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/*

 * Copyright (c) 2008 Jiri Svoboda

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup trace

 * @{

 */

/** @file

 */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <syscall.h>

#include <ipc/ipc.h>

#include <fibril.h>

#include <errno.h>

#include <udebug.h>

#include <async.h>

#include <task.h>

// Temporary: service and method names

#include "proto.h"

#include <ipc/services.h>

#include "../../srv/vfs/vfs.h"

#include "../../srv/console/console.h"

#include "syscalls.h"

#include "ipcp.h"

#include "errors.h"

#include "trace.h"

#define THBUF_SIZE 64

unsigned thread_hash_buf[THBUF_SIZE];

unsigned n_threads;

int next_thread_id;

int phoneid;

int abort_trace;

unsigned thash;

volatile int paused;

void thread_trace_start(unsigned thread_hash);

static proto_t *proto_console;

static task_id_t task_id;

/** Combination of events/data to print. */

display_mask_t display_mask;

static int task_connect(task_id_t task_id)

{

	int rc;

	rc = ipc_connect_kbox(task_id);

	if (rc == ENOTSUP) {

		printf("You do not have userspace debugging support "

		    "compiled in the kernel.\n");

		printf("Compile kernel with 'Support for userspace debuggers' "

		    "(CONFIG_UDEBUG) enabled.\n");

		return rc;

	}

	if (rc < 0) {

		printf("Error connecting\n");

		printf("ipc_connect_task(%lld) -> %d ", task_id, rc);

		return rc;

	}

	phoneid = rc;

	rc = udebug_begin(phoneid);

	if (rc < 0) {

		printf("udebug_begin() -> %d\n", rc);

		return rc;

	}

	rc = udebug_set_evmask(phoneid, UDEBUG_EM_ALL);

	if (rc < 0) {

		printf("udebug_set_evmask(0x%x) -> %d\n ", UDEBUG_EM_ALL, rc);

		return rc;

	}

	return 0;

}

static int get_thread_list(void)

{

	int rc;

	size_t tb_copied;

	size_t tb_needed;

	int i;

	rc = udebug_thread_read(phoneid, thread_hash_buf,

		THBUF_SIZE*sizeof(unsigned), &tb_copied, &tb_needed);

	if (rc < 0) {

		printf("udebug_thread_read() -> %d\n", rc);

		return rc;

	}

	n_threads = tb_copied / sizeof(unsigned);

	printf("Threads:");

	for (i = 0; i < n_threads; i++) {

		printf(" [%d] (hash 0x%x)", 1+i, thread_hash_buf[i]);

	}

	printf("\ntotal of %u threads\n", tb_needed/sizeof(unsigned));

	return 0;

}

static void print_sc_retval(int retval, rv_type_t rv_type)

{

	printf (" -> ");

	if (rv_type == RV_INTEGER) {

		printf("%d", retval);

	} else if (rv_type == RV_HASH) {

		printf("0x%08x", retval);

	} else if (rv_type == RV_ERRNO) {

		if (retval >= -15 && retval <= 0) {

			printf("%d %s (%s)", retval,

			    err_desc[retval].name,

			    err_desc[retval].desc);

		} else {

			printf("%d", retval);

		}

	} else if (rv_type == RV_INT_ERRNO) {

		if (retval >= -15 && retval < 0) {

			printf("%d %s (%s)", retval,

			    err_desc[retval].name,

			    err_desc[retval].desc);

		} else {

			printf("%d", retval);

		}

	}

	putchar('\n');

}

static void print_sc_args(unsigned *sc_args, int n)

{

	int i;

	putchar('(');

	if (n > 0) printf("%d", sc_args[0]);

	for (i=1; i<n; i++) {

		printf(", %d", sc_args[i]);

	}

	putchar(')');

}

static void sc_ipc_call_async_fast(unsigned *sc_args, int sc_rc)

{

	ipc_call_t call;

	int phoneid;

	if (sc_rc == IPC_CALLRET_FATAL || sc_rc == IPC_CALLRET_TEMPORARY)

		return;

	phoneid = sc_args[0];

	IPC_SET_METHOD(call, sc_args[1]);

	IPC_SET_ARG1(call, sc_args[2]);

	IPC_SET_ARG2(call, sc_args[3]);

	IPC_SET_ARG3(call, sc_args[4]);

	IPC_SET_ARG4(call, sc_args[5]);

