gdb/testsuite/gdb.base/savedregs.exp

   1 # Copyright 2004-2013 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 set testfile savedregs
  34 set srcfile ${testfile}.c
  35 set binfile ${objdir}/${subdir}/${testfile}
  36 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  37     untested "Couldn't compile ${module}.c"
  38     return -1
  39 }
  40
  41 # get things started
  42 gdb_exit
  43 gdb_start
  44 gdb_reinitialize_dir $srcdir/$subdir
  45 gdb_load ${binfile}
  46
  47 # Advance to main
  48 if { ![runto_main] } {
  49     gdb_suppress_tests
  50 }
  51
  52 proc process_saved_regs { current inner outer } {
  53     global gdb_prompt
  54     global expect_out
  55     global saved_regs
  56
  57     # Skip the CURRENT frame.
  58
  59     set level 1
  60
  61     # Run over the list of INNER frames capturing the "info frame"
  62     # output for each.  Both dummy and sigtramp frames need to be
  63     # handled specially: they do not yet have correct function names;
  64     # and for dummy frames won't have saved registers.  If there's a
  65     # problem, fail but capture the output anyway, hopefully later
  66     # "info frame" requests for that same frame will at least fail in
  67     # a consistent manner (stops propogated fails).
  68
  69     foreach func $inner {
  70         set saved_regs($func) "error"
  71         set test "Get $func info frame"
  72         # Both dummy and sigtramp frames have problems.
  73         switch $func {
  74             dummy {
  75                 # Dummy frame's do not have saved registers, and do
  76                 # not print <dummy>.
  77                 set pat "Stack frame at .*"
  78             }
  79             sigtramp {
  80                 # Sigtramp frames don't yet print <signal trampoline>.
  81                 set pat "Stack frame at .* Saved registers:.*"
  82             }
  83             default {
  84                 set pat "Stack frame at .* in $func .* Saved registers:.*"
  85             }
  86         }
  87         # If the "info frame" barf, capture the output anyway so that
  88         # it does not cascade further failures.
  89         gdb_test_multiple "info frame $level" "$test" {
  90             -re "($pat)$gdb_prompt " {
  91                 set saved_regs($func) "$expect_out(1,string)"
  92                 pass "$test"
  93             }
  94             -re "(Stack frame at .*)$gdb_prompt " {
  95                 set saved_regs($func) "$expect_out(1,string)"
  96                 fail "$test"
  97             }
  98             -re "(Cannot access .*)$gdb_prompt " {
  99                 set saved_regs($func) "$expect_out(1,string)"
 100                 fail "$test"
 101             }
 102         }
 103         incr level
 104     }
 105
 106     # Now iterate through the list of OUTER frames checking that the
 107     # "info frame" output from each still matches what was captured
 108     # during an early query.  To avoid cascading failures, checking is
 109     # abandoned after the first failure.  The assumption is that,
 110     # since frames outer to the botched frame rely on the botched
 111     # frame's info, those more outer frames are also botched.  Besides
 112     # we've got the failure we're after.
 113
 114     set ok 1
 115     foreach func $outer {
 116         set test [concat "Check $func info frame; stack contains" \
 117                       $current $inner $outer]
 118         if $ok {
 119             set ok 0
 120             set pat [string_to_regexp "$saved_regs($func)"]
 121             gdb_test_multiple "info frame $level" "$test" {
 122                 -re "$pat$gdb_prompt " {
 123                     pass "$test"
 124                     set ok 1
 125                 }
 126             }
 127         } {
 128             pass "$test (skipped)"
 129         }
 130         incr level
 131     }
 132 }
 133
 134
 135 # Continue to the signal thrower, capture main's saved-reg info.
 136 gdb_test "advance thrower" "thrower .* at .*"
 137 process_saved_regs thrower { main } { }
 138
 139 # Continue to the signal catcher, check main's saved-reg info, capture
 140 # catcher's saved-reg info.
 141 gdb_test "handle SIGSEGV pass print nostop"
 142 gdb_test "handle SIGILL pass print nostop"
 143 gdb_test "advance catcher" "catcher .* at .*"
 144 process_saved_regs catcher { sigtramp thrower } { main }
 145
 146 # Breakpoint at and call the caller function, saved-regs of main and
 147 # catcher, capture caller's registers.
 148 gdb_test "break caller"
 149 gdb_test "call caller (1,2,3,4,5,6,7,8)"
 150 process_saved_regs caller { dummy catcher } { sigtramp thrower main }
 151
 152 # Run to callee, again check everything.
 153 gdb_test "advance callee" "callee .* at .*"
 154 process_saved_regs callee { caller } { dummy catcher sigtramp thrower main }