linux-kernel - [PATCH 1/4] scripts/gdb: Find vmlinux where it was before

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Date:   Mon, 25 Mar 2019 11:45:19 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Douglas Anderson <dianders@...omium.org>,
        Nikolay Borisov <n.borisov.lkml@...il.com>,
        Kieran Bingham <kbingham@...nel.org>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Jackie Liu <liuyun01@...inos.cn>
Subject: [PATCH 1/4] scripts/gdb: Find vmlinux where it was before

If I run 'gdb <path/to/vmlinux>' and there's the vmlinux-gdb.py file
there I can properly see symbols and use the lx commands provided by the
GDB scripts. But once I run 'lx-symbols' at the command prompt, gdb
reloads the vmlinux symbols assuming that this script was run from the
directory that has vmlinux at the root. That isn't always true, but we
could just look and see what symbols were already loaded and use that
instead. Let's do that so this can work by being invoked anywhere.

Cc: Douglas Anderson <dianders@...omium.org>
Cc: Nikolay Borisov <n.borisov.lkml@...il.com>
Cc: Kieran Bingham <kbingham@...nel.org>
Cc: Jan Kiszka <jan.kiszka@...mens.com>
Cc: Jackie Liu <liuyun01@...inos.cn> 
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
---
 scripts/gdb/linux/symbols.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/scripts/gdb/linux/symbols.py b/scripts/gdb/linux/symbols.py
index 004b0ac7fa72..2f5b95f09fa0 100644
--- a/scripts/gdb/linux/symbols.py
+++ b/scripts/gdb/linux/symbols.py
@@ -139,8 +139,12 @@ lx-symbols command."""
                 saved_states.append({'breakpoint': bp, 'enabled': bp.enabled})
 
         # drop all current symbols and reload vmlinux
+        orig_vmlinux = 'vmlinux'
+        for obj in gdb.objfiles():
+            if obj.filename.endswith('vmlinux'):
+                orig_vmlinux = obj.filename
         gdb.execute("symbol-file", to_string=True)
-        gdb.execute("symbol-file vmlinux")
+        gdb.execute("symbol-file {0}".format(orig_vmlinux))
 
         self.loaded_modules = []
         module_list = modules.module_list()
-- 
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