diff --git a/kernel/debug.h b/kernel/debug.h
index 71e874317..534ae06a5 100644
--- a/kernel/debug.h
+++ b/kernel/debug.h
@@ -7,6 +7,7 @@
  * other kernel headers.
  */
 
+#include <ansi.h>
 #include "config.h"
 
 /* Enable prints such as
diff --git a/kernel/exception.c b/kernel/exception.c
index def5a7e07..d269f4af9 100755
--- a/kernel/exception.c
+++ b/kernel/exception.c
@@ -57,6 +57,17 @@ unsigned vec_nr;
    * k_reenter larger than zero.
    */
   if (k_reenter == 0 && ! iskernelp(saved_proc)) {
+#if 0
+	{
+		kprintf(
+		"exception for process %d, pc = 0x%x:0x%x, sp = 0x%x:0x%x\n",
+			proc_nr(saved_proc),
+			saved_proc->p_reg.cs, saved_proc->p_reg.pc,
+			saved_proc->p_reg.ss, saved_proc->p_reg.sp);
+		kprintf("edi = 0x%x\n", saved_proc->p_reg.di);
+	}
+#endif
+
 	cause_sig(proc_nr(saved_proc), ep->signum);
 	return;
   }
diff --git a/kernel/main.c b/kernel/main.c
index 33bf1e71f..e521011b8 100755
--- a/kernel/main.c
+++ b/kernel/main.c
@@ -38,7 +38,7 @@ PUBLIC void main()
   register int i, s;
   int hdrindex;			/* index to array of a.out headers */
   phys_clicks text_base;
-  vir_clicks text_clicks, data_clicks;
+  vir_clicks text_clicks, data_clicks, st_clicks;
   reg_t ktsb;			/* kernel task stack base */
   struct exec e_hdr;		/* for a copy of an a.out header */
 
@@ -108,14 +108,21 @@ PUBLIC void main()
 	/* Convert addresses to clicks and build process memory map */
 	text_base = e_hdr.a_syms >> CLICK_SHIFT;
 	text_clicks = (e_hdr.a_text + CLICK_SIZE-1) >> CLICK_SHIFT;
-	if (!(e_hdr.a_flags & A_SEP)) text_clicks = 0;	   /* common I&D */
-	data_clicks = (e_hdr.a_total + CLICK_SIZE-1) >> CLICK_SHIFT;
+	data_clicks = (e_hdr.a_data+e_hdr.a_bss + CLICK_SIZE-1) >> CLICK_SHIFT;
+	st_clicks= (e_hdr.a_total + CLICK_SIZE-1) >> CLICK_SHIFT;
+	if (!(e_hdr.a_flags & A_SEP))
+	{
+		data_clicks= (e_hdr.a_text+e_hdr.a_data+e_hdr.a_bss +
+			CLICK_SIZE-1) >> CLICK_SHIFT;
+		text_clicks = 0;	   /* common I&D */
+	}
 	rp->p_memmap[T].mem_phys = text_base;
 	rp->p_memmap[T].mem_len  = text_clicks;
 	rp->p_memmap[D].mem_phys = text_base + text_clicks;
 	rp->p_memmap[D].mem_len  = data_clicks;
-	rp->p_memmap[S].mem_phys = text_base + text_clicks + data_clicks;
-	rp->p_memmap[S].mem_vir  = data_clicks;	/* empty - stack is in data */
+	rp->p_memmap[S].mem_phys = text_base + text_clicks + st_clicks;
+	rp->p_memmap[S].mem_vir  = st_clicks;
+	rp->p_memmap[S].mem_len  = 0;
 
 	/* Set initial register values.  The processor status word for tasks 
 	 * is different from that of other processes because tasks can
@@ -138,7 +145,7 @@ PUBLIC void main()
 		rp->p_rts_flags = 0;		/* runnable if no flags */
 		lock_enqueue(rp);		/* add to scheduling queues */
 	} else {
-		rp->p_rts_flags = NO_MAP;	/* prevent from running */
+		rp->p_rts_flags = NO_PRIORITY;	/* prevent from running */
 	}
 
