Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
bpf, arm64: Factor out emit_a64_add_i()
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
authored by
Peilin Ye
and committed by
Daniel Borkmann
66bb58ac
0a580721
+14
-8
+14
-8
arch/arm64/net/bpf_jit_comp.c
+14
-8
arch/arm64/net/bpf_jit_comp.c
···
267
267
return !(imm & ~0xfff) || !(imm & ~0xfff000);
268
268
}
269
269
270
+
static inline void emit_a64_add_i(const bool is64, const int dst, const int src,
271
+
const int tmp, const s32 imm, struct jit_ctx *ctx)
272
+
{
273
+
if (is_addsub_imm(imm)) {
274
+
emit(A64_ADD_I(is64, dst, src, imm), ctx);
275
+
} else if (is_addsub_imm(-imm)) {
276
+
emit(A64_SUB_I(is64, dst, src, -imm), ctx);
277
+
} else {
278
+
emit_a64_mov_i(is64, tmp, imm, ctx);
279
+
emit(A64_ADD(is64, dst, src, tmp), ctx);
280
+
}
281
+
}
282
+
270
283
/*
271
284
* There are 3 types of AArch64 LDR/STR (immediate) instruction:
272
285
* Post-index, Pre-index, Unsigned offset.
···
1157
1144
/* dst = dst OP imm */
1158
1145
case BPF_ALU | BPF_ADD | BPF_K:
1159
1146
case BPF_ALU64 | BPF_ADD | BPF_K:
1160
-
if (is_addsub_imm(imm)) {
1161
-
emit(A64_ADD_I(is64, dst, dst, imm), ctx);
1162
-
} else if (is_addsub_imm(-imm)) {
1163
-
emit(A64_SUB_I(is64, dst, dst, -imm), ctx);
1164
-
} else {
1165
-
emit_a64_mov_i(is64, tmp, imm, ctx);
1166
-
emit(A64_ADD(is64, dst, dst, tmp), ctx);
1167
-
}
1147
+
emit_a64_add_i(is64, dst, dst, tmp, imm, ctx);
1168
1148
break;
1169
1149
case BPF_ALU | BPF_SUB | BPF_K:
1170
1150
case BPF_ALU64 | BPF_SUB | BPF_K: