From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- arch/arm64/kernel/jump_label.c | 49 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 arch/arm64/kernel/jump_label.c (limited to 'arch/arm64/kernel/jump_label.c') diff --git a/arch/arm64/kernel/jump_label.c b/arch/arm64/kernel/jump_label.c new file mode 100644 index 000000000..b90754aeb --- /dev/null +++ b/arch/arm64/kernel/jump_label.c @@ -0,0 +1,49 @@ +/* + * Copyright (C) 2013 Huawei Ltd. + * Author: Jiang Liu + * + * Based on arch/arm/kernel/jump_label.c + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ +#include +#include +#include + +void arch_jump_label_transform(struct jump_entry *entry, + enum jump_label_type type) +{ + void *addr = (void *)entry->code; + u32 insn; + + if (type == JUMP_LABEL_JMP) { + insn = aarch64_insn_gen_branch_imm(entry->code, + entry->target, + AARCH64_INSN_BRANCH_NOLINK); + } else { + insn = aarch64_insn_gen_nop(); + } + + aarch64_insn_patch_text_nosync(addr, insn); +} + +void arch_jump_label_transform_static(struct jump_entry *entry, + enum jump_label_type type) +{ + /* + * We use the architected A64 NOP in arch_static_branch, so there's no + * need to patch an identical A64 NOP over the top of it here. The core + * will call arch_jump_label_transform from a module notifier if the + * NOP needs to be replaced by a branch. + */ +} -- cgit v1.2.3