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The glibc-hwcaps subdirectories are extended by "z17". Libraries are loaded if the z17 facility bits are active: - Miscellaneous-instruction-extensions facility 4 - Vector-enhancements-facility 3 - Vector-Packed-Decimal-Enhancement Facility 3 - CPU: Concurrent-Functions Facility tst-glibc-hwcaps.c is extended in order to test z17 via new marker6. In case of running on a z17 with a kernel not recognizing z17 yet, AT_PLATFORM will be z900 but vector-bit in AT_HWCAP is set. This situation is now recognized and this testcase does not fail. A fatal glibc error is dumped if glibc was build with architecture level set for z17, but run on an older machine (See dl-hwcap-check.h). Note, you might get an SIGILL before this check if you don't use: configure --with-rtld-early-cflags=-march=<older-machine> ld.so --list-diagnostics now also dumps information about s390.cpu_features. Independent from z17, the s390x kernel won't introduce new HWCAP-Bits if there is no special handling needed in kernel itself. For z17, we don't have new HWCAP flags, but have to check the facility bits retrieved by stfle-instruction. Instead of storing all the stfle-bits (currently four 64bit values) in the cpu_features struct, we now only store those bits, which are needed within glibc itself. Note that we have this list twice, one with original values and the other one which can be filtered with GLIBC_TUNABLES=glibc.cpu.hwcaps. Those new fields are stored in so far reserved space in cpu_features struct. Thus processes started in between the update of glibc package and we e.g. have a new ld.so and an old libc.so, won't crash. The glibc internal ifunc-resolvers would not select the best optimized variant. The users of stfle-bits are also updated: - parsing of GLIBC_TUNABLES=glibc.cpu.hwcaps - glibc internal ifunc-resolvers - __libc_ifunc_impl_list - sysconf
76 lines
2.7 KiB
C
76 lines
2.7 KiB
C
/* Initialize cpu feature data. s390x version.
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Copyright (C) 2023-2025 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef __CPU_FEATURES_S390X_H
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# define __CPU_FEATURES_S390X_H
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/* The following stfle bit definitions are intended to be used for the
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glibc internal stfle_orig and stfle_filtered fields in cpu_features
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struct. They can't be used on the double words retrieved by the
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stfle-instruction. */
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/* Facility bit 34: z10: General instructions extension. */
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#define S390_STFLE_BIT34_Z10 (1ULL << 0)
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/* Facility bit 45: z196: Distinct operands, popcount, ... */
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#define S390_STFLE_BIT45_Z196 (1ULL << 1)
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/* Facility bit 61: arch13/z15: Miscellaneous-Instruction-Extensions
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Facility 3, e.g. mvcrl. */
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#define S390_STFLE_BIT61_ARCH13_MIE3 (1ULL << 2)
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/* Facility bit 84: arch15/z17: Miscellaneous-instruction-extensions
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facility 4 */
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#define S390_STFLE_BIT84_ARCH15_MIE4 (1ULL << 3)
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/* Facility bit 198: arch15/z17: Vector-enhancements-facility 3 */
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#define S390_STFLE_BIT198_ARCH15_VXRS_EXT3 (1ULL << 4)
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/* Facility bit 199: arch15/z17: Vector-Packed-Decimal-Enhancement
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Facility 3 */
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#define S390_STFLE_BIT199_ARCH15_VXRS_PDE3 (1ULL << 5)
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/* Facility bit 201: arch15/z17: CPU: Concurrent-Functions Facility */
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#define S390_STFLE_BIT201_ARCH15_CON (1ULL << 6)
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#define S390_IS_ARCH15(STFLE_BITS) \
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((((STFLE_BITS) & S390_STFLE_BIT84_ARCH15_MIE4) != 0) \
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&& (((STFLE_BITS) & S390_STFLE_BIT198_ARCH15_VXRS_EXT3) != 0) \
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&& (((STFLE_BITS) & S390_STFLE_BIT199_ARCH15_VXRS_PDE3) != 0) \
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&& (((STFLE_BITS) & S390_STFLE_BIT201_ARCH15_CON) != 0))
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#define S390_IS_ARCH13_MIE3(STFLE_BITS) \
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(((STFLE_BITS) & S390_STFLE_BIT61_ARCH13_MIE3) != 0)
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#define S390_IS_Z196(STFLE_BITS) \
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(((STFLE_BITS) & S390_STFLE_BIT45_Z196) != 0)
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#define S390_IS_Z10(STFLE_BITS) \
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(((STFLE_BITS) & S390_STFLE_BIT34_Z10) != 0)
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struct cpu_features
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{
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unsigned long int hwcap;
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unsigned long int __reserved_hwcap2;
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unsigned long long __reserved;
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unsigned long long stfle_orig;
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unsigned long long stfle_filtered;
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unsigned long long __reserved2[11];
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};
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#endif /* __CPU_FEATURES_S390X_H */
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