gdb/testsuite/gdb.base/savedregs.exp

   1 # Copyright 2004-2014 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
  33 standard_testfile .c
  34
  35 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  36     untested "Couldn't compile ${module}.c"
  37     return -1
  38 }
  39
  40 # get things started
  41 clean_restart ${binfile}
  42
  43 # Advance to main
  44 if { ![runto_main] } {
  45     gdb_suppress_tests
  46 }
  47
  48 proc process_saved_regs { current inner outer } {
  49     global gdb_prompt
  50     global expect_out
  51     global saved_regs
  52
  53     # Skip the CURRENT frame.
  54
  55     set level 1
  56
  57     # Run over the list of INNER frames capturing the "info frame"
  58     # output for each.  Both dummy and sigtramp frames need to be
  59     # handled specially: they do not yet have correct function names;
  60     # and for dummy frames won't have saved registers.  If there's a
  61     # problem, fail but capture the output anyway, hopefully later
  62     # "info frame" requests for that same frame will at least fail in
  63     # a consistent manner (stops propogated fails).
  64
  65     foreach func $inner {
  66         set saved_regs($func) "error"
  67         set test "Get $func info frame"
  68         # Both dummy and sigtramp frames have problems.
  69         switch $func {
  70             dummy {
  71                 # Dummy frame's do not have saved registers, and do
  72                 # not print <dummy>.
  73                 set pat "Stack frame at .*"
  74             }
  75             sigtramp {
  76                 # Sigtramp frames don't yet print <signal trampoline>.
  77                 set pat "Stack frame at .* Saved registers:.*"
  78             }
  79             default {
  80                 set pat "Stack frame at .* in $func .* Saved registers:.*"
  81             }
  82         }
  83         # If the "info frame" barf, capture the output anyway so that
  84         # it does not cascade further failures.
  85         gdb_test_multiple "info frame $level" "$test" {
  86             -re "($pat)$gdb_prompt " {
  87                 set saved_regs($func) "$expect_out(1,string)"
  88                 pass "$test"
  89             }
  90             -re "(Stack frame at .*)$gdb_prompt " {
  91                 set saved_regs($func) "$expect_out(1,string)"
  92                 fail "$test"
  93             }
  94             -re "(Cannot access .*)$gdb_prompt " {
  95                 set saved_regs($func) "$expect_out(1,string)"
  96                 fail "$test"
  97             }
  98         }
  99         incr level
 100     }
 101
 102     # Now iterate through the list of OUTER frames checking that the
 103     # "info frame" output from each still matches what was captured
 104     # during an early query.  To avoid cascading failures, checking is
 105     # abandoned after the first failure.  The assumption is that,
 106     # since frames outer to the botched frame rely on the botched
 107     # frame's info, those more outer frames are also botched.  Besides
 108     # we've got the failure we're after.
 109
 110     set ok 1
 111     foreach func $outer {
 112         set test [concat "Check $func info frame; stack contains" \
 113                       $current $inner $outer]
 114         if $ok {
 115             set ok 0
 116             set pat [string_to_regexp "$saved_regs($func)"]
 117             gdb_test_multiple "info frame $level" "$test" {
 118                 -re "$pat$gdb_prompt " {
 119                     pass "$test"
 120                     set ok 1
 121                 }
 122             }
 123         } {
 124             pass "$test (skipped)"
 125         }
 126         incr level
 127     }
 128 }
 129
 130
 131 # Continue to the signal thrower, capture main's saved-reg info.
 132 gdb_test "advance thrower" "thrower .* at .*"
 133 process_saved_regs thrower { main } { }
 134
 135 # Continue to the signal catcher, check main's saved-reg info, capture
 136 # catcher's saved-reg info.
 137 gdb_test "handle SIGSEGV pass print nostop"
 138 gdb_test "handle SIGILL pass print nostop"
 139 gdb_test "advance catcher" "catcher .* at .*"
 140 process_saved_regs catcher { sigtramp thrower } { main }
 141
 142 # Breakpoint at and call the caller function, saved-regs of main and
 143 # catcher, capture caller's registers.
 144 gdb_test "break caller"
 145 gdb_test "call caller (1,2,3,4,5,6,7,8)"
 146 process_saved_regs caller { dummy catcher } { sigtramp thrower main }
 147
 148 # Run to callee, again check everything.
 149 gdb_test "advance callee" "callee .* at .*"
 150 process_saved_regs callee { caller } { dummy catcher sigtramp thrower main }