From 3bba2df34be1680777ff85ad4fbc43717609ec75 Mon Sep 17 00:00:00 2001
From: Miguel <m.i@gmx.at>
Date: Thu, 13 Sep 2018 14:40:09 +0200
Subject: thinking about syscalls and newlib ...

---
 interface/syscall.s | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 interface/syscall.s

(limited to 'interface/syscall.s')

diff --git a/interface/syscall.s b/interface/syscall.s
new file mode 100644
index 0000000..abce63a
--- /dev/null
+++ b/interface/syscall.s
@@ -0,0 +1,16 @@
+.global syscall
+
+syscall:
+
+	push %ebx // preserve (sysV abi convnetion)
+
+	mov 0x8(%esp),%eax    //syscall number
+	mov 0xC(%esp),%edx    //p1
+	mov 0x10(%esp),%ecx   //p2
+	mov 0x14(%esp),%ebx   //p3
+	
+	int $0x80
+	mov %ebx, %eax // set as return value
+
+	pop %ebx // preserve
+	ret
-- 
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