44 lines
2.7 KiB
C
44 lines
2.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ 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; version 2 of the License. │
|
|
│ │
|
|
│ 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, write to the Free Software │
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
|
│ 02110-1301 USA │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/alg/bisectcarleft.h"
|
|
#include "libc/assert.h"
|
|
#include "libc/runtime/symbols.h"
|
|
|
|
/**
|
|
* Finds symbol associated with address.
|
|
* @param symbol table pointer (null propagating)
|
|
* @return symbol address or NULL if not found
|
|
*/
|
|
const struct Symbol *bisectsymbol(struct SymbolTable *t,
|
|
intptr_t virtual_address,
|
|
int64_t *opt_out_addend) {
|
|
const struct Symbol *symbol = NULL;
|
|
int64_t addend = (intptr_t)virtual_address;
|
|
if (t && t->count) {
|
|
unsigned key = (unsigned)((intptr_t)virtual_address - t->addr_base - 1);
|
|
unsigned i = bisectcarleft((const int32_t(*)[2])t->symbols, t->count, key);
|
|
assert(0 <= i && i < t->count);
|
|
symbol = &t->symbols[i];
|
|
addend = (int64_t)key - (int64_t)symbol->addr_rva;
|
|
}
|
|
if (opt_out_addend) *opt_out_addend = addend;
|
|
return symbol;
|
|
}
|