FreeBSD-5.3/lib/libthread_db/libpthread_db.c
/*
* Copyright (c) 2004 David Xu <davidxu@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libthread_db/libpthread_db.c,v 1.6 2004/08/16 05:20:12 davidxu Exp $");
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/kse.h>
#include <sys/ptrace.h>
#include <proc_service.h>
#include <thread_db.h>
#include "libpthread_db.h"
#define P2T(c) ps2td(c)
static void pt_unmap_lwp(const td_thragent_t *ta, lwpid_t lwp);
static int pt_validate(const td_thrhandle_t *th);
static int
ps2td(int c)
{
switch (c) {
case PS_OK:
return TD_OK;
case PS_ERR:
return TD_ERR;
case PS_BADPID:
return TD_BADPH;
case PS_BADLID:
return TD_NOLWP;
case PS_BADADDR:
return TD_ERR;
case PS_NOSYM:
return TD_NOLIBTHREAD;
case PS_NOFREGS:
return TD_NOFPREGS;
default:
return TD_ERR;
}
}
static long
pt_map_thread(const td_thragent_t *const_ta, psaddr_t pt, int type)
{
td_thragent_t *ta = __DECONST(td_thragent_t *, const_ta);
struct pt_map *new;
int i, first = -1;
/* leave zero out */
for (i = 1; i < ta->map_len; ++i) {
if (ta->map[i].type == PT_NONE) {
if (first == -1)
first = i;
} else if (ta->map[i].type == type && ta->map[i].thr == pt) {
return (i);
}
}
if (first == -1) {
if (ta->map_len == 0) {
ta->map = calloc(20, sizeof(struct pt_map));
if (ta->map == NULL)
return (-1);
ta->map_len = 20;
first = 1;
} else {
new = realloc(ta->map,
sizeof(struct pt_map) * ta->map_len * 2);
if (new == NULL)
return (-1);
memset(new + ta->map_len, '\0', sizeof(struct pt_map) *
ta->map_len);
first = ta->map_len;
ta->map = new;
ta->map_len *= 2;
}
}
ta->map[first].type = type;
ta->map[first].thr = pt;
return (first);
}
static td_err_e
pt_init(void)
{
pt_md_init();
return (0);
}
static td_err_e
pt_ta_new(struct ps_prochandle *ph, td_thragent_t **pta)
{
#define LOOKUP_SYM(proc, sym, addr) \
ret = ps_pglobal_lookup(proc, NULL, sym, addr); \
if (ret != 0) { \
TDBG("can not find symbol: %s\n", sym); \
ret = TD_NOLIBTHREAD; \
goto error; \
}
#define LOOKUP_VAL(proc, sym, val) \
ret = ps_pglobal_lookup(proc, NULL, sym, &vaddr);\
if (ret != 0) { \
TDBG("can not find symbol: %s\n", sym); \
ret = TD_NOLIBTHREAD; \
goto error; \
} \
ret = ps_pread(proc, vaddr, val, sizeof(int)); \
if (ret != 0) { \
TDBG("can not read value of %s\n", sym);\
ret = TD_NOLIBTHREAD; \
goto error; \
}
td_thragent_t *ta;
psaddr_t vaddr;
int dbg;
int ret;
TDBG_FUNC();
ta = malloc(sizeof(td_thragent_t));
if (ta == NULL)
return (TD_MALLOC);
ta->ph = ph;
ta->thread_activated = 0;
ta->map = NULL;
ta->map_len = 0;
LOOKUP_SYM(ph, "_libkse_debug", &ta->libkse_debug_addr);
LOOKUP_SYM(ph, "_thread_list", &ta->thread_list_addr);
LOOKUP_SYM(ph, "_thread_activated", &ta->thread_activated_addr);
