diff options
Diffstat (limited to 'replay/replay-internal.c')
| -rw-r--r-- | replay/replay-internal.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/replay/replay-internal.c b/replay/replay-internal.c new file mode 100644 index 0000000000..35cff44a36 --- /dev/null +++ b/replay/replay-internal.c @@ -0,0 +1,206 @@ +/* + * replay-internal.c + * + * Copyright (c) 2010-2015 Institute for System Programming + * of the Russian Academy of Sciences. + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + * + */ + +#include "qemu-common.h" +#include "sysemu/replay.h" +#include "replay-internal.h" +#include "qemu/error-report.h" +#include "sysemu/sysemu.h" + +unsigned int replay_data_kind = -1; +static unsigned int replay_has_unread_data; + +/* Mutex to protect reading and writing events to the log. + replay_data_kind and replay_has_unread_data are also protected + by this mutex. + It also protects replay events queue which stores events to be + written or read to the log. */ +static QemuMutex lock; + +/* File for replay writing */ +FILE *replay_file; + +void replay_put_byte(uint8_t byte) +{ + if (replay_file) { + putc(byte, replay_file); + } +} + +void replay_put_event(uint8_t event) +{ + assert(event < EVENT_COUNT); + replay_put_byte(event); +} + + +void replay_put_word(uint16_t word) +{ + replay_put_byte(word >> 8); + replay_put_byte(word); +} + +void replay_put_dword(uint32_t dword) +{ + replay_put_word(dword >> 16); + replay_put_word(dword); +} + +void replay_put_qword(int64_t qword) +{ + replay_put_dword(qword >> 32); + replay_put_dword(qword); +} + +void replay_put_array(const uint8_t *buf, size_t size) +{ + if (replay_file) { + replay_put_dword(size); + fwrite(buf, 1, size, replay_file); + } +} + +uint8_t replay_get_byte(void) +{ + uint8_t byte = 0; + if (replay_file) { + byte = getc(replay_file); + } + return byte; +} + +uint16_t replay_get_word(void) +{ + uint16_t word = 0; + if (replay_file) { + word = replay_get_byte(); + word = (word << 8) + replay_get_byte(); + } + + return word; +} + +uint32_t replay_get_dword(void) +{ + uint32_t dword = 0; + if (replay_file) { + dword = replay_get_word(); + dword = (dword << 16) + replay_get_word(); + } + + return dword; +} + +int64_t replay_get_qword(void) +{ + int64_t qword = 0; + if (replay_file) { + qword = replay_get_dword(); + qword = (qword << 32) + replay_get_dword(); + } + + return qword; +} + +void replay_get_array(uint8_t *buf, size_t *size) +{ + if (replay_file) { + *size = replay_get_dword(); + if (fread(buf, 1, *size, replay_file) != *size) { + error_report("replay read error"); + } + } +} + +void replay_get_array_alloc(uint8_t **buf, size_t *size) +{ + if (replay_file) { + *size = replay_get_dword(); + *buf = g_malloc(*size); + if (fread(*buf, 1, *size, replay_file) != *size) { + error_report("replay read error"); + } + } +} + +void replay_check_error(void) +{ + if (replay_file) { + if (feof(replay_file)) { + error_report("replay file is over"); + qemu_system_vmstop_request_prepare(); + qemu_system_vmstop_request(RUN_STATE_PAUSED); + } else if (ferror(replay_file)) { + error_report("replay file is over or something goes wrong"); + qemu_system_vmstop_request_prepare(); + qemu_system_vmstop_request(RUN_STATE_INTERNAL_ERROR); + } + } +} + +void replay_fetch_data_kind(void) +{ + if (replay_file) { + if (!replay_has_unread_data) { + replay_data_kind = replay_get_byte(); + if (replay_data_kind == EVENT_INSTRUCTION) { + replay_state.instructions_count = replay_get_dword(); + } + replay_check_error(); + replay_has_unread_data = 1; + if (replay_data_kind >= EVENT_COUNT) { + error_report("Replay: unknown event kind %d", replay_data_kind); + exit(1); + } + } + } +} + +void replay_finish_event(void) +{ + replay_has_unread_data = 0; + replay_fetch_data_kind(); +} + +void replay_mutex_init(void) +{ + qemu_mutex_init(&lock); +} + +void replay_mutex_destroy(void) +{ + qemu_mutex_destroy(&lock); +} + +void replay_mutex_lock(void) +{ + qemu_mutex_lock(&lock); +} + +void replay_mutex_unlock(void) +{ + qemu_mutex_unlock(&lock); +} + +/*! Saves cached instructions. */ +void replay_save_instructions(void) +{ + if (replay_file && replay_mode == REPLAY_MODE_RECORD) { + replay_mutex_lock(); + int diff = (int)(replay_get_current_step() - replay_state.current_step); + if (diff > 0) { + replay_put_event(EVENT_INSTRUCTION); + replay_put_dword(diff); + replay_state.current_step += diff; + } + replay_mutex_unlock(); + } +} |