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Xu Kuohai 9014cf56f1 bpf, arm64: Support up to 12 function arguments 
Currently ARM64 bpf trampoline supports up to 8 function arguments.
According to the statistics from commit
473e3150e3 ("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>
Link: https://lore.kernel.org/r/20250527-many_args_arm64-v3-1-3faf7bb8e4a2@bootlin.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2025-05-27 10:50:31 -07:00
arch bpf, arm64: Support up to 12 function arguments 2025-05-27 10:50:31 -07:00
block block-6.15-20250424 2025-04-25 11:34:39 -07:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: scomp - Fix off-by-one bug when calculating last page 2025-04-23 09:32:57 +08:00
Documentation bpf: Add support for __prog argument suffix to pass in prog->aux 2025-05-13 18:47:54 -07:00
drivers bpf: Add dmabuf iterator 2025-05-27 09:51:25 -07:00
fs vfs-6.15-rc4.fixes 2025-04-25 15:57:21 -07:00
include bpf: Add dmabuf iterator 2025-05-27 09:51:25 -07:00
init Kconfig: switch CONFIG_SYSFS_SYCALL default to n 2025-04-15 10:28:35 +02:00
io_uring io_uring: fix 'sync' handling of io_fallback_tw() 2025-04-24 10:32:43 -06:00
ipc treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
kernel bpf: Check rcu_read_lock_trace_held() in bpf_map_lookup_percpu_elem() 2025-05-27 10:45:59 -07:00
lib hardening fixes for v6.15-rc3 2025-04-18 13:20:20 -07:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm/migrate: fix sleep in atomic for large folios and buffer heads 2025-04-22 18:16:08 +02:00
net bpf, sockmap: Avoid using sk_socket after free when sending 2025-05-22 16:16:37 -07:00
rust Driver core fixes for 6.15-rc4 2025-04-25 10:02:59 -07:00
samples samples/bpf: Fix compilation failure for samples/bpf on LoongArch Fedora 2025-04-25 09:32:02 -07:00
scripts scripts/bpf_doc.py: implement json output format 2025-05-09 11:31:23 -07:00
security Landlock fix for v6.15-rc4 2025-04-24 12:59:05 -07:00
sound ASoC: Fixes for v6.15 2025-04-11 15:51:19 +02:00
tools bpftool: Add support for custom BTF path in prog load/loadall 2025-05-27 10:31:20 -07:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-05 04:06:45 +09:00
virt ARM: 2025-04-08 13:47:55 -07:00
.clang-format clang-format: Update the ForEachMacros list for v6.15-rc1 2025-04-13 11:03:59 +02:00
.clippy.toml rust: give Clippy the minimum supported Rust version 2025-01-10 00:17:25 +01:00
.cocciconfig
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: Retire Ralf Baechle 2024-11-12 15:48:59 +01:00
.gitattributes
.gitignore kbuild: Create intermediate vmlinux build with relocations preserved 2025-03-17 00:29:50 +09:00
.mailmap sound fixes for 6.15-rc3 2025-04-17 10:14:51 -07:00
.rustfmt.toml
COPYING
CREDITS MAINTAINERS: update SLAB ALLOCATOR maintainers 2025-04-17 20:10:06 -07:00
Kbuild drm: ensure drm headers are self-contained and pass kernel-doc 2025-02-12 10:44:43 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS pci-v6.15-fixes-3 2025-04-26 13:02:36 -07:00
Makefile Linux 6.15-rc4 2025-04-27 15:19:23 -07:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.