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/* C6X EABI compliant unwinding routines.
Copyright (C) 2011-2022 Free Software Foundation, Inc.
This file 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.
This file 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/>. */
#include "unwind.h"
/* Misc constants. */
#define NUM_SAVED_REGS 32
#define R_B0 16
#define R_B3 (R_B0 + 3)
#define R_B15 (R_B0 + 15)
#define R_SP R_B15
#define R_LR R_B3
#define R_PC 33
#define VRS_PC(vrs) ((vrs)->core.pc)
#define VRS_SP(vrs) ((vrs)->core.reg[R_SP])
#define VRS_RETURN(vrs) ((vrs)->core.reg[R_B3])
struct core_regs
{
_uw reg[NUM_SAVED_REGS];
_uw pc;
};
typedef struct
{
/* The first fields must be the same as a phase2_vrs. */
_uw demand_save_flags; /* Currently always zero. */
struct core_regs core;
_uw prev_sp; /* Only valid during forced unwinding. */
} phase1_vrs;
/* This must match the structure created by the assembly wrappers. */
typedef struct
{
_uw demand_save_flags;
struct core_regs core;
} phase2_vrs;
/* Coprocessor register state manipulation functions. */
/* Restore coprocessor state after phase1 unwinding. */
static void
restore_non_core_regs (phase1_vrs * vrs __attribute__((unused)))
{
}
#include "unwind-arm-common.inc"
/* ABI defined personality routines. */
extern _Unwind_Reason_Code __c6xabi_unwind_cpp_pr0 (_Unwind_State,
_Unwind_Control_Block *, _Unwind_Context *);// __attribute__((weak));
extern _Unwind_Reason_Code __c6xabi_unwind_cpp_pr1 (_Unwind_State,
_Unwind_Control_Block *, _Unwind_Context *) __attribute__((weak));
extern _Unwind_Reason_Code __c6xabi_unwind_cpp_pr2 (_Unwind_State,
_Unwind_Control_Block *, _Unwind_Context *) __attribute__((weak));
extern _Unwind_Reason_Code __c6xabi_unwind_cpp_pr3 (_Unwind_State,
_Unwind_Control_Block *, _Unwind_Context *) __attribute__((weak));
extern _Unwind_Reason_Code __c6xabi_unwind_cpp_pr4 (_Unwind_State,
_Unwind_Control_Block *, _Unwind_Context *) __attribute__((weak));
/* ABI defined routine to store a virtual register to memory. */
_Unwind_VRS_Result _Unwind_VRS_Get (_Unwind_Context *context,
_Unwind_VRS_RegClass regclass,
_uw regno,
_Unwind_VRS_DataRepresentation representation,
void *valuep)
{
phase1_vrs *vrs = (phase1_vrs *) context;
switch (regclass)
{
case _UVRSC_CORE:
if (representation != _UVRSD_UINT32)
return _UVRSR_FAILED;
if (regno == R_PC)
{
*(_uw *) valuep = vrs->core.pc;
return _UVRSR_OK;
}
if (regno >= NUM_SAVED_REGS)
return _UVRSR_FAILED;
*(_uw *) valuep = vrs->core.reg[regno];
return _UVRSR_OK;
default:
return _UVRSR_FAILED;
}
}
/* ABI defined function to load a virtual register from memory. */
_Unwind_VRS_Result _Unwind_VRS_Set (_Unwind_Context *context,
_Unwind_VRS_RegClass regclass,
_uw regno,
_Unwind_VRS_DataRepresentation representation,
void *valuep)
{
phase1_vrs *vrs = (phase1_vrs *) context;
switch (regclass)
{
case _UVRSC_CORE:
if (representation != _UVRSD_UINT32)
return _UVRSR_FAILED;
if (regno == R_PC)
{
vrs->core.pc = *(_uw *) valuep;
return _UVRSR_OK;
}
if (regno >= NUM_SAVED_REGS)
return _UVRSR_FAILED;
vrs->core.reg[regno] = *(_uw *) valuep;
return _UVRSR_OK;
default:
return _UVRSR_FAILED;
}
}
/* Core unwinding functions. */
/* Calculate the address encoded by a 31-bit self-relative offset at address
P. */
static inline _uw
selfrel_offset31 (const _uw *p)
{
_uw offset;
offset = *p << 1;
return offset + (_uw) p;
}
static _uw
__gnu_unwind_get_pr_addr (int idx)
{
switch (idx)
{
case 0:
return (_uw) &__c6xabi_unwind_cpp_pr0;
case 1:
return (_uw) &__c6xabi_unwind_cpp_pr1;
case 2:
return (_uw) &__c6xabi_unwind_cpp_pr2;
case 3:
return (_uw) &__c6xabi_unwind_cpp_pr3;
case 4:
return (_uw) &__c6xabi_unwind_cpp_pr4;
default:
return 0;
}
}
/* ABI defined personality routine entry points. */
_Unwind_Reason_Code
__c6xabi_unwind_cpp_pr0 (_Unwind_State state,
_Unwind_Control_Block *ucbp,
_Unwind_Context *context)
{
return __gnu_unwind_pr_common (state, ucbp, context, 0);
}
_Unwind_Reason_Code
__c6xabi_unwind_cpp_pr1 (_Unwind_State state,
_Unwind_Control_Block *ucbp,
_Unwind_Context *context)
{
return __gnu_unwind_pr_common (state, ucbp, context, 1);
}
_Unwind_Reason_Code
__c6xabi_unwind_cpp_pr2 (_Unwind_State state,
_Unwind_Control_Block *ucbp,
_Unwind_Context *context)
{
return __gnu_unwind_pr_common (state, ucbp, context, 2);
}
_Unwind_Reason_Code
__c6xabi_unwind_cpp_pr3 (_Unwind_State state,
_Unwind_Control_Block *ucbp,
_Unwind_Context *context)
{
return __gnu_unwind_pr_common (state, ucbp, context, 3);
}
_Unwind_Reason_Code
__c6xabi_unwind_cpp_pr4 (_Unwind_State state,
_Unwind_Control_Block *ucbp,
_Unwind_Context *context)
{
return __gnu_unwind_pr_common (state, ucbp, context, 4);
}