qemu/contrib/elf2dmp/pdb.c

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/*
* Copyright (c) 2018 Virtuozzo International GmbH
*
* Based on source of Wine project
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "qemu/osdep.h"
#include "pdb.h"
#include "err.h"
static uint32_t pdb_get_file_size(const struct pdb_reader *r, unsigned idx)
{
return r->ds.toc->file_size[idx];
}
static pdb_seg *get_seg_by_num(struct pdb_reader *r, size_t n)
{
size_t i = 0;
char *ptr;
for (ptr = r->segs; (ptr < r->segs + r->segs_size); ) {
i++;
ptr += 8;
if (i == n) {
break;
}
ptr += sizeof(pdb_seg);
}
return (pdb_seg *)ptr;
}
uint64_t pdb_find_public_v3_symbol(struct pdb_reader *r, const char *name)
{
size_t size = pdb_get_file_size(r, r->symbols->gsym_file);
int length;
const union codeview_symbol *sym;
const uint8_t *root = r->modimage;
size_t i;
for (i = 0; i < size; i += length) {
sym = (const void *)(root + i);
length = sym->generic.len + 2;
if (!sym->generic.id || length < 4) {
break;
}
if (sym->generic.id == S_PUB_V3 &&
!strcmp(name, sym->public_v3.name)) {
pdb_seg *segment = get_seg_by_num(r, sym->public_v3.segment);
uint32_t sect_rva = segment->dword[1];
uint64_t rva = sect_rva + sym->public_v3.offset;
printf("%s: 0x%016x(%d:\'%.8s\') + 0x%08x = 0x%09"PRIx64"\n", name,
sect_rva, sym->public_v3.segment,
((char *)segment - 8), sym->public_v3.offset, rva);
return rva;
}
}
return 0;
}
uint64_t pdb_resolve(uint64_t img_base, struct pdb_reader *r, const char *name)
{
uint64_t rva = pdb_find_public_v3_symbol(r, name);
if (!rva) {
return 0;
}
return img_base + rva;
}
static void pdb_reader_ds_exit(struct pdb_reader *r)
{
free(r->ds.toc);
}
static void pdb_exit_symbols(struct pdb_reader *r)
{
free(r->modimage);
free(r->symbols);
}
static void pdb_exit_segments(struct pdb_reader *r)
{
free(r->segs);
}
static void *pdb_ds_read(const PDB_DS_HEADER *header,
const uint32_t *block_list, int size)
{
int i, nBlocks;
uint8_t *buffer;
if (!size) {
return NULL;
}
nBlocks = (size + header->block_size - 1) / header->block_size;
buffer = malloc(nBlocks * header->block_size);
if (!buffer) {
return NULL;
}
for (i = 0; i < nBlocks; i++) {
memcpy(buffer + i * header->block_size, (const char *)header +
block_list[i] * header->block_size, header->block_size);
}
return buffer;
}
static void *pdb_ds_read_file(struct pdb_reader* r, uint32_t file_number)
{
const uint32_t *block_list;
uint32_t block_size;
const uint32_t *file_size;
size_t i;
if (!r->ds.toc || file_number >= r->ds.toc->num_files) {
return NULL;
}
file_size = r->ds.toc->file_size;
r->file_used[file_number / 32] |= 1 << (file_number % 32);
if (file_size[file_number] == 0 || file_size[file_number] == 0xFFFFFFFF) {
return NULL;
}
block_list = file_size + r->ds.toc->num_files;
block_size = r->ds.header->block_size;
for (i = 0; i < file_number; i++) {
block_list += (file_size[i] + block_size - 1) / block_size;
}
return pdb_ds_read(r->ds.header, block_list, file_size[file_number]);
}
static int pdb_init_segments(struct pdb_reader *r)
{
char *segs;
unsigned stream_idx = r->sidx.segments;
segs = pdb_ds_read_file(r, stream_idx);
if (!segs) {
return 1;
}
r->segs = segs;
r->segs_size = pdb_get_file_size(r, stream_idx);
return 0;
}
static int pdb_init_symbols(struct pdb_reader *r)
{
int err = 0;
PDB_SYMBOLS *symbols;
PDB_STREAM_INDEXES *sidx = &r->sidx;
memset(sidx, -1, sizeof(*sidx));
symbols = pdb_ds_read_file(r, 3);
if (!symbols) {
return 1;
}
r->symbols = symbols;
if (symbols->stream_index_size != sizeof(PDB_STREAM_INDEXES)) {
err = 1;
goto out_symbols;
}
memcpy(sidx, (const char *)symbols + sizeof(PDB_SYMBOLS) +
symbols->module_size + symbols->offset_size +
symbols->hash_size + symbols->srcmodule_size +
symbols->pdbimport_size + symbols->unknown2_size, sizeof(*sidx));
/* Read global symbol table */
r->modimage = pdb_ds_read_file(r, symbols->gsym_file);
if (!r->modimage) {
err = 1;
goto out_symbols;
}
return 0;
out_symbols:
free(symbols);
return err;
}
static int pdb_reader_ds_init(struct pdb_reader *r, PDB_DS_HEADER *hdr)
{
memset(r->file_used, 0, sizeof(r->file_used));
r->ds.header = hdr;
r->ds.toc = pdb_ds_read(hdr, (uint32_t *)((uint8_t *)hdr +
hdr->toc_page * hdr->block_size), hdr->toc_size);
if (!r->ds.toc) {
return 1;
}
return 0;
}
static int pdb_reader_init(struct pdb_reader *r, void *data)
{
int err = 0;
const char pdb7[] = "Microsoft C/C++ MSF 7.00";
if (memcmp(data, pdb7, sizeof(pdb7) - 1)) {
return 1;
}
if (pdb_reader_ds_init(r, data)) {
return 1;
}
r->ds.root = pdb_ds_read_file(r, 1);
if (!r->ds.root) {
err = 1;
goto out_ds;
}
if (pdb_init_symbols(r)) {
err = 1;
goto out_root;
}
if (pdb_init_segments(r)) {
err = 1;
goto out_sym;
}
return 0;
out_sym:
pdb_exit_symbols(r);
out_root:
free(r->ds.root);
out_ds:
pdb_reader_ds_exit(r);
return err;
}
static void pdb_reader_exit(struct pdb_reader *r)
{
pdb_exit_segments(r);
pdb_exit_symbols(r);
free(r->ds.root);
pdb_reader_ds_exit(r);
}
int pdb_init_from_file(const char *name, struct pdb_reader *reader)
{
GError *gerr = NULL;
int err = 0;
void *map;
reader->gmf = g_mapped_file_new(name, TRUE, &gerr);
if (gerr) {
eprintf("Failed to map PDB file \'%s\'\n", name);
return 1;
}
reader->file_size = g_mapped_file_get_length(reader->gmf);
map = g_mapped_file_get_contents(reader->gmf);
if (pdb_reader_init(reader, map)) {
err = 1;
goto out_unmap;
}
return 0;
out_unmap:
g_mapped_file_unref(reader->gmf);
return err;
}
void pdb_exit(struct pdb_reader *reader)
{
g_mapped_file_unref(reader->gmf);
pdb_reader_exit(reader);
}