LOOKUP_SYM(ph, "_thread_active_threads",&ta->thread_active_threads_addr);
LOOKUP_SYM(ph, "_thread_keytable", &ta->thread_keytable_addr);
LOOKUP_VAL(ph, "_thread_off_dtv", &ta->thread_off_dtv);
LOOKUP_VAL(ph, "_thread_off_kse_locklevel", &ta->thread_off_kse_locklevel);
LOOKUP_VAL(ph, "_thread_off_kse", &ta->thread_off_kse);
LOOKUP_VAL(ph, "_thread_off_tlsindex", &ta->thread_off_tlsindex);
LOOKUP_VAL(ph, "_thread_off_attr_flags", &ta->thread_off_attr_flags);
LOOKUP_VAL(ph, "_thread_size_key", &ta->thread_size_key);
LOOKUP_VAL(ph, "_thread_off_tcb", &ta->thread_off_tcb);
LOOKUP_VAL(ph, "_thread_off_linkmap", &ta->thread_off_linkmap);
LOOKUP_VAL(ph, "_thread_off_tmbx", &ta->thread_off_tmbx);
LOOKUP_VAL(ph, "_thread_off_thr_locklevel", &ta->thread_off_thr_locklevel);
LOOKUP_VAL(ph, "_thread_off_next", &ta->thread_off_next);
LOOKUP_VAL(ph, "_thread_off_state", &ta->thread_off_state);
LOOKUP_VAL(ph, "_thread_max_keys", &ta->thread_max_keys);
LOOKUP_VAL(ph, "_thread_off_key_allocated", &ta->thread_off_key_allocated);
LOOKUP_VAL(ph, "_thread_off_key_destructor", &ta->thread_off_key_destructor);
LOOKUP_VAL(ph, "_thread_state_running", &ta->thread_state_running);
LOOKUP_VAL(ph, "_thread_state_zoombie", &ta->thread_state_zoombie);
dbg = getpid();
/*
* If this fails it probably means we're debugging a core file and
* can't write to it.
*/
ps_pwrite(ph, ta->libkse_debug_addr, &dbg, sizeof(int));
*pta = ta;
return (0);
error:
free(ta);
return (ret);
}
static td_err_e
pt_ta_delete(td_thragent_t *ta)
{
int dbg;
TDBG_FUNC();
dbg = 0;
/*
* Error returns from this write are not really a problem;
* the process doesn't exist any more.
*/
ps_pwrite(ta->ph, ta->libkse_debug_addr, &dbg, sizeof(int));
if (ta->map)
free(ta->map);
free(ta);
return (TD_OK);
}
static td_err_e
pt_ta_map_id2thr(const td_thragent_t *ta, thread_t id, td_thrhandle_t *th)
{
prgregset_t gregs;
TAILQ_HEAD(, pthread) thread_list;
psaddr_t pt, tcb_addr;
lwpid_t lwp;
int ret;
TDBG_FUNC();
if (id < 0 || id >= ta->map_len || ta->map[id].type == PT_NONE)
return (TD_NOTHR);
ret = ps_pread(ta->ph, ta->thread_list_addr, &thread_list,
sizeof(thread_list));
if (ret != 0)
return (P2T(ret));
pt = (psaddr_t)thread_list.tqh_first;
if (ta->map[id].type == PT_LWP) {
/*
* if we are referencing a lwp, make sure it was not already
* mapped to user thread.
*/
while (pt != 0) {
ret = ps_pread(ta->ph,
pt + ta->thread_off_tcb,
&tcb_addr, sizeof(tcb_addr));
if (ret != 0)
return (P2T(ret));
ret = ps_pread(ta->ph,
tcb_addr + ta->thread_off_tmbx +
offsetof(struct kse_thr_mailbox, tm_lwp),
&lwp, sizeof(lwp));
if (ret != 0)
return (P2T(ret));
/*
* If the lwp was already mapped to userland thread,
* we shouldn't reference it directly in future.
