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Diffstat (limited to 'gdb/user-regs.c')
| -rw-r--r-- | gdb/user-regs.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/gdb/user-regs.c b/gdb/user-regs.c new file mode 100644 index 0000000..470a518 --- /dev/null +++ b/gdb/user-regs.c @@ -0,0 +1,205 @@ +/* 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_reg *next; +}; + +struct user_regs +{ + struct user_reg *first; + struct user_reg **last; +}; + +static void +append_user_reg (struct user_regs *regs, const char *name, + user_reg_read_ftype *read, struct user_reg *reg) +{ + /* The caller is responsible for allocating memory needed to store + the register. By doing this, the function can operate on a + register list stored in the common heap or a specific obstack. */ + gdb_assert (reg != NULL); + reg->name = name; + reg->read = read; + reg->next = NULL; + (*regs->last) = reg; + regs->last = &(*regs->last)->next; +} + +/* An array of the builtin user registers. */ + +static struct user_regs builtin_user_regs = { NULL, &builtin_user_regs.first }; + +void +user_reg_add_builtin (const char *name, user_reg_read_ftype *read) +{ + append_user_reg (&builtin_user_regs, name, read, + XMALLOC (struct user_reg)); +} + +/* 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) +{ + struct user_reg *reg; + struct user_regs *regs = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct user_regs); + regs->last = ®s->first; + for (reg = builtin_user_regs.first; reg != NULL; reg = reg->next) + append_user_reg (regs, reg->name, reg->read, + GDBARCH_OBSTACK_ZALLOC (gdbarch, struct user_reg)); + return 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, + GDBARCH_OBSTACK_ZALLOC (gdbarch, struct user_reg)); +} + +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); + struct user_reg *reg; + int nr; + for (nr = 0, reg = regs->first; reg != NULL; reg = reg->next, nr++) + { + if ((len < 0 && strcmp (reg->name, name)) + || (len == strlen (reg->name) + && strncmp (reg->name, name, len) == 0)) + return NUM_REGS + NUM_PSEUDO_REGS + nr; + } + } + + return -1; +} + +static struct user_reg * +usernum_to_user_reg (struct gdbarch *gdbarch, int usernum) +{ + struct user_regs *regs = gdbarch_data (gdbarch, user_regs_data); + struct user_reg *reg; + for (reg = regs->first; reg != NULL; reg = reg->next) + { + if (usernum == 0) + return reg; + usernum--; + } + return NULL; +} + +const char * +user_reg_map_regnum_to_name (struct gdbarch *gdbarch, int regnum) +{ + int maxregs = (gdbarch_num_regs (gdbarch) + + gdbarch_num_pseudo_regs (gdbarch)); + if (regnum < 0) + return NULL; + else if (regnum < maxregs) + return gdbarch_register_name (gdbarch, regnum); + else + { + struct user_reg *reg = usernum_to_user_reg (gdbarch, regnum - maxregs); + if (reg == NULL) + return NULL; + else + return reg->name; + } +} + +struct value * +value_of_user_reg (int regnum, struct frame_info *frame) +{ + struct gdbarch *gdbarch = get_frame_arch (frame); + int maxregs = (gdbarch_num_regs (gdbarch) + + gdbarch_num_pseudo_regs (gdbarch)); + struct user_reg *reg = usernum_to_user_reg (gdbarch, regnum - maxregs); + gdb_assert (reg != NULL); + return 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); +} |