diff options
Diffstat (limited to 'arch/x86/entry/vdso/vdso32/system_call.S')
| -rw-r--r-- | arch/x86/entry/vdso/vdso32/system_call.S | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/entry/vdso/vdso32/system_call.S b/arch/x86/entry/vdso/vdso32/system_call.S index d591fe93e93a..00157cae71e0 100644 --- a/arch/x86/entry/vdso/vdso32/system_call.S +++ b/arch/x86/entry/vdso/vdso32/system_call.S @@ -3,6 +3,8 @@ */ #include <asm/dwarf2.h> +#include <asm/cpufeature.h> +#include <asm/alternative-asm.h> /* * First get the common code for the sigreturn entry points. @@ -28,6 +30,12 @@ __kernel_vsyscall: CFI_REL_OFFSET ecx, 0 movl %esp, %ecx +#ifdef CONFIG_X86_64 + /* If SYSENTER (Intel) or SYSCALL32 (AMD) is available, use it. */ + ALTERNATIVE_2 "", "sysenter", X86_FEATURE_SYSENTER32, \ + "syscall", X86_FEATURE_SYSCALL32 +#endif + /* Enter using int $0x80 */ movl (%esp), %ecx int $0x80 |