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([122.255.60.245]) by smtp.gmail.com with ESMTPSA id y7-20020aa78f27000000b00522c0a75c39sm8259686pfr.196.2022.06.27.21.59.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Jun 2022 21:59:19 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: Luc Michel Subject: [PULL 53/60] semihosting: Create semihost_sys_poll_one Date: Tue, 28 Jun 2022 10:23:56 +0530 Message-Id: <20220628045403.508716-54-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220628045403.508716-1-richard.henderson@linaro.org> References: <20220628045403.508716-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::62d; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x62d.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This will be used for implementing the xtensa select_one system call. Choose "poll" over "select" so that we can reuse Glib's g_poll constants and to avoid struct timeval. Reviewed-by: Luc Michel Signed-off-by: Richard Henderson --- include/semihosting/console.h | 16 ++++++++ include/semihosting/syscalls.h | 3 ++ semihosting/console.c | 19 ++++++++- semihosting/syscalls.c | 70 ++++++++++++++++++++++++++++++++++ 4 files changed, 106 insertions(+), 2 deletions(-) diff --git a/include/semihosting/console.h b/include/semihosting/console.h index 20c31d89d4..61b0cb3a94 100644 --- a/include/semihosting/console.h +++ b/include/semihosting/console.h @@ -53,4 +53,20 @@ int qemu_semihosting_console_write(void *buf, int len); */ int qemu_semihosting_log_out(const char *s, int len); +/* + * qemu_semihosting_console_block_until_ready: + * @cs: CPUState + * + * If no data is available we suspend the CPU and will re-execute the + * instruction when data is available. + */ +void qemu_semihosting_console_block_until_ready(CPUState *cs); + +/** + * qemu_semihosting_console_ready: + * + * Return true if characters are available for read; does not block. + */ +bool qemu_semihosting_console_ready(void); + #endif /* SEMIHOST_CONSOLE_H */ diff --git a/include/semihosting/syscalls.h b/include/semihosting/syscalls.h index 347200cb9f..3a5ec229eb 100644 --- a/include/semihosting/syscalls.h +++ b/include/semihosting/syscalls.h @@ -69,4 +69,7 @@ void semihost_sys_system(CPUState *cs, gdb_syscall_complete_cb complete, void semihost_sys_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete, target_ulong tv_addr, target_ulong tz_addr); +void semihost_sys_poll_one(CPUState *cs, gdb_syscall_complete_cb complete, + int fd, GIOCondition cond, int timeout); + #endif /* SEMIHOSTING_SYSCALLS_H */ diff --git a/semihosting/console.c b/semihosting/console.c index c84ab97ab6..cda7cf1905 100644 --- a/semihosting/console.c +++ b/semihosting/console.c @@ -77,10 +77,17 @@ static void console_read(void *opaque, const uint8_t *buf, int size) c->sleeping_cpus = NULL; } -int qemu_semihosting_console_read(CPUState *cs, void *buf, int len) +bool qemu_semihosting_console_ready(void) +{ + SemihostingConsole *c = &console; + + g_assert(qemu_mutex_iothread_locked()); + return !fifo8_is_empty(&c->fifo); +} + +void qemu_semihosting_console_block_until_ready(CPUState *cs) { SemihostingConsole *c = &console; - int ret = 0; g_assert(qemu_mutex_iothread_locked()); @@ -92,6 +99,14 @@ int qemu_semihosting_console_read(CPUState *cs, void *buf, int len) cpu_loop_exit(cs); /* never returns */ } +} + +int qemu_semihosting_console_read(CPUState *cs, void *buf, int len) +{ + SemihostingConsole *c = &console; + int ret = 0; + + qemu_semihosting_console_block_until_ready(cs); /* Read until buffer full or fifo exhausted. */ do { diff --git a/semihosting/syscalls.c b/semihosting/syscalls.c index 9e499b1751..4847f66c02 100644 --- a/semihosting/syscalls.c +++ b/semihosting/syscalls.c @@ -520,6 +520,21 @@ static void host_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete, unlock_user(p, tv_addr, sizeof(struct gdb_timeval)); } +#ifndef CONFIG_USER_ONLY +static void host_poll_one(CPUState *cs, gdb_syscall_complete_cb complete, + GuestFD *gf, GIOCondition cond, int timeout) +{ + /* + * Since this is only used by xtensa in system mode, and stdio is + * handled through GuestFDConsole, and there are no semihosting + * system calls for sockets and the like, that means this descriptor + * must be a normal file. Normal files never block and are thus + * always ready. + */ + complete(cs, cond & (G_IO_IN | G_IO_OUT), 0); +} +#endif + /* * Static file semihosting syscall implementations. */ @@ -628,6 +643,34 @@ static void console_fstat(CPUState *cs, gdb_syscall_complete_cb complete, complete(cs, ret ? -1 : 0, ret ? -ret : 0); } +#ifndef CONFIG_USER_ONLY +static void console_poll_one(CPUState *cs, gdb_syscall_complete_cb complete, + GuestFD *gf, GIOCondition cond, int timeout) +{ + /* The semihosting console does not support urgent data or errors. */ + cond &= G_IO_IN | G_IO_OUT; + + /* + * Since qemu_semihosting_console_write never blocks, we can + * consider output always ready -- leave G_IO_OUT alone. + * All that remains is to conditionally signal input ready. + * Since output ready causes an immediate return, only block + * for G_IO_IN alone. + * + * TODO: Implement proper timeout. For now, only support + * indefinite wait or immediate poll. + */ + if (cond == G_IO_IN && timeout < 0) { + qemu_semihosting_console_block_until_ready(cs); + /* We returned -- input must be ready. */ + } else if ((cond & G_IO_IN) && !qemu_semihosting_console_ready()) { + cond &= ~G_IO_IN; + } + + complete(cs, cond, 0); +} +#endif + /* * Syscall entry points. */ @@ -906,3 +949,30 @@ void semihost_sys_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete, host_gettimeofday(cs, complete, tv_addr, tz_addr); } } + +#ifndef CONFIG_USER_ONLY +void semihost_sys_poll_one(CPUState *cs, gdb_syscall_complete_cb complete, + int fd, GIOCondition cond, int timeout) +{ + GuestFD *gf = get_guestfd(fd); + + if (!gf) { + complete(cs, G_IO_NVAL, 1); + return; + } + switch (gf->type) { + case GuestFDGDB: + complete(cs, G_IO_NVAL, 1); + break; + case GuestFDHost: + host_poll_one(cs, complete, gf, cond, timeout); + break; + case GuestFDConsole: + console_poll_one(cs, complete, gf, cond, timeout); + break; + case GuestFDStatic: + default: + g_assert_not_reached(); + } +} +#endif -- 2.34.1