*/
if (lwp == ta->map[id].lwp) {
ta->map[id].type = PT_NONE;
return (TD_NOTHR);
}
/* get next thread */
ret = ps_pread(ta->ph,
pt + ta->thread_off_next,
&pt, sizeof(pt));
if (ret != 0)
return (P2T(ret));
}
/* check lwp */
ret = ptrace(PT_GETREGS, ta->map[id].lwp, (caddr_t)&gregs, 0);
if (ret != 0) {
/* no longer exists */
ta->map[id].type = PT_NONE;
return (TD_NOTHR);
}
} else {
while (pt != 0 && ta->map[id].thr != pt) {
ret = ps_pread(ta->ph,
pt + ta->thread_off_tcb,
&tcb_addr, sizeof(tcb_addr));
if (ret != 0)
return (P2T(ret));
/* get next thread */
ret = ps_pread(ta->ph,
pt + ta->thread_off_next,
&pt, sizeof(pt));
if (ret != 0)
return (P2T(ret));
}
if (pt == 0) {
/* no longer exists */
ta->map[id].type = PT_NONE;
return (TD_NOTHR);
}
}
th->th_ta = ta;
th->th_tid = id;
return (TD_OK);
}
static td_err_e
pt_ta_map_lwp2thr(const td_thragent_t *ta, lwpid_t lwp, td_thrhandle_t *th)
{
TAILQ_HEAD(, pthread) thread_list;
psaddr_t pt, ptr;
lwpid_t tmp_lwp;
int ret;
TDBG_FUNC();
ret = ps_pread(ta->ph, ta->thread_list_addr, &thread_list,
sizeof(thread_list));
if (ret != 0)
return (P2T(ret));
pt = (psaddr_t)thread_list.tqh_first;
while (pt != 0) {
ret = ps_pread(ta->ph, pt + ta->thread_off_tcb,
&ptr, sizeof(ptr));
if (ret != 0)
return (P2T(ret));
ptr += ta->thread_off_tmbx +
offsetof(struct kse_thr_mailbox, tm_lwp);
ret = ps_pread(ta->ph, ptr, &tmp_lwp, sizeof(lwpid_t));
if (ret != 0)
return (P2T(ret));
if (tmp_lwp == lwp) {
th->th_ta = ta;
th->th_tid = pt_map_thread(ta, pt, PT_USER);
if (th->th_tid == -1)
return (TD_MALLOC);
pt_unmap_lwp(ta, lwp);
return (TD_OK);
}
/* get next thread */
ret = ps_pread(ta->ph,
pt + ta->thread_off_next,
&pt, sizeof(pt));
if (ret != 0)
return (P2T(ret));
}
return (TD_NOTHR);
}
static td_err_e
pt_ta_thr_iter(const td_thragent_t *ta,
td_thr_iter_f *callback, void *cbdata_p,
td_thr_state_e state, int ti_pri,
sigset_t *ti_sigmask_p,
unsigned int ti_user_flags)
{
TAILQ_HEAD(, pthread) thread_list;
td_thrhandle_t th;
psaddr_t pt;
ps_err_e pserr;
int activated;
TDBG_FUNC();
pserr = ps_pread(ta->ph, ta->thread_activated_addr, &activated,
sizeof(int));
if (pserr != PS_OK)
return (P2T(pserr));
if (!activated)
return (TD_OK);
pserr = ps_pread(ta->ph, ta->thread_list_addr, &thread_list,
sizeof(thread_list));
if (pserr != 0)
return (P2T(pserr));
pt = (psaddr_t)thread_list.tqh_first;
while (pt != 0) {
th.th_ta = ta;
th.th_tid = pt_map_thread(ta, pt, PT_USER);
/* should we unmap lwp here ? */
if (th.th_tid == -1)
return (TD_MALLOC);
if ((*callback)(&th, cbdata_p))
return (TD_DBERR);
/* get next thread */
pserr = ps_pread(ta->ph,
pt + ta->thread_off_next, &pt,
sizeof(pt));
if (pserr != PS_OK)
return (P2T(pserr));
}
return (TD_OK);
}
static td_err_e
pt_ta_tsd_iter(const td_thragent_t *ta, td_key_iter_f *ki, void *arg)
{
