Ensure that all objects in ARM EABI glibc have the proper EABI build
attributes to indicate that 8-byte stack alignment is required and
preserved. (GNU ld does not currently give errors for mixing code
requiring 8-byte alignment - such as anything built with GCC - and
code not marked as preserving it, because of the prevalence of
assembly code without proper markers to indicate that alignment is
preserved. The ARM RealView linker does give such errors.)
The bulk of the markers are accomplished by the change to sysdep.h,
but a few .S files do not include sysdep.h. In the case of
internal_accept4.S, no code is generated because EABI does not have
socketcall, but for completeness a dummy file with the right
attributes is used to override the default version in libc.
* sysdeps/arm/sysdep.h: (Tag_ABI_align8_preserved,
Tag_ABI_align8_needed): Attributes added.
* sysdeps/arm/elf/start.S: Likewise.
* sysdeps/arm/eabi/abi-note.S: New file.
* sysdeps/unix/sysv/linux/arm/eabi/internal_accept4.S: New
file.
* setjmp and longjmp were using the obsolete fstmiax and fldmiax
instructions.
* Because of a confusion with two different sets of names for the same
registers (r0...r3 and a1...a4), if VFP was present then the
subsequent check for iWMMXt support would use a register that had
been clobbered by saving/restoring the VFP registers. (The bit
being checked was clobbered by a reserved bit of FPSCR that it
always 0 on present hardware, and no present hardware has both VFP
and iWMMXt, so this did not cause visible problems.)
2009-10-22 Andrew Stubbs <ams@codesourcery.com>
Julian Brown <julian@codesourcery.com>
* sysdeps/arm/eabi/setjmp.S (__sigsetjmp): Replace deprecated
instruction fstmiax with vstmia.
Correct register conflict and comment.
* sysdeps/arm/eabi/__longjmp.S (__longjmp): Use vldmia not fldmiax.
Don't clobber r1/a2 register before testing IWMMXT hwcap.
* sysdeps/arm/eabi/aeabi_lcsts.c (__aeabi_stdin, __aeabi_stdout,
__aeabi_stderr): New variables.
(setup_aeabi_stdio): New function. Add it to .preinit_array.
Joseph Myers <joseph@codesourcery.com>
* sysdeps/arm/dl-machine.h (elf_machine_dynamic): Ditto.
(elf_machine_load_address): Clear T bit of PLT entry contents.
(RTLD_START): Mark function symbols as such. Tweak pc-relative
addressing to avoid depending on pc read pipeline offset.
* sysdeps/arm/machine-gmon.h (MCOUNT): Add Thumb-2 implementation.
* sysdeps/arm/tls-macros.h: Add alignment for Thumb-2.
(ARM_PC_OFFSET): Define.
(TLS_IE): Define differently for Thumb-2.
(TLS_LE, TLS_LD, TLS_GD): Use ARM_PC_OFFSET.
* sysdeps/arm/elf/start.S: Switch to thumb mode for Thumb-2.
* sysdeps/unix/sysv/linux/arm/eabi/sysdep.h (INTERNAL_SYSCALL_RAW):
Add Thumb implementation.
* sysdeps/unix/sysv/linux/arm/eabi/nptl/aio_misc.h: New.
* sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind-resume.c: Enforce
alignment for Thumb-2. Adjust offset from PC for Thumb-2.
* sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind-forcedunwind.c: Ditto.
* sysdeps/unix/sysv/linux/arm/nptl/bits/atomic.h (atomic_full_barrier,
__arch_compare_and_exchange_val_32_acq): Add Thumb-2 implementation.
Joseph Myers
Paul Eggert
Aurelien Jarno
Nathan Sidwell
David Alan Gilbert
Andreas Schwab
Richard Sandiford
Konstantinos Margaritis
Ulrich Weigand
Manjunath Matti
Thomas Schwinge
Philip Blundell
Daniel Gutson
Andrew Stubbs
Julian Brown
Paul Brook
Nathan Froyd
Maxim Kuvyrkov
Daniel Jacobowitz