Add mes and mescc-tools-extra

mescc-tools-extra contains two important tools:
- cp
- chmod

mes first builds itself from a mes 0.21 seed as used by guix, and then
builds a mes 0.22 and then mes 0.22 using that created mes 0.22.

It does /not/ use bootstrap.sh as we don't have a proper shell at this
point, it has been manually adapted for kaem.

sysa/mes-0.22/module/mescc/as.scm

@@ -0,0 +1,77 @@
+;;; GNU Mes --- Maxwell Equations of Software
+;;; Copyright © 2016,2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+;;;
+;;; This file is part of GNU Mes.
+;;;
+;;; GNU Mes is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Mes is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (mescc as)
+  #:use-module (srfi srfi-1)
+  #:use-module (mes guile)
+  #:use-module (mescc bytevectors)
+  #:use-module (mescc info)
+  #:export (as
+            dec->hex
+            int->bv8
+            int->bv16
+            int->bv32
+            int->bv64
+            get-r
+            get-r0
+            get-r1
+            get-r-1))
+
+(define (int->bv64 value)
+  (let ((bv (make-bytevector 8)))
+    (bytevector-u64-native-set! bv 0 value)
+    bv))
+
+(define (int->bv32 value)
+  (let ((bv (make-bytevector 4)))
+    (bytevector-u32-native-set! bv 0 value)
+    bv))
+
+(define (int->bv16 value)
+  (let ((bv (make-bytevector 2)))
+    (bytevector-u16-native-set! bv 0 value)
+    bv))
+
+(define (int->bv8 value)
+  (let ((bv (make-bytevector 1)))
+    (bytevector-u8-set! bv 0 value)
+    bv))
+
+(define (dec->hex o)
+  (cond ((number? o) (number->string o 16))
+        ((char? o) (number->string (char->integer o) 16))
+        (else (format #f "~s" o))))
+
+(define (as info instruction . rest)
+  (if (pair? instruction)
+      (append-map (lambda (o) (apply as (cons* info o rest))) instruction)
+      (let ((proc (assoc-ref (.instructions info) instruction)))
+        (if (not proc) (error "no such instruction" instruction)
+            (apply proc info rest)))))
+
+(define (get-r info)
+  (car (if (pair? (.allocated info)) (.allocated info) (.registers info))))
+
+(define (get-r0 info)
+  (cadr (.allocated info)))
+
+(define (get-r1 info)
+  (car (.allocated info)))
+
+(define (get-r-1 info)
+  (caddr (.allocated info)))