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

   1 /* Machine-dependent signal context structure for GNU Hurd.  i386 version.
   2    Copyright (C) 1991-2024 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 _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 */