mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-09 04:21:49 +08:00
8513dd2d37
(alphanbsd-nat.o): Remove dependency list. (alphanbsd-tdep.o): Add $(regcache_h) to dependency list. * alphanbsd-nat.c: Delete. Contents moved to... * alphanbsd-tdep.c: ...here. (_initialize_alphanbsd_tdep): Register core functions. * config/alpha/nbsd.mh (NATDEPFILES): Remove alphanbsd-nat.o.
252 lines
6.7 KiB
C
252 lines
6.7 KiB
C
/* Target-dependent code for NetBSD/Alpha.
|
|
Copyright 2002 Free Software Foundation, Inc.
|
|
Contributed by Wasabi Systems, 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 "gdbcore.h"
|
|
#include "regcache.h"
|
|
#include "value.h"
|
|
#include "solib-svr4.h"
|
|
|
|
#include "alpha-tdep.h"
|
|
#include "alphabsd-tdep.h"
|
|
|
|
static void
|
|
fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
|
|
CORE_ADDR ignore)
|
|
{
|
|
char *regs, *fpregs;
|
|
int regno;
|
|
|
|
/* Table to map a gdb register number to a trapframe register index. */
|
|
static const int regmap[] =
|
|
{
|
|
0, 1, 2, 3,
|
|
4, 5, 6, 7,
|
|
8, 9, 10, 11,
|
|
12, 13, 14, 15,
|
|
30, 31, 32, 16,
|
|
17, 18, 19, 20,
|
|
21, 22, 23, 24,
|
|
25, 29, 26
|
|
};
|
|
#define SIZEOF_TRAPFRAME (33 * 8)
|
|
|
|
/* We get everything from one section. */
|
|
if (which != 0)
|
|
return;
|
|
|
|
regs = core_reg_sect;
|
|
fpregs = core_reg_sect + SIZEOF_TRAPFRAME;
|
|
|
|
if (core_reg_size < (SIZEOF_TRAPFRAME + SIZEOF_STRUCT_FPREG))
|
|
{
|
|
warning ("Wrong size register set in core file.");
|
|
return;
|
|
}
|
|
|
|
/* Integer registers. */
|
|
for (regno = 0; regno < ALPHA_ZERO_REGNUM; regno++)
|
|
supply_register (regno, regs + (regmap[regno] * 8));
|
|
supply_register (ALPHA_ZERO_REGNUM, NULL);
|
|
supply_register (FP_REGNUM, NULL);
|
|
supply_register (PC_REGNUM, regs + (28 * 8));
|
|
|
|
/* Floating point registers. */
|
|
alphabsd_supply_fpreg (fpregs, -1);
|
|
}
|
|
|
|
static void
|
|
fetch_elfcore_registers (char *core_reg_sect, unsigned core_reg_size, int which,
|
|
CORE_ADDR ignore)
|
|
{
|
|
switch (which)
|
|
{
|
|
case 0: /* Integer registers. */
|
|
if (core_reg_size != SIZEOF_STRUCT_REG)
|
|
warning ("Wrong size register set in core file.");
|
|
else
|
|
alphabsd_supply_reg (core_reg_sect, -1);
|
|
break;
|
|
|
|
case 2: /* Floating point registers. */
|
|
if (core_reg_size != SIZEOF_STRUCT_FPREG)
|
|
warning ("Wrong size FP register set in core file.");
|
|
else
|
|
alphabsd_supply_fpreg (core_reg_sect, -1);
|
|
break;
|
|
|
|
default:
|
|
/* Don't know what kind of register request this is; just ignore it. */
|
|
break;
|
|
}
|
|
}
|
|
|
|
static struct core_fns alphanbsd_core_fns =
|
|
{
|
|
bfd_target_unknown_flavour, /* core_flavour */
|
|
default_check_format, /* check_format */
|
|
default_core_sniffer, /* core_sniffer */
|
|
fetch_core_registers, /* core_read_registers */
|
|
NULL /* next */
|
|
};
|
|
|
|
static struct core_fns alphanbsd_elfcore_fns =
|
|
{
|
|
bfd_target_elf_flavour, /* core_flavour */
|
|
default_check_format, /* check_format */
|
|
default_core_sniffer, /* core_sniffer */
|
|
fetch_elfcore_registers, /* core_read_registers */
|
|
NULL /* next */
|
|
};
|
|
|
|
/* Fetch (and possibly build) an appropriate link_map_offsets
|
|
structure for NetBSD/alpha targets using the struct offsets
|
|
defined in <link.h> (but without actual reference to that file).
