From 8a168f2be5d90f972975abf0b40145a75c0231b7 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Wed, 21 Jul 2021 21:35:20 +0200
Subject: syscall parameter & return value passing

Sadly, sysenter on i386 limits me to only 4 arguments (so, 1 for the
syscall id + 3 real args). If that turns out to be an issue I'll either
just switch to interrupts, or switch to x64.
---
 src/init/syscall.s | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/init/syscall.s')

diff --git a/src/init/syscall.s b/src/init/syscall.s
index ebd9d0e..86d3523 100644
--- a/src/init/syscall.s
+++ b/src/init/syscall.s
@@ -2,8 +2,12 @@
 .global _syscall
 .type _syscall, @function
 _syscall:
+	mov 4(%esp), %eax
+	mov 8(%esp), %ebx
 	mov %esp, %ecx
 	mov $_syscall_ret, %edx
+	mov 12(%esp), %esi
+	mov 16(%esp), %edi
 	sysenter
 _syscall_ret:
 	ret
-- 
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