1 /* DWARF2 EH unwinding support for Blackfin. 2 Copyright (C) 2007-2013 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3, or (at your option) 9 any later version. 10 11 GCC is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 Under Section 7 of GPL version 3, you are granted additional 17 permissions described in the GCC Runtime Library Exception, version 18 3.1, as published by the Free Software Foundation. 19 20 You should have received a copy of the GNU General Public License and 21 a copy of the GCC Runtime Library Exception along with this program; 22 see 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 36 static _Unwind_Reason_Code 37 bfin_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 struct ucontext 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