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83 lines
2.6 KiB
Python
Executable File
83 lines
2.6 KiB
Python
Executable File
#!/usr/bin/python3
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# Set Scalable Vector Length test helper
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# Copyright (C) 2021-2025 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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#
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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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#
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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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#
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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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"""Set Scalable Vector Length test helper.
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Set Scalable Vector Length for child process.
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examples:
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~/build$ make check subdirs=string \
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test-wrapper='~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 16'
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~/build$ ~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 16 \
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make test t=string/test-memcpy
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~/build$ ~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 32 \
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./debugglibc.sh string/test-memmove
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~/build$ ~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 64 \
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./testrun.sh string/test-memset
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"""
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import argparse
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from ctypes import cdll, CDLL
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import os
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import sys
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EXIT_SUCCESS = 0
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EXIT_FAILURE = 1
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EXIT_UNSUPPORTED = 77
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AT_HWCAP = 16
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HWCAP_SVE = (1 << 22)
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PR_SVE_GET_VL = 51
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PR_SVE_SET_VL = 50
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PR_SVE_SET_VL_ONEXEC = (1 << 18)
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PR_SVE_VL_INHERIT = (1 << 17)
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PR_SVE_VL_LEN_MASK = 0xffff
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def main(args):
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libc = CDLL("libc.so.6")
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if not libc.getauxval(AT_HWCAP) & HWCAP_SVE:
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print("CPU doesn't support SVE")
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sys.exit(EXIT_UNSUPPORTED)
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libc.prctl(PR_SVE_SET_VL,
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args.vl[0] | PR_SVE_SET_VL_ONEXEC | PR_SVE_VL_INHERIT)
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os.execvp(args.args[0], args.args)
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print("exec system call failure")
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sys.exit(EXIT_FAILURE)
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if __name__ == '__main__':
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parser = argparse.ArgumentParser(description=
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"Set Scalable Vector Length test helper",
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formatter_class=argparse.ArgumentDefaultsHelpFormatter)
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# positional argument
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parser.add_argument("vl", nargs=1, type=int,
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choices=range(16, 257, 16),
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help=('vector length '\
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'which is multiples of 16 from 16 to 256'))
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# remainDer arguments
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parser.add_argument('args', nargs=argparse.REMAINDER,
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help=('args '\
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'which is passed to child process'))
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args = parser.parse_args()
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main(args)
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