forked from Imagelibrary/binutils-gdb
fc14343205
GDB deprecated the commands "show/set mpx bound" in GDB 15.1, as Intel listed Intel(R) Memory Protection Extensions (MPX) as removed in 2019. MPX is also deprecated in gcc (since v9.1), the linux kernel (since v5.6) and glibc (since v2.35). Let's now remove MPX support in GDB completely. This includes the removal of: - MPX functionality including register support - deprecated mpx commands - i386 and amd64 implementation of the hooks report_signal_info and get_siginfo_type - tests - and pretty printer. We keep MPX register numbers to not break compatibility with old gdbservers. Approved-By: Felix Willgerodt <felix.willgerodt@intel.com>
126 lines
3.5 KiB
C
126 lines
3.5 KiB
C
/* Target description related code for GNU/Linux x86 (i386 and x86-64).
|
|
|
|
Copyright (C) 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 "nat/x86-linux-tdesc.h"
|
|
#ifdef __x86_64__
|
|
#include "arch/amd64.h"
|
|
#include "arch/amd64-linux-tdesc.h"
|
|
#endif
|
|
#include "arch/i386.h"
|
|
#include "arch/i386-linux-tdesc.h"
|
|
|
|
#include "nat/x86-linux.h"
|
|
#include "nat/gdb_ptrace.h"
|
|
#include "nat/x86-xstate.h"
|
|
#include "gdbsupport/x86-xstate.h"
|
|
|
|
#ifndef __x86_64__
|
|
#include <sys/procfs.h>
|
|
#include "nat/i386-linux.h"
|
|
#endif
|
|
|
|
#include <sys/uio.h>
|
|
#include <elf.h>
|
|
|
|
#ifndef IN_PROCESS_AGENT
|
|
|
|
/* See nat/x86-linux-tdesc.h. */
|
|
|
|
const target_desc *
|
|
x86_linux_tdesc_for_tid (int tid, uint64_t *xcr0_storage,
|
|
x86_xsave_layout *xsave_layout_storage)
|
|
{
|
|
#ifdef __x86_64__
|
|
x86_linux_arch_size arch_size = x86_linux_ptrace_get_arch_size (tid);
|
|
bool is_64bit = arch_size.is_64bit ();
|
|
bool is_x32 = arch_size.is_x32 ();
|
|
|
|
if (sizeof (void *) == 4 && is_64bit && !is_x32)
|
|
{
|
|
#ifdef GDBSERVER
|
|
error (_("Can't debug 64-bit process with 32-bit GDBserver"));
|
|
#else
|
|
error (_("Can't debug 64-bit process with 32-bit GDB"));
|
|
#endif
|
|
}
|
|
|
|
#elif HAVE_PTRACE_GETFPXREGS
|
|
if (have_ptrace_getfpxregs == TRIBOOL_UNKNOWN)
|
|
{
|
|
elf_fpxregset_t fpxregs;
|
|
|
|
if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0)
|
|
{
|
|
have_ptrace_getfpxregs = TRIBOOL_FALSE;
|
|
have_ptrace_getregset = TRIBOOL_FALSE;
|
|
}
|
|
else
|
|
have_ptrace_getfpxregs = TRIBOOL_TRUE;
|
|
}
|
|
|
|
if (have_ptrace_getfpxregs == TRIBOOL_FALSE)
|
|
return i386_linux_read_description (X86_XSTATE_X87_MASK);
|
|
#endif
|
|
|
|
if (have_ptrace_getregset == TRIBOOL_UNKNOWN)
|
|
{
|
|
uint64_t xstateregs[(X86_XSTATE_SSE_SIZE / sizeof (uint64_t))];
|
|
struct iovec iov;
|
|
|
|
iov.iov_base = xstateregs;
|
|
iov.iov_len = sizeof (xstateregs);
|
|
|
|
/* Check if PTRACE_GETREGSET works. */
|
|
if (ptrace (PTRACE_GETREGSET, tid,
|
|
(unsigned int) NT_X86_XSTATE, &iov) < 0)
|
|
{
|
|
/* Can't fetch the xcr0 value so pick a simple default. This
|
|
default has x87 and sse bits set. These bits are ignored for
|
|
amd64 and x32 targets, but are checked for on i386. Without
|
|
these bits being set we generate a completely empty tdesc for
|
|
i386 which will be rejected by GDB. */
|
|
have_ptrace_getregset = TRIBOOL_FALSE;
|
|
*xcr0_storage = X86_XSTATE_SSE_MASK;
|
|
}
|
|
else
|
|
{
|
|
have_ptrace_getregset = TRIBOOL_TRUE;
|
|
|
|
/* Get XCR0 from XSAVE extended state. */
|
|
*xcr0_storage = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET
|
|
/ sizeof (uint64_t))];
|
|
|
|
*xsave_layout_storage
|
|
= x86_fetch_xsave_layout (*xcr0_storage, x86_xsave_length ());
|
|
}
|
|
}
|
|
|
|
/* Use cached xcr0 value. */
|
|
uint64_t xcr0_features_bits = *xcr0_storage & X86_XSTATE_ALL_MASK;
|
|
|
|
#ifdef __x86_64__
|
|
if (is_64bit)
|
|
return amd64_linux_read_description (xcr0_features_bits, is_x32);
|
|
else
|
|
#endif
|
|
return i386_linux_read_description (xcr0_features_bits);
|
|
}
|
|
|
|
#endif /* !IN_PROCESS_AGENT */
|