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The prologue generation code has been modified to make the callback program use the stack of the program marked as exception boundary where callee-saved registers are already pushed. As the bpf_throw function never returns, if it clobbers any callee-saved registers, they would remain clobbered. So, the prologue of the exception-boundary program is modified to push R23 and R24 as well, which the callback will then recover in its epilogue. The Procedure Call Standard for the Arm 64-bit Architecture[1] states that registers r19 to r28 should be saved by the callee. BPF programs on ARM64 already save all callee-saved registers except r23 and r24. This patch adds an instruction in prologue of the program to save these two registers and another instruction in the epilogue to recover them. These extra instructions are only added if bpf_throw() is used. Otherwise the emitted prologue/epilogue remains unchanged. [1] https://github.com/ARM-software/abi-aa/blob/main/aapcs64/aapcs64.rst Signed-off-by: Puranjay Mohan <puranjay12@gmail.com> Link: https://lore.kernel.org/r/20240201125225.72796-3-puranjay12@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
13 lines
1.3 KiB
Plaintext
13 lines
1.3 KiB
Plaintext
bpf_cookie/multi_kprobe_attach_api # kprobe_multi_link_api_subtest:FAIL:fentry_raw_skel_load unexpected error: -3
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bpf_cookie/multi_kprobe_link_api # kprobe_multi_link_api_subtest:FAIL:fentry_raw_skel_load unexpected error: -3
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fexit_sleep # The test never returns. The remaining tests cannot start.
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kprobe_multi_bench_attach # needs CONFIG_FPROBE
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kprobe_multi_test # needs CONFIG_FPROBE
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module_attach # prog 'kprobe_multi': failed to auto-attach: -95
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fentry_test/fentry_many_args # fentry_many_args:FAIL:fentry_many_args_attach unexpected error: -524
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fexit_test/fexit_many_args # fexit_many_args:FAIL:fexit_many_args_attach unexpected error: -524
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fill_link_info/kprobe_multi_link_info # bpf_program__attach_kprobe_multi_opts unexpected error: -95
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fill_link_info/kretprobe_multi_link_info # bpf_program__attach_kprobe_multi_opts unexpected error: -95
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fill_link_info/kprobe_multi_invalid_ubuff # bpf_program__attach_kprobe_multi_opts unexpected error: -95
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missed/kprobe_recursion # missed_kprobe_recursion__attach unexpected error: -95 (errno 95)
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