	IPC_SET_ARG5(call, 0);

	ipcp_call_out(phoneid, &call, sc_rc);

}

static void sc_ipc_call_async_slow(unsigned *sc_args, int sc_rc)

{

	ipc_call_t call;

	int rc;

	if (sc_rc == IPC_CALLRET_FATAL || sc_rc == IPC_CALLRET_TEMPORARY)

		return;

	memset(&call, 0, sizeof(call));

	rc = udebug_mem_read(phoneid, &call.args, sc_args[1], sizeof(call.args));

	if (rc >= 0) {

		ipcp_call_out(sc_args[0], &call, sc_rc);

	}

}

static void sc_ipc_call_sync_fast(unsigned *sc_args)

{

	ipc_call_t question, reply;

	int rc;

	int phoneidx;

//	printf("sc_ipc_call_sync_fast()\n");

	phoneidx = sc_args[0];

	IPC_SET_METHOD(question, sc_args[1]);

	IPC_SET_ARG1(question, sc_args[2]);

	IPC_SET_ARG2(question, sc_args[3]);

	IPC_SET_ARG3(question, sc_args[4]);

	IPC_SET_ARG4(question, 0);

	IPC_SET_ARG5(question, 0);

//	printf("memset\n");

	memset(&reply, 0, sizeof(reply));

//	printf("udebug_mem_read(phone=%d, buffer_ptr=%u, src_addr=%d, n=%d\n",

//		phoneid, &reply.args, sc_args[5], sizeof(reply.args));

	rc = udebug_mem_read(phoneid, &reply.args, sc_args[5], sizeof(reply.args));

//	printf("dmr->%d\n", rc);

	if (rc < 0) return;

//	printf("call ipc_call_sync\n");

	ipcp_call_sync(phoneidx, &question, &reply);

}

static void sc_ipc_call_sync_slow(unsigned *sc_args)

{

	ipc_call_t question, reply;

	int rc;

	memset(&question, 0, sizeof(question));

	rc = udebug_mem_read(phoneid, &question.args, sc_args[1], sizeof(question.args));

	printf("dmr->%d\n", rc);

	if (rc < 0) return;

	memset(&reply, 0, sizeof(reply));

	rc = udebug_mem_read(phoneid, &reply.args, sc_args[2], sizeof(reply.args));

	printf("dmr->%d\n", rc);

	if (rc < 0) return;

	ipcp_call_sync(sc_args[0], &question, &reply);

}

static void sc_ipc_wait(unsigned *sc_args, int sc_rc)

{

	ipc_call_t call;

	int rc;

	if (sc_rc == 0) return;

	memset(&call, 0, sizeof(call));

	rc = udebug_mem_read(phoneid, &call, sc_args[0], sizeof(call));

//	printf("udebug_mem_read(phone %d, dest %d, app-mem src %d, size %d -> %d\n",

//		phoneid, (int)&call, sc_args[0], sizeof(call), rc);

	if (rc >= 0) {

		ipcp_call_in(&call, sc_rc);

	}

}

static void event_syscall_b(unsigned thread_id, unsigned thread_hash,  unsigned sc_id, int sc_rc)

{

	unsigned sc_args[6];

	int rc;

	/* Read syscall arguments */

	rc = udebug_args_read(phoneid, thread_hash, sc_args);

	async_serialize_start();

//	printf("[%d] ", thread_id);

	if (rc < 0) {

		printf("error\n");

		async_serialize_end();

		return;

	}

	if ((display_mask & DM_SYSCALL) != 0) {

		/* Print syscall name and arguments */

		printf("%s", syscall_desc[sc_id].name);

		print_sc_args(sc_args, syscall_desc[sc_id].n_args);

	}

	async_serialize_end();

}

static void event_syscall_e(unsigned thread_id, unsigned thread_hash,  unsigned sc_id, int sc_rc)

{

	unsigned sc_args[6];

	int rv_type;

	int rc;

	/* Read syscall arguments */

	rc = udebug_args_read(phoneid, thread_hash, sc_args);

	async_serialize_start();

//	printf("[%d] ", thread_id);

	if (rc < 0) {

		printf("error\n");

		async_serialize_end();

		return;

	}

	if ((display_mask & DM_SYSCALL) != 0) {

		/* Print syscall return value */

		rv_type = syscall_desc[sc_id].rv_type;

		print_sc_retval(sc_rc, rv_type);

