Pavel Dovgalyuk | c92079f | 2015-09-17 19:23:43 +0300 | [diff] [blame] | 1 | /* |
| 2 | * replay-internal.c |
| 3 | * |
| 4 | * Copyright (c) 2010-2015 Institute for System Programming |
| 5 | * of the Russian Academy of Sciences. |
| 6 | * |
| 7 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 8 | * See the COPYING file in the top-level directory. |
| 9 | * |
| 10 | */ |
| 11 | |
Peter Maydell | d38ea87 | 2016-01-29 17:50:05 +0000 | [diff] [blame] | 12 | #include "qemu/osdep.h" |
Pavel Dovgalyuk | c92079f | 2015-09-17 19:23:43 +0300 | [diff] [blame] | 13 | #include "qemu-common.h" |
Pavel Dovgalyuk | 26bc60a | 2015-09-17 19:23:54 +0300 | [diff] [blame] | 14 | #include "sysemu/replay.h" |
Pavel Dovgalyuk | c92079f | 2015-09-17 19:23:43 +0300 | [diff] [blame] | 15 | #include "replay-internal.h" |
| 16 | #include "qemu/error-report.h" |
| 17 | #include "sysemu/sysemu.h" |
| 18 | |
Pavel Dovgalyuk | c16861e | 2015-09-17 19:23:48 +0300 | [diff] [blame] | 19 | /* Mutex to protect reading and writing events to the log. |
Pavel Dovgalyuk | f186d64 | 2016-09-26 11:08:04 +0300 | [diff] [blame] | 20 | data_kind and has_unread_data are also protected |
Pavel Dovgalyuk | c16861e | 2015-09-17 19:23:48 +0300 | [diff] [blame] | 21 | by this mutex. |
| 22 | It also protects replay events queue which stores events to be |
| 23 | written or read to the log. */ |
| 24 | static QemuMutex lock; |
| 25 | |
Pavel Dovgalyuk | c92079f | 2015-09-17 19:23:43 +0300 | [diff] [blame] | 26 | /* File for replay writing */ |
| 27 | FILE *replay_file; |
| 28 | |
| 29 | void replay_put_byte(uint8_t byte) |
| 30 | { |
| 31 | if (replay_file) { |
| 32 | putc(byte, replay_file); |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | void replay_put_event(uint8_t event) |
| 37 | { |
Pavel Dovgalyuk | 26bc60a | 2015-09-17 19:23:54 +0300 | [diff] [blame] | 38 | assert(event < EVENT_COUNT); |
Pavel Dovgalyuk | c92079f | 2015-09-17 19:23:43 +0300 | [diff] [blame] | 39 | replay_put_byte(event); |
| 40 | } |
| 41 | |
| 42 | |
| 43 | void replay_put_word(uint16_t word) |
| 44 | { |
| 45 | replay_put_byte(word >> 8); |
| 46 | replay_put_byte(word); |
| 47 | } |
| 48 | |
| 49 | void replay_put_dword(uint32_t dword) |
| 50 | { |
| 51 | replay_put_word(dword >> 16); |
| 52 | replay_put_word(dword); |
| 53 | } |
| 54 | |
| 55 | void replay_put_qword(int64_t qword) |
| 56 | { |
| 57 | replay_put_dword(qword >> 32); |
| 58 | replay_put_dword(qword); |
| 59 | } |
| 60 | |
| 61 | void replay_put_array(const uint8_t *buf, size_t size) |
| 62 | { |
| 63 | if (replay_file) { |
| 64 | replay_put_dword(size); |
| 65 | fwrite(buf, 1, size, replay_file); |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | uint8_t replay_get_byte(void) |
| 70 | { |
| 71 | uint8_t byte = 0; |
| 72 | if (replay_file) { |
| 73 | byte = getc(replay_file); |
| 74 | } |
| 75 | return byte; |
| 76 | } |
| 77 | |
| 78 | uint16_t replay_get_word(void) |
| 79 | { |
| 80 | uint16_t word = 0; |
| 81 | if (replay_file) { |
| 82 | word = replay_get_byte(); |
| 83 | word = (word << 8) + replay_get_byte(); |
| 84 | } |
| 85 | |
| 86 | return word; |
| 87 | } |
| 88 | |
| 89 | uint32_t replay_get_dword(void) |
| 90 | { |
| 91 | uint32_t dword = 0; |
| 92 | if (replay_file) { |
| 93 | dword = replay_get_word(); |
| 94 | dword = (dword << 16) + replay_get_word(); |
| 95 | } |
| 96 | |
| 97 | return dword; |
| 98 | } |
| 99 | |
| 100 | int64_t replay_get_qword(void) |
| 101 | { |
| 102 | int64_t qword = 0; |
| 103 | if (replay_file) { |
| 104 | qword = replay_get_dword(); |
| 105 | qword = (qword << 32) + replay_get_dword(); |
| 106 | } |
| 107 | |
| 108 | return qword; |
| 109 | } |
| 110 | |
| 111 | void replay_get_array(uint8_t *buf, size_t *size) |
| 112 | { |
| 113 | if (replay_file) { |
