+++ /dev/null
-/* -----------------------------------------------------------------------
- ffi.c - Copyright (c) 1996, 1998, 1999 Cygnus Solutions
-
- x86 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>
-
-/* ffi_prep_args is called by the assembly routine once stack space
- has been allocated for the function's arguments */
-
-/*@-exportheader@*/
-void ffi_prep_args(char *stack, extended_cif *ecif)
-/*@=exportheader@*/
-{
- register unsigned int i;
- register int tmp;
- register void **p_argv;
- register char *argp;
- register ffi_type **p_arg;
-
- tmp = 0;
- argp = stack;
-
- if (ecif->cif->rtype->type == FFI_TYPE_STRUCT)
- {
- *(void **) argp = ecif->rvalue;
- argp += 4;
- }
-
- p_argv = ecif->avalue;
-
- for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types;
- i != 0;
- i--, p_arg++)
- {
- size_t z;
-
- /* Align if necessary */
- if (((*p_arg)->alignment - 1) & (unsigned) argp)
- argp = (char *) ALIGN(argp, (*p_arg)->alignment);
-
- z = (*p_arg)->size;
- if (z < sizeof(int))
- {
- 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_SINT32:
- *(signed int *) argp = (signed int)*(SINT32 *)(* p_argv);
- break;
-
- case FFI_TYPE_UINT32:
- *(unsigned int *) argp = (unsigned int)*(UINT32 *)(* p_argv);
- break;
-
- case FFI_TYPE_STRUCT:
- *(unsigned int *) argp = (unsigned int)*(UINT32 *)(* p_argv);
- break;
-
- default:
- FFI_ASSERT(0);
- }
- }
- else
- {
- memcpy(argp, *p_argv, z);
- }
- p_argv++;
- argp += z;
- }
-
- return;
-}
-
-/* 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:
- 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;
-}
-
-/*@-declundef@*/
-/*@-exportheader@*/
-extern void ffi_call_SYSV(void (*)(char *, extended_cif *),
- /*@out@*/ extended_cif *,
- unsigned, 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;
-
- 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))
- {
- /*@-sysunrecog@*/
- ecif.rvalue = alloca(cif->rtype->size);
- /*@=sysunrecog@*/
- }
- else
- ecif.rvalue = rvalue;
-
-
- switch (cif->abi)
- {
- case FFI_SYSV:
- /*@-usedef@*/
- ffi_call_SYSV(ffi_prep_args, &ecif, cif->bytes,
- cif->flags, ecif.rvalue, fn);
- /*@=usedef@*/
- break;
- default:
- FFI_ASSERT(0);
- break;
- }
-}
-
-
-/** private members **/
-
-static void ffi_prep_incoming_args_SYSV (char *stack, void **ret,
- void** args, ffi_cif* cif);
-static void ffi_closure_SYSV ();
-static void ffi_closure_raw_SYSV ();
-
-/* This function is jumped to by the trampoline, on entry, %ecx (a
- * caller-save register) holds the address of the closure.
- * Clearly, this requires __GNUC__, so perhaps we should translate this
- * into an assembly file if this is to be distributed with ffi.
- */
-
-static void
-ffi_closure_SYSV ()
-{
- // this is our return value storage
- long double res;
-
- // our various things...
