+++ /dev/null
-#!/bin/sh
-
-# Check if the passed in (CAPABILITY_WORD) matches a value found in the
-# current hwcap aux vector.
-
-# return '0' to indicate the capability was found.
-# return '1' for not found, or any other error condition.
-
-CAPABILITY_WORD=$1
-
-# SANITY CHECK Begin:
-# These are potential hwcap values as found in the glibc dl-procinfo.c
-# sources as of July 2015.
-P_HWCAP_1=" vsx arch_2_06 power6x dfp pa6t arch_2_05 ic_snoop smt booke"
-P_HWCAP_2=" cellbe power5+ power5 power4 notb efpdouble efpsingle spe"
-P_HWCAP_3=" ucache 4xxmac mmu fpu altivec ppc601 ppc64 ppc32 "
-P_HWCAP2_1=" tar isel ebb dscr htm arch_2_07 arch_3_00 "
-# Additional entries as of ... future
-P_HWCAP2_2=" arch_3_1 mma "
-CAPABILITY_FOUND="no"
-for POTENTIAL_CAP in $P_HWCAP_1 $P_HWCAP_2 $P_HWCAP_3 $P_HWCAP2_1 $P_HWCAP2_2 ; do
- if [ "x$CAPABILITY_WORD" = "x$POTENTIAL_CAP" ]; then
- CAPABILITY_FOUND="yes"
- break
- fi
-done
-if [ x$CAPABILITY_FOUND = "xno" ]; then
- echo "Warning: did not find $CAPABILITY_WORD in the potential capabilities list."
- echo " LD_SHOW_AUXV=1 /bin/true | grep ^AT_HWCAP "
- echo " Double-check that the input value [$CAPABILITY_WORD] is valid."
-fi
-# SANITY CHECK End
-
-# Capability Check Begin:
-LD_SHOW_AUXV=1 /bin/true | grep ^AT_HWCAP | grep -w $CAPABILITY_WORD 2>&1 > /dev/null
-if [ "$?" -eq "0" ]; then
- #echo "found the capability"
- exit 0
-elif [ "$?" -eq "2" ]; then
- # echo "grep failure"
- exit 1
-else
- #echo "did not find the capability"
- exit 1
-fi
-
--- /dev/null
+/* ---------------------------------------------------------------------
+ This file is part of Valgrind, a dynamic binary instrumentation
+ framework.
+
+ Copyright (C) 2026 Abhay Kandpal <abhay@linux.ibm.com>
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 3 of the
+ License, or (at your option) any later version.
+
+ This program 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, see <http://www.gnu.org/licenses/>.
+
+ The GNU General Public License is contained in the file COPYING.
+ ------------------------------------------------------------------ */
+
+/* check_ppc64_auxv_cap.c
+
+ Replacement for the historical 'tests/check_ppc64_auxv_cap' shell
+ script. Used as a .vgtest 'prereq:' helper by ~51 tests under
+ none/tests/ppc{32,64}/ and memcheck/tests/ppc{32,64}/ to decide,
+ at test-run time, whether the host machine supports a given
+ PowerPC capability (altivec, vsx, dfp, arch_2_05, arch_2_06,
+ arch_2_07, arch_3_00, arch_3_1, htm, mma).
+
+ The original shell script parsed the textual output of
+ LD_SHOW_AUXV=1 /bin/true | grep ^AT_HWCAP
+ for human-readable capability words such as 'altivec'. glibc 2.42
+ removed the PowerPC-specific _dl_procinfo() hook (formerly in
+ sysdeps/powerpc/dl-procinfo.h, commits 6cb703b / 1d60b9d), so
+ LD_SHOW_AUXV now prints raw hex for AT_HWCAP / AT_HWCAP2 and the
+ 'grep -w altivec' pattern in the script never matches. The
+ resulting non-zero exit caused vg_regtest.in to skip every test
+ that depends on this prereq, silently disabling essentially the
+ whole PowerPC instruction-level regression suite.
