Hi Mike,
I have found a workaround!
On Mon, 2006-07-31 at 00:23 -0400, Pavel Roskin wrote:
I agree. My gdb cannot show variables in 32-bit binaries (or maybe it's just something Wine specific), but it shows the line numbers. I traced find_symbol() in preloader.c, and it seems like symtabend is 0, so that the last loop is skipped and NULL is returned. This is also evidenced by the lack of "Found" in the log I sent in the previous message.
Adding more debug information confirms that:
dyn->d_tag=00000001 dyn->d_un.d_ptr=00000001 dyn->d_tag=00000001 dyn->d_un.d_ptr=00000094 dyn->d_tag=00000001 dyn->d_un.d_ptr=00000179 dyn->d_tag=0000000f dyn->d_un.d_ptr=000001c1 dyn->d_tag=0000000c dyn->d_un.d_ptr=7bf00b94 dyn->d_tag=0000000d dyn->d_un.d_ptr=7bf0123c dyn->d_tag=6ffffef5 dyn->d_un.d_ptr=7bf00434 dyn->d_tag=00000005 dyn->d_un.d_ptr=7bf00770 dyn->d_tag=00000006 dyn->d_un.d_ptr=7bf004e0 dyn->d_tag=0000000a dyn->d_un.d_ptr=0000027f dyn->d_tag=0000000b dyn->d_un.d_ptr=00000010 dyn->d_tag=00000015 dyn->d_un.d_ptr=00000000 dyn->d_tag=00000003 dyn->d_un.d_ptr=7bf023bc dyn->d_tag=00000002 dyn->d_un.d_ptr=000000b0 dyn->d_tag=00000014 dyn->d_un.d_ptr=00000011 dyn->d_tag=00000017 dyn->d_un.d_ptr=7bf00ae4 dyn->d_tag=00000011 dyn->d_un.d_ptr=7bf00ad4 dyn->d_tag=00000012 dyn->d_un.d_ptr=00000010 dyn->d_tag=00000013 dyn->d_un.d_ptr=00000008 dyn->d_tag=6ffffffe dyn->d_un.d_ptr=7bf00a44 dyn->d_tag=6fffffff dyn->d_un.d_ptr=00000003 dyn->d_tag=6ffffff0 dyn->d_un.d_ptr=7bf009f0 DT_HASH=00000004 symtab=7bf004e0 strings=7bf00770 symtabend=00000000 wine_main_preload_info not found
find_symbol() looks for DT_HASH (4) to set symtabend and fails to find it. As I understand it, we should trick ld into creating the DT_HASH tag or use some other way to locate wine_main_preload_info.
The 6ffffef5 tag is DT_GNU_HASH - that may be a good alternative to DT_HASH. Adding -Wl,--hash-style=sysv to the gcc flags when linking wine-pthread solves the problem!!!
I think adding support for DT_GNU_HASH would be a good idea anyway.