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213516ef31
This commit is the result of running the gdb/copyright.py script, which automated the update of the copyright year range for all source files managed by the GDB project to be updated to include year 2023.
347 lines
9.3 KiB
C
347 lines
9.3 KiB
C
/* Self tests for disassembler for GDB, the GNU debugger.
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Copyright (C) 2017-2023 Free Software Foundation, Inc.
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This file is part of GDB.
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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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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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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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#include "defs.h"
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#include "disasm.h"
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#include "gdbsupport/selftest.h"
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#include "selftest-arch.h"
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#include "gdbarch.h"
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namespace selftests {
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/* Return a pointer to a buffer containing an instruction that can be
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disassembled for architecture GDBARCH. *LEN will be set to the length
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of the returned buffer.
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If there's no known instruction to disassemble for GDBARCH (because we
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haven't figured on out, not because no instructions exist) then nullptr
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is returned, and *LEN is set to 0. */
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static const gdb_byte *
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get_test_insn (struct gdbarch *gdbarch, size_t *len)
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{
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*len = 0;
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const gdb_byte *insn = nullptr;
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switch (gdbarch_bfd_arch_info (gdbarch)->arch)
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{
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case bfd_arch_bfin:
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/* M3.L = 0xe117 */
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static const gdb_byte bfin_insn[] = {0x17, 0xe1, 0xff, 0xff};
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insn = bfin_insn;
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*len = sizeof (bfin_insn);
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break;
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case bfd_arch_arm:
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/* mov r0, #0 */
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static const gdb_byte arm_insn[] = {0x0, 0x0, 0xa0, 0xe3};
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insn = arm_insn;
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*len = sizeof (arm_insn);
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break;
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case bfd_arch_ia64:
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/* We get:
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internal-error: gdbarch_sw_breakpoint_from_kind:
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Assertion `gdbarch->sw_breakpoint_from_kind != NULL' failed. */
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return insn;
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case bfd_arch_mep:
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/* Disassembles as '*unknown*' insn, then len self-check fails. */
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return insn;
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case bfd_arch_mips:
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if (gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_mips16)
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/* Disassembles insn, but len self-check fails. */
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return insn;
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goto generic_case;
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case bfd_arch_tic6x:
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/* Disassembles as '<undefined instruction 0x56454314>' insn, but len
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self-check passes, so let's allow it. */
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goto generic_case;
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case bfd_arch_xtensa:
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/* Disassembles insn, but len self-check fails. */
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return insn;
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case bfd_arch_or1k:
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/* Disassembles as '*unknown*' insn, but len self-check passes, so let's
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allow it. */
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goto generic_case;
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case bfd_arch_s390:
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/* nopr %r7 */
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static const gdb_byte s390_insn[] = {0x07, 0x07};
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insn = s390_insn;
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*len = sizeof (s390_insn);
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break;
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case bfd_arch_xstormy16:
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/* nop */
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static const gdb_byte xstormy16_insn[] = {0x0, 0x0};
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insn = xstormy16_insn;
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*len = sizeof (xstormy16_insn);
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break;
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case bfd_arch_nios2:
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case bfd_arch_score:
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case bfd_arch_riscv:
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/* nios2, riscv, and score need to know the current instruction
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to select breakpoint instruction. Give the breakpoint
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instruction kind explicitly. */
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{
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int bplen;
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insn = gdbarch_sw_breakpoint_from_kind (gdbarch, 4, &bplen);
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*len = bplen;
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}
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break;
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case bfd_arch_arc:
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/* PR 21003 */
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if (gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_arc_arc601)
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return insn;
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goto generic_case;
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case bfd_arch_z80:
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{
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int bplen;
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insn = gdbarch_sw_breakpoint_from_kind (gdbarch, 0x0008, &bplen);
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*len = bplen;
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}
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break;
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case bfd_arch_i386:
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{
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const struct bfd_arch_info *info = gdbarch_bfd_arch_info (gdbarch);
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/* The disassembly tests will fail on x86-linux because
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opcodes rejects an attempt to disassemble for an arch with
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a 64-bit address size when bfd_vma is 32-bit. */
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if (info->bits_per_address > sizeof (bfd_vma) * CHAR_BIT)
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return insn;
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}
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/* fall through */
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default:
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generic_case:
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{
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/* Test disassemble breakpoint instruction. */
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CORE_ADDR pc = 0;
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int kind;
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int bplen;
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struct gdbarch_info info;
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info.bfd_arch_info = gdbarch_bfd_arch_info (gdbarch);
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enum gdb_osabi it;
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bool found = false;
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for (it = GDB_OSABI_UNKNOWN; it != GDB_OSABI_INVALID;
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it = static_cast<enum gdb_osabi>(static_cast<int>(it) + 1))
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{
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if (it == GDB_OSABI_UNKNOWN)
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continue;
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info.osabi = it;
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if (it != GDB_OSABI_NONE)
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{
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if (!has_gdb_osabi_handler (info))
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/* Unsupported. Skip to prevent warnings like:
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A handler for the OS ABI <x> is not built into this
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configuration of GDB. Attempting to continue with the
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default <y> settings. */
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continue;
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}
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gdbarch = gdbarch_find_by_info (info);
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SELF_CHECK (gdbarch != NULL);
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try
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{
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kind = gdbarch_breakpoint_kind_from_pc (gdbarch, &pc);
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insn = gdbarch_sw_breakpoint_from_kind (gdbarch, kind, &bplen);
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}
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catch (...)
