GCC port for eBPF

This patch series introduces a port of GCC to eBPF, which is a virtual
machine that resides in the Linux kernel.  Initially intended for
user-level packet capture and filtering, eBPF is nowadays generalized
to serve as a general-purpose infrastructure also for non-networking
purposes.

The binutils support is already upstream.  See
https://sourceware.org/ml/binutils/2019-05/msg00306.html.

ChangeLog:

	* MAINTAINERS: Add myself as the maintainer of the eBPF port.
	Remove myself from Write After Approval section.
	* configure.ac: Support for bpf-*-* targets.
	* configure: Regenerate.

contrib/ChangeLog:

	* config-list.mk (LIST): Disable go in bpf-*-* targets.

gcc/ChangeLog:

	* doc/invoke.texi (Option Summary): Cover eBPF.
	(eBPF Options): New section.
	* doc/extend.texi (BPF Built-in Functions): Likewise.
	(BPF Kernel Helpers): Likewise.
	* config.gcc: Support for bpf-*-* targets.
	* common/config/bpf/bpf-common.c: New file.
	* config/bpf/t-bpf: Likewise.
	* config/bpf/predicates.md: Likewise.
	* config/bpf/constraints.md: Likewise.
	* config/bpf/bpf.opt: Likewise.
	* config/bpf/bpf.md: Likewise.
	* config/bpf/bpf.h: Likewise.
	* config/bpf/bpf.c: Likewise.
	* config/bpf/bpf-protos.h: Likewise.
	* config/bpf/bpf-opts.h: Likewise.
	* config/bpf/bpf-helpers.h: Likewise.
	* config/bpf/bpf-helpers.def: Likewise.

gcc/testsuite/ChangeLog:

	* gcc.dg/builtins-config.h: eBPF doesn't support C99 standard
	functions.
	* gcc.c-torture/compile/20101217-1.c: Add a function prototype for
	printf.
	* gcc.c-torture/compile/20000211-1.c: Skip if target bpf-*-*.
	* gcc.c-torture/compile/poor.c: Likewise.
	* gcc.c-torture/compile/pr25311.c: Likewise.
	* gcc.c-torture/compile/pr39928-1.c: Likewise.
	* gcc.c-torture/compile/pr70061.c: Likewise.
	* gcc.c-torture/compile/920501-7.c: Likewise.
	* gcc.c-torture/compile/20000403-1.c: Likewise.
	* gcc.c-torture/compile/20001226-1.c: Likewise.
	* gcc.c-torture/compile/20030903-1.c: Likewise.
	* gcc.c-torture/compile/20031125-1.c: Likewise.
	* gcc.c-torture/compile/20040101-1.c: Likewise.
	* gcc.c-torture/compile/20040317-2.c: Likewise.
	* gcc.c-torture/compile/20040726-1.c: Likewise.
	* gcc.c-torture/compile/20051216-1.c: Likewise.
	* gcc.c-torture/compile/900313-1.c: Likewise.
	* gcc.c-torture/compile/920625-1.c: Likewise.
	* gcc.c-torture/compile/930421-1.c: Likewise.
	* gcc.c-torture/compile/930623-1.c: Likewise.
	* gcc.c-torture/compile/961004-1.c: Likewise.
	* gcc.c-torture/compile/980504-1.c: Likewise.
	* gcc.c-torture/compile/980816-1.c: Likewise.
	* gcc.c-torture/compile/990625-1.c: Likewise.
	* gcc.c-torture/compile/DFcmp.c: Likewise.
	* gcc.c-torture/compile/HIcmp.c: Likewise.
	* gcc.c-torture/compile/HIset.c: Likewise.
	* gcc.c-torture/compile/QIcmp.c: Likewise.
	* gcc.c-torture/compile/QIset.c: Likewise.
	* gcc.c-torture/compile/SFset.c: Likewise.
	* gcc.c-torture/compile/SIcmp.c: Likewise.
	* gcc.c-torture/compile/SIset.c: Likewise.
	* gcc.c-torture/compile/UHIcmp.c: Likewise.
	* gcc.c-torture/compile/UQIcmp.c: Likewise.
	* gcc.c-torture/compile/USIcmp.c: Likewise.
	* gcc.c-torture/compile/consec.c: Likewise.
	* gcc.c-torture/compile/limits-fndefn.c: Likewise.
	* gcc.c-torture/compile/lll.c: Likewise.
	* gcc.c-torture/compile/parms.c: Likewise.
	* gcc.c-torture/compile/pass.c: Likewise.
	* gcc.c-torture/compile/pp.c: Likewise.
	* gcc.c-torture/compile/pr32399.c: Likewise.
	* gcc.c-torture/compile/pr34091.c: Likewise.
	* gcc.c-torture/compile/pr34688.c: Likewise.
	* gcc.c-torture/compile/pr37258.c: Likewise.
	* gcc.c-torture/compile/pr37327.c: Likewise.
	* gcc.c-torture/compile/pr37381.c: Likewise.
	* gcc.c-torture/compile/pr37669-2.c: Likewise.
	* gcc.c-torture/compile/pr37669.c: Likewise.
	* gcc.c-torture/compile/pr37742-3.c: Likewise.
	* gcc.c-torture/compile/pr44063.c: Likewise.
	* gcc.c-torture/compile/pr48596.c: Likewise.
	* gcc.c-torture/compile/pr51856.c: Likewise.
	* gcc.c-torture/compile/pr54428.c: Likewise.
	* gcc.c-torture/compile/pr54713-1.c: Likewise.
	* gcc.c-torture/compile/pr54713-2.c: Likewise.
	* gcc.c-torture/compile/pr54713-3.c: Likewise.
	* gcc.c-torture/compile/pr55921.c: Likewise.
	* gcc.c-torture/compile/pr70240.c: Likewise.
	* gcc.c-torture/compile/pr70355.c: Likewise.
	* gcc.c-torture/compile/pr82052.c: Likewise.
	* gcc.c-torture/compile/pr83487.c: Likewise.
	* gcc.c-torture/compile/pr86122.c: Likewise.
	* gcc.c-torture/compile/pret-arg.c: Likewise.
	* gcc.c-torture/compile/regs-arg-size.c: Likewise.
	* gcc.c-torture/compile/structret.c: Likewise.
	* gcc.c-torture/compile/uuarg.c: Likewise.
	* gcc.dg/20001009-1.c: Likewise.
	* gcc.dg/20020418-1.c: Likewise.
	* gcc.dg/20020426-2.c: Likewise.
	* gcc.dg/20020430-1.c: Likewise.
	* gcc.dg/20040306-1.c: Likewise.
	* gcc.dg/20040622-2.c: Likewise.
	* gcc.dg/20050603-2.c: Likewise.
	* gcc.dg/20050629-1.c: Likewise.
	* gcc.dg/20061026.c: Likewise.
	* gcc.dg/Warray-bounds-3.c: Likewise.
	* gcc.dg/Warray-bounds-30.c: Likewise.
	* gcc.dg/Wframe-larger-than-2.c: Likewise.
	* gcc.dg/Wframe-larger-than.c: Likewise.
	* gcc.dg/Wrestrict-11.c: Likewise.
	* gcc.c-torture/compile/20000804-1.c: Likewise.
	* lib/target-supports.exp (check_effective_target_trampolines):
	Adapt to eBPF.
	(check_effective_target_indirect_jumps): Likewise.
	(check_effective_target_nonlocal_goto): Likewise.
	(check_effective_target_global_constructor): Likewise.
	(check_effective_target_return_address): Likewise.
	* gcc.target/bpf/bpf.exp: New file.
	* gcc.target/bpf/builtin-load.c: Likewise.
	* cc.target/bpf/constant-calls.c: Likewise.
	* gcc.target/bpf/diag-funargs.c: Likewise.
	* gcc.target/bpf/diag-funargs-2.c: Likewise.
	* gcc.target/bpf/diag-funargs-3.c: Likewise.
	* gcc.target/bpf/diag-indcalls.c: Likewise.
	* gcc.target/bpf/helper-bind.c: Likewise.
	* gcc.target/bpf/helper-bpf-redirect.c: Likewise.
	* gcc.target/bpf/helper-clone-redirect.c: Likewise.
	* gcc.target/bpf/helper-csum-diff.c: Likewise.
	* gcc.target/bpf/helper-csum-update.c: Likewise.
	* gcc.target/bpf/helper-current-task-under-cgroup.c: Likewise.
	* gcc.target/bpf/helper-fib-lookup.c: Likewise.
	* gcc.target/bpf/helper-get-cgroup-classid.c: Likewise.
	* gcc.target/bpf/helper-get-current-cgroup-id.c: Likewise.
	* gcc.target/bpf/helper-get-current-comm.c: Likewise.
	* gcc.target/bpf/helper-get-current-pid-tgid.c: Likewise.
	* gcc.target/bpf/helper-get-current-task.c: Likewise.
	* gcc.target/bpf/helper-get-current-uid-gid.c: Likewise.
	* gcc.target/bpf/helper-get-hash-recalc.c: Likewise.
	* gcc.target/bpf/helper-get-listener-sock.c: Likewise.
	* gcc.target/bpf/helper-get-local-storage.c: Likewise.
	* gcc.target/bpf/helper-get-numa-node-id.c: Likewise.
	* gcc.target/bpf/helper-get-prandom-u32.c: Likewise.
	* gcc.target/bpf/helper-get-route-realm.c: Likewise.
	* gcc.target/bpf/helper-get-smp-processor-id.c: Likewise.
	* gcc.target/bpf/helper-get-socket-cookie.c: Likewise.
	* gcc.target/bpf/helper-get-socket-uid.c: Likewise.
	* gcc.target/bpf/helper-getsockopt.c: Likewise.
	* gcc.target/bpf/helper-get-stack.c: Likewise.
	* gcc.target/bpf/helper-get-stackid.c: Likewise.
	* gcc.target/bpf/helper-ktime-get-ns.c: Likewise.
	* gcc.target/bpf/helper-l3-csum-replace.c: Likewise.
	* gcc.target/bpf/helper-l4-csum-replace.c: Likewise.
	* gcc.target/bpf/helper-lwt-push-encap.c: Likewise.
	* gcc.target/bpf/helper-lwt-seg6-action.c: Likewise.
	* gcc.target/bpf/helper-lwt-seg6-adjust-srh.c: Likewise.
	* gcc.target/bpf/helper-lwt-seg6-store-bytes.c: Likewise.
	* gcc.target/bpf/helper-map-delete-elem.c: Likewise.
	* gcc.target/bpf/helper-map-lookup-elem.c: Likewise.
	* gcc.target/bpf/helper-map-peek-elem.c: Likewise.
	* gcc.target/bpf/helper-map-pop-elem.c: Likewise.
	* gcc.target/bpf/helper-map-push-elem.c: Likewise.
	* gcc.target/bpf/helper-map-update-elem.c: Likewise.
	* gcc.target/bpf/helper-msg-apply-bytes.c: Likewise.
	* gcc.target/bpf/helper-msg-cork-bytes.c: Likewise.
	* gcc.target/bpf/helper-msg-pop-data.c: Likewise.
	* gcc.target/bpf/helper-msg-pull-data.c: Likewise.
	* gcc.target/bpf/helper-msg-push-data.c: Likewise.
	* gcc.target/bpf/helper-msg-redirect-hash.c: Likewise.
	* gcc.target/bpf/helper-msg-redirect-map.c: Likewise.
	* gcc.target/bpf/helper-override-return.c: Likewise.
	* gcc.target/bpf/helper-perf-event-output.c: Likewise.
	* gcc.target/bpf/helper-perf-event-read.c: Likewise.
	* gcc.target/bpf/helper-perf-event-read-value.c: Likewise.
	* gcc.target/bpf/helper-perf-prog-read-value.c: Likewise.
	* gcc.target/bpf/helper-probe-read.c: Likewise.
	* gcc.target/bpf/helper-probe-read-str.c: Likewise.
	* gcc.target/bpf/helper-probe-write-user.c: Likewise.
	* gcc.target/bpf/helper-rc-keydown.c: Likewise.
	* gcc.target/bpf/helper-rc-pointer-rel.c: Likewise.
	* gcc.target/bpf/helper-rc-repeat.c: Likewise.
	* gcc.target/bpf/helper-redirect-map.c: Likewise.
	* gcc.target/bpf/helper-set-hash.c: Likewise.
	* gcc.target/bpf/helper-set-hash-invalid.c: Likewise.
	* gcc.target/bpf/helper-setsockopt.c: Likewise.
	* gcc.target/bpf/helper-skb-adjust-room.c: Likewise.
	* gcc.target/bpf/helper-skb-cgroup-id.c: Likewise.
	* gcc.target/bpf/helper-skb-change-head.c: Likewise.
	* gcc.target/bpf/helper-skb-change-proto.c: Likewise.
	* gcc.target/bpf/helper-skb-change-tail.c: Likewise.
	* gcc.target/bpf/helper-skb-change-type.c: Likewise.
	* gcc.target/bpf/helper-skb-ecn-set-ce.c: Likewise.
	* gcc.target/bpf/helper-skb-get-tunnel-key.c: Likewise.
	* gcc.target/bpf/helper-skb-get-tunnel-opt.c: Likewise.
	* gcc.target/bpf/helper-skb-get-xfrm-state.c: Likewise.
	* gcc.target/bpf/helper-skb-load-bytes.c: Likewise.
	* gcc.target/bpf/helper-skb-load-bytes-relative.c: Likewise.
	* gcc.target/bpf/helper-skb-pull-data.c: Likewise.
	* gcc.target/bpf/helper-skb-set-tunnel-key.c: Likewise.
	* gcc.target/bpf/helper-skb-set-tunnel-opt.c: Likewise.
	* gcc.target/bpf/helper-skb-store-bytes.c: Likewise.
	* gcc.target/bpf/helper-skb-under-cgroup.c: Likewise.
	* gcc.target/bpf/helper-skb-vlan-pop.c: Likewise.
	* gcc.target/bpf/helper-skb-vlan-push.c: Likewise.
	* gcc.target/bpf/helper-skc-lookup-tcp.c: Likewise.
	* gcc.target/bpf/helper-sk-fullsock.c: Likewise.
	* gcc.target/bpf/helper-sk-lookup-tcp.c: Likewise.
	* gcc.target/bpf/helper-sk-lookup-upd.c: Likewise.
	* gcc.target/bpf/helper-sk-redirect-hash.c: Likewise.
	* gcc.target/bpf/helper-sk-redirect-map.c: Likewise.
	* gcc.target/bpf/helper-sk-release.c: Likewise.
	* gcc.target/bpf/helper-sk-select-reuseport.c: Likewise.
	* gcc.target/bpf/helper-sk-storage-delete.c: Likewise.
	* gcc.target/bpf/helper-sk-storage-get.c: Likewise.
	* gcc.target/bpf/helper-sock-hash-update.c: Likewise.
	* gcc.target/bpf/helper-sock-map-update.c: Likewise.
	* gcc.target/bpf/helper-sock-ops-cb-flags-set.c: Likewise.
	* gcc.target/bpf/helper-spin-lock.c: Likewise.
	* gcc.target/bpf/helper-spin-unlock.c: Likewise.
	* gcc.target/bpf/helper-strtol.c: Likewise.
	* gcc.target/bpf/helper-strtoul.c: Likewise.
	* gcc.target/bpf/helper-sysctl-get-current-value.c: Likewise.
	* gcc.target/bpf/helper-sysctl-get-name.c: Likewise.
	* gcc.target/bpf/helper-sysctl-get-new-value.c: Likewise.
	* gcc.target/bpf/helper-sysctl-set-new-value.c: Likewise.
	* gcc.target/bpf/helper-tail-call.c: Likewise.
	* gcc.target/bpf/helper-tcp-check-syncookie.c: Likewise.
	* gcc.target/bpf/helper-tcp-sock.c: Likewise.
	* gcc.target/bpf/helper-trace-printk.c: Likewise.
	* gcc.target/bpf/helper-xdp-adjust-head.c: Likewise.
	* gcc.target/bpf/helper-xdp-adjust-meta.c: Likewise.
	* gcc.target/bpf/helper-xdp-adjust-tail.c: Likewise.
	* gcc.target/bpf/skb-ancestor-cgroup-id.c: Likewise.
	* gcc.target/bpf/sync-fetch-and-add.c: Likewise.

libgcc/ChangeLog:

	* config.host: Set cpu_type for bpf-*-* targets.
	* config/bpf/t-bpf: Likewise.
	* config/bpf/crtn.S: Likewise.
	* config/bpf/crti.S: New file.

