1234353Sdim/* DWARF2 EH unwinding support for Blackfin. 2193323Sed Copyright (C) 2007-2022 Free Software Foundation, Inc. 3193323Sed 4193323SedThis file is part of GCC. 5193323Sed 6193323SedGCC is free software; you can redistribute it and/or modify 7193323Sedit under the terms of the GNU General Public License as published by 8193323Sedthe Free Software Foundation; either version 3, or (at your option) 9193323Sedany later version. 10193323Sed 11193323SedGCC is distributed in the hope that it will be useful, 12193323Sedbut WITHOUT ANY WARRANTY; without even the implied warranty of 13193323SedMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14234353SdimGNU General Public License for more details. 15193323Sed 16193323SedUnder Section 7 of GPL version 3, you are granted additional 17193323Sedpermissions described in the GCC Runtime Library Exception, version 18193323Sed3.1, as published by the Free Software Foundation. 19193323Sed 20193323SedYou should have received a copy of the GNU General Public License and 21193323Seda copy of the GCC Runtime Library Exception along with this program; 22198090Srdivackysee the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23226633Sdim<http://www.gnu.org/licenses/>. */ 24193323Sed 25224145Sdim/* Do code reading to identify a signal frame, and set the frame 26224145Sdim state data appropriately. See unwind-dw2.c for the structs. 27224145Sdim Don't use this at all if inhibit_libc is used. */ 28193323Sed 29193323Sed#ifndef inhibit_libc 30193323Sed 31224145Sdim#include <signal.h> 32193323Sed#include <sys/ucontext.h> 33193323Sed 34193323Sed#define MD_FALLBACK_FRAME_STATE_FOR bfin_fallback_frame_state 35193323Sed 36193323Sedstatic _Unwind_Reason_Code 37208599Srdivackybfin_fallback_frame_state (struct _Unwind_Context *context, 38208599Srdivacky _Unwind_FrameState *fs) 39206124Srdivacky{ 40193323Sed unsigned char *pc = context->ra; 41199481Srdivacky struct sigcontext *sc; 42199481Srdivacky long new_cfa; 43193323Sed 44199481Srdivacky /* P0=__NR_rt_sigreturn (X); EXCPT 0x0; */ 45234353Sdim if (*(unsigned short *)pc == 0xe128 46218893Sdim && *(unsigned short *)(pc + 2) == 0x00ad 47199481Srdivacky && *(unsigned short *)(pc + 4) == 0x00a0) 48199481Srdivacky { 49199481Srdivacky struct rt_sigframe { 50193323Sed int sig; 51193323Sed siginfo_t *pinfo; 52193323Sed void *puc; 53199481Srdivacky char retcode[8]; 54193323Sed siginfo_t info; 55193323Sed ucontext_t uc; 56193323Sed } *rt_ = context->cfa; 57199481Srdivacky 58193323Sed /* The void * cast is necessary to avoid an aliasing warning. 