windows-user-space-emulator/src/windows-emulator/context_frame.cpp

#include "std_include.hpp"
#include "context_frame.hpp"

namespace context_frame
{
	void restore(x64_emulator& emu, const CONTEXT& context)
	{
		if (context.ContextFlags & CONTEXT_DEBUG_REGISTERS)
		{
			emu.reg(x64_register::dr0, context.Dr0);
			emu.reg(x64_register::dr1, context.Dr1);
			emu.reg(x64_register::dr2, context.Dr2);
			emu.reg(x64_register::dr3, context.Dr3);
			emu.reg(x64_register::dr6, context.Dr6);
			emu.reg(x64_register::dr7, context.Dr7);
		}

		if (context.ContextFlags & CONTEXT_CONTROL)
		{
			emu.reg<uint16_t>(x64_register::ss, context.SegSs);
			emu.reg<uint16_t>(x64_register::cs, context.SegCs);

			emu.reg(x64_register::rip, context.Rip);
			emu.reg(x64_register::rsp, context.Rsp);

			emu.reg<uint32_t>(x64_register::eflags, context.EFlags);
		}

		if (context.ContextFlags & CONTEXT_INTEGER)
		{
			emu.reg(x64_register::rax, context.Rax);
			emu.reg(x64_register::rbx, context.Rbx);
			emu.reg(x64_register::rcx, context.Rcx);
			emu.reg(x64_register::rdx, context.Rdx);
			emu.reg(x64_register::rbp, context.Rbp);
			emu.reg(x64_register::rsi, context.Rsi);
			emu.reg(x64_register::rdi, context.Rdi);
			emu.reg(x64_register::r8, context.R8);
			emu.reg(x64_register::r9, context.R9);
			emu.reg(x64_register::r10, context.R10);
			emu.reg(x64_register::r11, context.R11);
			emu.reg(x64_register::r12, context.R12);
			emu.reg(x64_register::r13, context.R13);
			emu.reg(x64_register::r14, context.R14);
			emu.reg(x64_register::r15, context.R15);
		}

		/*if (context.ContextFlags & CONTEXT_SEGMENTS)
		{
			emu.reg<uint16_t>(x64_register::ds, context.SegDs);
			emu.reg<uint16_t>(x64_register::es, context.SegEs);
			emu.reg<uint16_t>(x64_register::fs, context.SegFs);
			emu.reg<uint16_t>(x64_register::gs, context.SegGs);
		}*/

		if (context.ContextFlags & CONTEXT_FLOATING_POINT)
		{
			emu.reg<uint16_t>(x64_register::fpcw, context.FltSave.ControlWord);
			emu.reg<uint16_t>(x64_register::fpsw, context.FltSave.StatusWord);
			emu.reg<uint16_t>(x64_register::fptag, context.FltSave.TagWord);

			for (int i = 0; i < 8; i++)
			{
				const auto reg = static_cast<x64_register>(static_cast<int>(x64_register::st0) + i);
				emu.reg<M128A>(reg, context.FltSave.FloatRegisters[i]);
			}
		}

		if (context.ContextFlags & CONTEXT_XSTATE)
		{
			emu.reg<uint32_t>(x64_register::mxcsr, context.MxCsr);

			for (int i = 0; i < 16; i++)
			{
				const auto reg = static_cast<x64_register>(static_cast<int>(x64_register::xmm0) + i);
				emu.reg<M128A>(reg, (&context.Xmm0)[i]);
			}
		}
	}

	void save(x64_emulator& emu, CONTEXT& context)
	{
		if (context.ContextFlags & CONTEXT_DEBUG_REGISTERS)
		{
			context.Dr0 = emu.reg(x64_register::dr0);
			context.Dr1 = emu.reg(x64_register::dr1);
			context.Dr2 = emu.reg(x64_register::dr2);
			context.Dr3 = emu.reg(x64_register::dr3);
			context.Dr6 = emu.reg(x64_register::dr6);
			context.Dr7 = emu.reg(x64_register::dr7);
		}

		if (context.ContextFlags & CONTEXT_CONTROL)
		{
			context.SegSs = emu.reg<uint16_t>(x64_register::ss);
			context.SegCs = emu.reg<uint16_t>(x64_register::cs);
			context.Rip = emu.reg(x64_register::rip);
			context.Rsp = emu.reg(x64_register::rsp);
			context.EFlags = emu.reg<uint32_t>(x64_register::eflags);
		}

		if (context.ContextFlags & CONTEXT_INTEGER)
		{
			context.Rax = emu.reg(x64_register::rax);
			context.Rbx = emu.reg(x64_register::rbx);
			context.Rcx = emu.reg(x64_register::rcx);
			context.Rdx = emu.reg(x64_register::rdx);
			context.Rbp = emu.reg(x64_register::rbp);
			context.Rsi = emu.reg(x64_register::rsi);
			context.Rdi = emu.reg(x64_register::rdi);
			context.R8 = emu.reg(x64_register::r8);
			context.R9 = emu.reg(x64_register::r9);
			context.R10 = emu.reg(x64_register::r10);
			context.R11 = emu.reg(x64_register::r11);
			context.R12 = emu.reg(x64_register::r12);
			context.R13 = emu.reg(x64_register::r13);
			context.R14 = emu.reg(x64_register::r14);
			context.R15 = emu.reg(x64_register::r15);
		}

		if (context.ContextFlags & CONTEXT_SEGMENTS)
		{
			context.SegDs = emu.reg<uint16_t>(x64_register::ds);
			context.SegEs = emu.reg<uint16_t>(x64_register::es);
			context.SegFs = emu.reg<uint16_t>(x64_register::fs);
			context.SegGs = emu.reg<uint16_t>(x64_register::gs);
		}

		if (context.ContextFlags & CONTEXT_FLOATING_POINT)
		{
			context.FltSave.ControlWord = emu.reg<uint16_t>(x64_register::fpcw);
			context.FltSave.StatusWord = emu.reg<uint16_t>(x64_register::fpsw);
			context.FltSave.TagWord = static_cast<BYTE>(emu.reg<uint16_t>(x64_register::fptag));
			for (int i = 0; i < 8; i++)
			{
				const auto reg = static_cast<x64_register>(static_cast<int>(x64_register::st0) + i);
				context.FltSave.FloatRegisters[i] = emu.reg<M128A>(reg);
			}
		}

		if (context.ContextFlags & CONTEXT_XSTATE)
		{
			context.MxCsr = emu.reg<uint32_t>(x64_register::mxcsr);
			for (int i = 0; i < 16; i++)
			{
				const auto reg = static_cast<x64_register>(static_cast<int>(x64_register::xmm0) + i);
				(&context.Xmm0)[i] = emu.reg<M128A>(reg);
			}
		}
	}
}