char *keytable;
void *destructor;
int i, ret, allocated;
TDBG_FUNC();
keytable = malloc(ta->thread_max_keys * ta->thread_size_key);
if (keytable == NULL)
return (TD_MALLOC);
ret = ps_pread(ta->ph, (psaddr_t)ta->thread_keytable_addr, keytable,
ta->thread_max_keys * ta->thread_size_key);
if (ret != 0) {
free(keytable);
return (P2T(ret));
}
for (i = 0; i < ta->thread_max_keys; i++) {
allocated = *(int *)(keytable + i * ta->thread_size_key +
ta->thread_off_key_allocated);
destructor = *(void **)(keytable + i * ta->thread_size_key +
ta->thread_off_key_destructor);
if (allocated) {
ret = (ki)(i, destructor, arg);
if (ret != 0) {
free(keytable);
return (TD_DBERR);
}
}
}
free(keytable);
return (TD_OK);
}
static td_err_e
pt_ta_event_addr(const td_thragent_t *ta, td_event_e event, td_notify_t *ptr)
{
TDBG_FUNC();
return (TD_NOEVENT);
}
static td_err_e
pt_ta_set_event(const td_thragent_t *ta, td_thr_events_t *events)
{
TDBG_FUNC();
return (TD_ERR);
}
static td_err_e
pt_ta_clear_event(const td_thragent_t *ta, td_thr_events_t *events)
{
TDBG_FUNC();
return (TD_ERR);
}
static td_err_e
pt_ta_event_getmsg(const td_thragent_t *ta, td_event_msg_t *msg)
{
TDBG_FUNC();
return (TD_NOMSG);
}
static td_err_e
pt_dbsuspend(const td_thrhandle_t *th, int suspend)
{
td_thragent_t *ta = (td_thragent_t *)th->th_ta;
psaddr_t tcb_addr, tmbx_addr, ptr;
lwpid_t lwp;
uint32_t dflags;
int attrflags, locklevel, ret;
TDBG_FUNC();
ret = pt_validate(th);
if (ret)
return (ret);
if (ta->map[th->th_tid].type == PT_LWP) {
if (suspend)
ret = ps_lstop(ta->ph, ta->map[th->th_tid].lwp);
else
ret = ps_lcontinue(ta->ph, ta->map[th->th_tid].lwp);
return (P2T(ret));
}
ret = ps_pread(ta->ph, ta->map[th->th_tid].thr +
ta->thread_off_attr_flags,
&attrflags, sizeof(attrflags));
if (ret != 0)
return (P2T(ret));
ret = ps_pread(ta->ph, ta->map[th->th_tid].thr +
ta->thread_off_tcb,
&tcb_addr, sizeof(tcb_addr));
if (ret != 0)
return (P2T(ret));
tmbx_addr = tcb_addr + ta->thread_off_tmbx;
ptr = tmbx_addr + offsetof(struct kse_thr_mailbox, tm_lwp);
ret = ps_pread(ta->ph, ptr, &lwp, sizeof(lwpid_t));
if (ret != 0)
return (P2T(ret));
if (lwp != 0) {
/* don't suspend signal thread */
if (attrflags & 0x200)
return (0);
if (attrflags & PTHREAD_SCOPE_SYSTEM) {
/*
* don't suspend system scope thread if it is holding
* some low level locks
*/
ptr = ta->map[th->th_tid].thr + ta->thread_off_kse;
ret = ps_pread(ta->ph, ptr, &ptr, sizeof(ptr));
if (ret != 0)
return (P2T(ret));
ret = ps_pread(ta->ph, ptr + ta->thread_off_kse_locklevel,
&locklevel, sizeof(int));
if (ret != 0)
return (P2T(ret));
if (locklevel <= 0) {
ptr = ta->map[th->th_tid].thr +
ta->thread_off_thr_locklevel;
ret = ps_pread(ta->ph, ptr, &locklevel,
sizeof(int));
if (ret != 0)
return (P2T(ret));
}
if (suspend) {
if (locklevel <= 0)
