77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/* 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;
|
|
}
|