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/* Target-dependent code for NetBSD/amd64.

   Copyright (C) 2003, 2004, 2007, 2008 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 "arch-utils.h"

#include "frame.h"

#include "gdbcore.h"

#include "osabi.h"

#include "symtab.h"

#include "gdb_assert.h"

#include "amd64-tdep.h"

#include "nbsd-tdep.h"

#include "solib-svr4.h"

/* Support for signal handlers.  */

/* Return whether the frame preceding NEXT_FRAME corresponds to a

   NetBSD sigtramp routine.  */

static int

amd64nbsd_sigtramp_p (struct frame_info *next_frame)

{

  CORE_ADDR pc = frame_pc_unwind (next_frame);

  char *name;

  find_pc_partial_function (pc, &name, NULL, NULL);

  return nbsd_pc_in_sigtramp (pc, name);

}

/* Assuming NEXT_FRAME is preceded by a frame corresponding to a

   NetBSD sigtramp routine, return the address of the associated

   mcontext structure.  */

static CORE_ADDR

amd64nbsd_mcontext_addr (struct frame_info *next_frame)

{

  CORE_ADDR addr;

  /* The register %r15 points at `struct ucontext' upon entry of a

     signal trampoline.  */

  addr = frame_unwind_register_unsigned (next_frame, AMD64_R15_REGNUM);

  /* The mcontext structure lives as offset 56 in `struct ucontext'.  */

  return addr + 56;

}

/* NetBSD 2.0 or later.  */

/* Mapping between the general-purpose registers in `struct reg'

   format and GDB's register cache layout.  */

/* From <machine/reg.h>.  */

int amd64nbsd_r_reg_offset[] =

{

  14 * 8,                       /* %rax */

  13 * 8,                       /* %rbx */

  3 * 8,                        /* %rcx */

  2 * 8,                        /* %rdx */

  1 * 8,                        /* %rsi */

  12 * 8,                       /* %rbp */

  24 * 8,                       /* %rsp */

  4 * 8,                        /* %r8 .. */

  5 * 8,

  6 * 8,

  7 * 8,

  8 * 8,

  9 * 8,

  10 * 8,

  11 * 8,                       /* ... %r15 */

  21 * 8,                       /* %rip */

  23 * 8,                       /* %eflags */

  22 * 8,                       /* %cs */

  25 * 8,                       /* %ss */

  18 * 8,                       /* %ds */

  17 * 8,                       /* %es */

  16 * 8,                       /* %fs */

  15 * 8                        /* %gs */

};

static void

amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)

{

  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* Initialize general-purpose register set details first.  */

  tdep->gregset_reg_offset = amd64nbsd_r_reg_offset;

  tdep->gregset_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);

  tdep->sizeof_gregset = 26 * 8;

  amd64_init_abi (info, gdbarch);

  tdep->jb_pc_offset = 7 * 8;

  /* NetBSD has its own convention for signal trampolines.  */

  tdep->sigtramp_p = amd64nbsd_sigtramp_p;

  tdep->sigcontext_addr = amd64nbsd_mcontext_addr;

  tdep->sc_reg_offset = amd64nbsd_r_reg_offset;

  tdep->sc_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);

  /* NetBSD uses SVR4-style shared libraries.  */

  set_solib_svr4_fetch_link_map_offsets

    (gdbarch, svr4_lp64_fetch_link_map_offsets);

}

/* Provide a prototype to silence -Wmissing-prototypes.  */

void _initialize_amd64nbsd_tdep (void);

void

_initialize_amd64nbsd_ndep (void)

{

  /* The NetBSD/amd64 native dependent code makes this assumption.  */

  gdb_assert (ARRAY_SIZE (amd64nbsd_r_reg_offset) == AMD64_NUM_GREGS);

  gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,

                          GDB_OSABI_NETBSD_ELF, amd64nbsd_init_abi);

}