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# Copyright 2013-2021 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/>.
load_lib "range-stepping-support.exp"
standard_testfile
set executable $testfile
if { [prepare_for_testing "failed to prepare" $testfile $srcfile {debug}] } {
return -1
}
if ![runto_main] {
fail "can't run to main"
return -1
}
if ![gdb_range_stepping_enabled] {
unsupported "range stepping not supported by the target"
return -1
}
# Check that range stepping can step a range of multiple instructions.
with_test_prefix "multi insns" {
gdb_breakpoint [gdb_get_line_number "location 1"]
gdb_continue_to_breakpoint "location 1"
set pc_before_stepping ""
set test "pc before stepping"
gdb_test_multiple "print/x \$pc" $test {
-re "\\\$$decimal = (\[^\r\n\]*)\r\n$gdb_prompt $" {
set pc_before_stepping $expect_out(1,string)
pass $test
}
}
# When "next" is executed, GDB should send one vCont;s and vCont;r
# and receive two stop replies:
#
# --> vCont;s (step over breakpoint)
# <-- T05
# --> vCont;rSTART,END (range step)
# <-- T05
set result [exec_cmd_expect_vCont_count "next" 1]
if { $result } {
# This is the first range-stepping test, and the simplest
# one. If it fails, probably the rest of the tests would
# fail too, and the huge number of rsp packets in the test
# with the time-consuming loop would blow up the gdb.log file.
# Skip the rest of the tests.
return
}
set pc_after_stepping ""
set msg "pc after stepping"
gdb_test_multiple "print/x \$pc" $msg {
-re "\\\$$decimal = (\[^\r\n\]*)\r\n$gdb_prompt $" {
set pc_after_stepping $expect_out(1,string)
pass $msg
}
}
# There should be at least two instructions between
# PC_BEFORE_STEPPING and PC_AFTER_STEPPING.
gdb_test "disassemble ${pc_before_stepping},${pc_after_stepping}" \
"${hex} <main\\+${decimal}>:.*${hex} <main\\+${decimal}>:.*" \
"stepped multiple insns"
}
# Check that range stepping can step over a function.
with_test_prefix "step over func" {
set line_num [gdb_get_line_number "location 2"]
gdb_test "where" "main \\(\\) at .*${srcfile}:${line_num}.*"
# It's expected to get three stops and two 'vCont;r's. In the C
# code, the line of C source produces roughly the following
# instructions:
#
# addr1:
# insn1
# insn2
# ...
# call func1
# addr2:
# ...
# insn3
# addr3:
# insn4
#
# Something like this will happen:
# --> vCont;rADDR1,ADDR3 (range step from ADDR1 to ADDR3)
# <-- T05 (target single-stepped to func, which is out of the step range)
# --> $Z0,ADDR2 (place step-resume breakpoint at ADDR2)
# --> vCont;c (resume)
# <-- T05 (target stops at ADDR2)
# --> vCont;rADDR1,ADDR3 (continues range stepping)
# <-- T05
exec_cmd_expect_vCont_count "next" 2
}
# Check that breakpoints interrupt range stepping correctly.
with_test_prefix "breakpoint" {
gdb_breakpoint "func1"
# Something like this will happen:
# --> vCont;rADDR1,ADDR3
# <-- T05 (target single-steps to func1, which is out of the step range)
# --> $Z0,ADDR2 (step-resume breakpoint at ADDR2)
# --> vCont;c (resume)
# <-- T05 (target hits the breakpoint at func1)
exec_cmd_expect_vCont_count "next" 1
gdb_test "backtrace" "#0 .* func1 .*#1 .* main .*" \
"backtrace from func1"
# A cancelled range step should not confuse the following
# execution commands.
exec_cmd_expect_vCont_count "stepi" 0
gdb_test "finish" ".*"
gdb_test "next" ".*"
delete_breakpoints
}
# Check that range stepping works well even when there's a loop in the
# step range.
with_test_prefix "loop" {
# GDB should send one vCont;r and receive one stop reply:
# --> vCont;rSTART,END (range step)
# <-- T05
exec_cmd_expect_vCont_count "next" 1
# Confirm the loop completed.
gdb_test "print a" " = 15"
gdb_test "print e" " = 105"
}
# Check that range stepping works well even when the target's PC was
# already within the loop's body.
with_test_prefix "loop 2" {
# Stepi into the loop body. 15 should be large enough to make
# sure the program stops within the loop's body.
gdb_test "stepi 15" ".*"
# GDB should send one vCont;r and receive one stop reply:
# --> vCont;rSTART,END (range step)
# <-- T05
exec_cmd_expect_vCont_count "next" 1
# Confirm the loop completed.
gdb_test "print a" " = 15"
gdb_test "print e" " = 105"
}
# Check that range stepping works well even when it is interrupted by
# ctrl-c.
if ![target_info exists gdb,nointerrupts] {
with_test_prefix "interrupt" {
gdb_test_no_output "set debug remote 1"
send_gdb "next\n"
sleep 1
send_gdb "\003"
# GDB should send one vCont;r and receive one stop reply for
# SIGINT:
# --> vCont;rSTART,END (range step)
# <-- T02 (SIGINT)
set vcont_r_counter 0
set test "send ctrl-c to GDB"
gdb_test_multiple "" $test {
-re "vCont;r\[^\r\n\]*\.\.\." {
incr vcont_r_counter
exp_continue
}
-re "Program received signal SIGINT.*$gdb_prompt $" {
pass $test
}
}
gdb_test_no_output "set debug remote 0"
# Check the number of 'vCont;r' packets.
if { $vcont_r_counter == 1 } {
pass "${test}: 1 vCont;r"
} else {
fail "${test}: 1 vCont;r"
}
# Break the loop earlier and continue range stepping.
gdb_test "set variable c = 0"
exec_cmd_expect_vCont_count "next" 1
}
}
# Check that range stepping doesn't break software watchpoints. With
# those, GDB needs to be notified of all single-steps, to evaluate
# whether the watched value changes at each step.
with_test_prefix "software watchpoint" {
gdb_test "step" "soft-watch.*" "step into multiple instruction line"
# A software watchpoint at PC makes the thread stop before the
# whole line range is over (after one single-step, actually).
gdb_test "watch \$pc" ".*" "set watchpoint"
gdb_test "step" "soft-watch.*" "step still in same line"
}
return 0
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