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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5d31a96e6c
In order to support live patching we need to maintain an alternate stack of TOC & LR values. We use the base of the stack for this, and store the "live patch stack pointer" in struct thread_info. Unlike the other fields of thread_info, we can not statically initialise that value, so it must be done at run time. This patch just adds the code to support that, it is not enabled until the next patch which actually adds live patch support. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Acked-by: Balbir Singh <bsingharora@gmail.com>
63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
/*
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* livepatch.h - powerpc-specific Kernel Live Patching Core
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*
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* Copyright (C) 2015-2016, SUSE, IBM Corp.
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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_POWERPC_LIVEPATCH_H
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#define _ASM_POWERPC_LIVEPATCH_H
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#include <linux/module.h>
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#include <linux/ftrace.h>
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#ifdef CONFIG_LIVEPATCH
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static inline int klp_check_compiler_support(void)
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{
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return 0;
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}
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static inline int klp_write_module_reloc(struct module *mod, unsigned long
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type, unsigned long loc, unsigned long value)
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{
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/* This requires infrastructure changes; we need the loadinfos. */
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return -ENOSYS;
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}
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static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
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{
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regs->nip = ip;
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}
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#define klp_get_ftrace_location klp_get_ftrace_location
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static inline unsigned long klp_get_ftrace_location(unsigned long faddr)
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{
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/*
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* Live patch works only with -mprofile-kernel on PPC. In this case,
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* the ftrace location is always within the first 16 bytes.
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*/
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return ftrace_location_range(faddr, faddr + 16);
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}
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static inline void klp_init_thread_info(struct thread_info *ti)
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{
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/* + 1 to account for STACK_END_MAGIC */
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ti->livepatch_sp = (unsigned long *)(ti + 1) + 1;
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}
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#else
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static void klp_init_thread_info(struct thread_info *ti) { }
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#endif /* CONFIG_LIVEPATCH */
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#endif /* _ASM_POWERPC_LIVEPATCH_H */
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