http://sourceware.org/bugzilla/show_bug.cgi?id=12914
Summary: dllwrap creates wrong DLLs with repeated fixups for
same address
Product: binutils
Version: 2.20
Status: NEW
Severity: normal
Priority: P2
Component: binutils
AssignedTo: unassig...@sources.redhat.com
ReportedBy: anp...@mail.ru
Sometimes dllwrap generates relocation tables which contain multiple entries
for same address. This leads to fixups being applied TWICE, and then, most
likely, to a fault. This problem is not noticeable if DLL loads to the "desired
base address", but instantly pops up if the desired address is occupied by
other library.
Testcase: create a sinle file named test.c:
--------------------------------
int x;
__declspec (dllexport) int test ()
{
x = 0;
return 1;
}
--------------------------------
Now create a DLL from it:
i686-pc-mingw32-gcc -c test.c
i686-pc-mingw32-dllwrap -o test.dll test.o
Now examine its relocation table:
i686-pc-mingw32-objdump --all test.dll |less
(for some reason objdump -r does not display relocations, but with --all it
does).
Now navigate to relocation table and see:
Virtual Address: 00001000 Chunk size 88 (0x58) Number of fixups 40
reloc 0 offset d [100d] HIGHLOW
reloc 1 offset 15 [1015] HIGHLOW
reloc 2 offset 3d [103d] HIGHLOW
reloc 3 offset 45 [1045] HIGHLOW
reloc 4 offset 69 [1069] HIGHLOW
reloc 5 offset 73 [1073] HIGHLOW
reloc 6 offset 88 [1088] HIGHLOW
[... skipped ...]
Virtual Address: 00001000 Chunk size 84 (0x54) Number of fixups 38
reloc 0 offset d [100d] HIGHLOW
reloc 1 offset 15 [1015] HIGHLOW
reloc 2 offset 3d [103d] HIGHLOW
reloc 3 offset 45 [1045] HIGHLOW
reloc 4 offset 69 [1069] HIGHLOW
reloc 5 offset 73 [1073] HIGHLOW
reloc 6 offset 88 [1088] HIGHLOW
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