- void *args;
- ffi_cif *cif;
- void **arg_area;
- ffi_closure *closure;
- unsigned short rtype;
- void *resp = (void*)&res;
-
- /* grab the trampoline context pointer */
- asm ("movl %%ecx,%0" : "=r" (closure));
-
- cif = closure->cif;
- arg_area = (void**) alloca (cif->nargs * sizeof (void*));
- asm ("leal 8(%%ebp),%0" : "=q" (args));
-
- /* this call will initialize ARG_AREA, such that each
- * element in that array points to the corresponding
- * value on the stack; and if the function returns
- * a structure, it will re-set RESP to point to the
- * structure return address. */
-
- ffi_prep_incoming_args_SYSV(args, (void**)&resp, arg_area, cif);
-
- (closure->fun) (cif, resp, arg_area, closure->user_data);
-
- rtype = cif->flags;
-
- /* now, do a generic return based on the value of rtype */
- if (rtype == FFI_TYPE_INT)
- {
- asm ("movl (%0),%%eax" : : "r" (resp) : "eax");
- }
- else if (rtype == FFI_TYPE_FLOAT)
- {
- asm ("flds (%0)" : : "r" (resp) : "st" );
- }
- else if (rtype == FFI_TYPE_DOUBLE)
- {
- asm ("fldl (%0)" : : "r" (resp) : "st", "st(1)" );
- }
- else if (rtype == FFI_TYPE_LONGDOUBLE)
- {
- asm ("fldt (%0)" : : "r" (resp) : "st", "st(1)" );
- }
- else if (rtype == FFI_TYPE_SINT64)
- {
- asm ("movl 0(%0),%%eax;"
- "movl 4(%0),%%edx"
- : : "r"(resp)
- : "eax", "edx");
- }
-}
-
-/*@-exportheader@*/
-static void
-ffi_prep_incoming_args_SYSV(char *stack, void **rvalue,
- void **avalue, ffi_cif *cif)
-/*@=exportheader@*/
-{
- register unsigned int i;
- register int tmp;
- register void **p_argv;
- register char *argp;
- register ffi_type **p_arg;
-
- tmp = 0;
- argp = stack;
-
- if ( cif->rtype->type == FFI_TYPE_STRUCT ) {
- *rvalue = *(void **) argp;
- argp += 4;
- }
-
- p_argv = avalue;
-
- for (i = cif->nargs, p_arg = cif->arg_types; i != 0; i--, p_arg++)
- {
- size_t z;
-
- /* Align if necessary */
- if (((*p_arg)->alignment - 1) & (unsigned) argp)
- argp = (char *) ALIGN(argp, (*p_arg)->alignment);
-
- z = (*p_arg)->size;
-
- /* because we're little endian, this is what it turns into. */
-
- *p_argv = (void*) argp;
-
- p_argv++;
- argp += z;
- }
-
- return;
-}
-
-/* How to make a trampoline. Derived from gcc/config/i386/i386.c. */
-
-#define FFI_INIT_TRAMPOLINE(TRAMP,FUN,CTX) \
-({ unsigned char *__tramp = (unsigned char*)(TRAMP); \
- unsigned int __fun = (unsigned int)(FUN); \
- unsigned int __ctx = (unsigned int)(CTX); \
- unsigned int __dis = __fun - ((unsigned int) __tramp + 10); \
- *(unsigned char*) &__tramp[0] = 0xb9; \
- *(unsigned int*) &__tramp[1] = __ctx; \
- *(unsigned char*) &__tramp[5] = 0xe9; \
- *(unsigned int*) &__tramp[6] = __dis; \
- })
-
-
-/* the cif must already be prep'ed */
-
-ffi_status
-ffi_prep_closure (ffi_closure* closure,
- ffi_cif* cif,
- void (*fun)(ffi_cif*,void*,void**,void*),
- void *user_data)
-{
- FFI_ASSERT (cif->abi == FFI_SYSV);
-
- FFI_INIT_TRAMPOLINE (&closure->tramp[0], \
- &ffi_closure_SYSV, \
- (void*)closure);
-
- closure->cif = cif;
- closure->user_data = user_data;
- closure->fun = fun;
-
- return FFI_OK;
-}
-
-/* ------- Native raw API support -------------------------------- */
-
-#if !FFI_NO_RAW_API
-
-static void
-ffi_closure_raw_SYSV ()
-{
- // this is our return value storage
- long double res;
-
- // our various things...
