gdb/i386-sol2-tdep.c

/* Target-dependent code for Solaris x86.

   Copyright (C) 2002, 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011
   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 */
  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);
  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 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);

  /* 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);
}