gdb/testsuite/gdb.arch/pa-nullify.exp

   1 # Copyright 2004 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 2 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, write to the Free Software
  15 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  16 #
  17 # This file is part of the gdb testsuite.
  18
  19 if $tracelevel {
  20     strace $tracelevel
  21 }
  22
  23 set prms_id 0
  24 set bug_id 0
  25
  26 # Test handling of nullified instructions for the pa target.
  27
  28 if ![istarget "hppa*-*-*"] then {
  29     verbose "Skipping hppa nullification tests."
  30     return
  31 }
  32
  33 set testfile "pa-nullify"
  34 set srcfile ${testfile}.s
  35 set binfile ${objdir}/${subdir}/${testfile}
  36 set gcorefile ${objdir}/${subdir}/${testfile}.gcore
  37
  38 if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {}] != "" } {
  39     unsupported "Testcase compile failed."
  40     return -1
  41 }
  42
  43 gdb_exit
  44 gdb_start
  45 gdb_reinitialize_dir $srcdir/$subdir
  46 gdb_load ${binfile}
  47
  48 # In the first test, we do a "step" on a function whose last instruction
  49 # contains a branch-with-nullify.  The instruction in the delay slot belongs
  50 # to the next function.  We verify that when we step off the first function
  51 # that we end up back at the caller and not at the second instruction.
  52
  53 gdb_breakpoint foo
  54 gdb_test "run" "Breakpoint 1, .* in foo.*" "Breakpoint at foo"
  55
  56 set test "stepi till main"
  57 gdb_test_multiple "stepi" "${test}" {
  58   -re ".*in foo.*$gdb_prompt $" {
  59     send_gdb "stepi\n"
  60     exp_continue -continue_timer
  61   }
  62   -re ".*in bar.*$gdb_prompt $" {
  63     fail $test
  64   }
  65   -re ".*in main.*$gdb_prompt $" {
  66     pass $test
  67   }
  68 }
  69
  70 # In the second test, we verify that we can get a proper backtrace
  71 # even when we are in a nullified instruction that belongs to the next function.
  72 # We also verify that when stepping over a branch-with-nullify insn that we
  73 # stay on the same insn for two steps.
  74
  75 proc get_addr_of_sym { sym } {
  76   set addr 0
  77   global gdb_prompt
  78   global hex
  79
  80   set test "get address of $sym"
  81   send_gdb "print $sym\n"
  82   gdb_test_multiple "print $sym" $test {
  83     -re ".*($hex) <$sym>.*$gdb_prompt $" {
  84       set addr $expect_out(1,string)
  85       pass $test
  86     }
  87   }
  88
  89   return $addr
  90 }
  91
  92 if { ! [ runto_main ] } then { gdb_suppress_tests; }
  93
  94 set foo [get_addr_of_sym "foo"]
  95 set bar [get_addr_of_sym "bar"]
  96 set foo_last [expr $bar - 4]
  97
  98 gdb_breakpoint "*$foo_last"
  99
 100 gdb_test "continue" "Breakpoint \[0-9\]*,.* in foo.*"
 101 gdb_test "backtrace" "in foo.*in main.*" "Backtrace from last insn in foo"
 102 gdb_test "stepi" "in foo.*" "stepi to nullified instruction stays in foo"
 103 gdb_test "backtrace" "in foo.*in main.*" "Backtrace from nullified insn"
 104 gdb_test "stepi" "in main.*" "stepi to main"
 105
 106 # In the third test, we verify that backtraces from nullified instructions
 107 # work even in coredumps
 108
 109 proc gen_core { test } {
 110   global gcorefile
 111   global gdb_prompt
 112   set gcore_works 0
 113   set escapedfilename [string_to_regexp $gcorefile]
 114
 115   gdb_test_multiple "gcore $gcorefile" "$test: gcore" {
 116     -re "Saved corefile ${escapedfilename}\[\r\n\]+$gdb_prompt $" {
 117       pass "$test: gcore"
 118       set gcore_works 1
 119     }
 120     -re "Can't create a corefile\[\r\n\]+$gdb_prompt $" {
 121       fail "$test: gcore"
 122     }
 123   }
 124
 125   return $gcore_works
 126 }
 127
 128 proc test_core_bt { test } {
 129   global gcorefile
 130
 131   gdb_test "core $gcorefile" "Core was generated by.*" \
 132     "$test: load core file" "A program is being debugged already.*" "y"
 133
 134   gdb_test "backtrace" ".*in foo.*in main.*" "$test: backtrace in gcore"
 135 }
 136
 137 set test "core at last insn in foo"
 138 if { ! [ runto_main ] } then { gdb_suppress_tests; }
 139 gdb_breakpoint "*$foo_last"
 140 gdb_test "continue" "Breakpoint \[0-9\]*,.* in foo.*" "$test: continue to breakpoint"
 141 if [gen_core $test] {
 142   test_core_bt $test
 143 }
 144
 145 set test "core at nullified insn"
 146 if { ! [ runto_main ] } then { gdb_suppress_tests; }
 147 gdb_breakpoint "*$foo_last"
 148 gdb_test "continue" "Breakpoint \[0-9\]*,.* in foo.*" "$test: continue to breakpoint"
 149 gdb_test "stepi" ".*in foo.*" "$test: step to nullified instruction"
 150 if [gen_core $test] {
 151   test_core_bt $test
 152 }