1 files changed, 40 insertions, 0 deletions
diff --git a/arch/um/kernel/skas/syscall.c b/arch/um/kernel/skas/syscall.c
new file mode 100644
index 000000000..c0681e097
--- /dev/null
+++ b/arch/um/kernel/skas/syscall.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/kernel.h>
+#include <linux/ptrace.h>
+#include <kern_util.h>
+#include <sysdep/ptrace.h>
+#include <sysdep/syscalls.h>
+
+extern int syscall_table_size;
+#define NR_SYSCALLS (syscall_table_size / sizeof(void *))
+
+void handle_syscall(struct uml_pt_regs *r)
+{
+	struct pt_regs *regs = container_of(r, struct pt_regs, regs);
+	long result;
+	int syscall;
+
+	syscall_trace_enter(regs);
+
+	/*
+	 * This should go in the declaration of syscall, but when I do that,
+	 * strace -f -c bash -c 'ls ; ls' breaks, sometimes not tracing
+	 * children at all, sometimes hanging when bash doesn't see the first
+	 * ls exit.
+	 * The assembly looks functionally the same to me.  This is
+	 *     gcc version 4.0.1 20050727 (Red Hat 4.0.1-5)
+	 * in case it's a compiler bug.
+	 */
+	syscall = UPT_SYSCALL_NR(r);
+	if ((syscall >= NR_SYSCALLS) || (syscall < 0))
+		result = -ENOSYS;
+	else result = EXECUTE_SYSCALL(syscall, regs);
+
+	PT_REGS_SET_SYSCALL_RETURN(regs, result);
+
+	syscall_trace_leave(regs);
+}