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i386 vsyscall support (vdso-provided sysenter/syscall instruction based)

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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.
This commit is contained in:
Rich Felker
2012-10-11 22:47:07 -04:00
parent f2b1f1af83
commit 12e9b4faf6
4 changed files with 69 additions and 82 deletions
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3
src/env/__libc_start_main.c vendored
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@ -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);