> Register $r10 contains the address of the next link map:
> (gdb) p (*preloads)->l_next
> $10 = (struct link_map *) 0x40000e88
>
> (gdb) p *(*preloads)->l_next
> $11 = {l_addr = 1076473856, l_name = 0x40000e78 "/lib/libdl.so.2",
> l_ld = 0x4029e5fc, l_next = 0x40001118, l_prev = 0x40000bf0,
> l_real = 0x40000e88, l_ns = 0, l_libname = 0x400010dc, l_info = {0x0,
> 0x4029e5fc, 0x0 <repeats 74 times>}, l_phdr = 0x4029b034,
> l_entry = 1076477148, l_phnum = 7, l_ldnum = 31, l_searchlist = {
> r_list = 0x0, r_nlist = 0}, l_symbolic_searchlist = {r_list = 0x400010d8,
> r_nlist = 0}, l_loader = 0x403d8880, l_versions = 0x0, l_nversions = 0,
> l_nbuckets = 0, l_gnu_bitmask_idxbits = 0, l_gnu_shift = 0,
> l_gnu_bitmask = 0x0, {l_gnu_buckets = 0x0, l_chain = 0x0}, {
> l_gnu_chain_zero = 0x0, l_buckets = 0x0}, l_direct_opencount = 0,
> l_type = lt_library, l_relocated = 0, l_init_called = 0, l_global = 0,
> l_reserved = 1, l_phdr_allocated = 0, l_soname_added = 0, l_faked = 0,
> l_need_tls_init = 0, l_used = 0, l_auditing = 0, l_audit_any_plt = 0,
> l_removed = 0, l_contiguous = 1, l_rpath_dirs = {dirs = 0x0, malloced = 0},
> l_reloc_result = 0x0, l_versyms = 0x0, l_origin = 0x400010f8 "/lib",
> l_map_start = 1076473856, l_map_end = 1076488476, l_text_end = 1076490240,
> l_scope_mem = {0x403d89dc, 0x0, 0x0, 0x0}, l_scope_max = 4,
> l_scope = 0x40001040, l_local_scope = {0x40000fe4, 0x0}, l_dev = 536937216,
> l_ino = 641559, l_runpath_dirs = {dirs = 0x0, malloced = 0},
> l_initfini = 0x0, l_reldepsmax = 0, l_reldeps = 0x0, l_feature_1 = 0,
> l_flags_1 = 0, l_flags = 0, l_idx = 0, l_mach = {fptr_table_len = 0,
> fptr_table = 0x0}, l_lookup_cache = {sym = 0x0, type_class = 0,
> value = 0x0, ret = 0x0}, l_tls_initimage = 0x0, l_tls_initimage_size = 0,
> l_tls_blocksize = 0, l_tls_align = 0, l_tls_firstbyte_offset = 0,
> l_tls_offset = 0, l_tls_modid = 0, l_relro_addr = 0, l_relro_size = 0,
> l_serial = 3, l_audit = 0x400010d8}
When I run the command directly under gdb, the info is a different location
and the string table entry is not null:
(gdb) bt
#0 _dl_map_object_deps (map=0x403d8880, preloads=0x40001170, npreloads=12,
trace_mode=0, open_mode=0) at dl-deps.c:224
#1 0x403b9bd4 in dl_main (phdr=0x10034, phnum=<value optimized out>,
user_entry=<value optimized out>) at rtld.c:1780
#2 0x403cb898 in _dl_sysdep_start (start_argptr=<value optimized out>,
dl_main=@0x403d7566: 0x403b8fe4 <dl_main>) at ../elf/dl-sysdep.c:239
#3 0x403b785c in _dl_start_final (arg=0xbff01028, info=0xbff01188)
at rtld.c:332
#4 0x403b7adc in _dl_start (arg=0xbff01028) at rtld.c:560
(gdb) p *(*preloads)->l_next
$2 = {l_addr = 1076473856, l_name = 0x40000c50 "/lib/libdl.so.2",
l_ld = 0x4029e5fc, l_next = 0x40000ef0, l_prev = 0x400009c8,
l_real = 0x40000c60, l_ns = 0, l_libname = 0x40000eb4, l_info = {0x0,
0x4029e604, 0x4029e66c, 0x4029e664, 0x4029e634, 0x4029e644, 0x4029e64c,
0x4029e684, 0x4029e68c, 0x4029e694, 0x4029e654, 0x4029e65c, 0x4029e614,
0x4029e61c, 0x4029e60c, 0x0, 0x0, 0x0, 0x0, 0x0, 0x4029e674, 0x0, 0x0,
0x4029e67c, 0x0, 0x4029e624, 0x0, 0x4029e62c, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x4029e6b4, 0x4029e6ac, 0x4029e6a4, 0x4029e69c, 0x0, 0x0, 0x4029e6c4,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x4029e6bc,
0x0 <repeats 25 times>, 0x4029e63c}, l_phdr = 0x4029b034,
l_entry = 1076477148, l_phnum = 7, l_ldnum = 31, l_searchlist = {
r_list = 0x0, r_nlist = 0}, l_symbolic_searchlist = {r_list = 0x40000eb0,
r_nlist = 0}, l_loader = 0x403d8880, l_versions = 0x0, l_nversions = 0,
l_nbuckets = 22, l_gnu_bitmask_idxbits = 3, l_gnu_shift = 7,
l_gnu_bitmask = 0x4029b144, {l_gnu_buckets = 0x4029b154,
l_chain = 0x4029b154}, {l_gnu_chain_zero = 0x4029b148,
l_buckets = 0x4029b148}, l_direct_opencount = 0, l_type = lt_library,
l_relocated = 0, l_init_called = 0, l_global = 0, l_reserved = 1,
l_phdr_allocated = 0, l_soname_added = 0, l_faked = 0, l_need_tls_init = 0,
l_used = 0, l_auditing = 0, l_audit_any_plt = 0, l_removed = 0,
l_contiguous = 1, l_rpath_dirs = {dirs = 0x0, malloced = 0},
l_reloc_result = 0x0, l_versyms = 0x0, l_origin = 0x40000ed0 "/lib",
l_map_start = 1076473856, l_map_end = 1076488476, l_text_end = 1076490240,
l_scope_mem = {0x403d89dc, 0x0, 0x0, 0x0}, l_scope_max = 4,
l_scope = 0x40000e18, l_local_scope = {0x40000dbc, 0x0}, l_dev = 536937216,
l_ino = 641559, l_runpath_dirs = {dirs = 0x0, malloced = 0},
l_initfini = 0x0, l_reldepsmax = 0, l_reldeps = 0x0, l_feature_1 = 0,
l_flags_1 = 0, l_flags = 0, l_idx = 0, l_mach = {fptr_table_len = 0,
fptr_table = 0x0}, l_lookup_cache = {sym = 0x0, type_class = 0,
value = 0x0, ret = 0x0}, l_tls_initimage = 0x0, l_tls_initimage_size = 0,
l_tls_blocksize = 0, l_tls_align = 0, l_tls_firstbyte_offset = 0,
l_tls_offset = 0, l_tls_modid = 0, l_relro_addr = 0, l_relro_size = 0,
l_serial = 3, l_audit = 0x40000eb0}
Dave
--
J. David Anglin dave.anglin@xxxxxxxxxxxxxx
National Research Council of Canada (613) 990-0752 (FAX: 952-6602)
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