------- Additional Comments From amodra at bigpond dot net dot au 2005-04-15
11:19 -------
libqt-mt.so.3.3.4 defines [EMAIL PROTECTED]
$22 = {root = {root = {next = 0x85d2380,
string = 0x85a9ea0 "[EMAIL PROTECTED]", hash = 421875337},
type = bfd_link_hash_undefweak, u = {undef = {next = 0x0,
abfd = 0x85890e8, weak = 0x85890e8}, def = {next = 0x0,
section = 0x85890e8, value = 140021992}, i = {next = 0x0,
link = 0x85890e8, warning = 0x85890e8 "\002"}, c = {next = 0x0,
p = 0x85890e8, size = 140021992}}}, indx = -1, dynindx = -1, got = {
refcount = 0, offset = 0, glist = 0x0, plist = 0x0}, plt = {refcount = 0,
offset = 0, glist = 0x0, plist = 0x0}, size = 0, type = 0, other = 0,
ref_regular = 0, def_regular = 0, ref_dynamic = 0, def_dynamic = 0,
ref_regular_nonweak = 0, dynamic_adjusted = 0, needs_copy = 0,
needs_plt = 0, non_elf = 0, hidden = 0, forced_local = 0, mark = 0,
non_got_ref = 0, dynamic_def = 0, dynamic_weak = 0,
pointer_equality_needed = 0, dynstr_index = 0, u = {weakdef = 0x0,
elf_hash_value = 0}, verinfo = {verdef = 0x0, vertree = 0x0},
vtable = 0x0}
libqt-mt.so.3.3.4 is needed, so above is kept.
libpthread.so.0 defines pthread_mutex_init@@GLIBC_2.0
$25 = {root = {root = {next = 0x865fa24,
string = 0x876b230 "pthread_mutex_init@@GLIBC_2.0", hash = 329801547},
type = bfd_link_hash_defined, u = {undef = {next = 0x0, abfd = 0x85be3a4,
weak = 0x2700}, def = {next = 0x0, section = 0x85be3a4,
value = 9984}, i = {next = 0x0, link = 0x85be3a4,
warning = 0x2700 <Address 0x2700 out of bounds>}, c = {next = 0x0,
p = 0x85be3a4, size = 9984}}}, indx = -1, dynindx = -1, got = {
refcount = 0, offset = 0, glist = 0x0, plist = 0x0}, plt = {refcount = 0,
offset = 0, glist = 0x0, plist = 0x0}, size = 0, type = 0, other = 0,
ref_regular = 0, def_regular = 0, ref_dynamic = 0, def_dynamic = 0,
ref_regular_nonweak = 0, dynamic_adjusted = 0, needs_copy = 0,
needs_plt = 0, non_elf = 0, hidden = 0, forced_local = 0, mark = 0,
non_got_ref = 0, dynamic_def = 0, dynamic_weak = 0,
pointer_equality_needed = 0, dynstr_index = 0, u = {weakdef = 0x0,
elf_hash_value = 0}, verinfo = {verdef = 0x85bcbf0, vertree = 0x85bcbf0},
vtable = 0x0}
the linker creates an indirect symbol, pthread_mutex_init
(gdb) p *hi
$30 = {root = {root = {next = 0x8739a04,
string = 0x87720bc "pthread_mutex_init", hash = 268710567},
type = bfd_link_hash_indirect, u = {undef = {next = 0x0,
abfd = 0x8772060, weak = 0x0}, def = {next = 0x0,
section = 0x8772060, value = 0}, i = {next = 0x0, link = 0x8772060,
warning = 0x0}, c = {next = 0x0, p = 0x8772060, size = 0}}},
indx = -1, dynindx = -1, got = {refcount = 0, offset = 0, glist = 0x0,
plist = 0x0}, plt = {refcount = 0, offset = 0, glist = 0x0, plist = 0x0},
size = 0, type = 0, other = 0, ref_regular = 0, def_regular = 0,
ref_dynamic = 0, def_dynamic = 0, ref_regular_nonweak = 0,
