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-rw-r--r--libffi.old/src/x86/ffi64.c706
1 files changed, 706 insertions, 0 deletions
diff --git a/libffi.old/src/x86/ffi64.c b/libffi.old/src/x86/ffi64.c
new file mode 100644
index 0000000..343ee92
--- /dev/null
+++ b/libffi.old/src/x86/ffi64.c
@@ -0,0 +1,706 @@
+/* -----------------------------------------------------------------------
+ ffi.c - Copyright (c) 2002 Bo Thorsen <bo@suse.de>
+
+ x86-64 Foreign Function Interface
+
+ 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 CYGNUS SOLUTIONS 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.
+ ----------------------------------------------------------------------- */
+
+#include <ffi.h>
+#include <ffi_common.h>
+
+#include <stdlib.h>
+#include <stdarg.h>
+
+/* ffi_prep_args is called by the assembly routine once stack space
+ has been allocated for the function's arguments */
+
+#ifdef __x86_64__
+
+#define MAX_GPR_REGS 6
+#define MAX_SSE_REGS 8
+typedef struct
+{
+ /* Registers for argument passing. */
+ long gpr[MAX_GPR_REGS];
+ __int128_t sse[MAX_SSE_REGS];
+
+ /* Stack space for arguments. */
+ char argspace[0];
+} stackLayout;
+
+/* All reference to register classes here is identical to the code in
+ gcc/config/i386/i386.c. Do *not* change one without the other. */
+
+/* Register class used for passing given 64bit part of the argument.
+ These represent classes as documented by the PS ABI, with the exception
+ of SSESF, SSEDF classes, that are basically SSE class, just gcc will
+ use SF or DFmode move instead of DImode to avoid reformating penalties.
+
+ Similary we play games with INTEGERSI_CLASS to use cheaper SImode moves
+ whenever possible (upper half does contain padding).
+ */
+enum x86_64_reg_class
+ {
+ X86_64_NO_CLASS,
+ X86_64_INTEGER_CLASS,
+ X86_64_INTEGERSI_CLASS,
+ X86_64_SSE_CLASS,
+ X86_64_SSESF_CLASS,
+ X86_64_SSEDF_CLASS,
+ X86_64_SSEUP_CLASS,
+ X86_64_X87_CLASS,
+ X86_64_X87UP_CLASS,
+ X86_64_MEMORY_CLASS
+ };
+
+#define MAX_CLASSES 4
+
+/* x86-64 register passing implementation. See x86-64 ABI for details. Goal
+ of this code is to classify each 8bytes of incoming argument by the register
+ class and assign registers accordingly. */
+
+/* Return the union class of CLASS1 and CLASS2.
+ See the x86-64 PS ABI for details. */
+
+static enum x86_64_reg_class
+merge_classes (enum x86_64_reg_class class1, enum x86_64_reg_class class2)
+{
+ /* Rule #1: If both classes are equal, this is the resulting class. */
+ if (class1 == class2)
+ return class1;
+
+ /* Rule #2: If one of the classes is NO_CLASS, the resulting class is
+ the other class. */
+ if (class1 == X86_64_NO_CLASS)
+ return class2;
+ if (class2 == X86_64_NO_CLASS)
+ return class1;
+
+ /* Rule #3: If one of the classes is MEMORY, the result is MEMORY. */
+ if (class1 == X86_64_MEMORY_CLASS || class2 == X86_64_MEMORY_CLASS)
+ return X86_64_MEMORY_CLASS;
+
+ /* Rule #4: If one of the classes is INTEGER, the result is INTEGER. */
+ if ((class1 == X86_64_INTEGERSI_CLASS && class2 == X86_64_SSESF_CLASS)
+ || (class2 == X86_64_INTEGERSI_CLASS && class1 == X86_64_SSESF_CLASS))
+ return X86_64_INTEGERSI_CLASS;
+ if (class1 == X86_64_INTEGER_CLASS || class1 == X86_64_INTEGERSI_CLASS
+ || class2 == X86_64_INTEGER_CLASS || class2 == X86_64_INTEGERSI_CLASS)
+ return X86_64_INTEGER_CLASS;
+
+ /* Rule #5: If one of the classes is X87 or X87UP class, MEMORY is used. */
+ if (class1 == X86_64_X87_CLASS || class1 == X86_64_X87UP_CLASS
+ || class2 == X86_64_X87_CLASS || class2 == X86_64_X87UP_CLASS)
+ return X86_64_MEMORY_CLASS;
+
+ /* Rule #6: Otherwise class SSE is used. */
+ return X86_64_SSE_CLASS;
+}
+
+/* Classify the argument of type TYPE and mode MODE.