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{
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continue;
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}
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found = true;
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break;
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}
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/* Assert that we have found an instruction to disassemble. */
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SELF_CHECK (found);
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*len = bplen;
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break;
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}
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}
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SELF_CHECK (*len > 0);
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return insn;
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}
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/* Test disassembly of one instruction. */
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static void
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print_one_insn_test (struct gdbarch *gdbarch)
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{
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size_t len;
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const gdb_byte *insn = get_test_insn (gdbarch, &len);
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if (insn == nullptr)
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return;
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/* Test gdb_disassembler for a given gdbarch by reading data from a
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pre-allocated buffer. If you want to see the disassembled
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instruction printed to gdb_stdout, use maint selftest -verbose. */
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class gdb_disassembler_test : public gdb_disassembler
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{
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public:
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explicit gdb_disassembler_test (struct gdbarch *gdbarch,
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const gdb_byte *insn,
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size_t len)
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: gdb_disassembler (gdbarch,
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(run_verbose () ? gdb_stdlog : &null_stream),
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gdb_disassembler_test::read_memory),
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m_insn (insn), m_len (len)
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{
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}
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int
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print_insn (CORE_ADDR memaddr)
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{
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int len = gdb_disassembler::print_insn (memaddr);
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if (run_verbose ())
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debug_printf ("\n");
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return len;
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}
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private:
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/* A buffer contain one instruction. */
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const gdb_byte *m_insn;
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/* Length of the buffer. */
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size_t m_len;
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static int read_memory (bfd_vma memaddr, gdb_byte *myaddr,
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unsigned int len,
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struct disassemble_info *info) noexcept
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{
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gdb_disassembler_test *self
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= static_cast<gdb_disassembler_test *>(info->application_data);
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/* The disassembler in opcodes may read more data than one
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instruction. Supply infinite consecutive copies
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of the same instruction. */
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for (size_t i = 0; i < len; i++)
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myaddr[i] = self->m_insn[(memaddr + i) % self->m_len];
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return 0;
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}
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};
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gdb_disassembler_test di (gdbarch, insn, len);
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SELF_CHECK (di.print_insn (0) == len);
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}
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/* Test the gdb_buffered_insn_length function. */
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static void
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buffered_insn_length_test (struct gdbarch *gdbarch)
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{
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size_t buf_len;
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const gdb_byte *insn = get_test_insn (gdbarch, &buf_len);
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if (insn == nullptr)
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return;
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/* The tic6x architecture is VLIW. Disassembling requires that the
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entire instruction bundle be available. However, the buffer we got
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back from get_test_insn only contains a single instruction, which is
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just part of an instruction bundle. As a result, the disassemble will
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fail. To avoid this, skip tic6x tests now. */
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if (gdbarch_bfd_arch_info (gdbarch)->arch == bfd_arch_tic6x)
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return;
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CORE_ADDR insn_address = 0;
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int calculated_len = gdb_buffered_insn_length (gdbarch, insn, buf_len,
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insn_address);
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SELF_CHECK (calculated_len == buf_len);
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}
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/* Test disassembly on memory error. */
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static void
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memory_error_test (struct gdbarch *gdbarch)
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{
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class gdb_disassembler_test : public gdb_disassembler
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{
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public:
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gdb_disassembler_test (struct gdbarch *gdbarch)
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: gdb_disassembler (gdbarch, &null_stream,
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gdb_disassembler_test::read_memory)
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{
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}
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static int read_memory (bfd_vma memaddr, gdb_byte *myaddr,
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unsigned int len,
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struct disassemble_info *info) noexcept
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{
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/* Always return an error. */
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return -1;
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}
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};
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if (gdbarch_bfd_arch_info (gdbarch)->arch == bfd_arch_i386)
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{
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const struct bfd_arch_info *info = gdbarch_bfd_arch_info (gdbarch);
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/* This test will fail on x86-linux because opcodes rejects an
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attempt to disassemble for an arch with a 64-bit address size
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when bfd_vma is 32-bit. */
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if (info->bits_per_address > sizeof (bfd_vma) * CHAR_BIT)
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return;
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}
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gdb_disassembler_test di (gdbarch);
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bool saw_memory_error = false;
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try
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{
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di.print_insn (0);
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}
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catch (const gdb_exception_error &ex)
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{
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if (ex.error == MEMORY_ERROR)
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saw_memory_error = true;
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}
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/* Expect MEMORY_ERROR. */
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SELF_CHECK (saw_memory_error);
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}
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} // namespace selftests
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void _initialize_disasm_selftests ();
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void
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_initialize_disasm_selftests ()
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{
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selftests::register_test_foreach_arch ("print_one_insn",
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selftests::print_one_insn_test);
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selftests::register_test_foreach_arch ("memory_error",
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selftests::memory_error_test);
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selftests::register_test_foreach_arch ("buffered_insn_length",
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selftests::buffered_insn_length_test);
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}
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