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x64-windows: Fix extraction of chained UNWIND_INFO

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On x86_64-windows, GDB is unable to unwind past some code in
mswsock.dll. For instance:

    (gdb) bt
    #0  0x00000000778712fa in ntdll!ZwWaitForSingleObject ()
       from C:\Windows\SYSTEM32\ntdll.dll
    #1  0x000007fefcfb0f75 in WSPStartup ()
       from C:\Windows\system32\mswsock.dll
    Backtrace stopped: previous frame inner to this frame (corrupt stack?)

The UNWIND_INFO record for frame #1's PC has a UNW_FLAG_CHAININFO
flag, and so after having decoded this unwind record, GDB's decoder
next tries to locate the next unwind record on the chain. Unfortunately,
the location of that unwind info appears to be miscomputed. This is
the expression used:

         chain_vma = cache->image_base + unwind_info
           + sizeof (ex_ui) + ((codes_count + 1) & ~1) * 2 + 8;

The chain-info is expected to be right after the "Unwind codes
array" which is itself after all the fields of ex_ui's struct.
So the "+ 8" offset at the end should not be there.

Because of that extra offset, we were reading no longer processing
correct unwind info, leading the unwinder computing the wrong frame
size, computing the wrong return address, etc.

gdb/ChangeLog:

        * amd64-windows-tdep.c (amd64_windows_frame_decode_insns):
        Remove "+ 8" offset in computation of CHAIN_VMA.
This commit is contained in:
Joel Brobecker 2014-06-11 14:07:27 +02:00
parent 8c78401680
commit e068c55d5e
2 changed files with 6 additions and 1 deletions
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5
gdb/ChangeLog
View file

@ -1,3 +1,8 @@
2014-08-01 Joel Brobecker <brobecker@adacore.com>
* amd64-windows-tdep.c (amd64_windows_frame_decode_insns):
Remove "+ 8" offset in computation of CHAIN_VMA.
2014-07-31 Doug Evans <dje@google.com>
* inflow.c (child_terminal_inferior): Add comment.

2
gdb/amd64-windows-tdep.c
View file

@ -826,7 +826,7 @@ amd64_windows_frame_decode_insns (struct frame_info *this_frame,
CORE_ADDR chain_vma;
chain_vma = cache->image_base + unwind_info
+ sizeof (ex_ui) + ((codes_count + 1) & ~1) * 2 + 8;
+ sizeof (ex_ui) + ((codes_count + 1) & ~1) * 2;
if (target_read_memory (chain_vma, (gdb_byte *) &d, sizeof (d)) != 0)
return;