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48 lines
1.7 KiB
C++
48 lines
1.7 KiB
C++
#ifndef __TRACYTAGGEDPTR_HPP__
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#define __TRACYTAGGEDPTR_HPP__
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#include <stdint.h>
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#include <assert.h>
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namespace tracy
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{
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class TaggedUserlandAddress
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{
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uint64_t m_storage;
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// So far no kernel seems to allow userspace address with more than 56bits userspace VAs since now hardware support it. See https://docs.kernel.org/next/x86/x86_64/mm.html and https://www.kernel.org/doc/html/v5.8/arm64/memory.html#bit-userspace-vas
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static constexpr uint64_t kUserspaceVABits = 56;
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static constexpr uint64_t kKernelOnlyBits = 64 - kUserspaceVABits;
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static constexpr uint64_t kKernelOnlyBitMask = ( ( uint64_t(1) << kKernelOnlyBits ) - uint64_t(1) ) << kUserspaceVABits;
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public:
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TaggedUserlandAddress() = default;
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explicit TaggedUserlandAddress( uint64_t address, uint8_t tag = 0 )
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{
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assert( ( address & kKernelOnlyBitMask ) == 0 );
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assert( ( (uint64_t)tag & ~( kKernelOnlyBitMask >> kUserspaceVABits ) ) == 0 );
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m_storage = address | ( (uint64_t)tag << kUserspaceVABits );
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}
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void SetPackedValue(uint64_t value) { m_storage = value; }
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uint64_t GetPackedValue() const { return m_storage; }
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void SetAddress( uint64_t address)
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{
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assert( ( address & kKernelOnlyBitMask ) == 0 );
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m_storage = ( m_storage & kKernelOnlyBitMask ) | address;
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}
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uint64_t GetAddress() const { return m_storage & ( ~kKernelOnlyBitMask ); }
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void SetTag( uint8_t tag )
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{
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assert( ( (uint64_t)tag & ~( kKernelOnlyBitMask >> kUserspaceVABits ) ) == 0 );
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m_storage = ( (uint64_t)tag << kUserspaceVABits ) | ( m_storage & ( ~kKernelOnlyBitMask ) );
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}
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uint8_t GetTag() const { return (uint8_t)( ( m_storage & kKernelOnlyBitMask ) >> kUserspaceVABits ); }
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};
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}
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#endif
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