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http://sourceware.org/ml/gdb-patches/2013-05/msg00042.html
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Subject: [patch] Fix gcore for vDSO (on ppc64)
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Hi,
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on ppc64 GNU/Linux one gets in live process or kernel-generated core file:
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#0 0x00003fff9e946b3c in __pause_nocancel () from /lib64/libc.so.6
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#1 0x000000001000080c in handle_alrm (signo=14) at small.c:16
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#2 <signal handler called>
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#3 0x00003fff9e946b3c in __pause_nocancel () from /lib64/libc.so.6
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#4 0x0000000010000914 in main (argc=2, argv=0x3fffcd00dec8) at small.c:32
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while with gcore generated core file one gets:
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#0 0x00003fff9e946b3c in __pause_nocancel () from /lib64/libc.so.6
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#1 0x000000001000080c in handle_alrm (signo=14) at small.c:16
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#2 0x00003fff9ea70448 in ?? ()
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#3 0x0000000010000914 in main (argc=2, argv=0x3fffcd00dec8) at small.c:32
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This is because on ppc64 GNU/Linux the signal handler frame is in vDSO (and
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not in libc as on x86_64 GNU/Linux). And if one has kernel-debuginfo
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installed GDB gcore thinks it can omit the vDSO page from core file.
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As vDSO cannot be reliably found from link_map it should be rather fully
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present in the core file. Which also gcore_create_callback tries to do but it
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gets mistaken by the separate debug info.
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It seems pretty obvious patch to me.
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Thanks,
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Jan
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gdb/
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2013-05-03 Jan Kratochvil <jan.kratochvil@redhat.com>
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* gcore.c (gcore_create_callback): Ignore sections with
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separate_debug_objfile_backlink != NULL.
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--- gdb-7.6-orig/gdb/gcore.c 2013-01-01 07:32:42.000000000 +0100
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+++ gdb-7.6/gdb/gcore.c 2013-05-03 03:31:34.795312996 +0200
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@@ -428,8 +428,9 @@ gcore_create_callback (CORE_ADDR vaddr,
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This BFD was synthesized from reading target memory,
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we don't want to omit that. */
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- if (((vaddr >= start && vaddr + size <= end)
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- || (start >= vaddr && end <= vaddr + size))
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+ if (objfile->separate_debug_objfile_backlink == NULL
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+ && ((vaddr >= start && vaddr + size <= end)
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+ || (start >= vaddr && end <= vaddr + size))
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&& !(bfd_get_file_flags (abfd) & BFD_IN_MEMORY))
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{
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flags &= ~(SEC_LOAD | SEC_HAS_CONTENTS);
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