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, 3 insertions, 2 deletions

diff --git a/bsd-user/main.c b/bsd-user/main.c
index a9e5a127d3..cd8b2a670f 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -162,7 +162,8 @@ static void usage(void)
            "-d item1[,...]    enable logging of specified items\n"
            "                  (use '-d help' for a list of log items)\n"
            "-D logfile        write logs to 'logfile' (default stderr)\n"
-           "-singlestep       always run in singlestep mode\n"
+           "-one-insn-per-tb  run with one guest instruction per emulated TB\n"
+           "-singlestep       deprecated synonym for -one-insn-per-tb\n"
            "-strace           log system calls\n"
            "-trace            [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
            "                  specify tracing options\n"
@@ -385,7 +386,7 @@ int main(int argc, char **argv)
             (void) envlist_unsetenv(envlist, "LD_PRELOAD");
         } else if (!strcmp(r, "seed")) {
             seed_optarg = optarg;
-        } else if (!strcmp(r, "singlestep")) {
+        } else if (!strcmp(r, "singlestep") || !strcmp(r, "one-insn-per-tb")) {
             opt_one_insn_per_tb = true;
         } else if (!strcmp(r, "strace")) {
             do_strace = 1;