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- /* Target-dependent code for X86-based targets.
- Copyright (C) 2018-2022 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 "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. */
- bool
- 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;
- }
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