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bpf: Add trampolines to kallsyms

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Adding trampolines to kallsyms. It's displayed as
  bpf_trampoline_<ID> [bpf]

where ID is the BTF id of the trampoline function.

Adding bpf_image_ksym_add/del functions that setup
the start/end values and call KSYMBOL perf events
handlers.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200312195610.346362-11-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiri Olsa
2020-03-12 20:56:05 +01:00
committed by Alexei Starovoitov
parent dba122fb5e
commit a108f7dcfa
2 changed files with 31 additions and 0 deletions
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3
include/linux/bpf.h
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@@ -513,6 +513,7 @@ struct bpf_trampoline {
/* Executable image of trampoline */
void *image;
u64 selector;
struct bpf_ksym ksym;
};
#define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
@@ -585,6 +586,8 @@ struct bpf_image {
bool is_bpf_image_address(unsigned long address);
void *bpf_image_alloc(void);
/* Called only from JIT-enabled code, so there's no need for stubs. */
void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
void bpf_image_ksym_del(struct bpf_ksym *ksym);
void bpf_ksym_add(struct bpf_ksym *ksym);
void bpf_ksym_del(struct bpf_ksym *ksym);
#else