[PATCH 3/5] gdb/testsuite: Add gdb.arch/aarch64-mops-watchpoint.exp
Thiago Jung Bauermann
thiago.bauermann@linaro.org
Sat May 4 00:05:19 GMT 2024
Test behaviour of watchpoints triggered by MOPS instructions. This test
is similar to gdb.base/memops-watchpoint.exp, but specifically for MOPS
instructions rather than whatever instructions are used in the libc's
implementation of memset/memcpy/memmove.
There's a separate watched variable for each set of instructions so that
the testcase can test whether GDB correctly identified the watchpoint
that triggered in each case.
---
.../gdb.arch/aarch64-mops-watchpoint.c | 66 ++++++++++++++++
.../gdb.arch/aarch64-mops-watchpoint.exp | 79 +++++++++++++++++++
gdb/testsuite/lib/gdb.exp | 61 ++++++++++++++
3 files changed, 206 insertions(+)
create mode 100644 gdb/testsuite/gdb.arch/aarch64-mops-watchpoint.c
create mode 100644 gdb/testsuite/gdb.arch/aarch64-mops-watchpoint.exp
diff --git a/gdb/testsuite/gdb.arch/aarch64-mops-watchpoint.c b/gdb/testsuite/gdb.arch/aarch64-mops-watchpoint.c
new file mode 100644
index 000000000000..b981f033d210
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/aarch64-mops-watchpoint.c
@@ -0,0 +1,66 @@
+/* This test program is part of GDB, the GNU debugger.
+
+ Copyright 2024 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 <http://www.gnu.org/licenses/>. */
+
+int
+main (void)
+{
+ char source[40] __attribute__ ((aligned (8)))
+ = "This is a relatively long string...";
+ char a[40] __attribute__ ((aligned (8)))
+ = "String to be overwritten with zeroes";
+ char b[40] __attribute__ ((aligned (8)))
+ = "Another string to be memcopied...";
+ char c[40] __attribute__ ((aligned (8)))
+ = "Another string to be memmoved...";
+ char *p, *q;
+ long size, zero;
+
+ /* Break here. */
+ p = a;
+ size = sizeof (a);
+ zero = 0;
+ /* memset implemented in MOPS instructions. */
+ __asm__ volatile ("setp [%0]!, %1!, %2\n\t"
+ "setm [%0]!, %1!, %2\n\t"
+ "sete [%0]!, %1!, %2\n\t"
+ : "+&r"(p), "+&r"(size)
+ : "r"(zero)
+ : "memory");
+
+ p = b;
+ q = source;
+ size = sizeof (b);
+ /* memmove implemented in MOPS instructions. */
+ __asm__ volatile ("cpyp [%0]!, [%1]!, %2!\n\t"
+ "cpym [%0]!, [%1]!, %2!\n\t"
+ "cpye [%0]!, [%1]!, %2!\n\t"
+ : "+&r" (p), "+&r" (q), "+&r" (size)
+ :
+ : "memory");
+ p = c;
+ q = source;
+ size = sizeof (c);
+ /* memcpy implemented in MOPS instructions. */
+ __asm__ volatile ("cpyfp [%0]!, [%1]!, %2!\n\t"
+ "cpyfm [%0]!, [%1]!, %2!\n\t"
+ "cpyfe [%0]!, [%1]!, %2!\n\t"
+ : "+&r" (p), "+&r" (q), "+&r" (size)
+ :
+ : "memory");
+
+ return 0;
+}
diff --git a/gdb/testsuite/gdb.arch/aarch64-mops-watchpoint.exp b/gdb/testsuite/gdb.arch/aarch64-mops-watchpoint.exp
new file mode 100644
index 000000000000..9e210602d800
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/aarch64-mops-watchpoint.exp
@@ -0,0 +1,79 @@
+# Copyright 2024 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 <http://www.gnu.org/licenses/>.
+
+# Test a binary that uses MOPS (Memory Operations) instructions.
+# This test is similar to gdb.base/memops-watchpoint.exp, but specifically
+# tests MOPS instructions rather than whatever instructions are used in the
+# system libc's implementation of memset/memcpy/memmove.
+
+require allow_hw_watchpoint_tests allow_aarch64_mops_tests
+
+standard_testfile
+
+if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} \
+ [list debug additional_flags=-march=armv9.3-a]] } {
+ return -1
+}
+
+set linespec ${srcfile}:[gdb_get_line_number "Break here"]
+if ![runto ${linespec}] {
+ return -1
+}
+
+gdb_test "watch -location a\[28\]" \
+ "(Hardware w|W)atchpoint ${decimal}: -location a\\\[28\\\]" \
+ "set watch on a"
+gdb_test "watch -location b\[28\]" \
+ "(Hardware w|W)atchpoint ${decimal}: -location b\\\[28\\\]" \
+ "set watchpoint on b"
+gdb_test "watch -location c\[28\]" \
+ "(Hardware w|W)atchpoint ${decimal}: -location c\\\[28\\\]" \
+ "set watchpoint on c"
+
+gdb_test "continue" \
+ [multi_line \
+ "Continuing\\." \
+ "" \
+ "Hardware watchpoint ${decimal}: -location a\\\[28\\\]" \
+ "" \
+ "Old value = 104 'h'" \
+ "New value = 0 '\\\\000'" \
+ "$hex in main \\(\\) at .*aarch64-mops-watchpoint.c:$decimal" \
+ "${decimal}\\s+__asm__ volatile \\(\"setp.*\\\\n\\\\t\""] \
+ "continue until set watchpoint hits"
+
+gdb_test "continue" \
+ [multi_line \
+ "Continuing\\." \
+ "" \
+ "Hardware watchpoint ${decimal}: -location b\\\[28\\\]" \
+ "" \
+ "Old value = 101 'e'" \
+ "New value = 114 'r'" \
+ "$hex in main \\(\\) at .*aarch64-mops-watchpoint.c:$decimal" \
+ "${decimal}\\s+__asm__ volatile \\(\"cpyp.*\\\\n\\\\t\""] \
+ "continue until cpy watchpoint hits"
+
+gdb_test "continue" \
+ [multi_line \
+ "Continuing\\." \
+ "" \
+ "Hardware watchpoint ${decimal}: -location c\\\[28\\\]" \
+ "" \
+ "Old value = 100 'd'" \
+ "New value = 114 'r'" \
+ "$hex in main \\(\\) at .*aarch64-mops-watchpoint.c:$decimal" \
+ "${decimal}\\s+__asm__ volatile \\(\"cpyfp.*\\\\n\\\\t\""] \
+ "continue until cpyf watchpoint hits"
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index fe3f05c18df9..78c926ac80b6 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -4497,6 +4497,67 @@ proc aarch64_supports_sme_svl { length } {
return 1
}
+# Run a test on the target to see if it supports Aarch64 MOPS (Memory
+# Operations) extensions. Return 0 if so, 1 if it does not. Note this causes
+# a restart of GDB.
+
+gdb_caching_proc allow_aarch64_mops_tests {} {
+ global srcdir subdir gdb_prompt inferior_exited_re
+
+ set me "allow_aarch64_mops_tests"
+
+ if { ![is_aarch64_target]} {
+ return 0
+ }
+
+ # ARMv9.3-A contains the MOPS extension. The test program doesn't use it,
+ # but take the opportunity to check whether the toolchain knows about MOPS.
+ set compile_flags "{additional_flags=-march=armv9.3-a}"
+
+ # Compile a program that tests the MOPS feature.
+ set src {
+ #include <stdbool.h>
+ #include <sys/auxv.h>
+
+ #ifndef HWCAP2_MOPS
+ #define HWCAP2_MOPS (1UL << 43)
+ #endif
+
+ int main() {
+ bool mops_supported = getauxval (AT_HWCAP2) & HWCAP2_MOPS;
+
+ return !mops_supported;
+ }
+ }
+
+ if {![gdb_simple_compile $me $src executable $compile_flags]} {
+ return 0
+ }
+
+ # Compilation succeeded so now run it via gdb.
+ clean_restart $obj
+ gdb_run_cmd
+ gdb_expect {
+ -re ".*$inferior_exited_re with code 01.*${gdb_prompt} $" {
+ verbose -log "\n$me mops support not detected"
+ set allow_mops_tests 0
+ }
+ -re ".*$inferior_exited_re normally.*${gdb_prompt} $" {
+ verbose -log "\n$me: mops support detected"
+ set allow_mops_tests 1
+ }
+ default {
+ warning "\n$me: default case taken"
+ set allow_mops_tests 0
+ }
+ }
+ gdb_exit
+ remote_file build delete $obj
+
+ verbose "$me: returning $allow_mops_tests" 2
+ return $allow_mops_tests
+}
+
# A helper that compiles a test case to see if __int128 is supported.
proc gdb_int128_helper {lang} {
return [gdb_can_simple_compile "i128-for-$lang" {
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