[V2,0/2] eBPF support

Message ID 20200703114950.9546-1-jose.marchesi@oracle.com
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  • eBPF support
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Simon Marchi via Gdb-patches July 3, 2020, 11:49 a.m.
[Changes from V1:
- The second patch was way too big and put in moderation by mailman.
  This version removes thunks of generated autotools files to reduce
  patch size.]

Hi good peoples!

This patch series adds support for the eBPF virtual architecture to
GDB [1].

The first patch contains the basic bits to GDB in order to support the
bpf-unknown-none target.  Breakpointing and instruction
single-stepping works, but the debugging support in eBPF is still very
minimal.  This is mainly due to the many limitations imposed by the
architecture (disjoint stack, maximum stack size, etc).  We are
working to overcome these limitations, by introducing a variant called
xbpf, already supported in GCC with the -mxbpf option, whose purpose
is to ease debugging and to be used in other contexts different than
the Linux kernel, less restrictive.

The second patch adds a basic CGEN-based instruction simulator for
eBPF.  It can run many eBPF programs and works well with GDB.  A
testsuite covering the supported instructions is also included.  We
will be expanding it in order to emulate the several kernel contexts
in which eBPF programs can run, so eBPF developers can use GDB to
debug their programs without having to load them in a running kernel.
Currently the only kernel helper implemented in the simulator is
printk, which is used by the tests.

We of course commit to maintain and evolve this stuff :)

[1] Support for eBPF has been already added to both binutils and GCC.

Jose E. Marchesi (2):
  gdb: support for eBPF
  sim: eBPF simulator

 gdb/ChangeLog                       |    10 +
 gdb/Makefile.in                     |     3 +
 gdb/bpf-tdep.c                      |   331 +
 gdb/bpf-tdep.h                      |    46 +
 gdb/configure.tgt                   |     6 +
 gdb/doc/ChangeLog                   |     6 +
 gdb/doc/gdb.texinfo                 |    21 +
 sim/ChangeLog                       |    36 +
 sim/MAINTAINERS                     |     1 +
 sim/bpf/Makefile.in                 |   205 +
 sim/bpf/aclocal.m4                  |   119 +
 sim/bpf/arch.c                      |    35 +
 sim/bpf/arch.h                      |    50 +
 sim/bpf/bpf-helpers.c               |   175 +
 sim/bpf/bpf-helpers.def             |   194 +
 sim/bpf/bpf-helpers.h               |    31 +
 sim/bpf/bpf-sim.h                   |    31 +
 sim/bpf/bpf.c                       |   327 +
 sim/bpf/config.in                   |   248 +
 sim/bpf/configure                   | 15942 ++++++++++++++++++++++++++
 sim/bpf/configure.ac                |    13 +
 sim/bpf/cpu.c                       |    69 +
 sim/bpf/cpu.h                       |    81 +
 sim/bpf/cpuall.h                    |    65 +
 sim/bpf/decode-be.c                 |  1129 ++
 sim/bpf/decode-be.h                 |    94 +
 sim/bpf/decode-le.c                 |  1129 ++
 sim/bpf/decode-le.h                 |    94 +
 sim/bpf/decode.h                    |    37 +
 sim/bpf/defs-be.h                   |   383 +
 sim/bpf/defs-le.h                   |   383 +
 sim/bpf/eng.h                       |    24 +
 sim/bpf/mloop.in                    |   165 +
 sim/bpf/sem-be.c                    |  3207 ++++++
 sim/bpf/sem-le.c                    |  3207 ++++++
 sim/bpf/sim-if.c                    |   216 +
 sim/bpf/sim-main.h                  |    51 +
 sim/bpf/traps.c                     |    33 +
 sim/configure                       |    22 +-
 sim/configure.tgt                   |     3 +
 sim/testsuite/ChangeLog             |    17 +
 sim/testsuite/configure             |    23 +-
 sim/testsuite/sim/bpf/allinsn.exp   |    26 +
 sim/testsuite/sim/bpf/alu.s         |   109 +
 sim/testsuite/sim/bpf/alu32.s       |    99 +
 sim/testsuite/sim/bpf/endbe.s       |    46 +
 sim/testsuite/sim/bpf/endle.s       |    43 +
 sim/testsuite/sim/bpf/jmp.s         |   120 +
 sim/testsuite/sim/bpf/jmp32.s       |   120 +
 sim/testsuite/sim/bpf/ldabs.s       |    87 +
 sim/testsuite/sim/bpf/mem.s         |    56 +
 sim/testsuite/sim/bpf/mov.s         |    54 +
 sim/testsuite/sim/bpf/testutils.inc |    38 +
 sim/testsuite/sim/bpf/xadd.s        |    44 +
 54 files changed, 29099 insertions(+), 5 deletions(-)
 create mode 100644 gdb/bpf-tdep.c
 create mode 100644 gdb/bpf-tdep.h
 create mode 100644 sim/bpf/Makefile.in
 create mode 100644 sim/bpf/aclocal.m4
 create mode 100644 sim/bpf/arch.c
 create mode 100644 sim/bpf/arch.h
 create mode 100644 sim/bpf/bpf-helpers.c
 create mode 100644 sim/bpf/bpf-helpers.def
 create mode 100644 sim/bpf/bpf-helpers.h
 create mode 100644 sim/bpf/bpf-sim.h
 create mode 100644 sim/bpf/bpf.c
 create mode 100644 sim/bpf/config.in
 create mode 100755 sim/bpf/configure
 create mode 100644 sim/bpf/configure.ac
 create mode 100644 sim/bpf/cpu.c
 create mode 100644 sim/bpf/cpu.h
 create mode 100644 sim/bpf/cpuall.h
 create mode 100644 sim/bpf/decode-be.c
 create mode 100644 sim/bpf/decode-be.h
 create mode 100644 sim/bpf/decode-le.c
 create mode 100644 sim/bpf/decode-le.h
 create mode 100644 sim/bpf/decode.h
 create mode 100644 sim/bpf/defs-be.h
 create mode 100644 sim/bpf/defs-le.h
 create mode 100644 sim/bpf/eng.h
 create mode 100644 sim/bpf/mloop.in
 create mode 100644 sim/bpf/sem-be.c
 create mode 100644 sim/bpf/sem-le.c
 create mode 100644 sim/bpf/sim-if.c
 create mode 100644 sim/bpf/sim-main.h
 create mode 100644 sim/bpf/traps.c
 create mode 100644 sim/testsuite/sim/bpf/allinsn.exp
 create mode 100644 sim/testsuite/sim/bpf/alu.s
 create mode 100644 sim/testsuite/sim/bpf/alu32.s
 create mode 100644 sim/testsuite/sim/bpf/endbe.s
 create mode 100644 sim/testsuite/sim/bpf/endle.s
 create mode 100644 sim/testsuite/sim/bpf/jmp.s
 create mode 100644 sim/testsuite/sim/bpf/jmp32.s
 create mode 100644 sim/testsuite/sim/bpf/ldabs.s
 create mode 100644 sim/testsuite/sim/bpf/mem.s
 create mode 100644 sim/testsuite/sim/bpf/mov.s
 create mode 100644 sim/testsuite/sim/bpf/testutils.inc
 create mode 100644 sim/testsuite/sim/bpf/xadd.s

-- 
2.25.0.2.g232378479e