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/* Self tests for disassembler for GDB, the GNU debugger.
Copyright (C) 2017-2022 Free Software Foundation, Inc.
This file is part of GDB.
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/>. */
#include "defs.h"
#include "disasm.h"
#include "gdbsupport/selftest.h"
#include "selftest-arch.h"
#include "gdbarch.h"
namespace selftests {
/* Test disassembly of one instruction. */
static void
print_one_insn_test (struct gdbarch *gdbarch)
{
size_t len = 0;
const gdb_byte *insn = NULL;
switch (gdbarch_bfd_arch_info (gdbarch)->arch)
{
case bfd_arch_bfin:
/* M3.L = 0xe117 */
static const gdb_byte bfin_insn[] = {0x17, 0xe1, 0xff, 0xff};
insn = bfin_insn;
len = sizeof (bfin_insn);
break;
case bfd_arch_arm:
/* mov r0, #0 */
static const gdb_byte arm_insn[] = {0x0, 0x0, 0xa0, 0xe3};
insn = arm_insn;
len = sizeof (arm_insn);
break;
case bfd_arch_ia64:
case bfd_arch_mep:
case bfd_arch_mips:
case bfd_arch_tic6x:
case bfd_arch_xtensa:
return;
case bfd_arch_s390:
/* nopr %r7 */
static const gdb_byte s390_insn[] = {0x07, 0x07};
insn = s390_insn;
len = sizeof (s390_insn);
break;
case bfd_arch_xstormy16:
/* nop */
static const gdb_byte xstormy16_insn[] = {0x0, 0x0};
insn = xstormy16_insn;
len = sizeof (xstormy16_insn);
break;
case bfd_arch_nios2:
case bfd_arch_score:
case bfd_arch_riscv:
/* nios2, riscv, and score need to know the current instruction
to select breakpoint instruction. Give the breakpoint
instruction kind explicitly. */
{
int bplen;
insn = gdbarch_sw_breakpoint_from_kind (gdbarch, 4, &bplen);
len = bplen;
}
break;
case bfd_arch_arc:
/* PR 21003 */
if (gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_arc_arc601)
return;
goto generic_case;
case bfd_arch_i386:
{
const struct bfd_arch_info *info = gdbarch_bfd_arch_info (gdbarch);
/* The disassembly tests will fail on x86-linux because
opcodes rejects an attempt to disassemble for an arch with
a 64-bit address size when bfd_vma is 32-bit. */
if (info->bits_per_address > sizeof (bfd_vma) * CHAR_BIT)
return;
}
/* fall through */
default:
generic_case:
{
/* Test disassemble breakpoint instruction. */
CORE_ADDR pc = 0;
int kind = gdbarch_breakpoint_kind_from_pc (gdbarch, &pc);
int bplen;
insn = gdbarch_sw_breakpoint_from_kind (gdbarch, kind, &bplen);
len = bplen;
break;
}
}
SELF_CHECK (len > 0);
/* Test gdb_disassembler for a given gdbarch by reading data from a
pre-allocated buffer. If you want to see the disassembled
instruction printed to gdb_stdout, use maint selftest -verbose. */
class gdb_disassembler_test : public gdb_disassembler
{
public:
explicit gdb_disassembler_test (struct gdbarch *gdbarch,
const gdb_byte *insn,
size_t len)
: gdb_disassembler (gdbarch,
(run_verbose () ? gdb_stdout : &null_stream),
gdb_disassembler_test::read_memory),
m_insn (insn), m_len (len)
{
}
int
print_insn (CORE_ADDR memaddr)
{
if (run_verbose ())
{
gdb_printf (stream (), "%s ",
gdbarch_bfd_arch_info (arch ())->arch_name);
}
int len = gdb_disassembler::print_insn (memaddr);
if (run_verbose ())
gdb_printf (stream (), "\n");
return len;
}
private:
/* A buffer contain one instruction. */
const gdb_byte *m_insn;
/* Length of the buffer. */
size_t m_len;
static int read_memory (bfd_vma memaddr, gdb_byte *myaddr,
unsigned int len, struct disassemble_info *info)
{
gdb_disassembler_test *self
= static_cast<gdb_disassembler_test *>(info->application_data);
/* The disassembler in opcodes may read more data than one
instruction. Supply infinite consecutive copies
of the same instruction. */
for (size_t i = 0; i < len; i++)
myaddr[i] = self->m_insn[(memaddr + i) % self->m_len];
return 0;
}
};
gdb_disassembler_test di (gdbarch, insn, len);
SELF_CHECK (di.print_insn (0) == len);
}
/* Test disassembly on memory error. */
static void
memory_error_test (struct gdbarch *gdbarch)
{
class gdb_disassembler_test : public gdb_disassembler
{
public:
gdb_disassembler_test (struct gdbarch *gdbarch)
: gdb_disassembler (gdbarch, &null_stream,
gdb_disassembler_test::read_memory)
{
}
static int read_memory (bfd_vma memaddr, gdb_byte *myaddr,
unsigned int len,
struct disassemble_info *info)
{
/* Always return an error. */
return -1;
}
};
if (gdbarch_bfd_arch_info (gdbarch)->arch == bfd_arch_i386)
{
const struct bfd_arch_info *info = gdbarch_bfd_arch_info (gdbarch);
/* This test will fail on x86-linux because opcodes rejects an
attempt to disassemble for an arch with a 64-bit address size
when bfd_vma is 32-bit. */
if (info->bits_per_address > sizeof (bfd_vma) * CHAR_BIT)
return;
}
gdb_disassembler_test di (gdbarch);
bool saw_memory_error = false;
try
{
di.print_insn (0);
}
catch (const gdb_exception_error &ex)
{
if (ex.error == MEMORY_ERROR)
saw_memory_error = true;
}
/* Expect MEMORY_ERROR. */
SELF_CHECK (saw_memory_error);
}
} // namespace selftests
void _initialize_disasm_selftests ();
void
_initialize_disasm_selftests ()
{
selftests::register_test_foreach_arch ("print_one_insn",
selftests::print_one_insn_test);
selftests::register_test_foreach_arch ("memory_error",
selftests::memory_error_test);
}
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