+++ /dev/null
-/* -----------------------------------------------------------------------
- ffi.c - Copyright (c) 1996, 1998, 1999, 2001, 2007, 2008 Red Hat, Inc.
- Copyright (c) 2002 Ranjit Mathew
- Copyright (c) 2002 Bo Thorsen
- Copyright (c) 2002 Roger Sayle
- Copyright (C) 2008 Free Software Foundation, Inc.
-
- 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 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.
- ----------------------------------------------------------------------- */
-
-#if !defined(__x86_64__) || defined(_WIN64)
-
-#ifdef _WIN64
-#include <windows.h>
-#endif
-
-#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 */
-
-void ffi_prep_args(char *stack, extended_cif *ecif)
-{
- register unsigned int i;
- register void **p_argv;
- register char *argp;
- register ffi_type **p_arg;
-
- argp = stack;
-
- if (ecif->cif->flags == FFI_TYPE_STRUCT
-#ifdef X86_WIN64
- && (ecif->cif->rtype->size != 1 && ecif->cif->rtype->size != 2
- && ecif->cif->rtype->size != 4 && ecif->cif->rtype->size != 8)
-#endif
- )
- {
- *(void **) argp = ecif->rvalue;
- argp += sizeof(void*);
- }
-
- 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 ((sizeof(void*) - 1) & (size_t) argp)
- argp = (char *) ALIGN(argp, sizeof(void*));
-
- z = (*p_arg)->size;
-#ifdef X86_WIN64
- if (z > sizeof(ffi_arg)
- || ((*p_arg)->type == FFI_TYPE_STRUCT
- && (z != 1 && z != 2 && z != 4 && z != 8))
-#if FFI_TYPE_DOUBLE != FFI_TYPE_LONGDOUBLE
- || ((*p_arg)->type == FFI_TYPE_LONGDOUBLE)
-#endif
- )
- {
- z = sizeof(ffi_arg);
- *(void **)argp = *p_argv;
- }
- else if ((*p_arg)->type == FFI_TYPE_FLOAT)
- {
- memcpy(argp, *p_argv, z);
- }
- else
-#endif
- if (z < sizeof(ffi_arg))
- {
- z = sizeof(ffi_arg);
- switch ((*p_arg)->type)
- {
- case FFI_TYPE_SINT8:
- *(ffi_sarg *) argp = (ffi_sarg)*(SINT8 *)(* p_argv);
- break;
-
- case FFI_TYPE_UINT8:
- *(ffi_arg *) argp = (ffi_arg)*(UINT8 *)(* p_argv);
- break;
-
- case FFI_TYPE_SINT16:
- *(ffi_sarg *) argp = (ffi_sarg)*(SINT16 *)(* p_argv);
- break;
-
- case FFI_TYPE_UINT16:
- *(ffi_arg *) argp = (ffi_arg)*(UINT16 *)(* p_argv);
- break;
-
- case FFI_TYPE_SINT32:
- *(ffi_sarg *) argp = (ffi_sarg)*(SINT32 *)(* p_argv);
- break;
-
- case FFI_TYPE_UINT32:
- *(ffi_arg *) argp = (ffi_arg)*(UINT32 *)(* p_argv);
- break;
-
- case FFI_TYPE_STRUCT:
- *(ffi_arg *) argp = *(ffi_arg *)(* p_argv);
- break;
-
- default:
- FFI_ASSERT(0);
- }
- }
- else
- {
- memcpy(argp, *p_argv, z);
- }
- p_argv++;
-#ifdef X86_WIN64
- argp += (z + sizeof(void*) - 1) & ~(sizeof(void*) - 1);
-#else
- argp += z;
-#endif
- }
-
- return;
-}
-
-/* Perform machine dependent cif processing */
-ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
-{
- unsigned int i;
- ffi_type **ptr;
-