	}

	switch (sc_id) {

	case SYS_IPC_CALL_ASYNC_FAST:

		sc_ipc_call_async_fast(sc_args, sc_rc);

		break;

	case SYS_IPC_CALL_ASYNC_SLOW:

		sc_ipc_call_async_slow(sc_args, sc_rc);

		break;

	case SYS_IPC_CALL_SYNC_FAST:

		sc_ipc_call_sync_fast(sc_args);

		break;

	case SYS_IPC_CALL_SYNC_SLOW:

		sc_ipc_call_sync_slow(sc_args);

		break;

	case SYS_IPC_WAIT:

		sc_ipc_wait(sc_args, sc_rc);

		break;

	default:

		break;

	}

	async_serialize_end();

}

static void event_thread_b(unsigned hash)

{

	async_serialize_start();

	printf("New thread, hash 0x%x\n", hash);

	async_serialize_end();

	thread_trace_start(hash);

}

static int trace_loop(void *thread_hash_arg)

{

	int rc;

	unsigned ev_type;

	unsigned thread_hash;

	unsigned thread_id;

	unsigned val0, val1;

	thread_hash = (unsigned)thread_hash_arg;

	thread_id = next_thread_id++;

	printf("Start tracing thread [%d] (hash 0x%x)\n", thread_id, thread_hash);

	while (!abort_trace) {

		/* Run thread until an event occurs */

		rc = udebug_go(phoneid, thread_hash,

		    &ev_type, &val0, &val1);

//		printf("rc = %d, ev_type=%d\n", rc, ev_type);

		if (ev_type == UDEBUG_EVENT_FINISHED) {

			/* Done tracing this thread */

			break;

		}

		if (rc >= 0) {

			switch (ev_type) {

			case UDEBUG_EVENT_SYSCALL_B:

				event_syscall_b(thread_id, thread_hash, val0, (int)val1);

				break;

			case UDEBUG_EVENT_SYSCALL_E:

				event_syscall_e(thread_id, thread_hash, val0, (int)val1);

				break;

			case UDEBUG_EVENT_STOP:

				printf("Stop event\n");

				printf("Waiting for resume\n");

				while (paused) {

					usleep(1000000);

					fibril_yield();

					printf(".");

				}

				printf("Resumed\n");

				break;

			case UDEBUG_EVENT_THREAD_B:

				event_thread_b(val0);

				break;

			case UDEBUG_EVENT_THREAD_E:

				printf("Thread 0x%x exited\n", val0);

				abort_trace = 1;

				break;

			default:

				printf("Unknown event type %d\n", ev_type);

				break;

			}

		}

	}

	printf("Finished tracing thread [%d]\n", thread_id);

	return 0;

}

void thread_trace_start(unsigned thread_hash)

{

	fid_t fid;

	thash = thread_hash;

	fid = fibril_create(trace_loop, (void *)thread_hash);

	if (fid == 0) {

		printf("Warning: Failed creating fibril\n");

	}

	fibril_add_ready(fid);

}

static void trace_active_task(task_id_t task_id)

{

	int i;

	int rc;

	int c;

	rc = task_connect(task_id);

	if (rc < 0) {

		printf("Failed to connect to task %lld\n", task_id);

		return;

	}

	printf("Connected to task %lld\n", task_id);

	ipcp_init();

	/* 

	 * User apps now typically have console on phone 3.

	 * (Phones 1 and 2 are used by the loader).

	 */

	ipcp_connection_set(3, 0, proto_console);

	rc = get_thread_list();

	if (rc < 0) {

		printf("Failed to get thread list (error %d)\n", rc);

		return;

	}

	abort_trace = 0;

	for (i = 0; i < n_threads; i++) {

		thread_trace_start(thread_hash_buf[i]);

	}

	while(1) {

		c = getchar();

		if (c == 'q') break;

		if (c == 'p') {

			paused = 1;

			rc = udebug_stop(phoneid, thash);

			printf("stop -> %d\n", rc);

		}

		if (c == 'r') {

			paused = 0;

		}

	}

	printf("\nTerminate debugging session...\n");

	abort_trace = 1;

	udebug_end(phoneid);

	ipc_hangup(phoneid);

	ipcp_cleanup();

	printf("Done\n");

	return;

}

static void main_init(void)

