| xf.li | bfc6e71 | 2025-02-07 01:54:34 -0800 | [diff] [blame^] | 1 | /* IFUNC resolver function for CPU specific functions. |
| 2 | 32/64 bit S/390 version. |
| 3 | Copyright (C) 2015-2016 Free Software Foundation, Inc. |
| 4 | This file is part of the GNU C Library. |
| 5 | |
| 6 | The GNU C Library is free software; you can redistribute it and/or |
| 7 | modify it under the terms of the GNU Lesser General Public |
| 8 | License as published by the Free Software Foundation; either |
| 9 | version 2.1 of the License, or (at your option) any later version. |
| 10 | |
| 11 | The GNU C Library is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | Lesser General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU Lesser General Public |
| 17 | License along with the GNU C Library; if not, see |
| 18 | <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include <unistd.h> |
| 21 | #include <dl-procinfo.h> |
| 22 | |
| 23 | #define S390_STFLE_BITS_Z10 34 /* General instructions extension */ |
| 24 | #define S390_STFLE_BITS_Z196 45 /* Distinct operands, pop ... */ |
| 25 | |
| 26 | #define S390_IS_Z196(STFLE_BITS) \ |
| 27 | ((STFLE_BITS & (1ULL << (63 - S390_STFLE_BITS_Z196))) != 0) |
| 28 | |
| 29 | #define S390_IS_Z10(STFLE_BITS) \ |
| 30 | ((STFLE_BITS & (1ULL << (63 - S390_STFLE_BITS_Z10))) != 0) |
| 31 | |
| 32 | #define S390_STORE_STFLE(STFLE_BITS) \ |
| 33 | /* We want just 1 double word to be returned. */ \ |
| 34 | register unsigned long reg0 __asm__("0") = 0; \ |
| 35 | \ |
| 36 | __asm__ __volatile__(".machine push" "\n\t" \ |
| 37 | ".machine \"z9-109\"" "\n\t" \ |
| 38 | ".machinemode \"zarch_nohighgprs\"\n\t" \ |
| 39 | "stfle %0" "\n\t" \ |
| 40 | ".machine pop" "\n" \ |
| 41 | : "=QS" (STFLE_BITS), "+d" (reg0) \ |
| 42 | : : "cc"); |
| 43 | |
| 44 | #define s390_libc_ifunc(FUNC) \ |
| 45 | __asm__ (".globl " #FUNC "\n\t" \ |
| 46 | ".type " #FUNC ",@gnu_indirect_function\n\t" \ |
| 47 | ".set " #FUNC ",__resolve_" #FUNC "\n\t" \ |
| 48 | ".globl __GI_" #FUNC "\n\t" \ |
| 49 | ".set __GI_" #FUNC "," #FUNC "\n"); \ |
| 50 | \ |
| 51 | /* Make the declarations of the optimized functions hidden in order |
| 52 | to prevent GOT slots being generated for them. */ \ |
| 53 | extern void *__##FUNC##_z196 attribute_hidden; \ |
| 54 | extern void *__##FUNC##_z10 attribute_hidden; \ |
| 55 | extern void *__##FUNC##_default attribute_hidden; \ |
| 56 | \ |
| 57 | void *__resolve_##FUNC (unsigned long int dl_hwcap) \ |
| 58 | { \ |
| 59 | if ((dl_hwcap & HWCAP_S390_STFLE) \ |
| 60 | && (dl_hwcap & HWCAP_S390_ZARCH) \ |
| 61 | && (dl_hwcap & HWCAP_S390_HIGH_GPRS)) \ |
| 62 | { \ |
| 63 | unsigned long long stfle_bits; \ |
| 64 | S390_STORE_STFLE (stfle_bits); \ |
| 65 | \ |
| 66 | if (S390_IS_Z196 (stfle_bits)) \ |
| 67 | return &__##FUNC##_z196; \ |
| 68 | else if (S390_IS_Z10 (stfle_bits)) \ |
| 69 | return &__##FUNC##_z10; \ |
| 70 | else \ |
| 71 | return &__##FUNC##_default; \ |
| 72 | } \ |
| 73 | else \ |
| 74 | return &__##FUNC##_default; \ |
| 75 | } |
| 76 | |
| 77 | #define s390_vx_libc_ifunc(FUNC) \ |
| 78 | s390_vx_libc_ifunc2(FUNC, FUNC) |
| 79 | |
| 80 | #define s390_vx_libc_ifunc2(RESOLVERFUNC, FUNC) \ |
| 81 | /* Make the declarations of the optimized functions hidden in order |
| 82 | to prevent GOT slots being generated for them. */ \ |
| 83 | extern __typeof (FUNC) RESOLVERFUNC##_vx attribute_hidden; \ |
| 84 | extern __typeof (FUNC) RESOLVERFUNC##_c attribute_hidden; \ |
| 85 | extern void *__resolve_##RESOLVERFUNC (unsigned long int) __asm__ (#FUNC); \ |
| 86 | \ |
| 87 | void *__resolve_##RESOLVERFUNC (unsigned long int dl_hwcap) \ |
| 88 | { \ |
| 89 | if (dl_hwcap & HWCAP_S390_VX) \ |
| 90 | return &RESOLVERFUNC##_vx; \ |
| 91 | else \ |
| 92 | return &RESOLVERFUNC##_c; \ |
| 93 | } \ |
| 94 | __asm__ (".type " #FUNC ", %gnu_indirect_function"); |