- /* Set the return type flag */
- switch (cif->rtype->type)
- {
- case FFI_TYPE_VOID:
-#if defined(X86) || defined (X86_WIN32) || defined(X86_FREEBSD) || defined(X86_DARWIN) || defined(X86_WIN64)
- case FFI_TYPE_UINT8:
- case FFI_TYPE_UINT16:
- case FFI_TYPE_SINT8:
- case FFI_TYPE_SINT16:
-#endif
-#ifdef X86_WIN64
- case FFI_TYPE_UINT32:
- case FFI_TYPE_SINT32:
-#endif
- case FFI_TYPE_SINT64:
- case FFI_TYPE_FLOAT:
- case FFI_TYPE_DOUBLE:
-#ifndef X86_WIN64
-#if FFI_TYPE_DOUBLE != FFI_TYPE_LONGDOUBLE
- case FFI_TYPE_LONGDOUBLE:
-#endif
-#endif
- cif->flags = (unsigned) cif->rtype->type;
- break;
-
- case FFI_TYPE_UINT64:
-#ifdef X86_WIN64
- case FFI_TYPE_POINTER:
-#endif
- cif->flags = FFI_TYPE_SINT64;
- break;
-
- case FFI_TYPE_STRUCT:
-#ifndef X86
- if (cif->rtype->size == 1)
- {
- cif->flags = FFI_TYPE_SMALL_STRUCT_1B; /* same as char size */
- }
- else if (cif->rtype->size == 2)
- {
- cif->flags = FFI_TYPE_SMALL_STRUCT_2B; /* same as short size */
- }
- else if (cif->rtype->size == 4)
- {
-#ifdef X86_WIN64
- cif->flags = FFI_TYPE_SMALL_STRUCT_4B;
-#else
- cif->flags = FFI_TYPE_INT; /* same as int type */
-#endif
- }
- else if (cif->rtype->size == 8)
- {
- cif->flags = FFI_TYPE_SINT64; /* same as int64 type */
- }
- else
-#endif
- {
- cif->flags = FFI_TYPE_STRUCT;
- // allocate space for return value pointer
- cif->bytes += ALIGN(sizeof(void*), FFI_SIZEOF_ARG);
- }
- break;
-
- default:
-#ifdef X86_WIN64
- cif->flags = FFI_TYPE_SINT64;
- break;
- case FFI_TYPE_INT:
- cif->flags = FFI_TYPE_SINT32;
-#else
- cif->flags = FFI_TYPE_INT;
-#endif
- break;
- }
-
- for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
- {
- if (((*ptr)->alignment - 1) & cif->bytes)
- cif->bytes = ALIGN(cif->bytes, (*ptr)->alignment);
- cif->bytes += ALIGN((*ptr)->size, FFI_SIZEOF_ARG);
- }
-
-#ifdef X86_WIN64
- // ensure space for storing four registers
- cif->bytes += 4 * sizeof(ffi_arg);
-#endif
-
-#ifdef X86_DARWIN
- cif->bytes = (cif->bytes + 15) & ~0xF;
-#endif
-
- return FFI_OK;
-}
-
-#ifdef X86_WIN64
-extern int
-ffi_call_win64(void (*)(char *, extended_cif *), extended_cif *,
- unsigned, unsigned, unsigned *, void (*fn)(void));
-#elif defined(X86_WIN32)
-extern void
-ffi_call_win32(void (*)(char *, extended_cif *), extended_cif *,
- unsigned, unsigned, unsigned *, void (*fn)(void));
-#else
-extern void ffi_call_SYSV(void (*)(char *, extended_cif *), extended_cif *,
- unsigned, unsigned, unsigned *, void (*fn)(void));
-#endif
-
-void ffi_call(ffi_cif *cif, void (*fn)(void), 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 */
-
-#ifdef X86_WIN64
- if (rvalue == NULL
- && cif->flags == FFI_TYPE_STRUCT
- && cif->rtype->size != 1 && cif->rtype->size != 2
- && cif->rtype->size != 4 && cif->rtype->size != 8)
- {
