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On s390, the memcpy, memcmp, memset functions are IFUNC symbols, which are created with s390_libc_ifunc-macro. This macro creates a __GI_ symbol which is set to the ifunced symbol. Thus calls within libc.so to e.g. memcpy result in a call to *ABS*+0x954c0@plt stub and afterwards to the resolved memcpy-ifunc-variant. This patch sets the __GI_ symbol to the default-ifunc-variant to avoid the plt call. The __GI_ symbols are now created at the default variant of ifunced function. ChangeLog: * sysdeps/s390/multiarch/ifunc-resolve.h (s390_libc_ifunc): Remove __GI_ symbol. * sysdeps/s390/s390-32/multiarch/memcmp-s390.S: Add __GI_memcmp symbol. * sysdeps/s390/s390-64/multiarch/memcmp-s390x.S: Likewise. * sysdeps/s390/s390-32/multiarch/memcpy-s390.S: Add __GI_memcpy symbol. * sysdeps/s390/s390-64/multiarch/memcpy-s390x.S: Likewise. * sysdeps/s390/s390-32/multiarch/memset-s390.S: Add __GI_memset symbol. * sysdeps/s390/s390-64/multiarch/memset-s390x.S: Likewise.
93 lines
3.5 KiB
C
93 lines
3.5 KiB
C
/* IFUNC resolver function for CPU specific functions.
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32/64 bit S/390 version.
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Copyright (C) 2015-2016 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 S390_STFLE_BITS_Z10 34 /* General instructions extension */
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#define S390_STFLE_BITS_Z196 45 /* Distinct operands, pop ... */
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#define S390_IS_Z196(STFLE_BITS) \
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((STFLE_BITS & (1ULL << (63 - S390_STFLE_BITS_Z196))) != 0)
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#define S390_IS_Z10(STFLE_BITS) \
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((STFLE_BITS & (1ULL << (63 - S390_STFLE_BITS_Z10))) != 0)
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#define S390_STORE_STFLE(STFLE_BITS) \
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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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\
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__asm__ __volatile__(".machine push" "\n\t" \
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".machine \"z9-109\"" "\n\t" \
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".machinemode \"zarch_nohighgprs\"\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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#define s390_libc_ifunc(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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\
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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##_default 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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&& (dl_hwcap & HWCAP_S390_ZARCH) \
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&& (dl_hwcap & HWCAP_S390_HIGH_GPRS)) \
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{ \
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unsigned long long stfle_bits; \
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S390_STORE_STFLE (stfle_bits); \
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\
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if (S390_IS_Z196 (stfle_bits)) \
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return &__##FUNC##_z196; \
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else if (S390_IS_Z10 (stfle_bits)) \
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return &__##FUNC##_z10; \
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else \
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return &__##FUNC##_default; \
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} \
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else \
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return &__##FUNC##_default; \
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}
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#define s390_vx_libc_ifunc(FUNC) \
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s390_vx_libc_ifunc2(FUNC, FUNC)
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#define s390_vx_libc_ifunc2(RESOLVERFUNC, FUNC) \
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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 __typeof (FUNC) RESOLVERFUNC##_vx attribute_hidden; \
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extern __typeof (FUNC) RESOLVERFUNC##_c attribute_hidden; \
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extern void *__resolve_##RESOLVERFUNC (unsigned long int) __asm__ (#FUNC); \
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\
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void *__resolve_##RESOLVERFUNC (unsigned long int dl_hwcap) \
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{ \
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if (dl_hwcap & HWCAP_S390_VX) \
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return &RESOLVERFUNC##_vx; \
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else \
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return &RESOLVERFUNC##_c; \
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} \
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__asm__ (".type " #FUNC ", %gnu_indirect_function");
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