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/* Target-dependent code for Solaris SPARC.

   Copyright (C) 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 "frame.h"

#include "frame-unwind.h"

#include "gdbcore.h"

#include "symtab.h"

#include "objfiles.h"

#include "osabi.h"

#include "regcache.h"

#include "target.h"

#include "trad-frame.h"

#include "gdb_assert.h"

#include "gdb_string.h"

#include "sol2-tdep.h"

#include "sparc-tdep.h"

#include "solib-svr4.h"

/* From <sys/regset.h>.  */

const struct sparc_gregset sparc32_sol2_gregset =

{

  32 * 4,                       /* %psr */

  33 * 4,                       /* %pc */

  34 * 4,                       /* %npc */

  35 * 4,                       /* %y */

  36 * 4,                       /* %wim */

  37 * 4,                       /* %tbr */

  1 * 4,                        /* %g1 */

  16 * 4,                       /* %l0 */

};

/* The Solaris signal trampolines reside in libc.  For normal signals,

   the function `sigacthandler' is used.  This signal trampoline will

   call the signal handler using the System V calling convention,

   where the third argument is a pointer to an instance of

   `ucontext_t', which has a member `uc_mcontext' that contains the

   saved registers.  Incidentally, the kernel passes the `ucontext_t'

   pointer as the third argument of the signal trampoline too, and

   `sigacthandler' simply passes it on. However, if you link your

   program with "-L/usr/ucblib -R/usr/ucblib -lucb", the function

   `ucbsigvechandler' will be used, which invokes the using the BSD

   convention, where the third argument is a pointer to an instance of

   `struct sigcontext'.  It is the `ucbsigvechandler' function that

   converts the `ucontext_t' to a `sigcontext', and back.  Unless the

   signal handler modifies the `struct sigcontext' we can safely

   ignore this.  */

int

sparc_sol2_pc_in_sigtramp (CORE_ADDR pc, char *name)

{

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

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

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

}

static struct sparc_frame_cache *

sparc32_sol2_sigtramp_frame_cache (struct frame_info *next_frame,

                                   void **this_cache)

{

  struct sparc_frame_cache *cache;

  CORE_ADDR mcontext_addr, addr;

  int regnum;

  if (*this_cache)

    return *this_cache;

  cache = sparc_frame_cache (next_frame, this_cache);

  gdb_assert (cache == *this_cache);

  cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);

  /* The third argument is a pointer to an instance of `ucontext_t',

     which has a member `uc_mcontext' that contains the saved

     registers.  */

  regnum = (cache->frameless_p ? SPARC_O2_REGNUM : SPARC_I2_REGNUM);

  mcontext_addr = frame_unwind_register_unsigned (next_frame, regnum) + 40;

  cache->saved_regs[SPARC32_PSR_REGNUM].addr = mcontext_addr + 0 * 4;

  cache->saved_regs[SPARC32_PC_REGNUM].addr = mcontext_addr + 1 * 4;

  cache->saved_regs[SPARC32_NPC_REGNUM].addr = mcontext_addr + 2 * 4;

  cache->saved_regs[SPARC32_Y_REGNUM].addr = mcontext_addr + 3 * 4;

  /* Since %g0 is always zero, keep the identity encoding.  */

  for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 4 * 4;

       regnum <= SPARC_O7_REGNUM; regnum++, addr += 4)

    cache->saved_regs[regnum].addr = addr;

  if (get_frame_memory_unsigned (next_frame, mcontext_addr + 19 * 4, 4))

    {

      /* The register windows haven't been flushed.  */

      for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)

        trad_frame_set_unknown (cache->saved_regs, regnum);

    }

  else

    {

      addr = cache->saved_regs[SPARC_SP_REGNUM].addr;

      addr = get_frame_memory_unsigned (next_frame, addr, 4);

      for (regnum = SPARC_L0_REGNUM;

           regnum <= SPARC_I7_REGNUM; regnum++, addr += 4)

        cache->saved_regs[regnum].addr = addr;

    }

  return cache;