 	/* Code and data segments must be allocated in protected mode. */
diff --git a/kernel/proc.h b/kernel/proc.h
index ec51bacbb..728190ceb 100755
--- a/kernel/proc.h
+++ b/kernel/proc.h
@@ -61,15 +61,14 @@ struct proc {
 
 /* Bits for the runtime flags. A process is runnable iff p_rts_flags == 0. */
 #define SLOT_FREE	0x01	/* process slot is free */
-#define NO_MAP		0x02	/* keeps unmapped forked child from running */
+#define NO_PRIORITY     0x02	/* process has been stopped */
 #define SENDING		0x04	/* process blocked trying to send */
 #define RECEIVING	0x08	/* process blocked trying to receive */
 #define SIGNALED	0x10	/* set when new kernel signal arrives */
 #define SIG_PENDING	0x20	/* unready while signal being processed */
 #define P_STOP		0x40	/* set when process is being traced */
 #define NO_PRIV		0x80	/* keep forked system process from running */
-#define NO_PRIORITY    0x100	/* process has been stopped */
-#define NO_ENDPOINT    0x200	/* process cannot send or receive messages */
+#define NO_ENDPOINT    0x100	/* process cannot send or receive messages */
 
 /* Misc flags */
 #define REPLY_PENDING	0x01	/* reply to IPC_REQUEST is pending */
diff --git a/kernel/proto.h b/kernel/proto.h
index 738dfbe96..ab031d450 100755
--- a/kernel/proto.h
+++ b/kernel/proto.h
@@ -61,6 +61,9 @@ _PROTOTYPE( phys_bytes umap_bios, (struct proc *rp, vir_bytes vir_addr,
 		vir_bytes bytes)					);
 _PROTOTYPE( void clear_endpoint, (struct proc *rc)			);
 
+/* system/do_newmap.c */
+_PROTOTYPE( int newmap, (struct proc *rp, struct mem_map *map_ptr)	);
+
 #if (CHIP == INTEL)
 
 /* exception.c */
diff --git a/kernel/system/do_endksig.c b/kernel/system/do_endksig.c
index 63d4b20a6..642a77669 100644
--- a/kernel/system/do_endksig.c
+++ b/kernel/system/do_endksig.c
@@ -28,7 +28,7 @@ message *m_ptr;			/* pointer to request message */
    * process is already dead its flags will be reset. 
    */
   if(!isokendpt(m_ptr->SIG_ENDPT, &proc))
-    return EINVAL;
+	return EINVAL;
 
   rp = proc_addr(proc);
   if (! (rp->p_rts_flags & SIG_PENDING)) return(EINVAL);
diff --git a/kernel/system/do_fork.c b/kernel/system/do_fork.c
index aba2715ac..18437425e 100644
--- a/kernel/system/do_fork.c
+++ b/kernel/system/do_fork.c
@@ -28,6 +28,7 @@ register message *m_ptr;	/* pointer to request message */
 #endif
   register struct proc *rpc;		/* child process pointer */
   struct proc *rpp;			/* parent process pointer */
+  struct mem_map *map_ptr;	/* virtual address of map inside caller (PM) */
   int i, gen;
   int p_proc;
 
@@ -37,6 +38,8 @@ register message *m_ptr;	/* pointer to request message */
   rpc = proc_addr(m_ptr->PR_SLOT);
   if (isemptyp(rpp) || ! isemptyp(rpc)) return(EINVAL);
 
+  map_ptr= (struct mem_map *) m_ptr->PR_MEM_PTR;
+
   /* Copy parent 'proc' struct to child. And reinitialize some fields. */
   gen = _ENDPOINT_G(rpc->p_endpoint);
 #if (CHIP == INTEL)
@@ -52,7 +55,6 @@ register message *m_ptr;	/* pointer to request message */
   rpc->p_endpoint = _ENDPOINT(gen, rpc->p_nr);	/* new endpoint of slot */
 
   /* Only one in group should have SIGNALED, child doesn't inherit tracing. */
-  rpc->p_rts_flags |= NO_MAP;		/* inhibit process from running */
   rpc->p_rts_flags &= ~(SIGNALED | SIG_PENDING | P_STOP);
   sigemptyset(&rpc->p_pending);
 
