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Fri, 04 Apr 2025 17:50:06 -0700 (PDT) Received: from localhost ([2804:14d:7e39:8209:7091:f5fc:7d55:fdf9]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-229785bffd4sm39032785ad.57.2025.04.04.17.50.05 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Apr 2025 17:50:05 -0700 (PDT) From: Thiago Jung Bauermann To: gdb-patches@sourceware.org Subject: [PATCH] gdb/testsuite: Add gdb.arch/aarch64-sve-vg-sigunwind.exp Date: Fri, 4 Apr 2025 21:50:03 -0300 Message-ID: <20250405005003.752820-1-thiago.bauermann@linaro.org> X-Mailer: git-send-email 2.49.0 MIME-Version: 1.0 X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~patch=linaro.org@sourceware.org There's currently not test for unwinding the VG register from a signal frame, so add one. All tests in the testcase pass. Tested on aarch64-linux-gnu native, native-gdbserver and native-extended-gdbserver. --- .../gdb.arch/aarch64-sve-vg-sigunwind.c | 87 +++++++++++++++++++ .../gdb.arch/aarch64-sve-vg-sigunwind.exp | 55 ++++++++++++ 2 files changed, 142 insertions(+) create mode 100644 gdb/testsuite/gdb.arch/aarch64-sve-vg-sigunwind.c create mode 100644 gdb/testsuite/gdb.arch/aarch64-sve-vg-sigunwind.exp base-commit: 4fa9476ad23d5868c2bc4c02dc1a73acaefbcbc2 diff --git a/gdb/testsuite/gdb.arch/aarch64-sve-vg-sigunwind.c b/gdb/testsuite/gdb.arch/aarch64-sve-vg-sigunwind.c new file mode 100644 index 000000000000..f2403ae448d1 --- /dev/null +++ b/gdb/testsuite/gdb.arch/aarch64-sve-vg-sigunwind.c @@ -0,0 +1,87 @@ +/* This testcase is part of GDB, the GNU debugger. + + Copyright 2025 Free Software Foundation, Inc. + + 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 . */ + +/* Exercise unwinding AArch64's Scalable Vector Extension VG register. */ + +#include +#include +#include /* For SVE_VL_MAX. */ +#include +#include +#include + +static int max_vl = 0; + +/* Set new value for the SVE vector length. + Return the value that was set. */ + +static int +set_vl (int vl) +{ + int rc; + + rc = prctl (PR_SVE_SET_VL, vl, 0, 0, 0); + if (rc < 0) + { + perror ("FAILED to PR_SVE_SET_VL"); + exit (EXIT_FAILURE); + } + + return rc & PR_SVE_VL_LEN_MASK; +} + +static void +sighandler (int) +{ + int current_vl; + + /* Decrease vector length by 16 bytes. */ + printf ("sighandler: setting to %d\n", max_vl - 16); + current_vl = set_vl (max_vl - 16); + printf ("sighandler: current_vl = %d\n", current_vl); /* Break here. */ +} + +int +main (int argc, char *argv[]) +{ + /* Set vector length to the maximum size allowed. */ + max_vl = set_vl (SVE_VL_MAX); + + printf ("main: max_vl = %d\n", max_vl); + + /* If maximum VL is less than 32 bytes we can't decrease it in the signal + handler. */ + if (max_vl < 32) + return 1; + + unsigned char buf[256]; + + /* Use an SVE register to make the kernel start saving the SVE bank. */ + asm volatile ("mov z0.b, #255\n\t" + "str z0, %0" + : + : "m" (buf) + : "z0", "memory"); + + struct sigaction sigact; + sigact.sa_handler = sighandler; + sigaction (SIGUSR1, &sigact, NULL); + + kill (getpid (), SIGUSR1); + + return 0; +} diff --git a/gdb/testsuite/gdb.arch/aarch64-sve-vg-sigunwind.exp b/gdb/testsuite/gdb.arch/aarch64-sve-vg-sigunwind.exp new file mode 100644 index 000000000000..7fea93ffbd58 --- /dev/null +++ b/gdb/testsuite/gdb.arch/aarch64-sve-vg-sigunwind.exp @@ -0,0 +1,55 @@ +# Copyright 2025 Free Software Foundation, Inc. + +# 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 . + +# Exercise unwinding AArch64's Scalable Vector Extension VG register. + +require allow_aarch64_sve_tests + +standard_testfile +if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} \ + [list debug additional_flags=-march=armv9-a]] } { + return +} + +# We want SIGUSR1 to be delivered normally. +gdb_test "handle SIGUSR1 nostop" \ + [multi_line {Signal Stop Print Pass to program Description} \ + {SIGUSR1 No Yes Yes User defined signal 1}] \ + "don't stop for SIGUSR1" + +set linespec ${srcfile}:[gdb_get_line_number "Break here."] + +if ![runto ${linespec}] { + return +} + +set max_vl [get_valueof "" "max_vl" 0] +set max_vg [expr $max_vl/8] + +# If maximum VL is less than 256 bits we can't decrease it in the signal +# handler and the test can't work. +if { $max_vl < 32 } { + untested "Maximum vector length is too small." + return +} + +set reduced_vg [expr "$max_vg - 2"] +gdb_test "print \$vg" ". = ${reduced_vg}" "vg was reduced" + +gdb_test "frame function main" \ + [multi_line "#$decimal $hex in main \[^\r\n\]+" \ + "$decimal\[ \t\]+kill \\(getpid \\(\\), SIGUSR1\\);"] + +gdb_test "print \$vg" ". = $max_vg" "vg was correctly unwound"