ret = ps_lstop(ta->ph, lwp);
} else {
ret = ps_lcontinue(ta->ph, lwp);
}
if (ret != 0)
return (P2T(ret));
/* FALLTHROUGH */
} else {
struct ptrace_lwpinfo pl;
if (ptrace(PT_LWPINFO, lwp, (caddr_t) &pl, sizeof(pl)))
return (TD_ERR);
if (suspend) {
if (!(pl.pl_flags & PL_FLAG_BOUND))
ret = ps_lstop(ta->ph, lwp);
} else {
ret = ps_lcontinue(ta->ph, lwp);
}
if (ret != 0)
return (P2T(ret));
/* FALLTHROUGH */
}
}
/* read tm_dflags */
ret = ps_pread(ta->ph,
tmbx_addr + offsetof(struct kse_thr_mailbox, tm_dflags),
&dflags, sizeof(dflags));
if (ret != 0)
return (P2T(ret));
if (suspend)
dflags |= TMDF_SUSPEND;
else
dflags &= ~TMDF_SUSPEND;
ret = ps_pwrite(ta->ph,
tmbx_addr + offsetof(struct kse_thr_mailbox, tm_dflags),
&dflags, sizeof(dflags));
return (P2T(ret));
}
static td_err_e
pt_thr_dbresume(const td_thrhandle_t *th)
{
TDBG_FUNC();
return pt_dbsuspend(th, 0);
}
static td_err_e
pt_thr_dbsuspend(const td_thrhandle_t *th)
{
TDBG_FUNC();
return pt_dbsuspend(th, 1);
}
static td_err_e
pt_thr_validate(const td_thrhandle_t *th)
{
td_thrhandle_t temp;
int ret;
TDBG_FUNC();
ret = pt_ta_map_id2thr(th->th_ta, th->th_tid,
&temp);
return (ret);
}
static td_err_e
pt_thr_get_info(const td_thrhandle_t *th, td_thrinfo_t *info)
{
const td_thragent_t *ta = th->th_ta;
psaddr_t tcb_addr;
uint32_t dflags;
int state;
int ret;
TDBG_FUNC();
ret = pt_validate(th);
if (ret)
return (ret);
memset(info, 0, sizeof(*info));
if (ta->map[th->th_tid].type == PT_LWP) {
info->ti_type = TD_THR_SYSTEM;
info->ti_lid = ta->map[th->th_tid].lwp;
info->ti_tid = th->th_tid;
info->ti_state = TD_THR_RUN;
info->ti_type = TD_THR_SYSTEM;
return (TD_OK);
}
ret = ps_pread(ta->ph, ta->map[th->th_tid].thr + ta->thread_off_tcb,
&tcb_addr, sizeof(tcb_addr));
if (ret != 0)
return (P2T(ret));
ret = ps_pread(ta->ph, ta->map[th->th_tid].thr + ta->thread_off_state,
&state, sizeof(state));
ret = ps_pread(ta->ph,
tcb_addr + ta->thread_off_tmbx +
offsetof(struct kse_thr_mailbox, tm_lwp),
&info->ti_lid, sizeof(lwpid_t));
if (ret != 0)
return (P2T(ret));
ret = ps_pread(ta->ph,
tcb_addr + ta->thread_off_tmbx +
offsetof(struct kse_thr_mailbox, tm_dflags),
&dflags, sizeof(dflags));
if (ret != 0)
return (P2T(ret));
info->ti_ta_p = th->th_ta;
info->ti_tid = th->th_tid;
if (state == ta->thread_state_running)
info->ti_state = TD_THR_RUN;
else if (state == ta->thread_state_zoombie)
info->ti_state = TD_THR_ZOMBIE;
else
info->ti_state = TD_THR_SLEEP;
info->ti_db_suspended = ((dflags & TMDF_SUSPEND) != 0);
info->ti_type = TD_THR_USER;
return (0);
}
static td_err_e
pt_thr_getfpregs(const td_thrhandle_t *th, prfpregset_t *fpregs)
{
const td_thragent_t *ta = th->th_ta;
struct kse_thr_mailbox tmbx;
psaddr_t tcb_addr, tmbx_addr, ptr;
lwpid_t lwp;
int ret;
TDBG_FUNC();
ret = pt_validate(th);
if (ret)
return (ret);
