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Mark hooked functions as visibility(("protected")).

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Simon Ruderich
2013-06-15 03:36:50 +02:00
parent ca12529c8f
commit a58d1a9017
2 changed files with 18 additions and 0 deletions
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9
src/compiler.h
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@@ -26,10 +26,19 @@
# define always_inline __attribute__((always_inline))
/* Unused parameter. */
# define unused __attribute__((unused))
/* Mark the function protected, which means it can't be overwritten by other
* modules (libraries), e.g. with LD_PRELOAD); otherwise same as the default
* visibility. This causes the compiler not use the PLT (and no relocations)
* for local calls from inside this module; but the symbols are still
* exported. This is faster and in this case prevents useless lookups as we
* hook those functions and nobody else should modify them. Not strictly
* necessary, but nice to have. */
# define visibility_protected __attribute__((visibility("protected")))
#else
# define noinline
# define always_inline
# define unused
# define visibility_protected
#endif
/* Branch prediction information for the compiler. */

9
src/hookmacros.h
View File

@@ -103,29 +103,38 @@
#define HOOK_FUNC_DEF1(type, name, type1, arg1) \
static type (*real_ ## name)(type1); \
type name(type1) visibility_protected; \
type name(type1 arg1)
#define HOOK_FUNC_DEF2(type, name, type1, arg1, type2, arg2) \
static type (*real_ ## name)(type1, type2); \
type name(type1, type2) visibility_protected; \
type name(type1 arg1, type2 arg2)
#define HOOK_FUNC_DEF3(type, name, type1, arg1, type2, arg2, type3, arg3) \
static type (*real_ ## name)(type1, type2, type3); \
type name(type1, type2, type3) visibility_protected; \
type name(type1 arg1, type2 arg2, type3 arg3)
#define HOOK_FUNC_DEF4(type, name, type1, arg1, type2, arg2, type3, arg3, type4, arg4) \
static type (*real_ ## name)(type1, type2, type3, type4); \
type name(type1, type2, type3, type4) visibility_protected; \
type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4)
#define HOOK_FUNC_VAR_DEF2(type, name, type1, arg1, type2, arg2) \
static type (*real_ ## name)(type1, type2, ...); \
type name(type1, type2, ...) visibility_protected; \
type name(type1 arg1, type2 arg2, ...)
#define HOOK_FUNC_SIMPLE3(type, name, type1, arg1, type2, arg2, type3, arg3) \
type name(type1, type2, type3) visibility_protected; \
type name(type1 arg1, type2 arg2, type3 arg3)
#define HOOK_FUNC_VAR_SIMPLE1(type, name, type1, arg1) \
type name(type1, ...) visibility_protected; \
type name(type1 arg1, ...)
#define HOOK_FUNC_VAR_SIMPLE2(type, name, type1, arg1, type2, arg2) \
type name(type1, type2, ...) visibility_protected; \
type name(type1 arg1, type2 arg2, ...)
#define HOOK_FUNC_VAR_SIMPLE3(type, name, type1, arg1, type2, arg2, type3, arg3) \
type name(type1, type2, type3, ...) visibility_protected; \
type name(type1 arg1, type2 arg2, type3 arg3, ...)
#define HOOK_VOID1(type, name, fd, type1, arg1) \