Generalize vDSO code.

- Add macroses for vDSO functions names because
  in some architectures these names differ from the default ones.

- Add header guards in dl-syscalls.h .

Signed-off-by: Dmitry Chestnykh <dm.chestnykh@gmail.com>

ldso/ldso/arm/dl-syscalls.h

@@ -1,5 +1,8 @@
 /* stub for arch-specific syscall issues/specific implementations */
 
+#ifndef _DL_SYSCALLS_H
+#define _DL_SYSCALLS_H
+
 #if defined(__VDSO_SUPPORT__) && !defined(UCLIBC_LDSO)
 
 #include "../dl-vdso-calls.h"
@@ -19,4 +22,7 @@ static int __attribute__ ((used)) __arm_vdso_gettimeofday(struct timeval *tv, __
 #define ARCH_VDSO_GETTIMEOFDAY(tv, tz)        __arm_vdso_gettimeofday(tv, tz)
 #define ARCH_VDSO_CLOCK_GETTIME(clock_id, tp) __arm_vdso_clock_gettime(clock_id, tp)
 
-#endif /* defined(__VDSO_SUPPORT__) && !defined(UCLIBC_LDSO) */
+#endif /* defined(__VDSO_SUPPORT__) && !defined(UCLIBC_LDSO) */
+
+#endif /* _DL_SYSCALLS_H */
+

ldso/ldso/dl-vdso.c

@@ -3,6 +3,14 @@
 #include <string.h>
 #include "sys/auxv.h"
 
+#define __ARCH_VDSO_GETTIMEOFDAY_NAME    "__vdso_gettimeofday"
+#define __ARCH_VDSO_CLOCK_GETTIME_NAME   "__vdso_clock_gettime"
+
+#if defined(__UCLIBC_USE_TIME64__)
+#define __ARCH_VDSO_CLOCK_GETTIME64_NAME "__vdso_clock_gettime64"
+#endif
+
+/* Maybe override default vDSO functions names by arch-specific */
 #include "ldso.h"
 #include "generated/autoconf.h"
 
@@ -321,7 +329,7 @@ void load_vdso(void *sys_info_ehdr, char **envp ){
             continue;
         }
 
-        if ( 0 == _dl_strcmp( name, "__vdso_gettimeofday" ) ){
+        if ( 0 == _dl_strcmp( name, __ARCH_VDSO_GETTIMEOFDAY_NAME ) ){
             _dl__vdso_gettimeofday = func_addr;
 #ifdef __SUPPORT_LD_DEBUG__
             if ( _dl_debug_vdso != 0 ){
@@ -330,7 +338,7 @@ void load_vdso(void *sys_info_ehdr, char **envp ){
 #endif
             continue;
         }
-        if ( 0 == _dl_strcmp( name, "__vdso_clock_gettime" ) ){
+        if ( 0 == _dl_strcmp( name, __ARCH_VDSO_CLOCK_GETTIME_NAME ) ){
             _dl__vdso_clock_gettime = func_addr;
 #ifdef __SUPPORT_LD_DEBUG__
             if ( _dl_debug_vdso != 0 ){
@@ -341,7 +349,7 @@ void load_vdso(void *sys_info_ehdr, char **envp ){
         }
 
 #if defined(__UCLIBC_USE_TIME64__)
-        if ( 0 == _dl_strcmp( name, "__vdso_clock_gettime64" ) ){
+        if ( 0 == _dl_strcmp( name, __ARCH_VDSO_CLOCK_GETTIME64_NAME ) ){
             _dl__vdso_clock_gettime64 = func_addr;
 #ifdef __SUPPORT_LD_DEBUG__
             if ( _dl_debug_vdso != 0 ){

ldso/ldso/mips/dl-syscalls.h

@@ -1,5 +1,8 @@
 /* stub for arch-specific syscall issues/specific implementations */
 
+#ifndef _DL_SYSCALLS_H
+#define _DL_SYSCALLS_H
+
 #if defined(__VDSO_SUPPORT__) && !defined(UCLIBC_LDSO)
 
 #include "../dl-vdso-calls.h"
@@ -19,4 +22,7 @@ static int __attribute__ ((used)) __mips_vdso_gettimeofday(struct timeval *tv, _
 #define ARCH_VDSO_GETTIMEOFDAY(tv, tz)        __mips_vdso_gettimeofday(tv, tz)
 #define ARCH_VDSO_CLOCK_GETTIME(clock_id, tp) __mips_vdso_clock_gettime(clock_id, tp)
 
-#endif /* defined(__VDSO_SUPPORT__) && !defined(UCLIBC_LDSO) */
+#endif /* defined(__VDSO_SUPPORT__) && !defined(UCLIBC_LDSO) */
+
+#endif /* _DL_SYSCALLS_H */
+

ldso/ldso/x86_64/dl-syscalls.h

@@ -1,5 +1,8 @@
 /* stub for arch-specific syscall issues/specific implementations */
 
+#ifndef _DL_SYSCALLS_H
+#define _DL_SYSCALLS_H
+
 #if defined(__VDSO_SUPPORT__) && !defined(UCLIBC_LDSO)
 
 #include "../dl-vdso-calls.h"
@@ -19,4 +22,7 @@ static int __attribute__ ((used)) __x86_64_vdso_gettimeofday(struct timeval *tv,
 #define ARCH_VDSO_GETTIMEOFDAY(tv, tz)        __x86_64_vdso_gettimeofday(tv, tz)
 #define ARCH_VDSO_CLOCK_GETTIME(clock_id, tp) __x86_64_vdso_clock_gettime(clock_id, tp)
 
-#endif /* defined(__VDSO_SUPPORT__) && !defined(UCLIBC_LDSO) */
+#endif /* defined(__VDSO_SUPPORT__) && !defined(UCLIBC_LDSO) */
+
+#endif /* _DL_SYSCALLS_H */
+