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/* -----------------------------------------------------------------------
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ffi.c - Copyright (c) 2004 Anthony Green
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FR-V Foreign Function Interface
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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``Software''), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL CYGNUS SOLUTIONS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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----------------------------------------------------------------------- */
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#include <ffi_common.h>
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/* ffi_prep_args is called by the assembly routine once stack space
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has been allocated for the function's arguments */
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void *ffi_prep_args(char *stack, extended_cif *ecif)
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register unsigned int i;
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register void **p_argv;
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register ffi_type **p_arg;
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register int count = 0;
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p_argv = ecif->avalue;
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for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types;
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if ((*p_arg)->type == FFI_TYPE_STRUCT)
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*(void **) argp = *p_argv;
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/* if ((*p_arg)->type == FFI_TYPE_FLOAT)
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// This is going on the stack. Turn it into a double.
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*(double *) argp = (double) *(float*)(* p_argv);
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*(void **) argp = *(void **)(* p_argv);
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else if (z < sizeof(int))
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switch ((*p_arg)->type)
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*(signed int *) argp = (signed int)*(SINT8 *)(* p_argv);
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*(unsigned int *) argp = (unsigned int)*(UINT8 *)(* p_argv);
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*(signed int *) argp = (signed int)*(SINT16 *)(* p_argv);
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*(unsigned int *) argp = (unsigned int)*(UINT16 *)(* p_argv);
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else if (z == sizeof(int))
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*(unsigned int *) argp = (unsigned int)*(UINT32 *)(* p_argv);
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memcpy(argp, *p_argv, z);
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return (stack + ((count > 24) ? 24 : ALIGN_DOWN(count, 8)));
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/* Perform machine dependent cif processing */
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ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
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if (cif->rtype->type == FFI_TYPE_STRUCT)
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cif->flags = cif->rtype->size;
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cif->bytes = ALIGN (cif->bytes, 8);
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extern void ffi_call_EABI(void *(*)(char *, extended_cif *),
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void ffi_call(ffi_cif *cif,
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ecif.avalue = avalue;
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/* If the return value is a struct and we don't have a return */
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/* value address then we need to make one */
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if ((rvalue == NULL) &&
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(cif->rtype->type == FFI_TYPE_STRUCT))
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ecif.rvalue = alloca(cif->rtype->size);
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ecif.rvalue = rvalue;
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ffi_call_EABI(ffi_prep_args, &ecif, cif->bytes,
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cif->flags, ecif.rvalue, fn);
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void ffi_closure_eabi (unsigned arg1, unsigned arg2, unsigned arg3,
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unsigned arg4, unsigned arg5, unsigned arg6)
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/* This function is called by a trampoline. The trampoline stows a
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pointer to the ffi_closure object in gr7. We must save this
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pointer in a place that will persist while we do our work. */
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register ffi_closure *creg __asm__ ("gr7");
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ffi_closure *closure = creg;
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/* Arguments that don't fit in registers are found on the stack
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at a fixed offset above the current frame pointer. */
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register char *frame_pointer __asm__ ("fp");
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char *stack_args = frame_pointer + 16;
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/* Lay the register arguments down in a continuous chunk of memory. */
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unsigned register_args[6] =
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{ arg1, arg2, arg3, arg4, arg5, arg6 };
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ffi_cif *cif = closure->cif;
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ffi_type **arg_types = cif->arg_types;
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void **avalue = alloca (cif->nargs * sizeof(void *));
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char *ptr = (char *) register_args;
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/* Find the address of each argument. */
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for (i = 0; i < cif->nargs; i++)
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switch (arg_types[i]->type)
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case FFI_TYPE_SINT16:
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case FFI_TYPE_UINT16:
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case FFI_TYPE_SINT32:
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case FFI_TYPE_UINT32:
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case FFI_TYPE_STRUCT:
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avalue[i] = *(void**)ptr;
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/* This is an 8-byte value. */
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/* If we've handled more arguments than fit in registers,
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start looking at the those passed on the stack. */
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if (ptr == ((char *)register_args + (6*4)))
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/* Invoke the closure. */
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if (cif->rtype->type == FFI_TYPE_STRUCT)
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/* The caller allocates space for the return structure, and
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passes a pointer to this space in gr3. Use this value directly
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as the return value. */
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register void *return_struct_ptr __asm__("gr3");
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(closure->fun) (cif, return_struct_ptr, avalue, closure->user_data);
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/* Allocate space for the return value and call the function. */
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(closure->fun) (cif, &rvalue, avalue, closure->user_data);
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/* Functions return 4-byte or smaller results in gr8. 8-byte
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values also use gr9. We fill the both, even for small return
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values, just to avoid a branch. */
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asm ("ldi @(%0, #0), gr8" : : "r" (&rvalue));
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asm ("ldi @(%0, #0), gr9" : : "r" (&((int *) &rvalue)[1]));
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ffi_prep_closure (ffi_closure* closure,
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void (*fun)(ffi_cif*, void*, void**, void*),
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unsigned int *tramp = (unsigned int *) &closure->tramp[0];
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unsigned long fn = (long) ffi_closure_eabi;
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unsigned long cls = (long) closure;
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register void *got __asm__("gr15");
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fn = (unsigned long) ffi_closure_eabi;
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tramp[0] = &tramp[2];
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tramp[2] = 0x8cfc0000 + (fn & 0xffff); /* setlos lo(fn), gr6 */
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tramp[3] = 0x8efc0000 + (cls & 0xffff); /* setlos lo(cls), gr7 */
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tramp[4] = 0x8cf80000 + (fn >> 16); /* sethi hi(fn), gr6 */
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tramp[5] = 0x8ef80000 + (cls >> 16); /* sethi hi(cls), gr7 */
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tramp[6] = 0x9cc86000; /* ldi @(gr6, #0), gr14 */
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tramp[7] = 0x8030e000; /* jmpl @(gr14, gr0) */
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tramp[0] = 0x8cfc0000 + (fn & 0xffff); /* setlos lo(fn), gr6 */
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tramp[1] = 0x8efc0000 + (cls & 0xffff); /* setlos lo(cls), gr7 */
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tramp[2] = 0x8cf80000 + (fn >> 16); /* sethi hi(fn), gr6 */
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tramp[3] = 0x8ef80000 + (cls >> 16); /* sethi hi(cls), gr7 */
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tramp[4] = 0x80300006; /* jmpl @(gr0, gr6) */
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closure->user_data = user_data;
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/* Cache flushing. */
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for (i = 0; i < FFI_TRAMPOLINE_SIZE; i++)
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__asm__ volatile ("dcf @(%0,%1)\n\tici @(%0,%1)" :: "r" (tramp), "r" (i));