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1 1 : /*
2 : * Copyright (c) 2022, Commonwealth Scientific and Industrial Research
3 : * Organisation (CSIRO) ABN 41 687 119 230.
4 : *
5 : * SPDX-License-Identifier: Apache-2.0
6 : *
7 : * Based on the ARM semihosting API from:
8 : * https://github.com/ARM-software/abi-aa/blob/main/semihosting/semihosting.rst
9 : *
10 : * RISC-V semihosting also follows these conventions:
11 : * https://github.com/riscv-non-isa/riscv-semihosting/blob/main/riscv-semihosting.adoc
12 : */
13 :
14 : /**
15 : * @file
16 : *
17 : * @brief public Semihosting APIs based on ARM definitions.
18 : * @defgroup semihost Semihosting APIs
19 : * @ingroup os_services
20 : * @{
21 : */
22 :
23 : #ifndef ZEPHYR_INCLUDE_ARCH_COMMON_SEMIHOST_H_
24 : #define ZEPHYR_INCLUDE_ARCH_COMMON_SEMIHOST_H_
25 :
26 : /** @brief Semihosting instructions */
27 0 : enum semihost_instr {
28 : /*
29 : * File I/O operations
30 : */
31 :
32 : /** Open a file or stream on the host system. */
33 : SEMIHOST_OPEN = 0x01,
34 : /** Check whether a file is associated with a stream/terminal */
35 : SEMIHOST_ISTTY = 0x09,
36 : /** Write to a file or stream. */
37 : SEMIHOST_WRITE = 0x05,
38 : /** Read from a file at the current cursor position. */
39 : SEMIHOST_READ = 0x06,
40 : /** Closes a file on the host which has been opened by SEMIHOST_OPEN. */
41 : SEMIHOST_CLOSE = 0x02,
42 : /** Get the length of a file. */
43 : SEMIHOST_FLEN = 0x0C,
44 : /** Set the file cursor to a given position in a file. */
45 : SEMIHOST_SEEK = 0x0A,
46 : /** Get a temporary absolute file path to create a temporary file. */
47 : SEMIHOST_TMPNAM = 0x0D,
48 : /** Remove a file on the host system. Possibly insecure! */
49 : SEMIHOST_REMOVE = 0x0E,
50 : /** Rename a file on the host system. Possibly insecure! */
51 : SEMIHOST_RENAME = 0x0F,
52 :
53 : /*
54 : * Terminal I/O operations
55 : */
56 :
57 : /** Write one character to the debug terminal. */
58 : SEMIHOST_WRITEC = 0x03,
59 : /** Write a NULL terminated string to the debug terminal. */
60 : SEMIHOST_WRITE0 = 0x04,
61 : /** Read one character from the debug terminal. */
62 : SEMIHOST_READC = 0x07,
63 :
64 : /*
65 : * Time operations
66 : */
67 : SEMIHOST_CLOCK = 0x10,
68 : SEMIHOST_ELAPSED = 0x30,
69 : SEMIHOST_TICKFREQ = 0x31,
70 : SEMIHOST_TIME = 0x11,
71 :
72 : /*
73 : * System/Misc. operations
74 : */
75 :
76 : /** Retrieve the errno variable from semihosting operations. */
77 : SEMIHOST_ERRNO = 0x13,
78 : /** Get commandline parameters for the application to run with */
79 : SEMIHOST_GET_CMDLINE = 0x15,
80 : SEMIHOST_HEAPINFO = 0x16,
81 : SEMIHOST_ISERROR = 0x08,
82 : SEMIHOST_SYSTEM = 0x12
83 : };
84 :
85 : /**
86 : * @brief Modes to open a file with
87 : *
88 : * Behaviour corresponds to equivalent fopen strings.
89 : * i.e. SEMIHOST_OPEN_RB_PLUS == "rb+"
90 : */
91 0 : enum semihost_open_mode {
92 : SEMIHOST_OPEN_R = 0,
93 : SEMIHOST_OPEN_RB = 1,
94 : SEMIHOST_OPEN_R_PLUS = 2,
95 : SEMIHOST_OPEN_RB_PLUS = 3,
96 : SEMIHOST_OPEN_W = 4,
97 : SEMIHOST_OPEN_WB = 5,
98 : SEMIHOST_OPEN_W_PLUS = 6,
99 : SEMIHOST_OPEN_WB_PLUS = 7,
100 : SEMIHOST_OPEN_A = 8,
101 : SEMIHOST_OPEN_AB = 9,
102 : SEMIHOST_OPEN_A_PLUS = 10,
103 : SEMIHOST_OPEN_AB_PLUS = 11,
104 : };
105 :
106 : /**
107 : * @brief Manually execute a semihosting instruction
108 : *
109 : * @param instr instruction code to run
110 : * @param args instruction specific arguments
111 : *
112 : * @return integer return code of instruction
113 : */
114 1 : long semihost_exec(enum semihost_instr instr, void *args);
115 :
116 : /**
117 : * @brief Read a byte from the console
118 : *
119 : * @return char byte read from the console.
120 : */
121 1 : char semihost_poll_in(void);
122 :
123 : /**
124 : * @brief Write a byte to the console
125 : *
126 : * @param c byte to write to console
127 : */
128 1 : void semihost_poll_out(char c);
129 :
130 : /**
131 : * @brief Open a file on the host system
132 : *
133 : * @param path file path to open. Can be absolute or relative to current
134 : * directory of the running process.
135 : * @param mode value from @ref semihost_open_mode.
136 : *
137 : * @retval handle positive handle on success.
138 : * @retval -1 on failure.
139 : */
140 1 : long semihost_open(const char *path, long mode);
141 :
142 : /**
143 : * @brief Close a file
144 : *
145 : * @param fd handle returned by @ref semihost_open.
146 : *
147 : * @retval 0 on success.
148 : * @retval -1 on failure.
149 : */
150 1 : long semihost_close(long fd);
151 :
152 : /**
153 : * @brief Query the size of a file
154 : *
155 : * @param fd handle returned by @ref semihost_open.
156 : *
157 : * @retval positive file size on success.
158 : * @retval -1 on failure.
159 : */
160 1 : long semihost_flen(long fd);
161 :
162 : /**
163 : * @brief Seeks to an absolute position in a file.
164 : *
165 : * @param fd handle returned by @ref semihost_open.
166 : * @param offset offset from the start of the file in bytes.
167 : *
168 : * @retval 0 on success.
169 : * @retval -errno negative error code on failure.
170 : */
171 1 : long semihost_seek(long fd, long offset);
172 :
173 : /**
174 : * @brief Read the contents of a file into a buffer.
175 : *
176 : * @param fd handle returned by @ref semihost_open.
177 : * @param buf buffer to read data into.
178 : * @param len number of bytes to read.
179 : *
180 : * @retval read number of bytes read on success.
181 : * @retval -errno negative error code on failure.
182 : */
183 1 : long semihost_read(long fd, void *buf, long len);
184 :
185 : /**
186 : * @brief Write the contents of a buffer into a file.
187 : *
188 : * @param fd handle returned by @ref semihost_open.
189 : * @param buf buffer to write data from.
190 : * @param len number of bytes to write.
191 : *
192 : * @retval 0 on success.
193 : * @retval -errno negative error code on failure.
194 : */
195 1 : long semihost_write(long fd, const void *buf, long len);
196 :
197 : /**
198 : * @}
199 : */
200 :
201 : #endif /* ZEPHYR_INCLUDE_ARCH_COMMON_SEMIHOST_H_ */
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