70f80edf7c
(COMMON_OBS): Add osabi.o. (osabi.o): New dependency list. * osabi.c: New file. * osabi.h: New file. * doc/gdbint.texinfo: Document new generic OS ABI framework. * Makefile.in (alpha_tdep_h): Define and use instead of alpha-tdep.h. * alpha-tdep.c (alpha_abi_names, process_note_abi_tag_sections, get_elfosabi, alpha_abi_handler_list, alpha_gdbarch_register_os_abi): Remove. (alpha_gdbarch_init, alpha_dump_tdep): Use generic OS ABI framework. * alpha-tdep.h: Include osabi.h. (alpha_abi): Remove. (gdbarch_tdep): Use generic OS ABI framework. * alpha-linux-tdep.c (_initialize_alpha_linux_tdep): Use gdbarch_register_osabi. * alpha-osf1-tdep.c (_initialize_alpha_osf1_tdep): Likewise. * alphafbsd-tdep.c (_initialize_alphafbsd_tdep): Likewise. * alphanbsd-tdep.c (_initialize_alphanbsd_tdep): Likewise. * Makefile.in (sh_tdep_h): Add osabi.h. * sh-tdep.h (sh_osabi): Remove. (gdbarch_tdep): Use generic OS ABI framework. * sh-tdep.c (sh_osabi_names, process_note_abi_tag_sections, sh_osabi_handler_list, sh_gdbarch_register_os_abi): Remove. (sh_gdbarch_init, sh_dump_tdep): Use generic OS ABI framework. * shnbsd-tdep.c (_initialize_shnbsd_tdep): Use gdbarch_register_osabi. * Makefile.in (arm_tdep_h): Define and use instead of arm-tdep.h. * arm-linux-tdep.c (_initialize_arm_linux_tdep): Use gdbarch_register_osabi. * arm-tdep.c (arm_abi_names, process_note_abi_tag_sections, arm_abi_handler_list, arm_gdbarch_register_os_abi): Remove. (get_elfosabi): Rename to... (arm_elf_osabi_sniffer): ...this. Adjust to use generic OS ABI framework support routines. (arm_gdbarch_init): Use generic OS ABI framework. (arm_dump_tdep): Likewise. (_initialize_arm_tdep): Likewise. * arm-tdep.h: Include osabi.h. (arm_abi): Remove. (gdbarch_tdep): Remove arm_abi and abi_name members. Add osabi member. (arm_gdbarch_register_os_abi): Remove prototype. * armnbsd-tdep.c (arm_netbsd_aout_osabi_sniffer): New function. (_initialize_arm_netbsd_tdep): Use gdbarch_register_osabi. * Makefile.in (mips-tdep.o): Add osabi.h to dependency list. * mips-tdep.c: Include osabi.h. (gdbarch_tdep, mips_gdbarch_init, mips_dump_tdep): Use generic OS ABI framework.
121 lines
3.5 KiB
C
121 lines
3.5 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)
|
|
{
|
|
gdbarch_register_osabi (bfd_arch_alpha, GDB_OSABI_LINUX,
|
|
alpha_linux_init_abi);
|
|
}
|