mirror of
https://github.com/RGBCube/serenity
synced 2025-05-26 01:35:08 +00:00
ec6bceaa08
This patch adds support for TLS according to the x86 System V ABI. Each thread gets a thread-specific memory region, and the GS segment register always points _to a pointer_ to the thread-specific memory. In other words, to access thread-local variables, userspace programs start by dereferencing the pointer at [gs:0]. The Process keeps a master copy of the TLS segment that new threads should use, and when a new thread is created, they get a copy of it. It's basically whatever the PT_TLS program header in the ELF says.
61 lines
1.4 KiB
C++
61 lines
1.4 KiB
C++
#pragma once
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#include <AK/Function.h>
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#include <AK/HashMap.h>
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#include <AK/OwnPtr.h>
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#include <AK/Vector.h>
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#include <AK/ELF/ELFImage.h>
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#ifdef KERNEL
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#include <Kernel/VM/VirtualAddress.h>
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class Region;
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#endif
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class ELFLoader {
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public:
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explicit ELFLoader(const u8*);
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~ELFLoader();
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bool load();
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#if defined(KERNEL)
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Function<void*(VirtualAddress, size_t, size_t, bool, bool, const String&)> alloc_section_hook;
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Function<void*(size_t, size_t)> tls_section_hook;
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Function<void*(VirtualAddress, size_t, size_t, size_t, bool r, bool w, bool x, const String&)> map_section_hook;
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VirtualAddress entry() const { return m_image.entry(); }
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#endif
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char* symbol_ptr(const char* name);
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bool has_symbols() const { return m_image.symbol_count(); }
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String symbolicate(u32 address) const;
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private:
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bool layout();
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bool perform_relocations();
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void* lookup(const ELFImage::Symbol&);
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char* area_for_section(const ELFImage::Section&);
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char* area_for_section_name(const char*);
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struct PtrAndSize {
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PtrAndSize() {}
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PtrAndSize(char* p, unsigned s)
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: ptr(p)
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, size(s)
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{
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}
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char* ptr { nullptr };
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unsigned size { 0 };
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};
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ELFImage m_image;
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struct SortedSymbol {
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u32 address;
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const char* name;
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};
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#ifdef KERNEL
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mutable RefPtr<Region> m_sorted_symbols_region;
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#else
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mutable Vector<SortedSymbol> m_sorted_symbols;
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#endif
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};
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