From-SVN: r275506

11 files changed, 2813 insertions, 0 deletions

diff --git a/gcc/config/bpf/bpf-helpers.def b/gcc/config/bpf/bpf-helpers.def
new file mode 100644
index 0000000..cd06402
--- /dev/null
+++ b/gcc/config/bpf/bpf-helpers.def
@@ -0,0 +1,194 @@
+/* Kernel helpers database.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+/* This file contains the definition of the kernel helpers that are
+   available to eBPF programs.
+
+   The primary source for information on kernel helpers is the
+   linux/include/uapi/linux/bpf.h file in the Linux source tree.
+   Please keep this database in sync.
+
+   The first column is the first kernel version featuring the helper
+   function.  This should be an enumerate from bpf_kernel_version,
+   defined in bpf-opts.h.  Note that the backend assumes that helpers
+   never get deprecated in the kernel.  If that eventually happens,
+   then we will need to use a bitmask here instead of an enumerate.
+
+   The second column is the constant-name for the helper.
+   The third column is the program-name of the helper.
+
+   The fourth column is a list of names describing the types of the
+   values returned and accepted by the helper, in one of these forms:
+
+     TYPES (type1, type2, ..., 0)
+     VTYPES (type1, type2, ..., 0)
+
+   VTYPES should be used should the helper accept a variable number of
+   arguments, TYPES otherwise.  The valid type names are:
+
+     `vt' for void.
+     `it' for signed int.
+     `ut' for unsigned int.
+     `pt' for void*.
+     `cpt' for const void*.
+     `st' for short int.
+     `ust' for unsigned short int.
+     `cst' for const char *.
+     `ullt' for unsigned long long.
+     `llt' for long long.
+     `u32t' for uint32.
+     `u64t' for uint64.
+  
+   In types descriptions, the firt entry corresponds to the value
+   returned by the helper.  Subsequent names correspond to the helper
+   arguments.  Finally, a 0 should close the list.
+
+   VERY IMPORTANT: the helper entries should be listed in the same
+   order than in the definition of __BPF_FUNC_MAPPER in
+   linux/include/uapi/linux/bpf.h!  */
+
+DEF_HELPER (LINUX_V4_0, MAP_LOOKUP_ELEM, map_lookup_elem, TYPES (pt, pt, pt, 0))
+DEF_HELPER (LINUX_V4_0, MAP_UPDATE_ELEM, map_update_elem, TYPES (it, pt, pt, pt, ullt, 0))
+DEF_HELPER (LINUX_V4_0, MAP_DELETE_ELEM, map_delete_elem, TYPES (it, pt, pt, 0))
+DEF_HELPER (LINUX_V4_1, PROBE_READ, probe_read, TYPES (it, pt, ut, cpt, 0))
+DEF_HELPER (LINUX_V4_1, KTIME_GET_NS, ktime_get_ns, TYPES (ullt, 0))
+DEF_HELPER (LINUX_V4_1, TRACE_PRINTK, trace_printk, VTYPES (it, cst, it, 0))
+DEF_HELPER (LINUX_V4_1, GET_PRANDOM_U32, get_prandom_u32, TYPES (ullt, 0))
+DEF_HELPER (LINUX_V4_1, GET_SMP_PROCESSOR_ID, get_smp_processor_id, TYPES (ullt, 0))
+DEF_HELPER (LINUX_V4_1, SKB_STORE_BYTES, skb_store_bytes, TYPES (it, pt, it, pt, it, it, 0))
+DEF_HELPER (LINUX_V4_1, L3_CSUM_REPLACE, l3_csum_replace, TYPES (it, pt, it, it ,it ,it, 0))
+DEF_HELPER (LINUX_V4_1, L4_CSUM_REPLACE, l4_csum_replace, TYPES (it, pt, it, it, it, it, 0))
+DEF_HELPER (LINUX_V4_2, TAIL_CALL, tail_call, TYPES (vt, pt, pt, it, 0))
+DEF_HELPER (LINUX_V4_2, CLONE_REDIRECT, clone_redirect, TYPES (it, pt, it, it, 0))
+DEF_HELPER (LINUX_V4_2, GET_CURRENT_PID_TGID, get_current_pid_tgid, TYPES (ullt, 0))
+DEF_HELPER (LINUX_V4_2, GET_CURRENT_UID_GID, get_current_uid_gid, TYPES (ullt, 0))
+DEF_HELPER (LINUX_V4_2, GET_CURRENT_COMM, get_current_comm, TYPES (it, pt, it, 0))
+DEF_HELPER (LINUX_V4_3, GET_CGROUP_CLASSID, get_cgroup_classid, TYPES (it, pt, 0))
+DEF_HELPER (LINUX_V4_3, SKB_VLAN_PUSH, skb_vlan_push, TYPES (it, pt, st, ust, 0))
+DEF_HELPER (LINUX_V4_3, SKB_VLAN_POP, skb_vlan_pop, TYPES (it, pt, 0))
+DEF_HELPER (LINUX_V4_3, SKB_GET_TUNNEL_KEY, skb_get_tunnel_key, TYPES (it, pt, pt, it, it, 0))
+DEF_HELPER (LINUX_V4_3, SKB_SET_TUNNEL_KEY, skb_set_tunnel_key, TYPES (it, pt, pt, it, it, 0))
+DEF_HELPER (LINUX_V4_3, PERF_EVENT_READ, perf_event_read, TYPES (ullt, pt, ullt, 0))
+DEF_HELPER (LINUX_V4_4, REDIRECT, redirect, TYPES (it, it, it, 0))
+DEF_HELPER (LINUX_V4_4, GET_ROUTE_REALM, get_route_realm, TYPES (ut, pt, 0))
+DEF_HELPER (LINUX_V4_4, PERF_EVENT_OUTPUT, perf_event_output, \
+	    TYPES (it, pt, pt, ullt, pt, it, 0))
+DEF_HELPER (LINUX_V4_5, SKB_LOAD_BYTES, skb_load_bytes, TYPES (it, pt, it, pt, it, 0))
+DEF_HELPER (LINUX_V4_6, GET_STACKID, get_stackid, TYPES (it, pt, pt, it, 0))
+DEF_HELPER (LINUX_V4_6, CSUM_DIFF, csum_diff, TYPES (it, pt, it, pt, it, it, 0))
+DEF_HELPER (LINUX_V4_6, SKB_GET_TUNNEL_OPT, skb_get_tunnel_opt, TYPES (it, pt, pt, it, 0))
+DEF_HELPER (LINUX_V4_6, SKB_SET_TUNNEL_OPT, skb_set_tunnel_opt, TYPES (it, pt, pt, it, 0))
+DEF_HELPER (LINUX_V4_8, SKB_CHANGE_PROTO, skb_change_proto, TYPES (it, pt, st, u64t, 0))
+DEF_HELPER (LINUX_V4_8, SKB_CHANGE_TYPE, skb_change_type, TYPES (it, pt, u32t, 0))
+DEF_HELPER (LINUX_V4_8, SKB_UNDER_CGROUP, skb_under_cgroup, TYPES (it, pt, pt, it, 0))
+DEF_HELPER (LINUX_V4_8, GET_HASH_RECALC, get_hash_recalc, TYPES (ut, pt, 0))
+DEF_HELPER (LINUX_V4_8, GET_CURRENT_TASK, get_current_task, TYPES (ullt, 0))
+DEF_HELPER (LINUX_V4_8, PROBE_WRITE_USER, probe_write_user, TYPES (it, pt, cpt, ut, 0))
+DEF_HELPER (LINUX_V4_9, CURRENT_TASK_UNDER_CGROUP, current_task_under_cgroup, \
+	    TYPES (it, pt, it, 0))
+DEF_HELPER (LINUX_V4_9, SKB_CHANGE_TAIL, skb_change_tail, TYPES (it, pt, ut, u64t, 0))
+DEF_HELPER (LINUX_V4_9, SKB_PULL_DATA, skb_pull_data, TYPES (it, pt, it, 0))
+DEF_HELPER (LINUX_V4_9, CSUM_UPDATE, csum_update, TYPES (llt, pt, u32t, 0))
+DEF_HELPER (LINUX_V4_9, SET_HASH_INVALID, set_hash_invalid, TYPES (vt, pt, 0))
+DEF_HELPER (LINUX_V4_10, GET_NUMA_NODE_ID, get_numa_node_id, TYPES (it, 0))
+DEF_HELPER (LINUX_V4_10, SKB_CHANGE_HEAD, skb_change_head, TYPES (it, pt, it, it, 0))
+DEF_HELPER (LINUX_V4_10, XDP_ADJUST_HEAD, xdp_adjust_head, TYPES (it, pt, it, 0))
+DEF_HELPER (LINUX_V4_11, PROBE_READ_STR, probe_read_str, TYPES (it, pt, u32t, cpt, 0))
+DEF_HELPER (LINUX_V4_12, GET_SOCKET_COOKIE, get_socket_cookie, TYPES (it, pt, 0))
+DEF_HELPER (LINUX_V4_12, GET_SOCKET_UID, get_socket_uid, TYPES (ut, pt, 0))
+DEF_HELPER (LINUX_V4_13, SET_HASH, set_hash, TYPES (ut, pt, u32t, 0))
+DEF_HELPER (LINUX_V4_13, SETSOCKOPT, setsockopt, TYPES (it, pt, it, it, pt, it, 0))
+DEF_HELPER (LINUX_V4_13, SKB_ADJUST_ROOM, skb_adjust_room, TYPES (it, pt, st, u32t, ullt, 0))
+DEF_HELPER (LINUX_V4_14, REDIRECT_MAP, redirect_map, TYPES (it, pt, it, it, 0))
+DEF_HELPER (LINUX_V4_14, SK_REDIRECT_MAP, sk_redirect_map, TYPES (it, pt, pt, it, it, 0))
+DEF_HELPER (LINUX_V4_14, SOCK_MAP_UPDATE, sock_map_update, TYPES (it, pt, pt, pt, ullt, 0))
+DEF_HELPER (LINUX_V4_15, XDP_ADJUST_META, xdp_adjust_meta, TYPES (it, pt, it, 0))
+DEF_HELPER (LINUX_V4_15, PERF_EVENT_READ_VALUE, perf_event_read_value,
+	    TYPES (it, pt, ullt, pt, ut, 0))
+DEF_HELPER (LINUX_V4_15, PERF_PROG_READ_VALUE, perf_prog_read_value,
+	    TYPES (it, pt, pt, ut, 0))
+DEF_HELPER (LINUX_V4_15, GETSOCKOPT, getsockopt, TYPES (it, pt, it, it, pt, it, 0))
+
+DEF_HELPER (LINUX_V4_16, OVERRIDE_RETURN, override_return, TYPES (it, pt, ult, 0))
+DEF_HELPER (LINUX_V4_16, SOCK_OPS_CB_FLAGS_SET, sock_ops_cb_flags_set, TYPES (it, pt, it, 0))
+DEF_HELPER (LINUX_V4_17, MSG_REDIRECT_MAP, msg_redirect_map, TYPES (it, pt, pt, it, it, 0))
+DEF_HELPER (LINUX_V4_17, MSG_APPLY_BYTES, msg_apply_bytes, TYPES (it, pt, it, 0))
+DEF_HELPER (LINUX_V4_17, MSG_CORK_BYTES, msg_cork_bytes, TYPES (it, pt, it, 0))
+DEF_HELPER (LINUX_V4_17, MSG_PULL_DATA, msg_pull_data, TYPES (it, pt, it, it, it, 0))
+DEF_HELPER (LINUX_V4_17, BIND, bind, TYPES (it, pt, pt, it, 0))
+DEF_HELPER (LINUX_V4_18, XDP_ADJUST_TAIL, xdp_adjust_tail, TYPES (it, pt, it, 0))
+DEF_HELPER (LINUX_V4_18, SKB_GET_XFRM_STATE,
+	    skb_get_xfrm_state, TYPES (it, pt, it, pt, it, it, 0))
+DEF_HELPER (LINUX_V4_18, GET_STACK, get_stack, TYPES (it, pt, pt, it, it, 0))
+DEF_HELPER (LINUX_V4_18, SKB_LOAD_BYTES_RELATIVE, skb_load_bytes_relative,
+	    TYPES (it, pt, it, pt, it, ut, 0))
+DEF_HELPER (LINUX_V4_18, FIB_LOOKUP, fib_lookup, TYPES (it, pt, pt, it, ut, 0))
+DEF_HELPER (LINUX_V4_18, SOCK_HASH_UPDATE, sock_hash_update, TYPES (it, pt, pt, pt, ullt, 0))
+DEF_HELPER (LINUX_V4_18, MSG_REDIRECT_HASH, msg_redirect_hash, TYPES (it, pt, pt, pt, it, 0))
+DEF_HELPER (LINUX_V4_18, SK_REDIRECT_HASH, sk_redirect_hash, TYPES (it, pt, pt, pt, it, 0))
+DEF_HELPER (LINUX_V4_18, LWT_PUSH_ENCAP, lwt_push_encap, TYPES (it, pt, ut, pt, ut, 0))
+DEF_HELPER (LINUX_V4_18, LWT_SEG6_STORE_BYTES, lwt_seg6_store_bytes,
+	    TYPES (it, pt, ut, pt, ut, 0))
+DEF_HELPER (LINUX_V4_18, LWT_SEG6_ADJUST_SRH, lwt_seg6_adjust_srh, TYPES (it, pt, ut, ut, 0))
+DEF_HELPER (LINUX_V4_18, LWT_SEG6_ACTION, lwt_seg6_action, TYPES (it, pt, ut, pt, ut, 0))
+DEF_HELPER (LINUX_V4_18, RC_REPEAT, rc_repeat, TYPES (it, pt, 0))
+DEF_HELPER (LINUX_V4_18, RC_KEYDOWN, rc_keydown, TYPES (it, pt, ut, ullt, ut, 0))
+DEF_HELPER (LINUX_V4_18, SKB_CGROUP_ID, skb_cgroup_id, TYPES (ullt, pt, 0))
+DEF_HELPER (LINUX_V4_18, GET_CURRENT_CGROUP_ID, get_current_cgroup_id, TYPES (ullt, 0))
+DEF_HELPER (LINUX_V4_19, GET_LOCAL_STORAGE, get_local_storage, TYPES (pt, pt, ullt, 0))
+DEF_HELPER (LINUX_V4_19, SK_SELECT_REUSEPORT, sk_select_reuseport,
+	    TYPES (it, pt, pt, pt, ut, 0))
+DEF_HELPER (LINUX_V4_19, SKB_ANCESTOR_CGROUP_ID, skb_ancestor_cgroup_id,
+	    TYPES (ullt, pt, it, 0))
+DEF_HELPER (LINUX_V4_20, SK_LOOKUP_TCP, sk_lookup_tcp, TYPES (pt, pt, pt, it, ullt, ullt, 0))
+DEF_HELPER (LINUX_V4_20, SK_LOOKUP_UDP, sk_lookup_udp, TYPES (pt, pt, pt, it, ullt, ullt, 0))
+DEF_HELPER (LINUX_V4_20, SK_RELEASE, sk_release, TYPES (it, pt, 0))
+DEF_HELPER (LINUX_V4_20, MAP_PUSH_ELEM, map_push_elem, TYPES (it, pt, pt, ullt, 0))
+DEF_HELPER (LINUX_V4_20, MAP_POP_ELEM, map_pop_elem, TYPES (it, pt, pt, 0))
+DEF_HELPER (LINUX_V4_20, MAP_PEEK_ELEM, map_peek_elem, TYPES (it, pt, pt, 0))
+DEF_HELPER (LINUX_V4_20, MSG_PUSH_DATA, msg_push_data, TYPES (it, pt, it, it, it, 0))
+DEF_HELPER (LINUX_V5_0, MSG_POP_DATA, msg_pop_data, TYPES (it, pt, it, it, it, 0))
+DEF_HELPER (LINUX_V5_0, RC_POINTER_REL, rc_pointer_rel, TYPES (it, pt, it, it, 0))
+DEF_HELPER (LINUX_V5_1, SPIN_LOCK, spin_lock, TYPES (vt, pt, 0))
+DEF_HELPER (LINUX_V5_1, SPIN_UNLOCK, spin_unlock, TYPES (vt, pt, 0))
+DEF_HELPER (LINUX_V5_1, SK_FULLSOCK, sk_fullsock, TYPES (pt, pt, 0))
+DEF_HELPER (LINUX_V5_1, TCP_SOCK, tcp_sock, TYPES (pt, pt, 0))
+DEF_HELPER (LINUX_V5_1, SKB_ECN_SET_CE, skb_ecn_set_ce, TYPES (it, pt, 0))
+DEF_HELPER (LINUX_V5_1, GET_LISTENER_SOCK, get_listener_sock, TYPES (pt, pt, 0))
+DEF_HELPER (LINUX_V5_2, SKC_LOOKUP_TCP, skc_lookup_tcp,
+	    TYPES (pt, pt, pt, u32t, u64t, u64t, 0))
+DEF_HELPER (LINUX_V5_2, TCP_CHECK_SYNCOOKIE, tcp_check_syncookie,
+	    TYPES (it, pt, pt, u32t, pt, u32t, 0))
+DEF_HELPER (LINUX_V5_2, SYSCTL_GET_NAME, sysctl_get_name, TYPES (it, pt, pt, ullt, u64t, 0))
+DEF_HELPER (LINUX_V5_2, SYSCTL_GET_CURRENT_VALUE, sysctl_get_current_value,
+	    TYPES (it, pt, pt, ullt, 0))
+DEF_HELPER (LINUX_V5_2, SYSCTL_GET_NEW_VALUE, sysctl_get_new_value,
+	    TYPES (it, pt, pt, ullt, 0))
+DEF_HELPER (LINUX_V5_2, SYSCTL_SET_NEW_VALUE, sysctl_set_new_value,
+	    TYPES (it, pt, pt, ullt, 0))
+DEF_HELPER (LINUX_V5_2, STRTOL, strtol, TYPES (it, cst, ullt, u64t, pt, 0))
+DEF_HELPER (LINUX_V5_2, STRTOUL, strtoul, TYPES (it, pt, ullt, u64t, pt, 0))
+DEF_HELPER (LINUX_V5_2, SK_STORAGE_GET, sk_storage_get, TYPES (pt, pt, pt, pt, u64t, 0))
+DEF_HELPER (LINUX_V5_2, SK_STORAGE_DELETE, sk_storage_delete, TYPES (it, pt, pt, 0))
+
+/*
+Local variables:
+mode:c
+End:
+*/
diff --git a/gcc/config/bpf/bpf-helpers.h b/gcc/config/bpf/bpf-helpers.h
new file mode 100644
index 0000000..1427543
--- /dev/null
+++ b/gcc/config/bpf/bpf-helpers.h
@@ -0,0 +1,327 @@
+/* Copyright (C) 2019 Free Software Foundation, Inc.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   GCC is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* The purpose of this file is to provide a compatiblity layer with
+   the Linux kernel bpf_helpers.h header that is located in
+   linux/tools/testing/selftests/bpf/bpf_helpers.h.  That file is
+   currently llvm-specific.  */
+
+#ifndef __BPF_HELPERS_H
+#define __BPF_HELPERS_H
+
+#define SEC(NAME) __attribute__((section(NAME), used))
+
+/* Flags used in some kernel helpers.  */
+
+#define BPF_ANY     0
+#define BPF_NOEXIST 1
+#define BPF_EXIST   2
+
+#define BPF_F_LOCK 4
+#define BPF_F_NO_COMMON_LRU (1U << 1)
+#define BPF_F_NUMA_NODE (1U << 2)
+
+/* Functions to call kernel helpers.  We provide the "standard" bpf_*
+   names as synonyms of the corresponding GCC builtins.  In some
+   cases, where non-void pointers are passed to the helper, inline
+   functions are used to achieve proper type checking.  */
+
+#ifndef KERNEL_VERSION
