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[209.51.188.17]) by mx.google.com with ESMTPS id cb7-20020a05622a1f8700b003a7f5484791si980995qtb.487.2022.12.16.03.23.38 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Fri, 16 Dec 2022 03:23:39 -0800 (PST) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=yuoXVbXZ; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1p68nF-00026p-1w; Fri, 16 Dec 2022 06:22:21 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p68nD-00025t-F8 for qemu-devel@nongnu.org; Fri, 16 Dec 2022 06:22:19 -0500 Received: from mail-wm1-x329.google.com ([2a00:1450:4864:20::329]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1p68n8-000699-F9 for qemu-devel@nongnu.org; Fri, 16 Dec 2022 06:22:19 -0500 Received: by mail-wm1-x329.google.com with SMTP id bi26-20020a05600c3d9a00b003d3404a89faso1230542wmb.1 for ; Fri, 16 Dec 2022 03:22:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=9aKOu7kTGaWQQxuXEdSD36/hlY5mYKHfrE/OifwOH2Q=; b=yuoXVbXZD1mE1JVl1uU54M1DmWZBK6OcXY1Sl3sn8KE+ZXNGBF4Opk2zbUMejiZtTm IAQghPtYodE+UyOV62eOEslZHJ8WxYRFLObJ7ALO+KRCyA7V1ziFcVV/AeYwlRnaoDmu Xp/VOPpXyTNCWxhkkVVqa3C+EHgnFlerdMTSFgX/0gYbVEPaPFhzHi6UKj1zLnyIB4bv KOoZra76Ze7ljr9cbtTa8unOZz4NwkC+k33DzgbUHRLQTrxkufnqSKmOcUjvQaAJoRuL wu37mv5UQzONtxuRSeRVgvs3rXDiLOVlXWNWNSCYZoagwHHA/oLAF/m1DNfZ9J6cvuPo Bh3w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=9aKOu7kTGaWQQxuXEdSD36/hlY5mYKHfrE/OifwOH2Q=; b=zvwCe1kJkGVC34sCVuZ+U8Kirnan83keSg0qj8bBOMkxAJpnw8eg5crAIKTaR12Rlm dsqLZRQnEEqaANuw//byS0YZFqh2irGraTuCqOYnLpzZO4CbDovC57Sb36qe82NkhogV dw2s51P4eQj5ZR6hkK555471JOHlNOVrbbNJjSIoh7HsNmlmRlt058l8Zxmf5qQ4G4X5 0evaPv6tYbKrleX3I4N/qJUAn/ilwZ4HglhtbL5WiD0DIs45JDCM9tsroLoh1UKdS5Qa 7sSmW7geCH9dodfVz6kxR3AuAzWwJ4H33sOMG88+PlgdddNAheFkOt3UWT8fH0sVPE6O eutQ== X-Gm-Message-State: ANoB5pkJ0UPAoWF7JoOOaEd+E2TMjnL1hF6aW1mHYMRAsh1Jc+p2/0k9 wrwVMEBcxuaY1o4T2evO4udSvA== X-Received: by 2002:a05:600c:3b8f:b0:3d2:2830:b8bb with SMTP id n15-20020a05600c3b8f00b003d22830b8bbmr14236813wms.34.1671189732362; Fri, 16 Dec 2022 03:22:12 -0800 (PST) Received: from zen.linaroharston ([185.81.254.11]) by smtp.gmail.com with ESMTPSA id t16-20020a1c7710000000b003c21ba7d7d6sm2194948wmi.44.2022.12.16.03.22.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 16 Dec 2022 03:22:09 -0800 (PST) Received: from zen.lan (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id 261491FFB8; Fri, 16 Dec 2022 11:22:08 +0000 (GMT) From: =?utf-8?q?Alex_Benn=C3=A9e?= To: qemu-devel@nongnu.org Cc: f4bug@amsat.org, mads@ynddal.dk, =?utf-8?q?Alex_Benn=C3=A9e?= , =?utf-8?q?Philippe_M?= =?utf-8?q?athieu-Daud=C3=A9?= , Laurent Vivier Subject: [PATCH v1 09/10] gdbstub: move chunks of user code into own files Date: Fri, 16 Dec 2022 11:22:05 +0000 Message-Id: <20221216112206.3171578-10-alex.bennee@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221216112206.3171578-1-alex.bennee@linaro.org> References: <20221216112206.3171578-1-alex.bennee@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::329; envelope-from=alex.bennee@linaro.org; helo=mail-wm1-x329.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 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+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org The process was pretty similar to the softmmu move except we take the time to split stuff between user.c and user-target.c to avoid as much target specific compilation as possible. We also start to make use of our shiny new header scheme so the user-only helpers can be included without the rest of the exec/gsbstub.h cruft. As before we: - convert some helpers to public gdb_ functions (via internals.h) - splitting some functions into user and softmmu versions Signed-off-by: Alex Bennée Reviewed-by: Fabiano Rosas --- gdbstub/internals.h | 22 +- include/exec/gdbstub.h | 18 -- include/gdbstub/user.h | 29 ++ gdbstub/gdbstub.c | 720 ++--------------------------------------- gdbstub/softmmu.c | 89 +++++ gdbstub/user-target.c | 283 ++++++++++++++++ gdbstub/user.c | 343 ++++++++++++++++++++ linux-user/main.c | 1 + linux-user/signal.c | 2 +- gdbstub/meson.build | 2 + 10 files changed, 793 insertions(+), 716 deletions(-) create mode 100644 gdbstub/user-target.c diff --git a/gdbstub/internals.h b/gdbstub/internals.h index 50eac269c8..4c3b0d7b64 100644 --- a/gdbstub/internals.h +++ b/gdbstub/internals.h @@ -77,9 +77,12 @@ typedef struct GDBState { * Connection helpers for both softmmu and user backends */ void gdb_put_buffer(const uint8_t *buf, int len); +void gdb_put_strbuf(void); int gdb_put_packet(const char *buf); +int gdb_put_packet_binary(const char *buf, int len, bool dump); void gdb_hextomem(GByteArray *mem, const char *buf, int len); void gdb_memtohex(GString *buf, const uint8_t *mem, int len); +void gdb_memtox(GString *buf, const char *mem, int len); void gdb_read_byte(uint8_t ch); /* utility helpers */ @@ -89,6 +92,22 @@ int gdb_get_cpu_index(CPUState *cpu); void gdb_create_default_process(GDBState *s); +/* signal mapping, common for softmmu, specialised for user-mode */ +int gdb_signal_to_target(int sig); +int gdb_target_signal_to_gdb(int sig); + +int gdb_get_char(void); /* user only */ + +/** + * gdb_continue() - handle continue in mode specific way. + */ +void gdb_continue(void); + +/** + * gdb_continue_partial() - handle partial continue in mode specific way. + */ +int gdb_continue_partial(char *newstates); + /* * Command handlers - either softmmu or user only */ @@ -116,7 +135,8 @@ typedef union GdbCmdVariant { #define get_param(p, i) (&g_array_index(p, GdbCmdVariant, i)) void gdb_handle_query_rcmd(GArray *params, void *user_ctx); /* softmmu */ - +void gdb_handle_query_offsets(GArray *params, void *user_ctx); /* user */ +void gdb_handle_query_xfer_auxv(GArray *params, void *user_ctx); /*user */ /* * Break/Watch point support - there is an implementation for softmmu diff --git a/include/exec/gdbstub.h b/include/exec/gdbstub.h index 1636fb3841..d1eb96f807 100644 --- a/include/exec/gdbstub.h +++ b/include/exec/gdbstub.h @@ -104,24 +104,6 @@ void gdb_do_syscallv(gdb_syscall_complete_cb cb, const char *fmt, va_list va); int use_gdb_syscalls(void); #ifdef CONFIG_USER_ONLY -/** - * gdb_handlesig: yield control to gdb - * @cpu: CPU - * @sig: if non-zero, the signal number which caused us to stop - * - * This function yields control to gdb, when a user-mode-only target - * needs to stop execution. If @sig is non-zero, then we will send a - * stop packet to tell gdb that we have stopped because of this signal. - * - * This function will block (handling protocol requests from gdb) - * until gdb tells us to continue target execution. When it does - * return, the return value is a signal to deliver to the target, - * or 0 if no signal should be delivered, ie the signal that caused - * us to stop should be ignored. - */ -int gdb_handlesig(CPUState *, int); -void gdb_signalled(CPUArchState *, int); -void gdbserver_fork(CPUState *); #endif /* Get or set a register. Returns the size of the register. */ diff --git a/include/gdbstub/user.h b/include/gdbstub/user.h index 53baba65ff..d392e510c5 100644 --- a/include/gdbstub/user.h +++ b/include/gdbstub/user.h @@ -9,6 +9,35 @@ #ifndef GDBSTUB_USER_H #define GDBSTUB_USER_H +/** + * gdb_handlesig() - yield control to gdb + * @cpu: CPU + * @sig: if non-zero, the signal number which caused us to stop + * + * This function yields control to gdb, when a user-mode-only target + * needs to stop execution. If @sig is non-zero, then we will send a + * stop packet to tell gdb that we have stopped because of this signal. + * + * This function will block (handling protocol requests from gdb) + * until gdb tells us to continue target execution. When it does + * return, the return value is a signal to deliver to the target, + * or 0 if no signal should be delivered, ie the signal that caused + * us to stop should be ignored. + */ +int gdb_handlesig(CPUState *, int); + +/** + * gdb_signalled() - inform remote gdb of sig exit + * @as: current CPUArchState + * @sig: signal number + */ +void gdb_signalled(CPUArchState *as, int sig); + +/** + * gdbserver_fork() - disable gdb stub for child processes. + * @cs: CPU + */ +void gdbserver_fork(CPUState *cs); #endif /* GDBSTUB_USER_H */ diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c index ec4b6ac4e4..fa68a77066 100644 --- a/gdbstub/gdbstub.c +++ b/gdbstub/gdbstub.c @@ -30,13 +30,12 @@ #include "trace.h" #include "exec/gdbstub.h" #ifdef CONFIG_USER_ONLY -#include "qemu.h" +#include "gdbstub/user.h" #else #include "hw/cpu/cluster.h" #include "hw/boards.h" #endif -#include "qemu/sockets.h" #include "sysemu/hw_accel.h" #include "sysemu/runstate.h" #include "semihosting/semihost.h" @@ -80,223 +79,6 @@ static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr, return cpu_memory_rw_debug(cpu, addr, buf, len, is_write); } -/* - * Return the GDB index for a given vCPU state. - * - * For user mode this is simply the thread id. - */ -#if defined(CONFIG_USER_ONLY) -int gdb_get_cpu_index(CPUState *cpu) -{ - TaskState *ts = (TaskState *) cpu->opaque; - return ts ? ts->ts_tid : -1; -} -#endif - -#ifdef CONFIG_USER_ONLY - -/* Map target signal numbers to GDB protocol signal numbers and vice - * versa. For user emulation's currently supported systems, we can - * assume most signals are defined. - */ - -static int gdb_signal_table[] = { - 0, - TARGET_SIGHUP, - TARGET_SIGINT, - TARGET_SIGQUIT, - TARGET_SIGILL, - TARGET_SIGTRAP, - TARGET_SIGABRT, - -1, /* SIGEMT */ - TARGET_SIGFPE, - TARGET_SIGKILL, - TARGET_SIGBUS, - TARGET_SIGSEGV, - TARGET_SIGSYS, - TARGET_SIGPIPE, - TARGET_SIGALRM, - TARGET_SIGTERM, - TARGET_SIGURG, - TARGET_SIGSTOP, - TARGET_SIGTSTP, - TARGET_SIGCONT, - TARGET_SIGCHLD, - TARGET_SIGTTIN, - TARGET_SIGTTOU, - TARGET_SIGIO, - TARGET_SIGXCPU, - TARGET_SIGXFSZ, - TARGET_SIGVTALRM, - TARGET_SIGPROF, - TARGET_SIGWINCH, - -1, /* SIGLOST */ - TARGET_SIGUSR1, - TARGET_SIGUSR2, -#ifdef TARGET_SIGPWR - TARGET_SIGPWR, -#else - -1, -#endif - -1, /* SIGPOLL */ - -1, - -1, - -1, - -1, - -1, - -1, - -1, - -1, - -1, - -1, - -1, -#ifdef __SIGRTMIN - __SIGRTMIN + 1, - __SIGRTMIN + 2, - __SIGRTMIN + 3, - __SIGRTMIN + 4, - __SIGRTMIN + 5, - __SIGRTMIN + 6, - __SIGRTMIN + 7, - __SIGRTMIN + 8, - __SIGRTMIN + 9, - __SIGRTMIN + 10, - __SIGRTMIN + 11, - __SIGRTMIN + 12, - __SIGRTMIN + 13, - __SIGRTMIN + 14, - __SIGRTMIN + 15, - __SIGRTMIN + 16, - __SIGRTMIN + 17, - __SIGRTMIN + 18, - __SIGRTMIN + 19, - __SIGRTMIN + 20, - __SIGRTMIN + 21, - __SIGRTMIN + 22, - __SIGRTMIN + 23, - __SIGRTMIN + 24, - __SIGRTMIN + 25, - __SIGRTMIN + 26, - __SIGRTMIN + 27, - __SIGRTMIN + 28, - __SIGRTMIN + 29, - __SIGRTMIN + 30, - __SIGRTMIN + 31, - -1, /* SIGCANCEL */ - __SIGRTMIN, - __SIGRTMIN + 32, - __SIGRTMIN + 33, - __SIGRTMIN + 34, - __SIGRTMIN + 35, - __SIGRTMIN + 36, - __SIGRTMIN + 37, - __SIGRTMIN + 38, - __SIGRTMIN + 39, - __SIGRTMIN + 40, - __SIGRTMIN + 41, - __SIGRTMIN + 42, - __SIGRTMIN + 43, - __SIGRTMIN + 44, - __SIGRTMIN + 45, - __SIGRTMIN + 46, - __SIGRTMIN + 47, - __SIGRTMIN + 48, - __SIGRTMIN + 49, - __SIGRTMIN + 50, - __SIGRTMIN + 51, - __SIGRTMIN + 52, - __SIGRTMIN + 53, - __SIGRTMIN + 54, - __SIGRTMIN + 55, - __SIGRTMIN + 56, - __SIGRTMIN + 57, - __SIGRTMIN + 58, - __SIGRTMIN + 