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/* Native-dependent code for FreeBSD/amd64.

   Copyright (C) 2003, 2004, 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 "inferior.h"

#include "regcache.h"

#include "target.h"

#include "gdb_assert.h"

#include <signal.h>

#include <stddef.h>

#include <sys/types.h>

#include <sys/ptrace.h>

#include <sys/sysctl.h>

#include <machine/reg.h>

#include "fbsd-nat.h"

#include "amd64-tdep.h"

#include "amd64-nat.h"

/* Offset in `struct reg' where MEMBER is stored.  */

#define REG_OFFSET(member) offsetof (struct reg, member)

/* At amd64fbsd64_r_reg_offset[REGNUM] you'll find the offset in

   `struct reg' location where the GDB register REGNUM is stored.

   Unsupported registers are marked with `-1'.  */

static int amd64fbsd64_r_reg_offset[] =

{

  REG_OFFSET (r_rax),

  REG_OFFSET (r_rbx),

  REG_OFFSET (r_rcx),

  REG_OFFSET (r_rdx),

  REG_OFFSET (r_rsi),

  REG_OFFSET (r_rdi),

  REG_OFFSET (r_rbp),

  REG_OFFSET (r_rsp),

  REG_OFFSET (r_r8),

  REG_OFFSET (r_r9),

  REG_OFFSET (r_r10),

  REG_OFFSET (r_r11),

  REG_OFFSET (r_r12),

  REG_OFFSET (r_r13),

  REG_OFFSET (r_r14),

  REG_OFFSET (r_r15),

  REG_OFFSET (r_rip),

  REG_OFFSET (r_rflags),

  REG_OFFSET (r_cs),

  REG_OFFSET (r_ss),

  -1,

  -1,

  -1,

  -1

};

/* Mapping between the general-purpose registers in FreeBSD/amd64

   `struct reg' format and GDB's register cache layout for

   FreeBSD/i386.

   Note that most FreeBSD/amd64 registers are 64-bit, while the

   FreeBSD/i386 registers are all 32-bit, but since we're

   little-endian we get away with that.  */

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

static int amd64fbsd32_r_reg_offset[I386_NUM_GREGS] =

{

  14 * 8, 13 * 8,               /* %eax, %ecx */

  12 * 8, 11 * 8,               /* %edx, %ebx */

  20 * 8, 10 * 8,               /* %esp, %ebp */

  9 * 8, 8 * 8,                 /* %esi, %edi */

  17 * 8, 19 * 8,               /* %eip, %eflags */

  18 * 8, 21 * 8,               /* %cs, %ss */

  -1, -1, -1, -1                /* %ds, %es, %fs, %gs */

};

/* Support for debugging kernel virtual memory images.  */

#include <sys/types.h>

#include <machine/pcb.h>

#include <osreldate.h>

#include "bsd-kvm.h"

static int

amd64fbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)

{

  /* The following is true for FreeBSD 5.2:

     The pcb contains %rip, %rbx, %rsp, %rbp, %r12, %r13, %r14, %r15,

     %ds, %es, %fs and %gs.  This accounts for all callee-saved

     registers specified by the psABI and then some.  Here %esp

     contains the stack pointer at the point just after the call to

     cpu_switch().  From this information we reconstruct the register

     state as it would like when we just returned from cpu_switch().  */

  /* The stack pointer shouldn't be zero.  */

  if (pcb->pcb_rsp == 0)

    return 0;

  pcb->pcb_rsp += 8;

  regcache_raw_supply (regcache, AMD64_RIP_REGNUM, &pcb->pcb_rip);

  regcache_raw_supply (regcache, AMD64_RBX_REGNUM, &pcb->pcb_rbx);

  regcache_raw_supply (regcache, AMD64_RSP_REGNUM, &pcb->pcb_rsp);

  regcache_raw_supply (regcache, AMD64_RBP_REGNUM, &pcb->pcb_rbp);

  regcache_raw_supply (regcache, 12, &pcb->pcb_r12);

  regcache_raw_supply (regcache, 13, &pcb->pcb_r13);

  regcache_raw_supply (regcache, 14, &pcb->pcb_r14);

  regcache_raw_supply (regcache, 15, &pcb->pcb_r15);

#if (__FreeBSD_version < 800075) && (__FreeBSD_kernel_version < 800075)

