48 lines
1.6 KiB
Scheme
48 lines
1.6 KiB
Scheme
;;; -*-scheme-*-
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;;; Mes --- Maxwell Equations of Software
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;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
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;;;
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;;; scm.mes: This file is part of Mes.
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;;;
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;;; Mes is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; Mes is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with Mes. If not, see <http://www.gnu.org/licenses/>.
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(define (i386:puts data length)
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`(
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#xba ,@(int->bv32 length) ;; mov $0xe,%edx
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#xb9 ,@(int->bv32 data) ;; mov $data,%ecx
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#xbb #x01 #x00 #x00 #x00 ;; mov $0x1,%ebx
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#xb8 #x04 #x00 #x00 #x00 ;; mov $0x4,%eax
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#xcd #x80 ;; int $0x80
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))
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(define (i386:exit code)
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`(
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#xbb ,@(int->bv32 code) ;; mov $code,%ebx
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#xb8 #x01 #x00 #x00 #x00 ;; mov $0x1,%eax
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#xcd #x80 ;; int $0x80
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))
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(define data
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(string->list "Hello, world!\n"))
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(define (text d)
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(append
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(i386:puts d (length data))
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(i386:exit 0)
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))
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(define (write-any x) (write-char (if (char? x) x (integer->char x))))
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(map write-any (make-elf text data))
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