From 6ed8a39c1bd3083297b41e981a2bf4bdbe2abd1f Mon Sep 17 00:00:00 2001
From: Amlal El Mahrouss <amlal.elmahrouss@icloud.com>
Date: Thu, 21 Nov 2024 08:50:57 +0100
Subject: IMP: Add UserProcessImage structure to hold the code/entrypoint of
 the process. IMP: Use IDLLObject instead of IPEFDLLObject. IMP: Refactor
 DeviceInterface to IDeviceObject. ADD: rt_jump_to_address when you want to
 use a custom stack.

Signed-off-by: Amlal El Mahrouss <amlal.elmahrouss@icloud.com>
---
 dev/ZBAKit/src/BootThread.cc         | 20 ++++++++++++++++----
 dev/ZBAKit/src/HEL/AMD64/BootAPI.S   |  8 ++++++++
 dev/ZBAKit/src/HEL/AMD64/BootMain.cc |  4 ++--
 3 files changed, 26 insertions(+), 6 deletions(-)

(limited to 'dev/ZBAKit/src')

diff --git a/dev/ZBAKit/src/BootThread.cc b/dev/ZBAKit/src/BootThread.cc
index 2ff8f7df..6ce14877 100644
--- a/dev/ZBAKit/src/BootThread.cc
+++ b/dev/ZBAKit/src/BootThread.cc
@@ -15,13 +15,15 @@
 #include <CFKit/Utils.h>
 #include <Modules/FB/Text.h>
 
-// External boot services symbol.
+/// @brief External boot services symbol.
 EXTERN EfiBootServices* BS;
 
 /// @note BThread doesn't parse the symbols so doesn't nullify them, .bss is though.
 
 namespace Boot
 {
+	EXTERN_C Void rt_jump_to_address(VoidPtr code, HEL::HANDOVER_INFO_HEADER* handover, UInt8* stack);
+
 	BThread::BThread(VoidPtr blob)
 		: fBlob(blob), fStartAddress(nullptr)
 	{
@@ -158,12 +160,14 @@ namespace Boot
 		}
 		else
 		{
-			writer.Write("ZBA: Invalid executable.\r");
+			writer.Write("ZBA: INVALID EXECUTABLE.\r");
 		}
+
+		fStack = new UInt8[mib_cast(8)];
 	}
 
 	/// @note handover header has to be valid!
-	Void BThread::Start(HEL::HANDOVER_INFO_HEADER* handover)
+	Void BThread::Start(HEL::HANDOVER_INFO_HEADER* handover, Bool own_stack)
 	{
 		HEL::HandoverProc err_fn = [](HEL::HANDOVER_INFO_HEADER* rcx) -> void {
 			CGDrawString("ZBA: INVALID IMAGE! ABORTING...", 50, 10, RGB(0xFF, 0xFF, 0xFF));
@@ -175,7 +179,15 @@ namespace Boot
 			err_fn(handover);
 		}
 
-		reinterpret_cast<HEL::HandoverProc>(fStartAddress)(handover);
+		fHandover = handover;
+
+		if (own_stack)
+			rt_jump_to_address(fStartAddress, fHandover, &fStack[mib_cast(8) - 1]);
+		else
+		{
+			delete [] fStack;
+			reinterpret_cast<HEL::HandoverProc>(fStartAddress)(fHandover);
+		}
 	}
 
 	const Char* BThread::GetName()
diff --git a/dev/ZBAKit/src/HEL/AMD64/BootAPI.S b/dev/ZBAKit/src/HEL/AMD64/BootAPI.S
index 47f250f1..963ef46a 100644
--- a/dev/ZBAKit/src/HEL/AMD64/BootAPI.S
+++ b/dev/ZBAKit/src/HEL/AMD64/BootAPI.S
@@ -11,8 +11,16 @@
 rt_jump_to_address:
     mov rbx, rcx
     mov rcx, rdx
+    push rbx
+    push rdx
+    mov rsp, r8
+    push rax
     jmp rbx
 
+    pop rdx
+    pop rbx
+    pop rax
+
     ret
 
 rt_reset_hardware:
diff --git a/dev/ZBAKit/src/HEL/AMD64/BootMain.cc b/dev/ZBAKit/src/HEL/AMD64/BootMain.cc
index cfc02837..404d8e3b 100644
--- a/dev/ZBAKit/src/HEL/AMD64/BootMain.cc
+++ b/dev/ZBAKit/src/HEL/AMD64/BootMain.cc
@@ -246,7 +246,7 @@ EFI_EXTERN_C EFI_API Int32 Main(EfiHandlePtr	ImageHandle,
 		syschk_thread->SetName("System Check (ZBA EFI Driver)");
 	}
 
-	syschk_thread->Start(handover_hdr);
+	syschk_thread->Start(handover_hdr, NO);
 
 	// nullify these fields, to avoid being reused later.
 
@@ -324,7 +324,7 @@ EFI_EXTERN_C EFI_API Int32 Main(EfiHandlePtr	ImageHandle,
 	// Finally load the OS kernel.
 	// ---------------------------------------------------- //
 
-	kernel_thread->Start(handover_hdr);
+	kernel_thread->Start(handover_hdr, YES);
 
 	CANT_REACH();
 }
-- 
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