  /* struct pcb provides the pcb_ds/pcb_es/pcb_fs/pcb_gs fields only

     up until __FreeBSD_version 800074: The removal of these fields

     occurred on 2009-04-01 while the __FreeBSD_version number was

     bumped to 800075 on 2009-04-06.  So 800075 is the closest version

     number where we should not try to access these fields.  */

  regcache_raw_supply (regcache, AMD64_DS_REGNUM, &pcb->pcb_ds);

  regcache_raw_supply (regcache, AMD64_ES_REGNUM, &pcb->pcb_es);

  regcache_raw_supply (regcache, AMD64_FS_REGNUM, &pcb->pcb_fs);

  regcache_raw_supply (regcache, AMD64_GS_REGNUM, &pcb->pcb_gs);

#endif

  return 1;

}

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

void _initialize_amd64fbsd_nat (void);

void

_initialize_amd64fbsd_nat (void)

{

  struct target_ops *t;

  int offset;

  amd64_native_gregset32_reg_offset = amd64fbsd32_r_reg_offset;

  amd64_native_gregset64_reg_offset = amd64fbsd64_r_reg_offset;

  /* Add some extra features to the common *BSD/i386 target.  */

  t = amd64bsd_target ();

  t->to_pid_to_exec_file = fbsd_pid_to_exec_file;

  t->to_find_memory_regions = fbsd_find_memory_regions;

  t->to_make_corefile_notes = fbsd_make_corefile_notes;

  add_target (t);

  /* Support debugging kernel virtual memory images.  */

  bsd_kvm_add_target (amd64fbsd_supply_pcb);

  /* To support the recognition of signal handlers, i386bsd-tdep.c

     hardcodes some constants.  Inclusion of this file means that we

     are compiling a native debugger, which means that we can use the

     system header files and sysctl(3) to get at the relevant

     information.  */

#define SC_REG_OFFSET amd64fbsd_sc_reg_offset

  /* We only check the program counter, stack pointer and frame

     pointer since these members of `struct sigcontext' are essential

     for providing backtraces.  */

#define SC_RIP_OFFSET SC_REG_OFFSET[AMD64_RIP_REGNUM]

#define SC_RSP_OFFSET SC_REG_OFFSET[AMD64_RSP_REGNUM]

#define SC_RBP_OFFSET SC_REG_OFFSET[AMD64_RBP_REGNUM]

  /* Override the default value for the offset of the program counter

     in the sigcontext structure.  */

  offset = offsetof (struct sigcontext, sc_rip);

  if (SC_RIP_OFFSET != offset)

    {

      warning (_("\

offsetof (struct sigcontext, sc_rip) yields %d instead of %d.\n\

Please report this to <bug-gdb@gnu.org>."),

               offset, SC_RIP_OFFSET);

    }

  SC_RIP_OFFSET = offset;

  /* Likewise for the stack pointer.  */

  offset = offsetof (struct sigcontext, sc_rsp);

  if (SC_RSP_OFFSET != offset)

    {

      warning (_("\

offsetof (struct sigcontext, sc_rsp) yields %d instead of %d.\n\

Please report this to <bug-gdb@gnu.org>."),

               offset, SC_RSP_OFFSET);

    }

  SC_RSP_OFFSET = offset;

  /* And the frame pointer.  */

  offset = offsetof (struct sigcontext, sc_rbp);

  if (SC_RBP_OFFSET != offset)

    {

      warning (_("\

offsetof (struct sigcontext, sc_rbp) yields %d instead of %d.\n\

Please report this to <bug-gdb@gnu.org>."),

               offset, SC_RBP_OFFSET);

    }

  SC_RBP_OFFSET = offset;

  /* FreeBSD provides a kern.ps_strings sysctl that we can use to

     locate the sigtramp.  That way we can still recognize a sigtramp

     if its location is changed in a new kernel.  Of course this is

     still based on the assumption that the sigtramp is placed

     directly under the location where the program arguments and

     environment can be found.  */

  {

    int mib[2];

    long ps_strings;

    size_t len;

    mib[0] = CTL_KERN;

    mib[1] = KERN_PS_STRINGS;

    len = sizeof (ps_strings);

    if (sysctl (mib, 2, &ps_strings, &len, NULL, 0) == 0)

      {

        amd64fbsd_sigtramp_start_addr = ps_strings - 32;

        amd64fbsd_sigtramp_end_addr = ps_strings;

      }

  }

}