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# Copyright 2008-2024 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. It tests reverse stepping.
#
# reverse-next over a function call sets a step-resume breakpoint at
# callee's entry point, runs to it, and then does an extra single-step
# to get at the callee's caller. Test that a user breakpoint set at
# the same location as the step-resume breakpoint isn't ignored.
#
# The test sets a breakpoint with the command break *callee to set a
# breakpoint on the first instruction of the function. The issue is on
# PowerPC it uses Global Entry Points (GEP) and Local Entry Points (LEP).
# The GEP is the first instruction in the function. It sets up register
# r2 and then reaches the LEP.
#
# <callee>:
# lis r2,4098 <- GEP
# addi r2,r2,32512
# mflr r0 <- LEP
# std r0,16(r1)
#
# The command break *callee sets the breakpoint on the GEP. Calling
# the function with callee() will enter the function via the LEP. So,
# this test needs to use a function pointer to call callee() so the
# function will be entered via the GEP to work as designed on PowerPC in
# addition to non-PowerPC systems. On non-PowerPC systems, the GEP and LEP
# are the same.
require supports_reverse
standard_testfile
if { [prepare_for_testing "failed to prepare" $testfile $srcfile] } {
return -1
}
if {![runto_main]} {
return 0
}
if [supports_process_record] {
# Activate process record/replay
gdb_test_no_output "record" "turn on process record"
}
# Stop after the function pointer call to test the reverse-next command.
set lineno [gdb_get_line_number "END OF MAIN"]
gdb_test "advance $lineno" ".*END OF MAIN.*" \
"get past callee call"
gdb_test "b \*callee" "" "set breakpoint at callee's entry"
set bpnum [get_integer_valueof "\$bpnum" 0]
gdb_test "reverse-next" \
"Breakpoint $bpnum, callee.*" \
"reverse-next over call trips user breakpoint at function entry"
gdb_test "up" \
".*FUNCTION PTR CALL TO CALLEE.*" \
"stopped at the right callee call"
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