| /* Register support routines for the remote server for GDB. |
| Copyright (C) 2001, 2002, 2004, 2005, 2011 |
| Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| It has been modified to integrate it in valgrind |
| |
| 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., 51 Franklin Street, Fifth Floor, |
| Boston, MA 02110-1301, USA. */ |
| |
| #include "server.h" |
| #include "regdef.h" |
| |
| /* The private data for the register cache. Note that we have one |
| per inferior; this is primarily for simplicity, as the performance |
| benefit is minimal. */ |
| |
| struct inferior_regcache_data |
| { |
| int registers_valid; |
| unsigned char *registers; |
| Bool *register_supplied; /* set to True once it has been supplied */ |
| }; |
| |
| static int register_bytes; |
| |
| static struct reg *reg_defs; |
| static int num_registers; |
| |
| const char **gdbserver_expedite_regs; |
| |
| static |
| struct inferior_regcache_data * get_regcache (struct thread_info *inf, |
| int fetch) |
| { |
| struct inferior_regcache_data *regcache; |
| |
| regcache = (struct inferior_regcache_data *) inferior_regcache_data (inf); |
| |
| if (regcache == NULL) |
| fatal ("no register cache\n"); |
| |
| /* FIXME - fetch registers for INF */ |
| if (fetch && regcache->registers_valid == 0) { |
| fetch_inferior_registers (0); |
| regcache->registers_valid = 1; |
| } |
| |
| return regcache; |
| } |
| |
| void regcache_invalidate_one (struct inferior_list_entry *entry) |
| { |
| struct thread_info *thread = (struct thread_info *) entry; |
| struct inferior_regcache_data *regcache; |
| |
| regcache = (struct inferior_regcache_data *) inferior_regcache_data (thread); |
| |
| if (regcache->registers_valid) { |
| struct thread_info *saved_inferior = current_inferior; |
| |
| current_inferior = thread; |
| store_inferior_registers (-1); |
| current_inferior = saved_inferior; |
| } |
| |
| regcache->registers_valid = 0; |
| } |
| |
| void regcache_invalidate () |
| { |
| for_each_inferior (&all_threads, regcache_invalidate_one); |
| } |
| |
| int registers_length (void) |
| { |
| return 2 * register_bytes; |
| } |
| |
| void *new_register_cache (void) |
| { |
| struct inferior_regcache_data *regcache; |
| |
| regcache = malloc (sizeof (*regcache)); |
| |
| /* Make sure to zero-initialize the register cache when it is created, |
| in case there are registers the target never fetches. This way they'll |
| read as zero instead of garbage. */ |
| regcache->registers = calloc (1, register_bytes); |
| if (regcache->registers == NULL) |
| fatal ("Could not allocate register cache.\n"); |
| |
| regcache->register_supplied = calloc (1, num_registers); |
| if (regcache->register_supplied == NULL) |
| fatal ("Could not allocate register_supplied cache.\n"); |
| |
| regcache->registers_valid = 0; |
| |
| return regcache; |
| } |
| |
| void free_register_cache (void *regcache_p) |
| { |
| struct inferior_regcache_data *regcache |
| = (struct inferior_regcache_data *) regcache_p; |
| |
| free (regcache->registers); |
| free (regcache->register_supplied); |
| free (regcache); |
| } |
| |
| /* if a regcache exists for entry, reallocate it. |
| This is needed if the shadow registers are added. |
| In such a case, a 2nd call to set_register_cache is done |
| which will cause the reallocation of already created caches. */ |
| static |
| void regcache_realloc_one (struct inferior_list_entry *entry) |
| { |
| struct thread_info *thread = (struct thread_info *) entry; |
| struct inferior_regcache_data *regcache; |
| |
| regcache = (struct inferior_regcache_data *) inferior_regcache_data (thread); |
| |
| if (regcache) { |
| free_register_cache (regcache); |
| set_inferior_regcache_data (thread, new_register_cache ()); |
| } |
| } |
| |
| void set_register_cache (struct reg *regs, int n) |
| { |
| int offset, i; |
| |
| reg_defs = regs; |
| num_registers = n; |
| |
| offset = 0; |
| for (i = 0; i < n; i++) { |
| regs[i].offset = offset; |
| offset += regs[i].size; |
| } |
| |
| register_bytes = offset / 8; |
| |
| for_each_inferior (&all_threads, regcache_realloc_one); |
| } |
| |
| void registers_to_string (char *buf) |
| { |
| unsigned char *registers = get_regcache (current_inferior, 1)->registers; |
| |
| convert_int_to_ascii (registers, buf, register_bytes); |
| } |
| |
| void registers_from_string (char *buf) |
| { |
| int len = strlen (buf); |
| unsigned char *registers = get_regcache (current_inferior, 1)->registers; |
| |
| if (len != register_bytes * 2) { |
| warning ("Wrong sized register packet (expected %d bytes, got %d)\n", |
| 2*register_bytes, len); |
| if (len > register_bytes * 2) |
| len = register_bytes * 2; |
| } |
| convert_ascii_to_int (buf, registers, len / 2); |
| } |
| |
| int find_regno (const char *name) |
| { |
| int i; |
| |
| for (i = 0; i < num_registers; i++) |
| if (!strcmp (name, reg_defs[i].name)) |
| return i; |
| fatal ("Unknown register %s requested\n", name); |
| return -1; |
| } |
| |
| struct reg *find_register_by_number (int n) |
| { |
| return ®_defs[n]; |
| } |
| |
| int register_size (int n) |
| { |
| return reg_defs[n].size / 8; |
| } |
| |
| static |
| unsigned char *register_data (int n, int fetch) |
| { |
| unsigned char *registers |
| = get_regcache (current_inferior, fetch)->registers; |
| |
| return registers + (reg_defs[n].offset / 8); |
| } |
| static |
| unsigned char *register_data_for_supply (int n, int fetch, Bool *mod) |
| { |
| struct inferior_regcache_data * cache |
| = get_regcache (current_inferior, fetch); |
| unsigned char *registers = cache->registers; |
| |
| if (cache->register_supplied[n]) |
| *mod = False; |
| else |
| *mod = True; |
| cache->register_supplied[n] = True; |
| return registers + (reg_defs[n].offset / 8); |
| } |
| |
| void supply_register (int n, const void *buf, Bool *mod) |
| { |
| Bool new; |
| VG_(dmemcpy) (register_data_for_supply (n, 0, &new), |
| buf, register_size (n), mod); |
| if (new) |
| *mod = True; |
| } |
| |
| void supply_register_from_string (int n, const char *buf, Bool *mod) |
| { |
| Bool new; |
| unsigned char bytes_register[register_size (n)]; |
| convert_ascii_to_int ((char *) buf, bytes_register, register_size (n)); |
| VG_(dmemcpy) (register_data_for_supply (n, 0, &new), |
| bytes_register, register_size (n), mod); |
| if (new) |
| *mod = True; |
| } |
| |
| void supply_register_by_name (const char *name, const void *buf, Bool *mod) |
| { |
| supply_register (find_regno (name), buf, mod); |
| } |
| |
| void collect_register (int n, void *buf) |
| { |
| VG_(memcpy) (buf, register_data (n, 1), register_size (n)); |
| } |
| |
| void collect_register_as_string (int n, char *buf) |
| { |
| convert_int_to_ascii (register_data (n, 1), buf, register_size (n)); |
| } |
| |
| void collect_register_by_name (const char *name, void *buf) |
| { |
| collect_register (find_regno (name), buf); |
| } |