gdb/testsuite/gdb.guile/scm-disasm.exp

# Copyright 2014-2020 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/>.

load_lib gdb-guile.exp

standard_testfile

if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] } {
    return
}

# Skip all tests if Guile scripting is not enabled.
if { [skip_guile_tests] } { continue }

if ![gdb_guile_runto_main] {
   return
}

# Disassemble one instruction at pc and verify the result.

proc test_disassemble_1 { name address extra_args } {
    with_test_prefix $name {
	gdb_scm_test_silent_cmd "guile (define insn-list (arch-disassemble arch $address $extra_args #:size 1 #:count 1))" \
	    "disassemble"

	gdb_test "guile (print (length insn-list))" \
	    "= 1" "test number of instructions"
	gdb_scm_test_silent_cmd "guile (define insn (car insn-list))" \
	    "get instruction"

	# Verify all the fields are present.
	gdb_test "guile (print (->bool (assq-ref insn 'address)))" \
	    "= #t" "test key address"
	gdb_test "guile (print (->bool (assq-ref insn 'asm)))" \
	    "= #t" "test key asm"
	gdb_test "guile (print (->bool (assq-ref insn 'length)))" \
	    "= #t" "test key length"

	# Verify the correct address is used.
	gdb_test "guile (print (= $address (assq-ref insn 'address)))" \
	    "= #t" "verify correct address"
    }
}

gdb_scm_test_silent_cmd "guile (define frame (selected-frame))" "get frame"
gdb_scm_test_silent_cmd "guile (define arch (frame-arch frame))" "get arch"
gdb_scm_test_silent_cmd "guile (define pc (frame-pc frame))" "get pc"

gdb_test "guile (print (arch-disassemble arch pc #:size 0))" \
    "= \\(\\)" "disassemble, zero size"
gdb_test "guile (print (arch-disassemble arch pc #:count 0))" \
    "= \\(\\)" "disassemble, zero count"

gdb_scm_test_silent_cmd "guile (define insn-list1 (arch-disassemble arch pc #:size 1 #:count 1))" \
    "disassemble"
gdb_scm_test_silent_cmd "guile (define insn-list2 (arch-disassemble arch pc #:size 1))" \
    "disassemble, no count"
gdb_scm_test_silent_cmd "guile (define insn-list3 (arch-disassemble arch pc #:count 1))" \
    "disassemble, no end"
gdb_scm_test_silent_cmd "guile (define insn-list4 (arch-disassemble arch pc))" \
    "disassemble, no end no count"

gdb_test "guile (print (length insn-list1))" \
    "= 1" "test number of instructions 1"
gdb_test "guile (print (length insn-list2))" \
    "= 1" "test number of instructions 2"
gdb_test "guile (print (length insn-list3))" \
    "= 1" "test number of instructions 3"
gdb_test "guile (print (length insn-list4))" \
    "= 1" "test number of instructions 4"

test_disassemble_1 "basic" "pc" ""

if { ![is_address_zero_readable] } {
    # Negative test
    gdb_test "guile (arch-disassemble arch 0 #:size 1)" \
	"ERROR: Cannot access memory at address 0x.*" "test bad memory access"
}

# Test disassembly through a port.

gdb_scm_test_silent_cmd "guile (define mem (open-memory))" \
    "open memory port"

test_disassemble_1 "memory-port" "pc" "#:port mem"

gdb_scm_test_silent_cmd "guile (define insn-list-mem (arch-disassemble arch pc #:port mem #:size 1 #:count 1))" \
    "disassemble via memory port"

# Test memory error reading from port.

gdb_scm_test_silent_cmd "guile (define mem1 (open-memory #:start pc #:size 4))" \
    "open restricted range memory port"

# The x86 disassembler tries to be clever and will print "byte 0x42" if
# there is insufficient memory for the entire instruction.
# So we pass "#:count 5" to ensure the disassembler tries to read beyond
# the end of the memory range.
gdb_test "guile (arch-disassemble arch pc #:port mem1 #:count 5 #:offset pc)" \
    "ERROR: Cannot access memory at address 0x.*" \
    "test bad memory access from port"

# Test disassembly of a bytevector.

gdb_scm_test_silent_cmd "guile (use-modules (rnrs io ports))" \
    "import (rnrs io ports)"

# First fetch the length of the instruction at $pc.
gdb_scm_test_silent_cmd "guile (define insn-list-for-bv (arch-disassemble arch pc))" \
    "get insn for bytevector"
gdb_test_no_output "guile (define insn-length (assq-ref (car insn-list-for-bv) 'length))" \
    "get insn length for bytevector"

# Read the insn into a bytevector.
gdb_test_no_output "guile (define insn-bv (get-bytevector-n (open-memory #:start pc #:size insn-length) insn-length))" \
    "read insn into bytevector"

# Disassemble the bytevector.
gdb_scm_test_silent_cmd "guile (define insn-list-from-bv (arch-disassemble arch pc #:port (open-bytevector-input-port insn-bv) #:offset pc))" \
    "disassemble bytevector"

gdb_test "guile (print (equal? insn-list-for-bv insn-list-from-bv))" \
    "= #t" "verify bytevector disassembly"