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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 "gdbsupport/common-defs.h"
#include "nat/x86-linux-tdesc.h"
#ifdef __x86_64__
#include "arch/amd64.h"
#endif
#include "arch/i386.h"
#include "gdbsupport/common-defs.h"
#include "nat/x86-linux.h"
#include "nat/x86-linux-dregs.h"
#include "nat/gdb_ptrace.h"
#include "nat/x86-xstate.h"
#include "nat/x86-linux-tdesc.h"
#include <cstdint>
#include <cstdlib>
#include <linux/uio.h>
#include <elf.h>
#include <sys/user.h>
#include <sys/user.h>
/* See nat/x86-linux-tdesc.h. */
const target_desc *
x86_linux_tdesc_for_tid (int tid, enum tribool *have_ptrace_getregset,
gdb::function_view<void (uint64_t)> xcr0_init_cb,
const char *error_msg, uint64_t *xcr0_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)
error ("%s", error_msg);
#elif HAVE_PTRACE_GETFPXREGS
if (have_ptrace_getfpxregs == -1)
{
elf_fpxregset_t fpxregs;
if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0)
{
have_ptrace_getfpxregs = 0;
*have_ptrace_getregset = 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)
{
*have_ptrace_getregset = TRIBOOL_FALSE;
*xcr0_storage = 0;
}
else
{
*have_ptrace_getregset = TRIBOOL_TRUE;
/* Get XCR0 from XSAVE extended state. */
*xcr0_storage = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET
/ sizeof (uint64_t))];
#ifdef __x86_64__
/* No MPX on x32. */
if (is_64bit && is_x32)
*xcr0_storage &= ~X86_XSTATE_MPX;
#endif /* __x86_64__ */
xcr0_init_cb (*xcr0_storage);
}
}
/* Check the native XCR0 only if PTRACE_GETREGSET is available. If
PTRACE_GETREGSET is not available then set xcr0_features_bits to
zero so that the "no-features" descriptions are returned by the
switches below. */
uint64_t xcr0_features_bits;
if (*have_ptrace_getregset == TRIBOOL_TRUE)
xcr0_features_bits = *xcr0_storage & X86_XSTATE_ALL_MASK;
else
xcr0_features_bits = 0;
#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);
gdb_assert_not_reached ("failed to return tdesc");
}
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