diff mbox series

[v4,bpf-next,11/14] tools headers: Adopt verbatim copy of btf_ids.h from kernel sources

Message ID 20200625221304.2817194-12-jolsa@kernel.org
State Changes Requested
Delegated to: BPF Maintainers
Headers show
Series bpf: Add d_path helper | expand

Commit Message

Jiri Olsa June 25, 2020, 10:13 p.m. UTC
It will be needed by bpf selftest for resolve_btfids tool.

Also adding __PASTE macro as btf_ids.h dependency, which is
defined in:

  include/linux/compiler_types.h

but because tools/include do not have this header, I'm putting
the macro into linux/compiler.h header.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/include/linux/btf_ids.h  | 108 +++++++++++++++++++++++++++++++++
 tools/include/linux/compiler.h |   4 ++
 2 files changed, 112 insertions(+)
 create mode 100644 tools/include/linux/btf_ids.h

Comments

Andrii Nakryiko June 26, 2020, 9:51 p.m. UTC | #1
On Thu, Jun 25, 2020 at 4:48 PM Jiri Olsa <jolsa@kernel.org> wrote:
>
> It will be needed by bpf selftest for resolve_btfids tool.
>
> Also adding __PASTE macro as btf_ids.h dependency, which is
> defined in:
>
>   include/linux/compiler_types.h
>
> but because tools/include do not have this header, I'm putting
> the macro into linux/compiler.h header.
>
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> ---

I don't like `#define GUARD 1`, but besides that:

Acked-by: Andrii Nakryiko <andriin@fb.com>

>  tools/include/linux/btf_ids.h  | 108 +++++++++++++++++++++++++++++++++
>  tools/include/linux/compiler.h |   4 ++
>  2 files changed, 112 insertions(+)
>  create mode 100644 tools/include/linux/btf_ids.h
>

[...]
diff mbox series

Patch

diff --git a/tools/include/linux/btf_ids.h b/tools/include/linux/btf_ids.h
new file mode 100644
index 000000000000..5eb8983ee0a0
--- /dev/null
+++ b/tools/include/linux/btf_ids.h
@@ -0,0 +1,108 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _LINUX_BTF_IDS_H
+#define _LINUX_BTF_IDS_H 1
+
+#include <linux/compiler.h> /* for __PASTE */
+
+/*
+ * Following macros help to define lists of BTF IDs placed
+ * in .BTF_ids section. They are initially filled with zeros
+ * (during compilation) and resolved later during the
+ * linking phase by btfid tool.
+ *
+ * Any change in list layout must be reflected in btfid
+ * tool logic.
+ */
+
+#define BTF_IDS_SECTION ".BTF.ids"
+
+#define ____BTF_ID(symbol)				\
+asm(							\
+".pushsection " BTF_IDS_SECTION ",\"a\";       \n"	\
+".local " #symbol " ;                          \n"	\
+".type  " #symbol ", @object;                  \n"	\
+".size  " #symbol ", 4;                        \n"	\
+#symbol ":                                     \n"	\
+".zero 4                                       \n"	\
+".popsection;                                  \n");
+
+#define __BTF_ID(symbol) \
+	____BTF_ID(symbol)
+
+#define __ID(prefix) \
+	__PASTE(prefix, __COUNTER__)
+
+/*
+ * The BTF_ID defines unique symbol for each ID pointing
+ * to 4 zero bytes.
+ */
+#define BTF_ID(prefix, name) \
+	__BTF_ID(__ID(__BTF_ID__##prefix##__##name##__))
+
+/*
+ * The BTF_ID_LIST macro defines pure (unsorted) list
+ * of BTF IDs, with following layout:
+ *
+ * BTF_ID_LIST(list1)
+ * BTF_ID(type1, name1)
+ * BTF_ID(type2, name2)
+ *
+ * list1:
+ * __BTF_ID__type1__name1__1:
+ * .zero 4
+ * __BTF_ID__type2__name2__2:
+ * .zero 4
+ *
+ */
+#define __BTF_ID_LIST(name)				\
+asm(							\
+".pushsection " BTF_IDS_SECTION ",\"a\";       \n"	\
+".local " #name ";                             \n"	\
+#name ":;                                      \n"	\
+".popsection;                                  \n");	\
+
+#define BTF_ID_LIST(name)				\
+__BTF_ID_LIST(name)					\
+extern int name[];
+
+struct btf_id_set {
+	u32 cnt;
+	u32 ids[];
+};
+
+/*
+ * The BTF_SET_START/END macros pair defines sorted list of
+ * BTF IDs plus its members count, with following layout:
+ *
+ * BTF_SET_START(list)
+ * BTF_ID(type1, name1)
+ * BTF_ID(type2, name2)
+ * BTF_SET_END(list)
+ *
+ * __BTF_ID__set__list:
+ * .zero 4
+ * list:
+ * __BTF_ID__type1__name1__3:
+ * .zero 4
+ * __BTF_ID__type2__name2__4:
+ * .zero 4
+ *
+ */
+#define BTF_SET_START(name)				\
+__BTF_ID_LIST(name)					\
+asm(							\
+".pushsection " BTF_IDS_SECTION ",\"a\";       \n"	\
+".local __BTF_ID__set__" #name ";              \n"	\
+"__BTF_ID__set__" #name ":;                    \n"	\
+".zero 4                                       \n"	\
+".popsection;                                  \n");	\
+
+#define BTF_SET_END(name)				\
+asm(							\
+".pushsection " BTF_IDS_SECTION ",\"a\";      \n"	\
+".size __BTF_ID__set__" #name ", .-" #name "  \n"	\
+".popsection;                                 \n");	\
+extern struct btf_id_set name;
+
+#endif
diff --git a/tools/include/linux/compiler.h b/tools/include/linux/compiler.h
index 9f9002734e19..6eac24d44e81 100644
--- a/tools/include/linux/compiler.h
+++ b/tools/include/linux/compiler.h
@@ -201,4 +201,8 @@  static __always_inline void __write_once_size(volatile void *p, void *res, int s
 # define __fallthrough
 #endif
 
+/* Indirect macros required for expanded argument pasting, eg. __LINE__. */
+#define ___PASTE(a, b) a##b
+#define __PASTE(a, b) ___PASTE(a, b)
+
 #endif /* _TOOLS_LINUX_COMPILER_H */