1. Patch1 is dependent patch to fix zext extension error in 32-bit ARM. 2. Patch2 supports bpf fkunc in 32-bit ARM for EABI. 3. Patch3 is used to add test cases to cover some parameter scenarios states by AAPCS. 4. Patch4 fix a comment error.
The following is the test_progs result in the 32-bit ARM environment:
# uname -m armv7l # echo 1 > /proc/sys/net/core/bpf_jit_enable # ./test_progs -t kfunc_call #1/1 kfunc_call/kfunc_syscall_test_fail:OK #1/2 kfunc_call/kfunc_syscall_test_null_fail:OK #1/3 kfunc_call/kfunc_call_test_get_mem_fail_rdonly:OK #1/4 kfunc_call/kfunc_call_test_get_mem_fail_use_after_free:OK #1/5 kfunc_call/kfunc_call_test_get_mem_fail_oob:OK #1/6 kfunc_call/kfunc_call_test_get_mem_fail_not_const:OK #1/7 kfunc_call/kfunc_call_test_mem_acquire_fail:OK #1/8 kfunc_call/kfunc_call_test1:OK #1/9 kfunc_call/kfunc_call_test2:OK #1/10 kfunc_call/kfunc_call_test4:OK #1/11 kfunc_call/kfunc_call_test5:OK #1/12 kfunc_call/kfunc_call_test6:OK #1/13 kfunc_call/kfunc_call_test_ref_btf_id:OK #1/14 kfunc_call/kfunc_call_test_get_mem:OK #1/15 kfunc_call/kfunc_syscall_test:OK #1/16 kfunc_call/kfunc_syscall_test_null:OK #1/19 kfunc_call/destructive:OK
--- Changes since v2: - Remove patches to adjust sk size check for CO_RE in 32-bit arch. - Add check of kfunc's return value in insn_def_regno. - Adjust is_reg64 for insn_def_regno. - The check of CONFIG_AEABI is moved from emit_kfunc_call to bpf_jit_supports_kfunc_call. - Fix a comment error in fixup_kfunc_call.
Yang Jihong (4): bpf: Adapt 32-bit return value kfunc for 32-bit ARM when zext extension bpf: Add kernel function call support in 32-bit ARM for EABI bpf:selftests: Add kfunc_call test for mixing 32-bit and 64-bit parameters bpf: Fix comment error in fixup_kfunc_call function
arch/arm/net/bpf_jit_32.c | 137 ++++++++++++++++++ kernel/bpf/verifier.c | 46 +++++- net/bpf/test_run.c | 18 +++ .../selftests/bpf/prog_tests/kfunc_call.c | 3 + .../selftests/bpf/progs/kfunc_call_test.c | 52 +++++++ 5 files changed, 252 insertions(+), 4 deletions(-)