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[PATCH 1/6] symbols: add minimal self-test
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 13 Mar 2025 14:52:21 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 13 Mar 2025 13:52:26 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
... before making changes to the involved logic.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
With this FAST_SYMBOL_LOOKUP may make sense to permit enabling even
when LIVEPATCH=n. Thoughts? (In this case "symbols: centralize and re-
arrange $(all_symbols) calculation" would want pulling ahead.)
--- a/xen/common/symbols.c
+++ b/xen/common/symbols.c
@@ -260,6 +260,41 @@ unsigned long symbols_lookup_by_name(con
return 0;
}
+#ifdef CONFIG_SELF_TESTS
+
+static void __init test_lookup(unsigned long addr, const char *expected)
+{
+ char buf[KSYM_NAME_LEN + 1];
+ const char *name, *symname;
+ unsigned long size, offs;
+
+ name = symbols_lookup(addr, &size, &offs, buf);
+ if ( !name )
+ panic("%s: address not found\n", expected);
+ if ( offs )
+ panic("%s: non-zero offset (%#lx) unexpected\n", expected, offs);
+
+ /* Cope with static symbols, where varying file names/paths may be used. */
+ symname = strchr(name, '#');
+ symname = symname ? symname + 1 : name;
+ if ( strcmp(symname, expected) )
+ panic("%s: unexpected symbol name: '%s'\n", expected, symname);
+
+ offs = symbols_lookup_by_name(name);
+ if ( offs != addr )
+ panic("%s: address %#lx unexpected; wanted %#lx\n",
+ expected, offs, addr);
+}
+
+static void __init __constructor test_symbols(void)
+{
+ /* Be sure to only try this for cf_check functions. */
+ test_lookup((unsigned long)dump_execstate, "dump_execstate");
+ test_lookup((unsigned long)test_symbols, __func__);
+}
+
+#endif /* CONFIG_SELF_TESTS */
+
/*
* Local variables:
* mode: C
|