dynamic_adjusted = 0, needs_copy = 0, needs_plt = 0, non_elf = 0,
hidden = 0, forced_local = 0, mark = 0, non_got_ref = 0, dynamic_def = 0,
dynamic_weak = 0, pointer_equality_needed = 0, dynstr_index = 0, u = {
weakdef = 0x0, elf_hash_value = 0}, verinfo = {verdef = 0x0,
vertree = 0x0}, vtable = 0x0}
(gdb) p *hi->root.u.i.link
$31 = {root = {next = 0x865fa24,
string = 0x876b230 "pthread_mutex_init@@GLIBC_2.0", hash = 329801547},
type = bfd_link_hash_defined, u = {undef = {next = 0x0, abfd = 0x85be3a4,
weak = 0x2700}, def = {next = 0x0, section = 0x85be3a4, value = 9984},
i = {next = 0x0, link = 0x85be3a4,
warning = 0x2700 <Address 0x2700 out of bounds>}, c = {next = 0x0,
p = 0x85be3a4, size = 9984}}}
and also an indirection from the nondefault version,
[EMAIL PROTECTED] which was undefweak from libqt-mt.so.3.3.4
(gdb) p *h
$33 = {root = {next = 0x85d2380,
string = 0x85a9ea0 "[EMAIL PROTECTED]", hash = 421875337},
type = bfd_link_hash_indirect, u = {undef = {next = 0x0, abfd = 0x8772060,
weak = 0x85890e8}, def = {next = 0x0, section = 0x8772060,
value = 140021992}, i = {next = 0x0, link = 0x8772060,
warning = 0x85890e8 "\002"}, c = {next = 0x0, p = 0x8772060,
size = 140021992}}}
(gdb) p *h->u.i.link
$34 = {root = {next = 0x865fa24,
string = 0x876b230 "pthread_mutex_init@@GLIBC_2.0", hash = 329801547},
type = bfd_link_hash_defined, u = {undef = {next = 0x0, abfd = 0x85be3a4,
weak = 0x2700}, def = {next = 0x0, section = 0x85be3a4, value = 9984},
i = {next = 0x0, link = 0x85be3a4,
warning = 0x2700 <Address 0x2700 out of bounds>}, c = {next = 0x0,
p = 0x85be3a4, size = 9984}}}
and this code:
/* If the indirect symbol has been referenced, we need to
push the reference down to the symbol we are
referencing. */
if (h->type != bfd_link_hash_new)
{
row = UNDEF_ROW;
cycle = TRUE;
}
then results in u.undef.next pointing back at the syms
$36 = {root = {next = 0x85d2380,
string = 0x85a9ea0 "[EMAIL PROTECTED]", hash = 421875337},
type = bfd_link_hash_indirect, u = {undef = {next = 0x865f858,
abfd = 0x8772060, weak = 0x85890e8}, def = {next = 0x865f858,
section = 0x8772060, value = 140021992}, i = {next = 0x865f858,
link = 0x8772060, warning = 0x85890e8 "\002"}, c = {next = 0x865f858,
p = 0x8772060, size = 140021992}}}
$37 = {root = {next = 0x865fa24,
string = 0x876b230 "pthread_mutex_init@@GLIBC_2.0", hash = 329801547},
type = bfd_link_hash_defined, u = {undef = {next = 0x8772060,
abfd = 0x85be3a4, weak = 0x2700}, def = {next = 0x8772060,
section = 0x85be3a4, value = 9984}, i = {next = 0x8772060,
link = 0x85be3a4, warning = 0x2700 <Address 0x2700 out of bounds>},
c = {next = 0x8772060, p = 0x85be3a4, size = 9984}}}
but libpthread.so.0 isn't needed, so the syms get set back to newly
created. (shown below are what we have after my fix to elf_smash_syms
ie. root.u.undef.next cleared.)
