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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [gdb/] [user-regs.c] - Blame information for rev 227

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1 227 jeremybenn
/* User visible, per-frame registers, for GDB, the GNU debugger.
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   Copyright (C) 2002, 2003, 2004, 2007, 2008, 2009, 2010
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   Free Software Foundation, Inc.
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   Contributed by Red Hat.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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#include "defs.h"
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#include "user-regs.h"
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#include "gdbtypes.h"
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#include "gdb_string.h"
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#include "gdb_assert.h"
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#include "frame.h"
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/* A table of user registers.
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   User registers have regnum's that live above of the range [0
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   .. gdbarch_num_regs + gdbarch_num_pseudo_regs)
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   (which is controlled by the target).
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   The target should never see a user register's regnum value.
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   Always append, never delete.  By doing this, the relative regnum
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   (offset from gdbarch_num_regs + gdbarch_num_pseudo_regs)
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    assigned to each user  register never changes.  */
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struct user_reg
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{
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  const char *name;
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  struct value *(*read) (struct frame_info * frame, const void *baton);
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  const void *baton;
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  struct user_reg *next;
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};
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/* This structure is named gdb_user_regs instead of user_regs to avoid
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   conflicts with any "struct user_regs" in system headers.  For instance,
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   on ARM GNU/Linux native builds, nm-linux.h includes <signal.h> includes
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   <sys/ucontext.h> includes <sys/procfs.h> includes <sys/user.h>, which
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   declares "struct user_regs".  */
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struct gdb_user_regs
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{
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  struct user_reg *first;
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  struct user_reg **last;
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};
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static void
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append_user_reg (struct gdb_user_regs *regs, const char *name,
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                 user_reg_read_ftype *read, const void *baton,
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                 struct user_reg *reg)
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{
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  /* The caller is responsible for allocating memory needed to store
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     the register.  By doing this, the function can operate on a
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     register list stored in the common heap or a specific obstack.  */
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  gdb_assert (reg != NULL);
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  reg->name = name;
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  reg->read = read;
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  reg->baton = baton;
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  reg->next = NULL;
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  (*regs->last) = reg;
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  regs->last = &(*regs->last)->next;
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}
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/* An array of the builtin user registers.  */
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static struct gdb_user_regs builtin_user_regs = { NULL, &builtin_user_regs.first };
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void
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user_reg_add_builtin (const char *name, user_reg_read_ftype *read,
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                      const void *baton)
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{
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  append_user_reg (&builtin_user_regs, name, read, baton,
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                   XMALLOC (struct user_reg));
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}
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/* Per-architecture user registers.  Start with the builtin user
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   registers and then, again, append.  */
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static struct gdbarch_data *user_regs_data;
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static void *
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user_regs_init (struct gdbarch *gdbarch)
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{
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  struct user_reg *reg;
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  struct gdb_user_regs *regs = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct gdb_user_regs);
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  regs->last = &regs->first;
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  for (reg = builtin_user_regs.first; reg != NULL; reg = reg->next)
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    append_user_reg (regs, reg->name, reg->read, reg->baton,
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                     GDBARCH_OBSTACK_ZALLOC (gdbarch, struct user_reg));
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  return regs;
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}
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void
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user_reg_add (struct gdbarch *gdbarch, const char *name,
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              user_reg_read_ftype *read, const void *baton)
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{
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  struct gdb_user_regs *regs = gdbarch_data (gdbarch, user_regs_data);
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  if (regs == NULL)
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    {
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      /* ULGH, called during architecture initialization.  Patch
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         things up.  */
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      regs = user_regs_init (gdbarch);
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      deprecated_set_gdbarch_data (gdbarch, user_regs_data, regs);
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    }
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  append_user_reg (regs, name, read, baton,
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                   GDBARCH_OBSTACK_ZALLOC (gdbarch, struct user_reg));
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}
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int
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user_reg_map_name_to_regnum (struct gdbarch *gdbarch, const char *name,
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                             int len)
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{
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  /* Make life easy, set the len to something reasonable.  */
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  if (len < 0)
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    len = strlen (name);
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  /* Search register name space first - always let an architecture
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     specific register override the user registers.  */
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  {
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    int i;
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    int maxregs = (gdbarch_num_regs (gdbarch)
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                   + gdbarch_num_pseudo_regs (gdbarch));
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    for (i = 0; i < maxregs; i++)
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      {
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        const char *regname = gdbarch_register_name (gdbarch, i);
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        if (regname != NULL && len == strlen (regname)
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            && strncmp (regname, name, len) == 0)
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          {
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            return i;
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          }
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      }
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  }
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  /* Search the user name space.  */
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  {
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    struct gdb_user_regs *regs = gdbarch_data (gdbarch, user_regs_data);
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    struct user_reg *reg;
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    int nr;
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    for (nr = 0, reg = regs->first; reg != NULL; reg = reg->next, nr++)
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      {
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        if ((len < 0 && strcmp (reg->name, name))
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            || (len == strlen (reg->name)
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                && strncmp (reg->name, name, len) == 0))
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          return gdbarch_num_regs (gdbarch)
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                 + gdbarch_num_pseudo_regs (gdbarch) + nr;
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      }
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  }
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  return -1;
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}
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static struct user_reg *
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usernum_to_user_reg (struct gdbarch *gdbarch, int usernum)
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{
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  struct gdb_user_regs *regs = gdbarch_data (gdbarch, user_regs_data);
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  struct user_reg *reg;
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  for (reg = regs->first; reg != NULL; reg = reg->next)
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    {
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      if (usernum == 0)
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        return reg;
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      usernum--;
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    }
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  return NULL;
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}
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const char *
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user_reg_map_regnum_to_name (struct gdbarch *gdbarch, int regnum)
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{
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  int maxregs = (gdbarch_num_regs (gdbarch)
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                 + gdbarch_num_pseudo_regs (gdbarch));
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  if (regnum < 0)
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    return NULL;
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  else if (regnum < maxregs)
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    return gdbarch_register_name (gdbarch, regnum);
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  else
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    {
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      struct user_reg *reg = usernum_to_user_reg (gdbarch, regnum - maxregs);
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      if (reg == NULL)
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        return NULL;
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      else
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        return reg->name;
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    }
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}
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struct value *
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value_of_user_reg (int regnum, struct frame_info *frame)
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{
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  struct gdbarch *gdbarch = get_frame_arch (frame);
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  int maxregs = (gdbarch_num_regs (gdbarch)
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                 + gdbarch_num_pseudo_regs (gdbarch));
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  struct user_reg *reg = usernum_to_user_reg (gdbarch, regnum - maxregs);
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  gdb_assert (reg != NULL);
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  return reg->read (frame, reg->baton);
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}
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extern initialize_file_ftype _initialize_user_regs; /* -Wmissing-prototypes */
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void
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_initialize_user_regs (void)
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{
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  user_regs_data = gdbarch_data_register_post_init (user_regs_init);
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}

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