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      1 # Copyright (C) 2018-2024 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 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 require {istarget "powerpc*-*-linux*"}
     26 
     27 standard_testfile .c
     28 
     29 if {[build_executable "compile" $binfile $srcfile {debug}] == -1} {
     30     return -1
     31 }
     32 
     33 proc check_register_access { regname } {
     34     global gdb_prompt
     35 
     36     set test "$regname register access"
     37     gdb_test_multiple "info reg $regname" "$test" {
     38 	-re "Invalid register.*\r\n$gdb_prompt $" {
     39 	    unsupported "$test"
     40 	    return 0
     41 	}
     42 	-re "\r\n$regname.*\r\n$gdb_prompt $" {
     43 	    pass "$test"
     44 	    return 1
     45 	}
     46     }
     47     return 0
     48 }
     49 
     50 proc tar_available {} {
     51     global gdb_prompt
     52     global inferior_exited_re
     53 
     54     set test "TAR available to inferior"
     55     gdb_test_multiple "continue" "" {
     56 	-re "Illegal instruction.*\r\n$gdb_prompt $" {
     57 	    unsupported "$test"
     58 	    return 0
     59 	}
     60 	-re "$inferior_exited_re normally.*$gdb_prompt $" {
     61 	    pass "$test"
     62 	    return 1
     63 	}
     64     }
     65     return 0
     66 }
     67 
     68 # Do one pass to check if TAR is usable, system
     69 # software can prevent it from being used.
     70 with_test_prefix "check TAR access" {
     71     clean_restart $binfile
     72 
     73     if ![runto_main] {
     74 	return
     75     }
     76 
     77     if {![check_register_access "tar"]} {
     78 	return
     79     }
     80 
     81     if {![tar_available]} {
     82 	return
     83     }
     84 }
     85 
     86 # Now do the actual test
     87 clean_restart $binfile
     88 
     89 if ![runto_main] {
     90     return
     91 }
     92 
     93 gdb_breakpoint [gdb_get_line_number "marker"]
     94 
     95 gdb_continue_to_breakpoint "continue to marker"
     96 
     97 set target1 [get_hexadecimal_valueof "target1" -1]
     98 set tar [get_hexadecimal_valueof "\$tar" -2]
     99 
    100 set test "TAR value from mtspr"
    101 
    102 if {${target1} == ${tar}} {
    103     pass $test
    104 } else {
    105     fail $test
    106 }
    107 
    108 set target2 [get_hexadecimal_valueof "target2" -1]
    109 
    110 if {$target2 == -1} {
    111     fail "Could not get value of target2"
    112     return
    113 }
    114 
    115 gdb_test_no_output "set \$tar = $target2" "set tar"
    116 
    117 gdb_breakpoint [gdb_get_line_number "marker 2"]
    118 
    119 gdb_continue_to_breakpoint "continue to new target address" ".*marker 2.*"
    120