+ CLASSES will be filled by the register class used to pass each word
+ of the operand. The number of words is returned. In case the parameter
+ should be passed in memory, 0 is returned. As a special case for zero
+ sized containers, classes[0] will be NO_CLASS and 1 is returned.
+
+ See the x86-64 PS ABI for details.
+*/
+static int
+classify_argument (ffi_type *type, enum x86_64_reg_class classes[],
+ int *byte_offset)
+{
+ /* First, align to the right place. */
+ *byte_offset = ALIGN(*byte_offset, type->alignment);
+
+ switch (type->type)
+ {
+ case FFI_TYPE_UINT8:
+ case FFI_TYPE_SINT8:
+ case FFI_TYPE_UINT16:
+ case FFI_TYPE_SINT16:
+ case FFI_TYPE_UINT32:
+ case FFI_TYPE_SINT32:
+ case FFI_TYPE_UINT64:
+ case FFI_TYPE_SINT64:
+ case FFI_TYPE_POINTER:
+ if (((*byte_offset) % 8 + type->size) <= 4)
+ classes[0] = X86_64_INTEGERSI_CLASS;
+ else
+ classes[0] = X86_64_INTEGER_CLASS;
+ return 1;
+ case FFI_TYPE_FLOAT:
+ if (((*byte_offset) % 8) == 0)
+ classes[0] = X86_64_SSESF_CLASS;
+ else
+ classes[0] = X86_64_SSE_CLASS;
+ return 1;
+ case FFI_TYPE_DOUBLE:
+ classes[0] = X86_64_SSEDF_CLASS;
+ return 1;
+ case FFI_TYPE_LONGDOUBLE:
+ classes[0] = X86_64_X87_CLASS;
+ classes[1] = X86_64_X87UP_CLASS;
+ return 2;
+ case FFI_TYPE_STRUCT:
+ {
+ const int UNITS_PER_WORD = 8;
+ int words = (type->size + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
+ ffi_type **ptr;
+ int i;
+ enum x86_64_reg_class subclasses[MAX_CLASSES];
+
+ /* If the struct is larger than 16 bytes, pass it on the stack. */
+ if (type->size > 16)
+ return 0;
+
+ for (i = 0; i < words; i++)
+ classes[i] = X86_64_NO_CLASS;
+
+ /* Merge the fields of structure. */
+ for (ptr=type->elements; (*ptr)!=NULL; ptr++)
+ {
+ int num;
+
+ num = classify_argument (*ptr, subclasses, byte_offset);
+ if (num == 0)
+ return 0;
+ for (i = 0; i < num; i++)
+ {
+ int pos = *byte_offset / 8;
+ classes[i + pos] =
+ merge_classes (subclasses[i], classes[i + pos]);
+ }
+
+ if ((*ptr)->type != FFI_TYPE_STRUCT)
+ *byte_offset += (*ptr)->size;
+ }
+
+ /* Final merger cleanup. */
+ for (i = 0; i < words; i++)
+ {
+ /* If one class is MEMORY, everything should be passed in
+ memory. */
+ if (classes[i] == X86_64_MEMORY_CLASS)
+ return 0;
+
+ /* The X86_64_SSEUP_CLASS should be always preceded by
+ X86_64_SSE_CLASS. */
+ if (classes[i] == X86_64_SSEUP_CLASS
+ && (i == 0 || classes[i - 1] != X86_64_SSE_CLASS))
+ classes[i] = X86_64_SSE_CLASS;
+
+ /* X86_64_X87UP_CLASS should be preceded by X86_64_X87_CLASS. */
+ if (classes[i] == X86_64_X87UP_CLASS
+ && (i == 0 || classes[i - 1] != X86_64_X87_CLASS))
+ classes[i] = X86_64_SSE_CLASS;
+ }
+ return words;
+ }
+
+ default:
+ FFI_ASSERT(0);
+ }
+ return 0; /* Never reached. */
+}
+
