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Thu, 13 Mar 2025 06:52:22 -0700 (PDT) Message-ID: Date: Thu, 13 Mar 2025 14:52:21 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: [PATCH 1/6] symbols: add minimal self-test From: Jan Beulich To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , Julien Grall , Stefano Stabellini , Anthony PERARD , Michal Orzel , =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= References: <58b3d7dc-5966-432c-8def-e841feaee1c8@suse.com> Content-Language: en-US Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: <58b3d7dc-5966-432c-8def-e841feaee1c8@suse.com> Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1741873959402019000 Content-Type: text/plain; charset="utf-8" ... before making changes to the involved logic. Signed-off-by: Jan Beulich --- With this FAST_SYMBOL_LOOKUP may make sense to permit enabling even when LIVEPATCH=3Dn. 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; } =20 +#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 =3D 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 use= d. */ + symname =3D strchr(name, '#'); + symname =3D symname ? symname + 1 : name; + if ( strcmp(symname, expected) ) + panic("%s: unexpected symbol name: '%s'\n", expected, symname); + + offs =3D symbols_lookup_by_name(name); + if ( offs !=3D 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