You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
57 lines
2.0 KiB
57 lines
2.0 KiB
6 years ago
|
http://sourceware.org/ml/gdb-patches/2013-05/msg00042.html
|
||
|
|
Subject: [patch] Fix gcore for vDSO (on ppc64)
|
||
|
|
|
||
|
|
Hi,
|
||
|
|
|
||
|
|
on ppc64 GNU/Linux one gets in live process or kernel-generated core file:
|
||
|
|
|
||
|
|
#0 0x00003fff9e946b3c in __pause_nocancel () from /lib64/libc.so.6
|
||
|
|
#1 0x000000001000080c in handle_alrm (signo=14) at small.c:16
|
||
|
|
#2 <signal handler called>
|
||
|
|
#3 0x00003fff9e946b3c in __pause_nocancel () from /lib64/libc.so.6
|
||
|
|
#4 0x0000000010000914 in main (argc=2, argv=0x3fffcd00dec8) at small.c:32
|
||
|
|
|
||
|
|
while with gcore generated core file one gets:
|
||
|
|
|
||
|
|
#0 0x00003fff9e946b3c in __pause_nocancel () from /lib64/libc.so.6
|
||
|
|
#1 0x000000001000080c in handle_alrm (signo=14) at small.c:16
|
||
|
|
#2 0x00003fff9ea70448 in ?? ()
|
||
|
|
#3 0x0000000010000914 in main (argc=2, argv=0x3fffcd00dec8) at small.c:32
|
||
|
|
|
||
|
|
This is because on ppc64 GNU/Linux the signal handler frame is in vDSO (and
|
||
|
|
not in libc as on x86_64 GNU/Linux). And if one has kernel-debuginfo
|
||
|
|
installed GDB gcore thinks it can omit the vDSO page from core file.
|
||
|
|
|
||
|
|
As vDSO cannot be reliably found from link_map it should be rather fully
|
||
|
|
present in the core file. Which also gcore_create_callback tries to do but it
|
||
|
|
gets mistaken by the separate debug info.
|
||
|
|
|
||
|
|
It seems pretty obvious patch to me.
|
||
|
|
|
||
|
|
|
||
|
|
Thanks,
|
||
|
|
Jan
|
||
|
|
|
||
|
|
|
||
|
|
gdb/
|
||
|
|
2013-05-03 Jan Kratochvil <jan.kratochvil@redhat.com>
|
||
|
|
|
||
|
|
* gcore.c (gcore_create_callback): Ignore sections with
|
||
|
|
separate_debug_objfile_backlink != NULL.
|
||
|
|
|
||
|
|
--- gdb-7.6-orig/gdb/gcore.c 2013-01-01 07:32:42.000000000 +0100
|
||
|
|
+++ gdb-7.6/gdb/gcore.c 2013-05-03 03:31:34.795312996 +0200
|
||
|
|
@@ -428,8 +428,9 @@ gcore_create_callback (CORE_ADDR vaddr,
|
||
|
|
|
||
|
|
This BFD was synthesized from reading target memory,
|
||
|
|
we don't want to omit that. */
|
||
|
|
- if (((vaddr >= start && vaddr + size <= end)
|
||
|
|
- || (start >= vaddr && end <= vaddr + size))
|
||
|
|
+ if (objfile->separate_debug_objfile_backlink == NULL
|
||
|
|
+ && ((vaddr >= start && vaddr + size <= end)
|
||
|
|
+ || (start >= vaddr && end <= vaddr + size))
|
||
|
|
&& !(bfd_get_file_flags (abfd) & BFD_IN_MEMORY))
|
||
|
|
{
|
||
|
|
flags &= ~(SEC_LOAD | SEC_HAS_CONTENTS);
|
||
|
|
|