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/* DWARF2 EH unwinding support for Blackfin. Copyright (C) 2007, 2009 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; struct siginfo *pinfo; void *puc; char retcode[8]; struct siginfo info; struct ucontext 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 */