diff options
Diffstat (limited to 'sysdeps/s390/s390-32/multiarch/ifunc-resolve.c')
| -rw-r--r-- | sysdeps/s390/s390-32/multiarch/ifunc-resolve.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/sysdeps/s390/s390-32/multiarch/ifunc-resolve.c b/sysdeps/s390/s390-32/multiarch/ifunc-resolve.c new file mode 100644 index 0000000000..fd6e367065 --- /dev/null +++ b/sysdeps/s390/s390-32/multiarch/ifunc-resolve.c @@ -0,0 +1,69 @@ +/* IFUNC resolver function for CPU specific functions. + 32 bit S/390 version. + Copyright (C) 2012 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"); \ + \ + extern void *FUNC##_z10; \ + extern void *FUNC##_z196; \ + extern void *FUNC##_g5; \ + \ + void *resolve_##FUNC (unsigned long int dl_hwcap) \ + { \ + if ((dl_hwcap & HWCAP_S390_STFLE) \ + && (dl_hwcap & HWCAP_S390_HIGH_GPRS)) /* Implies zarch */ \ + { \ + /* 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 |