1 /* Common definitions for remote server for GDB. 2 Copyright (C) 1993, 1995, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, 3 2006, 2012 4 Free Software Foundation, Inc. 5 6 This file is part of GDB. 7 It has been modified to integrate it in valgrind 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 2 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program; if not, write to the Free Software 21 Foundation, Inc., 51 Franklin Street, Fifth Floor, 22 Boston, MA 02110-1301, USA. */ 23 24 #ifndef SERVER_H 25 #define SERVER_H 26 27 #include "pub_core_basics.h" 28 #include "pub_core_vki.h" 29 #include "pub_core_xarray.h" 30 #include "pub_core_clientstate.h" 31 #include "pub_core_debuglog.h" 32 #include "pub_core_errormgr.h" 33 #include "pub_core_libcassert.h" 34 #include "pub_core_libcfile.h" 35 #include "pub_core_libcprint.h" 36 #include "pub_core_mallocfree.h" 37 #include "pub_core_syscall.h" 38 #include "pub_core_libcproc.h" 39 #include "pub_core_tooliface.h" 40 #include "pub_core_libcassert.h" 41 #include "pub_core_libcbase.h" 42 #include "pub_core_options.h" 43 #include "pub_core_libcsetjmp.h" 44 #include "pub_core_threadstate.h" 45 #include "pub_core_gdbserver.h" 46 #include "pub_core_aspacemgr.h" 47 #include "pub_core_vki.h" 48 #include "pub_core_clreq.h" 49 50 /*------------- interface m_gdbserver <=> low level gdbserver */ 51 52 /* Initializes gdbserver. After a call to gdbserver_init, vgdb 53 can contact the gdbserver embedded in valgrind. 54 The rest of the low level gdbserver interface can only 55 be called */ 56 extern void gdbserver_init (void); 57 58 extern void server_main (void); 59 60 /* To be called to indicate that gdbserver usage is finished. 61 Resources (e.g. FIFOs) will be destroyed. */ 62 extern void gdbserver_terminate (void); 63 64 65 /* Output string s to the gdb debugging this process or to vgdb. 66 Do not call this directly. Rather use VG_(gdb_printf) 67 to output something to gdb, use normal valgrind messaging 68 (e.g. VG_(umsg)) to send output that can either go 69 to gdb or to log. */ 70 extern void monitor_output (char *s); 71 72 /* returns 0 if there is no connection or no event on the connection 73 with gdb. 74 returns 1 if there are some data which has been received from gdb 75 and that must (still) be handled. 76 returns 2 if remote_desc_activity detected the connection has been 77 lost and should be reopened. 78 msg is used for debug logging.*/ 79 extern int remote_desc_activity(const char *msg); 80 81 /* output some status of gdbserver communication */ 82 extern void remote_utils_output_status(void); 83 84 /* True if there is a connection with gdb. */ 85 extern Bool remote_connected(void); 86 87 /* Finish the connection with gdb and reset_valgrind_sink. 88 Keeps the FIFOs and shared mem so as to allow connection 89 to be reopened. */ 90 extern void remote_finish(FinishReason reason); 91 92 /* If Valgrind sink was changed by gdbserver: 93 Resets the valgrind sink to before the changes done by gdbserver, 94 and does VG_(umsg). If info != NULL, info added in VG_(usmg). */ 95 extern void reset_valgrind_sink(const char* info); 96 97 // VG_(gdb_printf) by default writes to vgdb/gdb. 98 // If there is no connection, it will rather write to the initial (log) 99 // valgrind fd using the below. 100 extern void print_to_initial_valgrind_sink (const char *msg); 101 102 /* For ARM usage. 