- void *args;
- ffi_raw *raw_args;
- ffi_cif *cif;
- ffi_raw_closure *closure;
- unsigned short rtype;
- void *resp = (void*)&res;
-
- /* grab the trampoline context pointer */
- asm ("movl %%ecx,%0" : "=r" (closure));
-
- /* take the argument pointer */
- asm ("leal 8(%%ebp),%0" : "=q" (args));
-
- /* get the cif */
- cif = closure->cif;
-
- /* the SYSV/X86 abi matches the RAW API exactly, well.. almost */
- raw_args = (ffi_raw*) args;
-
- (closure->fun) (cif, resp, raw_args, closure->user_data);
-
- rtype = cif->flags;
-
- /* now, do a generic return based on the value of rtype */
- if (rtype == FFI_TYPE_INT)
- {
- asm ("movl (%0),%%eax" : : "r" (resp) : "eax");
- }
- else if (rtype == FFI_TYPE_FLOAT)
- {
- asm ("flds (%0)" : : "r" (resp) : "st" );
- }
- else if (rtype == FFI_TYPE_DOUBLE)
- {
- asm ("fldl (%0)" : : "r" (resp) : "st", "st(1)" );
- }
- else if (rtype == FFI_TYPE_LONGDOUBLE)
- {
- asm ("fldt (%0)" : : "r" (resp) : "st", "st(1)" );
- }
- else if (rtype == FFI_TYPE_SINT64)
- {
- asm ("movl 0(%0),%%eax; movl 4(%0),%%edx"
- : : "r"(resp)
- : "eax", "edx");
- }
-}
-
-
-
-
-ffi_status
-ffi_prep_raw_closure (ffi_raw_closure* closure,
- ffi_cif* cif,
- void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
- void *user_data)
-{
- int i;
-
- FFI_ASSERT (cif->abi == FFI_SYSV);
-
- // we currently don't support certain kinds of arguments for raw
- // closures. This should be implemented by a separate assembly language
- // routine, since it would require argument processing, something we
- // don't do now for performance.
-
- for (i = cif->nargs-1; i >= 0; i--)
- {
- FFI_ASSERT (cif->arg_types[i]->type != FFI_TYPE_STRUCT);
- FFI_ASSERT (cif->arg_types[i]->type != FFI_TYPE_LONGDOUBLE);
- }
-
-
- FFI_INIT_TRAMPOLINE (&closure->tramp[0], &ffi_closure_raw_SYSV,
- (void*)closure);
-
- closure->cif = cif;
- closure->user_data = user_data;
- closure->fun = fun;
-
- return FFI_OK;
-}
-
-static void
-ffi_prep_args_raw(char *stack, extended_cif *ecif)
-{
- memcpy (stack, ecif->avalue, ecif->cif->bytes);
-}
-
-/* we borrow this routine from libffi (it must be changed, though, to
- * actually call the function passed in the first argument. as of
- * libffi-1.20, this is not the case.)
- */
-
-extern void
-ffi_call_SYSV(void (*)(char *, extended_cif *),
- /*@out@*/ extended_cif *,
- unsigned, unsigned,
- /*@out@*/ unsigned *,
- void (*fn)());
-
-void
-ffi_raw_call(/*@dependent@*/ ffi_cif *cif,
- void (*fn)(),
- /*@out@*/ void *rvalue,
- /*@dependent@*/ ffi_raw *fake_avalue)
-{
- extended_cif ecif;
- void **avalue = (void **)fake_avalue;
-
- 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))
- {
- /*@-sysunrecog@*/
- ecif.rvalue = alloca(cif->rtype->size);
- /*@=sysunrecog@*/
- }
- else
- ecif.rvalue = rvalue;
-
-
- switch (cif->abi)
- {
- case FFI_SYSV:
- /*@-usedef@*/
- ffi_call_SYSV(ffi_prep_args_raw, &ecif, cif->bytes,
- cif->flags, ecif.rvalue, fn);
- /*@=usedef@*/
- break;
- default:
- FFI_ASSERT(0);
- break;
- }
-}
-
-#endif
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