@@ -79,7 +81,8 @@ register message *m_ptr;	/* pointer to request message */
   /* Calculate endpoint identifier, so caller knows what it is. */
   m_ptr->PR_ENDPT = rpc->p_endpoint;
 
-  return(OK);
+  /* Install new map */
+  return newmap(rpc, map_ptr);
 }
 
 #endif /* USE_FORK */
diff --git a/kernel/system/do_newmap.c b/kernel/system/do_newmap.c
index 1da7b80ca..fb24fa748 100644
--- a/kernel/system/do_newmap.c
+++ b/kernel/system/do_newmap.c
@@ -28,6 +28,22 @@ message *m_ptr;			/* pointer to request message */
   if (iskerneln(proc)) return(EPERM);
   rp = proc_addr(proc);
 
+  return newmap(rp, map_ptr);
+}
+
+
+/*===========================================================================*
+ *				newmap					     *
+ *===========================================================================*/
+PUBLIC int newmap(rp, map_ptr)
+struct proc *rp;		/* process whose map is to be loaded */
+struct mem_map *map_ptr;	/* virtual address of map inside caller (PM) */
+{
+/* Fetch the memory map from PM. */
+  phys_bytes src_phys;		/* physical address of map at the PM */
+  int old_flags;		/* value of flags before modification */
+  int proc;
+
   /* Copy the map from PM. */
   src_phys = umap_local(proc_addr(who_p), D, (vir_bytes) map_ptr, 
       sizeof(rp->p_memmap));
@@ -40,7 +56,6 @@ message *m_ptr;			/* pointer to request message */
   pmmu_init_proc(rp);
 #endif
   old_flags = rp->p_rts_flags;	/* save the previous value of the flags */
-  rp->p_rts_flags &= ~NO_MAP;
   if (old_flags != 0 && rp->p_rts_flags == 0) lock_enqueue(rp);
 
   return(OK);
diff --git a/kernel/system/do_nice.c b/kernel/system/do_nice.c
index 51430a512..bf5aad9e1 100644
--- a/kernel/system/do_nice.c
+++ b/kernel/system/do_nice.c
@@ -49,6 +49,7 @@ PUBLIC int do_nice(message *m_ptr)
        * Put the process back in its new queue if it is runnable.
        */
       lock_dequeue(rp);
+      rp->p_rts_flags &= ~NO_PRIORITY;
       rp->p_max_priority = rp->p_priority = new_q;
       if (! rp->p_rts_flags) lock_enqueue(rp);
 
diff --git a/kernel/table.c b/kernel/table.c
index a5b5a7273..3460ac182 100755
--- a/kernel/table.c
+++ b/kernel/table.c
@@ -80,7 +80,7 @@ PUBLIC char *t_stack[TOT_STACK_SPACE / sizeof(char *)];
 #define RS_C	~0	
 #define DS_C	~0	
 #define PM_C	~(c(SYS_DEVIO) | c(SYS_SDEVIO) | c(SYS_VDEVIO) | c(SYS_IRQCTL) | c(SYS_INT86))
-#define FS_C	(c(SYS_KILL) | c(SYS_VIRCOPY) | c(SYS_VIRVCOPY) | c(SYS_UMAP) | c(SYS_GETINFO) | c(SYS_EXIT) | c(SYS_TIMES) | c(SYS_SETALARM))
+#define FS_C	(c(SYS_KILL) | c(SYS_VIRCOPY) | c(SYS_VIRVCOPY) | c(SYS_UMAP) | c(SYS_GETINFO) | c(SYS_EXIT) | c(SYS_TIMES) | c(SYS_SETALARM) | c(SYS_TRACE))
 #define DRV_C (FS_C | c(SYS_SEGCTL) | c(SYS_IRQCTL) | c(SYS_INT86) | c(SYS_DEVIO) | c(SYS_SDEVIO) | c(SYS_VDEVIO))
 #define TTY_C (DRV_C | c(SYS_ABORT) | c(SYS_VM_MAP) | c(SYS_IOPENABLE))
 #define MEM_C	(DRV_C | c(SYS_PHYSCOPY) | c(SYS_PHYSVCOPY) | c(SYS_VM_MAP) | \