2 * Semihosting configuration
4 * Copyright (c) 2015 Imagination Technologies
5 * Copyright (c) 2019 Linaro Ltd
7 * This controls the configuration of semihosting for all guest
8 * targets that support it. Architecture specific handling is handled
9 * in target/HW/HW-semi.c
11 * Semihosting is slightly strange in that it is also supported by some
12 * linux-user targets. However in that use case no configuration of
13 * the outputs and command lines is supported.
15 * The config module is common to all system targets however as vl.c
16 * needs to link against the helpers.
18 * SPDX-License-Identifier: GPL-2.0-or-later
21 #include "qemu/osdep.h"
22 #include "qemu/option.h"
23 #include "qemu/config-file.h"
24 #include "qemu/error-report.h"
25 #include "semihosting/semihost.h"
26 #include "chardev/char.h"
28 QemuOptsList qemu_semihosting_config_opts = {
29 .name = "semihosting-config",
31 .implied_opt_name = "enable",
32 .head = QTAILQ_HEAD_INITIALIZER(qemu_semihosting_config_opts.head),
36 .type = QEMU_OPT_BOOL,
39 .type = QEMU_OPT_BOOL,
42 .type = QEMU_OPT_STRING,
45 .type = QEMU_OPT_STRING,
48 .type = QEMU_OPT_STRING,
54 typedef struct SemihostingConfig {
56 bool userspace_enabled;
57 SemihostingTarget target;
60 const char *cmdline; /* concatenated argv */
63 static SemihostingConfig semihosting;
64 static const char *semihost_chardev;
66 bool semihosting_enabled(bool is_user)
68 return semihosting.enabled && (!is_user || semihosting.userspace_enabled);
71 SemihostingTarget semihosting_get_target(void)
73 return semihosting.target;
76 const char *semihosting_get_arg(int i)
78 if (i >= semihosting.argc) {
81 return semihosting.argv[i];
84 int semihosting_get_argc(void)
86 return semihosting.argc;
89 const char *semihosting_get_cmdline(void)
91 if (semihosting.cmdline == NULL && semihosting.argc > 0) {
92 semihosting.cmdline = g_strjoinv(" ", (gchar **)semihosting.argv);
94 return semihosting.cmdline;
97 static int add_semihosting_arg(void *opaque,
98 const char *name, const char *val,
101 SemihostingConfig *s = opaque;
102 if (strcmp(name, "arg") == 0) {
104 /* one extra element as g_strjoinv() expects NULL-terminated array */
105 s->argv = g_renew(char *, s->argv, s->argc + 1);
106 s->argv[s->argc - 1] = g_strdup(val);
107 s->argv[s->argc] = NULL;
112 /* Use strings passed via -kernel/-append to initialize semihosting.argv[] */
113 void semihosting_arg_fallback(const char *file, const char *cmd)
116 g_autofree char *cmd_dup = g_strdup(cmd);
119 add_semihosting_arg(&semihosting, "arg", file, NULL);
121 /* split -append and initialize argv[1..n] */
122 cmd_token = strtok(cmd_dup, " ");
124 add_semihosting_arg(&semihosting, "arg", cmd_token, NULL);
125 cmd_token = strtok(NULL, " ");
129 void qemu_semihosting_enable(void)
131 semihosting.enabled = true;
132 semihosting.target = SEMIHOSTING_TARGET_AUTO;
135 int qemu_semihosting_config_options(const char *optstr)
137 QemuOptsList *opt_list = qemu_find_opts("semihosting-config");
138 QemuOpts *opts = qemu_opts_parse_noisily(opt_list, optstr, false);
140 semihosting.enabled = true;
143 semihosting.enabled = qemu_opt_get_bool(opts, "enable",
145 semihosting.userspace_enabled = qemu_opt_get_bool(opts, "userspace",
147 const char *target = qemu_opt_get(opts, "target");
148 /* setup of chardev is deferred until they are initialised */
149 semihost_chardev = qemu_opt_get(opts, "chardev");
150 if (target != NULL) {
151 if (strcmp("native", target) == 0) {
152 semihosting.target = SEMIHOSTING_TARGET_NATIVE;
153 } else if (strcmp("gdb", target) == 0) {
154 semihosting.target = SEMIHOSTING_TARGET_GDB;
155 } else if (strcmp("auto", target) == 0) {
156 semihosting.target = SEMIHOSTING_TARGET_AUTO;
158 error_report("unsupported semihosting-config %s",
163 semihosting.target = SEMIHOSTING_TARGET_AUTO;
165 /* Set semihosting argument count and vector */
166 qemu_opt_foreach(opts, add_semihosting_arg,
169 error_report("unsupported semihosting-config %s", optstr);
176 /* We had to defer this until chardevs were created */
177 void qemu_semihosting_chardev_init(void)
181 if (semihost_chardev) {
182 chr = qemu_chr_find(semihost_chardev);
184 error_report("semihosting chardev '%s' not found",
190 qemu_semihosting_console_init(chr);