+
+ This C version uses getauxval() to read AT_HWCAP / AT_HWCAP2
+ directly. That is the documented, stable interface to the auxv,
+ and it is unaffected by the glibc change.
+
+ Calling convention (preserved from the old script so the existing
+ .vgtest files need no modification):
+ check_ppc64_auxv_cap <capability>
+ exit code 0 - capability is present
+ exit code 1 - capability is absent, unknown, or usage error
+*/
+
+#include "config.h"
+#include <stdio.h>
+#include <string.h>
+
+#ifdef HAVE_GETAUXVAL
+
+#include <sys/auxv.h>
+
+/* Capability bit table. Values are taken from
+ /usr/include/bits/hwcap.h on a glibc-2.41-or-earlier system, and
+ cross-checked against arch/powerpc/include/uapi/asm/cputable.h in
+ the Linux kernel. AT_HWCAP / AT_HWCAP2 bit assignments are part of
+ the kernel ABI and are stable, so it is safe to hardcode them here
+ rather than depend on the PowerPC-specific bits/hwcap.h header
+ being installed at build time. */
+
+typedef
+ struct {
+ const char* name;
+ unsigned long type; /* AT_HWCAP or AT_HWCAP2 */
+ unsigned long bit;
+ }
+ CapEntry;
+
+static const CapEntry cap_table[] = {
+ /* AT_HWCAP */
+ { "altivec", AT_HWCAP, 0x10000000UL },
+ { "vsx", AT_HWCAP, 0x00000080UL },
+ { "dfp", AT_HWCAP, 0x00000400UL },
+ { "arch_2_05", AT_HWCAP, 0x00001000UL },
+ { "arch_2_06", AT_HWCAP, 0x00000100UL },
+ /* AT_HWCAP2 */
+ { "arch_2_07", AT_HWCAP2, 0x80000000UL },
+ { "arch_3_00", AT_HWCAP2, 0x00800000UL },
+ { "arch_3_1", AT_HWCAP2, 0x00040000UL },
+ { "htm", AT_HWCAP2, 0x40000000UL },
+ { "mma", AT_HWCAP2, 0x00020000UL },
+};
+
+#define N_CAP_TABLE (sizeof cap_table / sizeof cap_table[0])
+
+int main(int argc, char** argv)
+{
+ unsigned int i;
+ unsigned long hwcap;
+ const char* progname
+ = (argc > 0 && argv[0] != NULL) ? argv[0] : "check_ppc64_auxv_cap";
+
+ if (argc != 2) {
+ fprintf(stderr, "usage: %s <capability>\n", progname);
+ return 1;
+ }
+
+ for (i = 0; i < N_CAP_TABLE; i++) {
+ if (strcmp(argv[1], cap_table[i].name) == 0) {
+ hwcap = getauxval(cap_table[i].type);
+ return (hwcap & cap_table[i].bit) ? 0 : 1;
+ }
+ }
+
+ /* Unknown capability name. Report 'not found', matching the
+ behaviour of the original grep-based script when the requested
+ capability word did not appear in the LD_SHOW_AUXV output. */
+ fprintf(stderr, "%s: unknown capability '%s'\n", progname, argv[1]);
+ return 1;
+}
+
+#else /* !HAVE_GETAUXVAL */
+
+/* getauxval() is not available on this platform (e.g. FreeBSD, Solaris,
+ macOS). None of those platforms currently use Valgrind's PowerPC
+ port, but the program must still build and link there. Return 1 for
+ every query - equivalent to "capability not detected" - which causes
+ the .vgtest harness to skip any test using this as a prereq. */
+
+int main(int argc, char** argv)
+{
+ (void)argc;
+ (void)argv;
+ return 1;
+}
+
+#endif /* HAVE_GETAUXVAL */
projects / thirdparty / valgrind.git / commitdiff
