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mbed_semihost_api.h
1 
2 /* mbed Microcontroller Library
3  * Copyright (c) 2006-2019 ARM Limited
4  * SPDX-License-Identifier: Apache-2.0
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18 #ifndef MBED_SEMIHOST_H
19 #define MBED_SEMIHOST_H
20 
21 #include "device.h"
22 
23 #ifdef __cplusplus
24 extern "C" {
25 #endif
26 
27 #if DEVICE_SEMIHOST
28 
29 #if !defined(__ARMCC_VERSION)
30 
31 #if defined(__ICCARM__)
32 static inline int __semihost(int reason, const void *arg)
33 {
34  return __semihosting(reason, (void *)arg);
35 }
36 #else
37 
38 #ifdef __thumb__
39 # define AngelSWI 0xAB
40 # define AngelSWIInsn "bkpt"
41 # define AngelSWIAsm bkpt
42 #else
43 # define AngelSWI 0x123456
44 # define AngelSWIInsn "swi"
45 # define AngelSWIAsm swi
46 #endif
47 
48 static inline int __semihost(int reason, const void *arg)
49 {
50  int value;
51 
52  asm volatile(
53  "mov r0, %1" "\n\t"
54  "mov r1, %2" "\n\t"
55  AngelSWIInsn " %a3" "\n\t"
56  "mov %0, r0"
57  : "=r"(value) /* output operands */
58  : "r"(reason), "r"(arg), "i"(AngelSWI) /* input operands */
59  : "r0", "r1", "r2", "r3", "ip", "lr", "memory", "cc" /* list of clobbered registers */
60  );
61 
62  return value;
63 }
64 #endif
65 #endif
66 
67 #if DEVICE_LOCALFILESYSTEM
68 FILEHANDLE semihost_open(const char *name, int openmode);
69 int semihost_close(FILEHANDLE fh);
70 int semihost_read(FILEHANDLE fh, unsigned char *buffer, unsigned int length, int mode);
71 int semihost_write(FILEHANDLE fh, const unsigned char *buffer, unsigned int length, int mode);
72 int semihost_ensure(FILEHANDLE fh);
73 long semihost_flen(FILEHANDLE fh);
74 int semihost_seek(FILEHANDLE fh, long position);
75 int semihost_istty(FILEHANDLE fh);
76 
77 int semihost_remove(const char *name);
78 int semihost_rename(const char *old_name, const char *new_name);
79 #endif
80 
81 int semihost_uid(char *uid);
82 int semihost_reset(void);
83 int semihost_vbus(void);
84 int semihost_powerdown(void);
85 int semihost_exit(void);
86 
87 int semihost_connected(void);
88 int semihost_disabledebug(void);
89 
90 #endif
91 
92 #ifdef __cplusplus
93 }
94 #endif
95 
96 #endif
97 
98 
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