--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libffi/src/m88k/ffi.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,400 @@
+/*
+ * Copyright (c) 2013 Miodrag Vallat.  <miod@openbsd.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * ``Software''), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * m88k Foreign Function Interface
+ *
+ * This file attempts to provide all the FFI entry points which can reliably
+ * be implemented in C.
+ *
+ * Only OpenBSD/m88k is currently supported; other platforms (such as
+ * Motorola's SysV/m88k) could be supported with the following tweaks:
+ *
+ * - non-OpenBSD systems use an `outgoing parameter area' as part of the
+ *   88BCS calling convention, which is not supported under OpenBSD from
+ *   release 3.6 onwards.  Supporting it should be as easy as taking it
+ *   into account when adjusting the stack, in the assembly code.
+ *
+ * - the logic deciding whether a function argument gets passed through
+ *   registers, or on the stack, has changed several times in OpenBSD in
+ *   edge cases (especially for structs larger than 32 bytes being passed
+ *   by value). The code below attemps to match the logic used by the
+ *   system compiler of OpenBSD 5.3, i.e. gcc 3.3.6 with many m88k backend
+ *   fixes.
+ */
+
+#include <ffi.h>
+#include <ffi_common.h>
+
+#include <stdlib.h>
+#include <unistd.h>
+
+void ffi_call_OBSD (unsigned int, extended_cif *, unsigned int, void *,
+		    void (*fn) ());
+void *ffi_prep_args (void *, extended_cif *);
+void ffi_closure_OBSD (ffi_closure *);
+void ffi_closure_struct_OBSD (ffi_closure *);
+unsigned int ffi_closure_OBSD_inner (ffi_closure *, void *, unsigned int *,
+				     char *);
+void ffi_cacheflush_OBSD (unsigned int, unsigned int);
+
+#define CIF_FLAGS_INT		(1 << 0)
+#define CIF_FLAGS_DINT		(1 << 1)
+
+/*
+ * Foreign Function Interface API
+ */
+
+/* ffi_prep_args is called by the assembly routine once stack space has
+   been allocated for the function's arguments.  */
+
+void *
+ffi_prep_args (void *stack, extended_cif *ecif)
+{
+  unsigned int i;
+  void **p_argv;
+  char *argp, *stackp;
+  unsigned int *regp;
+  unsigned int regused;
+  ffi_type **p_arg;
+  void *struct_value_ptr;
+
+  regp = (unsigned int *)stack;
+  stackp = (char *)(regp + 8);
+  regused = 0;
+
+  if (ecif->cif->rtype->type == FFI_TYPE_STRUCT
+      && !ecif->cif->flags)
+    struct_value_ptr = ecif->rvalue;
+  else
+    struct_value_ptr = NULL;
+
+  p_argv = ecif->avalue;
+
+  for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types; i != 0; i--, p_arg++)
+    {
+      size_t z;
+      unsigned short t, a;
+
+      z = (*p_arg)->size;
+      t = (*p_arg)->type;
+      a = (*p_arg)->alignment;
+
+      /*
+       * Figure out whether the argument can be passed through registers
+       * or on the stack.
+       * The rule is that registers can only receive simple types not larger
+       * than 64 bits, or structs the exact size of a register and aligned to
+       * the size of a register.
