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This removes _DYNAMIC@gotpc from elf_machine_load_address()
This is a seperate commit to callout the fact that old code was actually
broken but was NOT caught since it never gets called (and will never be)
since ld.so only calls it if kernel doesn't pass AT_BASE auxvt, which is
not true for Linux.
if (!auxvt[AT_BASE].a_un.a_val)
auxvt[AT_BASE].a_un.a_val = elf_machine_load_address();
So while the intent was to remove _DYNAMIC@gotpc construct, we need to
come up with something which works.
The build time address computation of .dynamic which works well is:
- "ld %1, [pcl, _DYNAMIC@gotpc] \n"
+ "ld %1, [pcl, _GLOBAL_OFFSET_TABLE_@pcl] \n"
However the runtime address of .dynamic can only be generated with
"add %0, pcl, _DYNAMIC@pcl \n"
which unfortunately is what is currently broken as it is converted to
i_GLOBAL_OFFSET_TABLE_t and thus refers to runtime address of .got and
not .dyanmic
Thus we resort to using an arbit symbol _dl_start at the expense of an
extra GOT entry and a bogus R_ARC_NONE relo in ldso itself which now
needs to be ignored.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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This commit reverses a change introduced in commit 20554a78a9bba that
split some of the ARC code into two based on whether uClibc was
configured with native threads or not.
The native thread code was updated to use the relocation syntax of
modern binutils, while the non-native code path used a syntax only
accepted in older versions of binutils.
The problem with this is that the choice of old binutils or not is
orthogonal to the choice of native threads or not, and so, inevitably a
user with a recent version of binutils can make the choice to configure
uClibc with non-native thread support, and run into code that will not
assemble.
The solution is either to abandon support for the old tools completely,
or to add a new compile time flag for ARC that is set when the version
of binutils being used is old; this new flag would allow the old
relocation structure to be selected.
In this commit I have simply dropped support for older versions of the
tools.
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This commit adds support for R_ARC_JMP_SLOT relocations during the
bootstrap phase of the dynamic linker. These relocations will be
generated if uClibc-ng is configured with 'DODEBUG=y'.
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uClibc mainline supports NPTL which in turns depends on TLS support in
the tools (gcc/binutils), which is yet to be merged in dev branches.
However there is some non NPTL code in uClibc, added as part of NPTL
effort, which relies on certain relocations only provided by NPTL
binutils. As a result building the current upstream even for LT.old
breaks.
So conditionalize that code on tools, bu tin lack of specific versions,
we use NPTL enabling as a sign the tools are equipped to handle those
relos.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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Signed-off-by: Joern Rennecke <joern.rennecke@embecosm.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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