These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / arch / mips / net / bpf_jit.h

diff --git a/kernel/arch/mips/net/bpf_jit.h b/kernel/arch/mips/net/bpf_jit.h
index 3a5751b..8f9f548 100644 (file)
--- a/kernel/arch/mips/net/bpf_jit.h
+++ b/kernel/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 */