cpp-d1064d

[cross.git] / i686-linux-gnu-4.7 / usr / include / linux / btf.h

diff --git a/i686-linux-gnu-4.7/usr/include/linux/btf.h b/i686-linux-gnu-4.7/usr/include/linux/btf.h
new file mode 100644 (file)
index 0000000..e33a043
--- /dev/null
+++ b/i686-linux-gnu-4.7/usr/include/linux/btf.h
@@ -0,0 +1,113 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/* Copyright (c) 2018 Facebook */
+#ifndef __LINUX_BTF_H__
+#define __LINUX_BTF_H__
+
+#include <linux/types.h>
+
+#define BTF_MAGIC      0xeB9F
+#define BTF_VERSION    1
+
+struct btf_header {
+       __u16   magic;
+       __u8    version;
+       __u8    flags;
+       __u32   hdr_len;
+
+       /* All offsets are in bytes relative to the end of this header */
+       __u32   type_off;       /* offset of type section       */
+       __u32   type_len;       /* length of type section       */
+       __u32   str_off;        /* offset of string section     */
+       __u32   str_len;        /* length of string section     */
+};
+
+/* Max # of type identifier */
+#define BTF_MAX_TYPE   0x000fffff
+/* Max offset into the string section */
+#define BTF_MAX_NAME_OFFSET    0x00ffffff
+/* Max # of struct/union/enum members or func args */
+#define BTF_MAX_VLEN   0xffff
+
+struct btf_type {
+       __u32 name_off;
+       /* "info" bits arrangement
+        * bits  0-15: vlen (e.g. # of struct's members)
+        * bits 16-23: unused
+        * bits 24-27: kind (e.g. int, ptr, array...etc)
+        * bits 28-31: unused
+        */
+       __u32 info;
+       /* "size" is used by INT, ENUM, STRUCT and UNION.
+        * "size" tells the size of the type it is describing.
+        *
+        * "type" is used by PTR, TYPEDEF, VOLATILE, CONST and RESTRICT.
+        * "type" is a type_id referring to another type.
+        */
+       union {
+               __u32 size;
+               __u32 type;
+       };
+};
+
+#define BTF_INFO_KIND(info)    (((info) >> 24) & 0x0f)
+#define BTF_INFO_VLEN(info)    ((info) & 0xffff)
+
+#define BTF_KIND_UNKN          0       /* Unknown      */
+#define BTF_KIND_INT           1       /* Integer      */
+#define BTF_KIND_PTR           2       /* Pointer      */
+#define BTF_KIND_ARRAY         3       /* Array        */
+#define BTF_KIND_STRUCT                4       /* Struct       */
+#define BTF_KIND_UNION         5       /* Union        */
+#define BTF_KIND_ENUM          6       /* Enumeration  */
+#define BTF_KIND_FWD           7       /* Forward      */
+#define BTF_KIND_TYPEDEF       8       /* Typedef      */
+#define BTF_KIND_VOLATILE      9       /* Volatile     */
+#define BTF_KIND_CONST         10      /* Const        */
+#define BTF_KIND_RESTRICT      11      /* Restrict     */
+#define BTF_KIND_MAX           11
+#define NR_BTF_KINDS           12
+
+/* For some specific BTF_KIND, "struct btf_type" is immediately
+ * followed by extra data.
+ */
+
+/* BTF_KIND_INT is followed by a u32 and the following
+ * is the 32 bits arrangement:
+ */
+#define BTF_INT_ENCODING(VAL)  (((VAL) & 0x0f000000) >> 24)
+#define BTF_INT_OFFSET(VAL)    (((VAL  & 0x00ff0000)) >> 16)
+#define BTF_INT_BITS(VAL)      ((VAL)  & 0x000000ff)
+
+/* Attributes stored in the BTF_INT_ENCODING */
+#define BTF_INT_SIGNED (1 << 0)
+#define BTF_INT_CHAR   (1 << 1)
+#define BTF_INT_BOOL   (1 << 2)
+
+/* BTF_KIND_ENUM is followed by multiple "struct btf_enum".
+ * The exact number of btf_enum is stored in the vlen (of the
+ * info in "struct btf_type").
+ */
+struct btf_enum {
+       __u32   name_off;
+       __s32   val;
+};
+
+/* BTF_KIND_ARRAY is followed by one "struct btf_array" */
+struct btf_array {
+       __u32   type;
+       __u32   index_type;
+       __u32   nelems;
+};
+
+/* BTF_KIND_STRUCT and BTF_KIND_UNION are followed
+ * by multiple "struct btf_member".  The exact number
+ * of btf_member is stored in the vlen (of the info in
+ * "struct btf_type").
+ */
+struct btf_member {
+       __u32   name_off;
+       __u32   type;
+       __u32   offset; /* offset in bits */
+};
+
+#endif /* __LINUX_BTF_H__ */