+# define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
+#endif
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,0,0)
+
+#define bpf_map_lookup_elem	__builtin_bpf_helper_map_lookup_elem
+#define bpf_map_update_elem	__builtin_bpf_helper_map_update_elem
+#define bpf_map_delete_elem	__builtin_bpf_helper_map_delete_elem
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,1,0)
+
+#define bpf_probe_read		__builtin_bpf_helper_probe_read
+#define bpf_ktime_get_ns	__builtin_bpf_helper_ktime_get_ns
+#define bpf_trace_printk	__builtin_bpf_helper_trace_printk
+#define bpf_get_prandom_u32	__builtin_bpf_helper_get_prandom_u32
+#define bpf_get_smp_processor_id __builtin_bpf_helper_get_smp_processor_id
+#define bpf_skb_store_bytes	__builtin_bpf_helper_skb_store_bytes
+#define bpf_l3_csum_replace	__builtin_bpf_helper_l3_csum_replace
+#define bpf_l4_csum_replace	__builtin_bpf_helper_l4_csum_replace
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,2,0)
+
+#define bpf_tail_call		__builtin_bpf_helper_tail_call
+#define bpf_clone_redirect	__builtin_bpf_helper_clone_redirect
+#define bpf_get_current_pid_tgid __builtin_bpf_helper_get_current_pid_tgid
+#define bpf_get_current_uid_gid  __builtin_bpf_helper_get_current_uid_gid
+#define bpf_get_current_comm	__builtin_bpf_helper_get_current_comm
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,3,0)
+
+#define bpf_get_cgroup_classid	__builtin_bpf_helper_get_cgroup_classid
+#define bpf_skb_vlan_push	__builtin_bpf_helper_skb_vlan_push
+#define bpf_skb_vlan_pop	__builtin_bpf_helper_skb_vlan_pop
+#define bpf_skb_get_tunnel_key	__builtin_bpf_helper_skb_get_tunnel_key
+#define bpf_skb_set_tunnel_key	__builtin_bpf_helper_skb_set_tunnel_key
+#define bpf_perf_event_read	__builtin_bpf_helper_perf_event_read
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,4,0)
+
+#define bpf_redirect		__builtin_bpf_helper_redirect
+#define bpf_get_route_realm	__builtin_bpf_helper_get_route_realm
+#define bpf_perf_event_output	__builtin_bpf_helper_perf_event_output
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,5,0)
+
+#define bpf_skb_load_bytes	__builtin_bpf_helper_skb_load_bytes
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,6,0)
+
+#define bpf_get_stackid		__builtin_bpf_helper_get_stackid
+#define bpf_csum_diff		__builtin_bpf_helper_csum_diff
+#define bpf_skb_get_tunnel_opt	__builtin_bpf_helper_skb_get_tunnel_opt
+#define bpf_skb_set_tunnel_opt	__builtin_bpf_helper_skb_set_tunnel_opt
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,8,0)
+
+#define bpf_skb_change_proto	__builtin_bpf_helper_skb_change_proto
+#define bpf_skb_change_type	__builtin_bpf_helper_skb_change_type
+#define bpf_skb_under_cgroup	__builtin_bpf_helper_skb_under_cgroup
+#define bpf_get_hash_recalc	__builtin_bpf_helper_get_hash_recalc
+#define bpf_get_current_task	__builtin_bpf_helper_get_current_task
+#define bpf_probe_write_user	__builtin_bpf_helper_probe_write_user
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,9,0)
+
+#define bpf_current_task_under_cgroup __builtin_bpf_helper_current_task_under_cgroup
+#define bpf_skb_change_tail	__builtin_bpf_helper_skb_change_tail
+#define bpf_skb_pull_data	__builtin_bpf_helper_skb_pull_data
+#define bpf_csum_update		__builtin_bpf_helper_csum_update
+#define bpf_set_hash_invalid	__builtin_bpf_helper_set_hash_invalid
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,10,0)
+
+#define bpf_get_numa_node_id	__builtin_bpf_helper_get_numa_node_id
+#define bpf_skb_change_head	__builtin_bpf_helper_skb_change_head
+#define bpf_xdp_adjust_head	__builtin_bpf_helper_xdp_adjust_head
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,11,0)
+
+#define bpf_probe_read_str	__builtin_bpf_helper_probe_read_str
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,12,0)
+
+#define bpf_get_socket_cookie	__builtin_bpf_helper_get_socket_cookie
+#define bpf_get_socket_uid	__builtin_bpf_helper_get_socket_uid
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,13,0)
+
+#define bpf_set_hash		__builtin_bpf_helper_set_hash
+#define bpf_setsockopt		__builtin_bpf_helper_setsockopt
+#define bpf_skb_adjust_room	__builtin_bpf_helper_skb_adjust_room
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,14,0)
+
+#define bpf_redirect_map	__builtin_bpf_helper_redirect_map
+#define bpf_sk_redirect_map	__builtin_bpf_helper_sk_redirect_map
+#define bpf_sock_map_update	__builtin_bpf_helper_sock_map_update
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,15,0)
+
+#define bpf_perf_event_read_value __builtin_bpf_helper_perf_event_read_value
+#define bpf_perf_prog_read_value  __builtin_bpf_helper_perf_prog_read_value
+#define bpf_getsockopt		  __builtin_bpf_helper_getsockopt
+#define bpf_xdp_adjust_meta	__builtin_bpf_helper_xdp_adjust_meta
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,16,0)
+
+#define bpf_override_return	__builtin_bpf_helper_override_return
+#define bpf_sock_ops_cb_flags_set __builtin_bpf_helper_sock_ops_cb_flags_set
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,17,0)
+
+#define bpf_msg_redirect_map	__builtin_bpf_helper_msg_redirect_map
+#define bpf_msg_apply_bytes	__builtin_bpf_helper_msg_apply_bytes
+#define bpf_msg_cork_bytes	__builtin_bpf_helper_msg_cork_bytes
+#define bpf_pull_data		__builtin_bpf_helper_pull_data
+#define bpf_bind		__builtin_bpf_helper_bpf_bind
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,18,0)
+
+#define bpf_xdp_adjust_tail	__builtin_bpf_helper_xdp_adjust_tail
+#define bpf_skb_get_xfrm_state	__builtin_bpf_helper_skb_get_xfrm_state
+#define bpf_get_stack		__builtin_bpf_helper_get_stack
+#define bpf_skb_load_bytes_relative __builtin_bpf_helper_skb_load_bytes_relative
+#define bpf_sock_hash_update	__builtin_bpf_helper_sock_hash_update
+#define bpf_msg_redirect_hash	__builtin_bpf_helper_msg_redirect_hash
+#define bpf_sk_redirect_hash	__builtin_bpf_helper_sk_redirect_hash
+#define bpf_lwt_push_encap		__builtin_bpf_helper_lwt_push_encap
+#define bpf_lwt_seg6_store_bytes	__builtin_bpf_helper_lwt_seg6_store_bytes
+#define bpf_lwt_seg6_adjust_srh		__builtin_bpf_helper_lwt_seg6_adjust_srh
+#define bpf_lwt_seg6_action		__builtin_bpf_helper_lwt_seg6_action
+#define bpf_rc_repeat			__builtin_bpf_helper_rc_repeat
+#define bpf_rc_keydown			__builtin_bpf_helper_rc_keydown
+#define bpf_skb_cgroup_id		__builtin_bpf_helper_skb_cgroup_id
+#define bpf_get_current_cgroup_id	__builtin_bpf_helper_get_current_cgroup_id
+
+static inline int
+bpf_fib_lookup (void *ctx, struct bpf_fib_lookup *param, int plen,
+		unsigned int flags)
+{
+  return __builtin_bpf_helper_fib_lookup (ctx, (void *) param, plen, flags);
+}
+
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,19,0)
+
+#define bpf_get_local_storage	__builtin_bpf_helper_get_local_storage
+#define bpf_sk_select_reuseport	__builtin_bpf_helper_sk_select_reuseport
+#define bpf_skb_ancestor_cgroup_id	__builtin_bpf_helper_skb_ancestor_cgroup_id
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (4,20,0)
+
+#define bpf_sk_release		__builtin_bpf_helper_sk_release
+#define bpf_map_push_elem	__builtin_bpf_helper_map_push_elem
+#define bpf_map_pop_elem	__builtin_bpf_helper_map_pop_elem
+#define bpf_map_peek_elem	__builtin_bpf_helper_map_peek_elem
+#define bpf_msg_push_data	__builtin_bpf_helper_msg_push_data
+
+static inline struct bpf_sock *
+bpf_sk_lookup_tcp (void *ctx, struct bpf_sock_tuple *tuple,
+		   int size, unsigned long long netns_id,
+		   unsigned long long flags)
+{
+  return
+    (struct bpf_sock *) __builtin_bpf_helper_sk_lookup_tcp (ctx,
+							    (void *) tuple,
+							    size,
+							    netns_id, flags);
+}
+
+static inline struct bpf_sock *
+bpf_sk_lookup_udp (void *ctx, struct bpf_sock_tuple *tuple,
+		   int size, unsigned long long netns_id,
+		   unsigned long long flags)
+{
+  return
+    (struct bpf_sock *) __builtin_bpf_helper_sk_lookup_udp (ctx,
+							    (void *) tuple,
+							    size,
+							    netns_id, flags);
+}
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (5,0,0)
+
+#define bpf_msg_pop_data	__builtin_bpf_helper_pop_data
+#define bpf_rc_pointer_rel	__builtin_bpf_helper_rc_pointer_rel
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (5,1,0)
+
+#define bpf_spin_lock		__builtin_bpf_helper_spin_lock
+#define bpf_spin_unlock		__builtin_bpf_helper_spin_unlock
+#define bpf_skb_ecn_set_ce	__builtin_bpf_helper_skb_ecn_set_ce
+
+static inline struct bpf_sock *
+bpf_sk_fullsock (struct bpf_sock *sk)
+{
+  return
+    (struct bpf_sock *) __builtin_bpf_helper_sk_fullsock ((void *) sk);
+}
+
+static inline struct bpf_sock *
+bpf_tcp_sock (struct bpf_sock *sk)
+{
+  return
+    (struct bpf_sock *) __builtin_bpf_helper_tcp_sock ((void *) sk);
+}
+
+static inline struct bpf_sock *
+bpf_get_listener_sock (struct bpf_sock *sk)
+{
+  return
+    (struct bpf_sock *) __builtin_bpf_helper_get_listener_sock ((void *) sk);
+}
+
+#if __BPF_KERNEL_VERSION_CODE__ >= KERNEL_VERSION (5,2,0)
+
+
+#endif /* 5.2 */
+#endif /* 5.1 */
+#endif /* 5.0 */
+#endif /* 4.20 */
+#endif /* 4.19 */
+#endif /* 4.18 */
+#endif /* 4.17 */
+#endif /* 4.16 */
+#endif /* 4.15 */
+#endif /* 4.14 */
+#endif /* 4.13 */
+#endif /* 4.12 */
+#endif /* 4.11 */
+#endif /* 4.10 */
+#endif /* 4.9 */
+#endif /* 4.8 */
+#endif /* 4.6 */
+#endif /* 4.5 */
+#endif /* 4.4 */
+#endif /* 4.3 */
+#endif /* 4.2 */
+#endif /* 4.1 */
+#endif /* 4.0 */
+
+/* Functions to emit BPF_LD_ABS and BPF_LD_IND instructions.  We
+   provide the "standard" names as synonyms of the corresponding GCC
+   builtins.  Note how the SKB argument is ignored.  */
+
+static inline long long
+load_byte (void *skb __attribute__ ((unused)),
+	   unsigned long long off)
+{
+  return __builtin_bpf_load_byte (off);
+}
+
+static inline long long
+load_half (void *skb __attribute__ ((unused)),
+	   unsigned long long off)
+{
+  return __builtin_bpf_load_half (off);
+}
+
+static inline long long
+load_word (void *skb __attribute__ ((unused)),
+	   unsigned long long off)
+{
+  return __builtin_bpf_load_word (off);
+}
+
+struct bpf_map_def
+{
+  unsigned int type;
+  unsigned int key_size;
+  unsigned int value_size;
+  unsigned int max_entries;
+  unsigned int map_flags;
+  unsigned int inner_map_idx;
+  unsigned int numa_node;
+};
+
+#endif /* ! __BPF_HELPERS_H */
diff --git a/gcc/config/bpf/bpf-opts.h b/gcc/config/bpf/bpf-opts.h
new file mode 100644
index 0000000..9f210a1
--- /dev/null
+++ b/gcc/config/bpf/bpf-opts.h
@@ -0,0 +1,56 @@
+/* Definitions for option handling for eBPF.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef BPF_OPTS_H
+#define BPF_OPTS_H
+
+/* Supported versions of the Linux kernel.  */
+enum bpf_kernel_version
+{
+  /* Linux 4.x */
+  LINUX_V4_0,
+  LINUX_V4_1,
+  LINUX_V4_2,
+  LINUX_V4_3,
+  LINUX_V4_4,
+  LINUX_V4_5,
+  LINUX_V4_6,
+  LINUX_V4_7,
+  LINUX_V4_8,
+  LINUX_V4_9,
+  LINUX_V4_10,
+  LINUX_V4_11,
+  LINUX_V4_12,
+  LINUX_V4_13,
+  LINUX_V4_14,
+  LINUX_V4_15,
+  LINUX_V4_16,
+  LINUX_V4_17,
+  LINUX_V4_18,
+  LINUX_V4_19,
+  LINUX_V4_20,
+  /* Linux 5.x  */
+  LINUX_V5_0,
+  LINUX_V5_1,
+  LINUX_V5_2,
+  LINUX_LATEST = LINUX_V5_2,
+  LINUX_NATIVE,
+};
+
+#endif /* ! BPF_OPTS_H */
diff --git a/gcc/config/bpf/bpf-protos.h b/gcc/config/bpf/bpf-protos.h
new file mode 100644
index 0000000..3a835f4
--- /dev/null
+++ b/gcc/config/bpf/bpf-protos.h
@@ -0,0 +1,33 @@
+/* Definition of eBPF target for GNU compiler.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_BPF_PROTOS_H
+#define GCC_BPF_PROTOS_H
+
+/* Routines implemented in bpf.c.  */
+
+extern HOST_WIDE_INT bpf_initial_elimination_offset (int, int);
+extern const char *bpf_output_call (rtx);
+extern void bpf_target_macros (cpp_reader *);
+extern void bpf_print_operand (FILE *, rtx, int);
+extern void bpf_print_operand_address (FILE *, rtx);
+extern void bpf_expand_prologue (void);
+extern void bpf_expand_epilogue (void);
+
+#endif /* ! GCC_BPF_PROTOS_H */
diff --git a/gcc/config/bpf/bpf.c b/gcc/config/bpf/bpf.c
new file mode 100644
index 0000000..8b2a592
--- /dev/null
+++ b/gcc/config/bpf/bpf.c
@@ -0,0 +1,948 @@
+/* Subroutines used for code generation for eBPF.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#define IN_TARGET_CODE 1
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "rtl.h"
+#include "regs.h"
+#include "insn-config.h"
+#include "insn-attr.h"
+#include "recog.h"
+#include "output.h"
+#include "alias.h"
+#include "tree.h"
+#include "stringpool.h"
+#include "attribs.h"
+#include "varasm.h"
+#include "stor-layout.h"
+#include "calls.h"
+#include "function.h"
+#include "explow.h"
+#include "memmodel.h"
+#include "emit-rtl.h"
+#include "reload.h"
+#include "tm_p.h"
+#include "target.h"
+#include "target-def.h"
+#include "basic-block.h"
+#include "expr.h"
+#include "optabs.h"
+#include "bitmap.h"
+#include "df.h"
+#include "c-family/c-common.h"
