mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
fd484e057d
This patch introduces a s390 specific ifunc resolver macro for 32/64bit, which chooses <func>_vx with vector instructions if HWCAP_S390_VX flag in hwcaps is set or <func>_c if not. ChangeLog: * sysdeps/s390/multiarch/ifunc-resolve.h (s390_vx_libc_ifunc, s390_vx_libc_ifunc2): New macro function.
95 lines
3.5 KiB
C
95 lines
3.5 KiB
C
/* IFUNC resolver function for CPU specific functions.
|
|
32/64 bit S/390 version.
|
|
Copyright (C) 2015 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 S390_STFLE_BITS_Z10 34 /* General instructions extension */
|
|
#define S390_STFLE_BITS_Z196 45 /* Distinct operands, pop ... */
|
|
|
|
#define S390_IS_Z196(STFLE_BITS) \
|
|
((STFLE_BITS & (1ULL << (63 - S390_STFLE_BITS_Z196))) != 0)
|
|
|
|
#define S390_IS_Z10(STFLE_BITS) \
|
|
((STFLE_BITS & (1ULL << (63 - S390_STFLE_BITS_Z10))) != 0)
|
|
|
|
#define S390_STORE_STFLE(STFLE_BITS) \
|
|
/* We want just 1 double word to be returned. */ \
|
|
register unsigned long reg0 asm("0") = 0; \
|
|
\
|
|
asm volatile(".machine push" "\n\t" \
|
|
".machine \"z9-109\"" "\n\t" \
|
|
".machinemode \"zarch_nohighgprs\"\n\t" \
|
|
"stfle %0" "\n\t" \
|
|
".machine pop" "\n" \
|
|
: "=QS" (STFLE_BITS), "+d" (reg0) \
|
|
: : "cc");
|
|
|
|
#define s390_libc_ifunc(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 void *__##FUNC##_z196 attribute_hidden; \
|
|
extern void *__##FUNC##_z10 attribute_hidden; \
|
|
extern void *__##FUNC##_default attribute_hidden; \
|
|
\
|
|
void *__resolve_##FUNC (unsigned long int dl_hwcap) \
|
|
{ \
|
|
if ((dl_hwcap & HWCAP_S390_STFLE) \
|
|
&& (dl_hwcap & HWCAP_S390_ZARCH) \
|
|
&& (dl_hwcap & HWCAP_S390_HIGH_GPRS)) \
|
|
{ \
|
|
unsigned long long stfle_bits; \
|
|
S390_STORE_STFLE (stfle_bits); \
|
|
\
|
|
if (S390_IS_Z196 (stfle_bits)) \
|
|
return &__##FUNC##_z196; \
|
|
else if (S390_IS_Z10 (stfle_bits)) \
|
|
return &__##FUNC##_z10; \
|
|
else \
|
|
return &__##FUNC##_default; \
|
|
} \
|
|
else \
|
|
return &__##FUNC##_default; \
|
|
}
|
|
|
|
#define s390_vx_libc_ifunc(FUNC) \
|
|
s390_vx_libc_ifunc2(FUNC, FUNC)
|
|
|
|
#define s390_vx_libc_ifunc2(RESOLVERFUNC, FUNC) \
|
|
/* Make the declarations of the optimized functions hidden in order
|
|
to prevent GOT slots being generated for them. */ \
|
|
extern __typeof (FUNC) RESOLVERFUNC##_vx attribute_hidden; \
|
|
extern __typeof (FUNC) RESOLVERFUNC##_c attribute_hidden; \
|
|
extern void *__resolve_##RESOLVERFUNC (unsigned long int) __asm__ (#FUNC); \
|
|
\
|
|
void *__resolve_##RESOLVERFUNC (unsigned long int dl_hwcap) \
|
|
{ \
|
|
if (dl_hwcap & HWCAP_S390_VX) \
|
|
return &RESOLVERFUNC##_vx; \
|
|
else \
|
|
return &RESOLVERFUNC##_c; \
|
|
} \
|
|
__asm__ (".type " #FUNC ", %gnu_indirect_function");
|