sysdeps/mach/hurd/i386/bits/sigcontext.h

   1 /* Machine-dependent signal context structure for GNU Hurd.  i386 version.
   2    Copyright (C) 1991-2015 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #if !defined _SIGNAL_H && !defined _SYS_UCONTEXT_H
  20 # error "Never use <bits/sigcontext.h> directly; include <signal.h> instead."
  21 #endif
  22
  23 #ifndef sc_pc
  24
  25 /* Signal handlers are actually called:
  26    void handler (int sig, int code, struct sigcontext *scp);  */
  27
  28 #include <mach/machine/fp_reg.h>
  29
  30 /* State of this thread when the signal was taken.  */
  31 struct sigcontext
  32   {
  33     /* These first members are machine-independent.  */
  34
  35     int sc_onstack;             /* Nonzero if running on sigstack.  */
  36     __sigset_t sc_mask;         /* Blocked signals to restore.  */
  37
  38     /* MiG reply port this thread is using.  */
  39     unsigned int sc_reply_port;
  40
  41     /* Port this thread is doing an interruptible RPC on.  */
  42     unsigned int sc_intr_port;
  43
  44     /* Error code associated with this signal (interpreted as `error_t').  */
  45     int sc_error;
  46
  47     /* All following members are machine-dependent.  The rest of this
  48        structure is written to be laid out identically to:
  49        {
  50          struct i386_thread_state basic;
  51          struct i386_float_state fpu;
  52        }
  53        trampoline.c knows this, so it must be changed if this changes.  */
  54
  55 #define sc_i386_thread_state sc_gs /* Beginning of correspondence.  */
  56     /* Segment registers.  */
  57     int sc_gs;
  58     int sc_fs;
  59     int sc_es;
  60     int sc_ds;
  61
  62     /* "General" registers.  These members are in the order that the i386
  63        `pusha' and `popa' instructions use (`popa' ignores %esp).  */
  64     int sc_edi;
  65     int sc_esi;
  66     int sc_ebp;
  67     int sc_esp;                 /* Not used; sc_uesp is used instead.  */
  68     int sc_ebx;
  69     int sc_edx;
  70     int sc_ecx;
  71     int sc_eax;
  72
  73     int sc_eip;                 /* Instruction pointer.  */
  74     int sc_cs;                  /* Code segment register.  */
  75
  76     int sc_efl;                 /* Processor flags.  */
  77
  78     int sc_uesp;                /* This stack pointer is used.  */
  79     int sc_ss;                  /* Stack segment register.  */
  80
  81     /* Following mimics struct i386_float_state.  Structures and symbolic
  82        values can be found in <mach/i386/fp_reg.h>.  */
  83 #define sc_i386_float_state sc_fpkind
  84     int sc_fpkind;              /* FP_NO, FP_387, etc.  */
  85     int sc_fpused;              /* If zero, ignore rest of float state.  */
  86     struct i386_fp_save sc_fpsave;
  87     struct i386_fp_regs sc_fpregs;
  88     int sc_fpexcsr;             /* FPSR including exception bits.  */
  89   };
  90
  91 /* Traditional BSD names for some members.  */
  92 #define sc_sp   sc_uesp         /* Stack pointer.  */
  93 #define sc_fp   sc_ebp          /* Frame pointer.  */
  94 #define sc_pc   sc_eip          /* Process counter.  */
  95 #define sc_ps   sc_efl
  96
  97
  98 /* Codes for SIGFPE.  */
  99 #define FPE_INTOVF_TRAP         0x1 /* integer overflow */
 100 #define FPE_INTDIV_FAULT        0x2 /* integer divide by zero */
 101 #define FPE_FLTOVF_FAULT        0x3 /* floating overflow */
 102 #define FPE_FLTDIV_FAULT        0x4 /* floating divide by zero */
 103 #define FPE_FLTUND_FAULT        0x5 /* floating underflow */
 104 #define FPE_SUBRNG_FAULT        0x7 /* BOUNDS instruction failed */
 105 #define FPE_FLTDNR_FAULT        0x8 /* denormalized operand */
 106 #define FPE_FLTINX_FAULT        0x9 /* floating loss of precision */
 107 #define FPE_EMERR_FAULT         0xa /* mysterious emulation error 33 */
 108 #define FPE_EMBND_FAULT         0xb /* emulation BOUNDS instruction failed */
 109
 110 /* Codes for SIGILL.  */
 111 #define ILL_INVOPR_FAULT        0x1 /* invalid operation */
 112 #define ILL_STACK_FAULT         0x2 /* fault on microkernel stack access */
 113 #define ILL_FPEOPR_FAULT        0x3 /* invalid floating operation */
 114
 115 /* Codes for SIGTRAP.  */
 116 #define DBG_SINGLE_TRAP         0x1 /* single step */
 117 #define DBG_BRKPNT_FAULT        0x2 /* breakpoint instruction */
 118
 119 #endif /* sc_pc */