Ruby
2.7.1p83(2020-03-31revisiona0c7c23c9cec0d0ffcba012279cd652d28ad5bf3)
ext
fiddle
libffi-3.2.1
src
bfin
ffi.c
Go to the documentation of this file.
1
/* -----------------------------------------------------------------------
2
ffi.c - Copyright (c) 2012 Alexandre K. I. de Mendonca <alexandre.keunecke@gmail.com>,
3
Paulo Pizarro <paulo.pizarro@gmail.com>
4
5
Blackfin Foreign Function Interface
6
7
Permission is hereby granted, free of charge, to any person obtaining
8
a copy of this software and associated documentation files (the
9
``Software''), to deal in the Software without restriction, including
10
without limitation the rights to use, copy, modify, merge, publish,
11
distribute, sublicense, and/or sell copies of the Software, and to
12
permit persons to whom the Software is furnished to do so, subject to
13
the following conditions:
14
15
The above copyright notice and this permission notice shall be included
16
in all copies or substantial portions of the Software.
17
18
THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
19
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
22
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
23
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25
DEALINGS IN THE SOFTWARE.
26
----------------------------------------------------------------------- */
27
#include <ffi.h>
28
#include <
ffi_common.h
>
29
30
#include <stdlib.h>
31
#include <stdio.h>
32
33
/* Maximum number of GPRs available for argument passing. */
34
#define MAX_GPRARGS 3
35
36
/*
37
* Return types
38
*/
39
#define FFIBFIN_RET_VOID 0
40
#define FFIBFIN_RET_BYTE 1
41
#define FFIBFIN_RET_HALFWORD 2
42
#define FFIBFIN_RET_INT64 3
43
#define FFIBFIN_RET_INT32 4
44
45
/*====================================================================*/
46
/* PROTOTYPE *
47
/*====================================================================*/
48
void
ffi_prep_args
(
unsigned
char
*,
extended_cif
*);
49
50
/*====================================================================*/
51
/* Externals */
52
/* (Assembly) */
53
/*====================================================================*/
54
55
extern
void
ffi_call_SYSV
(
unsigned
,
extended_cif
*,
void
(*)(
unsigned
char
*,
extended_cif
*),
unsigned
,
void
*,
void
(*fn)(
void
));
56
57
/*====================================================================*/
58
/* Implementation */
59
/* */
60
/*====================================================================*/
61
62
63
/*
64
* This function calculates the return type (size) based on type.
65
*/
66
67
ffi_status
ffi_prep_cif_machdep
(ffi_cif *cif)
68
{
69
/* --------------------------------------*
70
* Return handling *
71
* --------------------------------------*/
72
switch
(cif->rtype->type) {
73
case
FFI_TYPE_VOID:
74
cif->flags =
FFIBFIN_RET_VOID
;
75
break
;
76
case
FFI_TYPE_UINT16:
77
case
FFI_TYPE_SINT16:
78
cif->flags =
FFIBFIN_RET_HALFWORD
;
79
break
;
80
case
FFI_TYPE_UINT8:
81
cif->flags =
FFIBFIN_RET_BYTE
;
82
break
;
83
case
FFI_TYPE_INT:
84
case
FFI_TYPE_UINT32:
85
case
FFI_TYPE_SINT32:
86
case
FFI_TYPE_FLOAT:
87
case
FFI_TYPE_POINTER:
88
case
FFI_TYPE_SINT8:
89
cif->flags =
FFIBFIN_RET_INT32
;
90
break
;
91
case
FFI_TYPE_SINT64:
92
case
FFI_TYPE_UINT64:
93
case
FFI_TYPE_DOUBLE:
94
cif->flags =
FFIBFIN_RET_INT64
;
95
break
;
96
case
FFI_TYPE_STRUCT:
97
if
(cif->rtype->size <= 4){
98
cif->flags =
FFIBFIN_RET_INT32
;
99
}
else
if
(cif->rtype->size == 8){
100
cif->flags =
FFIBFIN_RET_INT64
;
101
}
else
{
102
//it will return via a hidden pointer in P0
103
cif->flags =
FFIBFIN_RET_VOID
;
104
}
105
break
;
106
default
:
107
FFI_ASSERT
(0);
108
break
;
109
}
110
return
FFI_OK;
111
}
112
113
/*
114
* This will prepare the arguments and will call the assembly routine
115
* cif = the call interface
116
* fn = the function to be called
117
* rvalue = the return value
118
* avalue = the arguments
119
*/
120
void
ffi_call
(ffi_cif *cif,
void
(*fn)(
void
),
void
*rvalue,
void
**avalue)
121
{
122
int
ret_type = cif->flags;
123
extended_cif
ecif;
124
ecif.
