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UserspaceEmulator: Add basic TLS (thread-local storage) support
The SoftMMU now receives full X86::LogicalAddress values from SoftCPU. This allows the MMU to reroute TLS accesses to a special memory region. The ELF executable's PT_TLS header tells us how to allocate the TLS. Basically, the GS register points to a magical 4-byte area which has a pointer to the TCB (thread control block). The TCB lives in normal flat memory space and is accessed through the DS register.
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4 changed files with 77 additions and 50 deletions
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@ -27,7 +27,9 @@
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#pragma once
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#include <AK/NonnullOwnPtrVector.h>
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#include <AK/OwnPtr.h>
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#include <AK/Types.h>
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#include <LibX86/Instruction.h>
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namespace UserspaceEmulator {
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@ -63,18 +65,21 @@ public:
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u32 m_size { 0 };
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};
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u8 read8(u32 address);
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u16 read16(u32 address);
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u32 read32(u32 address);
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u8 read8(X86::LogicalAddress);
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u16 read16(X86::LogicalAddress);
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u32 read32(X86::LogicalAddress);
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void write8(u32 address, u8 value);
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void write16(u32 address, u16 value);
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void write32(u32 address, u32 value);
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void write8(X86::LogicalAddress, u8);
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void write16(X86::LogicalAddress, u16);
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void write32(X86::LogicalAddress, u32);
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Region* find_region(X86::LogicalAddress);
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Region* find_region(u32 address);
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void add_region(NonnullOwnPtr<Region>);
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void set_tls_region(NonnullOwnPtr<Region>);
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private:
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OwnPtr<Region> m_tls_region;
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NonnullOwnPtrVector<Region> m_regions;
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};
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