1 /* -----------------------------------------------------------------------
2 ffi.c - Copyright (C) 2009 Anthony Green
4 Moxie Foreign Function Interface
6 Permission is hereby granted, free of charge, to any person obtaining
7 a copy of this software and associated documentation files (the
8 ``Software''), to deal in the Software without restriction, including
9 without limitation the rights to use, copy, modify, merge, publish,
10 distribute, sublicense, and/or sell copies of the Software, and to
11 permit persons to whom the Software is furnished to do so, subject to
12 the following conditions:
14 The above copyright notice and this permission notice shall be included
15 in all copies or substantial portions of the Software.
17 THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
18 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
21 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
22 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
24 DEALINGS IN THE SOFTWARE.
25 ----------------------------------------------------------------------- */
28 #include <ffi_common.h>
32 /* ffi_prep_args is called by the assembly routine once stack space
33 has been allocated for the function's arguments */
35 void *ffi_prep_args(char *stack, extended_cif *ecif)
37 register unsigned int i;
38 register void **p_argv;
40 register ffi_type **p_arg;
41 register int count = 0;
43 p_argv = ecif->avalue;
46 for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types;
54 if ((*p_arg)->type == FFI_TYPE_STRUCT)
57 *(void **) argp = *p_argv;
59 /* if ((*p_arg)->type == FFI_TYPE_FLOAT)
63 // This is going on the stack. Turn it into a double.
64 *(double *) argp = (double) *(float*)(* p_argv);
68 *(void **) argp = *(void **)(* p_argv);
70 else if (z < sizeof(int))
73 switch ((*p_arg)->type)
76 *(signed int *) argp = (signed int)*(SINT8 *)(* p_argv);
80 *(unsigned int *) argp = (unsigned int)*(UINT8 *)(* p_argv);
84 *(signed int *) argp = (signed int)*(SINT16 *)(* p_argv);
88 *(unsigned int *) argp = (unsigned int)*(UINT16 *)(* p_argv);
95 else if (z == sizeof(int))
97 *(unsigned int *) argp = (unsigned int)*(UINT32 *)(* p_argv);
101 memcpy(argp, *p_argv, z);
108 return (stack + ((count > 24) ? 24 : ALIGN_DOWN(count, 8)));
111 /* Perform machine dependent cif processing */
112 ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
114 if (cif->rtype->type == FFI_TYPE_STRUCT)
117 cif->flags = cif->rtype->size;
119 cif->bytes = ALIGN (cif->bytes, 8);
124 extern void ffi_call_EABI(void *(*)(char *, extended_cif *),
130 void ffi_call(ffi_cif *cif,
138 ecif.avalue = avalue;
140 /* If the return value is a struct and we don't have a return */
141 /* value address then we need to make one */
143 if ((rvalue == NULL) &&
144 (cif->rtype->type == FFI_TYPE_STRUCT))
146 ecif.rvalue = alloca(cif->rtype->size);
149 ecif.rvalue = rvalue;
155 ffi_call_EABI(ffi_prep_args, &ecif, cif->bytes,
156 cif->flags, ecif.rvalue, fn);
164 void ffi_closure_eabi (unsigned arg1, unsigned arg2, unsigned arg3,
165 unsigned arg4, unsigned arg5, unsigned arg6)
167 /* This function is called by a trampoline. The trampoline stows a
168 pointer to the ffi_closure object in gr7. We must save this
169 pointer in a place that will persist while we do our work. */
170 register ffi_closure *creg __asm__ ("gr7");
171 ffi_closure *closure = creg;
173 /* Arguments that don't fit in registers are found on the stack
174 at a fixed offset above the current frame pointer. */
175 register char *frame_pointer __asm__ ("fp");
176 char *stack_args = frame_pointer + 16;
178 /* Lay the register arguments down in a continuous chunk of memory. */
179 unsigned register_args[6] =
180 { arg1, arg2, arg3, arg4, arg5, arg6 };
182 ffi_cif *cif = closure->cif;
183 ffi_type **arg_types = cif->arg_types;
184 void **avalue = alloca (cif->nargs * sizeof(void *));
185 char *ptr = (char *) register_args;
188 /* Find the address of each argument. */
189 for (i = 0; i < cif->nargs; i++)
191 switch (arg_types[i]->type)
197 case FFI_TYPE_SINT16:
198 case FFI_TYPE_UINT16:
201 case FFI_TYPE_SINT32:
202 case FFI_TYPE_UINT32:
206 case FFI_TYPE_STRUCT:
207 avalue[i] = *(void**)ptr;
210 /* This is an 8-byte value. */
217 /* If we've handled more arguments than fit in registers,
218 start looking at the those passed on the stack. */
219 if (ptr == ((char *)register_args + (6*4)))
223 /* Invoke the closure. */
224 if (cif->rtype->type == FFI_TYPE_STRUCT)
226 /* The caller allocates space for the return structure, and
227 passes a pointer to this space in gr3. Use this value directly
228 as the return value. */
229 register void *return_struct_ptr __asm__("gr3");
230 (closure->fun) (cif, return_struct_ptr, avalue, closure->user_data);
234 /* Allocate space for the return value and call the function. */
236 (closure->fun) (cif, &rvalue, avalue, closure->user_data);
238 /* Functions return 4-byte or smaller results in gr8. 8-byte
239 values also use gr9. We fill the both, even for small return
240 values, just to avoid a branch. */
241 asm ("ldi @(%0, #0), gr8" : : "r" (&rvalue));
242 asm ("ldi @(%0, #0), gr9" : : "r" (&((int *) &rvalue)[1]));
247 ffi_prep_closure_loc (ffi_closure* closure,
249 void (*fun)(ffi_cif*, void*, void**, void*),
253 unsigned int *tramp = (unsigned int *) &closure->tramp[0];
254 unsigned long fn = (long) ffi_closure_eabi;
255 unsigned long cls = (long) codeloc;
258 fn = (unsigned long) ffi_closure_eabi;
260 tramp[0] = 0x8cfc0000 + (fn & 0xffff); /* setlos lo(fn), gr6 */
261 tramp[1] = 0x8efc0000 + (cls & 0xffff); /* setlos lo(cls), gr7 */
262 tramp[2] = 0x8cf80000 + (fn >> 16); /* sethi hi(fn), gr6 */
263 tramp[3] = 0x8ef80000 + (cls >> 16); /* sethi hi(cls), gr7 */
264 tramp[4] = 0x80300006; /* jmpl @(gr0, gr6) */
268 closure->user_data = user_data;
270 /* Cache flushing. */
271 for (i = 0; i < FFI_TRAMPOLINE_SIZE; i++)
272 __asm__ volatile ("dcf @(%0,%1)\n\tici @(%2,%1)" :: "r" (tramp), "r" (i),