103 Guesses if pc is a thumb pc. 104 In this case, returns pc with the thumb bit set (bit0) 105 else just returns pc. 106 107 The guess is based on the following set of check: 108 if bit0 set => thumb 109 else if bit1 set => thumb 110 else uses the debuginfo to guess. 111 112 If debug info not found for this pc, assumes arm */ 113 extern Addr thumb_pc (Addr pc); 114 115 /* when invoked by vgdb using ptrace, contains the tid chosen 116 by vgdb (if vgdb gives a tid different of 0: a 0 tid by 117 vgdb means use the running_tid if there is one running 118 or tid 1 otherwise). */ 119 extern ThreadId vgdb_interrupted_tid; 120 121 /*------------ end of interface to low level gdbserver */ 122 123 124 #define dlog(level, ...) \ 125 do { if (UNLIKELY(VG_(debugLog_getLevel)() >= level)) \ 126 VG_(debugLog) (level, "gdbsrv",__VA_ARGS__); } \ 127 while (0) 128 129 130 /* vki only defines VKI_POLLIN but even not on all OS. 131 Below is from linux bits/poll.h */ 132 #ifndef VKI_POLLIN 133 #define VKI_POLLIN 0x0001 134 #endif 135 #define VKI_POLLPRI 0x0002 136 #define VKI_POLLOUT 0x0004 137 #define VKI_POLLERR 0x0008 138 #define VKI_POLLHUP 0x0010 139 #define VKI_POLLNVAL 0x0020 140 141 /* a bunch of macros to avoid libc usage in valgrind-ified gdbserver */ 142 #define strcmp(s1,s2) VG_(strcmp) ((s1),(s2)) 143 #define strncmp(s1,s2,nmax) VG_(strncmp) ((s1),(s2),nmax) 144 #define strcat(s1,s2) VG_(strcat) ((s1),(s2)) 145 #define strcpy(s1,s2) VG_(strcpy) ((s1),(s2)) 146 #define strncpy(s1,s2,nmax) VG_(strncpy) ((s1),(s2),nmax) 147 #define strlen(s) VG_(strlen) ((s)) 148 #define strtok(p,s) VG_(strtok) ((p),(s)) 149 #define strtok_r(p,s,ss) VG_(strtok_r) ((p),(s),(ss)) 150 #define strchr(s,c) VG_(strchr) ((s),c) 151 /* strtol and strtoul supports base 16 or else assumes it is base 10 */ 152 #define strtol(s,r,b) ((b) == 16 ? \ 153 VG_(strtoll16) ((s),(r)) \ 154 : VG_(strtoll10) ((s),(r))) 155 #define strtoul(s,r,b) ((b) == 16 ? \ 156 VG_(strtoull16) ((s),(r)) \ 157 : VG_(strtoull10) ((s),(r))) 158 159 #define malloc(sz) VG_(arena_malloc) (VG_AR_CORE, "gdbsrv", sz) 160 #define calloc(n,sz) VG_(arena_calloc) (VG_AR_CORE, "gdbsrv", n, sz) 161 #define realloc(p,size) VG_(arena_realloc) (VG_AR_CORE, "gdbsrv", p, size) 162 #define strdup(s) VG_(arena_strdup) (VG_AR_CORE, "gdbsrv", (s)) 163 #define free(b) VG_(arena_free) (VG_AR_CORE, b) 164 165 #ifndef ATTR_NORETURN 166 #if defined(__GNUC__) && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)) 167 #define ATTR_NORETURN __attribute__ ((noreturn)) 168 #else 169 #define ATTR_NORETURN /* nothing */ 170 #endif 171 #endif 172 173 #ifndef ATTR_FORMAT 174 #if defined(__GNUC__) && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 4)) 175 #define ATTR_FORMAT(type, x, y) __attribute__ ((format(type, x, y))) 176 #else 177 #define ATTR_FORMAT(type, x, y) /* nothing */ 178 #endif 179 #endif 180 181 /* A type used for binary buffers. */ 182 typedef unsigned char gdb_byte; 183 184 typedef Addr CORE_ADDR; 185 186 /* Generic information for tracking a list of ``inferiors'' - threads, 187 processes, etc. */ 188 struct inferior_list 189 { 190 struct inferior_list_entry *head; 191 struct inferior_list_entry *tail; 192 }; 193 struct inferior_list_entry 194 { 195 unsigned long id; 196 struct inferior_list_entry *next; 197 }; 198 199 /* Opaque type for user-visible threads. */ 200 struct thread_info; 201 202 #include "regcache.h" 203 #include "gdb/signals.h" 204 205 /* signal handling with gdbserver: before