Kernel: Syscalls now get the interrupt stack

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

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;
+	};
+
+}

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);