bpf, arm64: support up to 12 arguments#8987
bpf, arm64: support up to 12 arguments#8987kernel-patches-daemon-bpf[bot] wants to merge 3 commits intobpf-next_basefrom
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Currently ARM64 bpf trampoline supports up to 8 function arguments. According to the statistics from commit 473e315 ("bpf, x86: allow function arguments up to 12 for TRACING"), there are about 200 functions accept 9 to 12 arguments, so adding support for up to 12 function arguments. Due to bpf only supporting function arguments up to 16 bytes, according to AAPCS64, starting from the first argument, each argument is first attempted to be loaded to 1 or 2 smallest registers from x0-x7, if there are no enough registers to hold the entire argument, then all remaining arguments starting from this one are pushed to the stack for passing. There are some non-trivial cases for which it is not possible to correctly read arguments from/write arguments to the stack: for example struct variables may have custom packing/alignment attributes that are invisible in BTF info. Such cases are denied for now to make sure not to read incorrect values. Signed-off-by: Xu Kuohai <xukuohai@huawei.com> Co-developed-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com> Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
Now that support for up to 12 args is enabled for tracing programs on ARM64, enable the existing tests for this feature on this architecture. Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=966617 irrelevant now. Closing PR. |
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Pull request for series with
subject: bpf, arm64: support up to 12 arguments
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=965353