Implement bpf fsession for the riscv architecture.

Changes v3 -> v2:
* fix some comments.
* v2: https://lore.kernel.org/bpf/20260206115823.1070354-1-dongml2@chinatelecom.cn/T/#t

Changes v2 -> v1:
* use bpf_prog_calls_session_cookie() in invoke_bpf() in the 2nd patch.
* v1: https://lore.kernel.org/bpf/20260203055231.1088479-1-dongml2@chinatelecom.cn/

Menglong Dong (3):
  bpf, riscv: introduce emit_store_stack_imm64() for trampoline
  bpf, riscv: add fsession support for trampolines
  selftests/bpf: enable fsession_test on riscv64

 arch/riscv/net/bpf_jit_comp64.c               | 97 +++++++++++++++----
 .../selftests/bpf/progs/get_func_args_test.c  |  2 +-
 .../selftests/bpf/progs/get_func_ip_test.c    |  2 +-
 3 files changed, 79 insertions(+), 22 deletions(-)

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2.53.0