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# Copyright 2004-2020 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/>.
#
# This file is part of the gdb testsuite.
# Test handling of nullified instructions for the pa target.
switch -glob -- [istarget] {
"hppa-*-*" {
set testfile "pa-nullify"
}
"hppa64-*-*" {
set testfile "pa64-nullify"
}
"*" {
verbose "Skipping hppa nullification tests."
return
}
}
set srcfile ${testfile}.s
set binfile ${objdir}/${subdir}/${testfile}
set gcorefile ${objdir}/${subdir}/${testfile}.gcore
if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {}] != "" } {
unsupported "failed to compile"
return -1
}
gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}
# In the first test, we do a "step" on a function whose last instruction
# contains a branch-with-nullify. The instruction in the delay slot belongs
# to the next function. We verify that when we step off the first function
# that we end up back at the caller and not at the second instruction.
gdb_breakpoint foo
gdb_test "run" "Breakpoint 1, .* in foo.*" "breakpoint at foo"
set test "stepi till main"
gdb_test_multiple "stepi" "${test}" {
-re ".*in foo.*$gdb_prompt $" {
send_gdb "stepi\n"
exp_continue -continue_timer
}
-re ".*in bar.*$gdb_prompt $" {
fail $test
}
-re ".*in main.*$gdb_prompt $" {
pass $test
}
}
# In the second test, we verify that we can get a proper backtrace
# even when we are in a nullified instruction that belongs to the next function.
# We also verify that when stepping over a branch-with-nullify insn that we
# stay on the same insn for two steps.
proc get_addr_of_sym { sym } {
set addr 0
global gdb_prompt
global hex
set test "get address of $sym"
gdb_test_multiple "print $sym" $test {
-re ".*($hex) <$sym>.*$gdb_prompt $" {
set addr $expect_out(1,string)
pass $test
}
}
return $addr
}
if ![runto_main] then {
fail "can't run to main"
return 0
}
set foo [get_addr_of_sym "foo"]
set bar [get_addr_of_sym "bar"]
set foo_last "(bar - 4)"
gdb_breakpoint "*$foo_last"
gdb_test "continue" "Breakpoint \[0-9\]*,.* in foo.*"
gdb_test "backtrace" "in foo.*in main.*" "backtrace from last insn in foo"
gdb_test "stepi" "in foo.*" "stepi to nullified instruction stays in foo"
gdb_test "backtrace" "in foo.*in main.*" "backtrace from nullified insn"
gdb_test "stepi" "in main.*" "stepi to main"
# In the third test, we verify that backtraces from nullified instructions
# work even in coredumps
proc gen_core { test } {
global gcorefile
set gcore_works [gdb_gcore_cmd $gcorefile "$test: gcore"]
return $gcore_works
}
proc test_core_bt { test } {
global gcorefile
gdb_test "core $gcorefile" "Core was generated by.*" \
"$test: load core file" "A program is being debugged already.*" "y"
gdb_test "backtrace" ".*in foo.*in main.*" "$test: backtrace in gcore"
}
set test "core at last insn in foo"
if ![runto_main] then {
fail "can't run to main"
return 0
}
gdb_breakpoint "*$foo_last"
gdb_test "continue" "Breakpoint \[0-9\]*,.* in foo.*" "$test: continue to breakpoint"
if [gen_core $test] {
test_core_bt $test
}
set test "core at nullified insn"
if ![runto_main] then {
fail "can't run to main"
return 0
}
gdb_breakpoint "*$foo_last"
gdb_test "continue" "Breakpoint \[0-9\]*,.* in foo.*" "$test: continue to breakpoint"
gdb_test "stepi" ".*in foo.*" "$test: step to nullified instruction"
if [gen_core $test] {
test_core_bt $test
}
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