diff options
Diffstat (limited to 'libc/sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S')
| -rw-r--r-- | libc/sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/libc/sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S b/libc/sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S index 8ec7d3fcd..246c95504 100644 --- a/libc/sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S +++ b/libc/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 |