* vaxobsd-tdep.c: New file.
* config/vax/obsd.mt (TDEPFILES): Add vaxobsd-tdep.o. * Makefile.in (vaxobsd-tdep.o): New dependency.
This commit is contained in:
Mark Kettenis
parent
0dbe1904b3
commit
cfaf379b3a
4 changed files with 198 additions and 1 deletions
|
|
@ -1,5 +1,9 @@
|
|||
2005-08-21 Mark Kettenis <kettenis@gnu.org>
|
||||
|
||||
* vaxobsd-tdep.c: New file.
|
||||
* config/vax/obsd.mt (TDEPFILES): Add vaxobsd-tdep.o.
|
||||
* Makefile.in (vaxobsd-tdep.o): New dependency.
|
||||
|
||||
* ppcobsd-tdep.c: Include "frame.h" and "frame-unwind.h". Don't
|
||||
include "tramp-frame.h".
|
||||
(ppcobsd_sigtramp_cache_init): Remove function.
|
||||
|
|
|
|||
|
|
@ -2732,6 +2732,9 @@ vax-nat.o: vax-nat.c $(defs_h) $(inferior_h) $(gdb_assert_h) $(vax_tdep_h) \
|
|||
$(inf_ptrace_h)
|
||||
vaxnbsd-tdep.o: vaxnbsd-tdep.c $(defs_h) $(arch_utils_h) $(osabi_h) \
|
||||
$(vax_tdep_h) $(solib_svr4_h) $(gdb_string_h)
|
||||
vaxobsd-tdep.o: vaxobsd-tdep.c $(defs_h) $(arch_utils_h) $(frame_h) \
|
||||
$(frame_unwind_h) $(osabi_h) $(symtab_h) $(trad_frame_h) \
|
||||
$(vax_tdep_h) $(gdb_string_h)
|
||||
vax-tdep.o: vax-tdep.c $(defs_h) $(arch_utils_h) $(dis_asm_h) $(frame_h) \
|
||||
$(frame_base_h) $(frame_unwind_h) $(gdbcore_h) $(gdbtypes_h) \
|
||||
$(osabi_h) $(regcache_h) $(regset_h) $(trad_frame_h) $(value_h) \
|
||||
|
|
|
|||
|
|
@ -1,2 +1,2 @@
|
|||
# Target: OpenBSD/vax
|
||||
TDEPFILES= vax-tdep.o corelow.o
|
||||
TDEPFILES= vax-tdep.o vaxobsd-tdep.o corelow.o
|
||||
|
|
|
|||
190
gdb/vaxobsd-tdep.c
Normal file
190
gdb/vaxobsd-tdep.c
Normal file
|
|
@ -0,0 +1,190 @@
|
|||
/* Target-dependent code for OpenBSD/vax.
|
||||
|
||||
Copyright 2005 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 "arch-utils.h"
|
||||
#include "frame.h"
|
||||
#include "frame-unwind.h"
|
||||
#include "osabi.h"
|
||||
#include "symtab.h"
|
||||
#include "trad-frame.h"
|
||||
|
||||
#include "vax-tdep.h"
|
||||
|
||||
#include "gdb_string.h"
|
||||
|
||||
/* Signal trampolines. */
|
||||
|
||||
/* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page
|
||||
in virtual memory. The randomness makes it somewhat tricky to
|
||||
detect it, but fortunately we can rely on the fact that the start
|
||||
of the sigtramp routine is page-aligned. We recognize the
|
||||
trampoline by looking for the code that invokes the sigreturn
|
||||
system call. The offset where we can find that code varies from
|
||||
release to release.
|
||||
|
||||
By the way, the mapping mentioned above is read-only, so you cannot
|
||||
place a breakpoint in the signal trampoline. */
|
||||
|
||||
/* Default page size. */
|
||||
static const int vaxobsd_page_size = 4096;
|
||||
|
||||
/* Offset for sigreturn(2). */
|
||||
static const int vaxobsd_sigreturn_offset = 0x11;
|
||||
|
||||
/* Instruction sequence for sigreturn(2). VAX doesn't have
|
||||
fixed-length instructions so we include the ensuing exit(2) to
|
||||
reduce the chance of spurious matches. */
|
||||
static const gdb_byte vaxobsd_sigreturn[] = {
|
||||
0xbc, 0x8f, 0x67, 0x00, /* chmk $SYS_sigreturn */
|
||||
0xbc, 0x01 /* chmk $SYS_exit */
|
||||
};
|
||||
|
||||
static int
|
||||
vaxobsd_sigtramp_p (struct frame_info *next_frame)
|
||||
{
|
||||
CORE_ADDR pc = frame_pc_unwind (next_frame);
|
||||
CORE_ADDR start_pc = (pc & ~(vaxobsd_page_size - 1));
|
||||
CORE_ADDR sigreturn_addr = start_pc + vaxobsd_sigreturn_offset;
|
||||
gdb_byte *buf;
|
||||
char *name;
|
||||
|
||||
find_pc_partial_function (pc, &name, NULL, NULL);
|
||||
if (name)
|
||||
return 0;
|
||||
|
||||
buf = alloca(sizeof vaxobsd_sigreturn);
|
||||
if (!safe_frame_unwind_memory (next_frame, sigreturn_addr,
|
||||
buf, sizeof vaxobsd_sigreturn))
|
||||
return 0;
|
