1/* -----------------------------------------------------------------------
2   arcompact.S - Copyright (c) 2013 Synposys, Inc. (www.synopsys.com)
3
4   ARCompact 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#define CNAME(x) x
33#define ENTRY(x) .globl CNAME(x)` .type CNAME(x),%function` CNAME(x):
34#endif
35
36.text
37
38        /* R0:   ffi_prep_args */
39        /* R1:   &ecif */
40        /* R2:   cif->bytes */
41        /* R3:   fig->flags */
42        /* R4:   ecif.rvalue */
43        /* R5:   fn */
44ENTRY(ffi_call_ARCompact)
45        /* Save registers.  */
46        st.a       fp, [sp, -4]        /* fp + 20, fp */
47        push_s     blink               /* fp + 16, blink */
48        st.a       r4, [sp, -4]        /* fp + 12, ecif.rvalue */
49        push_s     r3                  /* fp +  8, fig->flags */
50        st.a       r5, [sp, -4]        /* fp +  4, fn */
51        push_s     r2                  /* fp +  0, cif->bytes */
52        mov        fp, sp
53
54        /* Make room for all of the new args.  */
55        sub        sp, sp, r2
56
57        /* Place all of the ffi_prep_args in position.  */
58        /* ffi_prep_args(char *stack, extended_cif *ecif) */
59        /* R1 already set.  */
60
61        /* And call.  */
62        jl_s.d     [r0]
63        mov_s      r0, sp
64
65        ld.ab      r12, [fp, 4]        /* cif->bytes */
66        ld.ab      r11, [fp, 4]        /* fn */
67
68        /* Move first 8 parameters in registers...  */
69        ld_s       r0, [sp]
70        ld_s       r1, [sp, 4]
71        ld_s       r2, [sp, 8]
72        ld_s       r3, [sp, 12]
73        ld         r4, [sp, 16]
74        ld         r5, [sp, 20]
75        ld         r6, [sp, 24]
76        ld         r7, [sp, 28]
77
78        /* ...and adjust the stack.  */
79        min        r12, r12, 32
80
81        /* Call the function.  */
82        jl.d       [r11]
83        add        sp, sp, r12
84
85        mov        sp, fp
86        pop_s      r3        /* fig->flags, return type */
87        pop_s      r2        /* ecif.rvalue, pointer for return value */
88
89        /* If the return value pointer is NULL, assume no return value.  */
90        breq.d     r2, 0, epilogue
91        pop_s      blink
92
93        /* Return INT.  */
94        brne       r3, FFI_TYPE_INT, return_double
95        b.d        epilogue
96        st_s       r0, [r2]
97
98return_double:
99        brne       r3, FFI_TYPE_DOUBLE, epilogue
100        st_s       r0, [r2]
101        st_s       r1, [r2,4]
102
103epilogue:
104        j_s.d      [blink]
105        ld.ab      fp, [sp, 4]
106
107ENTRY(ffi_closure_ARCompact)
108        st.a       r0, [sp, -32]
109        st_s       r1, [sp, 4]
110        st_s       r2, [sp, 8]
111        st_s       r3, [sp, 12]
112        st         r4, [sp, 16]
113        st         r5, [sp, 20]
114        st         r6, [sp, 24]
115        st         r7, [sp, 28]
116
117        /* pointer to arguments */
118        mov_s      r2, sp
119
120        /* return value goes here */
121        sub        sp, sp, 8
122        mov_s      r1, sp
123
124        push_s     blink
125
126        bl.d       ffi_closure_inner_ARCompact
127        mov_s      r0, r8                /* codeloc, set by trampoline */
128
129        pop_s      blink
130
131        /* set return value to r1:r0 */
132        pop_s      r0
133        pop_s      r1
134        j_s.d      [blink]
135        add_s      sp, sp, 32
136