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binutils-gdb/gdb/gdbserver/linux-x86-tdesc.c
John Baldwin 1163a4b7a3 Support the fs_base and gs_base registers on i386.
As on amd64, these registers hold the base address of the fs and gs
segments, respectively.  For i386 these two registers are 32 bits.

gdb/ChangeLog:

	* amd64-fbsd-nat.c (amd64_fbsd_nat_target::read_description):
	Update calls to i386_target_description to add 'segments'
	parameter.
	* amd64-tdep.c (amd64_init_abi): Set tdep->fsbase_regnum.  Don't
	add segment base registers.
	* arch/i386.c (i386_create_target_description): Add 'segments'
	parameter to enable segment base registers.
	* arch/i386.h (i386_create_target_description): Likewise.
	* features/i386/32bit-segments.xml: New file.
	* features/i386/32bit-segments.c: Generate.
	* i386-fbsd-nat.c (i386_fbsd_nat_target::read_description): Update
	call to i386_target_description to add 'segments' parameter.
	* i386-fbsd-tdep.c (i386fbsd_core_read_description): Likewise.
	* i386-go32-tdep.c (i386_go32_init_abi): Likewise.
	* i386-linux-tdep.c (i386_linux_read_description): Likewise.
	* i386-tdep.c (i386_validate_tdesc_p): Add segment base registers
	if feature is present.
	(i386_gdbarch_init): Pass I386_NUM_REGS to set_gdbarch_num_regs.
	Add 'segments' parameter to call to i386_target_description.
	(i386_target_description): Add 'segments' parameter to enable
	segment base registers.
	(_initialize_i386_tdep) [GDB_SELF_TEST]: Add 'segments' parameter
	to call to i386_target_description.
	* i386-tdep.h (struct gdbarch_tdep): Add 'fsbase_regnum'.
	(enum i386_regnum): Add I386_FSBASE_REGNUM and I386_GSBASE_REGNUM.
	Define I386_NUM_REGS.
	(i386_target_description): Add 'segments' parameter to enable
	segment base registers.

gdb/gdbserver/ChangeLog:

	* linux-x86-tdesc.c (i386_linux_read_description): Update call to
	i386_create_target_description for 'segments' parameter.
	* lynx-i386-low.c (lynx_i386_arch_setup): Likewise.
	* nto-x86-low.c (nto_x86_arch_setup): Likewise.
	* win32-i386-low.c (i386_arch_setup): Likewise.
2019-03-12 13:39:02 -07:00

165 lines
3.8 KiB
C

/* GNU/Linux/x86-64 specific target description, for the remote server
for GDB.
Copyright (C) 2017-2019 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 "server.h"
#include "tdesc.h"
#include "linux-x86-tdesc.h"
#include "arch/i386.h"
#include "common/x86-xstate.h"
#ifdef __x86_64__
#include "arch/amd64.h"
#endif
#include "x86-tdesc.h"
/* Return the right x86_linux_tdesc index for a given XCR0. Return
X86_TDESC_LAST if can't find a match. */
static enum x86_linux_tdesc
xcr0_to_tdesc_idx (uint64_t xcr0, bool is_x32)
{
if (xcr0 & X86_XSTATE_PKRU)
{
if (is_x32)
{
/* No x32 MPX and PKU, fall back to avx_avx512. */
return X86_TDESC_AVX_AVX512;
}
else
return X86_TDESC_AVX_MPX_AVX512_PKU;
}
else if (xcr0 & X86_XSTATE_AVX512)
return X86_TDESC_AVX_AVX512;
else if ((xcr0 & X86_XSTATE_AVX_MPX_MASK) == X86_XSTATE_AVX_MPX_MASK)
{
if (is_x32) /* No MPX on x32. */
return X86_TDESC_AVX;
else
return X86_TDESC_AVX_MPX;
}
else if (xcr0 & X86_XSTATE_MPX)
{
if (is_x32) /* No MPX on x32. */
return X86_TDESC_AVX;
else
return X86_TDESC_MPX;
}
else if (xcr0 & X86_XSTATE_AVX)
return X86_TDESC_AVX;
else if (xcr0 & X86_XSTATE_SSE)
return X86_TDESC_SSE;
else if (xcr0 & X86_XSTATE_X87)
return X86_TDESC_MMX;
else
return X86_TDESC_LAST;
}
#if defined __i386__ || !defined IN_PROCESS_AGENT
static struct target_desc *i386_tdescs[X86_TDESC_LAST] = { };
/* Return the target description according to XCR0. */
const struct target_desc *
i386_linux_read_description (uint64_t xcr0)
{
enum x86_linux_tdesc idx = xcr0_to_tdesc_idx (xcr0, false);
if (idx == X86_TDESC_LAST)
return NULL;
struct target_desc **tdesc = &i386_tdescs[idx];
if (*tdesc == NULL)
{
*tdesc = i386_create_target_description (xcr0, true, false);
init_target_desc (*tdesc, i386_expedite_regs);
}
return *tdesc;;
}
#endif
#ifdef __x86_64__
static target_desc *amd64_tdescs[X86_TDESC_LAST] = { };
static target_desc *x32_tdescs[X86_TDESC_LAST] = { };
const struct target_desc *
amd64_linux_read_description (uint64_t xcr0, bool is_x32)
{
enum x86_linux_tdesc idx = xcr0_to_tdesc_idx (xcr0, is_x32);
if (idx == X86_TDESC_LAST)
return NULL;
struct target_desc **tdesc = NULL;
if (is_x32)
tdesc = &x32_tdescs[idx];
else
tdesc = &amd64_tdescs[idx];
if (*tdesc == NULL)
{
*tdesc = amd64_create_target_description (xcr0, is_x32, true, true);
init_target_desc (*tdesc, amd64_expedite_regs);
}
return *tdesc;
}
#endif
#ifndef IN_PROCESS_AGENT
int
i386_get_ipa_tdesc_idx (const struct target_desc *tdesc)
{
for (int i = 0; i < X86_TDESC_LAST; i++)
{
if (tdesc == i386_tdescs[i])
return i;
}
/* If none tdesc is found, return the one with minimum features. */
return X86_TDESC_MMX;
}
#if defined __x86_64__
int
amd64_get_ipa_tdesc_idx (const struct target_desc *tdesc)
{
for (int i = 0; i < X86_TDESC_LAST; i++)
{
if (tdesc == amd64_tdescs[i])
return i;
}
for (int i = 0; i < X86_TDESC_LAST; i++)
{
if (tdesc == x32_tdescs[i])
return i;
}
return X86_TDESC_SSE;
}
#endif
#endif