diff options
Diffstat (limited to 'gdb/linux-thread-db.c')
| -rw-r--r-- | gdb/linux-thread-db.c | 50 |
1 files changed, 36 insertions, 14 deletions
diff --git a/gdb/linux-thread-db.c b/gdb/linux-thread-db.c index ca614a3..c0f7b1a 100644 --- a/gdb/linux-thread-db.c +++ b/gdb/linux-thread-db.c @@ -196,6 +196,9 @@ struct thread_db_info td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, psaddr_t map_address, size_t offset, psaddr_t *address); + td_err_e (*td_thr_tlsbase_p) (const td_thrhandle_t *th, + unsigned long int modid, + psaddr_t *base); }; /* List of known processes using thread_db, and the required @@ -799,6 +802,7 @@ try_thread_db_load_1 (struct thread_db_info *info) info->td_ta_event_getmsg_p = dlsym (info->handle, "td_ta_event_getmsg"); info->td_thr_event_enable_p = dlsym (info->handle, "td_thr_event_enable"); info->td_thr_tls_get_addr_p = dlsym (info->handle, "td_thr_tls_get_addr"); + info->td_thr_tlsbase_p = dlsym (info->handle, "td_thr_tlsbase"); if (thread_db_find_new_threads_silently (inferior_ptid) != 0) { @@ -1811,21 +1815,39 @@ thread_db_get_thread_local_address (struct target_ops *ops, info = get_thread_db_info (ptid_get_pid (ptid)); - /* glibc doesn't provide the needed interface. */ - if (!info->td_thr_tls_get_addr_p) - throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, - _("No TLS library support")); - - /* Caller should have verified that lm != 0. */ - gdb_assert (lm != 0); - /* Finally, get the address of the variable. */ - /* Note the cast through uintptr_t: this interface only works if - a target address fits in a psaddr_t, which is a host pointer. - So a 32-bit debugger can not access 64-bit TLS through this. */ - err = info->td_thr_tls_get_addr_p (&thread_info->private->th, - (psaddr_t)(uintptr_t) lm, - offset, &address); + if (lm != 0) + { + /* glibc doesn't provide the needed interface. */ + if (!info->td_thr_tls_get_addr_p) + throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, + _("No TLS library support")); + + /* Note the cast through uintptr_t: this interface only works if + a target address fits in a psaddr_t, which is a host pointer. + So a 32-bit debugger can not access 64-bit TLS through this. */ + err = info->td_thr_tls_get_addr_p (&thread_info->private->th, + (psaddr_t)(uintptr_t) lm, + offset, &address); + } + else + { + /* If glibc doesn't provide the needed interface throw an error + that LM is zero - normally cases it should not be. */ + if (!info->td_thr_tlsbase_p) + throw_error (TLS_LOAD_MODULE_NOT_FOUND_ERROR, + _("TLS load module not found")); + + /* This code path handles the case of -static -pthread executables: + https://sourceware.org/ml/libc-help/2014-03/msg00024.html + For older GNU libc r_debug.r_map is NULL. For GNU libc after + PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL. + The constant number 1 depends on GNU __libc_setup_tls + initialization of l_tls_modid to 1. */ + err = info->td_thr_tlsbase_p (&thread_info->private->th, + 1, &address); + address = (char *) address + offset; + } #ifdef THREAD_DB_HAS_TD_NOTALLOC /* The memory hasn't been allocated, yet. */ |