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38-btf-uprobe/examples/.gitignore

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+*.o
+*.btf
+btf-base
+btf-base-new

38-btf-uprobe/examples/Makefile

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+# BPF compiler
+BPF_CC = clang
+# BPF C flags
+BPF_CFLAGS = -O2 -target bpf -c -g
+# BPF source files
+BPF_SRCS = $(wildcard *.bpf.c)
+# BPF object files
+BPF_OBJS = $(BPF_SRCS:.c=.o)
+
+all: $(BPF_OBJS) base.btf btf-base btf-base-new base-new.btf
+
+%.bpf.o: %.bpf.c
+	$(BPF_CC) $(BPF_CFLAGS) $< -o $@
+
+btf-base.o: btf-base.c
+	clang -g -c btf-base.c -o btf-base.o
+
+btf-base-new.o: btf-base-new.c
+	clang -g -c btf-base-new.c -o btf-base-new.o
+
+base.btf: btf-base.o
+	pahole --btf_encode_detached base.btf btf-base.o
+
+base-new.btf: btf-base-new.o
+	pahole --btf_encode_detached base-new.btf btf-base-new.o
+
+btf-base: btf-base.o
+	clang -g btf-base.o -o btf-base
+
+btf-base-new: btf-base-new.o
+	clang -g btf-base-new.o -o btf-base-new
+	
+
+clean:
+	rm -f *.o *.btf btf-base btf-base-new

38-btf-uprobe/examples/btf-base-new.c

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+#include <stdio.h>
+
+struct data {
+        int a;
+        int b;
+        int c;
+        int d;
+};
+
+int add_test(struct data *d) {
+    return d->a + d->c;
+}
+
+int main(int argc, char **argv) {
+    struct data d = {1, 2, 3, 4};
+    printf("add_test(&d) = %d\n", add_test(&d));
+    return 0;
+}
+

38-btf-uprobe/examples/btf-base.c

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+#include <stdio.h>
+
+// use a different struct
+struct data {
+        int a;
+        int c;
+        int d;
+};
+
+int add_test(struct data *d) {
+    return d->a + d->c;
+}
+
+int main(int argc, char **argv) {
+    struct data d = {1, 3, 4};
+    printf("add_test(&d) = %d\n", add_test(&d));
+    return 0;
+}
+

38-btf-uprobe/examples/btf-relo.bpf.c

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+#ifndef BPF_NO_PRESERVE_ACCESS_INDEX
+#pragma clang attribute push (__attribute__((preserve_access_index)), apply_to = record)
+#endif
+
+struct data {
+        int a;
+        int c;
+        int d;
+};
+
+#ifndef BPF_NO_PRESERVE_ACCESS_INDEX
+#pragma clang attribute pop
+#endif
+
+
+int add_test(struct data *d) {
+    return d->a + d->c;
+}
+