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-rw-r--r--gcc-4.4.3/libffi/src/arm/ffi.c308
1 files changed, 308 insertions, 0 deletions
diff --git a/gcc-4.4.3/libffi/src/arm/ffi.c b/gcc-4.4.3/libffi/src/arm/ffi.c
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index 000000000..35b2c3477
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+++ b/gcc-4.4.3/libffi/src/arm/ffi.c
@@ -0,0 +1,308 @@
+/* -----------------------------------------------------------------------
+ ffi.c - Copyright (c) 1998 Red Hat, Inc.
+
+ ARM 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 */
+
+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 ) {
+ *(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);
+ }
+
+ if ((*p_arg)->type == FFI_TYPE_STRUCT)
+ argp = (char *) ALIGN(argp, 4);
+
+ 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_STRUCT:
+ memcpy(argp, *p_argv, (*p_arg)->size);
+ break;
+
+ default:
+ FFI_ASSERT(0);
+ }
+ }
+ else if (z == sizeof(int))
+ {
+ *(unsigned int *) argp = (unsigned int)*(UINT32 *)(* p_argv);
+ }
+ 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)
+{
+ /* Round the stack up to a multiple of 8 bytes. This isn't needed
+ everywhere, but it is on some platforms, and it doesn't harm anything
+ when it isn't needed. */
+ cif->bytes = (cif->bytes + 7) & ~7;
+
+ /* Set the return type flag */
+ switch (cif->rtype->type)
+ {
+ case FFI_TYPE_VOID:
+ case FFI_TYPE_FLOAT:
+ case FFI_TYPE_DOUBLE:
+ cif->flags = (unsigned) cif->rtype->type;
+ break;
+
+ case FFI_TYPE_SINT64:
+ case FFI_TYPE_UINT64:
+ cif->flags = (unsigned) FFI_TYPE_SINT64;
+ break;
+
+ case FFI_TYPE_STRUCT:
+ if (cif->rtype->size <= 4)
+ /* A Composite Type not larger than 4 bytes is returned in r0. */
+ cif->flags = (unsigned)FFI_TYPE_INT;
+ else
+ /* A Composite Type larger than 4 bytes, or whose size cannot
+ be determined statically ... is stored in memory at an
+ address passed [in r0]. */
+ cif->flags = (unsigned)FFI_TYPE_STRUCT;
+ break;
+
+ default:
+ cif->flags = FFI_TYPE_INT;
+ break;
+ }
+
+ return FFI_OK;
+}
+
+extern void ffi_call_SYSV(void (*)(char *, extended_cif *), extended_cif *,
+ unsigned, unsigned, unsigned *, void (*fn)());
+
+void ffi_call(ffi_cif *cif, void (*fn)(), void *rvalue, void **avalue)
+{
+ extended_cif ecif;
+
+ int small_struct = (cif->flags == FFI_TYPE_INT
+ && cif->rtype->type == FFI_TYPE_STRUCT);
+
+ ecif.cif = cif;
+ ecif.avalue = avalue;
+
+ unsigned int temp;
+
+ /* 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->flags == FFI_TYPE_STRUCT))
+ {
+ ecif.rvalue = alloca(cif->rtype->size);
+ }
+ else if (small_struct)
+ ecif.rvalue = &temp;
+ else
+ ecif.rvalue = rvalue;
+
+ switch (cif->abi)
+ {
+ case FFI_SYSV:
+ ffi_call_SYSV(ffi_prep_args, &ecif, cif->bytes, cif->flags, ecif.rvalue,
+ fn);
+
+ break;
+ default:
+ FFI_ASSERT(0);
+ break;
+ }
+ if (small_struct)
+ memcpy (rvalue, &temp, cif->rtype->size);
+}
+
+/** private members **/
+
+static void ffi_prep_incoming_args_SYSV (char *stack, void **ret,
+ void** args, ffi_cif* cif);
+
+void ffi_closure_SYSV (ffi_closure *);
+
+/* This function is jumped to by the trampoline */
+
+unsigned int
+ffi_closure_SYSV_inner (closure, respp, args)
+ 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 re-set 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;
+}
+
+/*@-exportheader@*/
+static void
+ffi_prep_incoming_args_SYSV(char *stack, void **rvalue,
+ void **avalue, ffi_cif *cif)
+/*@=exportheader@*/
+{
+ register unsigned int i;
+ register void **p_argv;
+ register char *argp;
+ register ffi_type **p_arg;
+
+ argp = stack;
+
+ if ( cif->flags == 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;
+
+ size_t alignment = (*p_arg)->alignment;
+ if (alignment < 4)
+ alignment = 4;
+ /* Align if necessary */
+ if ((alignment - 1) & (unsigned) argp) {
+ argp = (char *) ALIGN(argp, 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. */
+
+#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*) &__tramp[0] = 0xe92d000f; /* stmfd sp!, {r0-r3} */ \
+ *(unsigned int*) &__tramp[4] = 0xe59f0000; /* ldr r0, [pc] */ \
+ *(unsigned int*) &__tramp[8] = 0xe59ff000; /* ldr pc, [pc] */ \
+ *(unsigned int*) &__tramp[12] = __ctx; \
+ *(unsigned int*) &__tramp[16] = __fun; \
+ __clear_cache((&__tramp[0]), (&__tramp[19])); \
+ })
+
+
+/* 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)
+{
+ FFI_ASSERT (cif->abi == FFI_SYSV);
+
+ FFI_INIT_TRAMPOLINE (&closure->tramp[0], \
+ &ffi_closure_SYSV, \
+ codeloc);
+
+ closure->cif = cif;
+ closure->user_data = user_data;
+ closure->fun = fun;
+
+ return FFI_OK;
+}
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