gdb/i386-linux-tdep.h

   1 /* Target-dependent code for GNU/Linux x86.
   2
   3    Copyright (C) 2002, 2003, 2007, 2008, 2009, 2010
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef I386_LINUX_TDEP_H
  22 #define I386_LINUX_TDEP_H
  23
  24 /* The Linux kernel pretends there is an additional "orig_eax"
  25    register.  Since GDB needs access to that register to be able to
  26    properly restart system calls when necessary (see
  27    i386-linux-tdep.c) we need our own versions of a number of
  28    functions that deal with GDB's register cache.  */
  29
  30 /* Register number for the "orig_eax" pseudo-register.  If this
  31    pseudo-register contains a value >= 0 it is interpreted as the
  32    system call number that the kernel is supposed to restart.  */
  33 #define I386_LINUX_ORIG_EAX_REGNUM I386_AVX_NUM_REGS
  34
  35 /* Total number of registers for GNU/Linux.  */
  36 #define I386_LINUX_NUM_REGS (I386_LINUX_ORIG_EAX_REGNUM + 1)
  37
  38 /* Get XSAVE extended state xcr0 from core dump.  */
  39 extern uint64_t i386_linux_core_read_xcr0
  40   (struct gdbarch *gdbarch, struct target_ops *target, bfd *abfd);
  41
  42 /* Linux target description.  */
  43 extern struct target_desc *tdesc_i386_linux;
  44 extern struct target_desc *tdesc_i386_avx_linux;
  45
  46 /* Format of XSAVE extended state is:
  47         struct
  48         {
  49           fxsave_bytes[0..463]
  50           sw_usable_bytes[464..511]
  51           xstate_hdr_bytes[512..575]
  52           avx_bytes[576..831]
  53           future_state etc
  54         };
  55
  56   Same memory layout will be used for the coredump NT_X86_XSTATE
  57   representing the XSAVE extended state registers.
  58
  59   The first 8 bytes of the sw_usable_bytes[464..467] is the OS enabled
  60   extended state mask, which is the same as the extended control register
  61   0 (the XFEATURE_ENABLED_MASK register), XCR0.  We can use this mask
  62   together with the mask saved in the xstate_hdr_bytes to determine what
  63   states the processor/OS supports and what state, used or initialized,
  64   the process/thread is in.  */
  65 #define I386_LINUX_XSAVE_XCR0_OFFSET 464
  66
  67 #endif /* i386-linux-tdep.h */