diff options
Diffstat (limited to 'sysdeps/s390/multiarch/ifunc-resolve.h')
| -rw-r--r-- | sysdeps/s390/multiarch/ifunc-resolve.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/sysdeps/s390/multiarch/ifunc-resolve.h b/sysdeps/s390/multiarch/ifunc-resolve.h new file mode 100644 index 0000000000..744a0d8d6d --- /dev/null +++ b/sysdeps/s390/multiarch/ifunc-resolve.h @@ -0,0 +1,94 @@ +/* IFUNC resolver function for CPU specific functions. + 32/64 bit S/390 version. + Copyright (C) 2015-2016 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"); |