/*
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* Copyright (c) 2013 Miodrag Vallat. <miod@openbsd.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* ``Software''), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* vax Foreign Function Interface
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*
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* This file attempts to provide all the FFI entry points which can reliably
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* be implemented in C.
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*/
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#include <ffi.h>
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#include <ffi_common.h>
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#include <stdlib.h>
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#include <unistd.h>
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#define CIF_FLAGS_CHAR 1 /* for struct only */
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#define CIF_FLAGS_SHORT 2 /* for struct only */
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#define CIF_FLAGS_INT 4
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#define CIF_FLAGS_DINT 8
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/*
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* Foreign Function Interface API
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*/
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void ffi_call_elfbsd (extended_cif *, unsigned, unsigned, void *,
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void (*) ());
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void *ffi_prep_args (extended_cif *ecif, void *stack);
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void *
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ffi_prep_args (extended_cif *ecif, void *stack)
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{
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unsigned int i;
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void **p_argv;
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char *argp;
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ffi_type **p_arg;
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void *struct_value_ptr;
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argp = stack;
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if (ecif->cif->rtype->type == FFI_TYPE_STRUCT
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&& !ecif->cif->flags)
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struct_value_ptr = ecif->rvalue;
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else
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struct_value_ptr = NULL;
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p_argv = ecif->avalue;
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for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types;
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i != 0;
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i--, p_arg++)
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{
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size_t z;
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z = (*p_arg)->size;
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if (z < sizeof (int))
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{
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switch ((*p_arg)->type)
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{
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case FFI_TYPE_SINT8:
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*(signed int *) argp = (signed int) *(SINT8 *) *p_argv;
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break;
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case FFI_TYPE_UINT8:
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*(unsigned int *) argp = (unsigned int) *(UINT8 *) *p_argv;
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break;
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case FFI_TYPE_SINT16:
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*(signed int *) argp = (signed int) *(SINT16 *) *p_argv;
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break;
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case FFI_TYPE_UINT16:
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*(unsigned int *) argp = (unsigned int) *(UINT16 *) *p_argv;
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break;
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case FFI_TYPE_STRUCT:
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memcpy (argp, *p_argv, z);
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break;
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default:
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FFI_ASSERT (0);
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}
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z = sizeof (int);
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}
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else
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{
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memcpy (argp, *p_argv, z);
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/* Align if necessary. */
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if ((sizeof(int) - 1) & z)
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z = ALIGN(z, sizeof(int));
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}
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p_argv++;
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argp += z;
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}
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return struct_value_ptr;
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}
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ffi_status
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ffi_prep_cif_machdep (ffi_cif *cif)
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{
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/* Set the return type flag */
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switch (cif->rtype->type)
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{
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case FFI_TYPE_VOID:
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cif->flags = 0;
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break;
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case FFI_TYPE_STRUCT:
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if (cif->rtype->elements[0]->type == FFI_TYPE_STRUCT &&
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cif->rtype->elements[1])
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{
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cif->flags = 0;
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break;
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}
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if (cif->rtype->size == sizeof (char))
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cif->flags = CIF_FLAGS_CHAR;
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else if (cif->rtype->size == sizeof (short))
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cif->flags = CIF_FLAGS_SHORT;
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else if (cif->rtype->size == sizeof (int))
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cif->flags = CIF_FLAGS_INT;
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else if (cif->rtype->size == 2 * sizeof (int))
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cif->flags = CIF_FLAGS_DINT;
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else
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cif->flags = 0;
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break;
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default:
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if (cif->rtype->size <= sizeof (int))
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cif->flags = CIF_FLAGS_INT;
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else
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cif->flags = CIF_FLAGS_DINT;
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break;
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}
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return FFI_OK;
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}
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void
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ffi_call (ffi_cif *cif, void (*fn) (), void *rvalue, void **avalue)
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{
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extended_cif ecif;
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ecif.cif = cif;
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ecif.avalue = avalue;
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/* If the return value is a struct and we don't have a return value
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address then we need to make one. */
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if (rvalue == NULL
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&& cif->rtype->type == FFI_TYPE_STRUCT
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&& cif->flags == 0)
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ecif.rvalue = alloca (cif->rtype->size);
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else
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ecif.rvalue = rvalue;
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switch (cif->abi)
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{
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case FFI_ELFBSD:
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ffi_call_elfbsd (&ecif, cif->bytes, cif->flags, ecif.rvalue, fn);
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break;
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default:
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FFI_ASSERT (0);
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break;
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}
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}
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/*
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* Closure API
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*/
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void ffi_closure_elfbsd (void);
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void ffi_closure_struct_elfbsd (void);
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unsigned int ffi_closure_elfbsd_inner (ffi_closure *, void *, char *);
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static void
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ffi_prep_closure_elfbsd (ffi_cif *cif, void **avalue, char *stackp)
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{
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unsigned int i;
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void **p_argv;
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ffi_type **p_arg;
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p_argv = avalue;
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for (i = cif->nargs, p_arg = cif->arg_types; i != 0; i--, p_arg++)
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{
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size_t z;
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z = (*p_arg)->size;
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*p_argv = stackp;
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/* Align if necessary */
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if ((sizeof (int) - 1) & z)
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z = ALIGN(z, sizeof (int));
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p_argv++;
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stackp += z;
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}
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}
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unsigned int
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ffi_closure_elfbsd_inner (ffi_closure *closure, void *resp, char *stack)
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{
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ffi_cif *cif;
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void **arg_area;
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cif = closure->cif;
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arg_area = (void **) alloca (cif->nargs * sizeof (void *));
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ffi_prep_closure_elfbsd (cif, arg_area, stack);
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(closure->fun) (cif, resp, arg_area, closure->user_data);
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return cif->flags;
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}
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ffi_status
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ffi_prep_closure_loc (ffi_closure *closure, ffi_cif *cif,
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void (*fun)(ffi_cif *, void *, void **, void *),
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void *user_data, void *codeloc)
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{
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char *tramp = (char *) codeloc;
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void *fn;
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FFI_ASSERT (cif->abi == FFI_ELFBSD);
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/* entry mask */
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*(unsigned short *)(tramp + 0) = 0x0000;
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/* movl #closure, r0 */
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tramp[2] = 0xd0;
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tramp[3] = 0x8f;
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*(unsigned int *)(tramp + 4) = (unsigned int) closure;
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tramp[8] = 0x50;
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if (cif->rtype->type == FFI_TYPE_STRUCT
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&& !cif->flags)
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fn = &ffi_closure_struct_elfbsd;
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else
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fn = &ffi_closure_elfbsd;
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/* jmpl #fn */
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tramp[9] = 0x17;
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tramp[10] = 0xef;
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*(unsigned int *)(tramp + 11) = (unsigned int)fn + 2 -
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(unsigned int)tramp - 9 - 6;
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closure->cif = cif;
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closure->user_data = user_data;
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closure->fun = fun;
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return FFI_OK;
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}
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