diff options
Diffstat (limited to 'nptl_db/td_ta_map_lwp2thr.c')
| -rw-r--r-- | nptl_db/td_ta_map_lwp2thr.c | 69 |
1 files changed, 50 insertions, 19 deletions
diff --git a/nptl_db/td_ta_map_lwp2thr.c b/nptl_db/td_ta_map_lwp2thr.c index 1e93210b93..78cfcab769 100644 --- a/nptl_db/td_ta_map_lwp2thr.c +++ b/nptl_db/td_ta_map_lwp2thr.c @@ -1,5 +1,5 @@ /* Which thread is running on an LWP? - Copyright (C) 2003, 2004 Free Software Foundation, Inc. + Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -24,8 +24,8 @@ td_err_e -td_ta_map_lwp2thr (const td_thragent_t *ta_arg, - lwpid_t lwpid, td_thrhandle_t *th) +__td_ta_lookup_th_unique (const td_thragent_t *ta_arg, + lwpid_t lwpid, td_thrhandle_t *th) { td_thragent_t *const ta = (td_thragent_t *) ta_arg; ps_err_e err; @@ -118,9 +118,6 @@ td_ta_map_lwp2thr (const td_thragent_t *ta_arg, switch (ta->ta_howto) { - case ta_howto_unknown: - return TD_DBERR; - default: return TD_DBERR; @@ -132,6 +129,7 @@ td_ta_map_lwp2thr (const td_thragent_t *ta_arg, 0, regs, &addr); if (terr != TD_OK) return terr; + /* In this descriptor the nelem word is overloaded as the bias. */ addr += (int32_t) DB_DESC_NELEM (ta->ta_howto_data.reg); th->th_unique = addr; @@ -143,22 +141,22 @@ td_ta_map_lwp2thr (const td_thragent_t *ta_arg, if (&ps_get_thread_area == NULL) return TD_NOCAPAB; - /* A la x86-64, there is a constant magic index for get_thread_area. */ - if (ps_get_thread_area (ta->ph, lwpid, - ta->ta_howto_data.const_thread_area, - &th->th_unique) != PS_OK) - return TD_ERR; /* XXX Other error value? */ - break; + /* A la x86-64, there is a magic index for get_thread_area. */ + if (ps_get_thread_area (ta->ph, lwpid, + ta->ta_howto_data.const_thread_area, + &th->th_unique) != PS_OK) + return TD_ERR; /* XXX Other error value? */ + break; - case ta_howto_reg_thread_area: + case ta_howto_reg_thread_area: if (&ps_get_thread_area == NULL) return TD_NOCAPAB; - /* A la i386, there is a register with an index for get_thread_area. */ - if (ps_lgetregs (ta->ph, lwpid, regs) != PS_OK) - return TD_ERR; - terr = _td_fetch_value_local (ta, ta->ta_howto_data.reg_thread_area, -1, - 0, regs, &addr); + /* A la i386, a register holds the index for get_thread_area. */ + if (ps_lgetregs (ta->ph, lwpid, regs) != PS_OK) + return TD_ERR; + terr = _td_fetch_value_local (ta, ta->ta_howto_data.reg_thread_area, + -1, 0, regs, &addr); if (terr != TD_OK) return terr; /* In this descriptor the nelem word is overloaded as scale factor. */ @@ -172,7 +170,40 @@ td_ta_map_lwp2thr (const td_thragent_t *ta_arg, } /* Found it. Now complete the `td_thrhandle_t' object. */ - th->th_ta_p = (td_thragent_t *) ta; + th->th_ta_p = ta; return TD_OK; } + +td_err_e +td_ta_map_lwp2thr (const td_thragent_t *ta_arg, + lwpid_t lwpid, td_thrhandle_t *th) +{ + td_thragent_t *const ta = (td_thragent_t *) ta_arg; + + /* We cannot rely on thread registers and such information at all + before __pthread_initialize_minimal has gotten far enough. They + sometimes contain garbage that would confuse us, left by the kernel + at exec. So if it looks like initialization is incomplete, we only + fake a special descriptor for the initial thread. */ + + psaddr_t list; + td_err_e err = DB_GET_SYMBOL (list, ta, __stack_user); + if (err != TD_OK) + return err; + + err = DB_GET_FIELD (list, ta, list, list_t, next, 0); + if (err != TD_OK) + return err; + + if (list == 0) + { + if (ps_getpid (ta->ph) != lwpid) + return TD_ERR; + th->th_ta_p = ta; + th->th_unique = 0; + return TD_OK; + } + + return __td_ta_lookup_th_unique (ta_arg, lwpid, th); +} |