gdb/testsuite/gdb.base/savedregs.exp

   1 # Copyright 2004-2024 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 require {!target_info exists gdb,nosignals}
  28
  29
  30 standard_testfile .c
  31
  32 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  33     untested "failed to compile"
  34     return -1
  35 }
  36
  37 # get things started
  38 clean_restart ${binfile}
  39
  40 # Advance to main
  41 if {![runto_main]} {
  42     return 0
  43 }
  44
  45 proc process_saved_regs { current inner outer } {
  46     global gdb_prompt
  47     global expect_out
  48     global saved_regs
  49
  50     # Skip the CURRENT frame.
  51
  52     set level 1
  53
  54     # Run over the list of INNER frames capturing the "info frame"
  55     # output for each.  Both dummy and sigtramp frames need to be
  56     # handled specially: they do not yet have correct function names;
  57     # and for dummy frames won't have saved registers.  If there's a
  58     # problem, fail but capture the output anyway, hopefully later
  59     # "info frame" requests for that same frame will at least fail in
  60     # a consistent manner (stops propagated fails).
  61
  62     foreach func $inner {
  63         set saved_regs($func) "error"
  64         set test "get $func info frame"
  65         # Both dummy and sigtramp frames have problems.
  66         switch $func {
  67             dummy {
  68                 # Dummy frame's do not have saved registers, and do
  69                 # not print <dummy>.
  70                 set pat "Stack frame at .*"
  71             }
  72             sigtramp {
  73                 # Sigtramp frames don't yet print <signal trampoline>.
  74                 set pat "Stack frame at .* Saved registers:.*"
  75             }
  76             default {
  77                 set pat "Stack frame at .* in $func .*( Saved registers:.*)?"
  78             }
  79         }
  80         # If the "info frame" barf, capture the output anyway so that
  81         # it does not cascade further failures.
  82         gdb_test_multiple "info frame $level" "$test" {
  83             -re "($pat)$gdb_prompt " {
  84                 set saved_regs($func) "$expect_out(1,string)"
  85                 pass "$test"
  86             }
  87             -re "(Stack frame at .*)$gdb_prompt " {
  88                 set saved_regs($func) "$expect_out(1,string)"
  89                 fail "$test"
  90             }
  91             -re "(Cannot access .*)$gdb_prompt " {
  92                 set saved_regs($func) "$expect_out(1,string)"
  93                 fail "$test"
  94             }
  95         }
  96         incr level
  97     }
  98
  99     # Now iterate through the list of OUTER frames checking that the
 100     # "info frame" output from each still matches what was captured
 101     # during an early query.  To avoid cascading failures, checking is
 102     # abandoned after the first failure.  The assumption is that,
 103     # since frames outer to the botched frame rely on the botched
 104     # frame's info, those more outer frames are also botched.  Besides
 105     # we've got the failure we're after.
 106
 107     set ok 1
 108     foreach func $outer {
 109         set test [concat "Check $func info frame; stack contains" \
 110                       $current $inner $outer]
 111         if $ok {
 112             set ok 0
 113             set pat [string_to_regexp "$saved_regs($func)"]
 114             gdb_test_multiple "info frame $level" "$test" {
 115                 -re "$pat$gdb_prompt " {
 116                     pass "$test"
 117                     set ok 1
 118                 }
 119             }
 120         } {
 121             pass "$test (skipped)"
 122         }
 123         incr level
 124     }
 125 }
 126
 127
 128 # Continue to the signal thrower, capture main's saved-reg info.
 129 gdb_test "advance thrower" "thrower .* at .*"
 130 process_saved_regs thrower { main } { }
 131
 132 # Continue to the signal catcher, check main's saved-reg info, capture
 133 # catcher's saved-reg info.
 134 gdb_test "handle SIGSEGV pass print nostop"
 135 gdb_test "handle SIGILL pass print nostop"
 136 gdb_test "advance catcher" "catcher .* at .*"
 137 process_saved_regs catcher { sigtramp thrower } { main }
 138
 139 # Breakpoint at and call the caller function, saved-regs of main and
 140 # catcher, capture caller's registers.
 141 gdb_test "break caller"
 142 gdb_test "call caller (1,2,3,4,5,6,7,8)"
 143 process_saved_regs caller { dummy catcher } { sigtramp thrower main }
 144
 145 # Run to callee, again check everything.
 146 gdb_test "advance callee" "callee .* at .*"
 147 process_saved_regs callee { caller } { dummy catcher sigtramp thrower main }