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Kernel: Implement TLS support for x86_64

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Gunnar Beutner 2021-07-03 00:25:44 +02:00 committed by Andreas Kling
parent 04a912f68f
commit c51b49a8cb
Notes: sideshowbarker 2024-07-18 10:31:54 +09:00 
Author: https://github.com/gunnarbeutner
Commit: https://github.com/SerenityOS/serenity/commit/c51b49a8cb8
Pull-request: https://github.com/SerenityOS/serenity/pull/8414
2 changed files with 6 additions and 1 deletions
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3
Kernel/Arch/x86/common/Processor.cpp
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@ -1214,6 +1214,9 @@ extern "C" void enter_thread_context(Thread* from_thread, Thread* to_thread)
auto& tls_descriptor = processor.get_gdt_entry(GDT_SELECTOR_TLS);
tls_descriptor.set_base(to_thread->thread_specific_data());
tls_descriptor.set_limit(to_thread->thread_specific_region_size());
#else
MSR fs_base_msr(MSR_FS_BASE);
fs_base_msr.set(to_thread->thread_specific_data().get());
#endif
if (from_regs.cr3 != to_regs.cr3)

4
Kernel/Syscalls/mmap.cpp
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@ -6,6 +6,7 @@
*/
#include <Kernel/Arch/x86/InterruptDisabler.h>
#include <Kernel/Arch/x86/MSR.h>
#include <Kernel/Arch/x86/SmapDisabler.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/PerformanceEventBuffer.h>
@ -618,7 +619,8 @@ KResultOr<FlatPtr> Process::sys$allocate_tls(Userspace<const char*> initial_data
tls_descriptor.set_base(main_thread->thread_specific_data());
tls_descriptor.set_limit(main_thread->thread_specific_region_size());
#else
dbgln("FIXME: Not setting FS_BASE for process.");
MSR fs_base_msr(MSR_FS_BASE);
fs_base_msr.set(main_thread->thread_specific_data().get());
#endif
return m_master_tls_region.unsafe_ptr()->vaddr().get();