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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)
129 lines
4.2 KiB
C
129 lines
4.2 KiB
C
/* Test TLSDESC relocation. ARM version.
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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 <config.h>
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#include <sys/auxv.h>
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#include <string.h>
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#include <stdlib.h>
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#include <endian.h>
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#ifndef __SOFTFP__
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# ifdef HAVE_ARM_PCS_VFP_D32
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# define SAVE_VFP_D32 \
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asm volatile ("vldr d16,=17" : : : "d16"); \
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asm volatile ("vldr d17,=18" : : : "d17"); \
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asm volatile ("vldr d18,=19" : : : "d18"); \
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asm volatile ("vldr d19,=20" : : : "d19"); \
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asm volatile ("vldr d20,=21" : : : "d20"); \
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asm volatile ("vldr d21,=22" : : : "d21"); \
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asm volatile ("vldr d22,=23" : : : "d22"); \
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asm volatile ("vldr d23,=24" : : : "d23"); \
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asm volatile ("vldr d24,=25" : : : "d24"); \
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asm volatile ("vldr d25,=26" : : : "d25"); \
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asm volatile ("vldr d26,=27" : : : "d26"); \
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asm volatile ("vldr d27,=28" : : : "d27"); \
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asm volatile ("vldr d28,=29" : : : "d28"); \
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asm volatile ("vldr d29,=30" : : : "d29"); \
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asm volatile ("vldr d30,=31" : : : "d30"); \
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asm volatile ("vldr d31,=32" : : : "d31");
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# else
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# define SAVE_VFP_D32
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# endif
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# define INIT_TLSDESC_CALL() \
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unsigned long hwcap = getauxval (AT_HWCAP)
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/* Set each vector register to a value from 1 to 32 before the TLS access,
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dump to memory after TLS access, and compare with the expected values. */
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# define BEFORE_TLSDESC_CALL() \
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if (hwcap & HWCAP_ARM_VFP) \
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{ \
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asm volatile ("vldr d0,=1" : : : "d0"); \
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asm volatile ("vldr d1,=2" : : : "d1"); \
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asm volatile ("vldr d2,=3" : : : "d1"); \
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asm volatile ("vldr d3,=4" : : : "d3"); \
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asm volatile ("vldr d4,=5" : : : "d4"); \
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asm volatile ("vldr d5,=6" : : : "d5"); \
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asm volatile ("vldr d6,=7" : : : "d6"); \
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asm volatile ("vldr d7,=8" : : : "d7"); \
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asm volatile ("vldr d8,=9" : : : "d8"); \
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asm volatile ("vldr d9,=10" : : : "d9"); \
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asm volatile ("vldr d10,=11" : : : "d10"); \
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asm volatile ("vldr d11,=12" : : : "d11"); \
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asm volatile ("vldr d12,=13" : : : "d12"); \
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asm volatile ("vldr d13,=14" : : : "d13"); \
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asm volatile ("vldr d14,=15" : : : "d14"); \
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asm volatile ("vldr d15,=16" : : : "d15"); \
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} \
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if (hwcap & HWCAP_ARM_VFPD32) \
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{ \
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SAVE_VFP_D32 \
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}
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# define VFP_STACK_REQ (16*8)
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# if __BYTE_ORDER == __BIG_ENDIAN
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# define DISP 7
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# else
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# define DISP 0
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# endif
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# ifdef HAVE_ARM_PCS_VFP_D32
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# define CHECK_VFP_D32 \
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char vfp[VFP_STACK_REQ]; \
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asm volatile ("vstmia %0, {d16-d31}\n" \
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: \
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: "r" (vfp) \
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: "memory"); \
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\
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char expected[VFP_STACK_REQ] = { 0 }; \
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for (int i = 0; i < 16; ++i) \
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expected[i * 8 + DISP] = i + 17; \
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\
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if (memcmp (vfp, expected, VFP_STACK_REQ) != 0) \
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abort ();
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# else
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# define CHECK_VFP_D32
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# endif
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# define AFTER_TLSDESC_CALL() \
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if (hwcap & HWCAP_ARM_VFP) \
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{ \
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char vfp[VFP_STACK_REQ]; \
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asm volatile ("vstmia %0, {d0-d15}\n" \
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: \
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: "r" (vfp) \
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: "memory"); \
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\
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char expected[VFP_STACK_REQ] = { 0 }; \
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for (int i = 0; i < 16; ++i) \
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expected[i * 8 + DISP] = i + 1; \
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\
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if (memcmp (vfp, expected, VFP_STACK_REQ) != 0) \
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abort (); \
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} \
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if (hwcap & HWCAP_ARM_VFPD32) \
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{ \
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CHECK_VFP_D32 \
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}
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#endif /* __SOFTFP__ */
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#include_next <tst-gnu2-tls2.h>
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