From: Naveen N. Rao Date: Mon, 14 Feb 2022 10:41:39 +0000 (+0530) Subject: powerpc64/bpf: Use r12 for constant blinding X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=1d4866d5652f7a19dcbed0c4e366c3402c7775b7;p=linux.git powerpc64/bpf: Use r12 for constant blinding In preparation for preserving kernel toc in r2, switch BPF_REG_AX from r2 to r12. r12 is not used by bpf JIT except during external helper/bpf calls, or with BPF_NOSPEC. These sequences aren't emitted when BPF_REG_AX is used for constant blinding and other purposes. Signed-off-by: Naveen N. Rao Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/e109f98617eacb4512c17a48525e94eda42889e6.1644834730.git.naveen.n.rao@linux.vnet.ibm.com --- diff --git a/arch/powerpc/net/bpf_jit64.h b/arch/powerpc/net/bpf_jit64.h index b63b35e45e558..82cdfee412784 100644 --- a/arch/powerpc/net/bpf_jit64.h +++ b/arch/powerpc/net/bpf_jit64.h @@ -56,7 +56,7 @@ const int b2p[MAX_BPF_JIT_REG + 2] = { /* frame pointer aka BPF_REG_10 */ [BPF_REG_FP] = 31, /* eBPF jit internal registers */ - [BPF_REG_AX] = 2, + [BPF_REG_AX] = 12, [TMP_REG_1] = 9, [TMP_REG_2] = 10 };