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a8ba52bde5
ARM _dl_tlsdesc_dynamic slow path has two issues:
* The ip/r12 is defined by AAPCS as a scratch register, and gcc is
used to save the stack pointer before on some function calls. So it
should also be saved/restored as well. It fixes the tst-gnu2-tls2.
* None of the possible VFP registers are saved/restored. ARM has the
additional complexity to have different VFP bank sizes (depending of
VFP support by the chip).
The tst-gnu2-tls2 test is extended to check for VFP registers, although
only for hardfp builds. Different than setcontext, _dl_tlsdesc_dynamic
does not have HWCAP_ARM_IWMMXT (I don't have a way to properly test
it and it is almost a decade since newer hardware was released).
With this patch there is no need to mark tst-gnu2-tls2 as XFAIL.
Checked on arm-linux-gnueabihf.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
(cherry picked from commit 64c7e34428)
41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
/* Test TLSDESC relocation.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdint.h>
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struct tls
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{
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int64_t a, b, c, d;
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};
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extern struct tls *apply_tls (struct tls *);
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/* An architecture can define them to verify that clobber caller-saved
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registers aren't changed by the implicit TLSDESC call. */
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#ifndef INIT_TLSDESC_CALL
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# define INIT_TLSDESC_CALL()
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#endif
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#ifndef BEFORE_TLSDESC_CALL
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# define BEFORE_TLSDESC_CALL()
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#endif
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#ifndef AFTER_TLSDESC_CALL
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# define AFTER_TLSDESC_CALL()
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#endif
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