From 0d2ddecc9aeb232746b76b4eebdb1381053a8951 Mon Sep 17 00:00:00 2001
From: Ada Christine <adachristine18@gmail.com>
Date: Mon, 27 Jan 2025 02:05:07 +0000
Subject: checkpoint. we can fake syscall with the dummy gdt

---
 boot/fake_syscall_entry.S | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 boot/fake_syscall_entry.S

(limited to 'boot/fake_syscall_entry.S')

diff --git a/boot/fake_syscall_entry.S b/boot/fake_syscall_entry.S
new file mode 100644
index 0000000..ff2428d
--- /dev/null
+++ b/boot/fake_syscall_entry.S
@@ -0,0 +1,25 @@
+.section .text
+
+.extern fake_syscall_handler
+
+.global fake_syscall_entry
+fake_syscall_entry:
+	hlt
+
+.global fake_syscall_return 
+fake_syscall_return:
+	cli
+	mov %rdi, %rsp
+	lgdt (%rsp)
+	add $16, %rsp
+
+	movw (%rsp), %ds
+	movw (%rsp), %es
+	movw (%rsp), %fs
+	movw (%rsp), %gs
+	movw (%rsp), %ss
+
+	add $8, %rsp
+
+	lretq
+
-- 
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