187 lines
5.0 KiB
C
187 lines
5.0 KiB
C
/* User visible, per-frame registers, for GDB, the GNU debugger.
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Copyright 2002 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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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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.. NUM_REGS + NUM_PSEUDO_REGS) (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 NUM_REGS + NUM_PSEUDO_REGS) assigned to each user
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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);
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};
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struct user_regs
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{
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struct user_reg *user;
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int nr;
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};
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static void
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append_user_reg (struct user_regs *regs,
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const char *name, user_reg_read_ftype *read)
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{
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regs->nr++;
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regs->user = xrealloc (regs->user,
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regs->nr * sizeof (struct user_reg));
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regs->user[regs->nr - 1].name = name;
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regs->user[regs->nr - 1].read = read;
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}
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/* An array of the builtin user registers. */
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static struct user_regs builtin_user_regs;
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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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{
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append_user_reg (&builtin_user_regs, name, read);
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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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int i;
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struct user_regs *regs = XMALLOC (struct user_regs);
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memset (regs, 0, sizeof (struct user_regs));
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for (i = 0; i < builtin_user_regs.nr; i++)
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append_user_reg (regs, builtin_user_regs.user[i].name,
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builtin_user_regs.user[i].read);
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return regs;
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}
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static void
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user_regs_free (struct gdbarch *gdbarch, void *data)
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{
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struct user_regs *regs = data;
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xfree (regs->user);
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xfree (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)
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{
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struct 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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set_gdbarch_data (gdbarch, user_regs_data, regs);
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}
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append_user_reg (regs, name, read);
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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 user_regs *regs = gdbarch_data (gdbarch, user_regs_data);
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int reg;
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for (reg = 0; reg < regs->nr; reg++)
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{
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if ((len < 0 && strcmp (regs->user[reg].name, name))
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|| (len == strlen (regs->user[reg].name)
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&& strncmp (regs->user[reg].name, name, len) == 0))
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return NUM_REGS + NUM_PSEUDO_REGS + reg;
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}
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}
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return -1;
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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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struct user_regs *regs = gdbarch_data (gdbarch, user_regs_data);
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if (regnum < 0)
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return NULL;
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if (regnum < maxregs)
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return gdbarch_register_name (gdbarch, regnum);
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if (regnum < (maxregs + regs->nr))
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return regs->user[regnum - maxregs].name;
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return NULL;
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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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struct user_regs *regs = gdbarch_data (gdbarch, user_regs_data);
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int reg = regnum - (NUM_REGS + NUM_PSEUDO_REGS);
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gdb_assert (reg >= 0 && reg < regs->nr);
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return regs->user[reg].read (frame);
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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 = register_gdbarch_data (user_regs_init, user_regs_free);
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}
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