}

static void

sparc32_sol2_sigtramp_frame_this_id (struct frame_info *next_frame,

                                     void **this_cache,

                                     struct frame_id *this_id)

{

  struct sparc_frame_cache *cache =

    sparc32_sol2_sigtramp_frame_cache (next_frame, this_cache);

  (*this_id) = frame_id_build (cache->base, cache->pc);

}

static void

sparc32_sol2_sigtramp_frame_prev_register (struct frame_info *next_frame,

                                           void **this_cache,

                                           int regnum, int *optimizedp,

                                           enum lval_type *lvalp,

                                           CORE_ADDR *addrp,

                                           int *realnump, gdb_byte *valuep)

{

  struct sparc_frame_cache *cache =

    sparc32_sol2_sigtramp_frame_cache (next_frame, this_cache);

  trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,

                                optimizedp, lvalp, addrp, realnump, valuep);

}

static const struct frame_unwind sparc32_sol2_sigtramp_frame_unwind =

{

  SIGTRAMP_FRAME,

  sparc32_sol2_sigtramp_frame_this_id,

  sparc32_sol2_sigtramp_frame_prev_register

};

static const struct frame_unwind *

sparc32_sol2_sigtramp_frame_sniffer (struct frame_info *next_frame)

{

  CORE_ADDR pc = frame_pc_unwind (next_frame);

  char *name;

  find_pc_partial_function (pc, &name, NULL, NULL);

  if (sparc_sol2_pc_in_sigtramp (pc, name))

    return &sparc32_sol2_sigtramp_frame_unwind;

  return NULL;

}

/* Unglobalize NAME.  */

char *

sparc_sol2_static_transform_name (char *name)

{

  /* The Sun compilers (Sun ONE Studio, Forte Developer, Sun WorkShop,

     SunPRO) convert file static variables into global values, a

     process known as globalization.  In order to do this, the

     compiler will create a unique prefix and prepend it to each file

     static variable.  For static variables within a function, this

     globalization prefix is followed by the function name (nested

     static variables within a function are supposed to generate a

     warning message, and are left alone).  The procedure is

     documented in the Stabs Interface Manual, which is distrubuted

     with the compilers, although version 4.0 of the manual seems to

     be incorrect in some places, at least for SPARC.  The

     globalization prefix is encoded into an N_OPT stab, with the form

     "G=<prefix>".  The globalization prefix always seems to start

     with a dollar sign '$'; a dot '.' is used as a seperator.  So we

     simply strip everything up until the last dot.  */

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

    {

      char *p = strrchr (name, '.');

      if (p)

        return p + 1;

    }

  return name;

}

void

sparc32_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)

{

  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* The Sun compilers (Sun ONE Studio, Forte Developer, Sun WorkShop, SunPRO)

     compiler puts out 0 instead of the address in N_SO stabs.  Starting with

     SunPRO 3.0, the compiler does this for N_FUN stabs too.  */

  set_gdbarch_sofun_address_maybe_missing (gdbarch, 1);

  /* The Sun compilers also do "globalization"; see the comment in

     sparc_sol2_static_transform_name for more information.  */

  set_gdbarch_static_transform_name

    (gdbarch, sparc_sol2_static_transform_name);

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

  set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);

  set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);

  set_solib_svr4_fetch_link_map_offsets

    (gdbarch, svr4_ilp32_fetch_link_map_offsets);

  /* ...which means that we need some special handling when doing

     prologue analysis.  */

  tdep->plt_entry_size = 12;

  /* Solaris has kernel-assisted single-stepping support.  */

  set_gdbarch_software_single_step (gdbarch, NULL);

  frame_unwind_append_sniffer (gdbarch, sparc32_sol2_sigtramp_frame_sniffer);

}

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

void _initialize_sparc_sol2_tdep (void);

void

_initialize_sparc_sol2_tdep (void)

{

  gdbarch_register_osabi (bfd_arch_sparc, 0,

                          GDB_OSABI_SOLARIS, sparc32_sol2_init_abi);

}