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# This testcase is part of GDB, the GNU debugger.
# Copyright 2011-2016 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/>.
if { ![support_displaced_stepping] } {
unsupported "displaced stepping"
return -1
}
set syscall_insn ""
# Define the syscall instruction for each target.
if { [istarget "i\[34567\]86-*-linux*"] || [istarget "x86_64-*-linux*"] } {
set syscall_insn "\[ \t\](int|syscall|sysenter)\[ \t\]"
} elseif { [istarget "aarch64*-*-linux*"] || [istarget "arm*-*-linux*"] } {
set syscall_insn "\[ \t\](swi|svc)\[ \t\]"
} else {
return -1
}
proc check_pc_after_cross_syscall { syscall syscall_insn_next_addr } {
set syscall_insn_next_addr_found [get_hexadecimal_valueof "\$pc" "0"]
set test "single step over $syscall final pc"
if {$syscall_insn_next_addr != 0
&& $syscall_insn_next_addr == $syscall_insn_next_addr_found} {
pass $test
} else {
fail $test
}
}
# Restart GDB and set up the test. Return a list in which the first one
# is the address of syscall instruction and the second one is the address
# of the next instruction address of syscall instruction. If anything
# wrong, the two elements of list are -1.
proc setup { syscall } {
global gdb_prompt syscall_insn
set testfile "disp-step-$syscall"
clean_restart $testfile
if { ![runto main] } then {
fail "run to main ($syscall)"
return -1
}
# Delete the breakpoint on main.
gdb_test_no_output "delete break 1"
gdb_test_no_output "set displaced-stepping off"
gdb_test "break $syscall" "Breakpoint \[0-9\]* at .*"
gdb_test "continue" "Continuing\\..*Breakpoint \[0-9\]+, (.* in |__libc_|)$syscall \\(\\).*" \
"continue to $syscall (1st time)"
# Hit the breakpoint on $syscall for the first time. In this time,
# we will let PLT resolution done, and the number single steps we will
# do later will be reduced.
gdb_test "continue" "Continuing\\..*Breakpoint \[0-9\]+, (.* in |__libc_|)$syscall \\(\\).*" \
"continue to $syscall (2nd time)"
# Hit the breakpoint on $syscall for the second time. In this time,
# the address of syscall insn and next insn of syscall are recorded.
gdb_test "display/i \$pc" ".*"
# Single step until we see a syscall insn or we reach the
# upper bound of loop iterations.
set msg "find syscall insn in $syscall"
set steps 0
set max_steps 1000
gdb_test_multiple "stepi" $msg {
-re ".*$syscall_insn.*$gdb_prompt $" {
pass $msg
}
-re "x/i .*=>.*\r\n$gdb_prompt $" {
incr steps
if {$steps == $max_steps} {
fail $msg
} else {
send_gdb "stepi\n"
exp_continue
}
}
}
if {$steps == $max_steps} {
return { -1, -1 }
}
set syscall_insn_addr [get_hexadecimal_valueof "\$pc" "0"]
if {[gdb_test "stepi" "x/i .*=>.*" "stepi $syscall insn"] != 0} {
return { -1, -1 }
}
return [list $syscall_insn_addr [get_hexadecimal_valueof "\$pc" "0"]]
}
proc disp_step_cross_syscall { syscall } {
with_test_prefix "$syscall" {
global syscall_insn
global gdb_prompt
set testfile "disp-step-$syscall"
if [build_executable ${testfile}.exp ${testfile} ${testfile}.c {debug}] {
untested ${testfile}.exp
return -1
}
set ret [setup $syscall]
set syscall_insn_addr [lindex $ret 0]
set syscall_insn_next_addr [lindex $ret 1]
if { $syscall_insn_addr == -1 } {
return -1
}
gdb_test "continue" "Continuing\\..*Breakpoint \[0-9\]+, (.* in |__libc_|)$syscall \\(\\).*" \
"continue to $syscall (3rd time)"
# Hit the breakpoint on $syscall for the third time. In this time, we'll set
# breakpoint on the syscall insn we recorded previously, and single step over it.
set syscall_insn_bp 0
gdb_test_multiple "break \*$syscall_insn_addr" "break on syscall insn" {
-re "Breakpoint (\[0-9\]*) at .*$gdb_prompt $" {
set syscall_insn_bp $expect_out(1,string)
pass "break on syscall insns"
}
}
gdb_test "continue" "Continuing\\..*Breakpoint \[0-9\]+, .*" \
"continue to syscall insn $syscall"
gdb_test_no_output "set displaced-stepping on"
# Check the address of next instruction of syscall.
if {[gdb_test "stepi" "x/i .*=>.*" "single step over $syscall"] != 0} {
return -1
}
check_pc_after_cross_syscall $syscall $syscall_insn_next_addr
# Delete breakpoint syscall insns to avoid interference to other syscalls.
delete_breakpoints
gdb_test "break marker" "Breakpoint.*at.* file .*${testfile}.c, line.*"
gdb_test "continue" "Continuing\\..*Breakpoint \[0-9\]+, marker \\(\\) at.*" \
"continue to marker ($syscall)"
}
}
disp_step_cross_syscall "fork"
disp_step_cross_syscall "vfork"
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