mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-02 06:43:58 +08:00
5868c862e2
* alpha-tdep.c (alpha_sigcontext_addr): New function. (alpha_find_saved_regs): Use alpha_sigcontext_addr. (alpha_gdbarch_init): Initialize tdep->sigcontext_addr. * alpha-linux-tdep.c: Include frame.h. (alpha_linux_sigcontext_addr): New function. (alpha_linux_init_abi): Set tdep->sigcontext_addr to alpha_linux_sigcontext_addr. * alpha-osf1-tdep.c: Include gdbcore.h. (alpha_osf1_sigcontext_addr): New function. (alpha_osf1_init_abi): Set tdep->sigcontext_addr to alpha_osf1_sigcontext_addr. * config/alpha/tm-alpha.h (SIGCONTEXT_ADDR): Remove. * config/alpha/tm-alphalinux.h (SIGCONTEXT_ADDR): Remove.
121 lines
3.4 KiB
C
121 lines
3.4 KiB
C
/* Target-dependent code for GNU/Linux on Alpha.
|
|
Copyright 2002 Free Software Foundation, Inc.
|
|
|
|
This file is part of GDB.
|
|
|
|
This program 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 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program 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.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include "defs.h"
|
|
#include "frame.h"
|
|
#include "gdbcore.h"
|
|
#include "value.h"
|
|
|
|
#include "alpha-tdep.h"
|
|
|
|
/* Under GNU/Linux, signal handler invocations can be identified by the
|
|
designated code sequence that is used to return from a signal
|
|
handler. In particular, the return address of a signal handler
|
|
points to the following sequence (the first instruction is quadword
|
|
aligned):
|
|
|
|
bis $30,$30,$16
|
|
addq $31,0x67,$0
|
|
call_pal callsys
|
|
|
|
Each instruction has a unique encoding, so we simply attempt to
|
|
match the instruction the pc is pointing to with any of the above
|
|
instructions. If there is a hit, we know the offset to the start
|
|
of the designated sequence and can then check whether we really are
|
|
executing in a designated sequence. If not, -1 is returned,
|
|
otherwise the offset from the start of the desingated sequence is
|
|
returned.
|
|
|
|
There is a slight chance of false hits: code could jump into the
|
|
middle of the designated sequence, in which case there is no
|
|
guarantee that we are in the middle of a sigreturn syscall. Don't
|
|
think this will be a problem in praxis, though. */
|
|
LONGEST
|
|
alpha_linux_sigtramp_offset (CORE_ADDR pc)
|
|
{
|
|
unsigned int i[3], w;
|
|
long off;
|
|
|
|
if (read_memory_nobpt (pc, (char *) &w, 4) != 0)
|
|
return -1;
|
|
|
|
off = -1;
|
|
switch (w)
|
|
{
|
|
case 0x47de0410:
|
|
off = 0;
|
|
break; /* bis $30,$30,$16 */
|
|
case 0x43ecf400:
|
|
off = 4;
|
|
break; /* addq $31,0x67,$0 */
|
|
case 0x00000083:
|
|
off = 8;
|
|
break; /* call_pal callsys */
|
|
default:
|
|
return -1;
|
|
}
|
|
pc -= off;
|
|
if (pc & 0x7)
|
|
{
|
|
/* designated sequence is not quadword aligned */
|
|
return -1;
|
|
}
|
|
if (read_memory_nobpt (pc, (char *) i, sizeof (i)) != 0)
|
|
return -1;
|
|
|
|
if (i[0] == 0x47de0410 && i[1] == 0x43ecf400 && i[2] == 0x00000083)
|
|
return off;
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
alpha_linux_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
|
|
{
|
|
return (alpha_linux_sigtramp_offset (pc) >= 0);
|
|
}
|
|
|
|
static CORE_ADDR
|
|
alpha_linux_sigcontext_addr (struct frame_info *frame)
|
|
{
|
|
return (frame->frame - 0x298); /* sizeof(struct sigcontext) */
|
|
}
|
|
|
|
static void
|
|
alpha_linux_init_abi (struct gdbarch_info info,
|
|
struct gdbarch *gdbarch)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
|
set_gdbarch_pc_in_sigtramp (gdbarch, alpha_linux_pc_in_sigtramp);
|
|
|
|
tdep->dynamic_sigtramp_offset = alpha_linux_sigtramp_offset;
|
|
tdep->sigcontext_addr = alpha_linux_sigcontext_addr;
|
|
|
|
tdep->jb_pc = 2;
|
|
tdep->jb_elt_size = 8;
|
|
}
|
|
|
|
void
|
|
_initialize_alpha_linux_tdep (void)
|
|
{
|
|
alpha_gdbarch_register_os_abi (ALPHA_ABI_LINUX, alpha_linux_init_abi);
|
|
}
|