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5e: fix _tos->pid / libthread bug

--- a/sys/src/cmd/5e/fns.h

+++ b/sys/src/cmd/5e/fns.h

@@ -35,3 +35,4 @@

 void fpatransfer(u32int);

 void fpaoperation(u32int);

 void fparegtransfer(u32int);

+void inittos(void);

--- a/sys/src/cmd/5e/proc.c

+++ b/sys/src/cmd/5e/proc.c

@@ -108,8 +108,16 @@

 		ap += len;

 	}

 	*(ulong *) vaddrnol(sp, 4) = 0;

+	inittos();

+}

-	((Tos *) vaddrnol(tos, sizeof(Tos)))->pid = getpid();

+void

+inittos(void)

+{

+	ulong tos;

+

+	tos = mach->utop - sizeof(Tos) * 2;

+	((Tos *) vaddrnol(tos, sizeof(Tos)))->pid = P->pid;

 }

 static int

--- a/sys/src/cmd/5e/sys.c

+++ b/sys/src/cmd/5e/sys.c

@@ -401,6 +401,7 @@

 		P = p;

 		atexit(cleanup);

 		P->pid = getpid();

+		inittos();

 		addproc(P);

 	}

 	P->R[0] = rc;