| # This testcase is part of GDB, the GNU debugger. |
| |
| # Copyright 2011-2015 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 "arm*-*-linux*"] { |
| set syscall_insn "\[ \t\](swi|svc)\[ \t\]" |
| } else { |
| return -1 |
| } |
| |
| proc disp_step_cross_syscall { syscall } { |
| with_test_prefix "$syscall" { |
| global syscall_insn |
| global gdb_prompt |
| |
| set testfile "disp-step-$syscall" |
| |
| if [prepare_for_testing ${testfile}.exp ${testfile} ${testfile}.c {debug}] { |
| untested ${testfile}.exp |
| return -1 |
| } |
| |
| if { ![runto main] } then { |
| fail "run to main ($syscall)" |
| return |
| } |
| |
| set is_target_remote [gdb_is_target_remote] |
| |
| # Delete the breakpoint on main. |
| gdb_test_no_output "delete break 1" |
| |
| gdb_test "break marker" "Breakpoint.*at.* file .*${testfile}.c, line.*" |
| gdb_test_no_output "set displaced-stepping off" |
| |
| set syscall_bp 0 |
| gdb_test_multiple "break $syscall" "break $syscall" { |
| -re "Breakpoint (\[0-9\]*) at .*$gdb_prompt $" { |
| set syscall_bp $expect_out(1,string) |
| pass "break $syscall" |
| } |
| } |
| |
| 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 |
| } |
| |
| set syscall_insn_addr [get_hexadecimal_valueof "\$pc" "0"] |
| if {[gdb_test "stepi" "x/i .*=>.*" "stepi $syscall insn"] != 0} { |
| return -1 |
| } |
| set syscall_insn_next_addr [get_hexadecimal_valueof "\$pc" "0"] |
| |
| 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_no_output "delete $syscall_bp" "delete break $syscall" |
| |
| gdb_test "continue" "Continuing\\..*Breakpoint \[0-9\]+, .*" \ |
| "continue to syscall insn $syscall" |
| |
| gdb_test_no_output "set displaced-stepping on" |
| |
| # Check the address of next instruction of syscall. |
| if {$syscall == "vfork" && $is_target_remote} { |
| setup_kfail server/13796 "*-*-*" |
| } |
| |
| if {[gdb_test "stepi" "x/i .*=>.*" "single step over $syscall"] != 0} { |
| return -1 |
| } |
| |
| 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 |
| } |
| |
| # Delete breakpoint syscall insns to avoid interference to other syscalls. |
| gdb_test_no_output "delete $syscall_insn_bp" "delete break $syscall insn" |
| |
| gdb_test "continue" "Continuing\\..*Breakpoint \[0-9\]+, marker \\(\\) at.*" \ |
| "continue to marker ($syscall)" |
| } |
| } |
| |
| disp_step_cross_syscall "fork" |
| disp_step_cross_syscall "vfork" |