+/* Examine the argument and return set number of register required in each
+ class. Return 0 iff parameter should be passed in memory. */
+static int
+examine_argument (ffi_type *type, int in_return, int *int_nregs,int *sse_nregs)
+{
+ enum x86_64_reg_class class[MAX_CLASSES];
+ int offset = 0;
+ int n;
+
+ n = classify_argument (type, class, &offset);
+
+ if (n == 0)
+ return 0;
+
+ *int_nregs = 0;
+ *sse_nregs = 0;
+ for (n--; n>=0; n--)
+ switch (class[n])
+ {
+ case X86_64_INTEGER_CLASS:
+ case X86_64_INTEGERSI_CLASS:
+ (*int_nregs)++;
+ break;
+ case X86_64_SSE_CLASS:
+ case X86_64_SSESF_CLASS:
+ case X86_64_SSEDF_CLASS:
+ (*sse_nregs)++;
+ break;
+ case X86_64_NO_CLASS:
+ case X86_64_SSEUP_CLASS:
+ break;
+ case X86_64_X87_CLASS:
+ case X86_64_X87UP_CLASS:
+ if (!in_return)
+ return 0;
+ break;
+ default:
+ abort ();
+ }
+ return 1;
+}
+
+/* Functions to load floats and double to an SSE register placeholder. */
+extern void float2sse (float, __int128_t *);
+extern void double2sse (double, __int128_t *);
+extern void floatfloat2sse (void *, __int128_t *);
+
+/* Functions to put the floats and doubles back. */
+extern float sse2float (__int128_t *);
+extern double sse2double (__int128_t *);
+extern void sse2floatfloat(__int128_t *, void *);
+
+/*@-exportheader@*/
+void
+ffi_prep_args (stackLayout *stack, extended_cif *ecif)
+/*@=exportheader@*/
+{
+ int gprcount, ssecount, i, g, s;
+ void **p_argv;
+ void *argp = &stack->argspace;
+ ffi_type **p_arg;
+
+ /* First check if the return value should be passed in memory. If so,
+ pass the pointer as the first argument. */
+ gprcount = ssecount = 0;
+ if (ecif->cif->rtype->type != FFI_TYPE_VOID
+ && examine_argument (ecif->cif->rtype, 1, &g, &s) == 0)
+ stack->gpr[gprcount++] = (long) ecif->rvalue;
+
+ for (i=ecif->cif->nargs, p_arg=ecif->cif->arg_types, p_argv = ecif->avalue;
+ i!=0; i--, p_arg++, p_argv++)
+ {
+ int in_register = 0;
+
+ switch ((*p_arg)->type)
+ {
+ case FFI_TYPE_SINT8:
+ case FFI_TYPE_SINT16:
+ case FFI_TYPE_SINT32:
+ case FFI_TYPE_SINT64:
+ case FFI_TYPE_UINT8:
+ case FFI_TYPE_UINT16:
+ case FFI_TYPE_UINT32:
+ case FFI_TYPE_UINT64:
+ case FFI_TYPE_POINTER:
+ if (gprcount < MAX_GPR_REGS)
+ {
+ stack->gpr[gprcount] = 0;
+ stack->gpr[gprcount++] = *(long long *)(*p_argv);
+ in_register = 1;
+ }
+ break;
+
+ case FFI_TYPE_FLOAT:
+ if (ssecount < MAX_SSE_REGS)
+ {
+ float2sse (*(float *)(*p_argv), &stack->sse[ssecount++]);
+ in_register = 1;
+ }
+ break;
+
+ case FFI_TYPE_DOUBLE:
+ if (ssecount < MAX_SSE_REGS)
+ {
+ double2sse (*(double *)(*p_argv), &stack->sse[ssecount++]);
+ in_register = 1;
+ }
+ break;
+ }
+
+ if (in_register)
+ continue;
+
+ /* Either all places in registers where filled, or this is a
