diff options
Diffstat (limited to 'gdb/thread-db.c')
| -rw-r--r-- | gdb/thread-db.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/gdb/thread-db.c b/gdb/thread-db.c index 34b5c55..9338c57 100644 --- a/gdb/thread-db.c +++ b/gdb/thread-db.c @@ -32,6 +32,7 @@ #include "objfiles.h" #include "target.h" #include "regcache.h" +#include "solib-svr4.h" #ifndef LIBTHREAD_DB_SO #define LIBTHREAD_DB_SO "libthread_db.so.1" @@ -108,6 +109,11 @@ static td_err_e (*td_thr_setgregs_p) (const td_thrhandle_t *th, prgregset_t gregs); static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event); +static td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, + void *map_address, + size_t offset, + void **address); + /* Location of the thread creation event breakpoint. The code at this location in the child process will be called by the pthread library whenever a new thread is created. By setting a special breakpoint @@ -348,6 +354,7 @@ thread_db_load (void) td_ta_set_event_p = dlsym (handle, "td_ta_set_event"); td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"); td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"); + td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr"); return 1; } @@ -1003,6 +1010,97 @@ thread_db_pid_to_str (ptid_t ptid) return normal_pid_to_str (ptid); } +/* Get the address of the thread local variable in OBJFILE which is + stored at OFFSET within the thread local storage for thread PTID. */ + +static CORE_ADDR +thread_db_get_thread_local_address (ptid_t ptid, struct objfile *objfile, + CORE_ADDR offset) +{ + if (is_thread (ptid)) + { + int objfile_is_library = (objfile->flags & OBJF_SHARED); + td_err_e err; + td_thrhandle_t th; + void *address; + CORE_ADDR lm; + + /* glibc doesn't provide the needed interface. */ + if (! td_thr_tls_get_addr_p) + error ("Cannot find thread-local variables in this thread library."); + + /* Get the address of the link map for this objfile. */ + lm = svr4_fetch_objfile_link_map (objfile); + + /* Whoops, we couldn't find one. Bail out. */ + if (!lm) + { + if (objfile_is_library) + error ("Cannot find shared library `%s' link_map in dynamic" + " linker's module list", objfile->name); + else + error ("Cannot find executable file `%s' link_map in dynamic" + " linker's module list", objfile->name); + } + + /* Get info about the thread. */ + err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (ptid), &th); + if (err != TD_OK) + error ("Cannot find thread %ld: %s", + (long) GET_THREAD (ptid), thread_db_err_str (err)); + + /* Finally, get the address of the variable. */ + err = td_thr_tls_get_addr_p (&th, (void *) lm, offset, &address); + +#ifdef THREAD_DB_HAS_TD_NOTALLOC + /* The memory hasn't been allocated, yet. */ + if (err == TD_NOTALLOC) + { + /* Now, if libthread_db provided the initialization image's + address, we *could* try to build a non-lvalue value from + the initialization image. */ + if (objfile_is_library) + error ("The inferior has not yet allocated storage for" + " thread-local variables in\n" + "the shared library `%s'\n" + "for the thread %ld", + objfile->name, (long) GET_THREAD (ptid)); + else + error ("The inferior has not yet allocated storage for" + " thread-local variables in\n" + "the executable `%s'\n" + "for the thread %ld", + objfile->name, (long) GET_THREAD (ptid)); + } +#endif + + /* Something else went wrong. */ + if (err != TD_OK) + { + if (objfile_is_library) + error ("Cannot find thread-local storage for thread %ld, " + "shared library %s:\n%s", + (long) GET_THREAD (ptid), + objfile->name, + thread_db_err_str (err)); + else + error ("Cannot find thread-local storage for thread %ld, " + "executable file %s:\n%s", + (long) GET_THREAD (ptid), + objfile->name, + thread_db_err_str (err)); + } + + /* Cast assuming host == target. Joy. */ + return (CORE_ADDR) address; + } + + if (target_beneath->to_get_thread_local_address) + return target_beneath->to_get_thread_local_address (ptid, objfile, offset); + + error ("Cannot find thread-local values on this target."); +} + static void init_thread_db_ops (void) { @@ -1025,6 +1123,8 @@ init_thread_db_ops (void) thread_db_ops.to_pid_to_str = thread_db_pid_to_str; thread_db_ops.to_stratum = thread_stratum; thread_db_ops.to_has_thread_control = tc_schedlock; + thread_db_ops.to_get_thread_local_address + = thread_db_get_thread_local_address; thread_db_ops.to_magic = OPS_MAGIC; } |