From c6c33339b45281590f9db138ba6c9d79acb1da27 Mon Sep 17 00:00:00 2001 From: Evan Green Date: Tue, 27 Feb 2024 14:56:38 -0800 Subject: [PATCH] linux: Introduce INTERNAL_VSYSCALL Add an INTERNAL_VSYSCALL() macro that makes a vDSO call, falling back to a regular syscall, but without setting errno. Instead, the return value is plumbed straight out of the macro. Signed-off-by: Evan Green Signed-off-by: Palmer Dabbelt --- sysdeps/unix/sysv/linux/sysdep-vdso.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/sysdeps/unix/sysv/linux/sysdep-vdso.h b/sysdeps/unix/sysv/linux/sysdep-vdso.h index 189319ad98..2f53ada6e5 100644 --- a/sysdeps/unix/sysv/linux/sysdep-vdso.h +++ b/sysdeps/unix/sysv/linux/sysdep-vdso.h @@ -53,4 +53,16 @@ sc_ret; \ }) +#define INTERNAL_VSYSCALL(name, nr, args...) \ + ({ \ + long int sc_ret = -ENOSYS; \ + \ + __typeof (GLRO(dl_vdso_##name)) vdsop = GLRO(dl_vdso_##name); \ + if (vdsop != NULL) \ + sc_ret = INTERNAL_VSYSCALL_CALL (vdsop, nr, ##args); \ + if (sc_ret == -ENOSYS) \ + sc_ret = INTERNAL_SYSCALL_CALL (name, ##args); \ + sc_ret; \ + }) + #endif /* SYSDEP_VDSO_LINUX_H */ -- 2.11.4.GIT