/* User visible, per-frame registers, for GDB, the GNU debugger. Copyright 2002, 2003, 2004 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; }; /* This structure is named gdb_user_regs instead of user_regs to avoid conflicts with any "struct user_regs" in system headers. For instance, on ARM GNU/Linux native builds, nm-linux.h includes <signal.h> includes <sys/ucontext.h> includes <sys/procfs.h> includes <sys/user.h>, which declares "struct user_regs". */ struct gdb_user_regs { struct user_reg *first; struct user_reg **last; }; static void append_user_reg (struct gdb_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 gdb_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 gdb_user_regs *regs = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct gdb_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 gdb_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); deprecated_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 gdb_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 gdb_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 = gdbarch_data_register_post_init (user_regs_init); }