| 114 | *size = replay_get_dword(); |
| 115 | if (fread(buf, 1, *size, replay_file) != *size) { |
| 116 | error_report("replay read error"); |
| 117 | } |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | void replay_get_array_alloc(uint8_t **buf, size_t *size) |
| 122 | { |
| 123 | if (replay_file) { |
| 124 | *size = replay_get_dword(); |
| 125 | *buf = g_malloc(*size); |
| 126 | if (fread(*buf, 1, *size, replay_file) != *size) { |
| 127 | error_report("replay read error"); |
| 128 | } |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | void replay_check_error(void) |
| 133 | { |
| 134 | if (replay_file) { |
| 135 | if (feof(replay_file)) { |
| 136 | error_report("replay file is over"); |
| 137 | qemu_system_vmstop_request_prepare(); |
| 138 | qemu_system_vmstop_request(RUN_STATE_PAUSED); |
| 139 | } else if (ferror(replay_file)) { |
| 140 | error_report("replay file is over or something goes wrong"); |
| 141 | qemu_system_vmstop_request_prepare(); |
| 142 | qemu_system_vmstop_request(RUN_STATE_INTERNAL_ERROR); |
| 143 | } |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | void replay_fetch_data_kind(void) |
| 148 | { |
| 149 | if (replay_file) { |
Pavel Dovgalyuk | f186d64 | 2016-09-26 11:08:04 +0300 | [diff] [blame] | 150 | if (!replay_state.has_unread_data) { |
| 151 | replay_state.data_kind = replay_get_byte(); |
| 152 | if (replay_state.data_kind == EVENT_INSTRUCTION) { |
Pavel Dovgalyuk | 26bc60a | 2015-09-17 19:23:54 +0300 | [diff] [blame] | 153 | replay_state.instructions_count = replay_get_dword(); |
| 154 | } |
Pavel Dovgalyuk | c92079f | 2015-09-17 19:23:43 +0300 | [diff] [blame] | 155 | replay_check_error(); |
Pavel Dovgalyuk | f186d64 | 2016-09-26 11:08:04 +0300 | [diff] [blame] | 156 | replay_state.has_unread_data = 1; |
| 157 | if (replay_state.data_kind >= EVENT_COUNT) { |
| 158 | error_report("Replay: unknown event kind %d", |
| 159 | replay_state.data_kind); |
Pavel Dovgalyuk | 26bc60a | 2015-09-17 19:23:54 +0300 | [diff] [blame] | 160 | exit(1); |
| 161 | } |
Pavel Dovgalyuk | c92079f | 2015-09-17 19:23:43 +0300 | [diff] [blame] | 162 | } |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | void replay_finish_event(void) |
| 167 | { |
Pavel Dovgalyuk | f186d64 | 2016-09-26 11:08:04 +0300 | [diff] [blame] | 168 | replay_state.has_unread_data = 0; |
Pavel Dovgalyuk | c92079f | 2015-09-17 19:23:43 +0300 | [diff] [blame] | 169 | replay_fetch_data_kind(); |
| 170 | } |
Pavel Dovgalyuk | c16861e | 2015-09-17 19:23:48 +0300 | [diff] [blame] | 171 | |
| 172 | void replay_mutex_init(void) |
| 173 | { |
| 174 | qemu_mutex_init(&lock); |
| 175 | } |
| 176 | |
| 177 | void replay_mutex_destroy(void) |
| 178 | { |
| 179 | qemu_mutex_destroy(&lock); |
| 180 | } |
| 181 | |
| 182 | void replay_mutex_lock(void) |
| 183 | { |
| 184 | qemu_mutex_lock(&lock); |
| 185 | } |
| 186 | |
| 187 | void replay_mutex_unlock(void) |
| 188 | { |
| 189 | qemu_mutex_unlock(&lock); |
| 190 | } |
Pavel Dovgalyuk | 26bc60a | 2015-09-17 19:23:54 +0300 | [diff] [blame] | 191 | |
| 192 | /*! Saves cached instructions. */ |
| 193 | void replay_save_instructions(void) |
| 194 | { |
| 195 | if (replay_file && replay_mode == REPLAY_MODE_RECORD) { |
| 196 | replay_mutex_lock(); |
| 197 | int diff = (int)(replay_get_current_step() - replay_state.current_step); |
Alex Bennée | 982263c | 2017-04-05 11:05:28 +0100 | [diff] [blame] | 198 | |
| 199 | /* Time can only go forward */ |
| 200 | assert(diff >= 0); |
| 201 | |
Pavel Dovgalyuk | 26bc60a | 2015-09-17 19:23:54 +0300 | [diff] [blame] | 202 | if (diff > 0) { |
| 203 | replay_put_event(EVENT_INSTRUCTION); |
| 204 | replay_put_dword(diff); |
| 205 | replay_state.current_step += diff; |
| 206 | } |
| 207 | replay_mutex_unlock(); |
| 208 | } |
| 209 | } |