Patch-Source: https://sources.debian.org/data/main/libs/libsys-syscall-perl/0.25-7/debian/patches/aarch64.patch

From 6c7c516edfabd2edc835d0aaad39f946164bb25d Mon Sep 17 00:00:00 2001
From: Yaakov Selkowitz <yselkowi@redhat.com>
Date: Fri, 4 Dec 2015 02:31:28 -0600
Subject: [PATCH 3/3] Add aarch64 support

This is a bit complicated because AArch64, as a completely new architecture,
does not support the deprecated epoll_create and epoll_wait syscalls.
Instead, these wrap the epoll_create1 and epoll_pwait syscalls, which serve
the same purpose but with slightly different syntaxes.

Origin: backport, https://github.com/bradfitz/sys-syscall/commit/6c7c516edfabd2edc835d0aaad39f946164bb25d
Bug-Debian: https://bugs.debian.org/824843
---
 lib/Sys/Syscall.pm | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/lib/Sys/Syscall.pm b/lib/Sys/Syscall.pm
index 702e835..abd010a 100644
--- a/lib/Sys/Syscall.pm
+++ b/lib/Sys/Syscall.pm
@@ -53,6 +53,8 @@ our (
      $SYS_readahead,
      );
 
+our $no_deprecated = 0;
+
 if ($^O eq "linux") {
     # whether the machine requires 64-bit numbers to be on 8-byte
     # boundaries.
@@ -105,6 +107,14 @@ if ($^O eq "linux") {
         $SYS_epoll_wait   = 409;
         $SYS_readahead    = 379;
         $u64_mod_8        = 1;
+    } elsif ($machine eq "aarch64") {
+        $SYS_epoll_create = 20;  # (sys_epoll_create1)
+        $SYS_epoll_ctl    = 21;
+        $SYS_epoll_wait   = 22;  # (sys_epoll_pwait)
+        $SYS_sendfile     = 71;  # (sys_sendfile64)
+        $SYS_readahead    = 213;
+        $u64_mod_8        = 1;
+        $no_deprecated    = 1;
     } elsif ($machine =~ m/arm(v\d+)?.*l/) {
         # ARM OABI
         $SYS_epoll_create = 250;
@@ -207,7 +217,7 @@ sub epoll_defined { return $SYS_epoll_create ? 1 : 0; }
 # size doesn't even matter (radix tree now, not hash)
 sub epoll_create {
     return -1 unless defined $SYS_epoll_create;
-    my $epfd = eval { syscall($SYS_epoll_create, ($_[0]||100)+0) };
+    my $epfd = eval { syscall($SYS_epoll_create, $no_deprecated ? 0 : ($_[0]||100)+0) };
     return -1 if $@;
     return $epfd;
 }
@@ -245,7 +255,12 @@ sub epoll_wait_mod8 {
         $epoll_wait_size = $_[1];
         $epoll_wait_events = "\0" x 16 x $epoll_wait_size;
     }
-    my $ct = syscall($SYS_epoll_wait, $_[0]+0, $epoll_wait_events, $_[1]+0, $_[2]+0);
+    my $ct;
+    if ($no_deprecated) {
+        $ct = syscall($SYS_epoll_wait, $_[0]+0, $epoll_wait_events, $_[1]+0, $_[2]+0, undef);
+    } else {
+        $ct = syscall($SYS_epoll_wait, $_[0]+0, $epoll_wait_events, $_[1]+0, $_[2]+0);
+    }
     for (0..$ct-1) {
         # 16 byte epoll_event structs, with format:
         #    4 byte mask [idx 1]
-- 
2.8.1