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/* DWARF2 EH unwinding support for TILEPro.
Copyright (C) 2011-2021 Free Software Foundation, Inc.
Contributed by Walter Lee (walt@tilera.com)
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/>. */
#ifndef inhibit_libc
#include <arch/abi.h>
#include <signal.h>
#include <sys/ucontext.h>
#include <linux/unistd.h>
/* Macro to define a copy of the kernel's __rt_sigreturn function
(in arch/tile/kernel/entry.S). If that function is changed,
this one needs to be changed to match it. */
#define _sigreturn_asm(REG, NR) asm( \
".pushsection .text.__rt_sigreturn,\"a\"\n" \
".global __rt_sigreturn\n" \
".type __rt_sigreturn,@function\n" \
"__rt_sigreturn:\n" \
"moveli " #REG ", " #NR "\n" \
"swint1\n" \
".size __rt_sigreturn, . - __rt_sigreturn\n" \
".popsection")
#define sigreturn_asm(REG, NR) _sigreturn_asm(REG, NR)
sigreturn_asm (TREG_SYSCALL_NR_NAME, __NR_rt_sigreturn);
#define SIGRETURN_LEN 16
extern char __rt_sigreturn[];
#define MD_FALLBACK_FRAME_STATE_FOR tile_fallback_frame_state
static _Unwind_Reason_Code
tile_fallback_frame_state (struct _Unwind_Context *context,
_Unwind_FrameState *fs)
{
unsigned char *pc = context->ra;
struct sigcontext *sc;
long new_cfa;
int i;
struct rt_sigframe {
unsigned char save_area[C_ABI_SAVE_AREA_SIZE];
siginfo_t info;
ucontext_t uc;
} *rt_;
/* Return if this is not a signal handler. */
if (memcmp (pc, __rt_sigreturn, SIGRETURN_LEN) != 0)
return _URC_END_OF_STACK;
/* It was a signal handler; update the reported PC to point to our
copy, since that will be findable with dladdr() and therefore
somewhat easier to help understand what actually happened. */
context->ra = __rt_sigreturn;
rt_ = context->cfa;
sc = &rt_->uc.uc_mcontext;
new_cfa = sc->sp;
fs->regs.cfa_how = CFA_REG_OFFSET;
fs->regs.cfa_reg = __LIBGCC_STACK_POINTER_REGNUM__;
fs->regs.cfa_offset = new_cfa - (long) context->cfa;
for (i = 0; i < 56; ++i)
{
fs->regs.reg[i].how = REG_SAVED_OFFSET;
fs->regs.reg[i].loc.offset
= (long)&sc->gregs[i] - new_cfa;
}
fs->regs.reg[56].how = REG_SAVED_OFFSET;
fs->regs.reg[56].loc.offset = (long)&sc->pc - new_cfa;
fs->retaddr_column = 56;
fs->signal_frame = 1;
return _URC_NO_REASON;
}
#endif /* ifdef inhibit_libc */
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