187 lines
5.1 KiB
C
187 lines
5.1 KiB
C
/*
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* Semihosting configuration
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*
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* Copyright (c) 2015 Imagination Technologies
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* Copyright (c) 2019 Linaro Ltd
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*
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* This controls the configuration of semihosting for all guest
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* targets that support it. Architecture specific handling is handled
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* in target/HW/HW-semi.c
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*
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* Semihosting is sightly strange in that it is also supported by some
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* linux-user targets. However in that use case no configuration of
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* the outputs and command lines is supported.
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*
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* The config module is common to all softmmu targets however as vl.c
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* needs to link against the helpers.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "qemu/osdep.h"
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#include "qemu/option.h"
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#include "qemu/config-file.h"
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#include "qemu/error-report.h"
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#include "semihosting/semihost.h"
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#include "chardev/char.h"
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QemuOptsList qemu_semihosting_config_opts = {
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.name = "semihosting-config",
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.implied_opt_name = "enable",
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.head = QTAILQ_HEAD_INITIALIZER(qemu_semihosting_config_opts.head),
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.desc = {
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{
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.name = "enable",
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.type = QEMU_OPT_BOOL,
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}, {
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.name = "target",
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.type = QEMU_OPT_STRING,
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}, {
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.name = "chardev",
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.type = QEMU_OPT_STRING,
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}, {
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.name = "arg",
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.type = QEMU_OPT_STRING,
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},
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{ /* end of list */ }
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},
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};
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typedef struct SemihostingConfig {
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bool enabled;
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SemihostingTarget target;
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Chardev *chardev;
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const char **argv;
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int argc;
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const char *cmdline; /* concatenated argv */
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} SemihostingConfig;
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static SemihostingConfig semihosting;
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static const char *semihost_chardev;
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bool semihosting_enabled(void)
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{
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return semihosting.enabled;
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}
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SemihostingTarget semihosting_get_target(void)
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{
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return semihosting.target;
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}
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const char *semihosting_get_arg(int i)
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{
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if (i >= semihosting.argc) {
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return NULL;
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}
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return semihosting.argv[i];
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}
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int semihosting_get_argc(void)
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{
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return semihosting.argc;
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}
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const char *semihosting_get_cmdline(void)
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{
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if (semihosting.cmdline == NULL && semihosting.argc > 0) {
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semihosting.cmdline = g_strjoinv(" ", (gchar **)semihosting.argv);
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}
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return semihosting.cmdline;
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}
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static int add_semihosting_arg(void *opaque,
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const char *name, const char *val,
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Error **errp)
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{
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SemihostingConfig *s = opaque;
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if (strcmp(name, "arg") == 0) {
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s->argc++;
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/* one extra element as g_strjoinv() expects NULL-terminated array */
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s->argv = g_realloc(s->argv, (s->argc + 1) * sizeof(void *));
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s->argv[s->argc - 1] = val;
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s->argv[s->argc] = NULL;
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}
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return 0;
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}
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/* Use strings passed via -kernel/-append to initialize semihosting.argv[] */
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void semihosting_arg_fallback(const char *file, const char *cmd)
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{
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char *cmd_token;
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/* argv[0] */
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add_semihosting_arg(&semihosting, "arg", file, NULL);
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/* split -append and initialize argv[1..n] */
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cmd_token = strtok(g_strdup(cmd), " ");
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while (cmd_token) {
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add_semihosting_arg(&semihosting, "arg", cmd_token, NULL);
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cmd_token = strtok(NULL, " ");
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}
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}
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Chardev *semihosting_get_chardev(void)
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{
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return semihosting.chardev;
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}
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void qemu_semihosting_enable(void)
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{
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semihosting.enabled = true;
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semihosting.target = SEMIHOSTING_TARGET_AUTO;
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}
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int qemu_semihosting_config_options(const char *optarg)
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{
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QemuOptsList *opt_list = qemu_find_opts("semihosting-config");
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QemuOpts *opts = qemu_opts_parse_noisily(opt_list, optarg, false);
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semihosting.enabled = true;
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if (opts != NULL) {
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semihosting.enabled = qemu_opt_get_bool(opts, "enable",
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true);
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const char *target = qemu_opt_get(opts, "target");
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/* setup of chardev is deferred until they are initialised */
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semihost_chardev = qemu_opt_get(opts, "chardev");
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if (target != NULL) {
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if (strcmp("native", target) == 0) {
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semihosting.target = SEMIHOSTING_TARGET_NATIVE;
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} else if (strcmp("gdb", target) == 0) {
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semihosting.target = SEMIHOSTING_TARGET_GDB;
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} else if (strcmp("auto", target) == 0) {
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semihosting.target = SEMIHOSTING_TARGET_AUTO;
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} else {
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error_report("unsupported semihosting-config %s",
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optarg);
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return 1;
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}
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} else {
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semihosting.target = SEMIHOSTING_TARGET_AUTO;
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}
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/* Set semihosting argument count and vector */
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qemu_opt_foreach(opts, add_semihosting_arg,
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&semihosting, NULL);
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} else {
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error_report("unsupported semihosting-config %s", optarg);
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return 1;
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}
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return 0;
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}
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void qemu_semihosting_connect_chardevs(void)
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{
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/* We had to defer this until chardevs were created */
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if (semihost_chardev) {
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Chardev *chr = qemu_chr_find(semihost_chardev);
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if (chr == NULL) {
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error_report("semihosting chardev '%s' not found",
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semihost_chardev);
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exit(1);
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}
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semihosting.chardev = chr;
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}
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}
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