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From: "jan.kratochvil at redhat dot com" <sourceware-bugzilla@sourceware.org> To: glibc-bugs@sources.redhat.com Subject: [Bug libc/14166] New: invalid IFUNC DW_AT_linkage_name: memmove strstr time Date: Thu, 24 May 2012 19:56:00 -0000 [thread overview] Message-ID: <bug-14166-131@http.sourceware.org/bugzilla/> (raw) http://sourceware.org/bugzilla/show_bug.cgi?id=14166 Bug #: 14166 Summary: invalid IFUNC DW_AT_linkage_name: memmove strstr time Product: glibc Version: 2.15 Status: NEW Severity: normal Priority: P2 Component: libc AssignedTo: unassigned@sourceware.org ReportedBy: jan.kratochvil@redhat.com CC: drepper.fsp@gmail.com Classification: Unclassified Host: x86_64-unknown-linux-gnu Created attachment 6422 --> http://sourceware.org/bugzilla/attachment.cgi?id=6422 Broken fix attempt. $ ./gdb /lib64/libc.so.6 GNU gdb (GDB) 7.4.50.20120523-cvs (gdb) p memmove $1 = {<text gnu-indirect-function variable, no debug info>} 0x88a70 <memmove> (gdb) p memmove $2 = {void *(void)} 0x88a70 <memmove> DWARF has no way how to mark a function as IFUNC. Only ELF has a way. No DWARF DIE definition must use ELF IFUNC symbol names as GDB prefers DWARF symbols more than ELF symbols. These DWARF DW_AT_linkage_name symbols are marked in ELF as IFUNC: __GI___strcasecmp __GI_time __gettimeofday __memmove_chk __sched_cpucount __strcasestr memmove strstr time Out of those only these are of concern to users: memmove strstr time <0><18c0c5>: Abbrev Number: 1 (DW_TAG_compile_unit) <18c0cb> DW_AT_name : ../sysdeps/x86_64/multiarch/memmove.c <1><18c3f8>: Abbrev Number: 27 (DW_TAG_subprogram) <18c3f9> DW_AT_external : 1 <18c3f9> DW_AT_name : memmove_ifunc <18c3fd> DW_AT_decl_file : 2 <18c3fe> DW_AT_decl_line : 46 <18c3ff> DW_AT_linkage_name: memmove ^^^^^^^^^^^^^^^^^^^^^^^^^^^ <18c403> DW_AT_prototyped : 1 <18c403> DW_AT_type : <0x18c126> <18c407> DW_AT_low_pc : 0x88a70 <18c40f> DW_AT_high_pc : 0x88ab7 <18c417> DW_AT_frame_base : 1 byte block: 9c (DW_OP_call_frame_cfa) <18c419> DW_AT_GNU_all_call_sites: 1 <18c419> DW_AT_sibling : <0x18c43a> libc_ifunc (memmove, ^^^^^^^ Other uses of libc_ifunc are for example: libc_ifunc (__strcasestr, Attached broken fix attempt fails to build: ../sysdeps/x86_64/multiarch/memmove.c: In function '__memmove_ifunc': ../sysdeps/x86_64/multiarch/memmove.c:42:1: error: '__memmove' undeclared (first use in this function) -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
next reply other threads:[~2012-05-24 19:56 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-05-24 19:56 jan.kratochvil at redhat dot com [this message] 2012-08-08 13:55 ` [Bug libc/14166] " hjl.tools at gmail dot com 2012-08-08 15:53 ` hjl.tools at gmail dot com 2012-08-08 16:09 ` jan.kratochvil at redhat dot com 2012-08-08 17:52 ` hjl.tools at gmail dot com 2012-08-08 21:55 ` jan.kratochvil at redhat dot com 2012-08-10 6:01 ` jan.kratochvil at redhat dot com 2014-06-19 14:37 ` fweimer at redhat dot com
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