1 /* Target-dependent code for GNU/Linux on Alpha.
2 Copyright 2002 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program 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 2 of the License, or
9 (at your option) any later version.
11 This program 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.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
24 #include "alpha-tdep.h"
26 /* Under GNU/Linux, signal handler invocations can be identified by the
27 designated code sequence that is used to return from a signal
28 handler. In particular, the return address of a signal handler
29 points to the following sequence (the first instruction is quadword
36 Each instruction has a unique encoding, so we simply attempt to
37 match the instruction the pc is pointing to with any of the above
38 instructions. If there is a hit, we know the offset to the start
39 of the designated sequence and can then check whether we really are
40 executing in a designated sequence. If not, -1 is returned,
41 otherwise the offset from the start of the desingated sequence is
44 There is a slight chance of false hits: code could jump into the
45 middle of the designated sequence, in which case there is no
46 guarantee that we are in the middle of a sigreturn syscall. Don't
47 think this will be a problem in praxis, though. */
49 alpha_linux_sigtramp_offset (CORE_ADDR pc
)
54 if (read_memory_nobpt (pc
, (char *) &w
, 4) != 0)
62 break; /* bis $30,$30,$16 */
65 break; /* addq $31,0x67,$0 */
68 break; /* call_pal callsys */
75 /* designated sequence is not quadword aligned */
78 if (read_memory_nobpt (pc
, (char *) i
, sizeof (i
)) != 0)
81 if (i
[0] == 0x47de0410 && i
[1] == 0x43ecf400 && i
[2] == 0x00000083)
88 alpha_linux_init_abi (struct gdbarch_info info
,
89 struct gdbarch
*gdbarch
)
95 _initialize_alpha_linux_tdep (void)
97 alpha_gdbarch_register_os_abi (ALPHA_ABI_LINUX
, alpha_linux_init_abi
);
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