BUILD_DIR := $(SCRATCH_DIR)/build
INCLUDE_DIR := $(SCRATCH_DIR)/include
BPFOBJ := $(BUILD_DIR)/libbpf/libbpf.a
+RESOLVE_BTFIDS := $(BUILD_DIR)/resolve_btfids/resolve_btfids
# Define simple and short `make test_progs`, `make test_sysctl`, etc targets
# to build individual tests.
$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(BUILD_DIR)/libbpf/ \
DESTDIR=$(SCRATCH_DIR) prefix= all install_headers
-$(BUILD_DIR)/libbpf $(BUILD_DIR)/bpftool $(INCLUDE_DIR):
+$(BUILD_DIR)/libbpf $(BUILD_DIR)/bpftool $(BUILD_DIR)/resolve_btfids $(INCLUDE_DIR):
$(call msg,MKDIR,,$@)
mkdir -p $@
cp "$(VMLINUX_H)" $@
endif
+$(RESOLVE_BTFIDS): $(BPFOBJ) | $(BUILD_DIR)/resolve_btfids \
+ $(TOOLSDIR)/bpf/resolve_btfids/main.c \
+ $(TOOLSDIR)/lib/rbtree.c \
+ $(TOOLSDIR)/lib/zalloc.c \
+ $(TOOLSDIR)/lib/string.c \
+ $(TOOLSDIR)/lib/ctype.c \
+ $(TOOLSDIR)/lib/str_error_r.c
+ $(Q)$(MAKE) $(submake_extras) -C $(TOOLSDIR)/bpf/resolve_btfids \
+ OUTPUT=$(BUILD_DIR)/resolve_btfids/ BPFOBJ=$(BPFOBJ)
+
# Get Clang's default includes on this system, as opposed to those seen by
# '-target bpf'. This fixes "missing" files on some architectures/distros,
# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
$(OUTPUT)/$(TRUNNER_BINARY): $(TRUNNER_TEST_OBJS) \
$(TRUNNER_EXTRA_OBJS) $$(BPFOBJ) \
+ $(RESOLVE_BTFIDS) \
| $(TRUNNER_BINARY)-extras
$$(call msg,BINARY,,$$@)
$$(CC) $$(CFLAGS) $$(filter %.a %.o,$$^) $$(LDLIBS) -o $$@
+ $(RESOLVE_BTFIDS) --no-fail --btf btf_data.o $$@
endef
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/err.h>
+#include <string.h>
+#include <bpf/btf.h>
+#include <bpf/libbpf.h>
+#include <linux/btf.h>
+#include <linux/kernel.h>
+#include <linux/btf_ids.h>
+#include "test_progs.h"
+
+static int duration;
+
+struct symbol {
+ const char *name;
+ int type;
+ int id;
+};
+
+struct symbol test_symbols[] = {
+ { "unused", BTF_KIND_UNKN, 0 },
+ { "S", BTF_KIND_TYPEDEF, -1 },
+ { "T", BTF_KIND_TYPEDEF, -1 },
+ { "U", BTF_KIND_TYPEDEF, -1 },
+ { "S", BTF_KIND_STRUCT, -1 },
+ { "U", BTF_KIND_UNION, -1 },
+ { "func", BTF_KIND_FUNC, -1 },
+};
+
+BTF_ID_LIST(test_list)
+BTF_ID_UNUSED
+BTF_ID(typedef, S)
+BTF_ID(typedef, T)
+BTF_ID(typedef, U)
+BTF_ID(struct, S)
+BTF_ID(union, U)
+BTF_ID(func, func)
+
+static int
+__resolve_symbol(struct btf *btf, int type_id)
+{
+ const struct btf_type *type;
+ const char *str;
+ unsigned int i;
+
+ type = btf__type_by_id(btf, type_id);
+ if (!type) {
+ PRINT_FAIL("Failed to get type for ID %d\n", type_id);
+ return -1;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(test_symbols); i++) {
+ if (test_symbols[i].id != -1)
+ continue;
+
+ if (BTF_INFO_KIND(type->info) != test_symbols[i].type)
+ continue;
+
+ str = btf__name_by_offset(btf, type->name_off);
+ if (!str) {
+ PRINT_FAIL("Failed to get name for BTF ID %d\n", type_id);
+ return -1;
+ }
+
+ if (!strcmp(str, test_symbols[i].name))
+ test_symbols[i].id = type_id;
+ }
+
+ return 0;
+}
+
+static int resolve_symbols(void)
+{
+ struct btf *btf;
+ int type_id;
+ __u32 nr;
+
+ btf = btf__parse_elf("btf_data.o", NULL);
+ if (CHECK(libbpf_get_error(btf), "resolve",
+ "Failed to load BTF from btf_data.o\n"))
+ return -1;
+
+ nr = btf__get_nr_types(btf);
+
+ for (type_id = 1; type_id <= nr; type_id++) {
+ if (__resolve_symbol(btf, type_id))
+ break;
+ }
+
+ btf__free(btf);
+ return 0;
+}
+
+int test_resolve_btfids(void)
+{
+ unsigned int i;
+ int ret = 0;
+
+ if (resolve_symbols())
+ return -1;
+
+ /* Check BTF_ID_LIST(test_list) IDs */
+ for (i = 0; i < ARRAY_SIZE(test_symbols) && !ret; i++) {
+ ret = CHECK(test_list[i] != test_symbols[i].id,
+ "id_check",
+ "wrong ID for %s (%d != %d)\n", test_symbols[i].name,
+ test_list[i], test_symbols[i].id);
+ }
+
+ return ret;
+}