59, - __SIGRTMIN + 60, - __SIGRTMIN + 61, - __SIGRTMIN + 62, - __SIGRTMIN + 63, - __SIGRTMIN + 64, - __SIGRTMIN + 65, - __SIGRTMIN + 66, - __SIGRTMIN + 67, - __SIGRTMIN + 68, - __SIGRTMIN + 69, - __SIGRTMIN + 70, - __SIGRTMIN + 71, - __SIGRTMIN + 72, - __SIGRTMIN + 73, - __SIGRTMIN + 74, - __SIGRTMIN + 75, - __SIGRTMIN + 76, - __SIGRTMIN + 77, - __SIGRTMIN + 78, - __SIGRTMIN + 79, - __SIGRTMIN + 80, - __SIGRTMIN + 81, - __SIGRTMIN + 82, - __SIGRTMIN + 83, - __SIGRTMIN + 84, - __SIGRTMIN + 85, - __SIGRTMIN + 86, - __SIGRTMIN + 87, - __SIGRTMIN + 88, - __SIGRTMIN + 89, - __SIGRTMIN + 90, - __SIGRTMIN + 91, - __SIGRTMIN + 92, - __SIGRTMIN + 93, - __SIGRTMIN + 94, - __SIGRTMIN + 95, - -1, /* SIGINFO */ - -1, /* UNKNOWN */ - -1, /* DEFAULT */ - -1, - -1, - -1, - -1, - -1, - -1 -#endif -}; -#else -/* In system mode we only need SIGINT and SIGTRAP; other signals - are not yet supported. */ - -enum { - TARGET_SIGINT = 2, - TARGET_SIGTRAP = 5 -}; - -static int gdb_signal_table[] = { - -1, - -1, - TARGET_SIGINT, - -1, - -1, - TARGET_SIGTRAP -}; -#endif - -#ifdef CONFIG_USER_ONLY -static int target_signal_to_gdb (int sig) -{ - int i; - for (i = 0; i < ARRAY_SIZE (gdb_signal_table); i++) - if (gdb_signal_table[i] == sig) - return i; - return GDB_SIGNAL_UNKNOWN; -} -#endif - -static int gdb_signal_to_target (int sig) -{ - if (sig < ARRAY_SIZE (gdb_signal_table)) - return gdb_signal_table[sig]; - else - return -1; -} - typedef struct GDBRegisterState { int base_reg; int num_regs; @@ -306,14 +88,6 @@ typedef struct GDBRegisterState { struct GDBRegisterState *next; } GDBRegisterState; -#ifdef CONFIG_USER_ONLY -typedef struct GDBConnection { - int fd; - char *socket_path; - int running_state; -} GDBConnection; -#endif - GDBState gdbserver_state; void gdb_init_gdbserver_state(void) @@ -338,43 +112,11 @@ void gdb_init_gdbserver_state(void) * The following is differs depending on USER/SOFTMMU, we just * hid it in the typedef. */ -#ifdef CONFIG_USER_ONLY - gdbserver_state.connection = g_new(GDBConnection, 1); -#else gdbserver_state.connection = gdb_init_connection_data(); -#endif } bool gdb_has_xml; -#ifdef CONFIG_USER_ONLY - -static int get_char(void) -{ - uint8_t ch; - int ret; - - for(;;) { - ret = recv(gdbserver_state.connection->fd, &ch, 1, 0); - if (ret < 0) { - if (errno == ECONNRESET) { - gdbserver_state.connection->fd = -1; - } - if (errno != EINTR) { - return -1; - } - } else if (ret == 0) { - close(gdbserver_state.connection->fd); - gdbserver_state.connection->fd = -1; - return -1; - } else { - break; - } - } - return ch; -} -#endif - /* * Return true if there is a GDB currently connected to the stub * and attached to a CPU @@ -419,104 +161,6 @@ static bool stub_can_reverse(void) #endif } -/* Resume execution. */ -static inline void gdb_continue(void) -{ - -#ifdef CONFIG_USER_ONLY - gdbserver_state.connection->running_state = 1; - trace_gdbstub_op_continue(); -#else - if (!runstate_needs_reset()) { - trace_gdbstub_op_continue(); - vm_start(); - } -#endif -} - -/* - * Resume execution, per CPU actions. For user-mode emulation it's - * equivalent to gdb_continue. - */ -static int gdb_continue_partial(char *newstates) -{ - CPUState *cpu; - int res = 0; -#ifdef CONFIG_USER_ONLY - /* - * This is not exactly accurate, but it's an improvement compared to the - * previous situation, where only one CPU would be single-stepped. - */ - CPU_FOREACH(cpu) { - if (newstates[cpu->cpu_index] == 's') { - trace_gdbstub_op_stepping(cpu->cpu_index); - cpu_single_step(cpu, gdbserver_state.sstep_flags); - } - } - gdbserver_state.connection->running_state = 1; -#else - int flag = 0; - - if (!runstate_needs_reset()) { - bool step_requested = false; - CPU_FOREACH(cpu) { - if (newstates[cpu->cpu_index] == 's') { - step_requested = true; - break; - } - } - - if (vm_prepare_start(step_requested)) { - return 0; - } - - CPU_FOREACH(cpu) { - switch (newstates[cpu->cpu_index]) { - case 0: - case 1: - break; /* nothing to do here */ - case 's': - trace_gdbstub_op_stepping(cpu->cpu_index); - cpu_single_step(cpu, gdbserver_state.sstep_flags); - cpu_resume(cpu); - flag = 1; - break; - case 'c': - trace_gdbstub_op_continue_cpu(cpu->cpu_index); - cpu_resume(cpu); - flag = 1; - break; - default: - res = -1; - break; - } - } - } - if (flag) { - qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true); - } -#endif - return res; -} - -#ifdef CONFIG_USER_ONLY -void gdb_put_buffer(const uint8_t *buf, int len) -{ - int ret; - - while (len > 0) { - ret = send(gdbserver_state.connection->fd, buf, len, 0); - if (ret < 0) { - if (errno != EINTR) - return; - } else { - buf += ret; - len -= ret; - } - } -} -#endif - static inline int fromhex(int v) { if (v >= '0' && v <= '9') @@ -594,7 +238,7 @@ static void hexdump(const char *buf, int len, } /* return -1 if error, 0 if OK */ -static int put_packet_binary(const char *buf, int len, bool dump) +int gdb_put_packet_binary(const char *buf, int len, bool dump) { int csum, i; uint8_t footer[3]; @@ -622,7 +266,7 @@ static int put_packet_binary(const char *buf, int len, bool dump) gdbserver_state.last_packet->len); #ifdef CONFIG_USER_ONLY - i = get_char(); + i = gdb_get_char(); if (i < 0) return -1; if (i == '+') @@ -639,16 +283,16 @@ int gdb_put_packet(const char *buf) { trace_gdbstub_io_reply(buf); - return put_packet_binary(buf, strlen(buf), false); + return gdb_put_packet_binary(buf, strlen(buf), false); } -static void put_strbuf(void) +void gdb_put_strbuf(void) { gdb_put_packet(gdbserver_state.str_buf->str); } /* Encode data using the encoding for 'x' packets. */ -static void memtox(GString *buf, const char *mem, int len) +void gdb_memtox(GString *buf, const char *mem, int len) { char c; @@ -1570,7 +1214,7 @@ static void handle_get_reg(GArray *params, void *user_ctx) } gdb_memtohex(gdbserver_state.str_buf, gdbserver_state.mem_buf->data, reg_size); - put_strbuf(); + gdb_put_strbuf(); } static void handle_write_mem(GArray *params, void *user_ctx) @@ -1626,7 +1270,7 @@ static void handle_read_mem(GArray *params, void *user_ctx) gdb_memtohex(gdbserver_state.str_buf, gdbserver_state.mem_buf->data, gdbserver_state.mem_buf->len); - put_strbuf(); + gdb_put_strbuf(); } static void handle_write_all_regs(GArray *params, void *user_ctx) @@ -1667,7 +1311,7 @@ static void handle_read_all_regs(GArray *params, void *user_ctx) g_assert(len == gdbserver_state.mem_buf->len); gdb_memtohex(gdbserver_state.str_buf, gdbserver_state.mem_buf->data, len); - put_strbuf(); + gdb_put_strbuf(); } static void handle_file_io(GArray *params, void *user_ctx) @@ -1812,7 +1456,7 @@ static void handle_v_attach(GArray *params, void *user_ctx) gdb_append_thread_id(cpu, gdbserver_state.str_buf); g_string_append_c(gdbserver_state.str_buf, ';'); cleanup: - put_strbuf(); + gdb_put_strbuf(); } static void handle_v_kill(GArray *params, void *user_ctx) @@ -1877,7 +1521,7 @@ static void handle_query_qemu_sstepbits(GArray *params, void *user_ctx) SSTEP_NOTIMER); } - put_strbuf(); + gdb_put_strbuf(); } static void handle_set_qemu_sstep(GArray *params, void *user_ctx) @@ -1903,7 +1547,7 @@ static void handle_query_qemu_sstep(GArray *params, void *user_ctx) { g_string_printf(gdbserver_state.str_buf, "0x%x", gdbserver_state.sstep_flags); - put_strbuf(); + gdb_put_strbuf(); } static void handle_query_curr_tid(GArray *params, void *user_ctx) @@ -1920,7 +1564,7 @@ static void handle_query_curr_tid(GArray *params, void *user_ctx) cpu = get_first_cpu_in_process(process); g_string_assign(gdbserver_state.str_buf, "QC"); gdb_append_thread_id(cpu, gdbserver_state.str_buf); - put_strbuf(); + gdb_put_strbuf(); } static void handle_query_threads(GArray *params, void *user_ctx) @@ -1932,7 +1576,7 @@ static void handle_query_threads(GArray *params, void *user_ctx) g_string_assign(gdbserver_state.str_buf, "m"); gdb_append_thread_id(gdbserver_state.query_cpu, gdbserver_state.str_buf); - put_strbuf(); + gdb_put_strbuf(); gdbserver_state.query_cpu = gdb_next_attached_cpu(gdbserver_state.query_cpu); } @@ -1975,25 +1619,8 @@ static void handle_query_thread_extra(GArray *params, void *user_ctx) } trace_gdbstub_op_extra_info(rs->str); gdb_memtohex(gdbserver_state.str_buf, (uint8_t *)rs->str, rs->len); - put_strbuf(); -} - -#ifdef CONFIG_USER_ONLY -static void handle_query_offsets(GArray *params, void *user_ctx) -{ - TaskState *ts; - - ts = gdbserver_state.c_cpu->opaque; - g_string_printf(gdbserver_state.str_buf, - "Text=" TARGET_ABI_FMT_lx - ";Data=" TARGET_ABI_FMT_lx - ";Bss=" TARGET_ABI_FMT_lx, - ts->info->code_offset, - ts->info->data_offset, - ts->info->data_offset); - put_strbuf(); + gdb_put_strbuf(); } -#endif static void handle_query_supported(GArray *params, void *user_ctx) { @@ -2022,7 +1649,7 @@ static void handle_query_supported(GArray *params, void *user_ctx) } g_string_append(gdbserver_state.str_buf, ";vContSupported+;multiprocess+"); - put_strbuf(); + gdb_put_strbuf(); } static void handle_query_xfer_features(GArray *params, void *user_ctx) @@ -2067,63 +1694,16 @@ static void handle_query_xfer_features(GArray *params, void *user_ctx) if (len < total_len - addr) { g_string_assign(gdbserver_state.str_buf, "m"); - memtox(gdbserver_state.str_buf, xml + addr, len); + gdb_memtox(gdbserver_state.str_buf, xml + addr, len); } else { g_string_assign(gdbserver_state.str_buf, "l"); - memtox(gdbserver_state.str_buf, xml + addr, total_len - addr); + gdb_memtox(gdbserver_state.str_buf, xml + addr, total_len - addr); } - put_packet_binary(gdbserver_state.str_buf->str, + gdb_put_packet_binary(gdbserver_state.str_buf->str, gdbserver_state.str_buf->len, true); } -#if defined(CONFIG_USER_ONLY) && defined(CONFIG_LINUX_USER) -static void handle_query_xfer_auxv(GArray *params, void *user_ctx) -{ - TaskState *ts; - unsigned long offset, len, saved_auxv, auxv_len; - - if (params->len < 2) { - gdb_put_packet("E22"); - return; - } - - offset = get_param(params, 0)->val_ul; - len = get_param(params, 1)->val_ul; - ts = gdbserver_state.c_cpu->opaque; - saved_auxv = ts->info->saved_auxv; - auxv_len = ts->info->auxv_len; - - if (offset >= auxv_len) { - gdb_put_packet("E00"); - return; - } - - if (len > (MAX_PACKET_LENGTH - 5) / 2) { - len = (MAX_PACKET_LENGTH - 5) / 2; - } - - if (len < auxv_len - offset) { - g_string_assign(gdbserver_state.str_buf, "m"); - } else { - g_string_assign(gdbserver_state.str_buf, "l"); - len = auxv_len - offset; - } - - g_byte_array_set_size(gdbserver_state.mem_buf, len); - if (target_memory_rw_debug(gdbserver_state.g_cpu, saved_auxv + offset, - gdbserver_state.mem_buf->data, len, false)) { - gdb_put_packet("E14"); - return; - } - - memtox(gdbserver_state.str_buf, - (const char *)gdbserver_state.mem_buf->data, len); - put_packet_binary(gdbserver_state.str_buf->str, - gdbserver_state.str_buf->len, true); -} -#endif - static void handle_query_attached(GArray *params, void *user_ctx) { gdb_put_packet(GDB_ATTACHED); @@ -2135,7 +1715,7 @@ static void handle_query_qemu_supported(GArray *params, void *user_ctx) #ifndef CONFIG_USER_ONLY g_string_append(gdbserver_state.str_buf, ";PhyMemMode"); #endif - put_strbuf(); + gdb_put_strbuf(); } #ifndef CONFIG_USER_ONLY @@ -2143,7 +1723,7 @@ static void handle_query_qemu_phy_mem_mode(GArray *params, void *user_ctx) { g_string_printf(gdbserver_state.str_buf, "%d", phy_memory_mode); - put_strbuf(); + gdb_put_strbuf(); } static void handle_set_qemu_phy_mem_mode(GArray *params, void *user_ctx) @@ -2201,7 +1781,7 @@ static const GdbCmdParseEntry gdb_gen_query_table[] = { }, #ifdef CONFIG_USER_ONLY { - .handler = handle_query_offsets, + .handler = gdb_handle_query_offsets, .cmd = "Offsets", }, #else @@ -2231,7 +1811,7 @@ static const GdbCmdParseEntry gdb_gen_query_table[] = { }, #if defined(CONFIG_USER_ONLY) && defined(CONFIG_LINUX_USER) { - .handler = handle_query_xfer_auxv, + .handler = gdb_handle_query_xfer_auxv, .cmd = "Xfer:auxv:read::", .cmd_startswith = 1, .schema = "l,l0" @@ -2319,7 +1899,7 @@ static void handle_target_halt(GArray *params, void *user_ctx) g_string_printf(gdbserver_state.str_buf, "T%02xthread:", GDB_SIGNAL_TRAP); gdb_append_thread_id(gdbserver_state.c_cpu, gdbserver_state.str_buf); g_string_append_c(gdbserver_state.str_buf, ';'); - put_strbuf(); + gdb_put_strbuf(); /* * Remove all the breakpoints when this query is issued, * because gdb is doing an initial connect and the state @@ -2819,29 +2399,6 @@ void gdb_read_byte(uint8_t ch) } } -#ifdef CONFIG_USER_ONLY -/* Tell the remote gdb that the process has exited. */ -void gdb_exit(int code) -{ - char buf[4]; - - if (!gdbserver_state.init) { - return; - } - if (gdbserver_state.connection->socket_path) { - unlink(gdbserver_state.connection->socket_path); - } - if (gdbserver_state.connection->fd < 0) { - return; - } - - trace_gdbstub_op_exiting((uint8_t)code); - - snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code); - gdb_put_packet(buf); -} -#endif - /* * Create the process that will contain all the "orphan" CPUs (that are not * part of a CPU cluster). Note that if this process contains no CPUs, it won't @@ -2867,232 +2424,3 @@ void gdb_create_default_process(GDBState *s) process->target_xml[0] = '\0'; } -#ifdef CONFIG_USER_ONLY -int -gdb_handlesig(CPUState *cpu, int sig) -{ - char buf[256]; - int n; - - if (!gdbserver_state.init || gdbserver_state.connection->fd < 0) { - return sig; - } - - /* disable single step if it was enabled */ - cpu_single_step(cpu, 0); - tb_flush(cpu); - - if (sig != 0) { - gdb_set_stop_cpu(cpu); - g_string_printf(gdbserver_state.str_buf, - "T%02xthread:", target_signal_to_gdb(sig)); - gdb_append_thread_id(cpu, gdbserver_state.str_buf); - g_string_append_c(gdbserver_state.str_buf, ';'); - put_strbuf(); - } - /* gdb_put_packet() might have detected that the peer terminated the - connection. */ - if (gdbserver_state.connection->fd < 0) { - return sig; - } - - sig = 0; - gdbserver_state.state = RS_IDLE; - gdbserver_state.connection->running_state = 0; - while (gdbserver_state.connection->running_state == 0) { - n = read(gdbserver_state.connection->fd, buf, 256); - if (n > 0) { - int i; - - for (i = 0; i < n; i++) { - gdb_read_byte(buf[i]); - } - } else { - /* XXX: Connection closed. Should probably wait for another - connection before continuing. */ - if (n == 0) { - close(gdbserver_state.connection->fd); - } - gdbserver_state.connection->fd = -1; - return sig; - } - } - sig = gdbserver_state.signal; - gdbserver_state.signal = 0; - return sig; -} - -/* Tell the remote gdb that the process has exited due to SIG. */ -void gdb_signalled(CPUArchState *env, int sig) -{ - char buf[4]; - - if (!gdbserver_state.init || gdbserver_state.connection->fd < 0) { - return; - } - - snprintf(buf, sizeof(buf), "X%02x", target_signal_to_gdb(sig)); - gdb_put_packet(buf); -} - -static void gdb_accept_init(int fd) -{ - gdb_init_gdbserver_state(); - gdb_create_default_process(&gdbserver_state); - gdbserver_state.processes[0].attached = true; - gdbserver_state.c_cpu = gdb_first_attached_cpu(); - gdbserver_state.g_cpu = gdbserver_state.c_cpu; - gdbserver_state.connection->fd = fd; - gdb_has_xml = false; -} - -static bool gdb_accept_socket(int gdb_fd) -{ - int fd; - - for(;;) { - fd = accept(gdb_fd, NULL, NULL); - if (fd < 0 && errno != EINTR) { - perror("accept socket"); - return false; - } else if (fd >= 0) { - qemu_set_cloexec(fd); - break; - } - } - - gdb_accept_init(fd); - return true; -} - -static int gdbserver_open_socket(const char *path) -{ - struct sockaddr_un sockaddr = {}; - int fd, ret; - - fd = socket(AF_UNIX, SOCK_STREAM, 0); - if (fd < 0) { - perror("create socket"); - return -1; - } - - sockaddr.sun_family = AF_UNIX; - pstrcpy(sockaddr.sun_path, sizeof(sockaddr.sun_path) - 1, path); - ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); - if (ret < 0) { - perror("bind socket"); - close(fd); - return -1; - } - ret = listen(fd, 1); - if (ret < 0) { - perror("listen socket"); - close(fd); - return -1; - } - - return fd; -} - -static bool gdb_accept_tcp(int gdb_fd) -{ - struct sockaddr_in sockaddr = {}; - socklen_t len; - int fd; - - for(;;) { - len = sizeof(sockaddr); - fd = accept(gdb_fd, (struct sockaddr *)&sockaddr, &len); - if (fd < 0 && errno != EINTR) { - perror("accept"); - return false; - } else if (fd >= 0) { - qemu_set_cloexec(fd); - break; - } - } - - /* set short latency */ - if (socket_set_nodelay(fd)) { - perror("setsockopt"); - close(fd); - return false; - } - - gdb_accept_init(fd); - return true; -} - -static int gdbserver_open_port(int port) -{ - struct sockaddr_in sockaddr; - int fd, ret; - - fd = socket(PF_INET, SOCK_STREAM, 0); - if (fd < 0) { - perror("socket"); - return -1; - } - qemu_set_cloexec(fd); - - socket_set_fast_reuse(fd); - - sockaddr.sin_family = AF_INET; - sockaddr.sin_port = htons(port); - sockaddr.sin_addr.s_addr = 0; - ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); - if (ret < 