| 1 | /* Multi-threaded debugging support for the thread_db interface, |
| 2 | used on operating systems such as Solaris and Linux. |
| 3 | Copyright 1999 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | /* This module implements a thread_stratum target that sits on top of |
| 23 | a normal process_stratum target (such as procfs or ptrace). The |
| 24 | process_stratum target must install this thread_stratum target when |
| 25 | it detects the presence of the thread_db shared library. |
| 26 | |
| 27 | This module will then use the thread_db API to add thread-awareness |
| 28 | to the functionality provided by the process_stratum target (or in |
| 29 | some cases, to add user-level thread awareness on top of the |
| 30 | kernel-level thread awareness that is already provided by the |
| 31 | process_stratum target). |
| 32 | |
| 33 | Solaris threads (for instance) are a multi-level thread implementation; |
| 34 | the kernel provides a Light Weight Process (LWP) which the procfs |
| 35 | process_stratum module is aware of. This module must then mediate |
| 36 | the relationship between kernel LWP threads and user (eg. posix) |
| 37 | threads. |
| 38 | |
| 39 | Linux threads are likely to be different -- but the thread_db |
| 40 | library API should make the difference largely transparent to GDB. |
| 41 | |
| 42 | */ |
| 43 | |
| 44 | /* The thread_db API provides a number of functions that give the caller |
| 45 | access to the inner workings of the child process's thread library. |
| 46 | We will be using the following (others may be added): |
| 47 | |
| 48 | td_thr_validate Confirm valid "live" thread |
| 49 | td_thr_get_info Get info about a thread |
| 50 | td_thr_getgregs Get thread's general registers |
| 51 | td_thr_getfpregs Get thread's floating point registers |
| 52 | td_thr_setgregs Set thread's general registers |
| 53 | td_thr_setfpregs Set thread's floating point registers |
| 54 | td_ta_map_id2thr Get thread handle from thread id |
| 55 | td_ta_map_lwp2thr Get thread handle from LWP id |
| 56 | td_ta_thr_iter Iterate over all threads (with callback) |
| 57 | |
| 58 | In return, the debugger has to provide certain services to the |
| 59 | thread_db library. Some of these aren't actually required to do |
| 60 | anything in practice. For instance, the thread_db expects to be |
| 61 | able to stop the child process and start it again: but in our |
| 62 | context, the child process will always be stopped already when we |
| 63 | invoke the thread_db library, so the functions that we provide for |
| 64 | the library to stop and start the child process are no-ops. |
| 65 | |
| 66 | Here is the list of functions which we export to the thread_db |
| 67 | library, divided into no-op functions vs. functions that actually |
| 68 | have to do something: |
| 69 | |
| 70 | No-op functions: |
| 71 | |
| 72 | ps_pstop Stop the child process |
| 73 | ps_pcontinue Continue the child process |
| 74 | ps_lstop Stop a specific LWP (kernel thread) |
| 75 | ps_lcontinue Continue an LWP |
| 76 | ps_lgetxregsize Get size of LWP's xregs (sparc) |
| 77 | ps_lgetxregs Get LWP's xregs (sparc) |
| 78 | ps_lsetxregs Set LWP's xregs (sparc) |
| 79 | |
| 80 | Functions that have to do useful work: |
| 81 | |
| 82 | ps_pglobal_lookup Get the address of a global symbol |
| 83 | ps_pdread Read memory, data segment |
| 84 | ps_ptread Read memory, text segment |
| 85 | ps_pdwrite Write memory, data segment |
| 86 | ps_ptwrite Write memory, text segment |
| 87 | ps_lgetregs Get LWP's general registers |
| 88 | ps_lgetfpregs Get LWP's floating point registers |
| 89 | ps_lsetregs Set LWP's general registers |
| 90 | ps_lsetfpregs Set LWP's floating point registers |
| 91 | ps_lgetLDT Get LWP's Local Descriptor Table (x86) |
| 92 | |
| 93 | Thus, if we ask the thread_db library to give us the general registers |
| 94 | for user thread X, thread_db may figure out that user thread X is |
| 95 | actually mapped onto kernel thread Y. Thread_db does not know how |
| 96 | to obtain the registers for kernel thread Y, but GDB does, so thread_db |
| 97 | turns the request right back to us via the ps_lgetregs callback. */ |
| 98 | |
| 99 | #include "defs.h" |
| 100 | #include "gdbthread.h" |
| 101 | #include "target.h" |
| 102 | #include "inferior.h" |
| 103 | #include "gdbcmd.h" |
| 104 | |
| 105 | #include "gdb_wait.h" |
| 106 | |
| 107 | #include <time.h> |
| 108 | |
| 109 | #if defined(USE_PROC_FS) || defined(HAVE_GREGSET_T) |
| 110 | #include <sys/procfs.h> |
| 111 | #endif |
| 112 | |
| 113 | #if defined (HAVE_PROC_SERVICE_H) |
| 114 | #include <proc_service.h> /* defines incoming API (ps_* callbacks) */ |
| 115 | #else |
| 116 | #include "gdb_proc_service.h" |
| 117 | #endif |
| 118 | |
| 119 | #if defined HAVE_STDINT_H /* Pre-5.2 systems don't have this header */ |
| 120 | #if defined (HAVE_THREAD_DB_H) |
| 121 | #include <thread_db.h> /* defines outgoing API (td_thr_* calls) */ |
| 122 | #else |
| 123 | #include "gdb_thread_db.h" |
| 124 | #endif |
| 125 | |
| 126 | #include <dlfcn.h> /* dynamic library interface */ |
| 127 | |
| 128 | #ifndef TIDGET |
| 129 | #define TIDGET(PID) (((PID) & 0x7fffffff) >> 16) |
| 130 | #define PIDGET(PID) (((PID) & 0xffff)) |
| 131 | #define MERGEPID(PID, TID) (((PID) & 0xffff) | ((TID) << 16)) |
| 132 | #endif |
| 133 | |
| 134 | /* Macros for superimposing PID and TID into inferior_pid. */ |
| 135 | #define THREAD_FLAG 0x80000000 |
| 136 | #define is_thread(ARG) (((ARG) & THREAD_FLAG) != 0) |
| 137 | #define is_lwp(ARG) (((ARG) & THREAD_FLAG) == 0) |
| 138 | #define GET_LWP(PID) TIDGET (PID) |
| 139 | #define GET_THREAD(PID) TIDGET (PID) |
| 140 | #define BUILD_LWP(TID, PID) MERGEPID (PID, TID) |
| 141 | #define BUILD_THREAD(TID, PID) (MERGEPID (PID, TID) | THREAD_FLAG) |
| 142 | |
| 143 | /* |
| 144 | * target_beneath is a pointer to the target_ops underlying this one. |
| 145 | */ |
| 146 | |
| 147 | static struct target_ops *target_beneath; |
| 148 | |
| 149 | |
| 150 | /* |
| 151 | * target vector defined in this module: |
| 152 | */ |
| 153 | |
| 154 | static struct target_ops thread_db_ops; |
| 155 | |
| 156 | /* |
| 157 | * Typedefs required to resolve differences between the thread_db |
| 158 | * and proc_service API defined on different versions of Solaris: |
| 159 | */ |
| 160 | |
| 161 | #if defined(PROC_SERVICE_IS_OLD) |
| 162 | typedef const struct ps_prochandle *gdb_ps_prochandle_t; |
| 163 | typedef char *gdb_ps_read_buf_t; |
| 164 | typedef char *gdb_ps_write_buf_t; |
| 165 | typedef int gdb_ps_size_t; |
| 166 | #else |
| 167 | typedef struct ps_prochandle *gdb_ps_prochandle_t; |
| 168 | typedef void *gdb_ps_read_buf_t; |
| 169 | typedef const void *gdb_ps_write_buf_t; |
| 170 | typedef size_t gdb_ps_size_t; |
| 171 | #endif |
| 172 | |
| 173 | /* |
| 174 | * proc_service callback functions, called by thread_db. |
| 175 | */ |
| 176 | |
| 177 | ps_err_e |
| 178 | ps_pstop (gdb_ps_prochandle_t ph) /* Process stop */ |
| 179 | { |
| 180 | return PS_OK; |
| 181 | } |
| 182 | |
| 183 | ps_err_e |
| 184 | ps_pcontinue (gdb_ps_prochandle_t ph) /* Process continue */ |
| 185 | { |
| 186 | return PS_OK; |
| 187 | } |
| 188 | |
| 189 | ps_err_e |
| 190 | ps_lstop (gdb_ps_prochandle_t ph, /* LWP stop */ |
| 191 | lwpid_t lwpid) |
| 192 | { |
| 193 | return PS_OK; |
| 194 | } |
| 195 | |
| 196 | ps_err_e |
| 197 | ps_lcontinue (gdb_ps_prochandle_t ph, /* LWP continue */ |
| 198 | lwpid_t lwpid) |
| 199 | { |
| 200 | return PS_OK; |
| 201 | } |
| 202 | |
| 203 | ps_err_e |
| 204 | ps_lgetxregsize (gdb_ps_prochandle_t ph, /* Get XREG size */ |
| 205 | lwpid_t lwpid, |
| 206 | int *xregsize) |
| 207 | { |
| 208 | return PS_OK; |
| 209 | } |
| 210 | |
| 211 | ps_err_e |
| 212 | ps_lgetxregs (gdb_ps_prochandle_t ph, /* Get XREGS */ |
| 213 | lwpid_t lwpid, |
| 214 | caddr_t xregset) |
| 215 | { |
| 216 | return PS_OK; |
| 217 | } |
| 218 | |
| 219 | ps_err_e |
| 220 | ps_lsetxregs (gdb_ps_prochandle_t ph, /* Set XREGS */ |
| 221 | lwpid_t lwpid, |
| 222 | caddr_t xregset) |
| 223 | { |
| 224 | return PS_OK; |
| 225 | } |
| 226 | |
| 227 | void |
| 228 | ps_plog (const char *fmt, ...) |
| 229 | { |
| 230 | va_list args; |
| 231 | |
| 232 | va_start (args, fmt); |
| 233 | vfprintf_filtered (gdb_stderr, fmt, args); |
| 234 | } |
| 235 | |
| 236 | /* Look up a symbol in GDB's global symbol table. |
| 237 | Return the symbol's address. |
| 238 | FIXME: it would be more correct to look up the symbol in the context |
| 239 | of the LD_OBJECT_NAME provided. However we're probably fairly safe |
| 240 | as long as there aren't name conflicts with other libraries. */ |
| 241 | |
| 242 | ps_err_e |
| 243 | ps_pglobal_lookup (gdb_ps_prochandle_t ph, |
| 244 | const char *ld_object_name, /* the library name */ |
| 245 | const char *ld_symbol_name, /* the symbol name */ |
| 246 | paddr_t *ld_symbol_addr) /* return the symbol addr */ |
| 247 | { |
| 248 | struct minimal_symbol *ms; |
| 249 | |
| 250 | ms = lookup_minimal_symbol (ld_symbol_name, NULL, NULL); |
| 251 | |
| 252 | if (!ms) |
| 253 | return PS_NOSYM; |
| 254 | |
| 255 | *ld_symbol_addr = SYMBOL_VALUE_ADDRESS (ms); |
| 256 | |
| 257 | return PS_OK; |
| 258 | } |
| 259 | |
| 260 | /* Worker function for all memory reads and writes: */ |
| 261 | static ps_err_e rw_common (const struct ps_prochandle *ph, |
| 262 | paddr_t addr, |
| 263 | char *buf, |
| 264 | int size, |
| 265 | int write_p); |
| 266 | |
| 267 | /* target_xfer_memory direction consts */ |
| 268 | enum {PS_READ = 0, PS_WRITE = 1}; |
| 269 | |
| 270 | ps_err_e |
| 271 | ps_pdread (gdb_ps_prochandle_t ph, /* read from data segment */ |
