/*
* 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.
*/
/*
* vax Foreign Function Interface
*
* This file attempts to provide all the FFI entry points which can reliably
* be implemented in C.
*/
#include <ffi.h>
#include <ffi_common.h>
#include <stdlib.h>
#include <unistd.h>
#define CIF_FLAGS_CHAR 1 /* for struct only */
#define CIF_FLAGS_SHORT 2 /* for struct only */
#define CIF_FLAGS_INT 4
#define CIF_FLAGS_DINT 8
/*
* Foreign Function Interface API
*/
void ffi_call_elfbsd (extended_cif *, unsigned, unsigned, void *,
void (*) ());
void *ffi_prep_args (extended_cif *ecif, void *stack);
void *
ffi_prep_args (extended_cif *ecif, void *stack)
{
unsigned int i;
void **p_argv;
char *argp;
ffi_type **p_arg;
void *struct_value_ptr;
argp = stack;
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;
z = (*p_arg)->size;
if (z < sizeof (int))
{
switch ((*p_arg)->type)
{
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_STRUCT:
memcpy (argp, *p_argv, z);
break;
default:
FFI_ASSERT (0);
}
z = sizeof (int);
}
else
{
memcpy (argp, *p_argv, z);
/* Align if necessary. */
if ((sizeof(int) - 1) & z)
z = FFI_ALIGN(z, sizeof(int));
}
p_argv++;
argp += z;
}
return struct_value_ptr;
}
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->elements[0]->type == FFI_TYPE_STRUCT &&
cif->rtype->elements[1])
{
cif->flags = 0;
break;
}
if (cif->rtype->size == sizeof (char))
cif->flags = CIF_FLAGS_CHAR;
else if (cif->rtype->size == sizeof (short))
cif->flags = CIF_FLAGS_SHORT;
else if (cif->rtype->size == sizeof (int))
cif->flags = CIF_FLAGS_INT;
else if (cif->rtype->size == 2 * sizeof (int))
cif->flags = CIF_FLAGS_DINT;
else
cif->flags = 0;
break;
default:
if (cif->rtype->size <= sizeof (int))
cif->flags = CIF_FLAGS_INT;
else
cif->flags = CIF_FLAGS_DINT;
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->flags == 0)
ecif.rvalue = alloca (cif->rtype->size);
else
ecif.rvalue = rvalue;
switch (cif->abi)
{
case FFI_ELFBSD:
ffi_call_elfbsd (&ecif, cif->bytes, cif->flags, ecif.rvalue, fn);
break;
default:
FFI_ASSERT (0);
break;
}
}
/*
* Closure API
*/
void ffi_closure_elfbsd (void);
void ffi_closure_struct_elfbsd (void);
unsigned int ffi_closure_elfbsd_inner (ffi_closure *, void *, char *);
static void
ffi_prep_closure_elfbsd (ffi_cif *cif, void **avalue, char *stackp)
{
unsigned int i;
void **p_argv;
ffi_type **p_arg;
p_argv = avalue;
for (i = cif->nargs, p_arg = cif->arg_types; i != 0; i--, p_arg++)
{
size_t z;
z = (*p_arg)->size;
*p_argv = stackp;
/* Align if necessary */
if ((sizeof (int) - 1) & z)
z = FFI_ALIGN(z, sizeof (int));
p_argv++;
stackp += z;
}
}
unsigned int
ffi_closure_elfbsd_inner (ffi_closure *closure, void *resp, char *stack)
{
ffi_cif *cif;
void **arg_area;
cif = closure->cif;
arg_area = (void **) alloca (cif->nargs * sizeof (void *));
ffi_prep_closure_elfbsd (cif, arg_area, stack);
(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)
{
char *tramp = (char *) codeloc;
void *fn;
FFI_ASSERT (cif->abi == FFI_ELFBSD);
/* entry mask */
*(unsigned short *)(tramp + 0) = 0x0000;
/* movl #closure, r0 */
tramp[2] = 0xd0;
tramp[3] = 0x8f;
*(unsigned int *)(tramp + 4) = (unsigned int) closure;
tramp[8] = 0x50;
if (cif->rtype->type == FFI_TYPE_STRUCT
&& !cif->flags)
fn = &ffi_closure_struct_elfbsd;
else
fn = &ffi_closure_elfbsd;
/* jmpl #fn */
tramp[9] = 0x17;
tramp[10] = 0xef;
*(unsigned int *)(tramp + 11) = (unsigned int)fn + 2 -
(unsigned int)tramp - 9 - 6;
closure->cif = cif;
closure->user_data = user_data;
closure->fun = fun;
return FFI_OK;
}
