1*63d1a8abSmrg /* DWARF2 EH unwinding support for SH Linux. 2*63d1a8abSmrg Copyright (C) 2004-2017 Free Software Foundation, Inc. 3*63d1a8abSmrg 4*63d1a8abSmrg This file is part of GCC. 5*63d1a8abSmrg 6*63d1a8abSmrg GCC is free software; you can redistribute it and/or modify 7*63d1a8abSmrg it under the terms of the GNU General Public License as published by 8*63d1a8abSmrg the Free Software Foundation; either version 3, or (at your option) 9*63d1a8abSmrg any later version. 10*63d1a8abSmrg 11*63d1a8abSmrg GCC is distributed in the hope that it will be useful, 12*63d1a8abSmrg but WITHOUT ANY WARRANTY; without even the implied warranty of 13*63d1a8abSmrg MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*63d1a8abSmrg GNU General Public License for more details. 15*63d1a8abSmrg 16*63d1a8abSmrg Under Section 7 of GPL version 3, you are granted additional 17*63d1a8abSmrg permissions described in the GCC Runtime Library Exception, version 18*63d1a8abSmrg 3.1, as published by the Free Software Foundation. 19*63d1a8abSmrg 20*63d1a8abSmrg You should have received a copy of the GNU General Public License and 21*63d1a8abSmrg a copy of the GCC Runtime Library Exception along with this program; 22*63d1a8abSmrg see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23*63d1a8abSmrg <http://www.gnu.org/licenses/>. */ 24*63d1a8abSmrg 25*63d1a8abSmrg 26*63d1a8abSmrg /* Do code reading to identify a signal frame, and set the frame 27*63d1a8abSmrg state data appropriately. See unwind-dw2.c for the structs. 28*63d1a8abSmrg Don't use this at all if inhibit_libc is used. */ 29*63d1a8abSmrg 30*63d1a8abSmrg #ifndef inhibit_libc 31*63d1a8abSmrg 32*63d1a8abSmrg #include <signal.h> 33*63d1a8abSmrg #include <sys/ucontext.h> 34*63d1a8abSmrg #include "insn-constants.h" 35*63d1a8abSmrg 36*63d1a8abSmrg #define SH_DWARF_FRAME_GP0 0 37*63d1a8abSmrg #define SH_DWARF_FRAME_FP0 25 38*63d1a8abSmrg #define SH_DWARF_FRAME_XD0 87 39*63d1a8abSmrg #define SH_DWARF_FRAME_PR 17 40*63d1a8abSmrg #define SH_DWARF_FRAME_GBR 18 41*63d1a8abSmrg #define SH_DWARF_FRAME_MACH 20 42*63d1a8abSmrg #define SH_DWARF_FRAME_MACL 21 43*63d1a8abSmrg #define SH_DWARF_FRAME_PC 16 44*63d1a8abSmrg #define SH_DWARF_FRAME_SR 22 45*63d1a8abSmrg #define SH_DWARF_FRAME_FPUL 23 46*63d1a8abSmrg #define SH_DWARF_FRAME_FPSCR 24 47*63d1a8abSmrg 48*63d1a8abSmrg #define MD_FALLBACK_FRAME_STATE_FOR sh_fallback_frame_state 49*63d1a8abSmrg 50*63d1a8abSmrg static _Unwind_Reason_Code 51*63d1a8abSmrg sh_fallback_frame_state (struct _Unwind_Context *context, 