| 272 | paddr_t addr, |
| 273 | gdb_ps_read_buf_t buf, |
| 274 | gdb_ps_size_t size) |
| 275 | { |
| 276 | return rw_common (ph, addr, buf, size, PS_READ); |
| 277 | } |
| 278 | |
| 279 | ps_err_e |
| 280 | ps_pdwrite (gdb_ps_prochandle_t ph, /* write to data segment */ |
| 281 | paddr_t addr, |
| 282 | gdb_ps_write_buf_t buf, |
| 283 | gdb_ps_size_t size) |
| 284 | { |
| 285 | return rw_common (ph, addr, (char *) buf, size, PS_WRITE); |
| 286 | } |
| 287 | |
| 288 | ps_err_e |
| 289 | ps_ptread (gdb_ps_prochandle_t ph, /* read from text segment */ |
| 290 | paddr_t addr, |
| 291 | gdb_ps_read_buf_t buf, |
| 292 | gdb_ps_size_t size) |
| 293 | { |
| 294 | return rw_common (ph, addr, buf, size, PS_READ); |
| 295 | } |
| 296 | |
| 297 | ps_err_e |
| 298 | ps_ptwrite (gdb_ps_prochandle_t ph, /* write to text segment */ |
| 299 | paddr_t addr, |
| 300 | gdb_ps_write_buf_t buf, |
| 301 | gdb_ps_size_t size) |
| 302 | { |
| 303 | return rw_common (ph, addr, (char *) buf, size, PS_WRITE); |
| 304 | } |
| 305 | |
| 306 | static struct cleanup *save_inferior_pid (void); |
| 307 | static void restore_inferior_pid (void *saved_pid); |
| 308 | static char *thr_err_string (td_err_e); |
| 309 | static char *thr_state_string (td_thr_state_e); |
| 310 | |
| 311 | struct ps_prochandle { |
| 312 | int pid; |
| 313 | }; |
| 314 | |
| 315 | struct ps_prochandle main_prochandle; |
| 316 | td_thragent_t * main_threadagent; |
| 317 | |
| 318 | /* |
| 319 | * Common proc_service routine for reading and writing memory. |
| 320 | */ |
| 321 | |
| 322 | /* FIXME: once we've munged the inferior_pid, why can't we |
| 323 | simply call target_read/write_memory and return? */ |
| 324 | |
| 325 | |
| 326 | static ps_err_e |
| 327 | rw_common (const struct ps_prochandle *ph, |
| 328 | paddr_t addr, |
| 329 | char *buf, |
| 330 | int size, |
| 331 | int write_p) |
| 332 | { |
| 333 | struct cleanup *old_chain = save_inferior_pid (); |
| 334 | int to_do = size; |
| 335 | int done = 0; |
| 336 | |
| 337 | inferior_pid = main_prochandle.pid; |
| 338 | |
| 339 | while (to_do > 0) |
| 340 | { |
| 341 | done = current_target.to_xfer_memory (addr, buf, size, write_p, |
| 342 | ¤t_target); |
| 343 | if (done <= 0) |
| 344 | { |
| 345 | if (write_p == PS_READ) |
| 346 | print_sys_errmsg ("rw_common (): read", errno); |
| 347 | else |
| 348 | print_sys_errmsg ("rw_common (): write", errno); |
| 349 | |
| 350 | return PS_ERR; |
| 351 | } |
| 352 | to_do -= done; |
| 353 | buf += done; |
| 354 | } |
| 355 | do_cleanups (old_chain); |
| 356 | return PS_OK; |
| 357 | } |
| 358 | |
| 359 | /* Cleanup functions used by the register callbacks |
| 360 | (which have to manipulate the global inferior_pid). */ |
| 361 | |
| 362 | ps_err_e |
| 363 | ps_lgetregs (gdb_ps_prochandle_t ph, /* Get LWP general regs */ |
| 364 | lwpid_t lwpid, |
| 365 | prgregset_t gregset) |
| 366 | { |
| 367 | struct cleanup *old_chain = save_inferior_pid (); |
| 368 | |
| 369 | inferior_pid = BUILD_LWP (lwpid, main_prochandle.pid); |
| 370 | current_target.to_fetch_registers (-1); |
| 371 | |
| 372 | fill_gregset (gregset, -1); |
| 373 | do_cleanups (old_chain); |
| 374 | |
| 375 | return PS_OK; |
| 376 | } |
| 377 | |
| 378 | ps_err_e |
| 379 | ps_lsetregs (gdb_ps_prochandle_t ph, /* Set LWP general regs */ |
| 380 | lwpid_t lwpid, |
| 381 | const prgregset_t gregset) |
| 382 | { |
| 383 | struct cleanup *old_chain = save_inferior_pid (); |
| 384 | |
| 385 | inferior_pid = BUILD_LWP (lwpid, main_prochandle.pid); |
| 386 | supply_gregset (gregset); |
| 387 | current_target.to_store_registers (-1); |
| 388 | do_cleanups (old_chain); |
| 389 | return PS_OK; |
| 390 | } |
| 391 | |
| 392 | ps_err_e |
| 393 | ps_lgetfpregs (gdb_ps_prochandle_t ph, /* Get LWP float regs */ |
| 394 | lwpid_t lwpid, |
| 395 | prfpregset_t *fpregset) |
| 396 | { |
| 397 | struct cleanup *old_chain = save_inferior_pid (); |
| 398 | |
| 399 | inferior_pid = BUILD_LWP (lwpid, main_prochandle.pid); |
| 400 | current_target.to_fetch_registers (-1); |
| 401 | fill_fpregset (fpregset, -1); |
| 402 | do_cleanups (old_chain); |
| 403 | return PS_OK; |
| 404 | } |
| 405 | |
| 406 | ps_err_e |
| 407 | ps_lsetfpregs (gdb_ps_prochandle_t ph, /* Set LWP float regs */ |
| 408 | lwpid_t lwpid, |
| 409 | const prfpregset_t *fpregset) |
| 410 | { |
| 411 | struct cleanup *old_chain = save_inferior_pid (); |
| 412 | |
| 413 | inferior_pid = BUILD_LWP (lwpid, main_prochandle.pid); |
| 414 | supply_fpregset (fpregset); |
| 415 | current_target.to_store_registers (-1); |
| 416 | do_cleanups (old_chain); |
| 417 | return PS_OK; |
| 418 | } |
| 419 | |
| 420 | /* |
| 421 | * ps_getpid |
| 422 | * |
| 423 | * return the main pid for the child process |
| 424 | * (special for Linux -- not used on Solaris) |
| 425 | */ |
| 426 | |
| 427 | pid_t |
| 428 | ps_getpid (gdb_ps_prochandle_t ph) |
| 429 | { |
| 430 | return ph->pid; |
| 431 | } |
| 432 | |
| 433 | #ifdef TM_I386SOL2_H |
| 434 | |
| 435 | /* Reads the local descriptor table of a LWP. */ |
| 436 | |
| 437 | ps_err_e |
| 438 | ps_lgetLDT (gdb_ps_prochandle_t ph, lwpid_t lwpid, |
| 439 | struct ssd *pldt) |
| 440 | { |
| 441 | /* NOTE: only used on Solaris, therefore OK to refer to procfs.c */ |
| 442 | extern struct ssd *procfs_find_LDT_entry (int); |
| 443 | struct ssd *ret; |
| 444 | |
| 445 | ret = procfs_find_LDT_entry (BUILD_LWP (lwpid, |
| 446 | PIDGET (main_prochandle.pid))); |
| 447 | if (ret) |
| 448 | { |
| 449 | memcpy (pldt, ret, sizeof (struct ssd)); |
| 450 | return PS_OK; |
| 451 | } |
| 452 | else /* LDT not found. */ |
| 453 | return PS_ERR; |
| 454 | } |
| 455 | #endif /* TM_I386SOL2_H */ |
| 456 | |
| 457 | /* |
| 458 | * Pointers to thread_db functions: |
| 459 | * |
| 460 | * These are a dynamic library mechanism. |
| 461 | * The dlfcn.h interface will be used to initialize these |
| 462 | * so that they point to the appropriate functions in the |
| 463 | * thread_db dynamic library. This is done dynamically |
| 464 | * so that GDB can still run on systems that lack thread_db. |
| 465 | */ |
| 466 | |
| 467 | static td_err_e (*p_td_init) (void); |
| 468 | |
| 469 | static td_err_e (*p_td_ta_new) (const struct ps_prochandle *ph_p, |
| 470 | td_thragent_t **ta_pp); |
| 471 | |
| 472 | static td_err_e (*p_td_ta_delete) (td_thragent_t *ta_p); |
| 473 | |
| 474 | static td_err_e (*p_td_ta_get_nthreads) (const td_thragent_t *ta_p, |
| 475 | int *nthread_p); |
| 476 | |
| 477 | |
| 478 | static td_err_e (*p_td_ta_thr_iter) (const td_thragent_t *ta_p, |
| 479 | td_thr_iter_f *cb, |
| 480 | void *cbdata_p, |
| 481 | td_thr_state_e state, |
| 482 | int ti_pri, |
| 483 | sigset_t *ti_sigmask_p, |
| 484 | unsigned ti_user_flags); |
| 485 | |
| 486 | static td_err_e (*p_td_ta_event_addr) (const td_thragent_t *ta_p, |
| 487 | u_long event, |
| 488 | td_notify_t *notify_p); |
| 489 | |
| 490 | static td_err_e (*p_td_ta_event_getmsg) (const td_thragent_t *ta_p, |
| 491 | td_event_msg_t *msg); |
| 492 | |
| 493 | static td_err_e (*p_td_ta_set_event) (const td_thragent_t *ta_p, |
| 494 | td_thr_events_t *events); |
| 495 | |
| 496 | static td_err_e (*p_td_thr_validate) (const td_thrhandle_t *th_p); |
| 497 | |
| 498 | static td_err_e (*p_td_thr_event_enable) (const td_thrhandle_t *th_p, |
| 499 | int on_off); |
| 500 | |
| 501 | static td_err_e (*p_td_thr_get_info) (const td_thrhandle_t *th_p, |
| 502 | td_thrinfo_t *ti_p); |
| 503 | |
| 504 | static td_err_e (*p_td_thr_getgregs) (const td_thrhandle_t *th_p, |
| 505 | prgregset_t regset); |
| 506 | |
| 507 | static td_err_e (*p_td_thr_setgregs) (const td_thrhandle_t *th_p, |
| 508 | const prgregset_t regset); |
| 509 | |
| 510 | static td_err_e (*p_td_thr_getfpregs) (const td_thrhandle_t *th_p, |
| 511 | prfpregset_t *fpregset); |
| 512 | |
| 513 | static td_err_e (*p_td_thr_setfpregs) (const td_thrhandle_t *th_p, |
| 514 | const prfpregset_t *fpregset); |
| 515 | |
| 516 | static td_err_e (*p_td_ta_map_id2thr) (const td_thragent_t *ta_p, |
| 517 | thread_t tid, |
| 518 | td_thrhandle_t *th_p); |
| 519 | |
| 520 | static td_err_e (*p_td_ta_map_lwp2thr) (const td_thragent_t *ta_p, |
| 521 | lwpid_t lwpid, |
| 522 | td_thrhandle_t *th_p); |
| 523 | |
| 524 | /* |
| 525 | * API and target vector initialization function: thread_db_initialize. |
| 526 | * |
| 527 | * NOTE: this function is deliberately NOT named with the GDB convention |
| 528 | * of module initializer function names that begin with "_initialize". |
| 529 | * This module is NOT intended to be auto-initialized at GDB startup. |
| 530 | * Rather, it will only be initialized when a multi-threaded child |
| 531 | * process is detected. |
| 532 | * |
| 533 | */ |
| 534 | |
| 535 | /* |
| 536 | * Initializer for thread_db library interface. |
| 537 | * This function does the dynamic library stuff (dlopen, dlsym), |
| 538 | * and then calls the thread_db library's one-time initializer |
| 539 | * function (td_init). If everything succeeds, this function |
| 540 | * returns true; otherwise it returns false, and this module |
| 541 | * cannot be used. |
| 542 | */ |
| 543 | |
| 544 | static int |
| 545 | init_thread_db_library () |
| 546 | { |
| 547 | void *dlhandle; |
| 548 | td_err_e ret; |
| 549 | |
| 550 | /* Open a handle to the "thread_db" dynamic library. */ |
| 551 | if ((dlhandle = dlopen ("libthread_db.so.1", RTLD_NOW)) == NULL) |
| 552 | return 0; /* fail */ |
| 553 | |
| 554 | /* Initialize pointers to the dynamic library functions we will use. |
| 555 | * Note that we are not calling the functions here -- we are only |
| 556 | * establishing pointers to them. |
