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pc64: syscallfmt for nsec syscall

--- a/sys/src/9/port/syscallfmt.c

+++ b/sys/src/9/port/syscallfmt.c

@@ -298,6 +298,8 @@

 		}

 		break;

 	case _NSEC:

+		if(sizeof(uintptr) == sizeof(vlong))

+			break;

 		v = va_arg(list, vlong*);

 		fmtprint(&fmt, "%#p", v);

 		break;

@@ -324,14 +326,6 @@

 	errstr = "\"\"";

 	switch(syscallno){

-	default:

-	case ALARM:

-	case _WRITE:

-	case PWRITE:

-		if((long)ret == -1)

-			errstr = up->syserrstr;

-		fmtprint(&fmt, " = %ld", (long)ret);

-		break;

 	case EXEC:

 	case SEGBRK:

 	case SEGATTACH:

@@ -401,6 +395,20 @@

 			vl = va_arg(list, vlong);

 			fmtprint(&fmt, " %lld", vl);

 		}

+		fmtprint(&fmt, " = %ld", (long)ret);

+		break;

+	case _NSEC:

+		if(sizeof(uintptr) == sizeof(vlong)){

+			fmtprint(&fmt, " = %lld", (vlong)ret);

+			break;

+		}

+		/* wet floor */

+	case ALARM:

+	case _WRITE:

+	case PWRITE:

+	default:

+		if((long)ret == -1)

+			errstr = up->syserrstr;

 		fmtprint(&fmt, " = %ld", (long)ret);

 		break;

 	}