| /* IFUNC resolver function for CPU specific functions. |
| 32 bit S/390 version. |
| Copyright (C) 2012-2014 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 void *FUNC##_z196 attribute_hidden; \ |
| extern void *FUNC##_z10 attribute_hidden; \ |
| extern void *FUNC##_g5 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)) \ |
| { \ |
| /* We want just 1 double word to be returned. */ \ |
| register unsigned long reg0 asm("0") = 0; \ |
| unsigned long long stfle_bits; \ |
| \ |
| asm volatile(".insn s,0xb2b00000,%0" "\n\t" /* stfle */ \ |
| : "=QS" (stfle_bits), "+d" (reg0) \ |
| : : "cc"); \ |
| \ |
| if ((stfle_bits & (1ULL << (63 - STFLE_BITS_Z196))) != 0) \ |
| return &FUNC##_z196; \ |
| else if ((stfle_bits & (1ULL << (63 - STFLE_BITS_Z10))) != 0) \ |
| return &FUNC##_z10; \ |
| } \ |
| return &FUNC##_g5; \ |
| } |
| |
| 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 |
