = 14; 69 fs->regs.cfa_offset = new_cfa - (long) context->cfa; 70 71 fs->regs.reg[0].how = REG_SAVED_OFFSET; 72 fs->regs.reg[0].loc.offset = (long)&sc->sc_r0 - new_cfa; 73 fs->regs.reg[1].how = REG_SAVED_OFFSET; 74 fs->regs.reg[1].loc.offset = (long)&sc->sc_r1 - new_cfa; 75 fs->regs.reg[2].how = REG_SAVED_OFFSET; 76 fs->regs.reg[2].loc.offset = (long)&sc->sc_r2 - new_cfa; 77 fs->regs.reg[3].how = REG_SAVED_OFFSET; 78 fs->regs.reg[3].loc.offset = (long)&sc->sc_r3 - new_cfa; 79 fs->regs.reg[4].how = REG_SAVED_OFFSET; 80 fs->regs.reg[4].loc.offset = (long)&sc->sc_r4 - new_cfa; 81 fs->regs.reg[5].how = REG_SAVED_OFFSET; 82 fs->regs.reg[5].loc.offset = (long)&sc->sc_r5 - new_cfa; 83 fs->regs.reg[6].how = REG_SAVED_OFFSET; 84 fs->regs.reg[6].loc.offset = (long)&sc->sc_r6 - new_cfa; 85 fs->regs.reg[7].how = REG_SAVED_OFFSET; 86 fs->regs.reg[7].loc.offset = (long)&sc->sc_r7 - new_cfa; 87 fs->regs.reg[8].how = REG_SAVED_OFFSET; 88 fs->regs.reg[8].loc.offset = (long)&sc->sc_p0 - new_cfa; 89 fs->regs.reg[9].how = REG_SAVED_OFFSET; 90 fs->regs.reg[9].loc.offset = (long)&sc->sc_p1 - new_cfa; 91 fs->regs.reg[10].how = REG_SAVED_OFFSET; 92 fs->regs.reg[10].loc.offset = (long)&sc->sc_p2 - new_cfa; 93 fs->regs.reg[11].how = REG_SAVED_OFFSET; 94 fs->regs.reg[11].loc.offset = (long)&sc->sc_p3 - new_cfa; 95 fs->regs.reg[12].how = REG_SAVED_OFFSET; 96 fs->regs.reg[12].loc.offset = (long)&sc->sc_p4 - new_cfa; 97 fs->regs.reg[13].how = REG_SAVED_OFFSET; 98 fs->regs.reg[13].loc.offset = (long)&sc->sc_p5 - new_cfa; 99 100 fs->regs.reg[15].how = REG_SAVED_OFFSET; 101 fs->regs.reg[15].loc.offset = (long)&sc->sc_fp - new_cfa; 102 fs->regs.reg[16].how = REG_SAVED_OFFSET; 103 fs->regs.reg[16].loc.offset = (long)&sc->sc_i0 - new_cfa; 104 fs->regs.reg[17].how = REG_SAVED_OFFSET; 105 fs->regs.reg[17].loc.offset = (long)&sc->sc_i1 - new_cfa; 106 fs->regs.reg[18].how = REG_SAVED_OFFSET; 107 fs->regs.reg[18].loc.offset = (long)&sc->sc_i2 - new_cfa; 108 fs->regs.reg[19].how = REG_SAVED_OFFSET; 109 fs->regs.reg[19].loc.offset = (long)&sc->sc_i3 - new_cfa; 110 fs->regs.reg[20].how = REG_SAVED_OFFSET; 111 fs->regs.reg[20].loc.offset = (long)&sc->sc_b0 - new_cfa; 112 fs->regs.reg[21].how = REG_SAVED_OFFSET; 113 fs->regs.reg[21].loc.offset = (long)&sc->sc_b1 - new_cfa; 114 fs->regs.reg[22].how = REG_SAVED_OFFSET; 115 fs->regs.reg[22].loc.offset = (long)&sc->sc_b2 - new_cfa; 116 fs->regs.reg[23].how = REG_SAVED_OFFSET; 117 fs->regs.reg[23].loc.offset = (long)&sc->sc_b3 - new_cfa; 118 fs->regs.reg[24].how = REG_SAVED_OFFSET; 119 fs->regs.reg[24].loc.offset = (long)&sc->sc_l0 - new_cfa; 120 fs->regs.reg[25].how = REG_SAVED_OFFSET; 121 fs->regs.reg[25].loc.offset = (long)&sc->sc_l1 - new_cfa; 122 fs->regs.reg[26].how = REG_SAVED_OFFSET; 123 fs->regs.reg[26].loc.offset = (long)&sc->sc_l2 - new_cfa; 124 fs->regs.reg[27].how = REG_SAVED_OFFSET; 125 fs->regs.reg[27].loc.offset = (long)&sc->sc_l3 - new_cfa; 126 fs->regs.reg[28].how = REG_SAVED_OFFSET; 127 fs->regs.reg[28].loc.offset = (long)&sc->sc_m0 - new_cfa; 128 fs->regs.reg[29].how = REG_SAVED_OFFSET; 129 fs->regs.reg[29].loc.offset = (long)&sc->sc_m1 - new_cfa; 130 fs->regs.reg[30].how = REG_SAVED_OFFSET; 131 fs->regs.reg[30].loc.offset = (long)&sc->sc_m2 - new_cfa; 132 fs->regs.reg[31].how = REG_SAVED_OFFSET; 133 fs->regs.reg[31].loc.offset = (long)&sc->sc_m3 - new_cfa; 134 /* FIXME: Handle A0, A1, CC. */ 135 fs->regs.reg[35].how = REG_SAVED_OFFSET; 136 fs->regs.reg[35].loc.offset = (long)&sc->sc_rets - new_cfa; 137 fs->regs.reg[36].how = REG_SAVED_OFFSET; 138 fs->regs.reg[36].loc.offset = (long)&sc->sc_pc - new_cfa; 139 fs->regs.reg[37].how = REG_SAVED_OFFSET; 140 fs->regs.reg[37].loc.offset = (long)&sc->sc_retx - new_cfa; 141 142 fs->regs.reg[40].how = REG_SAVED_OFFSET; 143 fs->regs.reg[40].loc.offset = (long)&sc->sc_astat - new_cfa; 144 fs->regs.reg[41].how = REG_SAVED_OFFSET; 145 fs->regs.reg[41].loc.offset = (long)&sc->sc_seqstat - new_cfa; 146 147 fs->regs.reg[44].how = REG_SAVED_OFFSET; 148 fs->regs.reg[44].loc.offset = (long)&sc->sc_lt0 - new_cfa; 149 fs->regs.reg[45].how = REG_SAVED_OFFSET; 150 fs->regs.reg[45].loc.offset = (long)&sc->sc_lt1 - new_cfa; 151 fs->regs.reg[46].how = REG_SAVED_OFFSET; 152 fs->regs.reg[46].loc.offset = (long)&sc->sc_lc0 - new_cfa; 153 fs->regs.reg[47].how = REG_SAVED_OFFSET; 154 fs->regs.reg[47].loc.offset = (long)&sc->sc_lc1 - new_cfa; 155 fs->regs.reg[48].how = REG_SAVED_OFFSET; 156 fs->regs.reg[48].loc.offset = (long)&sc->sc_lb0 - new_cfa; 157 fs->regs.reg[49].how = REG_SAVED_OFFSET; 158 fs->regs.reg[49].loc.offset = (long)&sc->sc_lb1 - new_cfa; 159 fs->retaddr_column = 35; 160 161 return _URC_NO_REASON; 162} 163 164#endif /* ifdef inhibit_libc */ 165