| 557 | */ |
| 558 | |
| 559 | /* td_init: initialize thread_db library. */ |
| 560 | if ((p_td_init = dlsym (dlhandle, "td_init")) == NULL) |
| 561 | return 0; /* fail */ |
| 562 | /* td_ta_new: register a target process with thread_db. */ |
| 563 | if ((p_td_ta_new = dlsym (dlhandle, "td_ta_new")) == NULL) |
| 564 | return 0; /* fail */ |
| 565 | /* td_ta_delete: un-register a target process with thread_db. */ |
| 566 | if ((p_td_ta_delete = dlsym (dlhandle, "td_ta_delete")) == NULL) |
| 567 | return 0; /* fail */ |
| 568 | |
| 569 | /* td_ta_map_id2thr: get thread handle from thread id. */ |
| 570 | if ((p_td_ta_map_id2thr = dlsym (dlhandle, "td_ta_map_id2thr")) == NULL) |
| 571 | return 0; /* fail */ |
| 572 | /* td_ta_map_lwp2thr: get thread handle from lwp id. */ |
| 573 | if ((p_td_ta_map_lwp2thr = dlsym (dlhandle, "td_ta_map_lwp2thr")) == NULL) |
| 574 | return 0; /* fail */ |
| 575 | /* td_ta_get_nthreads: get number of threads in target process. */ |
| 576 | if ((p_td_ta_get_nthreads = dlsym (dlhandle, "td_ta_get_nthreads")) == NULL) |
| 577 | return 0; /* fail */ |
| 578 | /* td_ta_thr_iter: iterate over all thread handles. */ |
| 579 | if ((p_td_ta_thr_iter = dlsym (dlhandle, "td_ta_thr_iter")) == NULL) |
| 580 | return 0; /* fail */ |
| 581 | |
| 582 | /* td_thr_validate: make sure a thread handle is real and alive. */ |
| 583 | if ((p_td_thr_validate = dlsym (dlhandle, "td_thr_validate")) == NULL) |
| 584 | return 0; /* fail */ |
| 585 | /* td_thr_get_info: get a bunch of info about a thread. */ |
| 586 | if ((p_td_thr_get_info = dlsym (dlhandle, "td_thr_get_info")) == NULL) |
| 587 | return 0; /* fail */ |
| 588 | /* td_thr_getgregs: get general registers for thread. */ |
| 589 | if ((p_td_thr_getgregs = dlsym (dlhandle, "td_thr_getgregs")) == NULL) |
| 590 | return 0; /* fail */ |
| 591 | /* td_thr_setgregs: set general registers for thread. */ |
| 592 | if ((p_td_thr_setgregs = dlsym (dlhandle, "td_thr_setgregs")) == NULL) |
| 593 | return 0; /* fail */ |
| 594 | /* td_thr_getfpregs: get floating point registers for thread. */ |
| 595 | if ((p_td_thr_getfpregs = dlsym (dlhandle, "td_thr_getfpregs")) == NULL) |
| 596 | return 0; /* fail */ |
| 597 | /* td_thr_setfpregs: set floating point registers for thread. */ |
| 598 | if ((p_td_thr_setfpregs = dlsym (dlhandle, "td_thr_setfpregs")) == NULL) |
| 599 | return 0; /* fail */ |
| 600 | |
| 601 | ret = p_td_init (); |
| 602 | if (ret != TD_OK) |
| 603 | { |
| 604 | warning ("init_thread_db: td_init: %s", thr_err_string (ret)); |
| 605 | return 0; |
| 606 | } |
| 607 | |
| 608 | /* Optional functions: |
| 609 | We can still debug even if the following functions are not found. */ |
| 610 | |
| 611 | /* td_ta_event_addr: get the breakpoint address for specified event. */ |
| 612 | p_td_ta_event_addr = dlsym (dlhandle, "td_ta_event_addr"); |
| 613 | |
| 614 | /* td_ta_event_getmsg: get the next event message for the process. */ |
| 615 | p_td_ta_event_getmsg = dlsym (dlhandle, "td_ta_event_getmsg"); |
| 616 | |
| 617 | /* td_ta_set_event: request notification of an event. */ |
| 618 | p_td_ta_set_event = dlsym (dlhandle, "td_ta_set_event"); |
| 619 | |
| 620 | /* td_thr_event_enable: enable event reporting in a thread. */ |
| 621 | p_td_thr_event_enable = dlsym (dlhandle, "td_thr_event_enable"); |
| 622 | |
| 623 | return 1; /* success */ |
| 624 | } |
| 625 | |
| 626 | /* |
| 627 | * Local utility functions: |
| 628 | */ |
| 629 | |
| 630 | |
| 631 | /* |
| 632 | |
| 633 | LOCAL FUNCTION |
| 634 | |
| 635 | save_inferior_pid - Save inferior_pid on the cleanup list |
| 636 | restore_inferior_pid - Restore inferior_pid from the cleanup list |
| 637 | |
| 638 | SYNOPSIS |
| 639 | |
| 640 | struct cleanup *save_inferior_pid (void); |
| 641 | void restore_inferior_pid (void *saved_pid); |
| 642 | |
| 643 | DESCRIPTION |
| 644 | |
| 645 | These two functions act in unison to restore inferior_pid in |
| 646 | case of an error. |
| 647 | |
| 648 | NOTES |
| 649 | |
| 650 | inferior_pid is a global variable that needs to be changed by many |
| 651 | of these routines before calling functions in procfs.c. In order |
| 652 | to guarantee that inferior_pid gets restored (in case of errors), |
| 653 | you need to call save_inferior_pid before changing it. At the end |
| 654 | of the function, you should invoke do_cleanups to restore it. |
| 655 | |
| 656 | */ |
| 657 | |
| 658 | static struct cleanup * |
| 659 | save_inferior_pid (void) |
| 660 | { |
| 661 | int *saved_pid_ptr; |
| 662 | |
| 663 | saved_pid_ptr = xmalloc (sizeof (int)); |
| 664 | *saved_pid_ptr = inferior_pid; |
| 665 | return make_cleanup (restore_inferior_pid, saved_pid_ptr); |
| 666 | } |
| 667 | |
| 668 | static void |
| 669 | restore_inferior_pid (void *arg) |
| 670 | { |
| 671 | int *saved_pid_ptr = arg; |
| 672 | inferior_pid = *saved_pid_ptr; |
| 673 | free (arg); |
| 674 | } |
| 675 | |
| 676 | /* |
| 677 | |
| 678 | LOCAL FUNCTION |
| 679 | |
| 680 | thr_err_string - Convert a thread_db error code to a string |
| 681 | |
| 682 | SYNOPSIS |
| 683 | |
| 684 | char * thr_err_string (errcode) |
| 685 | |
| 686 | DESCRIPTION |
| 687 | |
| 688 | Return a string description of the thread_db errcode. If errcode |
| 689 | is unknown, then return an <unknown> message. |
| 690 | |
| 691 | */ |
| 692 | |
| 693 | static char * |
| 694 | thr_err_string (errcode) |
| 695 | td_err_e errcode; |
| 696 | { |
| 697 | static char buf[50]; |
| 698 | |
| 699 | switch (errcode) { |
| 700 | case TD_OK: return "generic 'call succeeded'"; |
| 701 | case TD_ERR: return "generic error"; |
| 702 | case TD_NOTHR: return "no thread to satisfy query"; |
| 703 | case TD_NOSV: return "no sync handle to satisfy query"; |
| 704 | case TD_NOLWP: return "no lwp to satisfy query"; |
| 705 | case TD_BADPH: return "invalid process handle"; |
| 706 | case TD_BADTH: return "invalid thread handle"; |
| 707 | case TD_BADSH: return "invalid synchronization handle"; |
| 708 | case TD_BADTA: return "invalid thread agent"; |
| 709 | case TD_BADKEY: return "invalid key"; |
| 710 | case TD_NOMSG: return "no event message for getmsg"; |
| 711 | case TD_NOFPREGS: return "FPU register set not available"; |
| 712 | case TD_NOLIBTHREAD: return "application not linked with libthread"; |
| 713 | case TD_NOEVENT: return "requested event is not supported"; |
| 714 | case TD_NOCAPAB: return "capability not available"; |
| 715 | case TD_DBERR: return "debugger service failed"; |
| 716 | case TD_NOAPLIC: return "operation not applicable to"; |
| 717 | case TD_NOTSD: return "no thread-specific data for this thread"; |
| 718 | case TD_MALLOC: return "malloc failed"; |
| 719 | case TD_PARTIALREG: return "only part of register set was written/read"; |
| 720 | case TD_NOXREGS: return "X register set not available for this thread"; |
| 721 | default: |
| 722 | sprintf (buf, "unknown thread_db error '%d'", errcode); |
| 723 | return buf; |
| 724 | } |
| 725 | } |
| 726 | |
| 727 | /* |
| 728 | |
| 729 | LOCAL FUNCTION |
| 730 | |
| 731 | thr_state_string - Convert a thread_db state code to a string |
| 732 | |
| 733 | SYNOPSIS |
| 734 | |
| 735 | char *thr_state_string (statecode) |
| 736 | |
| 737 | DESCRIPTION |
| 738 | |
| 739 | Return the thread_db state string associated with statecode. |
| 740 | If statecode is unknown, then return an <unknown> message. |
| 741 | |
| 742 | */ |
| 743 | |
| 744 | static char * |
| 745 | thr_state_string (statecode) |
| 746 | td_thr_state_e statecode; |
| 747 | { |
| 748 | static char buf[50]; |
| 749 | |
| 750 | switch (statecode) { |
| 751 | case TD_THR_STOPPED: return "stopped by debugger"; |
| 752 | case TD_THR_RUN: return "runnable"; |
| 753 | case TD_THR_ACTIVE: return "active"; |
| 754 | case TD_THR_ZOMBIE: return "zombie"; |
| 755 | case TD_THR_SLEEP: return "sleeping"; |
| 756 | case TD_THR_STOPPED_ASLEEP: return "stopped by debugger AND blocked"; |
| 757 | default: |
| 758 | sprintf (buf, "unknown thread_db state %d", statecode); |
| 759 | return buf; |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | /* |
| 764 | * Local thread/event list. |
| 765 | * This data structure will be used to hold a list of threads and |
| 766 | * pending/deliverable events. |
| 767 | */ |
| 768 | |
| 769 | typedef struct THREADINFO { |
| 770 | thread_t tid; /* thread ID */ |
| 771 | pid_t lid; /* process/lwp ID */ |
| 772 | td_thr_state_e state; /* thread state (a la thread_db) */ |
| 773 | td_thr_type_e type; /* thread type (a la thread_db) */ |
| 774 | int pending; /* true if holding a pending event */ |
| 775 | int status; /* wait status of any interesting event */ |
| 776 | } threadinfo; |
| 777 | |
| 778 | threadinfo * threadlist; |
| 779 | int threadlist_max = 0; /* current size of table */ |
| 780 | int threadlist_top = 0; /* number of threads now in table */ |
| 781 | #define THREADLIST_ALLOC 100 /* chunk size by which to expand table */ |
| 782 | |
| 783 | static threadinfo * |
| 784 | insert_thread (tid, lid, state, type) |
| 785 | int tid; |
| 786 | int lid; |
| 787 | td_thr_state_e state; |
| 788 | td_thr_type_e type; |
| 789 | { |
| 790 | if (threadlist_top >= threadlist_max) |
| 791 | { |
| 792 | threadlist_max += THREADLIST_ALLOC; |
| 793 | threadlist = realloc (threadlist, |
| 794 | threadlist_max * sizeof (threadinfo)); |
| 795 | if (threadlist == NULL) |
| 796 | return NULL; |
| 797 | } |
| 798 | threadlist[threadlist_top].tid = tid; |
| 799 | threadlist[threadlist_top].lid = lid; |
| 800 | threadlist[threadlist_top].state = state; |
| 801 | threadlist[threadlist_top].type = type; |
| 802 | threadlist[threadlist_top].pending = 0; |