59198090Srdivacky The aliasing warning is correct, but should not be a problem 60193323Sed because it does not alias anything. */ 61193323Sed sc = (struct sigcontext *)(void *)&rt_->uc.uc_mcontext.gregs; 62193323Sed } 63193323Sed else 64193323Sed return _URC_END_OF_STACK; 65208599Srdivacky 66208599Srdivacky new_cfa = sc->sc_usp; 67206124Srdivacky fs->regs.cfa_how = CFA_REG_OFFSET; 68193323Sed fs->regs.cfa_reg = 14; 69199481Srdivacky fs->regs.cfa_offset = new_cfa - (long) context->cfa; 70199481Srdivacky 71193323Sed fs->regs.reg[0].how = REG_SAVED_OFFSET; 72199481Srdivacky fs->regs.reg[0].loc.offset = (long)&sc->sc_r0 - new_cfa; 73234353Sdim fs->regs.reg[1].how = REG_SAVED_OFFSET; 74218893Sdim fs->regs.reg[1].loc.offset = (long)&sc->sc_r1 - new_cfa; 75199481Srdivacky fs->regs.reg[2].how = REG_SAVED_OFFSET; 76199481Srdivacky fs->regs.reg[2].loc.offset = (long)&sc->sc_r2 - new_cfa; 77199481Srdivacky fs->regs.reg[3].how = REG_SAVED_OFFSET; 78193323Sed fs->regs.reg[3].loc.offset = (long)&sc->sc_r3 - new_cfa; 79193323Sed fs->regs.reg[4].how = REG_SAVED_OFFSET; 80199481Srdivacky fs->regs.reg[4].loc.offset = (long)&sc->sc_r4 - new_cfa; 81193323Sed fs->regs.reg[5].how = REG_SAVED_OFFSET; 82193323Sed fs->regs.reg[5].loc.offset = (long)&sc->sc_r5 - new_cfa; 83199481Srdivacky fs->regs.reg[6].how = REG_SAVED_OFFSET; 84193323Sed fs->regs.reg[6].loc.offset = (long)&sc->sc_r6 - new_cfa; 85198090Srdivacky fs->regs.reg[7].how = REG_SAVED_OFFSET; 86193323Sed fs->regs.reg[7].loc.offset = (long)&sc->sc_r7 - new_cfa; 87193323Sed fs->regs.reg[8].how = REG_SAVED_OFFSET; 88210299Sed fs->regs.reg[8].loc.offset = (long)&sc->sc_p0 - new_cfa; 89210299Sed fs->regs.reg[9].how = REG_SAVED_OFFSET; 90210299Sed fs->regs.reg[9].loc.offset = (long)&sc->sc_p1 - new_cfa; 91210299Sed fs->regs.reg[10].how = REG_SAVED_OFFSET; 92210299Sed fs->regs.reg[10].loc.offset = (long)&sc->sc_p2 - new_cfa; 93210299Sed fs->regs.reg[11].how = REG_SAVED_OFFSET; 94210299Sed fs->regs.reg[11].loc.offset = (long)&sc->sc_p3 - new_cfa; 95210299Sed fs->regs.reg[12].how = REG_SAVED_OFFSET; 96210299Sed fs->regs.reg[12].loc.offset = (long)&sc->sc_p4 - new_cfa; 97210299Sed fs->regs.reg[13].how = REG_SAVED_OFFSET; 98210299Sed fs->regs.reg[13].loc.offset = (long)&sc->sc_p5 - new_cfa; 99193323Sed 100210299Sed fs->regs.reg[15].how = REG_SAVED_OFFSET; 101210299Sed fs->regs.reg[15].loc.offset = (long)&sc->sc_fp - new_cfa; 102193323Sed fs->regs.reg[16].how = REG_SAVED_OFFSET; 103193323Sed fs->regs.reg[16].loc.offset = (long)&sc->sc_i0 - new_cfa; 104198396Srdivacky fs->regs.reg[17].how = REG_SAVED_OFFSET; 105198396Srdivacky fs->regs.reg[17].loc.offset = (long)&sc->sc_i1 - new_cfa; 106198396Srdivacky fs->regs.reg[18].how = REG_SAVED_OFFSET; 107198396Srdivacky fs->regs.reg[18].loc.offset = (long)&sc->sc_i2 - new_cfa; 108198396Srdivacky fs->regs.reg[19].how = REG_SAVED_OFFSET; 109198396Srdivacky fs->regs.reg[19].loc.offset = (long)&sc->sc_i3 - new_cfa; 110206083Srdivacky fs->regs.reg[20].how = REG_SAVED_OFFSET; 111206083Srdivacky fs->regs.reg[20].loc.offset = (long)&sc->sc_b0 - new_cfa; 112198396Srdivacky fs->regs.reg[21].how = REG_SAVED_OFFSET; 113207618Srdivacky fs->regs.reg[21].loc.offset = (long)&sc->sc_b1 - new_cfa; 114207618Srdivacky fs->regs.reg[22].how = REG_SAVED_OFFSET; 115207618Srdivacky fs->regs.reg[22].loc.offset = (long)&sc->sc_b2 - new_cfa; 116198396Srdivacky fs->regs.reg[23].how = REG_SAVED_OFFSET; 