gdb/testsuite/gdb.base/memops-watchpoint.exp

# 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 standard libc memory operation functions.  They are
# frequently optimized with specialized instructions, so make sure GDB behaves
# correctly in their presence.

standard_testfile
set options "-fno-builtin-memset -fno-builtin-memcpy -fno-builtin-memmove"
if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} \
	  [list debug additional_flags=$options]] } {
    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"

# For the tests below, split the pattern matching in two parts: one for the
# watchpoint trigger, and another for the line showing the function name.
# This is to allow the tests to work if there's a properly named symbol for
# the function, even if there's no libc debug info.

set saw_watch_trigger 0
set saw_function 0
set is_supported 1
set message "continue until memset watchpoint hits"
set watch_trigger \
	[multi_line \
	     "Continuing\\." \
	     "" \
	     "(Hardware w|W)atchpoint ${decimal}: -location a\\\[28\\\]" \
	     "" \
	     "Old value = 104 'h'" \
	     "New value = 0 '\\\\000'"]
gdb_test_multiple "continue" $message {
    -re $watch_trigger {
	set saw_watch_trigger 1
	exp_continue
    }
    -re ".*memset.* \\(\\) at .*:$decimal\r\n" {
	set saw_function 1
	exp_continue
    }
    -re ".*memset.* \\(\\) from .*libc\[^\r\n\]+\r\n" {
	set saw_function 1
	exp_continue
    }
    -re "in \\?\\? \\(\\) from .*libc\[^\r\n\]+\r\n" {
	set is_supported 0
	unsupported "symbol for memset not found"
	exp_continue
    }
    -re "$gdb_prompt $" {
	if { $is_supported } {
	    setup_kfail breakpoints/31665 arm*-*-linux*
	    gdb_assert { $saw_watch_trigger && $saw_function } $message
	}
    }
}

# Note: Some architectures use memmove for memcpy.
set saw_watch_trigger 0
set saw_function 0
set is_supported 1
set message "continue until memcpy watchpoint hits"
set watch_trigger \
	[multi_line \
	     "Continuing\\." \
	     "" \
	     "(Hardware w|W)atchpoint ${decimal}: -location b\\\[28\\\]" \
	     "" \
	     "Old value = 101 'e'" \
	     "New value = 114 'r'"]
gdb_test_multiple "continue" $message {
    -re $watch_trigger {
	set saw_watch_trigger 1
	exp_continue
    }
    -re ".*(memcpy|memmove).* \\(\\) at .*:$decimal\r\n" {
	set saw_function 1
	exp_continue
    }
    -re ".*(memcpy|memmove).* \\(\\) from .*libc\[^\r\n\]+\r\n" {
	set saw_function 1
	exp_continue
    }
    -re "in \\?\\? \\(\\) from .*libc\[^\r\n\]+\r\n" {
	set is_supported 0
	unsupported "symbol for memcpy not found"
	exp_continue
    }
    -re "$gdb_prompt $" {
	if { $is_supported } {
	    setup_kfail breakpoints/31665 arm*-*-linux*
	    gdb_assert { $saw_watch_trigger && $saw_function } $message
	}
    }
}

# Note: Some architectures use memcpy for memmove.
set saw_watch_trigger 0
set saw_function 0
set is_supported 1
set message "continue until memmove watchpoint hits"
set watch_trigger \
	[multi_line \
	     "Continuing\\." \
	     "" \
	     "(Hardware w|W)atchpoint ${decimal}: -location c\\\[28\\\]" \
	     "" \
	     "Old value = 100 'd'" \
	     "New value = 114 'r'"]
gdb_test_multiple "continue" $message {
    -re $watch_trigger {
	set saw_watch_trigger 1
	exp_continue
    }
    -re ".*(memcpy|memmove).* \\(\\) at .*:$decimal\r\n" {
	set saw_function 1
	exp_continue
    }
    -re ".*(memcpy|memmove).* \\(\\) from .*libc\[^\r\n\]+\r\n" {
	set saw_function 1
	exp_continue
    }
    -re "in \\?\\? \\(\\) from .*libc\[^\r\n\]+\r\n" {
	set is_supported 0
	unsupported "symbol for memmove not found"
	exp_continue
    }
    -re "$gdb_prompt $" {
	if { $is_supported } {
	    setup_kfail breakpoints/31665 arm*-*-linux*
	    gdb_assert { $saw_watch_trigger && $saw_function } $message
	}
    }
}