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[PATCH V4 00/11] eBPF support for GCC


[Differences from V3:
. Formatting/style fixes:
  + Remove redundant braces.
  + Remove unneeded ATTRIBUTE_UNUSED.
  + Truncate too long lines.
  + Remove an odd line split.
  + Do not break after returns.
  + Use function_arg_info methods instead of auxiliary functions.
  + Fix indentation in cbranchdi4.
. Use `sorry' and sorry_at to report lack of support for valid
  constructs.
. Rename GR_REGS to GENERAL_REGS and exclude the pseudo arg_reg
  from the class.
. Fix opcode in "sub<AM:mode>3" insns.
. The mul32 instruction zero-extends arguments and then performs
  a multiplication.  Use the right pattern for this in bpf.md and
  name it umulsidi3.
. Use a mov32 instructions for zero-extending 32-bit values to 64-bit.
. Remove the *extendsidi2 insn, as it is not needed.
. (now for real, ahem) Remove dubious code from the move expanders, by
  not accepting constant addresses as legit.  Rework handling of call
  instructions accordingly.
. Improve "too many arguments" error reporting.
  New test gcc.target/bpf/diag-funargs-3.c.
. xfail gcc.target/bpf/constant-calls.c.
. Rebased to today's master.]

Hi people!

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.

eBPF architecture and ABI
=========================
   
Documentation for eBPF can be found in the linux kernel source tree,
file Documentation/networking/filter.txt.  It covers the instructions
set, the way the interpreter works and the many restrictions imposed
by the kernel verifier.
   
As for the ABI, att this moment compiled eBPF doesn't have very well
established conventions.  The details on what is expected to be in an
ELF file containing eBPF is determined, in practice, by what the llvm
BPF backend generates and what is expected by the the two existing
kernel loaders: bpf_load.c and libbpf.

We hope that the addition of this port to the GNU toolchain will help
to mature this domain.

Overview of the patch series
============================
   
The first few patches are preparatory:

. The first patch updates config.guess and config.sub from the
  'config' upstream project, in order to recognize bpf-*-* triplets.

. The second patch fixes an integrity check in opt-functions.awk.

. The third patch annotates many tests in the gcc.c-torture/compile
  testsuite with their requirements in terms of stack frame size,
  using the existing dg-require-stack-size machinery.

. The fourth patch introduces a new effective target flag called
  indirect_call, and annotates the tests in gcc.c-torture/compile
  accordingly.

The rest of the patches are BPF specific:

The fifth patch adds the new GCC port proper.  Machine description,
implementation of target hooks and macros, command-line options and
the like.

The sixth patch adds a libgcc port for eBPF.  At the moment, it is
minimal and it basically addresses the limitations imposed by the
target, by excluding a few functions in libgcc2 (all of them related
to TImodes) whose default implementations exceed the eBPF stack limit.

The seventh, eight and ninth patches deal with testing the new
port. The gcc.target testsuite is extended with eBPF-specific tests,
covering the backend-specific built-in functions and diagnostics.  The
check-effective-target functions are made aware of eBPF targets. Many
tests in the gcc.c-torture/compile testsuite are annotated to be
skipped in bpf-*-* targets, since they violate some restriction
imposed by the hardware (such as surpassing the stack limit.)  The
resulting testsuite doesn't have unexpected failures, and is currently
the principal way to check for regressions in the port.  Likewise,
many tests in the gcc.dg testsuite are annotated to be skipped in
bpf-*-* targets.

The tenth patch adds documentation updates to the GCC manual,
including information on the new command line options and compiler
built-ins.

Finally, the last patch adds myself as the maintainer of the BPF port.
I personally commit to evolve and maintain the port for as long as
necessary, and to find a suitable replacement in case I have to step
down for whatever reason.

Some notes on the port
======================

As a compilation target, eBPF is rather peculiar.  This is mainly due
to the quite hard restrictions imposed by the kernel verifier, and
also due to the security-driven design of the architecture itself.

