Add initial project files (excluding ignored content)

external/safetyhook/include/safetyhook/context.hpp

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+/// @file safetyhook/context.hpp
+/// @brief Context structure for MidHook.
+
+#pragma once
+
+#ifndef SAFETYHOOK_USE_CXXMODULES
+#include <cstdint>
+#else
+import std.compat;
+#endif
+
+#include "safetyhook/common.hpp"
+
+namespace safetyhook {
+union Xmm {
+    uint8_t u8[16];
+    uint16_t u16[8];
+    uint32_t u32[4];
+    uint64_t u64[2];
+    float f32[4];
+    double f64[2];
+};
+
+/// @brief Context structure for 64-bit MidHook.
+/// @details This structure is used to pass the context of the hooked function to the destination allowing full access
+/// to the 64-bit registers at the moment the hook is called.
+/// @note rip will point to a trampoline containing the replaced instruction(s).
+/// @note rsp is read-only. Modifying it will have no effect. Use trampoline_rsp to modify rsp if needed but make sure
+/// the top of the stack is the rip you want to resume at.
+struct Context64 {
+    Xmm xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7, xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15;
+    uintptr_t rflags, r15, r14, r13, r12, r11, r10, r9, r8, rdi, rsi, rdx, rcx, rbx, rax, rbp, rsp, trampoline_rsp, rip;
+};
+
+/// @brief Context structure for 32-bit MidHook.
+/// @details This structure is used to pass the context of the hooked function to the destination allowing full access
+/// to the 32-bit registers at the moment the hook is called.
+/// @note eip will point to a trampoline containing the replaced instruction(s).
+/// @note esp is read-only. Modifying it will have no effect. Use trampoline_esp to modify esp if needed but make sure
+/// the top of the stack is the eip you want to resume at.
+struct Context32 {
+    Xmm xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7;
+    uintptr_t eflags, edi, esi, edx, ecx, ebx, eax, ebp, esp, trampoline_esp, eip;
+};
+
+/// @brief Context structure for MidHook.
+/// @details This structure is used to pass the context of the hooked function to the destination allowing full access
+/// to the registers at the moment the hook is called.
+/// @note The structure is different depending on architecture.
+/// @note The structure only provides access to integer registers.
+#if SAFETYHOOK_ARCH_X86_64
+using Context = Context64;
+#elif SAFETYHOOK_ARCH_X86_32
+using Context = Context32;
+#endif
+
+} // namespace safetyhook