gdb/testsuite/gdb.arch/powerpc-tar.exp

   1 # Copyright (C) 2018-2019 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 file is part of the gdb testsuite.
  17
  18 # Test access to special purpose register TAR (the Target Address
  19 # Register).  The test inferior writes to this register, we check that
  20 # GDB reads the same value, then write to the register the address of
  21 # another label.  We then let the inferior continue and execute a
  22 # branch to TAR and check that we stop at the address that we wrote to
  23 # register.
  24
  25 if {![istarget "powerpc*-*-linux*"]} then {
  26     verbose "Skipping PowerPC test for the TAR register."
  27     return
  28 }
  29
  30 standard_testfile .c
  31
  32 if {[build_executable "compile" $binfile $srcfile {debug}] == -1} {
  33     return -1
  34 }
  35
  36 proc check_register_access { regname } {
  37     global gdb_prompt
  38
  39     set test "$regname register access"
  40     gdb_test_multiple "info reg $regname" "$test" {
  41         -re "Invalid register.*\r\n$gdb_prompt $" {
  42             unsupported "$test"
  43             return 0
  44         }
  45         -re "\r\n$regname.*\r\n$gdb_prompt $" {
  46             pass "$test"
  47             return 1
  48         }
  49     }
  50     return 0
  51 }
  52
  53 proc tar_available {} {
  54     global gdb_prompt
  55     global inferior_exited_re
  56
  57     set test "TAR available to inferior"
  58     gdb_test_multiple "continue" "" {
  59         -re "Illegal instruction.*\r\n$gdb_prompt $" {
  60             unsupported "$test"
  61             return 0
  62         }
  63         -re "$inferior_exited_re normally.*$gdb_prompt $" {
  64             pass "$test"
  65             return 1
  66         }
  67     }
  68     return 0
  69 }
  70
  71 # Do one pass to check if TAR is usable, system
  72 # software can prevent it from being used.
  73 with_test_prefix "check TAR access" {
  74     clean_restart $binfile
  75
  76     if ![runto_main] {
  77         return
  78     }
  79
  80     if {![check_register_access "tar"]} {
  81         return
  82     }
  83
  84     if {![tar_available]} {
  85         return
  86     }
  87 }
  88
  89 # Now do the actual test
  90 clean_restart $binfile
  91
  92 if ![runto_main] {
  93     return
  94 }
  95
  96 gdb_breakpoint [gdb_get_line_number "marker"]
  97
  98 gdb_continue_to_breakpoint "continue to marker"
  99
 100 set target1 [get_hexadecimal_valueof "target1" -1]
 101 set tar [get_hexadecimal_valueof "\$tar" -2]
 102
 103 set test "TAR value from mtspr"
 104
 105 if {${target1} == ${tar}} {
 106     pass $test
 107 } else {
 108     fail $test
 109 }
 110
 111 set target2 [get_hexadecimal_valueof "target2" -1]
 112
 113 if {$target2 == -1} {
 114     fail "Could not get value of target2"
 115     return
 116 }
 117
 118 gdb_test_no_output "set \$tar = $target2" "set tar"
 119
 120 gdb_breakpoint [gdb_get_line_number "marker 2"]
 121
 122 gdb_continue_to_breakpoint "continue to new target address" ".*marker 2.*"