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Diffstat (limited to 'sysdeps/mach/hurd/x86/exc2signal.c')
-rw-r--r--sysdeps/mach/hurd/x86/exc2signal.c196
1 files changed, 196 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/x86/exc2signal.c b/sysdeps/mach/hurd/x86/exc2signal.c
new file mode 100644
index 0000000000..c4e705121e
--- /dev/null
+++ b/sysdeps/mach/hurd/x86/exc2signal.c
@@ -0,0 +1,196 @@
+/* Translate Mach exception codes into signal numbers.  i386 version.
+   Copyright (C) 1991-2023 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/>.  */
+
+#include <hurd.h>
+#include <hurd/signal.h>
+#include <mach/exception.h>
+
+/* Translate the Mach exception codes, as received in an `exception_raise' RPC,
+   into a signal number and signal subcode.  */
+
+static void
+exception2signal (struct hurd_signal_detail *detail, int *signo, int posix)
+{
+  detail->error = 0;
+
+  switch (detail->exc)
+    {
+    default:
+      *signo = SIGIOT;
+      detail->code = detail->exc;
+      break;
+
+    case EXC_BAD_ACCESS:
+      switch (detail->exc_code)
+        {
+	case KERN_INVALID_ADDRESS:
+	case KERN_MEMORY_FAILURE:
+	  *signo = SIGSEGV;
+	  detail->code = posix ? SEGV_MAPERR : detail->exc_subcode;
+	  break;
+
+	case KERN_PROTECTION_FAILURE:
+	case KERN_WRITE_PROTECTION_FAILURE:
+	  *signo = SIGSEGV;
+	  detail->code = posix ? SEGV_ACCERR : detail->exc_subcode;
+	  break;
+
+	default:
+	  *signo = SIGBUS;
+	  detail->code = posix ? BUS_ADRERR : detail->exc_subcode;
+	  break;
+	}
+      detail->error = detail->exc_code;
+      break;
+
+    case EXC_BAD_INSTRUCTION:
+      *signo = SIGILL;
+      switch (detail->exc_code)
+        {
+	case EXC_I386_INVOP:
+	  detail->code = posix ? ILL_ILLOPC : ILL_INVOPR_FAULT;
+	  break;
+
+	case EXC_I386_STKFLT:
+	  detail->code = posix ? ILL_BADSTK : ILL_STACK_FAULT;
+	  break;
+
+	default:
+	  detail->code = 0;
+	  break;
+	}
+      break;
+
+    case EXC_ARITHMETIC:
+      *signo = SIGFPE;
+      switch (detail->exc_code)
+	{
+	case EXC_I386_DIV:	/* integer divide by zero */
+	  detail->code = posix ? FPE_INTDIV : FPE_INTDIV_FAULT;
+	  break;
+
+	case EXC_I386_INTO:	/* integer overflow */
+	  detail->code = posix ? FPE_INTOVF : FPE_INTOVF_TRAP;
+	  break;
+
+	  /* These aren't anywhere documented or used in Mach 3.0.  */
+	case EXC_I386_NOEXT:
+	case EXC_I386_EXTOVR:
+	default:
+	  detail->code = 0;
+	  break;
+
+	case EXC_I386_EXTERR:
+	  /* Subcode is the fp_status word saved by the hardware.
+	     Give an error code corresponding to the first bit set.  */
+	  if (detail->exc_subcode & FPS_IE)
+	    {
+	      /* NB: We used to send SIGILL here but we can't distinguish
+		 POSIX vs. legacy with respect to what signal we send.  */
+	      detail->code = posix ? FPE_FLTINV : 0 /*ILL_FPEOPR_FAULT*/;
+	    }
+	  else if (detail->exc_subcode & FPS_DE)
+	    {
+	      detail->code = posix ? FPE_FLTUND : FPE_FLTDNR_FAULT;
+	    }
+	  else if (detail->exc_subcode & FPS_ZE)
+	    {
+	      detail->code = posix ? FPE_FLTDIV : FPE_FLTDIV_FAULT;
+	    }
+	  else if (detail->exc_subcode & FPS_OE)
+	    {
+	      detail->code = posix ? FPE_FLTOVF : FPE_FLTOVF_FAULT;
+	    }
+	  else if (detail->exc_subcode & FPS_UE)
+	    {
+	      detail->code = posix ? FPE_FLTUND : FPE_FLTUND_FAULT;
+	    }
+	  else if (detail->exc_subcode & FPS_PE)
+	    {
+	      detail->code = posix ? FPE_FLTRES : FPE_FLTINX_FAULT;
+	    }
+	  else
+	    {
+	      detail->code = 0;
+	    }
+	  break;
+
+	  /* These two can only be arithmetic exceptions if we
+	     are in V86 mode.  (See Mach 3.0 i386/trap.c.)  */
+	case EXC_I386_EMERR:
+	  detail->code = posix ? 0 : FPE_EMERR_FAULT;
+	  break;
+	case EXC_I386_BOUND:
+	  detail->code = posix ? FPE_FLTSUB : FPE_EMBND_FAULT;
+	  break;
+	}
+      break;
+
+    case EXC_EMULATION:
+      /* 3.0 doesn't give this one, why, I don't know.  */
+      *signo = SIGEMT;
+      detail->code = 0;
+      break;
+
+    case EXC_SOFTWARE:
+      /* The only time we get this in Mach 3.0
+	 is for an out of bounds trap.  */
+      if (detail->exc_code == EXC_I386_BOUND)
+	{
+	  *signo = SIGFPE;
+	  detail->code = posix ? FPE_FLTSUB : FPE_SUBRNG_FAULT;
+	}
+      else
+	{
+	  *signo = SIGEMT;
+	  detail->code = 0;
+	}
+      break;
+
+    case EXC_BREAKPOINT:
+      *signo = SIGTRAP;
+      switch (detail->exc_code)
+        {
+	case EXC_I386_SGL:
+	  detail->code = posix ? TRAP_BRKPT : DBG_SINGLE_TRAP;
+	  break;
+
+	case EXC_I386_BPT:
+	  detail->code = posix ? TRAP_BRKPT : DBG_BRKPNT_FAULT;
+	  break;
+
+	default:
+	  detail->code = 0;
+	  break;
+	}
+      break;
+    }
+}
+libc_hidden_def (_hurd_exception2signal)
+
+void
+_hurd_exception2signal (struct hurd_signal_detail *detail, int *signo)
+{
+  exception2signal (detail, signo, 1);
+}
+
+void
+_hurd_exception2signal_legacy (struct hurd_signal_detail *detail, int *signo)
+{
+  exception2signal (detail, signo, 0);
+}