text: /* Target-dependent code for Solaris x86.
  
     Copyright (C) 2002-2017 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 "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 */
    0 * 4				/* %gs */
  };
  
  /* Return whether THIS_FRAME corresponds to a Solaris sigtramp
     routine.  */
  
  static int
  i386_sol2_sigtramp_p (struct frame_info *this_frame)
  {
    CORE_ADDR pc = get_frame_pc (this_frame);
    const 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 *this_frame)
  {
    CORE_ADDR sp, ucontext_addr;
  
    sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM);
    ucontext_addr = get_frame_memory_unsigned (this_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 const char *
  i386_sol2_static_transform_name (const char *name)
  {
    if (name[0] == '.')
      {
        const char *p;
  
        /* 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);
  
    /* How to print LWP PTIDs from core files.  */
    set_gdbarch_core_pid_to_str (gdbarch, sol2_core_pid_to_str);
  }
  
  
  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);
  }
  