diff options
| -rw-r--r-- | INSTALL | 4 | ||||
| -rw-r--r-- | manual/install.texi | 3 | ||||
| -rwxr-xr-x | sysdeps/unix/sysv/linux/aarch64/vltest.py | 82 |
3 files changed, 89 insertions, 0 deletions
diff --git a/INSTALL b/INSTALL index 065a568585..bc761ab98b 100644 --- a/INSTALL +++ b/INSTALL @@ -380,6 +380,10 @@ the same syntax as 'test-wrapper-env', the only difference in its semantics being starting with an empty set of environment variables rather than the ambient set. + For AArch64 with SVE, when testing the GNU C Library, 'test-wrapper' +may be set to "SRCDIR/sysdeps/unix/sysv/linux/aarch64/vltest.py +VECTOR-LENGTH" to change Vector Length. + Installing the C Library ======================== diff --git a/manual/install.texi b/manual/install.texi index eb41fbd0b5..f1d858fb78 100644 --- a/manual/install.texi +++ b/manual/install.texi @@ -418,6 +418,9 @@ use has the same syntax as @samp{test-wrapper-env}, the only difference in its semantics being starting with an empty set of environment variables rather than the ambient set. +For AArch64 with SVE, when testing @theglibc{}, @samp{test-wrapper} +may be set to "@var{srcdir}/sysdeps/unix/sysv/linux/aarch64/vltest.py +@var{vector-length}" to change Vector Length. @node Running make install @appendixsec Installing the C Library diff --git a/sysdeps/unix/sysv/linux/aarch64/vltest.py b/sysdeps/unix/sysv/linux/aarch64/vltest.py new file mode 100755 index 0000000000..bed62ad151 --- /dev/null +++ b/sysdeps/unix/sysv/linux/aarch64/vltest.py @@ -0,0 +1,82 @@ +#!/usr/bin/python3 +# Set Scalable Vector Length test helper +# Copyright (C) 2021 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 +# <https://www.gnu.org/licenses/>. +"""Set Scalable Vector Length test helper. + +Set Scalable Vector Length for child process. + +examples: + +~/build$ make check subdirs=string \ +test-wrapper='~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 16' + +~/build$ ~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 16 \ +make test t=string/test-memcpy + +~/build$ ~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 32 \ +./debugglibc.sh string/test-memmove + +~/build$ ~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 64 \ +./testrun.sh string/test-memset +""" +import argparse +from ctypes import cdll, CDLL +import os +import sys + +EXIT_SUCCESS = 0 +EXIT_FAILURE = 1 +EXIT_UNSUPPORTED = 77 + +AT_HWCAP = 16 +HWCAP_SVE = (1 << 22) + +PR_SVE_GET_VL = 51 +PR_SVE_SET_VL = 50 +PR_SVE_SET_VL_ONEXEC = (1 << 18) +PR_SVE_VL_INHERIT = (1 << 17) +PR_SVE_VL_LEN_MASK = 0xffff + +def main(args): + libc = CDLL("libc.so.6") + if not libc.getauxval(AT_HWCAP) & HWCAP_SVE: + print("CPU doesn't support SVE") + sys.exit(EXIT_UNSUPPORTED) + + libc.prctl(PR_SVE_SET_VL, + args.vl[0] | PR_SVE_SET_VL_ONEXEC | PR_SVE_VL_INHERIT) + os.execvp(args.args[0], args.args) + print("exec system call failure") + sys.exit(EXIT_FAILURE) + +if __name__ == '__main__': + parser = argparse.ArgumentParser(description= + "Set Scalable Vector Length test helper", + formatter_class=argparse.ArgumentDefaultsHelpFormatter) + + # positional argument + parser.add_argument("vl", nargs=1, type=int, + choices=range(16, 257, 16), + help=('vector length '\ + 'which is multiples of 16 from 16 to 256')) + # remainDer arguments + parser.add_argument('args', nargs=argparse.REMAINDER, + help=('args '\ + 'which is passed to child process')) + args = parser.parse_args() + main(args) |