Kernel+LibSystem: Add a 4th syscall argument

Let's allow passing 4 function arguments to a syscall. The 4th argument
goes into ESI or RSI.

1 files changed, 11 insertions, 0 deletions

diff --git a/Kernel/API/Syscall.h b/Kernel/API/Syscall.h
index 6377d38479..30b07a0369 100644
--- a/Kernel/API/Syscall.h
+++ b/Kernel/API/Syscall.h
@@ -531,6 +531,17 @@ inline uintptr_t invoke(Function function, T1 arg1, T2 arg2, T3 arg3)
                  : "memory");
     return result;
 }
+
+template<typename T1, typename T2, typename T3, typename T4>
+inline uintptr_t invoke(Function function, T1 arg1, T2 arg2, T3 arg3, T4 arg4)
+{
+    uintptr_t result;
+    asm volatile("int $0x82"
+                 : "=a"(result)
+                 : "a"(function), "d"((uintptr_t)arg1), "c"((uintptr_t)arg2), "b"((uintptr_t)arg3), "S"((uintptr_t)arg4)
+                 : "memory");
+    return result;
+}
 #endif
 
 }