+       */
+      if (t == FFI_TYPE_STRUCT)
+	{
+	  if (z == sizeof (int) && a == sizeof (int) && regused < 8)
+	    argp = (char *)regp;
+	  else
+	    argp = stackp;
+	}
+      else
+	{
+	  if (z > sizeof (int) && regused < 8 - 1)
+	    {
+	      /* align to an even register pair */
+	      if (regused & 1)
+		{
+		  regp++;
+		  regused++;
+		}
+	    }
+	  if (regused < 8)
+	    argp = (char *)regp;
+	  else
+	    argp = stackp;
+	}
+
+      /* Enforce proper stack alignment of 64-bit types */
+      if (argp == stackp && a > sizeof (int))
+	{
+	  stackp = (char *) ALIGN(stackp, a);
+	  argp = stackp;
+	}
+
+      switch (t)
+	{
+	case FFI_TYPE_SINT8:
+	  *(signed int *) argp = (signed int) *(SINT8 *) *p_argv;
+	  break;
+
+	case FFI_TYPE_UINT8:
+	  *(unsigned int *) argp = (unsigned int) *(UINT8 *) *p_argv;
+	  break;
+
+	case FFI_TYPE_SINT16:
+	  *(signed int *) argp = (signed int) *(SINT16 *) *p_argv;
+	  break;
+
+	case FFI_TYPE_UINT16:
+	  *(unsigned int *) argp = (unsigned int) *(UINT16 *) *p_argv;
+	  break;
+
+	case FFI_TYPE_INT:
+	case FFI_TYPE_FLOAT:
+	case FFI_TYPE_UINT32:
+	case FFI_TYPE_SINT32:
+	case FFI_TYPE_POINTER:
+	  *(unsigned int *) argp = *(unsigned int *) *p_argv;
+	  break;
+
+	case FFI_TYPE_DOUBLE:
+	case FFI_TYPE_UINT64:
+	case FFI_TYPE_SINT64:
+	case FFI_TYPE_STRUCT:
+	  memcpy (argp, *p_argv, z);
+	  break;
+
+	default:
+	  FFI_ASSERT (0);
+	}
+
+      /* Align if necessary.  */
+      if ((sizeof (int) - 1) & z)
+	z = ALIGN(z, sizeof (int));
+
+      p_argv++;
+
+      /* Be careful, once all registers are filled, and about to continue
+         on stack, regp == stackp.  Therefore the check for regused as well. */
+      if (argp == (char *)regp && regused < 8)
+	{
+	  regp += z / sizeof (int);
+	  regused += z / sizeof (int);
+	}
+      else
+	stackp += z;
+    }
+
+  return struct_value_ptr;
+}
+
+/* Perform machine dependent cif processing */
+ffi_status
+ffi_prep_cif_machdep (ffi_cif *cif)
+{
+  /* Set the return type flag */
+  switch (cif->rtype->type)
+    {
+    case FFI_TYPE_VOID:
+      cif->flags = 0;
+      break;
+
+    case FFI_TYPE_STRUCT:
+      if (cif->rtype->size == sizeof (int) &&
+	  cif->rtype->alignment == sizeof (int))
+	cif->flags = CIF_FLAGS_INT;
+      else
+	cif->flags = 0;
+      break;
+
+    case FFI_TYPE_DOUBLE:
+    case FFI_TYPE_SINT64:
+    case FFI_TYPE_UINT64:
+      cif->flags = CIF_FLAGS_DINT;
+      break;
+
+    default:
+      cif->flags = CIF_FLAGS_INT;
+      break;
+    }
+
+  return FFI_OK;
+}
+
+void
+ffi_call (ffi_cif *cif, void (*fn) (), void *rvalue, void **avalue)
+{
+  extended_cif ecif;
+
+  ecif.cif = cif;
+  ecif.avalue = avalue;
+
+  /* If the return value is a struct and we don't have a return value
+     address then we need to make one.  */
+
+  if (rvalue == NULL
+      && cif->rtype->type == FFI_TYPE_STRUCT
+      && (cif->rtype->size != sizeof (int)
+	  || cif->rtype->alignment != sizeof (int)))
+    ecif.rvalue = alloca (cif->rtype->size);
+  else
+    ecif.rvalue = rvalue;
+
+  switch (cif->abi)
+    {
+    case FFI_OBSD:
+      ffi_call_OBSD (cif->bytes, &ecif, cif->flags, ecif.rvalue, fn);
+      break;
+
+    default:
+      FFI_ASSERT (0);
+      break;
+    }
+}
+
+/*
+ * Closure API
+ */
+
+static void
+ffi_prep_closure_args_OBSD (ffi_cif *cif, void **avalue, unsigned int *regp,
+			    char *stackp)
+{
+  unsigned int i;
+  void **p_argv;
+  char *argp;
+  unsigned int regused;
+  ffi_type **p_arg;
+
+  regused = 0;
+
+  p_argv = avalue;
+
+  for (i = cif->nargs, p_arg = cif->arg_types; i != 0; i--, p_arg++)
+    {
+      size_t z;
+      unsigned short t, a;
+
+      z = (*p_arg)->size;
+      t = (*p_arg)->type;
+      a = (*p_arg)->alignment;
+
+      /*
+       * Figure out whether the argument has been passed through registers
+       * or on the stack.
