mirror of
https://sourceware.org/git/binutils-gdb.git
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369 lines
12 KiB
Plaintext
369 lines
12 KiB
Plaintext
# Copyright 2015-2020 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 testsuite is to test examining memory backward by specifying a negative
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# number in the 'x' command.
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standard_testfile
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if { [prepare_for_testing "failed to prepare for examine-backward" \
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${testfile} ${srcfile}] } {
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return -1
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}
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if ![runto_main] {
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untested "could not run to main"
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return -1
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}
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proc get_first_mapped_address {} {
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global gdb_prompt
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set addr "0"
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gdb_test_multiple "info proc mappings" "info proc mappings" {
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-re "objfile\[\r\n\t \]+(0x\[0-9a-fA-F\]+).*\[\r\n\]*$gdb_prompt $" {
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set addr $expect_out(1,string)
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}
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-re "$gdb_prompt $" {
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unsupported "current target does not support 'info proc mappings'"
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}
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}
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return ${addr}
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}
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with_test_prefix "invalid format" {
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gdb_test "x/- 10xb main" "Invalid number \"10xb\"\." \
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"a whitespace after a leading hyphen"
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gdb_test "x/--10xb main" "Invalid number \"10xb\"\." \
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"double hyphen"
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gdb_test "x/-a10xb main" "Invalid number \"10xb\"\." \
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"an alphabet after a leading hyphen"
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gdb_test_no_output "x/-0i main" "zero with backward disassemble"
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gdb_test_no_output "x/-0sh main" "zero with backward examine string"
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}
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with_test_prefix "memory page boundary" {
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set boundary [get_first_mapped_address]
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if {![is_address_zero_readable] && $boundary != 0} {
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gdb_test_no_output "set print elements 0"
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gdb_test_sequence "x/3s ${boundary}" "take 3 strings forward" {
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"0x"
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"0x"
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"0x"
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}
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gdb_test_sequence "x/-4s" "take 4 strings backward" {
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"Cannot access memory at address 0x"
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"0x"
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"0x"
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"0x"
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}
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gdb_test_sequence "x/3s ${boundary}" "take 3 strings forward again" {
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"0x"
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"0x"
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"0x"
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}
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gdb_test_sequence "x/-3s" "take 3 strings backward" {
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"Cannot access memory at address 0x"
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"0x"
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"0x"
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"0x"
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}
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}
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}
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with_test_prefix "address zero boundary" {
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global gdb_prompt
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set address_zero "0x0"
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set byte "\t0x\[0-9a-f\]+"
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set test "examine 3 bytes forward from ${address_zero}"
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gdb_test_multiple "x/3xb ${address_zero}" "$test" {
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-re "0x\[0-9a-f\]*0.*:${byte}${byte}${byte}\[\r\n\]*$gdb_prompt $" {
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pass $test
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}
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-re "0x\[0-9a-f\]*0.*:\tCannot access memory at address 0x\[0-9a-f\]*0\[\r\n\]*$gdb_prompt $" {
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# If we failed to read address 0 then this is fine, so
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# long as we're not expecting to be able to read from
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# address 0.
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if {![is_address_zero_readable]} {
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# The next test assumes that the last address examined
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# would be 0x2. As we just failed to read address 0x0
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# things are going to go wrong unless we now tell GDB
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# to examine address 0x2. We assume here that if we
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# can't read 0x0 we can't read 0x2 either.
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gdb_test "x/3xb 0x2" "Cannot access memory at address 0x\[0-9a-f\]*2" \
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"set last examined address to 0x2"
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pass $test
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} else {
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fail $test
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}
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}
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}
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set test "examine 6 bytes backward"
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gdb_test_multiple "x/-6x" "$test" {
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-re "0x\[0-9a-f\]+fd.*:${byte}${byte}${byte}${byte}${byte}${byte}.*\[\r\n\]*$gdb_prompt $" {
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pass $test
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}
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-re "0x\[0-9a-f\]+fd.*:\tCannot access memory at address 0x\[0-9a-f\]+fd.*\[\r\n\]*$gdb_prompt $" {
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# We may, or may not have managed to read from address 0x0
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# in the previous test, however, being able to read 0x0 is
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# no guarantee that we can read from the other end of the
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# address space. If we get an error about trying to read
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# from the expected address then we count that as a pass,
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# GDB did try to read the correct location, and this test
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# is (mostly) about does GDB calculate the correct address
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# when wrapping around.
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pass $test
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}
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}
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set test "examine 3 bytes backward from ${address_zero}"
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gdb_test_multiple "x/-3x ${address_zero}" "$test" {
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-re "0x\[0-9a-f\]+fd.*:${byte}${byte}${byte}.*\[\r\n\]*$gdb_prompt $" {
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pass $test
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}
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-re "0x\[0-9a-f\]+fd.*:\tCannot access memory at address 0x\[0-9a-f\]+fd.*\[\r\n\]*$gdb_prompt $" {
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# See previous test for why this is a pass.
