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/* Target-dependent code for the IA-64 for GDB, the GNU debugger.
Copyright (C) 2010 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 3 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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "ia64-tdep.h"
#include "ia64-hpux-tdep.h"
#include "osabi.h"
#include "gdbtypes.h"
#include "solib.h"
#include "target.h"
#include "frame.h"
/* The offset to be used in order to get the __reason pseudo-register
when using one of the *UREGS ttrace requests (see system header file
/usr/include/ia64/sys/uregs.h for more details).
The documentation for this pseudo-register says that a nonzero value
indicates that the thread stopped due to a fault, trap, or interrupt.
A null value indicates a stop inside a syscall. */
#define IA64_HPUX_UREG_REASON 0x00070000
/* Return nonzero if the value of the register identified by REGNUM
can be modified. */
static int
ia64_hpux_can_store_ar_register (int regnum)
{
switch (regnum)
{
case IA64_RSC_REGNUM:
case IA64_RNAT_REGNUM:
case IA64_CSD_REGNUM:
case IA64_SSD_REGNUM:
case IA64_CCV_REGNUM:
case IA64_UNAT_REGNUM:
case IA64_FPSR_REGNUM:
case IA64_PFS_REGNUM:
case IA64_LC_REGNUM:
case IA64_EC_REGNUM:
return 1;
break;
default:
return 0;
break;
}
}
/* The "cannot_store_register" target_ops method. */
static int
ia64_hpux_cannot_store_register (struct gdbarch *gdbarch, int regnum)
{
/* General registers. */
if (regnum == IA64_GR0_REGNUM)
return 1;
/* FP register. */
if (regnum == IA64_FR0_REGNUM || regnum == IA64_FR1_REGNUM)
return 1;
/* Application registers. */
if (regnum >= IA64_AR0_REGNUM && regnum <= IA64_AR0_REGNUM + 127)
return (!ia64_hpux_can_store_ar_register (regnum));
/* We can store all other registers. */
return 0;
}
/* Return nonzero if the inferior is stopped inside a system call. */
static int
ia64_hpux_stopped_in_syscall (struct gdbarch *gdbarch)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
struct target_ops *ops = ¤t_target;
gdb_byte buf[8];
int len;
len = target_read (ops, TARGET_OBJECT_HPUX_UREGS, NULL,
buf, IA64_HPUX_UREG_REASON, sizeof (buf));
if (len == -1)
/* The target wasn't able to tell us. Assume we are not stopped
in a system call, which is the normal situation. */
return 0;
gdb_assert (len == 8);
return (extract_unsigned_integer (buf, len, byte_order) == 0);
}
/* The "size_of_register_frame" gdbarch_tdep routine for ia64-hpux. */
static int
ia64_hpux_size_of_register_frame (struct frame_info *this_frame,
ULONGEST cfm)
{
int sof;
if (frame_relative_level (this_frame) == 0
&& ia64_hpux_stopped_in_syscall (get_frame_arch (this_frame)))
/* If the inferior stopped in a system call, the base address
of the register frame is at BSP - SOL instead of BSP - SOF.
This is an HP-UX exception. */
sof = (cfm & 0x3f80) >> 7;
else
sof = (cfm & 0x7f);
return sof;
}
/* Should be set to non-NULL if the ia64-hpux solib module is linked in.
This may not be the case because the shared library support code can
only be compiled on ia64-hpux. */
struct target_so_ops *ia64_hpux_so_ops = NULL;
static void
ia64_hpux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
tdep->size_of_register_frame = ia64_hpux_size_of_register_frame;
set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad);
set_gdbarch_cannot_store_register (gdbarch, ia64_hpux_cannot_store_register);
if (ia64_hpux_so_ops)
set_solib_ops (gdbarch, ia64_hpux_so_ops);
}
/* Provide a prototype to silence -Wmissing-prototypes. */
extern initialize_file_ftype _initialize_ia64_hpux_tdep;
void
_initialize_ia64_hpux_tdep (void)
{
gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_HPUX_ELF,
ia64_hpux_init_abi);
}
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