To list a few examples:

. The stack is disjoint, and each stack frame corresponding to a
  function activation is isolated: it is not possible for a callee to
  access the stack frame of the caller, nor for a caller to access the
  stack frame of it's callees.  The frame pointer register is
  read-only.

. Therefore it is not possible to pass arguments in the stack.

. Argument passing is restricted to 5 arguments.

. Each stack frame is limited to 512 bytes by default.

. The instruction set doesn't support indirect jumps.

. The instruction set doesn't support indirect calls.

. The architecture doesn't provide an explicit stack pointer.
  Instead, the eBPF "hardware" (in this case the kernel verifier)
  examines the compiled program and, by looking at the way the stack
  is accessed, estimates the size of the stack frame for each
  function.

. eBPF "programs" are not ELF executables, but relocatable ELF
  objects.  This is because the kernel loaders need access to certain
  relocations, and each object contains several entry points, which
  are different kind of eBPF kernel programs hooked to different parts
  of the kernel.  We are working on a more "Elf conventional"
  alternative load model for eBPF programs, but that's a tangent at
  this point.

Restrictions like the above impact the port in several ways, some of
which are good to keep in mind while reviewing the patches:

. Only (a subset of) C is supported at the moment.  It should be
  possible to add more languages in the future, as the eBPF kernel
  verifier gets smarter and therefore more sophisticated programs are
  allowed.

. The back end tries to issue errors when an eBPF restriction is
  violated.  This is to increase the chances of the resulting objects
  to be palatable to the kernel verifier, shortening the development
  cycle.

. Dynamic stack allocation (alloca and VLAs) is achieved by using what
  otherwise would be a perfectly normal general register, %r9, as a
  pseudo stack pointer.  This has the disadvantage of making the
  register "fixed" and therefore not available for general register
  allocation.  Hopefully there is a way to conditionalize this, since
  both alloca and VLAs are relatively uncommon; I haven't found it
  yet.

. The restrictions imposed by the kernel verifier, the characteristics
  of the virtual architecture, the available kernel helpers, and the
  behavior of the loaders, all change from one version of the kernel
  to another. Therefore, the GCC backend provides a -mkernel command
  line option that specifies the minimum kernel version in which the
  program is to be executed.  This is conceptually similar to the
  -mcpu option provided by most ports.

I am preparing a white paper on "compiled eBPF" that will be available
at the Cauldron next month, addressing the points above, and many
others, in depth.

I am really eager to discuss with you people, how to best compile eBPF
:)

Present and future work
=======================

This port provides a rough equivalence of what the llvm port does [1]
and, along with the binutils support, it can be used to develop
compiled eBPF applications.

However, it is in no way finished.

There are a lot of further refinements and additions to the port on
our radar: how to translate more C, CO-RE capabilities (compile-once,
run-everywhere), generation of BTF, and much more...  the eBPF field
moves very fast!

Also, a simulator and GDB support is on the works.  Once completed, it
will emulate the different kernel contexts where eBPF programs
execute.  Once the simulator works, a suitable board description will
be added to dejagnu, making it possible to run the GCC testsuites on
it.

Now that GCC is entering the play, there will be two C compilers able
to generate eBPF, the other being clang/llvm.  Interoperability
between programs generated by both compilers becomes an important
concern, and keeping it will be an an on-going task, requiring
communication between the compilers communities and the kernel
community.

[1] modulus the very recently added CO-RE stuff added in llvm upstream
    a few weeks ago.
   
Testing
=======
   
The following test suites have been executed for target
bpf-unknown-none in a x86-64-pc-linux-gnu host, using the latest
binutils from master, and a board description containin the following
definitions:

    set_board_info mathlib ""
    set_board_info gcc,stack_size 512
    set_board_info cflags "-mframe-limit=32767"

Running /home/jemarch/gnu/src/gcc-git/gcc/testsuite/gcc.target/bpf/bpf.exp ...

		=== gcc Summary ===

   # of expected passes		230
   # of expected failures	1
   # of unresolved testcases	3

Running /home/jemarch/gnu/src/gcc-git/gcc/testsuite/gcc.c-torture/compile/compile.exp ...

