* memory snapshots fix use after free on flatview copy
When restoring a snapshot with memory the flatview must be restored
before the memory reagions are filtered. Because the
AddressSpaceDispatcher also has pointer to the MemoryRegions and on copy
they need to be cleared. The memory_filter_subregions function frees
MemoryRegions which are not used at the time of the snapshot.
* fix some memleaks in tests
These tests has forgott to call uc_close(uc), which lead to memory
leaks. Found by the LeakSanitizer.
* memory snapshots correct clean up container memory regions
* Fix further stackoverflow in tests
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Co-authored-by: mio <mio@lazym.io>
* Remove global variable from aarch64 tcg target
This obviously breaks trying to run two unicorn instances at once on
aarch64. It appears a similar variable had already been moved to the
state struct for i386 tcg target.
* Reenable writing to jit region while calling tb_add_jump
On arm macs, every place that writes to jit code needs to have
tb_exec_unlock called first. This is already in most necessary places,
but not this one.
* Don't forget to call restore_jit_state in uc_context_restore
Every time UC_INIT is used, restore_jit_state must be used on the return
path, or occasional assertion failures will pop up on arm macs.
* Restore pc before calling into tlb fill hook
In my application it is important to have correct pc values available
from this hook.
* enable notdirty_write for snapshots when possible
Snapshots only happens when the priority of the memory region is smaller
then the snapshot_level. After a snapshot notdirty can be set.
* disable notdirty_write for self modifying code
When SMC access the memory region more then once the
tb must be rebuild multible times.
fixes#2029
* notdirty_write better hook check
Check all relevant memory hooks before enabling notdirty write.
This also checks if the memory hook is registered for the affected
region. So it is possible to use notdirty write and have some hooks
on different addresses.
* notdirty_write check for addr_write in snapshot case
* self modifying code clear recursive mem access
when self modifying code does unaligned memory accese sometimes
uc->size_recur_mem is changed but for notdirty write not changed back.
This causes mem_hooks to be missed. To fix this uc->size_recur_mem is
set to 0 before each cpu_exec() call.
* optimize ram block handling
Save the last element of the ram_list. This allows to
faster find where to add new elements when they are not
bigger then page size.
* save ram_list freed
this keeps the optimization for find_ram_offset() intact after snapshot
restore.
* cow only clear the tlb of affected pages
* update flatview when possible
Building each flatview new when the memory has changed is quite
expensive when many MemoryRegions are used. This is an issue when using
snapshots.
* update benchmark for new api
* save flatview in context
this avoids rebuilding the flatview when restore a context.
* init context flatview with zero
* address_space_dispatch_clear remove subpage with higher priority
* docutemnt the options for UC_CTL_CONTEXT_MODE
Specialy stress that with UC_CTL_CONTEXT_MEMORY it is not possible to
use the context with a different unicorn object.
Uses Copy on Write to make it posible to restore the memory state after a snapshot
was made. To restore all MemoryRegions created after the snapshot are removed.
quit_request is for internal use. This means the IP register was updated and
qemu needs to rebuild the translation blocks.
stop_request is set by the user (uc_emu_stop) to indecate that unicorn sould
stop emulating.
