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56 lines
2.0 KiB
56 lines
2.0 KiB
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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