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# Copyright 2023-2024 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/>.
# Test i386 displaced stepping over a call instruction that calls to
# itself. This is pretty unlikely to be seen in the wild, but does
# test a corner case of our displaced step handling.
require is_x86_like_target
set newline "\[\r\n\]*"
set opts {debug nopie}
standard_testfile .S -alarm.c
if { [prepare_for_testing "failed to prepare" $testfile "$srcfile $srcfile2" $opts] } {
return -1
}
gdb_test "set displaced-stepping on" ""
gdb_test "show displaced-stepping" ".* displaced stepping .* is on.*"
if {![runto_main]} {
return 0
}
# Proceed to the test function.
gdb_breakpoint "test_call"
gdb_continue_to_breakpoint "test_call"
# Get the current stack pointer value.
set sp [get_hexadecimal_valueof "\$sp" "*UNKNOWN*"]
# Get the address of the next instruction.
set next_insn_addr ""
gdb_test_multiple "x/2i \$pc" "get address of next insn" {
-re "\r\n=> $hex \[^\r\n\]+\r\n" {
exp_continue
}
-re "^ ($hex) \[^\r\n\]+\r\n" {
set next_insn_addr $expect_out(1,string)
exp_continue
}
-re "^$::gdb_prompt $" {
gdb_assert {![string equal $next_insn_addr ""]} \
$gdb_test_name
}
}
# Clear the slot on the stack and confirm it was set to zero.
set sp [expr $sp - 0x4]
gdb_test_no_output "set {unsigned int} $sp = 0" \
"clear stack slot"
set zero_val 0x[format %08x 0]
gdb_test "x/1wx 0x[format %x $sp]" "$hex:\\s+${zero_val}" \
"check return address slot was set to zero"
# Single step.
gdb_test "stepi" \
"Breakpoint $decimal, test_call \\(\\) at .*"
# Check stack pointer was updated to the expected value.
set new_sp [get_hexadecimal_valueof "\$sp" "*UNKNOWN*" \
"get stack pointer after step"]
gdb_assert {[expr $sp == $new_sp]} \
"check stack pointer was updated as expected"
# Check the contents of the stack were updated to the expected value.
set next_insn_addr 0x[format %08x $next_insn_addr]
gdb_test "x/1wx 0x[format %x $sp]" "$hex:\\s+$next_insn_addr" \
"check return address was updated correctly"
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