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From: Peter Maydell <>
Cc: "Alex Bennée" <>,
	"Richard Henderson" <>,
	"Philippe Mathieu-Daudé" <>,
	"Liviu Ionescu" <>
Subject: [PATCH 2/2] semihosting/config: Merge --semihosting-config option groups
Date: Thu, 26 May 2022 20:00:53 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Currently we mishandle the --semihosting-config option if the
user specifies it on the command line more than once. For
example with:
 --semihosting-config target=gdb --semihosting-config arg=foo,arg=bar

the function qemu_semihosting_config_options() is called twice, once
for each argument.  But that function expects to be called only once,
and it always unconditionally sets the semihosting.enabled,
semihost_chardev and variables.  This means that
if any of those options were set anywhere except the last
--semihosting-config option on the command line, those settings are
ignored.  In the example above, 'target=gdb' in the first option is
overridden by an implied default 'target=auto' in the second.

The QemuOptsList machinery has a flag for handling this kind of
"option group is setting global state": by setting
 .merge_lists = true;
we make the machinery merge all the --semihosting-config arguments
the user passes into a single set of options and call our
qemu_semihosting_config_options() just once.

Signed-off-by: Peter Maydell <>
 semihosting/config.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/semihosting/config.c b/semihosting/config.c
index 50d82108e6e..3afacf54ab2 100644
--- a/semihosting/config.c
+++ b/semihosting/config.c
@@ -27,6 +27,7 @@
 QemuOptsList qemu_semihosting_config_opts = {
     .name = "semihosting-config",
+    .merge_lists = true,
     .implied_opt_name = "enable",
     .head = QTAILQ_HEAD_INITIALIZER(qemu_semihosting_config_opts.head),
     .desc = {

  parent reply	other threads:[~2022-05-26 19:03 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-26 19:00 [PATCH 0/2] gdbstub: don't crash if no gdb attached and gdb syscall attempted Peter Maydell
2022-05-26 19:00 ` [PATCH 1/2] gdbstub: Don't use GDB syscalls if no GDB is attached Peter Maydell
2022-05-29 11:06   ` Philippe Mathieu-Daudé via
2022-06-09 20:01   ` Luc Michel
2022-05-26 19:00 ` Peter Maydell [this message]
2022-06-09 20:02   ` [PATCH 2/2] semihosting/config: Merge --semihosting-config option groups Luc Michel
2022-06-10 13:04 ` [PATCH 0/2] gdbstub: don't crash if no gdb attached and gdb syscall attempted Peter Maydell
2022-06-10 14:40   ` Alex Bennée

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