+ type that potentially goes into a memory slot. */
+ if (examine_argument (*p_arg, 0, &g, &s) == 0
+ || gprcount + g > MAX_GPR_REGS || ssecount + s > MAX_SSE_REGS)
+ {
+ /* Pass this argument in memory. */
+ argp = (void *)ALIGN(argp, (*p_arg)->alignment);
+ memcpy (argp, *p_argv, (*p_arg)->size);
+ argp += (*p_arg)->size;
+ }
+ else
+ {
+ /* All easy cases are eliminated. Now fire the big guns. */
+
+ enum x86_64_reg_class classes[MAX_CLASSES];
+ int offset = 0, j, num;
+ void *a;
+
+ num = classify_argument (*p_arg, classes, &offset);
+ for (j=0, a=*p_argv; j<num; j++, a+=8)
+ {
+ switch (classes[j])
+ {
+ case X86_64_INTEGER_CLASS:
+ case X86_64_INTEGERSI_CLASS:
+ stack->gpr[gprcount++] = *(long long *)a;
+ break;
+ case X86_64_SSE_CLASS:
+ floatfloat2sse (a, &stack->sse[ssecount++]);
+ break;
+ case X86_64_SSESF_CLASS:
+ float2sse (*(float *)a, &stack->sse[ssecount++]);
+ break;
+ case X86_64_SSEDF_CLASS:
+ double2sse (*(double *)a, &stack->sse[ssecount++]);
+ break;
+ default:
+ abort();
+ }
+ }
+ }
+ }
+}
+
+/* Perform machine dependent cif processing. */
+ffi_status
+ffi_prep_cif_machdep (ffi_cif *cif)
+{
+ int gprcount, ssecount, i, g, s;
+
+ gprcount = ssecount = 0;
+
+ /* Reset the byte count. We handle this size estimation here. */
+ cif->bytes = 0;
+
+ /* If the return value should be passed in memory, pass the pointer
+ as the first argument. The actual memory isn't allocated here. */
+ if (cif->rtype->type != FFI_TYPE_VOID
+ && examine_argument (cif->rtype, 1, &g, &s) == 0)
+ gprcount = 1;
+
+ /* Go over all arguments and determine the way they should be passed.
+ If it's in a register and there is space for it, let that be so. If
+ not, add it's size to the stack byte count. */
+ for (i=0; i<cif->nargs; i++)
+ {
+ if (examine_argument (cif->arg_types[i], 0, &g, &s) == 0
+ || gprcount + g > MAX_GPR_REGS || ssecount + s > MAX_SSE_REGS)
+ {
+ /* This is passed in memory. First align to the basic type. */
+ cif->bytes = ALIGN(cif->bytes, cif->arg_types[i]->alignment);
+
+ /* Stack arguments are *always* at least 8 byte aligned. */
+ cif->bytes = ALIGN(cif->bytes, 8);
+
+ /* Now add the size of this argument. */
+ cif->bytes += cif->arg_types[i]->size;
+ }
+ else
+ {
+ gprcount += g;
+ ssecount += s;
+ }
+ }
+
+ /* Set the flag for the closures return. */
+ switch (cif->rtype->type)
+ {
+ case FFI_TYPE_VOID:
+ case FFI_TYPE_STRUCT:
+ case FFI_TYPE_SINT64:
+ case FFI_TYPE_FLOAT:
+ case FFI_TYPE_DOUBLE:
+ case FFI_TYPE_LONGDOUBLE:
+ cif->flags = (unsigned) cif->rtype->type;
+ break;
+
+ case FFI_TYPE_UINT64:
+ cif->flags = FFI_TYPE_SINT64;
+ break;
+
+ default:
+ cif->flags = FFI_TYPE_INT;
+ break;
+ }
+
+ return FFI_OK;
+}
+
+typedef struct
+{
+ long gpr[2];
