| 1 | # Copyright 2013-2017 Free Software Foundation, Inc. |
| 2 | |
| 3 | # This program is free software; you can redistribute it and/or modify |
| 4 | # it under the terms of the GNU General Public License as published by |
| 5 | # the Free Software Foundation; either version 3 of the License, or |
| 6 | # (at your option) any later version. |
| 7 | # |
| 8 | # This program is distributed in the hope that it will be useful, |
| 9 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | # GNU General Public License for more details. |
| 12 | # |
| 13 | # You should have received a copy of the GNU General Public License |
| 14 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 15 | |
| 16 | load_lib "range-stepping-support.exp" |
| 17 | |
| 18 | standard_testfile |
| 19 | set executable $testfile |
| 20 | |
| 21 | if { [prepare_for_testing "failed to prepare" $testfile $srcfile {debug}] } { |
| 22 | return -1 |
| 23 | } |
| 24 | |
| 25 | if ![runto_main] { |
| 26 | fail "can't run to main" |
| 27 | return -1 |
| 28 | } |
| 29 | |
| 30 | if ![gdb_range_stepping_enabled] { |
| 31 | unsupported "range stepping not supported by the target" |
| 32 | return -1 |
| 33 | } |
| 34 | |
| 35 | # Check that range stepping can step a range of multiple instructions. |
| 36 | |
| 37 | with_test_prefix "multi insns" { |
| 38 | |
| 39 | gdb_breakpoint [gdb_get_line_number "location 1"] |
| 40 | gdb_continue_to_breakpoint "location 1" |
| 41 | |
| 42 | set pc_before_stepping "" |
| 43 | set test "pc before stepping" |
| 44 | gdb_test_multiple "print/x \$pc" $test { |
| 45 | -re "\\\$$decimal = (\[^\r\n\]*)\r\n$gdb_prompt $" { |
| 46 | set pc_before_stepping $expect_out(1,string) |
| 47 | pass $test |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | # When "next" is executed, GDB should send one vCont;s and vCont;r |
| 52 | # and receive two stop replies: |
| 53 | # |
| 54 | # --> vCont;s (step over breakpoint) |
| 55 | # <-- T05 |
| 56 | # --> vCont;rSTART,END (range step) |
| 57 | # <-- T05 |
| 58 | set result [exec_cmd_expect_vCont_count "next" 1] |
| 59 | if { $result } { |
| 60 | # This is the first range-stepping test, and the simplest |
| 61 | # one. If it fails, probably the rest of the tests would |
| 62 | # fail too, and the huge number of rsp packets in the test |
| 63 | # with the time-consuming loop would blow up the gdb.log file. |
| 64 | # Skip the rest of the tests. |
| 65 | return |
| 66 | } |
| 67 | |
| 68 | set pc_after_stepping "" |
| 69 | set msg "pc after stepping" |
| 70 | gdb_test_multiple "print/x \$pc" $msg { |
| 71 | -re "\\\$$decimal = (\[^\r\n\]*)\r\n$gdb_prompt $" { |
| 72 | set pc_after_stepping $expect_out(1,string) |
| 73 | pass $msg |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | # There should be at least two instructions between |
| 78 | # PC_BEFORE_STEPPING and PC_AFTER_STEPPING. |
| 79 | gdb_test "disassemble ${pc_before_stepping},${pc_after_stepping}" \ |
| 80 | "${hex} <main\\+${decimal}>:.*${hex} <main\\+${decimal}>:.*" \ |
| 81 | "stepped multiple insns" |
| 82 | } |
| 83 | |
| 84 | # Check that range stepping can step over a function. |
| 85 | |
| 86 | with_test_prefix "step over func" { |
| 87 | |
| 88 | set line_num [gdb_get_line_number "location 2"] |
| 89 | gdb_test "where" "main \\(\\) at .*${srcfile}:${line_num}.*" |
| 90 | |
| 91 | # It's expected to get three stops and two 'vCont;r's. In the C |
| 92 | # code, the line of C source produces roughly the following |
| 93 | # instructions: |
| 94 | # |
| 95 | # addr1: |
| 96 | # insn1 |
| 97 | # insn2 |
| 98 | # ... |
| 99 | # call func1 |
| 100 | # addr2: |
| 101 | # ... |
| 102 | # insn3 |
| 103 | # addr3: |
| 104 | # insn4 |
| 105 | # |
| 106 | # Something like this will happen: |
| 107 | # --> vCont;rADDR1,ADDR3 (range step from ADDR1 to ADDR3) |
| 108 | # <-- T05 (target single-stepped to func, which is out of the step range) |
| 109 | # --> $Z0,ADDR2 (place step-resume breakpoint at ADDR2) |
| 110 | # --> vCont;c (resume) |
| 111 | # <-- T05 (target stops at ADDR2) |
| 112 | # --> vCont;rADDR1,ADDR3 (continues range stepping) |
