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/* This file contains a collection of miscellaneous procedures:
* panic: abort MINIX due to a fatal error
* kputc: buffered putc used by kernel printf
*/
#include "kernel/kernel.h"
#include "arch_proto.h"
#include <minix/syslib.h>
#include <unistd.h>
#include <stdarg.h>
#include <signal.h>
#include <string.h>
#include <minix/sys_config.h>
#define ARE_PANICING 0xDEADC0FF
/*===========================================================================*
* panic *
*===========================================================================*/
void panic(const char *fmt, ...)
{
va_list arg;
/* The system has run aground of a fatal kernel error. Terminate execution. */
if (kinfo.minix_panicing == ARE_PANICING) {
reset();
}
kinfo.minix_panicing = ARE_PANICING;
if (fmt != NULL) {
printf("kernel panic: ");
va_start(arg, fmt);
vprintf(fmt, arg);
va_end(arg);
printf("\n");
}
printf("kernel on CPU %d: ", cpuid);
util_stacktrace();
#if 0
if(get_cpulocal_var(proc_ptr)) {
printf("current process : ");
proc_stacktrace(get_cpulocal_var(proc_ptr));
}
#endif
/* Abort MINIX. */
minix_shutdown(0);
}
/*===========================================================================*
* kputc *
*===========================================================================*/
void kputc(
int c /* character to append */
)
{
/* Accumulate a single character for a kernel message. Send a notification
* to the output drivers if an END_OF_KMESS is encountered.
*/
if (c != END_OF_KMESS) {
int maxblpos = sizeof(kmess.kmess_buf) - 2;
#ifdef DEBUG_SERIAL
if (kinfo.do_serial_debug) {
if(c == '\n')
ser_putc('\r');
ser_putc(c);
}
#endif
kmess.km_buf[kmess.km_next] = c; /* put normal char in buffer */
kmess.kmess_buf[kmess.blpos] = c;
if (kmess.km_size < sizeof(kmess.km_buf))
kmess.km_size += 1;
kmess.km_next = (kmess.km_next + 1) % _KMESS_BUF_SIZE;
if(kmess.blpos == maxblpos) {
memmove(kmess.kmess_buf,
kmess.kmess_buf+1, sizeof(kmess.kmess_buf)-1);
} else kmess.blpos++;
} else if (!(kinfo.minix_panicing || kinfo.do_serial_debug)) {
send_diag_sig();
}
}
/*===========================================================================*
* _exit *
*===========================================================================*/
void _exit(
int e /* error code */
)
{
panic("_exit called from within the kernel, should not happen. (err %i)", e);
}
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