| 803 | threadlist[threadlist_top].status = 0; |
| 804 | |
| 805 | return &threadlist[threadlist_top++]; |
| 806 | } |
| 807 | |
| 808 | static void |
| 809 | empty_threadlist () |
| 810 | { |
| 811 | threadlist_top = 0; |
| 812 | } |
| 813 | |
| 814 | static threadinfo * |
| 815 | next_pending_event () |
| 816 | { |
| 817 | int i; |
| 818 | |
| 819 | for (i = 0; i < threadlist_top; i++) |
| 820 | if (threadlist[i].pending) |
| 821 | return &threadlist[i]; |
| 822 | |
| 823 | return NULL; |
| 824 | } |
| 825 | |
| 826 | static void |
| 827 | threadlist_iter (func, data, state, type) |
| 828 | int (*func) (); |
| 829 | void *data; |
| 830 | td_thr_state_e state; |
| 831 | td_thr_type_e type; |
| 832 | { |
| 833 | int i; |
| 834 | |
| 835 | for (i = 0; i < threadlist_top; i++) |
| 836 | if ((state == TD_THR_ANY_STATE || state == threadlist[i].state) && |
| 837 | (type == TD_THR_ANY_TYPE || type == threadlist[i].type)) |
| 838 | if ((*func) (&threadlist[i], data) != 0) |
| 839 | break; |
| 840 | |
| 841 | return; |
| 842 | } |
| 843 | |
| 844 | /* |
| 845 | * Global state |
| 846 | * |
| 847 | * Here we keep state information all collected in one place. |
| 848 | */ |
| 849 | |
| 850 | /* This flag is set when we activate, so that we don't do it twice. |
| 851 | Defined in linux-thread.c and used for inter-target syncronization. */ |
| 852 | extern int using_thread_db; |
| 853 | |
| 854 | /* The process id for which we've stopped. |
| 855 | * This is only set when we actually stop all threads. |
| 856 | * Otherwise it's zero. |
| 857 | */ |
| 858 | static int event_pid; |
| 859 | |
| 860 | /* |
| 861 | * The process id for a new thread to which we've just attached. |
| 862 | * This process needs special handling at resume time. |
| 863 | */ |
| 864 | static int attach_pid; |
| 865 | |
| 866 | |
| 867 | /* |
| 868 | * thread_db event handling: |
| 869 | * |
| 870 | * The mechanism for event notification via the thread_db API. |
| 871 | * These events are implemented as breakpoints. The thread_db |
| 872 | * library gives us an address where we can set a breakpoint. |
| 873 | * When the breakpoint is hit, it represents an event of interest |
| 874 | * such as: |
| 875 | * Thread creation |
| 876 | * Thread death |
| 877 | * Thread reap |
| 878 | */ |
| 879 | |
| 880 | /* Location of the thread creation event breakpoint. The code at this |
| 881 | location in the child process will be called by the pthread library |
| 882 | whenever a new thread is created. By setting a special breakpoint |
| 883 | at this location, GDB can detect when a new thread is created. We |
| 884 | obtain this location via the td_ta_event_addr call. */ |
| 885 | |
| 886 | static CORE_ADDR thread_creation_bkpt_address; |
| 887 | |
| 888 | /* Location of the thread death event breakpoint. The code at this |
| 889 | location in the child process will be called by the pthread library |
| 890 | whenever a thread is destroyed. By setting a special breakpoint at |
| 891 | this location, GDB can detect when a new thread is created. We |
| 892 | obtain this location via the td_ta_event_addr call. */ |
| 893 | |
| 894 | static CORE_ADDR thread_death_bkpt_address; |
| 895 | |
| 896 | /* This function handles the global parts of enabling thread events. |
| 897 | The thread-specific enabling is handled per-thread elsewhere. */ |
| 898 | |
| 899 | static void |
| 900 | enable_thread_event_reporting (ta) |
| 901 | td_thragent_t *ta; |
| 902 | { |
| 903 | td_thr_events_t events; |
| 904 | td_notify_t notify; |
| 905 | CORE_ADDR addr; |
| 906 | |
| 907 | if (p_td_ta_set_event == NULL || |
| 908 | p_td_ta_event_addr == NULL || |
| 909 | p_td_ta_event_getmsg == NULL || |
| 910 | p_td_thr_event_enable == NULL) |
| 911 | return; /* can't do thread event reporting without these funcs */ |
| 912 | |
| 913 | /* set process wide mask saying which events we are interested in */ |
| 914 | td_event_emptyset (&events); |
| 915 | td_event_addset (&events, TD_CREATE); |
| 916 | td_event_addset (&events, TD_DEATH); |
| 917 | |
| 918 | if (p_td_ta_set_event (ta, &events) != TD_OK) |
| 919 | { |
| 920 | warning ("unable to set global thread event mask"); |
| 921 | return; |
| 922 | } |
| 923 | |
| 924 | /* Delete previous thread event breakpoints, if any. */ |
| 925 | remove_thread_event_breakpoints (); |
| 926 | |
| 927 | /* create breakpoints -- thread creation and death */ |
| 928 | /* thread creation */ |
| 929 | /* get breakpoint location */ |
| 930 | if (p_td_ta_event_addr (ta, TD_CREATE, ¬ify) != TD_OK) |
| 931 | { |
| 932 | warning ("unable to get location for thread creation breakpoint"); |
| 933 | return; |
| 934 | } |
| 935 | |
| 936 | /* Set up the breakpoint. */ |
| 937 | create_thread_event_breakpoint (notify.u.bptaddr); |
| 938 | |
| 939 | /* Save it's location. */ |
| 940 | thread_creation_bkpt_address = notify.u.bptaddr; |
| 941 | |
| 942 | /* thread death */ |
| 943 | /* get breakpoint location */ |
| 944 | if (p_td_ta_event_addr (ta, TD_DEATH, ¬ify) != TD_OK) |
| 945 | { |
| 946 | warning ("unable to get location for thread death breakpoint"); |
| 947 | return; |
| 948 | } |
| 949 | /* Set up the breakpoint. */ |
| 950 | create_thread_event_breakpoint (notify.u.bptaddr); |
| 951 | |
| 952 | /* Save it's location. */ |
| 953 | thread_death_bkpt_address = notify.u.bptaddr; |
| 954 | } |
| 955 | |
| 956 | /* This function handles the global parts of disabling thread events. |
| 957 | The thread-specific enabling is handled per-thread elsewhere. */ |
| 958 | |
| 959 | static void |
| 960 | disable_thread_event_reporting (ta) |
| 961 | td_thragent_t *ta; |
| 962 | { |
| 963 | td_thr_events_t events; |
| 964 | |
| 965 | /* set process wide mask saying we aren't interested in any events */ |
| 966 | td_event_emptyset (&events); |
| 967 | p_td_ta_set_event (main_threadagent, &events); |
| 968 | |
| 969 | /* Delete thread event breakpoints, if any. */ |
| 970 | remove_thread_event_breakpoints (); |
| 971 | thread_creation_bkpt_address = 0; |
| 972 | thread_death_bkpt_address = 0; |
| 973 | } |
| 974 | |
| 975 | /* check_for_thread_event |
| 976 | |
| 977 | if it's a thread event we recognize (currently |
| 978 | we only recognize creation and destruction |
| 979 | events), return 1; else return 0. */ |
| 980 | |
| 981 | |
| 982 | static int |
| 983 | check_for_thread_event (struct target_waitstatus *tws, int event_pid) |
| 984 | { |
| 985 | /* FIXME: to be more efficient, we should keep a static |
| 986 | list of threads, and update it only here (with td_ta_thr_iter). */ |
| 987 | } |
| 988 | |
| 989 | static void |
| 990 | thread_db_push_target (void) |
| 991 | { |
| 992 | /* Called ONLY from thread_db_new_objfile after td_ta_new call succeeds. */ |
| 993 | |
| 994 | /* Push this target vector */ |
| 995 | push_target (&thread_db_ops); |
| 996 | /* Find the underlying process-layer target for calling later. */ |
| 997 | target_beneath = find_target_beneath (&thread_db_ops); |
| 998 | using_thread_db = 1; |
| 999 | /* Turn on thread_db event-reporting API. */ |
| 1000 | enable_thread_event_reporting (main_threadagent); |
| 1001 | } |
| 1002 | |
| 1003 | static void |
| 1004 | thread_db_unpush_target (void) |
| 1005 | { |
| 1006 | /* Must be called whenever we remove ourself from the target stack! */ |
| 1007 | |
| 1008 | using_thread_db = 0; |
| 1009 | target_beneath = NULL; |
| 1010 | |
| 1011 | /* delete local list of threads */ |
| 1012 | empty_threadlist (); |
| 1013 | /* Turn off the thread_db API. */ |
| 1014 | p_td_ta_delete (main_threadagent); |
| 1015 | /* Unpush this target vector */ |
| 1016 | unpush_target (&thread_db_ops); |
| 1017 | /* Reset linuxthreads module. */ |
| 1018 | linuxthreads_discard_global_state (); |
| 1019 | } |
| 1020 | |
| 1021 | /* |
| 1022 | * New objfile hook function: |
| 1023 | * Called for each new objfile (image, shared lib) in the target process. |
| 1024 | * |
| 1025 | * The purpose of this function is to detect that the target process |
| 1026 | * is linked with the (appropriate) thread library. So every time a |
| 1027 | * new target shared library is detected, we will call td_ta_new. |
| 1028 | * If it succeeds, we know we have a multi-threaded target process |
| 1029 | * that we can debug using the thread_db API. |
| 1030 | */ |
| 1031 | |
| 1032 | /* |
| 1033 | * new_objfile function: |
| 1034 | * |
| 1035 | * connected to target_new_objfile_hook, this function gets called |
| 1036 | * every time a new binary image is loaded. |
| 1037 | * |
| 1038 | * At each call, we attempt to open the thread_db connection to the |
| 1039 | * child process. If it succeeds, we know we have a libthread process |
| 1040 | * and we can debug it with this target vector. Therefore we push |
| 1041 | * ourself onto the target stack. |
| 1042 | */ |
| 1043 | |
| 1044 | static void (*target_new_objfile_chain) (struct objfile *objfile); |
| 1045 | static int stop_or_attach_thread_callback (const td_thrhandle_t *th, |
| 1046 | void *data); |
| 1047 | static int wait_thread_callback (const td_thrhandle_t *th, |
| 1048 | void *data); |
| 1049 | |
| 1050 | static void |
| 1051 | thread_db_new_objfile (struct objfile *objfile) |
| 1052 | { |
| 1053 | td_err_e ret; |
| 1054 | |
| 1055 | if (using_thread_db) /* libthread already detected, and */ |
| 1056 | goto quit; /* thread target vector activated. */ |
| 1057 | |
| 1058 | if (objfile == NULL) |
| 1059 | goto quit; /* un-interesting object file */ |
| 1060 | |
| 1061 | /* Initialize our "main prochandle" with the main inferior pid. */ |
| 1062 | main_prochandle.pid = PIDGET (inferior_pid); |
| 1063 | |
