1 | ;;;-*-Mode: LISP; Package: CCL -*- |
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2 | ;;; |
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3 | ;;; Copyright (C) 2001-2009 Clozure Associates |
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4 | ;;; This file is part of Clozure CL. |
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5 | ;;; |
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6 | ;;; Clozure CL is licensed under the terms of the Lisp Lesser GNU Public |
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7 | ;;; License , known as the LLGPL and distributed with Clozure CL as the |
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8 | ;;; file "LICENSE". The LLGPL consists of a preamble and the LGPL, |
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9 | ;;; which is distributed with Clozure CL as the file "LGPL". Where these |
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10 | ;;; conflict, the preamble takes precedence. |
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11 | ;;; |
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12 | ;;; Clozure CL is referenced in the preamble as the "LIBRARY." |
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13 | ;;; |
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14 | ;;; The LLGPL is also available online at |
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15 | ;;; http://opensource.franz.com/preamble.html |
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16 | |
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17 | ;;; "Generic" syscall sypport. |
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18 | |
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19 | (in-package "CCL") |
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20 | |
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21 | (defpackage "SYSCALLS" (:use)) |
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22 | |
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23 | (defstruct syscall |
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24 | (idx 0 :type fixnum) |
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25 | (arg-specs () :type list) |
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26 | (result-spec nil :type symbol) |
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27 | (min-args 0 :type fixnum)) |
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28 | |
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29 | (defvar *os-syscall-definitions* ()) |
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30 | |
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31 | (defun platform-syscall-definitions (platform-os) |
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32 | (or (getf *os-syscall-definitions* platform-os) |
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33 | (setf (getf *os-syscall-definitions* platform-os) |
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34 | (make-hash-table :test 'eq)))) |
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35 | |
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36 | (defun backend-syscall-definitions (backend) |
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37 | (platform-syscall-definitions (backend-platform-syscall-mask backend))) |
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38 | |
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39 | |
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40 | |
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41 | (defmacro define-syscall (platform name idx (&rest arg-specs) result-spec |
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42 | &key (min-args (length arg-specs))) |
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43 | `(progn |
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44 | (setf (gethash ',name (platform-syscall-definitions ,platform)) |
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45 | (make-syscall :idx ,idx |
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46 | :arg-specs ',arg-specs |
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47 | :result-spec ',result-spec |
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48 | :min-args ,min-args)) |
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49 | ',name)) |
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50 | |
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51 | (defmacro syscall (name &rest args) |
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52 | (let* ((info (or (gethash name (backend-syscall-definitions *target-backend*)) |
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53 | (error "Unknown system call: ~s" name))) |
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54 | (idx (syscall-idx info)) |
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55 | (arg-specs (syscall-arg-specs info)) |
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56 | (n-argspecs (length arg-specs)) |
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57 | (n-args (length args)) |
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58 | (min-args (syscall-min-args info)) |
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59 | (result (syscall-result-spec info))) |
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60 | (unless (and (>= n-args min-args) (<= n-args n-argspecs)) |
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61 | (error "wrong number of args in ~s" args)) |
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62 | (do* ((call ()) |
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63 | (specs arg-specs (cdr specs)) |
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64 | (args args (cdr args))) |
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65 | ((null args) |
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66 | `(%syscall ,idx ,@(nreverse (cons result call)))) |
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67 | (push (car specs) call) |
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68 | (push (car args) call)))) |
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