||||
|
||||
if (memcmp(buf, vaxobsd_sigreturn, sizeof vaxobsd_sigreturn) == 0)
|
||||
return 1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct trad_frame_cache *
|
||||
vaxobsd_sigtramp_frame_cache (struct frame_info *next_frame, void **this_cache)
|
||||
{
|
||||
struct trad_frame_cache *cache;
|
||||
CORE_ADDR addr, base, func;
|
||||
|
||||
if (*this_cache)
|
||||
return *this_cache;
|
||||
|
||||
cache = trad_frame_cache_zalloc (next_frame);
|
||||
*this_cache = cache;
|
||||
|
||||
func = frame_pc_unwind (next_frame);
|
||||
func &= ~(vaxobsd_page_size - 1);
|
||||
|
||||
base = frame_unwind_register_unsigned (next_frame, VAX_SP_REGNUM);
|
||||
addr = get_frame_memory_unsigned (next_frame, base - 4, 4);
|
||||
|
||||
trad_frame_set_reg_addr (cache, VAX_SP_REGNUM, addr + 8);
|
||||
trad_frame_set_reg_addr (cache, VAX_FP_REGNUM, addr + 12);
|
||||
trad_frame_set_reg_addr (cache, VAX_AP_REGNUM, addr + 16);
|
||||
trad_frame_set_reg_addr (cache, VAX_PC_REGNUM, addr + 20);
|
||||
trad_frame_set_reg_addr (cache, VAX_PS_REGNUM, addr + 24);
|
||||
|
||||
/* Construct the frame ID using the function start. */
|
||||
trad_frame_set_id (cache, frame_id_build (base, func));
|
||||
|
||||
return cache;
|
||||
}
|
||||
|
||||
static void
|
||||
vaxobsd_sigtramp_frame_this_id (struct frame_info *next_frame,
|
||||
void **this_cache, struct frame_id *this_id)
|
||||
{
|
||||
struct trad_frame_cache *cache =
|
||||
vaxobsd_sigtramp_frame_cache (next_frame, this_cache);
|
||||
|
||||
trad_frame_get_id (cache, this_id);
|
||||
}
|
||||
|
||||
static void
|
||||
vaxobsd_sigtramp_frame_prev_register (struct frame_info *next_frame,
|
||||
void **this_cache, int regnum,
|
||||
int *optimizedp, enum lval_type *lvalp,
|
||||
CORE_ADDR *addrp, int *realnump,
|
||||
gdb_byte *valuep)
|
||||
{
|
||||
struct trad_frame_cache *cache =
|
||||
vaxobsd_sigtramp_frame_cache (next_frame, this_cache);
|
||||
|
||||
trad_frame_get_register (cache, next_frame, regnum,
|
||||
optimizedp, lvalp, addrp, realnump, valuep);
|
||||
}
|
||||
|
||||
static const struct frame_unwind vaxobsd_sigtramp_frame_unwind = {
|
||||
SIGTRAMP_FRAME,
|
||||
vaxobsd_sigtramp_frame_this_id,
|
||||
vaxobsd_sigtramp_frame_prev_register
|
||||
};
|
||||
|
||||
static const struct frame_unwind *
|
||||
vaxobsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
|
||||
{
|
||||
if (vaxobsd_sigtramp_p (next_frame))
|
||||
return &vaxobsd_sigtramp_frame_unwind;
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
|
||||
/* OpenBSD a.out. */
|
||||
|
||||
static void
|
||||
vaxobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
||||
{
|
||||
frame_unwind_append_sniffer (gdbarch, vaxobsd_sigtramp_frame_sniffer);
|
||||
}
|
||||
|
||||
/* FIXME: kettenis/20050821: Since OpenBSD/vax binaries are
|
||||
indistingushable from NetBSD/vax a.out binaries, building a GDB
|
||||
that should support both these targets will probably not work as
|
||||
expected. */
|
||||
#define GDB_OSABI_OPENBSD_AOUT GDB_OSABI_NETBSD_AOUT
|
||||
|
||||
static enum gdb_osabi
|
||||
vaxobsd_aout_osabi_sniffer (bfd *abfd)
|
||||
{
|
||||
if (strcmp (bfd_get_target (abfd), "a.out-vax-netbsd") == 0)
|
||||
return GDB_OSABI_OPENBSD_AOUT;
|
||||
|
||||
return GDB_OSABI_UNKNOWN;
|
||||
}
|
||||
|
||||
|
||||
/* Provide a prototype to silence -Wmissing-prototypes. */
|
||||
void _initialize_vaxobsd_tdep (void);
|
||||
|
||||
void
|
||||
_initialize_vaxobsd_tdep (void)
|
||||
{
|
||||
gdbarch_register_osabi_sniffer (bfd_arch_vax, bfd_target_aout_flavour,
|
||||
vaxobsd_aout_osabi_sniffer);
|
||||
|
||||
gdbarch_register_osabi (bfd_arch_vax, 0, GDB_OSABI_OPENBSD_AOUT,
|
||||
vaxobsd_init_abi);
|
||||
}
|
||||
Loading…
Reference in a new issue