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Fix a race condition in x64 code cache involving RtlGrowFunctionTable

This commit is contained in:
Dr. Chat 2016-07-19 13:59:40 -05:00
parent 18ff97e6b6
commit 2d55b12cc9
1 changed files with 27 additions and 21 deletions
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48
src/xenia/cpu/backend/x64/x64_code_cache.cc
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@ -90,7 +90,9 @@ void X64CodeCache::set_indirection_default(uint32_t default_value) {
void X64CodeCache::AddIndirection(uint32_t guest_address,
uint32_t host_address) {
assert_not_null(indirection_table_base_);
if (!indirection_table_base_) {
return;
}
uint32_t* indirection_slot = reinterpret_cast<uint32_t*>(
indirection_table_base_ + (guest_address - kIndirectionTableBase));
@ -158,28 +160,32 @@ void* X64CodeCache::PlaceGuestCode(uint32_t guest_address, void* machine_code,
(uint64_t(code_address - generated_code_base_) << 32) |
generated_code_offset_,
function_info);
// TODO(DrChat): The following code doesn't really need to be under the
// global lock except for PlaceCode (but it depends on the previous code
// already being ran)
// If we are going above the high water mark of committed memory, commit
// some more. It's ok if multiple threads do this, as redundant commits
// aren't harmful.
size_t old_commit_mark = generated_code_commit_mark_;
if (high_mark > old_commit_mark) {
size_t new_commit_mark = old_commit_mark + 16 * 1024 * 1024;
xe::memory::AllocFixed(generated_code_base_, new_commit_mark,
xe::memory::AllocationType::kCommit,
xe::memory::PageAccess::kExecuteReadWrite);
generated_code_commit_mark_.compare_exchange_strong(old_commit_mark,
new_commit_mark);
}
// Copy code.
std::memcpy(code_address, machine_code, code_size);
// Notify subclasses of placed code.
PlaceCode(guest_address, machine_code, code_size, stack_size, code_address,
unwind_reservation);
}
// If we are going above the high water mark of committed memory, commit some
// more. It's ok if multiple threads do this, as redundant commits aren't
// harmful.
size_t old_commit_mark = generated_code_commit_mark_;
if (high_mark > old_commit_mark) {
size_t new_commit_mark = old_commit_mark + 16 * 1024 * 1024;
xe::memory::AllocFixed(generated_code_base_, new_commit_mark,
xe::memory::AllocationType::kCommit,
xe::memory::PageAccess::kExecuteReadWrite);
generated_code_commit_mark_.compare_exchange_strong(old_commit_mark,
new_commit_mark);
}
// Copy code.
std::memcpy(code_address, machine_code, code_size);
// Notify subclasses of placed code.
PlaceCode(guest_address, machine_code, code_size, stack_size, code_address,
unwind_reservation);
// Now that everything is ready, fix up the indirection table.
// Note that we do support code that doesn't have an indirection fixup, so
// ignore those when we see them.