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pass $test
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}
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}
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}
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gdb_test_no_output "set charset ASCII"
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with_test_prefix "char-width=1, print-max=20" {
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gdb_test_no_output "set print elements 20"
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gdb_test_sequence "x/6s &TestStrings" "take 6 strings forward" {
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"\"ABCDEFGHIJKLMNOPQRST\"\.\.\."
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"\"UVWXYZ\""
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"\"\""
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"\"\""
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"\"[^\"]+\""
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"\"01234567890123456789\"\.\.\."
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}
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gdb_test "x/-1xb" "0x39" "take 1 char backward"
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gdb_test_sequence "x/-6s" "take 6 strings backward" {
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"\"ABCDEFGHIJKLMNOPQRST\"\.\.\."
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"\"UVWXYZ\""
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"\"\""
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"\"\""
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"\"[^\"]+\""
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"\"01234567890123456789\"\.\.\."
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}
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gdb_test_sequence "x/6s &TestStrings" "take 6 strings forward again" {
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"\"ABCDEFGHIJKLMNOPQRST\"\.\.\."
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"\"UVWXYZ\""
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"\"\""
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"\"\""
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"\"[^\"]+\""
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"\"01234567890123456789\"\.\.\."
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}
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gdb_test "x/-xb" "0x39" "take 1 char backward again"
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gdb_test "x/-s" "\"01234567890123456789\"\.\.\." \
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"take 1 string backward (1/6)"
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gdb_test "x/-s" "\".+\"" \
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"take 1 string backward (2/6)"
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gdb_test "x/-s" "\"\"" \
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"take 1 string backward (3/6)"
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gdb_test "x/-s" "\"\"" \
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"take 1 string backward (4/6)"
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gdb_test "x/-s" "\"GHIJKLMNOPQRSTUVWXYZ\"" \
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"take 1 string backward (5/6)"
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gdb_test "x/-s" "\"ABCDEFGHIJKLMNOPQRST\"\.\.\." \
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"take 1 string backward (6/6)"
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}
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with_test_prefix "char-width=2, print-max=20" {
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gdb_test_no_output "set print elements 20"
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gdb_test_sequence "x/6sh &TestStringsH" "take 6 strings forward" {
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"u\"ABCDEFGHIJKLMNOPQRST\"\.\.\."
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"u\"UVWXYZ\""
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"u\"\""
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"u\"\""
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"u\"[^\"]+\""
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"u\"01234567890123456789\"\.\.\."
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}
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gdb_test "x/-1xh" "0x0039" "take 1 char backward"
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gdb_test_sequence "x/-6sh" "take 6 strings backward" {
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"u\"ABCDEFGHIJKLMNOPQRST\"\.\.\."
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"u\"UVWXYZ\""
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"u\"\""
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"u\"\""
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"u\"[^\"]+\""
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"u\"01234567890123456789\"\.\.\."
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}
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gdb_test_sequence "x/6sh &TestStringsH" "take 6 strings forward again" {
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"u\"ABCDEFGHIJKLMNOPQRST\"\.\.\."
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"u\"UVWXYZ\""
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"u\"\""
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"u\"\""
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"u\"[^\"]+\""
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"u\"01234567890123456789\"\.\.\."
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}
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gdb_test "x/-xh" "0x0039" "take 1 char backward again"
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gdb_test "x/-sh" "u\"01234567890123456789\"\.\.\." \
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"take 1 string backward (1/6)"
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gdb_test "x/-sh" "u\".+\"" \
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"take 1 string backward (2/6)"
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gdb_test "x/-sh" "u\"\"" \
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"take 1 string backward (3/6)"
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gdb_test "x/-sh" "u\"\"" \
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"take 1 string backward (4/6)"
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gdb_test "x/-sh" "u\"GHIJKLMNOPQRSTUVWXYZ\"" \
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"take 1 string backward (5/6)"
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gdb_test "x/-sh" "u\"ABCDEFGHIJKLMNOPQRST\"\.\.\." \
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"take 1 string backward (6/6)"
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}
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with_test_prefix "char-width=4, print-max=20" {
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gdb_test_no_output "set print elements 20"
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gdb_test_sequence "x/6sw &TestStringsW" "take 6 strings forward" {
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"U\"ABCDEFGHIJKLMNOPQRST\"\.\.\."
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"U\"UVWXYZ\""
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"U\"\""
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"U\"\""
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"U\"[^\"]+\""
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"U\"01234567890123456789\"\.\.\."
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}
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gdb_test "x/-1xw" "0x00000039" "take 1 char backward"
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gdb_test_sequence "x/-6sw" "take 6 strings backward" {
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"U\"ABCDEFGHIJKLMNOPQRST\"\.\.\."
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"U\"UVWXYZ\""
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"U\"\""
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"U\"\""
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"U\"[^\"]+\""
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"U\"01234567890123456789\"\.\.\."
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}
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gdb_test_sequence "x/6sw &TestStringsW" "take 6 strings forward again" {
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"U\"ABCDEFGHIJKLMNOPQRST\"\.\.\."
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"U\"UVWXYZ\""
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"U\"\""
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"U\"\""
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"U\"[^\"]+\""
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"U\"01234567890123456789\"\.\.\."
