File: [local] / prex-old / sys / kern / debug.c (download)
Revision 1.1.1.1 (vendor branch), Tue Jun 3 09:38:46 2008 UTC (16 years, 3 months ago) by nbrk
Branch: MAIN, KOHSUKE
CVS Tags: PREX_0_7_BASE, HEAD Branch point for: PREX_0_8_BASE
Changes since 1.1: +0 -0 lines
Yeah, this is an initial import of Prex, portable real-time microkernel
operating system. I wanna hack it for non-profit but fun, so let it in.
|
/*-
* Copyright (c) 2005-2007, Kohsuke Ohtani
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/
/*
* debug.c - kernel debug services
*/
#include <kernel.h>
#include <task.h>
#include <ipc.h>
#include <thread.h>
#include <device.h>
#include <page.h>
#include <kmem.h>
#include <vm.h>
#include <irq.h>
#ifdef DEBUG
#ifdef printk
#undef printk
#endif
#ifdef panic
#undef panic
#endif
#ifdef CONFIG_DMESG
#define LOG_SIZE 2048 /* size of ring buffer for log */
#define LOG_MASK (LOG_SIZE-1)
static void log_save(char *buf);
static char log_buf[LOG_SIZE]; /* buffer for message log */
static u_long log_start; /* start index of log_buf */
static u_long log_end; /* end index of log_buf */
static u_long log_len; /* length of logged char */
#endif
static char msg_buf[MSGBUFSZ]; /* temporary buffer for message */
static void (*alt_print)(char *); /* alternate print handler */
/*
* Print out the specified string with a variable argument.
*
* An actual output is displayed via the platform specific device by
* diag_print() routine in kernel. As an alternate option, the device
* driver can replace the print routine by using debug_attach().
* All printk() inside the kernel are defined as a macro.
* The printk() macro is compiled only when the debug option is
* enabled (NDEBUG=0).
*/
void
printk(const char *fmt, ...)
{
va_list args;
irq_lock();
va_start(args, fmt);
vsprintf(msg_buf, fmt, args);
#ifdef CONFIG_DMESG
log_save(msg_buf);
#endif
if (alt_print != NULL)
alt_print(msg_buf);
else
diag_print(msg_buf);
va_end(args);
irq_unlock();
}
/*
* Kernel assertion.
*
* assert() is called only when the expression is false in ASSERT()
* macro. ASSERT() macro is compiled only when the debug option is
* enabled.
*/
void
assert(const char *file, int line, const char *exp)
{
irq_lock();
printk("\nAssertion failed: %s line:%d '%s'\n", file, line, exp);
BREAKPOINT();
for (;;)
machine_idle();
/* NOTREACHED */
}
/*
* Kernel panic.
*
* panic() is called for a fatal kernel error. It shows specified
* message, and stops CPU. If the kernel is not debug version,
* panic() macro will reset the system instead of calling this
* routine.
*/
void
panic(const char *fmt, ...)
{
va_list args;
irq_lock();
printk("\nKernel panic: ");
va_start(args, fmt);
vsprintf(msg_buf, fmt, args);
printk(msg_buf);
va_end(args);
printk("\n");
irq_unlock();
BREAKPOINT();
for (;;)
machine_idle();
/* NOTREACHED */
}
#ifdef CONFIG_DMESG
/*
* Save diag message to ring buffer
*/
static void
log_save(char *buf)
{
char *p;
for (p = buf; *p != '\0'; p++) {
log_buf[log_end & LOG_MASK] = *p;
log_end++;
if (log_end - log_start > LOG_SIZE)
log_start = log_end - LOG_SIZE;
if (log_len < LOG_SIZE)
log_len++;
}
/* Store end tag */
log_buf[log_end & LOG_MASK] = -1;
}
#endif
/*
* Return infomation about log
*/
int
log_get(char **buf, size_t *size)
{
#ifdef CONFIG_DMESG
*buf = log_buf;
*size = LOG_SIZE;
return 0;
#else
return -1;
#endif
}
#if defined(CONFIG_DMESG) && defined (CONFIG_KDUMP)
static void
log_dump(void)
{
int i, len;
u_long index;
char c;
index = log_start;
len = log_len;
if (log_len == LOG_SIZE) {
/* Skip first line */
while (log_buf[index & LOG_MASK] != '\n') {
index++;
len--;
}
}
for (i = 0; i < len; i++) {
c = log_buf[index & LOG_MASK];
printk("%c", c);
index++;
}
}
#endif
/*
* Dump system information.
*
* A keyboard driver may call this routine if a user presses
* a predefined "dump" key.
* Since interrupt is locked in this routine, there is no need
* to lock the interrupt/scheduler in each dump function.
*/
int
debug_dump(int item)
{
#ifdef CONFIG_KDUMP
int err = 0;
printk("\n");
irq_lock();
switch (item) {
case DUMP_THREAD:
thread_dump();
break;
case DUMP_TASK:
task_dump();
break;
case DUMP_OBJECT:
object_dump();
break;
case DUMP_TIMER:
timer_dump();
break;
case DUMP_IRQ:
irq_dump();
break;
case DUMP_DEVICE:
device_dump();
break;
case DUMP_VM:
page_dump();
kmem_dump();
vm_dump();
break;
#ifdef CONFIG_DMESG
case DUMP_MSGLOG:
log_dump();
break;
#endif
default:
err = 1;
break;
}
irq_unlock();
return err;
#else
return ENOSYS;
#endif
}
/*
* Attach an alternate print handler.
* A device driver can hook the function to display message.
*/
void
debug_attach(void (*fn)(char *))
{
ASSERT(fn);
alt_print = fn;
}
#else /* !DEBUG */
/*
* Stubs for the release build.
*/
int
debug_dump(int item)
{
return ENOSYS;
}
void
debug_attach(void (*fn)(char *))
{
}
#endif /* !DEBUG */