2017-01-01 07:50:51 +01:00
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# Copyright 2015-2017 Free Software Foundation, Inc.
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Add negative repeat count to 'x' command
This change adds support for specifying a negative repeat count to
all the formats of the 'x' command to examine memory backward.
A new testcase 'examine-backward' is added to cover this new feature.
Here's the example output from the new feature:
<format 'i'>
(gdb) bt
#0 Func1 (n=42, p=0x40432e "hogehoge") at main.cpp:5
#1 0x00000000004041fa in main (argc=1, argv=0x7fffffffdff8) at main.cpp:19
(gdb) x/-4i 0x4041fa
0x4041e5 <main(int, char**)+11>: mov %rsi,-0x10(%rbp)
0x4041e9 <main(int, char**)+15>: lea 0x13e(%rip),%rsi
0x4041f0 <main(int, char**)+22>: mov $0x2a,%edi
0x4041f5 <main(int, char**)+27>: callq 0x404147
<format 'x'>
(gdb) x/-4xw 0x404200
0x4041f0 <main(int, char**)+22>: 0x00002abf 0xff4de800 0x76e8ffff 0xb8ffffff
(gdb) x/-4
0x4041e0 <main(int, char**)+6>: 0x7d8910ec 0x758948fc 0x358d48f0 0x0000013e
gdb/ChangeLog:
* NEWS: Mention that GDB now supports a negative repeat count in
the 'x' command.
* printcmd.c (decode_format): Allow '-' in the parameter
"string_ptr" to accept a negative repeat count.
(find_instruction_backward): New function.
(read_memory_backward): New function.
(integer_is_zero): New function.
(find_string_backward): New function.
(do_examine): Use new functions to examine memory backward.
(_initialize_printcmd): Mention that 'x' command supports a negative
repeat count.
gdb/doc/ChangeLog:
* gdb.texinfo (Examining Memory): Document negative repeat
count in the 'x' command.
gdb/testsuite/ChangeLog:
* gdb.base/examine-backward.c: New file.
* gdb.base/examine-backward.exp: New file.
2016-06-10 07:47:42 +02:00
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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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2016-12-01 21:40:05 +01:00
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unsupported "current target does not support 'info proc mappings'"
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Add negative repeat count to 'x' command
This change adds support for specifying a negative repeat count to
all the formats of the 'x' command to examine memory backward.
A new testcase 'examine-backward' is added to cover this new feature.
Here's the example output from the new feature:
<format 'i'>
(gdb) bt
#0 Func1 (n=42, p=0x40432e "hogehoge") at main.cpp:5
#1 0x00000000004041fa in main (argc=1, argv=0x7fffffffdff8) at main.cpp:19
(gdb) x/-4i 0x4041fa
0x4041e5 <main(int, char**)+11>: mov %rsi,-0x10(%rbp)
0x4041e9 <main(int, char**)+15>: lea 0x13e(%rip),%rsi
0x4041f0 <main(int, char**)+22>: mov $0x2a,%edi
0x4041f5 <main(int, char**)+27>: callq 0x404147
<format 'x'>
(gdb) x/-4xw 0x404200
0x4041f0 <main(int, char**)+22>: 0x00002abf 0xff4de800 0x76e8ffff 0xb8ffffff
(gdb) x/-4
0x4041e0 <main(int, char**)+6>: 0x7d8910ec 0x758948fc 0x358d48f0 0x0000013e
gdb/ChangeLog:
* NEWS: Mention that GDB now supports a negative repeat count in
the 'x' command.
* printcmd.c (decode_format): Allow '-' in the parameter
"string_ptr" to accept a negative repeat count.
(find_instruction_backward): New function.
(read_memory_backward): New function.
(integer_is_zero): New function.
(find_string_backward): New function.
(do_examine): Use new functions to examine memory backward.
(_initialize_printcmd): Mention that 'x' command supports a negative
repeat count.
gdb/doc/ChangeLog:
* gdb.texinfo (Examining Memory): Document negative repeat
count in the 'x' command.
gdb/testsuite/ChangeLog:
* gdb.base/examine-backward.c: New file.
* gdb.base/examine-backward.exp: New file.
