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/*
* Copyright 2006 The Android Open Source Project
*/
#include <dirent.h>
#include <sys/ptrace.h>
#include <stdint.h>
#include <thread_db.h>
#include <stdlib.h>
#include <stdio.h>
extern int ps_pglobal_lookup (void *, const char *obj, const char *name, void **sym_addr);
struct ps_prochandle
{
pid_t pid;
};
/*
* This is the list of "special" symbols we care about whose addresses are
* cached by gdbserver from the host at init time.
*/
enum {
SYM_TD_CREATE,
SYM_THREAD_LIST,
NUM_SYMS
};
static char const * gSymbols[] = {
[SYM_TD_CREATE] = "_thread_created_hook",
NULL
};
char const **
td_symbol_list(void)
{
return gSymbols;
}
td_err_e
td_ta_new(struct ps_prochandle const * proc_handle, td_thragent_t ** agent_out)
{
td_thragent_t * agent;
agent = (td_thragent_t *)malloc(sizeof(td_thragent_t));
if (!agent) {
return TD_MALLOC;
}
agent->pid = proc_handle->pid;
*agent_out = agent;
return TD_OK;
}
td_err_e
td_ta_set_event(td_thragent_t const * agent, td_thr_events_t * events)
{
return TD_OK;
}
static td_thrhandle_t gEventMsgHandle;
static int
_event_getmsg_helper(td_thrhandle_t const * handle, void * bkpt_addr)
{
void * pc;
pc = (void *)ptrace(PTRACE_PEEKUSR, handle->tid, (void *)60 /* r15/pc */, NULL);
if (pc == bkpt_addr) {
// The hook function takes the id of the new thread as it's first param,
// so grab it from r0.
gEventMsgHandle.pid = ptrace(PTRACE_PEEKUSR, handle->tid, (void *)0 /* r0 */, NULL);
gEventMsgHandle.tid = gEventMsgHandle.pid;
return 0x42;
}
return 0;
}
td_err_e
td_ta_event_getmsg(td_thragent_t const * agent, td_event_msg_t * event)
{
td_err_e err;
void * bkpt_addr;
err = ps_pglobal_lookup(NULL, NULL, gSymbols[SYM_TD_CREATE], &bkpt_addr);
if (err) {
return err;
}
err = td_ta_thr_iter(agent, _event_getmsg_helper, bkpt_addr, 0, 0, NULL, 0);
if (err != 0x42) {
return TD_NOMSG;
}
event->event = TD_CREATE;
event->th_p = &gEventMsgHandle; // Nasty hack, but it's the only way!
return TD_OK;
}
td_err_e
td_thr_get_info(td_thrhandle_t const * handle, td_thrinfo_t * info)
{
info->ti_tid = handle->tid;
info->ti_lid = handle->tid; // Our pthreads uses kernel ids for tids
info->ti_state = TD_THR_SLEEP; /* XXX this needs to be read from /proc/<pid>/task/<tid>.
This is only used to see if the thread is a zombie or not */
return TD_OK;
}
td_err_e
td_thr_event_enable(td_thrhandle_t const * handle, td_event_e event)
{
// I don't think we need to do anything here...
return TD_OK;
}
td_err_e
td_ta_event_addr(td_thragent_t const * agent, td_event_e event, td_notify_t * notify_out)
{
int32_t err;
/*
* This is nasty, ps_pglobal_lookup is implemented in gdbserver and looks up
* the symbol from it's cache, which is populated at start time with the
* symbols returned from td_symbol_list via calls back to the host.
*/
switch (event) {
case TD_CREATE:
err = ps_pglobal_lookup(NULL, NULL, gSymbols[SYM_TD_CREATE], ¬ify_out->u.bptaddr);
if (err) {
return TD_NOEVENT;
}
return TD_OK;
}
return TD_NOEVENT;
}
td_err_e
td_ta_thr_iter(td_thragent_t const * agent, td_thr_iter_f * func, void * cookie,
td_thr_state_e state, int32_t prio, sigset_t * sigmask, uint32_t user_flags)
{
td_err_e err = TD_OK;
char path[32];
DIR * dir;
struct dirent * entry;
td_thrhandle_t handle;
snprintf(path, sizeof(path), "/proc/%d/task/", agent->pid);
dir = opendir(path);
if (!dir) {
return TD_NOEVENT;
}
handle.pid = agent->pid;
while ((entry = readdir(dir)) != NULL) {
if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0) {
continue;
}
handle.tid = atoi(entry->d_name);
err = func(&handle, cookie);
if (err) {
break;
}
}
closedir(dir);
return err;
}
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