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

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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: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20230417164041.684562-5-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2023-04-17 17:40:35 +01:00
parent 0e33928cd9
commit e99c1f89b2
2 changed files with 12 additions and 4 deletions
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7
docs/user/main.rst
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@ -93,8 +93,13 @@ Debug options:
``-g port``
Wait gdb connection to port
``-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.
Environment variables:

9
linux-user/main.c
View File

@ -409,7 +409,7 @@ static void handle_arg_reserved_va(const char *arg)
reserved_va = val ? val - 1 : 0;
}
static void handle_arg_singlestep(const char *arg)
static void handle_arg_one_insn_per_tb(const char *arg)
{
opt_one_insn_per_tb = true;
}
@ -500,8 +500,11 @@ static const struct qemu_argument arg_table[] = {
"logfile", "write logs to 'logfile' (default stderr)"},
{"p", "QEMU_PAGESIZE", true, handle_arg_pagesize,
"pagesize", "set the host page size to 'pagesize'"},
{"singlestep", "QEMU_SINGLESTEP", false, handle_arg_singlestep,
"", "run in singlestep mode"},
{"one-insn-per-tb",
"QEMU_ONE_INSN_PER_TB", false, handle_arg_one_insn_per_tb,
"", "run with one guest instruction per emulated TB"},
{"singlestep", "QEMU_SINGLESTEP", false, handle_arg_one_insn_per_tb,
"", "deprecated synonym for -one-insn-per-tb"},
{"strace", "QEMU_STRACE", false, handle_arg_strace,
"", "log system calls"},
{"seed", "QEMU_RAND_SEED", true, handle_arg_seed,