From e5fd91f1ef340da553f7a79da9540c3db711c937 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Tue, 8 Sep 2015 01:01:14 -0300
Subject: Linux-libre 4.2-gnu

---
 arch/mips/net/bpf_jit.h | 42 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 41 insertions(+), 1 deletion(-)

(limited to 'arch/mips/net/bpf_jit.h')

diff --git a/arch/mips/net/bpf_jit.h b/arch/mips/net/bpf_jit.h
index 3a5751b43..8f9f54841 100644
--- a/arch/mips/net/bpf_jit.h
+++ b/arch/mips/net/bpf_jit.h
@@ -15,9 +15,10 @@
 /* Registers used by JIT */
 #define MIPS_R_ZERO	0
 #define MIPS_R_V0	2
-#define MIPS_R_V1	3
 #define MIPS_R_A0	4
 #define MIPS_R_A1	5
+#define MIPS_R_T4	12
+#define MIPS_R_T5	13
 #define MIPS_R_T6	14
 #define MIPS_R_T7	15
 #define MIPS_R_S0	16
@@ -41,4 +42,43 @@
 #define MIPS_COND_X	(0x1 << 5)
 #define MIPS_COND_K	(0x1 << 6)
 
+#define r_ret	MIPS_R_V0
+
+/*
+ * Use 2 scratch registers to avoid pipeline interlocks.
+ * There is no overhead during epilogue and prologue since
+ * any of the $s0-$s6 registers will only be preserved if
+ * they are going to actually be used.
+ */
+#define r_skb_hl	MIPS_R_S0 /* skb header length */
+#define r_skb_data	MIPS_R_S1 /* skb actual data */
+#define r_off		MIPS_R_S2
+#define r_A		MIPS_R_S3
+#define r_X		MIPS_R_S4
+#define r_skb		MIPS_R_S5
+#define r_M		MIPS_R_S6
+#define r_skb_len	MIPS_R_S7
+#define r_s0		MIPS_R_T4 /* scratch reg 1 */
+#define r_s1		MIPS_R_T5 /* scratch reg 2 */
+#define r_tmp_imm	MIPS_R_T6 /* No need to preserve this */
+#define r_tmp		MIPS_R_T7 /* No need to preserve this */
+#define r_zero		MIPS_R_ZERO
+#define r_sp		MIPS_R_SP
+#define r_ra		MIPS_R_RA
+
+#ifndef __ASSEMBLY__
+
+/* Declare ASM helpers */
+
+#define DECLARE_LOAD_FUNC(func) \
+	extern u8 func(unsigned long *skb, int offset); \
+	extern u8 func##_negative(unsigned long *skb, int offset); \
+	extern u8 func##_positive(unsigned long *skb, int offset)
+
+DECLARE_LOAD_FUNC(sk_load_word);
+DECLARE_LOAD_FUNC(sk_load_half);
+DECLARE_LOAD_FUNC(sk_load_byte);
+
+#endif
+
 #endif /* BPF_JIT_MIPS_OP_H */
-- 
cgit v1.2.3-54-g00ecf