1 /* 2 * Semihosting configuration 3 * 4 * Copyright (c) 2015 Imagination Technologies 5 * Copyright (c) 2019 Linaro Ltd 6 * 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 10 * 11 * Semihosting is sightly 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. 14 * 15 * The config module is common to all softmmu targets however as vl.c 16 * needs to link against the helpers. 17 * 18 * SPDX-License-Identifier: GPL-2.0-or-later 19 */ 20 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" 27 28 QemuOptsList qemu_semihosting_config_opts = { 29 .name = "semihosting-config", 30 .merge_lists = true, 31 .implied_opt_name = "enable", 32 .head = QTAILQ_HEAD_INITIALIZER(qemu_semihosting_config_opts.head), 33 .desc = { 34 { 35 .name = "enable", 36 .type = QEMU_OPT_BOOL, 37 }, { 38 .name = "target", 39 .type = QEMU_OPT_STRING, 40 }, { 41 .name = "chardev", 42 .type = QEMU_OPT_STRING, 43 }, { 44 .name = "arg", 45 .type = QEMU_OPT_STRING, 46 }, 47 { /* end of list */ } 48 }, 49 }; 50 51 typedef struct SemihostingConfig { 52 bool enabled; 53 SemihostingTarget target; 54 Chardev *chardev; 55 char **argv; 56 int argc; 57 const char *cmdline; /* concatenated argv */ 58 } SemihostingConfig; 59 60 static SemihostingConfig semihosting; 61 static const char *semihost_chardev; 62 63 bool semihosting_enabled(void) 64 { 65 return semihosting.enabled; 66 } 67 68 SemihostingTarget semihosting_get_target(void) 69 { 70 return semihosting.target; 71 } 72 73 const char *semihosting_get_arg(int i) 74 { 75 if (i >= semihosting.argc) { 76 return NULL; 77 } 78 return semihosting.argv[i]; 79 } 80 81 int semihosting_get_argc(void) 82 { 83 return semihosting.argc; 84 } 85 86 const char *semihosting_get_cmdline(void) 87 { 88 if (semihosting.cmdline == NULL && semihosting.argc > 0) { 89 semihosting.cmdline = g_strjoinv(" ", (gchar **)semihosting.argv); 90 } 91 return semihosting.cmdline; 92 } 93 94 static int add_semihosting_arg(void *opaque, 95 const char *name, const char *val, 96 Error **errp) 97 { 98 SemihostingConfig *s = opaque; 99 if (strcmp(name, "arg") == 0) { 100 s->argc++; 101 /* one extra element as g_strjoinv() expects NULL-terminated array */ 102 s->argv = g_renew(char *, s->argv, s->argc + 1); 103 s->argv[s->argc - 1] = g_strdup(val); 104 s->argv[s->argc] = NULL; 105 } 106 return 0; 107 } 108 109 /* Use strings passed via -kernel/-append to initialize semihosting.argv[] */ 110 void semihosting_arg_fallback(const char *file, const char *cmd) 111 { 112 char *cmd_token; 113 114 /* argv[0] */ 115 add_semihosting_arg(&semihosting, "arg", file, NULL); 116 117 /* split -append and initialize argv[1..n] */ 118 cmd_token = strtok(g_strdup(cmd), " "); 119 while (cmd_token) { 120 add_semihosting_arg(&semihosting, "arg", cmd_token, NULL); 121 cmd_token = strtok(NULL, " "); 122 } 123 } 124 125 Chardev *semihosting_get_chardev(void) 126 { 127 return semihosting.chardev; 128 } 129 130 void qemu_semihosting_enable(void) 131 { 132 semihosting.enabled = true; 133 semihosting.target = SEMIHOSTING_TARGET_AUTO; 134 } 135 136 int qemu_semihosting_config_options(const char *optarg) 137 { 138 QemuOptsList *opt_list = qemu_find_opts("semihosting-config"); 139 QemuOpts *opts = qemu_opts_parse_noisily(opt_list, optarg, false); 140 141 semihosting.enabled = true; 142 143 if (opts != NULL) { 144 semihosting.enabled = qemu_opt_get_bool(opts, "enable", 145 true); 146 const char *target = qemu_opt_get(opts, "target"); 147 /* setup of chardev is deferred until they are initialised */ 148 semihost_chardev = qemu_opt_get(opts, "chardev"); 149 if (target != NULL) { 150 if (strcmp("native", target) == 0) { 151 semihosting.target = SEMIHOSTING_TARGET_NATIVE; 152 } else if (strcmp("gdb", target) == 0) { 153 semihosting.target = SEMIHOSTING_TARGET_GDB; 154 } else if (strcmp("auto", target) == 0) { 155 semihosting.target = SEMIHOSTING_TARGET_AUTO; 156 } else { 157 error_report("unsupported semihosting-config %s", 158 optarg); 159 return 1; 160 } 161 } else { 162 semihosting.target = SEMIHOSTING_TARGET_AUTO; 163 } 164 /* Set semihosting argument count and vector */ 165 qemu_opt_foreach(opts, add_semihosting_arg, 166 &semihosting, NULL); 167 } else { 168 error_report("unsupported semihosting-config %s", optarg); 169 return 1; 170 } 171 172 return 0; 173 } 174 175 void qemu_semihosting_connect_chardevs(void) 176 { 177 /* We had to defer this until chardevs were created */ 178 if (semihost_chardev) { 179 Chardev *chr = qemu_chr_find(semihost_chardev); 180 if (chr == NULL) { 181 error_report("semihosting chardev '%s' not found", 182 semihost_chardev); 183 exit(1); 184 } 185 semihosting.chardev = chr; 186 } 187 } 188