1# Copyright (C) 2014-2020 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# In this test we're looking at how gdb handles backtraces and 17# investigating the stack depth when confronted with an "invalid" stack, 18# that is a stack where the first few frames are normal, and then there's a 19# frame where the stack in unreadable. 20# 21# One interesting bug that has been observed is that gdb will sometime 22# exhibit different behaviour the first time a stack command is run 23# compared to the second (and later) times a command is run. This is 24# because the first time a command is run gdb actually tries to figure out 25# the answer, while the second (and later) times gdb relies on the answer 26# cached from the first time. As a result in this test each command is 27# run twice, and we restart gdb before testing each different command to 28# ensure that nothing is being cached. 29 30standard_testfile .S 31 32if { ![istarget x86_64-*-* ] || ![is_lp64_target] } { 33 verbose "Skipping ${testfile}." 34 return 35} 36 37if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} {nopie}] } { 38 return -1 39} 40 41if ![runto breakpt] { 42 return -1 43} 44 45gdb_test "bt" "^bt\r\n#0 +breakpt *\\(\\) \[^\r\n\]*\r\n#1 +0x\[0-9a-f\]+ in func5\[^\r\n\]*\r\n#2 +0x\[0-9a-f\]+ in func4\[^\r\n\]*\r\n#3 +0x\[0-9a-f\]+ in func3\[^\r\n\]*\r\nBacktrace stopped: Cannot access memory at address 0x\[0-9a-f\]+" \ 46 "first backtrace, with error message" 47 48gdb_test "bt" "^bt\r\n#0 +breakpt *\\(\\) \[^\r\n\]*\r\n#1 +0x\[0-9a-f\]+ in func5\[^\r\n\]*\r\n#2 +0x\[0-9a-f\]+ in func4\[^\r\n\]*\r\n#3 +0x\[0-9a-f\]+ in func3\[^\r\n\]*\r\nBacktrace stopped: Cannot access memory at address 0x\[0-9a-f\]+" \ 49 "second backtrace, with error message" 50 51clean_restart ${binfile} 52 53if ![runto breakpt] { 54 return -1 55} 56 57gdb_test "interpreter-exec mi \"-stack-info-depth\"" \ 58 "\\^done,depth=\"4\"" \ 59 "check mi -stack-info-depth command, first time" 60 61gdb_test "interpreter-exec mi \"-stack-info-depth\"" \ 62 "\\^done,depth=\"4\"" \ 63 "check mi -stack-info-depth command, second time" 64 65clean_restart ${binfile} 66 67if ![runto breakpt] { 68 return -1 69} 70 71gdb_test "interpreter-exec mi \"-stack-list-frames\"" \ 72 "\\^done,stack=\\\[frame=\{level=\"0\",addr=\"$hex\",func=\"breakpt\",file=\"\[^\"\]+\",fullname=\"\[^\"\]+\",line=\"${decimal}\"(,arch=\"\[^\"\]+\")?\},frame=\{level=\"1\",addr=\"$hex\",func=\"func5\",file=\"\[^\"\]+\",fullname=\"\[^\"\]+\",line=\"${decimal}\"(,arch=\"\[^\"\]+\")?\},frame=\{level=\"2\",addr=\"$hex\",func=\"func4\",file=\"\[^\"\]+\",fullname=\"\[^\"\]+\",line=\"${decimal}\"(,arch=\"\[^\"\]+\")?\},frame=\{level=\"3\",addr=\"$hex\",func=\"func3\",file=\"\[^\"\]+\",fullname=\"\[^\"\]+\",line=\"${decimal}\"(,arch=\"\[^\"\]+\")?\}\\\]" \ 73 "check mi -stack-list-frames command, first time" 74 75gdb_test "interpreter-exec mi \"-stack-list-frames\"" \ 76 "\\^done,stack=\\\[frame=\{level=\"0\",addr=\"$hex\",func=\"breakpt\",file=\"\[^\"\]+\",fullname=\"\[^\"\]+\",line=\"${decimal}\"(,arch=\"\[^\"\]+\")?\},frame=\{level=\"1\",addr=\"$hex\",func=\"func5\",file=\"\[^\"\]+\",fullname=\"\[^\"\]+\",line=\"${decimal}\"(,arch=\"\[^\"\]+\")?\},frame=\{level=\"2\",addr=\"$hex\",func=\"func4\",file=\"\[^\"\]+\",fullname=\"\[^\"\]+\",line=\"${decimal}\"(,arch=\"\[^\"\]+\")?\},frame=\{level=\"3\",addr=\"$hex\",func=\"func3\",file=\"\[^\"\]+\",fullname=\"\[^\"\]+\",line=\"${decimal}\"(,arch=\"\[^\"\]+\")?\}\\\]" \ 77 "check mi -stack-list-frames command, second time" 78