[PATCH v2 net-next 2/3] x86: bpf_jit_comp: support BPF_S_ANC_SECCOMP_LD_W instruction

[Xi Wang]

This patch implements the seccomp BPF_S_ANC_SECCOMP_LD_W instruction
in x86 JIT.

Signed-off-by: Xi Wang <xi.wang@xxxxxxxxx>
Cc: Daniel Borkmann <dborkman@xxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Will Drewry <wad@xxxxxxxxxxxx>
Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: David Laight <david.laight@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Nicolas Schichan <nschichan@xxxxxxxxxx>
---
 arch/x86/net/bpf_jit_comp.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 8898680..5f1dafb 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -683,6 +683,17 @@ cond_branch:			f_offset = addrs[i + filter[i].jf] - addrs[i];
 				}
 				EMIT_COND_JMP(f_op, f_offset);
 				break;
+#ifdef CONFIG_SECCOMP_FILTER
+			case BPF_S_ANC_SECCOMP_LD_W:
+				func = (u8 *)seccomp_bpf_load;
+				t_offset = func - (image + addrs[i]);
+				/* seccomp filters don't use %rdi, %r8, %r9
+				 * it is safe to not save these registers
+				 */
+				EMIT1_off32(0xbf, K); /* mov imm32,%edi */
+				EMIT1_off32(0xe8, t_offset); /* call seccomp_bpf_load */
+				break;
+#endif
 			default:
 				/* hmm, too complex filter, give up with jit compiler */
 				goto out;
-- 
1.8.1.2

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