github.com/prattmic/llgo-embedded@v0.0.0-20150820070356-41cfecea0e1e/third_party/gofrontend/libffi/src/m32r/sysv.S (about)

     1  /* -----------------------------------------------------------------------
     2     sysv.S - Copyright (c) 2004 Renesas Technology
     3     
     4     M32R Foreign Function Interface 
     5  
     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:
    13  
    14     The above copyright notice and this permission notice shall be included
    15     in all copies or substantial portions of the Software.
    16  
    17     THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
    18     OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    19     MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
    20     IN NO EVENT SHALL RENESAS TECHNOLOGY BE LIABLE FOR ANY CLAIM, DAMAGES OR
    21     OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
    22     ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
    23     OTHER DEALINGS IN THE SOFTWARE.
    24     ----------------------------------------------------------------------- */
    25  
    26  #define LIBFFI_ASM
    27  #include <fficonfig.h>
    28  #include <ffi.h>
    29  #ifdef HAVE_MACHINE_ASM_H
    30  #include <machine/asm.h>
    31  #else
    32  /* XXX these lose for some platforms, I'm sure.  */
    33  #define CNAME(x) x
    34  #define ENTRY(x) .globl CNAME(x)! .type CNAME(x),%function! CNAME(x):
    35  #endif
    36  
    37  .text
    38  
    39  	/* R0:   ffi_prep_args */
    40  	/* R1:   &ecif */
    41  	/* R2:   cif->bytes */
    42  	/* R3:   fig->flags */
    43  	/* sp+0: ecif.rvalue */
    44  	/* sp+4: fn */
    45  
    46  	/* This assumes we are using gas.  */
    47  ENTRY(ffi_call_SYSV)
    48  	/* Save registers.  */
    49  	push	fp
    50  	push	lr
    51  	push	r3
    52  	push	r2
    53  	push	r1
    54  	push	r0
    55  	mv	fp, sp
    56  
    57  	/* Make room for all of the new args.  */
    58  	sub	sp, r2
    59  
    60  	/* Place all of the ffi_prep_args in position.  */
    61  	mv	lr, r0	
    62  	mv	r0, sp
    63  	/* R1 already set.  */
    64  
    65  	/* And call.  */
    66  	jl	lr
    67  
    68  	/* Move first 4 parameters in registers...  */
    69  	ld	r0, @(0,sp)
    70  	ld	r1, @(4,sp)
    71  	ld	r2, @(8,sp)
    72          ld	r3, @(12,sp)
    73  
    74  	/* ...and adjust the stack.  */
    75  	ld	lr, @(8,fp)
    76          cmpi	lr, #16
    77  	bc	adjust_stack
    78  	ldi	lr, #16
    79  adjust_stack:
    80          add	sp, lr
    81  
    82  	/* Call the function.  */
    83  	ld	lr, @(28,fp)
    84  	jl	lr	
    85  
    86  	/* Remove the space we pushed for the args.  */
    87  	mv	sp, fp	
    88  
    89  	/* Load R2 with the pointer to storage for the return value.  */
    90  	ld	r2, @(24,sp)
    91  
    92  	/* Load R3 with the return type code.  */
    93  	ld	r3, @(12,sp)
    94  
    95  	/* If the return value pointer is NULL, assume no return value.  */
    96  	beqz	r2, epilogue
    97  
    98  	/* Return INT.  */
    99  	ldi	r4, #FFI_TYPE_INT
   100  	bne	r3, r4, return_double
   101  	st	r0, @r2	
   102  	bra	epilogue
   103  
   104  return_double:
   105  	/* Return DOUBLE or LONGDOUBLE.  */
   106  	ldi	r4, #FFI_TYPE_DOUBLE
   107  	bne	r3, r4, epilogue
   108  	st	r0, @r2	
   109  	st	r1, @(4,r2)
   110  
   111  epilogue:
   112  	pop	r0
   113  	pop	r1
   114  	pop	r2
   115  	pop	r3
   116  	pop	lr
   117  	pop	fp
   118          jmp lr
   119  
   120  .ffi_call_SYSV_end:
   121          .size    CNAME(ffi_call_SYSV),.ffi_call_SYSV_end-CNAME(ffi_call_SYSV)