gdb/testsuite/gdb.base/break-always.exp

#   Copyright 2008-2021 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 that 'set breakpoint always-inserted 1' is not a brick
# Also verifies that breakpoint enabling/disabling works properly
# with duplicated breakpoints.

if { [prepare_for_testing "failed to prepare" break-always break-always.c] } {
    return -1
}

set bar_location [gdb_get_line_number "break in bar" break-always.c]

gdb_test_no_output "set breakpoint always-inserted on"

gdb_test "show breakpoint always-inserted" "mode is on\." \
    "confirm breakpoint always-inserted"

runto foo

gdb_test "break bar" "Breakpoint 2.*" "set breakpoint on bar"
gdb_test "break bar" "Note: breakpoint 2 also set.*Breakpoint 3.*" "set 2nd breakpoint on bar"
gdb_test "break bar" "Note: breakpoints 2 and 3 also set.*Breakpoint 4.*" "set 3rd breakpoint on bar"
gdb_test "break bar" "Note: breakpoints 2, 3 and 4 also set.*Breakpoint 5.*" "set 4th breakpoint on bar"
gdb_test "info breakpoints" "keep y.*keep y.*keep y.*keep y.*keep y.*" "initial check breakpoint state"
gdb_test_no_output "disable" "initial disable all breakpoints"
gdb_test_no_output "enable" "initial enable all breakpoints"
gdb_test_no_output "disable" "re-disable all breakpoints"
gdb_test_no_output "enable 3" "enable 3.A"
gdb_test_no_output "disable 3" "disable 3.B"
gdb_test_no_output "enable 3" "enable 3.C"
gdb_test_no_output "enable 2" "enable 2.D"
gdb_test_no_output "disable 2" "disable 2.E"
gdb_test_no_output "disable 3" "disable 3.F"
gdb_test_no_output "enable 3" "enable 3.G"
gdb_test_no_output "enable 2" "enable 2.H"
gdb_test_no_output "disable 2" "disable 2.I"
gdb_test "info breakpoints" "keep n.*keep n.*keep y.*keep n.*keep n.*" "before re-enable check breakpoint state"
gdb_test_no_output "enable" "re-enable all breakpoints"

set bp_address 0
set test "set breakpoint on bar 2"
gdb_test_multiple "break bar" $test {
    -re "Breakpoint 6 at ($hex).*$gdb_prompt $" {
	set bp_address $expect_out(1,string)
	pass $test
    }
}

# Save the original INSN under the breakpoint.
gdb_test "p /x \$shadow = *(char *) $bp_address" \
    " = $hex" \
    "save shadow"

# Overwrite memory where the breakpoint is planted.  GDB should update
# its memory breakpoint's shadows, to account for the new contents,
# and still leave the breakpoint insn planted.  Try twice with
# different values, in case we happen to be writting exactly what was
# there already.
foreach test_value {0 1} {
    set write_test "write $test_value to breakpoint's address"

    gdb_test_multiple "p /x *(char *) $bp_address = $test_value" $write_test {
	-re "Cannot access memory at address $hex.*$gdb_prompt $" {

	    # Some targets do not allow manually writing a breakpoint to a
	    # certain memory address, like QEMU.  In that case, just bail out.
	    unsupported "cannot write to address $bp_address"
	    return -1
	}
	-re " = .*$gdb_prompt $" {
	    pass $write_test
	}
    }

    set read_test "read back $test_value from the breakpoint's address"
    gdb_test "p /x *(char *) $bp_address" " = 0x$test_value" $read_test
}

# Restore the original contents.
gdb_test "p /x *(char *) $bp_address = \$shadow" "" \
    "restore the original contents"

# Run to breakpoint.
gdb_continue_to_breakpoint "bar" ".*break-always.c:$bar_location.*"