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.

2 files changed, 11 insertions, 0 deletions

diff --git a/Userland/Libraries/LibSystem/syscall.cpp b/Userland/Libraries/LibSystem/syscall.cpp
index 4801b1bf12..e04121d790 100644
--- a/Userland/Libraries/LibSystem/syscall.cpp
+++ b/Userland/Libraries/LibSystem/syscall.cpp
@@ -28,4 +28,9 @@ uintptr_t syscall3(uintptr_t function, uintptr_t arg0, uintptr_t arg1, uintptr_t
 {
     return Syscall::invoke((Syscall::Function)function, arg0, arg1, arg2);
 }
+
+uintptr_t syscall4(uintptr_t function, uintptr_t arg0, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3)
+{
+    return Syscall::invoke((Syscall::Function)function, arg0, arg1, arg2, arg3);
+}
 }
diff --git a/Userland/Libraries/LibSystem/syscall.h b/Userland/Libraries/LibSystem/syscall.h
index ac9f38cb55..a6cdabb227 100644
--- a/Userland/Libraries/LibSystem/syscall.h
+++ b/Userland/Libraries/LibSystem/syscall.h
@@ -15,6 +15,7 @@ uintptr_t syscall0(uintptr_t function);
 uintptr_t syscall1(uintptr_t function, uintptr_t arg0);
 uintptr_t syscall2(uintptr_t function, uintptr_t arg0, uintptr_t arg1);
 uintptr_t syscall3(uintptr_t function, uintptr_t arg0, uintptr_t arg1, uintptr_t arg2);
+uintptr_t syscall4(uintptr_t function, uintptr_t arg0, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3);
 }
 
 #ifdef __cplusplus
@@ -39,4 +40,9 @@ inline uintptr_t syscall(auto function, auto arg0, auto arg1, auto arg2)
     return syscall3((uintptr_t)function, (uintptr_t)arg0, (uintptr_t)arg1, (uintptr_t)arg2);
 }
 
+inline uintptr_t syscall(auto function, auto arg0, auto arg1, auto arg2, auto arg3)
+{
+    return syscall4((uintptr_t)function, (uintptr_t)arg0, (uintptr_t)arg1, (uintptr_t)arg2, (uintptr_t)arg3);
+}
+
 #endif