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/* Target-dependent code for Solaris x86.

   Copyright (C) 2002, 2003, 2004, 2006, 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 "value.h"

#include "osabi.h"

#include "gdb_string.h"

#include "sol2-tdep.h"

#include "i386-tdep.h"

#include "solib-svr4.h"

/* From <ia32/sys/reg.h>.  */

static int i386_sol2_gregset_reg_offset[] =

{

  11 * 4,                       /* %eax */

  10 * 4,                       /* %ecx */

  9 * 4,                        /* %edx */

  8 * 4,                        /* %ebx */

  17 * 4,                       /* %esp */

  6 * 4,                        /* %ebp */

  5 * 4,                        /* %esi */

  4 * 4,                        /* %edi */

  14 * 4,                       /* %eip */

  16 * 4,                       /* %eflags */

  15 * 4,                       /* %cs */

  18 * 4,                       /* %ss */

  3 * 4,                        /* %ds */

  2 * 4,                        /* %es */

  1 * 4,                        /* %fs */

};

/* Return whether the frame preceding NEXT_FRAME corresponds to a

   Solaris sigtramp routine.  */

static int

i386_sol2_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 (name && (strcmp ("sigacthandler", name) == 0

                   || strcmp (name, "ucbsigvechandler") == 0));

}

/* Solaris doesn't have a `struct sigcontext', but it does have a

   `mcontext_t' that contains the saved set of machine registers.  */

static CORE_ADDR

i386_sol2_mcontext_addr (struct frame_info *next_frame)

{

  CORE_ADDR sp, ucontext_addr;

  sp = frame_unwind_register_unsigned (next_frame, I386_ESP_REGNUM);

  ucontext_addr = get_frame_memory_unsigned (next_frame, sp + 8, 4);

  return ucontext_addr + 36;

}

/* SunPRO encodes the static variables.  This is not related to C++

   mangling, it is done for C too.  */

static char *

i386_sol2_static_transform_name (char *name)

{

  char *p;

  if (name[0] == '.')

    {

      /* For file-local statics there will be a period, a bunch of

         junk (the contents of which match a string given in the

         N_OPT), a period and the name.  For function-local statics

         there will be a bunch of junk (which seems to change the

         second character from 'A' to 'B'), a period, the name of the

         function, and the name.  So just skip everything before the

         last period.  */

      p = strrchr (name, '.');

      if (p != NULL)

        name = p + 1;

    }

  return name;

}

/* Solaris 2.  */

static void

i386_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)

{

  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* Solaris is SVR4-based.  */

  i386_svr4_init_abi (info, gdbarch);

  /* The SunPRO compiler puts out 0 instead of the address in N_SO symbols,

     and for SunPRO 3.0, N_FUN symbols too.  */

  set_gdbarch_sofun_address_maybe_missing (gdbarch, 1);

  /* Handle SunPRO encoding of static symbols.  */

  set_gdbarch_static_transform_name (gdbarch, i386_sol2_static_transform_name);

  /* Solaris reserves space for its FPU emulator in `fpregset_t'.

     There is also some space reserved for the registers of a Weitek

     math coprocessor.  */

  tdep->gregset_reg_offset = i386_sol2_gregset_reg_offset;

  tdep->gregset_num_regs = ARRAY_SIZE (i386_sol2_gregset_reg_offset);

  tdep->sizeof_gregset = 19 * 4;

  tdep->sizeof_fpregset = 380;

  /* Signal trampolines are slightly different from SVR4.  */

  tdep->sigtramp_p = i386_sol2_sigtramp_p;

  tdep->sigcontext_addr = i386_sol2_mcontext_addr;

  tdep->sc_reg_offset = tdep->gregset_reg_offset;

  tdep->sc_num_regs = tdep->gregset_num_regs;

  /* Solaris has SVR4-style shared libraries.  */

  set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);

  set_solib_svr4_fetch_link_map_offsets

    (gdbarch, svr4_ilp32_fetch_link_map_offsets);

}

static enum gdb_osabi

i386_sol2_osabi_sniffer (bfd *abfd)

{

  /* If we have a section named .SUNW_version, then it is almost

     certainly Solaris 2.  */

  if (bfd_get_section_by_name (abfd, ".SUNW_version"))

    return GDB_OSABI_SOLARIS;

  return GDB_OSABI_UNKNOWN;

}

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

void _initialize_i386_sol2_tdep (void);

void

_initialize_i386_sol2_tdep (void)

{

  /* Register an ELF OS ABI sniffer for Solaris 2 binaries.  */

  gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,

                                  i386_sol2_osabi_sniffer);

  gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_SOLARIS,

                          i386_sol2_init_abi);

}