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

testdev.c (3658B)

      1/*
      2 * QEMU Char Device for testsuite control
      3 *
      4 * Copyright (c) 2014 Red Hat, Inc.
      5 *
      6 * Author: Paolo Bonzini <pbonzini@redhat.com>
      7 *
      8 * Permission is hereby granted, free of charge, to any person obtaining a copy
      9 * of this software and associated documentation files (the "Software"), to deal
     10 * in the Software without restriction, including without limitation the rights
     11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     12 * copies of the Software, and to permit persons to whom the Software is
     13 * furnished to do so, subject to the following conditions:
     14 *
     15 * The above copyright notice and this permission notice shall be included in
     16 * all copies or substantial portions of the Software.
     17 *
     18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
     21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     24 * THE SOFTWARE.
     25 */
     26
     27#include "qemu/osdep.h"
     28#include "qemu/module.h"
     29#include "chardev/char.h"
     30#include "qom/object.h"
     31
     32#define BUF_SIZE 32
     33
     34struct TestdevChardev {
     35    Chardev parent;
     36
     37    uint8_t in_buf[32];
     38    int in_buf_used;
     39};
     40typedef struct TestdevChardev TestdevChardev;
     41
     42#define TYPE_CHARDEV_TESTDEV "chardev-testdev"
     43DECLARE_INSTANCE_CHECKER(TestdevChardev, TESTDEV_CHARDEV,
     44                         TYPE_CHARDEV_TESTDEV)
     45
     46/* Try to interpret a whole incoming packet */
     47static int testdev_eat_packet(TestdevChardev *testdev)
     48{
     49    const uint8_t *cur = testdev->in_buf;
     50    int len = testdev->in_buf_used;
     51    uint8_t c;
     52    int arg;
     53
     54#define EAT(c) do { \
     55    if (!len--) {   \
     56        return 0;   \
     57    }               \
     58    c = *cur++;     \
     59} while (0)
     60
     61    EAT(c);
     62
     63    while (isspace(c)) {
     64        EAT(c);
     65    }
     66
     67    arg = 0;
     68    while (isdigit(c)) {
     69        arg = arg * 10 + c - '0';
     70        EAT(c);
     71    }
     72
     73    while (isspace(c)) {
     74        EAT(c);
     75    }
     76
     77    switch (c) {
     78    case 'q':
     79        exit((arg << 1) | 1);
     80        break;
     81    default:
     82        break;
     83    }
     84    return cur - testdev->in_buf;
     85}
     86
     87/* The other end is writing some data.  Store it and try to interpret */
     88static int testdev_chr_write(Chardev *chr, const uint8_t *buf, int len)
     89{
     90    TestdevChardev *testdev = TESTDEV_CHARDEV(chr);
     91    int tocopy, eaten, orig_len = len;
     92
     93    while (len) {
     94        /* Complete our buffer as much as possible */
     95        tocopy = MIN(len, BUF_SIZE - testdev->in_buf_used);
     96
     97        memcpy(testdev->in_buf + testdev->in_buf_used, buf, tocopy);
     98        testdev->in_buf_used += tocopy;
     99        buf += tocopy;
    100        len -= tocopy;
    101
    102        /* Interpret it as much as possible */
    103        while (testdev->in_buf_used > 0 &&
    104               (eaten = testdev_eat_packet(testdev)) > 0) {
    105            memmove(testdev->in_buf, testdev->in_buf + eaten,
    106                    testdev->in_buf_used - eaten);
    107            testdev->in_buf_used -= eaten;
    108        }
    109    }
    110    return orig_len;
    111}
    112
    113static void char_testdev_class_init(ObjectClass *oc, void *data)
    114{
    115    ChardevClass *cc = CHARDEV_CLASS(oc);
    116
    117    cc->chr_write = testdev_chr_write;
    118}
    119
    120static const TypeInfo char_testdev_type_info = {
    121    .name = TYPE_CHARDEV_TESTDEV,
    122    .parent = TYPE_CHARDEV,
    123    .instance_size = sizeof(TestdevChardev),
    124    .class_init = char_testdev_class_init,
    125};
    126
    127static void register_types(void)
    128{
    129    type_register_static(&char_testdev_type_info);
    130}
    131
    132type_init(register_types);