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/*
* Copyright (c) 2018 Agustina Arzille.
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stddef.h>
#include <stdint.h>
#include <kern/macros.h>
#include <kern/symbol.h>
/*
* XXX Clang doesn't consider that weak symbols may change at link time
* by default, which turns the lookup into a no-op when optimizations
* are enabled. Make these variables volatile to work around this issue.
*/
const volatile size_t symbol_table_size __weak;
const struct symbol * volatile symbol_table_ptr __weak;
const struct symbol *
symbol_lookup(uintptr_t addr)
{
const struct symbol *table, *symbol;
uintptr_t start, end;
size_t size;
table = symbol_table_ptr;
size = symbol_table_size;
for (size_t i = 0; i < size; i++) {
symbol = &table[i];
if (!symbol->name || (symbol->size == 0)) {
continue;
}
start = symbol->addr;
end = symbol->addr + symbol->size;
if ((addr >= start) && (addr < end)) {
return symbol;
}
}
return NULL;
}
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