Merge pull request #1686 from Sonicadvance1/add_relocation_definitions

ArchHelpers: Adds relocation struct defines

External/FEXCore/Source/Interface/Core/ObjectCache/Relocations.h

@@ -0,0 +1,78 @@
+#pragma once
+#include <FEXCore/IR/IR.h>
+
+namespace FEXCore::CPU {
+  enum class RelocationTypes : uint8_t {
+    // 8 byte literal in memory for symbol
+    // Aligned to struct RelocNamedSymbolLiteral
+    RELOC_NAMED_SYMBOL_LITERAL,
+
+    // Fixed size named thunk move
+    // 4 instruction constant generation on AArch64
+    // 64-bit mov on x86-64
+    // Aligned to struct RelocNamedThunkMove
+    RELOC_NAMED_THUNK_MOVE,
+
+    // Fixed size guest RIP move
+    // 4 instruction constant generation on AArch64
+    // 64-bit mov on x86-64
+    // Aligned to struct RelocGuestRIPMove
+    RELOC_GUEST_RIP_MOVE,
+  };
+
+  struct RelocationTypeHeader final {
+    RelocationTypes Type;
+  };
+
+  struct RelocNamedSymbolLiteral final {
+    enum class NamedSymbol : uint8_t {
+      ///< Thread specific relocations
+      // JIT Literal pointers
+      SYMBOL_LITERAL_EXITFUNCTION_LINKER,
+    };
+
+    RelocationTypeHeader Header{};
+
+    NamedSymbol Symbol;
+
+    // Offset in to the code section to begin the relocation
+    uint64_t Offset{};
+  };
+
+  struct RelocNamedThunkMove final {
+    RelocationTypeHeader Header{};
+
+    // GPR index the constant is being moved to
+    uint8_t RegisterIndex;
+
+    // The thunk SHA256 hash
+    IR::SHA256Sum Symbol;
+
+    // Offset in to the code section to begin the relocation
+    uint64_t Offset{};
+  };
+
+  struct RelocGuestRIPMove final {
+    RelocationTypeHeader Header{};
+
+    // GPR index the constant is being moved to
+    uint8_t RegisterIndex;
+
+    // Offset in to the code section to begin the relocation
+    uint64_t Offset{};
+
+    // The unrelocated RIP that is being moved
+    uint64_t GuestRIP;
+  };
+
+  union Relocation {
+    RelocationTypeHeader Header{};
+
+    RelocNamedSymbolLiteral NamedSymbolLiteral;
+    // This makes our union of relocations at least 48 bytes
+    // It might be more efficient to not use a union
+    RelocNamedThunkMove NamedThunkMove;
+
+    RelocGuestRIPMove GuestRIPMove;
+  };
+}