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/* -----------------------------------------------------------------------
ffi.c
m68k Foreign Function Interface
----------------------------------------------------------------------- */
#include <ffi.h>
#include <ffi_common.h>
#include <stdlib.h>
#include <unistd.h>
#ifdef __rtems__
void rtems_cache_flush_multiple_data_lines( const void *, size_t );
#else
#include <sys/syscall.h>
#include <asm/cachectl.h>
#endif
void ffi_call_SYSV (extended_cif *,
unsigned, unsigned,
void *, void (*fn) ());
void *ffi_prep_args (void *stack, extended_cif *ecif);
void ffi_closure_SYSV (ffi_closure *);
void ffi_closure_struct_SYSV (ffi_closure *);
unsigned int ffi_closure_SYSV_inner (ffi_closure *closure,
void *resp, void *args);
/* 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;
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 + sizeof (int) - z, *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 = ALIGN(z, sizeof(int));
}
p_argv++;
argp += z;
}
return struct_value_ptr;
}
#define CIF_FLAGS_INT 1
#define CIF_FLAGS_DINT 2
#define CIF_FLAGS_FLOAT 4
#define CIF_FLAGS_DOUBLE 8
#define CIF_FLAGS_LDOUBLE 16
#define CIF_FLAGS_POINTER 32
#define CIF_FLAGS_STRUCT1 64
#define CIF_FLAGS_STRUCT2 128
/* 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:
switch (cif->rtype->size)
{
case 1:
cif->flags = CIF_FLAGS_STRUCT1;
break;
case 2:
cif->flags = CIF_FLAGS_STRUCT2;
break;
case 4:
cif->flags = CIF_FLAGS_INT;
break;
case 8:
cif->flags = CIF_FLAGS_DINT;
break;
default:
cif->flags = 0;
break;
}
break;
case FFI_TYPE_FLOAT:
cif->flags = CIF_FLAGS_FLOAT;
break;
case FFI_TYPE_DOUBLE:
cif->flags = CIF_FLAGS_DOUBLE;
break;
#if (FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE)
case FFI_TYPE_LONGDOUBLE:
cif->flags = CIF_FLAGS_LDOUBLE;
break;
#endif
case FFI_TYPE_POINTER:
cif->flags = CIF_FLAGS_POINTER;
break;
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 > 8)
ecif.rvalue = alloca (cif->rtype->size);
else
ecif.rvalue = rvalue;
switch (cif->abi)
{
case FFI_SYSV:
ffi_call_SYSV (&ecif, cif->bytes, cif->flags,
ecif.rvalue, fn);
break;
default:
FFI_ASSERT (0);
break;
}
}
static void
ffi_prep_incoming_args_SYSV (char *stack, void **avalue, ffi_cif *cif)
{
unsigned int i;
void **p_argv;
char *argp;
ffi_type **p_arg;
argp = stack;
p_argv = avalue;
for (i = cif->nargs, p_arg = cif->arg_types; (i != 0); i--, p_arg++)
{
size_t z;
z = (*p_arg)->size;
if (z <= 4)
{
*p_argv = (void *) (argp + 4 - z);
z = 4;
}
else
{
*p_argv = (void *) argp;
/* Align if necessary */
if ((sizeof(int) - 1) & z)
z = ALIGN(z, sizeof(int));
}
p_argv++;
argp += z;
}
}
unsigned int
ffi_closure_SYSV_inner (ffi_closure *closure, void *resp, void *args)
{
ffi_cif *cif;
void **arg_area;
cif = closure->cif;
arg_area = (void**) alloca (cif->nargs * sizeof (void *));
ffi_prep_incoming_args_SYSV(args, arg_area, cif);
(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)
{
FFI_ASSERT (cif->abi == FFI_SYSV);
*(unsigned short *)closure->tramp = 0x207c;
*(void **)(closure->tramp + 2) = codeloc;
*(unsigned short *)(closure->tramp + 6) = 0x4ef9;
if (cif->rtype->type == FFI_TYPE_STRUCT
&& !cif->flags)
*(void **)(closure->tramp + 8) = ffi_closure_struct_SYSV;
else
*(void **)(closure->tramp + 8) = ffi_closure_SYSV;
#ifdef __rtems__
rtems_cache_flush_multiple_data_lines( codeloc, FFI_TRAMPOLINE_SIZE );
#else
syscall(SYS_cacheflush, codeloc, FLUSH_SCOPE_LINE,
FLUSH_CACHE_BOTH, FFI_TRAMPOLINE_SIZE);
#endif
closure->cif = cif;
closure->user_data = user_data;
closure->fun = fun;
return FFI_OK;
}
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