cif
= cif;
125
ecif.
avalue
= avalue;
126
ecif.
rvalue
= rvalue;
127
128
switch
(cif->abi) {
129
case
FFI_SYSV
:
130
ffi_call_SYSV
(cif->bytes, &ecif,
ffi_prep_args
, ret_type, ecif.
rvalue
, fn);
131
break
;
132
default
:
133
FFI_ASSERT
(0);
134
break
;
135
}
136
}
137
138
139
/*
140
* This function prepares the parameters (copies them from the ecif to the stack)
141
* to call the function (ffi_prep_args is called by the assembly routine in file
142
* sysv.S, which also calls the actual function)
143
*/
144
void
ffi_prep_args
(
unsigned
char
*stack,
extended_cif
*ecif)
145
{
146
register
unsigned
int
i
= 0;
147
void
**p_argv;
148
unsigned
char
*argp;
149
ffi_type **p_arg;
150
argp = stack;
151
p_argv = ecif->
avalue
;
152
for
(
i
= ecif->
cif
->nargs, p_arg = ecif->
cif
->arg_types;
153
(
i
!= 0);
154
i
--, p_arg++) {
155
size_t
z;
156
z = (*p_arg)->size;
157
if
(z <
sizeof
(
int
)) {
158
z =
sizeof
(
int
);
159
switch
((*p_arg)->type) {
160
case
FFI_TYPE_SINT8: {
161
signed
char
v
= *(SINT8 *)(* p_argv);
162
signed
int
t =
v
;
163
*(
signed
int
*) argp = t;
164
}
165
break
;
166
case
FFI_TYPE_UINT8: {
167
unsigned
char
v
= *(UINT8 *)(* p_argv);
168
unsigned
int
t =
v
;
169
*(
unsigned
int
*) argp = t;
170
}
171
break
;
172
case
FFI_TYPE_SINT16:
173
*(
signed
int
*) argp = (
signed
int
) * (SINT16 *)(* p_argv);
174
break
;
175
case
FFI_TYPE_UINT16:
176
*(
unsigned
int
*) argp = (
unsigned
int
) * (UINT16 *)(* p_argv);
177
break
;
178
case
FFI_TYPE_STRUCT:
179
memcpy
(argp, *p_argv, (*p_arg)->size);
180
break
;
181
default
:
182
FFI_ASSERT
(0);
183
break
;
184
}
185
}
else
if
(z ==
sizeof
(
int
)) {
186
*(
unsigned
int
*) argp = (
unsigned
int
) * (UINT32 *)(* p_argv);
187
}
else
{
188
memcpy
(argp, *p_argv, z);
189
}
190
p_argv++;
191
argp += z;
192
}
193
}
194
195
196
FFI_ASSERT
#define FFI_ASSERT(x)
Definition:
ffi_common.h:72
i
uint32_t i
Definition:
rb_mjit_min_header-2.7.1.h:5464
ffi_call_SYSV
void ffi_call_SYSV(unsigned(*)(struct call_context *context, unsigned char *, extended_cif *), struct call_context *context, extended_cif *, size_t, void(*fn)(void))
extended_cif::rvalue
void * rvalue
Definition:
ffi_common.h:89
ffi_common.h
FFIBFIN_RET_VOID
#define FFIBFIN_RET_VOID
Definition:
ffi.c:39
FFIBFIN_RET_INT64
#define FFIBFIN_RET_INT64
Definition:
ffi.c:42
FFI_SYSV
@ FFI_SYSV
Definition:
ffitarget.h:36
ffi_prep_args
void ffi_prep_args(char *stack, extended_cif *ecif)
Definition:
ffi.c:46
FFIBFIN_RET_BYTE
#define FFIBFIN_RET_BYTE
Definition:
ffi.c:40
FFIBFIN_RET_INT32
#define FFIBFIN_RET_INT32
Definition:
ffi.c:43
ffi_prep_cif_machdep
ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
Definition:
ffi.c:758
extended_cif
Definition:
ffi_common.h:86
extended_cif::avalue
void ** avalue
Definition:
ffi_common.h:90
int
__inline__ int
Definition:
rb_mjit_min_header-2.7.1.h:2839
memcpy
void * memcpy(void *__restrict, const void *__restrict, size_t)
v
int VALUE v
Definition:
rb_mjit_min_header-2.7.1.h:12337
FFIBFIN_RET_HALFWORD
#define FFIBFIN_RET_HALFWORD
Definition:
ffi.c:41
ffi_call
void ffi_call(ffi_cif *cif, void(*fn)(void), void *rvalue, void **avalue)
Definition:
ffi.c:813
extended_cif::cif
ffi_cif * cif
Definition:
ffi_common.h:88
Generated by
1.8.17