| 1 | # Copyright 2004, 2007, 2008, 2009, 2010 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 | # This test is to check that a frame's "info frame", especially the |
| 17 | # saved registers list, doesn't change while that frame isn't current. |
| 18 | |
| 19 | # It uses the program savedregs.c to construct a somewhat warped |
| 20 | # backtrace (contains both signal and dummy frames) and then, at each |
| 21 | # step checks that non-inner frames have consistent "info frame" |
| 22 | # output. Note that a frame's "info frame" can only be captured after |
| 23 | # it is non-current (made a call, interrupted, ...), this is because |
| 24 | # instructions executed to perform the call may affect "info frame" |
| 25 | # output. |
| 26 | |
| 27 | if [target_info exists gdb,nosignals] { |
| 28 | verbose "Skipping savedregs.exp because of nosignals." |
| 29 | continue |
| 30 | } |
| 31 | |
| 32 | if $tracelevel then { |
| 33 | strace $tracelevel |
| 34 | } |
| 35 | |
| 36 | |
| 37 | set testfile savedregs |
| 38 | set srcfile ${testfile}.c |
| 39 | set binfile ${objdir}/${subdir}/${testfile} |
| 40 | if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } { |
| 41 | untested "Couldn't compile ${module}.c" |
| 42 | return -1 |
| 43 | } |
| 44 | |
| 45 | # get things started |
| 46 | gdb_exit |
| 47 | gdb_start |
| 48 | gdb_reinitialize_dir $srcdir/$subdir |
| 49 | gdb_load ${binfile} |
| 50 | |
| 51 | # Advance to main |
| 52 | if { ![runto_main] } { |
| 53 | gdb_suppress_tests; |
| 54 | } |
| 55 | |
| 56 | proc process_saved_regs { current inner outer } { |
| 57 | global gdb_prompt |
| 58 | global expect_out |
| 59 | global saved_regs |
| 60 | |
| 61 | # Skip the CURRENT frame. |
| 62 | |
| 63 | set level 1 |
| 64 | |
| 65 | # Run over the list of INNER frames capturing the "info frame" |
| 66 | # output for each. Both dummy and sigtramp frames need to be |
| 67 | # handled specially: they do not yet have correct function names; |
| 68 | # and for dummy frames won't have saved registers. If there's a |
| 69 | # problem, fail but capture the output anyway, hopefully later |
| 70 | # "info frame" requests for that same frame will at least fail in |
| 71 | # a consistent manner (stops propogated fails). |
| 72 | |
| 73 | foreach func $inner { |
| 74 | set saved_regs($func) "error" |
| 75 | set test "Get $func info frame" |
| 76 | # Both dummy and sigtramp frames have problems. |
| 77 | switch $func { |
| 78 | dummy { |
| 79 | # Dummy frame's do not have saved registers, and do |
| 80 | # not print <dummy>. |
| 81 | set pat "Stack frame at .*" |
| 82 | } |
| 83 | sigtramp { |
| 84 | # Sigtramp frames don't yet print <signal trampoline>. |
| 85 | set pat "Stack frame at .* Saved registers:.*" |
| 86 | } |
| 87 | default { |
| 88 | set pat "Stack frame at .* in $func .* Saved registers:.*" |
| 89 | } |
| 90 | } |
| 91 | # If the "info frame" barf, capture the output anyway so that |
| 92 | # it does not cascade further failures. |
| 93 | gdb_test_multiple "info frame $level" "$test" { |
| 94 | -re "($pat)$gdb_prompt " { |
| 95 | set saved_regs($func) "$expect_out(1,string)" |
| 96 | pass "$test" |
| 97 | } |
| 98 | -re "(Stack frame at .*)$gdb_prompt " { |
| 99 | set saved_regs($func) "$expect_out(1,string)" |
| 100 | fail "$test" |
| 101 | } |
| 102 | -re "(Cannot access .*)$gdb_prompt " { |
| 103 | set saved_regs($func) "$expect_out(1,string)" |
| 104 | fail "$test" |
| 105 | } |
| 106 | } |
| 107 | incr level |
| 108 | } |
| 109 | |
| 110 | # Now iterate through the list of OUTER frames checking that the |
| 111 | # "info frame" output from each still matches what was captured |
| 112 | # during an early query. To avoid cascading failures, checking is |
| 113 | # abandoned after the first failure. The assumption is that, |
| 114 | # since frames outer to the botched frame rely on the botched |
| 115 | # frame's info, those more outer frames are also botched. Besides |
| 116 | # we've got the failure we're after. |
| 117 | |
| 118 | set ok 1 |
| 119 | foreach func $outer { |
| 120 | set test [concat "Check $func info frame; stack contains" \ |
| 121 | $current $inner $outer] |
| 122 | if $ok { |
| 123 | set ok 0 |
| 124 | set pat [string_to_regexp "$saved_regs($func)"] |
| 125 | gdb_test_multiple "info frame $level" "$test" { |
| 126 | -re "$pat$gdb_prompt " { |
| 127 | pass "$test" |
| 128 | set ok 1 |
| 129 | } |
| 130 | } |
| 131 | } { |
| 132 | pass "$test (skipped)" |
| 133 | } |
| 134 | incr level |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | |
| 139 | # Continue to the signal thrower, capture main's saved-reg info. |
| 140 | gdb_test "advance thrower" "thrower .* at .*" |
| 141 | process_saved_regs thrower { main } { } |
| 142 | |
| 143 | # Continue to the signal catcher, check main's saved-reg info, capture |
| 144 | # catcher's saved-reg info. |
| 145 | gdb_test "handle SIGSEGV pass print nostop" |
| 146 | gdb_test "advance catcher" "catcher .* at .*" |
| 147 | process_saved_regs catcher { sigtramp thrower } { main } |
| 148 | |
| 149 | # Breakpoint at and call the caller function, saved-regs of main and |
| 150 | # catcher, capture caller's registers. |
| 151 | gdb_test "break caller" |
| 152 | gdb_test "call caller (1,2,3,4,5,6,7,8)" |
| 153 | process_saved_regs caller { dummy catcher } { sigtramp thrower main } |
| 154 | |
| 155 | # Run to callee, again check everything. |
| 156 | gdb_test "advance callee" "callee .* at .*" |
| 157 | process_saved_regs callee { caller } { dummy catcher sigtramp thrower main } |