| /* Target-dependent code for X86-based targets. |
| |
| Copyright (C) 2018-2024 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 "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) |
| { |
| 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; |
| } |