Revision be0f272bfc83797f70d44faca86954df62e2bbc0 authored by Ard Biesheuvel on 20 November 2017, 17:41:30 UTC, committed by Will Deacon on 01 December 2017, 13:04:59 UTC
When building the arm64 kernel with both CONFIG_ARM64_MODULE_PLTS and CONFIG_DYNAMIC_FTRACE enabled, the ftrace-mod.o object file is built with the kernel and contains a trampoline that is linked into each module, so that modules can be loaded far away from the kernel and still reach the ftrace entry point in the core kernel with an ordinary relative branch, as is emitted by the compiler instrumentation code dynamic ftrace relies on. In order to be able to build out of tree modules, this object file needs to be included into the linux-headers or linux-devel packages, which is undesirable, as it makes arm64 a special case (although a precedent does exist for 32-bit PPC). Given that the trampoline essentially consists of a PLT entry, let's not bother with a source or object file for it, and simply patch it in whenever the trampoline is being populated, using the existing PLT support routines. Cc: <stable@vger.kernel.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
1 parent 7e8b9c1
genksyms.h
/* Generate kernel symbol version hashes.
Copyright 1996, 1997 Linux International.
New implementation contributed by Richard Henderson <rth@tamu.edu>
Based on original work by Bjorn Ekwall <bj0rn@blox.se>
This file is part of the Linux modutils.
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, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifndef MODUTILS_GENKSYMS_H
#define MODUTILS_GENKSYMS_H 1
#include <stdio.h>
enum symbol_type {
SYM_NORMAL, SYM_TYPEDEF, SYM_ENUM, SYM_STRUCT, SYM_UNION,
SYM_ENUM_CONST
};
enum symbol_status {
STATUS_UNCHANGED, STATUS_DEFINED, STATUS_MODIFIED
};
struct string_list {
struct string_list *next;
enum symbol_type tag;
int in_source_file;
char *string;
};
struct symbol {
struct symbol *hash_next;
const char *name;
enum symbol_type type;
struct string_list *defn;
struct symbol *expansion_trail;
struct symbol *visited;
int is_extern;
int is_declared;
enum symbol_status status;
int is_override;
};
typedef struct string_list **yystype;
#define YYSTYPE yystype
extern int cur_line;
extern char *cur_filename, *source_file;
extern int in_source_file;
struct symbol *find_symbol(const char *name, enum symbol_type ns, int exact);
struct symbol *add_symbol(const char *name, enum symbol_type type,
struct string_list *defn, int is_extern);
void export_symbol(const char *);
void free_node(struct string_list *list);
void free_list(struct string_list *s, struct string_list *e);
struct string_list *copy_node(struct string_list *);
struct string_list *copy_list_range(struct string_list *start,
struct string_list *end);
int yylex(void);
int yyparse(void);
void error_with_pos(const char *, ...) __attribute__ ((format(printf, 1, 2)));
/*----------------------------------------------------------------------*/
#define xmalloc(size) ({ void *__ptr = malloc(size); \
if(!__ptr && size != 0) { \
fprintf(stderr, "out of memory\n"); \
exit(1); \
} \
__ptr; })
#define xstrdup(str) ({ char *__str = strdup(str); \
if (!__str) { \
fprintf(stderr, "out of memory\n"); \
exit(1); \
} \
__str; })
#endif /* genksyms.h */
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