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author | Michael Ellerman <mpe@ellerman.id.au> | 2016-03-24 22:04:03 +1100 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-04-14 15:47:06 +1000 |
commit | f63e6d89876034c21ecd18bb1cd0d6c5b8da11a5 (patch) | |
tree | 2ee1ed2c10c82001f382c2a9b0d3fcf7911fa51c /arch | |
parent | 28e7cbd3e0f5fefec892842d1391ebd508fdb5ce (diff) | |
download | linux-stable-f63e6d89876034c21ecd18bb1cd0d6c5b8da11a5.tar.gz linux-stable-f63e6d89876034c21ecd18bb1cd0d6c5b8da11a5.tar.bz2 linux-stable-f63e6d89876034c21ecd18bb1cd0d6c5b8da11a5.zip |
powerpc/livepatch: Add livepatch header
Add the powerpc specific livepatch definitions. In particular we provide
a non-default implementation of klp_get_ftrace_location().
This is required because the location of the mcount call is not constant
when using -mprofile-kernel (which we always do for live patching).
Signed-off-by: Torsten Duwe <duwe@suse.de>
Signed-off-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/powerpc/include/asm/livepatch.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/livepatch.h b/arch/powerpc/include/asm/livepatch.h new file mode 100644 index 000000000000..ad36e8e34fa1 --- /dev/null +++ b/arch/powerpc/include/asm/livepatch.h @@ -0,0 +1,54 @@ +/* + * livepatch.h - powerpc-specific Kernel Live Patching Core + * + * Copyright (C) 2015-2016, SUSE, IBM Corp. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * 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 <http://www.gnu.org/licenses/>. + */ +#ifndef _ASM_POWERPC_LIVEPATCH_H +#define _ASM_POWERPC_LIVEPATCH_H + +#include <linux/module.h> +#include <linux/ftrace.h> + +#ifdef CONFIG_LIVEPATCH +static inline int klp_check_compiler_support(void) +{ + return 0; +} + +static inline int klp_write_module_reloc(struct module *mod, unsigned long + type, unsigned long loc, unsigned long value) +{ + /* This requires infrastructure changes; we need the loadinfos. */ + return -ENOSYS; +} + +static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip) +{ + regs->nip = ip; +} + +#define klp_get_ftrace_location klp_get_ftrace_location +static inline unsigned long klp_get_ftrace_location(unsigned long faddr) +{ + /* + * Live patch works only with -mprofile-kernel on PPC. In this case, + * the ftrace location is always within the first 16 bytes. + */ + return ftrace_location_range(faddr, faddr + 16); +} +#endif /* CONFIG_LIVEPATCH */ + +#endif /* _ASM_POWERPC_LIVEPATCH_H */ |