|
|
|
|
This makes it possible to access NetBSD/alpha shared libraries
|
|
from a GDB that was not built on a NetBSD/alpha host (for cross
|
|
debugging). */
|
|
|
|
static struct link_map_offsets *
|
|
alphanbsd_solib_svr4_fetch_link_map_offsets (void)
|
|
{
|
|
static struct link_map_offsets lmo;
|
|
static struct link_map_offsets *lmp = NULL;
|
|
|
|
if (lmp == NULL)
|
|
{
|
|
lmp = &lmo;
|
|
|
|
lmo.r_debug_size = 32;
|
|
|
|
lmo.r_map_offset = 8;
|
|
lmo.r_map_size = 8;
|
|
|
|
lmo.link_map_size = 40;
|
|
|
|
lmo.l_addr_offset = 0;
|
|
lmo.l_addr_size = 8;
|
|
|
|
lmo.l_name_offset = 8;
|
|
lmo.l_name_size = 8;
|
|
|
|
lmo.l_next_offset = 24;
|
|
lmo.l_next_size = 8;
|
|
|
|
lmo.l_prev_offset = 32;
|
|
lmo.l_prev_size = 8;
|
|
}
|
|
|
|
return lmp;
|
|
}
|
|
|
|
/* Under NetBSD/alpha, 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 code sequence:
|
|
|
|
ldq a0, 0(sp)
|
|
lda sp, 16(sp)
|
|
lda v0, 295(zero) # __sigreturn14
|
|
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 the
|
|
signal trampoline. If not, -1 is returned, otherwise the offset from the
|
|
start of the return sequence is returned. */
|
|
static const unsigned int sigtramp_retcode[] =
|
|
{
|
|
0xa61e0000, /* ldq a0, 0(sp) */
|
|
0x23de0010, /* lda sp, 16(sp) */
|
|
0x201f0127, /* lda v0, 295(zero) */
|
|
0x00000083, /* call_pal callsys */
|
|
};
|
|
#define RETCODE_NWORDS \
|
|
(sizeof (sigtramp_retcode) / sizeof (sigtramp_retcode[0]))
|
|
|
|
LONGEST
|
|
alphanbsd_sigtramp_offset (CORE_ADDR pc)
|
|
{
|
|
unsigned int ret[4], w;
|
|
LONGEST off;
|
|
int i;
|
|
|
|
if (read_memory_nobpt (pc, (char *) &w, 4) != 0)
|
|
return -1;
|
|
|
|
for (i = 0; i < RETCODE_NWORDS; i++)
|
|
{
|
|
if (w == sigtramp_retcode[i])
|
|
break;
|
|
}
|
|
if (i == RETCODE_NWORDS)
|
|
return (-1);
|
|
|
|
off = i * 4;
|
|
pc -= off;
|
|
|
|
if (read_memory_nobpt (pc, (char *) ret, sizeof (ret)) != 0)
|
|
return -1;
|
|
|
|
if (memcmp (ret, sigtramp_retcode, sizeof (sigtramp_retcode)) == 0)
|
|
return off;
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
alphanbsd_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
|
|
{
|
|
return (alphanbsd_sigtramp_offset (pc) >= 0);
|
|
}
|
|
|
|
static void
|
|
alphanbsd_init_abi (struct gdbarch_info info,
|
|
struct gdbarch *gdbarch)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
|
set_gdbarch_pc_in_sigtramp (gdbarch, alphanbsd_pc_in_sigtramp);
|
|
|
|
/* NetBSD/alpha does not provide single step support via ptrace(2); we
|
|
must use software single-stepping. */
|
|
set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
|
|
|
|
set_solib_svr4_fetch_link_map_offsets (gdbarch,
|
|
alphanbsd_solib_svr4_fetch_link_map_offsets);
|
|
|
|
tdep->dynamic_sigtramp_offset = alphanbsd_sigtramp_offset;
|
|
|
|
tdep->jb_pc = 2;
|
|
tdep->jb_elt_size = 8;
|
|
}
|
|
|
|
void
|
|
_initialize_alphanbsd_tdep (void)
|
|
{
|
|
alpha_gdbarch_register_os_abi (ALPHA_ABI_NETBSD, alphanbsd_init_abi);
|
|
|
|
add_core_fns (&alphanbsd_core_fns);
|
|
add_core_fns (&alphanbsd_elfcore_fns);
|
|
}
|