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authorRich Felker <dalias@aerifal.cx>2012-10-11 22:47:07 -0400
committerRich Felker <dalias@aerifal.cx>2012-10-11 22:47:07 -0400
commit12e9b4faf68a1a02ebf5ad69c03ac10f170f14cb (patch)
treef206db332e670791be0120cb21cc5eee9bc23574 /src/env
parentf2b1f1af83e96f8f98fbf2a5c663d8d058f2a66d (diff)
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i386 vsyscall support (vdso-provided sysenter/syscall instruction based)
this doubles the performance of the fastest syscalls on the atom I
tested it on; improvement is reportedly much more dramatic on
worst-case cpus. cannot be used for cancellable syscalls.
Diffstat (limited to 'src/env')
-rw-r--r--src/env/__libc_start_main.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/env/__libc_start_main.c b/src/env/__libc_start_main.c
index e350fdb8..ee10b0de 100644
--- a/src/env/__libc_start_main.c
+++ b/src/env/__libc_start_main.c
@@ -6,6 +6,8 @@ void __init_security(size_t *);
 
 #define AUX_CNT 38
 
+extern size_t __hwcap, __sysinfo;
+
 void __init_libc(char **envp)
 {
 	size_t i, *auxv, aux[AUX_CNT] = { 0 };
@@ -14,6 +16,7 @@ void __init_libc(char **envp)
 	libc.auxv = auxv = (void *)(envp+i+1);
 	for (i=0; auxv[i]; i+=2) if (auxv[i]<AUX_CNT) aux[auxv[i]] = auxv[i+1];
 	__hwcap = aux[AT_HWCAP];
+	__sysinfo = aux[AT_SYSINFO];
 
 	__init_tls(aux);
 	__init_security(aux);