		=== gcc Summary ===

   # of expected passes		11743
   # of unresolved testcases	28
   # of unsupported tests	1482

Running /home/jemarch/gnu/src/gcc-git/gcc/testsuite/gcc.dg/dg.exp ...

		=== gcc Summary ===

   # of expected passes		23062
   # of unexpected failures	819
   # of unexpected successes	3
   # of expected failures	267
   # of unresolved testcases	559
   # of unsupported tests	649
   
Most of the failures running the gcc-dg tests are due to linker errors
like undefined references to `exit' and other standard functions,
which are not available for the target.

Jose E. Marchesi (11):
  Update config.sub and config.guess.
  opt-functions.awk: fix comparison of limit, begin and end
  testsuite: annotate c-torture/compile tests with dg-require-stack-size
  testsuite: new require effective target indirect_calls
  bpf: new GCC port
  bpf: new libgcc port
  bpf: gcc.target eBPF testsuite
  bpf: make target-supports.exp aware of eBPF
  bpf: adjust GCC testsuite to eBPF limitations
  bpf: manual updates for eBPF
  bpf: add myself as the maintainer for the eBPF port

 ChangeLog                                          |  15 +
 MAINTAINERS                                        |   2 +-
 config.guess                                       | 264 ++++--
 config.sub                                         |  50 +-
 configure                                          |  54 +-
 configure.ac                                       |  54 +-
 contrib/ChangeLog                                  |   4 +
 contrib/config-list.mk                             |   3 +-
 gcc/ChangeLog                                      |  33 +
 gcc/common/config/bpf/bpf-common.c                 |  55 ++
 gcc/config.gcc                                     |   9 +
 gcc/config/bpf/bpf-helpers.def                     | 194 +++++
 gcc/config/bpf/bpf-helpers.h                       | 327 +++++++
 gcc/config/bpf/bpf-opts.h                          |  56 ++
 gcc/config/bpf/bpf-protos.h                        |  33 +
 gcc/config/bpf/bpf.c                               | 958 +++++++++++++++++++++
 gcc/config/bpf/bpf.h                               | 532 ++++++++++++
 gcc/config/bpf/bpf.md                              | 497 +++++++++++
 gcc/config/bpf/bpf.opt                             | 123 +++
 gcc/config/bpf/constraints.md                      |  32 +
 gcc/config/bpf/predicates.md                       |  72 ++
 gcc/config/bpf/t-bpf                               |   0
 gcc/doc/extend.texi                                | 171 ++++
 gcc/doc/invoke.texi                                |  37 +
 gcc/doc/sourcebuild.texi                           |   4 +
 gcc/opt-functions.awk                              |   5 +-
 gcc/testsuite/ChangeLog                            | 303 +++++++
 gcc/testsuite/gcc.c-torture/compile/20000211-1.c   |   2 +
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 gcc/testsuite/gcc.target/bpf/helper-fib-lookup.c   |  16 +
 .../gcc.target/bpf/helper-get-cgroup-classid.c     |  14 +
 .../gcc.target/bpf/helper-get-current-cgroup-id.c  |  13 +
 .../gcc.target/bpf/helper-get-current-comm.c       |  15 +
 .../gcc.target/bpf/helper-get-current-pid-tgid.c   |  13 +
 .../gcc.target/bpf/helper-get-current-task.c       |  14 +
 .../gcc.target/bpf/helper-get-current-uid-gid.c    |  13 +
 .../gcc.target/bpf/helper-get-hash-recalc.c        |  14 +
 .../gcc.target/bpf/helper-get-listener-sock.c      |  13 +
 .../gcc.target/bpf/helper-get-local-storage.c      |  14 +
 .../gcc.target/bpf/helper-get-numa-node-id.c       |  13 +
 .../gcc.target/bpf/helper-get-prandom-u32.c        |  13 +
 .../gcc.target/bpf/helper-get-route-realm.c        |  14 +
 .../gcc.target/bpf/helper-get-smp-processor-id.c   |  13 +
 .../gcc.target/bpf/helper-get-socket-cookie.c      |  14 +
 .../gcc.target/bpf/helper-get-socket-uid.c         |  14 +
 gcc/testsuite/gcc.target/bpf/helper-get-stack.c    |  16 +
 gcc/testsuite/gcc.target/bpf/helper-get-stackid.c  |  15 +
 gcc/testsuite/gcc.target/bpf/helper-getsockopt.c   |  17 +
 gcc/testsuite/gcc.target/bpf/helper-ktime-get-ns.c |  12 +
 .../gcc.target/bpf/helper-l3-csum-replace.c        |  16 +
 .../gcc.target/bpf/helper-l4-csum-replace.c        |  16 +
 .../gcc.target/bpf/helper-lwt-push-encap.c         |  15 +
 .../gcc.target/bpf/helper-lwt-seg6-action.c        |  16 +
 .../gcc.target/bpf/helper-lwt-seg6-adjust-srh.c    |  16 +
 .../gcc.target/bpf/helper-lwt-seg6-store-bytes.c   |  16 +
 .../gcc.target/bpf/helper-map-delete-elem.c        |  14 +
 .../gcc.target/bpf/helper-map-lookup-elem.c        |  12 +
