text: /* Native-dependent code for FreeBSD/amd64.
  
     Copyright 2003, 2004 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 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 "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 "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);
    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);
  
    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;
        }
    }
  }
  