246 lines
7 KiB
Text
246 lines
7 KiB
Text
# Copyright 2014-2015 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# This file is part of the gdb testsuite
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standard_testfile
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if { [prepare_for_testing "failed to prepare" $testfile $srcfile] } {
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return -1
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}
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if ![runto main] {
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return -1
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}
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delete_breakpoints
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# Probe for hardware stepping.
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proc probe_target_hardware_step {} {
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global gdb_prompt
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set hw_step 0
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gdb_test_no_output "set debug target 1"
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set test "probe target hardware step"
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gdb_test_multiple "si" $test {
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-re "to_resume \\(\[^\r\n\]+, step, .*$gdb_prompt $" {
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set hw_step 1
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pass $test
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}
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-re "$gdb_prompt $" {
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pass $test
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}
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}
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gdb_test "set debug target 0" "->to_log_command.*\\).*"
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return $hw_step
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}
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# Get the bounds of a function, and write them to FUNC_LO (inclusive),
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# FUNC_HI (exclusive). Return true on success and false on failure.
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proc get_function_bounds {function func_lo func_hi} {
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global gdb_prompt
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global hex decimal
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upvar $func_lo lo
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upvar $func_hi hi
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set lo ""
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set size ""
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set test "get lo address of $function"
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gdb_test_multiple "disassemble $function" $test {
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-re "($hex) .*$hex <\\+($decimal)>:\[^\r\n\]+\r\nEnd of assembler dump\.\r\n$gdb_prompt $" {
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set lo $expect_out(1,string)
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set size $expect_out(2,string)
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pass $test
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}
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}
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if { $lo == "" || $size == "" } {
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return false
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}
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# Account for the size of the last instruction.
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set test "get hi address of $function"
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gdb_test_multiple "x/2i $function+$size" $test {
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-re ".*$hex <$function\\+$size>:\[^\r\n\]+\r\n\[ \]+($hex).*\.\r\n$gdb_prompt $" {
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set hi $expect_out(1,string)
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pass $test
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}
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}
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if { $hi == "" } {
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return false
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}
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# Remove unnecessary leading 0's (0x00000ADDR => 0xADDR) so we can
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# easily do matches. Disassemble includes leading zeros, while
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# x/i doesn't.
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regsub -all "0x0\+" $lo "0x" lo
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regsub -all "0x0\+" $hi "0x" hi
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return true
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}
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# Get the address where the thread is currently stopped.
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proc get_curr_insn {} {
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global gdb_prompt
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global hex
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set pc ""
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set test "get current insn"
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gdb_test_multiple "p /x \$pc" $test {
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-re " = ($hex)\r\n$gdb_prompt $" {
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set pc $expect_out(1,string)
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pass $test
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}
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}
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return $pc
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}
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# Get the address of where a single-step should land.
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proc get_next_insn {} {
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global gdb_prompt
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global hex
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set next ""
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set test "get next insn"
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gdb_test_multiple "x/2i \$pc" $test {
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-re "$hex .*:\[^\r\n\]+\r\n\[ \]+($hex).*\.\r\n$gdb_prompt $" {
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set next $expect_out(1,string)
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pass $test
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}
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}
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return $next
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}
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set hw_step [probe_target_hardware_step]
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if ![get_function_bounds "main" main_lo main_hi] {
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# Can't do the following tests if main's bounds are unknown.
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return -1
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}
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# Manually create a read-only memory region that covers 'main'.
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gdb_test_no_output "mem $main_lo $main_hi ro" \
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"create read-only mem region covering main"
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# So that we don't fail inserting breakpoints on addresses outside
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# main, like the internal event breakpoints.
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gdb_test_no_output "set mem inaccessible-by-default off"
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# So we get an immediate warning/error without needing to resume the
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# target.
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gdb_test_no_output "set breakpoint always-inserted on"
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# Disable the automatic fallback to HW breakpoints. We want a
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# software breakpoint to be attempted, and to fail.
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gdb_test_no_output "set breakpoint auto-hw off"
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# Confirm manual writes to the read-only memory region fail.
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gdb_test "p /x *(char *) $main_lo = 1" \
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"Cannot access memory at address $main_lo" \
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"writing to read-only memory fails"
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# Ensure that inserting a software breakpoint in a known-read-only
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# region fails.
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gdb_test "break *$main_lo" \
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"Cannot insert breakpoint .*Cannot set software breakpoint at read-only address $main_lo.*" \
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"inserting software breakpoint in read-only memory fails"
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delete_breakpoints
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set supports_hbreak 0
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set test "probe hbreak support"
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gdb_test_multiple "hbreak *$main_lo" $test {
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-re "You may have requested too many.*$gdb_prompt $" {
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pass "$test (no support)"
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}
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-re "No hardware breakpoint support.*$gdb_prompt $" {
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pass "$test (no support)"
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}
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-re "$gdb_prompt $" {
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pass "$test (support)"
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set supports_hbreak 1
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}
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}
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delete_breakpoints
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# Check that the "auto-hw on/off" setting affects single-step
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# breakpoints as expected, by stepping through the read-only region.
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# If the target does hardware stepping, we won't exercise that aspect,
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# but we should be able to step through the region without seeing the
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# hardware breakpoint or read-only address errors.
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proc test_single_step { always_inserted auto_hw } {
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global gdb_prompt
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global decimal
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global supports_hbreak
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global hw_step
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gdb_test_no_output "set breakpoint always-inserted $always_inserted"
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gdb_test_no_output "set breakpoint auto-hw $auto_hw"
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# Get the address of the current instruction so we know where SI is
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# starting from.
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set curr_insn [get_curr_insn]
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# Get the address of the next instruction so we know where SI should
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# land.
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set next_insn [get_next_insn]
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set test "step in ro region"
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gdb_test_multiple "si" $test {
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-re "Could not insert hardware breakpoints.*$gdb_prompt $" {
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gdb_assert {!$hw_step && $auto_hw == "on" && !$supports_hbreak} \
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"$test (cannot insert hw break)"
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}
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-re "Cannot set software breakpoint at read-only address $next_insn.*$gdb_prompt $" {
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gdb_assert {!$hw_step && $auto_hw == "off"} \
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"$test (cannot insert sw break)"
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}
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-re "^si\r\nNote: automatically using hardware breakpoints for read-only addresses\.\r\n${decimal}\[ \t\]+i = 0;\r\n$gdb_prompt $" {
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gdb_assert {!$hw_step && $auto_hw == "on" && $supports_hbreak} \
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"$test (auto-hw)"
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}
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-re "^si\r\n${decimal}\[ \t\]+i = 0;\r\n$gdb_prompt $" {
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gdb_assert {$hw_step || ($auto_hw == "on" && $supports_hbreak)} \
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"$test (no error)"
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}
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}
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gdb_test "maint info breakpoints 0" \
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"No breakpoint or watchpoint matching '0'\." \
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"single-step breakpoint is not left behind"
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# Confirm the thread really advanced.
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if {$hw_step || ($auto_hw == "on" && $supports_hbreak)} {
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gdb_test "p /x \$pc" " = $next_insn" "thread advanced"
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} else {
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gdb_test "p /x \$pc" " = $curr_insn" "thread did not advance"
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}
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}
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foreach always_inserted {"off" "on"} {
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foreach auto_hw {"off" "on"} {
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with_test_prefix "always-inserted $always_inserted: auto-hw $auto_hw" {
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test_single_step $always_inserted $auto_hw
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}
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}
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}
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