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/* Target-dependent code for FreeBSD/amd64.

   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 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 "arch-utils.h"

#include "frame.h"

#include "gdbcore.h"

#include "regcache.h"

#include "osabi.h"

#include "gdb_assert.h"

#include "gdb_string.h"

#include "amd64-tdep.h"

#include "bsd-uthread.h"

#include "solib-svr4.h"

/* Support for signal handlers.  */

/* Assuming THIS_FRAME is for a BSD sigtramp routine, return the

   address of the associated sigcontext structure.  */

static CORE_ADDR

amd64fbsd_sigcontext_addr (struct frame_info *this_frame)

{

  CORE_ADDR sp;

  /* The `struct sigcontext' (which really is an `ucontext_t' on

     FreeBSD/amd64) lives at a fixed offset in the signal frame.  See

     <machine/sigframe.h>.  */

  sp = frame_unwind_register_unsigned (this_frame, AMD64_RSP_REGNUM);

  return sp + 16;

}

/* FreeBSD 5.1-RELEASE or later.  */

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

   format and GDB's register cache layout.

   Note that some registers are 32-bit, but since we're little-endian

   we get away with that.  */

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

static int amd64fbsd_r_reg_offset[] =

{

  14 * 8,                       /* %rax */

  11 * 8,                       /* %rbx */

  13 * 8,                       /* %rcx */

  12 * 8,                       /* %rdx */

  9 * 8,                        /* %rsi */

  8 * 8,                        /* %rdi */

  10 * 8,                       /* %rbp */

  20 * 8,                       /* %rsp */

  7 * 8,                        /* %r8 ... */

  6 * 8,

  5 * 8,

  4 * 8,

  3 * 8,

  2 * 8,

  1 * 8,

  17 * 8,                       /* %rip */

  19 * 8,                       /* %eflags */

  18 * 8,                       /* %cs */

  21 * 8,                       /* %ss */

  -1,                           /* %ds */

  -1,                           /* %es */

  -1,                           /* %fs */

  -1                            /* %gs */

};

/* Location of the signal trampoline.  */

CORE_ADDR amd64fbsd_sigtramp_start_addr = 0x7fffffffffc0ULL;

CORE_ADDR amd64fbsd_sigtramp_end_addr = 0x7fffffffffe0ULL;

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

int amd64fbsd_sc_reg_offset[] =

{

  24 + 6 * 8,                   /* %rax */

  24 + 7 * 8,                   /* %rbx */

  24 + 3 * 8,                   /* %rcx */

  24 + 2 * 8,                   /* %rdx */

  24 + 1 * 8,                   /* %rsi */

  24 + 0 * 8,                    /* %rdi */

  24 + 8 * 8,                   /* %rbp */

  24 + 22 * 8,                  /* %rsp */

  24 + 4 * 8,                   /* %r8 ... */

  24 + 5 * 8,

  24 + 9 * 8,

  24 + 10 * 8,

  24 + 11 * 8,

  24 + 12 * 8,

  24 + 13 * 8,

  24 + 14 * 8,                  /* ... %r15 */

  24 + 19 * 8,                  /* %rip */

  24 + 21 * 8,                  /* %eflags */

  24 + 20 * 8,                  /* %cs */

  24 + 23 * 8,                  /* %ss */

  -1,                           /* %ds */

  -1,                           /* %es */

  -1,                           /* %fs */

  -1                            /* %gs */

};

/* From /usr/src/lib/libc/amd64/gen/_setjmp.S.  */

static int amd64fbsd_jmp_buf_reg_offset[] =

{

  -1,                           /* %rax */

  1 * 8,                        /* %rbx */

  -1,                           /* %rcx */

  -1,                           /* %rdx */

  -1,                           /* %rsi */

  -1,                           /* %rdi */

  3 * 8,                        /* %rbp */

  2 * 8,                        /* %rsp */

  -1,                           /* %r8 ... */

  -1,

  -1,

  -1,                           /* ... %r11 */

  4 * 8,                        /* %r12 ... */

  5 * 8,

  6 * 8,

  7 * 8,                        /* ... %r15 */

};

static void

amd64fbsd_supply_uthread (struct regcache *regcache,

                          int regnum, CORE_ADDR addr)

{

  gdb_byte buf[8];

  int i;

  gdb_assert (regnum >= -1);

  for (i = 0; i < ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset); i++)

    {

      if (amd64fbsd_jmp_buf_reg_offset[i] != -1

          && (regnum == -1 || regnum == i))

        {

          read_memory (addr + amd64fbsd_jmp_buf_reg_offset[i], buf, 8);

          regcache_raw_supply (regcache, i, buf);

        }

    }

}

static void

amd64fbsd_collect_uthread (const struct regcache *regcache,

                           int regnum, CORE_ADDR addr)

{

  gdb_byte buf[8];

  int i;

  gdb_assert (regnum >= -1);

  for (i = 0; i < ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset); i++)

    {

      if (amd64fbsd_jmp_buf_reg_offset[i] != -1

          && (regnum == -1 || regnum == i))

        {

          regcache_raw_collect (regcache, i, buf);

          write_memory (addr + amd64fbsd_jmp_buf_reg_offset[i], buf, 8);

        }

    }

}

static void

amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)

{

  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* Obviously FreeBSD is BSD-based.  */

  i386bsd_init_abi (info, gdbarch);

  tdep->gregset_reg_offset = amd64fbsd_r_reg_offset;

  tdep->gregset_num_regs = ARRAY_SIZE (amd64fbsd_r_reg_offset);

  tdep->sizeof_gregset = 22 * 8;

  amd64_init_abi (info, gdbarch);

  tdep->sigtramp_start = amd64fbsd_sigtramp_start_addr;

  tdep->sigtramp_end = amd64fbsd_sigtramp_end_addr;

  tdep->sigcontext_addr = amd64fbsd_sigcontext_addr;

  tdep->sc_reg_offset = amd64fbsd_sc_reg_offset;

  tdep->sc_num_regs = ARRAY_SIZE (amd64fbsd_sc_reg_offset);

  /* FreeBSD provides a user-level threads implementation.  */

  bsd_uthread_set_supply_uthread (gdbarch, amd64fbsd_supply_uthread);

  bsd_uthread_set_collect_uthread (gdbarch, amd64fbsd_collect_uthread);

  /* FreeBSD 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_amd64fbsd_tdep (void);

void

_initialize_amd64fbsd_tdep (void)

{

  gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,

                          GDB_OSABI_FREEBSD_ELF, amd64fbsd_init_abi);

}