delivering a signal, 206 call gdbserver_signal_encountered. This will set 207 the signal to report in the next resume reply sent to GDB. 208 A call to call_gdbserver is needed to send the resume reply to GDB. 209 After this call, gdbserver_deliver_signal indicates if the signal 210 is effectively to be delivered to the guest process. */ 211 extern void gdbserver_signal_encountered (Int vki_sigNo); 212 /* between these two calls, call call_gdbserver */ 213 /* If gdbserver_deliver_signal True, then gdb did not ask 214 to ignore the signal, so signal can be delivered to the guest. */ 215 extern Bool gdbserver_deliver_signal (Int vki_sigNo); 216 217 /* Called when a process is about to go with reason ('W' or 'X') and code. 218 This sets global variables that will be used to return the process 219 exit status to GDB in the next resume_reply. 220 Similarly to gdbserver_signal_encountered, a call to call_gdbserver 221 is needed to send the resume reply. */ 222 extern void gdbserver_process_exit_encountered (unsigned char status, Int code); 223 224 /* To optimise signal handling, gdb can instruct gdbserver to 225 not stop on some signals. In the below, a 1 indicates the gdb_nr signal 226 has to be passed directly to the guest, without asking gdb. 227 A 0 indicates gdb has to be consulted to see if signal has 228 or has not to be passed. The gdb consultation is to 229 be done using the above two functions. */ 230 extern int pass_signals[]; /* indexed by gdb signal nr */ 231 232 233 #include "target.h" 234 235 /* Target-specific functions */ 236 237 /* From inferiors.c. */ 238 239 extern struct inferior_list all_threads; 240 void add_inferior_to_list (struct inferior_list *list, 241 struct inferior_list_entry *new_inferior); 242 void for_each_inferior (struct inferior_list *list, 243 void (*action) (struct inferior_list_entry *)); 244 extern struct thread_info *current_inferior; 245 void remove_inferior (struct inferior_list *list, 246 struct inferior_list_entry *entry); 247 void remove_thread (struct thread_info *thread); 248 void add_thread (unsigned long thread_id, void *target_data, unsigned int); 249 unsigned int thread_id_to_gdb_id (unsigned long); 250 unsigned int thread_to_gdb_id (struct thread_info *); 251 unsigned long gdb_id_to_thread_id (unsigned int); 252 struct thread_info *gdb_id_to_thread (unsigned int); 253 void clear_inferiors (void); 254 struct inferior_list_entry *find_inferior (struct inferior_list *, 255 int (*func) (struct 256 inferior_list_entry *, 257 void *), 258 void *arg); 259 struct inferior_list_entry *find_inferior_id (struct inferior_list *list, 260 unsigned long id); 261 void *inferior_target_data (struct thread_info *); 262 void set_inferior_target_data (struct thread_info *, void *); 263 void *inferior_regcache_data (struct thread_info *); 264 void set_inferior_regcache_data (struct thread_info *, void *); 265 void change_inferior_id (struct inferior_list *list, 266 unsigned long new_id); 267 268 /* Public variables in server.c */ 269 270 extern unsigned long cont_thread; 271 extern unsigned long general_thread; 272 extern unsigned long step_thread; 273 extern unsigned long thread_from_wait; 274 extern unsigned long old_thread_from_wait; 275 276 extern VG_MINIMAL_JMP_BUF(toplevel); 277 278 /* From remote-utils.c */ 279 280 extern Bool noack_mode; 281 int putpkt (char *buf); 282 int putpkt_binary (char *buf, int len); 283 int getpkt (char *buf); 284 