[PATCH 4/5] powerpc64/bpf: jit support for sign extended mov

[Artem Savkov]

Add jit support for sign extended mov. Tested using test_bpf module.

Signed-off-by: Artem Savkov <asav...@redhat.com>
---
 arch/powerpc/net/bpf_jit_comp64.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/net/bpf_jit_comp64.c 
b/arch/powerpc/net/bpf_jit_comp64.c
index b9f47398b311d..811775cfd3a1b 100644
--- a/arch/powerpc/net/bpf_jit_comp64.c
+++ b/arch/powerpc/net/bpf_jit_comp64.c
@@ -676,8 +676,14 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, 
u32 *fimage, struct code
                                /* special mov32 for zext */
                                EMIT(PPC_RAW_RLWINM(dst_reg, dst_reg, 0, 0, 
31));
                                break;
-                       }
-                       EMIT(PPC_RAW_MR(dst_reg, src_reg));
+                       } else if (off == 8) {
+                               EMIT(PPC_RAW_EXTSB(dst_reg, src_reg));
+                       } else if (off == 16) {
+                               EMIT(PPC_RAW_EXTSH(dst_reg, src_reg));
+                       } else if (off == 32) {
+                               EMIT(PPC_RAW_EXTSW(dst_reg, src_reg));
+                       } else if (dst_reg != src_reg)
+                               EMIT(PPC_RAW_MR(dst_reg, src_reg));
                        goto bpf_alu32_trunc;
                case BPF_ALU | BPF_MOV | BPF_K: /* (u32) dst = imm */
                case BPF_ALU64 | BPF_MOV | BPF_K: /* dst = (s64) imm */
-- 
2.45.0