1  /* Mach thread state definitions for machine-independent code.  i386 version.
       2     Copyright (C) 1994-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #ifndef _MACH_X86_THREAD_STATE_H
      20  #define _MACH_X86_THREAD_STATE_H 1
      21  
      22  #include <mach/machine/thread_status.h>
      23  #include <libc-pointer-arith.h>
      24  
      25  /* This lets the kernel define segments for a new thread.  */
      26  #define MACHINE_NEW_THREAD_STATE_FLAVOR	i386_THREAD_STATE
      27  /* This makes the kernel load our segments descriptors.  */
      28  #define MACHINE_THREAD_STATE_FLAVOR	i386_REGS_SEGS_STATE
      29  #define MACHINE_THREAD_STATE_COUNT	i386_THREAD_STATE_COUNT
      30  
      31  #define machine_thread_state i386_thread_state
      32  
      33  #ifdef __x86_64__
      34  #define PC rip
      35  #define SP ursp
      36  #define SYSRETURN rax
      37  #else
      38  #define PC eip
      39  #define SP uesp
      40  #define SYSRETURN eax
      41  #endif
      42  
      43  #define MACHINE_THREAD_STATE_FIX_NEW(ts) do { \
      44  	asm ("mov %%cs, %w0" : "=q" ((ts)->cs)); \
      45  	asm ("mov %%ds, %w0" : "=q" ((ts)->ds)); \
      46  	asm ("mov %%es, %w0" : "=q" ((ts)->es)); \
      47  	asm ("mov %%fs, %w0" : "=q" ((ts)->fs)); \
      48  	asm ("mov %%gs, %w0" : "=q" ((ts)->gs)); \
      49  } while(0)
      50  
      51  struct machine_thread_all_state
      52    {
      53      int set;			/* Mask of bits (1 << FLAVOR).  */
      54      struct i386_thread_state basic;
      55      struct i386_float_state fpu;
      56    };
      57  
      58  #ifdef __x86_64__
      59  /* We're setting up the stack to perform a function call.  On function entry,
      60     the stack pointer must be 8 bytes less than 16-aligned.  */
      61  #define PTR_ALIGN_DOWN_8_16(ptr)					      \
      62   ({ uintptr_t __ptr = PTR_ALIGN_DOWN (ptr, 8);				      \
      63      PTR_IS_ALIGNED (__ptr, 16) ? (__ptr - 8) : __ptr; })
      64  
      65  #define MACHINE_THREAD_STATE_SETUP_CALL(ts, stack, size, func)		      \
      66    ((ts)->SP = PTR_ALIGN_DOWN_8_16 ((uintptr_t) (stack) + (size)),	      \
      67     (ts)->PC = (uintptr_t) func)
      68  #endif
      69  
      70  #include <sysdeps/mach/thread_state.h>
      71  
      72  #endif /* mach/x86/thread_state.h */