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# Copyright (C) 2015-2023 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/>.
if ![supports_reverse] {
return
}
# Check if start command is supported.
require use_gdb_stub 0
standard_testfile
if {[prepare_for_testing "failed to prepare" $testfile $srcfile \
[list debug]]} {
return -1
}
if {![runto_main]} {
return
}
# Read function name from testcases[N].
proc read_testcase { n } {
global gdb_prompt
set result -1
gdb_test_multiple "print testcases\[${n}\]" "read name of test case ${n}" {
-re "\[$\].*= .*<(.*)>.*$gdb_prompt $" {
set result $expect_out(1,string)
}
-re "$gdb_prompt $" { }
}
return $result
}
# In each function FUNC, GDB turns on process record, and single step
# until program goes to the end of the function. Then, single step
# backward. In each of forward single step and backward single step,
# the contents of registers are saved, and test compares them. If
# there is any differences, a FAIL is emitted.
proc test { func testcase_nr } {
global hex decimal
global gdb_prompt
with_test_prefix "$func" {
gdb_start_cmd $testcase_nr
gdb_test "" "" "wait for prompt"
gdb_breakpoint $func
gdb_test "continue"
set last_insn ""
set test "disassemble $func"
gdb_test_multiple $test $test {
-re ".*($hex) <\\+$decimal>:\[^\r\n\]+\r\nEnd of assembler dump\.\r\n$gdb_prompt $" {
set last_insn $expect_out(1,string)
}
}
if { $last_insn == "" } {
fail "find the last instruction of function $func"
}
# Activate process record/replay
gdb_test_no_output "record" "turn on process record"
# Registers contents before each forward single step.
set count 0
set insn_addr ""
for {} {$count < 500} {incr count} {
set prev_insn_addr $insn_addr
set insn_addr ""
gdb_test_multiple "x/i \$pc" "" {
-re ".* ($hex) <.*>:\[ \t\]*(.*)\r\n$gdb_prompt $" {
set insn_addr $expect_out(1,string)
set insn_array($count) $expect_out(2,string)
}
}
if { $insn_addr == "" } {
break
}
if { $last_insn == $insn_addr } {
break
}
if { $prev_insn_addr == $insn_addr } {
# Failed to make progress, might have run into SIGILL.
unsupported "no progress at: $expect_out(2,string)"
break
}
set pre_regs($count) [capture_command_output "info all-registers" ""]
gdb_test -nopass "si"
}
# Registers contents after each backward single step.
for {set i [expr $count - 1]} {$i >= 0} {incr i -1} {
gdb_test -nopass "reverse-stepi"
set post_regs($i) [capture_command_output "info all-registers" ""]
}
# Compare the register contents.
for {set i 0} {$i < $count} {incr i} {
if { ![gdb_assert { [string compare $pre_regs($i) $post_regs($i)] == 0 } \
"compare registers on insn $i:$insn_array($i)"] } {
foreach pre_line [split $pre_regs($i) \n] post_line [split $post_regs($i) \n] {
if { [string compare $pre_line $post_line] } {
verbose -log " -:$pre_line"
verbose -log " +:$post_line"
}
}
}
}
gdb_test "record stop"
}
}
set n_testcases [get_integer_valueof "n_testcases" 0]
if { ${n_testcases} == 0 } {
untested "no test"
return 1
}
for { set i 0 } { ${i} < ${n_testcases} } { incr i } {
set testcase [read_testcase $i]
test $testcase $i
}
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