| 1064 | /* Now attempt to open a thread_db connection to the |
| 1065 | thread library running in the child process. */ |
| 1066 | ret = p_td_ta_new (&main_prochandle, &main_threadagent); |
| 1067 | switch (ret) { |
| 1068 | default: |
| 1069 | warning ("Unexpected error initializing thread_db: %s", |
| 1070 | thr_err_string (ret)); |
| 1071 | break; |
| 1072 | case TD_NOLIBTHREAD: /* expected: no libthread in child process (yet) */ |
| 1073 | break; |
| 1074 | case TD_OK: /* libthread detected in child: we go live now! */ |
| 1075 | thread_db_push_target (); |
| 1076 | event_pid = inferior_pid; /* for resume */ |
| 1077 | |
| 1078 | /* Now stop everyone else, and attach any new threads you find. */ |
| 1079 | p_td_ta_thr_iter (main_threadagent, |
| 1080 | stop_or_attach_thread_callback, |
| 1081 | (void *) 0, |
| 1082 | TD_THR_ANY_STATE, |
| 1083 | TD_THR_LOWEST_PRIORITY, |
| 1084 | TD_SIGNO_MASK, |
| 1085 | TD_THR_ANY_USER_FLAGS); |
| 1086 | |
| 1087 | /* Now go call wait on all the threads you've stopped: |
| 1088 | This allows us to absorb the SIGKILL event, and to make sure |
| 1089 | that the thread knows that it is stopped (Linux peculiarity). */ |
| 1090 | p_td_ta_thr_iter (main_threadagent, |
| 1091 | wait_thread_callback, |
| 1092 | (void *) 0, |
| 1093 | TD_THR_ANY_STATE, |
| 1094 | TD_THR_LOWEST_PRIORITY, |
| 1095 | TD_SIGNO_MASK, |
| 1096 | TD_THR_ANY_USER_FLAGS); |
| 1097 | |
| 1098 | break; |
| 1099 | } |
| 1100 | quit: |
| 1101 | if (target_new_objfile_chain) |
| 1102 | target_new_objfile_chain (objfile); |
| 1103 | } |
| 1104 | |
| 1105 | |
| 1106 | /* |
| 1107 | |
| 1108 | LOCAL FUNCTION |
| 1109 | |
| 1110 | thread_db_alive - test thread for "aliveness" |
| 1111 | |
| 1112 | SYNOPSIS |
| 1113 | |
| 1114 | static bool thread_db_alive (int pid); |
| 1115 | |
| 1116 | DESCRIPTION |
| 1117 | |
| 1118 | returns true if thread still active in inferior. |
| 1119 | |
| 1120 | */ |
| 1121 | |
| 1122 | static int |
| 1123 | thread_db_alive (pid) |
| 1124 | int pid; |
| 1125 | { |
| 1126 | if (is_thread (pid)) /* user-space (non-kernel) thread */ |
| 1127 | { |
| 1128 | td_thrhandle_t th; |
| 1129 | td_err_e ret; |
| 1130 | |
| 1131 | pid = GET_THREAD (pid); |
| 1132 | if ((ret = p_td_ta_map_id2thr (main_threadagent, pid, &th)) != TD_OK) |
| 1133 | return 0; /* thread not found */ |
| 1134 | if ((ret = p_td_thr_validate (&th)) != TD_OK) |
| 1135 | return 0; /* thread not valid */ |
| 1136 | return 1; /* known thread: return true */ |
| 1137 | } |
| 1138 | else if (target_beneath->to_thread_alive) |
| 1139 | return target_beneath->to_thread_alive (pid); |
| 1140 | else |
| 1141 | return 0; /* default to "not alive" (shouldn't happen anyway) */ |
| 1142 | } |
| 1143 | |
| 1144 | /* |
| 1145 | * get_lwp_from_thread_handle |
| 1146 | */ |
| 1147 | |
| 1148 | static int /* lwpid_t or pid_t */ |
| 1149 | get_lwp_from_thread_handle (th) |
| 1150 | td_thrhandle_t *th; |
| 1151 | { |
| 1152 | td_thrinfo_t ti; |
| 1153 | td_err_e ret; |
| 1154 | |
| 1155 | if ((ret = p_td_thr_get_info (th, &ti)) != TD_OK) |
| 1156 | error ("get_lwp_from_thread_handle: thr_get_info failed: %s", |
| 1157 | thr_err_string (ret)); |
| 1158 | |
| 1159 | return ti.ti_lid; |
| 1160 | } |
| 1161 | |
| 1162 | /* |
| 1163 | * get_lwp_from_thread_id |
| 1164 | */ |
| 1165 | |
| 1166 | static int /* lwpid_t or pid_t */ |
| 1167 | get_lwp_from_thread_id (tid) |
| 1168 | int tid; /* thread_t? */ |
| 1169 | { |
| 1170 | td_thrhandle_t th; |
| 1171 | td_err_e ret; |
| 1172 | |
| 1173 | if ((ret = p_td_ta_map_id2thr (main_threadagent, tid, &th)) != TD_OK) |
| 1174 | error ("get_lwp_from_thread_id: map_id2thr failed: %s", |
| 1175 | thr_err_string (ret)); |
| 1176 | |
| 1177 | return get_lwp_from_thread_handle (&th); |
| 1178 | } |
| 1179 | |
| 1180 | /* |
| 1181 | * pid_to_str has to handle user-space threads. |
| 1182 | * If not a user-space thread, then pass the request on to the |
| 1183 | * underlying stratum if it can handle it: else call normal_pid_to_str. |
| 1184 | */ |
| 1185 | |
| 1186 | static char * |
| 1187 | thread_db_pid_to_str (int pid) |
| 1188 | { |
| 1189 | static char buf[100]; |
| 1190 | td_thrhandle_t th; |
| 1191 | td_thrinfo_t ti; |
| 1192 | td_err_e ret; |
| 1193 | |
| 1194 | if (is_thread (pid)) |
| 1195 | { |
| 1196 | if ((ret = p_td_ta_map_id2thr (main_threadagent, |
| 1197 | GET_THREAD (pid), |
| 1198 | &th)) != TD_OK) |
| 1199 | error ("thread_db: map_id2thr failed: %s", thr_err_string (ret)); |
| 1200 | |
| 1201 | if ((ret = p_td_thr_get_info (&th, &ti)) != TD_OK) |
| 1202 | error ("thread_db: thr_get_info failed: %s", thr_err_string (ret)); |
| 1203 | |
| 1204 | if (ti.ti_state == TD_THR_ACTIVE && |
| 1205 | ti.ti_lid != 0) |
| 1206 | sprintf (buf, "Thread %d (LWP %d)", ti.ti_tid, ti.ti_lid); |
| 1207 | else |
| 1208 | sprintf (buf, "Thread %d (%s)", ti.ti_tid, |
| 1209 | thr_state_string (ti.ti_state)); |
| 1210 | } |
| 1211 | else if (GET_LWP (pid)) |
| 1212 | sprintf (buf, "LWP %d", GET_LWP (pid)); |
| 1213 | else return normal_pid_to_str (pid); |
| 1214 | |
| 1215 | return buf; |
| 1216 | } |
| 1217 | |
| 1218 | /* |
| 1219 | * thread_db target vector functions: |
| 1220 | */ |
| 1221 | |
| 1222 | static void |
| 1223 | thread_db_files_info (struct target_ops *tgt_vector) |
| 1224 | { |
| 1225 | /* This function will be unnecessary in real life. */ |
| 1226 | printf_filtered ("thread_db stratum:\n"); |
| 1227 | target_beneath->to_files_info (tgt_vector); |
| 1228 | } |
| 1229 | |
| 1230 | /* |
| 1231 | * xfer_memory has to munge the inferior_pid before passing the call |
| 1232 | * down to the target layer. |
| 1233 | */ |
| 1234 | |
| 1235 | static int |
| 1236 | thread_db_xfer_memory (memaddr, myaddr, len, dowrite, target) |
| 1237 | CORE_ADDR memaddr; |
| 1238 | char *myaddr; |
| 1239 | int len; |
| 1240 | int dowrite; |
| 1241 | struct target_ops *target; /* ignored */ |
| 1242 | { |
| 1243 | struct cleanup *old_chain; |
| 1244 | int ret; |
| 1245 | |
| 1246 | old_chain = save_inferior_pid (); |
| 1247 | |
| 1248 | if (is_thread (inferior_pid) || |
| 1249 | !target_thread_alive (inferior_pid)) |
| 1250 | { |
| 1251 | /* FIXME: use the LID/LWP, so that underlying process layer |
| 1252 | can read memory from specific threads? */ |
| 1253 | inferior_pid = main_prochandle.pid; |
| 1254 | } |
| 1255 | |
| 1256 | ret = target_beneath->to_xfer_memory (memaddr, myaddr, len, |
| 1257 | dowrite, target); |
| 1258 | do_cleanups (old_chain); |
| 1259 | return ret; |
| 1260 | } |
| 1261 | |
| 1262 | /* |
| 1263 | * fetch_registers has to determine if inferior_pid is a user-space thread. |
| 1264 | * If so, we use the thread_db API to get the registers. |
| 1265 | * And if not, we call the underlying process stratum. |
| 1266 | */ |
| 1267 | |
| 1268 | static void |
| 1269 | thread_db_fetch_registers (regno) |
| 1270 | int regno; |
| 1271 | { |
| 1272 | td_thrhandle_t thandle; |
| 1273 | prfpregset_t fpregset; |
| 1274 | prgregset_t gregset; |
| 1275 | thread_t thread; |
| 1276 | td_err_e ret; |
| 1277 | |
| 1278 | if (!is_thread (inferior_pid)) /* kernel thread */ |
| 1279 | { /* pass the request on to the target underneath. */ |
| 1280 | target_beneath->to_fetch_registers (regno); |
| 1281 | return; |
| 1282 | } |
| 1283 | |
| 1284 | /* convert inferior_pid into a td_thrhandle_t */ |
| 1285 | |
| 1286 | if ((thread = GET_THREAD (inferior_pid)) == 0) |
| 1287 | error ("fetch_registers: thread == 0"); |
| 1288 | |
| 1289 | if ((ret = p_td_ta_map_id2thr (main_threadagent, thread, &thandle)) != TD_OK) |
| 1290 | error ("fetch_registers: td_ta_map_id2thr: %s", thr_err_string (ret)); |
| 1291 | |
| 1292 | /* Get the integer regs: |
| 1293 | For the sparc, TD_PARTIALREG means that only i0->i7, l0->l7, |
| 1294 | pc and sp are saved (by a thread context switch). */ |
| 1295 | if ((ret = p_td_thr_getgregs (&thandle, gregset)) != TD_OK && |
| 1296 | ret != TD_PARTIALREG) |
| 1297 | error ("fetch_registers: td_thr_getgregs %s", thr_err_string (ret)); |
| 1298 | |
| 1299 | /* And, now the fp regs */ |
| 1300 | if ((ret = p_td_thr_getfpregs (&thandle, &fpregset)) != TD_OK && |
| 1301 | ret != TD_NOFPREGS) |
| 1302 | error ("fetch_registers: td_thr_getfpregs %s", thr_err_string (ret)); |
| 1303 | |
| 1304 | /* Note that we must call supply_{g fp}regset *after* calling the td routines |
| 1305 | because the td routines call ps_lget* which affect the values stored in the |
| 1306 | registers array. */ |
| 1307 | |
| 1308 | supply_gregset (gregset); |
| 1309 | supply_fpregset (&fpregset); |
| 1310 | |
| 1311 | } |
| 1312 | |
| 1313 | /* |
| 1314 | * store_registers has to determine if inferior_pid is a user-space thread. |
| 1315 | * If so, we use the thread_db API to get the registers. |
| 1316 | * And if not, we call the underlying process stratum. |
| 1317 | */ |
| 1318 | |
| 1319 | static void |
| 1320 | thread_db_store_registers (regno) |
| 1321 | int regno; |
| 1322 | { |
| 1323 | td_thrhandle_t thandle; |
| 1324 | prfpregset_t fpregset; |
| 1325 | prgregset_t gregset; |
| 1326 | thread_t thread; |
| 1327 | td_err_e ret; |
| 1328 | |
| 1329 | if (!is_thread (inferior_pid)) /* Kernel thread: */ |
| 1330 | { /* pass the request on to the underlying target vector. */ |
| 1331 | target_beneath->to_store_registers (regno); |
| 1332 | return; |
| 1333 | } |
| 1334 | |
| 1335 | /* convert inferior_pid into a td_thrhandle_t */ |
| 1336 | |
| 1337 | if ((thread = GET_THREAD (inferior_pid)) == 0) |
| 1338 | error ("store_registers: thread == 0"); |
| 1339 | |
| 1340 | if ((ret = p_td_ta_map_id2thr (main_threadagent, thread, &thandle)) != TD_OK) |
