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/* Target-dependent code for X86-based targets.
Copyright (C) 2018-2021 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
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 <>. */
#include "defs.h"
#include "x86-tdep.h"
#include "symtab.h"
/* Check whether NAME is included in NAMES[LO] (inclusive) to NAMES[HI]
(exclusive). */
static bool
x86_is_thunk_register_name (const char *name, const char * const *names,
int lo, int hi)
int reg;
for (reg = lo; reg < hi; ++reg)
if (strcmp (name, names[reg]) == 0)
return true;
return false;
/* See x86-tdep.h. */
x86_in_indirect_branch_thunk (CORE_ADDR pc, const char * const *register_names,
int lo, int hi)
struct bound_minimal_symbol bmfun = lookup_minimal_symbol_by_pc (pc);
if (bmfun.minsym == nullptr)
return false;
const char *name = bmfun.minsym->linkage_name ();
if (name == nullptr)
return false;
/* Check the indirect return thunk first. */
if (strcmp (name, "__x86_return_thunk") == 0)
return true;
/* Then check a family of indirect call/jump thunks. */
static const char thunk[] = "__x86_indirect_thunk";
static const size_t length = sizeof (thunk) - 1;
if (strncmp (name, thunk, length) != 0)
return false;
/* If that's the complete name, we're in the memory thunk. */
name += length;
if (*name == '\0')
return true;
/* Check for suffixes. */
if (*name++ != '_')
return false;
if (x86_is_thunk_register_name (name, register_names, lo, hi))
return true;
return false;