void remote_open (const HChar *name); 285 void remote_close (void); 286 287 void sync_gdb_connection (void); 288 void write_ok (char *buf); 289 void write_enn (char *buf); 290 void convert_ascii_to_int (const char *from, unsigned char *to, int n); 291 void convert_int_to_ascii (const unsigned char *from, char *to, int n); 292 void prepare_resume_reply (char *buf, char status, unsigned char sig); 293 294 void decode_address (CORE_ADDR *addrp, const char *start, int len); 295 void decode_m_packet (char *from, CORE_ADDR * mem_addr_ptr, 296 unsigned int *len_ptr); 297 void decode_M_packet (char *from, CORE_ADDR * mem_addr_ptr, 298 unsigned int *len_ptr, unsigned char *to); 299 int decode_X_packet (char *from, int packet_len, CORE_ADDR * mem_addr_ptr, 300 unsigned int *len_ptr, unsigned char *to); 301 302 int unhexify (char *bin, const char *hex, int count); 303 int hexify (char *hex, const char *bin, int count); 304 /* heximage builds an image of bin according to byte order of the architecture 305 Useful for register and int image */ 306 char* heximage (char *buf, char *bin, int count); 307 308 /* convert from CORE_ADDR to void* */ 309 void* C2v(CORE_ADDR addr); 310 311 312 int remote_escape_output (const gdb_byte *buffer, int len, 313 gdb_byte *out_buf, int *out_len, 314 int out_maxlen); 315 316 /* Functions from ``signals.c''. */ 317 enum target_signal target_signal_from_host (int hostsig); 318 int target_signal_to_host_p (enum target_signal oursig); 319 int target_signal_to_host (enum target_signal oursig); 320 const char *target_signal_to_name (enum target_signal); 321 322 /* Functions from utils.c */ 323 324 /* error is like VG_(umsg), then VG_MINIMAL_LONGJMP to gdbserver toplevel. */ 325 void error (const char *string,...) ATTR_NORETURN ATTR_FORMAT (printf, 1, 2); 326 /* first output a description of the error inside sr, then like VG_(umsg). */ 327 void sr_perror (SysRes sr,const char *string,...) ATTR_FORMAT (printf, 2, 3); 328 /* fatal is like VG_(umsg), then exit(1). */ 329 void fatal (const char *string,...) ATTR_NORETURN ATTR_FORMAT (printf, 1, 2); 330 /* warning is like VG_(umsg). */ 331 void warning (const char *string,...) ATTR_FORMAT (printf, 1, 2); 332 333 /* Functions from the register cache definition. */ 334 335 void init_registers (void); 336 337 /* Maximum number of bytes to read/write at once. The value here 338 is chosen to fill up a packet (the headers account for the 32). */ 339 #define MAXBUFBYTES(N) (((N)-32)/2) 340 341 /* PBUFSIZ : Buffers size for transferring memory, registers, etc. 342 Must be big enough to hold all the registers, at least. 343 Must be at least big as 2*DATASIZ + 5: 344 1 : packet begin ($ or %) 345 + 2*DATASIZ : encoded string 346 + 1 : packet end (#) 347 + 2 : packet checksum 348 + 1 : \0 349 350 Max value gdb likes is 16384. 351 352 Note that what is sent/received to/from gdb does 353 not have a trailing null byte. We are adding 1 here to allow 354 null terminating the strings e.g. for printf. 355 356 => packet Packet OVERHead SIZe is 5:*/ 357 358 /* keep PBUFSIZ value in sync with vgdb.c */ 359 #define PBUFSIZ 16384 360 #define POVERHSIZ 5 361 362 /* Max size of a string encoded in a packet. Hex Encoding can 363 multiply the size by 2 (trailing null byte not sent). */ 364 #define DATASIZ ((PBUFSIZ-POVERHSIZ)/2) 365 366 /* Version information, from version.c. */ 367 extern const char version[]; 368 369 #endif /* SERVER_H */ 370
