| 1 |
282 |
jeremybenn |
/* DWARF2 EH unwinding support for Alpha Linux.
|
| 2 |
|
|
Copyright (C) 2004, 2005, 2009 Free Software Foundation, Inc.
|
| 3 |
|
|
|
| 4 |
|
|
This file is part of GCC.
|
| 5 |
|
|
|
| 6 |
|
|
GCC is free software; you can redistribute it and/or modify
|
| 7 |
|
|
it under the terms of the GNU General Public License as published by
|
| 8 |
|
|
the Free Software Foundation; either version 3, or (at your option)
|
| 9 |
|
|
any later version.
|
| 10 |
|
|
|
| 11 |
|
|
GCC is distributed in the hope that it will be useful,
|
| 12 |
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 13 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
| 14 |
|
|
GNU General Public License for more details.
|
| 15 |
|
|
|
| 16 |
|
|
Under Section 7 of GPL version 3, you are granted additional
|
| 17 |
|
|
permissions described in the GCC Runtime Library Exception, version
|
| 18 |
|
|
3.1, as published by the Free Software Foundation.
|
| 19 |
|
|
|
| 20 |
|
|
You should have received a copy of the GNU General Public License and
|
| 21 |
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
| 22 |
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
| 23 |
|
|
<http://www.gnu.org/licenses/>. */
|
| 24 |
|
|
|
| 25 |
|
|
/* Do code reading to identify a signal frame, and set the frame
|
| 26 |
|
|
state data appropriately. See unwind-dw2.c for the structs. */
|
| 27 |
|
|
|
| 28 |
|
|
#include <signal.h>
|
| 29 |
|
|
#include <sys/ucontext.h>
|
| 30 |
|
|
|
| 31 |
|
|
#define MD_FALLBACK_FRAME_STATE_FOR alpha_fallback_frame_state
|
| 32 |
|
|
|
| 33 |
|
|
static _Unwind_Reason_Code
|
| 34 |
|
|
alpha_fallback_frame_state (struct _Unwind_Context *context,
|
| 35 |
|
|
_Unwind_FrameState *fs)
|
| 36 |
|
|
{
|
| 37 |
|
|
unsigned int *pc = context->ra;
|
| 38 |
|
|
struct sigcontext *sc;
|
| 39 |
|
|
long new_cfa, i;
|
| 40 |
|
|
|
| 41 |
|
|
if (pc[0] != 0x47fe0410 /* mov $30,$16 */
|
| 42 |
|
|
|| pc[2] != 0x00000083 /* callsys */)
|
| 43 |
|
|
return _URC_END_OF_STACK;
|
| 44 |
|
|
if (context->cfa == 0)
|
| 45 |
|
|
return _URC_END_OF_STACK;
|
| 46 |
|
|
if (pc[1] == 0x201f0067) /* lda $0,NR_sigreturn */
|
| 47 |
|
|
sc = context->cfa;
|
| 48 |
|
|
else if (pc[1] == 0x201f015f) /* lda $0,NR_rt_sigreturn */
|
| 49 |
|
|
{
|
| 50 |
|
|
struct rt_sigframe {
|
| 51 |
|
|
struct siginfo info;
|
| 52 |
|
|
struct ucontext uc;
|
| 53 |
|
|
} *rt_ = context->cfa;
|
| 54 |
|
|
sc = &rt_->uc.uc_mcontext;
|
| 55 |
|
|
}
|
| 56 |
|
|
else
|
| 57 |
|
|
return _URC_END_OF_STACK;
|
| 58 |
|
|
new_cfa = sc->sc_regs[30];
|
| 59 |
|
|
fs->regs.cfa_how = CFA_REG_OFFSET;
|
| 60 |
|
|
fs->regs.cfa_reg = 30;
|
| 61 |
|
|
fs->regs.cfa_offset = new_cfa - (long) context->cfa;
|
| 62 |
|
|
for (i = 0; i < 30; ++i)
|
| 63 |
|
|
{
|
| 64 |
|
|
fs->regs.reg[i].how = REG_SAVED_OFFSET;
|
| 65 |
|
|
fs->regs.reg[i].loc.offset
|
| 66 |
|
|
= (long)&sc->sc_regs[i] - new_cfa;
|
| 67 |
|
|
}
|
| 68 |
|
|
for (i = 0; i < 31; ++i)
|
| 69 |
|
|
{
|
| 70 |
|
|
fs->regs.reg[i+32].how = REG_SAVED_OFFSET;
|
| 71 |
|
|
fs->regs.reg[i+32].loc.offset
|
| 72 |
|
|
= (long)&sc->sc_fpregs[i] - new_cfa;
|
| 73 |
|
|
}
|
| 74 |
|
|
fs->regs.reg[64].how = REG_SAVED_OFFSET;
|
| 75 |
|
|
fs->regs.reg[64].loc.offset = (long)&sc->sc_pc - new_cfa;
|
| 76 |
|
|
fs->retaddr_column = 64;
|
| 77 |
|
|
return _URC_NO_REASON;
|
| 78 |
|
|
}
|
