gdbsx: update README and remove space in q packet

Newer version of gdb, version 7*, seems to have bug where it is not
parsing thread list from gdbsx properly. Getting rid of the space in
thread list works around it. It's ok with older gdb also.

Signed-off-by: Mukesh Rathor <mukesh.rathor@oracle.com>

2 files changed, 6 insertions, 6 deletions

diff --git a/tools/debugger/gdbsx/README b/tools/debugger/gdbsx/README
index ac01add93c..0ac229924c 100644
--- a/tools/debugger/gdbsx/README
+++ b/tools/debugger/gdbsx/README
@@ -26,7 +26,7 @@ USAGE:
       bash> gdb ./vmlinux             (exact matching vmlinux of guest kernel)
       (gdb) target remote dom0:9999 
 
-   - Additionally, to debug loadable kernel modules, please do following:
+   - Additionally, to debug 32bit loadable kernel modules, please do following:
       (gdb) p init_mm.pgd[3]
       $1 = {pgd = 0x1b874f027}
       (gdb) monitor pgd3 0x1b874f027  (Make sure value is in HEX)
diff --git a/tools/debugger/gdbsx/gx/gx_main.c b/tools/debugger/gdbsx/gx/gx_main.c
index 07923af973..e3feee1443 100644
--- a/tools/debugger/gdbsx/gx/gx_main.c
+++ b/tools/debugger/gdbsx/gx/gx_main.c
@@ -132,12 +132,12 @@ _do_qRcmd_req(char *remote_buf)
 static void
 process_q_request(char *remote_buf)
 {
-    /* send a list of tids: "m 0,1,2,3l" */
+    /* send a list of tids: "m0,1,2,3l" */
     if (strcmp("qfThreadInfo", remote_buf) == 0) {
         vcpuid_t vid = 0;
         char *p = remote_buf;
 
-        sprintf(p, "m %x", vid);        /* puts null char at the end */
+        sprintf(p, "m%x", vid);        /* puts null char at the end */
         p = p + strlen(p);
         for (vid=1; vid <= max_vcpuid; vid++) {
             sprintf(p, ",%x", vid);
@@ -146,8 +146,9 @@ process_q_request(char *remote_buf)
         sprintf(p, "l");                /* puts null char at the end */
         return;
     }
+
     /* qSymbol works for init_mm, and not init_mm.pgd, hence we can't use
-         * it at this time. instead use "monitor" in gdb */
+     * it at this time. instead use "monitor" in gdb */
     if (strncmp("qRcmd,", remote_buf, 6) == 0) {
         _do_qRcmd_req(remote_buf);
         return;
@@ -155,8 +156,7 @@ process_q_request(char *remote_buf)
 
     /* TBD : qThreadExtraInfo : send extra banner info  */
 
-        /* nothing else supported right now */
-    remote_buf[0] = '\0';
+    remote_buf[0] = '\0';              /* nothing else supported for now */
 
     return;
 }