Commit Graph

9 Commits

Author SHA1 Message Date
Richard Henderson
6fcc02292c plugins: Drop unused headers from exec/plugin-gen.h
Two headers are not required for the rest of the
contents of plugin-gen.h.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-06-05 12:04:29 -07:00
Richard Henderson
bc54ef8c6a plugins: Move plugin_insn_append to translator.c
This function is only used in translator.c, and uses a
target-specific typedef: abi_ptr.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-06-05 12:04:29 -07:00
Richard Henderson
fcdab382c8 accel/tcg: Widen plugin_gen_empty_mem_callback to i64
Since we do this inside gen_empty_mem_cb anyway, let's
do this earlier inside tcg expansion.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-05-16 16:30:29 -07:00
Markus Armbruster
7a5951f651 include: Include headers where needed
A number of headers neglect to include everything they need.  They
compile only if the headers they need are already included from
elsewhere.  Fix that.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20221222120813.727830-3-armbru@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2023-01-08 01:54:22 -05:00
Richard Henderson
b21af662c1 accel/tcg: Use DisasContextBase in plugin_gen_tb_start
Use the pc coming from db->pc_first rather than the TB.

Use the cached host_addr rather than re-computing for the
first page.  We still need a separate lookup for the second
page because it won't be computed for DisasContextBase until
the translator actually performs a read from the page.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2022-10-03 20:53:31 -07:00
Alex Bennée
357af9be5c plugins: try and make plugin_insn_append more ergonomic
Currently we make the assumption that the guest frontend loads all
op code bytes sequentially. This mostly holds up for regular fixed
encodings but some architectures like s390x like to re-read the
instruction which causes weirdness to occur. Rather than changing the
frontends make the plugin API a little more ergonomic and able to
handle the re-read case.

Stuff will still get strange if we read ahead of the opcode but so far
no front ends have done that and this patch asserts the case so we can
catch it early if they do.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20211026102234.3961636-21-alex.bennee@linaro.org>
2021-11-04 10:32:01 +00:00
Alex Bennée
cfd405eae6 accel/tcg: allow plugin instrumentation to be disable via cflags
When icount is enabled and we recompile an MMIO access we end up
double counting the instruction execution. To avoid this we introduce
the CF_MEMI cflag which only allows memory instrumentation for the
next TB (which won't yet have been counted). As this is part of the
hashed compile flags we will only execute the generated TB while
coming out of a cpu_io_recompile.

While we are at it delete the old TODO. We might as well keep the
translation handy as it's likely you will repeatedly hit it on each
MMIO access.

Reported-by: Aaron Lindsay <aaron@os.amperecomputing.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Aaron Lindsay <aaron@os.amperecomputing.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210213130325.14781-21-alex.bennee@linaro.org>
2021-02-18 08:19:23 +00:00
Emilio G. Cota
763f7e1209 plugin-gen: add plugin_insn_append
By adding it to plugin-gen's header file, we can export is as
an inline, since tcg.h is included in the header (we need tcg_ctx).

Signed-off-by: Emilio G. Cota <cota@braap.org>
[AJB: use g_byte_array]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2019-10-28 15:12:38 +00:00
Emilio G. Cota
38b47b19ec plugin-gen: add module for TCG-related code
We first inject empty instrumentation from translator_loop.
After translation, we go through the plugins to see what
they want to register for, filling in the empty instrumentation.
If if turns out that some instrumentation remains unused, we
remove it.

This approach supports the following features:

- Inlining TCG code for simple operations. Note that we do not
  export TCG ops to plugins. Instead, we give them a C API to
  insert inlined ops. So far we only support adding an immediate
  to a u64, e.g. to count events.

- "Direct" callbacks. These are callbacks that do not go via
  a helper. Instead, the helper is defined at run-time, so that
  the plugin code is directly called from TCG. This makes direct
  callbacks as efficient as possible; they are therefore used
  for very frequent events, e.g. memory callbacks.

- Passing the host address to memory callbacks. Most of this
  is implemented in a later patch though.

- Instrumentation of memory accesses performed from helpers.
  See the corresponding comment, as well as a later patch.

Signed-off-by: Emilio G. Cota <cota@braap.org>
[AJB: add alloc_tcg_plugin_context, use glib, rm hwaddr]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2019-10-28 15:12:38 +00:00