unix: add Syscall9 for gccgo

I meant to do this earlier but forget to "git add".

Change-Id: I14b777b5b9fa5b121809c5821719da3ec4a5e0ce
Reviewed-on: https://go-review.googlesource.com/9960
Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: Rob Pike <r@golang.org>

unix/gccgo.go

@@ -12,28 +12,35 @@ import "syscall"
 // much of the functionality can be written directly in Go.
 
 //extern gccgoRealSyscall
-func realSyscall(trap, a1, a2, a3, a4, a5, a6 uintptr) (r, errno uintptr)
+func realSyscall(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r, errno uintptr)
 
 func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err syscall.Errno) {
 	syscall.Entersyscall()
-	r, errno := realSyscall(trap, a1, a2, a3, 0, 0, 0)
+	r, errno := realSyscall(trap, a1, a2, a3, 0, 0, 0, 0, 0, 0)
 	syscall.Exitsyscall()
 	return r, 0, syscall.Errno(errno)
 }
 
 func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno) {
 	syscall.Entersyscall()
-	r, errno := realSyscall(trap, a1, a2, a3, a4, a5, a6)
+	r, errno := realSyscall(trap, a1, a2, a3, a4, a5, a6, 0, 0, 0)
+	syscall.Exitsyscall()
+	return r, 0, syscall.Errno(errno)
+}
+
+func Syscall9(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err syscall.Errno) {
+	syscall.Entersyscall()
+	r, errno := realSyscall(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9)
 	syscall.Exitsyscall()
 	return r, 0, syscall.Errno(errno)
 }
 
 func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err syscall.Errno) {
-	r, errno := realSyscall(trap, a1, a2, a3, 0, 0, 0)
+	r, errno := realSyscall(trap, a1, a2, a3, 0, 0, 0, 0, 0, 0)
 	return r, 0, syscall.Errno(errno)
 }
 
 func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno) {
-	r, errno := realSyscall(trap, a1, a2, a3, a4, a5, a6)
+	r, errno := realSyscall(trap, a1, a2, a3, a4, a5, a6, 0, 0, 0)
 	return r, 0, syscall.Errno(errno)
 }