mirror of
https://sourceware.org/git/binutils-gdb.git
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227 lines
6.5 KiB
Plaintext
227 lines
6.5 KiB
Plaintext
# Copyright 2013-2018 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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load_lib "range-stepping-support.exp"
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standard_testfile
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set executable $testfile
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if { [prepare_for_testing "failed to prepare" $testfile $srcfile {debug}] } {
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return -1
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}
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if ![runto_main] {
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fail "can't run to main"
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return -1
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}
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if ![gdb_range_stepping_enabled] {
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unsupported "range stepping not supported by the target"
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return -1
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}
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# Check that range stepping can step a range of multiple instructions.
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with_test_prefix "multi insns" {
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gdb_breakpoint [gdb_get_line_number "location 1"]
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gdb_continue_to_breakpoint "location 1"
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set pc_before_stepping ""
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set test "pc before stepping"
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gdb_test_multiple "print/x \$pc" $test {
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-re "\\\$$decimal = (\[^\r\n\]*)\r\n$gdb_prompt $" {
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set pc_before_stepping $expect_out(1,string)
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pass $test
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}
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}
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# When "next" is executed, GDB should send one vCont;s and vCont;r
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# and receive two stop replies:
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#
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# --> vCont;s (step over breakpoint)
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# <-- T05
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# --> vCont;rSTART,END (range step)
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# <-- T05
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set result [exec_cmd_expect_vCont_count "next" 1]
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if { $result } {
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# This is the first range-stepping test, and the simplest
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# one. If it fails, probably the rest of the tests would
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# fail too, and the huge number of rsp packets in the test
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# with the time-consuming loop would blow up the gdb.log file.
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# Skip the rest of the tests.
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return
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}
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set pc_after_stepping ""
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set msg "pc after stepping"
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gdb_test_multiple "print/x \$pc" $msg {
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-re "\\\$$decimal = (\[^\r\n\]*)\r\n$gdb_prompt $" {
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set pc_after_stepping $expect_out(1,string)
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pass $msg
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}
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}
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# There should be at least two instructions between
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# PC_BEFORE_STEPPING and PC_AFTER_STEPPING.
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gdb_test "disassemble ${pc_before_stepping},${pc_after_stepping}" \
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"${hex} <main\\+${decimal}>:.*${hex} <main\\+${decimal}>:.*" \
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"stepped multiple insns"
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}
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# Check that range stepping can step over a function.
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with_test_prefix "step over func" {
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set line_num [gdb_get_line_number "location 2"]
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gdb_test "where" "main \\(\\) at .*${srcfile}:${line_num}.*"
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# It's expected to get three stops and two 'vCont;r's. In the C
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# code, the line of C source produces roughly the following
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# instructions:
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#
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# addr1:
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# insn1
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# insn2
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# ...
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# call func1
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# addr2:
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# ...
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# insn3
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# addr3:
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# insn4
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#
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# Something like this will happen:
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# --> vCont;rADDR1,ADDR3 (range step from ADDR1 to ADDR3)
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# <-- T05 (target single-stepped to func, which is out of the step range)
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# --> $Z0,ADDR2 (place step-resume breakpoint at ADDR2)
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# --> vCont;c (resume)
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# <-- T05 (target stops at ADDR2)
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# --> vCont;rADDR1,ADDR3 (continues range stepping)
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# <-- T05
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exec_cmd_expect_vCont_count "next" 2
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}
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# Check that breakpoints interrupt range stepping correctly.
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with_test_prefix "breakpoint" {
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gdb_breakpoint "func1"
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# Something like this will happen:
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# --> vCont;rADDR1,ADDR3
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# <-- T05 (target single-steps to func1, which is out of the step range)
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# --> $Z0,ADDR2 (step-resume breakpoint at ADDR2)
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# --> vCont;c (resume)
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# <-- T05 (target hits the breakpoint at func1)
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exec_cmd_expect_vCont_count "next" 1
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gdb_test "backtrace" "#0 .* func1 .*#1 .* main .*" \
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"backtrace from func1"
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# A cancelled range step should not confuse the following
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# execution commands.
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exec_cmd_expect_vCont_count "stepi" 0
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gdb_test "finish" ".*"
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gdb_test "next" ".*"
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delete_breakpoints
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}
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# Check that range stepping works well even when there's a loop in the
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# step range.
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with_test_prefix "loop" {
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# GDB should send one vCont;r and receive one stop reply:
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# --> vCont;rSTART,END (range step)
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# <-- T05
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exec_cmd_expect_vCont_count "next" 1
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# Confirm the loop completed.
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gdb_test "print a" " = 15"
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gdb_test "print e" " = 105"
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}
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# Check that range stepping works well even when the target's PC was
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# already within the loop's body.
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with_test_prefix "loop 2" {
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# Stepi into the loop body. 15 should be large enough to make
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# sure the program stops within the loop's body.
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gdb_test "stepi 15" ".*"
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# GDB should send one vCont;r and receive one stop reply:
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# --> vCont;rSTART,END (range step)
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# <-- T05
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exec_cmd_expect_vCont_count "next" 1
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# Confirm the loop completed.
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gdb_test "print a" " = 15"
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gdb_test "print e" " = 105"
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}
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# Check that range stepping works well even when it is interrupted by
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# ctrl-c.
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if ![target_info exists gdb,nointerrupts] {
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with_test_prefix "interrupt" {
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gdb_test_no_output "set debug remote 1"
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send_gdb "next\n"
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sleep 1
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send_gdb "\003"
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# GDB should send one vCont;r and receive one stop reply for
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# SIGINT:
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# --> vCont;rSTART,END (range step)
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# <-- T02 (SIGINT)
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set vcont_r_counter 0
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set test "send ctrl-c to GDB"
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gdb_test_multiple "" $test {
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-re "vCont;r\[^\r\n\]*\.\.\." {
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incr vcont_r_counter
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exp_continue
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}
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-re "Program received signal SIGINT.*$gdb_prompt $" {
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pass $test
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}
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}
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gdb_test_no_output "set debug remote 0"
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# Check the number of 'vCont;r' packets.
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if { $vcont_r_counter == 1 } {
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pass "${test}: 1 vCont;r"
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} else {
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fail "${test}: 1 vCont;r"
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}
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# Break the loop earlier and continue range stepping.
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gdb_test "set variable c = 0"
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exec_cmd_expect_vCont_count "next" 1
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}
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}
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# Check that range stepping doesn't break software watchpoints. With
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# those, GDB needs to be notified of all single-steps, to evaluate
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# whether the watched value changes at each step.
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with_test_prefix "software watchpoint" {
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gdb_test "step" "soft-watch.*" "step into multiple instruction line"
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# A software watchpoint at PC makes the thread stop before the
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# whole line range is over (after one single-step, actually).
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gdb_test "watch \$pc" ".*" "set watchpoint"
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gdb_test "step" "soft-watch.*" "step still in same line"
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}
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return 0
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