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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
This commit is contained in:
Peter Maydell 2023-04-17 17:40:36 +01:00
parent e99c1f89b2
commit 060e0cd751
2 changed files with 9 additions and 3 deletions
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5
bsd-user/main.c
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@ -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;

7
docs/user/main.rst
View File

@ -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.