text: /* Machine-dependent signal context structure for GNU Hurd.  i386 version.
     Copyright (C) 1991-2015 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
  
     The GNU C Library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
  
     The GNU C Library 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
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public
     License along with the GNU C Library; if not, see
     <http://www.gnu.org/licenses/>.  */
  
  #if !defined _SIGNAL_H && !defined _SYS_UCONTEXT_H
  # error "Never use <bits/sigcontext.h> directly; include <signal.h> instead."
  #endif
  
  #ifndef sc_pc
  
  /* Signal handlers are actually called:
     void handler (int sig, int code, struct sigcontext *scp);  */
  
  #include <mach/machine/fp_reg.h>
  
  /* State of this thread when the signal was taken.  */
  struct sigcontext
    {
      /* These first members are machine-independent.  */
  
      int sc_onstack;		/* Nonzero if running on sigstack.  */
      __sigset_t sc_mask;		/* Blocked signals to restore.  */
  
      /* MiG reply port this thread is using.  */
      unsigned int sc_reply_port;
  
      /* Port this thread is doing an interruptible RPC on.  */
      unsigned int sc_intr_port;
  
      /* Error code associated with this signal (interpreted as `error_t').  */
      int sc_error;
  
      /* All following members are machine-dependent.  The rest of this
         structure is written to be laid out identically to:
         {
  	 struct i386_thread_state basic;
  	 struct i386_float_state fpu;
         }
         trampoline.c knows this, so it must be changed if this changes.  */
  
  #define sc_i386_thread_state sc_gs /* Beginning of correspondence.  */
      /* Segment registers.  */
      int sc_gs;
      int sc_fs;
      int sc_es;
      int sc_ds;
  
      /* "General" registers.  These members are in the order that the i386
         `pusha' and `popa' instructions use (`popa' ignores %esp).  */
      int sc_edi;
      int sc_esi;
      int sc_ebp;
      int sc_esp;			/* Not used; sc_uesp is used instead.  */
      int sc_ebx;
      int sc_edx;
      int sc_ecx;
      int sc_eax;
  
      int sc_eip;			/* Instruction pointer.  */
      int sc_cs;			/* Code segment register.  */
  
      int sc_efl;			/* Processor flags.  */
  
      int sc_uesp;		/* This stack pointer is used.  */
      int sc_ss;			/* Stack segment register.  */
  
      /* Following mimics struct i386_float_state.  Structures and symbolic
         values can be found in <mach/i386/fp_reg.h>.  */
  #define sc_i386_float_state sc_fpkind
      int sc_fpkind;		/* FP_NO, FP_387, etc.  */
      int sc_fpused;		/* If zero, ignore rest of float state.  */
      struct i386_fp_save sc_fpsave;
      struct i386_fp_regs sc_fpregs;
      int sc_fpexcsr;		/* FPSR including exception bits.  */
    };
  
  /* Traditional BSD names for some members.  */
  #define sc_sp	sc_uesp		/* Stack pointer.  */
  #define sc_fp	sc_ebp		/* Frame pointer.  */
  #define sc_pc	sc_eip		/* Process counter.  */
  #define sc_ps	sc_efl
  
  
  /* Codes for SIGFPE.  */
  #define FPE_INTOVF_TRAP		0x1 /* integer overflow */
  #define FPE_INTDIV_FAULT	0x2 /* integer divide by zero */
  #define FPE_FLTOVF_FAULT	0x3 /* floating overflow */
  #define FPE_FLTDIV_FAULT	0x4 /* floating divide by zero */
  #define FPE_FLTUND_FAULT	0x5 /* floating underflow */
  #define FPE_SUBRNG_FAULT	0x7 /* BOUNDS instruction failed */
  #define FPE_FLTDNR_FAULT	0x8 /* denormalized operand */
  #define FPE_FLTINX_FAULT	0x9 /* floating loss of precision */
  #define FPE_EMERR_FAULT		0xa /* mysterious emulation error 33 */
  #define FPE_EMBND_FAULT		0xb /* emulation BOUNDS instruction failed */
  
  /* Codes for SIGILL.  */
  #define ILL_INVOPR_FAULT	0x1 /* invalid operation */
  #define ILL_STACK_FAULT		0x2 /* fault on microkernel stack access */
  #define ILL_FPEOPR_FAULT	0x3 /* invalid floating operation */
  
  /* Codes for SIGTRAP.  */
  #define DBG_SINGLE_TRAP		0x1 /* single step */
  #define DBG_BRKPNT_FAULT	0x2 /* breakpoint instruction */
  
  #endif /* sc_pc */
  