/*
**************************************************************************
*
* Component: RDB servers
* Module: servtgt.c
*
* $Id$
*
**************************************************************************
*/
#include <string.h>
#include <sys/errno.h>
#include <rdbg/rdbg.h>
#include <rdbg/servrpc.h>
#include <sys/socket.h>
#include <assert.h>
#ifdef DDEBUG
#define Ptrace TgtDbgPtrace
#else
#define Ptrace TgtRealPtrace
#endif
/*
* TgtBreakRestoreOrig - Restore original instruction at "addr"
* just before single-stepping it.
*/
int
TgtBreakRestoreOrig (int pid, void *addr, void *addr2)
/*
* Process identifier
*/
/*
* Breakpoint address
*/
/*
* Original instruction or bkpt number
*/
{
int ret;
int l;
l = (long) Ptrace (RPT_PEEKTEXT, pid, addr, 0, NULL); /* assume ok */
ret = ORG_BREAK (l, (UINT32) addr2); /* reconstruct old instr */
ret = Ptrace (RPT_POKETEXT, pid, addr, ret, NULL); /* poke back old */
return ret;
}
/*
*
* TgtBreakCancelStep - Restore the breakpoint at "addr" if the single-step
* has failed at the ptrace level.
*/
#define BKPT0(plst) ((BASE_BREAK*)(plst)->break_list)
void
TgtBreakCancelStep (PID_LIST * plst)
{
assert (plst->break_list);
assert (BKPT0 (plst)->clr_step);
if (plst->break_list && BKPT0 (plst)->clr_step) {
int idx = BKPT0 (plst)->last_break;
int data;
data = Ptrace (RPT_PEEKTEXT, plst->pid,
(char *) plst->break_list[idx].ee_loc, 0, NULL);
assert (!IS_BREAK (data));
Ptrace (RPT_POKETEXT, plst->pid,
(char *) plst->break_list[idx].ee_loc,
(int) SET_BREAK (data), NULL);
}
}
/*
* TgtCreateNew - add a new process into the process management lists.
*/
void
TgtCreateNew (PID pid, int conn, INT32 child, char *name, Boolean spawn)
{
int idx;
for (idx = 0; idx < pid_list_cnt; idx++)
if (!pid_list[idx].pid)
break; /* find empty */
if (idx >= pid_list_cnt) { /* no empties, add more */
PID_LIST *tmp_pid_list = pid_list;
pid_list_cnt += PID_LIST_INC;
pid_list = (PID_LIST *) Realloc (pid_list, /* get new or extend */
pid_list_cnt * sizeof (PID_LIST));
if (!pid_list) { /* out of memory */
pid_list_cnt -= PID_LIST_INC;
if (pid_list_cnt) { /* realloc failed - malloc again */
pid_list = tmp_pid_list;
/*
* above relies on old pointer being valid after failed realloc
*/
}
return; /* failed */
}
/*
* now clear newly added space
*/
memset (pid_list + pid_list_cnt - PID_LIST_INC, 0,
PID_LIST_INC * sizeof (PID_LIST));
idx = pid_list_cnt - PID_LIST_INC;
} else /* clear entry we found */
memset (&pid_list[idx], 0, sizeof (PID_LIST));
/*
* now fill in empty entry
*/
pid_list[idx].pid = pid;
pid_list[idx].running = 1; /* we have not called wait yet */
pid_list[idx].primary_conn = (UCHAR) conn; /* primary owner */
if (conn != -1) { /* found caller */
pid_list[idx].owners = 1;
PIDMAP_SET (conn, idx); /* mask in */
}
pid_list[idx].thread = (UINT32) - 1; /* no thread for now */
pid_list[idx].last_start = LAST_START; /* handle MiX bug */
pid_list[idx].name = name ? (char *) StrDup (name) : (char *) NULL;
}
/*
* TgtNotifyWaitChange - send event to clients indicating child changed state.
*/
void
TgtNotifyWaitChange (PID pid, int status, Boolean exclude)
{
int conn, idx;
idx = FindPidEntry (pid); /* locate the pid that changed */
if (idx < 0) {
DPRINTF (("TgtNotifyWaitChange: pid %d not in our list\n", (int) pid));
return; /* not in our list */
}
pid_list[idx].running = 0; /* not running */
pid_list[idx].state = status; /* save status of stop/term */
if (!pid_list[idx].owners && !STS_SIGNALLED (status))
TgtDelete (&pid_list[idx], -1, 0); /* terminated and no owners */
else { /* normal cases */
for (conn = 0; conn < conn_list_cnt; conn++) { /* now find all interested clients */
if (!conn_list[conn].in_use /* free entry */
|| !PIDMAP_TEST (conn, idx))
continue; /* not using this pid */
if (conn == exclude)
continue; /* do not do this one */
TspSendWaitChange (conn, BMSG_WAIT, 1, pid, 0, False); /* notify of change */
}
}
}
/*
* TgtNotifyAll - send a message to all clients interested in process.
*/
void
TgtNotifyAll (int pid_idx, BACK_MSG msg, UINT16 spec,
UINT32 context, int exclude, Boolean force)
{
int conn;
DPRINTF (("TgtNotifyAll: msg %d (%s) for pid_idx=%d (%d,%d)\n",
msg, BmsgNames[msg], pid_idx, exclude, force));
for (conn = 0; conn < conn_list_cnt; conn++)
if (conn_list[conn].in_use /* not free */
&& PIDMAP_TEST (conn, pid_idx)) {
if (conn != exclude)
TspSendWaitChange (conn, msg, spec, pid_list[pid_idx].pid, context,
force);
}
}
/*
* TgtDelete - mark process as now uncontrolled.
*
* Notes:
* - this function removes a process from the process list.
* - the notify argument indicates a message to send if needed.
*/
void
TgtDelete (PID_LIST * plst, int conn_idx, BACK_MSG notify)
{
int idx = plst - pid_list, cnt, conn;
/*
* found
*/
cnt = pid_list[idx].owners;
if (cnt) { /* some connections to break */
for (conn = 0; cnt && conn < conn_list_cnt; conn++)
if (conn_list[conn].in_use /* not free */
&& PIDMAP_TEST (conn, idx)) { /* found one that uses it */
PIDMAP_CLEAR (conn, idx);
if (notify && conn != conn_idx)
TspSendWaitChange (conn, notify, 0, plst->pid, 0, True);
if (!--cnt)
break;
}
}
if (pid_list[idx].name)
Free (pid_list[idx].name); /* free string name back */
/*
* Free breakpoint list
*/
if (pid_list[idx].break_list != NULL) {
Free (pid_list[idx].break_list);
}
pid_list[idx].pid = 0; /* gone */
}
/*
* TgtKillAndDelete - kill or detach process and remove entry.
*/
int
TgtKillAndDelete (PID_LIST * plst, struct svc_req *rqstp, Boolean term)
{
ptrace_in pin; /* used for ptrace call */
ptrace_out *pout;
/*
* Remove breakpoints
*/
if (plst->break_alloc > 0) {
pin.pid = plst->pid;
pin.addr.req = RPT_CLRBREAK;
pin.data = 0; /* clear all */
pin.flags = PTRFLG_NON_OWNER;
pout = RPCGENSRVNAME (ptrace_2_svc) (&pin, rqstp);
if (pout->result < 0) {
DPRINTF (("TgtKillAndDelete: RPT_CLRBREAK failed %d\n", getErrno ()));
return -1;
}
}
if (term) { /* kill */
pin.addr.ptrace_addr_data_in_u.address = 0;
pin.data = -1; /* Don't want notification from slave */
pin.addr.req = RPT_KILL;
} else { /* detach */
pin.addr.ptrace_addr_data_in_u.address = 1;
pin.data = 0;
pin.addr.req = RPT_DETACH;
}
pin.pid = plst->pid;
pin.flags = PTRFLG_FREE | PTRFLG_NON_OWNER;
DPRINTF (("TgtKillAndDelete: ptrace_2_svc (%s (%d), %d)\n",
PtraceName (pin.addr.req), pin.addr.req, pin.pid));
pout = RPCGENSRVNAME (ptrace_2_svc) (&pin, rqstp); /* start it */
if (pout->errNo == ESRCH && plst->pid)
TgtDelete (plst, -1, BMSG_KILLED); /* only entry remains */
return 0;
}
/*
* TgtDetachCon - detach a connection's ownership of a process.
*/
void
TgtDetachCon (int conn_idx, int pid_idx, Boolean delete)
{
if ((unsigned) pid_idx >= pid_list_cnt || !pid_list[pid_idx].pid)
return; /* not valid */
if (PIDMAP_TEST (conn_idx, pid_idx)) { /* if an owner, release control */
PIDMAP_CLEAR (conn_idx, pid_idx);
if (pid_list[pid_idx].owners)
pid_list[pid_idx].owners--;
if (pid_list[pid_idx].primary_conn == conn_idx)
pid_list[pid_idx].primary_conn = NO_PRIMARY;
if (delete
&& !pid_list[pid_idx].owners && PROC_TERMINATED (pid_list + pid_idx))
TgtDelete (&pid_list[pid_idx], -1, 0); /* remove entry */
}
}
/* -----------------------------------------------------------------------
TgtHandleChildChange - decide what action to take after wait() returns.