if (ta->map[th->th_tid].type == PT_LWP) {
ret = ps_lgetfpregs(ta->ph, ta->map[th->th_tid].lwp, fpregs);
return (P2T(ret));
}
ret = ps_pread(ta->ph, ta->map[th->th_tid].thr + ta->thread_off_tcb,
&tcb_addr, sizeof(tcb_addr));
if (ret != 0)
return (P2T(ret));
tmbx_addr = tcb_addr + ta->thread_off_tmbx;
ptr = tmbx_addr + offsetof(struct kse_thr_mailbox, tm_lwp);
ret = ps_pread(ta->ph, ptr, &lwp, sizeof(lwpid_t));
if (ret != 0)
return (P2T(ret));
if (lwp != 0) {
ret = ps_lgetfpregs(ta->ph, lwp, fpregs);
return (P2T(ret));
}
ret = ps_pread(ta->ph, tmbx_addr, &tmbx, sizeof(tmbx));
if (ret != 0)
return (P2T(ret));
pt_ucontext_to_fpreg(&tmbx.tm_context, fpregs);
return (0);
}
static td_err_e
pt_thr_getgregs(const td_thrhandle_t *th, prgregset_t gregs)
{
const td_thragent_t *ta = th->th_ta;
struct kse_thr_mailbox tmbx;
psaddr_t tcb_addr, tmbx_addr, ptr;
lwpid_t lwp;
int ret;
TDBG_FUNC();
ret = pt_validate(th);
if (ret)
return (ret);
if (ta->map[th->th_tid].type == PT_LWP) {
ret = ps_lgetregs(ta->ph,
ta->map[th->th_tid].lwp, gregs);
return (P2T(ret));
}
ret = ps_pread(ta->ph, ta->map[th->th_tid].thr + ta->thread_off_tcb,
&tcb_addr, sizeof(tcb_addr));
if (ret != 0)
return (P2T(ret));
tmbx_addr = tcb_addr + ta->thread_off_tmbx;
ptr = tmbx_addr + offsetof(struct kse_thr_mailbox, tm_lwp);
ret = ps_pread(ta->ph, ptr, &lwp, sizeof(lwpid_t));
if (ret != 0)
return (P2T(ret));
if (lwp != 0) {
ret = ps_lgetregs(ta->ph, lwp, gregs);
return (P2T(ret));
}
ret = ps_pread(ta->ph, tmbx_addr, &tmbx, sizeof(tmbx));
if (ret != 0)
return (P2T(ret));
pt_ucontext_to_reg(&tmbx.tm_context, gregs);
return (0);
}
static td_err_e
pt_thr_setfpregs(const td_thrhandle_t *th, const prfpregset_t *fpregs)
{
const td_thragent_t *ta = th->th_ta;
struct kse_thr_mailbox tmbx;
psaddr_t tcb_addr, tmbx_addr, ptr;
lwpid_t lwp;
int ret;
TDBG_FUNC();
ret = pt_validate(th);
if (ret)
return (ret);
if (ta->map[th->th_tid].type == PT_LWP) {
ret = ps_lsetfpregs(ta->ph, ta->map[th->th_tid].lwp, fpregs);
return (P2T(ret));
}
ret = ps_pread(ta->ph, ta->map[th->th_tid].thr +
ta->thread_off_tcb,
&tcb_addr, sizeof(tcb_addr));
if (ret != 0)
return (P2T(ret));
tmbx_addr = tcb_addr + ta->thread_off_tmbx;
ptr = tmbx_addr + offsetof(struct kse_thr_mailbox, tm_lwp);
ret = ps_pread(ta->ph, ptr, &lwp, sizeof(lwpid_t));
if (ret != 0)
return (P2T(ret));
if (lwp != 0) {
ret = ps_lsetfpregs(ta->ph, lwp, fpregs);
return (P2T(ret));
}
/*
* Read a copy of context, this makes sure that registers
* not covered by structure reg won't be clobbered
*/
ret = ps_pread(ta->ph, tmbx_addr, &tmbx, sizeof(tmbx));
if (ret != 0)
return (P2T(ret));
pt_fpreg_to_ucontext(fpregs, &tmbx.tm_context);
ret = ps_pwrite(ta->ph, tmbx_addr, &tmbx, sizeof(tmbx));
return (P2T(ret));
}
static td_err_e
pt_thr_setgregs(const td_thrhandle_t *th, const prgregset_t gregs)