| 1341 | error ("store_registers: td_ta_map_id2thr %s", thr_err_string (ret)); |
| 1342 | |
| 1343 | if (regno != -1) |
| 1344 | { /* Not writing all the regs */ |
| 1345 | /* save new register value */ |
| 1346 | /* MVS: I don't understand this... */ |
| 1347 | char old_value[REGISTER_SIZE]; |
| 1348 | |
| 1349 | memcpy (old_value, ®isters[REGISTER_BYTE (regno)], REGISTER_SIZE); |
| 1350 | |
| 1351 | if ((ret = p_td_thr_getgregs (&thandle, gregset)) != TD_OK) |
| 1352 | error ("store_registers: td_thr_getgregs %s", thr_err_string (ret)); |
| 1353 | if ((ret = p_td_thr_getfpregs (&thandle, &fpregset)) != TD_OK) |
| 1354 | error ("store_registers: td_thr_getfpregs %s", thr_err_string (ret)); |
| 1355 | |
| 1356 | /* restore new register value */ |
| 1357 | memcpy (®isters[REGISTER_BYTE (regno)], old_value, REGISTER_SIZE); |
| 1358 | |
| 1359 | } |
| 1360 | |
| 1361 | fill_gregset (gregset, regno); |
| 1362 | fill_fpregset (&fpregset, regno); |
| 1363 | |
| 1364 | if ((ret = p_td_thr_setgregs (&thandle, gregset)) != TD_OK) |
| 1365 | error ("store_registers: td_thr_setgregs %s", thr_err_string (ret)); |
| 1366 | if ((ret = p_td_thr_setfpregs (&thandle, &fpregset)) != TD_OK && |
| 1367 | ret != TD_NOFPREGS) |
| 1368 | error ("store_registers: td_thr_setfpregs %s", thr_err_string (ret)); |
| 1369 | } |
| 1370 | |
| 1371 | static void |
| 1372 | handle_new_thread (tid, lid, verbose) |
| 1373 | int tid; /* user thread id */ |
| 1374 | int lid; /* kernel thread id */ |
| 1375 | int verbose; |
| 1376 | { |
| 1377 | int gdb_pid = BUILD_THREAD (tid, main_prochandle.pid); |
| 1378 | int wait_pid, wait_status; |
| 1379 | |
| 1380 | if (verbose) |
| 1381 | printf_filtered ("[New %s]\n", target_pid_to_str (gdb_pid)); |
| 1382 | add_thread (gdb_pid); |
| 1383 | |
| 1384 | if (lid != main_prochandle.pid) |
| 1385 | { |
| 1386 | attach_thread (lid); |
| 1387 | /* According to the Eric Paire model, we now have to send |
| 1388 | the restart signal to the new thread -- however, empirically, |
| 1389 | I do not find that to be necessary. */ |
| 1390 | attach_pid = lid; |
| 1391 | } |
| 1392 | } |
| 1393 | |
| 1394 | static void |
| 1395 | test_for_new_thread (tid, lid, verbose) |
| 1396 | int tid; |
| 1397 | int lid; |
| 1398 | int verbose; |
| 1399 | { |
| 1400 | if (!in_thread_list (BUILD_THREAD (tid, main_prochandle.pid))) |
| 1401 | handle_new_thread (tid, lid, verbose); |
| 1402 | } |
| 1403 | |
| 1404 | /* |
| 1405 | * Callback function that gets called once per USER thread |
| 1406 | * (i.e., not kernel) thread by td_ta_thr_iter. |
| 1407 | */ |
| 1408 | |
| 1409 | static int |
| 1410 | find_new_threads_callback (th, ignored) |
| 1411 | const td_thrhandle_t *th; |
| 1412 | void *ignored; |
| 1413 | { |
| 1414 | td_thrinfo_t ti; |
| 1415 | td_err_e ret; |
| 1416 | |
| 1417 | if ((ret = p_td_thr_get_info (th, &ti)) != TD_OK) |
| 1418 | { |
| 1419 | warning ("find_new_threads_callback: %s", thr_err_string (ret)); |
| 1420 | return -1; /* bail out, get_info failed. */ |
| 1421 | } |
| 1422 | |
| 1423 | /* FIXME: |
| 1424 | As things now stand, this should never detect a new thread. |
| 1425 | But if it does, we could be in trouble because we aren't calling |
| 1426 | wait_thread_callback for it. */ |
| 1427 | test_for_new_thread (ti.ti_tid, ti.ti_lid, 0); |
| 1428 | return 0; |
| 1429 | } |
| 1430 | |
| 1431 | /* |
| 1432 | * find_new_threads uses the thread_db iterator function to discover |
| 1433 | * user-space threads. Then if the underlying process stratum has a |
| 1434 | * find_new_threads method, we call that too. |
| 1435 | */ |
| 1436 | |
| 1437 | static void |
| 1438 | thread_db_find_new_threads () |
| 1439 | { |
| 1440 | if (inferior_pid == -1) /* FIXME: still necessary? */ |
| 1441 | { |
| 1442 | printf_filtered ("No process.\n"); |
| 1443 | return; |
| 1444 | } |
| 1445 | p_td_ta_thr_iter (main_threadagent, |
| 1446 | find_new_threads_callback, |
| 1447 | (void *) 0, |
| 1448 | TD_THR_ANY_STATE, |
| 1449 | TD_THR_LOWEST_PRIORITY, |
| 1450 | TD_SIGNO_MASK, |
| 1451 | TD_THR_ANY_USER_FLAGS); |
| 1452 | if (target_beneath->to_find_new_threads) |
| 1453 | target_beneath->to_find_new_threads (); |
| 1454 | } |
| 1455 | |
| 1456 | /* |
| 1457 | * Resume all threads, or resume a single thread. |
| 1458 | * If step is true, then single-step the appropriate thread |
| 1459 | * (or single-step inferior_pid, but continue everyone else). |
| 1460 | * If signo is true, then send that signal to at least one thread. |
| 1461 | */ |
| 1462 | |
| 1463 | /* |
| 1464 | * This function is called once for each thread before resuming. |
| 1465 | * It sends continue (no step, and no signal) to each thread except |
| 1466 | * the main thread, and |
| 1467 | * the event thread (the one that stopped at a breakpoint etc.) |
| 1468 | * |
| 1469 | * The event thread is handled separately so that it can be sent |
| 1470 | * the stepping and signal args with which target_resume was called. |
| 1471 | * |
| 1472 | * The main thread is resumed last, so that the thread_db proc_service |
| 1473 | * callbacks will still work during the iterator function. |
| 1474 | */ |
| 1475 | |
| 1476 | static int |
| 1477 | resume_thread_callback (th, data) |
| 1478 | const td_thrhandle_t *th; |
| 1479 | void *data; |
| 1480 | { |
| 1481 | td_thrinfo_t ti; |
| 1482 | td_err_e ret; |
| 1483 | |
| 1484 | if ((ret = p_td_thr_get_info (th, &ti)) != TD_OK) |
| 1485 | { |
| 1486 | warning ("resume_thread_callback: %s", thr_err_string (ret)); |
| 1487 | return -1; /* bail out, get_info failed. */ |
| 1488 | } |
| 1489 | /* FIXME: |
| 1490 | As things now stand, this should never detect a new thread. |
| 1491 | But if it does, we could be in trouble because we aren't calling |
| 1492 | wait_thread_callback for it. */ |
| 1493 | test_for_new_thread (ti.ti_tid, ti.ti_lid, 1); |
| 1494 | |
| 1495 | if (ti.ti_lid != main_prochandle.pid && |
| 1496 | ti.ti_lid != event_pid) |
| 1497 | { |
| 1498 | /* Unconditionally continue the thread with no signal. |
| 1499 | Only the event thread will get a signal of any kind. */ |
| 1500 | |
| 1501 | target_beneath->to_resume (ti.ti_lid, 0, 0); |
| 1502 | } |
| 1503 | return 0; |
| 1504 | } |
| 1505 | |
| 1506 | static int |
| 1507 | new_resume_thread_callback (thread, data) |
| 1508 | threadinfo *thread; |
| 1509 | void *data; |
| 1510 | { |
| 1511 | if (thread->lid != event_pid && |
| 1512 | thread->lid != main_prochandle.pid) |
| 1513 | { |
| 1514 | /* Unconditionally continue the thread with no signal (for now). */ |
| 1515 | |
| 1516 | target_beneath->to_resume (thread->lid, 0, 0); |
| 1517 | } |
| 1518 | return 0; |
| 1519 | } |
| 1520 | |
| 1521 | static int last_resume_pid; |
| 1522 | static int last_resume_step; |
| 1523 | static int last_resume_signo; |
| 1524 | |
| 1525 | static void |
| 1526 | thread_db_resume (pid, step, signo) |
| 1527 | int pid; |
| 1528 | int step; |
| 1529 | enum target_signal signo; |
| 1530 | { |
| 1531 | last_resume_pid = pid; |
| 1532 | last_resume_step = step; |
| 1533 | last_resume_signo = signo; |
| 1534 | |
| 1535 | /* resuming a specific pid? */ |
| 1536 | if (pid != -1) |
| 1537 | { |
| 1538 | if (is_thread (pid)) |
| 1539 | pid = get_lwp_from_thread_id (GET_THREAD (pid)); |
| 1540 | else if (GET_LWP (pid)) |
| 1541 | pid = GET_LWP (pid); |
| 1542 | } |
| 1543 | |
| 1544 | /* Apparently the interpretation of 'pid' is dependent on 'step': |
| 1545 | If step is true, then a specific pid means 'step only this pid'. |
| 1546 | But if step is not true, then pid means 'continue ALL pids, but |
| 1547 | give the signal only to this one'. */ |
| 1548 | if (pid != -1 && step) |
| 1549 | { |
| 1550 | /* FIXME: is this gonna work in all circumstances? */ |
| 1551 | target_beneath->to_resume (pid, step, signo); |
| 1552 | } |
| 1553 | else |
| 1554 | { |
| 1555 | /* 1) Continue all threads except the event thread and the main thread. |
| 1556 | 2) resume the event thread with step and signo. |
| 1557 | 3) If event thread != main thread, continue the main thread. |
| 1558 | |
| 1559 | Note: order of 2 and 3 may need to be reversed. */ |
| 1560 | |
| 1561 | threadlist_iter (new_resume_thread_callback, |
| 1562 | (void *) 0, |
| 1563 | TD_THR_ANY_STATE, |
| 1564 | TD_THR_ANY_TYPE); |
| 1565 | /* now resume event thread, and if necessary also main thread. */ |
| 1566 | if (event_pid) |
| 1567 | { |
| 1568 | target_beneath->to_resume (event_pid, step, signo); |
| 1569 | } |
| 1570 | if (event_pid != main_prochandle.pid) |
| 1571 | { |
| 1572 | target_beneath->to_resume (main_prochandle.pid, 0, 0); |
| 1573 | } |
| 1574 | } |
| 1575 | } |
| 1576 | |
| 1577 | /* All new threads will be attached. |
| 1578 | All previously known threads will be stopped using kill (SIGKILL). */ |
| 1579 | |
| 1580 | static int |
| 1581 | stop_or_attach_thread_callback (const td_thrhandle_t *th, void *data) |
| 1582 | { |
| 1583 | td_thrinfo_t ti; |
| 1584 | td_err_e ret; |
| 1585 | int gdb_pid; |
| 1586 | int on_off = 1; |
| 1587 | |
| 1588 | if ((ret = p_td_thr_get_info (th, &ti)) != TD_OK) |
| 1589 | { |
| 1590 | warning ("stop_or_attach_thread_callback: %s", thr_err_string (ret)); |
| 1591 | return -1; /* bail out, get_info failed. */ |
| 1592 | } |
| 1593 | |
| 1594 | /* First add it to our internal list. |
| 1595 | We build this list anew at every wait event. */ |
| 1596 | insert_thread (ti.ti_tid, ti.ti_lid, ti.ti_state, ti.ti_type); |
| 1597 | /* Now: if we've already seen it, stop it, else add it and attach it. */ |
| 1598 | gdb_pid = BUILD_THREAD (ti.ti_tid, main_prochandle.pid); |
| 1599 | if (!in_thread_list (gdb_pid)) /* new thread */ |
| 1600 | { |