+       * The rule is that registers can only receive simple types not larger
+       * than 64 bits, or structs the exact size of a register and aligned to
+       * the size of a register.
+       */
+      if (t == FFI_TYPE_STRUCT)
+	{
+	  if (z == sizeof (int) && a == sizeof (int) && regused < 8)
+	    argp = (char *)regp;
+	  else
+	    argp = stackp;
+	}
+      else
+	{
+	  if (z > sizeof (int) && regused < 8 - 1)
+	    {
+	      /* align to an even register pair */
+	      if (regused & 1)
+		{
+		  regp++;
+		  regused++;
+		}
+	    }
+	  if (regused < 8)
+	    argp = (char *)regp;
+	  else
+	    argp = stackp;
+	}
+
+      /* Enforce proper stack alignment of 64-bit types */
+      if (argp == stackp && a > sizeof (int))
+	{
+	  stackp = (char *) ALIGN(stackp, a);
+	  argp = stackp;
+	}
+
+      if (z < sizeof (int) && t != FFI_TYPE_STRUCT)
+	*p_argv = (void *) (argp + sizeof (int) - z);
+      else
+	*p_argv = (void *) argp;
+
+      /* Align if necessary */
+      if ((sizeof (int) - 1) & z)
+	z = ALIGN(z, sizeof (int));
+
+      p_argv++;
+
+      /* Be careful, once all registers are exhausted, and about to fetch from
+	 stack, regp == stackp.  Therefore the check for regused as well. */
+      if (argp == (char *)regp && regused < 8)
+	{
+	  regp += z / sizeof (int);
+	  regused += z / sizeof (int);
+	}
+      else
+	stackp += z;
+    }
+}
+
+unsigned int
+ffi_closure_OBSD_inner (ffi_closure *closure, void *resp, unsigned int *regp,
+			char *stackp)
+{
+  ffi_cif *cif;
+  void **arg_area;
+
+  cif = closure->cif;
+  arg_area = (void**) alloca (cif->nargs * sizeof (void *));
+
+  ffi_prep_closure_args_OBSD(cif, arg_area, regp, stackp);
+
+  (closure->fun) (cif, resp, arg_area, closure->user_data);
+
+  return cif->flags;
+}
+
+ffi_status
+ffi_prep_closure_loc (ffi_closure* closure, ffi_cif* cif,
+		      void (*fun)(ffi_cif*,void*,void**,void*),
+		      void *user_data, void *codeloc)
+{
+  unsigned int *tramp = (unsigned int *) codeloc;
+  void *fn;
+
+  FFI_ASSERT (cif->abi == FFI_OBSD);
+
+  if (cif->rtype->type == FFI_TYPE_STRUCT && !cif->flags)
+    fn = &ffi_closure_struct_OBSD;
+  else
+    fn = &ffi_closure_OBSD;
+
+  /* or.u %r10, %r0, %hi16(fn) */
+  tramp[0] = 0x5d400000 | (((unsigned int)fn) >> 16);
+  /* or.u %r13, %r0, %hi16(closure) */
+  tramp[1] = 0x5da00000 | ((unsigned int)closure >> 16);
+  /* or %r10, %r10, %lo16(fn) */
+  tramp[2] = 0x594a0000 | (((unsigned int)fn) & 0xffff);
+  /* jmp.n %r10 */
+  tramp[3] = 0xf400c40a;
+  /* or %r13, %r13, %lo16(closure) */
+  tramp[4] = 0x59ad0000 | ((unsigned int)closure & 0xffff);
+
+  ffi_cacheflush_OBSD((unsigned int)codeloc, FFI_TRAMPOLINE_SIZE);
+
+  closure->cif  = cif;
+  closure->user_data = user_data;
+  closure->fun  = fun;
+
+  return FFI_OK;
+}