bpf_jit_emit_probe_mem_store() is introduced to emit instructions for
storing memory values depending on the size (byte, halfword,
word, doubleword).
Signed-off-by: Saket Kumar Bhaskar <skb99@xxxxxxxxxxxxx>
---
arch/powerpc/net/bpf_jit_comp64.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c
index 025524378443..489de21fe3d6 100644
--- a/arch/powerpc/net/bpf_jit_comp64.c
+++ b/arch/powerpc/net/bpf_jit_comp64.c
@@ -409,6 +409,36 @@ asm (
" blr ;"
);
+static int bpf_jit_emit_probe_mem_store(struct codegen_context *ctx, u32 src_reg, s16 off,
+ u32 code, u32 *image)
+{
+ u32 tmp1_reg = bpf_to_ppc(TMP_REG_1);
+ u32 tmp2_reg = bpf_to_ppc(TMP_REG_2);
+
+ switch (BPF_SIZE(code)) {
+ case BPF_B:
+ EMIT(PPC_RAW_STB(src_reg, tmp1_reg, off));
+ break;
+ case BPF_H:
+ EMIT(PPC_RAW_STH(src_reg, tmp1_reg, off));
+ break;
+ case BPF_W:
+ EMIT(PPC_RAW_STW(src_reg, tmp1_reg, off));
+ break;
+ case BPF_DW:
+ if (off % 4) {
+ EMIT(PPC_RAW_LI(tmp2_reg, off));
+ EMIT(PPC_RAW_STDX(src_reg, tmp1_reg, tmp2_reg));
+ } else {
+ EMIT(PPC_RAW_STD(src_reg, tmp1_reg, off));
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
static int emit_atomic_ld_st(const struct bpf_insn insn, struct codegen_context *ctx, u32 *image)
{
u32 code = insn.code;
--
2.43.5