 .../gcc.target/bpf/helper-map-peek-elem.c          |  14 +
 gcc/testsuite/gcc.target/bpf/helper-map-pop-elem.c |  14 +
 .../gcc.target/bpf/helper-map-push-elem.c          |  16 +
 .../gcc.target/bpf/helper-map-update-elem.c        |  16 +
 .../gcc.target/bpf/helper-msg-apply-bytes.c        |  15 +
 .../gcc.target/bpf/helper-msg-cork-bytes.c         |  15 +
 gcc/testsuite/gcc.target/bpf/helper-msg-pop-data.c |  16 +
 .../gcc.target/bpf/helper-msg-pull-data.c          |  16 +
 .../gcc.target/bpf/helper-msg-push-data.c          |  16 +
 .../gcc.target/bpf/helper-msg-redirect-hash.c      |  16 +
 .../gcc.target/bpf/helper-msg-redirect-map.c       |  17 +
 .../gcc.target/bpf/helper-override-return.c        |  15 +
 .../gcc.target/bpf/helper-perf-event-output.c      |  17 +
 .../gcc.target/bpf/helper-perf-event-read-value.c  |  16 +
 .../gcc.target/bpf/helper-perf-event-read.c        |  15 +
 .../gcc.target/bpf/helper-perf-prog-read-value.c   |  15 +
 .../gcc.target/bpf/helper-probe-read-str.c         |  16 +
 gcc/testsuite/gcc.target/bpf/helper-probe-read.c   |  15 +
 .../gcc.target/bpf/helper-probe-write-user.c       |  15 +
 gcc/testsuite/gcc.target/bpf/helper-rc-keydown.c   |  17 +
 .../gcc.target/bpf/helper-rc-pointer-rel.c         |  15 +
 gcc/testsuite/gcc.target/bpf/helper-rc-repeat.c    |  14 +
 gcc/testsuite/gcc.target/bpf/helper-redirect-map.c |  16 +
 .../gcc.target/bpf/helper-set-hash-invalid.c       |  13 +
 gcc/testsuite/gcc.target/bpf/helper-set-hash.c     |  15 +
 gcc/testsuite/gcc.target/bpf/helper-setsockopt.c   |  19 +
 gcc/testsuite/gcc.target/bpf/helper-sk-fullsock.c  |  13 +
 .../gcc.target/bpf/helper-sk-lookup-tcp.c          |  19 +
 .../gcc.target/bpf/helper-sk-lookup-upd.c          |  19 +
 .../gcc.target/bpf/helper-sk-redirect-hash.c       |  16 +
 .../gcc.target/bpf/helper-sk-redirect-map.c        |  16 +
 gcc/testsuite/gcc.target/bpf/helper-sk-release.c   |  14 +
 .../gcc.target/bpf/helper-sk-select-reuseport.c    |  16 +
 .../gcc.target/bpf/helper-sk-storage-delete.c      |  14 +
 .../gcc.target/bpf/helper-sk-storage-get.c         |  16 +
 .../gcc.target/bpf/helper-skb-adjust-room.c        |  17 +
 .../gcc.target/bpf/helper-skb-cgroup-id.c          |  14 +
 .../gcc.target/bpf/helper-skb-change-head.c        |  16 +
 .../gcc.target/bpf/helper-skb-change-proto.c       |  16 +
 .../gcc.target/bpf/helper-skb-change-tail.c        |  16 +
 .../gcc.target/bpf/helper-skb-change-type.c        |  15 +
 .../gcc.target/bpf/helper-skb-ecn-set-ce.c         |  14 +
 .../gcc.target/bpf/helper-skb-get-tunnel-key.c     |  16 +
 .../gcc.target/bpf/helper-skb-get-tunnel-opt.c     |  16 +
 .../gcc.target/bpf/helper-skb-get-xfrm-state.c     |  17 +
 .../bpf/helper-skb-load-bytes-relative.c           |  17 +
 .../gcc.target/bpf/helper-skb-load-bytes.c         |  15 +
 .../gcc.target/bpf/helper-skb-pull-data.c          |  15 +
 .../gcc.target/bpf/helper-skb-set-tunnel-key.c     |  16 +
 .../gcc.target/bpf/helper-skb-set-tunnel-opt.c     |  16 +
 .../gcc.target/bpf/helper-skb-store-bytes.c        |  18 +
 .../gcc.target/bpf/helper-skb-under-cgroup.c       |  15 +
 gcc/testsuite/gcc.target/bpf/helper-skb-vlan-pop.c |  14 +
 .../gcc.target/bpf/helper-skb-vlan-push.c          |  16 +
 .../gcc.target/bpf/helper-skc-lookup-tcp.c         |  17 +
 .../gcc.target/bpf/helper-sock-hash-update.c       |  16 +
 .../gcc.target/bpf/helper-sock-map-update.c        |  16 +
 .../gcc.target/bpf/helper-sock-ops-cb-flags-set.c  |  16 +
 gcc/testsuite/gcc.target/bpf/helper-spin-lock.c    |  13 +
 gcc/testsuite/gcc.target/bpf/helper-spin-unlock.c  |  13 +
 gcc/testsuite/gcc.target/bpf/helper-strtol.c       |  18 +
 gcc/testsuite/gcc.target/bpf/helper-strtoul.c      |  18 +
 .../bpf/helper-sysctl-get-current-value.c          |  17 +
 .../gcc.target/bpf/helper-sysctl-get-name.c        |  18 +
 .../gcc.target/bpf/helper-sysctl-get-new-value.c   |  17 +
 .../gcc.target/bpf/helper-sysctl-set-new-value.c   |  17 +
 gcc/testsuite/gcc.target/bpf/helper-tail-call.c    |  14 +
 .../gcc.target/bpf/helper-tcp-check-syncookie.c    |  17 +
 gcc/testsuite/gcc.target/bpf/helper-tcp-sock.c     |  13 +
 gcc/testsuite/gcc.target/bpf/helper-trace-printk.c |  13 +
 .../gcc.target/bpf/helper-xdp-adjust-head.c        |  15 +
 .../gcc.target/bpf/helper-xdp-adjust-meta.c        |  15 +
 .../gcc.target/bpf/helper-xdp-adjust-tail.c        |  15 +
 .../gcc.target/bpf/skb-ancestor-cgroup-id.c        |  16 +
 gcc/testsuite/gcc.target/bpf/sync-fetch-and-add.c  |  14 +
 gcc/testsuite/lib/target-supports.exp              |  26 +-
