Use sysctl to fetch the vm map of the current process.
Signed-off-by: Richard Henderson <[email protected]>
---
common-user/selfmap.c | 45 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 44 insertions(+), 1 deletion(-)
diff --git a/common-user/selfmap.c b/common-user/selfmap.c
index a1b88dee66..139dae15e8 100644
--- a/common-user/selfmap.c
+++ b/common-user/selfmap.c
@@ -9,6 +9,10 @@
#include "qemu/osdep.h"
#include "qemu/cutils.h"
#include "user/selfmap.h"
+#ifdef __FreeBSD__
+#include <sys/sysctl.h>
+#include <sys/user.h>
+#endif
IntervalTreeRoot *read_self_maps(void)
{
@@ -80,9 +84,48 @@ IntervalTreeRoot *read_self_maps(void)
g_strfreev(lines);
g_free(maps);
+ return root;
+#elif defined(__FreeBSD__)
+ int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_VMMAP, getpid() };
+ size_t len = 0;
+ g_autofree void *buf = NULL;
+ IntervalTreeRoot *root;
+
+ /* Probe for buffer size. */
+ if (sysctl(mib, ARRAY_SIZE(mib), NULL, &len, NULL, 0) < 0) {
+ return NULL;
+ }
+
+ buf = g_malloc(len);
+ if (sysctl(mib, ARRAY_SIZE(mib), buf, &len, NULL, 0) < 0) {
+ return NULL;
+ }
+
+ root = g_new0(IntervalTreeRoot, 1);
+
+ for (size_t i = 0; i < len; ) {
+ struct kinfo_vmentry *k = buf + i;
+ MapInfo *e = g_new0(MapInfo, 1);
+
+ e->itree.start = k->kve_start;
+ e->itree.last = k->kve_end - 1;
+
+ /*
+ * TODO: The rest of the fields in MapInfo are used by linux-user
+ * for the implementation of open_self_maps(). These fields are
+ * quite specific to the textual format of /proc/self/maps.
+ *
+ * We may need something different to emulate KERN_PROC_VMMAP
+ * in bsd-user, but so far they're unused -- leave them zeroed.
+ */
+
+ interval_tree_insert(&e->itree, root);
+ i += k->kve_structsize;
+ }
+
return root;
#else
- return NULL;
+# error
#endif
}
--
2.43.0
