63 lines
3.3 KiB
C
63 lines
3.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/alg/alg.h"
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#include "libc/calls/calls.h"
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#include "libc/elf/def.h"
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#include "libc/elf/elf.h"
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#include "libc/runtime/carsort.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/symbols.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/prot.h"
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/**
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* Maps debuggable binary into memory and indexes symbol addresses.
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*
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* @return object freeable with closesymboltable(), or NULL w/ errno
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*/
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struct SymbolTable *opensymboltable(const char *filename) {
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unsigned i, j;
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struct SymbolTable *t;
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const Elf64_Sym *symtab, *sym;
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t = MAP_FAILED;
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if (filename && (t = mapanon(BIGPAGESIZE)) != MAP_FAILED &&
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mapelfread(filename, &t->mf) &&
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(t->name_base = getelfstringtable(t->elf, t->elfsize)) != NULL &&
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(symtab = getelfsymboltable(t->elf, t->elfsize, &t->count)) &&
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sizeof(struct SymbolTable) + sizeof(struct Symbol) * t->count <
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(t->scratch = BIGPAGESIZE)) {
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getelfvirtualaddressrange(t->elf, t->elfsize, &t->addr_base, &t->addr_end);
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for (j = i = 0; i < t->count; ++i) {
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sym = &symtab[i];
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if (iselfsymbolcontent(sym) &&
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(sym->st_value >= t->addr_base && sym->st_value <= t->addr_end)) {
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t->symbols[j].addr_rva = (unsigned)(sym->st_value - t->addr_base);
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t->symbols[j].name_rva = sym->st_name;
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j++;
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}
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}
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t->count = j;
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carsort1000(t->count, (void *)t->symbols);
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} else {
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closesymboltable(&t);
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}
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return t == MAP_FAILED ? NULL : t;
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}
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