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/* Machine-dependent signal context structure for GNU Hurd. i386 version.
Copyright (C) 1991-2024 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
<https://www.gnu.org/licenses/>. */
#ifndef _BITS_SIGCONTEXT_H
#define _BITS_SIGCONTEXT_H 1
#if !defined _SIGNAL_H && !defined _SYS_UCONTEXT_H
# error "Never use <bits/sigcontext.h> directly; include <signal.h> instead."
#endif
/* Signal handlers are actually called:
void handler (int sig, int code, struct sigcontext *scp); */
#include <bits/types/__sigset_t.h>
#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
/* The deprecated sigcode values below are passed as an extra, non-portable
argument to regular signal handlers. You should use SA_SIGINFO handlers
instead, which use the standard POSIX signal codes. */
/* 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 /* bits/sigcontext.h */
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