cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

datadir.c (3600B)

      1/*
      2 * QEMU firmware and keymap file search
      3 *
      4 * Copyright (c) 2003-2020 QEMU contributors
      5 *
      6 * Permission is hereby granted, free of charge, to any person obtaining a copy
      7 * of this software and associated documentation files (the "Software"), to deal
      8 * in the Software without restriction, including without limitation the rights
      9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     10 * copies of the Software, and to permit persons to whom the Software is
     11 * furnished to do so, subject to the following conditions:
     12 *
     13 * The above copyright notice and this permission notice shall be included in
     14 * all copies or substantial portions of the Software.
     15 *
     16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
     19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     22 * THE SOFTWARE.
     23 */
     24
     25#include "qemu/osdep.h"
     26#include "qemu-common.h"
     27#include "qemu/datadir.h"
     28#include "qemu/cutils.h"
     29#include "trace.h"
     30
     31static const char *data_dir[16];
     32static int data_dir_idx;
     33
     34char *qemu_find_file(int type, const char *name)
     35{
     36    int i;
     37    const char *subdir;
     38    char *buf;
     39
     40    /* Try the name as a straight path first */
     41    if (access(name, R_OK) == 0) {
     42        trace_load_file(name, name);
     43        return g_strdup(name);
     44    }
     45
     46    switch (type) {
     47    case QEMU_FILE_TYPE_BIOS:
     48        subdir = "";
     49        break;
     50    case QEMU_FILE_TYPE_KEYMAP:
     51        subdir = "keymaps/";
     52        break;
     53    default:
     54        abort();
     55    }
     56
     57    for (i = 0; i < data_dir_idx; i++) {
     58        buf = g_strdup_printf("%s/%s%s", data_dir[i], subdir, name);
     59        if (access(buf, R_OK) == 0) {
     60            trace_load_file(name, buf);
     61            return buf;
     62        }
     63        g_free(buf);
     64    }
     65    return NULL;
     66}
     67
     68void qemu_add_data_dir(char *path)
     69{
     70    int i;
     71
     72    if (path == NULL) {
     73        return;
     74    }
     75    if (data_dir_idx == ARRAY_SIZE(data_dir)) {
     76        return;
     77    }
     78    for (i = 0; i < data_dir_idx; i++) {
     79        if (strcmp(data_dir[i], path) == 0) {
     80            g_free(path); /* duplicate */
     81            return;
     82        }
     83    }
     84    data_dir[data_dir_idx++] = path;
     85}
     86
     87/*
     88 * Find a likely location for support files using the location of the binary.
     89 * When running from the build tree this will be "$bindir/pc-bios".
     90 * Otherwise, this is CONFIG_QEMU_DATADIR (possibly relocated).
     91 *
     92 * The caller must use g_free() to free the returned data when it is
     93 * no longer required.
     94 */
     95static char *find_datadir(void)
     96{
     97    g_autofree char *dir = NULL;
     98
     99    dir = g_build_filename(qemu_get_exec_dir(), "pc-bios", NULL);
    100    if (g_file_test(dir, G_FILE_TEST_IS_DIR)) {
    101        return g_steal_pointer(&dir);
    102    }
    103
    104    return get_relocated_path(CONFIG_QEMU_DATADIR);
    105}
    106
    107void qemu_add_default_firmwarepath(void)
    108{
    109    char **dirs;
    110    size_t i;
    111
    112    /* add configured firmware directories */
    113    dirs = g_strsplit(CONFIG_QEMU_FIRMWAREPATH, G_SEARCHPATH_SEPARATOR_S, 0);
    114    for (i = 0; dirs[i] != NULL; i++) {
    115        qemu_add_data_dir(get_relocated_path(dirs[i]));
    116    }
    117    g_strfreev(dirs);
    118
    119    /* try to find datadir relative to the executable path */
    120    qemu_add_data_dir(find_datadir());
    121}
    122
    123void qemu_list_data_dirs(void)
    124{
    125    int i;
    126    for (i = 0; i < data_dir_idx; i++) {
    127        printf("%s\n", data_dir[i]);
    128    }
    129}