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Diffstat (limited to 'libgcc/config/arc/linux-unwind.h')
| -rw-r--r-- | libgcc/config/arc/linux-unwind.h | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/libgcc/config/arc/linux-unwind.h b/libgcc/config/arc/linux-unwind.h new file mode 100644 index 00000000000..136c9b7ed03 --- /dev/null +++ b/libgcc/config/arc/linux-unwind.h @@ -0,0 +1,153 @@ +/* DWARF2 EH unwinding support for ARC Linux. + Copyright (C) 2017 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/>. */ + +/* This order is defined by a structure in the kernel, in file + arch/arc/kernel/signal.c. */ + +#define REGISTER_IN_STACK(REG_NAME, ID) \ + REG_NAME, +enum registers_stack_order { + REGISTER_STACK_ORDER_START = -1, + #include "config/arc/linux-unwind-reg.def" + REGISTER_STACK_ORDER_SIZE, +}; + +struct register_position { + int reg_id; + int offset_in_stack; +}; +#undef REGISTER_IN_STACK + +#define REGISTER_SIZE_IN_WORDS 4 +#define REGISTER_IN_STACK(REG_NAME, ID) (int) ID, +int +register_id_for_index[REGISTER_STACK_ORDER_SIZE] = { + #include "config/arc/linux-unwind-reg.def" +}; +#undef REGISTER_IN_STACK + +#ifndef inhibit_libc +/* Do code reading to identify a signal frame, and set the frame + state data appropriately. See unwind-dw2.c for the structs. */ + +#include <signal.h> +#include <asm/unistd.h> + +/* +00010edc <__default_rt_sa_restorer>: + 10edc: 208a 12c2 mov r8,139 + 10ee0: 781e trap_s 0 + 10ee2: 7ee0 j_s [blink] +*/ + +#if __BIG_ENDIAN__ +#define MOV_R8_139 0x8a20c212 +#define TRAP_S_J_S_BLINK 0x1e78e07e +#define SWI 0x6f223f00 +#elif __LITTLE_ENDIAN__ +#define MOV_R8_139 0x12c2208a +#define TRAP_S_J_S_BLINK 0x7ee0781e +#define SWI 0x003f226f +#endif + +#define MD_FALLBACK_FRAME_STATE_FOR arc_fallback_frame_state + +static __attribute__((noinline)) _Unwind_Reason_Code +arc_fallback_frame_state (struct _Unwind_Context *context, + _Unwind_FrameState *fs) +{ + struct rt_sigframe { + siginfo_t info; + ucontext_t uc; + unsigned int sigret_magic; + }; + + struct rt_sigframe *rt_; + u_int32_t *pc = (u_int32_t *) context->ra; + struct sigcontext *sc; + _Unwind_Ptr new_cfa; + int i; + +#ifdef __ARC700__ + if (pc[1] != SWI) + return _URC_END_OF_STACK; +#else + if (pc[1] != TRAP_S_J_S_BLINK) + return _URC_END_OF_STACK; +#endif + + if (pc[0] == MOV_R8_139) + { + rt_ = context->cfa; + sc = &rt_->uc.uc_mcontext; + } + else + return _URC_END_OF_STACK; + + new_cfa = (_Unwind_Ptr) sc; + fs->regs.cfa_how = CFA_REG_OFFSET; + fs->regs.cfa_reg = __LIBGCC_STACK_POINTER_REGNUM__; + fs->regs.cfa_offset = new_cfa - (_Unwind_Ptr) context->cfa; + + unsigned long *regs = &sc->regs.scratch.bta; + for (i = 0; i < REGISTER_STACK_ORDER_SIZE; i++) + { + if (register_id_for_index[i] == -1) + continue; + fs->regs.reg[register_id_for_index[i]].how = REG_SAVED_OFFSET; + fs->regs.reg[register_id_for_index[i]].loc.offset + = ((_Unwind_Ptr) &(regs[i])) - new_cfa; + } + + fs->regs.reg[31].how = REG_SAVED_VAL_OFFSET; + fs->regs.reg[31].loc.offset = ((_Unwind_Ptr) (regs[ret])) - new_cfa; + + fs->retaddr_column = 31; + + return _URC_NO_REASON; +} +#endif + +#define MD_FROB_UPDATE_CONTEXT arc_frob_update_context +/* Save fp register for unwinding to work. */ + +static void +arc_frob_update_context (struct _Unwind_Context *context, + _Unwind_FrameState *fs) +{ + _Unwind_Word fp_val; + asm ("mov %0,fp" : "=r" (fp_val)); + + switch (fs->regs.reg[27].how) + { + case REG_UNSAVED: + case REG_UNDEFINED: + if (context->reg[27] == NULL) + _Unwind_SetGRValue (context, 27, fp_val); + break; + + default: + break; + } +} |