- ecif.rvalue = alloca((cif->rtype->size + 0xF) & ~0xF);
- }
-#else
- if (rvalue == NULL
- && cif->flags == FFI_TYPE_STRUCT)
- {
- ecif.rvalue = alloca(cif->rtype->size);
- }
-#endif
- else
- ecif.rvalue = rvalue;
-
-
- switch (cif->abi)
- {
-#ifdef X86_WIN64
- case FFI_WIN64:
- {
- // Make copies of all struct arguments
- // NOTE: not sure if responsibility should be here or in caller
- unsigned int i;
- for (i=0; i < cif->nargs;i++) {
- size_t size = cif->arg_types[i]->size;
- if ((cif->arg_types[i]->type == FFI_TYPE_STRUCT
- && (size != 1 && size != 2 && size != 4 && size != 8))
-#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
- || cif->arg_types[i]->type == FFI_TYPE_LONGDOUBLE
-#endif
- )
- {
- void *local = alloca(size);
- memcpy(local, avalue[i], size);
- avalue[i] = local;
- }
- }
- ffi_call_win64(ffi_prep_args, &ecif, cif->bytes,
- cif->flags, ecif.rvalue, fn);
- }
- break;
-#elif defined(X86_WIN32)
- case FFI_SYSV:
- case FFI_STDCALL:
- ffi_call_win32(ffi_prep_args, &ecif, cif->bytes, cif->flags,
- ecif.rvalue, fn);
- break;
-#else
- case FFI_SYSV:
- ffi_call_SYSV(ffi_prep_args, &ecif, cif->bytes, cif->flags, ecif.rvalue,
- fn);
- break;
-#endif
- default:
- FFI_ASSERT(0);
- break;
- }
-}
-
-
-/** private members **/
-
-/* The following __attribute__((regparm(1))) decorations will have no effect
- on MSVC - standard cdecl convention applies. */
-static void ffi_prep_incoming_args_SYSV (char *stack, void **ret,
- void** args, ffi_cif* cif);
-void FFI_HIDDEN ffi_closure_SYSV (ffi_closure *)
- __attribute__ ((regparm(1)));
-unsigned int FFI_HIDDEN ffi_closure_SYSV_inner (ffi_closure *, void **, void *)
- __attribute__ ((regparm(1)));
-void FFI_HIDDEN ffi_closure_raw_SYSV (ffi_raw_closure *)
- __attribute__ ((regparm(1)));
-#ifdef X86_WIN32
-void FFI_HIDDEN ffi_closure_STDCALL (ffi_closure *)
- __attribute__ ((regparm(1)));
-#endif
-#ifdef X86_WIN64
-void FFI_HIDDEN ffi_closure_win64 (ffi_closure *);
-#endif
-
-/* This function is jumped to by the trampoline */
-
-#ifdef X86_WIN64
-void * FFI_HIDDEN
-ffi_closure_win64_inner (ffi_closure *closure, void *args) {
- ffi_cif *cif;
- void **arg_area;
- void *result;
- void *resp = &result;
-
- cif = closure->cif;
- arg_area = (void**) alloca (cif->nargs * sizeof (void*));
-
- /* 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 change RESP to point to the
- * structure return address. */
-
- ffi_prep_incoming_args_SYSV(args, &resp, arg_area, cif);
-
- (closure->fun) (cif, resp, arg_area, closure->user_data);
-
- /* The result is returned in rax. This does the right thing for
- result types except for floats; we have to 'mov xmm0, rax' in the
- caller to correct this.
- TODO: structure sizes of 3 5 6 7 are returned by reference, too!!!
