Since OpenBSD 6.0 [1], W^X is enforced by default [2].
TCG requires WX access. Disable W^X if it is available.
This fixes:
# lm32-softmmu/qemu-system-lm32
Could not allocate dynamic translator buffer
# sysctl kern.wxabort=1
kern.wxabort: 0 -> 1
# lm32-softmmu/qemu-system-lm32
mmap: Not supported
Abort trap (core dumped)
# gdb -q lm32-softmmu/qemu-system-lm32 qemu-system-lm32.core
(gdb) bt
#0 0x000017e3c156c50a in _thread_sys___syscall () at {standard input}:5
#1 0x000017e3c15e5d7a in *_libc_mmap (addr=Variable "addr" is not
available.) at /usr/src/lib/libc/sys/mmap.c:47
#2 0x000017e17d9abc8b in alloc_code_gen_buffer () at
/usr/src/qemu/accel/tcg/translate-all.c:1064
#3 0x000017e17d9abd04 in code_gen_alloc (tb_size=0) at
/usr/src/qemu/accel/tcg/translate-all.c:1112
#4 0x000017e17d9abe81 in tcg_exec_init (tb_size=0) at
/usr/src/qemu/accel/tcg/translate-all.c:1149
#5 0x000017e17d9897e9 in tcg_init (ms=0x17e45e456800) at
/usr/src/qemu/accel/tcg/tcg-all.c:66
#6 0x000017e17d9891b8 in accel_init_machine (acc=0x17e3c3f50800,
ms=0x17e45e456800) at /usr/src/qemu/accel/accel.c:63
#7 0x000017e17d989312 in configure_accelerator (ms=0x17e45e456800,
progname=0x7f7fffff07b0 "lm32-softmmu/qemu-system-lm32") at
/usr/src/qemu/accel/accel.c:111
#8 0x000017e17d9d8616 in main (argc=1, argv=0x7f7fffff06b8,
envp=0x7f7fffff06c8) at vl.c:4325
[1] https://www.openbsd.org/faq/upgrade60.html
[2] https://undeadly.org/cgi?action=article&sid=20160527203200
Signed-off-by: Philippe Mathieu-Daudé <phi...@redhat.com>
---
configure | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/configure b/configure
index b18281c61f..799ec2013b 100755
--- a/configure
+++ b/configure
@@ -5795,6 +5795,17 @@ if test "$mingw32" = "yes" ; then
done
fi
+# Disable OpenBSD W^X if available
+if test "$tcg" = "yes" -a "$targetos" = "OpenBSD"; then
+ cat > $TMPC <<EOF
+ int main(void) { return 0; }
+EOF
+ wx_ldflags="-Wl,-z,wxneeded"
+ if compile_prog "" "$wx_ldflags"; then
+ QEMU_LDFLAGS="$QEMU_LDFLAGS $wx_ldflags"
+ fi
+fi
+
qemu_confdir=$sysconfdir$confsuffix
qemu_moddir=$libdir$confsuffix
qemu_datadir=$datadir$confsuffix
--
2.20.1