+#include "diagnostic.h"
+#include "builtins.h"
+#include "predict.h"
+#include "langhooks.h"
+
+/* Per-function machine data.  */
+struct GTY(()) machine_function
+{
+  /* Number of bytes saved on the stack for local variables.  */
+  int local_vars_size;
+
+  /* Number of bytes saved on the stack for callee-saved
+     registers.  */
+  int callee_saved_reg_size;
+};
+
+/* Data structures for the eBPF specific built-ins.  */
+
+/* Maximum number of arguments taken by a builtin function, plus
+   one.  */
+#define BPF_BUILTIN_MAX_ARGS 5
+
+enum bpf_builtins
+{
+  BPF_BUILTIN_UNUSED = 0,
+  /* Built-ins for kernel helpers.  */
+#define DEF_HELPER(V,D,N,T) BPF_BUILTIN_HELPER_##D,
+#  include "bpf-helpers.def"
+#undef DEF_HELPER
+  BPF_BUILTIN_HELPER_MAX,
+  /* Built-ins for non-generic loads and stores.  */
+  BPF_BUILTIN_LOAD_BYTE = BPF_BUILTIN_HELPER_MAX,
+  BPF_BUILTIN_LOAD_HALF,
+  BPF_BUILTIN_LOAD_WORD,
+  BPF_BUILTIN_MAX,
+};
+
+/* This table is indexed by an enum bpf_builtin.  */
+static const char *bpf_helper_names[] =
+{
+  NULL,
+#define DEF_HELPER(V,D,N,T) #N,
+#  include "bpf-helpers.def"
+#undef DEF_HELPER
+  NULL,
+  NULL,
+  NULL,
+  NULL
+};
+
+/* Return the builtin code corresponding to the kernel helper builtin
+   __builtin_NAME, or 0 if the name doesn't correspond to a kernel
+   helper builtin.  */
+
+static inline int
+bpf_helper_code (const char *name)
+{
+  int i;
+
+  for (i = 1; i < BPF_BUILTIN_HELPER_MAX; ++i)
+    if (strcmp (name, bpf_helper_names[i]) == 0)
+      return i;
+
+  return 0;
+}
+
+static GTY (()) tree bpf_builtins[(int) BPF_BUILTIN_MAX];
+
+/* Initialize the per-function machine status.  */
+
+static struct machine_function *
+bpf_init_machine_status (void)
+{
+  /* Note this initializes all fields to 0, which is just OK for
+     us.  */
+  return ggc_cleared_alloc<machine_function> ();
+}
+
+/* Override options and do some other initialization.  */
+
+static void
+bpf_option_override (void)
+{
+  /* Set the initializer for the per-function status structure.  */
+  init_machine_status = bpf_init_machine_status;
+}
+
+#undef TARGET_OPTION_OVERRIDE
+#define TARGET_OPTION_OVERRIDE bpf_option_override
+
+/* Define target-specific CPP macros.  This function in used in the
+   definition of TARGET_CPU_CPP_BUILTINS in bpf.h */
+
+#define builtin_define(TXT) cpp_define (pfile, TXT)
+
+void
+bpf_target_macros (cpp_reader *pfile)
+{
+  builtin_define ("__BPF__");
+  
+  if (TARGET_BIG_ENDIAN)
+    builtin_define ("__BPF_BIG_ENDIAN__");
+  else
+    builtin_define ("__BPF_LITTLE_ENDIAN__");
+
+  /* Define BPF_KERNEL_VERSION_CODE */
+  {
+    const char *version_code;
+    char *kernel_version_code;
+
+    switch (bpf_kernel)
+      {
+      case LINUX_V4_0: version_code = "0x40000"; break;
+      case LINUX_V4_1: version_code = "0x40100"; break;
+      case LINUX_V4_2: version_code = "0x40200"; break;
+      case LINUX_V4_3: version_code = "0x40300"; break;
+      case LINUX_V4_4: version_code = "0x40400"; break;
+      case LINUX_V4_5: version_code = "0x40500"; break;
+      case LINUX_V4_6: version_code = "0x40600"; break;
+      case LINUX_V4_7: version_code = "0x40700"; break;
+      case LINUX_V4_8: version_code = "0x40800"; break;
+      case LINUX_V4_9: version_code = "0x40900"; break;
+      case LINUX_V4_10: version_code = "0x40a00"; break;
+      case LINUX_V4_11: version_code = "0x40b00"; break;
+      case LINUX_V4_12: version_code = "0x40c00"; break;
+      case LINUX_V4_13: version_code = "0x40d00"; break;
+      case LINUX_V4_14: version_code = "0x40e00"; break;
+      case LINUX_V4_15: version_code = "0x40f00"; break;
+      case LINUX_V4_16: version_code = "0x41000"; break;
+      case LINUX_V4_17: version_code = "0x42000"; break;
+      case LINUX_V4_18: version_code = "0x43000"; break;
+      case LINUX_V4_19: version_code = "0x44000"; break;
+      case LINUX_V4_20: version_code = "0x45000"; break;
+      case LINUX_V5_0: version_code = "0x50000"; break;
+      case LINUX_V5_1: version_code = "0x50100"; break;
+      case LINUX_V5_2: version_code = "0x50200"; break;
+      default:
+	gcc_unreachable ();      
+      }
+
+    kernel_version_code = ACONCAT (("__BPF_KERNEL_VERSION_CODE__=",
+				    version_code, NULL));
+    builtin_define (kernel_version_code);
+  }
+}
+
+/* Output assembly directives to switch to section NAME.  The section
+   should have attributes as specified by FLAGS, which is a bit mask
+   of the 'SECTION_*' flags defined in 'output.h'.  If DECL is
+   non-NULL, it is the 'VAR_DECL' or 'FUNCTION_DECL' with which this
+   section is associated.  */
+
+static void
+bpf_asm_named_section (const char *name,
+		       unsigned int flags ATTRIBUTE_UNUSED,
+		       tree decl ATTRIBUTE_UNUSED)
+{
+  fprintf (asm_out_file, "\t.section\t%s\n", name);
+}
+
+#undef TARGET_ASM_NAMED_SECTION
+#define TARGET_ASM_NAMED_SECTION bpf_asm_named_section
+
+/* Return an RTX representing the place where a function returns or
+   receives a value of data type RET_TYPE, a tree node representing a
+   data type.  */
+
+static rtx
+bpf_function_value (const_tree ret_type,
+		    const_tree fntype_or_decl,
+		    bool outgoing ATTRIBUTE_UNUSED)
+{
+  enum machine_mode mode;
+  int unsignedp;
+
+  mode = TYPE_MODE (ret_type);
+  if (INTEGRAL_TYPE_P (ret_type))
+    mode = promote_function_mode (ret_type, mode, &unsignedp,
+				  fntype_or_decl, 1);
+
+  return gen_rtx_REG (mode, BPF_R0);
+}
+
+#undef TARGET_FUNCTION_VALUE
+#define TARGET_FUNCTION_VALUE bpf_function_value
+
+/* Return true if REGNO is the number of a hard register in which the
+   values of called function may come back.  */
+
+static bool
+bpf_function_value_regno_p (const unsigned int regno)
+{
+  return (regno == BPF_R0);
+}
+
+#undef TARGET_FUNCTION_VALUE_REGNO_P
+#define TARGET_FUNCTION_VALUE_REGNO_P bpf_function_value_regno_p
+
+/* Compute the size of the function's stack frame, including the local
+   area and the register-save area.  */
+
+static void
+bpf_compute_frame_layout (void)
+{
+  int stack_alignment = STACK_BOUNDARY / BITS_PER_UNIT;
+  int padding_locals, regno;
+
+  /* Set the space used in the stack by local variables.  This is
+     rounded up to respect the minimum stack alignment.  */
+  cfun->machine->local_vars_size = get_frame_size ();
+
+  padding_locals = cfun->machine->local_vars_size % stack_alignment;
+  if (padding_locals)
+    padding_locals = stack_alignment - padding_locals;
+
+  cfun->machine->local_vars_size += padding_locals;
+
+  /* Set the space used in the stack by callee-saved used registers in
+     the current function.  There is no need to round up, since the
+     registers are all 8 bytes wide.  */
+  for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
+    if ((!fixed_regs[regno]
+	 && df_regs_ever_live_p (regno)
+	 && !call_used_regs[regno])
+	|| (cfun->calls_alloca
+	    && regno == STACK_POINTER_REGNUM))
+      cfun->machine->callee_saved_reg_size += 8;
+
+  /* Check that the total size of the frame doesn't exceed the limit
+     imposed by eBPF.  */
+  if ((cfun->machine->local_vars_size
+       + cfun->machine->callee_saved_reg_size) > bpf_frame_limit)
+    {
+      static int stack_limit_exceeded = 0;
+
+      if (!stack_limit_exceeded)
+	error ("eBPF stack limit exceeded");
+      stack_limit_exceeded = 1;
+    }
+}
+
+#undef TARGET_COMPUTE_FRAME_LAYOUT
+#define TARGET_COMPUTE_FRAME_LAYOUT bpf_compute_frame_layout
+
+/* Expand to the instructions in a function prologue.  This function
+   is called when expanding the 'prologue' pattern in bpf.md.  */
+
+void
+bpf_expand_prologue (void)
+{
+  int regno, fp_offset;
+  rtx insn;
+  HOST_WIDE_INT size;
+
+  size = (cfun->machine->local_vars_size
+	  + cfun->machine->callee_saved_reg_size);
+  fp_offset = -cfun->machine->local_vars_size;
+
+  /* Save callee-saved hard registes.  The register-save-area starts
+     right after the local variables.  */
+  for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
+    {
+      if ((!fixed_regs[regno]
+	   && df_regs_ever_live_p (regno)
+	   && !call_used_regs[regno])
+	  || (cfun->calls_alloca
+	      && regno == STACK_POINTER_REGNUM))
+	{
+	  rtx mem;
+
+	  if (!IN_RANGE (fp_offset, -1 - 0x7fff, 0x7fff))
+	    /* This has been already reported as an error in
+	       bpf_compute_frame_layout. */
+	    break;
+	  else
+	    {
+	      mem = gen_frame_mem (DImode,
+				   plus_constant (DImode,
+						  hard_frame_pointer_rtx,
+						  fp_offset - 8));
+	      insn = emit_move_insn (mem, gen_rtx_REG (DImode, regno));
+	      RTX_FRAME_RELATED_P (insn) = 1;
+	      fp_offset -= 8;
+	    }
+	}
+    }
+
+  /* Set the stack pointer, if the function allocates space
+     dynamically.  Note that the value of %sp should be directly
+     derived from %fp, for the kernel verifier to track it as a stack
+     accessor.  */
+  if (cfun->calls_alloca)
+    {
+      insn = emit_move_insn (stack_pointer_rtx,
+			     hard_frame_pointer_rtx);
+      RTX_FRAME_RELATED_P (insn) = 1;
+      
+      if (size > 0)
+	{
+	  insn = emit_insn (gen_rtx_SET (stack_pointer_rtx,
+					 gen_rtx_PLUS (Pmode,
+						       stack_pointer_rtx,
+						       GEN_INT (-size))));
+	  RTX_FRAME_RELATED_P (insn) = 1;
+	}
+    }
+}
+
+/* Expand to the instructions in a function epilogue.  This function
+   is called when expanding the 'epilogue' pattern in bpf.md.  */
+
+void
+bpf_expand_epilogue (void)
+{
+  int regno, fp_offset;
+  rtx insn;
+
+  fp_offset = -cfun->machine->local_vars_size;
+
+  /* Restore callee-saved hard registes from the stack.  */
+  for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
+    {
+      if ((!fixed_regs[regno]
+	   && df_regs_ever_live_p (regno)
+	   && !call_used_regs[regno])
+	  || (cfun->calls_alloca
+	      && regno == STACK_POINTER_REGNUM))
+	{
+	  rtx mem;
+
+	  if (!IN_RANGE (fp_offset, -1 - 0x7fff, 0x7fff))
+	    /* This has been already reported as an error in
+	       bpf_compute_frame_layout. */
+	    break;
+	  else
+	    {
+	      mem = gen_frame_mem (DImode,
+				   plus_constant (DImode,
+						  hard_frame_pointer_rtx,
+						  fp_offset - 8));
+	      insn = emit_move_insn (gen_rtx_REG (DImode, regno), mem);
+	      RTX_FRAME_RELATED_P (insn) = 1;
+	      fp_offset -= 8;
+	    }
+	}
+    }
+
+  emit_jump_insn (gen_exit ());
+}
+
+/* Return the initial difference between the specified pair of
+   registers.  The registers that can figure in FROM, and TO, are
+   specified by ELIMINABLE_REGS in bpf.h.
+
+   This function is used in the definition of
+   INITIAL_ELIMINATION_OFFSET in bpf.h  */
+
+HOST_WIDE_INT
+bpf_initial_elimination_offset (int from, int to)
+{
+  HOST_WIDE_INT ret;
+
+  if (from == ARG_POINTER_REGNUM && to == STACK_POINTER_REGNUM)
+    ret = (cfun->machine->local_vars_size
+	   + cfun->machine->callee_saved_reg_size);
+  else if (from == ARG_POINTER_REGNUM && to == FRAME_POINTER_REGNUM)
+    ret = 0;
+  else
+    gcc_unreachable ();
+
+  return ret;
+}
+
+/* Return the number of consecutive hard registers, starting at
+   register number REGNO, required to hold a value of mode MODE.  */
+
+static unsigned int
+bpf_hard_regno_nregs (unsigned int regno ATTRIBUTE_UNUSED,
+		      enum machine_mode mode)
+{
+  return CEIL (GET_MODE_SIZE (mode), UNITS_PER_WORD);
+}
+
+#undef TARGET_HARD_REGNO_NREGS
+#define TARGET_HARD_REGNO_NREGS bpf_hard_regno_nregs
+
+/* Return true if it is permissible to store a value of mode MODE in
+   hard register number REGNO, or in several registers starting with
+   that one.  */
+
+static bool
+bpf_hard_regno_mode_ok (unsigned int regno ATTRIBUTE_UNUSED,
+			enum machine_mode mode)
+{
+  switch (mode)
+    {
+    case E_SImode:
+    case E_DImode:
+    case E_HImode:
+    case E_QImode:
+    case E_TImode:
+    case E_SFmode:
+    case E_DFmode:
+      return true;
+    default:
+      return false;
+    }
+}
+
+#undef TARGET_HARD_REGNO_MODE_OK
+#define TARGET_HARD_REGNO_MODE_OK bpf_hard_regno_mode_ok
+
+/* Return true if a function must have and use a frame pointer.  */
+
+static bool
+bpf_frame_pointer_required (void)
+{
+  /* We do not have a stack pointer, so we absolutely depend on the
+     frame-pointer in order to access the stack... and fishes walk and
+     pigs fly glglgl */
+  return true;
+}
+
+#undef TARGET_FRAME_POINTER_REQUIRED
+#define TARGET_FRAME_POINTER_REQUIRED bpf_frame_pointer_required
+
+/* Return `true' if the given RTX X is a valid base for an indirect
+   memory access.  STRICT has the same meaning than in
+   bpf_legitimate_address_p.  */
+
+static inline bool
+bpf_address_base_p (rtx x, bool strict)
+{
+  return (GET_CODE (x) == REG
+	  && (REGNO (x) < 11
+	      || (!strict && REGNO (x) >= FIRST_PSEUDO_REGISTER)));
+}
+
