gdb/testsuite/gdb.arch/arm-disp-step.exp

# Copyright 2010, 2011 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/>.

# This file is part of the gdb testsuite.

# Test arm displaced stepping.

if $tracelevel {
    strace $tracelevel
}

if {![istarget "arm*-*-*"]} then {
    verbose "Skipping arm displaced stepping tests."
    return
}

set testfile "arm-disp-step"
set srcfile ${testfile}.S
set binfile ${objdir}/${subdir}/${testfile}

set additional_flags "-Wa,-g"

if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [list debug $additional_flags]] != "" } {
    untested arm-disp-step.exp
    return -1
}


#########################################
# Test ldm/stm related to PC.
proc test_ldm_stm_pc {} {
    global srcfile
    # Try to set breakpoint on test_ldm_stm_pc.  If symbol 'test_ldm_stm_pc'
    # can't be resolved, test case is compiled in Thumb mode, skip it.
    gdb_test_multiple "break *test_ldm_stm_pc" "break test_ldm_stm_pc" {
	-re "Breakpoint.*at.* file .*$srcfile, line.*" {
	    pass "break test_ldm_stm_pc"
	}
	-re "Function \"test_ldm_stm_pc\" not defined\..*Make breakpoint pending on future shared library load.*y or .n.. $" {
	    gdb_test "n" "" "Test case is compiled in Thumb mode"
	    return
	}
    }

    gdb_test "break *test_ldm_pc" \
	"Breakpoint.*at.* file .*$srcfile, line.*" \
	"break test_ldm_pc"
    gdb_test "break *test_ldm_stm_pc_ret" \
	"Breakpoint.*at.* file .*$srcfile, line.*" \
	"break test_ldm_stm_pc_ret"

    gdb_continue_to_breakpoint "continue to test_ldm_stm_pc" \
	".*stmdb.*sp\!\,.*\{lr\, pc\}.*"
    gdb_continue_to_breakpoint "continue to test_ldm_pc" \
	".*ldmia.*sp\!\,.*\{pc\}.*"
    gdb_continue_to_breakpoint "continue to test_ldm_stm_pc_ret" \
	".*bx lr.*"
}
##########################################
# Test call/ret.
proc test_call_ret {} {
    global srcfile
    gdb_test "break *test_call_end" \
	"Breakpoint.*at.* file .*$srcfile, line.*" \
	"break test_call_end"
    gdb_test "break *test_ret" \
	"Breakpoint.*at.* file .*$srcfile, line.*" \
	"break test_ret"
    gdb_test "break *test_ret_end" \
	"Breakpoint.*at.* file .*$srcfile, line.*" \
	"break test_ret_end"

    gdb_continue_to_breakpoint "continue to test_call_end" \
	".*@ Location test_call_end.*"
    gdb_continue_to_breakpoint "continue to test_ret" \
	".*bx lr.*"
    gdb_continue_to_breakpoint "continue to test_ret_end" \
	".*@ Location test_ret_end.*"
}


#########################################
# Test branch
proc test_branch {} {
    global srcfile
    gdb_test "break *test_branch" \
	"Breakpoint.*at.* file .*$srcfile, line.*" \
	"break test_branch"
    gdb_test "break *L_branch" \
	"Breakpoint.*at.* file .*$srcfile, line.*" \
	"break Lbranch"

    gdb_continue_to_breakpoint "continue to test_branch" \
	".*b.*L_branch.*"
    gdb_continue_to_breakpoint "continue to Lbranch" \
	".*bx lr.*"
}

#########################################

# Test ldr from pc
proc test_ldr_from_pc {} {
    global srcfile
    gdb_test "break *test_ldr_pc" \
	"Breakpoint.*at.* file .*$srcfile, line.*" \
	"break test_ldr_pc"
    gdb_test "break test_ldr_pc_ret" \
	"Breakpoint.*at.* file .*$srcfile, line.*" \
	"break test_ldr_pc_ret"

    gdb_continue_to_breakpoint "continue to test_ldr_pc" \
	".*ldr.*r1\,.*\[pc, #0\].*"
    gdb_continue_to_breakpoint "continue to Lbranch" \
	".*bx lr.*"
}

###########################################

proc test_str_pc {} {
    global srcfile
    gdb_test_multiple "break *test_str_pc" "break test_str_pc" {
	-re "Breakpoint.*at.* file .*$srcfile, line.*" {
	    pass "break test_str_pc"
	}
	-re "No symbol.*" {
	    pass "break test_str_pc"
	    return
	}
    }
    gdb_test "break *test_str_pc_end" \
	"Breakpoint.*at.* file .*$srcfile, line.*" \
	"break test_str_pc_end"

    # Set breakpoint on both lables pc_offset_right and pc_offset_wrong
    gdb_test "break *pc_offset_right" \
	"Breakpoint.*at.* file .*$srcfile, line.*" \
	"break pc_offset_right"
    gdb_test "break *pc_offset_wrong" \
	"Breakpoint.*at.* file .*$srcfile, line.*" \
	"break pc_offset_wrong"

    gdb_continue_to_breakpoint "continue to test_str_pc" \
	".*str.*pc\,.*\[sp, #-4\].*"
    # If breakpoint on lable pc_offset_wrong is hit, that means the offset
    # computed in displaced stepping is different from offset computed
    # without displaced stepping.  Report a failure.
    gdb_continue_to_breakpoint "continue to pc_offset_right" \
	".*b.*test_str_pc_end.*"
    gdb_continue_to_breakpoint "continue to test_str_pc_end" \
	".*bx lr.*"
}

# Get things started.

clean_restart ${testfile}

# Turn displaced stepping off before runto main. When displaced stepping
# is on, and we type 'run', GDB will first try to single step on _dl_debug_state,
# which is in library might be compiled in Thumb.
gdb_test_no_output "set displaced-stepping off"

if ![runto_main] then {
    fail "Can't run to main"
    return 0
}

gdb_test_no_output "set displaced-stepping on"
gdb_test "show displaced-stepping" ".* displaced stepping .* is on.*"

gdb_test "break *test_call" \
	"Breakpoint.*at.* file .*$srcfile, line.*" \
	"break test_call"

gdb_test_multiple "continue" "continue to test_call" {
	-re ".*bl test_call_subr.*" {
	    pass "continue to test_call"
	}
	-re "Displaced stepping is only supported in" {
	    kfail "gdb/NNNN" $testfile
	    return
	}
    }

test_call_ret

test_branch

test_ldr_from_pc

test_ldm_stm_pc

test_str_pc
##########################################

# Done, run program to exit.

gdb_continue_to_end "arm-disp-step"