1 /* Machine-dependent signal context structure for GNU Hurd. i386 version. 2 Copyright (C) 1991-2022 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 */ 126