52*63d1a8abSmrg _Unwind_FrameState *fs) 53*63d1a8abSmrg { 54*63d1a8abSmrg unsigned char *pc = context->ra; 55*63d1a8abSmrg struct sigcontext *sc; 56*63d1a8abSmrg long new_cfa; 57*63d1a8abSmrg int i; 58*63d1a8abSmrg #if defined (__SH3E__) || defined (__SH4__) 59*63d1a8abSmrg int r; 60*63d1a8abSmrg #endif 61*63d1a8abSmrg 62*63d1a8abSmrg /* mov.w 1f,r3; trapa #0x10; 1: .short 0x77 (sigreturn) */ 63*63d1a8abSmrg /* mov.w 1f,r3; trapa #0x10; 1: .short 0xad (rt_sigreturn) */ 64*63d1a8abSmrg /* Newer kernel uses pad instructions to avoid an SH-4 core bug. */ 65*63d1a8abSmrg /* mov.w 1f,r3; trapa #0x10; or r0,r0; or r0,r0; or r0,r0; or r0,r0; 66*63d1a8abSmrg or r0,r0; 1: .short 0x77 (sigreturn) */ 67*63d1a8abSmrg /* mov.w 1f,r3; trapa #0x10; or r0,r0; or r0,r0; or r0,r0; or r0,r0; 68*63d1a8abSmrg or r0,r0; 1: .short 0xad (rt_sigreturn) */ 69*63d1a8abSmrg if (((*(unsigned short *) (pc+0) == 0x9300) 70*63d1a8abSmrg && (*(unsigned short *) (pc+2) == 0xc310) 71*63d1a8abSmrg && (*(unsigned short *) (pc+4) == 0x0077)) 72*63d1a8abSmrg || (((*(unsigned short *) (pc+0) == 0x9305) 73*63d1a8abSmrg && (*(unsigned short *) (pc+2) == 0xc310) 74*63d1a8abSmrg && (*(unsigned short *) (pc+14) == 0x0077)))) 75*63d1a8abSmrg sc = context->cfa; 76*63d1a8abSmrg else if (((*(unsigned short *) (pc+0) == 0x9300) 77*63d1a8abSmrg && (*(unsigned short *) (pc+2) == 0xc310) 78*63d1a8abSmrg && (*(unsigned short *) (pc+4) == 0x00ad)) 79*63d1a8abSmrg || (((*(unsigned short *) (pc+0) == 0x9305) 80*63d1a8abSmrg && (*(unsigned short *) (pc+2) == 0xc310) 81*63d1a8abSmrg && (*(unsigned short *) (pc+14) == 0x00ad)))) 82*63d1a8abSmrg { 83*63d1a8abSmrg struct rt_sigframe { 84*63d1a8abSmrg siginfo_t info; 85*63d1a8abSmrg ucontext_t uc; 86*63d1a8abSmrg } *rt_ = context->cfa; 87*63d1a8abSmrg /* The void * cast is necessary to avoid an aliasing warning. 88*63d1a8abSmrg The aliasing warning is correct, but should not be a problem 89*63d1a8abSmrg because it does not alias anything. */ 90*63d1a8abSmrg sc = (struct sigcontext *) (void *) &rt_->uc.uc_mcontext; 91*63d1a8abSmrg } 92*63d1a8abSmrg else 93*63d1a8abSmrg return _URC_END_OF_STACK; 94*63d1a8abSmrg 95*63d1a8abSmrg new_cfa = sc->sc_regs[15]; 96*63d1a8abSmrg fs->regs.cfa_how = CFA_REG_OFFSET; 97*63d1a8abSmrg fs->regs.cfa_reg = 15; 98*63d1a8abSmrg fs->regs.cfa_offset = new_cfa - (long) context->cfa; 99*63d1a8abSmrg 100*63d1a8abSmrg for (i = 0; i < 15; i++) 101*63d1a8abSmrg { 102*63d1a8abSmrg fs->regs.reg[i].how = REG_SAVED_OFFSET; 103*63d1a8abSmrg fs->regs.reg[i].loc.offset 