mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 13:30:06 +00:00
77 lines
2.7 KiB
C
77 lines
2.7 KiB
C
/* IFUNC resolver function for CPU specific functions.
|
|
64 bit S/390 version.
|
|
Copyright (C) 2012-2013 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <unistd.h>
|
|
#include <dl-procinfo.h>
|
|
|
|
#define STFLE_BITS_Z10 34 /* General instructions extension */
|
|
#define STFLE_BITS_Z196 45 /* Distinct operands, pop ... */
|
|
|
|
#ifndef NOT_IN_libc
|
|
|
|
#define IFUNC_RESOLVE(FUNC) \
|
|
asm (".globl " #FUNC "\n\t" \
|
|
".type " #FUNC ",@gnu_indirect_function\n\t" \
|
|
".set " #FUNC ",resolve_" #FUNC "\n\t" \
|
|
".globl __GI_" #FUNC "\n\t" \
|
|
".set __GI_" #FUNC "," #FUNC "\n"); \
|
|
\
|
|
/* Make the declarations of the optimized functions hidden in order
|
|
to prevent GOT slots being generated for them. */ \
|
|
extern __attribute__((visibility("hidden"))) void *FUNC##_z196; \
|
|
extern __attribute__((visibility("hidden"))) void *FUNC##_z10; \
|
|
extern __attribute__((visibility("hidden"))) void *FUNC##_z900; \
|
|
\
|
|
void *resolve_##FUNC (unsigned long int dl_hwcap) \
|
|
{ \
|
|
if (dl_hwcap & HWCAP_S390_STFLE) \
|
|
{ \
|
|
/* We want just 1 double word to be returned. */ \
|
|
register unsigned long reg0 asm("0") = 0; \
|
|
unsigned long stfle_bits; \
|
|
\
|
|
asm volatile(".machine push" "\n\t" \
|
|
".machine \"z9-109\"" "\n\t" \
|
|
"stfle %0" "\n\t" \
|
|
".machine pop" "\n" \
|
|
: "=QS" (stfle_bits), "+d" (reg0) \
|
|
: : "cc"); \
|
|
\
|
|
if ((stfle_bits & (1UL << (63 - STFLE_BITS_Z196))) != 0) \
|
|
return &FUNC##_z196; \
|
|
else if ((stfle_bits & (1UL << (63 - STFLE_BITS_Z10))) != 0) \
|
|
return &FUNC##_z10; \
|
|
else \
|
|
return &FUNC##_z900; \
|
|
} \
|
|
else \
|
|
return &FUNC##_z900; \
|
|
}
|
|
|
|
IFUNC_RESOLVE(memset)
|
|
IFUNC_RESOLVE(memcmp)
|
|
asm(".weak bcmp ; bcmp = memcmp");
|
|
|
|
/* In the static lib memcpy is needed before the reloc is resolved. */
|
|
#ifdef SHARED
|
|
IFUNC_RESOLVE(memcpy)
|
|
#endif
|
|
|
|
#endif
|