sysdeps/mach/x86/thread_state.h

   1 /* Mach thread state definitions for machine-independent code.  i386 version.
   2    Copyright (C) 1994-2024 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 #define MACHINE_THREAD_STATE_FIX_NEW(ts) do { \
  38         asm ("mov %%cs, %w0" : "=q" ((ts)->cs)); \
  39 } while(0)
  40 #else
  41 #define PC eip
  42 #define SP uesp
  43 #define SYSRETURN eax
  44 #define MACHINE_THREAD_STATE_FIX_NEW(ts) do { \
  45         asm ("mov %%cs, %w0" : "=q" ((ts)->cs)); \
  46         asm ("mov %%ds, %w0" : "=q" ((ts)->ds)); \
  47         asm ("mov %%es, %w0" : "=q" ((ts)->es)); \
  48         asm ("mov %%fs, %w0" : "=q" ((ts)->fs)); \
  49         asm ("mov %%gs, %w0" : "=q" ((ts)->gs)); \
  50 } while(0)
  51 #endif
  52
  53 struct machine_thread_all_state
  54   {
  55     int set;                    /* Mask of bits (1 << FLAVOR).  */
  56     struct i386_thread_state basic;
  57     struct i386_float_state fpu;
  58   };
  59
  60 #ifdef __x86_64__
  61 /* We're setting up the stack to perform a function call.  On function entry,
  62    the stack pointer must be 8 bytes less than 16-aligned.  */
  63 #define PTR_ALIGN_DOWN_8_16(ptr)                                              \
  64  ({ uintptr_t __ptr = PTR_ALIGN_DOWN (ptr, 8);                                \
  65     PTR_IS_ALIGNED (__ptr, 16) ? (__ptr - 8) : __ptr; })
  66
  67 #define MACHINE_THREAD_STATE_SETUP_CALL(ts, stack, size, func)                \
  68   ((ts)->SP = PTR_ALIGN_DOWN_8_16 ((uintptr_t) (stack) + (size)),             \
  69    (ts)->PC = (uintptr_t) func)
  70 #endif
  71
  72 #include <sysdeps/mach/thread_state.h>
  73
  74 #endif /* mach/x86/thread_state.h */