diff options
| author | Yonghong Song <yonghong.song@linux.dev> | 2026-04-23 06:35:06 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2026-04-23 17:54:50 +0300 |
| commit | 246ad6e5ee259669692bdb7fb353e8c5d5bba628 (patch) | |
| tree | cf9cb1e8630835ace90217142b43b173e4784259 /include/linux | |
| parent | 9b9f0b42703ceb88332bcb19453c4288c2683e34 (diff) | |
| download | linux-246ad6e5ee259669692bdb7fb353e8c5d5bba628.tar.xz | |
bpf: Introduce bpf register BPF_REG_PARAMS
Introduce BPF_REG_PARAMS as a dedicated BPF register for stack
argument accesses. It occupies the BPF register number 11 (R11),
which is used as the base pointer for the stack argument area,
keeping it separate from the R10-based (BPF_REG_FP) program stack.
The kernel-internal hidden register BPF_REG_AX previously occupied
slot 11 (MAX_BPF_REG). With BPF_REG_PARAMS taking that slot,
BPF_REG_AX moves to slot 12 and MAX_BPF_EXT_REG increases
accordingly.
Acked-by: Puranjay Mohan <puranjay@kernel.org>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20260423033506.2542005-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/filter.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/include/linux/filter.h b/include/linux/filter.h index 1ec6d5ba64cc..b77d0b06db6e 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -58,8 +58,9 @@ struct ctl_table_header; #define BPF_REG_H BPF_REG_9 /* hlen, callee-saved */ /* Kernel hidden auxiliary/helper register. */ -#define BPF_REG_AX MAX_BPF_REG -#define MAX_BPF_EXT_REG (MAX_BPF_REG + 1) +#define BPF_REG_PARAMS MAX_BPF_REG +#define BPF_REG_AX (MAX_BPF_REG + 1) +#define MAX_BPF_EXT_REG (MAX_BPF_REG + 2) #define MAX_BPF_JIT_REG MAX_BPF_EXT_REG /* unused opcode to mark special call to bpf_tail_call() helper */ |