| 1601 | handle_new_thread (ti.ti_tid, ti.ti_lid, 1); |
| 1602 | /* Enable thread events */ |
| 1603 | if (p_td_thr_event_enable) |
| 1604 | if ((ret = p_td_thr_event_enable (th, on_off)) != TD_OK) |
| 1605 | warning ("stop_or_attach_thread: %s", thr_err_string (ret)); |
| 1606 | } |
| 1607 | else if (ti.ti_lid != event_pid && |
| 1608 | ti.ti_lid != main_prochandle.pid) |
| 1609 | { |
| 1610 | ret = (td_err_e) kill (ti.ti_lid, SIGSTOP); |
| 1611 | } |
| 1612 | |
| 1613 | return 0; |
| 1614 | } |
| 1615 | |
| 1616 | /* |
| 1617 | * Wait for signal N from pid PID. |
| 1618 | * If wait returns any other signals, put them back before returning. |
| 1619 | */ |
| 1620 | |
| 1621 | static void |
| 1622 | wait_for_stop (pid) |
| 1623 | int pid; |
| 1624 | { |
| 1625 | int i; |
| 1626 | int retpid; |
| 1627 | int status; |
| 1628 | |
| 1629 | /* Array of wait/signal status */ |
| 1630 | /* FIXME: wrong data structure, we need a queue. |
| 1631 | Realtime signals may be delivered more than once. |
| 1632 | And at that, we really can't handle them (see below). */ |
| 1633 | #if defined (NSIG) |
| 1634 | static int wstatus [NSIG]; |
| 1635 | #elif defined (_NSIG) |
| 1636 | static int wstatus [_NSIG]; |
| 1637 | #else |
| 1638 | #error No definition for number of signals! |
| 1639 | #endif |
| 1640 | |
| 1641 | /* clear wait/status list */ |
| 1642 | memset (&wstatus, 0, sizeof (wstatus)); |
| 1643 | |
| 1644 | /* Now look for SIGSTOP event on all threads except event thread. */ |
| 1645 | do { |
| 1646 | errno = 0; |
| 1647 | if (pid == main_prochandle.pid) |
| 1648 | retpid = waitpid (pid, &status, 0); |
| 1649 | else |
| 1650 | retpid = waitpid (pid, &status, __WCLONE); |
| 1651 | |
| 1652 | if (retpid > 0) |
| 1653 | if (WSTOPSIG (status) == SIGSTOP) |
| 1654 | { |
| 1655 | /* Got the SIGSTOP event we're looking for. |
| 1656 | Throw it away, and throw any other events back! */ |
| 1657 | for (i = 0; i < sizeof(wstatus) / sizeof (wstatus[0]); i++) |
| 1658 | if (wstatus[i]) |
| 1659 | if (i != SIGSTOP) |
| 1660 | { |
| 1661 | kill (retpid, i); |
| 1662 | } |
| 1663 | break; /* all done */ |
| 1664 | } |
| 1665 | else |
| 1666 | { |
| 1667 | int signo; |
| 1668 | /* Oops, got an event other than SIGSTOP. |
| 1669 | Save it, and throw it back after we find the SIGSTOP event. */ |
| 1670 | |
| 1671 | /* FIXME (how?) This method is going to fail for realtime |
| 1672 | signals, which cannot be put back simply by using kill. */ |
| 1673 | |
| 1674 | if (WIFEXITED (status)) |
| 1675 | error ("Ack! Thread Exited event. What do I do now???"); |
| 1676 | else if (WIFSTOPPED (status)) |
| 1677 | signo = WSTOPSIG (status); |
| 1678 | else |
| 1679 | signo = WTERMSIG (status); |
| 1680 | |
| 1681 | /* If a thread other than the event thread has hit a GDB |
| 1682 | breakpoint (as opposed to some random trap signal), then |
| 1683 | just arrange for it to hit it again later. Back up the |
| 1684 | PC if necessary. Don't forward the SIGTRAP signal to |
| 1685 | the thread. We will handle the current event, eventually |
| 1686 | we will resume all the threads, and this one will get |
| 1687 | it's breakpoint trap again. |
| 1688 | |
| 1689 | If we do not do this, then we run the risk that the user |
| 1690 | will delete or disable the breakpoint, but the thread will |
| 1691 | have already tripped on it. */ |
| 1692 | |
| 1693 | if (retpid != event_pid && |
| 1694 | signo == SIGTRAP && |
| 1695 | breakpoint_inserted_here_p (read_pc_pid (retpid) - |
| 1696 | DECR_PC_AFTER_BREAK)) |
| 1697 | { |
| 1698 | /* Set the pc to before the trap and DO NOT re-send the signal */ |
| 1699 | if (DECR_PC_AFTER_BREAK) |
| 1700 | write_pc_pid (read_pc_pid (retpid) - DECR_PC_AFTER_BREAK, |
| 1701 | retpid); |
| 1702 | } |
| 1703 | |
| 1704 | /* Since SIGINT gets forwarded to the entire process group |
| 1705 | (in the case where ^C is typed at the tty / console), |
| 1706 | just ignore all SIGINTs from other than the event thread. */ |
| 1707 | else if (retpid != event_pid && signo == SIGINT) |
| 1708 | { /* do nothing. Signal will disappear into oblivion! */ |
| 1709 | ; |
| 1710 | } |
| 1711 | |
| 1712 | else /* This is some random signal other than a breakpoint. */ |
| 1713 | { |
| 1714 | wstatus [signo] = 1; |
| 1715 | } |
| 1716 | child_resume (retpid, 0, TARGET_SIGNAL_0); |
| 1717 | continue; |
| 1718 | } |
| 1719 | |
| 1720 | } while (errno == 0 || errno == EINTR); |
| 1721 | } |
| 1722 | |
| 1723 | /* |
| 1724 | * wait_thread_callback |
| 1725 | * |
| 1726 | * Calls waitpid for each thread, repeatedly if necessary, until |
| 1727 | * SIGSTOP is returned. Afterward, if any other signals were returned |
| 1728 | * by waitpid, return them to the thread's pending queue by calling kill. |
| 1729 | */ |
| 1730 | |
| 1731 | static int |
| 1732 | wait_thread_callback (const td_thrhandle_t *th, void *data) |
| 1733 | { |
| 1734 | td_thrinfo_t ti; |
| 1735 | td_err_e ret; |
| 1736 | |
| 1737 | if ((ret = p_td_thr_get_info (th, &ti)) != TD_OK) |
| 1738 | { |
| 1739 | warning ("wait_thread_callback: %s", thr_err_string (ret)); |
| 1740 | return -1; /* bail out, get_info failed. */ |
| 1741 | } |
| 1742 | |
| 1743 | /* This callback to act on all threads except the event thread: */ |
| 1744 | if (ti.ti_lid == event_pid || /* no need to wait (no sigstop) */ |
| 1745 | ti.ti_lid == main_prochandle.pid) /* no need to wait (already waited) */ |
| 1746 | return 0; /* don't wait on the event thread. */ |
| 1747 | |
| 1748 | wait_for_stop (ti.ti_lid); |
| 1749 | return 0; /* finished: next thread. */ |
| 1750 | } |
| 1751 | |
| 1752 | static int |
| 1753 | new_wait_thread_callback (thread, data) |
| 1754 | threadinfo *thread; |
| 1755 | void *data; |
| 1756 | { |
| 1757 | /* don't wait on the event thread -- it's already stopped and waited. |
| 1758 | Ditto the main thread. */ |
| 1759 | if (thread->lid != event_pid && |
| 1760 | thread->lid != main_prochandle.pid) |
| 1761 | { |
| 1762 | wait_for_stop (thread->lid); |
| 1763 | } |
| 1764 | return 0; |
| 1765 | } |
| 1766 | |
| 1767 | /* |
| 1768 | * Wait for any thread to stop, by calling the underlying wait method. |
| 1769 | * The PID returned by the underlying target may be a kernel thread, |
| 1770 | * in which case we will want to convert it to the corresponding |
| 1771 | * user-space thread. |
| 1772 | */ |
| 1773 | |
| 1774 | static int |
| 1775 | thread_db_wait (int pid, struct target_waitstatus *ourstatus) |
| 1776 | { |
| 1777 | td_thrhandle_t thandle; |
| 1778 | td_thrinfo_t ti; |
| 1779 | td_err_e ret; |
| 1780 | lwpid_t lwp; |
| 1781 | int retpid; |
| 1782 | int status; |
| 1783 | int save_errno; |
| 1784 | |
| 1785 | /* OK, we're about to wait for an event from the running inferior. |
| 1786 | Make sure we're ignoring the right signals. */ |
| 1787 | |
| 1788 | check_all_signal_numbers (); /* see if magic signals changed. */ |
| 1789 | |
| 1790 | event_pid = 0; |
| 1791 | attach_pid = 0; |
| 1792 | |
| 1793 | /* FIXME: should I do the wait right here inline? */ |
| 1794 | #if 0 |
| 1795 | if (pid == -1) |
| 1796 | lwp = -1; |
| 1797 | else |
| 1798 | lwp = get_lwp_from_thread_id (GET_THREAD (pid)); |
| 1799 | #endif |
| 1800 | |
| 1801 | |
| 1802 | save_errno = linux_child_wait (-1, &retpid, &status); |
| 1803 | store_waitstatus (ourstatus, status); |
| 1804 | |
| 1805 | /* Thread ID is irrelevant if the target process exited. |
| 1806 | FIXME: do I have any killing to do? |
| 1807 | Can I get this event mistakenly from a thread? */ |
| 1808 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
| 1809 | return retpid; |
| 1810 | |
| 1811 | /* OK, we got an event of interest. |
| 1812 | Go stop all threads and look for new ones. |
| 1813 | FIXME: maybe don't do this for the restart signal? Optimization... */ |
| 1814 | event_pid = retpid; |
| 1815 | |
| 1816 | /* If the last call to resume was for a specific thread, then we don't |
| 1817 | need to stop everyone else: they should already be stopped. */ |
| 1818 | if (last_resume_step == 0 || last_resume_pid == -1) |
| 1819 | { |
| 1820 | /* Main thread must be stopped before calling the iterator. */ |
| 1821 | if (retpid != main_prochandle.pid) |
| 1822 | { |
| 1823 | kill (main_prochandle.pid, SIGSTOP); |
| 1824 | wait_for_stop (main_prochandle.pid); |
| 1825 | } |
| 1826 | |
| 1827 | empty_threadlist (); |
| 1828 | /* Now stop everyone else, and attach any new threads you find. */ |
| 1829 | p_td_ta_thr_iter (main_threadagent, |
| 1830 | stop_or_attach_thread_callback, |
| 1831 | (void *) 0, |
| 1832 | TD_THR_ANY_STATE, |
| 1833 | TD_THR_LOWEST_PRIORITY, |
| 1834 | TD_SIGNO_MASK, |
| 1835 | TD_THR_ANY_USER_FLAGS); |
| 1836 | |
| 1837 | /* Now go call wait on all the threads we've stopped: |
| 1838 | This allows us to absorb the SIGKILL event, and to make sure |
| 1839 | that the thread knows that it is stopped (Linux peculiarity). */ |
| 1840 | |
| 1841 | threadlist_iter (new_wait_thread_callback, |
| 1842 | (void *) 0, |
| 1843 | TD_THR_ANY_STATE, |
| 1844 | TD_THR_ANY_TYPE); |
| 1845 | } |
| 1846 | |
| 1847 | /* Convert the kernel thread id to the corresponding thread id. */ |
| 1848 | |
| 1849 | /* If the process layer does not furnish an lwp, |
| 1850 | then perhaps the returned pid IS the lwp... */ |
| 1851 | if ((lwp = GET_LWP (retpid)) == 0) |
| 1852 | lwp = retpid; |
| 1853 | |
| 1854 | if ((ret = p_td_ta_map_lwp2thr (main_threadagent, lwp, &thandle)) != TD_OK) |
| 1855 | return retpid; /* LWP is not mapped onto a user-space thread. */ |
| 1856 | |
| 1857 | if ((ret = p_td_thr_validate (&thandle)) != TD_OK) |
| 1858 | return retpid; /* LWP is not mapped onto a valid thread. */ |
