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/* Target-dependent code for GNU/Linux UltraSPARC.

   Copyright (C) 2003, 2004, 2005, 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 "dwarf2-frame.h"

#include "regset.h"

#include "regcache.h"

#include "gdbarch.h"

#include "gdbcore.h"

#include "osabi.h"

#include "solib-svr4.h"

#include "symtab.h"

#include "trad-frame.h"

#include "tramp-frame.h"

#include "sparc64-tdep.h"

/* Signal trampoline support.  */

static void sparc64_linux_sigframe_init (const struct tramp_frame *self,

                                         struct frame_info *next_frame,

                                         struct trad_frame_cache *this_cache,

                                         CORE_ADDR func);

/* See sparc-linux-tdep.c for details.  Note that 64-bit binaries only

   use RT signals.  */

static const struct tramp_frame sparc64_linux_rt_sigframe =

{

  SIGTRAMP_FRAME,

  4,

  {

    { 0x82102065, -1 },         /* mov __NR_rt_sigreturn, %g1 */

    { 0x91d0206d, -1 },         /* ta  0x6d */

    { TRAMP_SENTINEL_INSN, -1 }

  },

  sparc64_linux_sigframe_init

};

static void

sparc64_linux_sigframe_init (const struct tramp_frame *self,

                             struct frame_info *next_frame,

                             struct trad_frame_cache *this_cache,

                             CORE_ADDR func)

{

  CORE_ADDR base, addr, sp_addr;

  int regnum;

  base = frame_unwind_register_unsigned (next_frame, SPARC_O1_REGNUM);

  base += 128;

  /* Offsets from <bits/sigcontext.h>.  */

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

  addr = base + 8;

  sp_addr = base + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 8);

  for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++)

    {

      trad_frame_set_reg_addr (this_cache, regnum, addr);

      addr += 8;

    }

  trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0);

  trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8);

  trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16);

  trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24);

  trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28);

  base = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);

  if (base & 1)

    base += BIAS;

  addr = get_frame_memory_unsigned (next_frame, sp_addr, 8);

  if (addr & 1)

    addr += BIAS;

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

    {

      trad_frame_set_reg_addr (this_cache, regnum, addr);

      addr += 8;

    }

  trad_frame_set_id (this_cache, frame_id_build (base, func));

}

/* Return the address of a system call's alternative return

   address.  */

static CORE_ADDR

sparc64_linux_step_trap (struct frame_info *frame, unsigned long insn)

{

  if (insn == 0x91d0206d)

    {

      ULONGEST sp = get_frame_register_unsigned (frame, SPARC_SP_REGNUM);

      if (sp & 1)

        sp += BIAS;

      /* The kernel puts the sigreturn registers on the stack,

         and this is where the signal unwinding state is take from

         when returning from a signal.

         A siginfo_t sits 192 bytes from the base of the stack.  This

         siginfo_t is 128 bytes, and is followed by the sigreturn

         register save area.  The saved PC sits at a 136 byte offset

         into there.  */

      return read_memory_unsigned_integer (sp + 192 + 128 + 136, 8);

    }

  return 0;

}

const struct sparc_gregset sparc64_linux_core_gregset =

{

  32 * 8,                       /* %tstate */

  33 * 8,                       /* %tpc */

  34 * 8,                       /* %tnpc */

  35 * 8,                       /* %y */

  -1,                           /* %wim */

  -1,                           /* %tbr */

  1 * 8,                        /* %g1 */

  16 * 8,                       /* %l0 */

  8,                            /* y size */

};

static void

sparc64_linux_supply_core_gregset (const struct regset *regset,

                                   struct regcache *regcache,

                                   int regnum, const void *gregs, size_t len)

{

  sparc64_supply_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs);

}

static void

sparc64_linux_collect_core_gregset (const struct regset *regset,

                                    const struct regcache *regcache,

                                    int regnum, void *gregs, size_t len)

{

  sparc64_collect_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs);

}

static void

sparc64_linux_supply_core_fpregset (const struct regset *regset,

                                    struct regcache *regcache,

                                    int regnum, const void *fpregs, size_t len)

{

  sparc64_supply_fpregset (regcache, regnum, fpregs);

}

static void

sparc64_linux_collect_core_fpregset (const struct regset *regset,

                                     const struct regcache *regcache,

                                     int regnum, void *fpregs, size_t len)

{

  sparc64_collect_fpregset (regcache, regnum, fpregs);

}

static void

sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)

{

  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  tdep->gregset = regset_alloc (gdbarch, sparc64_linux_supply_core_gregset,

                                sparc64_linux_collect_core_gregset);

  tdep->sizeof_gregset = 288;

  tdep->fpregset = regset_alloc (gdbarch, sparc64_linux_supply_core_fpregset,

                                 sparc64_linux_collect_core_fpregset);

  tdep->sizeof_fpregset = 280;

  tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);

  /* Hook in the DWARF CFI frame unwinder.  */

  frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);

  sparc64_init_abi (info, gdbarch);

  /* GNU/Linux has SVR4-style shared libraries...  */

  set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);

  set_solib_svr4_fetch_link_map_offsets

    (gdbarch, svr4_lp64_fetch_link_map_offsets);

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

     prologue analysis.  */

  tdep->plt_entry_size = 16;

  /* Enable TLS support.  */

  set_gdbarch_fetch_tls_load_module_address (gdbarch,

                                             svr4_fetch_objfile_link_map);

  /* Make sure we can single-step over signal return system calls.  */

  tdep->step_trap = sparc64_linux_step_trap;

}

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

extern void _initialize_sparc64_linux_tdep (void);

void

_initialize_sparc64_linux_tdep (void)

{

  gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,

                          GDB_OSABI_LINUX, sparc64_linux_init_abi);

}