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/* 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 */
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