154 lines
4.0 KiB
C
154 lines
4.0 KiB
C
/* DWARF2 EH unwinding support for ARC Linux.
|
|
Copyright (C) 2017-2021 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;
|
|
}
|
|
}
|