+ __int128_t sse[2];
+ long double st0;
+} return_value;
+
+void
+ffi_fill_return_value (return_value *rv, extended_cif *ecif)
+{
+ enum x86_64_reg_class classes[MAX_CLASSES];
+ int i = 0, num;
+ long *gpr = rv->gpr;
+ __int128_t *sse = rv->sse;
+ signed char sc;
+ signed short ss;
+
+ /* This is needed because of the way x86-64 handles signed short
+ integers. */
+ switch (ecif->cif->rtype->type)
+ {
+ case FFI_TYPE_SINT8:
+ sc = *(signed char *)gpr;
+ *(long long *)ecif->rvalue = (long long)sc;
+ return;
+ case FFI_TYPE_SINT16:
+ ss = *(signed short *)gpr;
+ *(long long *)ecif->rvalue = (long long)ss;
+ return;
+ default:
+ /* Just continue. */
+ ;
+ }
+
+ num = classify_argument (ecif->cif->rtype, classes, &i);
+
+ if (num == 0)
+ /* Return in memory. */
+ ecif->rvalue = (void *) rv->gpr[0];
+ else if (num == 2 && classes[0] == X86_64_X87_CLASS &&
+ classes[1] == X86_64_X87UP_CLASS)
+ /* This is a long double (this is easiest to handle this way instead
+ of an eightbyte at a time as in the loop below. */
+ *((long double *)ecif->rvalue) = rv->st0;
+ else
+ {
+ void *a;
+
+ for (i=0, a=ecif->rvalue; i<num; i++, a+=8)
+ {
+ switch (classes[i])
+ {
+ case X86_64_INTEGER_CLASS:
+ case X86_64_INTEGERSI_CLASS:
+ *(long long *)a = *gpr;
+ gpr++;
+ break;
+ case X86_64_SSE_CLASS:
+ sse2floatfloat (sse++, a);
+ break;
+ case X86_64_SSESF_CLASS:
+ *(float *)a = sse2float (sse++);
+ break;
+ case X86_64_SSEDF_CLASS:
+ *(double *)a = sse2double (sse++);
+ break;
+ default:
+ abort();
+ }
+ }
+ }
+}
+
+/*@-declundef@*/
+/*@-exportheader@*/
+extern void ffi_call_UNIX64(void (*)(stackLayout *, extended_cif *),
+ void (*) (return_value *, extended_cif *),
+ /*@out@*/ extended_cif *,
+ unsigned, /*@out@*/ unsigned *, void (*fn)());
+/*@=declundef@*/
+/*@=exportheader@*/
+
+void ffi_call(/*@dependent@*/ ffi_cif *cif,
+ void (*fn)(),
+ /*@out@*/ void *rvalue,
+ /*@dependent@*/ void **avalue)
+{
+ extended_cif ecif;
+ int dummy;
+
+ 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) &&
+ (examine_argument (cif->rtype, 1, &dummy, &dummy) == 0))
+ {
+ /*@-sysunrecog@*/
+ ecif.rvalue = alloca(cif->rtype->size);
+ /*@=sysunrecog@*/
+ }
+ else
+ ecif.rvalue = rvalue;
+
+ /* Stack must always be 16byte aligned. Make it so. */
+ cif->bytes = ALIGN(cif->bytes, 16);
+
+ switch (cif->abi)
+ {
+ case FFI_SYSV:
+ /* Calling 32bit code from 64bit is not possible */
+ FFI_ASSERT(0);
+ break;
+
+ case FFI_UNIX64:
+ /*@-usedef@*/
+ ffi_call_UNIX64 (ffi_prep_args, ffi_fill_return_value, &ecif,
+ cif->bytes, ecif.rvalue, fn);
+ /*@=usedef@*/
+ break;
+
+ default:
+ FFI_ASSERT(0);
+ break;
+ }
+}
+
+extern void ffi_closure_UNIX64(void);
+
+ffi_status
+ffi_prep_closure (ffi_closure* closure,
+ ffi_cif* cif,
