1 # This testcase is part of GDB, the GNU debugger.
3 # Copyright 2011-2016 Free Software Foundation, Inc.
5 # This program is free software; you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation; either version 3 of the License, or
8 # (at your option) any later version.
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with this program. If not, see <http://www.gnu.org/licenses/>.
18 if { ![support_displaced_stepping] } {
19 unsupported "displaced stepping"
25 # Define the syscall instruction for each target.
27 if { [istarget "i\[34567\]86-*-linux*"] || [istarget "x86_64-*-linux*"] } {
28 set syscall_insn "\[ \t\](int|syscall|sysenter)\[ \t\]"
29 } elseif { [istarget "aarch64*-*-linux*"] || [istarget "arm*-*-linux*"] } {
30 set syscall_insn "\[ \t\](swi|svc)\[ \t\]"
35 proc check_pc_after_cross_syscall { syscall syscall_insn_next_addr } {
36 set syscall_insn_next_addr_found [get_hexadecimal_valueof "\$pc" "0"]
38 set test "single step over $syscall final pc"
39 if {$syscall_insn_next_addr != 0
40 && $syscall_insn_next_addr == $syscall_insn_next_addr_found} {
47 # Restart GDB and set up the test. Return a list in which the first one
48 # is the address of syscall instruction and the second one is the address
49 # of the next instruction address of syscall instruction. If anything
50 # wrong, the two elements of list are -1.
52 proc setup { syscall } {
53 global gdb_prompt syscall_insn
55 set testfile "disp-step-$syscall"
57 clean_restart $testfile
59 if { ![runto main] } then {
60 fail "run to main ($syscall)"
64 # Delete the breakpoint on main.
65 gdb_test_no_output "delete break 1"
67 gdb_test_no_output "set displaced-stepping off"
69 gdb_test "break $syscall" "Breakpoint \[0-9\]* at .*"
71 gdb_test "continue" "Continuing\\..*Breakpoint \[0-9\]+, (.* in |__libc_|)$syscall \\(\\).*" \
72 "continue to $syscall (1st time)"
73 # Hit the breakpoint on $syscall for the first time. In this time,
74 # we will let PLT resolution done, and the number single steps we will
75 # do later will be reduced.
77 gdb_test "continue" "Continuing\\..*Breakpoint \[0-9\]+, (.* in |__libc_|)$syscall \\(\\).*" \
78 "continue to $syscall (2nd time)"
79 # Hit the breakpoint on $syscall for the second time. In this time,
80 # the address of syscall insn and next insn of syscall are recorded.
82 gdb_test "display/i \$pc" ".*"
84 # Single step until we see a syscall insn or we reach the
85 # upper bound of loop iterations.
86 set msg "find syscall insn in $syscall"
89 gdb_test_multiple "stepi" $msg {
90 -re ".*$syscall_insn.*$gdb_prompt $" {
93 -re "x/i .*=>.*\r\n$gdb_prompt $" {
95 if {$steps == $max_steps} {
104 if {$steps == $max_steps} {
108 set syscall_insn_addr [get_hexadecimal_valueof "\$pc" "0"]
109 if {[gdb_test "stepi" "x/i .*=>.*" "stepi $syscall insn"] != 0} {
112 return [list $syscall_insn_addr [get_hexadecimal_valueof "\$pc" "0"]]
115 proc disp_step_cross_syscall { syscall } {
116 with_test_prefix "$syscall" {
120 set testfile "disp-step-$syscall"
122 if [build_executable ${testfile}.exp ${testfile} ${testfile}.c {debug}] {
123 untested ${testfile}.exp
127 set ret [setup $syscall]
129 set syscall_insn_addr [lindex $ret 0]
130 set syscall_insn_next_addr [lindex $ret 1]
131 if { $syscall_insn_addr == -1 } {
135 gdb_test "continue" "Continuing\\..*Breakpoint \[0-9\]+, (.* in |__libc_|)$syscall \\(\\).*" \
136 "continue to $syscall (3rd time)"
138 # Hit the breakpoint on $syscall for the third time. In this time, we'll set
139 # breakpoint on the syscall insn we recorded previously, and single step over it.
141 set syscall_insn_bp 0
142 gdb_test_multiple "break \*$syscall_insn_addr" "break on syscall insn" {
143 -re "Breakpoint (\[0-9\]*) at .*$gdb_prompt $" {
144 set syscall_insn_bp $expect_out(1,string)
145 pass "break on syscall insns"
149 gdb_test "continue" "Continuing\\..*Breakpoint \[0-9\]+, .*" \
150 "continue to syscall insn $syscall"
152 gdb_test_no_output "set displaced-stepping on"
154 # Check the address of next instruction of syscall.
155 if {[gdb_test "stepi" "x/i .*=>.*" "single step over $syscall"] != 0} {
159 check_pc_after_cross_syscall $syscall $syscall_insn_next_addr
161 # Delete breakpoint syscall insns to avoid interference to other syscalls.
164 gdb_test "break marker" "Breakpoint.*at.* file .*${testfile}.c, line.*"
165 gdb_test "continue" "Continuing\\..*Breakpoint \[0-9\]+, marker \\(\\) at.*" \
166 "continue to marker ($syscall)"
170 disp_step_cross_syscall "fork"
171 disp_step_cross_syscall "vfork"