bsd-user: Add '-one-insn-per-tb' option equivalent to '-singlestep'

The '-singlestep' option is confusing, because it doesn't actually
have anything to do with single-stepping the CPU. What it does do
is force TCG emulation to put one guest instruction in each TB,
which can be useful in some situations.

Create a new command line argument -one-insn-per-tb, so we can
document that -singlestep is just a deprecated synonym for it,
and eventually perhaps drop it.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20230417164041.684562-6-peter.maydell@linaro.org

1 files changed, 6 insertions, 1 deletions

diff --git a/docs/user/main.rst b/docs/user/main.rst
index f9ac701f4b..f478635396 100644
--- a/docs/user/main.rst
+++ b/docs/user/main.rst
@@ -247,5 +247,10 @@ Debug options:
 ``-p pagesize``
    Act as if the host page size was 'pagesize' bytes
 
+``-one-insn-per-tb``
+   Run the emulation with one guest instruction per translation block.
+   This slows down emulation a lot, but can be useful in some situations,
+   such as when trying to analyse the logs produced by the ``-d`` option.
+
 ``-singlestep``
-   Run the emulation in single step mode.
+   This is a deprecated synonym for the ``-one-insn-per-tb`` option.