 libgcc/ChangeLog                                   |   7 +
 libgcc/config.host                                 |   7 +
 libgcc/config/bpf/crti.S                           |   0
 libgcc/config/bpf/crtn.S                           |   0
 libgcc/config/bpf/t-bpf                            |  23 +
 308 files changed, 5954 insertions(+), 98 deletions(-)
 create mode 100644 gcc/common/config/bpf/bpf-common.c
 create mode 100644 gcc/config/bpf/bpf-helpers.def
 create mode 100644 gcc/config/bpf/bpf-helpers.h
 create mode 100644 gcc/config/bpf/bpf-opts.h
 create mode 100644 gcc/config/bpf/bpf-protos.h
 create mode 100644 gcc/config/bpf/bpf.c
 create mode 100644 gcc/config/bpf/bpf.h
 create mode 100644 gcc/config/bpf/bpf.md
 create mode 100644 gcc/config/bpf/bpf.opt
 create mode 100644 gcc/config/bpf/constraints.md
 create mode 100644 gcc/config/bpf/predicates.md
 create mode 100644 gcc/config/bpf/t-bpf
 create mode 100644 gcc/testsuite/gcc.target/bpf/bpf.exp
 create mode 100644 gcc/testsuite/gcc.target/bpf/builtin-load.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/constant-calls.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/diag-funargs-2.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/diag-funargs-3.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/diag-funargs.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/diag-indcalls.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-bind.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-bpf-redirect.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-clone-redirect.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-csum-diff.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-csum-update.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-current-task-under-cgroup.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-fib-lookup.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-get-cgroup-classid.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-get-current-cgroup-id.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-get-current-comm.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-get-current-pid-tgid.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-get-current-task.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-get-current-uid-gid.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-get-hash-recalc.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-get-listener-sock.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-get-local-storage.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-get-numa-node-id.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-get-prandom-u32.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-get-route-realm.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-get-smp-processor-id.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-get-socket-cookie.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-get-socket-uid.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-get-stack.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-get-stackid.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-getsockopt.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-ktime-get-ns.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-l3-csum-replace.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-l4-csum-replace.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-lwt-push-encap.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-lwt-seg6-action.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-lwt-seg6-adjust-srh.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-lwt-seg6-store-bytes.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-map-delete-elem.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-map-lookup-elem.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-map-peek-elem.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-map-pop-elem.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-map-push-elem.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-map-update-elem.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-msg-apply-bytes.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-msg-cork-bytes.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-msg-pop-data.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-msg-pull-data.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-msg-push-data.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-msg-redirect-hash.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-msg-redirect-map.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-override-return.