bpf,x86: add fsession support for x86_64

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Add BPF_TRACE_FSESSION supporting to x86_64, including:

1. clear the return value in the stack before fentry to make the fentry
   of the fsession can only get 0 with bpf_get_func_ret().

2. clear all the session cookies' value in the stack.

2. store the index of the cookie to ctx[-1] before the calling to fsession

3. store the "is_return" flag to ctx[-1] before the calling to fexit of
   the fsession.

Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
Co-developed-by: Leon Hwang <leon.hwang@linux.dev>
Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/r/20260124062008.8657-8-dongml2@chinatelecom.cn
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Menglong Dong 2026-01-24 14:20:02 +08:00 • committed by Alexei Starovoitov

parent 37c7ba1b39

commit 98770bd4e6

1 changed files with 40 additions and 12 deletions

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arch/x86/net/bpf_jit_comp.c

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