+ void (*fun)(ffi_cif*, void*, void**, void*),
+ void *user_data)
+{
+ volatile unsigned short *tramp;
+
+ /* FFI_ASSERT (cif->abi == FFI_OSF); */
+
+ tramp = (volatile unsigned short *) &closure->tramp[0];
+ tramp[0] = 0xbb49; /* mov <code>, %r11 */
+ tramp[5] = 0xba49; /* mov <data>, %r10 */
+ tramp[10] = 0xff49; /* jmp *%r11 */
+ tramp[11] = 0x00e3;
+ *(void * volatile *) &tramp[1] = ffi_closure_UNIX64;
+ *(void * volatile *) &tramp[6] = closure;
+
+ closure->cif = cif;
+ closure->fun = fun;
+ closure->user_data = user_data;
+
+ return FFI_OK;
+}
+
+int
+ffi_closure_UNIX64_inner(ffi_closure *closure, va_list l, void *rp)
+{
+ ffi_cif *cif;
+ void **avalue;
+ ffi_type **arg_types;
+ long i, avn, argn;
+
+ cif = closure->cif;
+ avalue = alloca(cif->nargs * sizeof(void *));
+
+ argn = 0;
+
+ i = 0;
+ avn = cif->nargs;
+ arg_types = cif->arg_types;
+
+ /* Grab the addresses of the arguments from the stack frame. */
+ while (i < avn)
+ {
+ switch (arg_types[i]->type)
+ {
+ case FFI_TYPE_SINT8:
+ case FFI_TYPE_UINT8:
+ case FFI_TYPE_SINT16:
+ case FFI_TYPE_UINT16:
+ case FFI_TYPE_SINT32:
+ case FFI_TYPE_UINT32:
+ case FFI_TYPE_SINT64:
+ case FFI_TYPE_UINT64:
+ case FFI_TYPE_POINTER:
+ {
+ if (l->gp_offset > 48-8)
+ {
+ avalue[i] = l->overflow_arg_area;
+ l->overflow_arg_area = (char *)l->overflow_arg_area + 8;
+ }
+ else
+ {
+ avalue[i] = (char *)l->reg_save_area + l->gp_offset;
+ l->gp_offset += 8;
+ }
+ }
+ break;
+
+ case FFI_TYPE_STRUCT:
+ /* FIXME */
+ FFI_ASSERT(0);
+ break;
+
+ case FFI_TYPE_DOUBLE:
+ {
+ if (l->fp_offset > 176-16)
+ {
+ avalue[i] = l->overflow_arg_area;
+ l->overflow_arg_area = (char *)l->overflow_arg_area + 8;
+ }
+ else
+ {
+ avalue[i] = (char *)l->reg_save_area + l->fp_offset;
+ l->fp_offset += 16;
+ }
+ }
+#if DEBUG_FFI
+ fprintf (stderr, "double arg %d = %g\n", i, *(double *)avalue[i]);
+#endif
+ break;
+
+ case FFI_TYPE_FLOAT:
+ {
+ if (l->fp_offset > 176-16)
+ {
+ avalue[i] = l->overflow_arg_area;
+ l->overflow_arg_area = (char *)l->overflow_arg_area + 8;
+ }
+ else
+ {
+ avalue[i] = (char *)l->reg_save_area + l->fp_offset;
+ l->fp_offset += 16;
+ }
+ }
+#if DEBUG_FFI
+ fprintf (stderr, "float arg %d = %g\n", i, *(float *)avalue[i]);
+#endif
+ break;
+
+ default:
+ FFI_ASSERT(0);
+ }
+
+ argn += ALIGN(arg_types[i]->size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
+ i++;
+ }
+
+ /* Invoke the closure. */
+ (closure->fun) (cif, rp, avalue, closure->user_data);
+
+ /* FIXME: Structs not supported. */
+ FFI_ASSERT(cif->rtype->type != FFI_TYPE_STRUCT);
+
+ /* Tell ffi_closure_UNIX64 how to perform return type promotions. */
+
+ return cif->rtype->type;
+}
+#endif /* ifndef __x86_64__ */
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