[Xen-changelog] [xen staging] tools/kdd: work around gcc 8.1 bug

[patchbot@xxxxxxx]

commit 48a70499e6bf0f9742fd2d79cd8db5ec674213e2
Author:     Wei Liu <wei.liu2@xxxxxxxxxx>
AuthorDate: Mon Aug 6 11:35:18 2018 +0100
Commit:     Wei Liu <wei.liu2@xxxxxxxxxx>
CommitDate: Mon Aug 20 11:49:46 2018 +0100

    tools/kdd: work around gcc 8.1 bug
    
    Gcc 8.1 has a bug that causes kdd fail to build. Rewrite the code to
    work around that bug.
    
    https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86827
    
    Signed-off-by: Tim Deegan <tim@xxxxxxx>
    Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
    Tested-by: Wei Liu <wei.liu2@xxxxxxxxxx>
    Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
 tools/debugger/kdd/kdd.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/tools/debugger/kdd/kdd.c b/tools/debugger/kdd/kdd.c
index 5a019a0a0c..fb8c645355 100644
--- a/tools/debugger/kdd/kdd.c
+++ b/tools/debugger/kdd/kdd.c
@@ -687,11 +687,10 @@ static void kdd_handle_read_ctrl(kdd_state *s)
         }
     } else {
         /* 32-bit control-register space starts at 0x[2]cc, for 84 bytes */
-        uint32_t offset = addr;
-        if (offset > 0x200)
-            offset -= 0x200;
-        offset -= 0xcc;
-        if (offset > sizeof ctrl.c32 || offset + len > sizeof ctrl.c32) {
+        uint32_t offset = addr - 0xcc;
+        if (offset > sizeof ctrl.c32)
+            offset -= 0x2cc;
+        if (offset > sizeof ctrl.c32 || len > sizeof ctrl.c32 - offset) {
             KDD_LOG(s, "Request outside of known control space\n");
             len = 0;
         } else {
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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