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}
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gdb_test "x/-xw" "0x00000039" "take 1 char backward again"
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gdb_test "x/-sw" "U\"01234567890123456789\"\.\.\." \
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"take 1 string backward (1/6)"
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gdb_test "x/-sw" "U\".+\"" \
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"take 1 string backward (2/6)"
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gdb_test "x/-sw" "U\"\"" \
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"take 1 string backward (3/6)"
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gdb_test "x/-sw" "U\"\"" \
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"take 1 string backward (4/6)"
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gdb_test "x/-sw" "U\"GHIJKLMNOPQRSTUVWXYZ\"" \
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"take 1 string backward (5/6)"
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gdb_test "x/-sw" "U\"ABCDEFGHIJKLMNOPQRST\"\.\.\." \
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"take 1 string backward (6/6)"
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}
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with_test_prefix "char-width=2, print-max=0" {
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gdb_test_no_output "set print elements 0"
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gdb_test_sequence "x/6sh &TestStringsH" "take 6 strings forward" {
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"u\"ABCDEFGHIJKLMNOPQRSTUVWXYZ\""
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"u\"\""
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"u\"\""
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"u\"\\\\x307b\\\\x3052\\\\x307b\\\\x3052\""
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"u\"012345678901234567890123456789\""
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"u\"!!!!!!\""
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}
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gdb_test "x/-4xh" "0x0021\[\t \]+0x0021\[\t \]+0x0021\[\t \]+0x0000" \
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"take 4 characters backward"
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gdb_test_sequence "x/-6sh" "take 6 strings backward" {
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"u\"ABCDEFGHIJKLMNOPQRSTUVWXYZ\""
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"u\"\""
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"u\"\""
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"u\"[^\"]+\""
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"u\"012345678901234567890123456789\""
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"u\"!!!!!!\""
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}
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gdb_test_sequence "x/6sh &TestStringsH" "take 6 strings forward again" {
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"u\"ABCDEFGHIJKLMNOPQRSTUVWXYZ\""
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"u\"\""
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"u\"\""
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"u\"\\\\x307b\\\\x3052\\\\x307b\\\\x3052\""
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"u\"012345678901234567890123456789\""
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"u\"!!!!!!\""
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}
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gdb_test "x/-xh" "0x0000" "take 1 char backward"
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gdb_test "x/-sh" "u\"!!!!!!\"" \
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"take 1 string backward (1/6)"
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gdb_test "x/-sh" "u\"012345678901234567890123456789\"" \
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"take 1 string backward (2/6)"
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gdb_test "x/-sh" "u\".+\"" \
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"take 1 string backward (3/6)"
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gdb_test "x/-sh" "u\"\"" \
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"take 1 string backward (4/6)"
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gdb_test "x/-sh" "u\"\"" \
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"take 1 string backward (5/6)"
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gdb_test "x/-sh" "u\"ABCDEFGHIJKLMNOPQRSTUVWXYZ\"" \
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"take 1 string backward (6/6)"
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}
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with_test_prefix "char-width=1, print-max=4" {
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gdb_test_no_output "set print elements 4"
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gdb_test_sequence "x/9s &TestStrings" "take 9 strings forward" {
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"\"ABCD\"\.\.\."
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"\"EFGH\"\.\.\."
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"\"IJKL\"\.\.\."
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"\"MNOP\"\.\.\."
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"\"QRST\"\.\.\."
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"\"UVWX\"\.\.\."
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"\"YZ\""
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"\"\""
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"\"\""
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}
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gdb_test "x/-xb" "0x00" "take 1 byte backward"
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gdb_test_sequence "x/-4s" "take 4 strings backward (1/2)" {
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"\"TUVW\"\.\.\."
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"\"XYZ\""
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"\"\""
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"\"\""
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}
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gdb_test_sequence "x/-4s" "take 4 strings backward (2/2)" {
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"\"CDEF\"\.\.\."
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"\"GHIJ\"\.\.\."
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"\"KLMN\"\.\.\."
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"\"OPQR\"\.\.\."
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}
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}
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with_test_prefix "backward disassemble general" {
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set length_to_examine {1 2 3 4 10}
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set disassmbly {}
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gdb_test "x/i main" "0x\[0-9a-fA-F\]+ <main>:\t.*" \
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"move the current position to main (x/i)"
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gdb_test "x/-i" "0x\[0-9a-fA-F\]+ <main>:\t.*" \
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"move the current position to main (x/-i)"
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for {set i 0} {$i < [llength $length_to_examine]} {incr i} {
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set len [lindex $length_to_examine $i]
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set instructions [capture_command_output "x/${len}i" ""]
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lappend disassmbly $instructions
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}
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for {set i 0} {$i < [llength $length_to_examine]} {incr i} {
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set idx [expr [llength $length_to_examine] - $i - 1]
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set len [lindex $length_to_examine $idx]
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set actual [capture_command_output "x/-${len}i" ""]
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set expected [lindex $disassmbly $idx]
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if {$actual == $expected} {
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pass "inst:$idx"
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} else {
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fail "inst:$idx"
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}
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}
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}
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