| /* DWARF2 EH unwinding support for Blackfin. |
| Copyright (C) 2007-2021 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3, or (at your option) |
| any later version. |
| |
| GCC is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| Under Section 7 of GPL version 3, you are granted additional |
| permissions described in the GCC Runtime Library Exception, version |
| 3.1, as published by the Free Software Foundation. |
| |
| You should have received a copy of the GNU General Public License and |
| a copy of the GCC Runtime Library Exception along with this program; |
| see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* Do code reading to identify a signal frame, and set the frame |
| state data appropriately. See unwind-dw2.c for the structs. |
| Don't use this at all if inhibit_libc is used. */ |
| |
| #ifndef inhibit_libc |
| |
| #include <signal.h> |
| #include <sys/ucontext.h> |
| |
| #define MD_FALLBACK_FRAME_STATE_FOR bfin_fallback_frame_state |
| |
| static _Unwind_Reason_Code |
| bfin_fallback_frame_state (struct _Unwind_Context *context, |
| _Unwind_FrameState *fs) |
| { |
| unsigned char *pc = context->ra; |
| struct sigcontext *sc; |
| long new_cfa; |
| |
| /* P0=__NR_rt_sigreturn (X); EXCPT 0x0; */ |
| if (*(unsigned short *)pc == 0xe128 |
| && *(unsigned short *)(pc + 2) == 0x00ad |
| && *(unsigned short *)(pc + 4) == 0x00a0) |
| { |
| struct rt_sigframe { |
| int sig; |
| siginfo_t *pinfo; |
| void *puc; |
| char retcode[8]; |
| siginfo_t info; |
| ucontext_t uc; |
| } *rt_ = context->cfa; |
| |
| /* The void * cast is necessary to avoid an aliasing warning. |
| The aliasing warning is correct, but should not be a problem |
| because it does not alias anything. */ |
| sc = (struct sigcontext *)(void *)&rt_->uc.uc_mcontext.gregs; |
| } |
| else |
| return _URC_END_OF_STACK; |
| |
| new_cfa = sc->sc_usp; |
| fs->regs.cfa_how = CFA_REG_OFFSET; |
| fs->regs.cfa_reg = 14; |
| fs->regs.cfa_offset = new_cfa - (long) context->cfa; |
| |
| fs->regs.reg[0].how = REG_SAVED_OFFSET; |
| fs->regs.reg[0].loc.offset = (long)&sc->sc_r0 - new_cfa; |
| fs->regs.reg[1].how = REG_SAVED_OFFSET; |
| fs->regs.reg[1].loc.offset = (long)&sc->sc_r1 - new_cfa; |
| fs->regs.reg[2].how = REG_SAVED_OFFSET; |
| fs->regs.reg[2].loc.offset = (long)&sc->sc_r2 - new_cfa; |
| fs->regs.reg[3].how = REG_SAVED_OFFSET; |
| fs->regs.reg[3].loc.offset = (long)&sc->sc_r3 - new_cfa; |
| fs->regs.reg[4].how = REG_SAVED_OFFSET; |
| fs->regs.reg[4].loc.offset = (long)&sc->sc_r4 - new_cfa; |
| fs->regs.reg[5].how = REG_SAVED_OFFSET; |
| fs->regs.reg[5].loc.offset = (long)&sc->sc_r5 - new_cfa; |
| fs->regs.reg[6].how = REG_SAVED_OFFSET; |
| fs->regs.reg[6].loc.offset = (long)&sc->sc_r6 - new_cfa; |
| fs->regs.reg[7].how = REG_SAVED_OFFSET; |
| fs->regs.reg[7].loc.offset = (long)&sc->sc_r7 - new_cfa; |
| fs->regs.reg[8].how = REG_SAVED_OFFSET; |
| fs->regs.reg[8].loc.offset = (long)&sc->sc_p0 - new_cfa; |
| fs->regs.reg[9].how = REG_SAVED_OFFSET; |
| fs->regs.reg[9].loc.offset = (long)&sc->sc_p1 - new_cfa; |
| fs->regs.reg[10].how = REG_SAVED_OFFSET; |
| fs->regs.reg[10].loc.offset = (long)&sc->sc_p2 - new_cfa; |
| fs->regs.reg[11].how = REG_SAVED_OFFSET; |
| fs->regs.reg[11].loc.offset = (long)&sc->sc_p3 - new_cfa; |
| fs->regs.reg[12].how = REG_SAVED_OFFSET; |
