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Diffstat (limited to 'gdb/user-regs.c')
| -rw-r--r-- | gdb/user-regs.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/gdb/user-regs.c b/gdb/user-regs.c new file mode 100644 index 0000000..3d60b2f --- /dev/null +++ b/gdb/user-regs.c @@ -0,0 +1,186 @@ +/* User visible, per-frame registers, for GDB, the GNU debugger. + + Copyright 2002 Free Software Foundation, Inc. + + Contributed by Red Hat. + + 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 2 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, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include "defs.h" +#include "user-regs.h" +#include "gdbtypes.h" +#include "gdb_string.h" +#include "gdb_assert.h" +#include "frame.h" + +/* A table of user registers. + + User registers have regnum's that live above of the range [0 + .. NUM_REGS + NUM_PSEUDO_REGS) (which is controlled by the target). + The target should never see a user register's regnum value. + + Always append, never delete. By doing this, the relative regnum + (offset from NUM_REGS + NUM_PSEUDO_REGS) assigned to each user + register never changes. */ + +struct user_reg +{ + const char *name; + struct value *(*read) (struct frame_info * frame); +}; + +struct user_regs +{ + struct user_reg *user; + int nr; +}; + +static void +append_user_reg (struct user_regs *regs, + const char *name, user_reg_read_ftype *read) +{ + regs->nr++; + regs->user = xrealloc (regs->user, + regs->nr * sizeof (struct user_reg)); + regs->user[regs->nr - 1].name = name; + regs->user[regs->nr - 1].read = read; +} + +/* An array of the builtin user registers. */ + +static struct user_regs builtin_user_regs; + +void +user_reg_add_builtin (const char *name, user_reg_read_ftype *read) +{ + append_user_reg (&builtin_user_regs, name, read); +} + +/* Per-architecture user registers. Start with the builtin user + registers and then, again, append. */ + +static struct gdbarch_data *user_regs_data; + +static void * +user_regs_init (struct gdbarch *gdbarch) +{ + int i; + struct user_regs *regs = XMALLOC (struct user_regs); + memset (regs, 0, sizeof (struct user_regs)); + for (i = 0; i < builtin_user_regs.nr; i++) + append_user_reg (regs, builtin_user_regs.user[i].name, + builtin_user_regs.user[i].read); + return regs; +} + +static void +user_regs_free (struct gdbarch *gdbarch, void *data) +{ + struct user_regs *regs = data; + xfree (regs->user); + xfree (regs); +} + +void +user_reg_add (struct gdbarch *gdbarch, const char *name, + user_reg_read_ftype *read) +{ + struct user_regs *regs = gdbarch_data (gdbarch, user_regs_data); + if (regs == NULL) + { + /* ULGH, called during architecture initialization. Patch + things up. */ + regs = user_regs_init (gdbarch); + set_gdbarch_data (gdbarch, user_regs_data, regs); + } + append_user_reg (regs, name, read); +} + +int +user_reg_map_name_to_regnum (struct gdbarch *gdbarch, const char *name, + int len) +{ + /* Make life easy, set the len to something reasonable. */ + if (len < 0) + len = strlen (name); + + /* Search register name space first - always let an architecture + specific register override the user registers. */ + { + int i; + int maxregs = (gdbarch_num_regs (gdbarch) + + gdbarch_num_pseudo_regs (gdbarch)); + for (i = 0; i < maxregs; i++) + { + const char *regname = gdbarch_register_name (gdbarch, i); + if (regname != NULL && len == strlen (regname) + && strncmp (regname, name, len) == 0) + { + return i; + } + } + } + + /* Search the user name space. */ + { + struct user_regs *regs = gdbarch_data (gdbarch, user_regs_data); + int reg; + for (reg = 0; reg < regs->nr; reg++) + { + if ((len < 0 && strcmp (regs->user[reg].name, name)) + || (len == strlen (regs->user[reg].name) + && strncmp (regs->user[reg].name, name, len) == 0)) + return NUM_REGS + NUM_PSEUDO_REGS + reg; + } + } + + return -1; +} + +const char * +user_reg_map_regnum_to_name (struct gdbarch *gdbarch, int regnum) +{ + int maxregs = (gdbarch_num_regs (gdbarch) + + gdbarch_num_pseudo_regs (gdbarch)); + struct user_regs *regs = gdbarch_data (gdbarch, user_regs_data); + if (regnum < 0) + return NULL; + if (regnum < maxregs) + return gdbarch_register_name (gdbarch, regnum); + if (regnum < (maxregs + regs->nr)) + return regs->user[regnum - maxregs].name; + return NULL; +} + +struct value * +value_of_user_reg (int regnum, struct frame_info *frame) +{ + struct gdbarch *gdbarch = get_frame_arch (frame); + struct user_regs *regs = gdbarch_data (gdbarch, user_regs_data); + int reg = regnum - (NUM_REGS + NUM_PSEUDO_REGS); + gdb_assert (reg >= 0 && reg < regs->nr); + return regs->user[reg].read (frame); +} + +extern initialize_file_ftype _initialize_user_regs; /* -Wmissing-prototypes */ + +void +_initialize_user_regs (void) +{ + user_regs_data = register_gdbarch_data (user_regs_init, user_regs_free); +} |