summaryrefslogtreecommitdiff
path: root/arch/s390/net/bpf_jit.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/s390/net/bpf_jit.h')
-rw-r--r--arch/s390/net/bpf_jit.h60
1 files changed, 60 insertions, 0 deletions
diff --git a/arch/s390/net/bpf_jit.h b/arch/s390/net/bpf_jit.h
new file mode 100644
index 000000000..de156ba3b
--- /dev/null
+++ b/arch/s390/net/bpf_jit.h
@@ -0,0 +1,60 @@
+/*
+ * BPF Jit compiler defines
+ *
+ * Copyright IBM Corp. 2012,2015
+ *
+ * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
+ * Michael Holzheu <holzheu@linux.vnet.ibm.com>
+ */
+
+#ifndef __ARCH_S390_NET_BPF_JIT_H
+#define __ARCH_S390_NET_BPF_JIT_H
+
+#ifndef __ASSEMBLY__
+
+#include <linux/filter.h>
+#include <linux/types.h>
+
+extern u8 sk_load_word_pos[], sk_load_half_pos[], sk_load_byte_pos[];
+extern u8 sk_load_word[], sk_load_half[], sk_load_byte[];
+
+#endif /* __ASSEMBLY__ */
+
+/*
+ * Stackframe layout (packed stack):
+ *
+ * ^ high
+ * +---------------+ |
+ * | old backchain | |
+ * +---------------+ |
+ * | r15 - r6 | |
+ * BFP -> +===============+ |
+ * | | |
+ * | BPF stack | |
+ * | | |
+ * +---------------+ |
+ * | 8 byte hlen | |
+ * R15+168 -> +---------------+ |
+ * | 4 byte align | |
+ * +---------------+ |
+ * | 4 byte temp | |
+ * | for bpf_jit.S | |
+ * R15+160 -> +---------------+ |
+ * | new backchain | |
+ * R15+152 -> +---------------+ |
+ * | + 152 byte SA | |
+ * R15 -> +---------------+ + low
+ *
+ * We get 160 bytes stack space from calling function, but only use
+ * 11 * 8 byte (old backchain + r15 - r6) for storing registers.
+ */
+#define STK_SPACE (MAX_BPF_STACK + 8 + 4 + 4 + 160)
+#define STK_160_UNUSED (160 - 11 * 8)
+#define STK_OFF (STK_SPACE - STK_160_UNUSED)
+#define STK_OFF_TMP 160 /* Offset of tmp buffer on stack */
+#define STK_OFF_HLEN 168 /* Offset of SKB header length on stack */
+
+/* Offset to skip condition code check */
+#define OFF_OK 4
+
+#endif /* __ARCH_S390_NET_BPF_JIT_H */