+/* Return true if X (a RTX) is a legitimate memory address on the
+   target machine for a memory operand of mode MODE.  */
+
+static bool
+bpf_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED,
+			  rtx x,
+			  bool strict)
+{
+  switch (GET_CODE (x))
+    {
+    case REG:
+      return bpf_address_base_p (x, strict);
+
+    case PLUS:
+      {
+	/* Accept (PLUS ADDR_BASE CONST_INT), provided CONST_INT fits
+	   in a signed 16-bit.
+
+	   Note that LABEL_REF and SYMBOL_REF are not allowed in
+	   REG+IMM addresses, because it is almost certain they will
+	   overload the offset field.  */
+
+	rtx x0 = XEXP (x, 0);
+	rtx x1 = XEXP (x, 1);
+	
+	if (bpf_address_base_p (x0, strict) && GET_CODE (x1) == CONST_INT)
+	  return IN_RANGE (INTVAL (x1), -1 - 0x7fff, 0x7fff);
+
+	break;
+      }
+    default:
+      break;
+    }
+
+  return false;
+}
+
+#undef TARGET_LEGITIMATE_ADDRESS_P
+#define TARGET_LEGITIMATE_ADDRESS_P bpf_legitimate_address_p
+
+/* Describe the relative costs of RTL expressions.  Return true when
+   all subexpressions of X have been processed, and false when
+   `rtx_cost' should recurse.  */
+
+static bool
+bpf_rtx_costs (rtx x ATTRIBUTE_UNUSED,
+	       enum machine_mode mode ATTRIBUTE_UNUSED,
+	       int outer_code ATTRIBUTE_UNUSED,
+	       int opno ATTRIBUTE_UNUSED,
+               int *total ATTRIBUTE_UNUSED,
+	       bool speed ATTRIBUTE_UNUSED)
+{
+  /* To be written.  */
+  return false;
+}
+
+#undef TARGET_RTX_COSTS
+#define TARGET_RTX_COSTS bpf_rtx_costs
+
+/* Return true if an argument at the position indicated by CUM should
+   be passed by reference.  If the hook returns true, a copy of that
+   argument is made in memory and a pointer to the argument is passed
+   instead of the argument itself.  */
+
+static bool
+bpf_pass_by_reference (cumulative_args_t cum ATTRIBUTE_UNUSED,
+		       const function_arg_info &arg)
+{
+  unsigned num_bytes = arg.type_size_in_bytes ();
+
+  /* Pass aggregates and values bigger than 5 words by reference.
+     Everything else is passed by copy.  */
+  return (arg.aggregate_type_p () || (num_bytes > 8*5));
+}
+
+#undef TARGET_PASS_BY_REFERENCE
+#define TARGET_PASS_BY_REFERENCE bpf_pass_by_reference
+
+/* Return a RTX indicating whether a function argument is passed in a
+   register and if so, which register.  */
+
+static rtx
+bpf_function_arg (cumulative_args_t ca, const function_arg_info &arg)
+{
+  CUMULATIVE_ARGS *cum = get_cumulative_args (ca);
+
+  if (*cum < 5)
+    return gen_rtx_REG (arg.mode, *cum + 1);
+  else
+    /* An error will be emitted for this in
+       bpf_function_arg_advance.  */
+    return NULL_RTX;
+}
+
+#undef TARGET_FUNCTION_ARG
+#define TARGET_FUNCTION_ARG bpf_function_arg
+
+/* Update the summarizer variable pointed by CA to advance past an
+   argument in the argument list.  */
+
+static void
+bpf_function_arg_advance (cumulative_args_t ca,
+			  const function_arg_info &arg)
+{
+  CUMULATIVE_ARGS *cum = get_cumulative_args (ca);
+  unsigned num_bytes = arg.type_size_in_bytes ();
+  unsigned num_words = CEIL (num_bytes, UNITS_PER_WORD);
+
+  if (*cum <= 5 && *cum + num_words > 5)
+    error ("too many function arguments for eBPF");
+
+  *cum += num_words;
+}
+
+#undef TARGET_FUNCTION_ARG_ADVANCE
+#define TARGET_FUNCTION_ARG_ADVANCE bpf_function_arg_advance
+
+/* Output the assembly code for a constructor.  Since eBPF doesn't
+   support indirect calls, constructors are not supported.  */
+
+static void
+bpf_output_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
+{
+  tree decl = SYMBOL_REF_DECL (symbol);
+
+  if (decl)
+    sorry_at (DECL_SOURCE_LOCATION (decl),
+	      "no constructors");
+  else
+    sorry ("no constructors");
+}
+
+#undef TARGET_ASM_CONSTRUCTOR
+#define TARGET_ASM_CONSTRUCTOR bpf_output_constructor
+
+/* Output the assembly code for a destructor.  Since eBPF doesn't
+   support indirect calls, destructors are not supported.  */
+
+static void
+bpf_output_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
+{
+  tree decl = SYMBOL_REF_DECL (symbol);
+
+  if (decl)
+    sorry_at (DECL_SOURCE_LOCATION (decl),
+	      "no destructors");
+  else
+    sorry ("no destructors");
+}
+
+#undef TARGET_ASM_DESTRUCTOR
+#define TARGET_ASM_DESTRUCTOR bpf_output_destructor
+
+/* Return the appropriate instruction to CALL to a function.  TARGET
+   is an RTX denoting the address of the called function.
+
+   The main purposes of this function are:
+   - To reject indirect CALL instructions, which are not supported by
+     eBPF.
+   - To recognize calls to kernel helper functions and emit the
+     corresponding CALL N instruction.
+
+   This function is called from the expansion of the 'call' pattern in
+   bpf.md.  */
+
+const char *
+bpf_output_call (rtx target)
+{
+  rtx xops[1];
+
+  switch (GET_CODE (target))
+    {
+    case CONST_INT:
+      output_asm_insn ("call\t%0", &target);
+      break;
+    case SYMBOL_REF:
+      {
+	const char *function_name = XSTR (target, 0);
+	int code;
+      
+	if (strncmp (function_name, "__builtin_bpf_helper_", 21) == 0
+	    && ((code = bpf_helper_code (function_name + 21)) != 0))
+	  {
+	    xops[0] = GEN_INT (code);
+	    output_asm_insn ("call\t%0", xops);
+	  }
+	else
+	  output_asm_insn ("call\t%0", &target);
+
+	break;
+      }
+    default:
+      error ("indirect call in function, which are not supported by eBPF");
+      output_asm_insn ("call 0", NULL);
+      break;
+    }
+
+  return "";
+}
+
+/* Print an instruction operand.  This function is called in the macro
+   PRINT_OPERAND defined in bpf.h */
+
+void
+bpf_print_operand (FILE *file, rtx op, int code ATTRIBUTE_UNUSED)
+{
+  switch (GET_CODE (op))
+    {
+    case REG:
+      fprintf (file, "%s", reg_names[REGNO (op)]);
+      break;
+    case MEM:
+      output_address (GET_MODE (op), XEXP (op, 0));
+      break;
+    case CONST_DOUBLE:
+      if (CONST_DOUBLE_HIGH (op))
+	fprintf (file, HOST_WIDE_INT_PRINT_DOUBLE_HEX,
+		 CONST_DOUBLE_HIGH (op), CONST_DOUBLE_LOW (op));
+      else if (CONST_DOUBLE_LOW (op) < 0)
+	fprintf (file, HOST_WIDE_INT_PRINT_HEX, CONST_DOUBLE_LOW (op));
+      else
+	fprintf (file, HOST_WIDE_INT_PRINT_DEC, CONST_DOUBLE_LOW (op));
+      break;
+    default:
+      output_addr_const (file, op);
+    }
+}
+
+/* Print an operand which is an address.  This function should handle
+   any legit address, as accepted by bpf_legitimate_address_p, and
+   also addresses that are valid in CALL instructions.
+
+   This function is called in the PRINT_OPERAND_ADDRESS macro defined
+   in bpf.h */
+
+void
+bpf_print_operand_address (FILE *file, rtx addr)
+{
+  switch (GET_CODE (addr))
+    {
+    case REG:
+      fprintf (file, "[%s+0]", reg_names[REGNO (addr)]);
+      break;
+    case PLUS:
+      {
+	rtx op0 = XEXP (addr, 0);
+	rtx op1 = XEXP (addr, 1);
+
+	if (GET_CODE (op0) == REG && GET_CODE (op1) == CONST_INT)
+	  {
+	    fprintf (file, "[%s+", reg_names[REGNO (op0)]);
+	    output_addr_const (file, op1);
+	    fputs ("]", file);
+	  }
+	else
+	  fatal_insn ("invalid address in operand", addr);
+	break;
+      }
+    case MEM:
+      /* Fallthrough.  */
+    case LABEL_REF:
+      /* Fallthrough.  */
+      fatal_insn ("unsupported operand", addr);
+      break;
+    default:
+      output_addr_const (file, addr);
+      break;
+    }
+}
+
+/* Add a BPF builtin function with NAME, CODE and TYPE.  Return
+   the function decl or NULL_TREE if the builtin was not added.  */
+
+static tree
+def_builtin (const char *name, enum bpf_builtins code, tree type)
+{
+  tree t
+    = add_builtin_function (name, type, code, BUILT_IN_MD, NULL, NULL_TREE);
+
+  bpf_builtins[code] = t;
+  return t;
+}
+
+/* Define machine-specific built-in functions.  */
+
+static void
+bpf_init_builtins (void)
+{
+  /* Built-ins for calling kernel helpers.  */
+
+  tree pt = build_pointer_type (void_type_node);
+  tree const_void_type
+    = build_qualified_type (void_type_node, TYPE_QUAL_CONST);
+  tree cpt = build_pointer_type (const_void_type);
+  tree st = short_integer_type_node;
+  tree ust = uint16_type_node;
+  tree it = integer_type_node;
+  tree ut = unsigned_type_node;
+  tree const_char_type
+    = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
+  tree cst = build_pointer_type (const_char_type);
+  tree vt = void_type_node;
+  tree ult = long_unsigned_type_node;
+  tree u32t = uint32_type_node;
+  tree u64t = uint64_type_node;
+  tree llt = long_long_integer_type_node;
+  tree ullt = long_long_unsigned_type_node;
+  
+#define TYPES build_function_type_list
+#define VTYPES build_varargs_function_type_list
+#define DEF_HELPER(V,D,N,T)				\
+  do							\
+    {							\
+      if (bpf_kernel >= (V))				\
+	def_builtin ("__builtin_bpf_helper_" #N,	\
+		     BPF_BUILTIN_HELPER_##D,		\
+		     T);				\
+    } while (0);
+#  include "bpf-helpers.def"
+#undef TYPES
+#undef VTYPES
+#undef DEF_HELPER
+
+  /* Built-ins for BPF_LD_ABS and BPF_LD_IND instructions.  */
+
+  def_builtin ("__builtin_bpf_load_byte", BPF_BUILTIN_LOAD_BYTE,
+	       build_function_type_list (ullt, ullt, 0));
+  def_builtin ("__builtin_bpf_load_half", BPF_BUILTIN_LOAD_HALF,
+	       build_function_type_list (ullt, ullt, 0));
+  def_builtin ("__builtin_bpf_load_word", BPF_BUILTIN_LOAD_WORD,
+	       build_function_type_list (ullt, ullt, 0));
+}
+
+#undef TARGET_INIT_BUILTINS
+#define TARGET_INIT_BUILTINS bpf_init_builtins
+
+/* Expand a call to a BPF-specific built-in function that was set up
+   with bpf_init_builtins.  */
+
+static rtx
+bpf_expand_builtin (tree exp, rtx target,
+		    rtx subtarget ATTRIBUTE_UNUSED,
+		    machine_mode mode ATTRIBUTE_UNUSED,
+		    int ignore)
+{
+  tree fndecl = TREE_OPERAND (CALL_EXPR_FN (exp), 0);
+  int code = DECL_MD_FUNCTION_CODE (fndecl);
+
+  if (code >= 1 && code < BPF_BUILTIN_HELPER_MAX)
+    {
+      /* This is a builtin to call a kernel helper function.
+
+	 For these builtins, we just expand the function call normally
+	 with expand_call like we would do for a libcall. The function
+	 bpf_output_call below will then do The Right Thing (TM),
+	 recognizing the name of the called __builtin_helper_* symbol
+	 and emitting the corresponding CALL N instruction whenever
+	 necessary.  */
+
+      return expand_call (exp, target, ignore);
+    }
+  else if (code == BPF_BUILTIN_LOAD_BYTE
+	   || code == BPF_BUILTIN_LOAD_HALF
+	   || code == BPF_BUILTIN_LOAD_WORD)
+    {
+      /* Expand an indirect load from the sk_buff in the context.
+	 There is just one argument to the builtin, which is the
+	 offset.
+
+	 We try first to expand a ldabs* instruction.  In case this
+	 fails, we try a ldind* instruction.  */
+
+      enum insn_code abs_icode
+	= (code == BPF_BUILTIN_LOAD_BYTE ? CODE_FOR_ldabsb
+	   : code == BPF_BUILTIN_LOAD_HALF ? CODE_FOR_ldabsh
+	   : CODE_FOR_ldabsw);
+
+      enum insn_code ind_icode
+	= (code == BPF_BUILTIN_LOAD_BYTE ? CODE_FOR_ldindb
+	   : code == BPF_BUILTIN_LOAD_HALF ? CODE_FOR_ldindh
+	   : CODE_FOR_ldindw);
+
+      tree offset_arg = CALL_EXPR_ARG (exp, 0);
+      struct expand_operand ops[2];
+
+      create_input_operand (&ops[0], expand_normal (offset_arg),
+			    TYPE_MODE (TREE_TYPE (offset_arg)));
+      create_input_operand (&ops[1], const0_rtx, SImode);
+
+      if (!maybe_expand_insn (abs_icode, 2, ops)
+	  && !maybe_expand_insn (ind_icode, 2, ops))
+	{
+	  error ("invalid argument to built-in function");
+	  return gen_rtx_REG (ops[0].mode, BPF_R0);
+	}
+
+      /* The result of the load is in R0.  */
+      return gen_rtx_REG (ops[0].mode, BPF_R0);
+    }
+
+  gcc_unreachable ();
+}
+
+#undef TARGET_EXPAND_BUILTIN
+#define TARGET_EXPAND_BUILTIN bpf_expand_builtin
+
+/* Initialize target-specific function library calls.  This is mainly
+   used to call library-provided soft-fp operations, since eBPF
+   doesn't support floating-point in "hardware".  */
+
+static void
+bpf_init_libfuncs (void)
+{
+  set_conv_libfunc (sext_optab, DFmode, SFmode,
+		    "__bpf_extendsfdf2");
+  set_conv_libfunc (trunc_optab, SFmode, DFmode,
+		    "__bpf_truncdfsf2");
+  set_conv_libfunc (sfix_optab, SImode, DFmode,
+		    "__bpf_fix_truncdfsi");
+  set_conv_libfunc (sfloat_optab, DFmode, SImode,
+		    "__bpf_floatsidf");
+  set_conv_libfunc (ufloat_optab, DFmode, SImode,
+		    "__bpf_floatunsidf");
+}
+
+#undef TARGET_INIT_LIBFUNCS
+#define TARGET_INIT_LIBFUNCS bpf_init_libfuncs
+
+/* Define the mechanism that will be used for describing frame unwind
+   information to the debugger.  In eBPF it is not possible to unwind
+   frames.  */
+
+static enum unwind_info_type
+bpf_debug_unwind_info ()
+{
+  return UI_NONE;
+}
+
+#undef TARGET_DEBUG_UNWIND_INFO
+#define TARGET_DEBUG_UNWIND_INFO bpf_debug_unwind_info
+
+/* Output assembly directives to assemble data of various sized and
