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authorBrendan Jackman <jackmanb@google.com>2021-01-14 18:17:44 +0000
committerAlexei Starovoitov <ast@kernel.org>2021-01-14 18:34:29 -0800
commit91c960b0056672e74627776655c926388350fa30 (patch)
treeb15d68c17ead28b128791f8e710d9efa2a711267 /arch/sparc
parente5f02caccfae94f5baf6ec6dbb57ce8a7e9a40e7 (diff)
bpf: Rename BPF_XADD and prepare to encode other atomics in .imm
A subsequent patch will add additional atomic operations. These new operations will use the same opcode field as the existing XADD, with the immediate discriminating different operations. In preparation, rename the instruction mode BPF_ATOMIC and start calling the zero immediate BPF_ADD. This is possible (doesn't break existing valid BPF progs) because the immediate field is currently reserved MBZ and BPF_ADD is zero. All uses are removed from the tree but the BPF_XADD definition is kept around to avoid breaking builds for people including kernel headers. Signed-off-by: Brendan Jackman <jackmanb@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Björn Töpel <bjorn.topel@gmail.com> Link: https://lore.kernel.org/bpf/20210114181751.768687-5-jackmanb@google.com
Diffstat (limited to 'arch/sparc')
-rw-r--r--arch/sparc/net/bpf_jit_comp_64.c17
1 files changed, 14 insertions, 3 deletions
diff --git a/arch/sparc/net/bpf_jit_comp_64.c b/arch/sparc/net/bpf_jit_comp_64.c
index 3364e2a00989..4b8d3c65d266 100644
--- a/arch/sparc/net/bpf_jit_comp_64.c
+++ b/arch/sparc/net/bpf_jit_comp_64.c
@@ -1366,12 +1366,18 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
break;
}
- /* STX XADD: lock *(u32 *)(dst + off) += src */
- case BPF_STX | BPF_XADD | BPF_W: {
+ case BPF_STX | BPF_ATOMIC | BPF_W: {
const u8 tmp = bpf2sparc[TMP_REG_1];
const u8 tmp2 = bpf2sparc[TMP_REG_2];
const u8 tmp3 = bpf2sparc[TMP_REG_3];
+ if (insn->imm != BPF_ADD) {
+ pr_err_once("unknown atomic op %02x\n", insn->imm);
+ return -EINVAL;
+ }
+
+ /* lock *(u32 *)(dst + off) += src */
+
if (insn->dst_reg == BPF_REG_FP)
ctx->saw_frame_pointer = true;
@@ -1390,11 +1396,16 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
break;
}
/* STX XADD: lock *(u64 *)(dst + off) += src */
- case BPF_STX | BPF_XADD | BPF_DW: {
+ case BPF_STX | BPF_ATOMIC | BPF_DW: {
const u8 tmp = bpf2sparc[TMP_REG_1];
const u8 tmp2 = bpf2sparc[TMP_REG_2];
const u8 tmp3 = bpf2sparc[TMP_REG_3];
+ if (insn->imm != BPF_ADD) {
+ pr_err_once("unknown atomic op %02x\n", insn->imm);
+ return -EINVAL;
+ }
+
if (insn->dst_reg == BPF_REG_FP)
ctx->saw_frame_pointer = true;