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/*

 **************************************************************************

 *

 *  Component:  RDB servers

 *  Module:     servtgt.c

 *

 * $Id: servtgt.c,v 1.2 2001-09-27 12:02:01 chris Exp $

 *

 **************************************************************************

 */

#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 */