1: *h = {root = {root = {next = 0x865fa24,
string = 0x876b230 "pthread_mutex_init@@GLIBC_2.0", hash = 329801547},
type = bfd_link_hash_new, u = {undef = {next = 0x0, abfd = 0x8589310,
weak = 0x0}, def = {next = 0x0, section = 0x8589310, value = 0}, i = {
next = 0x0, link = 0x8589310, warning = 0x0}, c = {next = 0x0,
p = 0x8589310, size = 0}}}, indx = -1, dynindx = -1, got = {
refcount = 0, offset = 0, glist = 0x0, plist = 0x0}, plt = {refcount = 0,
offset = 0, glist = 0x0, plist = 0x0}, size = 0, type = 0, other = 0,
ref_regular = 0, def_regular = 0, ref_dynamic = 0, def_dynamic = 0,
ref_regular_nonweak = 0, dynamic_adjusted = 0, needs_copy = 0,
needs_plt = 0, non_elf = 0, hidden = 0, forced_local = 0, mark = 0,
non_got_ref = 0, dynamic_def = 0, dynamic_weak = 0,
pointer_equality_needed = 0, dynstr_index = 0, u = {weakdef = 0x0,
elf_hash_value = 0}, verinfo = {verdef = 0x0, vertree = 0x0},
vtable = 0x0}
1: *h = {root = {root = {next = 0x85d2380,
string = 0x85a9ea0 "[EMAIL PROTECTED]", hash = 421875337},
type = bfd_link_hash_new, u = {undef = {next = 0x0, abfd = 0x8589310,
weak = 0x0}, def = {next = 0x0, section = 0x8589310, value = 0}, i = {
next = 0x0, link = 0x8589310, warning = 0x0}, c = {next = 0x0,
p = 0x8589310, size = 0}}}, indx = -1, dynindx = -1, got = {
refcount = 0, offset = 0, glist = 0x0, plist = 0x0}, plt = {refcount = 0,
offset = 0, glist = 0x0, plist = 0x0}, size = 0, type = 0, other = 0,
ref_regular = 0, def_regular = 0, ref_dynamic = 0, def_dynamic = 0,
ref_regular_nonweak = 0, dynamic_adjusted = 0, needs_copy = 0,
needs_plt = 0, non_elf = 0, hidden = 0, forced_local = 0, mark = 0,
non_got_ref = 0, dynamic_def = 0, dynamic_weak = 0,
pointer_equality_needed = 0, dynstr_index = 0, u = {weakdef = 0x0,
elf_hash_value = 0}, verinfo = {verdef = 0x0, vertree = 0x0},
vtable = 0x0}
then libX11.so.6.2 makes a reference to [EMAIL PROTECTED]
which results in
$40 = {root = {root = {next = 0x85d2380,
string = 0x85a9ea0 "[EMAIL PROTECTED]", hash = 421875337},
type = bfd_link_hash_undefined, u = {undef = {next = 0x0,
abfd = 0x8589548, weak = 0x0}, def = {next = 0x0,
section = 0x8589548, value = 0}, i = {next = 0x0, link = 0x8589548,
warning = 0x0}, c = {next = 0x0, p = 0x8589548, size = 0}}},
indx = -1, dynindx = -1, got = {refcount = 0, offset = 0, glist = 0x0,
plist = 0x0}, plt = {refcount = 0, offset = 0, glist = 0x0, plist = 0x0},
size = 0, type = 0, other = 0, ref_regular = 0, def_regular = 0,
ref_dynamic = 0, def_dynamic = 0, ref_regular_nonweak = 0,
dynamic_adjusted = 0, needs_copy = 0, needs_plt = 0, non_elf = 0,
hidden = 0, forced_local = 0, mark = 0, non_got_ref = 0, dynamic_def = 0,
dynamic_weak = 0, pointer_equality_needed = 0, dynstr_index = 0, u = {
weakdef = 0x0, elf_hash_value = 0}, verinfo = {verdef = 0x0,
vertree = 0x0}, vtable = 0x0}
and putting the above sym on the undefs list. So that explains how
undef.next can be set when adding symbols from an as-needed lib.
--
http://sources.redhat.com/bugzilla/show_bug.cgi?id=815
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