{
const td_thragent_t *ta = th->th_ta;
struct kse_thr_mailbox tmbx;
psaddr_t tcb_addr, tmbx_addr, ptr;
lwpid_t lwp;
int ret;
TDBG_FUNC();
ret = pt_validate(th);
if (ret)
return (ret);
if (ta->map[th->th_tid].type == PT_LWP) {
ret = ps_lsetregs(ta->ph, ta->map[th->th_tid].lwp, gregs);
return (P2T(ret));
}
ret = ps_pread(ta->ph, ta->map[th->th_tid].thr +
ta->thread_off_tcb,
&tcb_addr, sizeof(tcb_addr));
if (ret != 0)
return (P2T(ret));
tmbx_addr = tcb_addr + ta->thread_off_tmbx;
ptr = tmbx_addr + offsetof(struct kse_thr_mailbox, tm_lwp);
ret = ps_pread(ta->ph, ptr, &lwp, sizeof(lwpid_t));
if (ret != 0)
return (P2T(ret));
if (lwp != 0) {
ret = ps_lsetregs(ta->ph, lwp, gregs);
return (P2T(ret));
}
/*
* Read a copy of context, make sure that registers
* not covered by structure reg won't be clobbered
*/
ret = ps_pread(ta->ph, tmbx_addr, &tmbx, sizeof(tmbx));
if (ret != 0)
return (P2T(ret));
pt_reg_to_ucontext(gregs, &tmbx.tm_context);
ret = ps_pwrite(ta->ph, tmbx_addr, &tmbx, sizeof(tmbx));
return (P2T(ret));
}
static td_err_e
pt_thr_event_enable(const td_thrhandle_t *th, int en)
{
TDBG_FUNC();
return (TD_ERR);
}
static td_err_e
pt_thr_set_event(const td_thrhandle_t *th, td_thr_events_t *setp)
{
TDBG_FUNC();
return (TD_ERR);
}
static td_err_e
pt_thr_clear_event(const td_thrhandle_t *th, td_thr_events_t *setp)
{
TDBG_FUNC();
return (TD_ERR);
}
static td_err_e
pt_thr_event_getmsg(const td_thrhandle_t *th, td_event_msg_t *msg)
{
TDBG_FUNC();
return (TD_NOMSG);
}
static td_err_e
pt_thr_sstep(const td_thrhandle_t *th, int step)
{
const td_thragent_t *ta = th->th_ta;
struct kse_thr_mailbox tmbx;
struct reg regs;
psaddr_t tcb_addr, tmbx_addr;
uint32_t dflags;
lwpid_t lwp;
int ret;
TDBG_FUNC();
ret = pt_validate(th);
if (ret)
return (ret);
if (ta->map[th->th_tid].type == PT_LWP)
return (TD_BADTH);
ret = ps_pread(ta->ph, ta->map[th->th_tid].thr +
ta->thread_off_tcb,
&tcb_addr, sizeof(tcb_addr));
if (ret != 0)
return (P2T(ret));
/* Clear or set single step flag in thread mailbox */
ret = ps_pread(ta->ph,
tcb_addr + ta->thread_off_tmbx +
offsetof(struct kse_thr_mailbox, tm_dflags),
&dflags, sizeof(uint32_t));
if (ret != 0)
return (P2T(ret));
if (step != 0)
dflags |= TMDF_SSTEP;
else
dflags &= ~TMDF_SSTEP;
ret = ps_pwrite(ta->ph,
tcb_addr + ta->thread_off_tmbx +
offsetof(struct kse_thr_mailbox, tm_dflags),
&dflags, sizeof(uint32_t));
if (ret != 0)
return (P2T(ret));
/* Get lwp */
ret = ps_pread(ta->ph,
tcb_addr + ta->thread_off_tmbx +
offsetof(struct kse_thr_mailbox, tm_lwp),
&lwp, sizeof(lwpid_t));
if (ret != 0)
return (P2T(ret));
if (lwp != 0)
return (0);
tmbx_addr = tcb_addr + ta->thread_off_tmbx;
/*
* context is in userland, some architectures store
* single step status in registers, we should change
* these registers.