104*63d1a8abSmrg = (long)&(sc->sc_regs[i]) - new_cfa; 105*63d1a8abSmrg } 106*63d1a8abSmrg 107*63d1a8abSmrg fs->regs.reg[SH_DWARF_FRAME_PR].how = REG_SAVED_OFFSET; 108*63d1a8abSmrg fs->regs.reg[SH_DWARF_FRAME_PR].loc.offset 109*63d1a8abSmrg = (long)&(sc->sc_pr) - new_cfa; 110*63d1a8abSmrg fs->regs.reg[SH_DWARF_FRAME_SR].how = REG_SAVED_OFFSET; 111*63d1a8abSmrg fs->regs.reg[SH_DWARF_FRAME_SR].loc.offset 112*63d1a8abSmrg = (long)&(sc->sc_sr) - new_cfa; 113*63d1a8abSmrg fs->regs.reg[SH_DWARF_FRAME_GBR].how = REG_SAVED_OFFSET; 114*63d1a8abSmrg fs->regs.reg[SH_DWARF_FRAME_GBR].loc.offset 115*63d1a8abSmrg = (long)&(sc->sc_gbr) - new_cfa; 116*63d1a8abSmrg fs->regs.reg[SH_DWARF_FRAME_MACH].how = REG_SAVED_OFFSET; 117*63d1a8abSmrg fs->regs.reg[SH_DWARF_FRAME_MACH].loc.offset 118*63d1a8abSmrg = (long)&(sc->sc_mach) - new_cfa; 119*63d1a8abSmrg fs->regs.reg[SH_DWARF_FRAME_MACL].how = REG_SAVED_OFFSET; 120*63d1a8abSmrg fs->regs.reg[SH_DWARF_FRAME_MACL].loc.offset 121*63d1a8abSmrg = (long)&(sc->sc_macl) - new_cfa; 122*63d1a8abSmrg 123*63d1a8abSmrg #if defined (__SH3E__) || defined (__SH4__) 124*63d1a8abSmrg r = SH_DWARF_FRAME_FP0; 125*63d1a8abSmrg for (i = 0; i < 16; i++) 126*63d1a8abSmrg { 127*63d1a8abSmrg fs->regs.reg[r+i].how = REG_SAVED_OFFSET; 128*63d1a8abSmrg fs->regs.reg[r+i].loc.offset 129*63d1a8abSmrg = (long)&(sc->sc_fpregs[i]) - new_cfa; 130*63d1a8abSmrg } 131*63d1a8abSmrg 132*63d1a8abSmrg r = SH_DWARF_FRAME_XD0; 133*63d1a8abSmrg for (i = 0; i < 8; i++) 134*63d1a8abSmrg { 135*63d1a8abSmrg fs->regs.reg[r+i].how = REG_SAVED_OFFSET; 136*63d1a8abSmrg fs->regs.reg[r+i].loc.offset 137*63d1a8abSmrg = (long)&(sc->sc_xfpregs[2*i]) - new_cfa; 138*63d1a8abSmrg } 139*63d1a8abSmrg 140*63d1a8abSmrg fs->regs.reg[SH_DWARF_FRAME_FPUL].how = REG_SAVED_OFFSET; 141*63d1a8abSmrg fs->regs.reg[SH_DWARF_FRAME_FPUL].loc.offset 142*63d1a8abSmrg = (long)&(sc->sc_fpul) - new_cfa; 143*63d1a8abSmrg fs->regs.reg[SH_DWARF_FRAME_FPSCR].how = REG_SAVED_OFFSET; 144*63d1a8abSmrg fs->regs.reg[SH_DWARF_FRAME_FPSCR].loc.offset 145*63d1a8abSmrg = (long)&(sc->sc_fpscr) - new_cfa; 146*63d1a8abSmrg #endif 147*63d1a8abSmrg 148*63d1a8abSmrg fs->regs.reg[SH_DWARF_FRAME_PC].how = REG_SAVED_OFFSET; 149*63d1a8abSmrg fs->regs.reg[SH_DWARF_FRAME_PC].loc.offset 150*63d1a8abSmrg = (long)&(sc->sc_pc) - new_cfa; 151*63d1a8abSmrg fs->retaddr_column = SH_DWARF_FRAME_PC; 152*63d1a8abSmrg fs->signal_frame = 1; 153*63d1a8abSmrg return _URC_NO_REASON; 154*63d1a8abSmrg } 155*63d1a8abSmrg 156*63d1a8abSmrg #endif /* inhibit_libc */ 157