Similar to commit 98770bd4e6df ("bpf,x86: add fsession support for x86_64"),
add fsession support on arm64.

Patch #1 implements fsession support in the arm64 BPF JIT trampoline.

Patch #2 enables the relevant selftests on arm64, including fsession,
get_func_ip, and get_func_args.

All enabled tests pass on arm64:

 cd tools/testing/selftests/bpf
 ./test_progs -t fsession
 #135/1   fsession_test/fsession_test:OK
 #135/2   fsession_test/fsession_reattach:OK
 #135/3   fsession_test/fsession_cookie:OK
 #135     fsession_test:OK
 Summary: 1/3 PASSED, 0 SKIPPED, 0 FAILED

 ./test_progs -t get_func
 #138     get_func_args_test:OK
 #139     get_func_ip_test:OK
 Summary: 2/0 PASSED, 0 SKIPPED, 0 FAILED

Leon Hwang (2):
  bpf, arm64: Add fsession support
  bpf/selftests: Enable fsession and get_func_ tests on arm64*

 arch/arm64/net/bpf_jit_comp.c                 | 66 ++++++++++++++++---
 include/linux/bpf.h                           |  7 +-
 .../selftests/bpf/prog_tests/fsession_test.c  |  2 +-
 .../selftests/bpf/progs/get_func_args_test.c  |  2 +-
 .../selftests/bpf/progs/get_func_ip_test.c    |  2 +-
 5 files changed, 66 insertions(+), 13 deletions(-)

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2.52.0