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authorSiddhesh Poyarekar <siddhesh@sourceware.org>2017-05-31 06:38:32 +0530
committerSiddhesh Poyarekar <siddhesh@sourceware.org>2017-05-31 06:38:33 +0530
commit4158ba082c641f407009363b186b4c85f8a01a35 (patch)
treefcce87f0eaeed4b2c2e76f68fcc41a73f2c63b29 /sysdeps
parent2e0bbbfbf95fc9e22692e93658a6fbdd2d4554da (diff)
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Delay initialization of CPU features struct in static binaries
Allow the CPU features structure set up to be overridden by tunables by delaying it to until after tunables are initialized. The initialization is already delayed in dynamically linked glibc, it is only in static binaries that the initialization is set early to allow it to influence IFUNC relocations that happen in libc-start. It is a bit too early however and there is a good place between tunables initialization and IFUNC relocations where this can be done. Verified that this does not regress the testsuite. * csu/libc-start.c [!ARCH_INIT_CPU_FEATURES]: Define ARCH_INIT_CPU_FEATURES. (LIBC_START_MAIN): Call it. * sysdeps/unix/sysv/linux/aarch64/libc-start.c (__libc_start_main): Remove. (ARCH_INIT_CPU_FEATURES): New macro. * sysdeps/x86/libc-start.c (__libc_start_main): Remove. (ARCH_INIT_CPU_FEATURES): New macro.
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/unix/sysv/linux/aarch64/libc-start.c23
-rw-r--r--sysdeps/x86/libc-start.c23
2 files changed, 10 insertions, 36 deletions
diff --git a/sysdeps/unix/sysv/linux/aarch64/libc-start.c b/sysdeps/unix/sysv/linux/aarch64/libc-start.c
index a5babd4..089a728 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libc-start.c
+++ b/sysdeps/unix/sysv/linux/aarch64/libc-start.c
@@ -16,26 +16,13 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
-#ifdef SHARED
-# include <csu/libc-start.c>
-# else
-/* The main work is done in the generic function. */
-# define LIBC_START_DISABLE_INLINE
-# define LIBC_START_MAIN generic_start_main
-# include <csu/libc-start.c>
+#ifndef SHARED
+# include <ldsodefs.h>
# include <cpu-features.c>
extern struct cpu_features _dl_aarch64_cpu_features;
-int
-__libc_start_main (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
- int argc, char **argv,
- __typeof (main) init,
- void (*fini) (void),
- void (*rtld_fini) (void), void *stack_end)
-{
- init_cpu_features (&_dl_aarch64_cpu_features);
- return generic_start_main (main, argc, argv, init, fini, rtld_fini,
- stack_end);
-}
+# define ARCH_INIT_CPU_FEATURES() init_cpu_features (&_dl_aarch64_cpu_features)
+
#endif
+#include <csu/libc-start.c>
diff --git a/sysdeps/x86/libc-start.c b/sysdeps/x86/libc-start.c
index 9a56adc..e11b490 100644
--- a/sysdeps/x86/libc-start.c
+++ b/sysdeps/x86/libc-start.c
@@ -15,27 +15,14 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
-#ifdef SHARED
-# include <csu/libc-start.c>
-# else
-/* The main work is done in the generic function. */
-# define LIBC_START_DISABLE_INLINE
-# define LIBC_START_MAIN generic_start_main
-# include <csu/libc-start.c>
+#ifndef SHARED
+#include <ldsodefs.h>
# include <cpu-features.h>
# include <cpu-features.c>
extern struct cpu_features _dl_x86_cpu_features;
-int
-__libc_start_main (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
- int argc, char **argv,
- __typeof (main) init,
- void (*fini) (void),
- void (*rtld_fini) (void), void *stack_end)
-{
- init_cpu_features (&_dl_x86_cpu_features);
- return generic_start_main (main, argc, argv, init, fini, rtld_fini,
- stack_end);
-}
+#define ARCH_INIT_CPU_FEATURES() init_cpu_features (&_dl_x86_cpu_features)
+
#endif
+# include <csu/libc-start.c>