2011-09-13 14:48:33 +02:00
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/* C6X EABI compliant unwinding routines.
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2018-01-03 11:03:58 +01:00
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Copyright (C) 2011-2018 Free Software Foundation, Inc.
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2011-09-13 14:48:33 +02:00
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This file is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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This file is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "unwind.h"
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/* Misc constants. */
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#define NUM_SAVED_REGS 32
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#define R_B0 16
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#define R_B3 (R_B0 + 3)
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#define R_B15 (R_B0 + 15)
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#define R_SP R_B15
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#define R_LR R_B3
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#define R_PC 33
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#define VRS_PC(vrs) ((vrs)->core.pc)
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#define VRS_SP(vrs) ((vrs)->core.reg[R_SP])
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#define VRS_RETURN(vrs) ((vrs)->core.reg[R_B3])
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struct core_regs
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{
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_uw reg[NUM_SAVED_REGS];
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_uw pc;
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};
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typedef struct
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{
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/* The first fields must be the same as a phase2_vrs. */
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_uw demand_save_flags; /* Currently always zero. */
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struct core_regs core;
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_uw prev_sp; /* Only valid during forced unwinding. */
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} phase1_vrs;
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/* This must match the structure created by the assembly wrappers. */
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typedef struct
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{
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_uw demand_save_flags;
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struct core_regs core;
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} phase2_vrs;
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/* Coprocessor register state manipulation functions. */
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/* Restore coprocessor state after phase1 unwinding. */
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static void
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restore_non_core_regs (phase1_vrs * vrs __attribute__((unused)))
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{
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}
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#include "unwind-arm-common.inc"
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/* ABI defined personality routines. */
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extern _Unwind_Reason_Code __c6xabi_unwind_cpp_pr0 (_Unwind_State,
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_Unwind_Control_Block *, _Unwind_Context *);// __attribute__((weak));
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extern _Unwind_Reason_Code __c6xabi_unwind_cpp_pr1 (_Unwind_State,
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_Unwind_Control_Block *, _Unwind_Context *) __attribute__((weak));
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extern _Unwind_Reason_Code __c6xabi_unwind_cpp_pr2 (_Unwind_State,
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_Unwind_Control_Block *, _Unwind_Context *) __attribute__((weak));
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extern _Unwind_Reason_Code __c6xabi_unwind_cpp_pr3 (_Unwind_State,
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_Unwind_Control_Block *, _Unwind_Context *) __attribute__((weak));
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extern _Unwind_Reason_Code __c6xabi_unwind_cpp_pr4 (_Unwind_State,
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_Unwind_Control_Block *, _Unwind_Context *) __attribute__((weak));
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/* ABI defined routine to store a virtual register to memory. */
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_Unwind_VRS_Result _Unwind_VRS_Get (_Unwind_Context *context,
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_Unwind_VRS_RegClass regclass,
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_uw regno,
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_Unwind_VRS_DataRepresentation representation,
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void *valuep)
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{
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phase1_vrs *vrs = (phase1_vrs *) context;
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switch (regclass)
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{
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case _UVRSC_CORE:
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if (representation != _UVRSD_UINT32)
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return _UVRSR_FAILED;
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if (regno == R_PC)
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{
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*(_uw *) valuep = vrs->core.pc;
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return _UVRSR_OK;
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}
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if (regno >= NUM_SAVED_REGS)
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return _UVRSR_FAILED;
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*(_uw *) valuep = vrs->core.reg[regno];
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return _UVRSR_OK;
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default:
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return _UVRSR_FAILED;
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}
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}
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/* ABI defined function to load a virtual register from memory. */
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_Unwind_VRS_Result _Unwind_VRS_Set (_Unwind_Context *context,
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_Unwind_VRS_RegClass regclass,
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_uw regno,
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_Unwind_VRS_DataRepresentation representation,
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void *valuep)
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{
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phase1_vrs *vrs = (phase1_vrs *) context;
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switch (regclass)
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{
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case _UVRSC_CORE:
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if (representation != _UVRSD_UINT32)
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return _UVRSR_FAILED;
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if (regno == R_PC)
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{
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vrs->core.pc = *(_uw *) valuep;
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return _UVRSR_OK;
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}
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if (regno >= NUM_SAVED_REGS)
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return _UVRSR_FAILED;
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vrs->core.reg[regno] = *(_uw *) valuep;
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return _UVRSR_OK;
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default:
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return _UVRSR_FAILED;
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}
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}
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/* Core unwinding functions. */
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/* Calculate the address encoded by a 31-bit self-relative offset at address
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P. */
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static inline _uw
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selfrel_offset31 (const _uw *p)
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{
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_uw offset;
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offset = *p << 1;
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return offset + (_uw) p;
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}
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static _uw
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__gnu_unwind_get_pr_addr (int idx)
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{
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switch (idx)
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{
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case 0:
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return (_uw) &__c6xabi_unwind_cpp_pr0;
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case 1:
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return (_uw) &__c6xabi_unwind_cpp_pr1;
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case 2:
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return (_uw) &__c6xabi_unwind_cpp_pr2;
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case 3:
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return (_uw) &__c6xabi_unwind_cpp_pr3;
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case 4:
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return (_uw) &__c6xabi_unwind_cpp_pr4;
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default:
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return 0;
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}
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}
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/* ABI defined personality routine entry points. */
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_Unwind_Reason_Code
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__c6xabi_unwind_cpp_pr0 (_Unwind_State state,
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_Unwind_Control_Block *ucbp,
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_Unwind_Context *context)
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{
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return __gnu_unwind_pr_common (state, ucbp, context, 0);
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}
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_Unwind_Reason_Code
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__c6xabi_unwind_cpp_pr1 (_Unwind_State state,
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_Unwind_Control_Block *ucbp,
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_Unwind_Context *context)
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{
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return __gnu_unwind_pr_common (state, ucbp, context, 1);
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}
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_Unwind_Reason_Code
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__c6xabi_unwind_cpp_pr2 (_Unwind_State state,
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_Unwind_Control_Block *ucbp,
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_Unwind_Context *context)
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{
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return __gnu_unwind_pr_common (state, ucbp, context, 2);
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}
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_Unwind_Reason_Code
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__c6xabi_unwind_cpp_pr3 (_Unwind_State state,
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_Unwind_Control_Block *ucbp,
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_Unwind_Context *context)
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{
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return __gnu_unwind_pr_common (state, ucbp, context, 3);
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}
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_Unwind_Reason_Code
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__c6xabi_unwind_cpp_pr4 (_Unwind_State state,
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_Unwind_Control_Block *ucbp,
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_Unwind_Context *context)
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{
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return __gnu_unwind_pr_common (state, ucbp, context, 4);
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}
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