*/
ret = ps_pread(ta->ph, tmbx_addr, &tmbx, sizeof(tmbx));
if (ret == 0) {
pt_ucontext_to_reg(&tmbx.tm_context, ®s);
/* only write out if it is really changed. */
if (pt_reg_sstep(®s, step) != 0) {
pt_reg_to_ucontext(®s, &tmbx.tm_context);
ret = ps_pwrite(ta->ph, tmbx_addr, &tmbx,
sizeof(tmbx));
}
}
return (P2T(ret));
}
static void
pt_unmap_lwp(const td_thragent_t *ta, lwpid_t lwp)
{
int i;
for (i = 0; i < ta->map_len; ++i) {
if (ta->map[i].type == PT_LWP && ta->map[i].lwp == lwp) {
ta->map[i].type = PT_NONE;
return;
}
}
}
static int
pt_validate(const td_thrhandle_t *th)
{
if (th->th_tid < 0 || th->th_tid >= th->th_ta->map_len ||
th->th_ta->map[th->th_tid].type == PT_NONE)
return (TD_NOTHR);
return (TD_OK);
}
td_err_e
pt_thr_tls_get_addr(const td_thrhandle_t *th, void *_linkmap, size_t offset,
void **address)
{
char *obj_entry;
const td_thragent_t *ta = th->th_ta;
psaddr_t tcb_addr, *dtv_addr, tcb_tp;
int tls_index, ret;
/* linkmap is a member of Obj_Entry */
obj_entry = (char *)_linkmap - ta->thread_off_linkmap;
/* get tlsindex of the object file */
ret = ps_pread(ta->ph,
obj_entry + ta->thread_off_tlsindex,
&tls_index, sizeof(tls_index));
if (ret != 0)
return (P2T(ret));
/* get thread tcb */
ret = ps_pread(ta->ph, ta->map[th->th_tid].thr +
ta->thread_off_tcb,
&tcb_addr, sizeof(tcb_addr));
if (ret != 0)
return (P2T(ret));
/* get dtv array address */
ret = ps_pread(ta->ph, tcb_addr + ta->thread_off_dtv,
&dtv_addr, sizeof(dtv_addr));
if (ret != 0)
return (P2T(ret));
/* now get the object's tls block base address */
ret = ps_pread(ta->ph, &dtv_addr[tls_index+1], address,
sizeof(*address));
if (ret != 0)
return (P2T(ret));
*address += offset;
return (TD_OK);
}
struct ta_ops libpthread_db_ops = {
.to_init = pt_init,
.to_ta_clear_event = pt_ta_clear_event,
.to_ta_delete = pt_ta_delete,
.to_ta_event_addr = pt_ta_event_addr,
.to_ta_event_getmsg = pt_ta_event_getmsg,
.to_ta_map_id2thr = pt_ta_map_id2thr,
.to_ta_map_lwp2thr = pt_ta_map_lwp2thr,
.to_ta_new = pt_ta_new,
.to_ta_set_event = pt_ta_set_event,
.to_ta_thr_iter = pt_ta_thr_iter,
.to_ta_tsd_iter = pt_ta_tsd_iter,
.to_thr_clear_event = pt_thr_clear_event,
.to_thr_dbresume = pt_thr_dbresume,
.to_thr_dbsuspend = pt_thr_dbsuspend,
.to_thr_event_enable = pt_thr_event_enable,
.to_thr_event_getmsg = pt_thr_event_getmsg,
.to_thr_get_info = pt_thr_get_info,
.to_thr_getfpregs = pt_thr_getfpregs,
.to_thr_getgregs = pt_thr_getgregs,
.to_thr_set_event = pt_thr_set_event,
.to_thr_setfpregs = pt_thr_setfpregs,
.to_thr_setgregs = pt_thr_setgregs,
.to_thr_validate = pt_thr_validate,
.to_thr_tls_get_addr = pt_thr_tls_get_addr,
/* FreeBSD specific extensions. */
.to_thr_sstep = pt_thr_sstep,
};