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/Modules/_ctypes/libffi/src/m32r/sysv.S

http://unladen-swallow.googlecode.com/
Assembly | 121 lines | 116 code | 5 blank | 0 comment | 1 complexity | fde1f5cb81ab7ce114af861c94c368c0 MD5 | raw file
  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.  */
 47ENTRY(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
 79adjust_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
104return_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
111epilogue:
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)