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Commit 73bc4d9f authored by Yonghong Song's avatar Yonghong Song Committed by Alexei Starovoitov
Browse files

tools/bpf: add ksym_get_addr() in trace_helpers 



Given a kernel function name, ksym_get_addr() will return the kernel
address for this function, or 0 if it cannot find this function name
in /proc/kallsyms. This function will be used later when a kernel
address is used to initiate a kprobe perf event.

Acked-by: default avatarMartin KaFai Lau <kafai@fb.com>
Signed-off-by: default avatarYonghong Song <yhs@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 30687ad9

tools/testing/selftests/bpf/trace_helpers.c

+12 −0
Original line number Diff line number Diff line
@@ -72,6 +72,18 @@ struct ksym *ksym_search(long key) 
	return &syms[0];

}



long ksym_get_addr(const char *name)

{

	int i;



	for (i = 0; i < sym_cnt; i++) {

		if (strcmp(syms[i].name, name) == 0)

			return syms[i].addr;

	}



	return 0;

}



static int page_size;

static int page_cnt = 8;

static struct perf_event_mmap_page *header;

tools/testing/selftests/bpf/trace_helpers.h

+1 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ struct ksym { 


int load_kallsyms(void);

struct ksym *ksym_search(long key);

long ksym_get_addr(const char *name);



typedef enum bpf_perf_event_ret (*perf_event_print_fn)(void *data, int size);