diff options
Diffstat (limited to 'arch/x86/vdso/vdso32/sysenter.S')
| -rw-r--r-- | arch/x86/vdso/vdso32/sysenter.S | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/arch/x86/vdso/vdso32/sysenter.S b/arch/x86/vdso/vdso32/sysenter.S index 109bfa394eaa..902d5fc11f1b 100644 --- a/arch/x86/vdso/vdso32/sysenter.S +++ b/arch/x86/vdso/vdso32/sysenter.S @@ -1,11 +1,10 @@ /* - * Code for the vsyscall page. This version uses the sysenter instruction. + * Code for the vDSO. This version uses the sysenter instruction. * - * NOTE: - * 1) __kernel_vsyscall _must_ be first in this page. - * 2) there are alignment constraints on this stub, see vsyscall-sigreturn.S - * for details. + * First get the common code for the sigreturn entry points. + * This must come first. */ +#include "sigreturn.S" /* * The caller puts arg2 in %ecx, which gets pushed. The kernel will use @@ -23,11 +22,12 @@ * arg6 from the stack. * * You can not use this vsyscall for the clone() syscall because the - * three dwords on the parent stack do not get copied to the child. + * three words on the parent stack do not get copied to the child. */ .text .globl __kernel_vsyscall .type __kernel_vsyscall,@function + ALIGN __kernel_vsyscall: .LSTART_vsyscall: push %ecx @@ -115,7 +115,8 @@ VDSO32_SYSENTER_RETURN: /* Symbol used by sysenter.c via vdso32-syms.h */ .LENDFDEDLSI: .previous -/* - * Get the common code for the sigreturn entry points. - */ -#include "sigreturn.S" + /* + * Emit a symbol with the size of this .eh_frame data, + * to verify it matches the other versions. + */ +VDSO32_vsyscall_eh_frame_size = (.LENDFDEDLSI-.LSTARTFRAMEDLSI) |