0) { - perror("bind"); - close(fd); - return -1; - } - ret = listen(fd, 1); - if (ret < 0) { - perror("listen"); - close(fd); - return -1; - } - - return fd; -} - -int gdbserver_start(const char *port_or_path) -{ - int port = g_ascii_strtoull(port_or_path, NULL, 10); - int gdb_fd; - - if (port > 0) { - gdb_fd = gdbserver_open_port(port); - } else { - gdb_fd = gdbserver_open_socket(port_or_path); - } - - if (gdb_fd < 0) { - return -1; - } - - if (port > 0 && gdb_accept_tcp(gdb_fd)) { - return 0; - } else if (gdb_accept_socket(gdb_fd)) { - gdbserver_state.connection->socket_path = g_strdup(port_or_path); - return 0; - } - - /* gone wrong */ - close(gdb_fd); - return -1; -} - -/* Disable gdb stub for child processes. */ -void gdbserver_fork(CPUState *cpu) -{ - if (!gdbserver_state.init || gdbserver_state.connection->fd < 0) { - return; - } - close(gdbserver_state.connection->fd); - gdbserver_state.connection->fd = -1; - cpu_breakpoint_remove_all(cpu, BP_GDB); - cpu_watchpoint_remove_all(cpu, BP_GDB); -} -#else -#endif diff --git a/gdbstub/softmmu.c b/gdbstub/softmmu.c index b7a335b183..1154a313cb 100644 --- a/gdbstub/softmmu.c +++ b/gdbstub/softmmu.c @@ -432,6 +432,95 @@ void gdb_handle_query_rcmd(GArray *params, void *user_ctx) gdb_put_packet("OK"); } +/* + * Execution state helpers + */ + +void gdb_continue(void) +{ + if (!runstate_needs_reset()) { + trace_gdbstub_op_continue(); + vm_start(); + } +} + +/* + * Resume execution, per CPU actions. + */ +int gdb_continue_partial(char *newstates) +{ + CPUState *cpu; + int res = 0; + int flag = 0; + + if (!runstate_needs_reset()) { + bool step_requested = false; + CPU_FOREACH(cpu) { + if (newstates[cpu->cpu_index] == 's') { + step_requested = true; + break; + } + } + + if (vm_prepare_start(step_requested)) { + return 0; + } + + CPU_FOREACH(cpu) { + switch (newstates[cpu->cpu_index]) { + case 0: + case 1: + break; /* nothing to do here */ + case 's': + trace_gdbstub_op_stepping(cpu->cpu_index); + cpu_single_step(cpu, gdbserver_state.sstep_flags); + cpu_resume(cpu); + flag = 1; + break; + case 'c': + trace_gdbstub_op_continue_cpu(cpu->cpu_index); + cpu_resume(cpu); + flag = 1; + break; + default: + res = -1; + break; + } + } + } + if (flag) { + qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true); + } + return res; +} + +/* + * Signal Handling - in system mode we only need SIGINT and SIGTRAP; other + * signals are not yet supported. + */ + +enum { + TARGET_SIGINT = 2, + TARGET_SIGTRAP = 5 +}; + +static int gdb_signal_table[] = { + -1, + -1, + TARGET_SIGINT, + -1, + -1, + TARGET_SIGTRAP +}; + +int gdb_signal_to_target (int sig) +{ + if (sig < ARRAY_SIZE (gdb_signal_table)) + return gdb_signal_table[sig]; + else + return -1; +} + /* * Break/Watch point helpers */ diff --git a/gdbstub/user-target.c b/gdbstub/user-target.c new file mode 100644 index 0000000000..83e04e1c23 --- /dev/null +++ b/gdbstub/user-target.c @@ -0,0 +1,283 @@ +/* + * Target specific user-mode handling + * + * Copyright (c) 2003-2005 Fabrice Bellard + * Copyright (c) 2022 Linaro Ltd + * + * SPDX-License-Identifier: LGPL-2.0+ + */ + +#include "qemu/osdep.h" +#include "exec/gdbstub.h" +#include "qemu.h" +#include "internals.h" + +extern GDBState gdbserver_state; + +/* + * Map target signal numbers to GDB protocol signal numbers and vice + * versa. For user emulation's currently supported systems, we can + * assume most signals are defined. + */ + +static int gdb_signal_table[] = { + 0, + TARGET_SIGHUP, + TARGET_SIGINT, + TARGET_SIGQUIT, + TARGET_SIGILL, + TARGET_SIGTRAP, + TARGET_SIGABRT, + -1, /* SIGEMT */ + TARGET_SIGFPE, + TARGET_SIGKILL, + TARGET_SIGBUS, + TARGET_SIGSEGV, + TARGET_SIGSYS, + TARGET_SIGPIPE, + TARGET_SIGALRM, + TARGET_SIGTERM, + TARGET_SIGURG, + TARGET_SIGSTOP, + TARGET_SIGTSTP, + TARGET_SIGCONT, + TARGET_SIGCHLD, + TARGET_SIGTTIN, + TARGET_SIGTTOU, + TARGET_SIGIO, + TARGET_SIGXCPU, + TARGET_SIGXFSZ, + TARGET_SIGVTALRM, + TARGET_SIGPROF, + TARGET_SIGWINCH, + -1, /* SIGLOST */ + TARGET_SIGUSR1, + TARGET_SIGUSR2, +#ifdef TARGET_SIGPWR + TARGET_SIGPWR, +#else + -1, +#endif + -1, /* SIGPOLL */ + -1, + -1, + -1, + -1, + -1, + -1, + -1, + -1, + -1, + -1, + -1, +#ifdef __SIGRTMIN + __SIGRTMIN + 1, + __SIGRTMIN + 2, + __SIGRTMIN + 3, + __SIGRTMIN + 4, + __SIGRTMIN + 5, + __SIGRTMIN + 6, + __SIGRTMIN + 7, + __SIGRTMIN + 8, + __SIGRTMIN + 9, + __SIGRTMIN + 10, + __SIGRTMIN + 11, + __SIGRTMIN + 12, + __SIGRTMIN + 13, + __SIGRTMIN + 14, + __SIGRTMIN + 15, + __SIGRTMIN + 16, + __SIGRTMIN + 17, + __SIGRTMIN + 18, + __SIGRTMIN + 19, + __SIGRTMIN + 20, + __SIGRTMIN + 21, + __SIGRTMIN + 22, + __SIGRTMIN + 23, + __SIGRTMIN + 24, + __SIGRTMIN + 25, + __SIGRTMIN + 26, + __SIGRTMIN + 27, + __SIGRTMIN + 28, + __SIGRTMIN + 29, + __SIGRTMIN + 30, + __SIGRTMIN + 31, + -1, /* SIGCANCEL */ + __SIGRTMIN, + __SIGRTMIN + 32, + __SIGRTMIN + 33, + __SIGRTMIN + 34, + __SIGRTMIN + 35, + __SIGRTMIN + 36, + __SIGRTMIN + 37, + __SIGRTMIN + 38, + __SIGRTMIN + 39, + __SIGRTMIN + 40, + __SIGRTMIN + 41, + __SIGRTMIN + 42, + __SIGRTMIN + 43, + __SIGRTMIN + 44, + __SIGRTMIN + 45, + __SIGRTMIN + 46, + __SIGRTMIN + 47, + __SIGRTMIN + 48, + __SIGRTMIN + 49, + __SIGRTMIN + 50, + __SIGRTMIN + 51, + __SIGRTMIN + 52, + __SIGRTMIN + 53, + __SIGRTMIN + 54, + __SIGRTMIN + 55, + __SIGRTMIN + 56, + __SIGRTMIN + 57, + __SIGRTMIN + 58, + __SIGRTMIN + 59, + __SIGRTMIN + 60, + __SIGRTMIN + 61, + __SIGRTMIN + 62, + __SIGRTMIN + 63, + __SIGRTMIN + 64, + __SIGRTMIN + 65, + __SIGRTMIN + 66, + __SIGRTMIN + 67, + __SIGRTMIN + 68, + __SIGRTMIN + 69, + __SIGRTMIN + 70, + __SIGRTMIN + 71, + __SIGRTMIN + 72, + __SIGRTMIN + 73, + __SIGRTMIN + 74, + __SIGRTMIN + 75, + __SIGRTMIN + 76, + __SIGRTMIN + 77, + __SIGRTMIN + 78, + __SIGRTMIN + 79, + __SIGRTMIN + 80, + __SIGRTMIN + 81, + __SIGRTMIN + 82, + __SIGRTMIN + 83, + __SIGRTMIN + 84, + __SIGRTMIN + 85, + __SIGRTMIN + 86, + __SIGRTMIN + 87, + __SIGRTMIN + 88, + __SIGRTMIN + 89, + __SIGRTMIN + 90, + __SIGRTMIN + 91, + __SIGRTMIN + 92, + __SIGRTMIN + 93, + __SIGRTMIN + 94, + __SIGRTMIN + 95, + -1, /* SIGINFO */ + -1, /* UNKNOWN */ + -1, /* DEFAULT */ + -1, + -1, + -1, + -1, + -1, + -1 +#endif +}; + +int gdb_signal_to_target (int sig) +{ + if (sig < ARRAY_SIZE (gdb_signal_table)) + return gdb_signal_table[sig]; + else + return -1; +} + +int gdb_target_signal_to_gdb(int sig) +{ + int i; + for (i = 0; i < ARRAY_SIZE (gdb_signal_table); i++) + if (gdb_signal_table[i] == sig) + return i; + return GDB_SIGNAL_UNKNOWN; +} + +int gdb_get_cpu_index(CPUState *cpu) +{ + TaskState *ts = (TaskState *) cpu->opaque; + return ts ? ts->ts_tid : -1; +} + +/* + * User-mode specific command helpers + */ + +void gdb_handle_query_offsets(GArray *params, void *user_ctx) +{ + TaskState *ts; + + ts = gdbserver_state.c_cpu->opaque; + g_string_printf(gdbserver_state.str_buf, + "Text=" TARGET_ABI_FMT_lx + ";Data=" TARGET_ABI_FMT_lx + ";Bss=" TARGET_ABI_FMT_lx, + ts->info->code_offset, + ts->info->data_offset, + ts->info->data_offset); + gdb_put_strbuf(); +} + +/* Partial user only duplicate of helper in gdbstub.c */ +static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr, + uint8_t *buf, int len, bool is_write) +{ + CPUClass *cc; + cc = CPU_GET_CLASS(cpu); + if (cc->memory_rw_debug) { + return cc->memory_rw_debug(cpu, addr, buf, len, is_write); + } + return cpu_memory_rw_debug(cpu, addr, buf, len, is_write); +} + + +#if defined(CONFIG_LINUX_USER) +void gdb_handle_query_xfer_auxv(GArray *params, void *user_ctx) +{ + TaskState *ts; + unsigned long offset, len, saved_auxv, auxv_len; + + if (params->len < 2) { + gdb_put_packet("E22"); + return; + } + + offset = get_param(params, 0)->val_ul; + len = get_param(params, 1)->val_ul; + ts = gdbserver_state.c_cpu->opaque; + saved_auxv = ts->info->saved_auxv; + auxv_len = ts->info->auxv_len; + + if (offset >= auxv_len) { + gdb_put_packet("E00"); + return; + } + + if (len > (MAX_PACKET_LENGTH - 5) / 2) { + len = (MAX_PACKET_LENGTH - 5) / 2; + } + + if (len < auxv_len - offset) { + g_string_assign(gdbserver_state.str_buf, "m"); + } else { + g_string_assign(gdbserver_state.str_buf, "l"); + len = auxv_len - offset; + } + + g_byte_array_set_size(gdbserver_state.mem_buf, len); + if (target_memory_rw_debug(gdbserver_state.g_cpu, saved_auxv + offset, + gdbserver_state.mem_buf->data, len, false)) { + gdb_put_packet("E14"); + return; + } + + gdb_memtox(gdbserver_state.str_buf, + (const char *)gdbserver_state.mem_buf->data, len); + gdb_put_packet_binary(gdbserver_state.str_buf->str, + gdbserver_state.str_buf->len, true); +} +#endif diff --git a/gdbstub/user.c b/gdbstub/user.c index a5f370bcf9..3492d9b68a 100644 --- a/gdbstub/user.c +++ b/gdbstub/user.c @@ -10,11 +10,354 @@ */ #include "qemu/osdep.h" +#include "qemu/cutils.h" +#include "qemu/sockets.h" #include "exec/hwaddr.h" +#include "exec/tb-flush.h" #include "exec/gdbstub.h" +#include "gdbstub/user.h" #include "hw/core/cpu.h" +#include "trace.h" #include "internals.h" +/* user-mode emulation connection details */ +typedef struct GDBConnection { + int fd; + char *socket_path; + int running_state; +} GDBConnection; + +extern GDBState gdbserver_state; + +GDBConnection *gdb_init_connection_data(void) +{ + return g_new(GDBConnection, 1); +} + +int gdb_get_char(void) +{ + uint8_t ch; + int ret; + + for(;;) { + ret = recv(gdbserver_state.connection->fd, &ch, 1, 0); + if (ret < 0) { + if (errno == ECONNRESET) { + gdbserver_state.connection->fd = -1; + } + if (errno != EINTR) { + return -1; + } + } else if (ret == 0) { + close(gdbserver_state.connection->fd); + gdbserver_state.connection->fd = -1; + return -1; + } else { + break; + } + } + return ch; +} + +void gdb_put_buffer(const uint8_t *buf, int len) +{ + int ret; + + while (len > 0) { + ret = send(gdbserver_state.connection->fd, buf, len, 0); + if (ret < 0) { + if (errno != EINTR) + return; + } else { + buf += ret; + len -= ret; + } + } +} + +/* Tell the remote gdb that the process has exited. */ +void gdb_exit(int code) +{ + char buf[4]; + + if (!gdbserver_state.init) { + return; + } + if (gdbserver_state.connection->socket_path) { + unlink(gdbserver_state.connection->socket_path); + } + if (gdbserver_state.connection->fd < 0) { + return; + } + + trace_gdbstub_op_exiting((uint8_t)code); + + snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code); + gdb_put_packet(buf); +} + +int gdb_handlesig(CPUState *cpu, int sig) +{ + char buf[256]; + int n; + + if (!gdbserver_state.init || gdbserver_state.connection->fd < 0) { + return sig; + } + + /* disable single step if it was enabled */ + cpu_single_step(cpu, 0); + tb_flush(cpu); + + if (sig != 0) { + gdb_set_stop_cpu(cpu); + g_string_printf(gdbserver_state.str_buf, + "T%02xthread:", gdb_target_signal_to_gdb(sig)); + gdb_append_thread_id(cpu, gdbserver_state.str_buf); + g_string_append_c(gdbserver_state.str_buf, ';'); + gdb_put_strbuf(); + } + /* gdb_put_packet() might have detected that the peer terminated the + connection. */ + if (gdbserver_state.connection->fd < 0) { + return sig; + } + + sig = 0; + gdbserver_state.state = RS_IDLE; + gdbserver_state.connection->running_state = 0; + while (gdbserver_state.connection->running_state == 0) { + n = read(gdbserver_state.connection->fd, buf, 256); + if (n > 0) { + int i; + + for (i = 0; i < n; i++) { + gdb_read_byte(buf[i]); + } + } else { + /* XXX: Connection closed. Should probably wait for another + connection before continuing. */ + if (n == 0) { + close(gdbserver_state.connection->fd); + } + gdbserver_state.connection->fd = -1; + return sig; + } + } + sig = gdbserver_state.signal; + gdbserver_state.signal = 0; + return sig; +} + +/* Tell the remote gdb that the process has exited due to SIG. */ +void gdb_signalled(CPUArchState *env, int sig) +{ + char buf[4]; + + if (!gdbserver_state.init || gdbserver_state.connection->fd < 0) { + return; + } + + snprintf(buf, sizeof(buf), "X%02x", gdb_target_signal_to_gdb(sig)); + gdb_put_packet(buf); +} + +static void gdb_accept_init(int fd) +{ + gdb_init_gdbserver_state(); + gdb_create_default_process(&gdbserver_state); + gdbserver_state.processes[0].attached = true; + gdbserver_state.c_cpu = gdb_first_attached_cpu(); + gdbserver_state.g_cpu = gdbserver_state.c_cpu; + gdbserver_state.connection->fd = fd; + gdb_has_xml = false; +} + +static bool gdb_accept_socket(int gdb_fd) +{ + int fd; + + for(;;) { + fd = accept(gdb_fd, NULL, NULL); + if (fd < 0 && errno != EINTR) { + perror("accept socket"); + return false; + } else if (fd >= 0) { + qemu_set_cloexec(fd); + break; + } + } + + gdb_accept_init(fd); + return true; +} + +static int gdbserver_open_socket(const char *path) +{ + struct sockaddr_un sockaddr = {}; + int fd, ret; + + fd = socket(AF_UNIX, SOCK_STREAM, 0); + if (fd < 0) { + perror("create socket"); + return -1; + } + + sockaddr.sun_family = AF_UNIX; + pstrcpy(sockaddr.sun_path, sizeof(sockaddr.sun_path) - 1, path); + ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); + if (ret < 0) { + perror("bind socket"); + close(fd); + return -1; + } + ret = listen(fd, 1); + if (ret < 0) { + perror("listen socket"); + close(fd); + return -1; + } + + return fd; +} + +static bool gdb_accept_tcp(int gdb_fd) +{ + struct sockaddr_in sockaddr = {}; + socklen_t len; + int fd; + + for(;;) { + len = sizeof(sockaddr); + fd = accept(gdb_fd, (struct sockaddr *)&sockaddr, &len); + if (fd < 0 && errno != EINTR) { + perror("accept"); + return false; + } else if (fd >= 0) { + qemu_set_cloexec(fd); + break; + } + } + + /* set short latency */ + if (socket_set_nodelay(fd)) { + perror("setsockopt"); + close(fd); + return false; + } + + gdb_accept_init(fd); + return true; +} + +static int gdbserver_open_port(int port) +{ + struct sockaddr_in sockaddr; + int fd, ret; + + fd = socket(PF_INET, SOCK_STREAM, 0); + if (fd < 0) { + perror("socket"); + return -1; + } + qemu_set_cloexec(fd); + + socket_set_fast_reuse(fd); + + sockaddr.sin_family = AF_INET; + sockaddr.sin_port = htons(port); + sockaddr.sin_addr.s_addr = 0; + ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); + if (ret < 0) { + perror("bind"); + close(fd); + return -1; + } + ret = listen(fd, 1); + if (ret < 0) { + perror("listen"); + close(fd); + return -1; + } + + return fd; +} + +int gdbserver_start(const char *port_or_path) +{ + int port = g_ascii_strtoull(port_or_path, NULL, 10); + int gdb_fd; + + if (port > 0) { + gdb_fd = gdbserver_open_port(port); + } else { + gdb_fd = gdbserver_open_socket(port_or_path); + } + + if (gdb_fd < 0) { + return -1; + } + + if (port > 0 && gdb_accept_tcp(gdb_fd)) { + return 0; + } else if (gdb_accept_socket(gdb_fd)) { + gdbserver_state.connection->socket_path = g_strdup(port_or_path); + return 0; + } + + /* gone wrong */ + close(gdb_fd); + return -1; +} + +/* Disable gdb stub for child processes. */ +void gdbserver_fork(CPUState *cpu) +{ + if (!gdbserver_state.init || gdbserver_state.connection->fd < 0) { + return; + } + close(gdbserver_state.connection->fd); + gdbserver_state.connection->fd = -1; + cpu_breakpoint_remove_all(cpu, BP_GDB); + /* no cpu_watchpoint_remove_all for user-mode */ +} + +/* + * Execution state helpers + */ + +void gdb_continue(void) +{ + gdbserver_state.connection->running_state = 1; + trace_gdbstub_op_continue(); +} + +/* + * Resume execution, for user-mode emulation it's equivalent to + * gdb_continue. + */ +int gdb_continue_partial(char *newstates) +{ + CPUState *cpu; + int res = 0; + /* + * This is not exactly accurate, but it's an improvement compared to the + * previous situation, where only one CPU would be single-stepped. + */ + CPU_FOREACH(cpu) { + if (newstates[cpu->cpu_index] == 's') { + trace_gdbstub_op_stepping(cpu->cpu_index); + cpu_single_step(cpu, gdbserver_state.sstep_flags); + } + } + gdbserver_state.connection->running_state = 1; + return res; +} + +/* + * Break/Watch point helpers + */ + bool gdb_supports_guest_debug(void) { /* user-mode == TCG == supported */ diff --git a/linux-user/main.c b/linux-user/main.c index a17fed045b..68aaf4bd58 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -40,6 +40,7 @@ #include "qemu/plugin.h" #include "exec/exec-all.h" #include "exec/gdbstub.h" +#include "gdbstub/user.h" #include "tcg/tcg.h" #include "qemu/timer.h" #include "qemu/envlist.h" diff --git a/linux-user/signal.c b/linux-user/signal.c index 61c6fa3fcf..84f06043d8 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -18,7 +18,7 @@ */ #include "qemu/osdep.h" #include "qemu/bitops.h" -#include "exec/gdbstub.h" +#include "gdbstub/user.h" #include "hw/core/tcg-cpu-ops.h" #include diff --git a/gdbstub/meson.build b/gdbstub/meson.build index fc895a2c39..a763cf235d 100644 --- a/gdbstub/meson.build +++ b/gdbstub/meson.build @@ -7,3 +7,5 @@ specific_ss.add(files('gdbstub.c')) softmmu_ss.add(files('softmmu.c')) user_ss.add(files('user.c')) +# and BSD? +specific_ss.add(when: 'CONFIG_LINUX_USER', if_true: files('user-target.c'))