- */
- return cif->rtype->size > sizeof(void *) ? resp : *(void **)resp;
-}
-
-#else
-unsigned int FFI_HIDDEN __attribute__ ((regparm(1)))
-ffi_closure_SYSV_inner (ffi_closure *closure, void **respp, void *args)
-{
- /* our various things... */
- ffi_cif *cif;
- void **arg_area;
-
- cif = closure->cif;
- arg_area = (void**) alloca (cif->nargs * sizeof (void*));
-
- /* 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 change RESP to point to the
- * structure return address. */
-
- ffi_prep_incoming_args_SYSV(args, respp, arg_area, cif);
-
- (closure->fun) (cif, *respp, arg_area, closure->user_data);
-
- return cif->flags;
-}
-#endif /* !X86_WIN64 */
-
-static void
-ffi_prep_incoming_args_SYSV(char *stack, void **rvalue, void **avalue,
- ffi_cif *cif)
-{
- register unsigned int i;
- register void **p_argv;
- register char *argp;
- register ffi_type **p_arg;
-
- argp = stack;
-
-#ifdef X86_WIN64
- if (cif->rtype->size > sizeof(ffi_arg)
- || (cif->flags == FFI_TYPE_STRUCT
- && (cif->rtype->size != 1 && cif->rtype->size != 2
- && cif->rtype->size != 4 && cif->rtype->size != 8))) {
- *rvalue = *(void **) argp;
- argp += sizeof(void *);
- }
-#else
- if ( cif->flags == FFI_TYPE_STRUCT ) {
- *rvalue = *(void **) argp;
- argp += sizeof(void *);
- }
-#endif
-
- p_argv = avalue;
-
- for (i = cif->nargs, p_arg = cif->arg_types; (i != 0); i--, p_arg++)
- {
- size_t z;
-
- /* Align if necessary */
- if ((sizeof(void*) - 1) & (size_t) argp) {
- argp = (char *) ALIGN(argp, sizeof(void*));
- }
-
-#ifdef X86_WIN64
- if ((*p_arg)->size > sizeof(ffi_arg)
- || ((*p_arg)->type == FFI_TYPE_STRUCT
- && ((*p_arg)->size != 1 && (*p_arg)->size != 2
- && (*p_arg)->size != 4 && (*p_arg)->size != 8)))
- {
- z = sizeof(void *);
- *p_argv = *(void **)argp;
- }
- else
-#endif
- {
- z = (*p_arg)->size;
-
- /* because we're little endian, this is what it turns into. */
-
- *p_argv = (void*) argp;
- }
-
- p_argv++;
-#ifdef X86_WIN64
- argp += (z + sizeof(void*) - 1) & ~(sizeof(void*) - 1);
-#else
- argp += z;
-#endif
- }
-
- return;
-}
-
-#define FFI_INIT_TRAMPOLINE_WIN64(TRAMP,FUN,CTX,MASK) \
-{ unsigned char *__tramp = (unsigned char*)(TRAMP); \
- void* __fun = (void*)(FUN); \
- void* __ctx = (void*)(CTX); \
- *(unsigned char*) &__tramp[0] = 0x41; \
- *(unsigned char*) &__tramp[1] = 0xbb; \
- *(unsigned int*) &__tramp[2] = MASK; /* mov $mask, %r11 */ \
- *(unsigned char*) &__tramp[6] = 0x48; \
- *(unsigned char*) &__tramp[7] = 0xb8; \
- *(void**) &__tramp[8] = __ctx; /* mov __ctx, %rax */ \
- *(unsigned char *) &__tramp[16] = 0x49; \
- *(unsigned char *) &__tramp[17] = 0xba; \
- *(void**) &__tramp[18] = __fun; /* mov __fun, %r10 */ \
- *(unsigned char *) &__tramp[26] = 0x41; \
- *(unsigned char *) &__tramp[27] = 0xff; \
- *(unsigned char *) &__tramp[28] = 0xe2; /* jmp %r10 */ \
- }
-
-/* 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 - (__ctx + 10); \
- *(unsigned char*) &__tramp[0] = 0xb8; \
- *(unsigned int*) &__tramp[1] = __ctx; /* movl __ctx, %eax */ \
