From 35e949ef5ee8a8604b0e89b7ffd1dffff85987d6 Mon Sep 17 00:00:00 2001
From: Bananymous <bananymousosq@gmail.com>
Date: Fri, 21 Apr 2023 11:08:02 +0300
Subject: [PATCH] Kernel: Fix syscall return value in 32 bit

---
 kernel/arch/i386/IDT.cpp | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/kernel/arch/i386/IDT.cpp b/kernel/arch/i386/IDT.cpp
index f75e1ace..e4f2bcc2 100644
--- a/kernel/arch/i386/IDT.cpp
+++ b/kernel/arch/i386/IDT.cpp
@@ -174,7 +174,18 @@ found:
 		"addl $16, %esp;"
 		"popw %es;"
 		"popw %ds;"
-		"popa;"
+		
+		// NOTE: following instructions are same as in 'popa', except we skip eax
+		//       since it holds the return value of the syscall.
+		"popl %edi;"
+		"popl %esi;"
+		"popl %ebp;"
+		"addl $4, %esp;"
+		"popl %ebx;"
+		"popl %edx;"
+		"popl %ecx;"
+		"addl $4, %esp;"
+		
 		"iret;"
 	);