gdb/testsuite/gdb.arch/alpha-step.exp

# Copyright 2005-2020 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


if ![istarget "alpha*-*-*"] then {
    verbose "Skipping alpha step tests."
    return
}

set testfile "alpha-step"
set srcfile ${testfile}.c
set binfile ${objdir}/${subdir}/${testfile}

if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {}] != "" } {
    unsupported "failed to compile"
    return -1
}

gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}

proc test_stepi {function } {
    # Restart the program from scratch. If GDB got confused during one
    # of the previous tests, this makes sure that it doesn't affect
    # this series of tests.
    if ![runto_main] then {
        fail "can't run to main"
        return 0
    }

    # Insert a breakpoint on the FP branch instruction inside FUNCTION.
    # Since the function has been hand written, we know this instruction
    # is a "fb$function" located at FUNCTION+4.
    gdb_test "break *$function+4" \
             "Breakpoint .* at .*" \
             "breakpoint on fb$function instruction"
    
    gdb_test "continue" \
             "Breakpoint .*, 0x\[0-9a-fA-F\]+ in $function\(\).*" \
             "continue to fb$function instruction (first call)"
    
    # Extra check to make sure we stopped on the FP branch instruction.
    
    gdb_test "x /i \$pc" \
             "0x\[0-9a-fA-F\]+ <.*>:\[ \t\]+fb$function.*" \
             "Check breakpoint on fb$function instruction (first call)"
    
    # Step test, followed by the check that we landed on the expected
    # instruction (the testcase should be written in such a way that
    # the branch is taken on the first call to this function.
    
    gdb_test "stepi" \
             "0x\[0-9a-fA-F\]+.*" \
             "stepi on fb$function (first call)"
    
    gdb_test "x /i \$pc" \
             "0x\[0-9a-fA-F\]+ <.*>:\[ \t\]+ret.*" \
             "Check stepi over fb$function stopped on ret"
    
    # Continue again. FUNCTION should be called a second time, this time
    # with an argument such that the FP branch will not be taken.
    
    gdb_test "continue" \
             "Breakpoint .*, 0x\[0-9a-fA-F\]+ in $function\(\).*" \
             "continue to fb$function instruction (second call)"
    
    # Extra check to make sure we stopped on the FP branch instruction.
    
    gdb_test "x /i \$pc" \
             "0x\[0-9a-fA-F\]+ <.*>:\[ \t\]+fb$function.*" \
             "Check breakpoint on fb$function instruction (second call)"
    
    # Step test, branch should not be taken.
    
    gdb_test "stepi" \
             "0x\[0-9a-fA-F\]+.*" \
             "stepi on fb$function (branch not taken)"
    
    # Extra check to verify that we landed on the instruction we expected.
    
    gdb_test "x /i \$pc" \
             "0x\[0-9a-fA-F\]+ <.*>:\[ \t\]+fneg.*" \
             "check stepi over fb$function stopped on fneg instruction"

}

test_stepi "gt"
test_stepi "ge"
test_stepi "lt"
test_stepi "le"
test_stepi "eq"
test_stepi "ne"