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78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
/* Target-dependent code for X86-based targets.
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Copyright (C) 2018-2020 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 "x86-tdep.h"
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#include "symtab.h"
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/* Check whether NAME is included in NAMES[LO] (inclusive) to NAMES[HI]
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(exclusive). */
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static bool
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x86_is_thunk_register_name (const char *name, const char **names, int lo,
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int hi)
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{
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int reg;
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for (reg = lo; reg < hi; ++reg)
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if (strcmp (name, names[reg]) == 0)
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return true;
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return false;
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}
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/* See x86-tdep.h. */
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bool
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x86_in_indirect_branch_thunk (CORE_ADDR pc, const char **register_names,
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int lo, int hi)
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{
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struct bound_minimal_symbol bmfun = lookup_minimal_symbol_by_pc (pc);
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if (bmfun.minsym == nullptr)
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return false;
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const char *name = bmfun.minsym->linkage_name ();
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if (name == nullptr)
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return false;
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/* Check the indirect return thunk first. */
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if (strcmp (name, "__x86_return_thunk") == 0)
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return true;
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/* Then check a family of indirect call/jump thunks. */
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static const char thunk[] = "__x86_indirect_thunk";
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static const size_t length = sizeof (thunk) - 1;
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if (strncmp (name, thunk, length) != 0)
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return false;
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/* If that's the complete name, we're in the memory thunk. */
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name += length;
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if (*name == '\0')
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return true;
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/* Check for suffixes. */
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if (*name++ != '_')
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return false;
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if (x86_is_thunk_register_name (name, register_names, lo, hi))
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return true;
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return false;
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}
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