vmx(1): add support for (so far) crude 9p debugging fs; add gdb stub; clean up linux gdt code

1 files changed, 65 insertions, 0 deletions

diff --git a/sys/src/cmd/vmx/9p.c b/sys/src/cmd/vmx/9p.c
new file mode 100644
index 000000000..69cc744f2
--- /dev/null
+++ b/sys/src/cmd/vmx/9p.c
@@ -0,0 +1,65 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include <fcall.h>
+#include <9p.h>
+#include "dat.h"
+#include "fns.h"
+
+extern int regsfd;
+char Egreg[] = "the front fell off";
+
+enum {
+	Qregs,
+	Qmem,
+	Qmax
+};
+
+static Dir files[] = {
+	[Qregs] {.name "regs", .mode 0440},
+	[Qmem] {.name "mem", .mode 0440},
+};
+
+void
+srvread(Req *r)
+{
+	int rc;
+
+	switch(r->fid->qid.path){
+	case Qregs:
+		rc = pread(regsfd, r->ofcall.data, r->ifcall.count, r->ifcall.offset);
+		if(rc < 0)
+			responderror(r);
+		else{
+			r->ofcall.count = rc;
+			respond(r, nil);
+		}
+		break;
+	case Qmem:
+		r->ofcall.count = vmemread(r->ofcall.data, r->ifcall.count, r->ifcall.offset);
+		if(r->ofcall.count == 0)
+			respond(r, "fault");
+		else
+			respond(r, nil);
+		break;
+	default:
+		respond(r, Egreg);
+	}
+}
+
+Srv vmxsrv = {
+	.read srvread,
+};
+
+void
+init9p(char *srvname)
+{
+	char *uid;
+	int i;
+	
+	uid = getuser();
+	vmxsrv.tree = alloctree(uid, uid, 0770, nil);
+	for(i = 0; i < Qmax; i++)
+		createfile(vmxsrv.tree->root, files[i].name, uid, files[i].mode, nil);
+	threadpostmountsrv(&vmxsrv, srvname, nil, 0);
+}