68 lines
2.4 KiB
C
68 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2014-2023, Huawei.
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* Author: Li Bin <huawei.libin@huawei.com>
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* Author: Cheng Jian <cj.chengjian@huawei.com>
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* Author: laokz <zhangkai@iscas.ac.cn>
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*
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* livepatch.h - riscv64-specific Kernel Live Patching Core
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _ASM_RISCV64_LIVEPATCH_H
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#define _ASM_RISCV64_LIVEPATCH_H
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#include <linux/module.h>
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#include <linux/livepatch.h>
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#include <asm/cacheflush.h>
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/*
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* For arbitrary kernel address(PC offset might over/underflow +-2G), we
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* need store the new address and then use at least 3 instructors to jump
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* to. And with the alignment, we need 6 u32 space. Here C extension can't
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* help because it lacks scratch registers.
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* 0. 0x00000f97 // auipc t6,0x0
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* 1. 0x010fbf83 // ld t6,16(t6) # t6 --> 4,5 new_addr
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* 2. 0x000f8067 // jr t6
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* 3. not used
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* 4,5. new_addr
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*/
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#define LJMP_INSN_SIZE 6
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struct arch_klp_data {
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u32 old_insns[LJMP_INSN_SIZE];
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/*
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* Saved opcode at the entry of the old func (which maybe replaced
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* with breakpoint).
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*/
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u32 saved_opcode;
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};
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#define KLP_MAX_REPLACE_SIZE sizeof_field(struct arch_klp_data, old_insns)
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struct klp_func;
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#define klp_smp_isb() local_flush_icache_all()
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int arch_klp_patch_func(struct klp_func *func);
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void arch_klp_unpatch_func(struct klp_func *func);
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long arch_klp_save_old_code(struct arch_klp_data *arch_data, void *old_func);
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bool arch_check_jump_insn(unsigned long func_addr);
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int arch_klp_check_calltrace(bool (*check_func)(void *, int *, unsigned long), void *data);
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int arch_klp_add_breakpoint(struct arch_klp_data *arch_data, void *old_func);
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void arch_klp_remove_breakpoint(struct arch_klp_data *arch_data, void *old_func);
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int arch_klp_module_check_calltrace(void *data);
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bool arch_klp_skip_resolve(unsigned int type);
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#endif /* _ASM_RISCV64_LIVEPATCH_H */
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