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[Qemu-devel] [PATCH 2/5] configure: Don't allow user-only targets for un
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PATCH 2/5] configure: Don't allow user-only targets for unknown CPU architectures |
Date: |
Tue, 14 Jun 2016 10:52:04 +0100 |
For the user-only targets, we need to know something about the host CPU
architecture even if we are using the TCI interpreter rather than TCG.
(In particular user-exec.c has code for handling signals that needs
to know about that host's context structures.)
Specifically forbid building the user-only targets on unknown CPU
architectures, rather than allowing them to configure but then fail
when building user-exec.c.
This change drops supports for two configurations which were theoretically
possible before:
* linux-user targets on M68K hosts using TCI
* linux-user targets on HPPA hosts using TCI
We don't think anybody is actually trying to use these in practice, though:
* interpreted TCG on a slow host CPU would be unusably slow
* the m68k user-exec.c support is missing is_write detection so guest
code which writes to the same page it is executing from was broken
(will include any guest program using signals)
* HPPA TCG backend support was dropped two and a half years ago
with no complaints
Signed-off-by: Peter Maydell <address@hidden>
---
configure | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/configure b/configure
index 7ab4e0b..62f93e3 100755
--- a/configure
+++ b/configure
@@ -1217,6 +1217,13 @@ esac
QEMU_CFLAGS="$CPU_CFLAGS $QEMU_CFLAGS"
EXTRA_CFLAGS="$CPU_CFLAGS $EXTRA_CFLAGS"
+# For user-mode emulation the host arch has to be one we explicitly
+# support, even if we're using TCI.
+if [ "$ARCH" = "unknown" ]; then
+ bsd_user="no"
+ linux_user="no"
+fi
+
default_target_list=""
mak_wilds=""
--
1.9.1