From 2db7cdb71eec036d1696dfa2ff9d8efc187e870a Mon Sep 17 00:00:00 2001
From: Bananymous <bananymousosq@gmail.com>
Date: Fri, 21 Jul 2023 11:01:19 +0300
Subject: [PATCH] Kernel: Syscalls now get the interrupt stack

---
 kernel/arch/x86_64/interrupts.S        |  4 ++++
 kernel/include/kernel/InterruptStack.h | 17 +++++++++++++++++
 kernel/kernel/Syscall.cpp              |  4 +++-
 3 files changed, 24 insertions(+), 1 deletion(-)
 create mode 100644 kernel/include/kernel/InterruptStack.h

diff --git a/kernel/arch/x86_64/interrupts.S b/kernel/arch/x86_64/interrupts.S
index ad6aa971..eacf910a 100644
--- a/kernel/arch/x86_64/interrupts.S
+++ b/kernel/arch/x86_64/interrupts.S
@@ -163,7 +163,11 @@ syscall_asm:
 	movq %rax, %rdi
 	movq %rbx, %rsi
 	xchgq %rcx, %rdx
+	movq %rsp, %rbx
+	addq $120, %rbx
+	pushq %rbx
 	call cpp_syscall_handler
+	addq $8, %rsp
 	popaq_no_rax
 	addq $8, %rsp
 	iretq
\ No newline at end of file
diff --git a/kernel/include/kernel/InterruptStack.h b/kernel/include/kernel/InterruptStack.h
new file mode 100644
index 00000000..84416b5f
--- /dev/null
+++ b/kernel/include/kernel/InterruptStack.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include <stdint.h>
+
+namespace Kernel
+{
+
+	struct InterruptStack
+	{
+		uint64_t rip;
+		uint64_t cs;
+		uint64_t flags;
+		uint64_t rsp;
+		uint64_t ss;
+	};
+
+}
\ No newline at end of file
diff --git a/kernel/kernel/Syscall.cpp b/kernel/kernel/Syscall.cpp
index c112f029..219828ff 100644
--- a/kernel/kernel/Syscall.cpp
+++ b/kernel/kernel/Syscall.cpp
@@ -1,4 +1,5 @@
 #include <kernel/Debug.h>
+#include <kernel/InterruptStack.h>
 #include <kernel/Process.h>
 #include <kernel/Syscall.h>
 
@@ -17,7 +18,7 @@ namespace Kernel
 
 	extern "C" long sys_fork_trampoline();
 
-	extern "C" long cpp_syscall_handler(int syscall, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3, uintptr_t arg4, uintptr_t arg5)
+	extern "C" long cpp_syscall_handler(int syscall, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3, uintptr_t arg4, uintptr_t arg5, InterruptStack& interrupt_stack)
 	{
 		Thread::current().set_in_syscall(true);
 
@@ -28,6 +29,7 @@ namespace Kernel
 		(void)arg3;
 		(void)arg4;
 		(void)arg5;
+		(void)interrupt_stack;
 
 		BAN::ErrorOr<long> ret = BAN::Error::from_errno(ENOSYS);