public-mirrors/linux
1
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-09-18 22:14:16 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

bpf, arm64: Factor out emit_a64_add_i()

Browse source 
As suggested by Xu, factor out emit_a64_add_i() for later use. No
functional change.

Suggested-by: Xu Kuohai <xukuohai@huaweicloud.com>
Signed-off-by: Peilin Ye <yepeilin@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Xu Kuohai <xukuohai@huawei.com>
Link: https://lore.kernel.org/bpf/fedbaca80e6d8bd5bcba1ac5320dfbbdab14472e.1735868489.git.yepeilin@google.com
This commit is contained in:
Peilin Ye 2025-01-03 02:03:42 +00:00 • committed by Daniel Borkmann
parent 0a5807219a
commit 66bb58ac06
1 changed files with 14 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

22
arch/arm64/net/bpf_jit_comp.c
View file

@ -267,6 +267,19 @@ static bool is_addsub_imm(u32 imm)
return !(imm & ~0xfff) || !(imm & ~0xfff000);
}
static inline void emit_a64_add_i(const bool is64, const int dst, const int src,
const int tmp, const s32 imm, struct jit_ctx *ctx)
{
if (is_addsub_imm(imm)) {
emit(A64_ADD_I(is64, dst, src, imm), ctx);
} else if (is_addsub_imm(-imm)) {
emit(A64_SUB_I(is64, dst, src, -imm), ctx);
} else {
emit_a64_mov_i(is64, tmp, imm, ctx);
emit(A64_ADD(is64, dst, src, tmp), ctx);
}
}
/*
* There are 3 types of AArch64 LDR/STR (immediate) instruction:
* Post-index, Pre-index, Unsigned offset.
@ -1144,14 +1157,7 @@ emit_bswap_uxt:
/* dst = dst OP imm */
case BPF_ALU | BPF_ADD | BPF_K:
case BPF_ALU64 | BPF_ADD | BPF_K:
if (is_addsub_imm(imm)) {
emit(A64_ADD_I(is64, dst, dst, imm), ctx);
} else if (is_addsub_imm(-imm)) {
emit(A64_SUB_I(is64, dst, dst, -imm), ctx);
} else {
emit_a64_mov_i(is64, tmp, imm, ctx);
emit(A64_ADD(is64, dst, dst, tmp), ctx);
}
emit_a64_add_i(is64, dst, dst, tmp, imm, ctx);
break;
case BPF_ALU | BPF_SUB | BPF_K:
case BPF_ALU64 | BPF_SUB | BPF_K: