--- /dev/null
+/* This test program is part of GDB, the GNU debugger.
+
+ Copyright 2024-2026 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/>. */
+
+#include <stdint.h>
+
+#define PREPARE_REGS(X, Y, Z) \
+ __asm__ volatile ("mov x19, %0\n" : : "r"(X): "x19"); \
+ __asm__ volatile ("mov x20, %0\n" : : "r"(Y): "x20"); \
+ __asm__ volatile ("mov x21, %0\n" : : "r"(Z): "x21");
+
+int
+main (void)
+{
+ const uint64_t a = 0x0123456789abcdef;
+ const uint64_t b = 0xfedbca9876543210;
+ const uint64_t c = 0xdeadbeefc001face;
+
+ PREPARE_REGS (a, b, c);
+ /* Before abs. */
+ __asm__ volatile ("abs x19, x21\n" ::: "x19");
+ /* After abs. */
+
+ PREPARE_REGS (a, b, c);
+ /* Before cnt. */
+ __asm__ volatile ("cnt x19, x20\n" : :: "x19");
+ /* After cnt. */
+
+ PREPARE_REGS (a, b, c);
+ /* Before ctz. */
+ __asm__ volatile ("ctz x19, x20\n" : :: "x19");
+ /* After ctz. */
+
+ PREPARE_REGS (a, b, c);
+ /* Before smax-1. */
+ __asm__ volatile ("smax x19, x20, #10\n" : :: "x19");
+ /* After smax-1. */
+
+ PREPARE_REGS (a, b, c);
+ /* Before smax-2. */
+ __asm__ volatile ("smax x19, x20, x21\n" : :: "x19");
+ /* After smax-2. */
+
+ PREPARE_REGS (a, b, c);
+ /* Before smin-1. */
+ __asm__ volatile ("smin x19, x20, #10\n" : :: "x19");
+ /* After smin-1. */
+
+ PREPARE_REGS (a, b, c);
+ /* Before smin-2. */
+ __asm__ volatile ("smin x19, x20, x21\n" : :: "x19");
+ /* After smin-2. */
+
+ PREPARE_REGS (a, b, c);
+ /* Before umax-1. */
+ __asm__ volatile ("umax x19, x20, #10\n" : :: "x19");
+ /* After umax-1. */
+
+ PREPARE_REGS (a, b, c);
+ /* Before umax-2. */
+ __asm__ volatile ("umax x19, x20, x21\n" : :: "x19");
+ /* After umax-2. */
+
+ PREPARE_REGS (a, b, c);
+ /* Before umin-1. */
+ __asm__ volatile ("umin x19, x20, #10\n" : :: "x19");
+ /* After umin-1. */
+
+ PREPARE_REGS (a, b, c);
+ /* Before umin-2. */
+ __asm__ volatile ("umin x19, x20, x21\n" : :: "x19");
+ /* After umin-2. */
+
+ return 0;
+}
--- /dev/null
+# Copyright 2024-2026 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 instruction record for AArch64 FEAT_CSSC instructions.
+# Based on gdb.reverse/aarch64-mops.exp
+#
+# The basic flow of the record tests are:
+# 1) Stop before executing the instructions of interest. Record
+# the initial value of the registers that the instruction will
+# change, i.e. the destination register.
+# 2) Execute the instructions. Record the new value of the
+# registers that changed.
+# 3) Reverse the direction of the execution and execute back to
+# just before the instructions of interest. Record the final
+# value of the registers of interest.
+# 4) Check that the initial and new values of the registers are
+# different, i.e. the instruction changed the registers as expected.
+# 5) Check that the initial and final values of the registers are
+# the same, i.e. GDB record restored the registers to their
+# original values.
+
+require allow_aarch64_cssc_tests
+standard_testfile
+
+if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} \
+ [list debug additional_flags=-march=armv8-a+cssc]] } {
+ return
+}
+
+if {![runto_main]} {
+ return
+}
+
+gdb_test_no_output "record full"
+
+proc test_single_asm { name } {
+ with_test_prefix $name {
+ set before_seq [gdb_get_line_number "Before ${name}"]
+ set after_seq [gdb_get_line_number "After ${name}"]
+ set regs { x19 x20 x21 }
+
+ set insn [lindex [split $name "-"] 0]
+
+ gdb_test "break $before_seq" \
+ "Breakpoint ${::decimal} at ${::hex}: file .*/aarch64-cssc.c, line ${::decimal}\\." \
+ "$insn: break before instruction sequence"
+ gdb_continue_to_breakpoint "$insn: about to execute instruction sequence" \
+ [multi_line ".*/aarch64-cssc.c:${::decimal}" \
+ "${::decimal}\[ \t\]+__asm__ volatile \\(\"${insn} .*\".*"]
+
+ # Depending on the compiler, the line number information may put GDB a few
+ # instructions before the beginning of the asm statement.
+ arrive_at_instruction $insn
+ # Add a breakpoint that we're sure is at the prologue instruction.
+ gdb_test "break *\$pc" \
+ "Breakpoint ${::decimal} at ${::hex}: file .*/aarch64-cssc.c, line ${::decimal}\\." \
+ "$insn: break at prologue instruction"
+
+ # Record the initial register values.
+ foreach r $regs {
+ set ${r}_initial [capture_command_output "info register $r" ""]
+ }
+
+ gdb_test "break $after_seq" \
+ "Breakpoint ${::decimal} at ${::hex}: file .*/aarch64-cssc.c, line ${::decimal}\\." \
+ "$insn: break after instruction sequence"
+ gdb_continue_to_breakpoint "$insn: executed instruction sequence" \
+ [multi_line ".*/aarch64-cssc.c:${::decimal}" ".*"]
+
+ # Record the new register values.
+ foreach r $regs {
+ set ${r}_new [capture_command_output "info register $r" ""]
+ }
+
+ # Execute in reverse to before the instruction sequence.
+ gdb_test_no_output "set exec-direction reverse"
+
+ gdb_continue_to_breakpoint "reversed execution of instruction sequence" \
+ [multi_line ".*/aarch64-cssc.c:${::decimal}" \
+ "${::decimal}\[ \t\]+__asm__ volatile \\(\"${insn} .*\".*"]
+
+ # Record the final register values.
+ foreach r $regs {
+ set ${r}_final [capture_command_output "info register $r" ""]
+ }
+
+ foreach v { x19 x20 x21 } {
+ gdb_assert ![string compare [set ${v}_initial] [set ${v}_final]] \
+ "$insn: check $v initial value versus $v final value"
+ }
+
+ gdb_assert [string compare [set x19_initial] [set x19_new]] \
+ "$insn: check x19 initial value versus x19 new value"
+
+ foreach v { x20 x21 } {
+ gdb_assert ![string compare [set ${v}_initial] [set ${v}_new]] \
+ "$insn: check $v initial value versus $v new value"
+ }
+
+ # Restore forward execution and go to end of recording.
+ gdb_test_no_output "set exec-direction forward"
+ gdb_test "record goto end" \
+ [multi_line \
+ "Go forward to insn number ${::decimal}" \
+ "#0 main \\(\\) at .*/aarch64-cssc.c:${::decimal}" \
+ ".*"]
+ }
+}
+
+set cases {
+ { abs }
+ { cnt }
+ { ctz }
+ { smax-1 }
+ { smax-2 }
+ { smin-1 }
+ { smin-2 }
+ { umax-1 }
+ { umax-2 }
+ { umin-1 }
+ { umin-2 }
+}
+
+foreach c $cases {
+ lassign $c insn
+ test_single_asm $insn
+}
return $allow_fpmr_tests
}
+# Run a test on the target to see if it supports the AArch64 CSSC feature.
+# Return 1 if so, 0 if it does not. Note this causes a restart of GDB.
+
+gdb_caching_proc allow_aarch64_cssc_tests {} {
+ global srcdir subdir gdb_prompt inferior_exited_re
+
+ set me "allow_aarch64_cssc_tests"
+
+ if { ![is_aarch64_target]} {
+ return 0
+ }
+
+ set compile_flags "{additional_flags=-march=armv8-a+cssc}"
+
+ # Compile a test program reading CSSC.
+ set src {
+ int main() {
+ asm volatile ("abs x0, x1" ::: "x0");
+ return 0;
+ }
+ }
+
+ if {![gdb_simple_compile $me $src executable $compile_flags]} {
+ return 0
+ }
+
+ # Compilation succeeded so now run it via gdb.
+ clean_restart
+ gdb_load $obj
+ gdb_run_cmd
+
+ gdb_expect {
+ -re ".*Illegal instruction.*${gdb_prompt} $" {
+ verbose -log "\n$me cssc support not detected"
+ set allow_cssc_tests 0
+ }
+ -re ".*$inferior_exited_re normally.*${gdb_prompt} $" {
+ verbose -log "\n$me: cssc support detected"
+ set allow_cssc_tests 1
+ }
+ default {
+ warning "\n$me: default case taken"
+ set allow_cssc_tests 0
+ }
+ }
+ gdb_exit
+ remote_file build delete $obj
+
+ verbose "$me: returning $allow_cssc_tests" 2
+ return $allow_cssc_tests
+}
+
# Run a test on the target to see if it supports AArch64 MOPS (Memory
# Operations) extensions. Return 1 if so, 0 if it does not. Note this
# causes a restart of GDB.
projects / thirdparty / binutils-gdb.git / commitdiff