| fs->regs.reg[12].loc.offset = (long)&sc->sc_p4 - new_cfa; |
| fs->regs.reg[13].how = REG_SAVED_OFFSET; |
| fs->regs.reg[13].loc.offset = (long)&sc->sc_p5 - new_cfa; |
| |
| fs->regs.reg[15].how = REG_SAVED_OFFSET; |
| fs->regs.reg[15].loc.offset = (long)&sc->sc_fp - new_cfa; |
| fs->regs.reg[16].how = REG_SAVED_OFFSET; |
| fs->regs.reg[16].loc.offset = (long)&sc->sc_i0 - new_cfa; |
| fs->regs.reg[17].how = REG_SAVED_OFFSET; |
| fs->regs.reg[17].loc.offset = (long)&sc->sc_i1 - new_cfa; |
| fs->regs.reg[18].how = REG_SAVED_OFFSET; |
| fs->regs.reg[18].loc.offset = (long)&sc->sc_i2 - new_cfa; |
| fs->regs.reg[19].how = REG_SAVED_OFFSET; |
| fs->regs.reg[19].loc.offset = (long)&sc->sc_i3 - new_cfa; |
| fs->regs.reg[20].how = REG_SAVED_OFFSET; |
| fs->regs.reg[20].loc.offset = (long)&sc->sc_b0 - new_cfa; |
| fs->regs.reg[21].how = REG_SAVED_OFFSET; |
| fs->regs.reg[21].loc.offset = (long)&sc->sc_b1 - new_cfa; |
| fs->regs.reg[22].how = REG_SAVED_OFFSET; |
| fs->regs.reg[22].loc.offset = (long)&sc->sc_b2 - new_cfa; |
| fs->regs.reg[23].how = REG_SAVED_OFFSET; |
| fs->regs.reg[23].loc.offset = (long)&sc->sc_b3 - new_cfa; |
| fs->regs.reg[24].how = REG_SAVED_OFFSET; |
| fs->regs.reg[24].loc.offset = (long)&sc->sc_l0 - new_cfa; |
| fs->regs.reg[25].how = REG_SAVED_OFFSET; |
| fs->regs.reg[25].loc.offset = (long)&sc->sc_l1 - new_cfa; |
| fs->regs.reg[26].how = REG_SAVED_OFFSET; |
| fs->regs.reg[26].loc.offset = (long)&sc->sc_l2 - new_cfa; |
| fs->regs.reg[27].how = REG_SAVED_OFFSET; |
| fs->regs.reg[27].loc.offset = (long)&sc->sc_l3 - new_cfa; |
| fs->regs.reg[28].how = REG_SAVED_OFFSET; |
| fs->regs.reg[28].loc.offset = (long)&sc->sc_m0 - new_cfa; |
| fs->regs.reg[29].how = REG_SAVED_OFFSET; |
| fs->regs.reg[29].loc.offset = (long)&sc->sc_m1 - new_cfa; |
| fs->regs.reg[30].how = REG_SAVED_OFFSET; |
| fs->regs.reg[30].loc.offset = (long)&sc->sc_m2 - new_cfa; |
| fs->regs.reg[31].how = REG_SAVED_OFFSET; |
| fs->regs.reg[31].loc.offset = (long)&sc->sc_m3 - new_cfa; |
| /* FIXME: Handle A0, A1, CC. */ |
| fs->regs.reg[35].how = REG_SAVED_OFFSET; |
| fs->regs.reg[35].loc.offset = (long)&sc->sc_rets - new_cfa; |
| fs->regs.reg[36].how = REG_SAVED_OFFSET; |
| fs->regs.reg[36].loc.offset = (long)&sc->sc_pc - new_cfa; |
| fs->regs.reg[37].how = REG_SAVED_OFFSET; |
| fs->regs.reg[37].loc.offset = (long)&sc->sc_retx - new_cfa; |
| |
| fs->regs.reg[40].how = REG_SAVED_OFFSET; |
| fs->regs.reg[40].loc.offset = (long)&sc->sc_astat - new_cfa; |
| fs->regs.reg[41].how = REG_SAVED_OFFSET; |
| fs->regs.reg[41].loc.offset = (long)&sc->sc_seqstat - new_cfa; |
| |
| fs->regs.reg[44].how = REG_SAVED_OFFSET; |
| fs->regs.reg[44].loc.offset = (long)&sc->sc_lt0 - new_cfa; |
| fs->regs.reg[45].how = REG_SAVED_OFFSET; |
| fs->regs.reg[45].loc.offset = (long)&sc->sc_lt1 - new_cfa; |
| fs->regs.reg[46].how = REG_SAVED_OFFSET; |
| fs->regs.reg[46].loc.offset = (long)&sc->sc_lc0 - new_cfa; |
| fs->regs.reg[47].how = REG_SAVED_OFFSET; |
| fs->regs.reg[47].loc.offset = (long)&sc->sc_lc1 - new_cfa; |
| fs->regs.reg[48].how = REG_SAVED_OFFSET; |
| fs->regs.reg[48].loc.offset = (long)&sc->sc_lb0 - new_cfa; |
| fs->regs.reg[49].how = REG_SAVED_OFFSET; |
| fs->regs.reg[49].loc.offset = (long)&sc->sc_lb1 - new_cfa; |
| fs->retaddr_column = 35; |
| |
| return _URC_NO_REASON; |
| } |
| |
| #endif /* ifdef inhibit_libc */ |