| 1859 | |
| 1860 | if ((ret = p_td_thr_get_info (&thandle, &ti)) != TD_OK) |
| 1861 | { |
| 1862 | warning ("thread_db: thr_get_info failed ('%s')", thr_err_string (ret)); |
| 1863 | return retpid; |
| 1864 | } |
| 1865 | |
| 1866 | retpid = BUILD_THREAD (ti.ti_tid, main_prochandle.pid); |
| 1867 | /* If this is a new user thread, notify GDB about it. */ |
| 1868 | if (!in_thread_list (retpid)) |
| 1869 | { |
| 1870 | printf_filtered ("[New %s]\n", target_pid_to_str (retpid)); |
| 1871 | add_thread (retpid); |
| 1872 | } |
| 1873 | |
| 1874 | #if 0 |
| 1875 | /* Now detect if this is a thread creation/deletion event: */ |
| 1876 | check_for_thread_event (ourstatus, retpid); |
| 1877 | #endif |
| 1878 | return retpid; |
| 1879 | } |
| 1880 | |
| 1881 | /* |
| 1882 | * kill has to call the underlying kill. |
| 1883 | * FIXME: I'm not sure if it's necessary to check inferior_pid any more, |
| 1884 | * but we might need to fix inferior_pid up if it's a user thread. |
| 1885 | */ |
| 1886 | |
| 1887 | static int |
| 1888 | kill_thread_callback (th, data) |
| 1889 | td_thrhandle_t *th; |
| 1890 | void *data; |
| 1891 | { |
| 1892 | td_thrinfo_t ti; |
| 1893 | td_err_e ret; |
| 1894 | |
| 1895 | /* Fixme: |
| 1896 | For Linux, threads may need to be waited. */ |
| 1897 | if ((ret = p_td_thr_get_info (th, &ti)) != TD_OK) |
| 1898 | { |
| 1899 | warning ("kill_thread_callback: %s", thr_err_string (ret)); |
| 1900 | return -1; /* bail out, get_info failed. */ |
| 1901 | } |
| 1902 | |
| 1903 | if (ti.ti_lid != main_prochandle.pid) |
| 1904 | { |
| 1905 | kill (ti.ti_lid, SIGKILL); |
| 1906 | } |
| 1907 | return 0; |
| 1908 | } |
| 1909 | |
| 1910 | |
| 1911 | static void thread_db_kill (void) |
| 1912 | { |
| 1913 | int rpid; |
| 1914 | int status; |
| 1915 | |
| 1916 | /* Fixme: |
| 1917 | For Linux, threads may need to be waited. */ |
| 1918 | if (inferior_pid != 0) |
| 1919 | { |
| 1920 | /* Go kill the children first. Save the main thread for last. */ |
| 1921 | p_td_ta_thr_iter (main_threadagent, |
| 1922 | kill_thread_callback, |
| 1923 | (void *) 0, |
| 1924 | TD_THR_ANY_STATE, |
| 1925 | TD_THR_LOWEST_PRIORITY, |
| 1926 | TD_SIGNO_MASK, |
| 1927 | TD_THR_ANY_USER_FLAGS); |
| 1928 | |
| 1929 | /* Turn off thread_db event-reporting API *before* killing the |
| 1930 | main thread, since this operation requires child memory access. |
| 1931 | Can't move this into thread_db_unpush target because then |
| 1932 | detach would not work. */ |
| 1933 | disable_thread_event_reporting (main_threadagent); |
| 1934 | |
| 1935 | inferior_pid = main_prochandle.pid; |
| 1936 | |
| 1937 | /* |
| 1938 | * Since both procfs_kill and ptrace_kill call target_mourn, |
| 1939 | * it should be sufficient for me to call one of them. |
| 1940 | * That will result in my mourn being called, which will both |
| 1941 | * unpush me and call the underlying mourn. |
| 1942 | */ |
| 1943 | target_beneath->to_kill (); |
| 1944 | } |
| 1945 | |
| 1946 | /* Wait for all threads. */ |
| 1947 | /* FIXME: need a universal wait_for_signal func? */ |
| 1948 | do |
| 1949 | { |
| 1950 | rpid = waitpid (-1, &status, __WCLONE | WNOHANG); |
| 1951 | } |
| 1952 | while (rpid > 0 || errno == EINTR); |
| 1953 | |
| 1954 | do |
| 1955 | { |
| 1956 | rpid = waitpid (-1, &status, WNOHANG); |
| 1957 | } |
| 1958 | while (rpid > 0 || errno == EINTR); |
| 1959 | } |
| 1960 | |
| 1961 | /* |
| 1962 | * Mourn has to remove us from the target stack, |
| 1963 | * and then call the underlying mourn. |
| 1964 | */ |
| 1965 | |
| 1966 | static void thread_db_mourn_inferior (void) |
| 1967 | { |
| 1968 | thread_db_unpush_target (); |
| 1969 | target_mourn_inferior (); /* call the underlying mourn */ |
| 1970 | } |
| 1971 | |
| 1972 | /* |
| 1973 | * Detach has to remove us from the target stack, |
| 1974 | * and then call the underlying detach. |
| 1975 | * |
| 1976 | * But first, it has to detach all the cloned threads! |
| 1977 | */ |
| 1978 | |
| 1979 | static int |
| 1980 | detach_thread_callback (th, data) |
| 1981 | td_thrhandle_t *th; |
| 1982 | void *data; |
| 1983 | { |
| 1984 | /* Called once per thread. */ |
| 1985 | td_thrinfo_t ti; |
| 1986 | td_err_e ret; |
| 1987 | |
| 1988 | if ((ret = p_td_thr_get_info (th, &ti)) != TD_OK) |
| 1989 | { |
| 1990 | warning ("detach_thread_callback: %s", thr_err_string (ret)); |
| 1991 | return -1; /* bail out, get_info failed. */ |
| 1992 | } |
| 1993 | |
| 1994 | if (!in_thread_list (BUILD_THREAD (ti.ti_tid, main_prochandle.pid))) |
| 1995 | return 0; /* apparently we don't know this one. */ |
| 1996 | |
| 1997 | /* Save main thread for last, or the iterator will fail! */ |
| 1998 | if (ti.ti_lid != main_prochandle.pid) |
| 1999 | { |
| 2000 | struct cleanup *old_chain; |
| 2001 | int off = 0; |
| 2002 | |
| 2003 | /* Time to detach this thread. |
| 2004 | First disable thread_db event reporting for the thread. */ |
| 2005 | if (p_td_thr_event_enable && |
| 2006 | (ret = p_td_thr_event_enable (th, off)) != TD_OK) |
| 2007 | { |
| 2008 | warning ("detach_thread_callback: %s\n", thr_err_string (ret)); |
| 2009 | return 0; |
| 2010 | } |
| 2011 | |
| 2012 | /* Now cancel any pending SIGTRAPS. FIXME! */ |
| 2013 | |
| 2014 | /* Call underlying detach method. FIXME just detach it. */ |
| 2015 | old_chain = save_inferior_pid (); |
| 2016 | inferior_pid = ti.ti_lid; |
| 2017 | detach (TARGET_SIGNAL_0); |
| 2018 | do_cleanups (old_chain); |
| 2019 | } |
| 2020 | return 0; |
| 2021 | } |
| 2022 | |
| 2023 | static void |
| 2024 | thread_db_detach (char *args, int from_tty) |
| 2025 | { |
| 2026 | td_err_e ret; |
| 2027 | |
| 2028 | if ((ret = p_td_ta_thr_iter (main_threadagent, |
| 2029 | detach_thread_callback, |
| 2030 | (void *) 0, |
| 2031 | TD_THR_ANY_STATE, |
| 2032 | TD_THR_LOWEST_PRIORITY, |
| 2033 | TD_SIGNO_MASK, |
| 2034 | TD_THR_ANY_USER_FLAGS)) |
| 2035 | != TD_OK) |
| 2036 | warning ("detach (thr_iter): %s", thr_err_string (ret)); |
| 2037 | |
| 2038 | /* Turn off thread_db event-reporting API |
| 2039 | (before detaching the main thread) */ |
| 2040 | disable_thread_event_reporting (main_threadagent); |
| 2041 | |
| 2042 | thread_db_unpush_target (); |
| 2043 | |
| 2044 | /* above call nullifies target_beneath, so don't use that! */ |
| 2045 | inferior_pid = PIDGET (inferior_pid); |
| 2046 | target_detach (args, from_tty); |
| 2047 | } |
| 2048 | |
| 2049 | |
| 2050 | /* |
| 2051 | * We never want to actually create the inferior! |
| 2052 | * |
| 2053 | * If this is ever called, it means we were on the target stack |
| 2054 | * when the user said "run". But we don't want to be on the new |
| 2055 | * inferior's target stack until the thread_db / libthread |
| 2056 | * connection is ready to be made. |
| 2057 | * |
| 2058 | * So, what shall we do? |
| 2059 | * Unpush ourselves from the stack, and then invoke |
| 2060 | * find_default_create_inferior, which will invoke the |
| 2061 | * appropriate process_stratum target to do the create. |
| 2062 | */ |
| 2063 | |
| 2064 | static void |
| 2065 | thread_db_create_inferior (exec_file, allargs, env) |
| 2066 | char *exec_file; |
| 2067 | char *allargs; |
| 2068 | char **env; |
| 2069 | { |
| 2070 | thread_db_unpush_target (); |
| 2071 | find_default_create_inferior (exec_file, allargs, env); |
| 2072 | } |
| 2073 | |
| 2074 | /* |
| 2075 | * Thread_db target vector initializer. |
| 2076 | */ |
| 2077 | |
| 2078 | void |
| 2079 | init_thread_db_ops () |
| 2080 | { |
| 2081 | thread_db_ops.to_shortname = "multi-thread"; |
| 2082 | thread_db_ops.to_longname = "multi-threaded child process."; |
| 2083 | thread_db_ops.to_doc = "Threads and pthreads support."; |
| 2084 | thread_db_ops.to_files_info = thread_db_files_info; |
| 2085 | thread_db_ops.to_create_inferior = thread_db_create_inferior; |
| 2086 | thread_db_ops.to_detach = thread_db_detach; |
| 2087 | thread_db_ops.to_wait = thread_db_wait; |
| 2088 | thread_db_ops.to_resume = thread_db_resume; |
| 2089 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
| 2090 | thread_db_ops.to_kill = thread_db_kill; |
| 2091 | thread_db_ops.to_xfer_memory = thread_db_xfer_memory; |
| 2092 | thread_db_ops.to_fetch_registers = thread_db_fetch_registers; |
| 2093 | thread_db_ops.to_store_registers = thread_db_store_registers; |
| 2094 | thread_db_ops.to_thread_alive = thread_db_alive; |
| 2095 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; |
| 2096 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; |
| 2097 | thread_db_ops.to_stratum = thread_stratum; |
| 2098 | thread_db_ops.to_has_thread_control = tc_schedlock; |
| 2099 | thread_db_ops.to_magic = OPS_MAGIC; |
| 2100 | } |
| 2101 | #endif /* HAVE_STDINT_H */ |
| 2102 | |
| 2103 | /* |
| 2104 | * Module constructor / initializer function. |
| 2105 | * If connection to thread_db dynamic library is successful, |
| 2106 | * then initialize this module's target vectors and the |
| 2107 | * new_objfile hook. |
| 2108 | */ |
| 2109 | |
| 2110 | |
| 2111 | void |
| 2112 | _initialize_thread_db () |
| 2113 | { |
| 2114 | #ifdef HAVE_STDINT_H /* stub out entire module, leave initializer empty */ |
| 2115 | if (init_thread_db_library ()) |
| 2116 | { |
| 2117 | init_thread_db_ops (); |
| 2118 | add_target (&thread_db_ops); |
| 2119 | /* |
| 2120 | * Hook up to the new_objfile event. |
| 2121 | * If someone is already there, arrange for him to be called |
| 2122 | * after we are. |
| 2123 | */ |
| 2124 | target_new_objfile_chain = target_new_objfile_hook; |
| 2125 | target_new_objfile_hook = thread_db_new_objfile; |
| 2126 | } |
| 2127 | #endif /* HAVE_STDINT_H */ |
| 2128 | } |
| 2129 | |