141 lines
4.8 KiB
Diff
141 lines
4.8 KiB
Diff
commit 38560563587ad8eafa700c56800ff844f18fbad1
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Author: Naohiro Tamura <naohirot@fujitsu.com>
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Date: Thu May 20 07:34:37 2021 +0000
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aarch64: Added Vector Length Set test helper script
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This patch is a test helper script to change Vector Length for child
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process. This script can be used as test-wrapper for 'make check'.
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Usage 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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diff --git a/INSTALL b/INSTALL
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index 065565093bd76d5b..b3a4370f592c5047 100644
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--- a/INSTALL
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+++ b/INSTALL
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@@ -387,6 +387,10 @@ the same syntax as 'test-wrapper-env', the only difference in its
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semantics being starting with an empty set of environment variables
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rather than the ambient set.
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+ For AArch64 with SVE, when testing the GNU C Library, 'test-wrapper'
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+may be set to "SRCDIR/sysdeps/unix/sysv/linux/aarch64/vltest.py
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+VECTOR-LENGTH" to change Vector Length.
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+
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Installing the C Library
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========================
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diff --git a/manual/install.texi b/manual/install.texi
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index 7e9f2be150e6f98a..c262fd56d0cef67b 100644
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--- a/manual/install.texi
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+++ b/manual/install.texi
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@@ -425,6 +425,9 @@ use has the same syntax as @samp{test-wrapper-env}, the only
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difference in its semantics being starting with an empty set of
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environment variables rather than the ambient set.
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+For AArch64 with SVE, when testing @theglibc{}, @samp{test-wrapper}
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+may be set to "@var{srcdir}/sysdeps/unix/sysv/linux/aarch64/vltest.py
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+@var{vector-length}" to change Vector Length.
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@node Running make install
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@appendixsec Installing the C Library
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diff --git a/sysdeps/unix/sysv/linux/aarch64/vltest.py b/sysdeps/unix/sysv/linux/aarch64/vltest.py
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new file mode 100755
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index 0000000000000000..bed62ad151e06868
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--- /dev/null
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+++ b/sysdeps/unix/sysv/linux/aarch64/vltest.py
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@@ -0,0 +1,82 @@
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+#!/usr/bin/python3
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+# Set Scalable Vector Length test helper
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+# Copyright (C) 2021 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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+
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+Set Scalable Vector Length for child process.
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+
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+examples:
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+AT_HWCAP = 16
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+HWCAP_SVE = (1 << 22)
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+
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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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+
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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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+
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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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+
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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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+
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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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