From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 arch/x86/um/stub_32.S | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 arch/x86/um/stub_32.S

(limited to 'arch/x86/um/stub_32.S')

diff --git a/arch/x86/um/stub_32.S b/arch/x86/um/stub_32.S
new file mode 100644
index 00000000..b972649d
--- /dev/null
+++ b/arch/x86/um/stub_32.S
@@ -0,0 +1,51 @@
+#include <as-layout.h>
+
+	.globl syscall_stub
+.section .__syscall_stub, "ax"
+
+	.globl batch_syscall_stub
+batch_syscall_stub:
+	/* load pointer to first operation */
+	mov	$(STUB_DATA+8), %esp
+
+again:
+	/* load length of additional data */
+	mov	0x0(%esp), %eax
+
+	/* if(length == 0) : end of list */
+	/* write possible 0 to header */
+	mov	%eax, STUB_DATA+4
+	cmpl	$0, %eax
+	jz	done
+
+	/* save current pointer */
+	mov	%esp, STUB_DATA+4
+
+	/* skip additional data */
+	add	%eax, %esp
+
+	/* load syscall-# */
+	pop	%eax
+
+	/* load syscall params */
+	pop	%ebx
+	pop	%ecx
+	pop	%edx
+	pop	%esi
+ 	pop	%edi
+	pop	%ebp
+
+	/* execute syscall */
+	int	$0x80
+
+	/* check return value */
+	pop	%ebx
+	cmp	%ebx, %eax
+	je	again
+
+done:
+	/* save return value */
+	mov	%eax, STUB_DATA
+
+	/* stop */
+	int3
-- 
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