Used in the master only.
----------------------------------------------------------------------- */
#ifdef DDEBUG
static char *LastStartNames[] = {
"NONE", "STEP", "CONT", "RANGE",
"STEPOFF", "KILLED", "DETACHED"
};
char *
GetLastStartName (int last_start)
{
static char buf[32];
strcpy (buf, LastStartNames[last_start & ~LAST_START]);
if (last_start & LAST_START) {
strcat (buf, "+START");
}
return buf;
}
#endif
Boolean
TgtHandleChildChange (PID pid, int *status, int *unexp,
CPU_Exception_frame * ctx)
{ /* return False if continue, else stop */
int idx, sig;
int bidx = 0;
PID_LIST *plst;
unsigned long PC;
BASE_BREAK *base = NULL; /* break_list[0] is really BASE_BREAK */
int hadStepEmul;
int origHadStepEmul;
int stopWanted;
DPRINTF (("TgtHandleChildChange: pid %d status %x cap\n",
(int) pid, *status));
if (unexp)
*unexp = 0; /* initialize to ok */
/*
* first, find pid in question
*/
idx = FindPidEntry (pid);
if (idx < 0) { /* cannot locate this process */
DPRINTF (("TgtHandleChildChange: unknown process (%s pid)\n",
FindPidEntry (pid) >= 0 ? "stale" : "unknown"));
if (unexp)
*unexp = 1; /* Unexpected change */
return (False); /* unknown: ignore (used to stop and notify) */
}
/*
* found
*/
plst = &pid_list[idx]; /* pointer to entry */
/*
* first we see if just stopped
*/
/*
* copy ctxt
*/
CtxToRegs (ctx, &(plst->regs));
stopWanted = plst->stop_wanted;
plst->stop_wanted = 0; /* For the next time */
hadStepEmul = BreakClear (plst, -1, -1) > 0;
origHadStepEmul = hadStepEmul; /* hadStepEmul is cleared if real bkpt met */
if (STS_SIGNALLED (*status)) { /* stopped, not terminated */
sig = STS_GETSIG (*status); /* signal that stopped us */
/*
* now, we read the registers and see what to do next
*/
if (TgtPtrace (RPT_GETREGS, pid, (void *) &plst->regs, 0, NULL) < 0) {
memset (&plst->regs, 0, sizeof (plst->regs));
}
/*
* Get current thread
*/
plst->thread = TgtPtrace (RPT_GETTARGETTHREAD, pid, NULL, 0, NULL);
if (sig == SIGTRAP) { /* stopped from break/step */
PC = plst->regs.REG_PC;
/*
* Must check PC to see whether in situations where we had
* step emulation we are on a breakpoint or just
* have returned from an emulated single-step
*/
if (BreakIdentify (plst, 0 /*no adjust */ , -1 /*no thread */ ) > 0) {
hadStepEmul = 0;
}
plst->is_step = hadStepEmul || IS_STEP (plst->regs)
|| plst->last_start == LAST_START;
DPRINTF (("TgtHandleChildChange: %s last_start %s\n", plst->is_step
? "step" : "break", GetLastStartName (plst->last_start)));
if ((plst->is_step || origHadStepEmul || stopWanted)
&& (plst->last_start == LAST_STEP
|| plst->last_start == LAST_STEPOFF
|| plst->last_start == LAST_RANGE)) {
DPRINTF (("TgtHandleChildChange: restoring stepped-off bkpt\n"));
BreakSteppedOff (plst);
}
if (plst->last_start == LAST_STEPOFF && (plst->is_step || origHadStepEmul)) { /* stepped off break and now need cont */
DPRINTF (("TgtHandleChildChange: auto-resuming after step-off\n"));
plst->last_start = LAST_CONT; /* convert to normal cont */
if (!stopWanted) {
if (TgtPtrace (RPT_CONT, pid, (char *) 1, 0, NULL))
return True; /* tell people */
return (False); /* wait for change */
}
DPRINTF (("TgtHandleChildChange: stop_wanted %d in step-off\n",
stopWanted));
*status = STS_MAKESIG (stopWanted);
return True; /* Stop and notify */
}
base = plst->break_list ? ((BASE_BREAK *) plst->break_list) :
((BASE_BREAK *) NULL);
/*
* now see if step in range
*/
if (plst->last_start == LAST_RANGE /* step in range */
&& (plst->is_step || origHadStepEmul) /* not a breakpoint */
&&PC >= base->range_start && PC <= base->range_end) { /* still in range, keep going */
if (stopWanted) {
DPRINTF (("TgtHandleChildChange: stop_wanted %d in step-range\n",
