80f0110c98
Nowadays, in the range-stepping tests, we check not only the number of vCont;r packets but also the number of vCont;s packets, because we think the remote target which can do range stepping must support single step. However, if we turn displaced stepping on, the remote target (GDBserver) can do range stepping, and support single step, but GDB may decide to resume instructions in the scratchpad rather than single step them one by one for displaced stepping. For example, when aarch64 GDB debugs arm linux program with aarch64 GDBserver, GDBserver supports both range stepping and single step, but GDB (with the gdbarch for arm-linux) decides resume instructions in the scratchpad, so in the RSP traffic, there is no vCont;s packet at all, and some range-stepping.exp tests fail, FAIL: gdb.base/range-stepping.exp: multi insns: next: vCont;s=1 vCont;r=1 This patch is to get rid of the checking to the number of vCont;s in exec_cmd_expect_vCont_count. gdb/testsuite: 2015-10-21 Yao Qi <yao.qi@linaro.org> * lib/range-stepping-support.exp (exec_cmd_expect_vCont_count): Remove argument exp_vCont_s. * gdb.base/range-stepping.exp: Callers updated. * gdb.trace/range-stepping.exp: Likewise.
224 lines
6.5 KiB
Text
224 lines
6.5 KiB
Text
# Copyright 2013-2015 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 $testfile.exp $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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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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# 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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