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doing double negatives
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The following patches add support for the Xtensa processor architecture
to uClibc. They are based on a recent SVN checkout (12/05/2007).
The first patch (attached to this post) adds Xtensa support to various
shared configuration and make files. The following patches then include
the Xtensa specific files and directories.
I welcome any feedback and would appreciate it if you could include the
patches into the mainline tree. I am certainly committed to maintain the port.
Bob Wilson was kind enough to review the patches.
Some notes about the architecture: Xtensa is a configurable and
extensible processor architecture developed by Tensilica. For more
information, please visit: www.linux-xtensa.org.
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These are mostly the changes necessary to deal with loading the libraries
into memory. A couple new target macros are defined for this purpose, and
the code in dl-elf.c is modified to deal with nommu systems.
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A couple more target macros for ld.so to deal with FD-PIC support. We need
special code to compute the initial got and dpnt, and we need to pass extra
arguments to _dl_get_ready_to_run.
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Add a hash table for function descriptors on FD-PIC targets.
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Change _dl_find_hash to _dl_lookup_hash, as on the NPTL branch.
_dl_find_hash is now a wrapper function around it; unlike on the NPTL branch,
it retains the old interface so that not all callers need to be changed.
_dl_lookup_hash can optionally give its caller a pointer to the module where
the symbol was found.
Introduce ELF_RTYPE_CLASS_DLSYM for lookups from libdl.
Spelling fixes in the Blackfin port, since Alex Oliva's original version of
these patches used _dl_find_hash_mod as the name of the function rather than
_dl_lookup_hash.
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Add the necessary changes in ld.so and libdl to deal with targets that
prepend an underscore to symbol names.
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Add a new function _dl_free. In _dl_malloc, ensure we always get back a full
page from mmap.
Reset _dl_malloc_function and _dl_free_function when libdl is initialized.
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system calls actually being inlined, so AVR32 needs to use
__always_inline instead of just inline. The attached patch changes this
for the system calls.
Signed-off-by: Hans-Christian Egtvedt <hcegtvedt@atmel.com>
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<hcegtvedt@atmel.com>
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Mazinger
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I got the library to compile with the attached patches, though dynamic
loader crashes early.
In buildroot I changed the architecture name by hand from sparc to
sparc64, otherwise the compiler produced 32-bit files with V9 (64-bit)
instructions. This configuration is not supported by QEMU, so I aimed
for pure 64-bit. I think Sparc64 option needs to be added to
buildroot.
The _Qp_ ops seem to be required by the ABI. This and setjmp patches
are just hacks to get the compilation further. The _Qp_ ops can be
found in glibc, would it be OK to use those?
V9 assembler requires declarations for global register use.
The mem* functions in sparc32 directory did not work. They are
actually used only by the hybrid 32-bit + V9 CPU configuration.
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From Atsushi Nemoto.
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be 0 in this case. Avoids some warnings).
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minor include file issues
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This reintroduces a mechanism identical to the DL_BOOT macro present in
older versions of uClibc. On Blackfin and FRV, we want to pass more
than one argument to _dl_start. We also want to do something special
before returning, so delete the warning when the START macro is defined.
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This introduces a new SEND_EARLY_STDERR macro that is to be used in
dl-startup.c before ld.so is relocated. It is needed on Blackfin (and
frv) FDPIC since we have to use special tricks to get the address of a
string constant.
EARLY_STDERR_SPECIAL gets defined on such a machine and prevents
printing of debug strings inside the loop that relocates ld.so, since we
can't decide which of the two variants to use.
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create some default macros for do_rem/do_div_10 so we dont duplicate the samething in many arch header files
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need the defines from the former.
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header files.
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usage
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Nicolas Bellido
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in various places defined(__arm__) is used to protect/select code which
is ARM specific, that code must also be selected for __thumb__ because
__thumb__ is an ARM but __arm__ is not set...
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specific header file to make porting/updates a lot easier
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