rubinius/rubinius

/* -----------------------------------------------------------------------
   sysv.S - Copyright (c) 2004 Renesas Technology
   
   M32R 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 RENESAS TECHNOLOGY 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.
   ----------------------------------------------------------------------- */

#define LIBFFI_ASM
#include <fficonfig.h>
#include <ffi.h>
#ifdef HAVE_MACHINE_ASM_H
#include <machine/asm.h>
#else
/* XXX these lose for some platforms, I'm sure.  */
#define CNAME(x) x
#define ENTRY(x) .globl CNAME(x)! .type CNAME(x),%function! CNAME(x):
#endif

.text

    /* R0:   ffi_prep_args */
    /* R1:   &ecif */
    /* R2:   cif->bytes */
    /* R3:   fig->flags */
    /* sp+0: ecif.rvalue */
    /* sp+4: fn */

    /* This assumes we are using gas.  */
ENTRY(ffi_call_SYSV)
    /* Save registers.  */
    push    fp
    push    lr
    push    r3
    push    r2
    push    r1
    push    r0
    mv    fp, sp

    /* Make room for all of the new args.  */
    sub    sp, r2

    /* Place all of the ffi_prep_args in position.  */
    mv    lr, r0    
    mv    r0, sp
    /* R1 already set.  */

    /* And call.  */
    jl    lr

    /* Move first 4 parameters in registers...  */
    ld    r0, @(0,sp)
    ld    r1, @(4,sp)
    ld    r2, @(8,sp)
        ld    r3, @(12,sp)

    /* ...and adjust the stack.  */
    ld    lr, @(8,fp)
        cmpi    lr, #16
    bc    adjust_stack
    ldi    lr, #16
adjust_stack:
        add    sp, lr

    /* Call the function.  */
    ld    lr, @(28,fp)
    jl    lr    

    /* Remove the space we pushed for the args.  */
    mv    sp, fp    

    /* Load R2 with the pointer to storage for the return value.  */
    ld    r2, @(24,sp)

    /* Load R3 with the return type code.  */
    ld    r3, @(12,sp)

    /* If the return value pointer is NULL, assume no return value.  */
    beqz    r2, epilogue

    /* Return INT.  */
    ldi    r4, #FFI_TYPE_INT
    bne    r3, r4, return_double
    st    r0, @r2    
    bra    epilogue

return_double:
    /* Return DOUBLE or LONGDOUBLE.  */
    ldi    r4, #FFI_TYPE_DOUBLE
    bne    r3, r4, epilogue
    st    r0, @r2    
    st    r1, @(4,r2)

epilogue:
    pop    r0
    pop    r1
    pop    r2
    pop    r3
    pop    lr
    pop    fp
        jmp lr

.ffi_call_SYSV_end:
        .size    CNAME(ffi_call_SYSV),.ffi_call_SYSV_end-CNAME(ffi_call_SYSV)