+   alignments.  */
+
+#undef TARGET_ASM_BYTE_OP
+#define TARGET_ASM_BYTE_OP "\t.byte\t"
+#undef TARGET_ASM_ALIGNED_HI_OP
+#define TARGET_ASM_ALIGNED_HI_OP "\t.half\t"
+#undef TARGET_ASM_ALIGNED_SI_OP
+#define TARGET_ASM_ALIGNED_SI_OP "\t.word\t"
+#undef TARGET_ASM_ALIGNED_DI_OP
+#define TARGET_ASM_ALIGNED_DI_OP "\t.dword\t"
+
+/* Finally, build the GCC target.  */
+
+struct gcc_target targetm = TARGET_INITIALIZER;
+
+#include "gt-bpf.h"
diff --git a/gcc/config/bpf/bpf.h b/gcc/config/bpf/bpf.h
new file mode 100644
index 0000000..70ad818
--- /dev/null
+++ b/gcc/config/bpf/bpf.h
@@ -0,0 +1,539 @@
+/* Definition of the eBPF target for GCC.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_BPF_H
+#define GCC_BPF_H
+
+/**** Controlling the Compilation Driver.  */
+
+#define ASM_SPEC "%{mbig-endian:-EB} %{!mbig-endian:-EL}"
+#define LINK_SPEC "%{mbig-endian:-EB} %{!mbig-endian:-EL}"
+#define LIB_SPEC ""
+#define STARTFILE_SPEC ""
+
+/**** Run-time Target Specification.  */
+
+#define TARGET_CPU_CPP_BUILTINS() bpf_target_macros (pfile)
+
+/**** Storage Layout.  */
+
+/* Endianness and word size.  */
+#define BITS_BIG_ENDIAN 0
+#define BYTES_BIG_ENDIAN (TARGET_BIG_ENDIAN)
+#define WORDS_BIG_ENDIAN (TARGET_BIG_ENDIAN)
+#define BITS_PER_WORD 64
+#define UNITS_PER_WORD 8
+
+/* When storing an integer whose size is less than 64-bit in a
+   register, promote it to a DImode.  */
+#define PROMOTE_MODE(M, UNSIGNEDP, TYPE)	\
+  do						\
+    {						\
+      if (GET_MODE_CLASS (M) == MODE_INT	\
+	  && GET_MODE_SIZE (M) < 8)		\
+	M = DImode;				\
+    } while (0)
+
+/* Biggest alignment supported by the object file format of this
+   machine.  In this case this is ELF.  Use the same definition than
+   in elfos.h */
+#define MAX_OFILE_ALIGNMENT (((unsigned int) 1 << 28) * 8)
+
+/* Align argument parameters on the stack to 64-bit, at a minimum.  */
+#define PARM_BOUNDARY 64
+
+/* The hardware enforces that the stack pointer should be aligned to
+   64-bit at any time.  */
+#define STACK_BOUNDARY 64
+
+/* Function entry points are aligned to 128 bits.  */
+#define FUNCTION_BOUNDARY 128
+
+/* Maximum alignment required by data of any type.  */
+#define BIGGEST_ALIGNMENT 64
+
+/* The best alignment to use in cases where we have a choice.  */
+#define FASTEST_ALIGNMENT 64
+
+/* Use a fast alignment when storing arrays of chars in a local.  */
+#define LOCAL_ALIGNMENT(TYPE, ALIGN)					\
+  (TREE_CODE (TYPE) == ARRAY_TYPE					\
+   && TYPE_MODE (TREE_TYPE (TYPE)) == QImode				\
+   && (ALIGN) < FASTEST_ALIGNMENT ? FASTEST_ALIGNMENT : (ALIGN))
+
+/* The load and store instructions won't work if the data is not in
+   it's expected alignment.  */
+#define STRICT_ALIGNMENT 1
+
+/* We use Pmode as the mode of the size increment operand in an
+   `allocate_stack' pattern.  */
+#define STACK_SIZE_MODE Pmode
+
+/**** Layout of Source Language Data Types.  */
+
+#define INT_TYPE_SIZE         32
+#define SHORT_TYPE_SIZE       16
+#define LONG_TYPE_SIZE        64
+#define LONG_LONG_TYPE_SIZE   64
+#define CHAR_TYPE_SIZE         8
+#define FLOAT_TYPE_SIZE       32
+#define DOUBLE_TYPE_SIZE      64
+#define LONG_DOUBLE_TYPE_SIZE 64
+
+#define INTPTR_TYPE	"long int"
+#define UINTPTR_TYPE	"long unsigned int"
+#define SIZE_TYPE	"long unsigned int"
+#define PTRDIFF_TYPE "long int"
+
+#define SIG_ATOMIC_TYPE "char"
+
+#define INT8_TYPE "char"
+#define INT16_TYPE "short int"
+#define INT32_TYPE "int"
+#define INT64_TYPE "long int"
+#define UINT8_TYPE "unsigned char"
+#define UINT16_TYPE "short unsigned int"
+#define UINT32_TYPE "unsigned int"
+#define UINT64_TYPE "long unsigned int"
+
+#define INT_LEAST8_TYPE INT8_TYPE
+#define INT_LEAST16_TYPE INT16_TYPE
+#define INT_LEAST32_TYPE INT32_TYPE
+#define INT_LEAST64_TYPE INT64_TYPE
+#define UINT_LEAST8_TYPE UINT8_TYPE
+#define UINT_LEAST16_TYPE UINT16_TYPE
+#define UINT_LEAST32_TYPE UINT32_TYPE
+#define UINT_LEAST64_TYPE UINT64_TYPE
+
+#define INT_FAST8_TYPE INT8_TYPE
+#define INT_FAST16_TYPE INT16_TYPE
+#define INT_FAST32_TYPE INT32_TYPE
+#define INT_FAST64_TYPE INT64_TYPE
+#define UINT_FAST8_TYPE UINT8_TYPE
+#define UINT_FAST16_TYPE UINT16_TYPE
+#define UINT_FAST32_TYPE UINT32_TYPE
+#define UINT_FAST64_TYPE UINT64_TYPE
+
+/* `char' is signed by default, like in x86.  */
+#define DEFAULT_SIGNED_CHAR 1
+
+/* `wchar_t' is a signed 32-bit type.  The second constant is used by
+   cpp, which can't use WCHAR_TYPE.  */
+#define WCHAR_TYPE "int"
+#define WCHAR_TYPE_SIZE 32
+
+/* `wint_t' is a signed 32-bit type.  */
+#define WINT_TYPE "int"
+#define WINT_TYPE_SIZE 32
+
+/**** Register Usage.  */
+
+/*** Basic Characteristics of Registers.  */
+
+#define BPF_R0	0
+#define BPF_R1	1
+#define BPF_R2	2
+#define BPF_R3	3
+#define BPF_R4	4
+#define BPF_R5	5
+#define BPF_R6	6
+#define BPF_CTX BPF_R6
+#define BPF_R7	7
+#define BPF_R8	8
+#define BPF_R9	9
+#define BPF_SP BPF_R9
+#define BPF_R10	10
+#define BPF_FP  BPF_R10
+/* 11 is not a real eBPF hard register and is eliminated or not used
+   in the final assembler.  See below.  */
+
+#define FIRST_PSEUDO_REGISTER 12
+
+/* The registers %r0..%r8 are available for general allocation.
+   %r9 is the pseudo-stack pointer.
+   %r10 is the stack frame, which is read-only.
+   %r11 (__arg__) is a fake register that always gets eliminated.  */
+#define FIXED_REGISTERS				\
+  {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1}
+
+/* %r0..%r5 are clobbered by function calls.  */
+#define CALL_USED_REGISTERS				\
+  {1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1}
+
+/**** Register Classes.  */
+
+enum reg_class
+{
+  NO_REGS,		/* no registers in set.  */
+  ALL_REGS,		/* all registers.  */
+  LIM_REG_CLASSES	/* max value + 1.  */
+};
+
+#define N_REG_CLASSES (int) LIM_REG_CLASSES
+#define GENERAL_REGS ALL_REGS
+
+/* An initializer containing the names of the register classes as C
+   string constants.  These names are used in writing some of the
+   debugging dumps.  */
+#define REG_CLASS_NAMES				\
+{						\
+  "NO_REGS",					\
+  "ALL_REGS"					\
+}
+
+/* An initializer containing the contents of the register classes, as
+   integers which are bit masks.  The Nth integer specifies the
+   contents of class N.  The way the integer MASK is interpreted is
+   that register R is in the class if `MASK & (1 << R)' is 1.
+
+   In eBPF all the hard registers are considered general-purpose
+   integer registers.  */
+#define REG_CLASS_CONTENTS			\
+{						\
+   0x00000000, /* NO_REGS */			\
+   0x00000fff, /* ALL_REGS */		        \
+}
+
+/* A C expression whose value is a register class containing hard
+   register REGNO.  In general there is more that one such class;
+   choose a class which is "minimal", meaning that no smaller class
+   also contains the register.  */
+#define REGNO_REG_CLASS(REGNO) GENERAL_REGS
+
+/* A macro whose definition is the name of the class to which a
+   valid base register must belong.  A base register is one used in
+   an address which is the register value plus a displacement.  */
+#define BASE_REG_CLASS GENERAL_REGS
+
+/* A macro whose definition is the name of the class to which a
+   valid index register must belong.  An index register is one used
+   in an address where its value is either multiplied by a scale
+   factor or added to another register (as well as added to a
+   displacement).  */
+#define INDEX_REG_CLASS NO_REGS
+
+/* C expression which is nonzero if register number REGNO is suitable
+   for use as a base register in operand addresses.  In eBPF every
+   hard register can be used for this purpose.  */
+#define REGNO_OK_FOR_BASE_P(REGNO) 			\
+  ((REGNO) < FIRST_PSEUDO_REGISTER)
+
+/* C expression which is nonzero if register number REGNO is suitable
+   for use as an index register in operand addresses.  */
+#define REGNO_OK_FOR_INDEX_P(REGNO) false
+
+/**** Debugging Info ****/
+
+/* We cannot support DWARF2 because of the limitations of eBPF.  */
+#define DBX_DEBUGGING_INFO
+
+/**** Stack Layout and Calling Conventions.  */
+
+/*** Basic Stack Layout.  */
+
+#define STACK_GROWS_DOWNWARD 1
+#define FRAME_GROWS_DOWNWARD 1
+
+/* The argument pointer always points to the first argument.  */
+#define FIRST_PARM_OFFSET(FNDECL) 0
+
+/* Unsupported.  */
+#define RETURN_ADDR_RTX(count, frame) const0_rtx
+
+/*** Registers That Address the Stack Frame.  */
+
+#define FRAME_POINTER_REGNUM 10
+#define STACK_POINTER_REGNUM 9
+#define ARG_POINTER_REGNUM 11
+#define STATIC_CHAIN_REGNUM 8
+
+/*** Registers elimination.  */
+
+#define ELIMINABLE_REGS					\
+  {{ ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM },	\
+   { ARG_POINTER_REGNUM, STACK_POINTER_REGNUM }}
+
+/* Define the offset between two registers, one to be eliminated, and
+   the other its replacement, at the start of a routine.  */
+#define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)		\
+  do								\
+    {								\
+      (OFFSET) = bpf_initial_elimination_offset ((FROM), (TO));	\
+    } while (0)
+
+/*** Passing Function Arguments on the Stack.  */
+
+/* The eBPF ABI doesn't support passing arguments on the stack.  Only
+   in the first five registers.  Code in bpf.c assures the stack is
+   never used when passing arguments.  However, we still have to
+   define the constants below.  */
+
+/* If nonzero, push insns will be used to pass outgoing arguments.  */
+#define PUSH_ARGS 0
+
+/* If nonzero, function arguments will be evaluated from last to
+   first, rather than from first to last.  */
+#define PUSH_ARGS_REVERSED 1
+
+/* Allocate stack space for arguments at the beginning of each
+   function.  */
+#define ACCUMULATE_OUTGOING_ARGS 1
+
+/*** Passing Arguments in Registers.  */
+
+/* Use an integer in order to keep track of the number of arguments
+   passed to a function in integer registers, up to
+   MAX_ARGS_IN_REGISTERS.  */
+#define CUMULATIVE_ARGS int
+
+/* INIT_CUMULATIVE_ARGS initializes a variable CUM of type
+   CUMULATIVE_ARGS for a call to a function whose data type is FNTYPE.
+   For a library call, FNTYPE is 0.  */
+#define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME,FNDECL,N_NAMED_ARGS) \
+  memset (&(CUM), 0, sizeof (CUM))
+
+/* Nonzero if N is the number of a hard register in which function
+   arguments are sometimes passed.  */
+#define FUNCTION_ARG_REGNO_P(N) ((N) >= 1 && (N) <= 5)
+
+/*** How Scalar Function Values are Returned.  */
+
+/* Define how to find the value returned by a library function
+   assuming the value has mode MODE.  This is always %r0 for eBPF.  */
+#define LIBCALL_VALUE(MODE)  \
+  gen_rtx_REG ((MODE), 0)
+
+/*** Generating Code for Profiling.  */
+
+/* We do not support profiling yet, so do not call `mcount'.  */
+#define FUNCTION_PROFILER(FILE, LABELNO) do { } while (0)
+
+/*** Function Entry and Exit.  */
+
+/* We do not require an accurate stack pointer at function return.
+   This is because the stack pointer's original value is initialized
+   from the frame pointer, rather than decreased, to satisfy the
+   kernel's verifier.  Thus, we have to save the stack pointer in
+   function prologue and restore it in function epilogue.  If
+   EXIT_IGNORE_STACK is not set, then superfluous instructions are
+   generated to save and restore the stack pointer after and before
+   the function epilogue, respectively.  */
+#define EXIT_IGNORE_STACK 1
+
+/**** Support for Nested Functions.  */
+
+/* We have to define TRAMPOLINE_SIZE even if we don't ever generate
+   them.  Set to 64 arbitrarily.  */
+#define TRAMPOLINE_SIZE 64
+
+/**** Addressing Modes.  */
+
+/* Maximum number of registers that can appear in a valid memory
+   address.  */
+#define MAX_REGS_PER_ADDRESS 1
+
+/* 1 if X is an rtx for a constant that is a valid address.  */
+
+#define CONSTANT_ADDRESS_P(X) 0
+
+/**** Describing Relative Costs of Operations.  */
+
+/* Cost of a branch instruction.  A value of 1 is the default.  */
+#define BRANCH_COST(SPEED_P,PREDICTABLE_P) 1
+
+/* The SPARC port says: Nonzero if access to memory by bytes is slow
+   and undesirable.  For RISC chips, it means that access to memory by
+   bytes is no better than access by words when possible, so grab a
+   whole word and maybe make use of that.  */
+#define SLOW_BYTE_ACCESS 1
+
+/* Threshold of number of scalar memory-to-memory move instructions,
+   _below_ which a sequence of insns should be generated instead of a
+   string move insn or a library call.  */
+#define MOVE_RATIO(speed) 128
+
+/* Threshold of number of scalar move instructions, _below_ which a
+   sequence of insns should be generated to clear memory instead of a
+   string clear insn or a library call.  */
+#define CLEAR_RATIO(speed) 128
+
+/* Threshold of number of scalar move instructions, _below_ which a