- *(unsigned char *) &__tramp[5] = 0xe9; \
- *(unsigned int*) &__tramp[6] = __dis; /* jmp __fun */ \
- }
-
-#define FFI_INIT_TRAMPOLINE_STDCALL(TRAMP,FUN,CTX,SIZE) \
-{ unsigned char *__tramp = (unsigned char*)(TRAMP); \
- unsigned int __fun = (unsigned int)(FUN); \
- unsigned int __ctx = (unsigned int)(CTX); \
- unsigned int __dis = __fun - (__ctx + 10); \
- unsigned short __size = (unsigned short)(SIZE); \
- *(unsigned char*) &__tramp[0] = 0xb8; \
- *(unsigned int*) &__tramp[1] = __ctx; /* movl __ctx, %eax */ \
- *(unsigned char *) &__tramp[5] = 0xe8; \
- *(unsigned int*) &__tramp[6] = __dis; /* call __fun */ \
- *(unsigned char *) &__tramp[10] = 0xc2; \
- *(unsigned short*) &__tramp[11] = __size; /* ret __size */ \
- }
-
-/* the cif must already be prep'ed */
-
-ffi_status
-ffi_prep_closure_loc (ffi_closure* closure,
- ffi_cif* cif,
- void (*fun)(ffi_cif*,void*,void**,void*),
- void *user_data,
- void *codeloc)
-{
-#ifdef X86_WIN64
-#define ISFLOAT(IDX) (cif->arg_types[IDX]->type == FFI_TYPE_FLOAT || cif->arg_types[IDX]->type == FFI_TYPE_DOUBLE)
-#define FLAG(IDX) (cif->nargs>(IDX)&&ISFLOAT(IDX)?(1<<(IDX)):0)
- if (cif->abi == FFI_WIN64)
- {
- int mask = FLAG(0)|FLAG(1)|FLAG(2)|FLAG(3);
- FFI_INIT_TRAMPOLINE_WIN64 (&closure->tramp[0],
- &ffi_closure_win64,
- codeloc, mask);
- /* make sure we can execute here */
- }
-#else
- if (cif->abi == FFI_SYSV)
- {
- FFI_INIT_TRAMPOLINE (&closure->tramp[0],
- &ffi_closure_SYSV,
- (void*)codeloc);
- }
-#ifdef X86_WIN32
- else if (cif->abi == FFI_STDCALL)
- {
- FFI_INIT_TRAMPOLINE_STDCALL (&closure->tramp[0],
- &ffi_closure_STDCALL,
- (void*)codeloc, cif->bytes);
- }
-#endif /* X86_WIN32 */
-#endif /* !X86_WIN64 */
- else
- {
- return FFI_BAD_ABI;
- }
-
- closure->cif = cif;
- closure->user_data = user_data;
- closure->fun = fun;
-
- return FFI_OK;
-}
-
-/* ------- Native raw API support -------------------------------- */
-
-#if !FFI_NO_RAW_API
-
-ffi_status
-ffi_prep_raw_closure_loc (ffi_raw_closure* closure,
- ffi_cif* cif,
- void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
- void *user_data,
- void *codeloc)
-{
- int i;
-
- if (cif->abi != FFI_SYSV) {
- return FFI_BAD_ABI;
- }
-
- // 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,
- codeloc);
-
- 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.)
- */
-
-void
-ffi_raw_call(ffi_cif *cif, void (*fn)(void), void *rvalue, 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))
- {
- ecif.rvalue = alloca(cif->rtype->size);
- }
- else
- ecif.rvalue = rvalue;
-
-
- switch (cif->abi)
- {
-#ifdef X86_WIN32
- case FFI_SYSV:
- case FFI_STDCALL:
- ffi_call_win32(ffi_prep_args_raw, &ecif, cif->bytes, cif->flags,
- ecif.rvalue, fn);
- break;
-#else
- case FFI_SYSV:
- ffi_call_SYSV(ffi_prep_args_raw, &ecif, cif->bytes, cif->flags,
- ecif.rvalue, fn);
- break;
-#endif
- default:
- FFI_ASSERT(0);
- break;
- }
-}
-
-#endif
-
-#endif /* !__x86_64__ || X86_WIN64 */
-
projects / platform / upstream / libffi.git / commitdiff