gdb/testsuite/gdb.reverse/finish-reverse-bkpt.exp

# Copyright 2008-2025 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.
#
# 'reverse-finish' used to have a bug where user breakpoints set at
# the functions entry would be ignored.  Make sure the bug doesn't
# reappear.

# The test sets a breakpoint with the command break *void_func 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.
#
#   <void_func>:
#  	lis     r2,4098        <- GEP
#   	addi    r2,r2,32512
#   	mflr    r0             <- LEP
#   	std     r0,16(r1)
#        ....

#
# The command break *void_func sets the breakpoint on the GEP.  Calling
# the function with void_func() will enter the function via the LEP.  So,
# this test needs to use a function pointer to call void_func() 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"
}

# Start the test.
set breakloc [gdb_get_line_number "VOID FUNC" "$srcfile"]
gdb_test "tbreak void_func" \
    "Temporary breakpoint $decimal at .*$srcfile, line $breakloc\." \
    "set breakpoint on void_func"
gdb_continue_to_breakpoint "void_func" ".*$srcfile:$breakloc.*"

# We stop at the brekapoint on void_func, but breakpoint on
# *void_func will be set at the same place if function void_func doesn't
# have prologue.  One step forward to avoid this.
gdb_test "si"

gdb_test "break \*void_func" \
    "Breakpoint $decimal at .*" \
    "set breakpoint at void_func's entry"

gdb_test "reverse-finish" \
    ".*Breakpoint .*, void_func.*" \
    "reverse-finish from void_func trips breakpoint at entry"

gdb_test "frame" "#0  void_func.*" "no spurious proceed after breakpoint stop"