+   sequence of insns should be generated to set memory to a constant
+   value, instead of a block set insn or a library call.  */
+#define SET_RATIO(speed) 128
+
+/* True if it is as good or better to call a constant function address
+   than to call an address kept in a register.  */
+#define NO_FUNCTION_CSE 1
+
+/**** Dividing the Output into Sections.  */
+
+#define TEXT_SECTION_ASM_OP "\t.text"
+#define DATA_SECTION_ASM_OP "\t.data"
+#define BSS_SECTION_ASM_OP "\t.bss"
+#define COMMON_ASM_OP "\t.common\t"
+
+/**** Defining the Output Assembler Language.  */
+
+/*** The Overall Framework of an Assembler File.  */
+
+#define ASM_COMMENT_START ";"
+
+/* Output to assembler file text saying following lines
+   may contain character constants, extra white space, comments, etc.  */
+
+#ifndef ASM_APP_ON
+#define ASM_APP_ON " #APP\n"
+#endif
+
+/* Output to assembler file text saying following lines
+   no longer contain unusual constructs.  */
+
+#ifndef ASM_APP_OFF
+#define ASM_APP_OFF " #NO_APP\n"
+#endif
+
+/*** Output of Data.  */
+
+/*** Output of Uninitialized Variables.  */
+
+/* How to output an assembler line to define a local common
+   symbol.  */
+
+#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)		\
+  do									\
+    {									\
+      fprintf ((FILE), "%s", COMMON_ASM_OP);				\
+      assemble_name ((FILE), (NAME));					\
+      fprintf ((FILE), ",%u,%u\n", (int)(SIZE), (ALIGN) / (BITS_PER_UNIT)); \
+    }									\
+  while (0)
+
+/* A C statement (sans semicolon) to output to the stdio stream
+   FILE the assembler definition of uninitialized global DECL named
+   NAME whose size is SIZE bytes and alignment is ALIGN bytes.
+   Try to use asm_output_aligned_bss to implement this macro.  */
+
+#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)	\
+  do {								\
+    ASM_OUTPUT_ALIGNED_LOCAL (FILE, NAME, SIZE, ALIGN);		\
+  } while (0)
+
+/* This says how to output an assembler line to define a local common
+   symbol.  */
+
+#define ASM_OUTPUT_ALIGNED_LOCAL(FILE,NAME,SIZE,ALIGN)			\
+  ( fputs ("\t.lcomm ", (FILE)),					\
+    assemble_name ((FILE), (NAME)),					\
+    fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED "\n",		\
+	     (SIZE), ((ALIGN) / BITS_PER_UNIT)))
+
+/*** Output and Generation of Labels.  */
+
+/* Globalizing directive for a label.  */
+#define GLOBAL_ASM_OP "\t.global\t"
+
+/* This is how to store into the string LABEL
+   the symbol_ref name of an internal numbered label where
+   PREFIX is the class of label and NUM is the number within the class.
+   This is suitable for output with `assemble_name'.  */
+
+#undef ASM_GENERATE_INTERNAL_LABEL
+#define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)			\
+  sprintf ((LABEL), "*%s%s%ld", (LOCAL_LABEL_PREFIX), (PREFIX), (long)(NUM))
+
+/*** Macros Controlling Initialization Routines.  */
+
+#define INIT_SECTION_ASM_OP "\t.init"
+#define FINI_SECTION_ASM_OP "\t.fini"
+
+/*** Output of Assembler Instructions.  */
+
+#define REGISTER_NAMES						\
+  { "%r0", "%r1", "%r2", "%r3", "%r4", "%r5", "%r6", "%r7",	\
+    "%r8", "%r9", "%fp", "__arg__" }
+
+#define ADDITIONAL_REGISTER_NAMES		\
+  { { "%a", 0 }, { "%ctx", 6 }, { "%r10" , 10 } }
+
+#define LOCAL_LABEL_PREFIX "."
+#define USER_LABEL_PREFIX  ""
+
+#define PRINT_OPERAND(STREAM,X,CODE)		\
+  bpf_print_operand ((STREAM),(X),(CODE))
+
+#define PRINT_OPERAND_ADDRESS(STREAM,X)		\
+  bpf_print_operand_address ((STREAM), (X))
+
+/*** Assembler Commands for Alignment.  */
+
+/* This is how to output an assembler line that says to advance the
+   location counter to a multiple of 2**LOG bytes.  */
+#define ASM_OUTPUT_ALIGN(STREAM,LOG)		\
+  fprintf (STREAM, "\t.align\t%d\n", (LOG))
+
+/* This is how to output an assembler line
+   that says to advance the location counter by SIZE bytes.  */
+#define ASM_OUTPUT_SKIP(FILE,SIZE)		\
+  fprintf (FILE, "\t.skip\t" HOST_WIDE_INT_PRINT_UNSIGNED "\n", (SIZE))
+
+/**** Miscellaneous Parameters.  */
+
+/* Specify the machine mode that this machine uses for the index in
+   the tablejump instruction.  */
+#define CASE_VECTOR_MODE DImode
+
+/* Define if operations between registers with integral mode smaller
+   than a word are always performed on the entire register.  */
+#define WORD_REGISTER_OPERATIONS 1
+
+/* C expression indicating when insns that read memory in MEM_MODE, an
+   integral mode narrower than a word, set the bits outsize of
+   MEM_MODE to be either the sign-extension or the zero-extension of
+   the data read.  */
+#define LOAD_EXTEND_OP(MODE) ZERO_EXTEND
+
+/* The maximum number of bytes that a single instruction can move
+   quickly between memory and registers or between two memory
+   locations.  */
+#define MOVE_MAX 8
+
+/* An alias for the machine mode for pointers.  */
+#define Pmode DImode
+
+/* An alias for the machine mode used for memory references to
+   functions being called, in 'call' RTL expressions.  */
+#define FUNCTION_MODE Pmode
+
+/* No libm on eBPF (for now.)  */
+#define MATH_LIBRARY ""
+
+/**** libgcc settings.  */
+
+/* Iterating over the global constructors and destructors and
+   executing them requires the ability of doing indirect calls.
+
+   eBPF doesn't support indirect calls, so no chance of supporting
+   constructors and destructors.  */
+#define DO_GLOBAL_CTORS_BODY			\
+  do { } while (0)
+#define DO_GLOBAL_DTORS_BODY			\
+  do { } while (0)
+
+#endif /* ! GCC_BPF_H */
diff --git a/gcc/config/bpf/bpf.md b/gcc/config/bpf/bpf.md
new file mode 100644
index 0000000..4c79522
--- /dev/null
+++ b/gcc/config/bpf/bpf.md
@@ -0,0 +1,497 @@
+;; Machine description for eBPF.
+;; Copyright (C) 2019 Free Software Foundation, Inc.
+
+;; This file is part of GCC.
+
+;; GCC is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+
+;; GCC is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GCC; see the file COPYING3.  If not see
+;; <http://www.gnu.org/licenses/>.
+
+(include "predicates.md")
+(include "constraints.md")
+
+;;;; Unspecs
+
+(define_c_enum "unspec" [
+  UNSPEC_LDINDABS
+  UNSPEC_XADD
+])
+
+;;;; Constants
+
+(define_constants
+  [(R0_REGNUM		0)
+   (R1_REGNUM		1)
+   (R2_REGNUM		2)
+   (R3_REGNUM		3)
+   (R4_REGNUM		4)
+   (R5_REGNUM		5)
+   (R6_REGNUM		6)
+   (R7_REGNUM		7)
+   (R8_REGNUM		8)
+   (R9_REGNUM		9)
+   (R10_REGNUM		10)
+   (R11_REGNUM		11)
+])
+
+;;;; Attributes
+
+;; Instruction classes.
+;; alu		64-bit arithmetic.
+;; alu32	32-bit arithmetic.
+;; end		endianness conversion instructions.
+;; ld		load instructions.
+;; lddx		load 64-bit immediate instruction.
+;; ldx		generic load instructions.
+;; st		generic store instructions for immediates.
+;; stx		generic store instructions.
+;; jmp		jump instructions.
+;; xadd		atomic exchange-and-add instructions.
+;; multi	multiword sequence (or user asm statements).
+
+(define_attr "type"
+  "unknown,alu,alu32,end,ld,lddw,ldx,st,stx,jmp,xadd,multi"
+  (const_string "unknown"))
+
+;; Length of instruction in bytes.
+(define_attr "length" ""
+  (cond [
+         (eq_attr "type" "lddw") (const_int 16)
+         ] (const_int 8)))
+
+;; Describe a user's asm statement.
+(define_asm_attributes
+  [(set_attr "type" "multi")])
+
+;;;; Mode attributes and iterators
+
+(define_mode_attr mop [(QI "b") (HI "h") (SI "w") (DI "dw")
+                       (SF "w") (DF "dw")])
+(define_mode_attr mtype [(SI "alu32") (DI "alu")])
+(define_mode_attr msuffix [(SI "32") (DI "")])
+
+;;;; NOPs
+
+(define_insn "nop"
+  [(const_int 0)]
+  ""
+  "mov\t%%r0,%%r0"
+  [(set_attr "type" "alu")])
+
+;;;; Arithmetic/Logical
+
+;; The arithmetic and logic operations below are defined for SI and DI
+;; modes.  The mode iterator AM is used in order to expand to two
+;; insns, with the proper modes.
+;;
+;; 32-bit arithmetic (for SI modes) is implemented using the alu32
+;; instructions.
+
+(define_mode_iterator AM [SI DI])
+
+;;; Addition
+(define_insn "add<AM:mode>3"
+  [(set (match_operand:AM          0 "register_operand"   "=r,r")
+        (plus:AM (match_operand:AM 1 "register_operand"   " 0,0")
+                 (match_operand:AM 2 "reg_or_imm_operand" " r,I")))]
+  "1"
+  "add<msuffix>\t%0,%2"
+  [(set_attr "type" "<mtype>")])
+
+;;; Subtraction
+
+;; Note that subtractions of constants become additions, so there is
+;; no need to handle immediate operands in the subMODE3 insns.
+
+(define_insn "sub<AM:mode>3"
+  [(set (match_operand:AM          0 "register_operand" "=r")
+        (minus:AM (match_operand:AM 1 "register_operand" " 0")
+                  (match_operand:AM 2 "register_operand" " r")))]
+  ""
+  "sub<msuffix>\t%0,%2"
+  [(set_attr "type" "<mtype>")])
+
+;;; Negation
+(define_insn "neg<AM:mode>2"
+  [(set (match_operand:AM 0 "register_operand" "=r")
+        (neg:AM (match_operand:AM 1 "register_operand" " 0")))]
+  ""
+  "neg<msuffix>\t%0"
+  [(set_attr "type" "<mtype>")])
+
+;;; Multiplication
+(define_insn "mul<AM:mode>3"
+  [(set (match_operand:AM          0 "register_operand"   "=r,r")
+        (mult:AM (match_operand:AM 1 "register_operand"   " 0,0")
+                 (match_operand:AM 2 "reg_or_imm_operand" " r,I")))]
+  ""
+  "mul<msuffix>\t%0,%2"
+  [(set_attr "type" "<mtype>")])
+
+(define_insn "*mulsidi3_zeroextend"
+  [(set (match_operand:DI	   0 "register_operand" "=r,r")
+        (zero_extend:DI
+         (mult:SI (match_operand:SI 1 "register_operand" "0,0")
+                  (match_operand:SI 2 "reg_or_imm_operand" "r,I"))))]
+  ""
+  "mul32\t%0,%2"
+  [(set_attr "type" "alu32")])
+
+;;; Division
+
+;; Note that eBPF doesn't provide instructions for signed integer
+;; division.
+
+(define_insn "udiv<AM:mode>3"
+  [(set (match_operand:AM 0 "register_operand" "=r,r")
+        (udiv:AM (match_operand:AM 1 "register_operand" " 0,0")
+                 (match_operand:AM 2 "reg_or_imm_operand" "r,I")))]
+  ""
+  "div<msuffix>\t%0,%2"
+  [(set_attr "type" "<mtype>")])
+
+;;; Modulus
+
+;; Note that eBPF doesn't provide instructions for signed integer
+;; remainder.
+
+(define_insn "umod<AM:mode>3"
+  [(set (match_operand:AM 0 "register_operand" "=r,r")
+        (umod:AM (match_operand:AM 1 "register_operand" " 0,0")
+                 (match_operand:AM 2 "reg_or_imm_operand" "r,I")))]
+  ""
+  "mod<msuffix>\t%0,%2"
+  [(set_attr "type" "<mtype>")])
+
+;;; Logical AND
+(define_insn "and<AM:mode>3"
+  [(set (match_operand:AM 0 "register_operand" "=r,r")
+        (and:AM (match_operand:AM 1 "register_operand" " 0,0")
+                (match_operand:AM 2 "reg_or_imm_operand" "r,I")))]
+  ""
+  "and<msuffix>\t%0,%2"
+  [(set_attr "type" "<mtype>")])
+
+;;; Logical inclusive-OR
+(define_insn "ior<AM:mode>3"
+  [(set (match_operand:AM 0 "register_operand" "=r,r")
+        (ior:AM (match_operand:AM 1 "register_operand" " 0,0")
+                (match_operand:AM 2 "reg_or_imm_operand" "r,I")))]
+  ""
+  "or<msuffix>\t%0,%2"
+  [(set_attr "type" "<mtype>")])
+
+;;; Logical exclusive-OR
+(define_insn "xor<AM:mode>3"
+  [(set (match_operand:AM 0 "register_operand" "=r,r")
+        (xor:AM (match_operand:AM 1 "register_operand" " 0,0")
+                (match_operand:AM 2 "reg_or_imm_operand" "r,I")))]
+  ""
+  "xor<msuffix>\t%0,%2"
+  [(set_attr "type" "<mtype>")])
+
+;;;; Conversions
+
+;;; Zero-extensions
+
+;; For register operands smaller than 32-bit zero-extending is
+;; achieved ANDing the value in the source register to a suitable
+;; mask.
+;;
+;; For register operands bigger or equal than 32-bit, we generate a
+;; mov32 instruction to zero the high 32-bits of the destination
+;; register.
+;;
+;; For memory operands, of any width, zero-extending is achieved using
+;; the ldx{bhwdw} instructions to load the values in registers.
+
+(define_insn "zero_extendhidi2"
+  [(set (match_operand:DI 0 "register_operand" "=r,r")
+	(zero_extend:DI (match_operand:HI 1 "nonimmediate_operand" "r,m")))]
+  ""
+  "@
+   and\t%0,0xffff
+   ldxh\t%0,%1"
+  [(set_attr "type" "alu,ldx")])
+
+(define_insn "zero_extendqidi2"
+  [(set (match_operand:DI 0 "register_operand" "=r,r")
+	(zero_extend:DI (match_operand:QI 1 "nonimmediate_operand" "r,m")))]
+  ""
+  "@
+   and\t%0,0xff
+   ldxb\t%0,%1"
+  [(set_attr "type" "alu,ldx")])
+
+(define_insn "zero_extendsidi2"
+  [(set (match_operand:DI 0 "register_operand" "=r,r")
+	(zero_extend:DI
+	  (match_operand:SI 1 "nonimmediate_operand" "r,m")))]
+  ""
+  "@
+   mov32\t%0,%1
+   ldxw\t%0,%1"
+  [(set_attr "type" "alu,ldx")])
+
+;;; Sign-extension
+
+;; Sign-extending a 32-bit value into a 64-bit value is achieved using
+;; shifting, with instructions generated by the expand below.
+
+(define_expand "extendsidi2"
+  [(set (match_operand:DI 0 "register_operand")
+	(sign_extend:DI (match_operand:SI 1 "register_operand")))]
+  ""
+{
+  operands[1] = gen_lowpart (DImode, operands[1]);
