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77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
/* IFUNC resolver function for CPU specific functions.
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64 bit S/390 version.
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Copyright (C) 2012-2015 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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<http://www.gnu.org/licenses/>. */
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#include <unistd.h>
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#include <dl-procinfo.h>
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#define STFLE_BITS_Z10 34 /* General instructions extension */
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#define STFLE_BITS_Z196 45 /* Distinct operands, pop ... */
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#if IS_IN (libc)
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#define IFUNC_RESOLVE(FUNC) \
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asm (".globl " #FUNC "\n\t" \
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".type " #FUNC ",@gnu_indirect_function\n\t" \
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".set " #FUNC ",__resolve_" #FUNC "\n\t" \
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".globl __GI_" #FUNC "\n\t" \
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".set __GI_" #FUNC "," #FUNC "\n"); \
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\
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/* Make the declarations of the optimized functions hidden in order
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to prevent GOT slots being generated for them. */ \
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extern void *__##FUNC##_z196 attribute_hidden; \
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extern void *__##FUNC##_z10 attribute_hidden; \
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extern void *__##FUNC##_z900 attribute_hidden; \
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\
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void *__resolve_##FUNC (unsigned long int dl_hwcap) \
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{ \
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if (dl_hwcap & HWCAP_S390_STFLE) \
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{ \
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/* We want just 1 double word to be returned. */ \
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register unsigned long reg0 asm("0") = 0; \
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unsigned long stfle_bits; \
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\
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asm volatile(".machine push" "\n\t" \
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".machine \"z9-109\"" "\n\t" \
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"stfle %0" "\n\t" \
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".machine pop" "\n" \
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: "=QS" (stfle_bits), "+d" (reg0) \
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: : "cc"); \
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\
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if ((stfle_bits & (1UL << (63 - STFLE_BITS_Z196))) != 0) \
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return &__##FUNC##_z196; \
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else if ((stfle_bits & (1UL << (63 - STFLE_BITS_Z10))) != 0) \
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return &__##FUNC##_z10; \
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else \
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return &__##FUNC##_z900; \
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} \
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else \
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return &__##FUNC##_z900; \
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}
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IFUNC_RESOLVE(memset)
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IFUNC_RESOLVE(memcmp)
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asm(".weak bcmp ; bcmp = memcmp");
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/* In the static lib memcpy is needed before the reloc is resolved. */
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#ifdef SHARED
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IFUNC_RESOLVE(memcpy)
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#endif
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#endif
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