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-perf-event-output.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-perf-event-read-value.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-perf-event-read.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-perf-prog-read-value.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-probe-read-str.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-probe-read.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-probe-write-user.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-rc-keydown.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-rc-pointer-rel.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-rc-repeat.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-redirect-map.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-set-hash-invalid.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-set-hash.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-setsockopt.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-sk-fullsock.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-sk-lookup-tcp.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-sk-lookup-upd.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-sk-redirect-hash.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-sk-redirect-map.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-sk-release.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-sk-select-reuseport.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-sk-storage-delete.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-sk-storage-get.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-adjust-room.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-cgroup-id.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-change-head.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-change-proto.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-change-tail.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-change-type.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-ecn-set-ce.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-get-tunnel-key.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-get-tunnel-opt.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-get-xfrm-state.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-load-bytes-relative.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-load-bytes.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-pull-data.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-set-tunnel-key.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-set-tunnel-opt.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-store-bytes.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-under-cgroup.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-vlan-pop.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skb-vlan-push.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-skc-lookup-tcp.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-sock-hash-update.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-sock-map-update.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-sock-ops-cb-flags-set.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-spin-lock.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-spin-unlock.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-strtol.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-strtoul.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-sysctl-get-current-value.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-sysctl-get-name.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-sysctl-get-new-value.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-sysctl-set-new-value.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-tail-call.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-tcp-check-syncookie.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-tcp-sock.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-trace-printk.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-xdp-adjust-head.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-xdp-adjust-meta.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/helper-xdp-adjust-tail.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/skb-ancestor-cgroup-id.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/sync-fetch-and-add.c
 create mode 100644 libgcc/config/bpf/crti.S
 create mode 100644 libgcc/config/bpf/crtn.S
 create mode 100644 libgcc/config/bpf/t-bpf

-- 
2.11.0


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