+  emit_insn (gen_ashldi3 (operands[0], operands[1], GEN_INT (32)));
+  emit_insn (gen_ashrdi3 (operands[0], operands[0], GEN_INT (32)));
+  DONE;
+})
+
+;;;; Data movement
+
+(define_mode_iterator MM [QI HI SI DI SF DF])
+
+(define_expand "mov<MM:mode>"
+  [(set (match_operand:MM 0 "general_operand")
+        (match_operand:MM 1 "general_operand"))]
+        ""
+        "
+{
+  if (!register_operand(operands[0], <MM:MODE>mode)
+      && !register_operand(operands[1], <MM:MODE>mode))
+    operands[1] = force_reg (<MM:MODE>mode, operands[1]); 
+}")
+
+(define_insn "*mov<MM:mode>"
+  [(set (match_operand:MM 0 "nonimmediate_operand" "=r, r,r,m,m")
+        (match_operand:MM 1 "mov_src_operand"      " m,rI,B,r,I"))]
+  ""
+  "@
+   ldx<mop>\t%0,%1
+   mov\t%0,%1
+   lddw\t%0,%1
+   stx<mop>\t%0,%1
+   st<mop>\t%0,%1"
+[(set_attr "type" "ldx,alu,alu,stx,st")])
+
+;;;; Shifts
+
+(define_mode_iterator SIM [SI DI])
+
+(define_insn "ashr<SIM:mode>3"
+  [(set (match_operand:SIM 0 "register_operand"                 "=r,r")
+        (ashiftrt:SIM (match_operand:SIM 1 "register_operand"   " 0,0")
+                      (match_operand:SIM 2 "reg_or_imm_operand" " r,I")))]
+  ""
+  "arsh<msuffix>\t%0,%2"
+  [(set_attr "type" "<mtype>")])
+
+(define_insn "ashl<SIM:mode>3"
+  [(set (match_operand:SIM 0 "register_operand"               "=r,r")
+        (ashift:SIM (match_operand:SIM 1 "register_operand"   " 0,0")
+                    (match_operand:SIM 2 "reg_or_imm_operand" " r,I")))]
+  ""
+  "lsh<msuffix>\t%0,%2"
+  [(set_attr "type" "<mtype>")])
+
+(define_insn "lshr<SIM:mode>3"
+  [(set (match_operand:SIM 0 "register_operand"                 "=r,r")
+        (lshiftrt:SIM (match_operand:SIM 1 "register_operand"   " 0,0")
+                      (match_operand:SIM 2 "reg_or_imm_operand" " r,I")))]
+  ""
+  "rsh<msuffix>\t%0,%2"
+  [(set_attr "type" "<mtype>")])
+
+;;;; Conditional branches
+
+;; The eBPF jump instructions use 64-bit arithmetic when evaluating
+;; the jump conditions.  Therefore we use DI modes below.
+
+(define_expand "cbranchdi4"
+  [(set (pc)
+	(if_then_else (match_operator 0 "comparison_operator"
+			[(match_operand:DI 1 "register_operand")
+			 (match_operand:DI 2 "reg_or_imm_operand")])
+		      (label_ref (match_operand 3 "" ""))
+		      (pc)))]
+  ""
+{
+  if (!ordered_comparison_operator (operands[0], VOIDmode))
+    FAIL;
+})
+
+(define_insn "*branch_on_di"
+  [(set (pc)
+	(if_then_else (match_operator 3 "ordered_comparison_operator"
+			 [(match_operand:DI 0 "register_operand" "r")
+			  (match_operand:DI 1 "reg_or_imm_operand" "rI")])
+		      (label_ref (match_operand 2 "" ""))
+		      (pc)))]
+  ""
+{
+  int code = GET_CODE (operands[3]);
+
+  switch (code)
+  {
+  case EQ: return "jeq\t%0,%1,%2"; break;
+  case NE: return "jne\t%0,%1,%2"; break;
+  case LT: return "jslt\t%0,%1,%2"; break;
+  case LE: return "jsle\t%0,%1,%2"; break;
+  case GT: return "jsgt\t%0,%1,%2"; break;
+  case GE: return "jsge\t%0,%1,%2"; break;
+  case LTU: return "jlt\t%0,%1,%2"; break;
+  case LEU: return "jle\t%0,%1,%2"; break;
+  case GTU: return "jgt\t%0,%1,%2"; break;
+  case GEU: return "jge\t%0,%1,%2"; break;
+  default:
+    gcc_unreachable ();
+    return "";
+  }
+}
+  [(set_attr "type" "jmp")])
+
+;;;; Unconditional branches
+
+(define_insn "jump"
+  [(set (pc)
+        (label_ref (match_operand 0 "" "")))]
+  ""
+  "ja\t%0"
+[(set_attr "type" "jmp")])
+
+;;;; Function prologue/epilogue
+
+(define_insn "exit"
+  [(simple_return)]
+  ""
+  "exit"
+  [(set_attr "type" "jmp")])
+
+(define_expand "prologue"
+  [(const_int 0)]
+  ""
+{
+  bpf_expand_prologue ();
+  DONE;
+})
+
+(define_expand "epilogue"
+  [(const_int 0)]
+  ""
+{
+  bpf_expand_epilogue ();
+  DONE;
+})
+
+;;;; Function calls
+
+(define_expand "call"
+  [(parallel [(call (match_operand 0 "")
+		    (match_operand 1 ""))
+	      (use (match_operand 2 ""))	;; next_arg_reg
+	      (use (match_operand 3 ""))])]	;; struct_value_size_rtx
+  ""
+{
+  rtx target = XEXP (operands[0], 0);
+  emit_call_insn (gen_call_internal (target, operands[1]));
+  DONE;
+})
+
+(define_insn "call_internal"
+  [(call (mem:DI (match_operand:DI 0 "call_operand" "Sr"))
+         (match_operand:SI 1 "general_operand" ""))]
+  ;; operands[2] is next_arg_register
+  ;; operands[3] is struct_value_size_rtx.
+  ""
+  { return bpf_output_call (operands[0]); }
+  [(set_attr "type" "jmp")])
+
+(define_expand "call_value"
+  [(parallel [(set (match_operand 0 "")
+		   (call (match_operand 1 "")
+			 (match_operand 2 "")))
+	      (use (match_operand 3 ""))])]		;; next_arg_reg
+  ""
+{
+  rtx target = XEXP (operands[1], 0);
+  emit_call_insn (gen_call_value_internal (operands[0], target,
+                                           operands[2]));
+  DONE;
+})
+
+(define_insn "call_value_internal"
+  [(set (match_operand 0 "register_operand" "")
+	(call (mem:DI (match_operand:DI 1 "call_operand" "Sr"))
+	      (match_operand:SI 2 "general_operand" "")))]
+  ;; operands[3] is next_arg_register
+  ;; operands[4] is struct_value_size_rtx.
+  ""
+  { return bpf_output_call (operands[1]); }
+  [(set_attr "type" "jmp")])
+
+(define_insn "sibcall"
+  [(call (label_ref (match_operand 0 "" ""))
+	 (match_operand:SI 1 "general_operand" ""))]
+  ;; operands[2] is next_arg_register
+  ;; operands[3] is struct_value_size_rtx.
+  ""
+  "ja\t%0"
+  [(set_attr "type" "jmp")])
+
+;;;; Non-generic load instructions
+
+(define_mode_iterator LDM [QI HI SI DI])
+(define_mode_attr ldop [(QI "b") (HI "h") (SI "w") (DI "dw")])
+
+(define_insn "ldind<ldop>"
+  [(set (reg:LDM R0_REGNUM)
+        (unspec:LDM [(match_operand:DI 0 "register_operand" "r")
+                    (match_operand:SI 1 "imm32_operand" "I")]
+                    UNSPEC_LDINDABS))
+   (clobber (reg:DI R1_REGNUM))
+   (clobber (reg:DI R2_REGNUM))
+   (clobber (reg:DI R3_REGNUM))
+   (clobber (reg:DI R4_REGNUM))]
+  ""
+  "ldind<ldop>\t%0,%1"
+  [(set_attr "type" "ld")])
+
+(define_insn "ldabs<ldop>"
+  [(set (reg:LDM R0_REGNUM)
+        (unspec:LDM [(match_operand:SI 0 "imm32_operand" "I")
+                    (match_operand:SI 1 "imm32_operand" "I")]
+                    UNSPEC_LDINDABS))
+   (clobber (reg:DI R1_REGNUM))
+   (clobber (reg:DI R2_REGNUM))
+   (clobber (reg:DI R3_REGNUM))
+   (clobber (reg:DI R4_REGNUM))]
+  ""
+  "ldabs<ldop>\t%0"
+  [(set_attr "type" "ld")])
+
+;;;; Atomic increments
+
+(define_mode_iterator AMO [SI DI])
+
+(define_insn "atomic_add<AMO:mode>"
+  [(set (match_operand:AMO 0 "memory_operand" "+m")
+        (unspec_volatile:AMO
+         [(plus:AMO (match_dup 0)
+                    (match_operand:AMO 1 "register_operand" "r"))
+          (match_operand:SI 2 "const_int_operand")] ;; Memory model.
+         UNSPEC_XADD))]
+  ""
+  "xadd<mop>\t%0,%1"
+  [(set_attr "type" "xadd")])
diff --git a/gcc/config/bpf/bpf.opt b/gcc/config/bpf/bpf.opt
new file mode 100644
index 0000000..e61cf95
--- /dev/null
+++ b/gcc/config/bpf/bpf.opt
@@ -0,0 +1,123 @@
+; Options for the eBPF compiler port.
+
+; Copyright (C) 2019 Free Software Foundation, Inc.
+;
+; This file is part of GCC.
+;
+; GCC is free software; you can redistribute it and/or modify it under
+; the terms of the GNU General Public License as published by the Free
+; Software Foundation; either version 3, or (at your option) any later
+; version.
+;
+; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+; WARRANTY; without even the implied warranty of MERCHANTABILITY or
+; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+; for more details.
+;
+; You should have received a copy of the GNU General Public License
+; along with GCC; see the file COPYING3.  If not see
+; <http://www.gnu.org/licenses/>.
+
+HeaderInclude
+config/bpf/bpf-opts.h
+
+; Selecting the kind of kernel the eBPF will be running on.
+
+mkernel=
+Target RejectNegative Joined Var(bpf_kernel) Enum(bpf_kernel) Init(LINUX_LATEST)
+Generate eBPF for the given Linux kernel version.
+
+Enum
+Name(bpf_kernel) Type(enum bpf_kernel_version)
+
+EnumValue
+Enum(bpf_kernel) String(native) Value(LINUX_NATIVE) DriverOnly
+
+EnumValue
+Enum(bpf_kernel) String(latest) Value(LINUX_LATEST) DriverOnly
+
+EnumValue
+Enum(bpf_kernel) String(4.0) Value(LINUX_V4_0)
+
+EnumValue
+Enum(bpf_kernel) String(4.1) Value(LINUX_V4_1)
+
+EnumValue
+Enum(bpf_kernel) String(4.2) Value(LINUX_V4_2)
+
+EnumValue
+Enum(bpf_kernel) String(4.3) Value(LINUX_V4_3)
+
+EnumValue
+Enum(bpf_kernel) String(4.4) Value(LINUX_V4_4)
+
+EnumValue
+Enum(bpf_kernel) String(4.5) Value(LINUX_V4_5)
+
+EnumValue
+Enum(bpf_kernel) String(4.6) Value(LINUX_V4_6)
+
+EnumValue
+Enum(bpf_kernel) String(4.7) Value(LINUX_V4_7)
+
+EnumValue
+Enum(bpf_kernel) String(4.8) Value(LINUX_V4_8)
+
+EnumValue
+Enum(bpf_kernel) String(4.9) Value(LINUX_V4_9)
+
+EnumValue
+Enum(bpf_kernel) String(4.10) Value(LINUX_V4_10)
+
+EnumValue
+Enum(bpf_kernel) String(4.11) Value(LINUX_V4_11)
+
+EnumValue
+Enum(bpf_kernel) String(4.12) Value(LINUX_V4_12)
+
+EnumValue
+Enum(bpf_kernel) String(4.13) Value(LINUX_V4_13)
+
+EnumValue
+Enum(bpf_kernel) String(4.14) Value(LINUX_V4_14)
+
+EnumValue
+Enum(bpf_kernel) String(4.15) Value(LINUX_V4_15)
+
+EnumValue
+Enum(bpf_kernel) String(4.16) Value(LINUX_V4_16)
+
+EnumValue
+Enum(bpf_kernel) String(4.17) Value(LINUX_V4_17)
+
+EnumValue
+Enum(bpf_kernel) String(4.18) Value(LINUX_V4_18)
+
+EnumValue
+Enum(bpf_kernel) String(4.19) Value(LINUX_V4_19)
+
+EnumValue
+Enum(bpf_kernel) String(4.20) Value(LINUX_V4_20)
+
+EnumValue
+Enum(bpf_kernel) String(5.0) Value(LINUX_V5_0)
+
+EnumValue
+Enum(bpf_kernel) String(5.1) Value(LINUX_V5_1)
+
+EnumValue
+Enum(bpf_kernel) String(5.2) Value(LINUX_V5_2)
+
+; Selecting big endian or little endian targets.
+
+mbig-endian
+Target RejectNegative Report Mask(BIG_ENDIAN)
+Generate big-endian eBPF.
+
+mlittle-endian
+Target RejectNegative Report InverseMask(BIG_ENDIAN)
+Generate little-endian eBPF.
+
+mframe-limit=
+Target Joined RejectNegative UInteger IntegerRange(0, 32767) Var(bpf_frame_limit) Init(512)
+Set a hard limit for the size of each stack frame, in bytes.
diff --git a/gcc/config/bpf/constraints.md b/gcc/config/bpf/constraints.md
new file mode 100644
index 0000000..f27b785
--- /dev/null
+++ b/gcc/config/bpf/constraints.md
@@ -0,0 +1,32 @@
+;; Constraint definitions for eBPF.
+;; Copyright (C) 2019 Free Software Foundation, Inc.
+;;
+;; This file is part of GCC.
+;;
+;; GCC is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+;;
+;; GCC is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with GCC; see the file COPYING3.  If not see
+;; <http://www.gnu.org/licenses/>.
+
+(define_constraint "I"
+  "A 32-bit signed immediate."
+  (and (match_code "const_int")
+       (match_test "IN_RANGE (ival, -1 - 0x7fffffff, 0x7fffffff)")))
+
+(define_constraint "B"
+  "A constant argument for LDDW."
+  (match_code "const,symbol_ref,label_ref,const_double,const_int"))
+
+(define_constraint "S"
+  "A constant call address."
+  (match_code "const,symbol_ref,label_ref,const_int"))
+
diff --git a/gcc/config/bpf/predicates.md b/gcc/config/bpf/predicates.md
new file mode 100644
index 0000000..9ba0e78
--- /dev/null
+++ b/gcc/config/bpf/predicates.md
@@ -0,0 +1,64 @@
+;; Predicate definitions for eBPF.
+;; Copyright (C) 2019 Free Software Foundation, Inc.
+;;
+;; This file is part of GCC.
+;;
+;; GCC is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+;;
+;; GCC is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with GCC; see the file COPYING3.  If not see
+;; <http://www.gnu.org/licenses/>.
+
+(define_predicate "reg_or_imm_operand"
+  (ior (and (match_code "const_int")
+            (match_test "IN_RANGE (INTVAL (op), -1 - 0x7fffffff, 0x7fffffff)"))
+       (match_operand 0 "register_operand")))
+
+(define_predicate "imm32_operand"
+  (ior (and (match_code "const_int")
+            (match_test "IN_RANGE (INTVAL (op), 0, 0xffffffff)"))
+       (match_code "symbol_ref,label_ref,const")))
+
+(define_predicate "lddw_operand"
+  (match_code "symbol_ref,label_ref,const,const_double,const_int"))
+
+(define_predicate "call_operand"
+  (match_code "reg,symbol_ref,const_int,const")
+{
+  if (GET_CODE (op) == CONST)
+    {
+      op = XEXP (op, 0);
+
+      switch (GET_CODE (op))
+	{
+	case SYMBOL_REF:
+	case LABEL_REF:
+	case CONST_INT:
+	  return true;
+	  break;
+	default:
+	  break;
+	}
+
+      return false;
+    }
+
+  return true;
+})
+
+(define_predicate "mov_src_operand"
+  (ior (match_operand 0 "memory_operand")
+       (match_operand 0 "reg_or_imm_operand")
+       (match_operand 0 "lddw_operand")))
+
+(define_predicate "register_compare_operator"
+  (match_code "eq,ne,geu,gtu,ge,gt"))
+
diff --git a/gcc/config/bpf/t-bpf b/gcc/config/bpf/t-bpf
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/gcc/config/bpf/t-bpf