[PATCH V4 0/3] eBPF support
Jose E. Marchesi
jose.marchesi@oracle.com
Fri Jul 10 12:25:27 GMT 2020
[Changes from V3:
- Rebased to today's master.
- Change eBPF instances to BPF.
- Use fprintf_unfiltered instead of bpf_debug.
- Remove bpf_debug.
- Remove unneedded bpf_unwind_pc.
- Added missing top-level comments to bpf-tdep.c.
- Turn ebpf_debug_flag into 'set debug bpf'.
- Turn XXX comments into more useful comments, or assertions.
- Do not use pointers as bools, compare them to NULL instead.
- Regenerate with non-Debian autoconf to avoid spurious changes.
- Several minor cosmetic changes.]
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 (3):
gdb: support for eBPF
sim: eBPF simulator
sim: generated files for the eBPF simulator
gdb/ChangeLog | 10 +
gdb/Makefile.in | 3 +
gdb/bpf-tdep.c | 349 +
gdb/bpf-tdep.h | 45 +
gdb/configure.tgt | 6 +
gdb/doc/ChangeLog | 6 +
gdb/doc/gdb.texinfo | 21 +
sim/ChangeLog | 42 +
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 | 8 +
sim/configure.tgt | 3 +
sim/testsuite/ChangeLog | 17 +
sim/testsuite/configure | 9 +-
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, 29096 insertions(+), 3 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
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