{

	proto_t *p;

	oper_t *o;

	next_thread_id = 1;

	paused = 0;

	proto_init();

	p = proto_new("vfs");

	o = oper_new("read");

	proto_add_oper(p, VFS_READ, o);

	o = oper_new("write");

	proto_add_oper(p, VFS_WRITE, o);

	o = oper_new("truncate");

	proto_add_oper(p, VFS_TRUNCATE, o);

	o = oper_new("mount");

	proto_add_oper(p, VFS_MOUNT, o);

	o = oper_new("unmount");

	proto_add_oper(p, VFS_UNMOUNT, o);

	proto_register(SERVICE_VFS, p);

	p = proto_new("console");

	o = oper_new("getchar");

	proto_add_oper(p, CONSOLE_GETCHAR, o);

	o = oper_new("putchar");

	proto_add_oper(p, CONSOLE_PUTCHAR, o);

	o = oper_new("clear");

	proto_add_oper(p, CONSOLE_CLEAR, o);

	o = oper_new("goto");

	proto_add_oper(p, CONSOLE_GOTO, o);

	o = oper_new("getsize");

	proto_add_oper(p, CONSOLE_GETSIZE, o);

	o = oper_new("flush");

	proto_add_oper(p, CONSOLE_FLUSH, o);

	o = oper_new("set_style");

	proto_add_oper(p, CONSOLE_SET_STYLE, o);

	o = oper_new("cursor_visibility");

	proto_add_oper(p, CONSOLE_CURSOR_VISIBILITY, o);

	o = oper_new("flush");

	proto_add_oper(p, CONSOLE_FLUSH, o);

	proto_console = p;

	proto_register(SERVICE_CONSOLE, p);

}

static void print_syntax()

{

	printf("Syntax:\n");

	printf("\ttrace [+<events>] <executable> [<arg1> [...]]\n");

	printf("or\ttrace [+<events>] -t <task_id>\n");

	printf("Events: (default is +tp)\n");

	printf("\n");

	printf("\tt ... Thread creation and termination\n");

	printf("\ts ... System calls\n");

	printf("\ti ... Low-level IPC\n");

	printf("\tp ... Protocol level\n");

	printf("\n");

	printf("Examples:\n");

	printf("\ttrace +s /app/tetris\n");

	printf("\ttrace +tsip -t 12\n");

}

static display_mask_t parse_display_mask(char *text)

{

	display_mask_t dm;

	char *c;

	c = text;

	while (*c) {

		switch (*c) {

		case 't': dm = dm | DM_THREAD; break;

		case 's': dm = dm | DM_SYSCALL; break;

		case 'i': dm = dm | DM_IPC; break;

		case 'p': dm = dm | DM_SYSTEM | DM_USER; break;

		default:

			printf("Unexpected event type '%c'\n", *c);

			exit(1);

		}

		++c;

	}

	return dm;

}

static int parse_args(int argc, char *argv[])

{

	char *arg;

	char *err_p;

	task_id = 0;

	--argc; ++argv;

	while (argc > 0) {

		arg = *argv;

		if (arg[0] == '+') {

			display_mask = parse_display_mask(&arg[1]);

		} else if (arg[0] == '-') {

			if (arg[1] == 't') {

				/* Trace an already running task */

				--argc; ++argv;

				task_id = strtol(*argv, &err_p, 10);

				if (*err_p) {

					printf("Task ID syntax error\n");

					print_syntax();

					return -1;

				}

			} else {

				printf("Uknown option '%s'\n", arg[0]);

				print_syntax();

				return -1;

			}

		} else {

			break;

		}

		--argc; ++argv;

	}

	if (task_id != 0) {

		if (argc == 0) return;

		printf("Extra arguments\n");

		print_syntax();

		return -1;

	}

	if (argc < 1) {

		printf("Missing argument\n");

		print_syntax();

		return -1;

	}

	/* Execute the specified command and trace the new task. */

	printf("Spawning '%s' with arguments:\n", *argv);

	{

		char **cp = argv;

		while (*cp) printf("'%s'\n", *cp++);

	}

	task_id = task_spawn(*argv, argv);

	return 0;

}

int main(int argc, char *argv[])

{

	printf("System Call / IPC Tracer\n");

	display_mask = DM_THREAD | DM_SYSTEM | DM_USER;

	if (parse_args(argc, argv) < 0)

		return 1;

	main_init();

	trace_active_task(task_id);

	return 0;

}

/** @}

 */