stopWanted));
} else {
DPRINTF (("TgtHandleChildChange: Reservation at %x\n",
plst->regs.REG_PC));
}
}
if (!plst->is_step) { /* was break */
bidx = BreakIdentify (plst, 1 /*adjust */ , plst->thread);
if (bidx == 0) {
DPRINTF (("TgtHandleChildChange: forwarding bkpt to kernel\n"));
if (unexp) {
*unexp = 1;
}
return False;
}
if (bidx < 0) { /* Unwanted breakpoint, must step it off */
ptrace_in pin;
ptrace_out *out;
if (origHadStepEmul) {
DPRINTF (("TgtHandleChildChange: bkpt %x becomes step\n",
plst->regs.REG_PC));
bidx = -bidx;
plst->is_step = 1;
base->clr_step = plst->break_list[bidx].type == BRKT_INSTR;
base->last_break = bidx;
return True;
}
if (stopWanted) {
DPRINTF (("TgtHandleChildChange: stop_wanted %d at bkpt %x\n",
stopWanted, plst->regs.REG_PC));
/*
* The PC has already been adjusted by BreakIdentify
*/
*status = STS_MAKESIG (stopWanted);
return True;
}
/*
* All the handling is done in ptrace_2_svc() so call it
*/
bidx = -bidx;
DPRINTF (("TgtHandleChildChange: last %d (%s) restarting bkpt %d\n",
plst->last_start, GetLastStartName (plst->last_start),
bidx));
base->clr_step = 1;
base->last_break = bidx; /* remember which one */
plst->running = 0; /* So that ptrace is accepted */
pin.pid = plst->pid;
if (plst->last_start == LAST_STEP) {
pin.addr.req = RPT_SINGLESTEP;
} else {
pin.addr.req = RPT_CONT;
}
pin.addr.ptrace_addr_data_in_u.address = 1;
pin.data = 0;
pin.flags = PTRFLG_NON_OWNER;
out = RPCGENSRVNAME (ptrace_2_svc) (&pin, NULL);
if (out->result == 0)
return False; /* Continue waiting */
DPRINTF (("TgtHandleChildChange: failed to restart bkpt!\n"));
/*
* If something went wrong, just stop on breakpoint
*/
}
}
}
/*
* else sig != SIGTRAP
*/
/*
* finally, fill in stop info in break point array base
*/
if (bidx > 0) { /* store break info */
/*
* will need to get off the break for SW breakpoints only
*/
base->clr_step = plst->break_list[bidx].type == BRKT_INSTR;
base->last_break = bidx; /* remember which one */
} else if (base) { /* clear break info */
base->clr_step = False; /* not stopped on break */
base->last_break = 0;
}
/*
* decision to notify owner based on last_start
*/
} /* stopped */
else { /* terminated */
if (plst->last_start == LAST_START) { /* spawn failed */
TgtNotifyAll (idx, BMSG_EXEC_FAIL, 0, 0, -1, True);
plst->running = False; /* not running - dead */
plst->state = *status; /* contains errno in high word */
return (False);
}
else if ((UCHAR) (plst->last_start & ~LAST_START) < (UCHAR) LAST_KILLED)
plst->last_start = LAST_NONE; /* doesn't matter anymore */
else
return (False); /* killed and detach already notified */
}
return (True); /* stop and notify */
}
#ifdef DDEBUG
/*
* TgtDbgPtrace - debug version of ptrace.
*/
int
TgtDbgPtrace (int request, PID pid, char *addr, int data, void *addr2)
{
int diag;
DPRINTF (("TgtDbgPtrace: entered (%s (%d), %d, %x, %d, %x)\n",
PtraceName (request), request, pid, (int) addr, data,
(int) addr2));
if (request == RPT_WRITETEXT || request == RPT_WRITEDATA) {
int i;
DPRINTF (("TgtDbgPtrace:"));
if (rdb_debug) {
for (i = 0; i < data && i < 16; ++i) {
printf (" %02x", ((char *) addr2)[i] & 0xFF);
}
printf ("\n");
}
}
diag = TgtRealPtrace (request, pid, addr, data, addr2);
DPRINTF (("TgtDbgPtrace: returned %d (%x) errno %d\n",
diag, diag, getErrno ()));
if (request == RPT_GETREGS || request == RPT_GETTHREADREGS
|| request == RPT_SETREGS || request == RPT_SETTHREADREGS) {
/*
* Use DPRINTF() so as to have the id prefix
*/
DPRINTF (("TgtDbgPtrace: (%s) PC = %x, SP = %x, FP = %x\n",
PtraceName (request),
((xdr_regs *) addr)->REG_PC,
((xdr_regs *) addr)->REG_SP, ((xdr_regs *) addr)->REG_FP));
}
return (diag);
}
#endif /* DDEBUG */
