mirror of https://github.com/dzavalishin/oskit/
89 lines
2.6 KiB
Awk
89 lines
2.6 KiB
Awk
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#
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# Copyright (c) 1994, 1998 University of Utah and the Flux Group.
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# All rights reserved.
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#
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# This file is part of the Flux OSKit. The OSKit is free software, also known
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# as "open source;" you can redistribute it and/or modify it under the terms
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# of the GNU General Public License (GPL), version 2, as published by the Free
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# Software Foundation (FSF). To explore alternate licensing terms, contact
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# the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
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#
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# The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
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# received a copy of the GPL along with the OSKit; see the file COPYING. If
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# not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
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#
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# This awk program takes a `.sym' file and produces a `.c' file,
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# which can then be compiled to assembly language
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# and run through a magic sed transformation (see GNUmakerules),
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# to produce a `.h' file containing absolute numeric symbol definitions
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# suitable for inclusion in assembly language source files and such.
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# This way, convenient symbols can be defined based on structure offsets,
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# arbitrary C expressions including sizeof() expressions, etc.
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#
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# Since this mechanism doesn't depend on running a program
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# on the machine the code is to run on (the host machine),
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# things still work fine during cross-compilation.
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#
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BEGIN {
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bogus_printed = "no"
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}
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# Start the bogus function just before the first sym directive,
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# so that any #includes higher in the file don't get stuffed inside it.
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/^[a-z]/ {
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if (bogus_printed == "no")
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{
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print "void bogus() {";
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bogus_printed = "yes";
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}
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}
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# Take an arbitrarily complex C symbol or expression and constantize it.
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/^expr/ {
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print "__asm (\"";
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if ($3 == "")
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printf "* %s mAgIc%%0\" : : \"i\" (%s));\n", $2, $2;
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else
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printf "* %s mAgIc%%0\" : : \"i\" (%s));\n", $3, $2;
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}
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# Output a symbol defining the size of a C structure.
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/^size/ {
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print "__asm (\"";
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if ($4 == "")
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printf "* %s_SIZE mAgIc%%0\" : : \"i\" (sizeof(struct %s)));\n",
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toupper($3), $2;
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else
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printf "* %s mAgIc%%0\" : : \"i\" (sizeof(struct %s)));\n",
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$4, $2;
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}
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# Output a symbol defining the byte offset of an element of a C structure.
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/^offset/ {
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print "__asm (\"";
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if ($5 == "")
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{
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printf "* %s_%s mAgIc%%0\" : : \"i\" (&((struct %s*)0)->%s));\n",
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toupper($3), toupper($4), $2, $4;
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}
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else
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{
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printf "* %s mAgIc%%0\" : : \"i\" (&((struct %s*)0)->%s));\n",
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toupper($5), $2, $4;
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}
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}
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# Copy through all preprocessor directives.
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/^#/ {
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print
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}
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END {
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print "}"
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}
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