Subversion Repositories openrisc_2011-10-31

/* Target-dependent code for FreeBSD/sparc64.

   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010

   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 "osabi.h"

#include "regcache.h"

#include "regset.h"

#include "target.h"

#include "trad-frame.h"

#include "gdb_assert.h"

#include "gdb_string.h"

#include "sparc64-tdep.h"

#include "solib-svr4.h"

/* From <machine/reg.h>.  */

const struct sparc_gregset sparc64fbsd_gregset =

{

  26 * 8,                       /* "tstate" */

  25 * 8,                       /* %pc */

  24 * 8,                       /* %npc */

  28 * 8,                       /* %y */

  16 * 8,                       /* %fprs */

  -1,

  1 * 8,                        /* %g1 */

  -1,                           /* %l0 */

  8                             /* sizeof (%y) */

};

static void

sparc64fbsd_supply_gregset (const struct regset *regset,

                            struct regcache *regcache,

                            int regnum, const void *gregs, size_t len)

{

  sparc64_supply_gregset (&sparc64fbsd_gregset, regcache, regnum, gregs);

}

static void

sparc64fbsd_collect_gregset (const struct regset *regset,

                             const struct regcache *regcache,

                             int regnum, void *gregs, size_t len)

{

  sparc64_collect_gregset (&sparc64fbsd_gregset, regcache, regnum, gregs);

}

static void

sparc64fbsd_supply_fpregset (const struct regset *regset,

                             struct regcache *regcache,

                             int regnum, const void *fpregs, size_t len)

{

  sparc64_supply_fpregset (regcache, regnum, fpregs);

}

static void

sparc64fbsd_collect_fpregset (const struct regset *regset,

                              const struct regcache *regcache,

                              int regnum, void *fpregs, size_t len)

{

  sparc64_collect_fpregset (regcache, regnum, fpregs);

}

/* Signal trampolines.  */

static int

sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, char *name)

{

  return (name && strcmp (name, "__sigtramp") == 0);

}

static struct sparc_frame_cache *

sparc64fbsd_sigtramp_frame_cache (struct frame_info *this_frame,

                                   void **this_cache)

{

  struct sparc_frame_cache *cache;

  CORE_ADDR addr, mcontext_addr, sp;

  LONGEST fprs;

  int regnum;

  if (*this_cache)

    return *this_cache;

  cache = sparc_frame_cache (this_frame, this_cache);

  gdb_assert (cache == *this_cache);

  cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);

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

     which has a member `uc_mcontext' that contains the saved

     registers.  */

  addr = get_frame_register_unsigned (this_frame, SPARC_O2_REGNUM);

  mcontext_addr = addr + 64;

  /* The following registers travel in the `mc_local' slots of

     `mcontext_t'.  */

  addr = mcontext_addr + 16 * 8;

  cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8;

  cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8;

  /* The following registers travel in the `mc_in' slots of

     `mcontext_t'.  */

  addr = mcontext_addr + 24 * 8;

  cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8;

  cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8;

  cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8;

  cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8;

  /* The `global' and `out' registers travel in the `mc_global' and

     `mc_out' slots of `mcontext_t', except for %g0.  Since %g0 is

     always zero, keep the identity encoding.  */

  for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8;

       regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)

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

  /* The `local' and `in' registers have been saved in the register

     save area.  */

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

  sp = get_frame_memory_unsigned (this_frame, addr, 8);

  for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;

       regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)

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

  /* The floating-point registers are only saved if the FEF bit in

     %fprs has been set.  */

#define FPRS_FEF        (1 << 2)

  addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr;

  fprs = get_frame_memory_unsigned (this_frame, addr, 8);

  if (fprs & FPRS_FEF)

    {

      for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8;

           regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)

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

      for (regnum = SPARC64_F32_REGNUM;

           regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8)

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

    }

  return cache;

}

static void

sparc64fbsd_sigtramp_frame_this_id (struct frame_info *this_frame,

                                    void **this_cache,

                                    struct frame_id *this_id)

{

  struct sparc_frame_cache *cache =

    sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);

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

}

static struct value *

sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *this_frame,

                                          void **this_cache, int regnum)

{

  struct sparc_frame_cache *cache =

    sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);

  return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);

}

static int

sparc64fbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,

                                    struct frame_info *this_frame,

                                    void **this_cache)

{

  CORE_ADDR pc = get_frame_pc (this_frame);

  char *name;

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

  if (sparc64fbsd_pc_in_sigtramp (pc, name))

    return 1;

  return 0;

}

static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind =

{

  SIGTRAMP_FRAME,

  sparc64fbsd_sigtramp_frame_this_id,

  sparc64fbsd_sigtramp_frame_prev_register,

  NULL,

  sparc64fbsd_sigtramp_frame_sniffer

};

static void

sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)

{

  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  tdep->gregset = regset_alloc (gdbarch, sparc64fbsd_supply_gregset,

                                sparc64fbsd_collect_gregset);

  tdep->sizeof_gregset = 256;

  tdep->fpregset = regset_alloc (gdbarch, sparc64fbsd_supply_fpregset,

                                 sparc64fbsd_collect_fpregset);

  tdep->sizeof_fpregset = 272;

  frame_unwind_append_unwinder (gdbarch, &sparc64fbsd_sigtramp_frame_unwind);

  sparc64_init_abi (info, gdbarch);

  /* FreeBSD/sparc64 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);

}

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

void _initialize_sparc64fbsd_tdep (void);

void

_initialize_sparc64fbsd_tdep (void)

{

  gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,

                          GDB_OSABI_FREEBSD_ELF, sparc64fbsd_init_abi);

}