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| author | Ulrich Drepper <drepper@gmail.com> | 2011-09-06 00:12:18 -0400 |
|---|---|---|
| committer | Ulrich Drepper <drepper@gmail.com> | 2011-09-06 00:12:18 -0400 |
| commit | ef60624956e93df1da329a48570776ed963b1916 (patch) | |
| tree | 21743f4149f142ca1e4614e1f59c929573745024 /sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S | |
| parent | 6585cb60ee7aafc3301c402dda12d6771dfb7fa3 (diff) | |
| download | glibc-ef60624956e93df1da329a48570776ed963b1916.tar.gz glibc-ef60624956e93df1da329a48570776ed963b1916.tar.xz glibc-ef60624956e93df1da329a48570776ed963b1916.zip | |
Prefer real syscalls instead of vsyscalls on x86-64 outside libc.so
Diffstat (limited to 'sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S b/sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S index 8ec7d3fcd2..246c955042 100644 --- a/sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S +++ b/sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S @@ -20,6 +20,7 @@ #include <tls.h> #define _ERRNO_H 1 #include <bits/errno.h> +#include <kernel-features.h> /* For the calculation see asm/vsyscall.h. */ #define VSYSCALL_ADDR_vgetcpu 0xffffffffff600800 @@ -38,10 +39,26 @@ ENTRY (sched_getcpu) #ifdef SHARED movq __vdso_getcpu(%rip), %rax PTR_DEMANGLE (%rax) + callq *%rax #else +# ifdef __NR_getcpu + movl $__NR_getcpu, %eax + syscall +# ifndef __ASSUME_GETCPU_SYSCALL + cmpq $-ENOSYS, %rax + jne 1f +# endif +# endif +# ifndef __ASSUME_GETCPU_SYSCALL movq $VSYSCALL_ADDR_vgetcpu, %rax -#endif callq *%rax +1: +# else +# ifndef __NR_getcpu +# error "cannot happen" +# endif +# endif +#endif cmpq $-4095, %rax jae SYSCALL_ERROR_LABEL |