1# Copyright 2010-2020 Free Software Foundation, Inc.
2
3# This program is free software; you can redistribute it and/or modify
4# it under the terms of the GNU General Public License as published by
5# the Free Software Foundation; either version 3 of the License, or
6# (at your option) any later version.
7#
8# This program is distributed in the hope that it will be useful,
9# but WITHOUT ANY WARRANTY; without even the implied warranty of
10# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11# GNU General Public License for more details.
12#
13# You should have received a copy of the GNU General Public License
14# along with this program.  If not, see <http://www.gnu.org/licenses/>.
15
16# The problem was due to amd64_skip_prologue attempting to access inferior
17# memory before the PIE (Position Independent Executable) gets relocated.
18
19global inferior_spawn_id
20global gdb_spawn_id
21
22if ![istarget *-linux*] {
23    continue
24}
25
26# In remote mode we cannot use the 'set args' command, and this
27# test requires it.
28if { [target_info exists gdb_protocol] } then {
29    if { [target_info gdb_protocol] == "remote" } then {
30	continue
31    }
32}
33
34standard_testfile .c
35set executable1 ${testfile}1
36set executable2 ${testfile}2
37set binfile1 ${binfile}1
38set binfile2 ${binfile}2
39set binfile2_test_msg OBJDIR/${subdir}/${executable2}
40
41# Use conditional compilation according to `BIN' as GDB remembers the source
42# file name of the breakpoint.
43
44set opts [list debug additional_flags=-fPIE ldflags=-pie]
45if {[build_executable ${testfile}.exp $executable1 $srcfile [concat $opts {additional_flags=-DBIN=1}]] == -1
46    || [build_executable ${testfile}.exp $executable2 $srcfile [concat $opts {additional_flags=-DBIN=2}]] == -1} {
47    return -1
48}
49
50clean_restart ${executable1}
51
52gdb_test_no_output "set args ${binfile2}" "set args ${binfile2_test_msg}"
53
54if ![runto_main] {
55    return -1
56}
57
58# Do not stop on `main' after re-exec.
59delete_breakpoints
60
61gdb_breakpoint "pie_execl_marker"
62gdb_test "info breakpoints" ".*" ""
63
64set addr1 ""
65set test "pie_execl_marker address first"
66gdb_test_multiple "p/x &pie_execl_marker" $test {
67    -re " = (0x\[0-9a-f\]+)\r\n$gdb_prompt $" {
68	set addr1 $expect_out(1,string)
69	pass $test
70    }
71}
72verbose -log "addr1 is $addr1"
73
74set test "continue"
75set matches_found 0
76gdb_test_multiple $test $test {
77    -re "Error in re-setting breakpoint" {
78	fail $test
79    }
80    -re "Cannot access memory" {
81	fail $test
82    }
83    -i "$inferior_spawn_id" -re "pie-execl: re-exec" {
84	# output from inferior
85        incr matches_found
86	if { $matches_found == 2 } {
87	    pass $test
88	} else {
89	    exp_continue
90	}
91    }
92    -i "$gdb_spawn_id"
93    -re "executing new program.*\r\nBreakpoint \[0-9\]+,\[^\r\n\]* pie_execl_marker .*\r\n$gdb_prompt $" {
94	# output from gdb
95        incr matches_found
96	if { $matches_found == 2 } {
97	    pass $test
98	} else {
99	    exp_continue
100	}
101    }
102}
103
104gdb_test "info breakpoints" ".*" ""
105
106set addr2 ""
107set test "pie_execl_marker address second"
108gdb_test_multiple "p/x &pie_execl_marker" $test {
109    -re " = (0x\[0-9a-f\]+)\r\n$gdb_prompt $" {
110	set addr2 $expect_out(1,string)
111	pass $test
112    }
113}
114verbose -log "addr2 is $addr2"
115
116# Ensure we cannot get a false PASS and the inferior has really changed.
117set test "pie_execl_marker address has changed"
118if [string equal $addr1 $addr2] {
119    fail $test
120} else {
121    pass $test
122}
123