99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/*
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* Copyright (c) 2007, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#ifdef __AVR__
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#include <avr/pgmspace.h>
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#endif
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#include "loader/sym.h"
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#include <string.h>
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static union sym_value
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sym_lookup(const char *name, const struct sym_bol *symbols, int nelts)
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{
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union sym_value ret;
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int start, middle, end;
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int r;
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start = 0;
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end = nelts - 1;
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while(start <= end) {
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/* Check middle, divide */
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middle = (start + end) / 2;
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#ifdef __AVR__
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PGM_P addr = (PGM_P)pgm_read_word(&symbols[middle].name);
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r = strcmp_P(name, addr);
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#else
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r = strcmp(name, symbols[middle].name);
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#endif
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if(r < 0) {
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end = middle - 1;
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} else if(r > 0) {
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start = middle + 1;
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} else {
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#ifdef __AVR__
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ret.func = (sym_func_t)pgm_read_word(&symbols[middle].value);
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return ret;
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#else
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return symbols[middle].value;
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#endif
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}
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}
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ret.obj = NULL;
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ret.func = NULL;
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return ret;
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}
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/* Lookup a pointer to an ANSI C object. */
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void *
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sym_object(const char *name)
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{
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union sym_value ret;
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ret = sym_lookup(name, sym_obj, sym_obj_nelts);
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if(ret.obj != NULL)
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return ret.obj;
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/*
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* If the implementation puts constants into the text segment, this
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* is where to find them!
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*/
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ret = sym_lookup(name, sym_func, sym_func_nelts);
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return ret.obj;
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}
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/* Lookup a pointer to an ANSI C function. */
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sym_func_t
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sym_function(const char *name)
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{
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return sym_lookup(name, sym_func, sym_func_nelts).func;
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}
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