2016-06-10 07:47:42 +02:00
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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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if {[is_address_zero_readable]} {
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set address_zero "0x0"
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set byte "\t0x\[0-9a-f\]+"
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gdb_test "x/3xb ${address_zero}" \
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"0x\[0-9a-f\]+00.*:${byte}${byte}${byte}" \
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"examine 3 bytes forward from ${address_zero}"
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gdb_test "x/-6x" \
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"0x\[0-9a-f\]+fd.*:${byte}${byte}${byte}${byte}${byte}${byte}" \
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"examine 6 bytes backward"
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gdb_test "x/-3x ${address_zero}" \
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"0x\[0-9a-f\]+fd.*:${byte}${byte}${byte}" \
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"examine 3 bytes backward from ${address_zero}"
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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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|
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gdb_test "x/-sh" "u\"012345678901234567890123456789\"" \
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"take 1 string backward (2/6)"
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|
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gdb_test "x/-sh" "u\".+\"" \
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"take 1 string backward (3/6)"
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|
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|
|
gdb_test "x/-sh" "u\"\"" \
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|
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|
|
"take 1 string backward (4/6)"
|
|
|
|
|
gdb_test "x/-sh" "u\"\"" \
|
|
|
|
|
"take 1 string backward (5/6)"
|
|
|
|
|
gdb_test "x/-sh" "u\"ABCDEFGHIJKLMNOPQRSTUVWXYZ\"" \
|
|
|
|
|
"take 1 string backward (6/6)"
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
with_test_prefix "char-width=1, print-max=4" {
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|
|
|
|
gdb_test_no_output "set print elements 4"
|
|
|
|
|
gdb_test_sequence "x/9s &TestStrings" "take 9 strings forward" {
|
|
|
|
|
"\"ABCD\"\.\.\."
|
|
|
|
|
"\"EFGH\"\.\.\."
|
|
|
|
|
"\"IJKL\"\.\.\."
|
|
|
|
|
"\"MNOP\"\.\.\."
|
|
|
|
|
"\"QRST\"\.\.\."
|
|
|
|
|
"\"UVWX\"\.\.\."
|
|
|
|
|
"\"YZ\""
|
|
|
|
|
"\"\""
|
|
|
|
|
"\"\""
|
|
|
|
|
}
|
|
|
|
|
gdb_test "x/-xb" "0x00" "take 1 byte backward"
|
|
|
|
|
gdb_test_sequence "x/-4s" "take 4 strings backward (1/2)" {
|
|
|
|
|
"\"TUVW\"\.\.\."
|
|
|
|
|
"\"XYZ\""
|
|
|
|
|
"\"\""
|
|
|
|
|
"\"\""
|
|
|
|
|
}
|
|
|
|
|
gdb_test_sequence "x/-4s" "take 4 strings backward (2/2)" {
|
|
|
|
|
"\"CDEF\"\.\.\."
|
|
|
|
|
"\"GHIJ\"\.\.\."
|
|
|
|
|
"\"KLMN\"\.\.\."
|
|
|
|
|
"\"OPQR\"\.\.\."
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
with_test_prefix "backward disassemble general" {
|
|
|
|
|
set length_to_examine {1 2 3 4 10}
|
|
|
|
|
set disassmbly {}
|
|
|
|
|
|
|
|
|
|
gdb_test "x/i main" "0x\[0-9a-fA-F\]+ <main>:\t.*" \
|
|
|
|
|
"move the current position to main (x/i)"
|
|
|
|
|
gdb_test "x/-i" "0x\[0-9a-fA-F\]+ <main>:\t.*" \
|
|
|
|
|
"move the current position to main (x/-i)"
|
|
|
|
|
for {set i 0} {$i < [llength $length_to_examine]} {incr i} {
|
|
|
|
|
set len [lindex $length_to_examine $i]
|
|
|
|
|
set instructions [capture_command_output "x/${len}i" ""]
|
|
|
|
|
lappend disassmbly $instructions
|
|
|
|
|
}
|
|
|
|
|
for {set i 0} {$i < [llength $length_to_examine]} {incr i} {
|
|
|
|
|
set idx [expr [llength $length_to_examine] - $i - 1]
|
|
|
|
|
set len [lindex $length_to_examine $idx]
|
|
|
|
|
set actual [capture_command_output "x/-${len}i" ""]
|
|
|
|
|
set expected [lindex $disassmbly $idx]
|
|
|
|
|
if {$actual == $expected} {
|
|
|
|
|
pass "inst:$idx"
|
|
|
|
|
} else {
|
|
|
|
|
fail "inst:$idx"
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
