1  /* Machine-dependent signal context structure for GNU Hurd.  i386 version.
       2     Copyright (C) 1991-2023 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 _BITS_SIGCONTEXT_H
      20  #define _BITS_SIGCONTEXT_H 1
      21  
      22  #if !defined _SIGNAL_H && !defined _SYS_UCONTEXT_H
      23  # error "Never use <bits/sigcontext.h> directly; include <signal.h> instead."
      24  #endif
      25  
      26  /* Signal handlers are actually called:
      27     void handler (int sig, int code, struct sigcontext *scp);  */
      28  
      29  #include <bits/types/__sigset_t.h>
      30  #include <mach/machine/fp_reg.h>
      31  
      32  /* State of this thread when the signal was taken.  */
      33  struct sigcontext
      34    {
      35      /* These first members are machine-independent.  */
      36  
      37      int sc_onstack;		/* Nonzero if running on sigstack.  */
      38      __sigset_t sc_mask;		/* Blocked signals to restore.  */
      39  
      40      /* MiG reply port this thread is using.  */
      41      unsigned int sc_reply_port;
      42  
      43      /* Port this thread is doing an interruptible RPC on.  */
      44      unsigned int sc_intr_port;
      45  
      46      /* Error code associated with this signal (interpreted as `error_t').  */
      47      int sc_error;
      48  
      49      /* All following members are machine-dependent.  The rest of this
      50         structure is written to be laid out identically to:
      51         {
      52  	 struct i386_thread_state basic;
      53  	 struct i386_float_state fpu;
      54         }
      55         trampoline.c knows this, so it must be changed if this changes.  */
      56  
      57  #define sc_i386_thread_state sc_gs /* Beginning of correspondence.  */
      58      /* Segment registers.  */
      59      int sc_gs;
      60      int sc_fs;
      61      int sc_es;
      62      int sc_ds;
      63  
      64      /* "General" registers.  These members are in the order that the i386
      65         `pusha' and `popa' instructions use (`popa' ignores %esp).  */
      66      int sc_edi;
      67      int sc_esi;
      68      int sc_ebp;
      69      int sc_esp;			/* Not used; sc_uesp is used instead.  */
      70      int sc_ebx;
      71      int sc_edx;
      72      int sc_ecx;
      73      int sc_eax;
      74  
      75      int sc_eip;			/* Instruction pointer.  */
      76      int sc_cs;			/* Code segment register.  */
      77  
      78      int sc_efl;			/* Processor flags.  */
      79  
      80      int sc_uesp;		/* This stack pointer is used.  */
      81      int sc_ss;			/* Stack segment register.  */
      82  
      83      /* Following mimics struct i386_float_state.  Structures and symbolic
      84         values can be found in <mach/i386/fp_reg.h>.  */
      85  #define sc_i386_float_state sc_fpkind
      86      int sc_fpkind;		/* FP_NO, FP_387, etc.  */
      87      int sc_fpused;		/* If zero, ignore rest of float state.  */
      88      struct i386_fp_save sc_fpsave;
      89      struct i386_fp_regs sc_fpregs;
      90      int sc_fpexcsr;		/* FPSR including exception bits.  */
      91    };
      92  
      93  /* Traditional BSD names for some members.  */
      94  #define sc_sp	sc_uesp		/* Stack pointer.  */
      95  #define sc_fp	sc_ebp		/* Frame pointer.  */
      96  #define sc_pc	sc_eip		/* Process counter.  */
      97  #define sc_ps	sc_efl
      98  
      99  
     100  /* The deprecated sigcode values below are passed as an extra, non-portable
     101     argument to regular signal handlers.  You should use SA_SIGINFO handlers
     102     instead, which use the standard POSIX signal codes.  */
     103  
     104  /* Codes for SIGFPE.  */
     105  #define FPE_INTOVF_TRAP		0x1 /* integer overflow */
     106  #define FPE_INTDIV_FAULT	0x2 /* integer divide by zero */
     107  #define FPE_FLTOVF_FAULT	0x3 /* floating overflow */
     108  #define FPE_FLTDIV_FAULT	0x4 /* floating divide by zero */
     109  #define FPE_FLTUND_FAULT	0x5 /* floating underflow */
     110  #define FPE_SUBRNG_FAULT	0x7 /* BOUNDS instruction failed */
     111  #define FPE_FLTDNR_FAULT	0x8 /* denormalized operand */
     112  #define FPE_FLTINX_FAULT	0x9 /* floating loss of precision */
     113  #define FPE_EMERR_FAULT		0xa /* mysterious emulation error 33 */
     114  #define FPE_EMBND_FAULT		0xb /* emulation BOUNDS instruction failed */
     115  
     116  /* Codes for SIGILL.  */
     117  #define ILL_INVOPR_FAULT	0x1 /* invalid operation */
     118  #define ILL_STACK_FAULT		0x2 /* fault on microkernel stack access */
     119  #define ILL_FPEOPR_FAULT	0x3 /* invalid floating operation */
     120  
     121  /* Codes for SIGTRAP.  */
     122  #define DBG_SINGLE_TRAP		0x1 /* single step */
     123  #define DBG_BRKPNT_FAULT	0x2 /* breakpoint instruction */
     124  
     125  #endif /* bits/sigcontext.h */