117198396Srdivacky fs->regs.reg[23].loc.offset = (long)&sc->sc_b3 - new_cfa; 118198396Srdivacky fs->regs.reg[24].how = REG_SAVED_OFFSET; 119198396Srdivacky fs->regs.reg[24].loc.offset = (long)&sc->sc_l0 - new_cfa; 120198396Srdivacky fs->regs.reg[25].how = REG_SAVED_OFFSET; 121198396Srdivacky fs->regs.reg[25].loc.offset = (long)&sc->sc_l1 - new_cfa; 122198396Srdivacky fs->regs.reg[26].how = REG_SAVED_OFFSET; 123198396Srdivacky fs->regs.reg[26].loc.offset = (long)&sc->sc_l2 - new_cfa; 124198396Srdivacky fs->regs.reg[27].how = REG_SAVED_OFFSET; 125198396Srdivacky fs->regs.reg[27].loc.offset = (long)&sc->sc_l3 - new_cfa; 126198396Srdivacky fs->regs.reg[28].how = REG_SAVED_OFFSET; 127198396Srdivacky fs->regs.reg[28].loc.offset = (long)&sc->sc_m0 - new_cfa; 128198396Srdivacky fs->regs.reg[29].how = REG_SAVED_OFFSET; 129198396Srdivacky fs->regs.reg[29].loc.offset = (long)&sc->sc_m1 - new_cfa; 130198396Srdivacky fs->regs.reg[30].how = REG_SAVED_OFFSET; 131198396Srdivacky fs->regs.reg[30].loc.offset = (long)&sc->sc_m2 - new_cfa; 132198396Srdivacky fs->regs.reg[31].how = REG_SAVED_OFFSET; 133234353Sdim fs->regs.reg[31].loc.offset = (long)&sc->sc_m3 - new_cfa; 134198396Srdivacky /* FIXME: Handle A0, A1, CC. */ 135198396Srdivacky fs->regs.reg[35].how = REG_SAVED_OFFSET; 136198396Srdivacky fs->regs.reg[35].loc.offset = (long)&sc->sc_rets - new_cfa; 137198396Srdivacky fs->regs.reg[36].how = REG_SAVED_OFFSET; 138198396Srdivacky fs->regs.reg[36].loc.offset = (long)&sc->sc_pc - new_cfa; 139198396Srdivacky fs->regs.reg[37].how = REG_SAVED_OFFSET; 140198396Srdivacky fs->regs.reg[37].loc.offset = (long)&sc->sc_retx - new_cfa; 141198396Srdivacky 142198396Srdivacky fs->regs.reg[40].how = REG_SAVED_OFFSET; 143198396Srdivacky fs->regs.reg[40].loc.offset = (long)&sc->sc_astat - new_cfa; 144198396Srdivacky fs->regs.reg[41].how = REG_SAVED_OFFSET; 145198396Srdivacky fs->regs.reg[41].loc.offset = (long)&sc->sc_seqstat - new_cfa; 146198396Srdivacky 147198396Srdivacky fs->regs.reg[44].how = REG_SAVED_OFFSET; 148198396Srdivacky fs->regs.reg[44].loc.offset = (long)&sc->sc_lt0 - new_cfa; 149198396Srdivacky fs->regs.reg[45].how = REG_SAVED_OFFSET; 150198396Srdivacky fs->regs.reg[45].loc.offset = (long)&sc->sc_lt1 - new_cfa; 151198396Srdivacky fs->regs.reg[46].how = REG_SAVED_OFFSET; 152198396Srdivacky fs->regs.reg[46].loc.offset = (long)&sc->sc_lc0 - new_cfa; 153198396Srdivacky fs->regs.reg[47].how = REG_SAVED_OFFSET; 154198396Srdivacky fs->regs.reg[47].loc.offset = (long)&sc->sc_lc1 - new_cfa; 155198396Srdivacky fs->regs.reg[48].how = REG_SAVED_OFFSET; 156198396Srdivacky fs->regs.reg[48].loc.offset = (long)&sc->sc_lb0 - new_cfa; 157198396Srdivacky fs->regs.reg[49].how = REG_SAVED_OFFSET; 158198396Srdivacky fs->regs.reg[49].loc.offset = (long)&sc->sc_lb1 - new_cfa; 159234353Sdim fs->retaddr_column = 35; 160198396Srdivacky 161198396Srdivacky return _URC_NO_REASON; 162234353Sdim} 163198396Srdivacky 164234353Sdim#endif /* ifdef inhibit_libc */ 165198396Srdivacky