| 113 | # <-- T05 |
| 114 | exec_cmd_expect_vCont_count "next" 2 |
| 115 | } |
| 116 | |
| 117 | # Check that breakpoints interrupt range stepping correctly. |
| 118 | |
| 119 | with_test_prefix "breakpoint" { |
| 120 | gdb_breakpoint "func1" |
| 121 | # Something like this will happen: |
| 122 | # --> vCont;rADDR1,ADDR3 |
| 123 | # <-- T05 (target single-steps to func1, which is out of the step range) |
| 124 | # --> $Z0,ADDR2 (step-resume breakpoint at ADDR2) |
| 125 | # --> vCont;c (resume) |
| 126 | # <-- T05 (target hits the breakpoint at func1) |
| 127 | exec_cmd_expect_vCont_count "next" 1 |
| 128 | |
| 129 | gdb_test "backtrace" "#0 .* func1 .*#1 .* main .*" \ |
| 130 | "backtrace from func1" |
| 131 | |
| 132 | # A cancelled range step should not confuse the following |
| 133 | # execution commands. |
| 134 | exec_cmd_expect_vCont_count "stepi" 0 |
| 135 | gdb_test "finish" ".*" |
| 136 | gdb_test "next" ".*" |
| 137 | delete_breakpoints |
| 138 | } |
| 139 | |
| 140 | # Check that range stepping works well even when there's a loop in the |
| 141 | # step range. |
| 142 | |
| 143 | with_test_prefix "loop" { |
| 144 | |
| 145 | # GDB should send one vCont;r and receive one stop reply: |
| 146 | # --> vCont;rSTART,END (range step) |
| 147 | # <-- T05 |
| 148 | exec_cmd_expect_vCont_count "next" 1 |
| 149 | |
| 150 | # Confirm the loop completed. |
| 151 | gdb_test "print a" " = 15" |
| 152 | gdb_test "print e" " = 105" |
| 153 | } |
| 154 | |
| 155 | # Check that range stepping works well even when the target's PC was |
| 156 | # already within the loop's body. |
| 157 | |
| 158 | with_test_prefix "loop 2" { |
| 159 | # Stepi into the loop body. 15 should be large enough to make |
| 160 | # sure the program stops within the loop's body. |
| 161 | gdb_test "stepi 15" ".*" |
| 162 | # GDB should send one vCont;r and receive one stop reply: |
| 163 | # --> vCont;rSTART,END (range step) |
| 164 | # <-- T05 |
| 165 | exec_cmd_expect_vCont_count "next" 1 |
| 166 | |
| 167 | # Confirm the loop completed. |
| 168 | gdb_test "print a" " = 15" |
| 169 | gdb_test "print e" " = 105" |
| 170 | } |
| 171 | |
| 172 | # Check that range stepping works well even when it is interrupted by |
| 173 | # ctrl-c. |
| 174 | |
| 175 | if ![target_info exists gdb,nointerrupts] { |
| 176 | with_test_prefix "interrupt" { |
| 177 | gdb_test_no_output "set debug remote 1" |
| 178 | |
| 179 | send_gdb "next\n" |
| 180 | sleep 1 |
| 181 | send_gdb "\003" |
| 182 | |
| 183 | # GDB should send one vCont;r and receive one stop reply for |
| 184 | # SIGINT: |
| 185 | # --> vCont;rSTART,END (range step) |
| 186 | # <-- T02 (SIGINT) |
| 187 | |
| 188 | set vcont_r_counter 0 |
| 189 | |
| 190 | set test "send ctrl-c to GDB" |
| 191 | gdb_test_multiple "" $test { |
| 192 | -re "vCont;r\[^\r\n\]*\.\.\." { |
| 193 | incr vcont_r_counter |
| 194 | exp_continue |
| 195 | } |
| 196 | -re "Program received signal SIGINT.*$gdb_prompt $" { |
| 197 | pass $test |
| 198 | } |
| 199 | } |
| 200 | gdb_test_no_output "set debug remote 0" |
| 201 | |
| 202 | # Check the number of 'vCont;r' packets. |
| 203 | if { $vcont_r_counter == 1 } { |
| 204 | pass "${test}: 1 vCont;r" |
| 205 | } else { |
| 206 | fail "${test}: 1 vCont;r" |
| 207 | } |
| 208 | |
| 209 | # Break the loop earlier and continue range stepping. |
| 210 | gdb_test "set variable c = 0" |
| 211 | exec_cmd_expect_vCont_count "next" 1 |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | # Check that range stepping doesn't break software watchpoints. With |
| 216 | # those, GDB needs to be notified of all single-steps, to evaluate |
| 217 | # whether the watched value changes at each step. |
| 218 | with_test_prefix "software watchpoint" { |
| 219 | gdb_test "step" "soft-watch.*" "step into multiple instruction line" |
| 220 | # A software watchpoint at PC makes the thread stop before the |
| 221 | # whole line range is over (after one single-step, actually). |
| 222 | gdb_test "watch \$pc" ".*" "set watchpoint" |
| 223 | gdb_test "step" "soft-watch.*" "step still in same line" |
| 224 | } |
| 225 | |
| 226 | return 0 |