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2068cabd3f
Stop including cpu.h in files that don't need it. Signed-off-by: Thomas Huth <thuth@redhat.com> Message-Id: <20210416171314.2074665-4-thuth@redhat.com> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
179 lines
4.9 KiB
C
179 lines
4.9 KiB
C
/*
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* Semihosting Console Support
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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 provides support for outputting to a semihosting console.
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*
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* While most semihosting implementations support reading and writing
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* to arbitrary file descriptors we treat the console as something
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* specifically for debugging interaction. This means messages can be
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* re-directed to gdb (if currently being used to debug) or even
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* re-directed elsewhere.
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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 "semihosting/semihost.h"
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#include "semihosting/console.h"
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#include "exec/gdbstub.h"
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#include "exec/exec-all.h"
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#include "qemu/log.h"
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#include "chardev/char.h"
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#include "chardev/char-fe.h"
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#include "qemu/main-loop.h"
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#include "qapi/error.h"
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#include "qemu/fifo8.h"
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int qemu_semihosting_log_out(const char *s, int len)
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{
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Chardev *chardev = semihosting_get_chardev();
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if (chardev) {
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return qemu_chr_write_all(chardev, (uint8_t *) s, len);
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} else {
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return write(STDERR_FILENO, s, len);
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}
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}
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/*
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* A re-implementation of lock_user_string that we can use locally
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* instead of relying on softmmu-semi. Hopefully we can deprecate that
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* in time. Copy string until we find a 0 or address error.
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*/
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static GString *copy_user_string(CPUArchState *env, target_ulong addr)
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{
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CPUState *cpu = env_cpu(env);
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GString *s = g_string_sized_new(128);
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uint8_t c;
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do {
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if (cpu_memory_rw_debug(cpu, addr++, &c, 1, 0) == 0) {
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if (c) {
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s = g_string_append_c(s, c);
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}
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} else {
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qemu_log_mask(LOG_GUEST_ERROR,
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"%s: passed inaccessible address " TARGET_FMT_lx,
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__func__, addr);
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break;
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}
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} while (c!=0);
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return s;
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}
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static void semihosting_cb(CPUState *cs, target_ulong ret, target_ulong err)
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{
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if (ret == (target_ulong) -1) {
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qemu_log("%s: gdb console output failed ("TARGET_FMT_ld")",
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__func__, err);
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}
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}
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int qemu_semihosting_console_outs(CPUArchState *env, target_ulong addr)
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{
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GString *s = copy_user_string(env, addr);
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int out = s->len;
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if (use_gdb_syscalls()) {
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gdb_do_syscall(semihosting_cb, "write,2,%x,%x", addr, s->len);
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} else {
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out = qemu_semihosting_log_out(s->str, s->len);
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}
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g_string_free(s, true);
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return out;
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}
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void qemu_semihosting_console_outc(CPUArchState *env, target_ulong addr)
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{
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CPUState *cpu = env_cpu(env);
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uint8_t c;
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if (cpu_memory_rw_debug(cpu, addr, &c, 1, 0) == 0) {
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if (use_gdb_syscalls()) {
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gdb_do_syscall(semihosting_cb, "write,2,%x,%x", addr, 1);
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} else {
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qemu_semihosting_log_out((const char *) &c, 1);
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}
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} else {
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qemu_log_mask(LOG_GUEST_ERROR,
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"%s: passed inaccessible address " TARGET_FMT_lx,
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__func__, addr);
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}
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}
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#define FIFO_SIZE 1024
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/* Access to this structure is protected by the BQL */
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typedef struct SemihostingConsole {
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CharBackend backend;
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GSList *sleeping_cpus;
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bool got;
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Fifo8 fifo;
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} SemihostingConsole;
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static SemihostingConsole console;
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static int console_can_read(void *opaque)
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{
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SemihostingConsole *c = opaque;
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int ret;
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g_assert(qemu_mutex_iothread_locked());
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ret = (int) fifo8_num_free(&c->fifo);
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return ret;
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}
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static void console_wake_up(gpointer data, gpointer user_data)
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{
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CPUState *cs = (CPUState *) data;
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/* cpu_handle_halt won't know we have work so just unbung here */
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cs->halted = 0;
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qemu_cpu_kick(cs);
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}
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static void console_read(void *opaque, const uint8_t *buf, int size)
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{
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SemihostingConsole *c = opaque;
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g_assert(qemu_mutex_iothread_locked());
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while (size-- && !fifo8_is_full(&c->fifo)) {
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fifo8_push(&c->fifo, *buf++);
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}
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g_slist_foreach(c->sleeping_cpus, console_wake_up, NULL);
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c->sleeping_cpus = NULL;
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}
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target_ulong qemu_semihosting_console_inc(CPUArchState *env)
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{
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uint8_t ch;
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SemihostingConsole *c = &console;
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g_assert(qemu_mutex_iothread_locked());
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g_assert(current_cpu);
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if (fifo8_is_empty(&c->fifo)) {
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c->sleeping_cpus = g_slist_prepend(c->sleeping_cpus, current_cpu);
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current_cpu->halted = 1;
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current_cpu->exception_index = EXCP_HALTED;
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cpu_loop_exit(current_cpu);
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/* never returns */
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}
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ch = fifo8_pop(&c->fifo);
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return (target_ulong) ch;
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}
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void qemu_semihosting_console_init(void)
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{
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Chardev *chr = semihosting_get_chardev();
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if (chr) {
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fifo8_create(&console.fifo, FIFO_SIZE);
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qemu_chr_fe_init(&console.backend, chr, &error_abort);
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qemu_chr_fe_set_handlers(&console.backend,
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console_can_read,
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console_read,
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NULL, NULL, &console,
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NULL, true);
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}
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}
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